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bellardfc01f7e2003-06-30 10:03:06 +00001/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
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 */
bellardfc01f7e2003-06-30 10:03:06 +000024#include "vl.h"
bellardea2384d2004-08-01 21:59:26 +000025#include "block_int.h"
bellardfc01f7e2003-06-30 10:03:06 +000026
bellard7674e7b2005-04-26 21:59:26 +000027#ifdef _BSD
28#include <sys/types.h>
29#include <sys/stat.h>
30#include <sys/ioctl.h>
31#include <sys/queue.h>
32#include <sys/disk.h>
33#endif
34
bellard83f64092006-08-01 16:21:11 +000035#define SECTOR_BITS 9
36#define SECTOR_SIZE (1 << SECTOR_BITS)
bellard3b0d4f62005-10-30 18:30:10 +000037
bellard90765422006-08-07 19:10:16 +000038typedef struct BlockDriverAIOCBSync {
39 BlockDriverAIOCB common;
40 QEMUBH *bh;
41 int ret;
42} BlockDriverAIOCBSync;
43
pbrookce1a14d2006-08-07 02:38:06 +000044static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
45 int64_t sector_num, uint8_t *buf, int nb_sectors,
46 BlockDriverCompletionFunc *cb, void *opaque);
47static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
48 int64_t sector_num, const uint8_t *buf, int nb_sectors,
49 BlockDriverCompletionFunc *cb, void *opaque);
bellard83f64092006-08-01 16:21:11 +000050static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
bellard83f64092006-08-01 16:21:11 +000051static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
52 uint8_t *buf, int nb_sectors);
53static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
54 const uint8_t *buf, int nb_sectors);
bellardec530c82006-04-25 22:36:06 +000055
bellardb3380822004-03-14 21:38:54 +000056static BlockDriverState *bdrv_first;
bellardea2384d2004-08-01 21:59:26 +000057static BlockDriver *first_drv;
58
bellard83f64092006-08-01 16:21:11 +000059#ifdef _WIN32
60#define PATH_SEP '\\'
61#else
62#define PATH_SEP '/'
bellard3b0d4f62005-10-30 18:30:10 +000063#endif
64
bellard83f64092006-08-01 16:21:11 +000065int path_is_absolute(const char *path)
66{
67 const char *p;
68 p = strchr(path, ':');
69 if (p)
70 p++;
71 else
72 p = path;
73 return (*p == PATH_SEP);
74}
75
76/* if filename is absolute, just copy it to dest. Otherwise, build a
77 path to it by considering it is relative to base_path. URL are
78 supported. */
79void path_combine(char *dest, int dest_size,
80 const char *base_path,
81 const char *filename)
82{
83 const char *p, *p1;
84 int len;
85
86 if (dest_size <= 0)
87 return;
88 if (path_is_absolute(filename)) {
89 pstrcpy(dest, dest_size, filename);
90 } else {
91 p = strchr(base_path, ':');
92 if (p)
93 p++;
94 else
95 p = base_path;
96 p1 = strrchr(base_path, PATH_SEP);
97 if (p1)
98 p1++;
99 else
100 p1 = base_path;
101 if (p1 > p)
102 p = p1;
103 len = p - base_path;
104 if (len > dest_size - 1)
105 len = dest_size - 1;
106 memcpy(dest, base_path, len);
107 dest[len] = '\0';
108 pstrcat(dest, dest_size, filename);
109 }
110}
111
112
bellardea2384d2004-08-01 21:59:26 +0000113void bdrv_register(BlockDriver *bdrv)
114{
pbrookce1a14d2006-08-07 02:38:06 +0000115 if (!bdrv->bdrv_aio_read) {
bellard83f64092006-08-01 16:21:11 +0000116 /* add AIO emulation layer */
bellard83f64092006-08-01 16:21:11 +0000117 bdrv->bdrv_aio_read = bdrv_aio_read_em;
118 bdrv->bdrv_aio_write = bdrv_aio_write_em;
119 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
bellard90765422006-08-07 19:10:16 +0000120 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
bellard83f64092006-08-01 16:21:11 +0000121 } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
122 /* add synchronous IO emulation layer */
123 bdrv->bdrv_read = bdrv_read_em;
124 bdrv->bdrv_write = bdrv_write_em;
125 }
bellardea2384d2004-08-01 21:59:26 +0000126 bdrv->next = first_drv;
127 first_drv = bdrv;
128}
bellardb3380822004-03-14 21:38:54 +0000129
130/* create a new block device (by default it is empty) */
131BlockDriverState *bdrv_new(const char *device_name)
bellardfc01f7e2003-06-30 10:03:06 +0000132{
bellardb3380822004-03-14 21:38:54 +0000133 BlockDriverState **pbs, *bs;
134
135 bs = qemu_mallocz(sizeof(BlockDriverState));
136 if(!bs)
137 return NULL;
138 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
bellardea2384d2004-08-01 21:59:26 +0000139 if (device_name[0] != '\0') {
140 /* insert at the end */
141 pbs = &bdrv_first;
142 while (*pbs != NULL)
143 pbs = &(*pbs)->next;
144 *pbs = bs;
145 }
bellardb3380822004-03-14 21:38:54 +0000146 return bs;
147}
148
bellardea2384d2004-08-01 21:59:26 +0000149BlockDriver *bdrv_find_format(const char *format_name)
150{
151 BlockDriver *drv1;
152 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
153 if (!strcmp(drv1->format_name, format_name))
154 return drv1;
155 }
156 return NULL;
157}
158
159int bdrv_create(BlockDriver *drv,
160 const char *filename, int64_t size_in_sectors,
161 const char *backing_file, int flags)
162{
163 if (!drv->bdrv_create)
164 return -ENOTSUP;
165 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
166}
167
bellardd5249392004-08-03 21:14:23 +0000168#ifdef _WIN32
bellard95389c82005-12-18 18:28:15 +0000169void get_tmp_filename(char *filename, int size)
bellardd5249392004-08-03 21:14:23 +0000170{
bellard83f64092006-08-01 16:21:11 +0000171 tmpnam(filename);
bellardd5249392004-08-03 21:14:23 +0000172}
173#else
bellard95389c82005-12-18 18:28:15 +0000174void get_tmp_filename(char *filename, int size)
bellardea2384d2004-08-01 21:59:26 +0000175{
176 int fd;
bellardd5249392004-08-03 21:14:23 +0000177 /* XXX: race condition possible */
bellardea2384d2004-08-01 21:59:26 +0000178 pstrcpy(filename, size, "/tmp/vl.XXXXXX");
179 fd = mkstemp(filename);
180 close(fd);
181}
bellardd5249392004-08-03 21:14:23 +0000182#endif
bellardea2384d2004-08-01 21:59:26 +0000183
bellard19cb3732006-08-19 11:45:59 +0000184#ifdef _WIN32
bellardf45512f2006-08-23 21:40:13 +0000185static int is_windows_drive_prefix(const char *filename)
186{
