Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : /*
3 : * Portions Copyright (C) 1992 Drew Eckhardt
4 : */
5 : #ifndef _LINUX_BLKDEV_H
6 : #define _LINUX_BLKDEV_H
7 :
8 : #include <linux/types.h>
9 : #include <linux/blk_types.h>
10 : #include <linux/device.h>
11 : #include <linux/list.h>
12 : #include <linux/llist.h>
13 : #include <linux/minmax.h>
14 : #include <linux/timer.h>
15 : #include <linux/workqueue.h>
16 : #include <linux/wait.h>
17 : #include <linux/bio.h>
18 : #include <linux/gfp.h>
19 : #include <linux/kdev_t.h>
20 : #include <linux/rcupdate.h>
21 : #include <linux/percpu-refcount.h>
22 : #include <linux/blkzoned.h>
23 : #include <linux/sched.h>
24 : #include <linux/sbitmap.h>
25 : #include <linux/uuid.h>
26 : #include <linux/xarray.h>
27 :
28 : struct module;
29 : struct request_queue;
30 : struct elevator_queue;
31 : struct blk_trace;
32 : struct request;
33 : struct sg_io_hdr;
34 : struct blkcg_gq;
35 : struct blk_flush_queue;
36 : struct kiocb;
37 : struct pr_ops;
38 : struct rq_qos;
39 : struct blk_queue_stats;
40 : struct blk_stat_callback;
41 : struct blk_crypto_profile;
42 :
43 : extern const struct device_type disk_type;
44 : extern struct device_type part_type;
45 : extern struct class block_class;
46 :
47 : /*
48 : * Maximum number of blkcg policies allowed to be registered concurrently.
49 : * Defined here to simplify include dependency.
50 : */
51 : #define BLKCG_MAX_POLS 6
52 :
53 : #define DISK_MAX_PARTS 256
54 : #define DISK_NAME_LEN 32
55 :
56 : #define PARTITION_META_INFO_VOLNAMELTH 64
57 : /*
58 : * Enough for the string representation of any kind of UUID plus NULL.
59 : * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
60 : */
61 : #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
62 :
63 : struct partition_meta_info {
64 : char uuid[PARTITION_META_INFO_UUIDLTH];
65 : u8 volname[PARTITION_META_INFO_VOLNAMELTH];
66 : };
67 :
68 : /**
69 : * DOC: genhd capability flags
70 : *
71 : * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
72 : * removable media. When set, the device remains present even when media is not
73 : * inserted. Shall not be set for devices which are removed entirely when the
74 : * media is removed.
75 : *
76 : * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
77 : * doesn't appear in sysfs, and can't be opened from userspace or using
78 : * blkdev_get*. Used for the underlying components of multipath devices.
79 : *
80 : * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
81 : * scan for partitions from add_disk, and users can't add partitions manually.
82 : *
83 : */
84 : enum {
85 : GENHD_FL_REMOVABLE = 1 << 0,
86 : GENHD_FL_HIDDEN = 1 << 1,
87 : GENHD_FL_NO_PART = 1 << 2,
88 : };
89 :
90 : enum {
91 : DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
92 : DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
93 : };
94 :
95 : enum {
96 : /* Poll even if events_poll_msecs is unset */
97 : DISK_EVENT_FLAG_POLL = 1 << 0,
98 : /* Forward events to udev */
99 : DISK_EVENT_FLAG_UEVENT = 1 << 1,
100 : /* Block event polling when open for exclusive write */
101 : DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
102 : };
103 :
104 : struct disk_events;
105 : struct badblocks;
106 :
107 : struct blk_integrity {
108 : const struct blk_integrity_profile *profile;
109 : unsigned char flags;
110 : unsigned char tuple_size;
111 : unsigned char interval_exp;
112 : unsigned char tag_size;
113 : };
114 :
115 : struct gendisk {
116 : /*
117 : * major/first_minor/minors should not be set by any new driver, the
118 : * block core will take care of allocating them automatically.
119 : */
120 : int major;
121 : int first_minor;
122 : int minors;
123 :
124 : char disk_name[DISK_NAME_LEN]; /* name of major driver */
125 :
126 : unsigned short events; /* supported events */
127 : unsigned short event_flags; /* flags related to event processing */
128 :
129 : struct xarray part_tbl;
130 : struct block_device *part0;
131 :
132 : const struct block_device_operations *fops;
133 : struct request_queue *queue;
134 : void *private_data;
135 :
136 : struct bio_set bio_split;
137 :
138 : int flags;
139 : unsigned long state;
140 : #define GD_NEED_PART_SCAN 0
141 : #define GD_READ_ONLY 1
142 : #define GD_DEAD 2
143 : #define GD_NATIVE_CAPACITY 3
144 : #define GD_ADDED 4
145 : #define GD_SUPPRESS_PART_SCAN 5
146 : #define GD_OWNS_QUEUE 6
147 :
148 : struct mutex open_mutex; /* open/close mutex */
149 : unsigned open_partitions; /* number of open partitions */
150 :
151 : struct backing_dev_info *bdi;
152 : struct kobject queue_kobj; /* the queue/ directory */
153 : struct kobject *slave_dir;
154 : #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
155 : struct list_head slave_bdevs;
156 : #endif
157 : struct timer_rand_state *random;
158 : atomic_t sync_io; /* RAID */
159 : struct disk_events *ev;
160 :
161 : #ifdef CONFIG_BLK_DEV_ZONED
162 : /*
163 : * Zoned block device information for request dispatch control.
164 : * nr_zones is the total number of zones of the device. This is always
165 : * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
166 : * bits which indicates if a zone is conventional (bit set) or
167 : * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
168 : * bits which indicates if a zone is write locked, that is, if a write
169 : * request targeting the zone was dispatched.
170 : *
171 : * Reads of this information must be protected with blk_queue_enter() /
172 : * blk_queue_exit(). Modifying this information is only allowed while
173 : * no requests are being processed. See also blk_mq_freeze_queue() and
174 : * blk_mq_unfreeze_queue().
