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/srcu.h>
26 : #include <linux/uuid.h>
27 : #include <linux/xarray.h>
28 :
29 : struct module;
30 : struct request_queue;
31 : struct elevator_queue;
32 : struct blk_trace;
33 : struct request;
34 : struct sg_io_hdr;
35 : struct blkcg_gq;
36 : struct blk_flush_queue;
37 : struct kiocb;
38 : struct pr_ops;
39 : struct rq_qos;
40 : struct blk_queue_stats;
41 : struct blk_stat_callback;
42 : struct blk_crypto_profile;
43 :
44 : extern const struct device_type disk_type;
45 : extern struct device_type part_type;
46 : extern struct class block_class;
47 :
48 : /* Must be consistent with blk_mq_poll_stats_bkt() */
49 : #define BLK_MQ_POLL_STATS_BKTS 16
50 :
51 : /* Doing classic polling */
52 : #define BLK_MQ_POLL_CLASSIC -1
53 :
54 : /*
55 : * Maximum number of blkcg policies allowed to be registered concurrently.
56 : * Defined here to simplify include dependency.
57 : */
58 : #define BLKCG_MAX_POLS 6
59 :
60 : #define DISK_MAX_PARTS 256
61 : #define DISK_NAME_LEN 32
62 :
63 : #define PARTITION_META_INFO_VOLNAMELTH 64
64 : /*
65 : * Enough for the string representation of any kind of UUID plus NULL.
66 : * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
67 : */
68 : #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
69 :
70 : struct partition_meta_info {
71 : char uuid[PARTITION_META_INFO_UUIDLTH];
72 : u8 volname[PARTITION_META_INFO_VOLNAMELTH];
73 : };
74 :
75 : /**
76 : * DOC: genhd capability flags
77 : *
78 : * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
79 : * removable media. When set, the device remains present even when media is not
80 : * inserted. Shall not be set for devices which are removed entirely when the
81 : * media is removed.
82 : *
83 : * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
84 : * doesn't appear in sysfs, and can't be opened from userspace or using
85 : * blkdev_get*. Used for the underlying components of multipath devices.
86 : *
87 : * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
88 : * scan for partitions from add_disk, and users can't add partitions manually.
89 : *
90 : */
91 : enum {
92 : GENHD_FL_REMOVABLE = 1 << 0,
93 : GENHD_FL_HIDDEN = 1 << 1,
94 : GENHD_FL_NO_PART = 1 << 2,
95 : };
96 :
97 : enum {
98 : DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
99 : DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
100 : };
101 :
102 : enum {
103 : /* Poll even if events_poll_msecs is unset */
104 : DISK_EVENT_FLAG_POLL = 1 << 0,
105 : /* Forward events to udev */
106 : DISK_EVENT_FLAG_UEVENT = 1 << 1,
107 : /* Block event polling when open for exclusive write */
108 : DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
109 : };
110 :
111 : struct disk_events;
112 : struct badblocks;
113 :
114 : struct blk_integrity {
115 : const struct blk_integrity_profile *profile;
116 : unsigned char flags;
117 : unsigned char tuple_size;
118 : unsigned char interval_exp;
119 : unsigned char tag_size;
120 : };
121 :
122 : struct gendisk {
123 : /*
124 : * major/first_minor/minors should not be set by any new driver, the
125 : * block core will take care of allocating them automatically.
126 : */
127 : int major;
128 : int first_minor;
129 : int minors;
130 :
131 : char disk_name[DISK_NAME_LEN]; /* name of major driver */
132 :
133 : unsigned short events; /* supported events */
134 : unsigned short event_flags; /* flags related to event processing */
135 :
136 : struct xarray part_tbl;
137 : struct block_device *part0;
138 :
139 : const struct block_device_operations *fops;
140 : struct request_queue *queue;
141 : void *private_data;
142 :
143 : int flags;
144 : unsigned long state;
145 : #define GD_NEED_PART_SCAN 0
146 : #define GD_READ_ONLY 1
147 : #define GD_DEAD 2
148 : #define GD_NATIVE_CAPACITY 3
149 : #define GD_ADDED 4
150 :
151 : struct mutex open_mutex; /* open/close mutex */
152 : unsigned open_partitions; /* number of open partitions */
153 :
154 : struct backing_dev_info *bdi;
155 : struct kobject *slave_dir;
156 : #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
157 : struct list_head slave_bdevs;
158 : #endif
159 : struct timer_rand_state *random;
160 : atomic_t sync_io; /* RAID */
161 : struct disk_events *ev;
162 : #ifdef CONFIG_BLK_DEV_INTEGRITY
163 : struct kobject integrity_kobj;
164 : #endif /* CONFIG_BLK_DEV_INTEGRITY */
165 : #if IS_ENABLED(CONFIG_CDROM)
166 : struct cdrom_device_info *cdi;
167 : #endif
168 : int node_id;
169 : struct badblocks *bb;
170 : struct lockdep_map lockdep_map;
171 : u64 diskseq;
172 : };
173 :
174 : static inline bool disk_live(struct gendisk *disk)
175 : {
176 0 : return !inode_unhashed(disk->part0->bd_inode);
177 : }
178 :
179 : /*
180 : * The gendisk is refcounted by the part0 block_device, and the bd_device
181 : * therein is also used for device model presentation in sysfs.
182 : */
183 : #define dev_to_disk(device) \
184 : (dev_to_bdev(device)->bd_disk)
185 : #define disk_to_dev(disk) \
186 : (&((disk)->part0->bd_device))
187 :
188 : #if IS_REACHABLE(CONFIG_CDROM)
189 : #define disk_to_cdi(disk) ((disk)->cdi)
190 : #else
191 : #define disk_to_cdi(disk) NULL
192 : #endif
193 :
194 : static inline dev_t disk_devt(struct gendisk *disk)
195 : {
196 0 : return MKDEV(disk->major, disk->first_minor);
197 : }
198 :
199 : static inline int blk_validate_block_size(unsigned long bsize)
200 : {
201 : if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
202 : return -EINVAL;
203 :
204 : return 0;
205 : }
206 :
207 : static inline bool blk_op_is_passthrough(unsigned int op)
208 : {
209 0 : op &= REQ_OP_MASK;
210 0 : return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
211 : }
212 :
213 : /*
214 : * Zoned block device models (zoned limit).
