blob: 8da66379f7ea7afceb9af2f32f998d7ca71c25a7 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#ifndef _LINUX_BLKDEV_H
3#define _LINUX_BLKDEV_H
4
Russell King85fd0bc2012-05-14 08:29:23 +02005#include <linux/sched.h>
Ingo Molnare6017572017-02-01 16:36:40 +01006#include <linux/sched/clock.h>
Russell King85fd0bc2012-05-14 08:29:23 +02007
Jens Axboef5ff8422007-09-21 09:19:54 +02008#ifdef CONFIG_BLOCK
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/major.h>
11#include <linux/genhd.h>
12#include <linux/list.h>
Jens Axboe320ae512013-10-24 09:20:05 +010013#include <linux/llist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/timer.h>
15#include <linux/workqueue.h>
16#include <linux/pagemap.h>
Tejun Heo66114ca2015-05-22 17:13:32 -040017#include <linux/backing-dev-defs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/wait.h>
19#include <linux/mempool.h>
Dan Williams34c0fd52016-01-15 16:56:14 -080020#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/bio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/stringify.h>
Hugh Dickins3e6053d2008-09-11 10:57:55 +020023#include <linux/gfp.h>
FUJITA Tomonorid351af02007-07-09 12:40:35 +020024#include <linux/bsg.h>
Jens Axboec7c22e42008-09-13 20:26:01 +020025#include <linux/smp.h>
Tejun Heo548bc8e2013-01-09 08:05:13 -080026#include <linux/rcupdate.h>
Tejun Heoadd703f2014-07-01 10:34:38 -060027#include <linux/percpu-refcount.h>
Christoph Hellwig84be4562015-05-01 12:46:15 +020028#include <linux/scatterlist.h>
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +090029#include <linux/blkzoned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Paul Gortmakerde477252011-05-26 13:46:22 -040031struct module;
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +010032struct scsi_ioctl_command;
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034struct request_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035struct elevator_queue;
Jens Axboe2056a782006-03-23 20:00:26 +010036struct blk_trace;
Jens Axboe3d6392c2007-07-09 12:38:05 +020037struct request;
38struct sg_io_hdr;
Mike Christieaa387cc2011-07-31 22:05:09 +020039struct bsg_job;
Tejun Heo3c798392012-04-16 13:57:25 -070040struct blkcg_gq;
Ming Lei7c94e1c2014-09-25 23:23:43 +080041struct blk_flush_queue;
Christoph Hellwigbbd3e062015-10-15 14:10:48 +020042struct pr_ops;
Jens Axboe87760e52016-11-09 12:38:14 -070043struct rq_wb;
Omar Sandoval34dbad52017-03-21 08:56:08 -070044struct blk_queue_stats;
45struct blk_stat_callback;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47#define BLKDEV_MIN_RQ 4
48#define BLKDEV_MAX_RQ 128 /* Default maximum */
49
Stephen Bates02063192017-04-20 16:59:11 -060050/* Must be consisitent with blk_mq_poll_stats_bkt() */
51#define BLK_MQ_POLL_STATS_BKTS 16
52
Tejun Heo8bd435b2012-04-13 13:11:28 -070053/*
54 * Maximum number of blkcg policies allowed to be registered concurrently.
55 * Defined here to simplify include dependency.
56 */
Arianna Avanzinie21b7a02017-04-12 18:23:08 +020057#define BLKCG_MAX_POLS 3
Tejun Heo8bd435b2012-04-13 13:11:28 -070058
Christoph Hellwig2a842ac2017-06-03 09:38:04 +020059typedef void (rq_end_io_fn)(struct request *, blk_status_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Tejun Heo5b788ce2012-06-04 20:40:59 -070061#define BLK_RL_SYNCFULL (1U << 0)
62#define BLK_RL_ASYNCFULL (1U << 1)
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064struct request_list {
Tejun Heo5b788ce2012-06-04 20:40:59 -070065 struct request_queue *q; /* the queue this rl belongs to */
Tejun Heoa0516612012-06-26 15:05:44 -070066#ifdef CONFIG_BLK_CGROUP
67 struct blkcg_gq *blkg; /* blkg this request pool belongs to */
68#endif
Jens Axboe1faa16d2009-04-06 14:48:01 +020069 /*
70 * count[], starved[], and wait[] are indexed by
71 * BLK_RW_SYNC/BLK_RW_ASYNC
72 */
Tejun Heo8a5ecdd2012-06-04 20:40:58 -070073 int count[2];
74 int starved[2];
75 mempool_t *rq_pool;
76 wait_queue_head_t wait[2];
Tejun Heo5b788ce2012-06-04 20:40:59 -070077 unsigned int flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078};
79
Jens Axboe4aff5e22006-08-10 08:44:47 +020080/*
Christoph Hellwige8064022016-10-20 15:12:13 +020081 * request flags */
82typedef __u32 __bitwise req_flags_t;
83
84/* elevator knows about this request */
85#define RQF_SORTED ((__force req_flags_t)(1 << 0))
86/* drive already may have started this one */
87#define RQF_STARTED ((__force req_flags_t)(1 << 1))
88/* uses tagged queueing */
89#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
90/* may not be passed by ioscheduler */
91#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
92/* request for flush sequence */
93#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
94/* merge of different types, fail separately */
95#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
96/* track inflight for MQ */
97#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
98/* don't call prep for this one */
99#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
100/* set for "ide_preempt" requests and also for requests for which the SCSI
101 "quiesce" state must be ignored. */
102#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
103/* contains copies of user pages */
104#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
105/* vaguely specified driver internal error. Ignored by the block layer */
106#define RQF_FAILED ((__force req_flags_t)(1 << 10))
107/* don't warn about errors */
108#define RQF_QUIET ((__force req_flags_t)(1 << 11))
109/* elevator private data attached */
110#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
111/* account I/O stat */
112#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
113/* request came from our alloc pool */
114#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
115/* runtime pm request */
116#define RQF_PM ((__force req_flags_t)(1 << 15))
117/* on IO scheduler merge hash */
118#define RQF_HASHED ((__force req_flags_t)(1 << 16))
Jens Axboecf43e6b2016-11-07 21:32:37 -0700119/* IO stats tracking on */
120#define RQF_STATS ((__force req_flags_t)(1 << 17))
Christoph Hellwigf9d03f92016-12-08 15:20:32 -0700121/* Look at ->special_vec for the actual data payload instead of the
122 bio chain. */
123#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
Christoph Hellwige8064022016-10-20 15:12:13 +0200124
125/* flags that prevent us from merging requests: */
126#define RQF_NOMERGE_FLAGS \
Christoph Hellwigf9d03f92016-12-08 15:20:32 -0700127 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
Christoph Hellwige8064022016-10-20 15:12:13 +0200128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129/*
Christoph Hellwigaf76e552014-05-06 12:12:45 +0200130 * Try to put the fields that are referenced together in the same cacheline.
131 *
132 * If you modify this structure, make sure to update blk_rq_init() and
133 * especially blk_mq_rq_ctx_init() to take care of the added fields.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 */
135struct request {
Christoph Hellwig6897fc22014-01-30 15:45:47 -0800136 struct list_head queuelist;
Jens Axboe320ae512013-10-24 09:20:05 +0100137 union {
Ying Huang966a9672017-08-08 12:30:00 +0800138 call_single_data_t csd;
Jan Kara9828c2c2016-06-28 09:03:59 +0200139 u64 fifo_time;
Jens Axboe320ae512013-10-24 09:20:05 +0100140 };
Jens Axboeff856ba2006-01-09 16:02:34 +0100141
Jens Axboe165125e2007-07-24 09:28:11 +0200142 struct request_queue *q;
Jens Axboe320ae512013-10-24 09:20:05 +0100143 struct blk_mq_ctx *mq_ctx;
Jens Axboee6a1c872006-08-10 09:00:21 +0200144
Richard Kennedy181fdde2010-03-19 08:58:16 +0100145 int cpu;
Christoph Hellwigef295ec2016-10-28 08:48:16 -0600146 unsigned int cmd_flags; /* op and common flags */
Christoph Hellwige8064022016-10-20 15:12:13 +0200147 req_flags_t rq_flags;
Jens Axboed486f1f2017-01-31 12:34:41 -0700148
149 int internal_tag;
150
Christoph Hellwigca93e452016-06-09 16:00:35 +0200151 unsigned long atomic_flags;
Richard Kennedy181fdde2010-03-19 08:58:16 +0100152
Tejun Heoa2dec7b2009-05-07 22:24:44 +0900153 /* the following two fields are internal, NEVER access directly */
Tejun Heoa2dec7b2009-05-07 22:24:44 +0900154 unsigned int __data_len; /* total data len */
Jens Axboebd166ef2017-01-17 06:03:22 -0700155 int tag;
Richard Kennedy181fdde2010-03-19 08:58:16 +0100156 sector_t __sector; /* sector cursor */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158 struct bio *bio;
159 struct bio *biotail;
160
Jens Axboe360f92c2014-04-09 20:27:01 -0600161 /*
162 * The hash is used inside the scheduler, and killed once the
163 * request reaches the dispatch list. The ipi_list is only used
164 * to queue the request for softirq completion, which is long
165 * after the request has been unhashed (and even removed from
166 * the dispatch list).
167 */
168 union {
169 struct hlist_node hash; /* merge hash */
170 struct list_head ipi_list;
171 };
172
Jens Axboee6a1c872006-08-10 09:00:21 +0200173 /*
174 * The rb_node is only used inside the io scheduler, requests
175 * are pruned when moved to the dispatch queue. So let the
Mike Snitzerc1867942011-02-11 11:08:00 +0100176 * completion_data share space with the rb_node.
Jens Axboee6a1c872006-08-10 09:00:21 +0200177 */
178 union {
179 struct rb_node rb_node; /* sort/lookup */
Christoph Hellwigf9d03f92016-12-08 15:20:32 -0700180 struct bio_vec special_vec;
Mike Snitzerc1867942011-02-11 11:08:00 +0100181 void *completion_data;
Christoph Hellwige26738e2017-04-20 16:03:11 +0200182 int error_count; /* for legacy drivers, don't use */
Jens Axboee6a1c872006-08-10 09:00:21 +0200183 };
Jens Axboe98170642006-07-28 09:23:08 +0200184
Jens Axboeff7d1452006-07-12 14:04:37 +0200185 /*
Vivek Goyal7f1dc8a2010-04-21 17:44:16 +0200186 * Three pointers are available for the IO schedulers, if they need
Mike Snitzerc1867942011-02-11 11:08:00 +0100187 * more they have to dynamically allocate it. Flush requests are
188 * never put on the IO scheduler. So let the flush fields share
Tejun Heoa612fdd2011-12-14 00:33:41 +0100189 * space with the elevator data.
Jens Axboeff7d1452006-07-12 14:04:37 +0200190 */
Mike Snitzerc1867942011-02-11 11:08:00 +0100191 union {
Tejun Heoa612fdd2011-12-14 00:33:41 +0100192 struct {
193 struct io_cq *icq;
194 void *priv[2];
195 } elv;
196
Mike Snitzerc1867942011-02-11 11:08:00 +0100197 struct {
198 unsigned int seq;
199 struct list_head list;
Jeff Moyer4853aba2011-08-15 21:37:25 +0200200 rq_end_io_fn *saved_end_io;
Mike Snitzerc1867942011-02-11 11:08:00 +0100201 } flush;
202 };
Jens Axboeff7d1452006-07-12 14:04:37 +0200203
Jens Axboe8f34ee72006-06-13 09:02:34 +0200204 struct gendisk *rq_disk;
Jerome Marchand09e099d2011-01-05 16:57:38 +0100205 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 unsigned long start_time;
Jens Axboecf43e6b2016-11-07 21:32:37 -0700207 struct blk_issue_stat issue_stat;
Divyesh Shah91952912010-04-01 15:01:41 -0700208#ifdef CONFIG_BLK_CGROUP
Tejun Heoa0516612012-06-26 15:05:44 -0700209 struct request_list *rl; /* rl this rq is alloced from */
Divyesh Shah91952912010-04-01 15:01:41 -0700210 unsigned long long start_time_ns;
211 unsigned long long io_start_time_ns; /* when passed to hardware */
212#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 /* Number of scatter-gather DMA addr+len pairs after
214 * physical address coalescing is performed.