175 : */
176 : unsigned int nr_zones;
177 : unsigned int max_open_zones;
178 : unsigned int max_active_zones;
179 : unsigned long *conv_zones_bitmap;
180 : unsigned long *seq_zones_wlock;
181 : #endif /* CONFIG_BLK_DEV_ZONED */
182 :
183 : #if IS_ENABLED(CONFIG_CDROM)
184 : struct cdrom_device_info *cdi;
185 : #endif
186 : int node_id;
187 : struct badblocks *bb;
188 : struct lockdep_map lockdep_map;
189 : u64 diskseq;
190 :
191 : /*
192 : * Independent sector access ranges. This is always NULL for
193 : * devices that do not have multiple independent access ranges.
194 : */
195 : struct blk_independent_access_ranges *ia_ranges;
196 : };
197 :
198 : static inline bool disk_live(struct gendisk *disk)
199 : {
200 0 : return !inode_unhashed(disk->part0->bd_inode);
201 : }
202 :
203 : /**
204 : * disk_openers - returns how many openers are there for a disk
205 : * @disk: disk to check
206 : *
207 : * This returns the number of openers for a disk. Note that this value is only
208 : * stable if disk->open_mutex is held.
209 : *
210 : * Note: Due to a quirk in the block layer open code, each open partition is
211 : * only counted once even if there are multiple openers.
212 : */
213 : static inline unsigned int disk_openers(struct gendisk *disk)
214 : {
215 : return atomic_read(&disk->part0->bd_openers);
216 : }
217 :
218 : /*
219 : * The gendisk is refcounted by the part0 block_device, and the bd_device
220 : * therein is also used for device model presentation in sysfs.
221 : */
222 : #define dev_to_disk(device) \
223 : (dev_to_bdev(device)->bd_disk)
224 : #define disk_to_dev(disk) \
225 : (&((disk)->part0->bd_device))
226 :
227 : #if IS_REACHABLE(CONFIG_CDROM)
228 : #define disk_to_cdi(disk) ((disk)->cdi)
229 : #else
230 : #define disk_to_cdi(disk) NULL
231 : #endif
232 :
233 : static inline dev_t disk_devt(struct gendisk *disk)
234 : {
235 0 : return MKDEV(disk->major, disk->first_minor);
236 : }
237 :
238 : static inline int blk_validate_block_size(unsigned long bsize)
239 : {
240 : if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
241 : return -EINVAL;
242 :
243 : return 0;
244 : }
245 :
246 : static inline bool blk_op_is_passthrough(blk_opf_t op)
247 : {
248 0 : op &= REQ_OP_MASK;
249 0 : return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
250 : }
251 :
252 : /*
253 : * Zoned block device models (zoned limit).
254 : *
255 : * Note: This needs to be ordered from the least to the most severe
256 : * restrictions for the inheritance in blk_stack_limits() to work.
257 : */
258 : enum blk_zoned_model {
259 : BLK_ZONED_NONE = 0, /* Regular block device */
260 : BLK_ZONED_HA, /* Host-aware zoned block device */
261 : BLK_ZONED_HM, /* Host-managed zoned block device */
262 : };
263 :
264 : /*
265 : * BLK_BOUNCE_NONE: never bounce (default)
266 : * BLK_BOUNCE_HIGH: bounce all highmem pages
267 : */
268 : enum blk_bounce {
269 : BLK_BOUNCE_NONE,
270 : BLK_BOUNCE_HIGH,
271 : };
272 :
273 : struct queue_limits {
274 : enum blk_bounce bounce;
275 : unsigned long seg_boundary_mask;
276 : unsigned long virt_boundary_mask;
277 :
278 : unsigned int max_hw_sectors;
279 : unsigned int max_dev_sectors;
280 : unsigned int chunk_sectors;
281 : unsigned int max_sectors;
282 : unsigned int max_user_sectors;
283 : unsigned int max_segment_size;
284 : unsigned int physical_block_size;
285 : unsigned int logical_block_size;
286 : unsigned int alignment_offset;
287 : unsigned int io_min;
288 : unsigned int io_opt;
289 : unsigned int max_discard_sectors;
290 : unsigned int max_hw_discard_sectors;
291 : unsigned int max_secure_erase_sectors;
292 : unsigned int max_write_zeroes_sectors;
293 : unsigned int max_zone_append_sectors;
294 : unsigned int discard_granularity;
295 : unsigned int discard_alignment;
296 : unsigned int zone_write_granularity;
297 :
298 : unsigned short max_segments;
299 : unsigned short max_integrity_segments;
300 : unsigned short max_discard_segments;
301 :
302 : unsigned char misaligned;
303 : unsigned char discard_misaligned;
304 : unsigned char raid_partial_stripes_expensive;
305 : enum blk_zoned_model zoned;
306 :
307 : /*
308 : * Drivers that set dma_alignment to less than 511 must be prepared to
309 : * handle individual bvec's that are not a multiple of a SECTOR_SIZE
310 : * due to possible offsets.
311 : */
312 : unsigned int dma_alignment;
313 : };
314 :
315 : typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
316 : void *data);
317 :
318 : void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
319 :
320 : #ifdef CONFIG_BLK_DEV_ZONED
321 :
322 : #define BLK_ALL_ZONES ((unsigned int)-1)
323 : int blkdev_report_zones(struct block_device *bdev, sector_t sector,
324 : unsigned int nr_zones, report_zones_cb cb, void *data);
325 : unsigned int bdev_nr_zones(struct block_device *bdev);
326 : extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
327 : sector_t sectors, sector_t nr_sectors,
328 : gfp_t gfp_mask);
329 : int blk_revalidate_disk_zones(struct gendisk *disk,
330 : void (*update_driver_data)(struct gendisk *disk));
331 :
332 : extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
333 : unsigned int cmd, unsigned long arg);
334 : extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
335 : unsigned int cmd, unsigned long arg);
336 :
337 : #else /* CONFIG_BLK_DEV_ZONED */
338 :
339 : static inline unsigned int bdev_nr_zones(struct block_device *bdev)
340 : {
341 : return 0;
342 : }
343 :
344 : static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
345 : fmode_t mode, unsigned int cmd,
346 : unsigned long arg)
347 : {
348 : return -ENOTTY;
349 : }
350 :
351 : static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
352 : fmode_t mode, unsigned int cmd,
353 : unsigned long arg)
354 : {
355 : return -ENOTTY;
356 : }
357 :
358 : #endif /* CONFIG_BLK_DEV_ZONED */
359 :
360 : /*
361 : * Independent access ranges: struct blk_independent_access_range describes
362 : * a range of contiguous sectors that can be accessed using device command
363 : * execution resources that are independent from the resources used for
364 : * other access ranges. This is typically found with single-LUN multi-actuator
365 : * HDDs where each access range is served by a different set of heads.