215 : *
216 : * Note: This needs to be ordered from the least to the most severe
217 : * restrictions for the inheritance in blk_stack_limits() to work.
218 : */
219 : enum blk_zoned_model {
220 : BLK_ZONED_NONE = 0, /* Regular block device */
221 : BLK_ZONED_HA, /* Host-aware zoned block device */
222 : BLK_ZONED_HM, /* Host-managed zoned block device */
223 : };
224 :
225 : /*
226 : * BLK_BOUNCE_NONE: never bounce (default)
227 : * BLK_BOUNCE_HIGH: bounce all highmem pages
228 : */
229 : enum blk_bounce {
230 : BLK_BOUNCE_NONE,
231 : BLK_BOUNCE_HIGH,
232 : };
233 :
234 : struct queue_limits {
235 : enum blk_bounce bounce;
236 : unsigned long seg_boundary_mask;
237 : unsigned long virt_boundary_mask;
238 :
239 : unsigned int max_hw_sectors;
240 : unsigned int max_dev_sectors;
241 : unsigned int chunk_sectors;
242 : unsigned int max_sectors;
243 : unsigned int max_segment_size;
244 : unsigned int physical_block_size;
245 : unsigned int logical_block_size;
246 : unsigned int alignment_offset;
247 : unsigned int io_min;
248 : unsigned int io_opt;
249 : unsigned int max_discard_sectors;
250 : unsigned int max_hw_discard_sectors;
251 : unsigned int max_write_zeroes_sectors;
252 : unsigned int max_zone_append_sectors;
253 : unsigned int discard_granularity;
254 : unsigned int discard_alignment;
255 : unsigned int zone_write_granularity;
256 :
257 : unsigned short max_segments;
258 : unsigned short max_integrity_segments;
259 : unsigned short max_discard_segments;
260 :
261 : unsigned char misaligned;
262 : unsigned char discard_misaligned;
263 : unsigned char raid_partial_stripes_expensive;
264 : enum blk_zoned_model zoned;
265 : };
266 :
267 : typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
268 : void *data);
269 :
270 : void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
271 :
272 : #ifdef CONFIG_BLK_DEV_ZONED
273 :
274 : #define BLK_ALL_ZONES ((unsigned int)-1)
275 : int blkdev_report_zones(struct block_device *bdev, sector_t sector,
276 : unsigned int nr_zones, report_zones_cb cb, void *data);
277 : unsigned int blkdev_nr_zones(struct gendisk *disk);
278 : extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
279 : sector_t sectors, sector_t nr_sectors,
280 : gfp_t gfp_mask);
281 : int blk_revalidate_disk_zones(struct gendisk *disk,
282 : void (*update_driver_data)(struct gendisk *disk));
283 :
284 : extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
285 : unsigned int cmd, unsigned long arg);
286 : extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
287 : unsigned int cmd, unsigned long arg);
288 :
289 : #else /* CONFIG_BLK_DEV_ZONED */
290 :
291 : static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
292 : {
293 : return 0;
294 : }
295 :
296 : static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
297 : fmode_t mode, unsigned int cmd,
298 : unsigned long arg)
299 : {
300 : return -ENOTTY;
301 : }
302 :
303 : static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
304 : fmode_t mode, unsigned int cmd,
305 : unsigned long arg)
306 : {
307 : return -ENOTTY;
308 : }
309 :
310 : #endif /* CONFIG_BLK_DEV_ZONED */
311 :
312 : /*
313 : * Independent access ranges: struct blk_independent_access_range describes
314 : * a range of contiguous sectors that can be accessed using device command
315 : * execution resources that are independent from the resources used for
316 : * other access ranges. This is typically found with single-LUN multi-actuator
317 : * HDDs where each access range is served by a different set of heads.
318 : * The set of independent ranges supported by the device is defined using
319 : * struct blk_independent_access_ranges. The independent ranges must not overlap
320 : * and must include all sectors within the disk capacity (no sector holes
321 : * allowed).
322 : * For a device with multiple ranges, requests targeting sectors in different
323 : * ranges can be executed in parallel. A request can straddle an access range
324 : * boundary.
325 : */
326 : struct blk_independent_access_range {
327 : struct kobject kobj;
328 : struct request_queue *queue;
329 : sector_t sector;
330 : sector_t nr_sectors;
331 : };
332 :
333 : struct blk_independent_access_ranges {
334 : struct kobject kobj;
335 : bool sysfs_registered;
336 : unsigned int nr_ia_ranges;
337 : struct blk_independent_access_range ia_range[];
338 : };
339 :
340 : struct request_queue {
341 : struct request *last_merge;
342 : struct elevator_queue *elevator;
343 :
344 : struct percpu_ref q_usage_counter;
345 :
346 : struct blk_queue_stats *stats;
347 : struct rq_qos *rq_qos;
348 :
349 : const struct blk_mq_ops *mq_ops;
350 :
351 : /* sw queues */
352 : struct blk_mq_ctx __percpu *queue_ctx;
353 :
354 : unsigned int queue_depth;
355 :
356 : /* hw dispatch queues */
357 : struct xarray hctx_table;
358 : unsigned int nr_hw_queues;
359 :
360 : /*
361 : * The queue owner gets to use this for whatever they like.
362 : * ll_rw_blk doesn't touch it.
363 : */
364 : void *queuedata;
365 :
366 : /*
367 : * various queue flags, see QUEUE_* below
368 : */
369 : unsigned long queue_flags;
370 : /*
371 : * Number of contexts that have called blk_set_pm_only(). If this
372 : * counter is above zero then only RQF_PM requests are processed.
373 : */
374 : atomic_t pm_only;
375 :
376 : /*
377 : * ida allocated id for this queue. Used to index queues from
378 : * ioctx.