187 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
188 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
189 filename[1] == ':');
190}
191
bellard19cb3732006-08-19 11:45:59 +0000192static int is_windows_drive(const char *filename)
193{
bellardf45512f2006-08-23 21:40:13 +0000194 if (is_windows_drive_prefix(filename) &&
195 filename[2] == '\0')
bellard19cb3732006-08-19 11:45:59 +0000196 return 1;
197 if (strstart(filename, "\\\\.\\", NULL) ||
198 strstart(filename, "//./", NULL))
199 return 1;
200 return 0;
201}
202#endif
203
bellard83f64092006-08-01 16:21:11 +0000204static BlockDriver *find_protocol(const char *filename)
205{
206 BlockDriver *drv1;
207 char protocol[128];
208 int len;
209 const char *p;
bellard19cb3732006-08-19 11:45:59 +0000210
211#ifdef _WIN32
bellardf45512f2006-08-23 21:40:13 +0000212 if (is_windows_drive(filename) ||
213 is_windows_drive_prefix(filename))
bellard19cb3732006-08-19 11:45:59 +0000214 return &bdrv_raw;
215#endif
bellard83f64092006-08-01 16:21:11 +0000216 p = strchr(filename, ':');
217 if (!p)
218 return &bdrv_raw;
219 len = p - filename;
220 if (len > sizeof(protocol) - 1)
221 len = sizeof(protocol) - 1;
bellard83f64092006-08-01 16:21:11 +0000222 memcpy(protocol, filename, len);
223 protocol[len] = '\0';
224 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
225 if (drv1->protocol_name &&
226 !strcmp(drv1->protocol_name, protocol))
227 return drv1;
228 }
229 return NULL;
230}
231
bellard7674e7b2005-04-26 21:59:26 +0000232/* XXX: force raw format if block or character device ? It would
233 simplify the BSD case */
bellardea2384d2004-08-01 21:59:26 +0000234static BlockDriver *find_image_format(const char *filename)
235{
bellard83f64092006-08-01 16:21:11 +0000236 int ret, score, score_max;
bellardea2384d2004-08-01 21:59:26 +0000237 BlockDriver *drv1, *drv;
bellard83f64092006-08-01 16:21:11 +0000238 uint8_t buf[2048];
239 BlockDriverState *bs;
bellardea2384d2004-08-01 21:59:26 +0000240
bellard19cb3732006-08-19 11:45:59 +0000241 /* detect host devices. By convention, /dev/cdrom[N] is always
242 recognized as a host CDROM */
243 if (strstart(filename, "/dev/cdrom", NULL))
244 return &bdrv_host_device;
245#ifdef _WIN32
246 if (is_windows_drive(filename))
247 return &bdrv_host_device;
248#else
249 {
250 struct stat st;
251 if (stat(filename, &st) >= 0 &&
252 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
253 return &bdrv_host_device;
254 }
255 }
256#endif
257
bellard83f64092006-08-01 16:21:11 +0000258 drv = find_protocol(filename);
bellard19cb3732006-08-19 11:45:59 +0000259 /* no need to test disk image formats for vvfat */
bellard83f64092006-08-01 16:21:11 +0000260 if (drv == &bdrv_vvfat)
261 return drv;
bellard19cb3732006-08-19 11:45:59 +0000262
bellard83f64092006-08-01 16:21:11 +0000263 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
264 if (ret < 0)
265 return NULL;
266 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
267 bdrv_delete(bs);
268 if (ret < 0) {
269 return NULL;
270 }
271
bellardea2384d2004-08-01 21:59:26 +0000272 score_max = 0;
273 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
bellard83f64092006-08-01 16:21:11 +0000274 if (drv1->bdrv_probe) {
275 score = drv1->bdrv_probe(buf, ret, filename);
276 if (score > score_max) {
277 score_max = score;
278 drv = drv1;
279 }
bellardea2384d2004-08-01 21:59:26 +0000280 }
281 }
282 return drv;
283}
284
bellard83f64092006-08-01 16:21:11 +0000285int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
bellardb3380822004-03-14 21:38:54 +0000286{
bellard83f64092006-08-01 16:21:11 +0000287 BlockDriverState *bs;
288 int ret;
289
290 bs = bdrv_new("");
291 if (!bs)
292 return -ENOMEM;
293 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
294 if (ret < 0) {
295 bdrv_delete(bs);
296 return ret;
bellard3b0d4f62005-10-30 18:30:10 +0000297 }
bellard83f64092006-08-01 16:21:11 +0000298 *pbs = bs;
299 return 0;
bellardea2384d2004-08-01 21:59:26 +0000300}
bellardfc01f7e2003-06-30 10:03:06 +0000301
bellard83f64092006-08-01 16:21:11 +0000302int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
303{
304 return bdrv_open2(bs, filename, flags, NULL);
305}
306
307int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
bellardea2384d2004-08-01 21:59:26 +0000308 BlockDriver *drv)
309{
bellard83f64092006-08-01 16:21:11 +0000310 int ret, open_flags;
bellardea2384d2004-08-01 21:59:26 +0000311 char tmp_filename[1024];
bellard83f64092006-08-01 16:21:11 +0000312 char backing_filename[1024];
bellard33e39632003-07-06 17:15:21 +0000313
bellardea2384d2004-08-01 21:59:26 +0000314 bs->read_only = 0;
315 bs->is_temporary = 0;
316 bs->encrypted = 0;
bellard712e7872005-04-28 21:09:32 +0000317
bellard83f64092006-08-01 16:21:11 +0000318 if (flags & BDRV_O_SNAPSHOT) {
bellardea2384d2004-08-01 21:59:26 +0000319 BlockDriverState *bs1;
320 int64_t total_size;
321
322 /* if snapshot, we create a temporary backing file and open it
323 instead of opening 'filename' directly */
324
325 /* if there is a backing file, use it */
326 bs1 = bdrv_new("");
327 if (!bs1) {
bellard83f64092006-08-01 16:21:11 +0000328 return -ENOMEM;
bellardea2384d2004-08-01 21:59:26 +0000329 }
330 if (bdrv_open(bs1, filename, 0) < 0) {
331 bdrv_delete(bs1);
332 return -1;
333 }
bellard83f64092006-08-01 16:21:11 +0000334 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
bellardea2384d2004-08-01 21:59:26 +0000335 bdrv_delete(bs1);
336
337 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
bellarda817d932006-08-24 19:53:37 +0000338 realpath(filename, backing_filename);
bellardd15a7712006-08-06 13:35:09 +0000339 if (bdrv_create(&bdrv_qcow2, tmp_filename,
bellarda817d932006-08-24 19:53:37 +0000340 total_size, backing_filename, 0) < 0) {
bellardea2384d2004-08-01 21:59:26 +0000341 return -1;
342 }
343 filename = tmp_filename;
344 bs->is_temporary = 1;
345 }
bellard712e7872005-04-28 21:09:32 +0000346
bellardea2384d2004-08-01 21:59:26 +0000347 pstrcpy(bs->filename, sizeof(bs->filename), filename);
