bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator block driver |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4 | * Copyright (c) 2003 Fabrice Bellard |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
blueswir1 | 3990d09 | 2008-12-05 17:53:21 +0000 | [diff] [blame] | 24 | #include "config-host.h" |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 25 | #include "qemu-common.h" |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 26 | #include "trace.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 27 | #include "block/block_int.h" |
| 28 | #include "block/blockjob.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 29 | #include "qemu/module.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 30 | #include "qapi/qmp/qjson.h" |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 31 | #include "sysemu/block-backend.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 32 | #include "sysemu/sysemu.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 33 | #include "qemu/notify.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 34 | #include "block/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 35 | #include "block/qapi.h" |
Luiz Capitulino | b202381 | 2011-09-21 17:16:47 -0300 | [diff] [blame] | 36 | #include "qmp-commands.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 37 | #include "qemu/timer.h" |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 38 | #include "qapi-event.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 39 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 40 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 41 | #include <sys/types.h> |
| 42 | #include <sys/stat.h> |
| 43 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 44 | #include <sys/queue.h> |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 45 | #ifndef __DragonFly__ |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 46 | #include <sys/disk.h> |
| 47 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 48 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 49 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 50 | #ifdef _WIN32 |
| 51 | #include <windows.h> |
| 52 | #endif |
| 53 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 54 | struct BdrvDirtyBitmap { |
| 55 | HBitmap *bitmap; |
| 56 | QLIST_ENTRY(BdrvDirtyBitmap) list; |
| 57 | }; |
| 58 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 59 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 60 | |
Stefan Hajnoczi | 2a87151 | 2014-07-07 15:15:53 +0200 | [diff] [blame] | 61 | #define COROUTINE_POOL_RESERVATION 64 /* number of coroutines to reserve */ |
| 62 | |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 63 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 64 | static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 66 | BlockCompletionFunc *cb, void *opaque); |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 67 | static BlockAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 68 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 69 | BlockCompletionFunc *cb, void *opaque); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 70 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
| 71 | int64_t sector_num, int nb_sectors, |
| 72 | QEMUIOVector *iov); |
| 73 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
| 74 | int64_t sector_num, int nb_sectors, |
| 75 | QEMUIOVector *iov); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 76 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
| 77 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 78 | BdrvRequestFlags flags); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 79 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
| 80 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 81 | BdrvRequestFlags flags); |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 82 | static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
| 83 | int64_t sector_num, |
| 84 | QEMUIOVector *qiov, |
| 85 | int nb_sectors, |
| 86 | BdrvRequestFlags flags, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 87 | BlockCompletionFunc *cb, |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 88 | void *opaque, |
| 89 | bool is_write); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 90 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 91 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 92 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
bellard | ec530c8 | 2006-04-25 22:36:06 +0000 | [diff] [blame] | 93 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 94 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
| 95 | QTAILQ_HEAD_INITIALIZER(bdrv_states); |
blueswir1 | 7ee930d | 2008-09-17 19:04:14 +0000 | [diff] [blame] | 96 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 97 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 98 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 99 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 100 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 101 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 102 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 103 | /* If non-zero, use only whitelisted block drivers */ |
| 104 | static int use_bdrv_whitelist; |
| 105 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 106 | #ifdef _WIN32 |
| 107 | static int is_windows_drive_prefix(const char *filename) |
| 108 | { |
| 109 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 110 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 111 | filename[1] == ':'); |
| 112 | } |
| 113 | |
| 114 | int is_windows_drive(const char *filename) |
| 115 | { |
| 116 | if (is_windows_drive_prefix(filename) && |
| 117 | filename[2] == '\0') |
| 118 | return 1; |
| 119 | if (strstart(filename, "\\\\.\\", NULL) || |
| 120 | strstart(filename, "//./", NULL)) |
| 121 | return 1; |
| 122 | return 0; |
| 123 | } |
| 124 | #endif |
| 125 | |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 126 | /* throttling disk I/O limits */ |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 127 | void bdrv_set_io_limits(BlockDriverState *bs, |
| 128 | ThrottleConfig *cfg) |
| 129 | { |
| 130 | int i; |
| 131 | |
| 132 | throttle_config(&bs->throttle_state, cfg); |
| 133 | |
| 134 | for (i = 0; i < 2; i++) { |
| 135 | qemu_co_enter_next(&bs->throttled_reqs[i]); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /* this function drain all the throttled IOs */ |
| 140 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) |
| 141 | { |
| 142 | bool drained = false; |
| 143 | bool enabled = bs->io_limits_enabled; |
| 144 | int i; |
| 145 | |
| 146 | bs->io_limits_enabled = false; |
| 147 | |
| 148 | for (i = 0; i < 2; i++) { |
| 149 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { |
| 150 | drained = true; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | bs->io_limits_enabled = enabled; |
| 155 | |
| 156 | return drained; |
| 157 | } |
| 158 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 159 | void bdrv_io_limits_disable(BlockDriverState *bs) |
| 160 | { |
| 161 | bs->io_limits_enabled = false; |
| 162 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 163 | bdrv_start_throttled_reqs(bs); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 164 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 165 | throttle_destroy(&bs->throttle_state); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 166 | } |
| 167 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 168 | static void bdrv_throttle_read_timer_cb(void *opaque) |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 169 | { |
| 170 | BlockDriverState *bs = opaque; |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 171 | qemu_co_enter_next(&bs->throttled_reqs[0]); |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 172 | } |
| 173 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 174 | static void bdrv_throttle_write_timer_cb(void *opaque) |
| 175 | { |
| 176 | BlockDriverState *bs = opaque; |
| 177 | qemu_co_enter_next(&bs->throttled_reqs[1]); |
| 178 | } |
| 179 | |
| 180 | /* should be called before bdrv_set_io_limits if a limit is set */ |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 181 | void bdrv_io_limits_enable(BlockDriverState *bs) |
| 182 | { |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 183 | assert(!bs->io_limits_enabled); |
| 184 | throttle_init(&bs->throttle_state, |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 185 | bdrv_get_aio_context(bs), |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 186 | QEMU_CLOCK_VIRTUAL, |
| 187 | bdrv_throttle_read_timer_cb, |
| 188 | bdrv_throttle_write_timer_cb, |
| 189 | bs); |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 190 | bs->io_limits_enabled = true; |
| 191 | } |
| 192 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 193 | /* This function makes an IO wait if needed |
| 194 | * |
| 195 | * @nb_sectors: the number of sectors of the IO |
| 196 | * @is_write: is the IO a write |
| 197 | */ |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 198 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 199 | unsigned int bytes, |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 200 | bool is_write) |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 201 | { |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 202 | /* does this io must wait */ |
| 203 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 204 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 205 | /* if must wait or any request of this type throttled queue the IO */ |
| 206 | if (must_wait || |
| 207 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { |
| 208 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 209 | } |
| 210 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 211 | /* the IO will be executed, do the accounting */ |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 212 | throttle_account(&bs->throttle_state, is_write, bytes); |
| 213 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 214 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 215 | /* if the next request must wait -> do nothing */ |
| 216 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { |
| 217 | return; |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 218 | } |
| 219 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 220 | /* else queue next request for execution */ |
| 221 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 222 | } |
| 223 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 224 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 225 | { |
| 226 | if (!bs || !bs->drv) { |
| 227 | /* 4k should be on the safe side */ |
| 228 | return 4096; |
| 229 | } |
| 230 | |
| 231 | return bs->bl.opt_mem_alignment; |
| 232 | } |
| 233 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 234 | /* check if the path starts with "<protocol>:" */ |
| 235 | static int path_has_protocol(const char *path) |
| 236 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 237 | const char *p; |
| 238 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 239 | #ifdef _WIN32 |
| 240 | if (is_windows_drive(path) || |
| 241 | is_windows_drive_prefix(path)) { |
| 242 | return 0; |
| 243 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 244 | p = path + strcspn(path, ":/\\"); |
| 245 | #else |
| 246 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 247 | #endif |
| 248 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 249 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 250 | } |
| 251 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 252 | int path_is_absolute(const char *path) |
| 253 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 254 | #ifdef _WIN32 |
| 255 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 256 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 257 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 258 | } |
| 259 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 260 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 261 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 262 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 266 | path to it by considering it is relative to base_path. URL are |
| 267 | supported. */ |
| 268 | void path_combine(char *dest, int dest_size, |
| 269 | const char *base_path, |
| 270 | const char *filename) |
| 271 | { |
| 272 | const char *p, *p1; |
| 273 | int len; |
| 274 | |
| 275 | if (dest_size <= 0) |
| 276 | return; |
| 277 | if (path_is_absolute(filename)) { |
| 278 | pstrcpy(dest, dest_size, filename); |
| 279 | } else { |
| 280 | p = strchr(base_path, ':'); |
| 281 | if (p) |
| 282 | p++; |
| 283 | else |
| 284 | p = base_path; |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 285 | p1 = strrchr(base_path, '/'); |
| 286 | #ifdef _WIN32 |
| 287 | { |
| 288 | const char *p2; |
| 289 | p2 = strrchr(base_path, '\\'); |
| 290 | if (!p1 || p2 > p1) |
| 291 | p1 = p2; |
| 292 | } |
| 293 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 294 | if (p1) |
| 295 | p1++; |
| 296 | else |
| 297 | p1 = base_path; |
| 298 | if (p1 > p) |
| 299 | p = p1; |
| 300 | len = p - base_path; |
| 301 | if (len > dest_size - 1) |
| 302 | len = dest_size - 1; |
| 303 | memcpy(dest, base_path, len); |
| 304 | dest[len] = '\0'; |
| 305 | pstrcat(dest, dest_size, filename); |
| 306 | } |
| 307 | } |
| 308 | |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 309 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
| 310 | { |
| 311 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { |
| 312 | pstrcpy(dest, sz, bs->backing_file); |
| 313 | } else { |
| 314 | path_combine(dest, sz, bs->filename, bs->backing_file); |
| 315 | } |
| 316 | } |
| 317 | |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 318 | void bdrv_register(BlockDriver *bdrv) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 319 | { |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 320 | /* Block drivers without coroutine functions need emulation */ |
| 321 | if (!bdrv->bdrv_co_readv) { |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 322 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
| 323 | bdrv->bdrv_co_writev = bdrv_co_writev_em; |
| 324 | |
Stefan Hajnoczi | f8c35c1 | 2011-10-13 21:09:31 +0100 | [diff] [blame] | 325 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
| 326 | * the block driver lacks aio we need to emulate that too. |
| 327 | */ |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 328 | if (!bdrv->bdrv_aio_readv) { |
| 329 | /* add AIO emulation layer */ |
| 330 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
| 331 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 332 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 333 | } |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 334 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 335 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 336 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 337 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 338 | BlockDriverState *bdrv_new_root(void) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 339 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 340 | BlockDriverState *bs = bdrv_new(); |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 341 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 342 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 343 | return bs; |
| 344 | } |
| 345 | |
| 346 | BlockDriverState *bdrv_new(void) |
| 347 | { |
| 348 | BlockDriverState *bs; |
| 349 | int i; |
| 350 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 351 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 352 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 353 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 354 | QLIST_INIT(&bs->op_blockers[i]); |
| 355 | } |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 356 | bdrv_iostatus_disable(bs); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 357 | notifier_list_init(&bs->close_notifiers); |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 358 | notifier_with_return_list_init(&bs->before_write_notifiers); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 359 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
| 360 | qemu_co_queue_init(&bs->throttled_reqs[1]); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 361 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 362 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 363 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 364 | return bs; |
| 365 | } |
| 366 | |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 367 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
| 368 | { |
| 369 | notifier_list_add(&bs->close_notifiers, notify); |
| 370 | } |
| 371 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 372 | BlockDriver *bdrv_find_format(const char *format_name) |
| 373 | { |
| 374 | BlockDriver *drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 375 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 376 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 377 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 378 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 379 | } |
| 380 | return NULL; |
| 381 | } |
| 382 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 383 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 384 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 385 | static const char *whitelist_rw[] = { |
| 386 | CONFIG_BDRV_RW_WHITELIST |
| 387 | }; |
| 388 | static const char *whitelist_ro[] = { |
| 389 | CONFIG_BDRV_RO_WHITELIST |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 390 | }; |
| 391 | const char **p; |
| 392 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 393 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 394 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 395 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 396 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 397 | for (p = whitelist_rw; *p; p++) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 398 | if (!strcmp(drv->format_name, *p)) { |
| 399 | return 1; |
| 400 | } |
| 401 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 402 | if (read_only) { |
| 403 | for (p = whitelist_ro; *p; p++) { |
| 404 | if (!strcmp(drv->format_name, *p)) { |
| 405 | return 1; |
| 406 | } |
| 407 | } |
| 408 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 409 | return 0; |
| 410 | } |
| 411 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 412 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
| 413 | bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 414 | { |
| 415 | BlockDriver *drv = bdrv_find_format(format_name); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 416 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 417 | } |
| 418 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 419 | typedef struct CreateCo { |
| 420 | BlockDriver *drv; |
| 421 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 422 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 423 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 424 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 425 | } CreateCo; |
| 426 | |
| 427 | static void coroutine_fn bdrv_create_co_entry(void *opaque) |
| 428 | { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 429 | Error *local_err = NULL; |
| 430 | int ret; |
| 431 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 432 | CreateCo *cco = opaque; |
| 433 | assert(cco->drv); |
| 434 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 435 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 436 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 437 | error_propagate(&cco->err, local_err); |
| 438 | } |
| 439 | cco->ret = ret; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 440 | } |
| 441 | |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 442 | int bdrv_create(BlockDriver *drv, const char* filename, |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 443 | QemuOpts *opts, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 444 | { |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 445 | int ret; |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 446 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 447 | Coroutine *co; |
| 448 | CreateCo cco = { |
| 449 | .drv = drv, |
| 450 | .filename = g_strdup(filename), |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 451 | .opts = opts, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 452 | .ret = NOT_DONE, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 453 | .err = NULL, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 454 | }; |
| 455 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 456 | if (!drv->bdrv_create) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 457 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 458 | ret = -ENOTSUP; |
| 459 | goto out; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | if (qemu_in_coroutine()) { |
| 463 | /* Fast-path if already in coroutine context */ |
| 464 | bdrv_create_co_entry(&cco); |
| 465 | } else { |
| 466 | co = qemu_coroutine_create(bdrv_create_co_entry); |
| 467 | qemu_coroutine_enter(co, &cco); |
| 468 | while (cco.ret == NOT_DONE) { |
Paolo Bonzini | b47ec2c | 2014-07-07 15:18:01 +0200 | [diff] [blame] | 469 | aio_poll(qemu_get_aio_context(), true); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 470 | } |
| 471 | } |
| 472 | |
| 473 | ret = cco.ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 474 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 475 | if (cco.err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 476 | error_propagate(errp, cco.err); |
| 477 | } else { |
| 478 | error_setg_errno(errp, -ret, "Could not create image"); |
| 479 | } |
| 480 | } |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 481 | |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 482 | out: |
| 483 | g_free(cco.filename); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 484 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 485 | } |
| 486 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 487 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 488 | { |
| 489 | BlockDriver *drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 490 | Error *local_err = NULL; |
| 491 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 492 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 493 | drv = bdrv_find_protocol(filename, true); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 494 | if (drv == NULL) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 495 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 496 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 497 | } |
| 498 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 499 | ret = bdrv_create(drv, filename, opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 500 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 501 | error_propagate(errp, local_err); |
| 502 | } |
| 503 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 504 | } |
| 505 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 506 | void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 507 | { |
| 508 | BlockDriver *drv = bs->drv; |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 509 | Error *local_err = NULL; |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 510 | |
| 511 | memset(&bs->bl, 0, sizeof(bs->bl)); |
| 512 | |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 513 | if (!drv) { |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 514 | return; |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | /* Take some limits from the children as a default */ |
| 518 | if (bs->file) { |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 519 | bdrv_refresh_limits(bs->file, &local_err); |
| 520 | if (local_err) { |
| 521 | error_propagate(errp, local_err); |
| 522 | return; |
| 523 | } |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 524 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 525 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
| 526 | } else { |
| 527 | bs->bl.opt_mem_alignment = 512; |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | if (bs->backing_hd) { |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 531 | bdrv_refresh_limits(bs->backing_hd, &local_err); |
| 532 | if (local_err) { |
| 533 | error_propagate(errp, local_err); |
| 534 | return; |
| 535 | } |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 536 | bs->bl.opt_transfer_length = |
| 537 | MAX(bs->bl.opt_transfer_length, |
| 538 | bs->backing_hd->bl.opt_transfer_length); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 539 | bs->bl.opt_mem_alignment = |
| 540 | MAX(bs->bl.opt_mem_alignment, |
| 541 | bs->backing_hd->bl.opt_mem_alignment); |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | /* Then let the driver override it */ |
| 545 | if (drv->bdrv_refresh_limits) { |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 546 | drv->bdrv_refresh_limits(bs, errp); |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 547 | } |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 548 | } |
| 549 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 550 | /* |
| 551 | * Create a uniquely-named empty temporary file. |
| 552 | * Return 0 upon success, otherwise a negative errno value. |
| 553 | */ |
| 554 | int get_tmp_filename(char *filename, int size) |
| 555 | { |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 556 | #ifdef _WIN32 |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 557 | char temp_dir[MAX_PATH]; |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 558 | /* GetTempFileName requires that its output buffer (4th param) |
| 559 | have length MAX_PATH or greater. */ |
| 560 | assert(size >= MAX_PATH); |
| 561 | return (GetTempPath(MAX_PATH, temp_dir) |
| 562 | && GetTempFileName(temp_dir, "qem", 0, filename) |
| 563 | ? 0 : -GetLastError()); |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 564 | #else |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 565 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 566 | const char *tmpdir; |
aurel32 | 0badc1e | 2008-03-10 00:05:34 +0000 | [diff] [blame] | 567 | tmpdir = getenv("TMPDIR"); |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 568 | if (!tmpdir) { |
| 569 | tmpdir = "/var/tmp"; |
| 570 | } |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 571 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
| 572 | return -EOVERFLOW; |
| 573 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 574 | fd = mkstemp(filename); |
Dunrong Huang | fe235a0 | 2012-09-05 21:26:22 +0800 | [diff] [blame] | 575 | if (fd < 0) { |
| 576 | return -errno; |
| 577 | } |
| 578 | if (close(fd) != 0) { |
| 579 | unlink(filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 580 | return -errno; |
| 581 | } |
| 582 | return 0; |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 583 | #endif |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 584 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 585 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 586 | /* |
| 587 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 588 | * recognized as a host CDROM. |
| 589 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 590 | static BlockDriver *find_hdev_driver(const char *filename) |
| 591 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 592 | int score_max = 0, score; |
| 593 | BlockDriver *drv = NULL, *d; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 594 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 595 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 596 | if (d->bdrv_probe_device) { |
| 597 | score = d->bdrv_probe_device(filename); |
| 598 | if (score > score_max) { |
| 599 | score_max = score; |
| 600 | drv = d; |
| 601 | } |
| 602 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 603 | } |
| 604 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 605 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 606 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 607 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 608 | BlockDriver *bdrv_find_protocol(const char *filename, |
| 609 | bool allow_protocol_prefix) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 610 | { |
| 611 | BlockDriver *drv1; |
| 612 | char protocol[128]; |
| 613 | int len; |
| 614 | const char *p; |
| 615 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 616 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 617 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 618 | /* |
| 619 | * XXX(hch): we really should not let host device detection |
| 620 | * override an explicit protocol specification, but moving this |
| 621 | * later breaks access to device names with colons in them. |
| 622 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 623 | * based Linux systems those actually are quite common. |
| 624 | */ |
| 625 | drv1 = find_hdev_driver(filename); |
| 626 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 627 | return drv1; |
| 628 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 629 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 630 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 631 | return bdrv_find_format("file"); |
| 632 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 633 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 634 | p = strchr(filename, ':'); |
| 635 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 636 | len = p - filename; |
| 637 | if (len > sizeof(protocol) - 1) |
| 638 | len = sizeof(protocol) - 1; |
| 639 | memcpy(protocol, filename, len); |
| 640 | protocol[len] = '\0'; |
| 641 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 642 | if (drv1->protocol_name && |
| 643 | !strcmp(drv1->protocol_name, protocol)) { |
| 644 | return drv1; |
| 645 | } |
| 646 | } |
| 647 | return NULL; |
| 648 | } |
| 649 | |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 650 | static int find_image_format(BlockDriverState *bs, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 651 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 652 | { |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 653 | int score, score_max; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 654 | BlockDriver *drv1, *drv; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 655 | uint8_t buf[2048]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 656 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 657 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 658 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Paolo Bonzini | 8e89559 | 2013-01-10 15:39:27 +0100 | [diff] [blame] | 659 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 660 | drv = bdrv_find_format("raw"); |
| 661 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 662 | error_setg(errp, "Could not find raw image format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 663 | ret = -ENOENT; |
| 664 | } |
| 665 | *pdrv = drv; |
| 666 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 667 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 668 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 669 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 670 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 671 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 672 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 673 | *pdrv = NULL; |
| 674 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 675 | } |
| 676 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 677 | score_max = 0; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 678 | drv = NULL; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 679 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 680 | if (drv1->bdrv_probe) { |
| 681 | score = drv1->bdrv_probe(buf, ret, filename); |
| 682 | if (score > score_max) { |
| 683 | score_max = score; |
| 684 | drv = drv1; |
| 685 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 686 | } |
| 687 | } |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 688 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 689 | error_setg(errp, "Could not determine image format: No compatible " |
| 690 | "driver found"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 691 | ret = -ENOENT; |
| 692 | } |
| 693 | *pdrv = drv; |
| 694 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 695 | } |
| 696 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 697 | /** |
| 698 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 699 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 700 | */ |
| 701 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 702 | { |
| 703 | BlockDriver *drv = bs->drv; |
| 704 | |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 705 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
| 706 | if (bs->sg) |
| 707 | return 0; |
| 708 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 709 | /* query actual device if possible, otherwise just trust the hint */ |
| 710 | if (drv->bdrv_getlength) { |
| 711 | int64_t length = drv->bdrv_getlength(bs); |
| 712 | if (length < 0) { |
| 713 | return length; |
| 714 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 715 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | bs->total_sectors = hint; |
| 719 | return 0; |
| 720 | } |
| 721 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 722 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 723 | * Set open flags for a given discard mode |
| 724 | * |
| 725 | * Return 0 on success, -1 if the discard mode was invalid. |
| 726 | */ |
| 727 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 728 | { |
| 729 | *flags &= ~BDRV_O_UNMAP; |
| 730 | |
| 731 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 732 | /* do nothing */ |
| 733 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 734 | *flags |= BDRV_O_UNMAP; |
| 735 | } else { |
| 736 | return -1; |
| 737 | } |
| 738 | |
| 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 743 | * Set open flags for a given cache mode |
| 744 | * |
| 745 | * Return 0 on success, -1 if the cache mode was invalid. |
| 746 | */ |
| 747 | int bdrv_parse_cache_flags(const char *mode, int *flags) |
| 748 | { |
| 749 | *flags &= ~BDRV_O_CACHE_MASK; |
| 750 | |
| 751 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
| 752 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 753 | } else if (!strcmp(mode, "directsync")) { |
| 754 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 755 | } else if (!strcmp(mode, "writeback")) { |
| 756 | *flags |= BDRV_O_CACHE_WB; |
| 757 | } else if (!strcmp(mode, "unsafe")) { |
| 758 | *flags |= BDRV_O_CACHE_WB; |
| 759 | *flags |= BDRV_O_NO_FLUSH; |
| 760 | } else if (!strcmp(mode, "writethrough")) { |
| 761 | /* this is the default */ |
| 762 | } else { |
| 763 | return -1; |
| 764 | } |
| 765 | |
| 766 | return 0; |
| 767 | } |
| 768 | |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 769 | /** |
| 770 | * The copy-on-read flag is actually a reference count so multiple users may |
| 771 | * use the feature without worrying about clobbering its previous state. |
| 772 | * Copy-on-read stays enabled until all users have called to disable it. |
| 773 | */ |
| 774 | void bdrv_enable_copy_on_read(BlockDriverState *bs) |
| 775 | { |
| 776 | bs->copy_on_read++; |
| 777 | } |
| 778 | |
| 779 | void bdrv_disable_copy_on_read(BlockDriverState *bs) |
| 780 | { |
| 781 | assert(bs->copy_on_read > 0); |
| 782 | bs->copy_on_read--; |
| 783 | } |
| 784 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 785 | /* |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 786 | * Returns the flags that a temporary snapshot should get, based on the |
| 787 | * originally requested flags (the originally requested image will have flags |
| 788 | * like a backing file) |
| 789 | */ |
| 790 | static int bdrv_temp_snapshot_flags(int flags) |
| 791 | { |
| 792 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 793 | } |
| 794 | |
| 795 | /* |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 796 | * Returns the flags that bs->file should get, based on the given flags for |
| 797 | * the parent BDS |
