Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef _LINUX_BLKDEV_H
3 : #define _LINUX_BLKDEV_H
4 :
5 : #include <linux/sched.h>
6 : #include <linux/sched/clock.h>
7 : #include <linux/major.h>
8 : #include <linux/genhd.h>
9 : #include <linux/list.h>
10 : #include <linux/llist.h>
11 : #include <linux/minmax.h>
12 : #include <linux/timer.h>
13 : #include <linux/workqueue.h>
14 : #include <linux/pagemap.h>
15 : #include <linux/backing-dev-defs.h>
16 : #include <linux/wait.h>
17 : #include <linux/mempool.h>
18 : #include <linux/pfn.h>
19 : #include <linux/bio.h>
20 : #include <linux/stringify.h>
21 : #include <linux/gfp.h>
22 : #include <linux/bsg.h>
23 : #include <linux/smp.h>
24 : #include <linux/rcupdate.h>
25 : #include <linux/percpu-refcount.h>
26 : #include <linux/scatterlist.h>
27 : #include <linux/blkzoned.h>
28 : #include <linux/pm.h>
29 :
30 : struct module;
31 : struct scsi_ioctl_command;
32 :
33 : struct request_queue;
34 : struct elevator_queue;
35 : struct blk_trace;
36 : struct request;
37 : struct sg_io_hdr;
38 : struct bsg_job;
39 : struct blkcg_gq;
40 : struct blk_flush_queue;
41 : struct pr_ops;
42 : struct rq_qos;
43 : struct blk_queue_stats;
44 : struct blk_stat_callback;
45 : struct blk_keyslot_manager;
46 :
47 : #define BLKDEV_MIN_RQ 4
48 : #define BLKDEV_MAX_RQ 128 /* Default maximum */
49 :
50 : /* Must be consistent with blk_mq_poll_stats_bkt() */
51 : #define BLK_MQ_POLL_STATS_BKTS 16
52 :
53 : /* Doing classic polling */
54 : #define BLK_MQ_POLL_CLASSIC -1
55 :
56 : /*
57 : * Maximum number of blkcg policies allowed to be registered concurrently.
58 : * Defined here to simplify include dependency.
59 : */
60 : #define BLKCG_MAX_POLS 5
61 :
62 : typedef void (rq_end_io_fn)(struct request *, blk_status_t);
63 :
64 : /*
65 : * request flags */
66 : typedef __u32 __bitwise req_flags_t;
67 :
68 : /* drive already may have started this one */
69 : #define RQF_STARTED ((__force req_flags_t)(1 << 1))
70 : /* may not be passed by ioscheduler */
71 : #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
72 : /* request for flush sequence */
73 : #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
74 : /* merge of different types, fail separately */
75 : #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
76 : /* track inflight for MQ */
77 : #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
78 : /* don't call prep for this one */
79 : #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
80 : /* vaguely specified driver internal error. Ignored by the block layer */
81 : #define RQF_FAILED ((__force req_flags_t)(1 << 10))
82 : /* don't warn about errors */
83 : #define RQF_QUIET ((__force req_flags_t)(1 << 11))
84 : /* elevator private data attached */
85 : #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
86 : /* account into disk and partition IO statistics */
87 : #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
88 : /* request came from our alloc pool */
89 : #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
90 : /* runtime pm request */
91 : #define RQF_PM ((__force req_flags_t)(1 << 15))
92 : /* on IO scheduler merge hash */
93 : #define RQF_HASHED ((__force req_flags_t)(1 << 16))
94 : /* track IO completion time */
95 : #define RQF_STATS ((__force req_flags_t)(1 << 17))
96 : /* Look at ->special_vec for the actual data payload instead of the
97 : bio chain. */
98 : #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
99 : /* The per-zone write lock is held for this request */
100 : #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
101 : /* already slept for hybrid poll */
102 : #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
103 : /* ->timeout has been called, don't expire again */
104 : #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
105 :
106 : /* flags that prevent us from merging requests: */
107 : #define RQF_NOMERGE_FLAGS \
108 : (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
109 :
110 : /*
111 : * Request state for blk-mq.
112 : */
113 : enum mq_rq_state {
114 : MQ_RQ_IDLE = 0,
115 : MQ_RQ_IN_FLIGHT = 1,
116 : MQ_RQ_COMPLETE = 2,
117 : };
118 :
119 : /*
120 : * Try to put the fields that are referenced together in the same cacheline.
121 : *
122 : * If you modify this structure, make sure to update blk_rq_init() and
123 : * especially blk_mq_rq_ctx_init() to take care of the added fields.
124 : */
125 : struct request {
126 : struct request_queue *q;
127 : struct blk_mq_ctx *mq_ctx;
128 : struct blk_mq_hw_ctx *mq_hctx;
129 :
130 : unsigned int cmd_flags; /* op and common flags */
131 : req_flags_t rq_flags;
132 :
133 : int tag;
134 : int internal_tag;
135 :
136 : /* the following two fields are internal, NEVER access directly */
137 : unsigned int __data_len; /* total data len */
138 : sector_t __sector; /* sector cursor */
139 :
140 : struct bio *bio;
141 : struct bio *biotail;
142 :
143 : struct list_head queuelist;
144 :
145 : /*
146 : * The hash is used inside the scheduler, and killed once the
147 : * request reaches the dispatch list. The ipi_list is only used
148 : * to queue the request for softirq completion, which is long
149 : * after the request has been unhashed (and even removed from
150 : * the dispatch list).
151 : */
152 : union {
153 : struct hlist_node hash; /* merge hash */
154 : struct llist_node ipi_list;
155 : };
156 :
157 : /*
158 : * The rb_node is only used inside the io scheduler, requests
159 : * are pruned when moved to the dispatch queue. So let the
160 : * completion_data share space with the rb_node.
161 : */
162 : union {
163 : struct rb_node rb_node; /* sort/lookup */
164 : struct bio_vec special_vec;
165 : void *completion_data;
166 : int error_count; /* for legacy drivers, don't use */
167 : };
168 :
169 : /*
170 : * Three pointers are available for the IO schedulers, if they need
171 : * more they have to dynamically allocate it. Flush requests are
172 : * never put on the IO scheduler. So let the flush fields share
173 : * space with the elevator data.
174 : */
175 : union {
176 : struct {
177 : struct io_cq *icq;
178 : void *priv[2];
179 : } elv;
180 :
181 : struct {
182 : unsigned int seq;
183 : struct list_head list;
184 : rq_end_io_fn *saved_end_io;
185 : } flush;
186 : };
187 :
188 : struct gendisk *rq_disk;
189 : struct block_device *part;
190 : #ifdef CONFIG_BLK_RQ_ALLOC_TIME
191 : /* Time that the first bio started allocating this request. */
192 : u64 alloc_time_ns;
193 : #endif
194 : /* Time that this request was allocated for this IO. */
195 : u64 start_time_ns;
196 : /* Time that I/O was submitted to the device. */
197 : u64 io_start_time_ns;
198 :
199 : #ifdef CONFIG_BLK_WBT
200 : unsigned short wbt_flags;
201 : #endif
202 : /*
203 : * rq sectors used for blk stats. It has the same value
204 : * with blk_rq_sectors(rq), except that it never be zeroed
205 : * by completion.
206 : */
207 : unsigned short stats_sectors;
208 :
209 : /*
210 : * Number of scatter-gather DMA addr+len pairs after
211 : * physical address coalescing is performed.
212 : */
213 : unsigned short nr_phys_segments;
214 :
215 : #if defined(CONFIG_BLK_DEV_INTEGRITY)
216 : unsigned short nr_integrity_segments;
217 : #endif
218 :
219 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
220 : struct bio_crypt_ctx *crypt_ctx;
221 : struct blk_ksm_keyslot *crypt_keyslot;
222 : #endif
223 :
224 : unsigned short write_hint;
225 : unsigned short ioprio;
226 :
227 : enum mq_rq_state state;
228 : refcount_t ref;
229 :
230 : unsigned int timeout;
231 : unsigned long deadline;
232 :
233 : union {
234 : struct __call_single_data csd;
235 : u64 fifo_time;
236 : };
237 :
238 : /*
239 : * completion callback.