366 : * The set of independent ranges supported by the device is defined using
367 : * struct blk_independent_access_ranges. The independent ranges must not overlap
368 : * and must include all sectors within the disk capacity (no sector holes
369 : * allowed).
370 : * For a device with multiple ranges, requests targeting sectors in different
371 : * ranges can be executed in parallel. A request can straddle an access range
372 : * boundary.
373 : */
374 : struct blk_independent_access_range {
375 : struct kobject kobj;
376 : sector_t sector;
377 : sector_t nr_sectors;
378 : };
379 :
380 : struct blk_independent_access_ranges {
381 : struct kobject kobj;
382 : bool sysfs_registered;
383 : unsigned int nr_ia_ranges;
384 : struct blk_independent_access_range ia_range[];
385 : };
386 :
387 : struct request_queue {
388 : struct request *last_merge;
389 : struct elevator_queue *elevator;
390 :
391 : struct percpu_ref q_usage_counter;
392 :
393 : struct blk_queue_stats *stats;
394 : struct rq_qos *rq_qos;
395 :
396 : const struct blk_mq_ops *mq_ops;
397 :
398 : /* sw queues */
399 : struct blk_mq_ctx __percpu *queue_ctx;
400 :
401 : unsigned int queue_depth;
402 :
403 : /* hw dispatch queues */
404 : struct xarray hctx_table;
405 : unsigned int nr_hw_queues;
406 :
407 : /*
408 : * The queue owner gets to use this for whatever they like.
409 : * ll_rw_blk doesn't touch it.
410 : */
411 : void *queuedata;
412 :
413 : /*
414 : * various queue flags, see QUEUE_* below
415 : */
416 : unsigned long queue_flags;
417 : /*
418 : * Number of contexts that have called blk_set_pm_only(). If this
419 : * counter is above zero then only RQF_PM requests are processed.
420 : */
421 : atomic_t pm_only;
422 :
423 : /*
424 : * ida allocated id for this queue. Used to index queues from
425 : * ioctx.
426 : */
427 : int id;
428 :
429 : spinlock_t queue_lock;
430 :
431 : struct gendisk *disk;
432 :
433 : refcount_t refs;
434 :
435 : /*
436 : * mq queue kobject
437 : */
438 : struct kobject *mq_kobj;
439 :
440 : #ifdef CONFIG_BLK_DEV_INTEGRITY
441 : struct blk_integrity integrity;
442 : #endif /* CONFIG_BLK_DEV_INTEGRITY */
443 :
444 : #ifdef CONFIG_PM
445 : struct device *dev;
446 : enum rpm_status rpm_status;
447 : #endif
448 :
449 : /*
450 : * queue settings
451 : */
452 : unsigned long nr_requests; /* Max # of requests */
453 :
454 : unsigned int dma_pad_mask;
455 :
456 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
457 : struct blk_crypto_profile *crypto_profile;
458 : struct kobject *crypto_kobject;
459 : #endif
460 :
461 : unsigned int rq_timeout;
462 :
463 : struct timer_list timeout;
464 : struct work_struct timeout_work;
465 :
466 : atomic_t nr_active_requests_shared_tags;
467 :
468 : struct blk_mq_tags *sched_shared_tags;
469 :
470 : struct list_head icq_list;
471 : #ifdef CONFIG_BLK_CGROUP
472 : DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
473 : struct blkcg_gq *root_blkg;
474 : struct list_head blkg_list;
475 : struct mutex blkcg_mutex;
476 : #endif
477 :
478 : struct queue_limits limits;
479 :
480 : unsigned int required_elevator_features;
481 :
482 : int node;
483 : #ifdef CONFIG_BLK_DEV_IO_TRACE
484 : struct blk_trace __rcu *blk_trace;
485 : #endif
486 : /*
487 : * for flush operations
488 : */
489 : struct blk_flush_queue *fq;
490 :
491 : struct list_head requeue_list;
492 : spinlock_t requeue_lock;
493 : struct delayed_work requeue_work;
494 :
495 : struct mutex sysfs_lock;
496 : struct mutex sysfs_dir_lock;
497 :
498 : /*
499 : * for reusing dead hctx instance in case of updating
500 : * nr_hw_queues
501 : */
502 : struct list_head unused_hctx_list;
503 : spinlock_t unused_hctx_lock;
504 :
505 : int mq_freeze_depth;
506 :
507 : #ifdef CONFIG_BLK_DEV_THROTTLING
508 : /* Throttle data */
509 : struct throtl_data *td;
510 : #endif
511 : struct rcu_head rcu_head;
512 : wait_queue_head_t mq_freeze_wq;
513 : /*
514 : * Protect concurrent access to q_usage_counter by
515 : * percpu_ref_kill() and percpu_ref_reinit().
516 : */
517 : struct mutex mq_freeze_lock;
518 :
519 : int quiesce_depth;
520 :
521 : struct blk_mq_tag_set *tag_set;
522 : struct list_head tag_set_list;
523 :
524 : struct dentry *debugfs_dir;
525 : struct dentry *sched_debugfs_dir;
526 : struct dentry *rqos_debugfs_dir;
527 : /*
528 : * Serializes all debugfs metadata operations using the above dentries.