bellard83f64092006-08-01 16:21:11 +0000348 if (flags & BDRV_O_FILE) {
349 drv = find_protocol(filename);
bellardea2384d2004-08-01 21:59:26 +0000350 if (!drv)
bellard83f64092006-08-01 16:21:11 +0000351 return -ENOENT;
352 } else {
353 if (!drv) {
354 drv = find_image_format(filename);
355 if (!drv)
356 return -1;
357 }
bellardea2384d2004-08-01 21:59:26 +0000358 }
359 bs->drv = drv;
360 bs->opaque = qemu_mallocz(drv->instance_size);
361 if (bs->opaque == NULL && drv->instance_size > 0)
362 return -1;
bellard83f64092006-08-01 16:21:11 +0000363 /* Note: for compatibility, we open disk image files as RDWR, and
364 RDONLY as fallback */
365 if (!(flags & BDRV_O_FILE))
366 open_flags = BDRV_O_RDWR;
367 else
368 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
369 ret = drv->bdrv_open(bs, filename, open_flags);
370 if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
371 ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
372 bs->read_only = 1;
373 }
bellardea2384d2004-08-01 21:59:26 +0000374 if (ret < 0) {
375 qemu_free(bs->opaque);
bellard6b21b972006-08-23 21:14:37 +0000376 bs->opaque = NULL;
377 bs->drv = NULL;
bellard83f64092006-08-01 16:21:11 +0000378 return ret;
bellardea2384d2004-08-01 21:59:26 +0000379 }
bellardd15a7712006-08-06 13:35:09 +0000380 if (drv->bdrv_getlength) {
381 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
382 }
bellardea2384d2004-08-01 21:59:26 +0000383#ifndef _WIN32
384 if (bs->is_temporary) {
385 unlink(filename);
386 }
387#endif
bellard83f64092006-08-01 16:21:11 +0000388 if (bs->backing_file[0] != '\0') {
bellardea2384d2004-08-01 21:59:26 +0000389 /* if there is a backing file, use it */
390 bs->backing_hd = bdrv_new("");
391 if (!bs->backing_hd) {
392 fail:
393 bdrv_close(bs);
bellard6b21b972006-08-23 21:14:37 +0000394 return -ENOMEM;
bellardea2384d2004-08-01 21:59:26 +0000395 }
bellard83f64092006-08-01 16:21:11 +0000396 path_combine(backing_filename, sizeof(backing_filename),
397 filename, bs->backing_file);
398 if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
bellardea2384d2004-08-01 21:59:26 +0000399 goto fail;
400 }
401
bellardb3380822004-03-14 21:38:54 +0000402 /* call the change callback */
bellard19cb3732006-08-19 11:45:59 +0000403 bs->media_changed = 1;
bellardb3380822004-03-14 21:38:54 +0000404 if (bs->change_cb)
405 bs->change_cb(bs->change_opaque);
406
407 return 0;
bellardfc01f7e2003-06-30 10:03:06 +0000408}
409
410void bdrv_close(BlockDriverState *bs)
411{
bellard19cb3732006-08-19 11:45:59 +0000412 if (bs->drv) {
bellardea2384d2004-08-01 21:59:26 +0000413 if (bs->backing_hd)
414 bdrv_delete(bs->backing_hd);
415 bs->drv->bdrv_close(bs);
416 qemu_free(bs->opaque);
417#ifdef _WIN32
418 if (bs->is_temporary) {
419 unlink(bs->filename);
420 }
bellard67b915a2004-03-31 23:37:16 +0000421#endif
bellardea2384d2004-08-01 21:59:26 +0000422 bs->opaque = NULL;
423 bs->drv = NULL;
bellardb3380822004-03-14 21:38:54 +0000424
425 /* call the change callback */
bellard19cb3732006-08-19 11:45:59 +0000426 bs->media_changed = 1;
bellardb3380822004-03-14 21:38:54 +0000427 if (bs->change_cb)
428 bs->change_cb(bs->change_opaque);
429 }
430}
431
432void bdrv_delete(BlockDriverState *bs)
433{
bellardea2384d2004-08-01 21:59:26 +0000434 /* XXX: remove the driver list */
bellardb3380822004-03-14 21:38:54 +0000435 bdrv_close(bs);
436 qemu_free(bs);
bellardfc01f7e2003-06-30 10:03:06 +0000437}
438
bellard33e39632003-07-06 17:15:21 +0000439/* commit COW file into the raw image */
440int bdrv_commit(BlockDriverState *bs)
441{
bellard19cb3732006-08-19 11:45:59 +0000442 BlockDriver *drv = bs->drv;
bellard83f64092006-08-01 16:21:11 +0000443 int64_t i, total_sectors;
bellardea2384d2004-08-01 21:59:26 +0000444 int n, j;
445 unsigned char sector[512];
bellard33e39632003-07-06 17:15:21 +0000446
bellard19cb3732006-08-19 11:45:59 +0000447 if (!drv)
448 return -ENOMEDIUM;
bellard33e39632003-07-06 17:15:21 +0000449
450 if (bs->read_only) {
bellardea2384d2004-08-01 21:59:26 +0000451 return -EACCES;
bellard33e39632003-07-06 17:15:21 +0000452 }
453
bellardea2384d2004-08-01 21:59:26 +0000454 if (!bs->backing_hd) {
455 return -ENOTSUP;
bellard33e39632003-07-06 17:15:21 +0000456 }
bellardea2384d2004-08-01 21:59:26 +0000457
bellard83f64092006-08-01 16:21:11 +0000458 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
459 for (i = 0; i < total_sectors;) {
bellard19cb3732006-08-19 11:45:59 +0000460 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
bellardea2384d2004-08-01 21:59:26 +0000461 for(j = 0; j < n; j++) {
462 if (bdrv_read(bs, i, sector, 1) != 0) {
463 return -EIO;
464 }
465
466 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
467 return -EIO;
468 }
469 i++;
470 }
471 } else {
472 i += n;
473 }
474 }
bellard95389c82005-12-18 18:28:15 +0000475
bellard19cb3732006-08-19 11:45:59 +0000476 if (drv->bdrv_make_empty)
477 return drv->bdrv_make_empty(bs);
bellard95389c82005-12-18 18:28:15 +0000478
bellard33e39632003-07-06 17:15:21 +0000479 return 0;
480}
481
bellard19cb3732006-08-19 11:45:59 +0000482/* return < 0 if error. See bdrv_write() for the return codes */
bellardfc01f7e2003-06-30 10:03:06 +0000483int bdrv_read(BlockDriverState *bs, int64_t sector_num,
484 uint8_t *buf, int nb_sectors)
485{
bellardea2384d2004-08-01 21:59:26 +0000486 BlockDriver *drv = bs->drv;
487
bellard19cb3732006-08-19 11:45:59 +0000488 if (!drv)
489 return -ENOMEDIUM;
bellardb3380822004-03-14 21:38:54 +0000490
bellard83f64092006-08-01 16:21:11 +0000491 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
bellardcf989512004-02-16 21:56:36 +0000492 memcpy(buf, bs->boot_sector_data, 512);
bellard83f64092006-08-01 16:21:11 +0000493 sector_num++;
494 nb_sectors--;
495 buf += 512;
496 if (nb_sectors == 0)
497 return 0;
bellard33e39632003-07-06 17:15:21 +0000498 }
bellard83f64092006-08-01 16:21:11 +0000499 if (drv->bdrv_pread) {
500 int ret, len;