240 : */
241 : rq_end_io_fn *end_io;
242 : void *end_io_data;
243 : };
244 :
245 14783 : static inline bool blk_op_is_scsi(unsigned int op)
246 : {
247 14783 : return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
248 : }
249 :
250 14783 : static inline bool blk_op_is_private(unsigned int op)
251 : {
252 14783 : return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
253 : }
254 :
255 14783 : static inline bool blk_rq_is_scsi(struct request *rq)
256 : {
257 14783 : return blk_op_is_scsi(req_op(rq));
258 : }
259 :
260 14783 : static inline bool blk_rq_is_private(struct request *rq)
261 : {
262 14783 : return blk_op_is_private(req_op(rq));
263 : }
264 :
265 14783 : static inline bool blk_rq_is_passthrough(struct request *rq)
266 : {
267 14787 : return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
268 : }
269 :
270 : static inline bool bio_is_passthrough(struct bio *bio)
271 : {
272 : unsigned op = bio_op(bio);
273 :
274 : return blk_op_is_scsi(op) || blk_op_is_private(op);
275 : }
276 :
277 3435 : static inline unsigned short req_get_ioprio(struct request *req)
278 : {
279 3435 : return req->ioprio;
280 : }
281 :
282 : #include <linux/elevator.h>
283 :
284 : struct blk_queue_ctx;
285 :
286 : struct bio_vec;
287 :
288 : enum blk_eh_timer_return {
289 : BLK_EH_DONE, /* drivers has completed the command */
290 : BLK_EH_RESET_TIMER, /* reset timer and try again */
291 : };
292 :
293 : enum blk_queue_state {
294 : Queue_down,
295 : Queue_up,
296 : };
297 :
298 : #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
299 : #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
300 :
301 : #define BLK_SCSI_MAX_CMDS (256)
302 : #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
303 :
304 : /*
305 : * Zoned block device models (zoned limit).
306 : *
307 : * Note: This needs to be ordered from the least to the most severe
308 : * restrictions for the inheritance in blk_stack_limits() to work.
309 : */
310 : enum blk_zoned_model {
311 : BLK_ZONED_NONE = 0, /* Regular block device */
312 : BLK_ZONED_HA, /* Host-aware zoned block device */
313 : BLK_ZONED_HM, /* Host-managed zoned block device */
314 : };
315 :
316 : struct queue_limits {
317 : unsigned long bounce_pfn;
318 : unsigned long seg_boundary_mask;
319 : unsigned long virt_boundary_mask;
320 :
321 : unsigned int max_hw_sectors;
322 : unsigned int max_dev_sectors;
323 : unsigned int chunk_sectors;
324 : unsigned int max_sectors;
325 : unsigned int max_segment_size;
326 : unsigned int physical_block_size;
327 : unsigned int logical_block_size;
328 : unsigned int alignment_offset;
329 : unsigned int io_min;
330 : unsigned int io_opt;
331 : unsigned int max_discard_sectors;
332 : unsigned int max_hw_discard_sectors;
333 : unsigned int max_write_same_sectors;
334 : unsigned int max_write_zeroes_sectors;
335 : unsigned int max_zone_append_sectors;
336 : unsigned int discard_granularity;
337 : unsigned int discard_alignment;
338 : unsigned int zone_write_granularity;
339 :
340 : unsigned short max_segments;
341 : unsigned short max_integrity_segments;
342 : unsigned short max_discard_segments;
343 :
344 : unsigned char misaligned;
345 : unsigned char discard_misaligned;
346 : unsigned char raid_partial_stripes_expensive;
347 : enum blk_zoned_model zoned;
348 : };
349 :
350 : typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
351 : void *data);
352 :
353 : void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
354 :
355 : #ifdef CONFIG_BLK_DEV_ZONED
356 :
357 : #define BLK_ALL_ZONES ((unsigned int)-1)
358 : int blkdev_report_zones(struct block_device *bdev, sector_t sector,
359 : unsigned int nr_zones, report_zones_cb cb, void *data);
360 : unsigned int blkdev_nr_zones(struct gendisk *disk);
361 : extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
362 : sector_t sectors, sector_t nr_sectors,
363 : gfp_t gfp_mask);
364 : int blk_revalidate_disk_zones(struct gendisk *disk,
365 : void (*update_driver_data)(struct gendisk *disk));
366 :
367 : extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
368 : unsigned int cmd, unsigned long arg);
369 : extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
370 : unsigned int cmd, unsigned long arg);
371 :
372 : #else /* CONFIG_BLK_DEV_ZONED */
373 :
374 0 : static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
375 : {
376 0 : return 0;
377 : }
378 :
379 : static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
380 : fmode_t mode, unsigned int cmd,
381 : unsigned long arg)
382 : {
383 : return -ENOTTY;
384 : }
385 :
386 : static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
387 : fmode_t mode, unsigned int cmd,
388 : unsigned long arg)
389 : {
390 : return -ENOTTY;
391 : }
392 :
393 : #endif /* CONFIG_BLK_DEV_ZONED */
394 :
395 : struct request_queue {
396 : struct request *last_merge;
397 : struct elevator_queue *elevator;
398 :
399 : struct percpu_ref q_usage_counter;
400 :
401 : struct blk_queue_stats *stats;
402 : struct rq_qos *rq_qos;
403 :
404 : const struct blk_mq_ops *mq_ops;
405 :
406 : /* sw queues */
407 : struct blk_mq_ctx __percpu *queue_ctx;
408 :
409 : unsigned int queue_depth;
410 :
411 : /* hw dispatch queues */
412 : struct blk_mq_hw_ctx **queue_hw_ctx;
413 : unsigned int nr_hw_queues;
414 :
415 : struct backing_dev_info *backing_dev_info;
416 :
417 : /*
418 : * The queue owner gets to use this for whatever they like.
419 : * ll_rw_blk doesn't touch it.
420 : */
421 : void *queuedata;
422 :
423 : /*
424 : * various queue flags, see QUEUE_* below
425 : */
426 : unsigned long queue_flags;
427 : /*
428 : * Number of contexts that have called blk_set_pm_only(). If this
429 : * counter is above zero then only RQF_PM requests are processed.
430 : */
431 : atomic_t pm_only;
432 :
433 : /*
434 : * ida allocated id for this queue. Used to index queues from
435 : * ioctx.
436 : */
437 : int id;
438 :
439 : /*
440 : * queue needs bounce pages for pages above this limit
441 : */
442 : gfp_t bounce_gfp;
443 :
444 : spinlock_t queue_lock;
445 :
446 : /*
447 : * queue kobject
448 : */
449 : struct kobject kobj;
450 :
451 : /*
452 : * mq queue kobject
453 : */
454 : struct kobject *mq_kobj;
455 :
456 : #ifdef CONFIG_BLK_DEV_INTEGRITY
457 : struct blk_integrity integrity;
458 : #endif /* CONFIG_BLK_DEV_INTEGRITY */
459 :
460 : #ifdef CONFIG_PM
461 : struct device *dev;
462 : enum rpm_status rpm_status;
463 : #endif
464 :
465 : /*
466 : * queue settings
467 : */
468 : unsigned long nr_requests; /* Max # of requests */
469 :
470 : unsigned int dma_pad_mask;
471 : unsigned int dma_alignment;
472 :
473 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
474 : /* Inline crypto capabilities */
475 : struct blk_keyslot_manager *ksm;
476 : #endif
477 :
478 : unsigned int rq_timeout;
479 : int poll_nsec;
480 :
481 : struct blk_stat_callback *poll_cb;
482 : struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
483 :
484 : struct timer_list timeout;
485 : struct work_struct timeout_work;
486 :
487 : atomic_t nr_active_requests_shared_sbitmap;
488 :
489 : struct list_head icq_list;
490 : #ifdef CONFIG_BLK_CGROUP
491 : DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
492 : struct blkcg_gq *root_blkg;
493 : struct list_head blkg_list;
494 : #endif
495 :
496 : struct queue_limits limits;
497 :
498 : unsigned int required_elevator_features;
499 :
500 : #ifdef CONFIG_BLK_DEV_ZONED
501 : /*
502 : * Zoned block device information for request dispatch control.
503 : * nr_zones is the total number of zones of the device. This is always
504 : * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
505 : * bits which indicates if a zone is conventional (bit set) or
506 : * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
507 : * bits which indicates if a zone is write locked, that is, if a write
508 : * request targeting the zone was dispatched. All three fields are
509 : * initialized by the low level device driver (e.g. scsi/sd.c).