| 798 | */ |
| 799 | static int bdrv_inherited_flags(int flags) |
| 800 | { |
| 801 | /* Enable protocol handling, disable format probing for bs->file */ |
| 802 | flags |= BDRV_O_PROTOCOL; |
| 803 | |
| 804 | /* Our block drivers take care to send flushes and respect unmap policy, |
| 805 | * so we can enable both unconditionally on lower layers. */ |
| 806 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; |
| 807 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 808 | /* Clear flags that only apply to the top layer */ |
Kevin Wolf | 5669b44 | 2014-04-11 21:36:45 +0200 | [diff] [blame] | 809 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 810 | |
| 811 | return flags; |
| 812 | } |
| 813 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 814 | /* |
| 815 | * Returns the flags that bs->backing_hd should get, based on the given flags |
| 816 | * for the parent BDS |
| 817 | */ |
| 818 | static int bdrv_backing_flags(int flags) |
| 819 | { |
| 820 | /* backing files always opened read-only */ |
| 821 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); |
| 822 | |
| 823 | /* snapshot=on is handled on the top layer */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 824 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 825 | |
| 826 | return flags; |
| 827 | } |
| 828 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 829 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 830 | { |
| 831 | int open_flags = flags | BDRV_O_CACHE_WB; |
| 832 | |
| 833 | /* |
| 834 | * Clear flags that are internal to the block layer before opening the |
| 835 | * image. |
| 836 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 837 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 838 | |
| 839 | /* |
| 840 | * Snapshots should be writable. |
| 841 | */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 842 | if (flags & BDRV_O_TEMPORARY) { |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 843 | open_flags |= BDRV_O_RDWR; |
| 844 | } |
| 845 | |
| 846 | return open_flags; |
| 847 | } |
| 848 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 849 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 850 | const char *node_name, |
| 851 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 852 | { |
| 853 | if (!node_name) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 854 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 855 | } |
| 856 | |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 857 | /* Check for empty string or invalid characters */ |
Markus Armbruster | f5bebbb | 2014-09-30 13:59:30 +0200 | [diff] [blame] | 858 | if (!id_wellformed(node_name)) { |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 859 | error_setg(errp, "Invalid node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 860 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 861 | } |
| 862 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 863 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 864 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 865 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 866 | node_name); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 867 | return; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 868 | } |
| 869 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 870 | /* takes care of avoiding duplicates node names */ |
| 871 | if (bdrv_find_node(node_name)) { |
| 872 | error_setg(errp, "Duplicate node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 873 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | /* copy node name into the bs and insert it into the graph list */ |
| 877 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 878 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 879 | } |
| 880 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 881 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 882 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 883 | * |
| 884 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 885 | */ |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 886 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 887 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 888 | { |
| 889 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 890 | const char *filename; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 891 | const char *node_name = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 892 | Error *local_err = NULL; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 893 | |
| 894 | assert(drv != NULL); |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 895 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 896 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 897 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 898 | if (file != NULL) { |
| 899 | filename = file->filename; |
| 900 | } else { |
| 901 | filename = qdict_get_try_str(options, "filename"); |
| 902 | } |
| 903 | |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 904 | if (drv->bdrv_needs_filename && !filename) { |
| 905 | error_setg(errp, "The '%s' block driver requires a file name", |
| 906 | drv->format_name); |
| 907 | return -EINVAL; |
| 908 | } |
| 909 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 910 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
Stefan Hajnoczi | 28dcee1 | 2011-09-22 20:14:12 +0100 | [diff] [blame] | 911 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 912 | node_name = qdict_get_try_str(options, "node-name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 913 | bdrv_assign_node_name(bs, node_name, &local_err); |
Markus Armbruster | 0fb6395 | 2014-04-25 16:50:31 +0200 | [diff] [blame] | 914 | if (local_err) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 915 | error_propagate(errp, local_err); |
| 916 | return -EINVAL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 917 | } |
| 918 | qdict_del(options, "node-name"); |
| 919 | |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 920 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
| 921 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) |
| 922 | * and return immediately. */ |
| 923 | if (file != NULL && drv->bdrv_file_open) { |
| 924 | bdrv_swap(file, bs); |
| 925 | return 0; |
| 926 | } |
| 927 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 928 | bs->open_flags = flags; |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 929 | bs->guest_block_size = 512; |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 930 | bs->request_alignment = 512; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 931 | bs->zero_beyond_eof = true; |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 932 | open_flags = bdrv_open_flags(bs, flags); |
| 933 | bs->read_only = !(open_flags & BDRV_O_RDWR); |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 934 | bs->growable = !!(flags & BDRV_O_PROTOCOL); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 935 | |
| 936 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { |
Kevin Wolf | 8f94a6e | 2013-10-10 11:45:55 +0200 | [diff] [blame] | 937 | error_setg(errp, |
| 938 | !bs->read_only && bdrv_is_whitelisted(drv, true) |
| 939 | ? "Driver '%s' can only be used for read-only devices" |
| 940 | : "Driver '%s' is not whitelisted", |
| 941 | drv->format_name); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 942 | return -ENOTSUP; |
| 943 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 944 | |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 945 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 946 | if (flags & BDRV_O_COPY_ON_READ) { |
| 947 | if (!bs->read_only) { |
| 948 | bdrv_enable_copy_on_read(bs); |
| 949 | } else { |
| 950 | error_setg(errp, "Can't use copy-on-read on read-only device"); |
| 951 | return -EINVAL; |
| 952 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 953 | } |
| 954 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 955 | if (filename != NULL) { |
| 956 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 957 | } else { |
| 958 | bs->filename[0] = '\0'; |
| 959 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 960 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 961 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 962 | bs->drv = drv; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 963 | bs->opaque = g_malloc0(drv->instance_size); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 964 | |
Stefan Hajnoczi | 03f541b | 2011-10-27 10:54:28 +0100 | [diff] [blame] | 965 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
Stefan Hajnoczi | e7c6379 | 2011-10-27 10:54:27 +0100 | [diff] [blame] | 966 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 967 | /* Open the image, either directly or using a protocol */ |
| 968 | if (drv->bdrv_file_open) { |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 969 | assert(file == NULL); |
Benoît Canet | 030be32 | 2013-09-24 17:07:04 +0200 | [diff] [blame] | 970 | assert(!drv->bdrv_needs_filename || filename != NULL); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 971 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 972 | } else { |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 973 | if (file == NULL) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 974 | error_setg(errp, "Can't use '%s' as a block driver for the " |
| 975 | "protocol level", drv->format_name); |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 976 | ret = -EINVAL; |
| 977 | goto free_and_fail; |
| 978 | } |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 979 | bs->file = file; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 980 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 981 | } |
| 982 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 983 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 984 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 985 | error_propagate(errp, local_err); |
Dunrong Huang | 2fa9aa5 | 2013-09-24 18:14:01 +0800 | [diff] [blame] | 986 | } else if (bs->filename[0]) { |
| 987 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 988 | } else { |
| 989 | error_setg_errno(errp, -ret, "Could not open image"); |
| 990 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 991 | goto free_and_fail; |
| 992 | } |
| 993 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 994 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 995 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 996 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 997 | goto free_and_fail; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 998 | } |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 999 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1000 | bdrv_refresh_limits(bs, &local_err); |
| 1001 | if (local_err) { |
| 1002 | error_propagate(errp, local_err); |
| 1003 | ret = -EINVAL; |
| 1004 | goto free_and_fail; |
| 1005 | } |
| 1006 | |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 1007 | assert(bdrv_opt_mem_align(bs) != 0); |
Kevin Wolf | 47ea2de | 2014-03-05 15:49:55 +0100 | [diff] [blame] | 1008 | assert((bs->request_alignment != 0) || bs->sg); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1009 | return 0; |
| 1010 | |
| 1011 | free_and_fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1012 | bs->file = NULL; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 1013 | g_free(bs->opaque); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1014 | bs->opaque = NULL; |
| 1015 | bs->drv = NULL; |
| 1016 | return ret; |
| 1017 | } |
| 1018 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1019 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1020 | { |
| 1021 | QObject *options_obj; |
| 1022 | QDict *options; |
| 1023 | int ret; |
| 1024 | |
| 1025 | ret = strstart(filename, "json:", &filename); |
| 1026 | assert(ret); |
| 1027 | |
| 1028 | options_obj = qobject_from_json(filename); |
| 1029 | if (!options_obj) { |
| 1030 | error_setg(errp, "Could not parse the JSON options"); |
| 1031 | return NULL; |
| 1032 | } |
| 1033 | |
| 1034 | if (qobject_type(options_obj) != QTYPE_QDICT) { |
| 1035 | qobject_decref(options_obj); |
| 1036 | error_setg(errp, "Invalid JSON object given"); |
| 1037 | return NULL; |
| 1038 | } |
| 1039 | |
| 1040 | options = qobject_to_qdict(options_obj); |
| 1041 | qdict_flatten(options); |
| 1042 | |
| 1043 | return options; |
| 1044 | } |
| 1045 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1046 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1047 | * Fills in default options for opening images and converts the legacy |
| 1048 | * filename/flags pair to option QDict entries. |
| 1049 | */ |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1050 | static int bdrv_fill_options(QDict **options, const char **pfilename, int flags, |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1051 | BlockDriver *drv, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1052 | { |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1053 | const char *filename = *pfilename; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1054 | const char *drvname; |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 1055 | bool protocol = flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1056 | bool parse_filename = false; |
| 1057 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1058 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1059 | /* Parse json: pseudo-protocol */ |
| 1060 | if (filename && g_str_has_prefix(filename, "json:")) { |
| 1061 | QDict *json_options = parse_json_filename(filename, &local_err); |
| 1062 | if (local_err) { |
| 1063 | error_propagate(errp, local_err); |
| 1064 | return -EINVAL; |
| 1065 | } |
| 1066 | |
| 1067 | /* Options given in the filename have lower priority than options |
| 1068 | * specified directly */ |
| 1069 | qdict_join(*options, json_options, false); |
| 1070 | QDECREF(json_options); |
| 1071 | *pfilename = filename = NULL; |
| 1072 | } |
| 1073 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1074 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1075 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1076 | if (!qdict_haskey(*options, "filename")) { |
| 1077 | qdict_put(*options, "filename", qstring_from_str(filename)); |
| 1078 | parse_filename = true; |
| 1079 | } else { |
| 1080 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 1081 | "the same time"); |
| 1082 | return -EINVAL; |
| 1083 | } |
| 1084 | } |
| 1085 | |
| 1086 | /* Find the right block driver */ |
| 1087 | filename = qdict_get_try_str(*options, "filename"); |
| 1088 | drvname = qdict_get_try_str(*options, "driver"); |
| 1089 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1090 | if (drv) { |
| 1091 | if (drvname) { |
| 1092 | error_setg(errp, "Driver specified twice"); |
| 1093 | return -EINVAL; |
| 1094 | } |
| 1095 | drvname = drv->format_name; |
| 1096 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1097 | } else { |
| 1098 | if (!drvname && protocol) { |
| 1099 | if (filename) { |
| 1100 | drv = bdrv_find_protocol(filename, parse_filename); |
| 1101 | if (!drv) { |
| 1102 | error_setg(errp, "Unknown protocol"); |
| 1103 | return -EINVAL; |
| 1104 | } |
| 1105 | |
| 1106 | drvname = drv->format_name; |
| 1107 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1108 | } else { |
| 1109 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1110 | return -EINVAL; |
| 1111 | } |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1112 | } else if (drvname) { |
| 1113 | drv = bdrv_find_format(drvname); |
| 1114 | if (!drv) { |
| 1115 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 1116 | return -ENOENT; |
| 1117 | } |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1118 | } |
| 1119 | } |
| 1120 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1121 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1122 | |
| 1123 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1124 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1125 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 1126 | if (local_err) { |
| 1127 | error_propagate(errp, local_err); |
| 1128 | return -EINVAL; |
| 1129 | } |
| 1130 | |
| 1131 | if (!drv->bdrv_needs_filename) { |
| 1132 | qdict_del(*options, "filename"); |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | return 0; |
| 1137 | } |
| 1138 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1139 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
| 1140 | { |
| 1141 | |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1142 | if (bs->backing_hd) { |
| 1143 | assert(bs->backing_blocker); |
| 1144 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); |
| 1145 | } else if (backing_hd) { |
| 1146 | error_setg(&bs->backing_blocker, |
| 1147 | "device is used as backing hd of '%s'", |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1148 | bdrv_get_device_name(bs)); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1149 | } |
| 1150 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1151 | bs->backing_hd = backing_hd; |
| 1152 | if (!backing_hd) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1153 | error_free(bs->backing_blocker); |
| 1154 | bs->backing_blocker = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1155 | goto out; |
| 1156 | } |
| 1157 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
| 1158 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); |
| 1159 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), |
| 1160 | backing_hd->drv ? backing_hd->drv->format_name : ""); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1161 | |
| 1162 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); |
| 1163 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ |
| 1164 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, |
| 1165 | bs->backing_blocker); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1166 | out: |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1167 | bdrv_refresh_limits(bs, NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1168 | } |
| 1169 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1170 | /* |
| 1171 | * Opens the backing file for a BlockDriverState if not yet open |
| 1172 | * |
| 1173 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1174 | * empty set of options. The reference to the QDict is transferred to this |
| 1175 | * function (even on failure), so if the caller intends to reuse the dictionary, |
| 1176 | * it needs to use QINCREF() before calling bdrv_file_open. |
| 1177 | */ |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1178 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1179 | { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1180 | char *backing_filename = g_malloc0(PATH_MAX); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1181 | int ret = 0; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1182 | BlockDriver *back_drv = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1183 | BlockDriverState *backing_hd; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1184 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1185 | |
| 1186 | if (bs->backing_hd != NULL) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1187 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1188 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1189 | } |
| 1190 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1191 | /* NULL means an empty set of options */ |
| 1192 | if (options == NULL) { |
| 1193 | options = qdict_new(); |
| 1194 | } |
| 1195 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1196 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 1197 | if (qdict_haskey(options, "file.filename")) { |
| 1198 | backing_filename[0] = '\0'; |
| 1199 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1200 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1201 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 1202 | } else { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1203 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1204 | } |
| 1205 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 1206 | if (!bs->drv || !bs->drv->supports_backing) { |
| 1207 | ret = -EINVAL; |
| 1208 | error_setg(errp, "Driver doesn't support backing files"); |
| 1209 | QDECREF(options); |
| 1210 | goto free_exit; |
| 1211 | } |
| 1212 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1213 | backing_hd = bdrv_new(); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1214 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1215 | if (bs->backing_format[0] != '\0') { |
| 1216 | back_drv = bdrv_find_format(bs->backing_format); |
| 1217 | } |
| 1218 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1219 | assert(bs->backing_hd == NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1220 | ret = bdrv_open(&backing_hd, |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1221 | *backing_filename ? backing_filename : NULL, NULL, options, |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1222 | bdrv_backing_flags(bs->open_flags), back_drv, &local_err); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1223 | if (ret < 0) { |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1224 | bdrv_unref(backing_hd); |
| 1225 | backing_hd = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1226 | bs->open_flags |= BDRV_O_NO_BACKING; |
Fam Zheng | b04b6b6 | 2013-11-08 11:26:49 +0800 | [diff] [blame] | 1227 | error_setg(errp, "Could not open backing file: %s", |
| 1228 | error_get_pretty(local_err)); |
| 1229 | error_free(local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1230 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1231 | } |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1232 | bdrv_set_backing_hd(bs, backing_hd); |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 1233 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1234 | free_exit: |
| 1235 | g_free(backing_filename); |
| 1236 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1237 | } |
| 1238 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1239 | /* |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1240 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 1241 | * device's options. |
| 1242 | * |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1243 | * If allow_none is true, no image will be opened if filename is false and no |
| 1244 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. |
| 1245 | * |
| 1246 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 1247 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 1248 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 1249 | * BlockdevRef. |
| 1250 | * |
| 1251 | * The BlockdevRef will be removed from the options QDict. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1252 | * |
| 1253 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1254 | */ |
| 1255 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, |
| 1256 | QDict *options, const char *bdref_key, int flags, |
Max Reitz | f7d9fd8 | 2014-02-18 18:33:12 +0100 | [diff] [blame] | 1257 | bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1258 | { |
| 1259 | QDict *image_options; |
| 1260 | int ret; |
| 1261 | char *bdref_key_dot; |
| 1262 | const char *reference; |
| 1263 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1264 | assert(pbs); |
| 1265 | assert(*pbs == NULL); |
| 1266 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1267 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 1268 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 1269 | g_free(bdref_key_dot); |
| 1270 | |
| 1271 | reference = qdict_get_try_str(options, bdref_key); |
| 1272 | if (!filename && !reference && !qdict_size(image_options)) { |
| 1273 | if (allow_none) { |
| 1274 | ret = 0; |
| 1275 | } else { |
| 1276 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 1277 | bdref_key); |
| 1278 | ret = -EINVAL; |
| 1279 | } |
Markus Armbruster | b20e61e | 2014-05-28 11:16:57 +0200 | [diff] [blame] | 1280 | QDECREF(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1281 | goto done; |
| 1282 | } |
| 1283 | |
Max Reitz | f7d9fd8 | 2014-02-18 18:33:12 +0100 | [diff] [blame] | 1284 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1285 | |
| 1286 | done: |
| 1287 | qdict_del(options, bdref_key); |
| 1288 | return ret; |
| 1289 | } |
| 1290 | |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1291 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1292 | { |
| 1293 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1294 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1295 | int64_t total_size; |
| 1296 | BlockDriver *bdrv_qcow2; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1297 | QemuOpts *opts = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1298 | QDict *snapshot_options; |
| 1299 | BlockDriverState *bs_snapshot; |
| 1300 | Error *local_err; |
| 1301 | int ret; |
| 1302 | |
| 1303 | /* if snapshot, we create a temporary backing file and open it |
| 1304 | instead of opening 'filename' directly */ |
| 1305 | |
| 1306 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1307 | total_size = bdrv_getlength(bs); |
| 1308 | if (total_size < 0) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1309 | ret = total_size; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1310 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1311 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1312 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1313 | |
| 1314 | /* Create the temporary image */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1315 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1316 | if (ret < 0) { |
| 1317 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1318 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1319 | } |
| 1320 | |
| 1321 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1322 | opts = qemu_opts_create(bdrv_qcow2->create_opts, NULL, 0, |
| 1323 | &error_abort); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1324 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size); |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1325 | ret = bdrv_create(bdrv_qcow2, tmp_filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1326 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1327 | if (ret < 0) { |
| 1328 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
| 1329 | "'%s': %s", tmp_filename, |
| 1330 | error_get_pretty(local_err)); |
| 1331 | error_free(local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1332 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1333 | } |
| 1334 | |
| 1335 | /* Prepare a new options QDict for the temporary file */ |
| 1336 | snapshot_options = qdict_new(); |
| 1337 | qdict_put(snapshot_options, "file.driver", |
| 1338 | qstring_from_str("file")); |
| 1339 | qdict_put(snapshot_options, "file.filename", |
| 1340 | qstring_from_str(tmp_filename)); |
| 1341 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1342 | bs_snapshot = bdrv_new(); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1343 | |
| 1344 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1345 | flags, bdrv_qcow2, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1346 | if (ret < 0) { |
| 1347 | error_propagate(errp, local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1348 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1349 | } |
| 1350 | |
| 1351 | bdrv_append(bs_snapshot, bs); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1352 | |
| 1353 | out: |
| 1354 | g_free(tmp_filename); |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1355 | return ret; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1356 | } |
| 1357 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1358 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1359 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1360 | * |
| 1361 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1362 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1363 | * after the call (even on failure), so if the caller intends to reuse the |
| 1364 | * dictionary, it needs to use QINCREF() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1365 | * |
| 1366 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 1367 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1368 | * |
| 1369 | * The reference parameter may be used to specify an existing block device which |
| 1370 | * should be opened. If specified, neither options nor a filename may be given, |
| 1371 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1372 | */ |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1373 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
| 1374 | const char *reference, QDict *options, int flags, |
| 1375 | BlockDriver *drv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1376 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1377 | int ret; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1378 | BlockDriverState *file = NULL, *bs; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 1379 | const char *drvname; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1380 | Error *local_err = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1381 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 1382 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1383 | assert(pbs); |
| 1384 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1385 | if (reference) { |
| 1386 | bool options_non_empty = options ? qdict_size(options) : false; |
| 1387 | QDECREF(options); |
| 1388 | |
| 1389 | if (*pbs) { |
| 1390 | error_setg(errp, "Cannot reuse an existing BDS when referencing " |
| 1391 | "another block device"); |
| 1392 | return -EINVAL; |
| 1393 | } |
| 1394 | |
| 1395 | if (filename || options_non_empty) { |
| 1396 | error_setg(errp, "Cannot reference an existing block device with " |
| 1397 | "additional options or a new filename"); |
| 1398 | return -EINVAL; |
| 1399 | } |
| 1400 | |
| 1401 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 1402 | if (!bs) { |
| 1403 | return -ENODEV; |
| 1404 | } |
| 1405 | bdrv_ref(bs); |
| 1406 | *pbs = bs; |
| 1407 | return 0; |
| 1408 | } |
| 1409 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1410 | if (*pbs) { |
| 1411 | bs = *pbs; |
| 1412 | } else { |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1413 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1414 | } |
| 1415 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1416 | /* NULL means an empty set of options */ |
| 1417 | if (options == NULL) { |
| 1418 | options = qdict_new(); |
| 1419 | } |
| 1420 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1421 | ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err); |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 1422 | if (local_err) { |
| 1423 | goto fail; |
| 1424 | } |
| 1425 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1426 | /* Find the right image format driver */ |
| 1427 | drv = NULL; |
| 1428 | drvname = qdict_get_try_str(options, "driver"); |
| 1429 | if (drvname) { |
| 1430 | drv = bdrv_find_format(drvname); |
| 1431 | qdict_del(options, "driver"); |
| 1432 | if (!drv) { |
| 1433 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 1434 | ret = -EINVAL; |
| 1435 | goto fail; |
| 1436 | } |
| 1437 | } |
| 1438 | |
| 1439 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
| 1440 | if (drv && !drv->bdrv_file_open) { |
| 1441 | /* If the user explicitly wants a format driver here, we'll need to add |
| 1442 | * another layer for the protocol in bs->file */ |
| 1443 | flags &= ~BDRV_O_PROTOCOL; |
| 1444 | } |
| 1445 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1446 | bs->options = options; |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1447 | options = qdict_clone_shallow(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1448 | |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1449 | /* Open image file without format layer */ |
| 1450 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
| 1451 | if (flags & BDRV_O_RDWR) { |
| 1452 | flags |= BDRV_O_ALLOW_RDWR; |
| 1453 | } |
| 1454 | if (flags & BDRV_O_SNAPSHOT) { |
| 1455 | snapshot_flags = bdrv_temp_snapshot_flags(flags); |
| 1456 | flags = bdrv_backing_flags(flags); |
| 1457 | } |
| 1458 | |
| 1459 | assert(file == NULL); |
| 1460 | ret = bdrv_open_image(&file, filename, options, "file", |
| 1461 | bdrv_inherited_flags(flags), |
| 1462 | true, &local_err); |
| 1463 | if (ret < 0) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 1464 | goto fail; |
| 1465 | } |
| 1466 | } |
| 1467 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1468 | /* Image format probing */ |
| 1469 | if (!drv && file) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1470 | ret = find_image_format(file, filename, &drv, &local_err); |
| 1471 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1472 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1473 | } |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1474 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1475 | error_setg(errp, "Must specify either driver or file"); |
| 1476 | ret = -EINVAL; |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1477 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1478 | } |
| 1479 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1480 | /* Open the image */ |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1481 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1482 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1483 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 1484 | } |
| 1485 | |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1486 | if (file && (bs->file != file)) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1487 | bdrv_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1488 | file = NULL; |
| 1489 | } |
| 1490 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1491 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1492 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1493 | QDict *backing_options; |
| 1494 | |
Benoît Canet | 5726d87 | 2013-09-25 13:30:01 +0200 | [diff] [blame] | 1495 | qdict_extract_subqdict(options, &backing_options, "backing."); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1496 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1497 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1498 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1499 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1500 | } |
| 1501 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1502 | bdrv_refresh_filename(bs); |
| 1503 | |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1504 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 1505 | * temporary snapshot afterwards. */ |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1506 | if (snapshot_flags) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1507 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1508 | if (local_err) { |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1509 | goto close_and_fail; |
| 1510 | } |
| 1511 | } |
| 1512 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1513 | /* Check if any unknown options were used */ |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1514 | if (options && (qdict_size(options) != 0)) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1515 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1516 | if (flags & BDRV_O_PROTOCOL) { |
| 1517 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 1518 | "'%s'", drv->format_name, entry->key); |
| 1519 | } else { |
| 1520 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
| 1521 | "support the option '%s'", drv->format_name, |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1522 | bdrv_get_device_name(bs), entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1523 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1524 | |
| 1525 | ret = -EINVAL; |
| 1526 | goto close_and_fail; |
| 1527 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1528 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1529 | if (!bdrv_key_required(bs)) { |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 1530 | bdrv_dev_change_media_cb(bs, true); |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1531 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
