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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_BLKDEV_H
2#define _LINUX_BLKDEV_H
3
Russell King85fd0bc2012-05-14 08:29:23 +02004#include <linux/sched.h>
Ingo Molnare6017572017-02-01 16:36:40 +01005#include <linux/sched/clock.h>
Russell King85fd0bc2012-05-14 08:29:23 +02006
Jens Axboef5ff8422007-09-21 09:19:54 +02007#ifdef CONFIG_BLOCK
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/major.h>
10#include <linux/genhd.h>
11#include <linux/list.h>
Jens Axboe320ae512013-10-24 09:20:05 +010012#include <linux/llist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/timer.h>
14#include <linux/workqueue.h>
15#include <linux/pagemap.h>
Tejun Heo66114ca2015-05-22 17:13:32 -040016#include <linux/backing-dev-defs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/wait.h>
18#include <linux/mempool.h>
Dan Williams34c0fd52016-01-15 16:56:14 -080019#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/bio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/stringify.h>
Hugh Dickins3e6053d2008-09-11 10:57:55 +020022#include <linux/gfp.h>
FUJITA Tomonorid351af02007-07-09 12:40:35 +020023#include <linux/bsg.h>
Jens Axboec7c22e42008-09-13 20:26:01 +020024#include <linux/smp.h>
Tejun Heo548bc8e2013-01-09 08:05:13 -080025#include <linux/rcupdate.h>
Tejun Heoadd703f2014-07-01 10:34:38 -060026#include <linux/percpu-refcount.h>
Christoph Hellwig84be4562015-05-01 12:46:15 +020027#include <linux/scatterlist.h>
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +090028#include <linux/blkzoned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Paul Gortmakerde477252011-05-26 13:46:22 -040030struct module;
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +010031struct scsi_ioctl_command;
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033struct request_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034struct elevator_queue;
Jens Axboe2056a782006-03-23 20:00:26 +010035struct blk_trace;
Jens Axboe3d6392c2007-07-09 12:38:05 +020036struct request;
37struct sg_io_hdr;
Mike Christieaa387cc2011-07-31 22:05:09 +020038struct bsg_job;
Tejun Heo3c798392012-04-16 13:57:25 -070039struct blkcg_gq;
Ming Lei7c94e1c2014-09-25 23:23:43 +080040struct blk_flush_queue;
Christoph Hellwigbbd3e062015-10-15 14:10:48 +020041struct pr_ops;
Jens Axboe87760e52016-11-09 12:38:14 -070042struct rq_wb;
Omar Sandoval34dbad52017-03-21 08:56:08 -070043struct blk_queue_stats;
44struct blk_stat_callback;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#define BLKDEV_MIN_RQ 4
47#define BLKDEV_MAX_RQ 128 /* Default maximum */
48
Stephen Bates02063192017-04-20 16:59:11 -060049/* Must be consisitent with blk_mq_poll_stats_bkt() */
50#define BLK_MQ_POLL_STATS_BKTS 16
51
Tejun Heo8bd435b2012-04-13 13:11:28 -070052/*
53 * Maximum number of blkcg policies allowed to be registered concurrently.
54 * Defined here to simplify include dependency.
55 */
Arianna Avanzinie21b7a02017-04-12 18:23:08 +020056#define BLKCG_MAX_POLS 3
Tejun Heo8bd435b2012-04-13 13:11:28 -070057
Tejun Heo8ffdc652006-01-06 09:49:03 +010058typedef void (rq_end_io_fn)(struct request *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Tejun Heo5b788ce2012-06-04 20:40:59 -070060#define BLK_RL_SYNCFULL (1U << 0)
61#define BLK_RL_ASYNCFULL (1U << 1)
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063struct request_list {
Tejun Heo5b788ce2012-06-04 20:40:59 -070064 struct request_queue *q; /* the queue this rl belongs to */
Tejun Heoa0516612012-06-26 15:05:44 -070065#ifdef CONFIG_BLK_CGROUP
66 struct blkcg_gq *blkg; /* blkg this request pool belongs to */
67#endif
Jens Axboe1faa16d2009-04-06 14:48:01 +020068 /*
69 * count[], starved[], and wait[] are indexed by
70 * BLK_RW_SYNC/BLK_RW_ASYNC
71 */
Tejun Heo8a5ecdd2012-06-04 20:40:58 -070072 int count[2];
73 int starved[2];
74 mempool_t *rq_pool;
75 wait_queue_head_t wait[2];
Tejun Heo5b788ce2012-06-04 20:40:59 -070076 unsigned int flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077};
78
Jens Axboe4aff5e22006-08-10 08:44:47 +020079/*
Christoph Hellwige8064022016-10-20 15:12:13 +020080 * request flags */
81typedef __u32 __bitwise req_flags_t;
82
83/* elevator knows about this request */
84#define RQF_SORTED ((__force req_flags_t)(1 << 0))
85/* drive already may have started this one */
86#define RQF_STARTED ((__force req_flags_t)(1 << 1))
87/* uses tagged queueing */
88#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
89/* may not be passed by ioscheduler */
90#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
91/* request for flush sequence */
92#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
93/* merge of different types, fail separately */
94#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
95/* track inflight for MQ */
96#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
97/* don't call prep for this one */
98#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
99/* set for "ide_preempt" requests and also for requests for which the SCSI
100 "quiesce" state must be ignored. */
101#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
102/* contains copies of user pages */
103#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
104/* vaguely specified driver internal error. Ignored by the block layer */
105#define RQF_FAILED ((__force req_flags_t)(1 << 10))
106/* don't warn about errors */
107#define RQF_QUIET ((__force req_flags_t)(1 << 11))
108/* elevator private data attached */
109#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
110/* account I/O stat */
111#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
112/* request came from our alloc pool */
113#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
114/* runtime pm request */
115#define RQF_PM ((__force req_flags_t)(1 << 15))
116/* on IO scheduler merge hash */
117#define RQF_HASHED ((__force req_flags_t)(1 << 16))
Jens Axboecf43e6b2016-11-07 21:32:37 -0700118/* IO stats tracking on */
119#define RQF_STATS ((__force req_flags_t)(1 << 17))
Christoph Hellwigf9d03f92016-12-08 15:20:32 -0700120/* Look at ->special_vec for the actual data payload instead of the
121 bio chain. */
122#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
Christoph Hellwige8064022016-10-20 15:12:13 +0200123
124/* flags that prevent us from merging requests: */
125#define RQF_NOMERGE_FLAGS \
Christoph Hellwigf9d03f92016-12-08 15:20:32 -0700126 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
Christoph Hellwige8064022016-10-20 15:12:13 +0200127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128/*
Christoph Hellwigaf76e552014-05-06 12:12:45 +0200129 * Try to put the fields that are referenced together in the same cacheline.
130 *
131 * If you modify this structure, make sure to update blk_rq_init() and
132 * especially blk_mq_rq_ctx_init() to take care of the added fields.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 */
134struct request {
Christoph Hellwig6897fc22014-01-30 15:45:47 -0800135 struct list_head queuelist;
Jens Axboe320ae512013-10-24 09:20:05 +0100136 union {
137 struct call_single_data csd;
Jan Kara9828c2c2016-06-28 09:03:59 +0200138 u64 fifo_time;
Jens Axboe320ae512013-10-24 09:20:05 +0100139 };
Jens Axboeff856ba2006-01-09 16:02:34 +0100140
Jens Axboe165125e2007-07-24 09:28:11 +0200141 struct request_queue *q;
Jens Axboe320ae512013-10-24 09:20:05 +0100142 struct blk_mq_ctx *mq_ctx;
Jens Axboee6a1c872006-08-10 09:00:21 +0200143
Richard Kennedy181fdde2010-03-19 08:58:16 +0100144 int cpu;
Christoph Hellwigef295ec2016-10-28 08:48:16 -0600145 unsigned int cmd_flags; /* op and common flags */
Christoph Hellwige8064022016-10-20 15:12:13 +0200146 req_flags_t rq_flags;
Jens Axboed486f1f2017-01-31 12:34:41 -0700147
148 int internal_tag;
149
Christoph Hellwigca93e452016-06-09 16:00:35 +0200150 unsigned long atomic_flags;
Richard Kennedy181fdde2010-03-19 08:58:16 +0100151
Tejun Heoa2dec7b2009-05-07 22:24:44 +0900152 /* the following two fields are internal, NEVER access directly */
Tejun Heoa2dec7b2009-05-07 22:24:44 +0900153 unsigned int __data_len; /* total data len */
Jens Axboebd166ef2017-01-17 06:03:22 -0700154 int tag;
Richard Kennedy181fdde2010-03-19 08:58:16 +0100155 sector_t __sector; /* sector cursor */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157 struct bio *bio;
158 struct bio *biotail;
159
Jens Axboe360f92c2014-04-09 20:27:01 -0600160 /*
161 * The hash is used inside the scheduler, and killed once the
162 * request reaches the dispatch list. The ipi_list is only used
163 * to queue the request for softirq completion, which is long
164 * after the request has been unhashed (and even removed from
165 * the dispatch list).
166 */
167 union {
168 struct hlist_node hash; /* merge hash */
169 struct list_head ipi_list;
170 };
171
Jens Axboee6a1c872006-08-10 09:00:21 +0200172 /*
173 * The rb_node is only used inside the io scheduler, requests
174 * are pruned when moved to the dispatch queue. So let the
Mike Snitzerc1867942011-02-11 11:08:00 +0100175 * completion_data share space with the rb_node.
Jens Axboee6a1c872006-08-10 09:00:21 +0200176 */
177 union {
178 struct rb_node rb_node; /* sort/lookup */
Christoph Hellwigf9d03f92016-12-08 15:20:32 -0700179 struct bio_vec special_vec;
Mike Snitzerc1867942011-02-11 11:08:00 +0100180 void *completion_data;
Christoph Hellwige26738e2017-04-20 16:03:11 +0200181 int error_count; /* for legacy drivers, don't use */
Jens Axboee6a1c872006-08-10 09:00:21 +0200182 };
Jens Axboe98170642006-07-28 09:23:08 +0200183
Jens Axboeff7d1452006-07-12 14:04:37 +0200184 /*
Vivek Goyal7f1dc8a2010-04-21 17:44:16 +0200185 * Three pointers are available for the IO schedulers, if they need
Mike Snitzerc1867942011-02-11 11:08:00 +0100186 * more they have to dynamically allocate it. Flush requests are
187 * never put on the IO scheduler. So let the flush fields share
Tejun Heoa612fdd2011-12-14 00:33:41 +0100188 * space with the elevator data.
Jens Axboeff7d1452006-07-12 14:04:37 +0200189 */
Mike Snitzerc1867942011-02-11 11:08:00 +0100190 union {
Tejun Heoa612fdd2011-12-14 00:33:41 +0100191 struct {
192 struct io_cq *icq;
193 void *priv[2];
194 } elv;
195
Mike Snitzerc1867942011-02-11 11:08:00 +0100196 struct {
197 unsigned int seq;
198 struct list_head list;
Jeff Moyer4853aba2011-08-15 21:37:25 +0200199 rq_end_io_fn *saved_end_io;
Mike Snitzerc1867942011-02-11 11:08:00 +0100200 } flush;
201 };
Jens Axboeff7d1452006-07-12 14:04:37 +0200202
Jens Axboe8f34ee72006-06-13 09:02:34 +0200203 struct gendisk *rq_disk;
Jerome Marchand09e099d2011-01-05 16:57:38 +0100204 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 unsigned long start_time;
Jens Axboecf43e6b2016-11-07 21:32:37 -0700206 struct blk_issue_stat issue_stat;
Divyesh Shah91952912010-04-01 15:01:41 -0700207#ifdef CONFIG_BLK_CGROUP
Tejun Heoa0516612012-06-26 15:05:44 -0700208 struct request_list *rl; /* rl this rq is alloced from */
Divyesh Shah91952912010-04-01 15:01:41 -0700209 unsigned long long start_time_ns;
210 unsigned long long io_start_time_ns; /* when passed to hardware */
211#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 /* Number of scatter-gather DMA addr+len pairs after
213 * physical address coalescing is performed.