510 : * Stacking drivers (device mappers) may or may not initialize
511 : * these fields.
512 : *
513 : * Reads of this information must be protected with blk_queue_enter() /
514 : * blk_queue_exit(). Modifying this information is only allowed while
515 : * no requests are being processed. See also blk_mq_freeze_queue() and
516 : * blk_mq_unfreeze_queue().
517 : */
518 : unsigned int nr_zones;
519 : unsigned long *conv_zones_bitmap;
520 : unsigned long *seq_zones_wlock;
521 : unsigned int max_open_zones;
522 : unsigned int max_active_zones;
523 : #endif /* CONFIG_BLK_DEV_ZONED */
524 :
525 : /*
526 : * sg stuff
527 : */
528 : unsigned int sg_timeout;
529 : unsigned int sg_reserved_size;
530 : int node;
531 : struct mutex debugfs_mutex;
532 : #ifdef CONFIG_BLK_DEV_IO_TRACE
533 : struct blk_trace __rcu *blk_trace;
534 : #endif
535 : /*
536 : * for flush operations
537 : */
538 : struct blk_flush_queue *fq;
539 :
540 : struct list_head requeue_list;
541 : spinlock_t requeue_lock;
542 : struct delayed_work requeue_work;
543 :
544 : struct mutex sysfs_lock;
545 : struct mutex sysfs_dir_lock;
546 :
547 : /*
548 : * for reusing dead hctx instance in case of updating
549 : * nr_hw_queues
550 : */
551 : struct list_head unused_hctx_list;
552 : spinlock_t unused_hctx_lock;
553 :
554 : int mq_freeze_depth;
555 :
556 : #if defined(CONFIG_BLK_DEV_BSG)
557 : struct bsg_class_device bsg_dev;
558 : #endif
559 :
560 : #ifdef CONFIG_BLK_DEV_THROTTLING
561 : /* Throttle data */
562 : struct throtl_data *td;
563 : #endif
564 : struct rcu_head rcu_head;
565 : wait_queue_head_t mq_freeze_wq;
566 : /*
567 : * Protect concurrent access to q_usage_counter by
568 : * percpu_ref_kill() and percpu_ref_reinit().
569 : */
570 : struct mutex mq_freeze_lock;
571 :
572 : struct blk_mq_tag_set *tag_set;
573 : struct list_head tag_set_list;
574 : struct bio_set bio_split;
575 :
576 : struct dentry *debugfs_dir;
577 :
578 : #ifdef CONFIG_BLK_DEBUG_FS
579 : struct dentry *sched_debugfs_dir;
580 : struct dentry *rqos_debugfs_dir;
581 : #endif
582 :
583 : bool mq_sysfs_init_done;
584 :
585 : size_t cmd_size;
586 :
587 : #define BLK_MAX_WRITE_HINTS 5
588 : u64 write_hints[BLK_MAX_WRITE_HINTS];
589 : };
590 :
591 : /* Keep blk_queue_flag_name[] in sync with the definitions below */
592 : #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
593 : #define QUEUE_FLAG_DYING 1 /* queue being torn down */
594 : #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
595 : #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
596 : #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
597 : #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
598 : #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
599 : #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
600 : #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
601 : #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
602 : #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
603 : #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
604 : #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
605 : #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
606 : #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
607 : #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
608 : #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
609 : #define QUEUE_FLAG_WC 17 /* Write back caching */
610 : #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
611 : #define QUEUE_FLAG_DAX 19 /* device supports DAX */
612 : #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
613 : #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
614 : #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
615 : #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
616 : #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
617 : #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
618 : #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
619 : #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
620 : #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
621 : #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
622 :
623 : #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
624 : (1 << QUEUE_FLAG_SAME_COMP) | \
625 : (1 << QUEUE_FLAG_NOWAIT))
626 :
627 : void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
628 : void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
629 : bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
630 :
631 : #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
632 : #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
633 : #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
634 : #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
635 : #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
636 : #define blk_queue_noxmerges(q) \
637 : test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
638 : #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
639 : #define blk_queue_stable_writes(q) \
640 : test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
641 : #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
642 : #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
643 : #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
644 : #define blk_queue_zone_resetall(q) \
645 : test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
646 : #define blk_queue_secure_erase(q) \
647 : (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
648 : #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
649 : #define blk_queue_scsi_passthrough(q) \
650 : test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
651 : #define blk_queue_pci_p2pdma(q) \
652 : test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
653 : #ifdef CONFIG_BLK_RQ_ALLOC_TIME
654 : #define blk_queue_rq_alloc_time(q) \
655 : test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
656 : #else
657 : #define blk_queue_rq_alloc_time(q) false
658 : #endif
659 :
660 : #define blk_noretry_request(rq) \
661 : ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
662 : REQ_FAILFAST_DRIVER))
663 : #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
664 : #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
665 : #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
666 : #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
667 : #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
668 :
669 : extern void blk_set_pm_only(struct request_queue *q);
670 : extern void blk_clear_pm_only(struct request_queue *q);
671 :
672 : static inline bool blk_account_rq(struct request *rq)
673 : {
674 : return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
675 : }
676 :
677 : #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
678 :
679 : #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
680 :
681 : #define rq_dma_dir(rq) \
682 : (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
683 :
684 : #define dma_map_bvec(dev, bv, dir, attrs) \
685 : dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
686 : (dir), (attrs))
687 :
688 18 : static inline bool queue_is_mq(struct request_queue *q)
689 : {
690 18 : return q->mq_ops;
691 : }
692 :
693 : #ifdef CONFIG_PM
694 : static inline enum rpm_status queue_rpm_status(struct request_queue *q)
695 : {
696 : return q->rpm_status;
697 : }
698 : #else
699 : static inline enum rpm_status queue_rpm_status(struct request_queue *q)
700 : {
701 : return RPM_ACTIVE;
702 : }
703 : #endif
704 :
705 : static inline enum blk_zoned_model
706 20594 : blk_queue_zoned_model(struct request_queue *q)
707 : {
708 20594 : if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
709 : return q->limits.zoned;
710 20594 : return BLK_ZONED_NONE;
711 : }
712 :
713 20594 : static inline bool blk_queue_is_zoned(struct request_queue *q)
714 : {
715 20954 : switch (blk_queue_zoned_model(q)) {
716 : case BLK_ZONED_HA:
717 : case BLK_ZONED_HM:
718 : return true;
719 : default:
720 20594 : return false;
721 : }
722 : }
723 :
724 0 : static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
725 : {
726 0 : return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
727 : }
728 :
729 : #ifdef CONFIG_BLK_DEV_ZONED
730 : static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
731 : {
732 : return blk_queue_is_zoned(q) ? q->nr_zones : 0;
733 : }
734 :
735 : static inline unsigned int blk_queue_zone_no(struct request_queue *q,
736 : sector_t sector)
737 : {
738 : if (!blk_queue_is_zoned(q))
739 : return 0;
740 : return sector >> ilog2(q->limits.chunk_sectors);
741 : }
742 :
743 : static inline bool blk_queue_zone_is_seq(struct request_queue *q,
744 : sector_t sector)
745 : {
746 : if (!blk_queue_is_zoned(q))
747 : return false;
748 : if (!q->conv_zones_bitmap)
749 : return true;
750 : return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
751 : }
752 :
753 : static inline void blk_queue_max_open_zones(struct request_queue *q,
754 : unsigned int max_open_zones)
755 : {
756 : q->max_open_zones = max_open_zones;
757 : }
758 :
759 : static inline unsigned int queue_max_open_zones(const struct request_queue *q)
760 : {
761 : return q->max_open_zones;
762 : }
763 :
764 : static inline void blk_queue_max_active_zones(struct request_queue *q,
765 : unsigned int max_active_zones)
766 : {
767 : q->max_active_zones = max_active_zones;
768 : }
769 :
