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 | |
8 | #ifdef CONFIG_BLOCK |
9 | |
10 | #include <linux/major.h> |
11 | #include <linux/genhd.h> |
12 | #include <linux/list.h> |
13 | #include <linux/llist.h> |
14 | #include <linux/timer.h> |
15 | #include <linux/workqueue.h> |
16 | #include <linux/pagemap.h> |
17 | #include <linux/backing-dev-defs.h> |
18 | #include <linux/wait.h> |
19 | #include <linux/mempool.h> |
20 | #include <linux/pfn.h> |
21 | #include <linux/bio.h> |
22 | #include <linux/stringify.h> |
23 | #include <linux/gfp.h> |
24 | #include <linux/bsg.h> |
25 | #include <linux/smp.h> |
26 | #include <linux/rcupdate.h> |
27 | #include <linux/percpu-refcount.h> |
28 | #include <linux/scatterlist.h> |
29 | #include <linux/blkzoned.h> |
30 | |
31 | struct module; |
32 | struct scsi_ioctl_command; |
33 | |
34 | struct request_queue; |
35 | struct elevator_queue; |
36 | struct blk_trace; |
37 | struct request; |
38 | struct sg_io_hdr; |
39 | struct bsg_job; |
40 | struct blkcg_gq; |
41 | struct blk_flush_queue; |
42 | struct pr_ops; |
43 | struct rq_qos; |
44 | struct blk_queue_stats; |
45 | struct blk_stat_callback; |
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 | /* elevator knows about this request */ |
69 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) |
70 | /* drive already may have started this one */ |
71 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) |
72 | /* may not be passed by ioscheduler */ |
73 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) |
74 | /* request for flush sequence */ |
75 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) |
76 | /* merge of different types, fail separately */ |
77 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) |
78 | /* track inflight for MQ */ |
79 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) |
80 | /* don't call prep for this one */ |
81 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) |
82 | /* set for "ide_preempt" requests and also for requests for which the SCSI |
83 | "quiesce" state must be ignored. */ |
84 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) |
85 | /* contains copies of user pages */ |
86 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) |
87 | /* vaguely specified driver internal error. Ignored by the block layer */ |
88 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) |
89 | /* don't warn about errors */ |
90 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) |
91 | /* elevator private data attached */ |
92 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) |
93 | /* account into disk and partition IO statistics */ |
94 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) |
95 | /* request came from our alloc pool */ |
96 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) |
97 | /* runtime pm request */ |
98 | #define RQF_PM ((__force req_flags_t)(1 << 15)) |
99 | /* on IO scheduler merge hash */ |
100 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) |
101 | /* track IO completion time */ |
102 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) |
103 | /* Look at ->special_vec for the actual data payload instead of the |
104 | bio chain. */ |
105 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) |
106 | /* The per-zone write lock is held for this request */ |
107 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) |
108 | /* already slept for hybrid poll */ |
109 | #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) |
110 | /* ->timeout has been called, don't expire again */ |
111 | #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) |
112 | |
113 | /* flags that prevent us from merging requests: */ |
114 | #define RQF_NOMERGE_FLAGS \ |
115 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
116 | |
117 | /* |
118 | * Request state for blk-mq. |
119 | */ |
120 | enum mq_rq_state { |
121 | MQ_RQ_IDLE = 0, |
122 | MQ_RQ_IN_FLIGHT = 1, |
123 | MQ_RQ_COMPLETE = 2, |
124 | }; |
125 | |
126 | /* |
127 | * Try to put the fields that are referenced together in the same cacheline. |
128 | * |
129 | * If you modify this structure, make sure to update blk_rq_init() and |
130 | * especially blk_mq_rq_ctx_init() to take care of the added fields. |
131 | */ |
132 | struct request { |
133 | struct request_queue *q; |
134 | struct blk_mq_ctx *mq_ctx; |
135 | struct blk_mq_hw_ctx *mq_hctx; |
136 | |
137 | unsigned int cmd_flags; /* op and common flags */ |
138 | req_flags_t rq_flags; |
139 | |
140 | int internal_tag; |
141 | |
142 | /* the following two fields are internal, NEVER access directly */ |
143 | unsigned int __data_len; /* total data len */ |
144 | int tag; |
145 | sector_t __sector; /* sector cursor */ |
146 | |
147 | struct bio *bio; |
148 | struct bio *biotail; |
149 | |
150 | struct list_head queuelist; |
151 | |
152 | /* |
153 | * The hash is used inside the scheduler, and killed once the |
154 | * request reaches the dispatch list. The ipi_list is only used |
155 | * to queue the request for softirq completion, which is long |
156 | * after the request has been unhashed (and even removed from |
157 | * the dispatch list). |
158 | */ |
159 | union { |
160 | struct hlist_node hash; /* merge hash */ |
161 | struct list_head ipi_list; |
162 | }; |
163 | |
164 | /* |
165 | * The rb_node is only used inside the io scheduler, requests |
166 | * are pruned when moved to the dispatch queue. So let the |
167 | * completion_data share space with the rb_node. |
168 | */ |
169 | union { |
170 | struct rb_node rb_node; /* sort/lookup */ |
171 | struct bio_vec special_vec; |
172 | void *completion_data; |
173 | int error_count; /* for legacy drivers, don't use */ |
174 | }; |
175 | |
176 | /* |
177 | * Three pointers are available for the IO schedulers, if they need |
178 | * more they have to dynamically allocate it. Flush requests are |
179 | * never put on the IO scheduler. So let the flush fields share |
180 | * space with the elevator data. |
181 | */ |
182 | union { |
183 | struct { |
184 | struct io_cq *icq; |
185 | void *priv[2]; |
186 | } elv; |
187 | |
188 | struct { |
189 | unsigned int seq; |
190 | struct list_head list; |
191 | rq_end_io_fn *saved_end_io; |
192 | } flush; |
193 | }; |
194 | |
195 | struct gendisk *rq_disk; |
196 | struct hd_struct *part; |
197 | /* Time that I/O was submitted to the kernel. */ |
198 | u64 start_time_ns; |
199 | /* Time that I/O was submitted to the device. */ |
200 | u64 io_start_time_ns; |
201 | |
202 | #ifdef CONFIG_BLK_WBT |
203 | unsigned short wbt_flags; |
204 | #endif |
205 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
206 | unsigned short throtl_size; |
207 | #endif |
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 | unsigned short write_hint; |
220 | unsigned short ioprio; |
221 | |
222 | unsigned int ; /* length of alignment and padding */ |
223 | |
224 | enum mq_rq_state state; |
225 | refcount_t ref; |
226 | |
227 | unsigned int timeout; |
228 | unsigned long deadline; |
229 | |
230 | union { |
231 | struct __call_single_data csd; |
232 | u64 fifo_time; |
233 | }; |
234 | |
235 | /* |
236 | * completion callback. |
237 | */ |
238 | rq_end_io_fn *end_io; |
239 | void *end_io_data; |
240 | }; |
241 | |