529 : */
530 : struct mutex debugfs_mutex;
531 :
532 : bool mq_sysfs_init_done;
533 : };
534 :
535 : /* Keep blk_queue_flag_name[] in sync with the definitions below */
536 : #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
537 : #define QUEUE_FLAG_DYING 1 /* queue being torn down */
538 : #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
539 : #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
540 : #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
541 : #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
542 : #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
543 : #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
544 : #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
545 : #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
546 : #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
547 : #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
548 : #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
549 : #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
550 : #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
551 : #define QUEUE_FLAG_WC 17 /* Write back caching */
552 : #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
553 : #define QUEUE_FLAG_DAX 19 /* device supports DAX */
554 : #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
555 : #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
556 : #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
557 : #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
558 : #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
559 : #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
560 : #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
561 : #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
562 : #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
563 : #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
564 :
565 : #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
566 : (1UL << QUEUE_FLAG_SAME_COMP) | \
567 : (1UL << QUEUE_FLAG_NOWAIT))
568 :
569 : void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
570 : void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
571 : bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
572 :
573 : #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
574 : #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
575 : #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
576 : #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
577 : #define blk_queue_noxmerges(q) \
578 : test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
579 : #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
580 : #define blk_queue_stable_writes(q) \
581 : test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
582 : #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
583 : #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
584 : #define blk_queue_zone_resetall(q) \
585 : test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
586 : #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
587 : #define blk_queue_pci_p2pdma(q) \
588 : test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
589 : #ifdef CONFIG_BLK_RQ_ALLOC_TIME
590 : #define blk_queue_rq_alloc_time(q) \
591 : test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
592 : #else
593 : #define blk_queue_rq_alloc_time(q) false
594 : #endif
595 :
596 : #define blk_noretry_request(rq) \
597 : ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
598 : REQ_FAILFAST_DRIVER))
599 : #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
600 : #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
601 : #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
602 : #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
603 : #define blk_queue_skip_tagset_quiesce(q) \
604 : test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags)
605 :
606 : extern void blk_set_pm_only(struct request_queue *q);
607 : extern void blk_clear_pm_only(struct request_queue *q);
608 :
609 : #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
610 :
611 : #define dma_map_bvec(dev, bv, dir, attrs) \
612 : dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
613 : (dir), (attrs))
614 :
615 : static inline bool queue_is_mq(struct request_queue *q)
616 : {
617 : return q->mq_ops;
618 : }
619 :
620 : #ifdef CONFIG_PM
621 : static inline enum rpm_status queue_rpm_status(struct request_queue *q)
622 : {
623 : return q->rpm_status;
624 : }
625 : #else
626 : static inline enum rpm_status queue_rpm_status(struct request_queue *q)
627 : {
628 : return RPM_ACTIVE;
629 : }
630 : #endif
631 :
632 : static inline enum blk_zoned_model
633 : blk_queue_zoned_model(struct request_queue *q)
634 : {
635 : if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
636 : return q->limits.zoned;
637 : return BLK_ZONED_NONE;
638 : }
639 :
640 : static inline bool blk_queue_is_zoned(struct request_queue *q)
641 : {
642 0 : switch (blk_queue_zoned_model(q)) {
643 : case BLK_ZONED_HA:
644 : case BLK_ZONED_HM:
645 : return true;
646 : default:
647 : return false;
648 : }
649 : }
650 :
651 : #ifdef CONFIG_BLK_DEV_ZONED
652 : static inline unsigned int disk_nr_zones(struct gendisk *disk)
653 : {
654 : return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
655 : }
656 :
657 : static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
658 : {
659 : if (!blk_queue_is_zoned(disk->queue))
660 : return 0;
661 : return sector >> ilog2(disk->queue->limits.chunk_sectors);
662 : }
663 :
664 : static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
665 : {
666 : if (!blk_queue_is_zoned(disk->queue))
667 : return false;
668 : if (!disk->conv_zones_bitmap)
669 : return true;
670 : return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
671 : }
672 :
673 : static inline void disk_set_max_open_zones(struct gendisk *disk,
674 : unsigned int max_open_zones)
675 : {
676 : disk->max_open_zones = max_open_zones;
677 : }
678 :
679 : static inline void disk_set_max_active_zones(struct gendisk *disk,
680 : unsigned int max_active_zones)
681 : {
682 : disk->max_active_zones = max_active_zones;
683 : }
684 :
685 : static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
686 : {
687 : return bdev->bd_disk->max_open_zones;
688 : }
689 :
690 : static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
691 : {
692 : return bdev->bd_disk->max_active_zones;
693 : }
694 :
695 : #else /* CONFIG_BLK_DEV_ZONED */
696 : static inline unsigned int disk_nr_zones(struct gendisk *disk)
697 : {
698 : return 0;
699 : }
700 : static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
701 : {
702 : return false;
703 : }
704 : static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
705 : {
706 : return 0;
707 : }
708 : static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
709 : {
710 : return 0;
711 : }
712 :
713 : static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
714 : {
715 : return 0;
716 : }
717 : #endif /* CONFIG_BLK_DEV_ZONED */
718 :
719 : static inline unsigned int blk_queue_depth(struct request_queue *q)
720 : {
721 : if (q->queue_depth)
722 : return q->queue_depth;
723 :
724 : return q->nr_requests;
725 : }
726 :
727 : /*
728 : * default timeout for SG_IO if none specified
729 : */
730 : #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
731 : #define BLK_MIN_SG_TIMEOUT (7 * HZ)
732 :
733 : /* This should not be used directly - use rq_for_each_segment */
734 : #define for_each_bio(_bio) \
735 : for (; _bio; _bio = _bio->bi_next)
736 :
737 : int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
738 : const struct attribute_group **groups);
739 : static inline int __must_check add_disk(struct gendisk *disk)
740 : {
741 : return device_add_disk(NULL, disk, NULL);
742 : }
743 : void del_gendisk(struct gendisk *gp);
744 : void invalidate_disk(struct gendisk *disk);
745 : void set_disk_ro(struct gendisk *disk, bool read_only);
746 : void disk_uevent(struct gendisk *disk, enum kobject_action action);
747 :
748 : static inline int get_disk_ro(struct gendisk *disk)
749 : {
750 0 : return disk->part0->bd_read_only ||
751 0 : test_bit(GD_READ_ONLY, &disk->state);
752 : }
753 :
754 0 : static inline int bdev_read_only(struct block_device *bdev)
755 : {
756 0 : return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
757 : }
758 :
759 : bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
760 : bool disk_force_media_change(struct gendisk *disk, unsigned int events);
761 :
762 : void add_disk_randomness(struct gendisk *disk) __latent_entropy;
763 : void rand_initialize_disk(struct gendisk *disk);
764 :
765 : static inline sector_t get_start_sect(struct block_device *bdev)
766 : {
767 : return bdev->bd_start_sect;
768 : }
769 :
770 : static inline sector_t bdev_nr_sectors(struct block_device *bdev)
771 : {
772 : return bdev->bd_nr_sectors;
773 : }
774 :
775 : static inline loff_t bdev_nr_bytes(struct block_device *bdev)
776 : {
777 0 : return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
778 : }
779 :
780 : static inline sector_t get_capacity(struct gendisk *disk)
781 : {
782 0 : return bdev_nr_sectors(disk->part0);
783 : }
784 :
785 : static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
786 : {
787 : return bdev_nr_sectors(sb->s_bdev) >>
788 : (sb->s_blocksize_bits - SECTOR_SHIFT);
789 : }
790 :
791 : int bdev_disk_changed(struct gendisk *disk, bool invalidate);
792 :
793 : void put_disk(struct gendisk *disk);
794 : struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
795 :
796 : /**
797 : * blk_alloc_disk - allocate a gendisk structure
798 : * @node_id: numa node to allocate on
799 : *
800 : * Allocate and pre-initialize a gendisk structure for use with BIO based
801 : * drivers.