770 : static inline unsigned int queue_max_active_zones(const struct request_queue *q)
771 : {
772 : return q->max_active_zones;
773 : }
774 : #else /* CONFIG_BLK_DEV_ZONED */
775 0 : static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
776 : {
777 0 : return 0;
778 : }
779 : static inline bool blk_queue_zone_is_seq(struct request_queue *q,
780 : sector_t sector)
781 : {
782 : return false;
783 : }
784 : static inline unsigned int blk_queue_zone_no(struct request_queue *q,
785 : sector_t sector)
786 : {
787 : return 0;
788 : }
789 0 : static inline unsigned int queue_max_open_zones(const struct request_queue *q)
790 : {
791 0 : return 0;
792 : }
793 0 : static inline unsigned int queue_max_active_zones(const struct request_queue *q)
794 : {
795 0 : return 0;
796 : }
797 : #endif /* CONFIG_BLK_DEV_ZONED */
798 :
799 3254 : static inline bool rq_is_sync(struct request *rq)
800 : {
801 3947 : return op_is_sync(rq->cmd_flags);
802 : }
803 :
804 9293 : static inline bool rq_mergeable(struct request *rq)
805 : {
806 18586 : if (blk_rq_is_passthrough(rq))
807 : return false;
808 :
809 9293 : if (req_op(rq) == REQ_OP_FLUSH)
810 : return false;
811 :
812 9293 : if (req_op(rq) == REQ_OP_WRITE_ZEROES)
813 : return false;
814 :
815 9293 : if (req_op(rq) == REQ_OP_ZONE_APPEND)
816 : return false;
817 :
818 9293 : if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
819 : return false;
820 9293 : if (rq->rq_flags & RQF_NOMERGE_FLAGS)
821 0 : return false;
822 :
823 : return true;
824 : }
825 :
826 0 : static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
827 : {
828 0 : if (bio_page(a) == bio_page(b) &&
829 0 : bio_offset(a) == bio_offset(b))
830 0 : return true;
831 :
832 : return false;
833 : }
834 :
835 : static inline unsigned int blk_queue_depth(struct request_queue *q)
836 : {
837 : if (q->queue_depth)
838 : return q->queue_depth;
839 :
840 : return q->nr_requests;
841 : }
842 :
843 : extern unsigned long blk_max_low_pfn, blk_max_pfn;
844 :
845 : /*
846 : * standard bounce addresses:
847 : *
848 : * BLK_BOUNCE_HIGH : bounce all highmem pages
849 : * BLK_BOUNCE_ANY : don't bounce anything
850 : * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
851 : */
852 :
853 : #if BITS_PER_LONG == 32
854 : #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
855 : #else
856 : #define BLK_BOUNCE_HIGH -1ULL
857 : #endif
858 : #define BLK_BOUNCE_ANY (-1ULL)
859 : #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
860 :
861 : /*
862 : * default timeout for SG_IO if none specified
863 : */
864 : #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
865 : #define BLK_MIN_SG_TIMEOUT (7 * HZ)
866 :
867 : struct rq_map_data {
868 : struct page **pages;
869 : int page_order;
870 : int nr_entries;
871 : unsigned long offset;
872 : int null_mapped;
873 : int from_user;
874 : };
875 :
876 : struct req_iterator {
877 : struct bvec_iter iter;
878 : struct bio *bio;
879 : };
880 :
881 : /* This should not be used directly - use rq_for_each_segment */
882 : #define for_each_bio(_bio) \
883 : for (; _bio; _bio = _bio->bi_next)
884 : #define __rq_for_each_bio(_bio, rq) \
885 : if ((rq->bio)) \
886 : for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
887 :
888 : #define rq_for_each_segment(bvl, _rq, _iter) \
889 : __rq_for_each_bio(_iter.bio, _rq) \
890 : bio_for_each_segment(bvl, _iter.bio, _iter.iter)
891 :
892 : #define rq_for_each_bvec(bvl, _rq, _iter) \
893 : __rq_for_each_bio(_iter.bio, _rq) \
894 : bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
895 :
896 : #define rq_iter_last(bvec, _iter) \
897 : (_iter.bio->bi_next == NULL && \
898 : bio_iter_last(bvec, _iter.iter))
899 :
900 : #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
901 : # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
902 : #endif
903 : #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
904 : extern void rq_flush_dcache_pages(struct request *rq);
905 : #else
906 : static inline void rq_flush_dcache_pages(struct request *rq)
907 : {
908 : }
909 : #endif
910 :
911 : extern int blk_register_queue(struct gendisk *disk);
912 : extern void blk_unregister_queue(struct gendisk *disk);
913 : blk_qc_t submit_bio_noacct(struct bio *bio);
914 : extern void blk_rq_init(struct request_queue *q, struct request *rq);
915 : extern void blk_put_request(struct request *);
916 : extern struct request *blk_get_request(struct request_queue *, unsigned int op,
917 : blk_mq_req_flags_t flags);
918 : extern int blk_lld_busy(struct request_queue *q);
919 : extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
920 : struct bio_set *bs, gfp_t gfp_mask,
921 : int (*bio_ctr)(struct bio *, struct bio *, void *),
922 : void *data);
923 : extern void blk_rq_unprep_clone(struct request *rq);
924 : extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
925 : struct request *rq);
926 : extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
927 : extern void blk_queue_split(struct bio **);
928 : extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
929 : extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
930 : unsigned int, void __user *);
931 : extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
932 : unsigned int, void __user *);
933 : extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
934 : struct scsi_ioctl_command __user *);
935 : extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
936 : extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
937 :
938 : extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
939 : extern void blk_queue_exit(struct request_queue *q);
940 : extern void blk_sync_queue(struct request_queue *q);
941 : extern int blk_rq_map_user(struct request_queue *, struct request *,
942 : struct rq_map_data *, void __user *, unsigned long,
943 : gfp_t);
944 : extern int blk_rq_unmap_user(struct bio *);
945 : extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
946 : extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
947 : struct rq_map_data *, const struct iov_iter *,
948 : gfp_t);
949 : extern void blk_execute_rq(struct gendisk *, struct request *, int);
950 : extern void blk_execute_rq_nowait(struct gendisk *,
951 : struct request *, int, rq_end_io_fn *);
952 :
953 : /* Helper to convert REQ_OP_XXX to its string format XXX */
954 : extern const char *blk_op_str(unsigned int op);
955 :
956 : int blk_status_to_errno(blk_status_t status);
957 : blk_status_t errno_to_blk_status(int errno);
958 :
959 : int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
960 :
961 4158 : static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
962 : {
963 4130 : return bdev->bd_disk->queue; /* this is never NULL */
964 : }
965 :
966 : /*
967 : * The basic unit of block I/O is a sector. It is used in a number of contexts
968 : * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
969 : * bytes. Variables of type sector_t represent an offset or size that is a
970 : * multiple of 512 bytes. Hence these two constants.
971 : */
972 : #ifndef SECTOR_SHIFT
973 : #define SECTOR_SHIFT 9
974 : #endif
975 : #ifndef SECTOR_SIZE
976 : #define SECTOR_SIZE (1 << SECTOR_SHIFT)
977 : #endif
978 :
979 : /*
980 : * blk_rq_pos() : the current sector
981 : * blk_rq_bytes() : bytes left in the entire request
982 : * blk_rq_cur_bytes() : bytes left in the current segment
983 : * blk_rq_err_bytes() : bytes left till the next error boundary
984 : * blk_rq_sectors() : sectors left in the entire request
985 : * blk_rq_cur_sectors() : sectors left in the current segment
986 : * blk_rq_stats_sectors() : sectors of the entire request used for stats
987 : */
988 21826 : static inline sector_t blk_rq_pos(const struct request *rq)
989 : {
990 7146 : return rq->__sector;
991 : }
992 :
993 19054 : static inline unsigned int blk_rq_bytes(const struct request *rq)
994 : {
995 4275 : return rq->__data_len;
996 : }
997 :
998 0 : static inline int blk_rq_cur_bytes(const struct request *rq)
999 : {
1000 0 : return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1001 : }
1002 :
1003 : extern unsigned int blk_rq_err_bytes(const struct request *rq);
1004 :
1005 14911 : static inline unsigned int blk_rq_sectors(const struct request *rq)
1006 : {
1007 14911 : return blk_rq_bytes(rq) >> SECTOR_SHIFT;
1008 : }
1009 :
1010 0 : static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1011 : {
1012 0 : return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
1013 : }
1014 :
1015 0 : static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
1016 : {
1017 0 : return rq->stats_sectors;
1018 : }
1019 :
1020 : #ifdef CONFIG_BLK_DEV_ZONED
1021 :
1022 : /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
1023 : const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
1024 :
1025 : static inline unsigned int blk_rq_zone_no(struct request *rq)
1026 : {
1027 : return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
1028 : }
1029 :
1030 : static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
1031 : {
1032 : return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
1033 : }
1034 : #endif /* CONFIG_BLK_DEV_ZONED */
1035 :
1036 : /*
1037 : * Some commands like WRITE SAME have a payload or data transfer size which
1038 : * is different from the size of the request. Any driver that supports such
1039 : * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1040 : * calculate the data transfer size.