214 */
215 unsigned short nr_phys_segments;
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200216#if defined(CONFIG_BLK_DEV_INTEGRITY)
217 unsigned short nr_integrity_segments;
218#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Jens Axboe8f34ee72006-06-13 09:02:34 +0200220 unsigned short ioprio;
221
Jens Axboe1dd51982017-04-05 12:16:38 -0600222 unsigned int timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 void *special; /* opaque pointer available for LLD use */
Jens Axboecdd60262006-07-28 09:32:07 +0200225
FUJITA Tomonori7a85f882008-03-04 11:17:11 +0100226 unsigned int extra_len; /* length of alignment and padding */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Jens Axboe242f9dc2008-09-14 05:55:09 -0700228 unsigned long deadline;
229 struct list_head timeout_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 /*
Jens Axboec00895a2006-09-30 20:29:12 +0200232 * completion callback.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 */
234 rq_end_io_fn *end_io;
235 void *end_io_data;
FUJITA Tomonoriabae1fd2007-07-16 08:52:14 +0200236
237 /* for bidi */
238 struct request *next_rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239};
240
Christoph Hellwigaebf5262017-01-31 16:57:31 +0100241static inline bool blk_rq_is_scsi(struct request *rq)
242{
243 return req_op(rq) == REQ_OP_SCSI_IN || req_op(rq) == REQ_OP_SCSI_OUT;
244}
245
246static inline bool blk_rq_is_private(struct request *rq)
247{
248 return req_op(rq) == REQ_OP_DRV_IN || req_op(rq) == REQ_OP_DRV_OUT;
249}
250
Christoph Hellwig57292b52017-01-31 16:57:29 +0100251static inline bool blk_rq_is_passthrough(struct request *rq)
252{
Christoph Hellwigaebf5262017-01-31 16:57:31 +0100253 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
Christoph Hellwig57292b52017-01-31 16:57:29 +0100254}
255
Fernando Luis Vázquez Cao766ca442008-08-14 09:59:13 +0200256static inline unsigned short req_get_ioprio(struct request *req)
257{
258 return req->ioprio;
259}
260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261#include <linux/elevator.h>
262
Jens Axboe320ae512013-10-24 09:20:05 +0100263struct blk_queue_ctx;
264
Jens Axboe165125e2007-07-24 09:28:11 +0200265typedef void (request_fn_proc) (struct request_queue *q);
Jens Axboedece1632015-11-05 10:41:16 -0700266typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
Jens Axboe165125e2007-07-24 09:28:11 +0200267typedef int (prep_rq_fn) (struct request_queue *, struct request *);
James Bottomley28018c22010-07-01 19:49:17 +0900268typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270struct bio_vec;
Jens Axboeff856ba2006-01-09 16:02:34 +0100271typedef void (softirq_done_fn)(struct request *);
Tejun Heo2fb98e82008-02-19 11:36:53 +0100272typedef int (dma_drain_needed_fn)(struct request *);
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +0200273typedef int (lld_busy_fn) (struct request_queue *q);
Mike Christieaa387cc2011-07-31 22:05:09 +0200274typedef int (bsg_job_fn) (struct bsg_job *);
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700275typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
276typedef void (exit_rq_fn)(struct request_queue *, struct request *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Jens Axboe242f9dc2008-09-14 05:55:09 -0700278enum blk_eh_timer_return {
279 BLK_EH_NOT_HANDLED,
280 BLK_EH_HANDLED,
281 BLK_EH_RESET_TIMER,
282};
283
284typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286enum blk_queue_state {
287 Queue_down,
288 Queue_up,
289};
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291struct blk_queue_tag {
292 struct request **tag_index; /* map of busy tags */
293 unsigned long *tag_map; /* bit map of free/busy tags */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 int max_depth; /* what we will send to device */
Tejun Heoba025082005-08-05 13:28:11 -0700295 int real_max_depth; /* what the array can hold */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 atomic_t refcnt; /* map can be shared */
Shaohua Liee1b6f72015-01-15 17:32:25 -0800297 int alloc_policy; /* tag allocation policy */
298 int next_tag; /* next tag */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
Shaohua Liee1b6f72015-01-15 17:32:25 -0800300#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
301#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900303#define BLK_SCSI_MAX_CMDS (256)
304#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
305
Damien Le Moal797476b2016-10-18 15:40:29 +0900306/*
307 * Zoned block device models (zoned limit).
308 */
309enum blk_zoned_model {
310 BLK_ZONED_NONE, /* Regular block device */
311 BLK_ZONED_HA, /* Host-aware zoned block device */
312 BLK_ZONED_HM, /* Host-managed zoned block device */
313};
314
Martin K. Petersen025146e2009-05-22 17:17:51 -0400315struct queue_limits {
316 unsigned long bounce_pfn;
317 unsigned long seg_boundary_mask;
Keith Busch03100aa2015-08-19 14:24:05 -0700318 unsigned long virt_boundary_mask;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400319
320 unsigned int max_hw_sectors;
Martin K. Petersenca369d52015-11-13 16:46:48 -0500321 unsigned int max_dev_sectors;
Jens Axboe762380a2014-06-05 13:38:39 -0600322 unsigned int chunk_sectors;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400323 unsigned int max_sectors;
324 unsigned int max_segment_size;
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400325 unsigned int physical_block_size;
326 unsigned int alignment_offset;
327 unsigned int io_min;
328 unsigned int io_opt;
Christoph Hellwig67efc922009-09-30 13:54:20 +0200329 unsigned int max_discard_sectors;
Jens Axboe0034af02015-07-16 09:14:26 -0600330 unsigned int max_hw_discard_sectors;
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400331 unsigned int max_write_same_sectors;
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800332 unsigned int max_write_zeroes_sectors;
Martin K. Petersen86b37282009-11-10 11:50:21 +0100333 unsigned int discard_granularity;
334 unsigned int discard_alignment;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400335
336 unsigned short logical_block_size;
Martin K. Petersen8a783622010-02-26 00:20:39 -0500337 unsigned short max_segments;
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200338 unsigned short max_integrity_segments;
Christoph Hellwig1e739732017-02-08 14:46:49 +0100339 unsigned short max_discard_segments;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400340
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400341 unsigned char misaligned;
Martin K. Petersen86b37282009-11-10 11:50:21 +0100342 unsigned char discard_misaligned;
Martin K. Petersene692cb62010-12-01 19:41:49 +0100343 unsigned char cluster;
Kent Overstreetc78afc62013-07-11 22:39:53 -0700344 unsigned char raid_partial_stripes_expensive;
Damien Le Moal797476b2016-10-18 15:40:29 +0900345 enum blk_zoned_model zoned;
Martin K. Petersen025146e2009-05-22 17:17:51 -0400346};
347
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +0900348#ifdef CONFIG_BLK_DEV_ZONED
349
350struct blk_zone_report_hdr {
351 unsigned int nr_zones;
352 u8 padding[60];
353};
354
355extern int blkdev_report_zones(struct block_device *bdev,
356 sector_t sector, struct blk_zone *zones,
357 unsigned int *nr_zones, gfp_t gfp_mask);
358extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
359 sector_t nr_sectors, gfp_t gfp_mask);
360
Shaun Tancheff3ed05a92016-10-18 15:40:35 +0900361extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
362 unsigned int cmd, unsigned long arg);
363extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
364 unsigned int cmd, unsigned long arg);
365
366#else /* CONFIG_BLK_DEV_ZONED */
367
368static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
369 fmode_t mode, unsigned int cmd,
370 unsigned long arg)
371{
372 return -ENOTTY;
373}
374
375static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
376 fmode_t mode, unsigned int cmd,
377 unsigned long arg)
378{
379 return -ENOTTY;
380}
381
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +0900382#endif /* CONFIG_BLK_DEV_ZONED */
383
Richard Kennedyd7b76302011-07-13 21:17:23 +0200384struct request_queue {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 /*
386 * Together with queue_head for cacheline sharing
387 */
388 struct list_head queue_head;
389 struct request *last_merge;
Jens Axboeb374d182008-10-31 10:05:07 +0100390 struct elevator_queue *elevator;
Tejun Heo8a5ecdd2012-06-04 20:40:58 -0700391 int nr_rqs[2]; /* # allocated [a]sync rqs */
392 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Jens Axboe8e8320c2017-06-20 17:56:13 -0600394 atomic_t shared_hctx_restart;
395
Omar Sandoval34dbad52017-03-21 08:56:08 -0700396 struct blk_queue_stats *stats;
Jens Axboe87760e52016-11-09 12:38:14 -0700397 struct rq_wb *rq_wb;
398
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 /*
Tejun Heoa0516612012-06-26 15:05:44 -0700400 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
401 * is used, root blkg allocates from @q->root_rl and all other
402 * blkgs from their own blkg->rl. Which one to use should be
403 * determined using bio_request_list().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 */
Tejun Heoa0516612012-06-26 15:05:44 -0700405 struct request_list root_rl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 request_fn_proc *request_fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 make_request_fn *make_request_fn;
409 prep_rq_fn *prep_rq_fn;
James Bottomley28018c22010-07-01 19:49:17 +0900410 unprep_rq_fn *unprep_rq_fn;
Jens Axboeff856ba2006-01-09 16:02:34 +0100411 softirq_done_fn *softirq_done_fn;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700412 rq_timed_out_fn *rq_timed_out_fn;
Tejun Heo2fb98e82008-02-19 11:36:53 +0100413 dma_drain_needed_fn *dma_drain_needed;
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +0200414 lld_busy_fn *lld_busy_fn;
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700415 init_rq_fn *init_rq_fn;
416 exit_rq_fn *exit_rq_fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Jens Axboef8a5b122016-12-13 09:24:51 -0700418 const struct blk_mq_ops *mq_ops;
Jens Axboe320ae512013-10-24 09:20:05 +0100419
420 unsigned int *mq_map;
421
422 /* sw queues */
Ming Leie6cdb092014-06-03 11:24:06 +0800423 struct blk_mq_ctx __percpu *queue_ctx;
Jens Axboe320ae512013-10-24 09:20:05 +0100424 unsigned int nr_queues;
425
Jens Axboed278d4a2016-03-30 10:21:08 -0600426 unsigned int queue_depth;
427
Jens Axboe320ae512013-10-24 09:20:05 +0100428 /* hw dispatch queues */
429 struct blk_mq_hw_ctx **queue_hw_ctx;
430 unsigned int nr_hw_queues;
431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 /*
Tejun Heo8922e162005-10-20 16:23:44 +0200433 * Dispatch queue sorting
434 */
Jens Axboe1b47f532005-10-20 16:37:00 +0200435 sector_t end_sector;
Tejun Heo8922e162005-10-20 16:23:44 +0200436 struct request *boundary_rq;
Tejun Heo8922e162005-10-20 16:23:44 +0200437
438 /*
Jens Axboe3cca6dc2011-03-02 11:08:00 -0500439 * Delayed queue handling
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 */
Jens Axboe3cca6dc2011-03-02 11:08:00 -0500441 struct delayed_work delay_work;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Jan Karadc3b17c2017-02-02 15:56:50 +0100443 struct backing_dev_info *backing_dev_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445 /*
446 * The queue owner gets to use this for whatever they like.
447 * ll_rw_blk doesn't touch it.
448 */
449 void *queuedata;
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 * various queue flags, see QUEUE_* below
453 */
454 unsigned long queue_flags;
455
456 /*
Tejun Heoa73f7302011-12-14 00:33:37 +0100457 * ida allocated id for this queue. Used to index queues from
458 * ioctx.