501 len = nb_sectors * 512;
502 ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
503 if (ret < 0)
504 return ret;
505 else if (ret != len)
bellard19cb3732006-08-19 11:45:59 +0000506 return -EINVAL;
bellard83f64092006-08-01 16:21:11 +0000507 else
508 return 0;
509 } else {
510 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
511 }
bellardfc01f7e2003-06-30 10:03:06 +0000512}
513
bellard19cb3732006-08-19 11:45:59 +0000514/* Return < 0 if error. Important errors are:
515 -EIO generic I/O error (may happen for all errors)
516 -ENOMEDIUM No media inserted.
517 -EINVAL Invalid sector number or nb_sectors
518 -EACCES Trying to write a read-only device
519*/
bellardfc01f7e2003-06-30 10:03:06 +0000520int bdrv_write(BlockDriverState *bs, int64_t sector_num,
521 const uint8_t *buf, int nb_sectors)
522{
bellard83f64092006-08-01 16:21:11 +0000523 BlockDriver *drv = bs->drv;
bellard19cb3732006-08-19 11:45:59 +0000524 if (!bs->drv)
525 return -ENOMEDIUM;
bellard0849bf02003-06-30 23:17:31 +0000526 if (bs->read_only)
bellard19cb3732006-08-19 11:45:59 +0000527 return -EACCES;
bellard79639d42005-11-26 10:58:41 +0000528 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
529 memcpy(bs->boot_sector_data, buf, 512);
530 }
bellard83f64092006-08-01 16:21:11 +0000531 if (drv->bdrv_pwrite) {
532 int ret, len;
533 len = nb_sectors * 512;
534 ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
535 if (ret < 0)
536 return ret;
537 else if (ret != len)
538 return -EIO;
539 else
540 return 0;
541 } else {
542 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
543 }
544}
545
bellard83f64092006-08-01 16:21:11 +0000546static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
bellardfaea38e2006-08-05 21:31:00 +0000547 uint8_t *buf, int count1)
bellard83f64092006-08-01 16:21:11 +0000548{
bellard83f64092006-08-01 16:21:11 +0000549 uint8_t tmp_buf[SECTOR_SIZE];
550 int len, nb_sectors, count;
551 int64_t sector_num;
552
553 count = count1;
554 /* first read to align to sector start */
555 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
556 if (len > count)
557 len = count;
558 sector_num = offset >> SECTOR_BITS;
559 if (len > 0) {
560 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
561 return -EIO;
562 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
563 count -= len;
564 if (count == 0)
565 return count1;
566 sector_num++;
567 buf += len;
568 }
569
570 /* read the sectors "in place" */
571 nb_sectors = count >> SECTOR_BITS;
572 if (nb_sectors > 0) {
573 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
574 return -EIO;
575 sector_num += nb_sectors;
576 len = nb_sectors << SECTOR_BITS;
577 buf += len;
578 count -= len;
579 }
580
581 /* add data from the last sector */
582 if (count > 0) {
583 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
584 return -EIO;
585 memcpy(buf, tmp_buf, count);
586 }
587 return count1;
588}
589
590static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
bellardfaea38e2006-08-05 21:31:00 +0000591 const uint8_t *buf, int count1)
bellard83f64092006-08-01 16:21:11 +0000592{
bellard83f64092006-08-01 16:21:11 +0000593 uint8_t tmp_buf[SECTOR_SIZE];
594 int len, nb_sectors, count;
595 int64_t sector_num;
596
597 count = count1;
598 /* first write to align to sector start */
599 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
600 if (len > count)
601 len = count;
602 sector_num = offset >> SECTOR_BITS;
603 if (len > 0) {
604 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
605 return -EIO;
606 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
607 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
608 return -EIO;
609 count -= len;
610 if (count == 0)
611 return count1;
612 sector_num++;
613 buf += len;
614 }
615
616 /* write the sectors "in place" */
617 nb_sectors = count >> SECTOR_BITS;
618 if (nb_sectors > 0) {
619 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
620 return -EIO;
621 sector_num += nb_sectors;
622 len = nb_sectors << SECTOR_BITS;
623 buf += len;
624 count -= len;
625 }
626
627 /* add data from the last sector */
628 if (count > 0) {
629 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
630 return -EIO;
631 memcpy(tmp_buf, buf, count);
632 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
633 return -EIO;
634 }
635 return count1;
636}
bellard83f64092006-08-01 16:21:11 +0000637
638/**
639 * Read with byte offsets (needed only for file protocols)
640 */
641int bdrv_pread(BlockDriverState *bs, int64_t offset,
642 void *buf1, int count1)
643{
644 BlockDriver *drv = bs->drv;
645
646 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000647 return -ENOMEDIUM;
bellard83f64092006-08-01 16:21:11 +0000648 if (!drv->bdrv_pread)
bellardfaea38e2006-08-05 21:31:00 +0000649 return bdrv_pread_em(bs, offset, buf1, count1);
bellard83f64092006-08-01 16:21:11 +0000650 return drv->bdrv_pread(bs, offset, buf1, count1);
651}
652
653/**
654 * Write with byte offsets (needed only for file protocols)
655 */
656int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
657 const void *buf1, int count1)
658{
659 BlockDriver *drv = bs->drv;
660
661 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000662 return -ENOMEDIUM;
bellard83f64092006-08-01 16:21:11 +0000663 if (!drv->bdrv_pwrite)
bellardfaea38e2006-08-05 21:31:00 +0000664 return bdrv_pwrite_em(bs, offset, buf1, count1);
bellard83f64092006-08-01 16:21:11 +0000665 return drv->bdrv_pwrite(bs, offset, buf1, count1);
666}
667
668/**
669 * Truncate file to 'offset' bytes (needed only for file protocols)
670 */
671int bdrv_truncate(BlockDriverState *bs, int64_t offset)
672{
673 BlockDriver *drv = bs->drv;
674 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000675 return -ENOMEDIUM;
bellard83f64092006-08-01 16:21:11 +0000676 if (!drv->bdrv_truncate)
677 return -ENOTSUP;
678 return drv->bdrv_truncate(bs, offset);
679}
680
681/**
682 * Length of a file in bytes. Return < 0 if error or unknown.