802 : *
803 : * Context: can sleep
804 : */
805 : #define blk_alloc_disk(node_id) \
806 : ({ \
807 : static struct lock_class_key __key; \
808 : \
809 : __blk_alloc_disk(node_id, &__key); \
810 : })
811 :
812 : int __register_blkdev(unsigned int major, const char *name,
813 : void (*probe)(dev_t devt));
814 : #define register_blkdev(major, name) \
815 : __register_blkdev(major, name, NULL)
816 : void unregister_blkdev(unsigned int major, const char *name);
817 :
818 : bool bdev_check_media_change(struct block_device *bdev);
819 : int __invalidate_device(struct block_device *bdev, bool kill_dirty);
820 : void set_capacity(struct gendisk *disk, sector_t size);
821 :
822 : #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
823 : int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
824 : void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
825 : #else
826 : static inline int bd_link_disk_holder(struct block_device *bdev,
827 : struct gendisk *disk)
828 : {
829 : return 0;
830 : }
831 : static inline void bd_unlink_disk_holder(struct block_device *bdev,
832 : struct gendisk *disk)
833 : {
834 : }
835 : #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
836 :
837 : dev_t part_devt(struct gendisk *disk, u8 partno);
838 : void inc_diskseq(struct gendisk *disk);
839 : dev_t blk_lookup_devt(const char *name, int partno);
840 : void blk_request_module(dev_t devt);
841 :
842 : extern int blk_register_queue(struct gendisk *disk);
843 : extern void blk_unregister_queue(struct gendisk *disk);
844 : void submit_bio_noacct(struct bio *bio);
845 : struct bio *bio_split_to_limits(struct bio *bio);
846 :
847 : extern int blk_lld_busy(struct request_queue *q);
848 : extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
849 : extern void blk_queue_exit(struct request_queue *q);
850 : extern void blk_sync_queue(struct request_queue *q);
851 :
852 : /* Helper to convert REQ_OP_XXX to its string format XXX */
853 : extern const char *blk_op_str(enum req_op op);
854 :
855 : int blk_status_to_errno(blk_status_t status);
856 : blk_status_t errno_to_blk_status(int errno);
857 :
858 : /* only poll the hardware once, don't continue until a completion was found */
859 : #define BLK_POLL_ONESHOT (1 << 0)
860 : int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
861 : int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
862 : unsigned int flags);
863 :
864 : static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
865 : {
866 : return bdev->bd_queue; /* this is never NULL */
867 : }
868 :
869 : /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
870 : const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
871 :
872 : static inline unsigned int bio_zone_no(struct bio *bio)
873 : {
874 : return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
875 : }
876 :
877 : static inline unsigned int bio_zone_is_seq(struct bio *bio)
878 : {
879 : return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
880 : }
881 :
882 : /*
883 : * Return how much of the chunk is left to be used for I/O at a given offset.
884 : */
885 : static inline unsigned int blk_chunk_sectors_left(sector_t offset,
886 : unsigned int chunk_sectors)
887 : {
888 0 : if (unlikely(!is_power_of_2(chunk_sectors)))
889 0 : return chunk_sectors - sector_div(offset, chunk_sectors);
890 0 : return chunk_sectors - (offset & (chunk_sectors - 1));
891 : }
892 :
893 : /*
894 : * Access functions for manipulating queue properties
895 : */
896 : void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
897 : extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
898 : extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
899 : extern void blk_queue_max_segments(struct request_queue *, unsigned short);
900 : extern void blk_queue_max_discard_segments(struct request_queue *,
901 : unsigned short);
902 : void blk_queue_max_secure_erase_sectors(struct request_queue *q,
903 : unsigned int max_sectors);
904 : extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
905 : extern void blk_queue_max_discard_sectors(struct request_queue *q,
906 : unsigned int max_discard_sectors);
907 : extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
908 : unsigned int max_write_same_sectors);
909 : extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
910 : extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
911 : unsigned int max_zone_append_sectors);
912 : extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
913 : void blk_queue_zone_write_granularity(struct request_queue *q,
914 : unsigned int size);
915 : extern void blk_queue_alignment_offset(struct request_queue *q,
916 : unsigned int alignment);
917 : void disk_update_readahead(struct gendisk *disk);
918 : extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
919 : extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
920 : extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
921 : extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
922 : extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
923 : extern void blk_set_stacking_limits(struct queue_limits *lim);
924 : extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
925 : sector_t offset);
926 : extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
927 : sector_t offset);
928 : extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
929 : extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
930 : extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
931 : extern void blk_queue_dma_alignment(struct request_queue *, int);
932 : extern void blk_queue_update_dma_alignment(struct request_queue *, int);
933 : extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
934 : extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
935 :
936 : struct blk_independent_access_ranges *
937 : disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
938 : void disk_set_independent_access_ranges(struct gendisk *disk,
939 : struct blk_independent_access_ranges *iars);
940 :
941 : /*
942 : * Elevator features for blk_queue_required_elevator_features:
943 : */
944 : /* Supports zoned block devices sequential write constraint */
945 : #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
946 :
947 : extern void blk_queue_required_elevator_features(struct request_queue *q,
948 : unsigned int features);
949 : extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
950 : struct device *dev);
951 :
952 : bool __must_check blk_get_queue(struct request_queue *);
953 : extern void blk_put_queue(struct request_queue *);
954 :
955 : void blk_mark_disk_dead(struct gendisk *disk);
956 :
957 : #ifdef CONFIG_BLOCK
958 : /*
959 : * blk_plug permits building a queue of related requests by holding the I/O
960 : * fragments for a short period. This allows merging of sequential requests
961 : * into single larger request. As the requests are moved from a per-task list to
962 : * the device's request_queue in a batch, this results in improved scalability
963 : * as the lock contention for request_queue lock is reduced.