459 */
460 int id;
461
462 /*
Richard Kennedyd7b76302011-07-13 21:17:23 +0200463 * queue needs bounce pages for pages above this limit
464 */
465 gfp_t bounce_gfp;
466
467 /*
152587d2005-04-12 16:22:06 -0500468 * protects queue structures from reentrancy. ->__queue_lock should
469 * _never_ be used directly, it is queue private. always use
470 * ->queue_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 */
152587d2005-04-12 16:22:06 -0500472 spinlock_t __queue_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 spinlock_t *queue_lock;
474
475 /*
476 * queue kobject
477 */
478 struct kobject kobj;
479
Jens Axboe320ae512013-10-24 09:20:05 +0100480 /*
481 * mq queue kobject
482 */
483 struct kobject mq_kobj;
484
Dan Williamsac6fc482015-10-21 13:20:18 -0400485#ifdef CONFIG_BLK_DEV_INTEGRITY
486 struct blk_integrity integrity;
487#endif /* CONFIG_BLK_DEV_INTEGRITY */
488
Rafael J. Wysocki47fafbc2014-12-04 01:00:23 +0100489#ifdef CONFIG_PM
Lin Ming6c954662013-03-23 11:42:26 +0800490 struct device *dev;
491 int rpm_status;
492 unsigned int nr_pending;
493#endif
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /*
496 * queue settings
497 */
498 unsigned long nr_requests; /* Max # of requests */
499 unsigned int nr_congestion_on;
500 unsigned int nr_congestion_off;
501 unsigned int nr_batching;
502
James Bottomleyfa0ccd82008-01-10 11:30:36 -0600503 unsigned int dma_drain_size;
Richard Kennedyd7b76302011-07-13 21:17:23 +0200504 void *dma_drain_buffer;
Tejun Heoe3790c72008-03-04 11:18:17 +0100505 unsigned int dma_pad_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 unsigned int dma_alignment;
507
508 struct blk_queue_tag *queue_tags;
Jens Axboe6eca9002007-10-25 10:14:47 +0200509 struct list_head tag_busy_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Tejun Heo15853af2005-11-10 08:52:05 +0100511 unsigned int nr_sorted;
Jens Axboe0a7ae2f2009-05-20 08:54:31 +0200512 unsigned int in_flight[2];
Jens Axboecf43e6b2016-11-07 21:32:37 -0700513
Bart Van Assche24faf6f2012-11-28 13:46:45 +0100514 /*
515 * Number of active block driver functions for which blk_drain_queue()
516 * must wait. Must be incremented around functions that unlock the
517 * queue_lock internally, e.g. scsi_request_fn().
518 */
519 unsigned int request_fn_active;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Jens Axboe242f9dc2008-09-14 05:55:09 -0700521 unsigned int rq_timeout;
Jens Axboe64f1c212016-11-14 13:03:03 -0700522 int poll_nsec;
Omar Sandoval34dbad52017-03-21 08:56:08 -0700523
524 struct blk_stat_callback *poll_cb;
Stephen Bates02063192017-04-20 16:59:11 -0600525 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
Omar Sandoval34dbad52017-03-21 08:56:08 -0700526
Jens Axboe242f9dc2008-09-14 05:55:09 -0700527 struct timer_list timeout;
Christoph Hellwig287922e2015-10-30 20:57:30 +0800528 struct work_struct timeout_work;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700529 struct list_head timeout_list;
530
Tejun Heoa612fdd2011-12-14 00:33:41 +0100531 struct list_head icq_list;
Tejun Heo4eef3042012-03-05 13:15:18 -0800532#ifdef CONFIG_BLK_CGROUP
Tejun Heoa2b16932012-04-13 13:11:33 -0700533 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
Tejun Heo3c798392012-04-16 13:57:25 -0700534 struct blkcg_gq *root_blkg;
Tejun Heo03aa2642012-03-05 13:15:19 -0800535 struct list_head blkg_list;
Tejun Heo4eef3042012-03-05 13:15:18 -0800536#endif
Tejun Heoa612fdd2011-12-14 00:33:41 +0100537
Martin K. Petersen025146e2009-05-22 17:17:51 -0400538 struct queue_limits limits;
539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 /*
541 * sg stuff
542 */
543 unsigned int sg_timeout;
544 unsigned int sg_reserved_size;
Christoph Lameter19460892005-06-23 00:08:19 -0700545 int node;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700546#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +0100547 struct blk_trace *blk_trace;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700548#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 /*
Tejun Heo4913efe2010-09-03 11:56:16 +0200550 * for flush operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 */
Ming Lei7c94e1c2014-09-25 23:23:43 +0800552 struct blk_flush_queue *fq;
Al Viro483f4af2006-03-18 18:34:37 -0500553
Christoph Hellwig6fca6a62014-05-28 08:08:02 -0600554 struct list_head requeue_list;
555 spinlock_t requeue_lock;
Mike Snitzer28494502016-09-14 13:28:30 -0400556 struct delayed_work requeue_work;
Christoph Hellwig6fca6a62014-05-28 08:08:02 -0600557
Al Viro483f4af2006-03-18 18:34:37 -0500558 struct mutex sysfs_lock;
FUJITA Tomonorid351af02007-07-09 12:40:35 +0200559
Tejun Heod7325802012-03-05 13:14:58 -0800560 int bypass_depth;
Christoph Hellwig4ecd4fe2015-05-07 09:38:13 +0200561 atomic_t mq_freeze_depth;
Tejun Heod7325802012-03-05 13:14:58 -0800562
FUJITA Tomonorid351af02007-07-09 12:40:35 +0200563#if defined(CONFIG_BLK_DEV_BSG)
Mike Christieaa387cc2011-07-31 22:05:09 +0200564 bsg_job_fn *bsg_job_fn;
565 int bsg_job_size;
FUJITA Tomonorid351af02007-07-09 12:40:35 +0200566 struct bsg_class_device bsg_dev;
567#endif
Vivek Goyale43473b2010-09-15 17:06:35 -0400568
569#ifdef CONFIG_BLK_DEV_THROTTLING
570 /* Throttle data */
571 struct throtl_data *td;
572#endif
Tejun Heo548bc8e2013-01-09 08:05:13 -0800573 struct rcu_head rcu_head;
Jens Axboe320ae512013-10-24 09:20:05 +0100574 wait_queue_head_t mq_freeze_wq;
Dan Williams3ef28e82015-10-21 13:20:12 -0400575 struct percpu_ref q_usage_counter;
Jens Axboe320ae512013-10-24 09:20:05 +0100576 struct list_head all_q_node;
Jens Axboe0d2602c2014-05-13 15:10:52 -0600577
578 struct blk_mq_tag_set *tag_set;
579 struct list_head tag_set_list;
Kent Overstreet54efd502015-04-23 22:37:18 -0700580 struct bio_set *bio_split;
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900581
Omar Sandoval03796c12017-01-31 14:53:18 -0800582#ifdef CONFIG_BLK_DEBUG_FS
Omar Sandoval07e4fea2017-01-25 08:06:40 -0800583 struct dentry *debugfs_dir;
Omar Sandovald332ce02017-05-04 08:24:40 -0600584 struct dentry *sched_debugfs_dir;
Omar Sandoval07e4fea2017-01-25 08:06:40 -0800585#endif
586
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900587 bool mq_sysfs_init_done;
Christoph Hellwig6d247d72017-01-27 09:51:45 -0700588
589 size_t cmd_size;
590 void *rq_alloc_data;
Bart Van Asschedc9edc42017-06-14 13:27:50 -0600591
592 struct work_struct release_work;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593};
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
596#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
Jens Axboe1faa16d2009-04-06 14:48:01 +0200597#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
598#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100599#define QUEUE_FLAG_DYING 5 /* queue being torn down */
Tejun Heod7325802012-03-05 13:14:58 -0800600#define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
Jens Axboec21e6be2011-04-19 13:32:46 +0200601#define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
602#define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
Dan Williams5757a6d2011-07-23 20:44:25 +0200603#define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
Jens Axboec21e6be2011-04-19 13:32:46 +0200604#define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
605#define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
606#define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
Fernando Luis Vázquez Cao88e740f2008-10-27 18:44:46 +0900607#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
Jens Axboec21e6be2011-04-19 13:32:46 +0200608#define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
609#define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
610#define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
611#define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
Christoph Hellwig288dab82016-06-09 16:00:36 +0200612#define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
Dan Williams5757a6d2011-07-23 20:44:25 +0200613#define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
Bart Van Asschec246e802012-12-06 14:32:01 +0100614#define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
Jens Axboe320ae512013-10-24 09:20:05 +0100615#define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
Jens Axboe05f1dd52014-05-29 09:53:32 -0600616#define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
Jens Axboe05229beed2015-11-05 10:44:55 -0700617#define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
Jens Axboe93e9d8e2016-04-12 12:32:46 -0600618#define QUEUE_FLAG_WC 23 /* Write back caching */
619#define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
Jens Axboec888a8f2016-04-13 13:33:19 -0600620#define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
Toshi Kani163d4ba2016-06-23 17:05:50 -0400621#define QUEUE_FLAG_DAX 26 /* device supports DAX */
Jens Axboecf43e6b2016-11-07 21:32:37 -0700622#define QUEUE_FLAG_STATS 27 /* track rq completion times */
Jens Axboe65f619d2017-04-07 12:45:20 -0600623#define QUEUE_FLAG_POLL_STATS 28 /* collecting stats for hybrid polling */
624#define QUEUE_FLAG_REGISTERED 29 /* queue has been registered to a disk */
Jens Axboebc58ba92009-01-23 10:54:44 +0100625
626#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
Jens Axboe01e97f62009-09-03 20:06:47 +0200627 (1 << QUEUE_FLAG_STACKABLE) | \
Jens Axboee2e1a142010-06-09 10:42:09 +0200628 (1 << QUEUE_FLAG_SAME_COMP) | \
629 (1 << QUEUE_FLAG_ADD_RANDOM))
Tejun Heo797e7db2006-01-06 09:51:03 +0100630
Jens Axboe94eddfb2013-11-19 09:25:07 -0700631#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
Mike Snitzerad9cf3b2014-12-16 12:54:25 -0500632 (1 << QUEUE_FLAG_STACKABLE) | \
Christoph Hellwig8e0b60b2016-03-03 16:04:03 +0100633 (1 << QUEUE_FLAG_SAME_COMP) | \
634 (1 << QUEUE_FLAG_POLL))
Jens Axboe94eddfb2013-11-19 09:25:07 -0700635
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200636static inline void queue_lockdep_assert_held(struct request_queue *q)
Linus Torvalds8f45c1a2008-04-29 10:16:38 -0700637{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200638 if (q->queue_lock)
639 lockdep_assert_held(q->queue_lock);
Linus Torvalds8f45c1a2008-04-29 10:16:38 -0700640}
641
Nick Piggin75ad23b2008-04-29 14:48:33 +0200642static inline void queue_flag_set_unlocked(unsigned int flag,
643 struct request_queue *q)
644{
645 __set_bit(flag, &q->queue_flags);
646}
647
Jens Axboee48ec692008-07-03 13:18:54 +0200648static inline int queue_flag_test_and_clear(unsigned int flag,
649 struct request_queue *q)
650{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200651 queue_lockdep_assert_held(q);
Jens Axboee48ec692008-07-03 13:18:54 +0200652
653 if (test_bit(flag, &q->queue_flags)) {
654 __clear_bit(flag, &q->queue_flags);
655 return 1;
656 }
657
658 return 0;
659}
660
661static inline int queue_flag_test_and_set(unsigned int flag,
662 struct request_queue *q)
663{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200664 queue_lockdep_assert_held(q);
Jens Axboee48ec692008-07-03 13:18:54 +0200665
666 if (!test_bit(flag, &q->queue_flags)) {
667 __set_bit(flag, &q->queue_flags);
668 return 0;
669 }
670
671 return 1;
672}
673
Nick Piggin75ad23b2008-04-29 14:48:33 +0200674static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
675{
Andi Kleen8bcb6c72012-03-30 12:33:28 +0200676 queue_lockdep_assert_held(q);
Nick Piggin75ad23b2008-04-29 14:48:33 +0200677 __set_bit(flag, &q->queue_flags);
678}
679
680static inline void queue_flag_clear_unlocked(unsigned int flag,
681 struct request_queue *q)
682{
683 __clear_bit(flag, &q->queue_flags);
684}
685
Jens Axboe0a7ae2f2009-05-20 08:54:31 +0200686static inline int queue_in_flight(struct request_queue *q)
687{
688 return q->in_flight[0] + q->in_flight[1];
689}
690
Nick Piggin75ad23b2008-04-29 14:48:33 +0200691static inline void queue_flag_clear(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 __clear_bit(flag, &q->queue_flags);
695}
696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
698#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100699#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
Bart Van Asschec246e802012-12-06 14:32:01 +0100700#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
Tejun Heod7325802012-03-05 13:14:58 -0800701#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
Jens Axboe320ae512013-10-24 09:20:05 +0100702#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200703#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100704#define blk_queue_noxmerges(q) \
705 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
Jens Axboea68bbddba2008-09-24 13:03:33 +0200706#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
Jens Axboebc58ba92009-01-23 10:54:44 +0100707#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
Jens Axboee2e1a142010-06-09 10:42:09 +0200708#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
Kiyoshi Ueda4ee5eaf2008-09-18 10:46:13 -0400709#define blk_queue_stackable(q) \
710 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
Christoph Hellwigc15227d2009-09-30 13:52:12 +0200711#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
Christoph Hellwig288dab82016-06-09 16:00:36 +0200712#define blk_queue_secure_erase(q) \
713 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
Toshi Kani163d4ba2016-06-23 17:05:50 -0400714#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200716#define blk_noretry_request(rq) \
717 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
718 REQ_FAILFAST_DRIVER))
Jens Axboe4aff5e22006-08-10 08:44:47 +0200719
Christoph Hellwig57292b52017-01-31 16:57:29 +0100720static inline bool blk_account_rq(struct request *rq)
721{
722 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
723}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
Jens Axboeab780f12008-08-26 10:25:02 +0200725#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
FUJITA Tomonoriabae1fd2007-07-16 08:52:14 +0200726#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
Kiyoshi Ueda336cdb42007-12-11 17:40:30 -0500727/* rq->queuelist of dequeued request must be list_empty() */
728#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
731
Mike Christie4e1b2d522016-06-05 14:32:22 -0500732#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Jens Axboe49fd5242014-04-16 10:57:18 -0600734/*
735 * Driver can handle struct request, if it either has an old style
736 * request_fn defined, or is blk-mq based.