683 */
684int64_t bdrv_getlength(BlockDriverState *bs)
685{
686 BlockDriver *drv = bs->drv;
687 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000688 return -ENOMEDIUM;
bellard83f64092006-08-01 16:21:11 +0000689 if (!drv->bdrv_getlength) {
690 /* legacy mode */
691 return bs->total_sectors * SECTOR_SIZE;
692 }
693 return drv->bdrv_getlength(bs);
bellardfc01f7e2003-06-30 10:03:06 +0000694}
695
bellard19cb3732006-08-19 11:45:59 +0000696/* return 0 as number of sectors if no device present or error */
bellardfc01f7e2003-06-30 10:03:06 +0000697void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
698{
bellard19cb3732006-08-19 11:45:59 +0000699 int64_t length;
700 length = bdrv_getlength(bs);
701 if (length < 0)
702 length = 0;
703 else
704 length = length >> SECTOR_BITS;
705 *nb_sectors_ptr = length;
bellardfc01f7e2003-06-30 10:03:06 +0000706}
bellardcf989512004-02-16 21:56:36 +0000707
708/* force a given boot sector. */
709void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
710{
711 bs->boot_sector_enabled = 1;
712 if (size > 512)
713 size = 512;
714 memcpy(bs->boot_sector_data, data, size);
715 memset(bs->boot_sector_data + size, 0, 512 - size);
716}
bellardb3380822004-03-14 21:38:54 +0000717
718void bdrv_set_geometry_hint(BlockDriverState *bs,
719 int cyls, int heads, int secs)
720{
721 bs->cyls = cyls;
722 bs->heads = heads;
723 bs->secs = secs;
724}
725
726void bdrv_set_type_hint(BlockDriverState *bs, int type)
727{
728 bs->type = type;
729 bs->removable = ((type == BDRV_TYPE_CDROM ||
730 type == BDRV_TYPE_FLOPPY));
731}
732
bellard46d47672004-11-16 01:45:27 +0000733void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
734{
735 bs->translation = translation;
736}
737
bellardb3380822004-03-14 21:38:54 +0000738void bdrv_get_geometry_hint(BlockDriverState *bs,
739 int *pcyls, int *pheads, int *psecs)
740{
741 *pcyls = bs->cyls;
742 *pheads = bs->heads;
743 *psecs = bs->secs;
744}
745
746int bdrv_get_type_hint(BlockDriverState *bs)
747{
748 return bs->type;
749}
750
bellard46d47672004-11-16 01:45:27 +0000751int bdrv_get_translation_hint(BlockDriverState *bs)
752{
753 return bs->translation;
754}
755
bellardb3380822004-03-14 21:38:54 +0000756int bdrv_is_removable(BlockDriverState *bs)
757{
758 return bs->removable;
759}
760
761int bdrv_is_read_only(BlockDriverState *bs)
762{
763 return bs->read_only;
764}
765
bellard19cb3732006-08-19 11:45:59 +0000766/* XXX: no longer used */
bellardb3380822004-03-14 21:38:54 +0000767void bdrv_set_change_cb(BlockDriverState *bs,
768 void (*change_cb)(void *opaque), void *opaque)
769{
770 bs->change_cb = change_cb;
771 bs->change_opaque = opaque;
772}
773
bellardea2384d2004-08-01 21:59:26 +0000774int bdrv_is_encrypted(BlockDriverState *bs)
775{
776 if (bs->backing_hd && bs->backing_hd->encrypted)
777 return 1;
778 return bs->encrypted;
779}
780
781int bdrv_set_key(BlockDriverState *bs, const char *key)
782{
783 int ret;
784 if (bs->backing_hd && bs->backing_hd->encrypted) {
785 ret = bdrv_set_key(bs->backing_hd, key);
786 if (ret < 0)
787 return ret;
788 if (!bs->encrypted)
789 return 0;
790 }
791 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
792 return -1;
793 return bs->drv->bdrv_set_key(bs, key);
794}
795
796void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
797{
bellard19cb3732006-08-19 11:45:59 +0000798 if (!bs->drv) {
bellardea2384d2004-08-01 21:59:26 +0000799 buf[0] = '\0';
800 } else {
801 pstrcpy(buf, buf_size, bs->drv->format_name);
802 }
803}
804
805void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
806 void *opaque)
807{
808 BlockDriver *drv;
809
810 for (drv = first_drv; drv != NULL; drv = drv->next) {
811 it(opaque, drv->format_name);
812 }
813}
814
bellardb3380822004-03-14 21:38:54 +0000815BlockDriverState *bdrv_find(const char *name)
816{
817 BlockDriverState *bs;
818
819 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
820 if (!strcmp(name, bs->device_name))
821 return bs;
822 }
823 return NULL;
824}
825
bellard81d09122004-07-14 17:21:37 +0000826void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
827{
828 BlockDriverState *bs;
829
830 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
831 it(opaque, bs->device_name);
832 }
833}
834
bellardea2384d2004-08-01 21:59:26 +0000835const char *bdrv_get_device_name(BlockDriverState *bs)
836{
837 return bs->device_name;
838}
839
pbrook7a6cba62006-06-04 11:39:07 +0000840void bdrv_flush(BlockDriverState *bs)
841{
842 if (bs->drv->bdrv_flush)
843 bs->drv->bdrv_flush(bs);
844 if (bs->backing_hd)
845 bdrv_flush(bs->backing_hd);
846}
847
bellardb3380822004-03-14 21:38:54 +0000848void bdrv_info(void)
849{
850 BlockDriverState *bs;
851
852 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
853 term_printf("%s:", bs->device_name);
854 term_printf(" type=");
855 switch(bs->type) {
856 case BDRV_TYPE_HD:
857 term_printf("hd");
858 break;
859 case BDRV_TYPE_CDROM:
860 term_printf("cdrom");
861 break;
862 case BDRV_TYPE_FLOPPY:
863 term_printf("floppy");
864 break;
865 }
866 term_printf(" removable=%d", bs->removable);
867 if (bs->removable) {
868 term_printf(" locked=%d", bs->locked);
869 }
bellard19cb3732006-08-19 11:45:59 +0000870 if (bs->drv) {
bellardb3380822004-03-14 21:38:54 +0000871 term_printf(" file=%s", bs->filename);
bellardea2384d2004-08-01 21:59:26 +0000872 if (bs->backing_file[0] != '\0')