242 | static inline bool blk_op_is_scsi(unsigned int op) |
243 | { |
244 | return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; |
245 | } |
246 | |
247 | static inline bool blk_op_is_private(unsigned int op) |
248 | { |
249 | return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; |
250 | } |
251 | |
252 | static inline bool blk_rq_is_scsi(struct request *rq) |
253 | { |
254 | return blk_op_is_scsi(req_op(rq)); |
255 | } |
256 | |
257 | static inline bool blk_rq_is_private(struct request *rq) |
258 | { |
259 | return blk_op_is_private(req_op(rq)); |
260 | } |
261 | |
262 | static inline bool blk_rq_is_passthrough(struct request *rq) |
263 | { |
264 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
265 | } |
266 | |
267 | static inline bool bio_is_passthrough(struct bio *bio) |
268 | { |
269 | unsigned op = bio_op(bio); |
270 | |
271 | return blk_op_is_scsi(op) || blk_op_is_private(op); |
272 | } |
273 | |
274 | static inline unsigned short req_get_ioprio(struct request *req) |
275 | { |
276 | return req->ioprio; |
277 | } |
278 | |
279 | #include <linux/elevator.h> |
280 | |
281 | struct blk_queue_ctx; |
282 | |
283 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
284 | |
285 | struct bio_vec; |
286 | typedef int (dma_drain_needed_fn)(struct request *); |
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 | enum blk_zoned_model { |
308 | BLK_ZONED_NONE, /* Regular block device */ |
309 | BLK_ZONED_HA, /* Host-aware zoned block device */ |
310 | BLK_ZONED_HM, /* Host-managed zoned block device */ |
311 | }; |
312 | |
313 | struct queue_limits { |
314 | unsigned long bounce_pfn; |
315 | unsigned long seg_boundary_mask; |
316 | unsigned long virt_boundary_mask; |
317 | |
318 | unsigned int max_hw_sectors; |
319 | unsigned int max_dev_sectors; |
320 | unsigned int chunk_sectors; |
321 | unsigned int max_sectors; |
322 | unsigned int max_segment_size; |
323 | unsigned int physical_block_size; |
324 | unsigned int alignment_offset; |
325 | unsigned int io_min; |
326 | unsigned int io_opt; |
327 | unsigned int max_discard_sectors; |
328 | unsigned int max_hw_discard_sectors; |
329 | unsigned int max_write_same_sectors; |
330 | unsigned int max_write_zeroes_sectors; |
331 | unsigned int discard_granularity; |
332 | unsigned int discard_alignment; |
333 | |
334 | unsigned short logical_block_size; |
335 | unsigned short max_segments; |
336 | unsigned short max_integrity_segments; |
337 | unsigned short max_discard_segments; |
338 | |
339 | unsigned char misaligned; |
340 | unsigned char discard_misaligned; |
341 | unsigned char raid_partial_stripes_expensive; |
342 | enum blk_zoned_model zoned; |
343 | }; |
344 | |
345 | #ifdef CONFIG_BLK_DEV_ZONED |
346 | |
347 | extern unsigned int blkdev_nr_zones(struct block_device *bdev); |
348 | extern int blkdev_report_zones(struct block_device *bdev, |
349 | sector_t sector, struct blk_zone *zones, |
350 | unsigned int *nr_zones, gfp_t gfp_mask); |
351 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, |
352 | sector_t nr_sectors, gfp_t gfp_mask); |
353 | extern int blk_revalidate_disk_zones(struct gendisk *disk); |
354 | |
355 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
356 | unsigned int cmd, unsigned long arg); |
357 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, |
358 | unsigned int cmd, unsigned long arg); |
359 | |
360 | #else /* CONFIG_BLK_DEV_ZONED */ |
361 | |
362 | static inline unsigned int blkdev_nr_zones(struct block_device *bdev) |
363 | { |
364 | return 0; |
365 | } |
366 | |
367 | static inline int blk_revalidate_disk_zones(struct gendisk *disk) |
368 | { |
369 | return 0; |
370 | } |
371 | |
372 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, |
373 | fmode_t mode, unsigned int cmd, |
374 | unsigned long arg) |
375 | { |
376 | return -ENOTTY; |
377 | } |
378 | |
379 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, |
380 | fmode_t mode, unsigned int cmd, |
381 | unsigned long arg) |
382 | { |
383 | return -ENOTTY; |
384 | } |
385 | |
386 | #endif /* CONFIG_BLK_DEV_ZONED */ |
387 | |
388 | struct request_queue { |
389 | /* |
390 | * Together with queue_head for cacheline sharing |
391 | */ |
392 | struct list_head queue_head; |
393 | struct request *last_merge; |
394 | struct elevator_queue *elevator; |
395 | |
396 | struct blk_queue_stats *stats; |
397 | struct rq_qos *rq_qos; |
398 | |
399 | make_request_fn *make_request_fn; |
400 | dma_drain_needed_fn *dma_drain_needed; |
401 | |
402 | const struct blk_mq_ops *mq_ops; |
403 | |
404 | /* sw queues */ |
405 | struct blk_mq_ctx __percpu *queue_ctx; |
406 | unsigned int nr_queues; |
407 | |
408 | unsigned int queue_depth; |
409 | |
410 | /* hw dispatch queues */ |
411 | struct blk_mq_hw_ctx **queue_hw_ctx; |
412 | unsigned int nr_hw_queues; |
413 | |
414 | struct backing_dev_info *backing_dev_info; |
415 | |
416 | /* |
417 | * The queue owner gets to use this for whatever they like. |
418 | * ll_rw_blk doesn't touch it. |
419 | */ |
420 | void *queuedata; |
421 | |
422 | /* |
423 | * various queue flags, see QUEUE_* below |
424 | */ |
425 | unsigned long queue_flags; |
426 | /* |
427 | * Number of contexts that have called blk_set_pm_only(). If this |
428 | * counter is above zero then only RQF_PM and RQF_PREEMPT requests are |
429 | * 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 | int rpm_status; |
463 | unsigned int nr_pending; |
464 | #endif |
465 | |
466 | /* |
467 | * queue settings |
468 | */ |
469 | unsigned long nr_requests; /* Max # of requests */ |
470 | |
471 | unsigned int dma_drain_size; |
472 | void *dma_drain_buffer; |
473 | unsigned int dma_pad_mask; |
474 | unsigned int dma_alignment; |
475 | |
476 | unsigned int rq_timeout; |
477 | int poll_nsec; |
478 | |
479 | struct blk_stat_callback *poll_cb; |
480 | struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
481 | |
482 | struct timer_list timeout; |
483 | struct work_struct timeout_work; |
484 | |
485 | struct list_head icq_list; |
486 | #ifdef CONFIG_BLK_CGROUP |
487 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
488 | struct blkcg_gq *root_blkg; |
489 | struct list_head blkg_list; |
490 | #endif |
491 | |
492 | struct queue_limits limits; |
493 | |
494 | #ifdef CONFIG_BLK_DEV_ZONED |
495 | /* |
496 | * Zoned block device information for request dispatch control. |
497 | * nr_zones is the total number of zones of the device. This is always |
498 | * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones |
499 | * bits which indicates if a zone is conventional (bit clear) or |
500 | * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones |
501 | * bits which indicates if a zone is write locked, that is, if a write |
502 | * request targeting the zone was dispatched. All three fields are |
503 | * initialized by the low level device driver (e.g. scsi/sd.c). |
504 | * Stacking drivers (device mappers) may or may not initialize |
505 | * these fields. |
506 | * |
507 | * Reads of this information must be protected with blk_queue_enter() / |
508 | * blk_queue_exit(). Modifying this information is only allowed while |
509 | * no requests are being processed. See also blk_mq_freeze_queue() and |
510 | * blk_mq_unfreeze_queue(). |
511 | */ |
512 | unsigned int nr_zones; |