379 : */
380 : int id;
381 :
382 : spinlock_t queue_lock;
383 :
384 : struct gendisk *disk;
385 :
386 : /*
387 : * queue kobject
388 : */
389 : struct kobject kobj;
390 :
391 : /*
392 : * mq queue kobject
393 : */
394 : struct kobject *mq_kobj;
395 :
396 : #ifdef CONFIG_BLK_DEV_INTEGRITY
397 : struct blk_integrity integrity;
398 : #endif /* CONFIG_BLK_DEV_INTEGRITY */
399 :
400 : #ifdef CONFIG_PM
401 : struct device *dev;
402 : enum rpm_status rpm_status;
403 : #endif
404 :
405 : /*
406 : * queue settings
407 : */
408 : unsigned long nr_requests; /* Max # of requests */
409 :
410 : unsigned int dma_pad_mask;
411 : unsigned int dma_alignment;
412 :
413 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
414 : struct blk_crypto_profile *crypto_profile;
415 : struct kobject *crypto_kobject;
416 : #endif
417 :
418 : unsigned int rq_timeout;
419 : int poll_nsec;
420 :
421 : struct blk_stat_callback *poll_cb;
422 : struct blk_rq_stat *poll_stat;
423 :
424 : struct timer_list timeout;
425 : struct work_struct timeout_work;
426 :
427 : atomic_t nr_active_requests_shared_tags;
428 :
429 : struct blk_mq_tags *sched_shared_tags;
430 :
431 : struct list_head icq_list;
432 : #ifdef CONFIG_BLK_CGROUP
433 : DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
434 : struct blkcg_gq *root_blkg;
435 : struct list_head blkg_list;
436 : #endif
437 :
438 : struct queue_limits limits;
439 :
440 : unsigned int required_elevator_features;
441 :
442 : #ifdef CONFIG_BLK_DEV_ZONED
443 : /*
444 : * Zoned block device information for request dispatch control.
445 : * nr_zones is the total number of zones of the device. This is always
446 : * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
447 : * bits which indicates if a zone is conventional (bit set) or
448 : * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
449 : * bits which indicates if a zone is write locked, that is, if a write
450 : * request targeting the zone was dispatched. All three fields are
451 : * initialized by the low level device driver (e.g. scsi/sd.c).
452 : * Stacking drivers (device mappers) may or may not initialize
453 : * these fields.
454 : *
455 : * Reads of this information must be protected with blk_queue_enter() /
456 : * blk_queue_exit(). Modifying this information is only allowed while
457 : * no requests are being processed. See also blk_mq_freeze_queue() and
458 : * blk_mq_unfreeze_queue().
459 : */
460 : unsigned int nr_zones;
461 : unsigned long *conv_zones_bitmap;
462 : unsigned long *seq_zones_wlock;
463 : unsigned int max_open_zones;
464 : unsigned int max_active_zones;
465 : #endif /* CONFIG_BLK_DEV_ZONED */
466 :
467 : int node;
468 : struct mutex debugfs_mutex;
469 : #ifdef CONFIG_BLK_DEV_IO_TRACE
470 : struct blk_trace __rcu *blk_trace;
471 : #endif
472 : /*
473 : * for flush operations
474 : */
475 : struct blk_flush_queue *fq;
476 :
477 : struct list_head requeue_list;
478 : spinlock_t requeue_lock;
479 : struct delayed_work requeue_work;
480 :
481 : struct mutex sysfs_lock;
482 : struct mutex sysfs_dir_lock;
483 :
484 : /*
485 : * for reusing dead hctx instance in case of updating
486 : * nr_hw_queues
487 : */
488 : struct list_head unused_hctx_list;
489 : spinlock_t unused_hctx_lock;
490 :
491 : int mq_freeze_depth;
492 :
493 : #ifdef CONFIG_BLK_DEV_THROTTLING
494 : /* Throttle data */
495 : struct throtl_data *td;
496 : #endif
497 : struct rcu_head rcu_head;
498 : wait_queue_head_t mq_freeze_wq;
499 : /*
500 : * Protect concurrent access to q_usage_counter by
501 : * percpu_ref_kill() and percpu_ref_reinit().
502 : */
503 : struct mutex mq_freeze_lock;
504 :
505 : int quiesce_depth;
506 :
507 : struct blk_mq_tag_set *tag_set;
508 : struct list_head tag_set_list;
509 : struct bio_set bio_split;
510 :
511 : struct dentry *debugfs_dir;
512 :
513 : #ifdef CONFIG_BLK_DEBUG_FS
514 : struct dentry *sched_debugfs_dir;
515 : struct dentry *rqos_debugfs_dir;
516 : #endif
517 :
518 : bool mq_sysfs_init_done;
519 :
520 : /*
521 : * Independent sector access ranges. This is always NULL for
522 : * devices that do not have multiple independent access ranges.