215 */
216 unsigned short nr_phys_segments;
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200217#if defined(CONFIG_BLK_DEV_INTEGRITY)
218 unsigned short nr_integrity_segments;
219#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Jens Axboe8f34ee72006-06-13 09:02:34 +0200221 unsigned short ioprio;
222
Jens Axboe1dd51982017-04-05 12:16:38 -0600223 unsigned int timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 void *special; /* opaque pointer available for LLD use */
Jens Axboecdd60262006-07-28 09:32:07 +0200226
FUJITA Tomonori7a85f882008-03-04 11:17:11 +0100227 unsigned int extra_len; /* length of alignment and padding */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Jens Axboecb6934f2017-06-27 09:22:02 -0600229 unsigned short write_hint;
230
Jens Axboe242f9dc2008-09-14 05:55:09 -0700231 unsigned long deadline;
232 struct list_head timeout_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 /*
Jens Axboec00895a2006-09-30 20:29:12 +0200235 * completion callback.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 */
237 rq_end_io_fn *end_io;
238 void *end_io_data;
FUJITA Tomonoriabae1fd2007-07-16 08:52:14 +0200239
240 /* for bidi */
241 struct request *next_rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242};
243
Christoph Hellwigaebf5262017-01-31 16:57:31 +0100244static inline bool blk_rq_is_scsi(struct request *rq)
245{
246 return req_op(rq) == REQ_OP_SCSI_IN || req_op(rq) == REQ_OP_SCSI_OUT;
247}
248
249static inline bool blk_rq_is_private(struct request *rq)
250{
251 return req_op(rq) == REQ_OP_DRV_IN || req_op(rq) == REQ_OP_DRV_OUT;
252}
253
Christoph Hellwig57292b52017-01-31 16:57:29 +0100254static inline bool blk_rq_is_passthrough(struct request *rq)
255{
Christoph Hellwigaebf5262017-01-31 16:57:31 +0100256 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
Christoph Hellwig57292b52017-01-31 16:57:29 +0100257}
258
Fernando Luis Vázquez Cao766ca442008-08-14 09:59:13 +0200259static inline unsigned short req_get_ioprio(struct request *req)
260{
261 return req->ioprio;
262}
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264#include <linux/elevator.h>
265
Jens Axboe320ae512013-10-24 09:20:05 +0100266struct blk_queue_ctx;
267
Jens Axboe165125e2007-07-24 09:28:11 +0200268typedef void (request_fn_proc) (struct request_queue *q);
Jens Axboedece1632015-11-05 10:41:16 -0700269typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
Jens Axboe165125e2007-07-24 09:28:11 +0200270typedef int (prep_rq_fn) (struct request_queue *, struct request *);
James Bottomley28018c22010-07-01 19:49:17 +0900271typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273struct bio_vec;
Jens Axboeff856ba2006-01-09 16:02:34 +0100274typedef void (softirq_done_fn)(struct request *);
Tejun Heo2fb98e82008-02-19 11:36:53 +0100275typedef int (dma_drain_needed_fn)(struct request *);
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +0200276typedef int (lld_busy_fn) (struct request_queue *q);
Mike Christieaa387cc2011-07-31 22:05:09 +0200277typedef int (bsg_job_fn) (struct bsg_job *);
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700278typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
279typedef void (exit_rq_fn)(struct request_queue *, struct request *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Jens Axboe242f9dc2008-09-14 05:55:09 -0700281enum blk_eh_timer_return {
282 BLK_EH_NOT_HANDLED,
283 BLK_EH_HANDLED,
284 BLK_EH_RESET_TIMER,
285};
286
287typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289enum blk_queue_state {
290 Queue_down,
291 Queue_up,
292};
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294struct blk_queue_tag {
295 struct request **tag_index; /* map of busy tags */
296 unsigned long *tag_map; /* bit map of free/busy tags */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 int max_depth; /* what we will send to device */
Tejun Heoba025082005-08-05 13:28:11 -0700298 int real_max_depth; /* what the array can hold */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 atomic_t refcnt; /* map can be shared */
Shaohua Liee1b6f72015-01-15 17:32:25 -0800300 int alloc_policy; /* tag allocation policy */
301 int next_tag; /* next tag */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302};
Shaohua Liee1b6f72015-01-15 17:32:25 -0800303#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
304#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900306#define BLK_SCSI_MAX_CMDS (256)
307#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
308
Damien Le Moal797476b2016-10-18 15:40:29 +0900309/*
310 * Zoned block device models (zoned limit).
311 */
312enum blk_zoned_model {
313 BLK_ZONED_NONE, /* Regular block device */
314 BLK_ZONED_HA, /* Host-aware zoned block device */
315 BLK_ZONED_HM, /* Host-managed zoned block device */
316};
317
Martin K. Petersen025146e2009-05-22 17:17:51 -0400318struct queue_limits {
319 unsigned long bounce_pfn;
320 unsigned long seg_boundary_mask;
Keith Busch03100aa2015-08-19 14:24:05 -0700321 unsigned long virt_boundary_mask;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400322
323 unsigned int max_hw_sectors;
Martin K. Petersenca369d52015-11-13 16:46:48 -0500324 unsigned int max_dev_sectors;
Jens Axboe762380a2014-06-05 13:38:39 -0600325 unsigned int chunk_sectors;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400326 unsigned int max_sectors;
327 unsigned int max_segment_size;
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400328 unsigned int physical_block_size;
329 unsigned int alignment_offset;
330 unsigned int io_min;
331 unsigned int io_opt;
Christoph Hellwig67efc922009-09-30 13:54:20 +0200332 unsigned int max_discard_sectors;
Jens Axboe0034af02015-07-16 09:14:26 -0600333 unsigned int max_hw_discard_sectors;
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400334 unsigned int max_write_same_sectors;
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800335 unsigned int max_write_zeroes_sectors;
Martin K. Petersen86b37282009-11-10 11:50:21 +0100336 unsigned int discard_granularity;
337 unsigned int discard_alignment;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400338
339 unsigned short logical_block_size;
Martin K. Petersen8a783622010-02-26 00:20:39 -0500340 unsigned short max_segments;
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200341 unsigned short max_integrity_segments;
Christoph Hellwig1e739732017-02-08 14:46:49 +0100342 unsigned short max_discard_segments;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400343
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400344 unsigned char misaligned;
Martin K. Petersen86b37282009-11-10 11:50:21 +0100345 unsigned char discard_misaligned;
Martin K. Petersene692cb62010-12-01 19:41:49 +0100346 unsigned char cluster;
Kent Overstreetc78afc62013-07-11 22:39:53 -0700347 unsigned char raid_partial_stripes_expensive;
Damien Le Moal797476b2016-10-18 15:40:29 +0900348 enum blk_zoned_model zoned;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400349};
350
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +0900351#ifdef CONFIG_BLK_DEV_ZONED
352
353struct blk_zone_report_hdr {
354 unsigned int nr_zones;
355 u8 padding[60];
356};
357
358extern int blkdev_report_zones(struct block_device *bdev,
359 sector_t sector, struct blk_zone *zones,
360 unsigned int *nr_zones, gfp_t gfp_mask);
361extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
362 sector_t nr_sectors, gfp_t gfp_mask);
363
Shaun Tancheff3ed05a92016-10-18 15:40:35 +0900364extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
365 unsigned int cmd, unsigned long arg);
366extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
367 unsigned int cmd, unsigned long arg);
368
369#else /* CONFIG_BLK_DEV_ZONED */
370
371static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
372 fmode_t mode, unsigned int cmd,
373 unsigned long arg)
374{
375 return -ENOTTY;
376}
377
378static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
379 fmode_t mode, unsigned int cmd,
380 unsigned long arg)
381{
382 return -ENOTTY;
383}
384
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +0900385#endif /* CONFIG_BLK_DEV_ZONED */
386
Richard Kennedyd7b76302011-07-13 21:17:23 +0200387struct request_queue {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 /*
389 * Together with queue_head for cacheline sharing
390 */
391 struct list_head queue_head;
392 struct request *last_merge;
Jens Axboeb374d182008-10-31 10:05:07 +0100393 struct elevator_queue *elevator;
Tejun Heo8a5ecdd2012-06-04 20:40:58 -0700394 int nr_rqs[2]; /* # allocated [a]sync rqs */
395 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Jens Axboe8e8320c2017-06-20 17:56:13 -0600397 atomic_t shared_hctx_restart;
398
Omar Sandoval34dbad52017-03-21 08:56:08 -0700399 struct blk_queue_stats *stats;
Jens Axboe87760e52016-11-09 12:38:14 -0700400 struct rq_wb *rq_wb;
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 /*
Tejun Heoa0516612012-06-26 15:05:44 -0700403 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
404 * is used, root blkg allocates from @q->root_rl and all other
405 * blkgs from their own blkg->rl. Which one to use should be
406 * determined using bio_request_list().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 */
Tejun Heoa0516612012-06-26 15:05:44 -0700408 struct request_list root_rl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 request_fn_proc *request_fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 make_request_fn *make_request_fn;
412 prep_rq_fn *prep_rq_fn;
James Bottomley28018c22010-07-01 19:49:17 +0900413 unprep_rq_fn *unprep_rq_fn;
Jens Axboeff856ba2006-01-09 16:02:34 +0100414 softirq_done_fn *softirq_done_fn;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700415 rq_timed_out_fn *rq_timed_out_fn;
Tejun Heo2fb98e82008-02-19 11:36:53 +0100416 dma_drain_needed_fn *dma_drain_needed;
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +0200417 lld_busy_fn *lld_busy_fn;
Bart Van Assched280bab2017-06-20 11:15:40 -0700418 /* Called just after a request is allocated */
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700419 init_rq_fn *init_rq_fn;
Bart Van Assched280bab2017-06-20 11:15:40 -0700420 /* Called just before a request is freed */
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700421 exit_rq_fn *exit_rq_fn;
Bart Van Assched280bab2017-06-20 11:15:40 -0700422 /* Called from inside blk_get_request() */
423 void (*initialize_rq_fn)(struct request *rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Jens Axboef8a5b122016-12-13 09:24:51 -0700425 const struct blk_mq_ops *mq_ops;
Jens Axboe320ae512013-10-24 09:20:05 +0100426
427 unsigned int *mq_map;
428
429 /* sw queues */
Ming Leie6cdb092014-06-03 11:24:06 +0800430 struct blk_mq_ctx __percpu *queue_ctx;
Jens Axboe320ae512013-10-24 09:20:05 +0100431 unsigned int nr_queues;
432
Jens Axboed278d4a2016-03-30 10:21:08 -0600433 unsigned int queue_depth;
434
Jens Axboe320ae512013-10-24 09:20:05 +0100435 /* hw dispatch queues */
436 struct blk_mq_hw_ctx **queue_hw_ctx;
437 unsigned int nr_hw_queues;
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 /*
Tejun Heo8922e162005-10-20 16:23:44 +0200440 * Dispatch queue sorting
441 */
Jens Axboe1b47f532005-10-20 16:37:00 +0200442 sector_t end_sector;
Tejun Heo8922e162005-10-20 16:23:44 +0200443 struct request *boundary_rq;
Tejun Heo8922e162005-10-20 16:23:44 +0200444
445 /*
Jens Axboe3cca6dc2011-03-02 11:08:00 -0500446 * Delayed queue handling
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 */
Jens Axboe3cca6dc2011-03-02 11:08:00 -0500448 struct delayed_work delay_work;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Jan Karadc3b17c2017-02-02 15:56:50 +0100450 struct backing_dev_info *backing_dev_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452 /*
453 * The queue owner gets to use this for whatever they like.
454 * ll_rw_blk doesn't touch it.
455 */
456 void *queuedata;
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 * various queue flags, see QUEUE_* below
460 */
461 unsigned long queue_flags;
462
463 /*
Tejun Heoa73f7302011-12-14 00:33:37 +0100464 * ida allocated id for this queue. Used to index queues from
465 * ioctx.