513 | unsigned long *seq_zones_bitmap; |
514 | unsigned long *seq_zones_wlock; |
515 | #endif /* CONFIG_BLK_DEV_ZONED */ |
516 | |
517 | /* |
518 | * sg stuff |
519 | */ |
520 | unsigned int sg_timeout; |
521 | unsigned int sg_reserved_size; |
522 | int node; |
523 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
524 | struct blk_trace *blk_trace; |
525 | struct mutex blk_trace_mutex; |
526 | #endif |
527 | /* |
528 | * for flush operations |
529 | */ |
530 | struct blk_flush_queue *fq; |
531 | |
532 | struct list_head requeue_list; |
533 | spinlock_t requeue_lock; |
534 | struct delayed_work requeue_work; |
535 | |
536 | struct mutex sysfs_lock; |
537 | |
538 | atomic_t mq_freeze_depth; |
539 | |
540 | #if defined(CONFIG_BLK_DEV_BSG) |
541 | struct bsg_class_device bsg_dev; |
542 | #endif |
543 | |
544 | #ifdef CONFIG_BLK_DEV_THROTTLING |
545 | /* Throttle data */ |
546 | struct throtl_data *td; |
547 | #endif |
548 | struct rcu_head rcu_head; |
549 | wait_queue_head_t mq_freeze_wq; |
550 | struct percpu_ref q_usage_counter; |
551 | struct list_head all_q_node; |
552 | |
553 | struct blk_mq_tag_set *tag_set; |
554 | struct list_head tag_set_list; |
555 | struct bio_set bio_split; |
556 | |
557 | #ifdef CONFIG_BLK_DEBUG_FS |
558 | struct dentry *debugfs_dir; |
559 | struct dentry *sched_debugfs_dir; |
560 | struct dentry *rqos_debugfs_dir; |
561 | #endif |
562 | |
563 | bool mq_sysfs_init_done; |
564 | |
565 | size_t cmd_size; |
566 | |
567 | struct work_struct release_work; |
568 | |
569 | #define BLK_MAX_WRITE_HINTS 5 |
570 | u64 write_hints[BLK_MAX_WRITE_HINTS]; |
571 | }; |
572 | |
573 | #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ |
574 | #define QUEUE_FLAG_DYING 1 /* queue being torn down */ |
575 | #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ |
576 | #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ |
577 | #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ |
578 | #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ |
579 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
580 | #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ |
581 | #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ |
582 | #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ |
583 | #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ |
584 | #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ |
585 | #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ |
586 | #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ |
587 | #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ |
588 | #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ |
589 | #define QUEUE_FLAG_WC 17 /* Write back caching */ |
590 | #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ |
591 | #define QUEUE_FLAG_DAX 19 /* device supports DAX */ |
592 | #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ |
593 | #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ |
594 | #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ |
595 | #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ |
596 | #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ |
597 | #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ |
598 | |
599 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
600 | (1 << QUEUE_FLAG_SAME_COMP)) |
601 | |
602 | void blk_queue_flag_set(unsigned int flag, struct request_queue *q); |
603 | void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); |
604 | bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); |
605 | |
606 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
607 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
608 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
609 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
610 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
611 | #define blk_queue_noxmerges(q) \ |
612 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
613 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
614 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
615 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
616 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
617 | #define blk_queue_secure_erase(q) \ |
618 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) |
619 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
620 | #define blk_queue_scsi_passthrough(q) \ |
621 | test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) |
622 | #define blk_queue_pci_p2pdma(q) \ |
623 | test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) |
624 | |
625 | #define blk_noretry_request(rq) \ |
626 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
627 | REQ_FAILFAST_DRIVER)) |
628 | #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
629 | #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) |
630 | #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) |
631 | |
632 | extern void blk_set_pm_only(struct request_queue *q); |
633 | extern void blk_clear_pm_only(struct request_queue *q); |
634 | |
635 | static inline bool blk_account_rq(struct request *rq) |
636 | { |
637 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); |
638 | } |
639 | |
640 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
641 | |
642 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
643 | |
644 | static inline bool queue_is_mq(struct request_queue *q) |
645 | { |
646 | return q->mq_ops; |
647 | } |
648 | |
649 | static inline enum blk_zoned_model |
650 | blk_queue_zoned_model(struct request_queue *q) |
651 | { |
652 | return q->limits.zoned; |
653 | } |
654 | |
655 | static inline bool blk_queue_is_zoned(struct request_queue *q) |
656 | { |
657 | switch (blk_queue_zoned_model(q)) { |
658 | case BLK_ZONED_HA: |
659 | case BLK_ZONED_HM: |
660 | return true; |
661 | default: |
662 | return false; |
663 | } |
664 | } |
665 | |
666 | static inline unsigned int blk_queue_zone_sectors(struct request_queue *q) |
667 | { |
668 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; |
669 | } |
670 | |
671 | #ifdef CONFIG_BLK_DEV_ZONED |
672 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
673 | { |
674 | return blk_queue_is_zoned(q) ? q->nr_zones : 0; |
675 | } |
676 | |
677 | static inline unsigned int blk_queue_zone_no(struct request_queue *q, |
678 | sector_t sector) |
679 | { |
680 | if (!blk_queue_is_zoned(q)) |
681 | return 0; |
682 | return sector >> ilog2(q->limits.chunk_sectors); |
683 | } |
684 | |
685 | static inline bool blk_queue_zone_is_seq(struct request_queue *q, |
686 | sector_t sector) |
687 | { |
688 | if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap) |
689 | return false; |
690 | return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap); |
691 | } |
692 | #else /* CONFIG_BLK_DEV_ZONED */ |
693 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
694 | { |
695 | return 0; |
696 | } |
697 | #endif /* CONFIG_BLK_DEV_ZONED */ |
698 | |
699 | static inline bool rq_is_sync(struct request *rq) |
700 | { |
701 | return op_is_sync(rq->cmd_flags); |
702 | } |
703 | |
704 | static inline bool rq_mergeable(struct request *rq) |
705 | { |
706 | if (blk_rq_is_passthrough(rq)) |
707 | return false; |
708 | |
709 | if (req_op(rq) == REQ_OP_FLUSH) |
710 | return false; |
711 | |