523 : */
524 : struct blk_independent_access_ranges *ia_ranges;
525 :
526 : /**
527 : * @srcu: Sleepable RCU. Use as lock when type of the request queue
528 : * is blocking (BLK_MQ_F_BLOCKING). Must be the last member
529 : */
530 : struct srcu_struct srcu[];
531 : };
532 :
533 : /* Keep blk_queue_flag_name[] in sync with the definitions below */
534 : #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
535 : #define QUEUE_FLAG_DYING 1 /* queue being torn down */
536 : #define QUEUE_FLAG_HAS_SRCU 2 /* SRCU is allocated */
537 : #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
538 : #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
539 : #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
540 : #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
541 : #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
542 : #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
543 : #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
544 : #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
545 : #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
546 : #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
547 : #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
548 : #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
549 : #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
550 : #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
551 : #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
552 : #define QUEUE_FLAG_WC 17 /* Write back caching */
553 : #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
554 : #define QUEUE_FLAG_DAX 19 /* device supports DAX */
555 : #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
556 : #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
557 : #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
558 : #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
559 : #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
560 : #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
561 : #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
562 : #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
563 :
564 : #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
565 : (1 << QUEUE_FLAG_SAME_COMP) | \
566 : (1 << QUEUE_FLAG_NOWAIT))
567 :
568 : void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
569 : void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
570 : bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
571 :
572 : #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
573 : #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
574 : #define blk_queue_has_srcu(q) test_bit(QUEUE_FLAG_HAS_SRCU, &(q)->queue_flags)
575 : #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
576 : #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
577 : #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
578 : #define blk_queue_noxmerges(q) \
579 : test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
580 : #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
581 : #define blk_queue_stable_writes(q) \
582 : test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
583 : #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
584 : #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
585 : #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
586 : #define blk_queue_zone_resetall(q) \
587 : test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
588 : #define blk_queue_secure_erase(q) \
589 : (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
590 : #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
591 : #define blk_queue_pci_p2pdma(q) \
592 : test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
593 : #ifdef CONFIG_BLK_RQ_ALLOC_TIME
594 : #define blk_queue_rq_alloc_time(q) \
595 : test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
596 : #else
597 : #define blk_queue_rq_alloc_time(q) false
598 : #endif
599 :
600 : #define blk_noretry_request(rq) \
601 : ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
602 : REQ_FAILFAST_DRIVER))
603 : #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
604 : #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
605 : #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
606 : #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
607 : #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
608 :
609 : extern void blk_set_pm_only(struct request_queue *q);
610 : extern void blk_clear_pm_only(struct request_queue *q);
611 :
612 : #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
613 :
614 : #define dma_map_bvec(dev, bv, dir, attrs) \
615 : dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
616 : (dir), (attrs))
617 :
618 : static inline bool queue_is_mq(struct request_queue *q)
619 : {
620 0 : return q->mq_ops;
621 : }
622 :
623 : #ifdef CONFIG_PM
624 : static inline enum rpm_status queue_rpm_status(struct request_queue *q)
625 : {
626 0 : return q->rpm_status;
627 : }
628 : #else
629 : static inline enum rpm_status queue_rpm_status(struct request_queue *q)
630 : {
631 : return RPM_ACTIVE;
632 : }
633 : #endif
634 :
635 : static inline enum blk_zoned_model
636 : blk_queue_zoned_model(struct request_queue *q)
637 : {
638 : if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
639 : return q->limits.zoned;
640 : return BLK_ZONED_NONE;
641 : }
642 :
643 : static inline bool blk_queue_is_zoned(struct request_queue *q)
644 : {
645 0 : switch (blk_queue_zoned_model(q)) {
646 : case BLK_ZONED_HA:
647 : case BLK_ZONED_HM:
648 : return true;
649 : default:
650 : return false;
651 : }
652 : }
653 :
654 : static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
655 : {
656 : return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
657 : }
658 :
659 : #ifdef CONFIG_BLK_DEV_ZONED
660 : static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
661 : {
662 : return blk_queue_is_zoned(q) ? q->nr_zones : 0;
663 : }
664 :
665 : static inline unsigned int blk_queue_zone_no(struct request_queue *q,
666 : sector_t sector)
667 : {
668 : if (!blk_queue_is_zoned(q))
669 : return 0;
670 : return sector >> ilog2(q->limits.chunk_sectors);
671 : }
672 :
673 : static inline bool blk_queue_zone_is_seq(struct request_queue *q,
674 : sector_t sector)
675 : {
676 : if (!blk_queue_is_zoned(q))
677 : return false;
678 : if (!q->conv_zones_bitmap)
679 : return true;
680 : return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
681 : }
682 :
683 : static inline void blk_queue_max_open_zones(struct request_queue *q,
684 : unsigned int max_open_zones)
685 : {
686 : q->max_open_zones = max_open_zones;
687 : }
688 :
689 : static inline unsigned int queue_max_open_zones(const struct request_queue *q)
690 : {
691 : return q->max_open_zones;
692 : }
693 :
694 : static inline void blk_queue_max_active_zones(struct request_queue *q,
695 : unsigned int max_active_zones)
696 : {
697 : q->max_active_zones = max_active_zones;
698 : }
699 :
700 : static inline unsigned int queue_max_active_zones(const struct request_queue *q)
701 : {
702 : return q->max_active_zones;
703 : }
704 : #else /* CONFIG_BLK_DEV_ZONED */
705 : static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
706 : {
707 : return 0;
708 : }
709 : static inline bool blk_queue_zone_is_seq(struct request_queue *q,
710 : sector_t sector)
711 : {
712 : return false;
713 : }
714 : static inline unsigned int blk_queue_zone_no(struct request_queue *q,
715 : sector_t sector)
716 : {
717 : return 0;
718 : }
719 : static inline unsigned int queue_max_open_zones(const struct request_queue *q)
720 : {
721 : return 0;
722 : }
723 : static inline unsigned int queue_max_active_zones(const struct request_queue *q)
724 : {
725 : return 0;
726 : }
727 : #endif /* CONFIG_BLK_DEV_ZONED */
728 :
729 : static inline unsigned int blk_queue_depth(struct request_queue *q)
730 : {
731 : if (q->queue_depth)
732 : return q->queue_depth;
733 :
734 : return q->nr_requests;
735 : }
736 :
737 : /*
738 : * default timeout for SG_IO if none specified
739 : */
740 : #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
741 : #define BLK_MIN_SG_TIMEOUT (7 * HZ)
742 :
743 : /* This should not be used directly - use rq_for_each_segment */
744 : #define for_each_bio(_bio) \
745 : for (; _bio; _bio = _bio->bi_next)
746 :
747 : int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
748 : const struct attribute_group **groups);
749 : static inline int __must_check add_disk(struct gendisk *disk)
750 : {
751 : return device_add_disk(NULL, disk, NULL);
752 : }
753 : void del_gendisk(struct gendisk *gp);
754 : void invalidate_disk(struct gendisk *disk);
755 : void set_disk_ro(struct gendisk *disk, bool read_only);
756 : void disk_uevent(struct gendisk *disk, enum kobject_action action);
757 :
758 : static inline int get_disk_ro(struct gendisk *disk)
759 : {
760 0 : return disk->part0->bd_read_only ||
761 0 : test_bit(GD_READ_ONLY, &disk->state);
762 : }
763 :
764 : static inline int bdev_read_only(struct block_device *bdev)
765 : {
766 0 : return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
767 : }
768 :
769 : bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
770 : bool disk_force_media_change(struct gendisk *disk, unsigned int events);
771 :
772 : void add_disk_randomness(struct gendisk *disk) __latent_entropy;
773 : void rand_initialize_disk(struct gendisk *disk);
774 :
775 : static inline sector_t get_start_sect(struct block_device *bdev)
776 : {
777 : return bdev->bd_start_sect;
778 : }
779 :
780 : static inline sector_t bdev_nr_sectors(struct block_device *bdev)
781 : {
782 : return bdev->bd_nr_sectors;
783 : }
784 :
785 : static inline loff_t bdev_nr_bytes(struct block_device *bdev)
786 : {
787 0 : return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
788 : }
789 :
790 : static inline sector_t get_capacity(struct gendisk *disk)
791 : {
792 0 : return bdev_nr_sectors(disk->part0);
793 : }
794 :
795 : static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
796 : {
797 : return bdev_nr_sectors(sb->s_bdev) >>
798 : (sb->s_blocksize_bits - SECTOR_SHIFT);
799 : }
800 :
801 : int bdev_disk_changed(struct gendisk *disk, bool invalidate);
802 :
803 : struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
804 : struct lock_class_key *lkclass);
805 : void put_disk(struct gendisk *disk);
806 : struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
807 :
808 : /**
809 : * blk_alloc_disk - allocate a gendisk structure
810 : * @node_id: numa node to allocate on
811 : *
812 : * Allocate and pre-initialize a gendisk structure for use with BIO based
813 : * drivers.