1041 : */
1042 0 : static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1043 : {
1044 0 : if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1045 0 : return rq->special_vec.bv_len;
1046 0 : return blk_rq_bytes(rq);
1047 : }
1048 :
1049 : /*
1050 : * Return the first full biovec in the request. The caller needs to check that
1051 : * there are any bvecs before calling this helper.
1052 : */
1053 : static inline struct bio_vec req_bvec(struct request *rq)
1054 : {
1055 : if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1056 : return rq->special_vec;
1057 : return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
1058 : }
1059 :
1060 5486 : static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1061 : int op)
1062 : {
1063 5486 : if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1064 0 : return min(q->limits.max_discard_sectors,
1065 : UINT_MAX >> SECTOR_SHIFT);
1066 :
1067 5486 : if (unlikely(op == REQ_OP_WRITE_SAME))
1068 0 : return q->limits.max_write_same_sectors;
1069 :
1070 5486 : if (unlikely(op == REQ_OP_WRITE_ZEROES))
1071 0 : return q->limits.max_write_zeroes_sectors;
1072 :
1073 5486 : return q->limits.max_sectors;
1074 : }
1075 :
1076 : /*
1077 : * Return maximum size of a request at given offset. Only valid for
1078 : * file system requests.
1079 : */
1080 1464 : static inline unsigned int blk_max_size_offset(struct request_queue *q,
1081 : sector_t offset,
1082 : unsigned int chunk_sectors)
1083 : {
1084 1464 : if (!chunk_sectors) {
1085 1464 : if (q->limits.chunk_sectors)
1086 : chunk_sectors = q->limits.chunk_sectors;
1087 : else
1088 1464 : return q->limits.max_sectors;
1089 : }
1090 :
1091 0 : if (likely(is_power_of_2(chunk_sectors)))
1092 0 : chunk_sectors -= offset & (chunk_sectors - 1);
1093 : else
1094 0 : chunk_sectors -= sector_div(offset, chunk_sectors);
1095 :
1096 0 : return min(q->limits.max_sectors, chunk_sectors);
1097 : }
1098 :
1099 5486 : static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1100 : sector_t offset)
1101 : {
1102 5486 : struct request_queue *q = rq->q;
1103 :
1104 10972 : if (blk_rq_is_passthrough(rq))
1105 0 : return q->limits.max_hw_sectors;
1106 :
1107 5486 : if (!q->limits.chunk_sectors ||
1108 0 : req_op(rq) == REQ_OP_DISCARD ||
1109 : req_op(rq) == REQ_OP_SECURE_ERASE)
1110 5486 : return blk_queue_get_max_sectors(q, req_op(rq));
1111 :
1112 0 : return min(blk_max_size_offset(q, offset, 0),
1113 : blk_queue_get_max_sectors(q, req_op(rq)));
1114 : }
1115 :
1116 0 : static inline unsigned int blk_rq_count_bios(struct request *rq)
1117 : {
1118 0 : unsigned int nr_bios = 0;
1119 0 : struct bio *bio;
1120 :
1121 0 : __rq_for_each_bio(bio, rq)
1122 0 : nr_bios++;
1123 :
1124 0 : return nr_bios;
1125 : }
1126 :
1127 : void blk_steal_bios(struct bio_list *list, struct request *rq);
1128 :
1129 : /*
1130 : * Request completion related functions.
1131 : *
1132 : * blk_update_request() completes given number of bytes and updates
1133 : * the request without completing it.
1134 : */
1135 : extern bool blk_update_request(struct request *rq, blk_status_t error,
1136 : unsigned int nr_bytes);
1137 :
1138 : extern void blk_abort_request(struct request *);
1139 :
1140 : /*
1141 : * Access functions for manipulating queue properties
1142 : */
1143 : extern void blk_cleanup_queue(struct request_queue *);
1144 : extern void blk_queue_bounce_limit(struct request_queue *, u64);
1145 : extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1146 : extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1147 : extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1148 : extern void blk_queue_max_discard_segments(struct request_queue *,
1149 : unsigned short);
1150 : extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1151 : extern void blk_queue_max_discard_sectors(struct request_queue *q,
1152 : unsigned int max_discard_sectors);
1153 : extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1154 : unsigned int max_write_same_sectors);
1155 : extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1156 : unsigned int max_write_same_sectors);
1157 : extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
1158 : extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
1159 : unsigned int max_zone_append_sectors);
1160 : extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1161 : void blk_queue_zone_write_granularity(struct request_queue *q,
1162 : unsigned int size);
1163 : extern void blk_queue_alignment_offset(struct request_queue *q,
1164 : unsigned int alignment);
1165 : void blk_queue_update_readahead(struct request_queue *q);
1166 : extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1167 : extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1168 : extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1169 : extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1170 : extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1171 : extern void blk_set_default_limits(struct queue_limits *lim);
1172 : extern void blk_set_stacking_limits(struct queue_limits *lim);
1173 : extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1174 : sector_t offset);
1175 : extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1176 : sector_t offset);
1177 : extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1178 : extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1179 : extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1180 : extern void blk_queue_dma_alignment(struct request_queue *, int);
1181 : extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1182 : extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1183 : extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1184 : extern void blk_queue_required_elevator_features(struct request_queue *q,
1185 : unsigned int features);
1186 : extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
1187 : struct device *dev);
1188 :
1189 : /*
1190 : * Number of physical segments as sent to the device.
1191 : *
1192 : * Normally this is the number of discontiguous data segments sent by the
1193 : * submitter. But for data-less command like discard we might have no
1194 : * actual data segments submitted, but the driver might have to add it's
1195 : * own special payload. In that case we still return 1 here so that this
1196 : * special payload will be mapped.
1197 : */
1198 3372 : static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1199 : {
1200 3372 : if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1201 : return 1;
1202 3372 : return rq->nr_phys_segments;
1203 : }
1204 :
1205 : /*
1206 : * Number of discard segments (or ranges) the driver needs to fill in.
1207 : * Each discard bio merged into a request is counted as one segment.
1208 : */
1209 0 : static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1210 : {
1211 0 : return max_t(unsigned short, rq->nr_phys_segments, 1);
1212 : }
1213 :
1214 : int __blk_rq_map_sg(struct request_queue *q, struct request *rq,
1215 : struct scatterlist *sglist, struct scatterlist **last_sg);
1216 3434 : static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
1217 : struct scatterlist *sglist)
1218 : {
1219 3434 : struct scatterlist *last_sg = NULL;
1220 :
1221 3434 : return __blk_rq_map_sg(q, rq, sglist, &last_sg);
1222 : }
1223 : extern void blk_dump_rq_flags(struct request *, char *);
1224 :
1225 : bool __must_check blk_get_queue(struct request_queue *);
1226 : struct request_queue *blk_alloc_queue(int node_id);
1227 : extern void blk_put_queue(struct request_queue *);
1228 : extern void blk_set_queue_dying(struct request_queue *);
1229 :
1230 : #ifdef CONFIG_BLOCK
1231 : /*
1232 : * blk_plug permits building a queue of related requests by holding the I/O
1233 : * fragments for a short period. This allows merging of sequential requests
1234 : * into single larger request. As the requests are moved from a per-task list to
1235 : * the device's request_queue in a batch, this results in improved scalability
1236 : * as the lock contention for request_queue lock is reduced.
1237 : *
1238 : * It is ok not to disable preemption when adding the request to the plug list
1239 : * or when attempting a merge, because blk_schedule_flush_list() will only flush
1240 : * the plug list when the task sleeps by itself. For details, please see
1241 : * schedule() where blk_schedule_flush_plug() is called.