712 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
713 | return false; |
714 | |
715 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
716 | return false; |
717 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) |
718 | return false; |
719 | |
720 | return true; |
721 | } |
722 | |
723 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
724 | { |
725 | if (bio_page(a) == bio_page(b) && |
726 | bio_offset(a) == bio_offset(b)) |
727 | return true; |
728 | |
729 | return false; |
730 | } |
731 | |
732 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
733 | { |
734 | if (q->queue_depth) |
735 | return q->queue_depth; |
736 | |
737 | return q->nr_requests; |
738 | } |
739 | |
740 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
741 | |
742 | /* |
743 | * standard bounce addresses: |
744 | * |
745 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
746 | * BLK_BOUNCE_ANY : don't bounce anything |
747 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
748 | */ |
749 | |
750 | #if BITS_PER_LONG == 32 |
751 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
752 | #else |
753 | #define BLK_BOUNCE_HIGH -1ULL |
754 | #endif |
755 | #define BLK_BOUNCE_ANY (-1ULL) |
756 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
757 | |
758 | /* |
759 | * default timeout for SG_IO if none specified |
760 | */ |
761 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
762 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
763 | |
764 | struct rq_map_data { |
765 | struct page **pages; |
766 | int page_order; |
767 | int nr_entries; |
768 | unsigned long offset; |
769 | int null_mapped; |
770 | int from_user; |
771 | }; |
772 | |
773 | struct req_iterator { |
774 | struct bvec_iter iter; |
775 | struct bio *bio; |
776 | }; |
777 | |
778 | /* This should not be used directly - use rq_for_each_segment */ |
779 | #define for_each_bio(_bio) \ |
780 | for (; _bio; _bio = _bio->bi_next) |
781 | #define __rq_for_each_bio(_bio, rq) \ |
782 | if ((rq->bio)) \ |
783 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
784 | |
785 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
786 | __rq_for_each_bio(_iter.bio, _rq) \ |
787 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
788 | |
789 | #define rq_for_each_bvec(bvl, _rq, _iter) \ |
790 | __rq_for_each_bio(_iter.bio, _rq) \ |
791 | bio_for_each_bvec(bvl, _iter.bio, _iter.iter) |
792 | |
793 | #define rq_iter_last(bvec, _iter) \ |
794 | (_iter.bio->bi_next == NULL && \ |
795 | bio_iter_last(bvec, _iter.iter)) |
796 | |
797 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
798 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
799 | #endif |
800 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
801 | extern void rq_flush_dcache_pages(struct request *rq); |
802 | #else |
803 | static inline void rq_flush_dcache_pages(struct request *rq) |
804 | { |
805 | } |
806 | #endif |
807 | |
808 | extern int blk_register_queue(struct gendisk *disk); |
809 | extern void blk_unregister_queue(struct gendisk *disk); |
810 | extern blk_qc_t generic_make_request(struct bio *bio); |
811 | extern blk_qc_t direct_make_request(struct bio *bio); |
812 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
813 | extern void blk_init_request_from_bio(struct request *req, struct bio *bio); |
814 | extern void blk_put_request(struct request *); |
815 | extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
816 | blk_mq_req_flags_t flags); |
817 | extern int blk_lld_busy(struct request_queue *q); |
818 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
819 | struct bio_set *bs, gfp_t gfp_mask, |
820 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
821 | void *data); |
822 | extern void blk_rq_unprep_clone(struct request *rq); |
823 | extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
824 | struct request *rq); |
825 | extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
826 | extern void blk_queue_split(struct request_queue *, struct bio **); |
827 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
828 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
829 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
830 | unsigned int, void __user *); |
831 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
832 | unsigned int, void __user *); |
833 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
834 | struct scsi_ioctl_command __user *); |
835 | |
836 | extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
837 | extern void blk_queue_exit(struct request_queue *q); |
838 | extern void blk_sync_queue(struct request_queue *q); |
839 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
840 | struct rq_map_data *, void __user *, unsigned long, |
841 | gfp_t); |
842 | extern int blk_rq_unmap_user(struct bio *); |
843 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
844 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
845 | struct rq_map_data *, const struct iov_iter *, |
846 | gfp_t); |
847 | extern void blk_execute_rq(struct request_queue *, struct gendisk *, |
848 | struct request *, int); |
849 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
850 | struct request *, int, rq_end_io_fn *); |
851 | |
852 | int blk_status_to_errno(blk_status_t status); |
853 | blk_status_t errno_to_blk_status(int errno); |
854 | |
855 | int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); |
856 | |
857 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
858 | { |
859 | return bdev->bd_disk->queue; /* this is never NULL */ |
860 | } |
861 | |
862 | /* |
863 | * The basic unit of block I/O is a sector. It is used in a number of contexts |
864 | * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 |
865 | * bytes. Variables of type sector_t represent an offset or size that is a |
866 | * multiple of 512 bytes. Hence these two constants. |
867 | */ |
868 | #ifndef SECTOR_SHIFT |
869 | #define SECTOR_SHIFT 9 |
870 | #endif |
871 | #ifndef SECTOR_SIZE |
872 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
873 | #endif |
874 | |
875 | /* |
876 | * blk_rq_pos() : the current sector |
877 | * blk_rq_bytes() : bytes left in the entire request |
878 | * blk_rq_cur_bytes() : bytes left in the current segment |
879 | * blk_rq_err_bytes() : bytes left till the next error boundary |
880 | * blk_rq_sectors() : sectors left in the entire request |
881 | * blk_rq_cur_sectors() : sectors left in the current segment |
882 | */ |
883 | static inline sector_t blk_rq_pos(const struct request *rq) |
884 | { |
885 | return rq->__sector; |
886 | } |
887 | |
888 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
889 | { |
890 | return rq->__data_len; |
891 | } |
892 | |
893 | static inline int blk_rq_cur_bytes(const struct request *rq) |
894 | { |
895 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
896 | } |
897 | |
898 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
899 | |
900 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
901 | { |
902 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
903 | } |
904 | |
905 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
906 | { |
907 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
908 | } |
909 | |
910 | #ifdef CONFIG_BLK_DEV_ZONED |