814 : *
815 : * Context: can sleep
816 : */
817 : #define blk_alloc_disk(node_id) \
818 : ({ \
819 : static struct lock_class_key __key; \
820 : \
821 : __blk_alloc_disk(node_id, &__key); \
822 : })
823 : void blk_cleanup_disk(struct gendisk *disk);
824 :
825 : int __register_blkdev(unsigned int major, const char *name,
826 : void (*probe)(dev_t devt));
827 : #define register_blkdev(major, name) \
828 : __register_blkdev(major, name, NULL)
829 : void unregister_blkdev(unsigned int major, const char *name);
830 :
831 : bool bdev_check_media_change(struct block_device *bdev);
832 : int __invalidate_device(struct block_device *bdev, bool kill_dirty);
833 : void set_capacity(struct gendisk *disk, sector_t size);
834 :
835 : #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
836 : int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
837 : void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
838 : int bd_register_pending_holders(struct gendisk *disk);
839 : #else
840 : static inline int bd_link_disk_holder(struct block_device *bdev,
841 : struct gendisk *disk)
842 : {
843 : return 0;
844 : }
845 : static inline void bd_unlink_disk_holder(struct block_device *bdev,
846 : struct gendisk *disk)
847 : {
848 : }
849 : static inline int bd_register_pending_holders(struct gendisk *disk)
850 : {
851 : return 0;
852 : }
853 : #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
854 :
855 : dev_t part_devt(struct gendisk *disk, u8 partno);
856 : void inc_diskseq(struct gendisk *disk);
857 : dev_t blk_lookup_devt(const char *name, int partno);
858 : void blk_request_module(dev_t devt);
859 :
860 : extern int blk_register_queue(struct gendisk *disk);
861 : extern void blk_unregister_queue(struct gendisk *disk);
862 : void submit_bio_noacct(struct bio *bio);
863 :
864 : extern int blk_lld_busy(struct request_queue *q);
865 : extern void blk_queue_split(struct bio **);
866 : extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
867 : extern void blk_queue_exit(struct request_queue *q);
868 : extern void blk_sync_queue(struct request_queue *q);
869 :
870 : /* Helper to convert REQ_OP_XXX to its string format XXX */
871 : extern const char *blk_op_str(unsigned int op);
872 :
873 : int blk_status_to_errno(blk_status_t status);
874 : blk_status_t errno_to_blk_status(int errno);
875 :
876 : /* only poll the hardware once, don't continue until a completion was found */
877 : #define BLK_POLL_ONESHOT (1 << 0)
878 : /* do not sleep to wait for the expected completion time */
879 : #define BLK_POLL_NOSLEEP (1 << 1)
880 : int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
881 : int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
882 : unsigned int flags);
883 :
884 : static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
885 : {
886 : return bdev->bd_queue; /* this is never NULL */
887 : }
888 :
889 : #ifdef CONFIG_BLK_DEV_ZONED
890 :
891 : /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
892 : const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
893 :
894 : static inline unsigned int bio_zone_no(struct bio *bio)
895 : {
896 : return blk_queue_zone_no(bdev_get_queue(bio->bi_bdev),
897 : bio->bi_iter.bi_sector);
898 : }
899 :
900 : static inline unsigned int bio_zone_is_seq(struct bio *bio)
901 : {
902 : return blk_queue_zone_is_seq(bdev_get_queue(bio->bi_bdev),
903 : bio->bi_iter.bi_sector);
904 : }
905 : #endif /* CONFIG_BLK_DEV_ZONED */
906 :
907 : static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
908 : int op)
909 : {
910 0 : if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
911 0 : return min(q->limits.max_discard_sectors,
912 : UINT_MAX >> SECTOR_SHIFT);
913 :
914 0 : if (unlikely(op == REQ_OP_WRITE_ZEROES))
915 0 : return q->limits.max_write_zeroes_sectors;
916 :
917 0 : return q->limits.max_sectors;
918 : }
919 :
920 : /*
921 : * Return maximum size of a request at given offset. Only valid for
922 : * file system requests.