466 */
467 int id;
468
469 /*
Richard Kennedyd7b76302011-07-13 21:17:23 +0200470 * queue needs bounce pages for pages above this limit
471 */
472 gfp_t bounce_gfp;
473
474 /*
152587d2005-04-12 16:22:06 -0500475 * protects queue structures from reentrancy. ->__queue_lock should
476 * _never_ be used directly, it is queue private. always use
477 * ->queue_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 */
152587d2005-04-12 16:22:06 -0500479 spinlock_t __queue_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 spinlock_t *queue_lock;
481
482 /*
483 * queue kobject
484 */
485 struct kobject kobj;
486
Jens Axboe320ae512013-10-24 09:20:05 +0100487 /*
488 * mq queue kobject
489 */
490 struct kobject mq_kobj;
491
Dan Williamsac6fc482015-10-21 13:20:18 -0400492#ifdef CONFIG_BLK_DEV_INTEGRITY
493 struct blk_integrity integrity;
494#endif /* CONFIG_BLK_DEV_INTEGRITY */
495
Rafael J. Wysocki47fafbc2014-12-04 01:00:23 +0100496#ifdef CONFIG_PM
Lin Ming6c954662013-03-23 11:42:26 +0800497 struct device *dev;
498 int rpm_status;
499 unsigned int nr_pending;
500#endif
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 /*
503 * queue settings
504 */
505 unsigned long nr_requests; /* Max # of requests */
506 unsigned int nr_congestion_on;
507 unsigned int nr_congestion_off;
508 unsigned int nr_batching;
509
James Bottomleyfa0ccd82008-01-10 11:30:36 -0600510 unsigned int dma_drain_size;
Richard Kennedyd7b76302011-07-13 21:17:23 +0200511 void *dma_drain_buffer;
Tejun Heoe3790c72008-03-04 11:18:17 +0100512 unsigned int dma_pad_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 unsigned int dma_alignment;
514
515 struct blk_queue_tag *queue_tags;
Jens Axboe6eca9002007-10-25 10:14:47 +0200516 struct list_head tag_busy_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Tejun Heo15853af2005-11-10 08:52:05 +0100518 unsigned int nr_sorted;
Jens Axboe0a7ae2f2009-05-20 08:54:31 +0200519 unsigned int in_flight[2];
Jens Axboecf43e6b2016-11-07 21:32:37 -0700520
Bart Van Assche24faf6f2012-11-28 13:46:45 +0100521 /*
522 * Number of active block driver functions for which blk_drain_queue()
523 * must wait. Must be incremented around functions that unlock the
524 * queue_lock internally, e.g. scsi_request_fn().
525 */
526 unsigned int request_fn_active;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Jens Axboe242f9dc2008-09-14 05:55:09 -0700528 unsigned int rq_timeout;
Jens Axboe64f1c212016-11-14 13:03:03 -0700529 int poll_nsec;
Omar Sandoval34dbad52017-03-21 08:56:08 -0700530
531 struct blk_stat_callback *poll_cb;
Stephen Bates02063192017-04-20 16:59:11 -0600532 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
Omar Sandoval34dbad52017-03-21 08:56:08 -0700533
Jens Axboe242f9dc2008-09-14 05:55:09 -0700534 struct timer_list timeout;
Christoph Hellwig287922e2015-10-30 20:57:30 +0800535 struct work_struct timeout_work;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700536 struct list_head timeout_list;
537
Tejun Heoa612fdd2011-12-14 00:33:41 +0100538 struct list_head icq_list;
Tejun Heo4eef3042012-03-05 13:15:18 -0800539#ifdef CONFIG_BLK_CGROUP
Tejun Heoa2b16932012-04-13 13:11:33 -0700540 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
Tejun Heo3c798392012-04-16 13:57:25 -0700541 struct blkcg_gq *root_blkg;
Tejun Heo03aa2642012-03-05 13:15:19 -0800542 struct list_head blkg_list;
Tejun Heo4eef3042012-03-05 13:15:18 -0800543#endif
Tejun Heoa612fdd2011-12-14 00:33:41 +0100544
Martin K. Petersen025146e2009-05-22 17:17:51 -0400545 struct queue_limits limits;
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 /*
548 * sg stuff
549 */
550 unsigned int sg_timeout;
551 unsigned int sg_reserved_size;
Christoph Lameter19460892005-06-23 00:08:19 -0700552 int node;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700553#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +0100554 struct blk_trace *blk_trace;
Waiman Long5acb3cc2017-09-20 13:12:20 -0600555 struct mutex blk_trace_mutex;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700556#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 /*
Tejun Heo4913efe2010-09-03 11:56:16 +0200558 * for flush operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 */
Ming Lei7c94e1c2014-09-25 23:23:43 +0800560 struct blk_flush_queue *fq;
Al Viro483f4af2006-03-18 18:34:37 -0500561
Christoph Hellwig6fca6a62014-05-28 08:08:02 -0600562 struct list_head requeue_list;
563 spinlock_t requeue_lock;
Mike Snitzer28494502016-09-14 13:28:30 -0400564 struct delayed_work requeue_work;
Christoph Hellwig6fca6a62014-05-28 08:08:02 -0600565
Al Viro483f4af2006-03-18 18:34:37 -0500566 struct mutex sysfs_lock;
FUJITA Tomonorid351af02007-07-09 12:40:35 +0200567
Tejun Heod7325802012-03-05 13:14:58 -0800568 int bypass_depth;
Christoph Hellwig4ecd4fe2015-05-07 09:38:13 +0200569 atomic_t mq_freeze_depth;
Tejun Heod7325802012-03-05 13:14:58 -0800570
FUJITA Tomonorid351af02007-07-09 12:40:35 +0200571#if defined(CONFIG_BLK_DEV_BSG)
Mike Christieaa387cc2011-07-31 22:05:09 +0200572 bsg_job_fn *bsg_job_fn;
FUJITA Tomonorid351af02007-07-09 12:40:35 +0200573 struct bsg_class_device bsg_dev;
574#endif
Vivek Goyale43473b2010-09-15 17:06:35 -0400575
576#ifdef CONFIG_BLK_DEV_THROTTLING
577 /* Throttle data */
578 struct throtl_data *td;
579#endif
Tejun Heo548bc8e2013-01-09 08:05:13 -0800580 struct rcu_head rcu_head;
Jens Axboe320ae512013-10-24 09:20:05 +0100581 wait_queue_head_t mq_freeze_wq;
Dan Williams3ef28e82015-10-21 13:20:12 -0400582 struct percpu_ref q_usage_counter;
Jens Axboe320ae512013-10-24 09:20:05 +0100583 struct list_head all_q_node;
Jens Axboe0d2602c2014-05-13 15:10:52 -0600584
585 struct blk_mq_tag_set *tag_set;
586 struct list_head tag_set_list;
Kent Overstreet54efd502015-04-23 22:37:18 -0700587 struct bio_set *bio_split;
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900588
Omar Sandoval03796c12017-01-31 14:53:18 -0800589#ifdef CONFIG_BLK_DEBUG_FS
Omar Sandoval07e4fea2017-01-25 08:06:40 -0800590 struct dentry *debugfs_dir;
Omar Sandovald332ce02017-05-04 08:24:40 -0600591 struct dentry *sched_debugfs_dir;
Omar Sandoval07e4fea2017-01-25 08:06:40 -0800592#endif
593
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900594 bool mq_sysfs_init_done;
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700595
596 size_t cmd_size;
597 void *rq_alloc_data;
Bart Van Asschedc9edc42017-06-14 13:27:50 -0600598
599 struct work_struct release_work;
Jens Axboef793dfd2017-06-26 08:15:27 -0600600
601#define BLK_MAX_WRITE_HINTS 5
602 u64 write_hints[BLK_MAX_WRITE_HINTS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603};
604
Jens Axboee743eb12017-08-10 08:25:38 -0600605#define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */
606#define QUEUE_FLAG_STOPPED 1 /* queue is stopped */
607#define QUEUE_FLAG_DYING 2 /* queue being torn down */
608#define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */
609#define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */
610#define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */
611#define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */
612#define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */
613#define QUEUE_FLAG_STACKABLE 8 /* supports request stacking */
614#define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */
Fernando Luis Vázquez Cao88e740f2008-10-27 18:44:46 +0900615#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
Jens Axboee743eb12017-08-10 08:25:38 -0600616#define QUEUE_FLAG_IO_STAT 10 /* do IO stats */
617#define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */
618#define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */
619#define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */
620#define QUEUE_FLAG_SECERASE 14 /* supports secure erase */
621#define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */
622#define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */
623#define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */
624#define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/
625#define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */
626#define QUEUE_FLAG_WC 20 /* Write back caching */
627#define QUEUE_FLAG_FUA 21 /* device supports FUA writes */
628#define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */
629#define QUEUE_FLAG_DAX 23 /* device supports DAX */
630#define QUEUE_FLAG_STATS 24 /* track rq completion times */
631#define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */
632#define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */
633#define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */
634#define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
Jens Axboebc58ba92009-01-23 10:54:44 +0100635
636#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
Jens Axboe01e97f62009-09-03 20:06:47 +0200637 (1 << QUEUE_FLAG_STACKABLE) | \
Jens Axboee2e1a142010-06-09 10:42:09 +0200638 (1 << QUEUE_FLAG_SAME_COMP) | \
639 (1 << QUEUE_FLAG_ADD_RANDOM))
Tejun Heo797e7db2006-01-06 09:51:03 +0100640
Jens Axboe94eddfb2013-11-19 09:25:07 -0700641#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
Mike Snitzerad9cf3b2014-12-16 12:54:25 -0500642 (1 << QUEUE_FLAG_STACKABLE) | \
Christoph Hellwig8e0b60b2016-03-03 16:04:03 +0100643 (1 << QUEUE_FLAG_SAME_COMP) | \
644 (1 << QUEUE_FLAG_POLL))
Jens Axboe94eddfb2013-11-19 09:25:07 -0700645
Bart Van Assche9e0c8292017-06-20 11:15:44 -0700646/*
647 * @q->queue_lock is set while a queue is being initialized. Since we know
648 * that no other threads access the queue object before @q->queue_lock has
649 * been set, it is safe to manipulate queue flags without holding the
650 * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and
651 * blk_init_allocated_queue().
652 */
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200653static inline void queue_lockdep_assert_held(struct request_queue *q)
Linus Torvalds8f45c1a2008-04-29 10:16:38 -0700654{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200655 if (q->queue_lock)
656 lockdep_assert_held(q->queue_lock);
Linus Torvalds8f45c1a2008-04-29 10:16:38 -0700657}
658
Nick Piggin75ad23b2008-04-29 14:48:33 +0200659static inline void queue_flag_set_unlocked(unsigned int flag,
660 struct request_queue *q)
661{
662 __set_bit(flag, &q->queue_flags);
663}
664
Jens Axboee48ec692008-07-03 13:18:54 +0200665static inline int queue_flag_test_and_clear(unsigned int flag,
666 struct request_queue *q)
667{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200668 queue_lockdep_assert_held(q);
Jens Axboee48ec692008-07-03 13:18:54 +0200669
670 if (test_bit(flag, &q->queue_flags)) {
671 __clear_bit(flag, &q->queue_flags);
672 return 1;
673 }
674
675 return 0;
676}
677
678static inline int queue_flag_test_and_set(unsigned int flag,
679 struct request_queue *q)
680{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200681 queue_lockdep_assert_held(q);
Jens Axboee48ec692008-07-03 13:18:54 +0200682
683 if (!test_bit(flag, &q->queue_flags)) {
684 __set_bit(flag, &q->queue_flags);
685 return 0;
686 }
687
688 return 1;
689}
690
Nick Piggin75ad23b2008-04-29 14:48:33 +0200691static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
692{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200693 queue_lockdep_assert_held(q);
Nick Piggin75ad23b2008-04-29 14:48:33 +0200694 __set_bit(flag, &q->queue_flags);
695}
696
697static inline void queue_flag_clear_unlocked(unsigned int flag,
698 struct request_queue *q)
699{
700 __clear_bit(flag, &q->queue_flags);
701}
702
Jens Axboe0a7ae2f2009-05-20 08:54:31 +0200703static inline int queue_in_flight(struct request_queue *q)
704{
705 return q->in_flight[0] + q->in_flight[1];
706}
707
Nick Piggin75ad23b2008-04-29 14:48:33 +0200708static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
709{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200710 queue_lockdep_assert_held(q);
Nick Piggin75ad23b2008-04-29 14:48:33 +0200711 __clear_bit(flag, &q->queue_flags);
712}
713
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
715#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100716#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
Bart Van Asschec246e802012-12-06 14:32:01 +0100717#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
Tejun Heod7325802012-03-05 13:14:58 -0800718#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
Jens Axboe320ae512013-10-24 09:20:05 +0100719#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200720#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100721#define blk_queue_noxmerges(q) \
722 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
Jens Axboea68bbddba2008-09-24 13:03:33 +0200723#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
Jens Axboebc58ba92009-01-23 10:54:44 +0100724#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
Jens Axboee2e1a142010-06-09 10:42:09 +0200725#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
Kiyoshi Ueda4ee5eaf2008-09-18 10:46:13 -0400726#define blk_queue_stackable(q) \
727 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
Christoph Hellwigc15227d2009-09-30 13:52:12 +0200728#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
Christoph Hellwig288dab82016-06-09 16:00:36 +0200729#define blk_queue_secure_erase(q) \
730 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
Toshi Kani163d4ba2016-06-23 17:05:50 -0400731#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
Bart Van Assche9efc1602017-05-31 14:43:46 -0700732#define blk_queue_scsi_passthrough(q) \
733 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200735#define blk_noretry_request(rq) \
736 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
737 REQ_FAILFAST_DRIVER))
Ming Leif4560ff2017-06-18 14:24:27 -0600738#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
Jens Axboe4aff5e22006-08-10 08:44:47 +0200739
Christoph Hellwig57292b52017-01-31 16:57:29 +0100740static inline bool blk_account_rq(struct request *rq)
741{
742 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
743}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Jens Axboeab780f12008-08-26 10:25:02 +0200745#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
FUJITA Tomonoriabae1fd2007-07-16 08:52:14 +0200746#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
Kiyoshi Ueda336cdb42007-12-11 17:40:30 -0500747/* rq->queuelist of dequeued request must be list_empty() */
748#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
751
Mike Christie4e1b2d522016-06-05 14:32:22 -0500752#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Jens Axboe49fd5242014-04-16 10:57:18 -0600754/*
755 * Driver can handle struct request, if it either has an old style
756 * request_fn defined, or is blk-mq based.