911 | static inline unsigned int blk_rq_zone_no(struct request *rq) |
912 | { |
913 | return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); |
914 | } |
915 | |
916 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) |
917 | { |
918 | return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); |
919 | } |
920 | #endif /* CONFIG_BLK_DEV_ZONED */ |
921 | |
922 | /* |
923 | * Some commands like WRITE SAME have a payload or data transfer size which |
924 | * is different from the size of the request. Any driver that supports such |
925 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to |
926 | * calculate the data transfer size. |
927 | */ |
928 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) |
929 | { |
930 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
931 | return rq->special_vec.bv_len; |
932 | return blk_rq_bytes(rq); |
933 | } |
934 | |
935 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
936 | int op) |
937 | { |
938 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
939 | return min(q->limits.max_discard_sectors, |
940 | UINT_MAX >> SECTOR_SHIFT); |
941 | |
942 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
943 | return q->limits.max_write_same_sectors; |
944 | |
945 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
946 | return q->limits.max_write_zeroes_sectors; |
947 | |
948 | return q->limits.max_sectors; |
949 | } |
950 | |
951 | /* |
952 | * Return maximum size of a request at given offset. Only valid for |
953 | * file system requests. |
954 | */ |
955 | static inline unsigned int blk_max_size_offset(struct request_queue *q, |
956 | sector_t offset) |
957 | { |
958 | if (!q->limits.chunk_sectors) |
959 | return q->limits.max_sectors; |
960 | |
961 | return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - |
962 | (offset & (q->limits.chunk_sectors - 1)))); |
963 | } |
964 | |
965 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
966 | sector_t offset) |
967 | { |
968 | struct request_queue *q = rq->q; |
969 | |
970 | if (blk_rq_is_passthrough(rq)) |
971 | return q->limits.max_hw_sectors; |
972 | |
973 | if (!q->limits.chunk_sectors || |
974 | req_op(rq) == REQ_OP_DISCARD || |
975 | req_op(rq) == REQ_OP_SECURE_ERASE) |
976 | return blk_queue_get_max_sectors(q, req_op(rq)); |
977 | |
978 | return min(blk_max_size_offset(q, offset), |
979 | blk_queue_get_max_sectors(q, req_op(rq))); |
980 | } |
981 | |
982 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
983 | { |
984 | unsigned int nr_bios = 0; |
985 | struct bio *bio; |
986 | |
987 | __rq_for_each_bio(bio, rq) |
988 | nr_bios++; |
989 | |
990 | return nr_bios; |
991 | } |
992 | |
993 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
994 | |
995 | /* |
996 | * Request completion related functions. |
997 | * |
998 | * blk_update_request() completes given number of bytes and updates |
999 | * the request without completing it. |
1000 | * |
1001 | * blk_end_request() and friends. __blk_end_request() must be called |
1002 | * with the request queue spinlock acquired. |
1003 | * |
1004 | * Several drivers define their own end_request and call |
1005 | * blk_end_request() for parts of the original function. |
1006 | * This prevents code duplication in drivers. |
1007 | */ |
1008 | extern bool blk_update_request(struct request *rq, blk_status_t error, |
1009 | unsigned int nr_bytes); |
1010 | extern void blk_end_request_all(struct request *rq, blk_status_t error); |
1011 | extern bool __blk_end_request(struct request *rq, blk_status_t error, |
1012 | unsigned int nr_bytes); |
1013 | extern void __blk_end_request_all(struct request *rq, blk_status_t error); |
1014 | extern bool __blk_end_request_cur(struct request *rq, blk_status_t error); |
1015 | |
1016 | extern void __blk_complete_request(struct request *); |
1017 | extern void blk_abort_request(struct request *); |
1018 | |
1019 | /* |
1020 | * Access functions for manipulating queue properties |
1021 | */ |
1022 | extern void blk_cleanup_queue(struct request_queue *); |
1023 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
1024 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
1025 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
1026 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
1027 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
1028 | extern void blk_queue_max_discard_segments(struct request_queue *, |
1029 | unsigned short); |
1030 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
1031 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1032 | unsigned int max_discard_sectors); |
1033 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1034 | unsigned int max_write_same_sectors); |
1035 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1036 | unsigned int max_write_same_sectors); |
1037 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
1038 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
1039 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1040 | unsigned int alignment); |
1041 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
1042 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
1043 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
1044 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
1045 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
1046 | extern void blk_set_default_limits(struct queue_limits *lim); |
1047 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
1048 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1049 | sector_t offset); |
1050 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1051 | sector_t offset); |
1052 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1053 | sector_t offset); |
1054 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
1055 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
1056 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
1057 | extern int blk_queue_dma_drain(struct request_queue *q, |
1058 | dma_drain_needed_fn *dma_drain_needed, |
1059 | void *buf, unsigned int size); |
1060 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
1061 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
1062 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
1063 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
1064 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
1065 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1066 | |
1067 | /* |
1068 | * Number of physical segments as sent to the device. |
1069 | * |
1070 | * Normally this is the number of discontiguous data segments sent by the |
1071 | * submitter. But for data-less command like discard we might have no |
1072 | * actual data segments submitted, but the driver might have to add it's |
1073 | * own special payload. In that case we still return 1 here so that this |
1074 | * special payload will be mapped. |
1075 | */ |
1076 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1077 | { |
1078 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
1079 | return 1; |
1080 | return rq->nr_phys_segments; |
1081 | } |
1082 | |
1083 | /* |
1084 | * Number of discard segments (or ranges) the driver needs to fill in. |
1085 | * Each discard bio merged into a request is counted as one segment. |
1086 | */ |