1242 : */
1243 : struct blk_plug {
1244 : struct list_head mq_list; /* blk-mq requests */
1245 : struct list_head cb_list; /* md requires an unplug callback */
1246 : unsigned short rq_count;
1247 : bool multiple_queues;
1248 : bool nowait;
1249 : };
1250 : #define BLK_MAX_REQUEST_COUNT 16
1251 : #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1252 :
1253 : struct blk_plug_cb;
1254 : typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1255 : struct blk_plug_cb {
1256 : struct list_head list;
1257 : blk_plug_cb_fn callback;
1258 : void *data;
1259 : };
1260 : extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1261 : void *data, int size);
1262 : extern void blk_start_plug(struct blk_plug *);
1263 : extern void blk_finish_plug(struct blk_plug *);
1264 : extern void blk_flush_plug_list(struct blk_plug *, bool);
1265 :
1266 2 : static inline void blk_flush_plug(struct task_struct *tsk)
1267 : {
1268 2 : struct blk_plug *plug = tsk->plug;
1269 :
1270 2 : if (plug)
1271 2 : blk_flush_plug_list(plug, false);
1272 2 : }
1273 :
1274 1875 : static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1275 : {
1276 1875 : struct blk_plug *plug = tsk->plug;
1277 :
1278 1875 : if (plug)
1279 14 : blk_flush_plug_list(plug, true);
1280 1875 : }
1281 :
1282 13944 : static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1283 : {
1284 13944 : struct blk_plug *plug = tsk->plug;
1285 :
1286 13958 : return plug &&
1287 14 : (!list_empty(&plug->mq_list) ||
1288 14 : !list_empty(&plug->cb_list));
1289 : }
1290 :
1291 : int blkdev_issue_flush(struct block_device *bdev);
1292 : long nr_blockdev_pages(void);
1293 : #else /* CONFIG_BLOCK */
1294 : struct blk_plug {
1295 : };
1296 :
1297 : static inline void blk_start_plug(struct blk_plug *plug)
1298 : {
1299 : }
1300 :
1301 : static inline void blk_finish_plug(struct blk_plug *plug)
1302 : {
1303 : }
1304 :
1305 : static inline void blk_flush_plug(struct task_struct *task)
1306 : {
1307 : }
1308 :
1309 : static inline void blk_schedule_flush_plug(struct task_struct *task)
1310 : {
1311 : }
1312 :
1313 :
1314 : static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1315 : {
1316 : return false;
1317 : }
1318 :
1319 : static inline int blkdev_issue_flush(struct block_device *bdev)
1320 : {
1321 : return 0;
1322 : }
1323 :
1324 : static inline long nr_blockdev_pages(void)
1325 : {
1326 : return 0;
1327 : }
1328 : #endif /* CONFIG_BLOCK */
1329 :
1330 : extern void blk_io_schedule(void);
1331 :
1332 : extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1333 : sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1334 :
1335 : #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1336 :
1337 : extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1338 : sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1339 : extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1340 : sector_t nr_sects, gfp_t gfp_mask, int flags,
1341 : struct bio **biop);
1342 :
1343 : #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1344 : #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1345 :
1346 : extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1347 : sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1348 : unsigned flags);
1349 : extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1350 : sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1351 :
1352 0 : static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1353 : sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1354 : {
1355 0 : return blkdev_issue_discard(sb->s_bdev,
1356 : block << (sb->s_blocksize_bits -
1357 : SECTOR_SHIFT),
1358 0 : nr_blocks << (sb->s_blocksize_bits -
1359 : SECTOR_SHIFT),
1360 : gfp_mask, flags);
1361 : }
1362 0 : static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1363 : sector_t nr_blocks, gfp_t gfp_mask)
1364 : {
1365 0 : return blkdev_issue_zeroout(sb->s_bdev,
1366 : block << (sb->s_blocksize_bits -
1367 : SECTOR_SHIFT),
1368 0 : nr_blocks << (sb->s_blocksize_bits -
1369 : SECTOR_SHIFT),
1370 : gfp_mask, 0);
1371 : }
1372 :
1373 : extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1374 :
1375 75 : static inline bool bdev_is_partition(struct block_device *bdev)
1376 : {
1377 65 : return bdev->bd_partno;
1378 : }
1379 :
1380 : enum blk_default_limits {
1381 : BLK_MAX_SEGMENTS = 128,
1382 : BLK_SAFE_MAX_SECTORS = 255,
1383 : BLK_DEF_MAX_SECTORS = 2560,
1384 : BLK_MAX_SEGMENT_SIZE = 65536,
1385 : BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1386 : };
1387 :
1388 8145 : static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1389 : {
1390 8145 : return q->limits.seg_boundary_mask;
1391 : }
1392 :
1393 10739 : static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1394 : {
1395 10739 : return q->limits.virt_boundary_mask;
1396 : }
1397 :
1398 9 : static inline unsigned int queue_max_sectors(const struct request_queue *q)
1399 : {
1400 9 : return q->limits.max_sectors;
1401 : }
1402 :
1403 4 : static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1404 : {
1405 4 : return q->limits.max_hw_sectors;
1406 : }
1407 :
1408 6952 : static inline unsigned short queue_max_segments(const struct request_queue *q)
1409 : {
1410 6952 : return q->limits.max_segments;
1411 : }
1412 :
1413 0 : static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1414 : {
1415 0 : return q->limits.max_discard_segments;
1416 : }
1417 :
1418 8145 : static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1419 : {
1420 8145 : return q->limits.max_segment_size;
1421 : }
1422 :
1423 0 : static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1424 : {
1425 :
1426 0 : const struct queue_limits *l = &q->limits;
1427 :
1428 0 : return min(l->max_zone_append_sectors, l->max_sectors);
1429 : }
1430 :
1431 5627 : static inline unsigned queue_logical_block_size(const struct request_queue *q)
1432 : {
1433 5627 : int retval = 512;
1434 :
1435 5627 : if (q && q->limits.logical_block_size)
1436 5627 : retval = q->limits.logical_block_size;
1437 :
1438 5627 : return retval;
1439 : }
1440 :
1441 4158 : static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1442 : {
1443 8316 : return queue_logical_block_size(bdev_get_queue(bdev));
1444 : }
1445 :
1446 1464 : static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1447 : {
1448 1464 : return q->limits.physical_block_size;
1449 : }
1450 :
1451 0 : static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1452 : {
1453 0 : return queue_physical_block_size(bdev_get_queue(bdev));
1454 : }
1455 :
1456 0 : static inline unsigned int queue_io_min(const struct request_queue *q)
1457 : {
1458 0 : return q->limits.io_min;
1459 : }
1460 :
1461 0 : static inline int bdev_io_min(struct block_device *bdev)
1462 : {
1463 0 : return queue_io_min(bdev_get_queue(bdev));
1464 : }
1465 :
1466 9 : static inline unsigned int queue_io_opt(const struct request_queue *q)
1467 : {
1468 9 : return q->limits.io_opt;
1469 : }
1470 :
1471 0 : static inline int bdev_io_opt(struct block_device *bdev)
1472 : {
1473 0 : return queue_io_opt(bdev_get_queue(bdev));
1474 : }
1475 :
1476 : static inline unsigned int
1477 0 : queue_zone_write_granularity(const struct request_queue *q)
1478 : {
1479 0 : return q->limits.zone_write_granularity;
1480 : }
1481 :
1482 : static inline unsigned int
1483 : bdev_zone_write_granularity(struct block_device *bdev)
1484 : {
1485 : return queue_zone_write_granularity(bdev_get_queue(bdev));
1486 : }
1487 :
1488 0 : static inline int queue_alignment_offset(const struct request_queue *q)
1489 : {
1490 0 : if (q->limits.misaligned)
1491 : return -1;
1492 :
1493 0 : return q->limits.alignment_offset;
1494 : }
1495 :
1496 0 : static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1497 : {
1498 0 : unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1499 0 : unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1500 : << SECTOR_SHIFT;
1501 :
1502 0 : return (granularity + lim->alignment_offset - alignment) % granularity;
1503 : }