737 */
738static inline bool queue_is_rq_based(struct request_queue *q)
739{
740 return q->request_fn || q->mq_ops;
741}
742
Martin K. Petersene692cb62010-12-01 19:41:49 +0100743static inline unsigned int blk_queue_cluster(struct request_queue *q)
744{
745 return q->limits.cluster;
746}
747
Damien Le Moal797476b2016-10-18 15:40:29 +0900748static inline enum blk_zoned_model
749blk_queue_zoned_model(struct request_queue *q)
750{
751 return q->limits.zoned;
752}
753
754static inline bool blk_queue_is_zoned(struct request_queue *q)
755{
756 switch (blk_queue_zoned_model(q)) {
757 case BLK_ZONED_HA:
758 case BLK_ZONED_HM:
759 return true;
760 default:
761 return false;
762 }
763}
764
Damien Le Moalf99e8642017-01-12 07:58:32 -0700765static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +0900766{
767 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
768}
769
Jens Axboe1faa16d2009-04-06 14:48:01 +0200770static inline bool rq_is_sync(struct request *rq)
771{
Christoph Hellwigef295ec2016-10-28 08:48:16 -0600772 return op_is_sync(rq->cmd_flags);
Jens Axboe1faa16d2009-04-06 14:48:01 +0200773}
774
Tejun Heo5b788ce2012-06-04 20:40:59 -0700775static inline bool blk_rl_full(struct request_list *rl, bool sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
Tejun Heo5b788ce2012-06-04 20:40:59 -0700777 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
778
779 return rl->flags & flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
Tejun Heo5b788ce2012-06-04 20:40:59 -0700782static inline void blk_set_rl_full(struct request_list *rl, bool sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
Tejun Heo5b788ce2012-06-04 20:40:59 -0700784 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
785
786 rl->flags |= flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787}
788
Tejun Heo5b788ce2012-06-04 20:40:59 -0700789static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
Tejun Heo5b788ce2012-06-04 20:40:59 -0700791 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
792
793 rl->flags &= ~flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794}
795
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400796static inline bool rq_mergeable(struct request *rq)
797{
Christoph Hellwig57292b52017-01-31 16:57:29 +0100798 if (blk_rq_is_passthrough(rq))
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400799 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Mike Christie3a5e02c2016-06-05 14:32:23 -0500801 if (req_op(rq) == REQ_OP_FLUSH)
802 return false;
803
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800804 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
805 return false;
806
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400807 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
808 return false;
Christoph Hellwige8064022016-10-20 15:12:13 +0200809 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
810 return false;
Martin K. Petersene2a60da2012-09-18 12:19:25 -0400811
812 return true;
813}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400815static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
816{
817 if (bio_data(a) == bio_data(b))
818 return true;
819
820 return false;
821}
822
Jens Axboed278d4a2016-03-30 10:21:08 -0600823static inline unsigned int blk_queue_depth(struct request_queue *q)
824{
825 if (q->queue_depth)
826 return q->queue_depth;
827
828 return q->nr_requests;
829}
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 * q->prep_rq_fn return values
833 */
Martin K. Petersen0fb5b1f2016-02-04 00:52:12 -0500834enum {
835 BLKPREP_OK, /* serve it */
836 BLKPREP_KILL, /* fatal error, kill, return -EIO */
837 BLKPREP_DEFER, /* leave on queue */
838 BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
839};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
841extern unsigned long blk_max_low_pfn, blk_max_pfn;
842
843/*
844 * standard bounce addresses:
845 *
846 * BLK_BOUNCE_HIGH : bounce all highmem pages
847 * BLK_BOUNCE_ANY : don't bounce anything
848 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
849 */
Andi Kleen24728922008-04-21 09:51:05 +0200850
851#if BITS_PER_LONG == 32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
Andi Kleen24728922008-04-21 09:51:05 +0200853#else
854#define BLK_BOUNCE_HIGH -1ULL
855#endif
856#define BLK_BOUNCE_ANY (-1ULL)
FUJITA Tomonoribfe17232010-05-31 15:59:03 +0900857#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Jens Axboe3d6392c2007-07-09 12:38:05 +0200859/*
860 * default timeout for SG_IO if none specified
861 */
862#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
Linus Torvaldsf2f1fa72008-12-05 14:49:18 -0800863#define BLK_MIN_SG_TIMEOUT (7 * HZ)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200864
Christoph Lameter2a7326b2007-07-17 04:03:37 -0700865#ifdef CONFIG_BOUNCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866extern int init_emergency_isa_pool(void);
Jens Axboe165125e2007-07-24 09:28:11 +0200867extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868#else
869static inline int init_emergency_isa_pool(void)
870{
871 return 0;
872}
Jens Axboe165125e2007-07-24 09:28:11 +0200873static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874{
875}
876#endif /* CONFIG_MMU */
877
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900878struct rq_map_data {
879 struct page **pages;
880 int page_order;
881 int nr_entries;
FUJITA Tomonori56c451f2008-12-18 14:49:37 +0900882 unsigned long offset;
FUJITA Tomonori97ae77a2008-12-18 14:49:38 +0900883 int null_mapped;
FUJITA Tomonoriecb554a2009-07-09 14:46:53 +0200884 int from_user;
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900885};
886
NeilBrown5705f702007-09-25 12:35:59 +0200887struct req_iterator {
Kent Overstreet79886132013-11-23 17:19:00 -0800888 struct bvec_iter iter;
NeilBrown5705f702007-09-25 12:35:59 +0200889 struct bio *bio;
890};
891
892/* This should not be used directly - use rq_for_each_segment */
Jens Axboe1e428072009-02-23 09:03:10 +0100893#define for_each_bio(_bio) \
894 for (; _bio; _bio = _bio->bi_next)
NeilBrown5705f702007-09-25 12:35:59 +0200895#define __rq_for_each_bio(_bio, rq) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 if ((rq->bio)) \
897 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
898
NeilBrown5705f702007-09-25 12:35:59 +0200899#define rq_for_each_segment(bvl, _rq, _iter) \
900 __rq_for_each_bio(_iter.bio, _rq) \
Kent Overstreet79886132013-11-23 17:19:00 -0800901 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
NeilBrown5705f702007-09-25 12:35:59 +0200902
Kent Overstreet4550dd62013-08-07 14:26:21 -0700903#define rq_iter_last(bvec, _iter) \
Kent Overstreet79886132013-11-23 17:19:00 -0800904 (_iter.bio->bi_next == NULL && \
Kent Overstreet4550dd62013-08-07 14:26:21 -0700905 bio_iter_last(bvec, _iter.iter))
NeilBrown5705f702007-09-25 12:35:59 +0200906
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100907#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
908# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
909#endif
910#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
911extern void rq_flush_dcache_pages(struct request *rq);
912#else
913static inline void rq_flush_dcache_pages(struct request *rq)
914{
915}
916#endif
917
Toshi Kani2af3a812016-05-10 10:23:52 -0600918#ifdef CONFIG_PRINTK
919#define vfs_msg(sb, level, fmt, ...) \
920 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
921#else
922#define vfs_msg(sb, level, fmt, ...) \
923do { \
924 no_printk(fmt, ##__VA_ARGS__); \
925 __vfs_msg(sb, "", " "); \
926} while (0)
927#endif
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929extern int blk_register_queue(struct gendisk *disk);
930extern void blk_unregister_queue(struct gendisk *disk);
Jens Axboedece1632015-11-05 10:41:16 -0700931extern blk_qc_t generic_make_request(struct bio *bio);
FUJITA Tomonori2a4aa302008-04-29 09:54:36 +0200932extern void blk_rq_init(struct request_queue *q, struct request *rq);
Bart Van Asscheda8d7f02017-04-19 14:01:24 -0700933extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934extern void blk_put_request(struct request *);
Jens Axboe165125e2007-07-24 09:28:11 +0200935extern void __blk_put_request(struct request_queue *, struct request *);
Jens Axboe165125e2007-07-24 09:28:11 +0200936extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
Jens Axboe165125e2007-07-24 09:28:11 +0200937extern void blk_requeue_request(struct request_queue *, struct request *);
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +0200938extern int blk_lld_busy(struct request_queue *q);
Mike Snitzer78d8e582015-06-26 10:01:13 -0400939extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
940 struct bio_set *bs, gfp_t gfp_mask,
941 int (*bio_ctr)(struct bio *, struct bio *, void *),
942 void *data);
943extern void blk_rq_unprep_clone(struct request *rq);
Kiyoshi Ueda82124d62008-09-18 10:45:38 -0400944extern int blk_insert_cloned_request(struct request_queue *q,
945 struct request *rq);
Christoph Hellwig98d61d52016-07-19 11:31:51 +0200946extern int blk_rq_append_bio(struct request *rq, struct bio *bio);
Jens Axboe3cca6dc2011-03-02 11:08:00 -0500947extern void blk_delay_queue(struct request_queue *, unsigned long);
Kent Overstreet54efd502015-04-23 22:37:18 -0700948extern void blk_queue_split(struct request_queue *, struct bio **,
949 struct bio_set *);
Jens Axboe165125e2007-07-24 09:28:11 +0200950extern void blk_recount_segments(struct request_queue *, struct bio *);
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100951extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100952extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
953 unsigned int, void __user *);
Al Viro74f3c8a2007-08-27 15:38:10 -0400954extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
955 unsigned int, void __user *);
Al Viroe915e872008-09-02 17:16:41 -0400956extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
957 struct scsi_ioctl_command __user *);
Andrew Morton3fcfab12006-10-19 23:28:16 -0700958
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100959extern int blk_queue_enter(struct request_queue *q, bool nowait);
Dan Williams2e6edc952015-11-19 13:29:28 -0800960extern void blk_queue_exit(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200961extern void blk_start_queue(struct request_queue *q);
Jens Axboe21491412015-12-28 13:01:22 -0700962extern void blk_start_queue_async(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200963extern void blk_stop_queue(struct request_queue *q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964extern void blk_sync_queue(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200965extern void __blk_stop_queue(struct request_queue *q);
Christoph Hellwig24ecfbe2011-04-18 11:41:33 +0200966extern void __blk_run_queue(struct request_queue *q);
Christoph Hellwiga7928c152015-04-17 22:37:20 +0200967extern void __blk_run_queue_uncond(struct request_queue *q);
Jens Axboe165125e2007-07-24 09:28:11 +0200968extern void blk_run_queue(struct request_queue *);
Jens Axboec21e6be2011-04-19 13:32:46 +0200969extern void blk_run_queue_async(struct request_queue *q);
Bart Van Assche6a83e742016-11-02 10:09:51 -0600970extern void blk_mq_quiesce_queue(struct request_queue *q);
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900971extern int blk_rq_map_user(struct request_queue *, struct request *,
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900972 struct rq_map_data *, void __user *, unsigned long,
973 gfp_t);
Jens Axboe8e5cfc42006-12-19 11:12:46 +0100974extern int blk_rq_unmap_user(struct bio *);
Jens Axboe165125e2007-07-24 09:28:11 +0200975extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
976extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
Kent Overstreet26e49cf2015-01-18 16:16:31 +0100977 struct rq_map_data *, const struct iov_iter *,
978 gfp_t);
Christoph Hellwigb7819b92017-04-20 16:02:55 +0200979extern void blk_execute_rq(struct request_queue *, struct gendisk *,
James Bottomley 994ca9a2005-06-20 14:11:09 +0200980 struct request *, int);
Jens Axboe165125e2007-07-24 09:28:11 +0200981extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
Jens Axboe15fc8582006-01-06 10:00:50 +0100982 struct request *, int, rq_end_io_fn *);
Mike Christie6e39b69e2005-11-11 05:30:24 -0600983
Jens Axboebbd7bb72016-11-04 09:34:34 -0600984bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
Jens Axboe05229beed2015-11-05 10:44:55 -0700985
Jens Axboe165125e2007-07-24 09:28:11 +0200986static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
Tejun Heoff9ea322014-09-08 08:03:56 +0900988 return bdev->bd_disk->queue; /* this is never NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989}
990
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991/*
Tejun Heo80a761f2009-07-03 17:48:17 +0900992 * blk_rq_pos() : the current sector
993 * blk_rq_bytes() : bytes left in the entire request
994 * blk_rq_cur_bytes() : bytes left in the current segment
995 * blk_rq_err_bytes() : bytes left till the next error boundary
996 * blk_rq_sectors() : sectors left in the entire request
997 * blk_rq_cur_sectors() : sectors left in the current segment
Tejun Heo5efccd12009-04-23 11:05:18 +0900998 */
Tejun Heo5b936292009-05-07 22:24:38 +0900999static inline sector_t blk_rq_pos(const struct request *rq)
1000{
Tejun Heoa2dec7b2009-05-07 22:24:44 +09001001 return rq->__sector;
Tejun Heo5b936292009-05-07 22:24:38 +09001002}
1003
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001004static inline unsigned int blk_rq_bytes(const struct request *rq)
1005{
Tejun Heoa2dec7b2009-05-07 22:24:44 +09001006 return rq->__data_len;
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001007}
1008
1009static inline int blk_rq_cur_bytes(const struct request *rq)
1010{
1011 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1012}
Tejun Heo5efccd12009-04-23 11:05:18 +09001013
Tejun Heo80a761f2009-07-03 17:48:17 +09001014extern unsigned int blk_rq_err_bytes(const struct request *rq);
1015
Tejun Heo5b936292009-05-07 22:24:38 +09001016static inline unsigned int blk_rq_sectors(const struct request *rq)
1017{
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001018 return blk_rq_bytes(rq) >> 9;
Tejun Heo5b936292009-05-07 22:24:38 +09001019}
1020
1021static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1022{
Tejun Heo2e46e8b2009-05-07 22:24:41 +09001023 return blk_rq_cur_bytes(rq) >> 9;
Tejun Heo5b936292009-05-07 22:24:38 +09001024}
1025
Christoph Hellwig2e3258e2017-01-13 12:29:10 +01001026/*
1027 * Some commands like WRITE SAME have a payload or data transfer size which
1028 * is different from the size of the request. Any driver that supports such
1029 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1030 * calculate the data transfer size.