1087 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) |
1088 | { |
1089 | return max_t(unsigned short, rq->nr_phys_segments, 1); |
1090 | } |
1091 | |
1092 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1093 | extern void blk_dump_rq_flags(struct request *, char *); |
1094 | extern long nr_blockdev_pages(void); |
1095 | |
1096 | bool __must_check blk_get_queue(struct request_queue *); |
1097 | struct request_queue *blk_alloc_queue(gfp_t); |
1098 | struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id); |
1099 | extern void blk_put_queue(struct request_queue *); |
1100 | extern void blk_set_queue_dying(struct request_queue *); |
1101 | |
1102 | /* |
1103 | * blk_plug permits building a queue of related requests by holding the I/O |
1104 | * fragments for a short period. This allows merging of sequential requests |
1105 | * into single larger request. As the requests are moved from a per-task list to |
1106 | * the device's request_queue in a batch, this results in improved scalability |
1107 | * as the lock contention for request_queue lock is reduced. |
1108 | * |
1109 | * It is ok not to disable preemption when adding the request to the plug list |
1110 | * or when attempting a merge, because blk_schedule_flush_list() will only flush |
1111 | * the plug list when the task sleeps by itself. For details, please see |
1112 | * schedule() where blk_schedule_flush_plug() is called. |
1113 | */ |
1114 | struct blk_plug { |
1115 | struct list_head mq_list; /* blk-mq requests */ |
1116 | struct list_head cb_list; /* md requires an unplug callback */ |
1117 | unsigned short rq_count; |
1118 | bool multiple_queues; |
1119 | }; |
1120 | #define BLK_MAX_REQUEST_COUNT 16 |
1121 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
1122 | |
1123 | struct blk_plug_cb; |
1124 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
1125 | struct blk_plug_cb { |
1126 | struct list_head list; |
1127 | blk_plug_cb_fn callback; |
1128 | void *data; |
1129 | }; |
1130 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1131 | void *data, int size); |
1132 | extern void blk_start_plug(struct blk_plug *); |
1133 | extern void blk_finish_plug(struct blk_plug *); |
1134 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
1135 | |
1136 | static inline void blk_flush_plug(struct task_struct *tsk) |
1137 | { |
1138 | struct blk_plug *plug = tsk->plug; |
1139 | |
1140 | if (plug) |
1141 | blk_flush_plug_list(plug, false); |
1142 | } |
1143 | |
1144 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
1145 | { |
1146 | struct blk_plug *plug = tsk->plug; |
1147 | |
1148 | if (plug) |
1149 | blk_flush_plug_list(plug, true); |
1150 | } |
1151 | |
1152 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1153 | { |
1154 | struct blk_plug *plug = tsk->plug; |
1155 | |
1156 | return plug && |
1157 | (!list_empty(&plug->mq_list) || |
1158 | !list_empty(&plug->cb_list)); |
1159 | } |
1160 | |
1161 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
1162 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1163 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
1164 | |
1165 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ |
1166 | |
1167 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1168 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
1169 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1170 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
1171 | struct bio **biop); |
1172 | |
1173 | #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ |
1174 | #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
1175 | |
1176 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1177 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, |
1178 | unsigned flags); |
1179 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1180 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
1181 | |
1182 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1183 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
1184 | { |
1185 | return blkdev_issue_discard(sb->s_bdev, |
1186 | block << (sb->s_blocksize_bits - |
1187 | SECTOR_SHIFT), |
1188 | nr_blocks << (sb->s_blocksize_bits - |
1189 | SECTOR_SHIFT), |
1190 | gfp_mask, flags); |
1191 | } |
1192 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
1193 | sector_t nr_blocks, gfp_t gfp_mask) |
1194 | { |
1195 | return blkdev_issue_zeroout(sb->s_bdev, |
1196 | block << (sb->s_blocksize_bits - |
1197 | SECTOR_SHIFT), |
1198 | nr_blocks << (sb->s_blocksize_bits - |
1199 | SECTOR_SHIFT), |
1200 | gfp_mask, 0); |
1201 | } |
1202 | |
1203 | extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
1204 | |
1205 | enum blk_default_limits { |
1206 | BLK_MAX_SEGMENTS = 128, |
1207 | BLK_SAFE_MAX_SECTORS = 255, |
1208 | BLK_DEF_MAX_SECTORS = 2560, |
1209 | BLK_MAX_SEGMENT_SIZE = 65536, |
1210 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
1211 | }; |
1212 | |
1213 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
1214 | { |
1215 | return q->limits.seg_boundary_mask; |
1216 | } |
1217 | |
1218 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1219 | { |
1220 | return q->limits.virt_boundary_mask; |
1221 | } |
1222 | |
1223 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1224 | { |
1225 | return q->limits.max_sectors; |
1226 | } |
1227 | |
1228 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
1229 | { |
1230 | return q->limits.max_hw_sectors; |
1231 | } |
1232 | |
1233 | static inline unsigned short queue_max_segments(struct request_queue *q) |
1234 | { |
1235 | return q->limits.max_segments; |
1236 | } |
1237 | |
1238 | static inline unsigned short queue_max_discard_segments(struct request_queue *q) |
1239 | { |
1240 | return q->limits.max_discard_segments; |
1241 | } |
1242 | |
1243 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
1244 | { |
1245 | return q->limits.max_segment_size; |
1246 | } |
1247 | |
1248 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1249 | { |
1250 | int retval = 512; |
1251 | |
1252 | if (q && q->limits.logical_block_size) |
1253 | retval = q->limits.logical_block_size; |
1254 | |
1255 | return retval; |
1256 | } |
1257 | |
1258 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1259 | { |
1260 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1261 | } |
1262 | |
1263 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1264 | { |
1265 | return q->limits.physical_block_size; |
1266 | } |
1267 | |
1268 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
1269 | { |
1270 | return queue_physical_block_size(bdev_get_queue(bdev)); |
1271 | } |
1272 | |
1273 | static inline unsigned int queue_io_min(struct request_queue *q) |
1274 | { |
1275 | return q->limits.io_min; |
1276 | } |
1277 | |
1278 | static inline int bdev_io_min(struct block_device *bdev) |
1279 | { |
1280 | return queue_io_min(bdev_get_queue(bdev)); |
1281 | } |
1282 | |
1283 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1284 | { |
1285 | return q->limits.io_opt; |
1286 | } |
1287 | |
1288 | static inline int bdev_io_opt(struct block_device *bdev) |
1289 | { |
1290 | return queue_io_opt(bdev_get_queue(bdev)); |
1291 | } |
1292 | |
1293 | static inline int queue_alignment_offset(struct request_queue *q) |
1294 | { |
1295 | if (q->limits.misaligned) |