964 : *
965 : * It is ok not to disable preemption when adding the request to the plug list
966 : * or when attempting a merge. For details, please see schedule() where
967 : * blk_flush_plug() is called.
968 : */
969 : struct blk_plug {
970 : struct request *mq_list; /* blk-mq requests */
971 :
972 : /* if ios_left is > 1, we can batch tag/rq allocations */
973 : struct request *cached_rq;
974 : unsigned short nr_ios;
975 :
976 : unsigned short rq_count;
977 :
978 : bool multiple_queues;
979 : bool has_elevator;
980 : bool nowait;
981 :
982 : struct list_head cb_list; /* md requires an unplug callback */
983 : };
984 :
985 : struct blk_plug_cb;
986 : typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
987 : struct blk_plug_cb {
988 : struct list_head list;
989 : blk_plug_cb_fn callback;
990 : void *data;
991 : };
992 : extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
993 : void *data, int size);
994 : extern void blk_start_plug(struct blk_plug *);
995 : extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
996 : extern void blk_finish_plug(struct blk_plug *);
997 :
998 : void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
999 : static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1000 : {
1001 2073 : if (plug)
1002 0 : __blk_flush_plug(plug, async);
1003 : }
1004 :
1005 : int blkdev_issue_flush(struct block_device *bdev);
1006 : long nr_blockdev_pages(void);
1007 : #else /* CONFIG_BLOCK */
1008 : struct blk_plug {
1009 : };
1010 :
1011 : static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1012 : unsigned short nr_ios)
1013 : {
1014 : }
1015 :
1016 : static inline void blk_start_plug(struct blk_plug *plug)
1017 : {
1018 : }
1019 :
1020 : static inline void blk_finish_plug(struct blk_plug *plug)
1021 : {
1022 : }
1023 :
1024 : static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1025 : {
1026 : }
1027 :
1028 : static inline int blkdev_issue_flush(struct block_device *bdev)
1029 : {
1030 : return 0;
1031 : }
1032 :
1033 : static inline long nr_blockdev_pages(void)
1034 : {
1035 : return 0;
1036 : }
1037 : #endif /* CONFIG_BLOCK */
1038 :
1039 : extern void blk_io_schedule(void);
1040 :
1041 : int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1042 : sector_t nr_sects, gfp_t gfp_mask);
1043 : int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1044 : sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1045 : int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1046 : sector_t nr_sects, gfp_t gfp);
1047 :
1048 : #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1049 : #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1050 :
1051 : extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1052 : sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1053 : unsigned flags);
1054 : extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1055 : sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1056 :
1057 : static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1058 : sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1059 : {
1060 : return blkdev_issue_discard(sb->s_bdev,
1061 : block << (sb->s_blocksize_bits -
1062 : SECTOR_SHIFT),
1063 : nr_blocks << (sb->s_blocksize_bits -
1064 : SECTOR_SHIFT),
1065 : gfp_mask);
1066 : }
1067 : static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1068 : sector_t nr_blocks, gfp_t gfp_mask)
1069 : {
1070 : return blkdev_issue_zeroout(sb->s_bdev,
1071 : block << (sb->s_blocksize_bits -
1072 : SECTOR_SHIFT),
1073 : nr_blocks << (sb->s_blocksize_bits -
1074 : SECTOR_SHIFT),
1075 : gfp_mask, 0);
1076 : }
1077 :
1078 : static inline bool bdev_is_partition(struct block_device *bdev)
1079 : {
1080 : return bdev->bd_partno;
1081 : }
1082 :
1083 : enum blk_default_limits {
1084 : BLK_MAX_SEGMENTS = 128,
1085 : BLK_SAFE_MAX_SECTORS = 255,
1086 : BLK_MAX_SEGMENT_SIZE = 65536,
1087 : BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1088 : };
1089 :
1090 : #define BLK_DEF_MAX_SECTORS 2560u
1091 :
1092 : static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1093 : {
1094 : return q->limits.seg_boundary_mask;
1095 : }
1096 :
1097 : static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1098 : {
1099 : return q->limits.virt_boundary_mask;
1100 : }
1101 :
1102 : static inline unsigned int queue_max_sectors(const struct request_queue *q)
1103 : {
1104 : return q->limits.max_sectors;
1105 : }
1106 :
1107 : static inline unsigned int queue_max_bytes(struct request_queue *q)
1108 : {
1109 : return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1110 : }
1111 :
1112 : static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1113 : {
1114 : return q->limits.max_hw_sectors;
1115 : }
1116 :
1117 : static inline unsigned short queue_max_segments(const struct request_queue *q)
1118 : {
1119 : return q->limits.max_segments;
1120 : }
1121 :
1122 : static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1123 : {
1124 : return q->limits.max_discard_segments;
1125 : }
1126 :
1127 : static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1128 : {
1129 : return q->limits.max_segment_size;
1130 : }
1131 :
1132 : static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1133 : {
1134 :
1135 0 : const struct queue_limits *l = &q->limits;
1136 :
1137 0 : return min(l->max_zone_append_sectors, l->max_sectors);
1138 : }
1139 :
1140 : static inline unsigned int
1141 : bdev_max_zone_append_sectors(struct block_device *bdev)
1142 : {
1143 : return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1144 : }
1145 :
1146 : static inline unsigned int bdev_max_segments(struct block_device *bdev)
1147 : {
1148 : return queue_max_segments(bdev_get_queue(bdev));
1149 : }
1150 :
1151 : static inline unsigned queue_logical_block_size(const struct request_queue *q)
1152 : {
1153 0 : int retval = 512;
1154 :
1155 0 : if (q && q->limits.logical_block_size)
1156 0 : retval = q->limits.logical_block_size;
1157 :
1158 0 : return retval;
1159 : }
1160 :
1161 : static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1162 : {
1163 0 : return queue_logical_block_size(bdev_get_queue(bdev));