1031 */
1032static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1033{
1034 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1035 return rq->special_vec.bv_len;
1036 return blk_rq_bytes(rq);
1037}
1038
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001039static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
Mike Christie8fe0d472016-06-05 14:32:15 -05001040 int op)
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001041{
Adrian Hunter7afafc82016-08-16 10:59:35 +03001042 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
James Bottomley871dd922013-04-24 08:52:50 -06001043 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001044
Mike Christie8fe0d472016-06-05 14:32:15 -05001045 if (unlikely(op == REQ_OP_WRITE_SAME))
Martin K. Petersen4363ac72012-09-18 12:19:27 -04001046 return q->limits.max_write_same_sectors;
1047
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -08001048 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1049 return q->limits.max_write_zeroes_sectors;
1050
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001051 return q->limits.max_sectors;
1052}
1053
Jens Axboe762380a2014-06-05 13:38:39 -06001054/*
1055 * Return maximum size of a request at given offset. Only valid for
1056 * file system requests.
1057 */
1058static inline unsigned int blk_max_size_offset(struct request_queue *q,
1059 sector_t offset)
1060{
1061 if (!q->limits.chunk_sectors)
Jens Axboe736ed4d2014-06-17 22:09:29 -07001062 return q->limits.max_sectors;
Jens Axboe762380a2014-06-05 13:38:39 -06001063
1064 return q->limits.chunk_sectors -
1065 (offset & (q->limits.chunk_sectors - 1));
1066}
1067
Damien Le Moal17007f32016-07-20 21:40:47 -06001068static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1069 sector_t offset)
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001070{
1071 struct request_queue *q = rq->q;
1072
Christoph Hellwig57292b52017-01-31 16:57:29 +01001073 if (blk_rq_is_passthrough(rq))
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001074 return q->limits.max_hw_sectors;
1075
Adrian Hunter7afafc82016-08-16 10:59:35 +03001076 if (!q->limits.chunk_sectors ||
1077 req_op(rq) == REQ_OP_DISCARD ||
1078 req_op(rq) == REQ_OP_SECURE_ERASE)
Mike Christie8fe0d472016-06-05 14:32:15 -05001079 return blk_queue_get_max_sectors(q, req_op(rq));
Jens Axboe762380a2014-06-05 13:38:39 -06001080
Damien Le Moal17007f32016-07-20 21:40:47 -06001081 return min(blk_max_size_offset(q, offset),
Mike Christie8fe0d472016-06-05 14:32:15 -05001082 blk_queue_get_max_sectors(q, req_op(rq)));
Martin K. Petersenf31dc1c2012-09-18 12:19:26 -04001083}
1084
Jun'ichi Nomura75afb352013-09-21 13:57:47 -06001085static inline unsigned int blk_rq_count_bios(struct request *rq)
1086{
1087 unsigned int nr_bios = 0;
1088 struct bio *bio;
1089
1090 __rq_for_each_bio(bio, rq)
1091 nr_bios++;
1092
1093 return nr_bios;
1094}
1095
Tejun Heo5efccd12009-04-23 11:05:18 +09001096/*
Tejun Heo9934c8c2009-05-08 11:54:16 +09001097 * Request issue related functions.
1098 */
1099extern struct request *blk_peek_request(struct request_queue *q);
1100extern void blk_start_request(struct request *rq);
1101extern struct request *blk_fetch_request(struct request_queue *q);
1102
1103/*
Tejun Heo2e60e022009-04-23 11:05:18 +09001104 * Request completion related functions.
1105 *
1106 * blk_update_request() completes given number of bytes and updates
1107 * the request without completing it.
1108 *
Tejun Heof06d9a22009-04-23 11:05:19 +09001109 * blk_end_request() and friends. __blk_end_request() must be called
1110 * with the request queue spinlock acquired.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 *
1112 * Several drivers define their own end_request and call
Kiyoshi Ueda3bcddea2007-12-11 17:52:28 -05001113 * blk_end_request() for parts of the original function.
1114 * This prevents code duplication in drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 */
Tejun Heo2e60e022009-04-23 11:05:18 +09001116extern bool blk_update_request(struct request *rq, int error,
1117 unsigned int nr_bytes);
Christoph Hellwig12120072014-04-16 09:44:59 +02001118extern void blk_finish_request(struct request *rq, int error);
FUJITA Tomonorib1f74492009-05-11 17:56:09 +09001119extern bool blk_end_request(struct request *rq, int error,
1120 unsigned int nr_bytes);
1121extern void blk_end_request_all(struct request *rq, int error);
FUJITA Tomonorib1f74492009-05-11 17:56:09 +09001122extern bool __blk_end_request(struct request *rq, int error,
1123 unsigned int nr_bytes);
1124extern void __blk_end_request_all(struct request *rq, int error);
1125extern bool __blk_end_request_cur(struct request *rq, int error);
Tejun Heo2e60e022009-04-23 11:05:18 +09001126
Jens Axboeff856ba2006-01-09 16:02:34 +01001127extern void blk_complete_request(struct request *);
Jens Axboe242f9dc2008-09-14 05:55:09 -07001128extern void __blk_complete_request(struct request *);
1129extern void blk_abort_request(struct request *);
James Bottomley28018c22010-07-01 19:49:17 +09001130extern void blk_unprep_request(struct request *);
Jens Axboeff856ba2006-01-09 16:02:34 +01001131
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 * Access functions for manipulating queue properties
1134 */
Jens Axboe165125e2007-07-24 09:28:11 +02001135extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
Christoph Lameter19460892005-06-23 00:08:19 -07001136 spinlock_t *lock, int node_id);
Jens Axboe165125e2007-07-24 09:28:11 +02001137extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
Christoph Hellwig5ea708d2017-01-03 14:52:44 +03001138extern int blk_init_allocated_queue(struct request_queue *);
Jens Axboe165125e2007-07-24 09:28:11 +02001139extern void blk_cleanup_queue(struct request_queue *);
1140extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1141extern void blk_queue_bounce_limit(struct request_queue *, u64);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -05001142extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
Jens Axboe762380a2014-06-05 13:38:39 -06001143extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
Martin K. Petersen8a783622010-02-26 00:20:39 -05001144extern void blk_queue_max_segments(struct request_queue *, unsigned short);
Christoph Hellwig1e739732017-02-08 14:46:49 +01001145extern void blk_queue_max_discard_segments(struct request_queue *,
1146 unsigned short);
Jens Axboe165125e2007-07-24 09:28:11 +02001147extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
Christoph Hellwig67efc922009-09-30 13:54:20 +02001148extern void blk_queue_max_discard_sectors(struct request_queue *q,
1149 unsigned int max_discard_sectors);
Martin K. Petersen4363ac72012-09-18 12:19:27 -04001150extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1151 unsigned int max_write_same_sectors);
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -08001152extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1153 unsigned int max_write_same_sectors);
Martin K. Petersene1defc42009-05-22 17:17:49 -04001154extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
Martin K. Petersen892b6f92010-10-13 21:18:03 +02001155extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001156extern void blk_queue_alignment_offset(struct request_queue *q,
1157 unsigned int alignment);
Martin K. Petersen7c958e32009-07-31 11:49:11 -04001158extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001159extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
Martin K. Petersen3c5820c2009-09-11 21:54:52 +02001160extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001161extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
Jens Axboed278d4a2016-03-30 10:21:08 -06001162extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
Martin K. Petersene475bba2009-06-16 08:23:52 +02001163extern void blk_set_default_limits(struct queue_limits *lim);
Martin K. Petersenb1bd0552012-01-11 16:27:11 +01001164extern void blk_set_stacking_limits(struct queue_limits *lim);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001165extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1166 sector_t offset);
Martin K. Petersen17be8c22010-01-11 03:21:49 -05001167extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1168 sector_t offset);
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001169extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1170 sector_t offset);
Jens Axboe165125e2007-07-24 09:28:11 +02001171extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
Tejun Heoe3790c72008-03-04 11:18:17 +01001172extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
FUJITA Tomonori27f82212008-07-04 09:30:03 +02001173extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
Tejun Heo2fb98e82008-02-19 11:36:53 +01001174extern int blk_queue_dma_drain(struct request_queue *q,
1175 dma_drain_needed_fn *dma_drain_needed,
1176 void *buf, unsigned int size);
Kiyoshi Uedaef9e3fa2008-10-01 16:12:15 +02001177extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
Jens Axboe165125e2007-07-24 09:28:11 +02001178extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
Keith Busch03100aa2015-08-19 14:24:05 -07001179extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
Jens Axboe165125e2007-07-24 09:28:11 +02001180extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
James Bottomley28018c22010-07-01 19:49:17 +09001181extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
Jens Axboe165125e2007-07-24 09:28:11 +02001182extern void blk_queue_dma_alignment(struct request_queue *, int);
James Bottomley11c3e682007-12-31 16:37:00 -06001183extern void blk_queue_update_dma_alignment(struct request_queue *, int);
Jens Axboe165125e2007-07-24 09:28:11 +02001184extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
Jens Axboe242f9dc2008-09-14 05:55:09 -07001185extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1186extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
shaohua.li@intel.comf3876932011-05-06 11:34:32 -06001187extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
Jens Axboe93e9d8e2016-04-12 12:32:46 -06001188extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
Christoph Hellwig1e739732017-02-08 14:46:49 +01001190/*
1191 * Number of physical segments as sent to the device.