| 1532 | && !runstate_check(RUN_STATE_INMIGRATE) |
| 1533 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ |
| 1534 | error_setg(errp, |
| 1535 | "Guest must be stopped for opening of encrypted image"); |
| 1536 | ret = -EBUSY; |
| 1537 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1538 | } |
| 1539 | |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1540 | QDECREF(options); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1541 | *pbs = bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1542 | return 0; |
| 1543 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1544 | fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1545 | if (file != NULL) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1546 | bdrv_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1547 | } |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1548 | QDECREF(bs->options); |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1549 | QDECREF(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1550 | bs->options = NULL; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1551 | if (!*pbs) { |
| 1552 | /* If *pbs is NULL, a new BDS has been created in this function and |
| 1553 | needs to be freed now. Otherwise, it does not need to be closed, |
| 1554 | since it has not really been opened yet. */ |
| 1555 | bdrv_unref(bs); |
| 1556 | } |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1557 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1558 | error_propagate(errp, local_err); |
| 1559 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1560 | return ret; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1561 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1562 | close_and_fail: |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1563 | /* See fail path, but now the BDS has to be always closed */ |
| 1564 | if (*pbs) { |
| 1565 | bdrv_close(bs); |
| 1566 | } else { |
| 1567 | bdrv_unref(bs); |
| 1568 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1569 | QDECREF(options); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1570 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1571 | error_propagate(errp, local_err); |
| 1572 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1573 | return ret; |
| 1574 | } |
| 1575 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1576 | typedef struct BlockReopenQueueEntry { |
| 1577 | bool prepared; |
| 1578 | BDRVReopenState state; |
| 1579 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; |
| 1580 | } BlockReopenQueueEntry; |
| 1581 | |
| 1582 | /* |
| 1583 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 1584 | * reopen of multiple devices. |
| 1585 | * |
| 1586 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT |
| 1587 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 1588 | * be created and initialized. This newly created BlockReopenQueue should be |
| 1589 | * passed back in for subsequent calls that are intended to be of the same |
| 1590 | * atomic 'set'. |
| 1591 | * |
| 1592 | * bs is the BlockDriverState to add to the reopen queue. |
| 1593 | * |
| 1594 | * flags contains the open flags for the associated bs |
| 1595 | * |
| 1596 | * returns a pointer to bs_queue, which is either the newly allocated |
| 1597 | * bs_queue, or the existing bs_queue being used. |
| 1598 | * |
| 1599 | */ |
| 1600 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 1601 | BlockDriverState *bs, int flags) |
| 1602 | { |
| 1603 | assert(bs != NULL); |
| 1604 | |
| 1605 | BlockReopenQueueEntry *bs_entry; |
| 1606 | if (bs_queue == NULL) { |
| 1607 | bs_queue = g_new0(BlockReopenQueue, 1); |
| 1608 | QSIMPLEQ_INIT(bs_queue); |
| 1609 | } |
| 1610 | |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 1611 | /* bdrv_open() masks this flag out */ |
| 1612 | flags &= ~BDRV_O_PROTOCOL; |
| 1613 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1614 | if (bs->file) { |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 1615 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1616 | } |
| 1617 | |
| 1618 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
| 1619 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
| 1620 | |
| 1621 | bs_entry->state.bs = bs; |
| 1622 | bs_entry->state.flags = flags; |
| 1623 | |
| 1624 | return bs_queue; |
| 1625 | } |
| 1626 | |
| 1627 | /* |
| 1628 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 1629 | * |
| 1630 | * The queue passed in (bs_queue) must have been built up previous |
| 1631 | * via bdrv_reopen_queue(). |
| 1632 | * |
| 1633 | * Reopens all BDS specified in the queue, with the appropriate |
| 1634 | * flags. All devices are prepared for reopen, and failure of any |
| 1635 | * device will cause all device changes to be abandonded, and intermediate |
| 1636 | * data cleaned up. |
| 1637 | * |
| 1638 | * If all devices prepare successfully, then the changes are committed |
| 1639 | * to all devices. |
| 1640 | * |
| 1641 | */ |
| 1642 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
| 1643 | { |
| 1644 | int ret = -1; |
| 1645 | BlockReopenQueueEntry *bs_entry, *next; |
| 1646 | Error *local_err = NULL; |
| 1647 | |
| 1648 | assert(bs_queue != NULL); |
| 1649 | |
| 1650 | bdrv_drain_all(); |
| 1651 | |
| 1652 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1653 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { |
| 1654 | error_propagate(errp, local_err); |
| 1655 | goto cleanup; |
| 1656 | } |
| 1657 | bs_entry->prepared = true; |
| 1658 | } |
| 1659 | |
| 1660 | /* If we reach this point, we have success and just need to apply the |
| 1661 | * changes |
| 1662 | */ |
| 1663 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1664 | bdrv_reopen_commit(&bs_entry->state); |
| 1665 | } |
| 1666 | |
| 1667 | ret = 0; |
| 1668 | |
| 1669 | cleanup: |
| 1670 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
| 1671 | if (ret && bs_entry->prepared) { |
| 1672 | bdrv_reopen_abort(&bs_entry->state); |
| 1673 | } |
| 1674 | g_free(bs_entry); |
| 1675 | } |
| 1676 | g_free(bs_queue); |
| 1677 | return ret; |
| 1678 | } |
| 1679 | |
| 1680 | |
| 1681 | /* Reopen a single BlockDriverState with the specified flags. */ |
| 1682 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) |
| 1683 | { |
| 1684 | int ret = -1; |
| 1685 | Error *local_err = NULL; |
| 1686 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); |
| 1687 | |
| 1688 | ret = bdrv_reopen_multiple(queue, &local_err); |
| 1689 | if (local_err != NULL) { |
| 1690 | error_propagate(errp, local_err); |
| 1691 | } |
| 1692 | return ret; |
| 1693 | } |
| 1694 | |
| 1695 | |
| 1696 | /* |
| 1697 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 1698 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 1699 | * the block driver layer .bdrv_reopen_prepare() |
| 1700 | * |
| 1701 | * bs is the BlockDriverState to reopen |
| 1702 | * flags are the new open flags |
| 1703 | * queue is the reopen queue |
| 1704 | * |
| 1705 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 1706 | * as well. |
| 1707 | * |
| 1708 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 1709 | * It is the responsibility of the caller to then call the abort() or |
| 1710 | * commit() for any other BDS that have been left in a prepare() state |
| 1711 | * |
| 1712 | */ |
| 1713 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 1714 | Error **errp) |
| 1715 | { |
| 1716 | int ret = -1; |
| 1717 | Error *local_err = NULL; |
| 1718 | BlockDriver *drv; |
| 1719 | |
| 1720 | assert(reopen_state != NULL); |
| 1721 | assert(reopen_state->bs->drv != NULL); |
| 1722 | drv = reopen_state->bs->drv; |
| 1723 | |
| 1724 | /* if we are to stay read-only, do not allow permission change |
| 1725 | * to r/w */ |
| 1726 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 1727 | reopen_state->flags & BDRV_O_RDWR) { |
| 1728 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1729 | bdrv_get_device_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1730 | goto error; |
| 1731 | } |
| 1732 | |
| 1733 | |
| 1734 | ret = bdrv_flush(reopen_state->bs); |
| 1735 | if (ret) { |
| 1736 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", |
| 1737 | strerror(-ret)); |
| 1738 | goto error; |
| 1739 | } |
| 1740 | |
| 1741 | if (drv->bdrv_reopen_prepare) { |
| 1742 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 1743 | if (ret) { |
| 1744 | if (local_err != NULL) { |
| 1745 | error_propagate(errp, local_err); |
| 1746 | } else { |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 1747 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 1748 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1749 | } |
| 1750 | goto error; |
| 1751 | } |
| 1752 | } else { |
| 1753 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 1754 | * handler for each supported drv. */ |
| 1755 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1756 | drv->format_name, bdrv_get_device_name(reopen_state->bs), |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1757 | "reopening of file"); |
| 1758 | ret = -1; |
| 1759 | goto error; |
| 1760 | } |
| 1761 | |
| 1762 | ret = 0; |
| 1763 | |
| 1764 | error: |
| 1765 | return ret; |
| 1766 | } |
| 1767 | |
| 1768 | /* |
| 1769 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 1770 | * makes them final by swapping the staging BlockDriverState contents into |
| 1771 | * the active BlockDriverState contents. |
| 1772 | */ |
| 1773 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
| 1774 | { |
| 1775 | BlockDriver *drv; |
| 1776 | |
| 1777 | assert(reopen_state != NULL); |
| 1778 | drv = reopen_state->bs->drv; |
| 1779 | assert(drv != NULL); |
| 1780 | |
| 1781 | /* If there are any driver level actions to take */ |
| 1782 | if (drv->bdrv_reopen_commit) { |
| 1783 | drv->bdrv_reopen_commit(reopen_state); |
| 1784 | } |
| 1785 | |
| 1786 | /* set BDS specific flags now */ |
| 1787 | reopen_state->bs->open_flags = reopen_state->flags; |
| 1788 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & |
| 1789 | BDRV_O_CACHE_WB); |
| 1790 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 1791 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1792 | bdrv_refresh_limits(reopen_state->bs, NULL); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1793 | } |
| 1794 | |
| 1795 | /* |
| 1796 | * Abort the reopen, and delete and free the staged changes in |
| 1797 | * reopen_state |
| 1798 | */ |
| 1799 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
| 1800 | { |
| 1801 | BlockDriver *drv; |
| 1802 | |
| 1803 | assert(reopen_state != NULL); |
| 1804 | drv = reopen_state->bs->drv; |
| 1805 | assert(drv != NULL); |
| 1806 | |
| 1807 | if (drv->bdrv_reopen_abort) { |
| 1808 | drv->bdrv_reopen_abort(reopen_state); |
| 1809 | } |
| 1810 | } |
| 1811 | |
| 1812 | |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1813 | void bdrv_close(BlockDriverState *bs) |
| 1814 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 1815 | BdrvAioNotifier *ban, *ban_next; |
| 1816 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 1817 | if (bs->job) { |
| 1818 | block_job_cancel_sync(bs->job); |
| 1819 | } |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 1820 | bdrv_drain_all(); /* complete I/O */ |
| 1821 | bdrv_flush(bs); |
| 1822 | bdrv_drain_all(); /* in case flush left pending I/O */ |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 1823 | notifier_list_notify(&bs->close_notifiers, bs); |
Kevin Wolf | 7094f12 | 2012-04-11 11:06:37 +0200 | [diff] [blame] | 1824 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 1825 | if (bs->drv) { |
Stefan Hajnoczi | 557df6a | 2010-04-17 10:49:06 +0100 | [diff] [blame] | 1826 | if (bs->backing_hd) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1827 | BlockDriverState *backing_hd = bs->backing_hd; |
| 1828 | bdrv_set_backing_hd(bs, NULL); |
| 1829 | bdrv_unref(backing_hd); |
Stefan Hajnoczi | 557df6a | 2010-04-17 10:49:06 +0100 | [diff] [blame] | 1830 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1831 | bs->drv->bdrv_close(bs); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 1832 | g_free(bs->opaque); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1833 | bs->opaque = NULL; |
| 1834 | bs->drv = NULL; |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1835 | bs->copy_on_read = 0; |
Paolo Bonzini | a275fa4 | 2012-05-08 16:51:43 +0200 | [diff] [blame] | 1836 | bs->backing_file[0] = '\0'; |
| 1837 | bs->backing_format[0] = '\0'; |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1838 | bs->total_sectors = 0; |
| 1839 | bs->encrypted = 0; |
| 1840 | bs->valid_key = 0; |
| 1841 | bs->sg = 0; |
| 1842 | bs->growable = 0; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 1843 | bs->zero_beyond_eof = false; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1844 | QDECREF(bs->options); |
| 1845 | bs->options = NULL; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1846 | QDECREF(bs->full_open_options); |
| 1847 | bs->full_open_options = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1848 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1849 | if (bs->file != NULL) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1850 | bdrv_unref(bs->file); |
Paolo Bonzini | 0ac9377 | 2012-05-08 16:51:44 +0200 | [diff] [blame] | 1851 | bs->file = NULL; |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1852 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1853 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 1854 | |
Pavel Hrdina | 9ca1115 | 2012-08-09 12:44:48 +0200 | [diff] [blame] | 1855 | bdrv_dev_change_media_cb(bs, false); |
| 1856 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 1857 | /*throttling disk I/O limits*/ |
| 1858 | if (bs->io_limits_enabled) { |
| 1859 | bdrv_io_limits_disable(bs); |
| 1860 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 1861 | |
| 1862 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 1863 | g_free(ban); |
| 1864 | } |
| 1865 | QLIST_INIT(&bs->aio_notifiers); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1866 | } |
| 1867 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1868 | void bdrv_close_all(void) |
| 1869 | { |
| 1870 | BlockDriverState *bs; |
| 1871 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1872 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 1873 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 1874 | |
| 1875 | aio_context_acquire(aio_context); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1876 | bdrv_close(bs); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 1877 | aio_context_release(aio_context); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1878 | } |
| 1879 | } |
| 1880 | |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1881 | /* Check if any requests are in-flight (including throttled requests) */ |
| 1882 | static bool bdrv_requests_pending(BlockDriverState *bs) |
| 1883 | { |
| 1884 | if (!QLIST_EMPTY(&bs->tracked_requests)) { |
| 1885 | return true; |
| 1886 | } |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 1887 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
| 1888 | return true; |
| 1889 | } |
| 1890 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1891 | return true; |
| 1892 | } |
| 1893 | if (bs->file && bdrv_requests_pending(bs->file)) { |
| 1894 | return true; |
| 1895 | } |
| 1896 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { |
| 1897 | return true; |
| 1898 | } |
| 1899 | return false; |
| 1900 | } |
| 1901 | |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1902 | /* |
| 1903 | * Wait for pending requests to complete across all BlockDriverStates |
| 1904 | * |
| 1905 | * This function does not flush data to disk, use bdrv_flush_all() for that |
| 1906 | * after calling this function. |
Zhi Yong Wu | 4c355d5 | 2012-04-12 14:00:57 +0200 | [diff] [blame] | 1907 | * |
| 1908 | * Note that completion of an asynchronous I/O operation can trigger any |
| 1909 | * number of other I/O operations on other devices---for example a coroutine |
| 1910 | * can be arbitrarily complex and a constant flow of I/O can come until the |
| 1911 | * coroutine is complete. Because of this, it is not possible to have a |
| 1912 | * function to drain a single device's I/O queue. |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1913 | */ |
| 1914 | void bdrv_drain_all(void) |
| 1915 | { |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1916 | /* Always run first iteration so any pending completion BHs run */ |
| 1917 | bool busy = true; |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1918 | BlockDriverState *bs; |
| 1919 | |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1920 | while (busy) { |
Stefan Hajnoczi | 9b536ad | 2014-05-08 16:34:36 +0200 | [diff] [blame] | 1921 | busy = false; |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1922 | |
Stefan Hajnoczi | 9b536ad | 2014-05-08 16:34:36 +0200 | [diff] [blame] | 1923 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 1924 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 1925 | bool bs_busy; |
| 1926 | |
| 1927 | aio_context_acquire(aio_context); |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 1928 | bdrv_flush_io_queue(bs); |
Stefan Hajnoczi | 9b536ad | 2014-05-08 16:34:36 +0200 | [diff] [blame] | 1929 | bdrv_start_throttled_reqs(bs); |
| 1930 | bs_busy = bdrv_requests_pending(bs); |
| 1931 | bs_busy |= aio_poll(aio_context, bs_busy); |
| 1932 | aio_context_release(aio_context); |
| 1933 | |
| 1934 | busy |= bs_busy; |
| 1935 | } |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1936 | } |
| 1937 | } |
| 1938 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1939 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
| 1940 | * graph_bdrv_state list. |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1941 | Also, NULL terminate the device_name to prevent double remove */ |
| 1942 | void bdrv_make_anon(BlockDriverState *bs) |
| 1943 | { |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1944 | /* |
| 1945 | * Take care to remove bs from bdrv_states only when it's actually |
| 1946 | * in it. Note that bs->device_list.tqe_prev is initially null, |
| 1947 | * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish |
| 1948 | * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by |
| 1949 | * resetting it to null on remove. |
| 1950 | */ |
| 1951 | if (bs->device_list.tqe_prev) { |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1952 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1953 | bs->device_list.tqe_prev = NULL; |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1954 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1955 | if (bs->node_name[0] != '\0') { |
| 1956 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 1957 | } |
| 1958 | bs->node_name[0] = '\0'; |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1959 | } |
| 1960 | |
Paolo Bonzini | e023b2e | 2012-05-08 16:51:41 +0200 | [diff] [blame] | 1961 | static void bdrv_rebind(BlockDriverState *bs) |
| 1962 | { |
| 1963 | if (bs->drv && bs->drv->bdrv_rebind) { |
| 1964 | bs->drv->bdrv_rebind(bs); |
| 1965 | } |
| 1966 | } |
| 1967 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1968 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
| 1969 | BlockDriverState *bs_src) |
| 1970 | { |
| 1971 | /* move some fields that need to stay attached to the device */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1972 | |
| 1973 | /* dev info */ |
| 1974 | bs_dest->dev_ops = bs_src->dev_ops; |
| 1975 | bs_dest->dev_opaque = bs_src->dev_opaque; |
| 1976 | bs_dest->dev = bs_src->dev; |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 1977 | bs_dest->guest_block_size = bs_src->guest_block_size; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1978 | bs_dest->copy_on_read = bs_src->copy_on_read; |
| 1979 | |
| 1980 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
| 1981 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 1982 | /* i/o throttled req */ |
| 1983 | memcpy(&bs_dest->throttle_state, |
| 1984 | &bs_src->throttle_state, |
| 1985 | sizeof(ThrottleState)); |
| 1986 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; |
| 1987 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1988 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
| 1989 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1990 | /* r/w error */ |
| 1991 | bs_dest->on_read_error = bs_src->on_read_error; |
| 1992 | bs_dest->on_write_error = bs_src->on_write_error; |
| 1993 | |
| 1994 | /* i/o status */ |
| 1995 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
| 1996 | bs_dest->iostatus = bs_src->iostatus; |
| 1997 | |
| 1998 | /* dirty bitmap */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 1999 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2000 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 2001 | /* reference count */ |
| 2002 | bs_dest->refcnt = bs_src->refcnt; |
| 2003 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2004 | /* job */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2005 | bs_dest->job = bs_src->job; |
| 2006 | |
| 2007 | /* keep the same entry in bdrv_states */ |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2008 | bs_dest->device_list = bs_src->device_list; |
Markus Armbruster | 7e7d56d | 2014-10-07 13:59:05 +0200 | [diff] [blame] | 2009 | bs_dest->blk = bs_src->blk; |
| 2010 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 2011 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
| 2012 | sizeof(bs_dest->op_blockers)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2013 | } |
| 2014 | |
| 2015 | /* |
| 2016 | * Swap bs contents for two image chains while they are live, |
| 2017 | * while keeping required fields on the BlockDriverState that is |
| 2018 | * actually attached to a device. |
| 2019 | * |
| 2020 | * This will modify the BlockDriverState fields, and swap contents |
| 2021 | * between bs_new and bs_old. Both bs_new and bs_old are modified. |
| 2022 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2023 | * bs_new must not be attached to a BlockBackend. |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2024 | * |
| 2025 | * This function does not create any image files. |
| 2026 | */ |
| 2027 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) |
| 2028 | { |
| 2029 | BlockDriverState tmp; |
| 2030 | |
Benoît Canet | 90ce8a0 | 2014-03-05 23:48:29 +0100 | [diff] [blame] | 2031 | /* The code needs to swap the node_name but simply swapping node_list won't |
| 2032 | * work so first remove the nodes from the graph list, do the swap then |
| 2033 | * insert them back if needed. |
| 2034 | */ |
| 2035 | if (bs_new->node_name[0] != '\0') { |
| 2036 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); |
| 2037 | } |
| 2038 | if (bs_old->node_name[0] != '\0') { |
| 2039 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); |
| 2040 | } |
| 2041 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2042 | /* bs_new must be unattached and shouldn't have anything fancy enabled */ |
Markus Armbruster | 7e7d56d | 2014-10-07 13:59:05 +0200 | [diff] [blame] | 2043 | assert(!bs_new->blk); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2044 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2045 | assert(bs_new->job == NULL); |
| 2046 | assert(bs_new->dev == NULL); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2047 | assert(bs_new->io_limits_enabled == false); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 2048 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2049 | |
| 2050 | tmp = *bs_new; |
| 2051 | *bs_new = *bs_old; |
| 2052 | *bs_old = tmp; |
| 2053 | |
| 2054 | /* there are some fields that should not be swapped, move them back */ |
| 2055 | bdrv_move_feature_fields(&tmp, bs_old); |
| 2056 | bdrv_move_feature_fields(bs_old, bs_new); |
| 2057 | bdrv_move_feature_fields(bs_new, &tmp); |
| 2058 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2059 | /* bs_new must remain unattached */ |
Markus Armbruster | 7e7d56d | 2014-10-07 13:59:05 +0200 | [diff] [blame] | 2060 | assert(!bs_new->blk); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2061 | |
| 2062 | /* Check a few fields that should remain attached to the device */ |
| 2063 | assert(bs_new->dev == NULL); |
| 2064 | assert(bs_new->job == NULL); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2065 | assert(bs_new->io_limits_enabled == false); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 2066 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2067 | |
Benoît Canet | 90ce8a0 | 2014-03-05 23:48:29 +0100 | [diff] [blame] | 2068 | /* insert the nodes back into the graph node list if needed */ |
| 2069 | if (bs_new->node_name[0] != '\0') { |
| 2070 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); |
| 2071 | } |
| 2072 | if (bs_old->node_name[0] != '\0') { |
| 2073 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); |
| 2074 | } |
| 2075 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2076 | bdrv_rebind(bs_new); |
| 2077 | bdrv_rebind(bs_old); |
| 2078 | } |
| 2079 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2080 | /* |
| 2081 | * Add new bs contents at the top of an image chain while the chain is |
| 2082 | * live, while keeping required fields on the top layer. |
| 2083 | * |
| 2084 | * This will modify the BlockDriverState fields, and swap contents |
| 2085 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 2086 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2087 | * bs_new must not be attached to a BlockBackend. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 2088 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2089 | * This function does not create any image files. |
| 2090 | */ |
| 2091 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) |
| 2092 | { |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2093 | bdrv_swap(bs_new, bs_top); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2094 | |
| 2095 | /* The contents of 'tmp' will become bs_top, as we are |
| 2096 | * swapping bs_new and bs_top contents. */ |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2097 | bdrv_set_backing_hd(bs_top, bs_new); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2098 | } |
| 2099 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2100 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2101 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2102 | assert(!bs->dev); |
Paolo Bonzini | 3e91465 | 2012-03-30 13:17:11 +0200 | [diff] [blame] | 2103 | assert(!bs->job); |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 2104 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2105 | assert(!bs->refcnt); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2106 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2107 | |
Stefan Hajnoczi | e1b5c52 | 2013-06-27 15:32:26 +0200 | [diff] [blame] | 2108 | bdrv_close(bs); |
| 2109 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 2110 | /* remove from list, if necessary */ |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2111 | bdrv_make_anon(bs); |
aurel32 | 34c6f05 | 2008-04-08 19:51:21 +0000 | [diff] [blame] | 2112 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2113 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2114 | } |
| 2115 | |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2116 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
| 2117 | /* TODO change to DeviceState *dev when all users are qdevified */ |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2118 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2119 | if (bs->dev) { |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2120 | return -EBUSY; |
| 2121 | } |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2122 | bs->dev = dev; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 2123 | bdrv_iostatus_reset(bs); |
Stefan Hajnoczi | 2a87151 | 2014-07-07 15:15:53 +0200 | [diff] [blame] | 2124 | |
| 2125 | /* We're expecting I/O from the device so bump up coroutine pool size */ |
| 2126 | qemu_coroutine_adjust_pool_size(COROUTINE_POOL_RESERVATION); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2127 | return 0; |
| 2128 | } |
| 2129 | |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2130 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
| 2131 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2132 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2133 | if (bdrv_attach_dev(bs, dev) < 0) { |
| 2134 | abort(); |
| 2135 | } |
| 2136 | } |
| 2137 | |
| 2138 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) |
| 2139 | /* TODO change to DeviceState *dev when all users are qdevified */ |
| 2140 | { |
| 2141 | assert(bs->dev == dev); |
| 2142 | bs->dev = NULL; |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2143 | bs->dev_ops = NULL; |
| 2144 | bs->dev_opaque = NULL; |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 2145 | bs->guest_block_size = 512; |
Stefan Hajnoczi | 2a87151 | 2014-07-07 15:15:53 +0200 | [diff] [blame] | 2146 | qemu_coroutine_adjust_pool_size(-COROUTINE_POOL_RESERVATION); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2147 | } |
| 2148 | |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2149 | /* TODO change to return DeviceState * when all users are qdevified */ |
| 2150 | void *bdrv_get_attached_dev(BlockDriverState *bs) |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2151 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2152 | return bs->dev; |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2153 | } |
| 2154 | |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2155 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
| 2156 | void *opaque) |
| 2157 | { |
| 2158 | bs->dev_ops = ops; |
| 2159 | bs->dev_opaque = opaque; |
| 2160 | } |
| 2161 | |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 2162 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2163 | { |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 2164 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2165 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 2166 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2167 | if (tray_was_closed) { |
| 2168 | /* tray open */ |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 2169 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
| 2170 | true, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2171 | } |
| 2172 | if (load) { |
| 2173 | /* tray close */ |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 2174 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
| 2175 | false, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2176 | } |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 2177 | } |
| 2178 | } |
| 2179 | |
Markus Armbruster | 2c6942f | 2011-09-06 18:58:51 +0200 | [diff] [blame] | 2180 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
| 2181 | { |
| 2182 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); |
| 2183 | } |
| 2184 | |
Paolo Bonzini | 025ccaa | 2011-11-07 17:50:13 +0100 | [diff] [blame] | 2185 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
| 2186 | { |
| 2187 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { |
| 2188 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); |
| 2189 | } |
| 2190 | } |
| 2191 | |
Markus Armbruster | e4def80 | 2011-09-06 18:58:53 +0200 | [diff] [blame] | 2192 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
| 2193 | { |
| 2194 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { |
| 2195 | return bs->dev_ops->is_tray_open(bs->dev_opaque); |
| 2196 | } |
| 2197 | return false; |
| 2198 | } |
| 2199 | |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 2200 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
| 2201 | { |
| 2202 | if (bs->dev_ops && bs->dev_ops->resize_cb) { |
| 2203 | bs->dev_ops->resize_cb(bs->dev_opaque); |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2204 | } |
| 2205 | } |
| 2206 | |
Markus Armbruster | f107639 | 2011-09-06 18:58:46 +0200 | [diff] [blame] | 2207 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
| 2208 | { |
| 2209 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { |
| 2210 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); |
| 2211 | } |
| 2212 | return false; |
| 2213 | } |
| 2214 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2215 | /* |
| 2216 | * Run consistency checks on an image |
| 2217 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2218 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
Stefan Weil | a1c7273 | 2011-04-28 17:20:38 +0200 | [diff] [blame] | 2219 | * free of errors) or -errno when an internal error occurred. The results of the |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2220 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2221 | */ |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2222 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2223 | { |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 2224 | if (bs->drv == NULL) { |
| 2225 | return -ENOMEDIUM; |
| 2226 | } |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2227 | if (bs->drv->bdrv_check == NULL) { |
| 2228 | return -ENOTSUP; |
| 2229 | } |
| 2230 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2231 | memset(res, 0, sizeof(*res)); |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2232 | return bs->drv->bdrv_check(bs, res, fix); |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2233 | } |
| 2234 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2235 | #define COMMIT_BUF_SECTORS 2048 |
| 2236 | |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2237 | /* commit COW file into the raw image */ |
| 2238 | int bdrv_commit(BlockDriverState *bs) |
| 2239 | { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2240 | BlockDriver *drv = bs->drv; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2241 | int64_t sector, total_sectors, length, backing_length; |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2242 | int n, ro, open_flags; |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2243 | int ret = 0; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2244 | uint8_t *buf = NULL; |
Jim Meyering | c2cba3d | 2012-10-04 13:09:46 +0200 | [diff] [blame] | 2245 | char filename[PATH_MAX]; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2246 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2247 | if (!drv) |
| 2248 | return -ENOMEDIUM; |
Liu Yuan | 6bb4515 | 2014-09-01 13:35:21 +0800 | [diff] [blame] | 2249 | |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2250 | if (!bs->backing_hd) { |
| 2251 | return -ENOTSUP; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2252 | } |
| 2253 | |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 2254 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, NULL) || |
| 2255 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, NULL)) { |
Stefan Hajnoczi | 2d3735d | 2012-01-18 14:40:41 +0000 | [diff] [blame] | 2256 | return -EBUSY; |
| 2257 | } |
| 2258 | |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2259 | ro = bs->backing_hd->read_only; |
Jim Meyering | c2cba3d | 2012-10-04 13:09:46 +0200 | [diff] [blame] | 2260 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
| 2261 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2262 | open_flags = bs->backing_hd->open_flags; |
| 2263 | |
| 2264 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2265 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
| 2266 | return -EACCES; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2267 | } |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2268 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2269 | |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2270 | length = bdrv_getlength(bs); |
| 2271 | if (length < 0) { |
| 2272 | ret = length; |
| 2273 | goto ro_cleanup; |
| 2274 | } |
| 2275 | |
| 2276 | backing_length = bdrv_getlength(bs->backing_hd); |
| 2277 | if (backing_length < 0) { |
| 2278 | ret = backing_length; |
| 2279 | goto ro_cleanup; |
| 2280 | } |
| 2281 | |
| 2282 | /* If our top snapshot is larger than the backing file image, |
| 2283 | * grow the backing file image if possible. If not possible, |
| 2284 | * we must return an error */ |
| 2285 | if (length > backing_length) { |