1164 : }
1165 :
1166 : static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1167 : {
1168 : return q->limits.physical_block_size;
1169 : }
1170 :
1171 : static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1172 : {
1173 0 : return queue_physical_block_size(bdev_get_queue(bdev));
1174 : }
1175 :
1176 : static inline unsigned int queue_io_min(const struct request_queue *q)
1177 : {
1178 : return q->limits.io_min;
1179 : }
1180 :
1181 : static inline int bdev_io_min(struct block_device *bdev)
1182 : {
1183 0 : return queue_io_min(bdev_get_queue(bdev));
1184 : }
1185 :
1186 : static inline unsigned int queue_io_opt(const struct request_queue *q)
1187 : {
1188 : return q->limits.io_opt;
1189 : }
1190 :
1191 : static inline int bdev_io_opt(struct block_device *bdev)
1192 : {
1193 0 : return queue_io_opt(bdev_get_queue(bdev));
1194 : }
1195 :
1196 : static inline unsigned int
1197 : queue_zone_write_granularity(const struct request_queue *q)
1198 : {
1199 : return q->limits.zone_write_granularity;
1200 : }
1201 :
1202 : static inline unsigned int
1203 : bdev_zone_write_granularity(struct block_device *bdev)
1204 : {
1205 : return queue_zone_write_granularity(bdev_get_queue(bdev));
1206 : }
1207 :
1208 : int bdev_alignment_offset(struct block_device *bdev);
1209 : unsigned int bdev_discard_alignment(struct block_device *bdev);
1210 :
1211 : static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1212 : {
1213 0 : return bdev_get_queue(bdev)->limits.max_discard_sectors;
1214 : }
1215 :
1216 : static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1217 : {
1218 0 : return bdev_get_queue(bdev)->limits.discard_granularity;
1219 : }
1220 :
1221 : static inline unsigned int
1222 : bdev_max_secure_erase_sectors(struct block_device *bdev)
1223 : {
1224 0 : return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1225 : }
1226 :
1227 : static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1228 : {
1229 0 : struct request_queue *q = bdev_get_queue(bdev);
1230 :
1231 0 : if (q)
1232 0 : return q->limits.max_write_zeroes_sectors;
1233 :
1234 : return 0;
1235 : }
1236 :
1237 : static inline bool bdev_nonrot(struct block_device *bdev)
1238 : {
1239 0 : return blk_queue_nonrot(bdev_get_queue(bdev));
1240 : }
1241 :
1242 : static inline bool bdev_synchronous(struct block_device *bdev)
1243 : {
1244 0 : return test_bit(QUEUE_FLAG_SYNCHRONOUS,
1245 : &bdev_get_queue(bdev)->queue_flags);
1246 : }
1247 :
1248 : static inline bool bdev_stable_writes(struct block_device *bdev)
1249 : {
1250 0 : return test_bit(QUEUE_FLAG_STABLE_WRITES,
1251 : &bdev_get_queue(bdev)->queue_flags);
1252 : }
1253 :
1254 : static inline bool bdev_write_cache(struct block_device *bdev)
1255 : {
1256 : return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1257 : }
1258 :
1259 : static inline bool bdev_fua(struct block_device *bdev)
1260 : {
1261 : return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1262 : }
1263 :
1264 : static inline bool bdev_nowait(struct block_device *bdev)
1265 : {
1266 0 : return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1267 : }
1268 :
1269 : static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1270 : {
1271 : return blk_queue_zoned_model(bdev_get_queue(bdev));
1272 : }
1273 :
1274 : static inline bool bdev_is_zoned(struct block_device *bdev)
1275 : {
1276 0 : return blk_queue_is_zoned(bdev_get_queue(bdev));
1277 : }
1278 :
1279 : static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1280 : {
1281 : return disk_zone_no(bdev->bd_disk, sec);
1282 : }
1283 :
1284 : static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
1285 : blk_opf_t op)
1286 : {
1287 : if (!bdev_is_zoned(bdev))
1288 : return false;
1289 :
1290 : return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
1291 : }
1292 :
1293 : static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1294 : {
1295 0 : struct request_queue *q = bdev_get_queue(bdev);
1296 :
1297 : if (!blk_queue_is_zoned(q))
1298 : return 0;
1299 : return q->limits.chunk_sectors;
1300 : }
1301 :
1302 : static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1303 : sector_t sector)
1304 : {
1305 : return sector & (bdev_zone_sectors(bdev) - 1);
1306 : }
1307 :
1308 : static inline bool bdev_is_zone_start(struct block_device *bdev,
1309 : sector_t sector)
1310 : {
1311 : return bdev_offset_from_zone_start(bdev, sector) == 0;
1312 : }
1313 :
1314 : static inline int queue_dma_alignment(const struct request_queue *q)
1315 : {
1316 0 : return q ? q->limits.dma_alignment : 511;
1317 : }
1318 :
1319 : static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1320 : {
1321 0 : return queue_dma_alignment(bdev_get_queue(bdev));
1322 : }
1323 :
1324 0 : static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1325 : struct iov_iter *iter)
1326 : {
1327 0 : return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1328 0 : bdev_logical_block_size(bdev) - 1);
1329 : }
1330 :
1331 : static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1332 : unsigned int len)
1333 : {
1334 0 : unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1335 0 : return !(addr & alignment) && !(len & alignment);
1336 : }
1337 :
1338 : /* assumes size > 256 */
1339 0 : static inline unsigned int blksize_bits(unsigned int size)
1340 : {
1341 0 : return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1342 : }
1343 :
1344 : static inline unsigned int block_size(struct block_device *bdev)
1345 : {
1346 0 : return 1 << bdev->bd_inode->i_blkbits;
1347 : }
1348 :
1349 : int kblockd_schedule_work(struct work_struct *work);
1350 : int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1351 :
1352 : #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1353 : MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1354 : #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1355 : MODULE_ALIAS("block-major-" __stringify(major) "-*")
1356 :
1357 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1358 :
1359 : bool blk_crypto_register(struct blk_crypto_profile *profile,
1360 : struct request_queue *q);
1361 :