1296 | return -1; |
1297 | |
1298 | return q->limits.alignment_offset; |
1299 | } |
1300 | |
1301 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
1302 | { |
1303 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
1304 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
1305 | << SECTOR_SHIFT; |
1306 | |
1307 | return (granularity + lim->alignment_offset - alignment) % granularity; |
1308 | } |
1309 | |
1310 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1311 | { |
1312 | struct request_queue *q = bdev_get_queue(bdev); |
1313 | |
1314 | if (q->limits.misaligned) |
1315 | return -1; |
1316 | |
1317 | if (bdev != bdev->bd_contains) |
1318 | return bdev->bd_part->alignment_offset; |
1319 | |
1320 | return q->limits.alignment_offset; |
1321 | } |
1322 | |
1323 | static inline int queue_discard_alignment(struct request_queue *q) |
1324 | { |
1325 | if (q->limits.discard_misaligned) |
1326 | return -1; |
1327 | |
1328 | return q->limits.discard_alignment; |
1329 | } |
1330 | |
1331 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
1332 | { |
1333 | unsigned int alignment, granularity, offset; |
1334 | |
1335 | if (!lim->max_discard_sectors) |
1336 | return 0; |
1337 | |
1338 | /* Why are these in bytes, not sectors? */ |
1339 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
1340 | granularity = lim->discard_granularity >> SECTOR_SHIFT; |
1341 | if (!granularity) |
1342 | return 0; |
1343 | |
1344 | /* Offset of the partition start in 'granularity' sectors */ |
1345 | offset = sector_div(sector, granularity); |
1346 | |
1347 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
1348 | offset = (granularity + alignment - offset) % granularity; |
1349 | |
1350 | /* Turn it back into bytes, gaah */ |
1351 | return offset << SECTOR_SHIFT; |
1352 | } |
1353 | |
1354 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1355 | { |
1356 | struct request_queue *q = bdev_get_queue(bdev); |
1357 | |
1358 | if (bdev != bdev->bd_contains) |
1359 | return bdev->bd_part->discard_alignment; |
1360 | |
1361 | return q->limits.discard_alignment; |
1362 | } |
1363 | |
1364 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1365 | { |
1366 | struct request_queue *q = bdev_get_queue(bdev); |
1367 | |
1368 | if (q) |
1369 | return q->limits.max_write_same_sectors; |
1370 | |
1371 | return 0; |
1372 | } |
1373 | |
1374 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1375 | { |
1376 | struct request_queue *q = bdev_get_queue(bdev); |
1377 | |
1378 | if (q) |
1379 | return q->limits.max_write_zeroes_sectors; |
1380 | |
1381 | return 0; |
1382 | } |
1383 | |
1384 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1385 | { |
1386 | struct request_queue *q = bdev_get_queue(bdev); |
1387 | |
1388 | if (q) |
1389 | return blk_queue_zoned_model(q); |
1390 | |
1391 | return BLK_ZONED_NONE; |
1392 | } |
1393 | |
1394 | static inline bool bdev_is_zoned(struct block_device *bdev) |
1395 | { |
1396 | struct request_queue *q = bdev_get_queue(bdev); |
1397 | |
1398 | if (q) |
1399 | return blk_queue_is_zoned(q); |
1400 | |
1401 | return false; |
1402 | } |
1403 | |
1404 | static inline unsigned int bdev_zone_sectors(struct block_device *bdev) |
1405 | { |
1406 | struct request_queue *q = bdev_get_queue(bdev); |
1407 | |
1408 | if (q) |
1409 | return blk_queue_zone_sectors(q); |
1410 | return 0; |
1411 | } |
1412 | |
1413 | static inline int queue_dma_alignment(struct request_queue *q) |
1414 | { |
1415 | return q ? q->dma_alignment : 511; |
1416 | } |
1417 | |
1418 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
1419 | unsigned int len) |
1420 | { |
1421 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
1422 | return !(addr & alignment) && !(len & alignment); |
1423 | } |
1424 | |
1425 | /* assumes size > 256 */ |
1426 | static inline unsigned int blksize_bits(unsigned int size) |
1427 | { |
1428 | unsigned int bits = 8; |
1429 | do { |
1430 | bits++; |
1431 | size >>= 1; |
1432 | } while (size > 256); |
1433 | return bits; |
1434 | } |
1435 | |
1436 | static inline unsigned int block_size(struct block_device *bdev) |
1437 | { |
1438 | return bdev->bd_block_size; |
1439 | } |
1440 | |
1441 | typedef struct {struct page *v;} Sector; |
1442 | |
1443 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
1444 | |
1445 | static inline void put_dev_sector(Sector p) |
1446 | { |
1447 | put_page(p.v); |
1448 | } |
1449 | |
1450 | int kblockd_schedule_work(struct work_struct *work); |
1451 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
1452 | int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1453 | |
1454 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1455 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
1456 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
1457 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
1458 | |
1459 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1460 | |
1461 | enum blk_integrity_flags { |
1462 | BLK_INTEGRITY_VERIFY = 1 << 0, |
1463 | BLK_INTEGRITY_GENERATE = 1 << 1, |
1464 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
1465 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
1466 | }; |
1467 | |
1468 | struct blk_integrity_iter { |
1469 | void *prot_buf; |
1470 | void *data_buf; |
1471 | sector_t seed; |
1472 | unsigned int data_size; |
1473 | unsigned short interval; |
1474 | const char *disk_name; |
1475 | }; |
1476 | |
1477 | typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
1478 | |
1479 | struct blk_integrity_profile { |
1480 | integrity_processing_fn *generate_fn; |
1481 | integrity_processing_fn *verify_fn; |
1482 | const char *name; |
1483 | }; |
1484 | |
1485 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1486 | extern void blk_integrity_unregister(struct gendisk *); |
1487 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
1488 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1489 | struct scatterlist *); |
1490 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
1491 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1492 | struct request *); |
1493 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, |
1494 | struct bio *); |
1495 | |
1496 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1497 | { |
1498 | struct blk_integrity *bi = &disk->queue->integrity; |
1499 | |
1500 | if (!bi->profile) |
1501 | return NULL; |
1502 | |
1503 | return bi; |
1504 | } |
1505 | |
1506 | static inline |
1507 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
1508 | { |
1509 | return blk_get_integrity(bdev->bd_disk); |
1510 | } |
1511 | |
1512 | static inline bool blk_integrity_rq(struct request *rq) |
1513 | { |
1514 | return rq->cmd_flags & REQ_INTEGRITY; |
1515 | } |
1516 | |
1517 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1518 | unsigned int segs) |
1519 | { |
1520 | q->limits.max_integrity_segments = segs; |
1521 | } |
1522 | |
1523 | static inline unsigned short |
1524 | queue_max_integrity_segments(struct request_queue *q) |
1525 | { |
1526 | return q->limits.max_integrity_segments; |
1527 | } |
1528 | |
1529 | /** |
1530 | * bio_integrity_intervals - Return number of integrity intervals for a bio |
1531 | * @bi: blk_integrity profile for device |