1504 :
1505 0 : static inline int bdev_alignment_offset(struct block_device *bdev)
1506 : {
1507 0 : struct request_queue *q = bdev_get_queue(bdev);
1508 :
1509 0 : if (q->limits.misaligned)
1510 : return -1;
1511 0 : if (bdev_is_partition(bdev))
1512 0 : return queue_limit_alignment_offset(&q->limits,
1513 : bdev->bd_start_sect);
1514 0 : return q->limits.alignment_offset;
1515 : }
1516 :
1517 0 : static inline int queue_discard_alignment(const struct request_queue *q)
1518 : {
1519 0 : if (q->limits.discard_misaligned)
1520 : return -1;
1521 :
1522 0 : return q->limits.discard_alignment;
1523 : }
1524 :
1525 0 : static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1526 : {
1527 0 : unsigned int alignment, granularity, offset;
1528 :
1529 0 : if (!lim->max_discard_sectors)
1530 : return 0;
1531 :
1532 : /* Why are these in bytes, not sectors? */
1533 0 : alignment = lim->discard_alignment >> SECTOR_SHIFT;
1534 0 : granularity = lim->discard_granularity >> SECTOR_SHIFT;
1535 0 : if (!granularity)
1536 : return 0;
1537 :
1538 : /* Offset of the partition start in 'granularity' sectors */
1539 0 : offset = sector_div(sector, granularity);
1540 :
1541 : /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1542 0 : offset = (granularity + alignment - offset) % granularity;
1543 :
1544 : /* Turn it back into bytes, gaah */
1545 0 : return offset << SECTOR_SHIFT;
1546 : }
1547 :
1548 : static inline int bdev_discard_alignment(struct block_device *bdev)
1549 : {
1550 : struct request_queue *q = bdev_get_queue(bdev);
1551 :
1552 : if (bdev_is_partition(bdev))
1553 : return queue_limit_discard_alignment(&q->limits,
1554 : bdev->bd_start_sect);
1555 : return q->limits.discard_alignment;
1556 : }
1557 :
1558 0 : static inline unsigned int bdev_write_same(struct block_device *bdev)
1559 : {
1560 0 : struct request_queue *q = bdev_get_queue(bdev);
1561 :
1562 0 : if (q)
1563 0 : return q->limits.max_write_same_sectors;
1564 :
1565 : return 0;
1566 : }
1567 :
1568 0 : static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1569 : {
1570 0 : struct request_queue *q = bdev_get_queue(bdev);
1571 :
1572 0 : if (q)
1573 0 : return q->limits.max_write_zeroes_sectors;
1574 :
1575 : return 0;
1576 : }
1577 :
1578 0 : static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1579 : {
1580 0 : struct request_queue *q = bdev_get_queue(bdev);
1581 :
1582 0 : if (q)
1583 : return blk_queue_zoned_model(q);
1584 :
1585 : return BLK_ZONED_NONE;
1586 : }
1587 :
1588 : static inline bool bdev_is_zoned(struct block_device *bdev)
1589 : {
1590 : struct request_queue *q = bdev_get_queue(bdev);
1591 :
1592 : if (q)
1593 : return blk_queue_is_zoned(q);
1594 :
1595 : return false;
1596 : }
1597 :
1598 0 : static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1599 : {
1600 0 : struct request_queue *q = bdev_get_queue(bdev);
1601 :
1602 0 : if (q)
1603 : return blk_queue_zone_sectors(q);
1604 : return 0;
1605 : }
1606 :
1607 : static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
1608 : {
1609 : struct request_queue *q = bdev_get_queue(bdev);
1610 :
1611 : if (q)
1612 : return queue_max_open_zones(q);
1613 : return 0;
1614 : }
1615 :
1616 : static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
1617 : {
1618 : struct request_queue *q = bdev_get_queue(bdev);
1619 :
1620 : if (q)
1621 : return queue_max_active_zones(q);
1622 : return 0;
1623 : }
1624 :
1625 2 : static inline int queue_dma_alignment(const struct request_queue *q)
1626 : {
1627 2 : return q ? q->dma_alignment : 511;
1628 : }
1629 :
1630 2 : static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1631 : unsigned int len)
1632 : {
1633 2 : unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1634 2 : return !(addr & alignment) && !(len & alignment);
1635 : }
1636 :
1637 : /* assumes size > 256 */
1638 3 : static inline unsigned int blksize_bits(unsigned int size)
1639 : {
1640 10 : unsigned int bits = 8;
1641 16604 : do {
1642 16604 : bits++;
1643 16604 : size >>= 1;
1644 16604 : } while (size > 256);
1645 4142 : return bits;
1646 : }
1647 :
1648 2 : static inline unsigned int block_size(struct block_device *bdev)
1649 : {
1650 2 : return 1 << bdev->bd_inode->i_blkbits;
1651 : }
1652 :
1653 : int kblockd_schedule_work(struct work_struct *work);
1654 : int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1655 :
1656 : #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1657 : MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1658 : #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1659 : MODULE_ALIAS("block-major-" __stringify(major) "-*")
1660 :
1661 : #if defined(CONFIG_BLK_DEV_INTEGRITY)
1662 :
1663 : enum blk_integrity_flags {
1664 : BLK_INTEGRITY_VERIFY = 1 << 0,
1665 : BLK_INTEGRITY_GENERATE = 1 << 1,
1666 : BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1667 : BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1668 : };
1669 :
1670 : struct blk_integrity_iter {
1671 : void *prot_buf;
1672 : void *data_buf;
1673 : sector_t seed;
1674 : unsigned int data_size;
1675 : unsigned short interval;
1676 : const char *disk_name;
1677 : };
1678 :
1679 : typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1680 : typedef void (integrity_prepare_fn) (struct request *);
1681 : typedef void (integrity_complete_fn) (struct request *, unsigned int);
1682 :
1683 : struct blk_integrity_profile {
1684 : integrity_processing_fn *generate_fn;
1685 : integrity_processing_fn *verify_fn;
1686 : integrity_prepare_fn *prepare_fn;
1687 : integrity_complete_fn *complete_fn;
1688 : const char *name;
1689 : };
1690 :
1691 : extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1692 : extern void blk_integrity_unregister(struct gendisk *);
1693 : extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1694 : extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1695 : struct scatterlist *);
1696 : extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1697 :
1698 : static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1699 : {
1700 : struct blk_integrity *bi = &disk->queue->integrity;
1701 :
1702 : if (!bi->profile)
1703 : return NULL;
1704 :
1705 : return bi;
1706 : }
1707 :
1708 : static inline
1709 : struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1710 : {
1711 : return blk_get_integrity(bdev->bd_disk);
1712 : }
1713 :
1714 : static inline bool
1715 : blk_integrity_queue_supports_integrity(struct request_queue *q)
1716 : {
1717 : return q->integrity.profile;
1718 : }
1719 :
1720 : static inline bool blk_integrity_rq(struct request *rq)
1721 : {
1722 : return rq->cmd_flags & REQ_INTEGRITY;
1723 : }
1724 :
1725 : static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1726 : unsigned int segs)
1727 : {
1728 : q->limits.max_integrity_segments = segs;
1729 : }
1730 :
1731 : static inline unsigned short
1732 : queue_max_integrity_segments(const struct request_queue *q)
1733 : {
1734 : return q->limits.max_integrity_segments;
1735 : }
1736 :
1737 : /**
1738 : * bio_integrity_intervals - Return number of integrity intervals for a bio
1739 : * @bi: blk_integrity profile for device
1740 : * @sectors: Size of the bio in 512-byte sectors
1741 : *
1742 : * Description: The block layer calculates everything in 512 byte
1743 : * sectors but integrity metadata is done in terms of the data integrity
1744 : * interval size of the storage device. Convert the block layer sectors
1745 : * to the appropriate number of integrity intervals.
1746 : */
1747 : static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1748 : unsigned int sectors)
1749 : {
1750 : return sectors >> (bi->interval_exp - 9);
1751 : }
1752 :
1753 : static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1754 : unsigned int sectors)
1755 : {
1756 : return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1757 : }
1758 :
1759 : /*
1760 : * Return the first bvec that contains integrity data. Only drivers that are
1761 : * limited to a single integrity segment should use this helper.