757 */
758static inline bool queue_is_rq_based(struct request_queue *q)
759{
760 return q->request_fn || q->mq_ops;
761}
762
Martin K. Petersene692cb62010-12-01 19:41:49 +0100763static inline unsigned int blk_queue_cluster(struct request_queue *q)
764{
765 return q->limits.cluster;
766}
767
Damien Le Moal797476b2016-10-18 15:40:29 +0900768static inline enum blk_zoned_model
769blk_queue_zoned_model(struct request_queue *q)
770{
771 return q->limits.zoned;
772}
773
774static inline bool blk_queue_is_zoned(struct request_queue *q)
775{
776 switch (blk_queue_zoned_model(q)) {
777 case BLK_ZONED_HA:
778 case BLK_ZONED_HM:
779 return true;
780 default:
781 return false;
782 }
783}
784
Damien Le Moalf99e8642017-01-12 07:58:32 -0700785static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +0900786{
787 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
788}
789
Jens Axboe1faa16d2009-04-06 14:48:01 +0200790static inline bool rq_is_sync(struct request *rq)
791{
Christoph Hellwigef295ec2016-10-28 08:48:16 -0600792 return op_is_sync(rq->cmd_flags);
Jens Axboe1faa16d2009-04-06 14:48:01 +0200793}
794
Tejun Heo5b788ce2012-06-04 20:40:59 -0700795static inline bool blk_rl_full(struct request_list *rl, bool sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
Tejun Heo5b788ce2012-06-04 20:40:59 -0700797 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
798
799 return rl->flags & flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
801
Tejun Heo5b788ce2012-06-04 20:40:59 -0700802static inline void blk_set_rl_full(struct request_list *rl, bool sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Tejun Heo5b788ce2012-06-04 20:40:59 -0700804 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
805
806 rl->flags |= flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807}
808
Tejun Heo5b788ce2012-06-04 20:40:59 -0700809static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810{
Tejun Heo5b788ce2012-06-04 20:40:59 -0700811 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
812
813 rl->flags &= ~flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400816static inline bool rq_mergeable(struct request *rq)
817{
Christoph Hellwig57292b52017-01-31 16:57:29 +0100818 if (blk_rq_is_passthrough(rq))
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400819 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Mike Christie3a5e02c2016-06-05 14:32:23 -0500821 if (req_op(rq) == REQ_OP_FLUSH)
822 return false;
823
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800824 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
825 return false;
826
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400827 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
828 return false;
Christoph Hellwige8064022016-10-20 15:12:13 +0200829 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
830 return false;
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400831
832 return true;
833}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400835static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
836{
Christoph Hellwigefbeccd2017-06-19 09:24:41 +0200837 if (bio_page(a) == bio_page(b) &&
838 bio_offset(a) == bio_offset(b))
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400839 return true;
840
841 return false;
842}
843
Jens Axboed278d4a2016-03-30 10:21:08 -0600844static inline unsigned int blk_queue_depth(struct request_queue *q)
845{
846 if (q->queue_depth)
847 return q->queue_depth;
848
849 return q->nr_requests;
850}
851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 * q->prep_rq_fn return values
854 */
Martin K. Petersen0fb5b1f2016-02-04 00:52:12 -0500855enum {
856 BLKPREP_OK, /* serve it */
857 BLKPREP_KILL, /* fatal error, kill, return -EIO */
858 BLKPREP_DEFER, /* leave on queue */
859 BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
860};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862extern unsigned long blk_max_low_pfn, blk_max_pfn;
863
864/*
865 * standard bounce addresses:
866 *
867 * BLK_BOUNCE_HIGH : bounce all highmem pages
868 * BLK_BOUNCE_ANY : don't bounce anything
869 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
870 */
Andi Kleen24728922008-04-21 09:51:05 +0200871
872#if BITS_PER_LONG == 32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
Andi Kleen24728922008-04-21 09:51:05 +0200874#else
875#define BLK_BOUNCE_HIGH -1ULL
876#endif
877#define BLK_BOUNCE_ANY (-1ULL)
FUJITA Tomonoribfe17232010-05-31 15:59:03 +0900878#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Jens Axboe3d6392c2007-07-09 12:38:05 +0200880/*
881 * default timeout for SG_IO if none specified
882 */
883#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
Linus Torvaldsf2f1fa72008-12-05 14:49:18 -0800884#define BLK_MIN_SG_TIMEOUT (7 * HZ)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200885
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900886struct rq_map_data {
887 struct page **pages;
888 int page_order;
889 int nr_entries;
FUJITA Tomonori56c451f2008-12-18 14:49:37 +0900890 unsigned long offset;
FUJITA Tomonori97ae77a2008-12-18 14:49:38 +0900891 int null_mapped;
FUJITA Tomonoriecb554a2009-07-09 14:46:53 +0200892 int from_user;
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900893};
894
NeilBrown5705f702007-09-25 12:35:59 +0200895struct req_iterator {
Kent Overstreet79886132013-11-23 17:19:00 -0800896 struct bvec_iter iter;
NeilBrown5705f702007-09-25 12:35:59 +0200897 struct bio *bio;
898};
899
900/* This should not be used directly - use rq_for_each_segment */
Jens Axboe1e428072009-02-23 09:03:10 +0100901#define for_each_bio(_bio) \
902 for (; _bio; _bio = _bio->bi_next)
NeilBrown5705f702007-09-25 12:35:59 +0200903#define __rq_for_each_bio(_bio, rq) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if ((rq->bio)) \
905 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
906
NeilBrown5705f702007-09-25 12:35:59 +0200907#define rq_for_each_segment(bvl, _rq, _iter) \
908 __rq_for_each_bio(_iter.bio, _rq) \
Kent Overstreet79886132013-11-23 17:19:00 -0800909 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
NeilBrown5705f702007-09-25 12:35:59 +0200910
Kent Overstreet4550dd62013-08-07 14:26:21 -0700911#define rq_iter_last(bvec, _iter) \
Kent Overstreet79886132013-11-23 17:19:00 -0800912 (_iter.bio->bi_next == NULL && \
Kent Overstreet4550dd62013-08-07 14:26:21 -0700913 bio_iter_last(bvec, _iter.iter))
NeilBrown5705f702007-09-25 12:35:59 +0200914
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100915#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
916# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
917#endif
918#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
919extern void rq_flush_dcache_pages(struct request *rq);
920#else
921static inline void rq_flush_dcache_pages(struct request *rq)
922{
923}
924#endif
925
Toshi Kani2af3a812016-05-10 10:23:52 -0600926#ifdef CONFIG_PRINTK
927#define vfs_msg(sb, level, fmt, ...) \
928 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
929#else
930#define vfs_msg(sb, level, fmt, ...) \
931do { \
932 no_printk(fmt, ##__VA_ARGS__); \
933 __vfs_msg(sb, "", " "); \
934} while (0)
935#endif
936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937extern int blk_register_queue(struct gendisk *disk);
938extern void blk_unregister_queue(struct gendisk *disk);
Jens Axboedece1632015-11-05 10:41:16 -0700939extern blk_qc_t generic_make_request(struct bio *bio);
FUJITA Tomonori2a4aa302008-04-29 09:54:36 +0200940extern void blk_rq_init(struct request_queue *q, struct request *rq);
Bart Van Asscheda8d7f02017-04-19 14:01:24 -0700941extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942extern void blk_put_request(struct request *);
Jens Axboe165125e2007-07-24 09:28:11 +0200943extern void __blk_put_request(struct request_queue *, struct request *);
Bart Van Asschecd6ce142017-06-20 11:15:39 -0700944extern struct request *blk_get_request(struct request_queue *, unsigned int op,
945 gfp_t gfp_mask);
Jens Axboe165125e2007-07-24 09:28:11 +0200946extern void blk_requeue_request(struct request_queue *, struct request *);
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +0200947extern int blk_lld_busy(struct request_queue *q);
Mike Snitzer78d8e582015-06-26 10:01:13 -0400948extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
949 struct bio_set *bs, gfp_t gfp_mask,
950 int (*bio_ctr)(struct bio *, struct bio *, void *),
951 void *data);
952extern void blk_rq_unprep_clone(struct request *rq);
Christoph Hellwig2a842ac2017-06-03 09:38:04 +0200953extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
Kiyoshi Ueda82124d62008-09-18 10:45:38 -0400954 struct request *rq);
Christoph Hellwig98d61d52016-07-19 11:31:51 +0200955extern int blk_rq_append_bio(struct request *rq, struct bio *bio);
Jens Axboe3cca6dc2011-03-02 11:08:00 -0500956extern void blk_delay_queue(struct request_queue *, unsigned long);
NeilBrownaf67c312017-06-18 14:38:57 +1000957extern void blk_queue_split(struct request_queue *, struct bio **);
Jens Axboe165125e2007-07-24 09:28:11 +0200958extern void blk_recount_segments(struct request_queue *, struct bio *);
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100959extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100960extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
961 unsigned int, void __user *);
Al Viro74f3c8a2007-08-27 15:38:10 -0400962extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
963 unsigned int, void __user *);
Al Viroe915e872008-09-02 17:16:41 -0400964extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
965 struct scsi_ioctl_command __user *);
Andrew Morton3fcfab12006-10-19 23:28:16 -0700966
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100967extern int blk_queue_enter(struct request_queue *q, bool nowait);
Dan Williams2e6edc952015-11-19 13:29:28 -0800968extern void blk_queue_exit(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200969extern void blk_start_queue(struct request_queue *q);
Jens Axboe21491412015-12-28 13:01:22 -0700970extern void blk_start_queue_async(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200971extern void blk_stop_queue(struct request_queue *q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972extern void blk_sync_queue(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200973extern void __blk_stop_queue(struct request_queue *q);
Christoph Hellwig24ecfbe2011-04-18 11:41:33 +0200974extern void __blk_run_queue(struct request_queue *q);
Christoph Hellwiga7928c152015-04-17 22:37:20 +0200975extern void __blk_run_queue_uncond(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200976extern void blk_run_queue(struct request_queue *);
Jens Axboec21e6be2011-04-19 13:32:46 +0200977extern void blk_run_queue_async(struct request_queue *q);
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900978extern int blk_rq_map_user(struct request_queue *, struct request *,
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900979 struct rq_map_data *, void __user *, unsigned long,
980 gfp_t);
Jens Axboe8e5cfc42006-12-19 11:12:46 +0100981extern int blk_rq_unmap_user(struct bio *);
Jens Axboe165125e2007-07-24 09:28:11 +0200982extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
983extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
Kent Overstreet26e49cf2015-01-18 16:16:31 +0100984 struct rq_map_data *, const struct iov_iter *,
985 gfp_t);
Christoph Hellwigb7819b92017-04-20 16:02:55 +0200986extern void blk_execute_rq(struct request_queue *, struct gendisk *,
James Bottomley 994ca9a2005-06-20 14:11:09 +0200987 struct request *, int);
Jens Axboe165125e2007-07-24 09:28:11 +0200988extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
Jens Axboe15fc8582006-01-06 10:00:50 +0100989 struct request *, int, rq_end_io_fn *);
Mike Christie6e39b69e2005-11-11 05:30:24 -0600990
Christoph Hellwig2a842ac2017-06-03 09:38:04 +0200991int blk_status_to_errno(blk_status_t status);
992blk_status_t errno_to_blk_status(int errno);
993
Jens Axboebbd7bb72016-11-04 09:34:34 -0600994bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
Jens Axboe05229beed2015-11-05 10:44:55 -0700995
Jens Axboe165125e2007-07-24 09:28:11 +0200996static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997{
Tejun Heoff9ea322014-09-08 08:03:56 +0900998 return bdev->bd_disk->queue; /* this is never NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999}
1000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001/*
Tejun Heo80a761f2009-07-03 17:48:17 +09001002 * blk_rq_pos() : the current sector
1003 * blk_rq_bytes() : bytes left in the entire request
1004 * blk_rq_cur_bytes() : bytes left in the current segment
1005 * blk_rq_err_bytes() : bytes left till the next error boundary
1006 * blk_rq_sectors() : sectors left in the entire request
1007 * blk_rq_cur_sectors() : sectors left in the current segment
Tejun Heo5efccd12009-04-23 11:05:18 +09001008 */
Tejun Heo5b936292009-05-07 22:24:38 +09001009static inline sector_t blk_rq_pos(const struct request *rq)
1010{
Tejun Heoa2dec7b2009-05-07 22:24:44 +09001011 return rq->__sector;
Tejun Heo5b936292009-05-07 22:24:38 +09001012}
1013
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001014static inline unsigned int blk_rq_bytes(const struct request *rq)
1015{
Tejun Heoa2dec7b2009-05-07 22:24:44 +09001016 return rq->__data_len;
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001017}
1018
1019static inline int blk_rq_cur_bytes(const struct request *rq)
1020{
1021 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1022}
Tejun Heo5efccd12009-04-23 11:05:18 +09001023
Tejun Heo80a761f2009-07-03 17:48:17 +09001024extern unsigned int blk_rq_err_bytes(const struct request *rq);
1025
Tejun Heo5b936292009-05-07 22:24:38 +09001026static inline unsigned int blk_rq_sectors(const struct request *rq)
1027{
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001028 return blk_rq_bytes(rq) >> 9;
Tejun Heo5b936292009-05-07 22:24:38 +09001029}
1030
1031static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1032{
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001033 return blk_rq_cur_bytes(rq) >> 9;
Tejun Heo5b936292009-05-07 22:24:38 +09001034}
1035
Christoph Hellwig2e3258e2017-01-13 12:29:10 +01001036/*
1037 * Some commands like WRITE SAME have a payload or data transfer size which
1038 * is different from the size of the request. Any driver that supports such
1039 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1040 * calculate the data transfer size.