1532 | * @sectors: Size of the bio in 512-byte sectors |
1533 | * |
1534 | * Description: The block layer calculates everything in 512 byte |
1535 | * sectors but integrity metadata is done in terms of the data integrity |
1536 | * interval size of the storage device. Convert the block layer sectors |
1537 | * to the appropriate number of integrity intervals. |
1538 | */ |
1539 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
1540 | unsigned int sectors) |
1541 | { |
1542 | return sectors >> (bi->interval_exp - 9); |
1543 | } |
1544 | |
1545 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
1546 | unsigned int sectors) |
1547 | { |
1548 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
1549 | } |
1550 | |
1551 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1552 | |
1553 | struct bio; |
1554 | struct block_device; |
1555 | struct gendisk; |
1556 | struct blk_integrity; |
1557 | |
1558 | static inline int blk_integrity_rq(struct request *rq) |
1559 | { |
1560 | return 0; |
1561 | } |
1562 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
1563 | struct bio *b) |
1564 | { |
1565 | return 0; |
1566 | } |
1567 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
1568 | struct bio *b, |
1569 | struct scatterlist *s) |
1570 | { |
1571 | return 0; |
1572 | } |
1573 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
1574 | { |
1575 | return NULL; |
1576 | } |
1577 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1578 | { |
1579 | return NULL; |
1580 | } |
1581 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
1582 | { |
1583 | return 0; |
1584 | } |
1585 | static inline void blk_integrity_register(struct gendisk *d, |
1586 | struct blk_integrity *b) |
1587 | { |
1588 | } |
1589 | static inline void blk_integrity_unregister(struct gendisk *d) |
1590 | { |
1591 | } |
1592 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1593 | unsigned int segs) |
1594 | { |
1595 | } |
1596 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) |
1597 | { |
1598 | return 0; |
1599 | } |
1600 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1601 | struct request *r1, |
1602 | struct request *r2) |
1603 | { |
1604 | return true; |
1605 | } |
1606 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1607 | struct request *r, |
1608 | struct bio *b) |
1609 | { |
1610 | return true; |
1611 | } |
1612 | |
1613 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
1614 | unsigned int sectors) |
1615 | { |
1616 | return 0; |
1617 | } |
1618 | |
1619 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
1620 | unsigned int sectors) |
1621 | { |
1622 | return 0; |
1623 | } |
1624 | |
1625 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1626 | |
1627 | struct block_device_operations { |
1628 | int (*open) (struct block_device *, fmode_t); |
1629 | void (*release) (struct gendisk *, fmode_t); |
1630 | int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); |
1631 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1632 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1633 | unsigned int (*check_events) (struct gendisk *disk, |
1634 | unsigned int clearing); |
1635 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ |
1636 | int (*media_changed) (struct gendisk *); |
1637 | void (*unlock_native_capacity) (struct gendisk *); |
1638 | int (*revalidate_disk) (struct gendisk *); |
1639 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
1640 | /* this callback is with swap_lock and sometimes page table lock held */ |
1641 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
1642 | int (*report_zones)(struct gendisk *, sector_t sector, |
1643 | struct blk_zone *zones, unsigned int *nr_zones, |
1644 | gfp_t gfp_mask); |
1645 | struct module *owner; |
1646 | const struct pr_ops *pr_ops; |
1647 | }; |
1648 | |
1649 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1650 | unsigned long); |
1651 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1652 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, |
1653 | struct writeback_control *); |
1654 | |
1655 | #ifdef CONFIG_BLK_DEV_ZONED |
1656 | bool blk_req_needs_zone_write_lock(struct request *rq); |
1657 | void __blk_req_zone_write_lock(struct request *rq); |
1658 | void __blk_req_zone_write_unlock(struct request *rq); |
1659 | |
1660 | static inline void blk_req_zone_write_lock(struct request *rq) |
1661 | { |
1662 | if (blk_req_needs_zone_write_lock(rq)) |
1663 | __blk_req_zone_write_lock(rq); |
1664 | } |
1665 | |
1666 | static inline void blk_req_zone_write_unlock(struct request *rq) |
1667 | { |
1668 | if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) |
1669 | __blk_req_zone_write_unlock(rq); |
1670 | } |
1671 | |
1672 | static inline bool blk_req_zone_is_write_locked(struct request *rq) |
1673 | { |
1674 | return rq->q->seq_zones_wlock && |
1675 | test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); |
1676 | } |
1677 | |
1678 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) |
1679 | { |
1680 | if (!blk_req_needs_zone_write_lock(rq)) |
1681 | return true; |
1682 | return !blk_req_zone_is_write_locked(rq); |
1683 | } |
1684 | #else |
1685 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) |
1686 | { |
1687 | return false; |
1688 | } |
1689 | |
1690 | static inline void blk_req_zone_write_lock(struct request *rq) |
1691 | { |
1692 | } |
1693 | |
1694 | static inline void blk_req_zone_write_unlock(struct request *rq) |
1695 | { |
1696 | } |
1697 | static inline bool blk_req_zone_is_write_locked(struct request *rq) |
1698 | { |
1699 | return false; |
1700 | } |
1701 | |
1702 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) |
1703 | { |
1704 | return true; |
1705 | } |
1706 | #endif /* CONFIG_BLK_DEV_ZONED */ |
1707 | |
1708 | #else /* CONFIG_BLOCK */ |
1709 | |
1710 | struct block_device; |
1711 | |
1712 | /* |
1713 | * stubs for when the block layer is configured out |
1714 | */ |
1715 | #define buffer_heads_over_limit 0 |
1716 | |
1717 | static inline long nr_blockdev_pages(void) |
1718 | { |
1719 | return 0; |
1720 | } |
1721 | |
1722 | struct blk_plug { |
1723 | }; |
1724 | |
1725 | static inline void blk_start_plug(struct blk_plug *plug) |
1726 | { |
1727 | } |
1728 | |
1729 | static inline void blk_finish_plug(struct blk_plug *plug) |
1730 | { |
1731 | } |
1732 | |
1733 | static inline void blk_flush_plug(struct task_struct *task) |
1734 | { |
1735 | } |
1736 | |
1737 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1738 | { |
1739 | } |
1740 | |
1741 | |
1742 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1743 | { |
1744 | return false; |
1745 | } |
1746 | |
1747 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1748 | sector_t *error_sector) |
1749 | { |
1750 | return 0; |
1751 | } |
1752 | |
1753 | #endif /* CONFIG_BLOCK */ |
1754 | |
1755 | static inline void blk_wake_io_task(struct task_struct *waiter) |
1756 | { |
1757 | /* |
1758 | * If we're polling, the task itself is doing the completions. For |
1759 | * that case, we don't need to signal a wakeup, it's enough to just |
1760 | * mark us as RUNNING. |
1761 | */ |
1762 | if (waiter == current) |
1763 | __set_current_state(TASK_RUNNING); |
1764 | else |
1765 | wake_up_process(waiter); |
1766 | } |
1767 | |
1768 | #endif |
1769 | |