1762 : */
1763 : static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1764 : {
1765 : if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
1766 : return NULL;
1767 : return rq->bio->bi_integrity->bip_vec;
1768 : }
1769 :
1770 : #else /* CONFIG_BLK_DEV_INTEGRITY */
1771 :
1772 : struct bio;
1773 : struct block_device;
1774 : struct gendisk;
1775 : struct blk_integrity;
1776 :
1777 5486 : static inline int blk_integrity_rq(struct request *rq)
1778 : {
1779 5486 : return 0;
1780 : }
1781 : static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1782 : struct bio *b)
1783 : {
1784 : return 0;
1785 : }
1786 : static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1787 : struct bio *b,
1788 : struct scatterlist *s)
1789 : {
1790 : return 0;
1791 : }
1792 0 : static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1793 : {
1794 0 : return NULL;
1795 : }
1796 0 : static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1797 : {
1798 0 : return NULL;
1799 : }
1800 : static inline bool
1801 : blk_integrity_queue_supports_integrity(struct request_queue *q)
1802 : {
1803 : return false;
1804 : }
1805 0 : static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1806 : {
1807 0 : return 0;
1808 : }
1809 0 : static inline void blk_integrity_register(struct gendisk *d,
1810 : struct blk_integrity *b)
1811 : {
1812 0 : }
1813 : static inline void blk_integrity_unregister(struct gendisk *d)
1814 : {
1815 : }
1816 : static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1817 : unsigned int segs)
1818 : {
1819 : }
1820 : static inline unsigned short queue_max_integrity_segments(const struct request_queue *q)
1821 : {
1822 : return 0;
1823 : }
1824 :
1825 : static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1826 : unsigned int sectors)
1827 : {
1828 : return 0;
1829 : }
1830 :
1831 : static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1832 : unsigned int sectors)
1833 : {
1834 : return 0;
1835 : }
1836 :
1837 : static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1838 : {
1839 : return NULL;
1840 : }
1841 :
1842 : #endif /* CONFIG_BLK_DEV_INTEGRITY */
1843 :
1844 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1845 :
1846 : bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q);
1847 :
1848 : void blk_ksm_unregister(struct request_queue *q);
1849 :
1850 : #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1851 :
1852 : static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm,
1853 : struct request_queue *q)
1854 : {
1855 : return true;
1856 : }
1857 :
1858 : static inline void blk_ksm_unregister(struct request_queue *q) { }
1859 :
1860 : #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1861 :
1862 :
1863 : struct block_device_operations {
1864 : blk_qc_t (*submit_bio) (struct bio *bio);
1865 : int (*open) (struct block_device *, fmode_t);
1866 : void (*release) (struct gendisk *, fmode_t);
1867 : int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1868 : int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1869 : int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1870 : unsigned int (*check_events) (struct gendisk *disk,
1871 : unsigned int clearing);
1872 : void (*unlock_native_capacity) (struct gendisk *);
1873 : int (*revalidate_disk) (struct gendisk *);
1874 : int (*getgeo)(struct block_device *, struct hd_geometry *);
1875 : int (*set_read_only)(struct block_device *bdev, bool ro);
1876 : /* this callback is with swap_lock and sometimes page table lock held */
1877 : void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1878 : int (*report_zones)(struct gendisk *, sector_t sector,
1879 : unsigned int nr_zones, report_zones_cb cb, void *data);
1880 : char *(*devnode)(struct gendisk *disk, umode_t *mode);
1881 : struct module *owner;
1882 : const struct pr_ops *pr_ops;
1883 : };
1884 :
1885 : #ifdef CONFIG_COMPAT
1886 : extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1887 : unsigned int, unsigned long);
1888 : #else
1889 : #define blkdev_compat_ptr_ioctl NULL
1890 : #endif
1891 :
1892 : extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1893 : extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1894 : struct writeback_control *);
1895 :
1896 : #ifdef CONFIG_BLK_DEV_ZONED
1897 : bool blk_req_needs_zone_write_lock(struct request *rq);
1898 : bool blk_req_zone_write_trylock(struct request *rq);
1899 : void __blk_req_zone_write_lock(struct request *rq);
1900 : void __blk_req_zone_write_unlock(struct request *rq);
1901 :
1902 : static inline void blk_req_zone_write_lock(struct request *rq)
1903 : {
1904 : if (blk_req_needs_zone_write_lock(rq))
1905 : __blk_req_zone_write_lock(rq);
1906 : }
1907 :
1908 : static inline void blk_req_zone_write_unlock(struct request *rq)
1909 : {
1910 : if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1911 : __blk_req_zone_write_unlock(rq);
1912 : }
1913 :
1914 : static inline bool blk_req_zone_is_write_locked(struct request *rq)
1915 : {
1916 : return rq->q->seq_zones_wlock &&
1917 : test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1918 : }
1919 :
1920 : static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1921 : {
1922 : if (!blk_req_needs_zone_write_lock(rq))
1923 : return true;
1924 : return !blk_req_zone_is_write_locked(rq);
1925 : }
1926 : #else
1927 : static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1928 : {
1929 : return false;
1930 : }
1931 :
1932 : static inline void blk_req_zone_write_lock(struct request *rq)
1933 : {
1934 : }
1935 :
1936 : static inline void blk_req_zone_write_unlock(struct request *rq)
1937 : {
1938 : }
1939 : static inline bool blk_req_zone_is_write_locked(struct request *rq)
1940 : {
1941 : return false;
1942 : }
1943 :
1944 : static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1945 : {
1946 : return true;
1947 : }
1948 : #endif /* CONFIG_BLK_DEV_ZONED */
1949 :
1950 0 : static inline void blk_wake_io_task(struct task_struct *waiter)
1951 : {
1952 : /*
1953 : * If we're polling, the task itself is doing the completions. For
1954 : * that case, we don't need to signal a wakeup, it's enough to just
1955 : * mark us as RUNNING.
1956 : */
1957 0 : if (waiter == current)
1958 0 : __set_current_state(TASK_RUNNING);
1959 : else
1960 0 : wake_up_process(waiter);
1961 0 : }
1962 :
1963 : unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
1964 : unsigned int op);
1965 : void disk_end_io_acct(struct gendisk *disk, unsigned int op,
1966 : unsigned long start_time);
1967 :
1968 : unsigned long bio_start_io_acct(struct bio *bio);
1969 : void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1970 : struct block_device *orig_bdev);
1971 :
1972 : /**
1973 : * bio_end_io_acct - end I/O accounting for bio based drivers
1974 : * @bio: bio to end account for
1975 : * @start: start time returned by bio_start_io_acct()
1976 : */
1977 0 : static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1978 : {
1979 0 : return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1980 : }
1981 :
1982 : int bdev_read_only(struct block_device *bdev);
1983 : int set_blocksize(struct block_device *bdev, int size);
1984 :
1985 : const char *bdevname(struct block_device *bdev, char *buffer);
1986 : int lookup_bdev(const char *pathname, dev_t *dev);
1987 :
1988 : void blkdev_show(struct seq_file *seqf, off_t offset);
1989 :
1990 : #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1991 : #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1992 : #ifdef CONFIG_BLOCK
1993 : #define BLKDEV_MAJOR_MAX 512
1994 : #else
1995 : #define BLKDEV_MAJOR_MAX 0
1996 : #endif
1997 :
1998 : struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1999 : void *holder);
2000 : struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
2001 : int bd_prepare_to_claim(struct block_device *bdev, void *holder);
2002 : void bd_abort_claiming(struct block_device *bdev, void *holder);
2003 : void blkdev_put(struct block_device *bdev, fmode_t mode);
2004 :
2005 : /* just for blk-cgroup, don't use elsewhere */
2006 : struct block_device *blkdev_get_no_open(dev_t dev);
2007 : void blkdev_put_no_open(struct block_device *bdev);
2008 :
2009 : struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
2010 : void bdev_add(struct block_device *bdev, dev_t dev);
2011 : struct block_device *I_BDEV(struct inode *inode);
2012 : struct block_device *bdgrab(struct block_device *bdev);
2013 : void bdput(struct block_device *);
2014 : int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
2015 : loff_t lend);
2016 :
2017 : #ifdef CONFIG_BLOCK
2018 : void invalidate_bdev(struct block_device *bdev);
2019 : int sync_blockdev(struct block_device *bdev);
2020 : #else
2021 : static inline void invalidate_bdev(struct block_device *bdev)
2022 : {
2023 : }
2024 : static inline int sync_blockdev(struct block_device *bdev)
2025 : {
2026 : return 0;
2027 : }
2028 : #endif
2029 : int fsync_bdev(struct block_device *bdev);
2030 :
2031 : int freeze_bdev(struct block_device *bdev);
2032 : int thaw_bdev(struct block_device *bdev);
2033 :
2034 : #endif /* _LINUX_BLKDEV_H */
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