1192 *
1193 * Normally this is the number of discontiguous data segments sent by the
1194 * submitter. But for data-less command like discard we might have no
1195 * actual data segments submitted, but the driver might have to add it's
1196 * own special payload. In that case we still return 1 here so that this
1197 * special payload will be mapped.
1198 */
Christoph Hellwigf9d03f92016-12-08 15:20:32 -07001199static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1200{
1201 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1202 return 1;
1203 return rq->nr_phys_segments;
1204}
1205
Christoph Hellwig1e739732017-02-08 14:46:49 +01001206/*
1207 * Number of discard segments (or ranges) the driver needs to fill in.
1208 * Each discard bio merged into a request is counted as one segment.
1209 */
1210static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1211{
1212 return max_t(unsigned short, rq->nr_phys_segments, 1);
1213}
1214
Jens Axboe165125e2007-07-24 09:28:11 +02001215extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216extern void blk_dump_rq_flags(struct request *, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217extern long nr_blockdev_pages(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
Tejun Heo09ac46c2011-12-14 00:33:38 +01001219bool __must_check blk_get_queue(struct request_queue *);
Jens Axboe165125e2007-07-24 09:28:11 +02001220struct request_queue *blk_alloc_queue(gfp_t);
1221struct request_queue *blk_alloc_queue_node(gfp_t, int);
1222extern void blk_put_queue(struct request_queue *);
Jens Axboe3f21c262015-06-05 10:57:37 -06001223extern void blk_set_queue_dying(struct request_queue *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
Shaohua Li316cc672011-07-08 08:19:21 +02001225/*
Lin Ming6c954662013-03-23 11:42:26 +08001226 * block layer runtime pm functions
1227 */
Rafael J. Wysocki47fafbc2014-12-04 01:00:23 +01001228#ifdef CONFIG_PM
Lin Ming6c954662013-03-23 11:42:26 +08001229extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1230extern int blk_pre_runtime_suspend(struct request_queue *q);
1231extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1232extern void blk_pre_runtime_resume(struct request_queue *q);
1233extern void blk_post_runtime_resume(struct request_queue *q, int err);
Mika Westerbergd07ab6d2016-02-18 10:54:11 +02001234extern void blk_set_runtime_active(struct request_queue *q);
Lin Ming6c954662013-03-23 11:42:26 +08001235#else
1236static inline void blk_pm_runtime_init(struct request_queue *q,
1237 struct device *dev) {}
1238static inline int blk_pre_runtime_suspend(struct request_queue *q)
1239{
1240 return -ENOSYS;
1241}
1242static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1243static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1244static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
Tobias Klauser9a05e752016-11-18 15:16:06 +01001245static inline void blk_set_runtime_active(struct request_queue *q) {}
Lin Ming6c954662013-03-23 11:42:26 +08001246#endif
1247
1248/*
Suresh Jayaraman75df7132011-09-21 10:00:16 +02001249 * blk_plug permits building a queue of related requests by holding the I/O
1250 * fragments for a short period. This allows merging of sequential requests
1251 * into single larger request. As the requests are moved from a per-task list to
1252 * the device's request_queue in a batch, this results in improved scalability
1253 * as the lock contention for request_queue lock is reduced.
1254 *
1255 * It is ok not to disable preemption when adding the request to the plug list
1256 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1257 * the plug list when the task sleeps by itself. For details, please see
1258 * schedule() where blk_schedule_flush_plug() is called.
Shaohua Li316cc672011-07-08 08:19:21 +02001259 */
Jens Axboe73c10102011-03-08 13:19:51 +01001260struct blk_plug {
Suresh Jayaraman75df7132011-09-21 10:00:16 +02001261 struct list_head list; /* requests */
Jens Axboe320ae512013-10-24 09:20:05 +01001262 struct list_head mq_list; /* blk-mq requests */
Suresh Jayaraman75df7132011-09-21 10:00:16 +02001263 struct list_head cb_list; /* md requires an unplug callback */
Jens Axboe73c10102011-03-08 13:19:51 +01001264};
Shaohua Li55c022b2011-07-08 08:19:20 +02001265#define BLK_MAX_REQUEST_COUNT 16
Shaohua Li50d24c32016-11-03 17:03:53 -07001266#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
Shaohua Li55c022b2011-07-08 08:19:20 +02001267
NeilBrown9cbb1752012-07-31 09:08:14 +02001268struct blk_plug_cb;
NeilBrown74018dc2012-07-31 09:08:15 +02001269typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
NeilBrown048c9372011-04-18 09:52:22 +02001270struct blk_plug_cb {
1271 struct list_head list;
NeilBrown9cbb1752012-07-31 09:08:14 +02001272 blk_plug_cb_fn callback;
1273 void *data;
NeilBrown048c9372011-04-18 09:52:22 +02001274};
NeilBrown9cbb1752012-07-31 09:08:14 +02001275extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1276 void *data, int size);
Jens Axboe73c10102011-03-08 13:19:51 +01001277extern void blk_start_plug(struct blk_plug *);
1278extern void blk_finish_plug(struct blk_plug *);
Jens Axboef6603782011-04-15 15:49:07 +02001279extern void blk_flush_plug_list(struct blk_plug *, bool);
Jens Axboe73c10102011-03-08 13:19:51 +01001280
1281static inline void blk_flush_plug(struct task_struct *tsk)
1282{
1283 struct blk_plug *plug = tsk->plug;
1284
Christoph Hellwig88b996c2011-04-15 15:20:10 +02001285 if (plug)
Jens Axboea237c1c2011-04-16 13:27:55 +02001286 blk_flush_plug_list(plug, false);
1287}
1288
1289static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1290{
1291 struct blk_plug *plug = tsk->plug;
1292
1293 if (plug)
Jens Axboef6603782011-04-15 15:49:07 +02001294 blk_flush_plug_list(plug, true);
Jens Axboe73c10102011-03-08 13:19:51 +01001295}
1296
1297static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1298{
1299 struct blk_plug *plug = tsk->plug;
1300
Jens Axboe320ae512013-10-24 09:20:05 +01001301 return plug &&
1302 (!list_empty(&plug->list) ||
1303 !list_empty(&plug->mq_list) ||
1304 !list_empty(&plug->cb_list));
Jens Axboe73c10102011-03-08 13:19:51 +01001305}
1306
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307/*
1308 * tag stuff
1309 */
Jens Axboe165125e2007-07-24 09:28:11 +02001310extern int blk_queue_start_tag(struct request_queue *, struct request *);
1311extern struct request *blk_queue_find_tag(struct request_queue *, int);
1312extern void blk_queue_end_tag(struct request_queue *, struct request *);
Shaohua Liee1b6f72015-01-15 17:32:25 -08001313extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
Jens Axboe165125e2007-07-24 09:28:11 +02001314extern void blk_queue_free_tags(struct request_queue *);
1315extern int blk_queue_resize_tags(struct request_queue *, int);
1316extern void blk_queue_invalidate_tags(struct request_queue *);
Shaohua Liee1b6f72015-01-15 17:32:25 -08001317extern struct blk_queue_tag *blk_init_tags(int, int);
James Bottomley492dfb42006-08-30 15:48:45 -04001318extern void blk_free_tags(struct blk_queue_tag *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319
David C Somayajuluf583f492006-10-04 08:27:25 +02001320static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1321 int tag)
1322{
1323 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1324 return NULL;
1325 return bqt->tag_index[tag];
1326}
Christoph Hellwigdd3932e2010-09-16 20:51:46 +02001327
Christoph Hellwigee472d82017-04-05 19:21:08 +02001328extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1329extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1330 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
Christoph Hellwige950fdf2016-07-19 11:23:33 +02001331
1332#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
Christoph Hellwigdd3932e2010-09-16 20:51:46 +02001333
Dmitry Monakhovfbd9b092010-04-28 17:55:06 +04001334extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1335 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
Christoph Hellwig38f25252016-04-16 14:55:28 -04001336extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
Christoph Hellwig288dab82016-06-09 16:00:36 +02001337 sector_t nr_sects, gfp_t gfp_mask, int flags,
Mike Christie469e3212016-06-05 14:31:49 -05001338 struct bio **biop);
Christoph Hellwigee472d82017-04-05 19:21:08 +02001339
1340#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
Christoph Hellwigcb365b92017-04-05 19:21:10 +02001341#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
Christoph Hellwigee472d82017-04-05 19:21:08 +02001342
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -08001343extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1344 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
Christoph Hellwigee472d82017-04-05 19:21:08 +02001345 unsigned flags);
Dmitry Monakhov3f14d792010-04-28 17:55:09 +04001346extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
Christoph Hellwigee472d82017-04-05 19:21:08 +02001347 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1348
Christoph Hellwig2cf6d262010-08-18 05:29:10 -04001349static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1350 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
David Woodhousefb2dce82008-08-05 18:01:53 +01001351{
Christoph Hellwig2cf6d262010-08-18 05:29:10 -04001352 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1353 nr_blocks << (sb->s_blocksize_bits - 9),
1354 gfp_mask, flags);
David Woodhousefb2dce82008-08-05 18:01:53 +01001355}
Lukas Czernere6fa0be2010-10-27 21:30:04 -04001356static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
Theodore Ts'oa107e5a2010-10-27 23:44:47 -04001357 sector_t nr_blocks, gfp_t gfp_mask)
Lukas Czernere6fa0be2010-10-27 21:30:04 -04001358{
1359 return blkdev_issue_zeroout(sb->s_bdev,
1360 block << (sb->s_blocksize_bits - 9),
1361 nr_blocks << (sb->s_blocksize_bits - 9),
Christoph Hellwigee472d82017-04-05 19:21:08 +02001362 gfp_mask, 0);
Lukas Czernere6fa0be2010-10-27 21:30:04 -04001363}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
Jens Axboe018e0442009-06-26 16:27:10 +02001365extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
Adel Gadllah0b07de82008-06-26 13:48:27 +02001366
Martin K. Peterseneb28d312010-02-26 00:20:37 -05001367enum blk_default_limits {
1368 BLK_MAX_SEGMENTS = 128,
1369 BLK_SAFE_MAX_SECTORS = 255,
Jeff Moyerd2be5372015-08-13 14:57:57 -04001370 BLK_DEF_MAX_SECTORS = 2560,
Martin K. Peterseneb28d312010-02-26 00:20:37 -05001371 BLK_MAX_SEGMENT_SIZE = 65536,
1372 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1373};
Milan Broz0e435ac2008-12-03 12:55:08 +01001374
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1376
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001377static inline unsigned long queue_bounce_pfn(struct request_queue *q)
1378{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001379 return q->limits.bounce_pfn;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001380}
1381
1382static inline unsigned long queue_segment_boundary(struct request_queue *q)
1383{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001384 return q->limits.seg_boundary_mask;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001385}
1386
Keith Busch03100aa2015-08-19 14:24:05 -07001387static inline unsigned long queue_virt_boundary(struct request_queue *q)
1388{
1389 return q->limits.virt_boundary_mask;
1390}
1391
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001392static inline unsigned int queue_max_sectors(struct request_queue *q)
1393{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001394 return q->limits.max_sectors;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001395}
1396
1397static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1398{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001399 return q->limits.max_hw_sectors;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001400}
1401
Martin K. Petersen8a783622010-02-26 00:20:39 -05001402static inline unsigned short queue_max_segments(struct request_queue *q)
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001403{
Martin K. Petersen8a783622010-02-26 00:20:39 -05001404 return q->limits.max_segments;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001405}
1406
Christoph Hellwig1e739732017-02-08 14:46:49 +01001407static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1408{
1409 return q->limits.max_discard_segments;
1410}
1411
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001412static inline unsigned int queue_max_segment_size(struct request_queue *q)
1413{