923 : */
924 : static inline unsigned int blk_max_size_offset(struct request_queue *q,
925 : sector_t offset,
926 : unsigned int chunk_sectors)
927 : {
928 : if (!chunk_sectors) {
929 0 : if (q->limits.chunk_sectors)
930 : chunk_sectors = q->limits.chunk_sectors;
931 : else
932 0 : return q->limits.max_sectors;
933 : }
934 :
935 0 : if (likely(is_power_of_2(chunk_sectors)))
936 0 : chunk_sectors -= offset & (chunk_sectors - 1);
937 : else
938 0 : chunk_sectors -= sector_div(offset, chunk_sectors);
939 :
940 0 : return min(q->limits.max_sectors, chunk_sectors);
941 : }
942 :
943 : /*
944 : * Access functions for manipulating queue properties
945 : */
946 : extern void blk_cleanup_queue(struct request_queue *);
947 : void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
948 : extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
949 : extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
950 : extern void blk_queue_max_segments(struct request_queue *, unsigned short);
951 : extern void blk_queue_max_discard_segments(struct request_queue *,
952 : unsigned short);
953 : extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
954 : extern void blk_queue_max_discard_sectors(struct request_queue *q,
955 : unsigned int max_discard_sectors);
956 : extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
957 : unsigned int max_write_same_sectors);
958 : extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
959 : extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
960 : unsigned int max_zone_append_sectors);
961 : extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
962 : void blk_queue_zone_write_granularity(struct request_queue *q,
963 : unsigned int size);
964 : extern void blk_queue_alignment_offset(struct request_queue *q,
965 : unsigned int alignment);
966 : void disk_update_readahead(struct gendisk *disk);
967 : extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
968 : extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
969 : extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
970 : extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
971 : extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
972 : extern void blk_set_default_limits(struct queue_limits *lim);
973 : extern void blk_set_stacking_limits(struct queue_limits *lim);
974 : extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
975 : sector_t offset);
976 : extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
977 : sector_t offset);
978 : extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
979 : extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
980 : extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
981 : extern void blk_queue_dma_alignment(struct request_queue *, int);
982 : extern void blk_queue_update_dma_alignment(struct request_queue *, int);
983 : extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
984 : extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
985 :
986 : struct blk_independent_access_ranges *
987 : disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
988 : void disk_set_independent_access_ranges(struct gendisk *disk,
989 : struct blk_independent_access_ranges *iars);
990 :
991 : /*
992 : * Elevator features for blk_queue_required_elevator_features:
993 : */
994 : /* Supports zoned block devices sequential write constraint */
995 : #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
996 : /* Supports scheduling on multiple hardware queues */
997 : #define ELEVATOR_F_MQ_AWARE (1U << 1)
998 :
999 : extern void blk_queue_required_elevator_features(struct request_queue *q,
1000 : unsigned int features);
1001 : extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
1002 : struct device *dev);
1003 :
1004 : bool __must_check blk_get_queue(struct request_queue *);
1005 : extern void blk_put_queue(struct request_queue *);
1006 :
1007 : void blk_mark_disk_dead(struct gendisk *disk);
1008 :
1009 : #ifdef CONFIG_BLOCK
1010 : /*
1011 : * blk_plug permits building a queue of related requests by holding the I/O
1012 : * fragments for a short period. This allows merging of sequential requests
1013 : * into single larger request. As the requests are moved from a per-task list to
1014 : * the device's request_queue in a batch, this results in improved scalability
1015 : * as the lock contention for request_queue lock is reduced.
1016 : *
1017 : * It is ok not to disable preemption when adding the request to the plug list
1018 : * or when attempting a merge. For details, please see schedule() where
1019 : * blk_flush_plug() is called.
1020 : */
1021 : struct blk_plug {
1022 : struct request *mq_list; /* blk-mq requests */
1023 :
1024 : /* if ios_left is > 1, we can batch tag/rq allocations */
1025 : struct request *cached_rq;
1026 : unsigned short nr_ios;
1027 :
1028 : unsigned short rq_count;
1029 :
1030 : bool multiple_queues;
1031 : bool has_elevator;
1032 : bool nowait;
1033 :
1034 : struct list_head cb_list; /* md requires an unplug callback */
1035 : };
1036 :
1037 : struct blk_plug_cb;
1038 : typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1039 : struct blk_plug_cb {
1040 : struct list_head list;
1041 : blk_plug_cb_fn callback;
1042 : void *data;
1043 : };
1044 : extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1045 : void *data, int size);
1046 : extern void blk_start_plug(struct blk_plug *);
1047 : extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1048 : extern void blk_finish_plug(struct blk_plug *);
1049 :
1050 : void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1051 : static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1052 : {
1053 522 : if (plug)
1054 0 : __blk_flush_plug(plug, async);
1055 : }
1056 :
1057 : int blkdev_issue_flush(struct block_device *bdev);
1058 : long nr_blockdev_pages(void);
1059 : #else /* CONFIG_BLOCK */
1060 : struct blk_plug {
1061 : };
1062 :
1063 : static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1064 : unsigned short nr_ios)
1065 : {
1066 : }
1067 :
1068 : static inline void blk_start_plug(struct blk_plug *plug)
1069 : {
1070 : }
1071 :
1072 : static inline void blk_finish_plug(struct blk_plug *plug)
1073 : {
1074 : }
1075 :
1076 : static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1077 : {
1078 : }
1079 :
1080 : static inline int blkdev_issue_flush(struct block_device *bdev)
1081 : {
1082 : return 0;
1083 : }
1084 :
1085 : static inline long nr_blockdev_pages(void)
1086 : {
1087 : return 0;
1088 : }
1089 : #endif /* CONFIG_BLOCK */
1090 :
1091 : extern void blk_io_schedule(void);
1092 :
1093 : #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1094 :
1095 : extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1096 : sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1097 : extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1098 : sector_t nr_sects, gfp_t gfp_mask, int flags,