873 term_printf(" backing_file=%s", bs->backing_file);
bellardb3380822004-03-14 21:38:54 +0000874 term_printf(" ro=%d", bs->read_only);
bellardea2384d2004-08-01 21:59:26 +0000875 term_printf(" drv=%s", bs->drv->format_name);
876 if (bs->encrypted)
877 term_printf(" encrypted");
bellardb3380822004-03-14 21:38:54 +0000878 } else {
879 term_printf(" [not inserted]");
880 }
881 term_printf("\n");
882 }
883}
bellardea2384d2004-08-01 21:59:26 +0000884
bellard83f64092006-08-01 16:21:11 +0000885void bdrv_get_backing_filename(BlockDriverState *bs,
886 char *filename, int filename_size)
bellardea2384d2004-08-01 21:59:26 +0000887{
bellard83f64092006-08-01 16:21:11 +0000888 if (!bs->backing_hd) {
889 pstrcpy(filename, filename_size, "");
890 } else {
891 pstrcpy(filename, filename_size, bs->backing_file);
892 }
bellardea2384d2004-08-01 21:59:26 +0000893}
894
bellardfaea38e2006-08-05 21:31:00 +0000895int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
896 const uint8_t *buf, int nb_sectors)
897{
898 BlockDriver *drv = bs->drv;
899 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000900 return -ENOMEDIUM;
bellardfaea38e2006-08-05 21:31:00 +0000901 if (!drv->bdrv_write_compressed)
902 return -ENOTSUP;
903 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
904}
905
906int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
907{
908 BlockDriver *drv = bs->drv;
909 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000910 return -ENOMEDIUM;
bellardfaea38e2006-08-05 21:31:00 +0000911 if (!drv->bdrv_get_info)
912 return -ENOTSUP;
913 memset(bdi, 0, sizeof(*bdi));
914 return drv->bdrv_get_info(bs, bdi);
915}
916
917/**************************************************************/
918/* handling of snapshots */
919
920int bdrv_snapshot_create(BlockDriverState *bs,
921 QEMUSnapshotInfo *sn_info)
922{
923 BlockDriver *drv = bs->drv;
924 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000925 return -ENOMEDIUM;
bellardfaea38e2006-08-05 21:31:00 +0000926 if (!drv->bdrv_snapshot_create)
927 return -ENOTSUP;
928 return drv->bdrv_snapshot_create(bs, sn_info);
929}
930
931int bdrv_snapshot_goto(BlockDriverState *bs,
932 const char *snapshot_id)
933{
934 BlockDriver *drv = bs->drv;
935 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000936 return -ENOMEDIUM;
bellardfaea38e2006-08-05 21:31:00 +0000937 if (!drv->bdrv_snapshot_goto)
938 return -ENOTSUP;
939 return drv->bdrv_snapshot_goto(bs, snapshot_id);
940}
941
942int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
943{
944 BlockDriver *drv = bs->drv;
945 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000946 return -ENOMEDIUM;
bellardfaea38e2006-08-05 21:31:00 +0000947 if (!drv->bdrv_snapshot_delete)
948 return -ENOTSUP;
949 return drv->bdrv_snapshot_delete(bs, snapshot_id);
950}
951
952int bdrv_snapshot_list(BlockDriverState *bs,
953 QEMUSnapshotInfo **psn_info)
954{
955 BlockDriver *drv = bs->drv;
956 if (!drv)
bellard19cb3732006-08-19 11:45:59 +0000957 return -ENOMEDIUM;
bellardfaea38e2006-08-05 21:31:00 +0000958 if (!drv->bdrv_snapshot_list)
959 return -ENOTSUP;
960 return drv->bdrv_snapshot_list(bs, psn_info);
961}
962
963#define NB_SUFFIXES 4
964
965char *get_human_readable_size(char *buf, int buf_size, int64_t size)
966{
967 static const char suffixes[NB_SUFFIXES] = "KMGT";
968 int64_t base;
969 int i;
970
971 if (size <= 999) {
972 snprintf(buf, buf_size, "%" PRId64, size);
973 } else {
974 base = 1024;
975 for(i = 0; i < NB_SUFFIXES; i++) {
976 if (size < (10 * base)) {
977 snprintf(buf, buf_size, "%0.1f%c",
978 (double)size / base,
979 suffixes[i]);
980 break;
981 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
982 snprintf(buf, buf_size, "%" PRId64 "%c",
983 ((size + (base >> 1)) / base),
984 suffixes[i]);
985 break;
986 }
987 base = base * 1024;
988 }
989 }
990 return buf;
991}
992
993char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
994{
995 char buf1[128], date_buf[128], clock_buf[128];
996 struct tm tm;
997 time_t ti;
998 int64_t secs;
999
1000 if (!sn) {
1001 snprintf(buf, buf_size,
1002 "%-10s%-20s%7s%20s%15s",
1003 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1004 } else {
1005 ti = sn->date_sec;
pbrookce1a14d2006-08-07 02:38:06 +00001006#ifndef _WIN32
bellardfaea38e2006-08-05 21:31:00 +00001007 localtime_r(&ti, &tm);
pbrookce1a14d2006-08-07 02:38:06 +00001008#endif
bellardfaea38e2006-08-05 21:31:00 +00001009 strftime(date_buf, sizeof(date_buf),
1010 "%Y-%m-%d %H:%M:%S", &tm);
1011 secs = sn->vm_clock_nsec / 1000000000;
1012 snprintf(clock_buf, sizeof(clock_buf),
1013 "%02d:%02d:%02d.%03d",
1014 (int)(secs / 3600),
1015 (int)((secs / 60) % 60),
1016 (int)(secs % 60),
1017 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1018 snprintf(buf, buf_size,
1019 "%-10s%-20s%7s%20s%15s",
1020 sn->id_str, sn->name,
1021 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1022 date_buf,
1023 clock_buf);
1024 }
1025 return buf;
1026}
1027
bellardea2384d2004-08-01 21:59:26 +00001028
bellard83f64092006-08-01 16:21:11 +00001029/**************************************************************/
1030/* async I/Os */
1031
pbrookce1a14d2006-08-07 02:38:06 +00001032BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1033 uint8_t *buf, int nb_sectors,
1034 BlockDriverCompletionFunc *cb, void *opaque)
bellard83f64092006-08-01 16:21:11 +00001035{