1041 */
1042static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1043{
1044 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1045 return rq->special_vec.bv_len;
1046 return blk_rq_bytes(rq);
1047}
1048
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001049static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
Mike Christie8fe0d472016-06-05 14:32:15 -05001050 int op)
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001051{
Adrian Hunter7afafc82016-08-16 10:59:35 +03001052 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
James Bottomley871dd922013-04-24 08:52:50 -06001053 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001054
Mike Christie8fe0d472016-06-05 14:32:15 -05001055 if (unlikely(op == REQ_OP_WRITE_SAME))
Martin K. Petersen4363ac72012-09-18 12:19:27 -04001056 return q->limits.max_write_same_sectors;
1057
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -08001058 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1059 return q->limits.max_write_zeroes_sectors;
1060
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001061 return q->limits.max_sectors;
1062}
1063
Jens Axboe762380a2014-06-05 13:38:39 -06001064/*
1065 * Return maximum size of a request at given offset. Only valid for
1066 * file system requests.
1067 */
1068static inline unsigned int blk_max_size_offset(struct request_queue *q,
1069 sector_t offset)
1070{
1071 if (!q->limits.chunk_sectors)
Jens Axboe736ed4d2014-06-17 22:09:29 -07001072 return q->limits.max_sectors;
Jens Axboe762380a2014-06-05 13:38:39 -06001073
1074 return q->limits.chunk_sectors -
1075 (offset & (q->limits.chunk_sectors - 1));
1076}
1077
Damien Le Moal17007f32016-07-20 21:40:47 -06001078static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1079 sector_t offset)
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001080{
1081 struct request_queue *q = rq->q;
1082
Christoph Hellwig57292b52017-01-31 16:57:29 +01001083 if (blk_rq_is_passthrough(rq))
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001084 return q->limits.max_hw_sectors;
1085
Adrian Hunter7afafc82016-08-16 10:59:35 +03001086 if (!q->limits.chunk_sectors ||
1087 req_op(rq) == REQ_OP_DISCARD ||
1088 req_op(rq) == REQ_OP_SECURE_ERASE)
Mike Christie8fe0d472016-06-05 14:32:15 -05001089 return blk_queue_get_max_sectors(q, req_op(rq));
Jens Axboe762380a2014-06-05 13:38:39 -06001090
Damien Le Moal17007f32016-07-20 21:40:47 -06001091 return min(blk_max_size_offset(q, offset),
Mike Christie8fe0d472016-06-05 14:32:15 -05001092 blk_queue_get_max_sectors(q, req_op(rq)));
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001093}
1094
Jun'ichi Nomura75afb352013-09-21 13:57:47 -06001095static inline unsigned int blk_rq_count_bios(struct request *rq)
1096{
1097 unsigned int nr_bios = 0;
1098 struct bio *bio;
1099
1100 __rq_for_each_bio(bio, rq)
1101 nr_bios++;
1102
1103 return nr_bios;
1104}
1105
Tejun Heo5efccd12009-04-23 11:05:18 +09001106/*
Tejun Heo9934c8c2009-05-08 11:54:16 +09001107 * Request issue related functions.
1108 */
1109extern struct request *blk_peek_request(struct request_queue *q);
1110extern void blk_start_request(struct request *rq);
1111extern struct request *blk_fetch_request(struct request_queue *q);
1112
1113/*
Tejun Heo2e60e022009-04-23 11:05:18 +09001114 * Request completion related functions.
1115 *
1116 * blk_update_request() completes given number of bytes and updates
1117 * the request without completing it.
1118 *
Tejun Heof06d9a22009-04-23 11:05:19 +09001119 * blk_end_request() and friends. __blk_end_request() must be called
1120 * with the request queue spinlock acquired.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 *
1122 * Several drivers define their own end_request and call
Kiyoshi Ueda3bcddea2007-12-11 17:52:28 -05001123 * blk_end_request() for parts of the original function.
1124 * This prevents code duplication in drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 */
Christoph Hellwig2a842ac2017-06-03 09:38:04 +02001126extern bool blk_update_request(struct request *rq, blk_status_t error,
Tejun Heo2e60e022009-04-23 11:05:18 +09001127 unsigned int nr_bytes);
Christoph Hellwig2a842ac2017-06-03 09:38:04 +02001128extern void blk_finish_request(struct request *rq, blk_status_t error);
1129extern bool blk_end_request(struct request *rq, blk_status_t error,
FUJITA Tomonorib1f74492009-05-11 17:56:09 +09001130 unsigned int nr_bytes);
Christoph Hellwig2a842ac2017-06-03 09:38:04 +02001131extern void blk_end_request_all(struct request *rq, blk_status_t error);
1132extern bool __blk_end_request(struct request *rq, blk_status_t error,
FUJITA Tomonorib1f74492009-05-11 17:56:09 +09001133 unsigned int nr_bytes);
Christoph Hellwig2a842ac2017-06-03 09:38:04 +02001134extern void __blk_end_request_all(struct request *rq, blk_status_t error);
1135extern bool __blk_end_request_cur(struct request *rq, blk_status_t error);
Tejun Heo2e60e022009-04-23 11:05:18 +09001136
Jens Axboeff856ba2006-01-09 16:02:34 +01001137extern void blk_complete_request(struct request *);
Jens Axboe242f9dc2008-09-14 05:55:09 -07001138extern void __blk_complete_request(struct request *);
1139extern void blk_abort_request(struct request *);
James Bottomley28018c22010-07-01 19:49:17 +09001140extern void blk_unprep_request(struct request *);
Jens Axboeff856ba2006-01-09 16:02:34 +01001141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 * Access functions for manipulating queue properties
1144 */
Jens Axboe165125e2007-07-24 09:28:11 +02001145extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
Christoph Lameter19460892005-06-23 00:08:19 -07001146 spinlock_t *lock, int node_id);
Jens Axboe165125e2007-07-24 09:28:11 +02001147extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
Christoph Hellwig5ea708d2017-01-03 14:52:44 +03001148extern int blk_init_allocated_queue(struct request_queue *);
Jens Axboe165125e2007-07-24 09:28:11 +02001149extern void blk_cleanup_queue(struct request_queue *);
1150extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1151extern void blk_queue_bounce_limit(struct request_queue *, u64);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -05001152extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
Jens Axboe762380a2014-06-05 13:38:39 -06001153extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
Martin K. Petersen8a783622010-02-26 00:20:39 -05001154extern void blk_queue_max_segments(struct request_queue *, unsigned short);
Christoph Hellwig1e739732017-02-08 14:46:49 +01001155extern void blk_queue_max_discard_segments(struct request_queue *,
1156 unsigned short);
Jens Axboe165125e2007-07-24 09:28:11 +02001157extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
Christoph Hellwig67efc922009-09-30 13:54:20 +02001158extern void blk_queue_max_discard_sectors(struct request_queue *q,
1159 unsigned int max_discard_sectors);
Martin K. Petersen4363ac72012-09-18 12:19:27 -04001160extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1161 unsigned int max_write_same_sectors);
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -08001162extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1163 unsigned int max_write_same_sectors);
Martin K. Petersene1defc42009-05-22 17:17:49 -04001164extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
Martin K. Petersen892b6f92010-10-13 21:18:03 +02001165extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001166extern void blk_queue_alignment_offset(struct request_queue *q,
1167 unsigned int alignment);
Martin K. Petersen7c958e32009-07-31 11:49:11 -04001168extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001169extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
Martin K. Petersen3c5820c2009-09-11 21:54:52 +02001170extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001171extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
Jens Axboed278d4a2016-03-30 10:21:08 -06001172extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
Martin K. Petersene475bba2009-06-16 08:23:52 +02001173extern void blk_set_default_limits(struct queue_limits *lim);
Martin K. Petersenb1bd0552012-01-11 16:27:11 +01001174extern void blk_set_stacking_limits(struct queue_limits *lim);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001175extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1176 sector_t offset);
Martin K. Petersen17be8c22010-01-11 03:21:49 -05001177extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1178 sector_t offset);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001179extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1180 sector_t offset);
Jens Axboe165125e2007-07-24 09:28:11 +02001181extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
Tejun Heoe3790c72008-03-04 11:18:17 +01001182extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
FUJITA Tomonori27f82212008-07-04 09:30:03 +02001183extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
Tejun Heo2fb98e82008-02-19 11:36:53 +01001184extern int blk_queue_dma_drain(struct request_queue *q,
1185 dma_drain_needed_fn *dma_drain_needed,
1186 void *buf, unsigned int size);
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +02001187extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
Jens Axboe165125e2007-07-24 09:28:11 +02001188extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
Keith Busch03100aa2015-08-19 14:24:05 -07001189extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
Jens Axboe165125e2007-07-24 09:28:11 +02001190extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
James Bottomley28018c22010-07-01 19:49:17 +09001191extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
Jens Axboe165125e2007-07-24 09:28:11 +02001192extern void blk_queue_dma_alignment(struct request_queue *, int);
James Bottomley11c3e682007-12-31 16:37:00 -06001193extern void blk_queue_update_dma_alignment(struct request_queue *, int);
Jens Axboe165125e2007-07-24 09:28:11 +02001194extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
Jens Axboe242f9dc2008-09-14 05:55:09 -07001195extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1196extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
shaohua.li@intel.comf3876932011-05-06 11:34:32 -06001197extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
Jens Axboe93e9d8e2016-04-12 12:32:46 -06001198extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
Christoph Hellwig1e739732017-02-08 14:46:49 +01001200/*
1201 * Number of physical segments as sent to the device.