Martin K. Petersen025146e2009-05-22 17:17:51 -04001414 return q->limits.max_segment_size;
Martin K. Petersenae03bf62009-05-22 17:17:50 -04001415}
1416
Martin K. Petersene1defc42009-05-22 17:17:49 -04001417static inline unsigned short queue_logical_block_size(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418{
1419 int retval = 512;
1420
Martin K. Petersen025146e2009-05-22 17:17:51 -04001421 if (q && q->limits.logical_block_size)
1422 retval = q->limits.logical_block_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
1424 return retval;
1425}
1426
Martin K. Petersene1defc42009-05-22 17:17:49 -04001427static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428{
Martin K. Petersene1defc42009-05-22 17:17:49 -04001429 return queue_logical_block_size(bdev_get_queue(bdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430}
1431
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001432static inline unsigned int queue_physical_block_size(struct request_queue *q)
1433{
1434 return q->limits.physical_block_size;
1435}
1436
Martin K. Petersen892b6f92010-10-13 21:18:03 +02001437static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
Martin K. Petersenac481c22009-10-03 20:52:01 +02001438{
1439 return queue_physical_block_size(bdev_get_queue(bdev));
1440}
1441
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001442static inline unsigned int queue_io_min(struct request_queue *q)
1443{
1444 return q->limits.io_min;
1445}
1446
Martin K. Petersenac481c22009-10-03 20:52:01 +02001447static inline int bdev_io_min(struct block_device *bdev)
1448{
1449 return queue_io_min(bdev_get_queue(bdev));
1450}
1451
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001452static inline unsigned int queue_io_opt(struct request_queue *q)
1453{
1454 return q->limits.io_opt;
1455}
1456
Martin K. Petersenac481c22009-10-03 20:52:01 +02001457static inline int bdev_io_opt(struct block_device *bdev)
1458{
1459 return queue_io_opt(bdev_get_queue(bdev));
1460}
1461
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001462static inline int queue_alignment_offset(struct request_queue *q)
1463{
Martin K. Petersenac481c22009-10-03 20:52:01 +02001464 if (q->limits.misaligned)
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001465 return -1;
1466
Martin K. Petersenac481c22009-10-03 20:52:01 +02001467 return q->limits.alignment_offset;
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001468}
1469
Martin K. Petersene03a72e2010-01-11 03:21:51 -05001470static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
Martin K. Petersen81744ee2009-12-29 08:35:35 +01001471{
1472 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
Mike Snitzerb8839b82014-10-08 18:26:13 -04001473 unsigned int alignment = sector_div(sector, granularity >> 9) << 9;
Martin K. Petersen81744ee2009-12-29 08:35:35 +01001474
Mike Snitzerb8839b82014-10-08 18:26:13 -04001475 return (granularity + lim->alignment_offset - alignment) % granularity;
Martin K. Petersenc72758f2009-05-22 17:17:53 -04001476}
1477
Martin K. Petersenac481c22009-10-03 20:52:01 +02001478static inline int bdev_alignment_offset(struct block_device *bdev)
1479{
1480 struct request_queue *q = bdev_get_queue(bdev);
1481
1482 if (q->limits.misaligned)
1483 return -1;
1484
1485 if (bdev != bdev->bd_contains)
1486 return bdev->bd_part->alignment_offset;
1487
1488 return q->limits.alignment_offset;
1489}
1490
Martin K. Petersen86b37282009-11-10 11:50:21 +01001491static inline int queue_discard_alignment(struct request_queue *q)
1492{
1493 if (q->limits.discard_misaligned)
1494 return -1;
1495
1496 return q->limits.discard_alignment;
1497}
1498
Martin K. Petersene03a72e2010-01-11 03:21:51 -05001499static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
Martin K. Petersen86b37282009-11-10 11:50:21 +01001500{
Linus Torvalds59771072012-12-19 07:18:35 -08001501 unsigned int alignment, granularity, offset;
Martin K. Petersendd3d1452010-01-11 03:21:48 -05001502
Martin K. Petersena934a002011-05-18 10:37:35 +02001503 if (!lim->max_discard_sectors)
1504 return 0;
1505
Linus Torvalds59771072012-12-19 07:18:35 -08001506 /* Why are these in bytes, not sectors? */
1507 alignment = lim->discard_alignment >> 9;
1508 granularity = lim->discard_granularity >> 9;
1509 if (!granularity)
1510 return 0;
1511
1512 /* Offset of the partition start in 'granularity' sectors */
1513 offset = sector_div(sector, granularity);
1514
1515 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1516 offset = (granularity + alignment - offset) % granularity;
1517
1518 /* Turn it back into bytes, gaah */
1519 return offset << 9;
Martin K. Petersen86b37282009-11-10 11:50:21 +01001520}
1521
Paolo Bonzinic6e66632012-08-02 09:48:50 +02001522static inline int bdev_discard_alignment(struct block_device *bdev)
1523{
1524 struct request_queue *q = bdev_get_queue(bdev);
1525
1526 if (bdev != bdev->bd_contains)
1527 return bdev->bd_part->discard_alignment;
1528
1529 return q->limits.discard_alignment;
1530}
1531
Martin K. Petersen4363ac72012-09-18 12:19:27 -04001532static inline unsigned int bdev_write_same(struct block_device *bdev)
1533{
1534 struct request_queue *q = bdev_get_queue(bdev);
1535
1536 if (q)
1537 return q->limits.max_write_same_sectors;
1538
1539 return 0;
1540}
1541
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -08001542static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1543{
1544 struct request_queue *q = bdev_get_queue(bdev);
1545
1546 if (q)
1547 return q->limits.max_write_zeroes_sectors;
1548
1549 return 0;
1550}
1551
Damien Le Moal797476b2016-10-18 15:40:29 +09001552static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1553{
1554 struct request_queue *q = bdev_get_queue(bdev);
1555
1556 if (q)
1557 return blk_queue_zoned_model(q);
1558
1559 return BLK_ZONED_NONE;
1560}
1561
1562static inline bool bdev_is_zoned(struct block_device *bdev)
1563{
1564 struct request_queue *q = bdev_get_queue(bdev);
1565
1566 if (q)
1567 return blk_queue_is_zoned(q);
1568
1569 return false;
1570}
1571
Damien Le Moalf99e8642017-01-12 07:58:32 -07001572static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +09001573{
1574 struct request_queue *q = bdev_get_queue(bdev);
1575
1576 if (q)
Damien Le Moalf99e8642017-01-12 07:58:32 -07001577 return blk_queue_zone_sectors(q);
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +09001578
1579 return 0;
1580}
1581
Jens Axboe165125e2007-07-24 09:28:11 +02001582static inline int queue_dma_alignment(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583{
Pete Wyckoff482eb682008-01-01 10:23:02 -05001584 return q ? q->dma_alignment : 511;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585}
1586
Namhyung Kim14417792010-09-15 13:08:27 +02001587static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
FUJITA Tomonori87904072008-08-28 15:05:58 +09001588 unsigned int len)
1589{
1590 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
Namhyung Kim14417792010-09-15 13:08:27 +02001591 return !(addr & alignment) && !(len & alignment);
FUJITA Tomonori87904072008-08-28 15:05:58 +09001592}
1593
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594/* assumes size > 256 */
1595static inline unsigned int blksize_bits(unsigned int size)
1596{
1597 unsigned int bits = 8;
1598 do {
1599 bits++;
1600 size >>= 1;
1601 } while (size > 256);
1602 return bits;
1603}
1604
Adrian Bunk2befb9e2005-09-10 00:27:17 -07001605static inline unsigned int block_size(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606{
1607 return bdev->bd_block_size;
1608}
1609
shaohua.li@intel.comf3876932011-05-06 11:34:32 -06001610static inline bool queue_flush_queueable(struct request_queue *q)
1611{
Jens Axboec888a8f2016-04-13 13:33:19 -06001612 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
shaohua.li@intel.comf3876932011-05-06 11:34:32 -06001613}
1614
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615typedef struct {struct page *v;} Sector;
1616
1617unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1618
1619static inline void put_dev_sector(Sector p)
1620{
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001621 put_page(p.v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622}
1623
Ming Leie0af29172016-02-26 23:40:51 +08001624static inline bool __bvec_gap_to_prev(struct request_queue *q,
1625 struct bio_vec *bprv, unsigned int offset)
1626{
1627 return offset ||
1628 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
1629}
1630
Keith Busch03100aa2015-08-19 14:24:05 -07001631/*
1632 * Check if adding a bio_vec after bprv with offset would create a gap in
1633 * the SG list. Most drivers don't care about this, but some do.
1634 */
1635static inline bool bvec_gap_to_prev(struct request_queue *q,
1636 struct bio_vec *bprv, unsigned int offset)
1637{
1638 if (!queue_virt_boundary(q))
1639 return false;
Ming Leie0af29172016-02-26 23:40:51 +08001640 return __bvec_gap_to_prev(q, bprv, offset);
Keith Busch03100aa2015-08-19 14:24:05 -07001641}
1642
Ming Lei729204e2016-12-17 18:49:09 +08001643/*
1644 * Check if the two bvecs from two bios can be merged to one segment.
1645 * If yes, no need to check gap between the two bios since the 1st bio
1646 * and the 1st bvec in the 2nd bio can be handled in one segment.
1647 */
1648static inline bool bios_segs_mergeable(struct request_queue *q,
1649 struct bio *prev, struct bio_vec *prev_last_bv,
1650 struct bio_vec *next_first_bv)
1651{
1652 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv))
1653 return false;
1654 if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
1655 return false;
1656 if (prev->bi_seg_back_size + next_first_bv->bv_len >
1657 queue_max_segment_size(q))
1658 return false;
1659 return true;
1660}
1661
Ming Lei5a8d75a2017-04-14 13:58:29 -06001662static inline bool bio_will_gap(struct request_queue *q,
1663 struct request *prev_rq,
1664 struct bio *prev,
1665 struct bio *next)
Jens Axboe5e7c4272015-09-03 19:28:20 +03001666{
Ming Lei25e71a92016-02-26 23:40:52 +08001667 if (bio_has_data(prev) && queue_virt_boundary(q)) {
1668 struct bio_vec pb, nb;
Jens Axboe5e7c4272015-09-03 19:28:20 +03001669
Ming Lei5a8d75a2017-04-14 13:58:29 -06001670 /*
1671 * don't merge if the 1st bio starts with non-zero
1672 * offset, otherwise it is quite difficult to respect
1673 * sg gap limit. We work hard to merge a huge number of small
1674 * single bios in case of mkfs.
1675 */
1676 if (prev_rq)
1677 bio_get_first_bvec(prev_rq->bio, &pb);
1678 else
1679 bio_get_first_bvec(prev, &pb);
1680 if (pb.bv_offset)
1681 return true;
1682
1683 /*
1684 * We don't need to worry about the situation that the
1685 * merged segment ends in unaligned virt boundary:
1686 *
1687 * - if 'pb' ends aligned, the merged segment ends aligned
1688 * - if 'pb' ends unaligned, the next bio must include
1689 * one single bvec of 'nb', otherwise the 'nb' can't
1690 * merge with 'pb'
1691 */
Ming Lei25e71a92016-02-26 23:40:52 +08001692 bio_get_last_bvec(prev, &pb);
1693 bio_get_first_bvec(next, &nb);
1694
Ming Lei729204e2016-12-17 18:49:09 +08001695 if (!bios_segs_mergeable(q, prev, &pb, &nb))
1696 return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
Ming Lei25e71a92016-02-26 23:40:52 +08001697 }
1698
1699 return false;
Jens Axboe5e7c4272015-09-03 19:28:20 +03001700}
1701
1702static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
1703{
Ming Lei5a8d75a2017-04-14 13:58:29 -06001704 return bio_will_gap(req->q, req, req->biotail, bio);
Jens Axboe5e7c4272015-09-03 19:28:20 +03001705}
1706
1707static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
1708{
Ming Lei5a8d75a2017-04-14 13:58:29 -06001709 return bio_will_gap(req->q, NULL, bio, req->bio);
Jens Axboe5e7c4272015-09-03 19:28:20 +03001710}
1711
Jens Axboe59c3d452014-04-08 09:15:35 -06001712int kblockd_schedule_work(struct work_struct *work);
Jens Axboeee63cfa2016-08-24 15:52:48 -06001713int kblockd_schedule_work_on(int cpu, struct work_struct *work);
Jens Axboe59c3d452014-04-08 09:15:35 -06001714int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
Jens Axboe8ab14592014-04-08 09:17:40 -06001715int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
Jens Axboe818cd1c2017-04-10 09:54:55 -06001716int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717
Divyesh Shah91952912010-04-01 15:01:41 -07001718#ifdef CONFIG_BLK_CGROUP
Jens Axboe28f41972010-06-01 12:23:18 +02001719/*
1720 * This should not be using sched_clock(). A real patch is in progress
1721 * to fix this up, until that is in place we need to disable preemption
1722 * around sched_clock() in this function and set_io_start_time_ns().