1036 BlockDriver *drv = bs->drv;
bellard83f64092006-08-01 16:21:11 +00001037
bellard19cb3732006-08-19 11:45:59 +00001038 if (!drv)
pbrookce1a14d2006-08-07 02:38:06 +00001039 return NULL;
bellard83f64092006-08-01 16:21:11 +00001040
1041 /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
1042 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1043 memcpy(buf, bs->boot_sector_data, 512);
1044 sector_num++;
1045 nb_sectors--;
1046 buf += 512;
1047 }
1048
pbrookce1a14d2006-08-07 02:38:06 +00001049 return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
bellard83f64092006-08-01 16:21:11 +00001050}
1051
pbrookce1a14d2006-08-07 02:38:06 +00001052BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1053 const uint8_t *buf, int nb_sectors,
1054 BlockDriverCompletionFunc *cb, void *opaque)
bellard83f64092006-08-01 16:21:11 +00001055{
bellard83f64092006-08-01 16:21:11 +00001056 BlockDriver *drv = bs->drv;
1057
bellard19cb3732006-08-19 11:45:59 +00001058 if (!drv)
pbrookce1a14d2006-08-07 02:38:06 +00001059 return NULL;
bellard83f64092006-08-01 16:21:11 +00001060 if (bs->read_only)
pbrookce1a14d2006-08-07 02:38:06 +00001061 return NULL;
bellard83f64092006-08-01 16:21:11 +00001062 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1063 memcpy(bs->boot_sector_data, buf, 512);
bellardea2384d2004-08-01 21:59:26 +00001064 }
bellard83f64092006-08-01 16:21:11 +00001065
pbrookce1a14d2006-08-07 02:38:06 +00001066 return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
bellard83f64092006-08-01 16:21:11 +00001067}
1068
1069void bdrv_aio_cancel(BlockDriverAIOCB *acb)
pbrookce1a14d2006-08-07 02:38:06 +00001070{
1071 BlockDriver *drv = acb->bs->drv;
bellard83f64092006-08-01 16:21:11 +00001072
1073 drv->bdrv_aio_cancel(acb);
bellard83f64092006-08-01 16:21:11 +00001074}
1075
pbrookce1a14d2006-08-07 02:38:06 +00001076
bellard83f64092006-08-01 16:21:11 +00001077/**************************************************************/
1078/* async block device emulation */
1079
1080#ifdef QEMU_TOOL
pbrookce1a14d2006-08-07 02:38:06 +00001081static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1082 int64_t sector_num, uint8_t *buf, int nb_sectors,
1083 BlockDriverCompletionFunc *cb, void *opaque)
bellardea2384d2004-08-01 21:59:26 +00001084{
bellardea2384d2004-08-01 21:59:26 +00001085 int ret;
pbrookce1a14d2006-08-07 02:38:06 +00001086 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1087 cb(opaque, ret);
1088 return NULL;
bellardea2384d2004-08-01 21:59:26 +00001089}
1090
pbrookce1a14d2006-08-07 02:38:06 +00001091static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1092 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1093 BlockDriverCompletionFunc *cb, void *opaque)
bellardea2384d2004-08-01 21:59:26 +00001094{
bellardea2384d2004-08-01 21:59:26 +00001095 int ret;
pbrookce1a14d2006-08-07 02:38:06 +00001096 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1097 cb(opaque, ret);
1098 return NULL;
bellardea2384d2004-08-01 21:59:26 +00001099}
1100
bellard83f64092006-08-01 16:21:11 +00001101static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
bellardea2384d2004-08-01 21:59:26 +00001102{
bellardea2384d2004-08-01 21:59:26 +00001103}
bellardbeac80c2006-06-26 20:08:57 +00001104#else
bellard83f64092006-08-01 16:21:11 +00001105static void bdrv_aio_bh_cb(void *opaque)
bellardbeac80c2006-06-26 20:08:57 +00001106{
pbrookce1a14d2006-08-07 02:38:06 +00001107 BlockDriverAIOCBSync *acb = opaque;
1108 acb->common.cb(acb->common.opaque, acb->ret);
1109 qemu_aio_release(acb);
bellardbeac80c2006-06-26 20:08:57 +00001110}
bellardbeac80c2006-06-26 20:08:57 +00001111
pbrookce1a14d2006-08-07 02:38:06 +00001112static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1113 int64_t sector_num, uint8_t *buf, int nb_sectors,
1114 BlockDriverCompletionFunc *cb, void *opaque)
bellardea2384d2004-08-01 21:59:26 +00001115{
pbrookce1a14d2006-08-07 02:38:06 +00001116 BlockDriverAIOCBSync *acb;
bellard83f64092006-08-01 16:21:11 +00001117 int ret;
pbrookce1a14d2006-08-07 02:38:06 +00001118
1119 acb = qemu_aio_get(bs, cb, opaque);
1120 if (!acb->bh)
1121 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1122 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1123 acb->ret = ret;
1124 qemu_bh_schedule(acb->bh);
1125 return &acb->common;
pbrook7a6cba62006-06-04 11:39:07 +00001126}
1127
pbrookce1a14d2006-08-07 02:38:06 +00001128static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1129 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1130 BlockDriverCompletionFunc *cb, void *opaque)
bellard83f64092006-08-01 16:21:11 +00001131{
pbrookce1a14d2006-08-07 02:38:06 +00001132 BlockDriverAIOCBSync *acb;
bellard83f64092006-08-01 16:21:11 +00001133 int ret;
pbrookce1a14d2006-08-07 02:38:06 +00001134
1135 acb = qemu_aio_get(bs, cb, opaque);
1136 if (!acb->bh)
1137 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1138 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1139 acb->ret = ret;
1140 qemu_bh_schedule(acb->bh);
1141 return &acb->common;
bellard83f64092006-08-01 16:21:11 +00001142}
1143
pbrookce1a14d2006-08-07 02:38:06 +00001144static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
bellard83f64092006-08-01 16:21:11 +00001145{
pbrookce1a14d2006-08-07 02:38:06 +00001146 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1147 qemu_bh_cancel(acb->bh);