1362 : #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1363 :
1364 : static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1365 : struct request_queue *q)
1366 : {
1367 : return true;
1368 : }
1369 :
1370 : #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1371 :
1372 : enum blk_unique_id {
1373 : /* these match the Designator Types specified in SPC */
1374 : BLK_UID_T10 = 1,
1375 : BLK_UID_EUI64 = 2,
1376 : BLK_UID_NAA = 3,
1377 : };
1378 :
1379 : struct block_device_operations {
1380 : void (*submit_bio)(struct bio *bio);
1381 : int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1382 : unsigned int flags);
1383 : int (*open) (struct block_device *, fmode_t);
1384 : void (*release) (struct gendisk *, fmode_t);
1385 : int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1386 : int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1387 : unsigned int (*check_events) (struct gendisk *disk,
1388 : unsigned int clearing);
1389 : void (*unlock_native_capacity) (struct gendisk *);
1390 : int (*getgeo)(struct block_device *, struct hd_geometry *);
1391 : int (*set_read_only)(struct block_device *bdev, bool ro);
1392 : void (*free_disk)(struct gendisk *disk);
1393 : /* this callback is with swap_lock and sometimes page table lock held */
1394 : void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1395 : int (*report_zones)(struct gendisk *, sector_t sector,
1396 : unsigned int nr_zones, report_zones_cb cb, void *data);
1397 : char *(*devnode)(struct gendisk *disk, umode_t *mode);
1398 : /* returns the length of the identifier or a negative errno: */
1399 : int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1400 : enum blk_unique_id id_type);
1401 : struct module *owner;
1402 : const struct pr_ops *pr_ops;
1403 :
1404 : /*
1405 : * Special callback for probing GPT entry at a given sector.
1406 : * Needed by Android devices, used by GPT scanner and MMC blk
1407 : * driver.
1408 : */
1409 : int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1410 : };
1411 :
1412 : #ifdef CONFIG_COMPAT
1413 : extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1414 : unsigned int, unsigned long);
1415 : #else
1416 : #define blkdev_compat_ptr_ioctl NULL
1417 : #endif
1418 :
1419 : static inline void blk_wake_io_task(struct task_struct *waiter)
1420 : {
1421 : /*
1422 : * If we're polling, the task itself is doing the completions. For
1423 : * that case, we don't need to signal a wakeup, it's enough to just
1424 : * mark us as RUNNING.
1425 : */
1426 0 : if (waiter == current)
1427 0 : __set_current_state(TASK_RUNNING);
1428 : else
1429 0 : wake_up_process(waiter);
1430 : }
1431 :
1432 : unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1433 : unsigned long start_time);
1434 : void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1435 : unsigned int sectors, unsigned long start_time);
1436 :
1437 : unsigned long bio_start_io_acct(struct bio *bio);
1438 : void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1439 : struct block_device *orig_bdev);
1440 :
1441 : /**
1442 : * bio_end_io_acct - end I/O accounting for bio based drivers
1443 : * @bio: bio to end account for
1444 : * @start_time: start time returned by bio_start_io_acct()
1445 : */
1446 : static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1447 : {
1448 : return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1449 : }
1450 :
1451 : int bdev_read_only(struct block_device *bdev);
1452 : int set_blocksize(struct block_device *bdev, int size);
1453 :
1454 : int lookup_bdev(const char *pathname, dev_t *dev);
1455 :
1456 : void blkdev_show(struct seq_file *seqf, off_t offset);
1457 :
1458 : #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1459 : #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1460 : #ifdef CONFIG_BLOCK
1461 : #define BLKDEV_MAJOR_MAX 512
1462 : #else
1463 : #define BLKDEV_MAJOR_MAX 0
1464 : #endif
1465 :
1466 : struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1467 : void *holder);
1468 : struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1469 : int bd_prepare_to_claim(struct block_device *bdev, void *holder);
1470 : void bd_abort_claiming(struct block_device *bdev, void *holder);
1471 : void blkdev_put(struct block_device *bdev, fmode_t mode);
1472 :
1473 : /* just for blk-cgroup, don't use elsewhere */
1474 : struct block_device *blkdev_get_no_open(dev_t dev);
1475 : void blkdev_put_no_open(struct block_device *bdev);
1476 :
1477 : struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
1478 : void bdev_add(struct block_device *bdev, dev_t dev);
1479 : struct block_device *I_BDEV(struct inode *inode);
1480 : int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
1481 : loff_t lend);
1482 :
1483 : #ifdef CONFIG_BLOCK
1484 : void invalidate_bdev(struct block_device *bdev);
1485 : int sync_blockdev(struct block_device *bdev);
1486 : int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1487 : int sync_blockdev_nowait(struct block_device *bdev);
1488 : void sync_bdevs(bool wait);
1489 : void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1490 : void printk_all_partitions(void);
1491 : #else
1492 : static inline void invalidate_bdev(struct block_device *bdev)
1493 : {
1494 : }
1495 : static inline int sync_blockdev(struct block_device *bdev)
1496 : {
1497 : return 0;
1498 : }
1499 : static inline int sync_blockdev_nowait(struct block_device *bdev)
1500 : {
1501 : return 0;
1502 : }
1503 : static inline void sync_bdevs(bool wait)
1504 : {
1505 : }
1506 : static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1507 : {
1508 : }
1509 : static inline void printk_all_partitions(void)
1510 : {
1511 : }
1512 : #endif /* CONFIG_BLOCK */
1513 :
1514 : int fsync_bdev(struct block_device *bdev);
1515 :
1516 : int freeze_bdev(struct block_device *bdev);
1517 : int thaw_bdev(struct block_device *bdev);
1518 :
1519 : struct io_comp_batch {
1520 : struct request *req_list;
1521 : bool need_ts;
1522 : void (*complete)(struct io_comp_batch *);
1523 : };
1524 :
1525 : #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1526 :
1527 : #endif /* _LINUX_BLKDEV_H */
|