1723 */
Divyesh Shah91952912010-04-01 15:01:41 -07001724static inline void set_start_time_ns(struct request *req)
1725{
Jens Axboe28f41972010-06-01 12:23:18 +02001726 preempt_disable();
Divyesh Shah91952912010-04-01 15:01:41 -07001727 req->start_time_ns = sched_clock();
Jens Axboe28f41972010-06-01 12:23:18 +02001728 preempt_enable();
Divyesh Shah91952912010-04-01 15:01:41 -07001729}
1730
1731static inline void set_io_start_time_ns(struct request *req)
1732{
Jens Axboe28f41972010-06-01 12:23:18 +02001733 preempt_disable();
Divyesh Shah91952912010-04-01 15:01:41 -07001734 req->io_start_time_ns = sched_clock();
Jens Axboe28f41972010-06-01 12:23:18 +02001735 preempt_enable();
Divyesh Shah91952912010-04-01 15:01:41 -07001736}
Divyesh Shah84c124d2010-04-09 08:31:19 +02001737
1738static inline uint64_t rq_start_time_ns(struct request *req)
1739{
1740 return req->start_time_ns;
1741}
1742
1743static inline uint64_t rq_io_start_time_ns(struct request *req)
1744{
1745 return req->io_start_time_ns;
1746}
Divyesh Shah91952912010-04-01 15:01:41 -07001747#else
1748static inline void set_start_time_ns(struct request *req) {}
1749static inline void set_io_start_time_ns(struct request *req) {}
Divyesh Shah84c124d2010-04-09 08:31:19 +02001750static inline uint64_t rq_start_time_ns(struct request *req)
1751{
1752 return 0;
1753}
1754static inline uint64_t rq_io_start_time_ns(struct request *req)
1755{
1756 return 0;
1757}
Divyesh Shah91952912010-04-01 15:01:41 -07001758#endif
1759
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1761 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1762#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1763 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1764
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001765#if defined(CONFIG_BLK_DEV_INTEGRITY)
1766
Martin K. Petersen8288f492014-09-26 19:20:02 -04001767enum blk_integrity_flags {
1768 BLK_INTEGRITY_VERIFY = 1 << 0,
1769 BLK_INTEGRITY_GENERATE = 1 << 1,
Martin K. Petersen3aec2f42014-09-26 19:20:03 -04001770 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
Martin K. Petersenaae7df52014-09-26 19:20:05 -04001771 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
Martin K. Petersen8288f492014-09-26 19:20:02 -04001772};
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001773
Martin K. Petersen18593082014-09-26 19:20:01 -04001774struct blk_integrity_iter {
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001775 void *prot_buf;
1776 void *data_buf;
Martin K. Petersen3be91c42014-09-26 19:19:59 -04001777 sector_t seed;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001778 unsigned int data_size;
Martin K. Petersen3be91c42014-09-26 19:19:59 -04001779 unsigned short interval;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001780 const char *disk_name;
1781};
1782
Martin K. Petersen18593082014-09-26 19:20:01 -04001783typedef int (integrity_processing_fn) (struct blk_integrity_iter *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001784
Martin K. Petersen0f8087e2015-10-21 13:19:33 -04001785struct blk_integrity_profile {
1786 integrity_processing_fn *generate_fn;
1787 integrity_processing_fn *verify_fn;
1788 const char *name;
1789};
1790
Martin K. Petersen25520d52015-10-21 13:19:49 -04001791extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001792extern void blk_integrity_unregister(struct gendisk *);
Martin K. Petersenad7fce92008-10-01 03:38:39 -04001793extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
Martin K. Petersen13f05c82010-09-10 20:50:10 +02001794extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1795 struct scatterlist *);
1796extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
Martin K. Petersen4eaf99b2014-09-26 19:20:06 -04001797extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1798 struct request *);
1799extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1800 struct bio *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001801
Martin K. Petersen25520d52015-10-21 13:19:49 -04001802static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1803{
Dan Williamsac6fc482015-10-21 13:20:18 -04001804 struct blk_integrity *bi = &disk->queue->integrity;
Martin K. Petersen25520d52015-10-21 13:19:49 -04001805
1806 if (!bi->profile)
1807 return NULL;
1808
1809 return bi;
1810}
1811
Jens Axboeb04accc2008-10-02 12:53:22 +02001812static inline
1813struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1814{
Martin K. Petersen25520d52015-10-21 13:19:49 -04001815 return blk_get_integrity(bdev->bd_disk);
Martin K. Petersenb02739b2008-10-02 18:47:49 +02001816}
1817
Martin K. Petersen180b2f92014-09-26 19:19:56 -04001818static inline bool blk_integrity_rq(struct request *rq)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001819{
Martin K. Petersen180b2f92014-09-26 19:19:56 -04001820 return rq->cmd_flags & REQ_INTEGRITY;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001821}
1822
Martin K. Petersen13f05c82010-09-10 20:50:10 +02001823static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1824 unsigned int segs)
1825{
1826 q->limits.max_integrity_segments = segs;
1827}
1828
1829static inline unsigned short
1830queue_max_integrity_segments(struct request_queue *q)
1831{
1832 return q->limits.max_integrity_segments;
1833}
1834
Sagi Grimberg7f39add2015-09-11 09:03:04 -06001835static inline bool integrity_req_gap_back_merge(struct request *req,
1836 struct bio *next)
1837{
1838 struct bio_integrity_payload *bip = bio_integrity(req->bio);
1839 struct bio_integrity_payload *bip_next = bio_integrity(next);
1840
1841 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1842 bip_next->bip_vec[0].bv_offset);
1843}
1844
1845static inline bool integrity_req_gap_front_merge(struct request *req,
1846 struct bio *bio)
1847{
1848 struct bio_integrity_payload *bip = bio_integrity(bio);
1849 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
1850
1851 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1852 bip_next->bip_vec[0].bv_offset);
1853}
1854
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001855#else /* CONFIG_BLK_DEV_INTEGRITY */
1856
Stephen Rothwellfd832402012-01-12 09:17:30 +01001857struct bio;
1858struct block_device;
1859struct gendisk;
1860struct blk_integrity;
1861
1862static inline int blk_integrity_rq(struct request *rq)
1863{
1864 return 0;
1865}
1866static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1867 struct bio *b)
1868{
1869 return 0;
1870}
1871static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1872 struct bio *b,
1873 struct scatterlist *s)
1874{
1875 return 0;
1876}
1877static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1878{
Michele Curti61a04e52014-10-09 15:30:17 -07001879 return NULL;
Stephen Rothwellfd832402012-01-12 09:17:30 +01001880}
1881static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1882{
1883 return NULL;
1884}
1885static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1886{
1887 return 0;
1888}
Martin K. Petersen25520d52015-10-21 13:19:49 -04001889static inline void blk_integrity_register(struct gendisk *d,
Stephen Rothwellfd832402012-01-12 09:17:30 +01001890 struct blk_integrity *b)
1891{
Stephen Rothwellfd832402012-01-12 09:17:30 +01001892}
1893static inline void blk_integrity_unregister(struct gendisk *d)
1894{
1895}
1896static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1897 unsigned int segs)
1898{
1899}
1900static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1901{
1902 return 0;
1903}
Martin K. Petersen4eaf99b2014-09-26 19:20:06 -04001904static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1905 struct request *r1,
1906 struct request *r2)
Stephen Rothwellfd832402012-01-12 09:17:30 +01001907{
Martin K. Petersencb1a5ab2014-10-28 20:27:43 -06001908 return true;
Stephen Rothwellfd832402012-01-12 09:17:30 +01001909}
Martin K. Petersen4eaf99b2014-09-26 19:20:06 -04001910static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1911 struct request *r,
1912 struct bio *b)
Stephen Rothwellfd832402012-01-12 09:17:30 +01001913{
Martin K. Petersencb1a5ab2014-10-28 20:27:43 -06001914 return true;
Stephen Rothwellfd832402012-01-12 09:17:30 +01001915}
Martin K. Petersen25520d52015-10-21 13:19:49 -04001916
Sagi Grimberg7f39add2015-09-11 09:03:04 -06001917static inline bool integrity_req_gap_back_merge(struct request *req,
1918 struct bio *next)
1919{
1920 return false;
1921}
1922static inline bool integrity_req_gap_front_merge(struct request *req,
1923 struct bio *bio)
1924{
1925 return false;
1926}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001927
1928#endif /* CONFIG_BLK_DEV_INTEGRITY */
1929
Al Viro08f85852007-10-08 13:26:20 -04001930struct block_device_operations {
Al Virod4430d62008-03-02 09:09:22 -05001931 int (*open) (struct block_device *, fmode_t);
Al Virodb2a1442013-05-05 21:52:57 -04001932 void (*release) (struct gendisk *, fmode_t);
Jens Axboec11f0c02016-08-05 08:11:04 -06001933 int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
Al Virod4430d62008-03-02 09:09:22 -05001934 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1935 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
Tejun Heo77ea8872010-12-08 20:57:37 +01001936 unsigned int (*check_events) (struct gendisk *disk,
1937 unsigned int clearing);
1938 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
Al Viro08f85852007-10-08 13:26:20 -04001939 int (*media_changed) (struct gendisk *);
Tejun Heoc3e33e02010-05-15 20:09:29 +02001940 void (*unlock_native_capacity) (struct gendisk *);
Al Viro08f85852007-10-08 13:26:20 -04001941 int (*revalidate_disk) (struct gendisk *);
1942 int (*getgeo)(struct block_device *, struct hd_geometry *);
Nitin Guptab3a27d02010-05-17 11:02:43 +05301943 /* this callback is with swap_lock and sometimes page table lock held */
1944 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
Al Viro08f85852007-10-08 13:26:20 -04001945 struct module *owner;
Christoph Hellwigbbd3e062015-10-15 14:10:48 +02001946 const struct pr_ops *pr_ops;
Al Viro08f85852007-10-08 13:26:20 -04001947};
1948
Al Viro633a08b2007-08-29 20:34:12 -04001949extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1950 unsigned long);
Matthew Wilcox47a191f2014-06-04 16:07:46 -07001951extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1952extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1953 struct writeback_control *);
David Howells93614012006-09-30 20:45:40 +02001954#else /* CONFIG_BLOCK */
Fabian Frederickac13a822014-06-04 16:06:27 -07001955
1956struct block_device;
1957
David Howells93614012006-09-30 20:45:40 +02001958/*
1959 * stubs for when the block layer is configured out
1960 */
1961#define buffer_heads_over_limit 0
1962
David Howells93614012006-09-30 20:45:40 +02001963static inline long nr_blockdev_pages(void)
1964{
1965 return 0;
1966}
1967
Jens Axboe1f940bd2011-03-11 20:17:08 +01001968struct blk_plug {
1969};
1970
1971static inline void blk_start_plug(struct blk_plug *plug)
Jens Axboe73c10102011-03-08 13:19:51 +01001972{
1973}
1974
Jens Axboe1f940bd2011-03-11 20:17:08 +01001975static inline void blk_finish_plug(struct blk_plug *plug)
Jens Axboe73c10102011-03-08 13:19:51 +01001976{
1977}
1978
Jens Axboe1f940bd2011-03-11 20:17:08 +01001979static inline void blk_flush_plug(struct task_struct *task)
Jens Axboe73c10102011-03-08 13:19:51 +01001980{
1981}
1982
Jens Axboea237c1c2011-04-16 13:27:55 +02001983static inline void blk_schedule_flush_plug(struct task_struct *task)
1984{
1985}
1986
1987
Jens Axboe73c10102011-03-08 13:19:51 +01001988static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1989{
1990 return false;
1991}
1992
Fabian Frederickac13a822014-06-04 16:06:27 -07001993static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1994 sector_t *error_sector)
1995{
1996 return 0;
1997}
1998
David Howells93614012006-09-30 20:45:40 +02001999#endif /* CONFIG_BLOCK */
2000
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001#endif