| 2286 | ret = bdrv_truncate(bs->backing_hd, length); |
| 2287 | if (ret < 0) { |
| 2288 | goto ro_cleanup; |
| 2289 | } |
| 2290 | } |
| 2291 | |
| 2292 | total_sectors = length >> BDRV_SECTOR_BITS; |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2293 | |
| 2294 | /* qemu_try_blockalign() for bs will choose an alignment that works for |
| 2295 | * bs->backing_hd as well, so no need to compare the alignment manually. */ |
| 2296 | buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
| 2297 | if (buf == NULL) { |
| 2298 | ret = -ENOMEM; |
| 2299 | goto ro_cleanup; |
| 2300 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2301 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2302 | for (sector = 0; sector < total_sectors; sector += n) { |
Paolo Bonzini | d663640 | 2013-09-04 19:00:25 +0200 | [diff] [blame] | 2303 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
| 2304 | if (ret < 0) { |
| 2305 | goto ro_cleanup; |
| 2306 | } |
| 2307 | if (ret) { |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2308 | ret = bdrv_read(bs, sector, buf, n); |
| 2309 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2310 | goto ro_cleanup; |
| 2311 | } |
| 2312 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2313 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
| 2314 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2315 | goto ro_cleanup; |
| 2316 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2317 | } |
| 2318 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2319 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2320 | if (drv->bdrv_make_empty) { |
| 2321 | ret = drv->bdrv_make_empty(bs); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2322 | if (ret < 0) { |
| 2323 | goto ro_cleanup; |
| 2324 | } |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2325 | bdrv_flush(bs); |
| 2326 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2327 | |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2328 | /* |
| 2329 | * Make sure all data we wrote to the backing device is actually |
| 2330 | * stable on disk. |
| 2331 | */ |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2332 | if (bs->backing_hd) { |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2333 | bdrv_flush(bs->backing_hd); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2334 | } |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2335 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2336 | ret = 0; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2337 | ro_cleanup: |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2338 | qemu_vfree(buf); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2339 | |
| 2340 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2341 | /* ignoring error return here */ |
| 2342 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2343 | } |
| 2344 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2345 | return ret; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2346 | } |
| 2347 | |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2348 | int bdrv_commit_all(void) |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2349 | { |
| 2350 | BlockDriverState *bs; |
| 2351 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2352 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2353 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 2354 | |
| 2355 | aio_context_acquire(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2356 | if (bs->drv && bs->backing_hd) { |
| 2357 | int ret = bdrv_commit(bs); |
| 2358 | if (ret < 0) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2359 | aio_context_release(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2360 | return ret; |
| 2361 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2362 | } |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2363 | aio_context_release(aio_context); |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2364 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2365 | return 0; |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2366 | } |
| 2367 | |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2368 | /** |
| 2369 | * Remove an active request from the tracked requests list |
| 2370 | * |
| 2371 | * This function should be called when a tracked request is completing. |
| 2372 | */ |
| 2373 | static void tracked_request_end(BdrvTrackedRequest *req) |
| 2374 | { |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2375 | if (req->serialising) { |
| 2376 | req->bs->serialising_in_flight--; |
| 2377 | } |
| 2378 | |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2379 | QLIST_REMOVE(req, list); |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2380 | qemu_co_queue_restart_all(&req->wait_queue); |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2381 | } |
| 2382 | |
| 2383 | /** |
| 2384 | * Add an active request to the tracked requests list |
| 2385 | */ |
| 2386 | static void tracked_request_begin(BdrvTrackedRequest *req, |
| 2387 | BlockDriverState *bs, |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2388 | int64_t offset, |
| 2389 | unsigned int bytes, bool is_write) |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2390 | { |
| 2391 | *req = (BdrvTrackedRequest){ |
| 2392 | .bs = bs, |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2393 | .offset = offset, |
| 2394 | .bytes = bytes, |
| 2395 | .is_write = is_write, |
| 2396 | .co = qemu_coroutine_self(), |
| 2397 | .serialising = false, |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2398 | .overlap_offset = offset, |
| 2399 | .overlap_bytes = bytes, |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2400 | }; |
| 2401 | |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2402 | qemu_co_queue_init(&req->wait_queue); |
| 2403 | |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2404 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
| 2405 | } |
| 2406 | |
Kevin Wolf | e96126f | 2014-02-08 10:42:18 +0100 | [diff] [blame] | 2407 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2408 | { |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2409 | int64_t overlap_offset = req->offset & ~(align - 1); |
Kevin Wolf | e96126f | 2014-02-08 10:42:18 +0100 | [diff] [blame] | 2410 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
| 2411 | - overlap_offset; |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2412 | |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2413 | if (!req->serialising) { |
| 2414 | req->bs->serialising_in_flight++; |
| 2415 | req->serialising = true; |
| 2416 | } |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2417 | |
| 2418 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); |
| 2419 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2420 | } |
| 2421 | |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2422 | /** |
| 2423 | * Round a region to cluster boundaries |
| 2424 | */ |
Paolo Bonzini | 343bded | 2013-01-21 17:09:42 +0100 | [diff] [blame] | 2425 | void bdrv_round_to_clusters(BlockDriverState *bs, |
| 2426 | int64_t sector_num, int nb_sectors, |
| 2427 | int64_t *cluster_sector_num, |
| 2428 | int *cluster_nb_sectors) |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2429 | { |
| 2430 | BlockDriverInfo bdi; |
| 2431 | |
| 2432 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { |
| 2433 | *cluster_sector_num = sector_num; |
| 2434 | *cluster_nb_sectors = nb_sectors; |
| 2435 | } else { |
| 2436 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; |
| 2437 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); |
| 2438 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + |
| 2439 | nb_sectors, c); |
| 2440 | } |
| 2441 | } |
| 2442 | |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2443 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2444 | { |
| 2445 | BlockDriverInfo bdi; |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2446 | int ret; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2447 | |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2448 | ret = bdrv_get_info(bs, &bdi); |
| 2449 | if (ret < 0 || bdi.cluster_size == 0) { |
| 2450 | return bs->request_alignment; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2451 | } else { |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2452 | return bdi.cluster_size; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2453 | } |
| 2454 | } |
| 2455 | |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2456 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2457 | int64_t offset, unsigned int bytes) |
| 2458 | { |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2459 | /* aaaa bbbb */ |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2460 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2461 | return false; |
| 2462 | } |
| 2463 | /* bbbb aaaa */ |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2464 | if (req->overlap_offset >= offset + bytes) { |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2465 | return false; |
| 2466 | } |
| 2467 | return true; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2468 | } |
| 2469 | |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2470 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2471 | { |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2472 | BlockDriverState *bs = self->bs; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2473 | BdrvTrackedRequest *req; |
| 2474 | bool retry; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2475 | bool waited = false; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2476 | |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2477 | if (!bs->serialising_in_flight) { |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2478 | return false; |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2479 | } |
| 2480 | |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2481 | do { |
| 2482 | retry = false; |
| 2483 | QLIST_FOREACH(req, &bs->tracked_requests, list) { |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2484 | if (req == self || (!req->serialising && !self->serialising)) { |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 2485 | continue; |
| 2486 | } |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2487 | if (tracked_request_overlaps(req, self->overlap_offset, |
| 2488 | self->overlap_bytes)) |
| 2489 | { |
Stefan Hajnoczi | 5f8b649 | 2011-11-30 12:23:42 +0000 | [diff] [blame] | 2490 | /* Hitting this means there was a reentrant request, for |
| 2491 | * example, a block driver issuing nested requests. This must |
| 2492 | * never happen since it means deadlock. |
| 2493 | */ |
| 2494 | assert(qemu_coroutine_self() != req->co); |
| 2495 | |
Kevin Wolf | 6460440 | 2013-12-13 13:04:35 +0100 | [diff] [blame] | 2496 | /* If the request is already (indirectly) waiting for us, or |
| 2497 | * will wait for us as soon as it wakes up, then just go on |
| 2498 | * (instead of producing a deadlock in the former case). */ |
| 2499 | if (!req->waiting_for) { |
| 2500 | self->waiting_for = req; |
| 2501 | qemu_co_queue_wait(&req->wait_queue); |
| 2502 | self->waiting_for = NULL; |
| 2503 | retry = true; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2504 | waited = true; |
Kevin Wolf | 6460440 | 2013-12-13 13:04:35 +0100 | [diff] [blame] | 2505 | break; |
| 2506 | } |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2507 | } |
| 2508 | } |
| 2509 | } while (retry); |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2510 | |
| 2511 | return waited; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2512 | } |
| 2513 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2514 | /* |
| 2515 | * Return values: |
| 2516 | * 0 - success |
| 2517 | * -EINVAL - backing format specified, but no file |
| 2518 | * -ENOSPC - can't update the backing file because no space is left in the |
| 2519 | * image file header |
| 2520 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 2521 | */ |
| 2522 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 2523 | const char *backing_file, const char *backing_fmt) |
| 2524 | { |
| 2525 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2526 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2527 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 2528 | /* Backing file format doesn't make sense without a backing file */ |
| 2529 | if (backing_fmt && !backing_file) { |
| 2530 | return -EINVAL; |
| 2531 | } |
| 2532 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2533 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2534 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2535 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2536 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2537 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2538 | |
| 2539 | if (ret == 0) { |
| 2540 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 2541 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
| 2542 | } |
| 2543 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2544 | } |
| 2545 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2546 | /* |
| 2547 | * Finds the image layer in the chain that has 'bs' as its backing file. |
| 2548 | * |
| 2549 | * active is the current topmost image. |
| 2550 | * |
| 2551 | * Returns NULL if bs is not found in active's image chain, |
| 2552 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2553 | * |
| 2554 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2555 | */ |
| 2556 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 2557 | BlockDriverState *bs) |
| 2558 | { |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2559 | while (active && bs != active->backing_hd) { |
| 2560 | active = active->backing_hd; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2561 | } |
| 2562 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2563 | return active; |
| 2564 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2565 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2566 | /* Given a BDS, searches for the base layer. */ |
| 2567 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 2568 | { |
| 2569 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2570 | } |
| 2571 | |
| 2572 | typedef struct BlkIntermediateStates { |
| 2573 | BlockDriverState *bs; |
| 2574 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; |
| 2575 | } BlkIntermediateStates; |
| 2576 | |
| 2577 | |
| 2578 | /* |
| 2579 | * Drops images above 'base' up to and including 'top', and sets the image |
| 2580 | * above 'top' to have base as its backing file. |
| 2581 | * |
| 2582 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 2583 | * information in 'bs' can be properly updated. |
| 2584 | * |
| 2585 | * E.g., this will convert the following chain: |
| 2586 | * bottom <- base <- intermediate <- top <- active |
| 2587 | * |
| 2588 | * to |
| 2589 | * |
| 2590 | * bottom <- base <- active |
| 2591 | * |
| 2592 | * It is allowed for bottom==base, in which case it converts: |
| 2593 | * |
| 2594 | * base <- intermediate <- top <- active |
| 2595 | * |
| 2596 | * to |
| 2597 | * |
| 2598 | * base <- active |
| 2599 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2600 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 2601 | * overlay image metadata. |
| 2602 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2603 | * Error conditions: |
| 2604 | * if active == top, that is considered an error |
| 2605 | * |
| 2606 | */ |
| 2607 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2608 | BlockDriverState *base, const char *backing_file_str) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2609 | { |
| 2610 | BlockDriverState *intermediate; |
| 2611 | BlockDriverState *base_bs = NULL; |
| 2612 | BlockDriverState *new_top_bs = NULL; |
| 2613 | BlkIntermediateStates *intermediate_state, *next; |
| 2614 | int ret = -EIO; |
| 2615 | |
| 2616 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; |
| 2617 | QSIMPLEQ_INIT(&states_to_delete); |
| 2618 | |
| 2619 | if (!top->drv || !base->drv) { |
| 2620 | goto exit; |
| 2621 | } |
| 2622 | |
| 2623 | new_top_bs = bdrv_find_overlay(active, top); |
| 2624 | |
| 2625 | if (new_top_bs == NULL) { |
| 2626 | /* we could not find the image above 'top', this is an error */ |
| 2627 | goto exit; |
| 2628 | } |
| 2629 | |
| 2630 | /* special case of new_top_bs->backing_hd already pointing to base - nothing |
| 2631 | * to do, no intermediate images */ |
| 2632 | if (new_top_bs->backing_hd == base) { |
| 2633 | ret = 0; |
| 2634 | goto exit; |
| 2635 | } |
| 2636 | |
| 2637 | intermediate = top; |
| 2638 | |
| 2639 | /* now we will go down through the list, and add each BDS we find |
| 2640 | * into our deletion queue, until we hit the 'base' |
| 2641 | */ |
| 2642 | while (intermediate) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 2643 | intermediate_state = g_new0(BlkIntermediateStates, 1); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2644 | intermediate_state->bs = intermediate; |
| 2645 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); |
| 2646 | |
| 2647 | if (intermediate->backing_hd == base) { |
| 2648 | base_bs = intermediate->backing_hd; |
| 2649 | break; |
| 2650 | } |
| 2651 | intermediate = intermediate->backing_hd; |
| 2652 | } |
| 2653 | if (base_bs == NULL) { |
| 2654 | /* something went wrong, we did not end at the base. safely |
| 2655 | * unravel everything, and exit with error */ |
| 2656 | goto exit; |
| 2657 | } |
| 2658 | |
| 2659 | /* success - we can delete the intermediate states, and link top->base */ |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2660 | backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; |
| 2661 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2662 | base_bs->drv ? base_bs->drv->format_name : ""); |
| 2663 | if (ret) { |
| 2664 | goto exit; |
| 2665 | } |
Fam Zheng | 920beae | 2014-05-23 21:29:46 +0800 | [diff] [blame] | 2666 | bdrv_set_backing_hd(new_top_bs, base_bs); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2667 | |
| 2668 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { |
| 2669 | /* so that bdrv_close() does not recursively close the chain */ |
Fam Zheng | 920beae | 2014-05-23 21:29:46 +0800 | [diff] [blame] | 2670 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2671 | bdrv_unref(intermediate_state->bs); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2672 | } |
| 2673 | ret = 0; |
| 2674 | |
| 2675 | exit: |
| 2676 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { |
| 2677 | g_free(intermediate_state); |
| 2678 | } |
| 2679 | return ret; |
| 2680 | } |
| 2681 | |
| 2682 | |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2683 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 2684 | size_t size) |
| 2685 | { |
| 2686 | int64_t len; |
| 2687 | |
Kevin Wolf | 1dd3a44 | 2014-04-14 14:48:16 +0200 | [diff] [blame] | 2688 | if (size > INT_MAX) { |
| 2689 | return -EIO; |
| 2690 | } |
| 2691 | |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2692 | if (!bdrv_is_inserted(bs)) |
| 2693 | return -ENOMEDIUM; |
| 2694 | |
| 2695 | if (bs->growable) |
| 2696 | return 0; |
| 2697 | |
| 2698 | len = bdrv_getlength(bs); |
| 2699 | |
Kevin Wolf | fbb7b4e | 2009-05-08 14:47:24 +0200 | [diff] [blame] | 2700 | if (offset < 0) |
| 2701 | return -EIO; |
| 2702 | |
| 2703 | if ((offset > len) || (len - offset < size)) |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2704 | return -EIO; |
| 2705 | |
| 2706 | return 0; |
| 2707 | } |
| 2708 | |
| 2709 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 2710 | int nb_sectors) |
| 2711 | { |
Kevin Wolf | 54db38a | 2014-04-14 14:47:14 +0200 | [diff] [blame] | 2712 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
Kevin Wolf | 8f4754e | 2014-03-26 13:06:02 +0100 | [diff] [blame] | 2713 | return -EIO; |
| 2714 | } |
| 2715 | |
Jes Sorensen | eb5a316 | 2010-05-27 16:20:31 +0200 | [diff] [blame] | 2716 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
| 2717 | nb_sectors * BDRV_SECTOR_SIZE); |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2718 | } |
| 2719 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2720 | typedef struct RwCo { |
| 2721 | BlockDriverState *bs; |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2722 | int64_t offset; |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2723 | QEMUIOVector *qiov; |
| 2724 | bool is_write; |
| 2725 | int ret; |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2726 | BdrvRequestFlags flags; |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2727 | } RwCo; |
| 2728 | |
| 2729 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) |
| 2730 | { |
| 2731 | RwCo *rwco = opaque; |
| 2732 | |
| 2733 | if (!rwco->is_write) { |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2734 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
| 2735 | rwco->qiov->size, rwco->qiov, |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2736 | rwco->flags); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2737 | } else { |
| 2738 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, |
| 2739 | rwco->qiov->size, rwco->qiov, |
| 2740 | rwco->flags); |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2741 | } |
| 2742 | } |
| 2743 | |
| 2744 | /* |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2745 | * Process a vectored synchronous request using coroutines |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2746 | */ |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2747 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
| 2748 | QEMUIOVector *qiov, bool is_write, |
| 2749 | BdrvRequestFlags flags) |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2750 | { |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2751 | Coroutine *co; |
| 2752 | RwCo rwco = { |
| 2753 | .bs = bs, |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2754 | .offset = offset, |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2755 | .qiov = qiov, |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2756 | .is_write = is_write, |
| 2757 | .ret = NOT_DONE, |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2758 | .flags = flags, |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2759 | }; |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2760 | |
Zhi Yong Wu | 498e386 | 2012-04-02 18:59:34 +0800 | [diff] [blame] | 2761 | /** |
| 2762 | * In sync call context, when the vcpu is blocked, this throttling timer |
| 2763 | * will not fire; so the I/O throttling function has to be disabled here |
| 2764 | * if it has been enabled. |
| 2765 | */ |
| 2766 | if (bs->io_limits_enabled) { |
| 2767 | fprintf(stderr, "Disabling I/O throttling on '%s' due " |
| 2768 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); |
| 2769 | bdrv_io_limits_disable(bs); |
| 2770 | } |
| 2771 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2772 | if (qemu_in_coroutine()) { |
| 2773 | /* Fast-path if already in coroutine context */ |
| 2774 | bdrv_rw_co_entry(&rwco); |
| 2775 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 2776 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 2777 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2778 | co = qemu_coroutine_create(bdrv_rw_co_entry); |
| 2779 | qemu_coroutine_enter(co, &rwco); |
| 2780 | while (rwco.ret == NOT_DONE) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 2781 | aio_poll(aio_context, true); |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2782 | } |
| 2783 | } |
| 2784 | return rwco.ret; |
| 2785 | } |
| 2786 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2787 | /* |
| 2788 | * Process a synchronous request using coroutines |
| 2789 | */ |
| 2790 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2791 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2792 | { |
| 2793 | QEMUIOVector qiov; |
| 2794 | struct iovec iov = { |
| 2795 | .iov_base = (void *)buf, |
| 2796 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, |
| 2797 | }; |
| 2798 | |
Kevin Wolf | da15ee5 | 2014-04-14 15:39:36 +0200 | [diff] [blame] | 2799 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
| 2800 | return -EINVAL; |
| 2801 | } |
| 2802 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2803 | qemu_iovec_init_external(&qiov, &iov, 1); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2804 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
| 2805 | &qiov, is_write, flags); |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2806 | } |
| 2807 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2808 | /* return < 0 if error. See bdrv_write() for the return codes */ |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2809 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2810 | uint8_t *buf, int nb_sectors) |
| 2811 | { |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2812 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2813 | } |
| 2814 | |
Markus Armbruster | 07d27a4 | 2012-06-29 17:34:29 +0200 | [diff] [blame] | 2815 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
| 2816 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, |
| 2817 | uint8_t *buf, int nb_sectors) |
| 2818 | { |
| 2819 | bool enabled; |
| 2820 | int ret; |
| 2821 | |
| 2822 | enabled = bs->io_limits_enabled; |
| 2823 | bs->io_limits_enabled = false; |
Peter Lieven | 4e7395e | 2013-07-18 10:37:32 +0200 | [diff] [blame] | 2824 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
Markus Armbruster | 07d27a4 | 2012-06-29 17:34:29 +0200 | [diff] [blame] | 2825 | bs->io_limits_enabled = enabled; |
| 2826 | return ret; |
| 2827 | } |
| 2828 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2829 | /* Return < 0 if error. Important errors are: |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2830 | -EIO generic I/O error (may happen for all errors) |
| 2831 | -ENOMEDIUM No media inserted. |
| 2832 | -EINVAL Invalid sector number or nb_sectors |
| 2833 | -EACCES Trying to write a read-only device |
| 2834 | */ |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2835 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2836 | const uint8_t *buf, int nb_sectors) |
| 2837 | { |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2838 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2839 | } |
| 2840 | |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 2841 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
| 2842 | int nb_sectors, BdrvRequestFlags flags) |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2843 | { |
| 2844 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 2845 | BDRV_REQ_ZERO_WRITE | flags); |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2846 | } |
| 2847 | |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2848 | /* |
| 2849 | * Completely zero out a block device with the help of bdrv_write_zeroes. |
| 2850 | * The operation is sped up by checking the block status and only writing |
| 2851 | * zeroes to the device if they currently do not return zeroes. Optional |
| 2852 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). |
| 2853 | * |
| 2854 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). |
| 2855 | */ |
| 2856 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) |
| 2857 | { |
Markus Armbruster | d32f7c1 | 2014-06-26 13:23:18 +0200 | [diff] [blame] | 2858 | int64_t target_sectors, ret, nb_sectors, sector_num = 0; |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2859 | int n; |
| 2860 | |
Markus Armbruster | d32f7c1 | 2014-06-26 13:23:18 +0200 | [diff] [blame] | 2861 | target_sectors = bdrv_nb_sectors(bs); |
| 2862 | if (target_sectors < 0) { |
| 2863 | return target_sectors; |
Kevin Wolf | 9ce10c0 | 2014-04-14 17:03:34 +0200 | [diff] [blame] | 2864 | } |
Kevin Wolf | 9ce10c0 | 2014-04-14 17:03:34 +0200 | [diff] [blame] | 2865 | |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2866 | for (;;) { |
Markus Armbruster | d32f7c1 | 2014-06-26 13:23:18 +0200 | [diff] [blame] | 2867 | nb_sectors = target_sectors - sector_num; |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2868 | if (nb_sectors <= 0) { |
| 2869 | return 0; |
| 2870 | } |
| 2871 | if (nb_sectors > INT_MAX) { |
| 2872 | nb_sectors = INT_MAX; |
| 2873 | } |
| 2874 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); |
Peter Lieven | 3d94ce6 | 2013-12-12 13:57:05 +0100 | [diff] [blame] | 2875 | if (ret < 0) { |
| 2876 | error_report("error getting block status at sector %" PRId64 ": %s", |
| 2877 | sector_num, strerror(-ret)); |
| 2878 | return ret; |
| 2879 | } |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2880 | if (ret & BDRV_BLOCK_ZERO) { |
| 2881 | sector_num += n; |
| 2882 | continue; |
| 2883 | } |
| 2884 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); |
| 2885 | if (ret < 0) { |
| 2886 | error_report("error writing zeroes at sector %" PRId64 ": %s", |
| 2887 | sector_num, strerror(-ret)); |
| 2888 | return ret; |
| 2889 | } |
| 2890 | sector_num += n; |
| 2891 | } |
| 2892 | } |
| 2893 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2894 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2895 | { |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2896 | QEMUIOVector qiov; |
| 2897 | struct iovec iov = { |
| 2898 | .iov_base = (void *)buf, |
| 2899 | .iov_len = bytes, |
| 2900 | }; |
Kevin Wolf | 9a8c4cc | 2010-01-20 15:03:02 +0100 | [diff] [blame] | 2901 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2902 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2903 | if (bytes < 0) { |
| 2904 | return -EINVAL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2905 | } |
| 2906 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2907 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 2908 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); |
| 2909 | if (ret < 0) { |
| 2910 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2911 | } |
| 2912 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2913 | return bytes; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2914 | } |
| 2915 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2916 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2917 | { |
Kevin Wolf | 9a8c4cc | 2010-01-20 15:03:02 +0100 | [diff] [blame] | 2918 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2919 | |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2920 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
| 2921 | if (ret < 0) { |
| 2922 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2923 | } |
| 2924 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2925 | return qiov->size; |
| 2926 | } |
| 2927 | |
| 2928 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2929 | const void *buf, int bytes) |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2930 | { |
| 2931 | QEMUIOVector qiov; |
| 2932 | struct iovec iov = { |
| 2933 | .iov_base = (void *) buf, |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2934 | .iov_len = bytes, |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2935 | }; |
| 2936 | |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2937 | if (bytes < 0) { |
| 2938 | return -EINVAL; |
| 2939 | } |
| 2940 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2941 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 2942 | return bdrv_pwritev(bs, offset, &qiov); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2943 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2944 | |
Kevin Wolf | f08145f | 2010-06-16 16:38:15 +0200 | [diff] [blame] | 2945 | /* |
| 2946 | * Writes to the file and ensures that no writes are reordered across this |
| 2947 | * request (acts as a barrier) |
| 2948 | * |
| 2949 | * Returns 0 on success, -errno in error cases. |
| 2950 | */ |
| 2951 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, |
| 2952 | const void *buf, int count) |
| 2953 | { |
| 2954 | int ret; |
| 2955 | |
| 2956 | ret = bdrv_pwrite(bs, offset, buf, count); |
| 2957 | if (ret < 0) { |
| 2958 | return ret; |
| 2959 | } |
| 2960 | |
Paolo Bonzini | f05fa4a | 2012-06-06 00:04:49 +0200 | [diff] [blame] | 2961 | /* No flush needed for cache modes that already do it */ |
| 2962 | if (bs->enable_write_cache) { |
Kevin Wolf | f08145f | 2010-06-16 16:38:15 +0200 | [diff] [blame] | 2963 | bdrv_flush(bs); |
| 2964 | } |
| 2965 | |
| 2966 | return 0; |
| 2967 | } |
| 2968 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 2969 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2970 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
| 2971 | { |
| 2972 | /* Perform I/O through a temporary buffer so that users who scribble over |
| 2973 | * their read buffer while the operation is in progress do not end up |
| 2974 | * modifying the image file. This is critical for zero-copy guest I/O |
| 2975 | * where anything might happen inside guest memory. |
| 2976 | */ |
| 2977 | void *bounce_buffer; |
| 2978 | |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2979 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2980 | struct iovec iov; |
| 2981 | QEMUIOVector bounce_qiov; |
| 2982 | int64_t cluster_sector_num; |
| 2983 | int cluster_nb_sectors; |
| 2984 | size_t skip_bytes; |
| 2985 | int ret; |
| 2986 | |
| 2987 | /* Cover entire cluster so no additional backing file I/O is required when |
| 2988 | * allocating cluster in the image file. |
| 2989 | */ |
Paolo Bonzini | 343bded | 2013-01-21 17:09:42 +0100 | [diff] [blame] | 2990 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
| 2991 | &cluster_sector_num, &cluster_nb_sectors); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2992 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 2993 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
| 2994 | cluster_sector_num, cluster_nb_sectors); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2995 | |
| 2996 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2997 | iov.iov_base = bounce_buffer = qemu_try_blockalign(bs, iov.iov_len); |
| 2998 | if (bounce_buffer == NULL) { |
| 2999 | ret = -ENOMEM; |
| 3000 | goto err; |
| 3001 | } |
| 3002 | |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3003 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
| 3004 | |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 3005 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
| 3006 | &bounce_qiov); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3007 | if (ret < 0) { |
| 3008 | goto err; |
| 3009 | } |
| 3010 | |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 3011 | if (drv->bdrv_co_write_zeroes && |
| 3012 | buffer_is_zero(bounce_buffer, iov.iov_len)) { |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3013 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3014 | cluster_nb_sectors, 0); |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 3015 | } else { |
Paolo Bonzini | f05fa4a | 2012-06-06 00:04:49 +0200 | [diff] [blame] | 3016 | /* This does not change the data on the disk, it is not necessary |
| 3017 | * to flush even in cache=writethrough mode. |
| 3018 | */ |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 3019 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3020 | &bounce_qiov); |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 3021 | } |
| 3022 | |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3023 | if (ret < 0) { |
| 3024 | /* It might be okay to ignore write errors for guest requests. If this |
| 3025 | * is a deliberate copy-on-read then we don't want to ignore the error. |
| 3026 | * Simply report it in all cases. |
| 3027 | */ |
| 3028 | goto err; |
| 3029 | } |
| 3030 | |
| 3031 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; |
Michael Tokarev | 0339614 | 2012-06-07 20:17:55 +0400 | [diff] [blame] | 3032 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
| 3033 | nb_sectors * BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3034 | |
| 3035 | err: |
| 3036 | qemu_vfree(bounce_buffer); |
| 3037 | return ret; |
| 3038 | } |
| 3039 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3040 | /* |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3041 | * Forwards an already correctly aligned request to the BlockDriver. This |
| 3042 | * handles copy on read and zeroing after EOF; any other features must be |