1202 *
1203 * Normally this is the number of discontiguous data segments sent by the
1204 * submitter. But for data-less command like discard we might have no
1205 * actual data segments submitted, but the driver might have to add it's
1206 * own special payload. In that case we still return 1 here so that this
1207 * special payload will be mapped.
1208 */
Christoph Hellwigf9d03f92016-12-08 15:20:32 -07001209static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1210{
1211 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1212 return 1;
1213 return rq->nr_phys_segments;
1214}
1215
Christoph Hellwig1e739732017-02-08 14:46:49 +01001216/*
1217 * Number of discard segments (or ranges) the driver needs to fill in.
1218 * Each discard bio merged into a request is counted as one segment.
1219 */
1220static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1221{
1222 return max_t(unsigned short, rq->nr_phys_segments, 1);
1223}
1224
Jens Axboe165125e2007-07-24 09:28:11 +02001225extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226extern void blk_dump_rq_flags(struct request *, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227extern long nr_blockdev_pages(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
Tejun Heo09ac46c2011-12-14 00:33:38 +01001229bool __must_check blk_get_queue(struct request_queue *);
Jens Axboe165125e2007-07-24 09:28:11 +02001230struct request_queue *blk_alloc_queue(gfp_t);
1231struct request_queue *blk_alloc_queue_node(gfp_t, int);
1232extern void blk_put_queue(struct request_queue *);
Jens Axboe3f21c262015-06-05 10:57:37 -06001233extern void blk_set_queue_dying(struct request_queue *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
Shaohua Li316cc672011-07-08 08:19:21 +02001235/*
Lin Ming6c954662013-03-23 11:42:26 +08001236 * block layer runtime pm functions
1237 */
Rafael J. Wysocki47fafbc2014-12-04 01:00:23 +01001238#ifdef CONFIG_PM
Lin Ming6c954662013-03-23 11:42:26 +08001239extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1240extern int blk_pre_runtime_suspend(struct request_queue *q);
1241extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1242extern void blk_pre_runtime_resume(struct request_queue *q);
1243extern void blk_post_runtime_resume(struct request_queue *q, int err);
Mika Westerbergd07ab6d2016-02-18 10:54:11 +02001244extern void blk_set_runtime_active(struct request_queue *q);
Lin Ming6c954662013-03-23 11:42:26 +08001245#else
1246static inline void blk_pm_runtime_init(struct request_queue *q,
1247 struct device *dev) {}
1248static inline int blk_pre_runtime_suspend(struct request_queue *q)
1249{
1250 return -ENOSYS;
1251}
1252static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1253static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1254static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
Tobias Klauser9a05e752016-11-18 15:16:06 +01001255static inline void blk_set_runtime_active(struct request_queue *q) {}
Lin Ming6c954662013-03-23 11:42:26 +08001256#endif
1257
1258/*
Suresh Jayaraman75df7132011-09-21 10:00:16 +02001259 * blk_plug permits building a queue of related requests by holding the I/O
1260 * fragments for a short period. This allows merging of sequential requests
1261 * into single larger request. As the requests are moved from a per-task list to
1262 * the device's request_queue in a batch, this results in improved scalability
1263 * as the lock contention for request_queue lock is reduced.
1264 *
1265 * It is ok not to disable preemption when adding the request to the plug list
1266 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1267 * the plug list when the task sleeps by itself. For details, please see
1268 * schedule() where blk_schedule_flush_plug() is called.
Shaohua Li316cc672011-07-08 08:19:21 +02001269 */
Jens Axboe73c10102011-03-08 13:19:51 +01001270struct blk_plug {
Suresh Jayaraman75df7132011-09-21 10:00:16 +02001271 struct list_head list; /* requests */
Jens Axboe320ae512013-10-24 09:20:05 +01001272 struct list_head mq_list; /* blk-mq requests */
Suresh Jayaraman75df7132011-09-21 10:00:16 +02001273 struct list_head cb_list; /* md requires an unplug callback */
Jens Axboe73c10102011-03-08 13:19:51 +01001274};
Shaohua Li55c022b2011-07-08 08:19:20 +02001275#define BLK_MAX_REQUEST_COUNT 16
Shaohua Li50d24c32016-11-03 17:03:53 -07001276#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
Shaohua Li55c022b2011-07-08 08:19:20 +02001277
NeilBrown9cbb1752012-07-31 09:08:14 +02001278struct blk_plug_cb;
NeilBrown74018dc2012-07-31 09:08:15 +02001279typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
NeilBrown048c9372011-04-18 09:52:22 +02001280struct blk_plug_cb {
1281 struct list_head list;
NeilBrown9cbb1752012-07-31 09:08:14 +02001282 blk_plug_cb_fn callback;
1283 void *data;
NeilBrown048c9372011-04-18 09:52:22 +02001284};
NeilBrown9cbb1752012-07-31 09:08:14 +02001285extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1286 void *data, int size);
Jens Axboe73c10102011-03-08 13:19:51 +01001287extern void blk_start_plug(struct blk_plug *);
1288extern void blk_finish_plug(struct blk_plug *);
Jens Axboef6603782011-04-15 15:49:07 +02001289extern void blk_flush_plug_list(struct blk_plug *, bool);
Jens Axboe73c10102011-03-08 13:19:51 +01001290
1291static inline void blk_flush_plug(struct task_struct *tsk)
1292{
1293 struct blk_plug *plug = tsk->plug;
1294
Christoph Hellwig88b996c2011-04-15 15:20:10 +02001295 if (plug)
Jens Axboea237c1c2011-04-16 13:27:55 +02001296 blk_flush_plug_list(plug, false);
1297}
1298
1299static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1300{
1301 struct blk_plug *plug = tsk->plug;
1302
1303 if (plug)
Jens Axboef6603782011-04-15 15:49:07 +02001304 blk_flush_plug_list(plug, true);
Jens Axboe73c10102011-03-08 13:19:51 +01001305}
1306
1307static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1308{
1309 struct blk_plug *plug = tsk->plug;
1310
Jens Axboe320ae512013-10-24 09:20:05 +01001311 return plug &&
1312 (!list_empty(&plug->list) ||
1313 !list_empty(&plug->mq_list) ||
1314 !list_empty(&plug->cb_list));
Jens Axboe73c10102011-03-08 13:19:51 +01001315}
1316
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317/*
1318 * tag stuff
1319 */
Jens Axboe165125e2007-07-24 09:28:11 +02001320extern int blk_queue_start_tag(struct request_queue *, struct request *);
1321extern struct request *blk_queue_find_tag(struct request_queue *, int);
1322extern void blk_queue_end_tag(struct request_queue *, struct request *);
Shaohua Liee1b6f72015-01-15 17:32:25 -08001323extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
Jens Axboe165125e2007-07-24 09:28:11 +02001324extern void blk_queue_free_tags(struct request_queue *);
1325extern int blk_queue_resize_tags(struct request_queue *, int);
1326extern void blk_queue_invalidate_tags(struct request_queue *);
Shaohua Liee1b6f72015-01-15 17:32:25 -08001327extern struct blk_queue_tag *blk_init_tags(int, int);
James Bottomley492dfb42006-08-30 15:48:45 -04001328extern void blk_free_tags(struct blk_queue_tag *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
David C Somayajuluf583f492006-10-04 08:27:25 +02001330static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1331 int tag)
1332{
1333 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1334 return NULL;
1335 return bqt->tag_index[tag];
1336}
Christoph Hellwigdd3932e2010-09-16 20:51:46 +02001337
Christoph Hellwigee472d82017-04-05 19:21:08 +02001338extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1339extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1340 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
Christoph Hellwige950fdf2016-07-19 11:23:33 +02001341
1342#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
Christoph Hellwigdd3932e2010-09-16 20:51:46 +02001343
Dmitry Monakhovfbd9b092010-04-28 17:55:06 +04001344extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1345 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
Christoph Hellwig38f25252016-04-16 14:55:28 -04001346extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
Christoph Hellwig288dab82016-06-09 16:00:36 +02001347 sector_t nr_sects, gfp_t gfp_mask, int flags,
Mike Christie469e3212016-06-05 14:31:49 -05001348 struct bio **biop);
Christoph Hellwigee472d82017-04-05 19:21:08 +02001349
1350#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
Christoph Hellwigcb365b92017-04-05 19:21:10 +02001351#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
Christoph Hellwigee472d82017-04-05 19:21:08 +02001352
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -08001353extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1354 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
Christoph Hellwigee472d82017-04-05 19:21:08 +02001355 unsigned flags);
Dmitry Monakhov3f14d792010-04-28 17:55:09 +04001356extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
Christoph Hellwigee472d82017-04-05 19:21:08 +02001357 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1358
Christoph Hellwig2cf6d262010-08-18 05:29:10 -04001359static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1360 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
David Woodhousefb2dce82008-08-05 18:01:53 +01001361{
Christoph Hellwig2cf6d262010-08-18 05:29:10 -04001362 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1363 nr_blocks << (sb->s_blocksize_bits - 9),
1364 gfp_mask, flags);
David Woodhousefb2dce82008-08-05 18:01:53 +01001365}
Lukas Czernere6fa0be2010-10-27 21:30:04 -04001366static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
Theodore Ts'oa107e5a2010-10-27 23:44:47 -04001367 sector_t nr_blocks, gfp_t gfp_mask)
Lukas Czernere6fa0be2010-10-27 21:30:04 -04001368{
1369 return blkdev_issue_zeroout(sb->s_bdev,
1370 block << (sb->s_blocksize_bits - 9),
1371 nr_blocks << (sb->s_blocksize_bits - 9),
Christoph Hellwigee472d82017-04-05 19:21:08 +02001372 gfp_mask, 0);
Lukas Czernere6fa0be2010-10-27 21:30:04 -04001373}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374
Jens Axboe018e0442009-06-26 16:27:10 +02001375extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
Adel Gadllah0b07de82008-06-26 13:48:27 +02001376
Martin K. Peterseneb28d312010-02-26 00:20:37 -05001377enum blk_default_limits {
1378 BLK_MAX_SEGMENTS = 128,
1379 BLK_SAFE_MAX_SECTORS = 255,
Jeff Moyerd2be5372015-08-13 14:57:57 -04001380 BLK_DEF_MAX_SECTORS = 2560,
Martin K. Peterseneb28d312010-02-26 00:20:37 -05001381 BLK_MAX_SEGMENT_SIZE = 65536,
1382 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1383};
Milan Broz0e435ac2008-12-03 12:55:08 +01001384
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1386
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001387static inline unsigned long queue_segment_boundary(struct request_queue *q)
1388{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001389 return q->limits.seg_boundary_mask;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001390}
1391
Keith Busch03100aa2015-08-19 14:24:05 -07001392static inline unsigned long queue_virt_boundary(struct request_queue *q)
1393{
1394 return q->limits.virt_boundary_mask;
1395}
1396
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001397static inline unsigned int queue_max_sectors(struct request_queue *q)
1398{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001399 return q->limits.max_sectors;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001400}
1401
1402static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1403{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001404 return q->limits.max_hw_sectors;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001405}
1406
Martin K. Petersen8a783622010-02-26 00:20:39 -05001407static inline unsigned short queue_max_segments(struct request_queue *q)
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001408{
Martin K. Petersen8a783622010-02-26 00:20:39 -05001409 return q->limits.max_segments;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001410}
1411
Christoph Hellwig1e739732017-02-08 14:46:49 +01001412static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1413{
1414 return q->limits.max_discard_segments;
1415}
1416
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001417static inline unsigned int queue_max_segment_size(struct request_queue *q)
1418{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001419 return q->limits.max_segment_size;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001420}
1421