1099 : struct bio **biop);
1100 :
1101 : #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1102 : #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1103 :
1104 : extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1105 : sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1106 : unsigned flags);
1107 : extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1108 : sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1109 :
1110 : static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1111 : sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1112 : {
1113 : return blkdev_issue_discard(sb->s_bdev,
1114 : block << (sb->s_blocksize_bits -
1115 : SECTOR_SHIFT),
1116 : nr_blocks << (sb->s_blocksize_bits -
1117 : SECTOR_SHIFT),
1118 : gfp_mask, flags);
1119 : }
1120 : static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1121 : sector_t nr_blocks, gfp_t gfp_mask)
1122 : {
1123 : return blkdev_issue_zeroout(sb->s_bdev,
1124 : block << (sb->s_blocksize_bits -
1125 : SECTOR_SHIFT),
1126 : nr_blocks << (sb->s_blocksize_bits -
1127 : SECTOR_SHIFT),
1128 : gfp_mask, 0);
1129 : }
1130 :
1131 : static inline bool bdev_is_partition(struct block_device *bdev)
1132 : {
1133 : return bdev->bd_partno;
1134 : }
1135 :
1136 : enum blk_default_limits {
1137 : BLK_MAX_SEGMENTS = 128,
1138 : BLK_SAFE_MAX_SECTORS = 255,
1139 : BLK_DEF_MAX_SECTORS = 2560,
1140 : BLK_MAX_SEGMENT_SIZE = 65536,
1141 : BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1142 : };
1143 :
1144 : static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1145 : {
1146 0 : return q->limits.seg_boundary_mask;
1147 : }
1148 :
1149 : static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1150 : {
1151 0 : return q->limits.virt_boundary_mask;
1152 : }
1153 :
1154 : static inline unsigned int queue_max_sectors(const struct request_queue *q)
1155 : {
1156 0 : return q->limits.max_sectors;
1157 : }
1158 :
1159 : static inline unsigned int queue_max_bytes(struct request_queue *q)
1160 : {
1161 : return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1162 : }
1163 :
1164 : static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1165 : {
1166 0 : return q->limits.max_hw_sectors;
1167 : }
1168 :
1169 : static inline unsigned short queue_max_segments(const struct request_queue *q)
1170 : {
1171 0 : return q->limits.max_segments;
1172 : }
1173 :
1174 : static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1175 : {
1176 0 : return q->limits.max_discard_segments;
1177 : }
1178 :
1179 : static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1180 : {
1181 0 : return q->limits.max_segment_size;
1182 : }
1183 :
1184 : static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1185 : {
1186 :
1187 0 : const struct queue_limits *l = &q->limits;
1188 :
1189 0 : return min(l->max_zone_append_sectors, l->max_sectors);
1190 : }
1191 :
1192 : static inline unsigned queue_logical_block_size(const struct request_queue *q)
1193 : {
1194 0 : int retval = 512;
1195 :
1196 0 : if (q && q->limits.logical_block_size)
1197 0 : retval = q->limits.logical_block_size;
1198 :
1199 0 : return retval;
1200 : }
1201 :
1202 : static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1203 : {
1204 0 : return queue_logical_block_size(bdev_get_queue(bdev));
1205 : }
1206 :
1207 : static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1208 : {
1209 0 : return q->limits.physical_block_size;
1210 : }
1211 :
1212 : static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1213 : {
1214 0 : return queue_physical_block_size(bdev_get_queue(bdev));
1215 : }
1216 :
1217 : static inline unsigned int queue_io_min(const struct request_queue *q)
1218 : {
1219 0 : return q->limits.io_min;
1220 : }
1221 :
1222 : static inline int bdev_io_min(struct block_device *bdev)
1223 : {
1224 0 : return queue_io_min(bdev_get_queue(bdev));
1225 : }
1226 :
1227 : static inline unsigned int queue_io_opt(const struct request_queue *q)
1228 : {
1229 0 : return q->limits.io_opt;
1230 : }
1231 :
1232 : static inline int bdev_io_opt(struct block_device *bdev)
1233 : {
1234 0 : return queue_io_opt(bdev_get_queue(bdev));
1235 : }
1236 :
1237 : static inline unsigned int
1238 : queue_zone_write_granularity(const struct request_queue *q)
1239 : {
1240 0 : return q->limits.zone_write_granularity;
1241 : }
1242 :
1243 : static inline unsigned int
1244 : bdev_zone_write_granularity(struct block_device *bdev)
1245 : {
1246 : return queue_zone_write_granularity(bdev_get_queue(bdev));
1247 : }
1248 :
1249 : static inline int queue_alignment_offset(const struct request_queue *q)
1250 : {
1251 0 : if (q->limits.misaligned)
1252 : return -1;
1253 :
1254 0 : return q->limits.alignment_offset;
1255 : }
1256 :
1257 : static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1258 : {
1259 0 : unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1260 0 : unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1261 : << SECTOR_SHIFT;
1262 :
1263 0 : return (granularity + lim->alignment_offset - alignment) % granularity;
1264 : }
1265 :
1266 0 : static inline int bdev_alignment_offset(struct block_device *bdev)
1267 : {
1268 0 : struct request_queue *q = bdev_get_queue(bdev);
1269 :
1270 0 : if (q->limits.misaligned)
1271 : return -1;
1272 0 : if (bdev_is_partition(bdev))
1273 0 : return queue_limit_alignment_offset(&q->limits,
1274 : bdev->bd_start_sect);
1275 0 : return q->limits.alignment_offset;
1276 : }
1277 :
1278 : static inline int queue_discard_alignment(const struct request_queue *q)
1279 : {
1280 0 : if (q->limits.discard_misaligned)
1281 : return -1;
1282 :
1283 0 : return q->limits.discard_alignment;
1284 : }
1285 :
1286 : static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1287 : {
1288 : unsigned int alignment, granularity, offset;
1289 :
1290 0 : if (!lim->max_discard_sectors)
1291 : return 0;
1292 :
1293 : /* Why are these in bytes, not sectors? */
1294 0 : alignment = lim->discard_alignment >> SECTOR_SHIFT;
1295 0 : granularity = lim->discard_granularity >> SECTOR_SHIFT;
1296 0 : if (!granularity)
1297 : return 0;
1298 :
1299 : /* Offset of the partition start in 'granularity' sectors */
1300 0 : offset = sector_div(sector, granularity);
1301 :
1302 : /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1303 0 : offset = (granularity + alignment - offset) % granularity;
1304 :
1305 : /* Turn it back into bytes, gaah */
1306 0 : return offset << SECTOR_SHIFT;
1307 : }
1308 :
1309 : static inline int bdev_discard_alignment(struct block_device *bdev)
1310 : {
1311 : struct request_queue *q = bdev_get_queue(bdev);
1312 :
1313 : if (bdev_is_partition(bdev))
1314 : return queue_limit_discard_alignment(&q->limits,
1315 : bdev->bd_start_sect);
1316 : return q->limits.discard_alignment;