| 3043 | * implemented by the caller. |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3044 | */ |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3045 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3046 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
Kevin Wolf | ec746e1 | 2013-12-04 12:13:10 +0100 | [diff] [blame] | 3047 | int64_t align, QEMUIOVector *qiov, int flags) |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3048 | { |
| 3049 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 3050 | int ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3051 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3052 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
| 3053 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3054 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3055 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 3056 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); |
Kevin Wolf | 8eb029c | 2014-07-01 16:09:54 +0200 | [diff] [blame] | 3057 | assert(!qiov || bytes == qiov->size); |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3058 | |
| 3059 | /* Handle Copy on Read and associated serialisation */ |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3060 | if (flags & BDRV_REQ_COPY_ON_READ) { |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 3061 | /* If we touch the same cluster it counts as an overlap. This |
| 3062 | * guarantees that allocating writes will be serialized and not race |
| 3063 | * with each other for the same cluster. For example, in copy-on-read |
| 3064 | * it ensures that the CoR read and write operations are atomic and |
| 3065 | * guest writes cannot interleave between them. */ |
| 3066 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3067 | } |
| 3068 | |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 3069 | wait_serialising_requests(req); |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 3070 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3071 | if (flags & BDRV_REQ_COPY_ON_READ) { |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3072 | int pnum; |
| 3073 | |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 3074 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3075 | if (ret < 0) { |
| 3076 | goto out; |
| 3077 | } |
| 3078 | |
| 3079 | if (!ret || pnum != nb_sectors) { |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3080 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3081 | goto out; |
| 3082 | } |
| 3083 | } |
| 3084 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3085 | /* Forward the request to the BlockDriver */ |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3086 | if (!(bs->zero_beyond_eof && bs->growable)) { |
| 3087 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
| 3088 | } else { |
| 3089 | /* Read zeros after EOF of growable BDSes */ |
Markus Armbruster | 4049082 | 2014-06-26 13:23:19 +0200 | [diff] [blame] | 3090 | int64_t total_sectors, max_nb_sectors; |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3091 | |
Markus Armbruster | 4049082 | 2014-06-26 13:23:19 +0200 | [diff] [blame] | 3092 | total_sectors = bdrv_nb_sectors(bs); |
| 3093 | if (total_sectors < 0) { |
| 3094 | ret = total_sectors; |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3095 | goto out; |
| 3096 | } |
| 3097 | |
Kevin Wolf | 5f5bcd8 | 2014-02-07 16:00:09 +0100 | [diff] [blame] | 3098 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
| 3099 | align >> BDRV_SECTOR_BITS); |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3100 | if (max_nb_sectors > 0) { |
Kevin Wolf | 33f461e | 2014-07-03 13:21:24 +0200 | [diff] [blame] | 3101 | QEMUIOVector local_qiov; |
| 3102 | size_t local_sectors; |
| 3103 | |
| 3104 | max_nb_sectors = MIN(max_nb_sectors, SIZE_MAX / BDRV_SECTOR_BITS); |
| 3105 | local_sectors = MIN(max_nb_sectors, nb_sectors); |
| 3106 | |
| 3107 | qemu_iovec_init(&local_qiov, qiov->niov); |
| 3108 | qemu_iovec_concat(&local_qiov, qiov, 0, |
| 3109 | local_sectors * BDRV_SECTOR_SIZE); |
| 3110 | |
| 3111 | ret = drv->bdrv_co_readv(bs, sector_num, local_sectors, |
| 3112 | &local_qiov); |
| 3113 | |
| 3114 | qemu_iovec_destroy(&local_qiov); |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3115 | } else { |
| 3116 | ret = 0; |
| 3117 | } |
| 3118 | |
| 3119 | /* Reading beyond end of file is supposed to produce zeroes */ |
| 3120 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { |
| 3121 | uint64_t offset = MAX(0, total_sectors - sector_num); |
| 3122 | uint64_t bytes = (sector_num + nb_sectors - offset) * |
| 3123 | BDRV_SECTOR_SIZE; |
| 3124 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); |
| 3125 | } |
| 3126 | } |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3127 | |
| 3128 | out: |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 3129 | return ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3130 | } |
| 3131 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3132 | /* |
| 3133 | * Handle a read request in coroutine context |
| 3134 | */ |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3135 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
| 3136 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3137 | BdrvRequestFlags flags) |
| 3138 | { |
| 3139 | BlockDriver *drv = bs->drv; |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3140 | BdrvTrackedRequest req; |
| 3141 | |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3142 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
| 3143 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); |
| 3144 | uint8_t *head_buf = NULL; |
| 3145 | uint8_t *tail_buf = NULL; |
| 3146 | QEMUIOVector local_qiov; |
| 3147 | bool use_local_qiov = false; |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3148 | int ret; |
| 3149 | |
| 3150 | if (!drv) { |
| 3151 | return -ENOMEDIUM; |
| 3152 | } |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3153 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3154 | return -EIO; |
| 3155 | } |
| 3156 | |
| 3157 | if (bs->copy_on_read) { |
| 3158 | flags |= BDRV_REQ_COPY_ON_READ; |
| 3159 | } |
| 3160 | |
| 3161 | /* throttling disk I/O */ |
| 3162 | if (bs->io_limits_enabled) { |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 3163 | bdrv_io_limits_intercept(bs, bytes, false); |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3164 | } |
| 3165 | |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3166 | /* Align read if necessary by padding qiov */ |
| 3167 | if (offset & (align - 1)) { |
| 3168 | head_buf = qemu_blockalign(bs, align); |
| 3169 | qemu_iovec_init(&local_qiov, qiov->niov + 2); |
| 3170 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); |
| 3171 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3172 | use_local_qiov = true; |
| 3173 | |
| 3174 | bytes += offset & (align - 1); |
| 3175 | offset = offset & ~(align - 1); |
| 3176 | } |
| 3177 | |
| 3178 | if ((offset + bytes) & (align - 1)) { |
| 3179 | if (!use_local_qiov) { |
| 3180 | qemu_iovec_init(&local_qiov, qiov->niov + 1); |
| 3181 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3182 | use_local_qiov = true; |
| 3183 | } |
| 3184 | tail_buf = qemu_blockalign(bs, align); |
| 3185 | qemu_iovec_add(&local_qiov, tail_buf, |
| 3186 | align - ((offset + bytes) & (align - 1))); |
| 3187 | |
| 3188 | bytes = ROUND_UP(bytes, align); |
| 3189 | } |
| 3190 | |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3191 | tracked_request_begin(&req, bs, offset, bytes, false); |
Kevin Wolf | ec746e1 | 2013-12-04 12:13:10 +0100 | [diff] [blame] | 3192 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3193 | use_local_qiov ? &local_qiov : qiov, |
| 3194 | flags); |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3195 | tracked_request_end(&req); |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3196 | |
| 3197 | if (use_local_qiov) { |
| 3198 | qemu_iovec_destroy(&local_qiov); |
| 3199 | qemu_vfree(head_buf); |
| 3200 | qemu_vfree(tail_buf); |
| 3201 | } |
| 3202 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3203 | return ret; |
| 3204 | } |
| 3205 | |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3206 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
| 3207 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
| 3208 | BdrvRequestFlags flags) |
| 3209 | { |
| 3210 | if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) { |
| 3211 | return -EINVAL; |
| 3212 | } |
| 3213 | |
| 3214 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, |
| 3215 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); |
| 3216 | } |
| 3217 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3218 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3219 | int nb_sectors, QEMUIOVector *qiov) |
| 3220 | { |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3221 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3222 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3223 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
| 3224 | } |
| 3225 | |
| 3226 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, |
| 3227 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
| 3228 | { |
| 3229 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); |
| 3230 | |
| 3231 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, |
| 3232 | BDRV_REQ_COPY_ON_READ); |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3233 | } |
| 3234 | |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3235 | /* if no limit is specified in the BlockLimits use a default |
| 3236 | * of 32768 512-byte sectors (16 MiB) per request. |
| 3237 | */ |
| 3238 | #define MAX_WRITE_ZEROES_DEFAULT 32768 |
| 3239 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3240 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3241 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3242 | { |
| 3243 | BlockDriver *drv = bs->drv; |
| 3244 | QEMUIOVector qiov; |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3245 | struct iovec iov = {0}; |
| 3246 | int ret = 0; |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3247 | |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3248 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
| 3249 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3250 | |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3251 | while (nb_sectors > 0 && !ret) { |
| 3252 | int num = nb_sectors; |
| 3253 | |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3254 | /* Align request. Block drivers can expect the "bulk" of the request |
| 3255 | * to be aligned. |
| 3256 | */ |
| 3257 | if (bs->bl.write_zeroes_alignment |
| 3258 | && num > bs->bl.write_zeroes_alignment) { |
| 3259 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { |
| 3260 | /* Make a small request up to the first aligned sector. */ |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3261 | num = bs->bl.write_zeroes_alignment; |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3262 | num -= sector_num % bs->bl.write_zeroes_alignment; |
| 3263 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { |
| 3264 | /* Shorten the request to the last aligned sector. num cannot |
| 3265 | * underflow because num > bs->bl.write_zeroes_alignment. |
| 3266 | */ |
| 3267 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3268 | } |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3269 | } |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3270 | |
| 3271 | /* limit request size */ |
| 3272 | if (num > max_write_zeroes) { |
| 3273 | num = max_write_zeroes; |
| 3274 | } |
| 3275 | |
| 3276 | ret = -ENOTSUP; |
| 3277 | /* First try the efficient write zeroes operation */ |
| 3278 | if (drv->bdrv_co_write_zeroes) { |
| 3279 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); |
| 3280 | } |
| 3281 | |
| 3282 | if (ret == -ENOTSUP) { |
| 3283 | /* Fall back to bounce buffer if write zeroes is unsupported */ |
| 3284 | iov.iov_len = num * BDRV_SECTOR_SIZE; |
| 3285 | if (iov.iov_base == NULL) { |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 3286 | iov.iov_base = qemu_try_blockalign(bs, num * BDRV_SECTOR_SIZE); |
| 3287 | if (iov.iov_base == NULL) { |
| 3288 | ret = -ENOMEM; |
| 3289 | goto fail; |
| 3290 | } |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3291 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3292 | } |
| 3293 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 3294 | |
| 3295 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3296 | |
| 3297 | /* Keep bounce buffer around if it is big enough for all |
| 3298 | * all future requests. |
| 3299 | */ |
| 3300 | if (num < max_write_zeroes) { |
| 3301 | qemu_vfree(iov.iov_base); |
| 3302 | iov.iov_base = NULL; |
| 3303 | } |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3304 | } |
| 3305 | |
| 3306 | sector_num += num; |
| 3307 | nb_sectors -= num; |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3308 | } |
| 3309 | |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 3310 | fail: |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3311 | qemu_vfree(iov.iov_base); |
| 3312 | return ret; |
| 3313 | } |
| 3314 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3315 | /* |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3316 | * Forwards an already correctly aligned write request to the BlockDriver. |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3317 | */ |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3318 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3319 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
| 3320 | QEMUIOVector *qiov, int flags) |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3321 | { |
| 3322 | BlockDriver *drv = bs->drv; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3323 | bool waited; |
Stefan Hajnoczi | 6b7cb24 | 2011-10-13 13:08:24 +0100 | [diff] [blame] | 3324 | int ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3325 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3326 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
| 3327 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3328 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3329 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 3330 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); |
Kevin Wolf | 8eb029c | 2014-07-01 16:09:54 +0200 | [diff] [blame] | 3331 | assert(!qiov || bytes == qiov->size); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 3332 | |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3333 | waited = wait_serialising_requests(req); |
| 3334 | assert(!waited || !req->serialising); |
Kevin Wolf | af91f9a | 2014-02-07 15:35:56 +0100 | [diff] [blame] | 3335 | assert(req->overlap_offset <= offset); |
| 3336 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); |
Kevin Wolf | 244eade | 2013-12-03 14:30:44 +0100 | [diff] [blame] | 3337 | |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3338 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 3339 | |
Peter Lieven | 465bee1 | 2014-05-18 00:58:19 +0200 | [diff] [blame] | 3340 | if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && |
| 3341 | !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && |
| 3342 | qemu_iovec_is_zero(qiov)) { |
| 3343 | flags |= BDRV_REQ_ZERO_WRITE; |
| 3344 | if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { |
| 3345 | flags |= BDRV_REQ_MAY_UNMAP; |
| 3346 | } |
| 3347 | } |
| 3348 | |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 3349 | if (ret < 0) { |
| 3350 | /* Do nothing, write notifier decided to fail this request */ |
| 3351 | } else if (flags & BDRV_REQ_ZERO_WRITE) { |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3352 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3353 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3354 | } else { |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3355 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3356 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
| 3357 | } |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3358 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
Stefan Hajnoczi | 6b7cb24 | 2011-10-13 13:08:24 +0100 | [diff] [blame] | 3359 | |
Paolo Bonzini | f05fa4a | 2012-06-06 00:04:49 +0200 | [diff] [blame] | 3360 | if (ret == 0 && !bs->enable_write_cache) { |
| 3361 | ret = bdrv_co_flush(bs); |
| 3362 | } |
| 3363 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3364 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3365 | |
Benoît Canet | 5366d0c | 2014-09-05 15:46:18 +0200 | [diff] [blame] | 3366 | block_acct_highest_sector(&bs->stats, sector_num, nb_sectors); |
Benoît Canet | 5e5a94b | 2014-09-05 15:46:16 +0200 | [diff] [blame] | 3367 | |
Paolo Bonzini | df2a6f2 | 2013-09-04 19:00:21 +0200 | [diff] [blame] | 3368 | if (bs->growable && ret >= 0) { |
| 3369 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); |
| 3370 | } |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3371 | |
Stefan Hajnoczi | 6b7cb24 | 2011-10-13 13:08:24 +0100 | [diff] [blame] | 3372 | return ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3373 | } |
| 3374 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3375 | /* |
| 3376 | * Handle a write request in coroutine context |
| 3377 | */ |
Kevin Wolf | 6601553 | 2013-12-03 14:40:18 +0100 | [diff] [blame] | 3378 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
| 3379 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3380 | BdrvRequestFlags flags) |
| 3381 | { |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3382 | BdrvTrackedRequest req; |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3383 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
| 3384 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); |
| 3385 | uint8_t *head_buf = NULL; |
| 3386 | uint8_t *tail_buf = NULL; |
| 3387 | QEMUIOVector local_qiov; |
| 3388 | bool use_local_qiov = false; |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3389 | int ret; |
| 3390 | |
| 3391 | if (!bs->drv) { |
| 3392 | return -ENOMEDIUM; |
| 3393 | } |
| 3394 | if (bs->read_only) { |
| 3395 | return -EACCES; |
| 3396 | } |
Kevin Wolf | 6601553 | 2013-12-03 14:40:18 +0100 | [diff] [blame] | 3397 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3398 | return -EIO; |
| 3399 | } |
| 3400 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3401 | /* throttling disk I/O */ |
| 3402 | if (bs->io_limits_enabled) { |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 3403 | bdrv_io_limits_intercept(bs, bytes, true); |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3404 | } |
| 3405 | |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3406 | /* |
| 3407 | * Align write if necessary by performing a read-modify-write cycle. |
| 3408 | * Pad qiov with the read parts and be sure to have a tracked request not |
| 3409 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. |
| 3410 | */ |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3411 | tracked_request_begin(&req, bs, offset, bytes, true); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3412 | |
| 3413 | if (offset & (align - 1)) { |
| 3414 | QEMUIOVector head_qiov; |
| 3415 | struct iovec head_iov; |
| 3416 | |
| 3417 | mark_request_serialising(&req, align); |
| 3418 | wait_serialising_requests(&req); |
| 3419 | |
| 3420 | head_buf = qemu_blockalign(bs, align); |
| 3421 | head_iov = (struct iovec) { |
| 3422 | .iov_base = head_buf, |
| 3423 | .iov_len = align, |
| 3424 | }; |
| 3425 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); |
| 3426 | |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3427 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3428 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
| 3429 | align, &head_qiov, 0); |
| 3430 | if (ret < 0) { |
| 3431 | goto fail; |
| 3432 | } |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3433 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3434 | |
| 3435 | qemu_iovec_init(&local_qiov, qiov->niov + 2); |
| 3436 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); |
| 3437 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3438 | use_local_qiov = true; |
| 3439 | |
| 3440 | bytes += offset & (align - 1); |
| 3441 | offset = offset & ~(align - 1); |
| 3442 | } |
| 3443 | |
| 3444 | if ((offset + bytes) & (align - 1)) { |
| 3445 | QEMUIOVector tail_qiov; |
| 3446 | struct iovec tail_iov; |
| 3447 | size_t tail_bytes; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3448 | bool waited; |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3449 | |
| 3450 | mark_request_serialising(&req, align); |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3451 | waited = wait_serialising_requests(&req); |
| 3452 | assert(!waited || !use_local_qiov); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3453 | |
| 3454 | tail_buf = qemu_blockalign(bs, align); |
| 3455 | tail_iov = (struct iovec) { |
| 3456 | .iov_base = tail_buf, |
| 3457 | .iov_len = align, |
| 3458 | }; |
| 3459 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); |
| 3460 | |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3461 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3462 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
| 3463 | align, &tail_qiov, 0); |
| 3464 | if (ret < 0) { |
| 3465 | goto fail; |
| 3466 | } |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3467 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3468 | |
| 3469 | if (!use_local_qiov) { |
| 3470 | qemu_iovec_init(&local_qiov, qiov->niov + 1); |
| 3471 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3472 | use_local_qiov = true; |
| 3473 | } |
| 3474 | |
| 3475 | tail_bytes = (offset + bytes) & (align - 1); |
| 3476 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); |
| 3477 | |
| 3478 | bytes = ROUND_UP(bytes, align); |
| 3479 | } |
| 3480 | |
| 3481 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, |
| 3482 | use_local_qiov ? &local_qiov : qiov, |
| 3483 | flags); |
| 3484 | |
| 3485 | fail: |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3486 | tracked_request_end(&req); |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3487 | |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3488 | if (use_local_qiov) { |
| 3489 | qemu_iovec_destroy(&local_qiov); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3490 | } |
Kevin Wolf | 99c4a85 | 2014-02-07 15:29:00 +0100 | [diff] [blame] | 3491 | qemu_vfree(head_buf); |
| 3492 | qemu_vfree(tail_buf); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3493 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3494 | return ret; |
| 3495 | } |
| 3496 | |
Kevin Wolf | 6601553 | 2013-12-03 14:40:18 +0100 | [diff] [blame] | 3497 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
| 3498 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
| 3499 | BdrvRequestFlags flags) |
| 3500 | { |
| 3501 | if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) { |
| 3502 | return -EINVAL; |
| 3503 | } |
| 3504 | |
| 3505 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, |
| 3506 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); |
| 3507 | } |
| 3508 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3509 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
| 3510 | int nb_sectors, QEMUIOVector *qiov) |
| 3511 | { |
| 3512 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); |
| 3513 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3514 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
| 3515 | } |
| 3516 | |
| 3517 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3518 | int64_t sector_num, int nb_sectors, |
| 3519 | BdrvRequestFlags flags) |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3520 | { |
Paolo Bonzini | 94d6ff2 | 2013-11-22 13:39:45 +0100 | [diff] [blame] | 3521 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3522 | |
Peter Lieven | d32f35c | 2013-10-24 12:06:52 +0200 | [diff] [blame] | 3523 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
| 3524 | flags &= ~BDRV_REQ_MAY_UNMAP; |
| 3525 | } |
| 3526 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3527 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3528 | BDRV_REQ_ZERO_WRITE | flags); |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3529 | } |
| 3530 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3531 | /** |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3532 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 3533 | */ |
| 3534 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
| 3535 | { |
| 3536 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3537 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3538 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3539 | return -ENOMEDIUM; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3540 | if (!drv->bdrv_truncate) |
| 3541 | return -ENOTSUP; |
Naphtali Sprei | 59f2689 | 2009-10-26 16:25:16 +0200 | [diff] [blame] | 3542 | if (bs->read_only) |
| 3543 | return -EACCES; |
Jeff Cody | 9c75e16 | 2014-06-25 16:55:30 -0400 | [diff] [blame] | 3544 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3545 | ret = drv->bdrv_truncate(bs, offset); |
| 3546 | if (ret == 0) { |
| 3547 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 3548 | bdrv_dev_resize_cb(bs); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3549 | } |
| 3550 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3551 | } |
| 3552 | |
| 3553 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 3554 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 3555 | * allocated space. Return < 0 if error or unknown. |
| 3556 | */ |
| 3557 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 3558 | { |
| 3559 | BlockDriver *drv = bs->drv; |
| 3560 | if (!drv) { |
| 3561 | return -ENOMEDIUM; |
| 3562 | } |
| 3563 | if (drv->bdrv_get_allocated_file_size) { |
| 3564 | return drv->bdrv_get_allocated_file_size(bs); |
| 3565 | } |
| 3566 | if (bs->file) { |
| 3567 | return bdrv_get_allocated_file_size(bs->file); |
| 3568 | } |
| 3569 | return -ENOTSUP; |
| 3570 | } |
| 3571 | |
| 3572 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3573 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3574 | */ |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3575 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3576 | { |
| 3577 | BlockDriver *drv = bs->drv; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3578 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3579 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3580 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3581 | |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 3582 | if (drv->has_variable_length) { |
| 3583 | int ret = refresh_total_sectors(bs, bs->total_sectors); |
| 3584 | if (ret < 0) { |
| 3585 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 3586 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3587 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3588 | return bs->total_sectors; |
| 3589 | } |
| 3590 | |
| 3591 | /** |
| 3592 | * Return length in bytes on success, -errno on error. |
| 3593 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 3594 | */ |
| 3595 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 3596 | { |
| 3597 | int64_t ret = bdrv_nb_sectors(bs); |
| 3598 | |
| 3599 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3600 | } |
| 3601 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3602 | /* return 0 as number of sectors if no device present or error */ |
ths | 96b8f13 | 2007-12-17 01:35:20 +0000 | [diff] [blame] | 3603 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3604 | { |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3605 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
| 3606 | |
| 3607 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3608 | } |
bellard | cf98951 | 2004-02-16 21:56:36 +0000 | [diff] [blame] | 3609 | |
Paolo Bonzini | ff06f5f | 2012-09-28 17:22:54 +0200 | [diff] [blame] | 3610 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
| 3611 | BlockdevOnError on_write_error) |
Markus Armbruster | abd7f68 | 2010-06-02 18:55:17 +0200 | [diff] [blame] | 3612 | { |
| 3613 | bs->on_read_error = on_read_error; |
| 3614 | bs->on_write_error = on_write_error; |
| 3615 | } |
| 3616 | |
Paolo Bonzini | 1ceee0d | 2012-09-28 17:22:56 +0200 | [diff] [blame] | 3617 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
Markus Armbruster | abd7f68 | 2010-06-02 18:55:17 +0200 | [diff] [blame] | 3618 | { |
| 3619 | return is_read ? bs->on_read_error : bs->on_write_error; |
| 3620 | } |
| 3621 | |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3622 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
| 3623 | { |
| 3624 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; |
| 3625 | |
| 3626 | switch (on_err) { |
| 3627 | case BLOCKDEV_ON_ERROR_ENOSPC: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3628 | return (error == ENOSPC) ? |
| 3629 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3630 | case BLOCKDEV_ON_ERROR_STOP: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3631 | return BLOCK_ERROR_ACTION_STOP; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3632 | case BLOCKDEV_ON_ERROR_REPORT: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3633 | return BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3634 | case BLOCKDEV_ON_ERROR_IGNORE: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3635 | return BLOCK_ERROR_ACTION_IGNORE; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3636 | default: |
| 3637 | abort(); |
| 3638 | } |
| 3639 | } |
| 3640 | |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 3641 | static void send_qmp_error_event(BlockDriverState *bs, |
| 3642 | BlockErrorAction action, |
| 3643 | bool is_read, int error) |
| 3644 | { |
| 3645 | BlockErrorAction ac; |
| 3646 | |
| 3647 | ac = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; |
| 3648 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), ac, action, |
| 3649 | bdrv_iostatus_is_enabled(bs), |
Luiz Capitulino | 624ff57 | 2014-09-11 10:25:48 -0400 | [diff] [blame] | 3650 | error == ENOSPC, strerror(error), |
| 3651 | &error_abort); |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 3652 | } |
| 3653 | |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3654 | /* This is done by device models because, while the block layer knows |
| 3655 | * about the error, it does not know whether an operation comes from |
| 3656 | * the device or the block layer (from a job, for example). |
| 3657 | */ |
| 3658 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, |
| 3659 | bool is_read, int error) |
| 3660 | { |
| 3661 | assert(error >= 0); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3662 | |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3663 | if (action == BLOCK_ERROR_ACTION_STOP) { |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3664 | /* First set the iostatus, so that "info block" returns an iostatus |
| 3665 | * that matches the events raised so far (an additional error iostatus |
| 3666 | * is fine, but not a lost one). |
| 3667 | */ |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3668 | bdrv_iostatus_set_err(bs, error); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3669 | |
| 3670 | /* Then raise the request to stop the VM and the event. |
| 3671 | * qemu_system_vmstop_request_prepare has two effects. First, |
| 3672 | * it ensures that the STOP event always comes after the |
| 3673 | * BLOCK_IO_ERROR event. Second, it ensures that even if management |
| 3674 | * can observe the STOP event and do a "cont" before the STOP |
| 3675 | * event is issued, the VM will not stop. In this case, vm_start() |
| 3676 | * also ensures that the STOP/RESUME pair of events is emitted. |
| 3677 | */ |
| 3678 | qemu_system_vmstop_request_prepare(); |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 3679 | send_qmp_error_event(bs, action, is_read, error); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3680 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
| 3681 | } else { |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 3682 | send_qmp_error_event(bs, action, is_read, error); |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3683 | } |
| 3684 | } |
| 3685 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3686 | int bdrv_is_read_only(BlockDriverState *bs) |
| 3687 | { |
| 3688 | return bs->read_only; |
| 3689 | } |
| 3690 | |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 3691 | int bdrv_is_sg(BlockDriverState *bs) |
| 3692 | { |
| 3693 | return bs->sg; |
| 3694 | } |
| 3695 | |
Christoph Hellwig | e900a7b | 2009-09-04 19:01:15 +0200 | [diff] [blame] | 3696 | int bdrv_enable_write_cache(BlockDriverState *bs) |
| 3697 | { |
| 3698 | return bs->enable_write_cache; |
| 3699 | } |
| 3700 | |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 3701 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
| 3702 | { |
| 3703 | bs->enable_write_cache = wce; |
Jeff Cody | 55b110f | 2012-09-20 15:13:18 -0400 | [diff] [blame] | 3704 | |
| 3705 | /* so a reopen() will preserve wce */ |
| 3706 | if (wce) { |
| 3707 | bs->open_flags |= BDRV_O_CACHE_WB; |
| 3708 | } else { |
| 3709 | bs->open_flags &= ~BDRV_O_CACHE_WB; |
| 3710 | } |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 3711 | } |
| 3712 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3713 | int bdrv_is_encrypted(BlockDriverState *bs) |
| 3714 | { |
| 3715 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 3716 | return 1; |
| 3717 | return bs->encrypted; |
| 3718 | } |
| 3719 | |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 3720 | int bdrv_key_required(BlockDriverState *bs) |
| 3721 | { |
| 3722 | BlockDriverState *backing_hd = bs->backing_hd; |
| 3723 | |
| 3724 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
| 3725 | return 1; |
| 3726 | return (bs->encrypted && !bs->valid_key); |
| 3727 | } |
| 3728 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3729 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 3730 | { |
| 3731 | int ret; |
| 3732 | if (bs->backing_hd && bs->backing_hd->encrypted) { |
| 3733 | ret = bdrv_set_key(bs->backing_hd, key); |
| 3734 | if (ret < 0) |
| 3735 | return ret; |
| 3736 | if (!bs->encrypted) |
| 3737 | return 0; |
| 3738 | } |
Shahar Havivi | fd04a2a | 2010-03-06 00:26:13 +0200 | [diff] [blame] | 3739 | if (!bs->encrypted) { |
| 3740 | return -EINVAL; |
| 3741 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 3742 | return -ENOMEDIUM; |
| 3743 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 3744 | ret = bs->drv->bdrv_set_key(bs, key); |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 3745 | if (ret < 0) { |
| 3746 | bs->valid_key = 0; |
| 3747 | } else if (!bs->valid_key) { |
| 3748 | bs->valid_key = 1; |
| 3749 | /* call the change callback now, we skipped it on open */ |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 3750 | bdrv_dev_change_media_cb(bs, true); |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 3751 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 3752 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3753 | } |
| 3754 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 3755 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3756 | { |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 3757 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3758 | } |
| 3759 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3760 | static int qsort_strcmp(const void *a, const void *b) |
| 3761 | { |
| 3762 | return strcmp(a, b); |
| 3763 | } |
| 3764 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3765 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3766 | void *opaque) |
| 3767 | { |
| 3768 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3769 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3770 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3771 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3772 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 3773 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3774 | if (drv->format_name) { |
| 3775 | bool found = false; |
| 3776 | int i = count; |
| 3777 | while (formats && i && !found) { |
| 3778 | found = !strcmp(formats[--i], drv->format_name); |
| 3779 | } |
| 3780 | |
| 3781 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3782 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3783 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3784 | } |