Martin K. Petersene1defc42009-05-22 17:17:49 -04001422static inline unsigned short queue_logical_block_size(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423{
1424 int retval = 512;
1425
Martin K. Petersen025146e2009-05-22 17:17:51 -04001426 if (q && q->limits.logical_block_size)
1427 retval = q->limits.logical_block_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
1429 return retval;
1430}
1431
Martin K. Petersene1defc42009-05-22 17:17:49 -04001432static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433{
Martin K. Petersene1defc42009-05-22 17:17:49 -04001434 return queue_logical_block_size(bdev_get_queue(bdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435}
1436
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001437static inline unsigned int queue_physical_block_size(struct request_queue *q)
1438{
1439 return q->limits.physical_block_size;
1440}
1441
Martin K. Petersen892b6f92010-10-13 21:18:03 +02001442static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
Martin K. Petersenac481c22009-10-03 20:52:01 +02001443{
1444 return queue_physical_block_size(bdev_get_queue(bdev));
1445}
1446
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001447static inline unsigned int queue_io_min(struct request_queue *q)
1448{
1449 return q->limits.io_min;
1450}
1451
Martin K. Petersenac481c22009-10-03 20:52:01 +02001452static inline int bdev_io_min(struct block_device *bdev)
1453{
1454 return queue_io_min(bdev_get_queue(bdev));
1455}
1456
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001457static inline unsigned int queue_io_opt(struct request_queue *q)
1458{
1459 return q->limits.io_opt;
1460}
1461
Martin K. Petersenac481c22009-10-03 20:52:01 +02001462static inline int bdev_io_opt(struct block_device *bdev)
1463{
1464 return queue_io_opt(bdev_get_queue(bdev));
1465}
1466
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001467static inline int queue_alignment_offset(struct request_queue *q)
1468{
Martin K. Petersenac481c22009-10-03 20:52:01 +02001469 if (q->limits.misaligned)
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001470 return -1;
1471
Martin K. Petersenac481c22009-10-03 20:52:01 +02001472 return q->limits.alignment_offset;
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001473}
1474
Martin K. Petersene03a72e2010-01-11 03:21:51 -05001475static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
Martin K. Petersen81744ee2009-12-29 08:35:35 +01001476{
1477 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
Mike Snitzerb8839b82014-10-08 18:26:13 -04001478 unsigned int alignment = sector_div(sector, granularity >> 9) << 9;
Martin K. Petersen81744ee2009-12-29 08:35:35 +01001479
Mike Snitzerb8839b82014-10-08 18:26:13 -04001480 return (granularity + lim->alignment_offset - alignment) % granularity;
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001481}
1482
Martin K. Petersenac481c22009-10-03 20:52:01 +02001483static inline int bdev_alignment_offset(struct block_device *bdev)
1484{
1485 struct request_queue *q = bdev_get_queue(bdev);
1486
1487 if (q->limits.misaligned)
1488 return -1;
1489
1490 if (bdev != bdev->bd_contains)
1491 return bdev->bd_part->alignment_offset;
1492
1493 return q->limits.alignment_offset;
1494}
1495
Martin K. Petersen86b37282009-11-10 11:50:21 +01001496static inline int queue_discard_alignment(struct request_queue *q)
1497{
1498 if (q->limits.discard_misaligned)
1499 return -1;
1500
1501 return q->limits.discard_alignment;
1502}
1503
Martin K. Petersene03a72e2010-01-11 03:21:51 -05001504static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
Martin K. Petersen86b37282009-11-10 11:50:21 +01001505{
Linus Torvalds59771072012-12-19 07:18:35 -08001506 unsigned int alignment, granularity, offset;
Martin K. Petersendd3d1452010-01-11 03:21:48 -05001507
Martin K. Petersena934a002011-05-18 10:37:35 +02001508 if (!lim->max_discard_sectors)
1509 return 0;
1510
Linus Torvalds59771072012-12-19 07:18:35 -08001511 /* Why are these in bytes, not sectors? */
1512 alignment = lim->discard_alignment >> 9;
1513 granularity = lim->discard_granularity >> 9;
1514 if (!granularity)
1515 return 0;
1516
1517 /* Offset of the partition start in 'granularity' sectors */
1518 offset = sector_div(sector, granularity);
1519
1520 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1521 offset = (granularity + alignment - offset) % granularity;
1522
1523 /* Turn it back into bytes, gaah */
1524 return offset << 9;
Martin K. Petersen86b37282009-11-10 11:50:21 +01001525}
1526
Paolo Bonzinic6e66632012-08-02 09:48:50 +02001527static inline int bdev_discard_alignment(struct block_device *bdev)
1528{
1529 struct request_queue *q = bdev_get_queue(bdev);
1530
1531 if (bdev != bdev->bd_contains)
1532 return bdev->bd_part->discard_alignment;
1533
1534 return q->limits.discard_alignment;
1535}
1536
Martin K. Petersen4363ac72012-09-18 12:19:27 -04001537static inline unsigned int bdev_write_same(struct block_device *bdev)
1538{
1539 struct request_queue *q = bdev_get_queue(bdev);
1540
1541 if (q)
1542 return q->limits.max_write_same_sectors;
1543
1544 return 0;
1545}
1546
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -08001547static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1548{
1549 struct request_queue *q = bdev_get_queue(bdev);
1550
1551 if (q)
1552 return q->limits.max_write_zeroes_sectors;
1553
1554 return 0;
1555}
1556
Damien Le Moal797476b2016-10-18 15:40:29 +09001557static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1558{
1559 struct request_queue *q = bdev_get_queue(bdev);
1560
1561 if (q)
1562 return blk_queue_zoned_model(q);
1563
1564 return BLK_ZONED_NONE;
1565}
1566
1567static inline bool bdev_is_zoned(struct block_device *bdev)
1568{
1569 struct request_queue *q = bdev_get_queue(bdev);
1570
1571 if (q)
1572 return blk_queue_is_zoned(q);
1573
1574 return false;
1575}
1576
Damien Le Moalf99e8642017-01-12 07:58:32 -07001577static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +09001578{
1579 struct request_queue *q = bdev_get_queue(bdev);
1580
1581 if (q)
Damien Le Moalf99e8642017-01-12 07:58:32 -07001582 return blk_queue_zone_sectors(q);
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +09001583
1584 return 0;
1585}
1586
Jens Axboe165125e2007-07-24 09:28:11 +02001587static inline int queue_dma_alignment(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588{
Pete Wyckoff482eb682008-01-01 10:23:02 -05001589 return q ? q->dma_alignment : 511;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590}
1591
Namhyung Kim14417792010-09-15 13:08:27 +02001592static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
FUJITA Tomonori87904072008-08-28 15:05:58 +09001593 unsigned int len)
1594{
1595 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
Namhyung Kim14417792010-09-15 13:08:27 +02001596 return !(addr & alignment) && !(len & alignment);
FUJITA Tomonori87904072008-08-28 15:05:58 +09001597}
1598
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599/* assumes size > 256 */
1600static inline unsigned int blksize_bits(unsigned int size)
1601{
1602 unsigned int bits = 8;
1603 do {
1604 bits++;
1605 size >>= 1;
1606 } while (size > 256);
1607 return bits;
1608}
1609
Adrian Bunk2befb9e2005-09-10 00:27:17 -07001610static inline unsigned int block_size(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611{
1612 return bdev->bd_block_size;
1613}
1614
shaohua.li@intel.comf3876932011-05-06 11:34:32 -06001615static inline bool queue_flush_queueable(struct request_queue *q)
1616{
Jens Axboec888a8f2016-04-13 13:33:19 -06001617 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
shaohua.li@intel.comf3876932011-05-06 11:34:32 -06001618}
1619
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620typedef struct {struct page *v;} Sector;
1621
1622unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1623
1624static inline void put_dev_sector(Sector p)
1625{
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001626 put_page(p.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627}
1628
Ming Leie0af29172016-02-26 23:40:51 +08001629static inline bool __bvec_gap_to_prev(struct request_queue *q,
1630 struct bio_vec *bprv, unsigned int offset)
1631{
1632 return offset ||
1633 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
1634}
1635
Keith Busch03100aa2015-08-19 14:24:05 -07001636/*
1637 * Check if adding a bio_vec after bprv with offset would create a gap in
1638 * the SG list. Most drivers don't care about this, but some do.
1639 */
1640static inline bool bvec_gap_to_prev(struct request_queue *q,
1641 struct bio_vec *bprv, unsigned int offset)
1642{
1643 if (!queue_virt_boundary(q))
1644 return false;
Ming Leie0af29172016-02-26 23:40:51 +08001645 return __bvec_gap_to_prev(q, bprv, offset);
Keith Busch03100aa2015-08-19 14:24:05 -07001646}
1647
Ming Lei729204e2016-12-17 18:49:09 +08001648/*
1649 * Check if the two bvecs from two bios can be merged to one segment.
1650 * If yes, no need to check gap between the two bios since the 1st bio
1651 * and the 1st bvec in the 2nd bio can be handled in one segment.
1652 */
1653static inline bool bios_segs_mergeable(struct request_queue *q,
1654 struct bio *prev, struct bio_vec *prev_last_bv,
1655 struct bio_vec *next_first_bv)
1656{
1657 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv))
1658 return false;
1659 if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
1660 return false;
1661 if (prev->bi_seg_back_size + next_first_bv->bv_len >
1662 queue_max_segment_size(q))
1663 return false;
1664 return true;
1665}
1666
Ming Lei5a8d75a2017-04-14 13:58:29 -06001667static inline bool bio_will_gap(struct request_queue *q,
1668 struct request *prev_rq,
1669 struct bio *prev,
1670 struct bio *next)
Jens Axboe5e7c4272015-09-03 19:28:20 +03001671{
Ming Lei25e71a92016-02-26 23:40:52 +08001672 if (bio_has_data(prev) && queue_virt_boundary(q)) {
1673 struct bio_vec pb, nb;
Jens Axboe5e7c4272015-09-03 19:28:20 +03001674
Ming Lei5a8d75a2017-04-14 13:58:29 -06001675 /*
1676 * don't merge if the 1st bio starts with non-zero
1677 * offset, otherwise it is quite difficult to respect
1678 * sg gap limit. We work hard to merge a huge number of small
1679 * single bios in case of mkfs.
1680 */
1681 if (prev_rq)
1682 bio_get_first_bvec(prev_rq->bio, &pb);
1683 else
1684 bio_get_first_bvec(prev, &pb);
1685 if (pb.bv_offset)
1686 return true;
1687
1688 /*
1689 * We don't need to worry about the situation that the
1690 * merged segment ends in unaligned virt boundary:
1691 *
1692 * - if 'pb' ends aligned, the merged segment ends aligned
1693 * - if 'pb' ends unaligned, the next bio must include
1694 * one single bvec of 'nb', otherwise the 'nb' can't
1695 * merge with 'pb'
1696 */
Ming Lei25e71a92016-02-26 23:40:52 +08001697 bio_get_last_bvec(prev, &pb);
1698 bio_get_first_bvec(next, &nb);
1699
Ming Lei729204e2016-12-17 18:49:09 +08001700 if (!bios_segs_mergeable(q, prev, &pb, &nb))
1701 return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
Ming Lei25e71a92016-02-26 23:40:52 +08001702 }
1703
1704 return false;
Jens Axboe5e7c4272015-09-03 19:28:20 +03001705}
1706
1707static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
1708{
Ming Lei5a8d75a2017-04-14 13:58:29 -06001709 return bio_will_gap(req->q, req, req->biotail, bio);
Jens Axboe5e7c4272015-09-03 19:28:20 +03001710}
1711
1712static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
1713{
Ming Lei5a8d75a2017-04-14 13:58:29 -06001714 return bio_will_gap(req->q, NULL, bio, req->bio);
Jens Axboe5e7c4272015-09-03 19:28:20 +03001715}
1716
Jens Axboe59c3d452014-04-08 09:15:35 -06001717int kblockd_schedule_work(struct work_struct *work);
Jens Axboeee63cfa2016-08-24 15:52:48 -06001718int kblockd_schedule_work_on(int cpu, struct work_struct *work);
Jens Axboe59c3d452014-04-08 09:15:35 -06001719int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
Jens Axboe8ab14592014-04-08 09:17:40 -06001720int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
Jens Axboe818cd1c2017-04-10 09:54:55 -06001721int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
Divyesh Shah91952912010-04-01 15:01:41 -07001723#ifdef CONFIG_BLK_CGROUP
Jens Axboe28f41972010-06-01 12:23:18 +02001724/*
1725 * This should not be using sched_clock(). A real patch is in progress
1726 * to fix this up, until that is in place we need to disable preemption
1727 * around sched_clock() in this function and set_io_start_time_ns().