1148 qemu_aio_release(acb);
bellard83f64092006-08-01 16:21:11 +00001149}
1150#endif /* !QEMU_TOOL */
1151
1152/**************************************************************/
1153/* sync block device emulation */
1154
1155static void bdrv_rw_em_cb(void *opaque, int ret)
1156{
1157 *(int *)opaque = ret;
1158}
1159
1160#define NOT_DONE 0x7fffffff
1161
1162static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1163 uint8_t *buf, int nb_sectors)
1164{
pbrookce1a14d2006-08-07 02:38:06 +00001165 int async_ret;
1166 BlockDriverAIOCB *acb;
bellard83f64092006-08-01 16:21:11 +00001167
bellard83f64092006-08-01 16:21:11 +00001168 async_ret = NOT_DONE;
1169 qemu_aio_wait_start();
pbrookce1a14d2006-08-07 02:38:06 +00001170 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
bellard83f64092006-08-01 16:21:11 +00001171 bdrv_rw_em_cb, &async_ret);
pbrookce1a14d2006-08-07 02:38:06 +00001172 if (acb == NULL) {
bellard83f64092006-08-01 16:21:11 +00001173 qemu_aio_wait_end();
pbrookce1a14d2006-08-07 02:38:06 +00001174 return -1;
bellard83f64092006-08-01 16:21:11 +00001175 }
1176 while (async_ret == NOT_DONE) {
1177 qemu_aio_wait();
1178 }
1179 qemu_aio_wait_end();
1180 return async_ret;
1181}
1182
1183static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1184 const uint8_t *buf, int nb_sectors)
1185{
pbrookce1a14d2006-08-07 02:38:06 +00001186 int async_ret;
1187 BlockDriverAIOCB *acb;
bellard83f64092006-08-01 16:21:11 +00001188
bellard83f64092006-08-01 16:21:11 +00001189 async_ret = NOT_DONE;
1190 qemu_aio_wait_start();
pbrookce1a14d2006-08-07 02:38:06 +00001191 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
bellard83f64092006-08-01 16:21:11 +00001192 bdrv_rw_em_cb, &async_ret);
pbrookce1a14d2006-08-07 02:38:06 +00001193 if (acb == NULL) {
bellard83f64092006-08-01 16:21:11 +00001194 qemu_aio_wait_end();
pbrookce1a14d2006-08-07 02:38:06 +00001195 return -1;
bellard83f64092006-08-01 16:21:11 +00001196 }
1197 while (async_ret == NOT_DONE) {
1198 qemu_aio_wait();
1199 }
1200 qemu_aio_wait_end();
1201 return async_ret;
1202}
bellardea2384d2004-08-01 21:59:26 +00001203
1204void bdrv_init(void)
1205{
1206 bdrv_register(&bdrv_raw);
bellard19cb3732006-08-19 11:45:59 +00001207 bdrv_register(&bdrv_host_device);
bellardea2384d2004-08-01 21:59:26 +00001208#ifndef _WIN32
1209 bdrv_register(&bdrv_cow);
1210#endif
1211 bdrv_register(&bdrv_qcow);
1212 bdrv_register(&bdrv_vmdk);
bellard3c565212004-09-29 21:29:14 +00001213 bdrv_register(&bdrv_cloop);
bellard585d0ed2004-12-12 11:24:44 +00001214 bdrv_register(&bdrv_dmg);
bellarda8753c32005-04-26 21:34:00 +00001215 bdrv_register(&bdrv_bochs);
bellard6a0f9e82005-04-27 20:17:58 +00001216 bdrv_register(&bdrv_vpc);
bellard712e7872005-04-28 21:09:32 +00001217 bdrv_register(&bdrv_vvfat);
bellardfaea38e2006-08-05 21:31:00 +00001218 bdrv_register(&bdrv_qcow2);
bellardea2384d2004-08-01 21:59:26 +00001219}
pbrookce1a14d2006-08-07 02:38:06 +00001220
1221void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1222 void *opaque)
1223{
1224 BlockDriver *drv;
1225 BlockDriverAIOCB *acb;
1226
1227 drv = bs->drv;
1228 if (drv->free_aiocb) {
1229 acb = drv->free_aiocb;
1230 drv->free_aiocb = acb->next;
1231 } else {
1232 acb = qemu_mallocz(drv->aiocb_size);
1233 if (!acb)
1234 return NULL;
1235 }
1236 acb->bs = bs;
1237 acb->cb = cb;
1238 acb->opaque = opaque;
1239 return acb;
1240}
1241
1242void qemu_aio_release(void *p)
1243{
1244 BlockDriverAIOCB *acb = p;
1245 BlockDriver *drv = acb->bs->drv;
1246 acb->next = drv->free_aiocb;
1247 drv->free_aiocb = acb;
1248}
bellard19cb3732006-08-19 11:45:59 +00001249
1250/**************************************************************/
1251/* removable device support */
1252
1253/**
1254 * Return TRUE if the media is present
1255 */
1256int bdrv_is_inserted(BlockDriverState *bs)
1257{
1258 BlockDriver *drv = bs->drv;
1259 int ret;
1260 if (!drv)
1261 return 0;
1262 if (!drv->bdrv_is_inserted)
1263 return 1;
1264 ret = drv->bdrv_is_inserted(bs);
1265 return ret;
1266}
1267
1268/**
1269 * Return TRUE if the media changed since the last call to this
1270 * function. It is currently only used for floppy disks
1271 */
1272int bdrv_media_changed(BlockDriverState *bs)
1273{
1274 BlockDriver *drv = bs->drv;
1275 int ret;
1276
1277 if (!drv || !drv->bdrv_media_changed)
1278 ret = -ENOTSUP;
1279 else
1280 ret = drv->bdrv_media_changed(bs);
1281 if (ret == -ENOTSUP)
1282 ret = bs->media_changed;
1283 bs->media_changed = 0;
1284 return ret;
1285}
1286
1287/**
1288 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1289 */
1290void bdrv_eject(BlockDriverState *bs, int eject_flag)
1291{
1292 BlockDriver *drv = bs->drv;
1293 int ret;
1294
1295 if (!drv || !drv->bdrv_eject) {
1296 ret = -ENOTSUP;
1297 } else {
1298 ret = drv->bdrv_eject(bs, eject_flag);
1299 }
1300 if (ret == -ENOTSUP) {
1301 if (eject_flag)
1302 bdrv_close(bs);
1303 }
1304}
1305
1306int bdrv_is_locked(BlockDriverState *bs)
1307{
1308 return bs->locked;
1309}
1310
1311/**
1312 * Lock or unlock the media (if it is locked, the user won't be able
1313 * to eject it manually).
1314 */
1315void bdrv_set_locked(BlockDriverState *bs, int locked)
1316{
1317 BlockDriver *drv = bs->drv;
1318
1319 bs->locked = locked;
1320 if (drv && drv->bdrv_set_locked) {
1321 drv->bdrv_set_locked(bs, locked);
1322 }
1323}