| 3785 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3786 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3787 | |
| 3788 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 3789 | |
| 3790 | for (i = 0; i < count; i++) { |
| 3791 | it(opaque, formats[i]); |
| 3792 | } |
| 3793 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3794 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3795 | } |
| 3796 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3797 | /* This function is to find block backend bs */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3798 | /* TODO convert callers to blk_by_name(), then remove */ |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3799 | BlockDriverState *bdrv_find(const char *name) |
| 3800 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3801 | BlockBackend *blk = blk_by_name(name); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3802 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3803 | return blk ? blk_bs(blk) : NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3804 | } |
| 3805 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3806 | /* This function is to find a node in the bs graph */ |
| 3807 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 3808 | { |
| 3809 | BlockDriverState *bs; |
| 3810 | |
| 3811 | assert(node_name); |
| 3812 | |
| 3813 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 3814 | if (!strcmp(node_name, bs->node_name)) { |
| 3815 | return bs; |
| 3816 | } |
| 3817 | } |
| 3818 | return NULL; |
| 3819 | } |
| 3820 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 3821 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
| 3822 | BlockDeviceInfoList *bdrv_named_nodes_list(void) |
| 3823 | { |
| 3824 | BlockDeviceInfoList *list, *entry; |
| 3825 | BlockDriverState *bs; |
| 3826 | |
| 3827 | list = NULL; |
| 3828 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 3829 | entry = g_malloc0(sizeof(*entry)); |
| 3830 | entry->value = bdrv_block_device_info(bs); |
| 3831 | entry->next = list; |
| 3832 | list = entry; |
| 3833 | } |
| 3834 | |
| 3835 | return list; |
| 3836 | } |
| 3837 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3838 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 3839 | const char *node_name, |
| 3840 | Error **errp) |
| 3841 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3842 | BlockBackend *blk; |
| 3843 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3844 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3845 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3846 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3847 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3848 | if (blk) { |
| 3849 | return blk_bs(blk); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3850 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3851 | } |
| 3852 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3853 | if (node_name) { |
| 3854 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3855 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3856 | if (bs) { |
| 3857 | return bs; |
| 3858 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3859 | } |
| 3860 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3861 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
| 3862 | device ? device : "", |
| 3863 | node_name ? node_name : ""); |
| 3864 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3865 | } |
| 3866 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 3867 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 3868 | * return false. If either argument is NULL, return false. */ |
| 3869 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 3870 | { |
| 3871 | while (top && top != base) { |
| 3872 | top = top->backing_hd; |
| 3873 | } |
| 3874 | |
| 3875 | return top != NULL; |
| 3876 | } |
| 3877 | |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 3878 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 3879 | { |
| 3880 | if (!bs) { |
| 3881 | return QTAILQ_FIRST(&bdrv_states); |
| 3882 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3883 | return QTAILQ_NEXT(bs, device_list); |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 3884 | } |
| 3885 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3886 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3887 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3888 | { |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3889 | return bs->blk ? blk_name(bs->blk) : ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3890 | } |
| 3891 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 3892 | int bdrv_get_flags(BlockDriverState *bs) |
| 3893 | { |
| 3894 | return bs->open_flags; |
| 3895 | } |
| 3896 | |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3897 | int bdrv_flush_all(void) |
aliguori | c6ca28d | 2008-10-06 13:55:43 +0000 | [diff] [blame] | 3898 | { |
| 3899 | BlockDriverState *bs; |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3900 | int result = 0; |
aliguori | c6ca28d | 2008-10-06 13:55:43 +0000 | [diff] [blame] | 3901 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3902 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3903 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 3904 | int ret; |
| 3905 | |
| 3906 | aio_context_acquire(aio_context); |
| 3907 | ret = bdrv_flush(bs); |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3908 | if (ret < 0 && !result) { |
| 3909 | result = ret; |
| 3910 | } |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3911 | aio_context_release(aio_context); |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 3912 | } |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3913 | |
| 3914 | return result; |
aliguori | c6ca28d | 2008-10-06 13:55:43 +0000 | [diff] [blame] | 3915 | } |
| 3916 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 3917 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 3918 | { |
| 3919 | return 1; |
| 3920 | } |
| 3921 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3922 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 3923 | { |
| 3924 | assert(bs->drv); |
| 3925 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 3926 | /* If BS is a copy on write image, it is initialized to |
| 3927 | the contents of the base image, which may not be zeroes. */ |
| 3928 | if (bs->backing_hd) { |
| 3929 | return 0; |
| 3930 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 3931 | if (bs->drv->bdrv_has_zero_init) { |
| 3932 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3933 | } |
| 3934 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 3935 | /* safe default */ |
| 3936 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3937 | } |
| 3938 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 3939 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
| 3940 | { |
| 3941 | BlockDriverInfo bdi; |
| 3942 | |
| 3943 | if (bs->backing_hd) { |
| 3944 | return false; |
| 3945 | } |
| 3946 | |
| 3947 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 3948 | return bdi.unallocated_blocks_are_zero; |
| 3949 | } |
| 3950 | |
| 3951 | return false; |
| 3952 | } |
| 3953 | |
| 3954 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 3955 | { |
| 3956 | BlockDriverInfo bdi; |
| 3957 | |
| 3958 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { |
| 3959 | return false; |
| 3960 | } |
| 3961 | |
| 3962 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 3963 | return bdi.can_write_zeroes_with_unmap; |
| 3964 | } |
| 3965 | |
| 3966 | return false; |
| 3967 | } |
| 3968 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3969 | typedef struct BdrvCoGetBlockStatusData { |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3970 | BlockDriverState *bs; |
Miroslav Rezanina | b35b2bb | 2013-02-13 09:09:39 +0100 | [diff] [blame] | 3971 | BlockDriverState *base; |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3972 | int64_t sector_num; |
| 3973 | int nb_sectors; |
| 3974 | int *pnum; |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3975 | int64_t ret; |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3976 | bool done; |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3977 | } BdrvCoGetBlockStatusData; |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3978 | |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3979 | /* |
| 3980 | * Returns true iff the specified sector is present in the disk image. Drivers |
| 3981 | * not implementing the functionality are assumed to not support backing files, |
| 3982 | * hence all their sectors are reported as allocated. |
| 3983 | * |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3984 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
| 3985 | * and 'pnum' is set to 0. |
| 3986 | * |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3987 | * 'pnum' is set to the number of sectors (including and immediately following |
| 3988 | * the specified sector) that are known to be in the same |
| 3989 | * allocated/unallocated state. |
| 3990 | * |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3991 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
| 3992 | * beyond the end of the disk image it will be clamped. |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3993 | */ |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3994 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
| 3995 | int64_t sector_num, |
| 3996 | int nb_sectors, int *pnum) |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3997 | { |
Markus Armbruster | 30a7f2f | 2014-06-26 13:23:20 +0200 | [diff] [blame] | 3998 | int64_t total_sectors; |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3999 | int64_t n; |
Paolo Bonzini | 5daa74a | 2013-09-04 19:00:38 +0200 | [diff] [blame] | 4000 | int64_t ret, ret2; |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 4001 | |
Markus Armbruster | 30a7f2f | 2014-06-26 13:23:20 +0200 | [diff] [blame] | 4002 | total_sectors = bdrv_nb_sectors(bs); |
| 4003 | if (total_sectors < 0) { |
| 4004 | return total_sectors; |
Paolo Bonzini | 617ccb4 | 2013-09-04 19:00:23 +0200 | [diff] [blame] | 4005 | } |
| 4006 | |
Markus Armbruster | 30a7f2f | 2014-06-26 13:23:20 +0200 | [diff] [blame] | 4007 | if (sector_num >= total_sectors) { |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 4008 | *pnum = 0; |
| 4009 | return 0; |
| 4010 | } |
| 4011 | |
Markus Armbruster | 30a7f2f | 2014-06-26 13:23:20 +0200 | [diff] [blame] | 4012 | n = total_sectors - sector_num; |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 4013 | if (n < nb_sectors) { |
| 4014 | nb_sectors = n; |
| 4015 | } |
| 4016 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4017 | if (!bs->drv->bdrv_co_get_block_status) { |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 4018 | *pnum = nb_sectors; |
Kevin Wolf | e88ae22 | 2014-05-06 15:25:36 +0200 | [diff] [blame] | 4019 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
Paolo Bonzini | 918e92d | 2013-09-04 19:00:37 +0200 | [diff] [blame] | 4020 | if (bs->drv->protocol_name) { |
| 4021 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); |
| 4022 | } |
| 4023 | return ret; |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 4024 | } |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4025 | |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 4026 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
| 4027 | if (ret < 0) { |
Peter Lieven | 3e0a233 | 2013-09-24 15:35:08 +0200 | [diff] [blame] | 4028 | *pnum = 0; |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 4029 | return ret; |
| 4030 | } |
| 4031 | |
Peter Lieven | 92bc50a | 2013-10-08 14:43:14 +0200 | [diff] [blame] | 4032 | if (ret & BDRV_BLOCK_RAW) { |
| 4033 | assert(ret & BDRV_BLOCK_OFFSET_VALID); |
| 4034 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, |
| 4035 | *pnum, pnum); |
| 4036 | } |
| 4037 | |
Kevin Wolf | e88ae22 | 2014-05-06 15:25:36 +0200 | [diff] [blame] | 4038 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
| 4039 | ret |= BDRV_BLOCK_ALLOCATED; |
| 4040 | } |
| 4041 | |
Peter Lieven | c3d8688 | 2013-10-24 12:07:04 +0200 | [diff] [blame] | 4042 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
| 4043 | if (bdrv_unallocated_blocks_are_zero(bs)) { |
Paolo Bonzini | f0ad571 | 2013-09-04 19:00:32 +0200 | [diff] [blame] | 4044 | ret |= BDRV_BLOCK_ZERO; |
Peter Lieven | 1f9db22 | 2013-09-24 15:35:09 +0200 | [diff] [blame] | 4045 | } else if (bs->backing_hd) { |
Paolo Bonzini | f0ad571 | 2013-09-04 19:00:32 +0200 | [diff] [blame] | 4046 | BlockDriverState *bs2 = bs->backing_hd; |
Markus Armbruster | 30a7f2f | 2014-06-26 13:23:20 +0200 | [diff] [blame] | 4047 | int64_t nb_sectors2 = bdrv_nb_sectors(bs2); |
| 4048 | if (nb_sectors2 >= 0 && sector_num >= nb_sectors2) { |
Paolo Bonzini | f0ad571 | 2013-09-04 19:00:32 +0200 | [diff] [blame] | 4049 | ret |= BDRV_BLOCK_ZERO; |
| 4050 | } |
| 4051 | } |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 4052 | } |
Paolo Bonzini | 5daa74a | 2013-09-04 19:00:38 +0200 | [diff] [blame] | 4053 | |
| 4054 | if (bs->file && |
| 4055 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && |
| 4056 | (ret & BDRV_BLOCK_OFFSET_VALID)) { |
| 4057 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, |
| 4058 | *pnum, pnum); |
| 4059 | if (ret2 >= 0) { |
| 4060 | /* Ignore errors. This is just providing extra information, it |
| 4061 | * is useful but not necessary. |
| 4062 | */ |
| 4063 | ret |= (ret2 & BDRV_BLOCK_ZERO); |
| 4064 | } |
| 4065 | } |
| 4066 | |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 4067 | return ret; |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4068 | } |
| 4069 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4070 | /* Coroutine wrapper for bdrv_get_block_status() */ |
| 4071 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4072 | { |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4073 | BdrvCoGetBlockStatusData *data = opaque; |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4074 | BlockDriverState *bs = data->bs; |
| 4075 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4076 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
| 4077 | data->pnum); |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4078 | data->done = true; |
| 4079 | } |
| 4080 | |
| 4081 | /* |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4082 | * Synchronous wrapper around bdrv_co_get_block_status(). |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4083 | * |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4084 | * See bdrv_co_get_block_status() for details. |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4085 | */ |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4086 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
| 4087 | int nb_sectors, int *pnum) |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4088 | { |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4089 | Coroutine *co; |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4090 | BdrvCoGetBlockStatusData data = { |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4091 | .bs = bs, |
| 4092 | .sector_num = sector_num, |
| 4093 | .nb_sectors = nb_sectors, |
| 4094 | .pnum = pnum, |
| 4095 | .done = false, |
| 4096 | }; |
| 4097 | |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4098 | if (qemu_in_coroutine()) { |
| 4099 | /* Fast-path if already in coroutine context */ |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4100 | bdrv_get_block_status_co_entry(&data); |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4101 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4102 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 4103 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4104 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4105 | qemu_coroutine_enter(co, &data); |
| 4106 | while (!data.done) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4107 | aio_poll(aio_context, true); |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4108 | } |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4109 | } |
| 4110 | return data.ret; |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 4111 | } |
| 4112 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4113 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
| 4114 | int nb_sectors, int *pnum) |
| 4115 | { |
Paolo Bonzini | 4333bb7 | 2013-09-04 19:00:29 +0200 | [diff] [blame] | 4116 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
| 4117 | if (ret < 0) { |
| 4118 | return ret; |
| 4119 | } |
Kevin Wolf | 01fb270 | 2014-07-07 17:00:37 +0200 | [diff] [blame] | 4120 | return !!(ret & BDRV_BLOCK_ALLOCATED); |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4121 | } |
| 4122 | |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4123 | /* |
| 4124 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] |
| 4125 | * |
| 4126 | * Return true if the given sector is allocated in any image between |
| 4127 | * BASE and TOP (inclusive). BASE can be NULL to check if the given |
| 4128 | * sector is allocated in any image of the chain. Return false otherwise. |
| 4129 | * |
| 4130 | * 'pnum' is set to the number of sectors (including and immediately following |
| 4131 | * the specified sector) that are known to be in the same |
| 4132 | * allocated/unallocated state. |
| 4133 | * |
| 4134 | */ |
Paolo Bonzini | 4f57863 | 2013-09-04 19:00:24 +0200 | [diff] [blame] | 4135 | int bdrv_is_allocated_above(BlockDriverState *top, |
| 4136 | BlockDriverState *base, |
| 4137 | int64_t sector_num, |
| 4138 | int nb_sectors, int *pnum) |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4139 | { |
| 4140 | BlockDriverState *intermediate; |
| 4141 | int ret, n = nb_sectors; |
| 4142 | |
| 4143 | intermediate = top; |
| 4144 | while (intermediate && intermediate != base) { |
| 4145 | int pnum_inter; |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4146 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
| 4147 | &pnum_inter); |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4148 | if (ret < 0) { |
| 4149 | return ret; |
| 4150 | } else if (ret) { |
| 4151 | *pnum = pnum_inter; |
| 4152 | return 1; |
| 4153 | } |
| 4154 | |
| 4155 | /* |
| 4156 | * [sector_num, nb_sectors] is unallocated on top but intermediate |
| 4157 | * might have |
| 4158 | * |
| 4159 | * [sector_num+x, nr_sectors] allocated. |
| 4160 | */ |
Vishvananda Ishaya | 63ba17d | 2013-01-24 10:02:08 -0800 | [diff] [blame] | 4161 | if (n > pnum_inter && |
| 4162 | (intermediate == top || |
| 4163 | sector_num + pnum_inter < intermediate->total_sectors)) { |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4164 | n = pnum_inter; |
| 4165 | } |
| 4166 | |
| 4167 | intermediate = intermediate->backing_hd; |
| 4168 | } |
| 4169 | |
| 4170 | *pnum = n; |
| 4171 | return 0; |
| 4172 | } |
| 4173 | |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 4174 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 4175 | { |
| 4176 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 4177 | return bs->backing_file; |
| 4178 | else if (bs->encrypted) |
| 4179 | return bs->filename; |
| 4180 | else |
| 4181 | return NULL; |
| 4182 | } |
| 4183 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4184 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4185 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4186 | { |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 4187 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4188 | } |
| 4189 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4190 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4191 | const uint8_t *buf, int nb_sectors) |
| 4192 | { |
| 4193 | BlockDriver *drv = bs->drv; |
| 4194 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4195 | return -ENOMEDIUM; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4196 | if (!drv->bdrv_write_compressed) |
| 4197 | return -ENOTSUP; |
Kevin Wolf | fbb7b4e | 2009-05-08 14:47:24 +0200 | [diff] [blame] | 4198 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 4199 | return -EIO; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 4200 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 4201 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 4202 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4203 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
| 4204 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 4205 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4206 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 4207 | { |
| 4208 | BlockDriver *drv = bs->drv; |
| 4209 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4210 | return -ENOMEDIUM; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4211 | if (!drv->bdrv_get_info) |
| 4212 | return -ENOTSUP; |
| 4213 | memset(bdi, 0, sizeof(*bdi)); |
| 4214 | return drv->bdrv_get_info(bs, bdi); |
| 4215 | } |
| 4216 | |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 4217 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
| 4218 | { |
| 4219 | BlockDriver *drv = bs->drv; |
| 4220 | if (drv && drv->bdrv_get_specific_info) { |
| 4221 | return drv->bdrv_get_specific_info(bs); |
| 4222 | } |
| 4223 | return NULL; |
| 4224 | } |
| 4225 | |
Christoph Hellwig | 45566e9 | 2009-07-10 23:11:57 +0200 | [diff] [blame] | 4226 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| 4227 | int64_t pos, int size) |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4228 | { |
Kevin Wolf | cf8074b | 2013-04-05 21:27:53 +0200 | [diff] [blame] | 4229 | QEMUIOVector qiov; |
| 4230 | struct iovec iov = { |
| 4231 | .iov_base = (void *) buf, |
| 4232 | .iov_len = size, |
| 4233 | }; |
| 4234 | |
| 4235 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 4236 | return bdrv_writev_vmstate(bs, &qiov, pos); |
| 4237 | } |
| 4238 | |
| 4239 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) |
| 4240 | { |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4241 | BlockDriver *drv = bs->drv; |
Kevin Wolf | cf8074b | 2013-04-05 21:27:53 +0200 | [diff] [blame] | 4242 | |
| 4243 | if (!drv) { |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4244 | return -ENOMEDIUM; |
Kevin Wolf | cf8074b | 2013-04-05 21:27:53 +0200 | [diff] [blame] | 4245 | } else if (drv->bdrv_save_vmstate) { |
| 4246 | return drv->bdrv_save_vmstate(bs, qiov, pos); |
| 4247 | } else if (bs->file) { |
| 4248 | return bdrv_writev_vmstate(bs->file, qiov, pos); |
| 4249 | } |
| 4250 | |
MORITA Kazutaka | 7cdb1f6 | 2010-05-28 11:44:58 +0900 | [diff] [blame] | 4251 | return -ENOTSUP; |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4252 | } |
| 4253 | |
Christoph Hellwig | 45566e9 | 2009-07-10 23:11:57 +0200 | [diff] [blame] | 4254 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
| 4255 | int64_t pos, int size) |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4256 | { |
| 4257 | BlockDriver *drv = bs->drv; |
| 4258 | if (!drv) |
| 4259 | return -ENOMEDIUM; |
MORITA Kazutaka | 7cdb1f6 | 2010-05-28 11:44:58 +0900 | [diff] [blame] | 4260 | if (drv->bdrv_load_vmstate) |
| 4261 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
| 4262 | if (bs->file) |
| 4263 | return bdrv_load_vmstate(bs->file, buf, pos, size); |
| 4264 | return -ENOTSUP; |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4265 | } |
| 4266 | |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4267 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
| 4268 | { |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4269 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4270 | return; |
| 4271 | } |
| 4272 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4273 | bs->drv->bdrv_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4274 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4275 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4276 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 4277 | const char *tag) |
| 4278 | { |
| 4279 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
| 4280 | bs = bs->file; |
| 4281 | } |
| 4282 | |
| 4283 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
| 4284 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 4285 | } |
| 4286 | |
| 4287 | return -ENOTSUP; |
| 4288 | } |
| 4289 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 4290 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 4291 | { |
| 4292 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
| 4293 | bs = bs->file; |
| 4294 | } |
| 4295 | |
| 4296 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
| 4297 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 4298 | } |
| 4299 | |
| 4300 | return -ENOTSUP; |
| 4301 | } |
| 4302 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4303 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 4304 | { |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 4305 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4306 | bs = bs->file; |
| 4307 | } |
| 4308 | |
| 4309 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 4310 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 4311 | } |
| 4312 | |
| 4313 | return -ENOTSUP; |
| 4314 | } |
| 4315 | |
| 4316 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 4317 | { |
| 4318 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
| 4319 | bs = bs->file; |
| 4320 | } |
| 4321 | |
| 4322 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 4323 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 4324 | } |
| 4325 | |
| 4326 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4327 | } |
| 4328 | |
Blue Swirl | 199630b | 2010-07-25 20:49:34 +0000 | [diff] [blame] | 4329 | int bdrv_is_snapshot(BlockDriverState *bs) |
| 4330 | { |
| 4331 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); |
| 4332 | } |
| 4333 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4334 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 4335 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 4336 | * from a BDS as backing_file should not be done, as that may be relative to |
| 4337 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4338 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 4339 | const char *backing_file) |
| 4340 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4341 | char *filename_full = NULL; |
| 4342 | char *backing_file_full = NULL; |
| 4343 | char *filename_tmp = NULL; |
| 4344 | int is_protocol = 0; |
| 4345 | BlockDriverState *curr_bs = NULL; |
| 4346 | BlockDriverState *retval = NULL; |
| 4347 | |
| 4348 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4349 | return NULL; |
| 4350 | } |
| 4351 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4352 | filename_full = g_malloc(PATH_MAX); |
| 4353 | backing_file_full = g_malloc(PATH_MAX); |
| 4354 | filename_tmp = g_malloc(PATH_MAX); |
| 4355 | |
| 4356 | is_protocol = path_has_protocol(backing_file); |
| 4357 | |
| 4358 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { |
| 4359 | |
| 4360 | /* If either of the filename paths is actually a protocol, then |
| 4361 | * compare unmodified paths; otherwise make paths relative */ |
| 4362 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 4363 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
| 4364 | retval = curr_bs->backing_hd; |
| 4365 | break; |
| 4366 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4367 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4368 | /* If not an absolute filename path, make it relative to the current |
| 4369 | * image's filename path */ |
| 4370 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 4371 | backing_file); |
| 4372 | |
| 4373 | /* We are going to compare absolute pathnames */ |
| 4374 | if (!realpath(filename_tmp, filename_full)) { |
| 4375 | continue; |
| 4376 | } |
| 4377 | |
| 4378 | /* We need to make sure the backing filename we are comparing against |
| 4379 | * is relative to the current image filename (or absolute) */ |
| 4380 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 4381 | curr_bs->backing_file); |
| 4382 | |
| 4383 | if (!realpath(filename_tmp, backing_file_full)) { |
| 4384 | continue; |
| 4385 | } |
| 4386 | |
| 4387 | if (strcmp(backing_file_full, filename_full) == 0) { |
| 4388 | retval = curr_bs->backing_hd; |
| 4389 | break; |
| 4390 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4391 | } |
| 4392 | } |
| 4393 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4394 | g_free(filename_full); |
| 4395 | g_free(backing_file_full); |
| 4396 | g_free(filename_tmp); |
| 4397 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4398 | } |
| 4399 | |
Benoît Canet | f198fd1 | 2012-08-02 10:22:47 +0200 | [diff] [blame] | 4400 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
| 4401 | { |
| 4402 | if (!bs->drv) { |
| 4403 | return 0; |
| 4404 | } |
| 4405 | |
| 4406 | if (!bs->backing_hd) { |
| 4407 | return 0; |
| 4408 | } |
| 4409 | |
| 4410 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); |
| 4411 | } |
| 4412 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4413 | /**************************************************************/ |
| 4414 | /* async I/Os */ |
| 4415 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4416 | BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 4417 | QEMUIOVector *qiov, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4418 | BlockCompletionFunc *cb, void *opaque) |
aliguori | 3b69e4b | 2009-01-22 16:59:24 +0000 | [diff] [blame] | 4419 | { |
Stefan Hajnoczi | bbf0a44 | 2010-10-05 14:28:53 +0100 | [diff] [blame] | 4420 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
| 4421 | |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4422 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4423 | cb, opaque, false); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4424 | } |
| 4425 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4426 | BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 4427 | QEMUIOVector *qiov, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4428 | BlockCompletionFunc *cb, void *opaque) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4429 | { |
Stefan Hajnoczi | bbf0a44 | 2010-10-05 14:28:53 +0100 | [diff] [blame] | 4430 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
| 4431 | |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4432 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4433 | cb, opaque, true); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4434 | } |
| 4435 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4436 | BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
Paolo Bonzini | d5ef94d | 2013-11-22 13:39:46 +0100 | [diff] [blame] | 4437 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4438 | BlockCompletionFunc *cb, void *opaque) |
Paolo Bonzini | d5ef94d | 2013-11-22 13:39:46 +0100 | [diff] [blame] | 4439 | { |
| 4440 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); |
| 4441 | |
| 4442 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, |
| 4443 | BDRV_REQ_ZERO_WRITE | flags, |
| 4444 | cb, opaque, true); |
| 4445 | } |
| 4446 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4447 | |
| 4448 | typedef struct MultiwriteCB { |
| 4449 | int error; |
| 4450 | int num_requests; |
| 4451 | int num_callbacks; |
| 4452 | struct { |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4453 | BlockCompletionFunc *cb; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4454 | void *opaque; |
| 4455 | QEMUIOVector *free_qiov; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4456 | } callbacks[]; |
| 4457 | } MultiwriteCB; |
| 4458 | |
| 4459 | static void multiwrite_user_cb(MultiwriteCB *mcb) |
| 4460 | { |
| 4461 | int i; |
| 4462 | |
| 4463 | for (i = 0; i < mcb->num_callbacks; i++) { |
| 4464 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
Stefan Hajnoczi | 1e1ea48 | 2010-04-21 20:35:45 +0100 | [diff] [blame] | 4465 | if (mcb->callbacks[i].free_qiov) { |
| 4466 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
| 4467 | } |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4468 | g_free(mcb->callbacks[i].free_qiov); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4469 | } |
| 4470 | } |
| 4471 | |
| 4472 | static void multiwrite_cb(void *opaque, int ret) |
| 4473 | { |
| 4474 | MultiwriteCB *mcb = opaque; |
| 4475 | |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 4476 | trace_multiwrite_cb(mcb, ret); |
| 4477 | |
Kevin Wolf | cb6d3ca | 2010-04-01 22:48:44 +0200 | [diff] [blame] | 4478 | if (ret < 0 && !mcb->error) { |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4479 | mcb->error = ret; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4480 | } |
| 4481 | |
| 4482 | mcb->num_requests--; |
| 4483 | if (mcb->num_requests == 0) { |
Kevin Wolf | de189a1 | 2010-07-01 16:08:51 +0200 | [diff] [blame] | 4484 | multiwrite_user_cb(mcb); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4485 | g_free(mcb); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4486 | } |
| 4487 | } |
| 4488 | |
| 4489 | static int multiwrite_req_compare(const void *a, const void *b) |
| 4490 | { |
Christoph Hellwig | 77be436 | 2010-05-19 20:53:10 +0200 | [diff] [blame] | 4491 | const BlockRequest *req1 = a, *req2 = b; |
| 4492 | |
| 4493 | /* |
| 4494 | * Note that we can't simply subtract req2->sector from req1->sector |
| 4495 | * here as that could overflow the return value. |
| 4496 | */ |
| 4497 | if (req1->sector > req2->sector) { |
| 4498 | return 1; |
| 4499 | } else if (req1->sector < req2->sector) { |
| 4500 | return -1; |
| 4501 | } else { |
| 4502 | return 0; |
| 4503 | } |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4504 | } |
| 4505 | |
| 4506 | /* |
| 4507 | * Takes a bunch of requests and tries to merge them. Returns the number of |
| 4508 | * requests that remain after merging. |
| 4509 | */ |
| 4510 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
| 4511 | int num_reqs, MultiwriteCB *mcb) |
| 4512 | { |
| 4513 | int i, outidx; |
| 4514 | |
| 4515 | // Sort requests by start sector |
| 4516 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); |
| 4517 | |
| 4518 | // Check if adjacent requests touch the same clusters. If so, combine them, |
| 4519 | // filling up gaps with zero sectors. |
| 4520 | outidx = 0; |
| 4521 | for (i = 1; i < num_reqs; i++) { |
| 4522 | int merge = 0; |
| 4523 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
| 4524 | |
Paolo Bonzini | b6a127a | 2012-02-21 16:43:52 +0100 | [diff] [blame] | 4525 | // Handle exactly sequential writes and overlapping writes. |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4526 | if (reqs[i].sector <= oldreq_last) { |
| 4527 | merge = 1; |
| 4528 | } |
| 4529 | |
Christoph Hellwig | e2a305f | 2010-01-26 14:49:08 +0100 | [diff] [blame] | 4530 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
| 4531 | merge = 0; |
| 4532 | } |
| 4533 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4534 | if (merge) { |
| 4535 | size_t size; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4536 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4537 | qemu_iovec_init(qiov, |
| 4538 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); |
| 4539 | |
| 4540 | // Add the first request to the merged one. If the requests are |
| 4541 | // overlapping, drop the last sectors of the first request. |
| 4542 | size = (reqs[i].sector - reqs[outidx].sector) << 9; |
Michael Tokarev | 1b093c4 | 2012-03-12 21:28:06 +0400 | [diff] [blame] | 4543 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4544 | |
Paolo Bonzini | b6a127a | 2012-02-21 16:43:52 +0100 | [diff] [blame] | 4545 | // We should need to add any zeros between the two requests |
| 4546 | assert (reqs[i].sector <= oldreq_last); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4547 | |
| 4548 | // Add the second request |
Michael Tokarev | 1b093c4 | 2012-03-12 21:28:06 +0400 | [diff] [blame] | 4549 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4550 | |
Stefan Hajnoczi | 391827e | 2014-07-30 09:53:30 +0100 | [diff] [blame] | 4551 | // Add tail of first request, if necessary |
| 4552 | if (qiov->size < reqs[outidx].qiov->size) { |
| 4553 | qemu_iovec_concat(qiov, reqs[outidx].qiov, qiov->size, |
| 4554 | reqs[outidx].qiov->size - qiov->size); |
| 4555 | } |
| 4556 | |