1728 */
Divyesh Shah91952912010-04-01 15:01:41 -07001729static inline void set_start_time_ns(struct request *req)
1730{
Jens Axboe28f41972010-06-01 12:23:18 +02001731 preempt_disable();
Divyesh Shah91952912010-04-01 15:01:41 -07001732 req->start_time_ns = sched_clock();
Jens Axboe28f41972010-06-01 12:23:18 +02001733 preempt_enable();
Divyesh Shah91952912010-04-01 15:01:41 -07001734}
1735
1736static inline void set_io_start_time_ns(struct request *req)
1737{
Jens Axboe28f41972010-06-01 12:23:18 +02001738 preempt_disable();
Divyesh Shah91952912010-04-01 15:01:41 -07001739 req->io_start_time_ns = sched_clock();
Jens Axboe28f41972010-06-01 12:23:18 +02001740 preempt_enable();
Divyesh Shah91952912010-04-01 15:01:41 -07001741}
Divyesh Shah84c124d2010-04-09 08:31:19 +02001742
1743static inline uint64_t rq_start_time_ns(struct request *req)
1744{
1745 return req->start_time_ns;
1746}
1747
1748static inline uint64_t rq_io_start_time_ns(struct request *req)
1749{
1750 return req->io_start_time_ns;
1751}
Divyesh Shah91952912010-04-01 15:01:41 -07001752#else
1753static inline void set_start_time_ns(struct request *req) {}
1754static inline void set_io_start_time_ns(struct request *req) {}
Divyesh Shah84c124d2010-04-09 08:31:19 +02001755static inline uint64_t rq_start_time_ns(struct request *req)
1756{
1757 return 0;
1758}
1759static inline uint64_t rq_io_start_time_ns(struct request *req)
1760{
1761 return 0;
1762}
Divyesh Shah91952912010-04-01 15:01:41 -07001763#endif
1764
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1766 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1767#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1768 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1769
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001770#if defined(CONFIG_BLK_DEV_INTEGRITY)
1771
Martin K. Petersen8288f492014-09-26 19:20:02 -04001772enum blk_integrity_flags {
1773 BLK_INTEGRITY_VERIFY = 1 << 0,
1774 BLK_INTEGRITY_GENERATE = 1 << 1,
Martin K. Petersen3aec2f42014-09-26 19:20:03 -04001775 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
Martin K. Petersenaae7df52014-09-26 19:20:05 -04001776 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
Martin K. Petersen8288f492014-09-26 19:20:02 -04001777};
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001778
Martin K. Petersen18593082014-09-26 19:20:01 -04001779struct blk_integrity_iter {
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001780 void *prot_buf;
1781 void *data_buf;
Martin K. Petersen3be91c42014-09-26 19:19:59 -04001782 sector_t seed;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001783 unsigned int data_size;
Martin K. Petersen3be91c42014-09-26 19:19:59 -04001784 unsigned short interval;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001785 const char *disk_name;
1786};
1787
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +02001788typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001789
Martin K. Petersen0f8087e2015-10-21 13:19:33 -04001790struct blk_integrity_profile {
1791 integrity_processing_fn *generate_fn;
1792 integrity_processing_fn *verify_fn;
1793 const char *name;
1794};
1795
Martin K. Petersen25520d52015-10-21 13:19:49 -04001796extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001797extern void blk_integrity_unregister(struct gendisk *);
Martin K. Petersenad7fce92008-10-01 03:38:39 -04001798extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
Martin K. Petersen13f05c82010-09-10 20:50:10 +02001799extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1800 struct scatterlist *);
1801extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
Martin K. Petersen4eaf99b2014-09-26 19:20:06 -04001802extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1803 struct request *);
1804extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1805 struct bio *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001806
Martin K. Petersen25520d52015-10-21 13:19:49 -04001807static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1808{
Dan Williamsac6fc482015-10-21 13:20:18 -04001809 struct blk_integrity *bi = &disk->queue->integrity;
Martin K. Petersen25520d52015-10-21 13:19:49 -04001810
1811 if (!bi->profile)
1812 return NULL;
1813
1814 return bi;
1815}
1816
Jens Axboeb04accc2008-10-02 12:53:22 +02001817static inline
1818struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1819{
Martin K. Petersen25520d52015-10-21 13:19:49 -04001820 return blk_get_integrity(bdev->bd_disk);
Martin K. Petersenb02739b2008-10-02 18:47:49 +02001821}
1822
Martin K. Petersen180b2f92014-09-26 19:19:56 -04001823static inline bool blk_integrity_rq(struct request *rq)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001824{
Martin K. Petersen180b2f92014-09-26 19:19:56 -04001825 return rq->cmd_flags & REQ_INTEGRITY;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001826}
1827
Martin K. Petersen13f05c82010-09-10 20:50:10 +02001828static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1829 unsigned int segs)
1830{
1831 q->limits.max_integrity_segments = segs;
1832}
1833
1834static inline unsigned short
1835queue_max_integrity_segments(struct request_queue *q)
1836{
1837 return q->limits.max_integrity_segments;
1838}
1839
Sagi Grimberg7f39add2015-09-11 09:03:04 -06001840static inline bool integrity_req_gap_back_merge(struct request *req,
1841 struct bio *next)
1842{
1843 struct bio_integrity_payload *bip = bio_integrity(req->bio);
1844 struct bio_integrity_payload *bip_next = bio_integrity(next);
1845
1846 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1847 bip_next->bip_vec[0].bv_offset);
1848}
1849
1850static inline bool integrity_req_gap_front_merge(struct request *req,
1851 struct bio *bio)
1852{
1853 struct bio_integrity_payload *bip = bio_integrity(bio);
1854 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
1855
1856 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1857 bip_next->bip_vec[0].bv_offset);
1858}
1859
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001860#else /* CONFIG_BLK_DEV_INTEGRITY */
1861
Stephen Rothwellfd832402012-01-12 09:17:30 +01001862struct bio;
1863struct block_device;
1864struct gendisk;
1865struct blk_integrity;
1866
1867static inline int blk_integrity_rq(struct request *rq)
1868{
1869 return 0;
1870}
1871static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1872 struct bio *b)
1873{
1874 return 0;
1875}
1876static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1877 struct bio *b,
1878 struct scatterlist *s)
1879{
1880 return 0;
1881}
1882static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1883{
Michele Curti61a04e52014-10-09 15:30:17 -07001884 return NULL;
Stephen Rothwellfd832402012-01-12 09:17:30 +01001885}
1886static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1887{
1888 return NULL;
1889}
1890static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1891{
1892 return 0;
1893}
Martin K. Petersen25520d52015-10-21 13:19:49 -04001894static inline void blk_integrity_register(struct gendisk *d,
Stephen Rothwellfd832402012-01-12 09:17:30 +01001895 struct blk_integrity *b)
1896{
Stephen Rothwellfd832402012-01-12 09:17:30 +01001897}
1898static inline void blk_integrity_unregister(struct gendisk *d)
1899{
1900}
1901static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1902 unsigned int segs)
1903{
1904}
1905static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1906{
1907 return 0;
1908}
Martin K. Petersen4eaf99b2014-09-26 19:20:06 -04001909static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1910 struct request *r1,
1911 struct request *r2)
Stephen Rothwellfd832402012-01-12 09:17:30 +01001912{
Martin K. Petersencb1a5ab2014-10-28 20:27:43 -06001913 return true;
Stephen Rothwellfd832402012-01-12 09:17:30 +01001914}
Martin K. Petersen4eaf99b2014-09-26 19:20:06 -04001915static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1916 struct request *r,
1917 struct bio *b)
Stephen Rothwellfd832402012-01-12 09:17:30 +01001918{
Martin K. Petersencb1a5ab2014-10-28 20:27:43 -06001919 return true;
Stephen Rothwellfd832402012-01-12 09:17:30 +01001920}
Martin K. Petersen25520d52015-10-21 13:19:49 -04001921
Sagi Grimberg7f39add2015-09-11 09:03:04 -06001922static inline bool integrity_req_gap_back_merge(struct request *req,
1923 struct bio *next)
1924{
1925 return false;
1926}
1927static inline bool integrity_req_gap_front_merge(struct request *req,
1928 struct bio *bio)
1929{
1930 return false;
1931}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001932
1933#endif /* CONFIG_BLK_DEV_INTEGRITY */
1934
Al Viro08f85852007-10-08 13:26:20 -04001935struct block_device_operations {
Al Virod4430d62008-03-02 09:09:22 -05001936 int (*open) (struct block_device *, fmode_t);
Al Virodb2a1442013-05-05 21:52:57 -04001937 void (*release) (struct gendisk *, fmode_t);
Jens Axboec11f0c02016-08-05 08:11:04 -06001938 int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
Al Virod4430d62008-03-02 09:09:22 -05001939 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1940 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
Tejun Heo77ea8872010-12-08 20:57:37 +01001941 unsigned int (*check_events) (struct gendisk *disk,
1942 unsigned int clearing);
1943 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
Al Viro08f85852007-10-08 13:26:20 -04001944 int (*media_changed) (struct gendisk *);
Tejun Heoc3e33e02010-05-15 20:09:29 +02001945 void (*unlock_native_capacity) (struct gendisk *);
Al Viro08f85852007-10-08 13:26:20 -04001946 int (*revalidate_disk) (struct gendisk *);
1947 int (*getgeo)(struct block_device *, struct hd_geometry *);
Nitin Guptab3a27d02010-05-17 11:02:43 +05301948 /* this callback is with swap_lock and sometimes page table lock held */
1949 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
Al Viro08f85852007-10-08 13:26:20 -04001950 struct module *owner;
Christoph Hellwigbbd3e062015-10-15 14:10:48 +02001951 const struct pr_ops *pr_ops;
Al Viro08f85852007-10-08 13:26:20 -04001952};
1953
Al Viro633a08b2007-08-29 20:34:12 -04001954extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1955 unsigned long);
Matthew Wilcox47a191f2014-06-04 16:07:46 -07001956extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1957extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1958 struct writeback_control *);
David Howells93614012006-09-30 20:45:40 +02001959#else /* CONFIG_BLOCK */
Fabian Frederickac13a822014-06-04 16:06:27 -07001960
1961struct block_device;
1962
David Howells93614012006-09-30 20:45:40 +02001963/*
1964 * stubs for when the block layer is configured out
1965 */
1966#define buffer_heads_over_limit 0
1967
David Howells93614012006-09-30 20:45:40 +02001968static inline long nr_blockdev_pages(void)
1969{
1970 return 0;
1971}
1972
Jens Axboe1f940bd2011-03-11 20:17:08 +01001973struct blk_plug {
1974};
1975
1976static inline void blk_start_plug(struct blk_plug *plug)
Jens Axboe73c10102011-03-08 13:19:51 +01001977{
1978}
1979
Jens Axboe1f940bd2011-03-11 20:17:08 +01001980static inline void blk_finish_plug(struct blk_plug *plug)
Jens Axboe73c10102011-03-08 13:19:51 +01001981{
1982}
1983
Jens Axboe1f940bd2011-03-11 20:17:08 +01001984static inline void blk_flush_plug(struct task_struct *task)
Jens Axboe73c10102011-03-08 13:19:51 +01001985{
1986}
1987
Jens Axboea237c1c2011-04-16 13:27:55 +02001988static inline void blk_schedule_flush_plug(struct task_struct *task)
1989{
1990}
1991
1992
Jens Axboe73c10102011-03-08 13:19:51 +01001993static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1994{
1995 return false;
1996}
1997
Fabian Frederickac13a822014-06-04 16:06:27 -07001998static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1999 sector_t *error_sector)
2000{
2001 return 0;
2002}
2003
David Howells93614012006-09-30 20:45:40 +02002004#endif /* CONFIG_BLOCK */
2005
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006#endif