Kevin Wolf | cbf1dff | 2010-05-21 11:09:42 +0200 | [diff] [blame] | 4557 | reqs[outidx].nb_sectors = qiov->size >> 9; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4558 | reqs[outidx].qiov = qiov; |
| 4559 | |
| 4560 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
| 4561 | } else { |
| 4562 | outidx++; |
| 4563 | reqs[outidx].sector = reqs[i].sector; |
| 4564 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
| 4565 | reqs[outidx].qiov = reqs[i].qiov; |
| 4566 | } |
| 4567 | } |
| 4568 | |
| 4569 | return outidx + 1; |
| 4570 | } |
| 4571 | |
| 4572 | /* |
| 4573 | * Submit multiple AIO write requests at once. |
| 4574 | * |
| 4575 | * On success, the function returns 0 and all requests in the reqs array have |
| 4576 | * been submitted. In error case this function returns -1, and any of the |
| 4577 | * requests may or may not be submitted yet. In particular, this means that the |
| 4578 | * callback will be called for some of the requests, for others it won't. The |
| 4579 | * caller must check the error field of the BlockRequest to wait for the right |
| 4580 | * callbacks (if error != 0, no callback will be called). |
| 4581 | * |
| 4582 | * The implementation may modify the contents of the reqs array, e.g. to merge |
| 4583 | * requests. However, the fields opaque and error are left unmodified as they |
| 4584 | * are used to signal failure for a single request to the caller. |
| 4585 | */ |
| 4586 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
| 4587 | { |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4588 | MultiwriteCB *mcb; |
| 4589 | int i; |
| 4590 | |
Ryan Harper | 301db7c | 2011-03-07 10:01:04 -0600 | [diff] [blame] | 4591 | /* don't submit writes if we don't have a medium */ |
| 4592 | if (bs->drv == NULL) { |
| 4593 | for (i = 0; i < num_reqs; i++) { |
| 4594 | reqs[i].error = -ENOMEDIUM; |
| 4595 | } |
| 4596 | return -1; |
| 4597 | } |
| 4598 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4599 | if (num_reqs == 0) { |
| 4600 | return 0; |
| 4601 | } |
| 4602 | |
| 4603 | // Create MultiwriteCB structure |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4604 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4605 | mcb->num_requests = 0; |
| 4606 | mcb->num_callbacks = num_reqs; |
| 4607 | |
| 4608 | for (i = 0; i < num_reqs; i++) { |
| 4609 | mcb->callbacks[i].cb = reqs[i].cb; |
| 4610 | mcb->callbacks[i].opaque = reqs[i].opaque; |
| 4611 | } |
| 4612 | |
| 4613 | // Check for mergable requests |
| 4614 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
| 4615 | |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 4616 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
| 4617 | |
Paolo Bonzini | df9309f | 2011-11-14 17:50:50 +0100 | [diff] [blame] | 4618 | /* Run the aio requests. */ |
| 4619 | mcb->num_requests = num_reqs; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4620 | for (i = 0; i < num_reqs; i++) { |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4621 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
| 4622 | reqs[i].nb_sectors, reqs[i].flags, |
| 4623 | multiwrite_cb, mcb, |
| 4624 | true); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4625 | } |
| 4626 | |
| 4627 | return 0; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4628 | } |
| 4629 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4630 | void bdrv_aio_cancel(BlockAIOCB *acb) |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4631 | { |
Fam Zheng | ca5fd11 | 2014-09-11 13:41:27 +0800 | [diff] [blame] | 4632 | qemu_aio_ref(acb); |
| 4633 | bdrv_aio_cancel_async(acb); |
| 4634 | while (acb->refcnt > 1) { |
| 4635 | if (acb->aiocb_info->get_aio_context) { |
| 4636 | aio_poll(acb->aiocb_info->get_aio_context(acb), true); |
| 4637 | } else if (acb->bs) { |
| 4638 | aio_poll(bdrv_get_aio_context(acb->bs), true); |
| 4639 | } else { |
| 4640 | abort(); |
Fam Zheng | 02c50ef | 2014-09-11 13:41:09 +0800 | [diff] [blame] | 4641 | } |
Fam Zheng | 02c50ef | 2014-09-11 13:41:09 +0800 | [diff] [blame] | 4642 | } |
Fam Zheng | 8007429 | 2014-09-11 13:41:28 +0800 | [diff] [blame] | 4643 | qemu_aio_unref(acb); |
Fam Zheng | 02c50ef | 2014-09-11 13:41:09 +0800 | [diff] [blame] | 4644 | } |
| 4645 | |
| 4646 | /* Async version of aio cancel. The caller is not blocked if the acb implements |
| 4647 | * cancel_async, otherwise we do nothing and let the request normally complete. |
| 4648 | * In either case the completion callback must be called. */ |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4649 | void bdrv_aio_cancel_async(BlockAIOCB *acb) |
Fam Zheng | 02c50ef | 2014-09-11 13:41:09 +0800 | [diff] [blame] | 4650 | { |
| 4651 | if (acb->aiocb_info->cancel_async) { |
| 4652 | acb->aiocb_info->cancel_async(acb); |
| 4653 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4654 | } |
| 4655 | |
| 4656 | /**************************************************************/ |
| 4657 | /* async block device emulation */ |
| 4658 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4659 | typedef struct BlockAIOCBSync { |
| 4660 | BlockAIOCB common; |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4661 | QEMUBH *bh; |
| 4662 | int ret; |
| 4663 | /* vector translation state */ |
| 4664 | QEMUIOVector *qiov; |
| 4665 | uint8_t *bounce; |
| 4666 | int is_write; |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4667 | } BlockAIOCBSync; |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4668 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4669 | static const AIOCBInfo bdrv_em_aiocb_info = { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4670 | .aiocb_size = sizeof(BlockAIOCBSync), |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4671 | }; |
| 4672 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4673 | static void bdrv_aio_bh_cb(void *opaque) |
bellard | beac80c | 2006-06-26 20:08:57 +0000 | [diff] [blame] | 4674 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4675 | BlockAIOCBSync *acb = opaque; |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4676 | |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 4677 | if (!acb->is_write && acb->ret >= 0) { |
Michael Tokarev | 0339614 | 2012-06-07 20:17:55 +0400 | [diff] [blame] | 4678 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 4679 | } |
aliguori | ceb42de | 2009-04-07 18:43:28 +0000 | [diff] [blame] | 4680 | qemu_vfree(acb->bounce); |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4681 | acb->common.cb(acb->common.opaque, acb->ret); |
Dor Laor | 6a7ad29 | 2009-06-01 12:07:23 +0300 | [diff] [blame] | 4682 | qemu_bh_delete(acb->bh); |
Avi Kivity | 36afc45 | 2009-06-23 16:20:36 +0300 | [diff] [blame] | 4683 | acb->bh = NULL; |
Fam Zheng | 8007429 | 2014-09-11 13:41:28 +0800 | [diff] [blame] | 4684 | qemu_aio_unref(acb); |
bellard | beac80c | 2006-06-26 20:08:57 +0000 | [diff] [blame] | 4685 | } |
bellard | beac80c | 2006-06-26 20:08:57 +0000 | [diff] [blame] | 4686 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4687 | static BlockAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
| 4688 | int64_t sector_num, |
| 4689 | QEMUIOVector *qiov, |
| 4690 | int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4691 | BlockCompletionFunc *cb, |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4692 | void *opaque, |
| 4693 | int is_write) |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4694 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4695 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4696 | BlockAIOCBSync *acb; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4697 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4698 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4699 | acb->is_write = is_write; |
| 4700 | acb->qiov = qiov; |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 4701 | acb->bounce = qemu_try_blockalign(bs, qiov->size); |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4702 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4703 | |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 4704 | if (acb->bounce == NULL) { |
| 4705 | acb->ret = -ENOMEM; |
| 4706 | } else if (is_write) { |
Michael Tokarev | d5e6b16 | 2012-06-07 20:21:06 +0400 | [diff] [blame] | 4707 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
Stefan Hajnoczi | 1ed20ac | 2011-10-13 13:08:21 +0100 | [diff] [blame] | 4708 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4709 | } else { |
Stefan Hajnoczi | 1ed20ac | 2011-10-13 13:08:21 +0100 | [diff] [blame] | 4710 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4711 | } |
| 4712 | |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4713 | qemu_bh_schedule(acb->bh); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4714 | |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4715 | return &acb->common; |
pbrook | 7a6cba6 | 2006-06-04 11:39:07 +0000 | [diff] [blame] | 4716 | } |
| 4717 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4718 | static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4719 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4720 | BlockCompletionFunc *cb, void *opaque) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4721 | { |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4722 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4723 | } |
| 4724 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4725 | static BlockAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4726 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4727 | BlockCompletionFunc *cb, void *opaque) |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4728 | { |
| 4729 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 4730 | } |
| 4731 | |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4732 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4733 | typedef struct BlockAIOCBCoroutine { |
| 4734 | BlockAIOCB common; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4735 | BlockRequest req; |
| 4736 | bool is_write; |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4737 | bool *done; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4738 | QEMUBH* bh; |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4739 | } BlockAIOCBCoroutine; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4740 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4741 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4742 | .aiocb_size = sizeof(BlockAIOCBCoroutine), |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4743 | }; |
| 4744 | |
Paolo Bonzini | 35246a6 | 2011-10-14 10:41:29 +0200 | [diff] [blame] | 4745 | static void bdrv_co_em_bh(void *opaque) |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4746 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4747 | BlockAIOCBCoroutine *acb = opaque; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4748 | |
| 4749 | acb->common.cb(acb->common.opaque, acb->req.error); |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4750 | |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4751 | qemu_bh_delete(acb->bh); |
Fam Zheng | 8007429 | 2014-09-11 13:41:28 +0800 | [diff] [blame] | 4752 | qemu_aio_unref(acb); |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4753 | } |
| 4754 | |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4755 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
| 4756 | static void coroutine_fn bdrv_co_do_rw(void *opaque) |
| 4757 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4758 | BlockAIOCBCoroutine *acb = opaque; |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4759 | BlockDriverState *bs = acb->common.bs; |
| 4760 | |
| 4761 | if (!acb->is_write) { |
| 4762 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4763 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4764 | } else { |
| 4765 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4766 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4767 | } |
| 4768 | |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4769 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4770 | qemu_bh_schedule(acb->bh); |
| 4771 | } |
| 4772 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4773 | static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
| 4774 | int64_t sector_num, |
| 4775 | QEMUIOVector *qiov, |
| 4776 | int nb_sectors, |
| 4777 | BdrvRequestFlags flags, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4778 | BlockCompletionFunc *cb, |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4779 | void *opaque, |
| 4780 | bool is_write) |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4781 | { |
| 4782 | Coroutine *co; |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4783 | BlockAIOCBCoroutine *acb; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4784 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4785 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4786 | acb->req.sector = sector_num; |
| 4787 | acb->req.nb_sectors = nb_sectors; |
| 4788 | acb->req.qiov = qiov; |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4789 | acb->req.flags = flags; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4790 | acb->is_write = is_write; |
| 4791 | |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4792 | co = qemu_coroutine_create(bdrv_co_do_rw); |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4793 | qemu_coroutine_enter(co, acb); |
| 4794 | |
| 4795 | return &acb->common; |
| 4796 | } |
| 4797 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4798 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4799 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4800 | BlockAIOCBCoroutine *acb = opaque; |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4801 | BlockDriverState *bs = acb->common.bs; |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4802 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4803 | acb->req.error = bdrv_co_flush(bs); |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4804 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4805 | qemu_bh_schedule(acb->bh); |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4806 | } |
| 4807 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4808 | BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4809 | BlockCompletionFunc *cb, void *opaque) |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4810 | { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4811 | trace_bdrv_aio_flush(bs, opaque); |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4812 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4813 | Coroutine *co; |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4814 | BlockAIOCBCoroutine *acb; |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4815 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4816 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4817 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4818 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
| 4819 | qemu_coroutine_enter(co, acb); |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4820 | |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4821 | return &acb->common; |
| 4822 | } |
| 4823 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4824 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
| 4825 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4826 | BlockAIOCBCoroutine *acb = opaque; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4827 | BlockDriverState *bs = acb->common.bs; |
| 4828 | |
| 4829 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4830 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4831 | qemu_bh_schedule(acb->bh); |
| 4832 | } |
| 4833 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4834 | BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4835 | int64_t sector_num, int nb_sectors, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4836 | BlockCompletionFunc *cb, void *opaque) |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4837 | { |
| 4838 | Coroutine *co; |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4839 | BlockAIOCBCoroutine *acb; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4840 | |
| 4841 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); |
| 4842 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4843 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4844 | acb->req.sector = sector_num; |
| 4845 | acb->req.nb_sectors = nb_sectors; |
| 4846 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
| 4847 | qemu_coroutine_enter(co, acb); |
| 4848 | |
| 4849 | return &acb->common; |
| 4850 | } |
| 4851 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4852 | void bdrv_init(void) |
| 4853 | { |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 4854 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4855 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4856 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 4857 | void bdrv_init_with_whitelist(void) |
| 4858 | { |
| 4859 | use_bdrv_whitelist = 1; |
| 4860 | bdrv_init(); |
| 4861 | } |
| 4862 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4863 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 4864 | BlockCompletionFunc *cb, void *opaque) |
aliguori | 6bbff9a | 2009-03-20 18:25:59 +0000 | [diff] [blame] | 4865 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4866 | BlockAIOCB *acb; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4867 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4868 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
| 4869 | acb->aiocb_info = aiocb_info; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4870 | acb->bs = bs; |
| 4871 | acb->cb = cb; |
| 4872 | acb->opaque = opaque; |
Fam Zheng | f197fe2 | 2014-09-11 13:41:08 +0800 | [diff] [blame] | 4873 | acb->refcnt = 1; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4874 | return acb; |
| 4875 | } |
| 4876 | |
Fam Zheng | f197fe2 | 2014-09-11 13:41:08 +0800 | [diff] [blame] | 4877 | void qemu_aio_ref(void *p) |
| 4878 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4879 | BlockAIOCB *acb = p; |
Fam Zheng | f197fe2 | 2014-09-11 13:41:08 +0800 | [diff] [blame] | 4880 | acb->refcnt++; |
| 4881 | } |
| 4882 | |
Fam Zheng | 8007429 | 2014-09-11 13:41:28 +0800 | [diff] [blame] | 4883 | void qemu_aio_unref(void *p) |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4884 | { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4885 | BlockAIOCB *acb = p; |
Fam Zheng | f197fe2 | 2014-09-11 13:41:08 +0800 | [diff] [blame] | 4886 | assert(acb->refcnt > 0); |
| 4887 | if (--acb->refcnt == 0) { |
| 4888 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
| 4889 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4890 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4891 | |
| 4892 | /**************************************************************/ |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4893 | /* Coroutine block device emulation */ |
| 4894 | |
| 4895 | typedef struct CoroutineIOCompletion { |
| 4896 | Coroutine *coroutine; |
| 4897 | int ret; |
| 4898 | } CoroutineIOCompletion; |
| 4899 | |
| 4900 | static void bdrv_co_io_em_complete(void *opaque, int ret) |
| 4901 | { |
| 4902 | CoroutineIOCompletion *co = opaque; |
| 4903 | |
| 4904 | co->ret = ret; |
| 4905 | qemu_coroutine_enter(co->coroutine, NULL); |
| 4906 | } |
| 4907 | |
| 4908 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, |
| 4909 | int nb_sectors, QEMUIOVector *iov, |
| 4910 | bool is_write) |
| 4911 | { |
| 4912 | CoroutineIOCompletion co = { |
| 4913 | .coroutine = qemu_coroutine_self(), |
| 4914 | }; |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4915 | BlockAIOCB *acb; |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4916 | |
| 4917 | if (is_write) { |
Stefan Hajnoczi | a652d16 | 2011-10-05 17:17:02 +0100 | [diff] [blame] | 4918 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
| 4919 | bdrv_co_io_em_complete, &co); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4920 | } else { |
Stefan Hajnoczi | a652d16 | 2011-10-05 17:17:02 +0100 | [diff] [blame] | 4921 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
| 4922 | bdrv_co_io_em_complete, &co); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4923 | } |
| 4924 | |
Stefan Hajnoczi | 59370aa | 2011-09-30 17:34:58 +0100 | [diff] [blame] | 4925 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4926 | if (!acb) { |
| 4927 | return -EIO; |
| 4928 | } |
| 4929 | qemu_coroutine_yield(); |
| 4930 | |
| 4931 | return co.ret; |
| 4932 | } |
| 4933 | |
| 4934 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
| 4935 | int64_t sector_num, int nb_sectors, |
| 4936 | QEMUIOVector *iov) |
| 4937 | { |
| 4938 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); |
| 4939 | } |
| 4940 | |
| 4941 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
| 4942 | int64_t sector_num, int nb_sectors, |
| 4943 | QEMUIOVector *iov) |
| 4944 | { |
| 4945 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); |
| 4946 | } |
| 4947 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4948 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 4949 | { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4950 | RwCo *rwco = opaque; |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 4951 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4952 | rwco->ret = bdrv_co_flush(rwco->bs); |
| 4953 | } |
| 4954 | |
| 4955 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) |
| 4956 | { |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4957 | int ret; |
| 4958 | |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4959 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4960 | return 0; |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4961 | } |
| 4962 | |
Kevin Wolf | ca71636 | 2011-11-10 18:13:59 +0100 | [diff] [blame] | 4963 | /* Write back cached data to the OS even with cache=unsafe */ |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4964 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4965 | if (bs->drv->bdrv_co_flush_to_os) { |
| 4966 | ret = bs->drv->bdrv_co_flush_to_os(bs); |
| 4967 | if (ret < 0) { |
| 4968 | return ret; |
| 4969 | } |
| 4970 | } |
| 4971 | |
Kevin Wolf | ca71636 | 2011-11-10 18:13:59 +0100 | [diff] [blame] | 4972 | /* But don't actually force it to the disk with cache=unsafe */ |
| 4973 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
Kevin Wolf | d4c8232 | 2012-08-15 12:52:45 +0200 | [diff] [blame] | 4974 | goto flush_parent; |
Kevin Wolf | ca71636 | 2011-11-10 18:13:59 +0100 | [diff] [blame] | 4975 | } |
| 4976 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4977 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4978 | if (bs->drv->bdrv_co_flush_to_disk) { |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4979 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4980 | } else if (bs->drv->bdrv_aio_flush) { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 4981 | BlockAIOCB *acb; |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4982 | CoroutineIOCompletion co = { |
| 4983 | .coroutine = qemu_coroutine_self(), |
| 4984 | }; |
| 4985 | |
| 4986 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); |
| 4987 | if (acb == NULL) { |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4988 | ret = -EIO; |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4989 | } else { |
| 4990 | qemu_coroutine_yield(); |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4991 | ret = co.ret; |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4992 | } |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4993 | } else { |
| 4994 | /* |
| 4995 | * Some block drivers always operate in either writethrough or unsafe |
| 4996 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't |
| 4997 | * know how the server works (because the behaviour is hardcoded or |
| 4998 | * depends on server-side configuration), so we can't ensure that |
| 4999 | * everything is safe on disk. Returning an error doesn't work because |
| 5000 | * that would break guests even if the server operates in writethrough |
| 5001 | * mode. |
| 5002 | * |
| 5003 | * Let's hope the user knows what he's doing. |
| 5004 | */ |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 5005 | ret = 0; |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 5006 | } |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 5007 | if (ret < 0) { |
| 5008 | return ret; |
| 5009 | } |
| 5010 | |
| 5011 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH |
| 5012 | * in the case of cache=unsafe, so there are no useless flushes. |
| 5013 | */ |
Kevin Wolf | d4c8232 | 2012-08-15 12:52:45 +0200 | [diff] [blame] | 5014 | flush_parent: |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 5015 | return bdrv_co_flush(bs->file); |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 5016 | } |
| 5017 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5018 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5019 | { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5020 | Error *local_err = NULL; |
| 5021 | int ret; |
| 5022 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5023 | if (!bs->drv) { |
| 5024 | return; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5025 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5026 | |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 5027 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
| 5028 | return; |
| 5029 | } |
| 5030 | bs->open_flags &= ~BDRV_O_INCOMING; |
| 5031 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5032 | if (bs->drv->bdrv_invalidate_cache) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5033 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5034 | } else if (bs->file) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5035 | bdrv_invalidate_cache(bs->file, &local_err); |
| 5036 | } |
| 5037 | if (local_err) { |
| 5038 | error_propagate(errp, local_err); |
| 5039 | return; |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5040 | } |
| 5041 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5042 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 5043 | if (ret < 0) { |
| 5044 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 5045 | return; |
| 5046 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5047 | } |
| 5048 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5049 | void bdrv_invalidate_cache_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5050 | { |
| 5051 | BlockDriverState *bs; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5052 | Error *local_err = NULL; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5053 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 5054 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5055 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5056 | |
| 5057 | aio_context_acquire(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5058 | bdrv_invalidate_cache(bs, &local_err); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5059 | aio_context_release(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5060 | if (local_err) { |
| 5061 | error_propagate(errp, local_err); |
| 5062 | return; |
| 5063 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5064 | } |
| 5065 | } |
| 5066 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 5067 | int bdrv_flush(BlockDriverState *bs) |
| 5068 | { |
| 5069 | Coroutine *co; |
| 5070 | RwCo rwco = { |
| 5071 | .bs = bs, |
| 5072 | .ret = NOT_DONE, |
| 5073 | }; |
| 5074 | |
| 5075 | if (qemu_in_coroutine()) { |
| 5076 | /* Fast-path if already in coroutine context */ |
| 5077 | bdrv_flush_co_entry(&rwco); |
| 5078 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5079 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5080 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 5081 | co = qemu_coroutine_create(bdrv_flush_co_entry); |
| 5082 | qemu_coroutine_enter(co, &rwco); |
| 5083 | while (rwco.ret == NOT_DONE) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5084 | aio_poll(aio_context, true); |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 5085 | } |
| 5086 | } |
| 5087 | |
| 5088 | return rwco.ret; |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 5089 | } |
| 5090 | |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 5091 | typedef struct DiscardCo { |
| 5092 | BlockDriverState *bs; |
| 5093 | int64_t sector_num; |
| 5094 | int nb_sectors; |
| 5095 | int ret; |
| 5096 | } DiscardCo; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5097 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
| 5098 | { |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 5099 | DiscardCo *rwco = opaque; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5100 | |
| 5101 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); |
| 5102 | } |
| 5103 | |
Peter Lieven | 6f14da5 | 2013-10-24 12:06:59 +0200 | [diff] [blame] | 5104 | /* if no limit is specified in the BlockLimits use a default |
| 5105 | * of 32768 512-byte sectors (16 MiB) per request. |
| 5106 | */ |
| 5107 | #define MAX_DISCARD_DEFAULT 32768 |
| 5108 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5109 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
| 5110 | int nb_sectors) |
| 5111 | { |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5112 | int max_discard; |
| 5113 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5114 | if (!bs->drv) { |
| 5115 | return -ENOMEDIUM; |
| 5116 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
| 5117 | return -EIO; |
| 5118 | } else if (bs->read_only) { |
| 5119 | return -EROFS; |
Paolo Bonzini | df702c9 | 2013-01-14 16:26:58 +0100 | [diff] [blame] | 5120 | } |
| 5121 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5122 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
Paolo Bonzini | df702c9 | 2013-01-14 16:26:58 +0100 | [diff] [blame] | 5123 | |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 5124 | /* Do nothing if disabled. */ |
| 5125 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
| 5126 | return 0; |
| 5127 | } |
| 5128 | |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5129 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5130 | return 0; |
| 5131 | } |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5132 | |
| 5133 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
| 5134 | while (nb_sectors > 0) { |
| 5135 | int ret; |
| 5136 | int num = nb_sectors; |
| 5137 | |
| 5138 | /* align request */ |
| 5139 | if (bs->bl.discard_alignment && |
| 5140 | num >= bs->bl.discard_alignment && |
| 5141 | sector_num % bs->bl.discard_alignment) { |
| 5142 | if (num > bs->bl.discard_alignment) { |
| 5143 | num = bs->bl.discard_alignment; |
| 5144 | } |
| 5145 | num -= sector_num % bs->bl.discard_alignment; |
| 5146 | } |
| 5147 | |
| 5148 | /* limit request size */ |
| 5149 | if (num > max_discard) { |
| 5150 | num = max_discard; |
| 5151 | } |
| 5152 | |
| 5153 | if (bs->drv->bdrv_co_discard) { |
| 5154 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
| 5155 | } else { |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 5156 | BlockAIOCB *acb; |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5157 | CoroutineIOCompletion co = { |
| 5158 | .coroutine = qemu_coroutine_self(), |
| 5159 | }; |
| 5160 | |
| 5161 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, |
| 5162 | bdrv_co_io_em_complete, &co); |
| 5163 | if (acb == NULL) { |
| 5164 | return -EIO; |
| 5165 | } else { |
| 5166 | qemu_coroutine_yield(); |
| 5167 | ret = co.ret; |
| 5168 | } |
| 5169 | } |
Paolo Bonzini | 7ce2101 | 2013-11-22 13:39:47 +0100 | [diff] [blame] | 5170 | if (ret && ret != -ENOTSUP) { |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5171 | return ret; |
| 5172 | } |
| 5173 | |
| 5174 | sector_num += num; |
| 5175 | nb_sectors -= num; |
| 5176 | } |
| 5177 | return 0; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5178 | } |
| 5179 | |
| 5180 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
| 5181 | { |
| 5182 | Coroutine *co; |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 5183 | DiscardCo rwco = { |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5184 | .bs = bs, |
| 5185 | .sector_num = sector_num, |
| 5186 | .nb_sectors = nb_sectors, |
| 5187 | .ret = NOT_DONE, |
| 5188 | }; |
| 5189 | |
| 5190 | if (qemu_in_coroutine()) { |
| 5191 | /* Fast-path if already in coroutine context */ |
| 5192 | bdrv_discard_co_entry(&rwco); |
| 5193 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5194 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5195 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5196 | co = qemu_coroutine_create(bdrv_discard_co_entry); |
| 5197 | qemu_coroutine_enter(co, &rwco); |
| 5198 | while (rwco.ret == NOT_DONE) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5199 | aio_poll(aio_context, true); |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5200 | } |
| 5201 | } |
| 5202 | |
| 5203 | return rwco.ret; |
| 5204 | } |
| 5205 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 5206 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5207 | /* removable device support */ |
| 5208 | |
| 5209 | /** |
| 5210 | * Return TRUE if the media is present |
| 5211 | */ |
| 5212 | int bdrv_is_inserted(BlockDriverState *bs) |
| 5213 | { |
| 5214 | BlockDriver *drv = bs->drv; |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 5215 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5216 | if (!drv) |
| 5217 | return 0; |
| 5218 | if (!drv->bdrv_is_inserted) |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 5219 | return 1; |
| 5220 | return drv->bdrv_is_inserted(bs); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5221 | } |
| 5222 | |
| 5223 | /** |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 5224 | * Return whether the media changed since the last call to this |
| 5225 | * function, or -ENOTSUP if we don't know. Most drivers don't know. |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5226 | */ |
| 5227 | int bdrv_media_changed(BlockDriverState *bs) |
| 5228 | { |
| 5229 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5230 | |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 5231 | if (drv && drv->bdrv_media_changed) { |
| 5232 | return drv->bdrv_media_changed(bs); |
| 5233 | } |
| 5234 | return -ENOTSUP; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5235 | } |
| 5236 | |
| 5237 | /** |
| 5238 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 5239 | */ |
Luiz Capitulino | f36f394 | 2012-02-03 16:24:53 -0200 | [diff] [blame] | 5240 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5241 | { |
| 5242 | BlockDriver *drv = bs->drv; |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 5243 | const char *device_name; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5244 | |
Markus Armbruster | 822e1cd | 2011-07-20 18:23:42 +0200 | [diff] [blame] | 5245 | if (drv && drv->bdrv_eject) { |
| 5246 | drv->bdrv_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5247 | } |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 5248 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 5249 | device_name = bdrv_get_device_name(bs); |
| 5250 | if (device_name[0] != '\0') { |
| 5251 | qapi_event_send_device_tray_moved(device_name, |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 5252 | eject_flag, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 5253 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5254 | } |
| 5255 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5256 | /** |
| 5257 | * Lock or unlock the media (if it is locked, the user won't be able |
| 5258 | * to eject it manually). |
| 5259 | */ |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5260 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5261 | { |
| 5262 | BlockDriver *drv = bs->drv; |
| 5263 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5264 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 5265 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5266 | if (drv && drv->bdrv_lock_medium) { |
| 5267 | drv->bdrv_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5268 | } |
| 5269 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 5270 | |
| 5271 | /* needed for generic scsi interface */ |
| 5272 | |
| 5273 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 5274 | { |
| 5275 | BlockDriver *drv = bs->drv; |
| 5276 | |
| 5277 | if (drv && drv->bdrv_ioctl) |
| 5278 | return drv->bdrv_ioctl(bs, req, buf); |
| 5279 | return -ENOTSUP; |
| 5280 | } |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5281 | |
Markus Armbruster | 7c84b1b | 2014-10-07 13:59:14 +0200 | [diff] [blame] | 5282 | BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
aliguori | 221f715 | 2009-03-28 17:28:41 +0000 | [diff] [blame] | 5283 | unsigned long int req, void *buf, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 5284 | BlockCompletionFunc *cb, void *opaque) |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5285 | { |
aliguori | 221f715 | 2009-03-28 17:28:41 +0000 | [diff] [blame] | 5286 | BlockDriver *drv = bs->drv; |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5287 | |
aliguori | 221f715 | 2009-03-28 17:28:41 +0000 | [diff] [blame] | 5288 | if (drv && drv->bdrv_aio_ioctl) |
| 5289 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); |
| 5290 | return NULL; |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5291 | } |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 5292 | |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 5293 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
Markus Armbruster | 7b6f930 | 2011-09-06 18:58:56 +0200 | [diff] [blame] | 5294 | { |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 5295 | bs->guest_block_size = align; |
Markus Armbruster | 7b6f930 | 2011-09-06 18:58:56 +0200 | [diff] [blame] | 5296 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5297 | |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 5298 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
| 5299 | { |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5300 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 5301 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5302 | |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 5303 | void *qemu_try_blockalign(BlockDriverState *bs, size_t size) |
| 5304 | { |
| 5305 | size_t align = bdrv_opt_mem_align(bs); |
| 5306 | |
| 5307 | /* Ensure that NULL is never returned on success */ |
| 5308 | assert(align > 0); |
| 5309 | if (size == 0) { |
| 5310 | size = align; |
| 5311 | } |
| 5312 | |
| 5313 | return qemu_try_memalign(align, size); |
| 5314 | } |
| 5315 | |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5316 | /* |
| 5317 | * Check if all memory in this vector is sector aligned. |
| 5318 | */ |
| 5319 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) |
| 5320 | { |
| 5321 | int i; |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5322 | size_t alignment = bdrv_opt_mem_align(bs); |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5323 | |
| 5324 | for (i = 0; i < qiov->niov; i++) { |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5325 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5326 | return false; |
| 5327 | } |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5328 | if (qiov->iov[i].iov_len % alignment) { |
Kevin Wolf | 1ff735b | 2013-12-05 13:01:46 +0100 | [diff] [blame] | 5329 | return false; |
| 5330 | } |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5331 | } |
| 5332 | |
| 5333 | return true; |
| 5334 | } |
| 5335 | |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 5336 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity, |
| 5337 | Error **errp) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5338 | { |
| 5339 | int64_t bitmap_size; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5340 | BdrvDirtyBitmap *bitmap; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 5341 | |
Paolo Bonzini | 50717e9 | 2013-01-21 17:09:45 +0100 | [diff] [blame] | 5342 | assert((granularity & (granularity - 1)) == 0); |
| 5343 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5344 | granularity >>= BDRV_SECTOR_BITS; |
| 5345 | assert(granularity); |
Markus Armbruster | 57322b7 | 2014-06-26 13:23:22 +0200 | [diff] [blame] | 5346 | bitmap_size = bdrv_nb_sectors(bs); |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 5347 | if (bitmap_size < 0) { |
| 5348 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); |
| 5349 | errno = -bitmap_size; |
| 5350 | return NULL; |
| 5351 | } |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 5352 | bitmap = g_new0(BdrvDirtyBitmap, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5353 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); |
| 5354 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); |
| 5355 | return bitmap; |
| 5356 | } |
| 5357 | |
| 5358 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
| 5359 | { |
| 5360 | BdrvDirtyBitmap *bm, *next; |
| 5361 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { |
| 5362 | if (bm == bitmap) { |
| 5363 | QLIST_REMOVE(bitmap, list); |
| 5364 | hbitmap_free(bitmap->bitmap); |
| 5365 | g_free(bitmap); |
| 5366 | return; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 5367 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5368 | } |
| 5369 | } |
| 5370 | |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 5371 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
| 5372 | { |
| 5373 | BdrvDirtyBitmap *bm; |
| 5374 | BlockDirtyInfoList *list = NULL; |
| 5375 | BlockDirtyInfoList **plist = &list; |
| 5376 | |
| 5377 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 5378 | BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); |
| 5379 | BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 5380 | info->count = bdrv_get_dirty_count(bs, bm); |
| 5381 | info->granularity = |
| 5382 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); |
| 5383 | entry->value = info; |
| 5384 | *plist = entry; |
| 5385 | plist = &entry->next; |
| 5386 | } |
| 5387 | |
| 5388 | return list; |
| 5389 | } |
| 5390 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5391 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5392 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5393 | if (bitmap) { |
| 5394 | return hbitmap_get(bitmap->bitmap, sector); |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5395 | } else { |
| 5396 | return 0; |
| 5397 | } |
| 5398 | } |
| 5399 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5400 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
| 5401 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 5402 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5403 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 5404 | } |
| 5405 | |
| 5406 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, |
| 5407 | int nr_sectors) |
| 5408 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5409 | BdrvDirtyBitmap *bitmap; |
| 5410 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
| 5411 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
Paolo Bonzini | 8f0720e | 2013-01-21 17:09:41 +0100 | [diff] [blame] | 5412 | } |
Liran Schour | aaa0eb7 | 2010-01-26 10:31:48 +0200 | [diff] [blame] | 5413 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5414 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5415 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
| 5416 | { |
| 5417 | BdrvDirtyBitmap *bitmap; |
| 5418 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
| 5419 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); |
| 5420 | } |
| 5421 | } |
| 5422 | |
| 5423 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
| 5424 | { |
| 5425 | return hbitmap_count(bitmap->bitmap); |
| 5426 | } |
| 5427 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 5428 | /* Get a reference to bs */ |
| 5429 | void bdrv_ref(BlockDriverState *bs) |
| 5430 | { |
| 5431 | bs->refcnt++; |
| 5432 | } |
| 5433 | |
| 5434 | /* Release a previously grabbed reference to bs. |
| 5435 | * If after releasing, reference count is zero, the BlockDriverState is |
| 5436 | * deleted. */ |
| 5437 | void bdrv_unref(BlockDriverState *bs) |
| 5438 | { |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 5439 | if (!bs) { |
| 5440 | return; |
| 5441 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 5442 | assert(bs->refcnt > 0); |
| 5443 | if (--bs->refcnt == 0) { |
| 5444 | bdrv_delete(bs); |
| 5445 | } |
| 5446 | } |
| 5447 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5448 | struct BdrvOpBlocker { |
| 5449 | Error *reason; |
| 5450 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 5451 | }; |
| 5452 | |
| 5453 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 5454 | { |
| 5455 | BdrvOpBlocker *blocker; |
| 5456 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5457 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 5458 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
| 5459 | if (errp) { |
| 5460 | error_setg(errp, "Device '%s' is busy: %s", |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 5461 | bdrv_get_device_name(bs), |
| 5462 | error_get_pretty(blocker->reason)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5463 | } |
| 5464 | return true; |
| 5465 | } |
| 5466 | return false; |
| 5467 | } |
| 5468 | |
| 5469 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 5470 | { |
| 5471 | BdrvOpBlocker *blocker; |
| 5472 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5473 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 5474 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5475 | blocker->reason = reason; |
| 5476 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 5477 | } |
| 5478 | |
| 5479 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 5480 | { |
| 5481 | BdrvOpBlocker *blocker, *next; |
| 5482 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5483 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 5484 | if (blocker->reason == reason) { |
| 5485 | QLIST_REMOVE(blocker, list); |
| 5486 | g_free(blocker); |
| 5487 | } |
| 5488 | } |
| 5489 | } |
| 5490 | |
| 5491 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 5492 | { |
| 5493 | int i; |
| 5494 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5495 | bdrv_op_block(bs, i, reason); |
| 5496 | } |
| 5497 | } |
| 5498 | |
| 5499 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 5500 | { |
| 5501 | int i; |
| 5502 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5503 | bdrv_op_unblock(bs, i, reason); |
| 5504 | } |
| 5505 | } |
| 5506 | |
| 5507 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 5508 | { |
| 5509 | int i; |
| 5510 | |
| 5511 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5512 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 5513 | return false; |
| 5514 | } |
| 5515 | } |
| 5516 | return true; |
| 5517 | } |
| 5518 | |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5519 | void bdrv_iostatus_enable(BlockDriverState *bs) |
| 5520 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 5521 | bs->iostatus_enabled = true; |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 5522 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5523 | } |
| 5524 | |
| 5525 | /* The I/O status is only enabled if the drive explicitly |
| 5526 | * enables it _and_ the VM is configured to stop on errors */ |
| 5527 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) |
| 5528 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 5529 | return (bs->iostatus_enabled && |
Paolo Bonzini | 92aa5c6 | 2012-09-28 17:22:55 +0200 | [diff] [blame] | 5530 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
| 5531 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || |
| 5532 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5533 | } |
| 5534 | |
| 5535 | void bdrv_iostatus_disable(BlockDriverState *bs) |
| 5536 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 5537 | bs->iostatus_enabled = false; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5538 | } |
| 5539 | |
| 5540 | void bdrv_iostatus_reset(BlockDriverState *bs) |
| 5541 | { |
| 5542 | if (bdrv_iostatus_is_enabled(bs)) { |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 5543 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
Paolo Bonzini | 3bd293c | 2012-10-18 16:49:27 +0200 | [diff] [blame] | 5544 | if (bs->job) { |
| 5545 | block_job_iostatus_reset(bs->job); |
| 5546 | } |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5547 | } |
| 5548 | } |
| 5549 | |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5550 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
| 5551 | { |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 5552 | assert(bdrv_iostatus_is_enabled(bs)); |
| 5553 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 5554 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
| 5555 | BLOCK_DEVICE_IO_STATUS_FAILED; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5556 | } |
| 5557 | } |
| 5558 | |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5559 | void bdrv_img_create(const char *filename, const char *fmt, |
| 5560 | const char *base_filename, const char *base_fmt, |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5561 | char *options, uint64_t img_size, int flags, |
| 5562 | Error **errp, bool quiet) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5563 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5564 | QemuOptsList *create_opts = NULL; |
| 5565 | QemuOpts *opts = NULL; |
| 5566 | const char *backing_fmt, *backing_file; |
| 5567 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5568 | BlockDriver *drv, *proto_drv; |
Stefan Hajnoczi | 96df67d | 2011-01-24 09:32:20 +0000 | [diff] [blame] | 5569 | BlockDriver *backing_drv = NULL; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5570 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5571 | int ret = 0; |
| 5572 | |
| 5573 | /* Find driver and parse its options */ |
| 5574 | drv = bdrv_find_format(fmt); |
| 5575 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5576 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5577 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5578 | } |
| 5579 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 5580 | proto_drv = bdrv_find_protocol(filename, true); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5581 | if (!proto_drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5582 | error_setg(errp, "Unknown protocol '%s'", filename); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5583 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5584 | } |
| 5585 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5586 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
| 5587 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5588 | |
| 5589 | /* Create parameter list with default values */ |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5590 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
| 5591 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5592 | |
| 5593 | /* Parse -o options */ |
| 5594 | if (options) { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5595 | if (qemu_opts_do_parse(opts, options, NULL) != 0) { |
| 5596 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5597 | goto out; |
| 5598 | } |
| 5599 | } |
| 5600 | |
| 5601 | if (base_filename) { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5602 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5603 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 5604 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5605 | goto out; |
| 5606 | } |
| 5607 | } |
| 5608 | |
| 5609 | if (base_fmt) { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5610 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5611 | error_setg(errp, "Backing file format not supported for file " |
| 5612 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5613 | goto out; |
| 5614 | } |
| 5615 | } |
| 5616 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5617 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 5618 | if (backing_file) { |
| 5619 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5620 | error_setg(errp, "Error: Trying to create an image with the " |
| 5621 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 5622 | goto out; |
| 5623 | } |
| 5624 | } |
| 5625 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5626 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
| 5627 | if (backing_fmt) { |
| 5628 | backing_drv = bdrv_find_format(backing_fmt); |
Stefan Hajnoczi | 96df67d | 2011-01-24 09:32:20 +0000 | [diff] [blame] | 5629 | if (!backing_drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5630 | error_setg(errp, "Unknown backing file format '%s'", |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5631 | backing_fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5632 | goto out; |
| 5633 | } |
| 5634 | } |
| 5635 | |
| 5636 | // The size for the image must always be specified, with one exception: |
| 5637 | // If we are using a backing file, we can obtain the size from there |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5638 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
| 5639 | if (size == -1) { |
| 5640 | if (backing_file) { |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 5641 | BlockDriverState *bs; |
Markus Armbruster | 52bf1e7 | 2014-06-26 13:23:25 +0200 | [diff] [blame] | 5642 | int64_t size; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 5643 | int back_flags; |
| 5644 | |
| 5645 | /* backing files always opened read-only */ |
| 5646 | back_flags = |
| 5647 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5648 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 5649 | bs = NULL; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5650 | ret = bdrv_open(&bs, backing_file, NULL, NULL, back_flags, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5651 | backing_drv, &local_err); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5652 | if (ret < 0) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5653 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5654 | backing_file, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5655 | error_get_pretty(local_err)); |
| 5656 | error_free(local_err); |
| 5657 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5658 | goto out; |
| 5659 | } |
Markus Armbruster | 52bf1e7 | 2014-06-26 13:23:25 +0200 | [diff] [blame] | 5660 | size = bdrv_getlength(bs); |
| 5661 | if (size < 0) { |
| 5662 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 5663 | backing_file); |
| 5664 | bdrv_unref(bs); |
| 5665 | goto out; |
| 5666 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5667 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5668 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size); |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 5669 | |
| 5670 | bdrv_unref(bs); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5671 | } else { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5672 | error_setg(errp, "Image creation needs a size parameter"); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5673 | goto out; |
| 5674 | } |
| 5675 | } |
| 5676 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5677 | if (!quiet) { |
| 5678 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5679 | qemu_opts_print(opts); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5680 | puts(""); |
| 5681 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5682 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5683 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5684 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5685 | if (ret == -EFBIG) { |
| 5686 | /* This is generally a better message than whatever the driver would |
| 5687 | * deliver (especially because of the cluster_size_hint), since that |
| 5688 | * is most probably not much different from "image too large". */ |
| 5689 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5690 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5691 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5692 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5693 | error_setg(errp, "The image size is too large for file format '%s'" |
| 5694 | "%s", fmt, cluster_size_hint); |
| 5695 | error_free(local_err); |
| 5696 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5697 | } |
| 5698 | |
| 5699 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5700 | qemu_opts_del(opts); |
| 5701 | qemu_opts_free(create_opts); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 5702 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5703 | error_propagate(errp, local_err); |
| 5704 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5705 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 5706 | |
| 5707 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 5708 | { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5709 | return bs->aio_context; |
| 5710 | } |
| 5711 | |
| 5712 | void bdrv_detach_aio_context(BlockDriverState *bs) |
| 5713 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5714 | BdrvAioNotifier *baf; |
| 5715 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5716 | if (!bs->drv) { |
| 5717 | return; |
| 5718 | } |
| 5719 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5720 | QLIST_FOREACH(baf, &bs->aio_notifiers, list) { |
| 5721 | baf->detach_aio_context(baf->opaque); |
| 5722 | } |
| 5723 | |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 5724 | if (bs->io_limits_enabled) { |
| 5725 | throttle_detach_aio_context(&bs->throttle_state); |
| 5726 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5727 | if (bs->drv->bdrv_detach_aio_context) { |
| 5728 | bs->drv->bdrv_detach_aio_context(bs); |
| 5729 | } |
| 5730 | if (bs->file) { |
| 5731 | bdrv_detach_aio_context(bs->file); |
| 5732 | } |
| 5733 | if (bs->backing_hd) { |
| 5734 | bdrv_detach_aio_context(bs->backing_hd); |
| 5735 | } |
| 5736 | |
| 5737 | bs->aio_context = NULL; |
| 5738 | } |
| 5739 | |
| 5740 | void bdrv_attach_aio_context(BlockDriverState *bs, |
| 5741 | AioContext *new_context) |
| 5742 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5743 | BdrvAioNotifier *ban; |
| 5744 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5745 | if (!bs->drv) { |
| 5746 | return; |
| 5747 | } |
| 5748 | |
| 5749 | bs->aio_context = new_context; |
| 5750 | |
| 5751 | if (bs->backing_hd) { |
| 5752 | bdrv_attach_aio_context(bs->backing_hd, new_context); |
| 5753 | } |
| 5754 | if (bs->file) { |
| 5755 | bdrv_attach_aio_context(bs->file, new_context); |
| 5756 | } |
| 5757 | if (bs->drv->bdrv_attach_aio_context) { |
| 5758 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 5759 | } |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 5760 | if (bs->io_limits_enabled) { |
| 5761 | throttle_attach_aio_context(&bs->throttle_state, new_context); |
| 5762 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5763 | |
| 5764 | QLIST_FOREACH(ban, &bs->aio_notifiers, list) { |
| 5765 | ban->attached_aio_context(new_context, ban->opaque); |
| 5766 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5767 | } |
| 5768 | |
| 5769 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) |
| 5770 | { |
| 5771 | bdrv_drain_all(); /* ensure there are no in-flight requests */ |
| 5772 | |
| 5773 | bdrv_detach_aio_context(bs); |
| 5774 | |
| 5775 | /* This function executes in the old AioContext so acquire the new one in |
| 5776 | * case it runs in a different thread. |
| 5777 | */ |
| 5778 | aio_context_acquire(new_context); |
| 5779 | bdrv_attach_aio_context(bs, new_context); |
| 5780 | aio_context_release(new_context); |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 5781 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 5782 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5783 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 5784 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 5785 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 5786 | { |
| 5787 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 5788 | *ban = (BdrvAioNotifier){ |
| 5789 | .attached_aio_context = attached_aio_context, |
| 5790 | .detach_aio_context = detach_aio_context, |
| 5791 | .opaque = opaque |
| 5792 | }; |
| 5793 | |
| 5794 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 5795 | } |
| 5796 | |
| 5797 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 5798 | void (*attached_aio_context)(AioContext *, |
| 5799 | void *), |
| 5800 | void (*detach_aio_context)(void *), |
| 5801 | void *opaque) |
| 5802 | { |
| 5803 | BdrvAioNotifier *ban, *ban_next; |
| 5804 | |
| 5805 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 5806 | if (ban->attached_aio_context == attached_aio_context && |
| 5807 | ban->detach_aio_context == detach_aio_context && |
| 5808 | ban->opaque == opaque) |
| 5809 | { |
| 5810 | QLIST_REMOVE(ban, list); |
| 5811 | g_free(ban); |
| 5812 | |
| 5813 | return; |
| 5814 | } |
| 5815 | } |
| 5816 | |
| 5817 | abort(); |
| 5818 | } |
| 5819 | |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 5820 | void bdrv_add_before_write_notifier(BlockDriverState *bs, |
| 5821 | NotifierWithReturn *notifier) |
| 5822 | { |
| 5823 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); |
| 5824 | } |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5825 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5826 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5827 | { |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5828 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5829 | return -ENOTSUP; |
| 5830 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5831 | return bs->drv->bdrv_amend_options(bs, opts); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5832 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5833 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5834 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
| 5835 | * of block filter and by bdrv_is_first_non_filter. |
| 5836 | * It is used to test if the given bs is the candidate or recurse more in the |
| 5837 | * node graph. |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5838 | */ |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5839 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
| 5840 | BlockDriverState *candidate) |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5841 | { |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5842 | /* return false if basic checks fails */ |
| 5843 | if (!bs || !bs->drv) { |
| 5844 | return false; |
| 5845 | } |
| 5846 | |
| 5847 | /* the code reached a non block filter driver -> check if the bs is |
| 5848 | * the same as the candidate. It's the recursion termination condition. |
| 5849 | */ |
| 5850 | if (!bs->drv->is_filter) { |
| 5851 | return bs == candidate; |
| 5852 | } |
| 5853 | /* Down this path the driver is a block filter driver */ |
| 5854 | |
| 5855 | /* If the block filter recursion method is defined use it to recurse down |
| 5856 | * the node graph. |
| 5857 | */ |
| 5858 | if (bs->drv->bdrv_recurse_is_first_non_filter) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5859 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
| 5860 | } |
| 5861 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5862 | /* the driver is a block filter but don't allow to recurse -> return false |
| 5863 | */ |
| 5864 | return false; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5865 | } |
| 5866 | |
| 5867 | /* This function checks if the candidate is the first non filter bs down it's |
| 5868 | * bs chain. Since we don't have pointers to parents it explore all bs chains |
| 5869 | * from the top. Some filters can choose not to pass down the recursion. |
| 5870 | */ |
| 5871 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) |
| 5872 | { |
| 5873 | BlockDriverState *bs; |
| 5874 | |
| 5875 | /* walk down the bs forest recursively */ |
| 5876 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 5877 | bool perm; |
| 5878 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5879 | /* try to recurse in this top level bs */ |
Kevin Wolf | e6dc8a1 | 2014-02-04 11:45:31 +0100 | [diff] [blame] | 5880 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5881 | |
| 5882 | /* candidate is the first non filter */ |
| 5883 | if (perm) { |
| 5884 | return true; |
| 5885 | } |
| 5886 | } |
| 5887 | |
| 5888 | return false; |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5889 | } |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5890 | |
| 5891 | BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) |
| 5892 | { |
| 5893 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
| 5894 | if (!to_replace_bs) { |
| 5895 | error_setg(errp, "Node name '%s' not found", node_name); |
| 5896 | return NULL; |
| 5897 | } |
| 5898 | |
| 5899 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
| 5900 | return NULL; |
| 5901 | } |
| 5902 | |
| 5903 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 5904 | * most non filter in order to prevent data corruption. |
| 5905 | * Another benefit is that this tests exclude backing files which are |
| 5906 | * blocked by the backing blockers. |
| 5907 | */ |
| 5908 | if (!bdrv_is_first_non_filter(to_replace_bs)) { |
| 5909 | error_setg(errp, "Only top most non filter can be replaced"); |
| 5910 | return NULL; |
| 5911 | } |
| 5912 | |
| 5913 | return to_replace_bs; |
| 5914 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 5915 | |
| 5916 | void bdrv_io_plug(BlockDriverState *bs) |
| 5917 | { |
| 5918 | BlockDriver *drv = bs->drv; |
| 5919 | if (drv && drv->bdrv_io_plug) { |
| 5920 | drv->bdrv_io_plug(bs); |
| 5921 | } else if (bs->file) { |
| 5922 | bdrv_io_plug(bs->file); |
| 5923 | } |
| 5924 | } |
| 5925 | |
| 5926 | void bdrv_io_unplug(BlockDriverState *bs) |
| 5927 | { |
| 5928 | BlockDriver *drv = bs->drv; |
| 5929 | if (drv && drv->bdrv_io_unplug) { |
| 5930 | drv->bdrv_io_unplug(bs); |
| 5931 | } else if (bs->file) { |
| 5932 | bdrv_io_unplug(bs->file); |
| 5933 | } |
| 5934 | } |
| 5935 | |
| 5936 | void bdrv_flush_io_queue(BlockDriverState *bs) |
| 5937 | { |
| 5938 | BlockDriver *drv = bs->drv; |
| 5939 | if (drv && drv->bdrv_flush_io_queue) { |
| 5940 | drv->bdrv_flush_io_queue(bs); |
| 5941 | } else if (bs->file) { |
| 5942 | bdrv_flush_io_queue(bs->file); |
| 5943 | } |
| 5944 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5945 | |
| 5946 | static bool append_open_options(QDict *d, BlockDriverState *bs) |
| 5947 | { |
| 5948 | const QDictEntry *entry; |
| 5949 | bool found_any = false; |
| 5950 | |
| 5951 | for (entry = qdict_first(bs->options); entry; |
| 5952 | entry = qdict_next(bs->options, entry)) |
| 5953 | { |
| 5954 | /* Only take options for this level and exclude all non-driver-specific |
| 5955 | * options */ |
| 5956 | if (!strchr(qdict_entry_key(entry), '.') && |
| 5957 | strcmp(qdict_entry_key(entry), "node-name")) |
| 5958 | { |
| 5959 | qobject_incref(qdict_entry_value(entry)); |
| 5960 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); |
| 5961 | found_any = true; |
| 5962 | } |
| 5963 | } |
| 5964 | |
| 5965 | return found_any; |
| 5966 | } |
| 5967 | |
| 5968 | /* Updates the following BDS fields: |
| 5969 | * - exact_filename: A filename which may be used for opening a block device |
| 5970 | * which (mostly) equals the given BDS (even without any |
| 5971 | * other options; so reading and writing must return the same |
| 5972 | * results, but caching etc. may be different) |
| 5973 | * - full_open_options: Options which, when given when opening a block device |
| 5974 | * (without a filename), result in a BDS (mostly) |
| 5975 | * equalling the given one |
| 5976 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 5977 | * full_open_options is converted to a JSON object, prefixed with |
| 5978 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 5979 | */ |
| 5980 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 5981 | { |
| 5982 | BlockDriver *drv = bs->drv; |
| 5983 | QDict *opts; |
| 5984 | |
| 5985 | if (!drv) { |
| 5986 | return; |
| 5987 | } |
| 5988 | |
| 5989 | /* This BDS's file name will most probably depend on its file's name, so |
| 5990 | * refresh that first */ |
| 5991 | if (bs->file) { |
| 5992 | bdrv_refresh_filename(bs->file); |
| 5993 | } |
| 5994 | |
| 5995 | if (drv->bdrv_refresh_filename) { |
| 5996 | /* Obsolete information is of no use here, so drop the old file name |
| 5997 | * information before refreshing it */ |
| 5998 | bs->exact_filename[0] = '\0'; |
| 5999 | if (bs->full_open_options) { |
| 6000 | QDECREF(bs->full_open_options); |
| 6001 | bs->full_open_options = NULL; |
| 6002 | } |
| 6003 | |
| 6004 | drv->bdrv_refresh_filename(bs); |
| 6005 | } else if (bs->file) { |
| 6006 | /* Try to reconstruct valid information from the underlying file */ |
| 6007 | bool has_open_options; |
| 6008 | |
| 6009 | bs->exact_filename[0] = '\0'; |
| 6010 | if (bs->full_open_options) { |
| 6011 | QDECREF(bs->full_open_options); |
| 6012 | bs->full_open_options = NULL; |
| 6013 | } |
| 6014 | |
| 6015 | opts = qdict_new(); |
| 6016 | has_open_options = append_open_options(opts, bs); |
| 6017 | |
| 6018 | /* If no specific options have been given for this BDS, the filename of |
| 6019 | * the underlying file should suffice for this one as well */ |
| 6020 | if (bs->file->exact_filename[0] && !has_open_options) { |
| 6021 | strcpy(bs->exact_filename, bs->file->exact_filename); |
| 6022 | } |
| 6023 | /* Reconstructing the full options QDict is simple for most format block |
| 6024 | * drivers, as long as the full options are known for the underlying |
| 6025 | * file BDS. The full options QDict of that file BDS should somehow |
| 6026 | * contain a representation of the filename, therefore the following |
| 6027 | * suffices without querying the (exact_)filename of this BDS. */ |
| 6028 | if (bs->file->full_open_options) { |
| 6029 | qdict_put_obj(opts, "driver", |
| 6030 | QOBJECT(qstring_from_str(drv->format_name))); |
| 6031 | QINCREF(bs->file->full_open_options); |
| 6032 | qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options)); |
| 6033 | |
| 6034 | bs->full_open_options = opts; |
| 6035 | } else { |
| 6036 | QDECREF(opts); |
| 6037 | } |
| 6038 | } else if (!bs->full_open_options && qdict_size(bs->options)) { |
| 6039 | /* There is no underlying file BDS (at least referenced by BDS.file), |
| 6040 | * so the full options QDict should be equal to the options given |
| 6041 | * specifically for this block device when it was opened (plus the |
| 6042 | * driver specification). |
| 6043 | * Because those options don't change, there is no need to update |
| 6044 | * full_open_options when it's already set. */ |
| 6045 | |
| 6046 | opts = qdict_new(); |
| 6047 | append_open_options(opts, bs); |
| 6048 | qdict_put_obj(opts, "driver", |
| 6049 | QOBJECT(qstring_from_str(drv->format_name))); |
| 6050 | |
| 6051 | if (bs->exact_filename[0]) { |
| 6052 | /* This may not work for all block protocol drivers (some may |
| 6053 | * require this filename to be parsed), but we have to find some |
| 6054 | * default solution here, so just include it. If some block driver |
| 6055 | * does not support pure options without any filename at all or |
| 6056 | * needs some special format of the options QDict, it needs to |
| 6057 | * implement the driver-specific bdrv_refresh_filename() function. |
| 6058 | */ |
| 6059 | qdict_put_obj(opts, "filename", |
| 6060 | QOBJECT(qstring_from_str(bs->exact_filename))); |
| 6061 | } |
| 6062 | |
| 6063 | bs->full_open_options = opts; |
| 6064 | } |
| 6065 | |
| 6066 | if (bs->exact_filename[0]) { |
| 6067 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
| 6068 | } else if (bs->full_open_options) { |
| 6069 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
| 6070 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
| 6071 | qstring_get_str(json)); |
| 6072 | QDECREF(json); |
| 6073 | } |
| 6074 | } |
Benoît Canet | 5366d0c | 2014-09-05 15:46:18 +0200 | [diff] [blame] | 6075 | |
| 6076 | /* This accessor function purpose is to allow the device models to access the |
| 6077 | * BlockAcctStats structure embedded inside a BlockDriverState without being |
| 6078 | * aware of the BlockDriverState structure layout. |
| 6079 | * It will go away when the BlockAcctStats structure will be moved inside |
| 6080 | * the device models. |
| 6081 | */ |
| 6082 | BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) |
| 6083 | { |
| 6084 | return &bs->stats; |
| 6085 | } |