1317 : }
1318 :
1319 : static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1320 : {
1321 0 : struct request_queue *q = bdev_get_queue(bdev);
1322 :
1323 0 : if (q)
1324 0 : return q->limits.max_write_zeroes_sectors;
1325 :
1326 : return 0;
1327 : }
1328 :
1329 : static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1330 : {
1331 : struct request_queue *q = bdev_get_queue(bdev);
1332 :
1333 : if (q)
1334 : return blk_queue_zoned_model(q);
1335 :
1336 : return BLK_ZONED_NONE;
1337 : }
1338 :
1339 : static inline bool bdev_is_zoned(struct block_device *bdev)
1340 : {
1341 : struct request_queue *q = bdev_get_queue(bdev);
1342 :
1343 : if (q)
1344 : return blk_queue_is_zoned(q);
1345 :
1346 : return false;
1347 : }
1348 :
1349 : static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1350 : {
1351 0 : struct request_queue *q = bdev_get_queue(bdev);
1352 :
1353 : if (q)
1354 : return blk_queue_zone_sectors(q);
1355 : return 0;
1356 : }
1357 :
1358 : static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
1359 : {
1360 : struct request_queue *q = bdev_get_queue(bdev);
1361 :
1362 : if (q)
1363 : return queue_max_open_zones(q);
1364 : return 0;
1365 : }
1366 :
1367 : static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
1368 : {
1369 : struct request_queue *q = bdev_get_queue(bdev);
1370 :
1371 : if (q)
1372 : return queue_max_active_zones(q);
1373 : return 0;
1374 : }
1375 :
1376 : static inline int queue_dma_alignment(const struct request_queue *q)
1377 : {
1378 0 : return q ? q->dma_alignment : 511;
1379 : }
1380 :
1381 : static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1382 : unsigned int len)
1383 : {
1384 0 : unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1385 0 : return !(addr & alignment) && !(len & alignment);
1386 : }
1387 :
1388 : /* assumes size > 256 */
1389 : static inline unsigned int blksize_bits(unsigned int size)
1390 : {
1391 0 : unsigned int bits = 8;
1392 : do {
1393 0 : bits++;
1394 0 : size >>= 1;
1395 0 : } while (size > 256);
1396 : return bits;
1397 : }
1398 :
1399 : static inline unsigned int block_size(struct block_device *bdev)
1400 : {
1401 0 : return 1 << bdev->bd_inode->i_blkbits;
1402 : }
1403 :
1404 : int kblockd_schedule_work(struct work_struct *work);
1405 : int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1406 :
1407 : #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1408 : MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1409 : #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1410 : MODULE_ALIAS("block-major-" __stringify(major) "-*")
1411 :
1412 : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1413 :
1414 : bool blk_crypto_register(struct blk_crypto_profile *profile,
1415 : struct request_queue *q);
1416 :
1417 : #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1418 :
1419 : static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1420 : struct request_queue *q)
1421 : {
1422 : return true;
1423 : }
1424 :
1425 : #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1426 :
1427 : enum blk_unique_id {
1428 : /* these match the Designator Types specified in SPC */
1429 : BLK_UID_T10 = 1,
1430 : BLK_UID_EUI64 = 2,
1431 : BLK_UID_NAA = 3,
1432 : };
1433 :
1434 : #define NFL4_UFLG_MASK 0x0000003F
1435 :
1436 : struct block_device_operations {
1437 : void (*submit_bio)(struct bio *bio);
1438 : int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1439 : unsigned int flags);
1440 : int (*open) (struct block_device *, fmode_t);
1441 : void (*release) (struct gendisk *, fmode_t);
1442 : int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1443 : int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1444 : int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1445 : unsigned int (*check_events) (struct gendisk *disk,
1446 : unsigned int clearing);
1447 : void (*unlock_native_capacity) (struct gendisk *);
1448 : int (*getgeo)(struct block_device *, struct hd_geometry *);
1449 : int (*set_read_only)(struct block_device *bdev, bool ro);
1450 : void (*free_disk)(struct gendisk *disk);
1451 : /* this callback is with swap_lock and sometimes page table lock held */
1452 : void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1453 : int (*report_zones)(struct gendisk *, sector_t sector,
1454 : unsigned int nr_zones, report_zones_cb cb, void *data);
1455 : char *(*devnode)(struct gendisk *disk, umode_t *mode);
1456 : /* returns the length of the identifier or a negative errno: */
1457 : int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1458 : enum blk_unique_id id_type);
1459 : struct module *owner;
1460 : const struct pr_ops *pr_ops;
1461 :
1462 : /*
1463 : * Special callback for probing GPT entry at a given sector.
1464 : * Needed by Android devices, used by GPT scanner and MMC blk
1465 : * driver.
1466 : */
1467 : int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1468 : };
1469 :
1470 : #ifdef CONFIG_COMPAT
1471 : extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1472 : unsigned int, unsigned long);
1473 : #else
1474 : #define blkdev_compat_ptr_ioctl NULL
1475 : #endif
1476 :
1477 : extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1478 : extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1479 : struct writeback_control *);
1480 :
1481 : static inline void blk_wake_io_task(struct task_struct *waiter)
1482 : {
1483 : /*
1484 : * If we're polling, the task itself is doing the completions. For
1485 : * that case, we don't need to signal a wakeup, it's enough to just
1486 : * mark us as RUNNING.
1487 : */
1488 0 : if (waiter == current)
1489 0 : __set_current_state(TASK_RUNNING);
1490 : else
1491 0 : wake_up_process(waiter);
1492 : }
1493 :
1494 : unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
1495 : unsigned int op);
1496 : void disk_end_io_acct(struct gendisk *disk, unsigned int op,
1497 : unsigned long start_time);
1498 :
1499 : void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
1500 : unsigned long bio_start_io_acct(struct bio *bio);
1501 : void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1502 : struct block_device *orig_bdev);
1503 :
1504 : /**
1505 : * bio_end_io_acct - end I/O accounting for bio based drivers
1506 : * @bio: bio to end account for
1507 : * @start_time: start time returned by bio_start_io_acct()
1508 : */
1509 : static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1510 : {
1511 : return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1512 : }
1513 :
1514 : int bdev_read_only(struct block_device *bdev);
1515 : int set_blocksize(struct block_device *bdev, int size);
1516 :
1517 : const char *bdevname(struct block_device *bdev, char *buffer);
1518 : int lookup_bdev(const char *pathname, dev_t *dev);
1519 :
1520 : void blkdev_show(struct seq_file *seqf, off_t offset);
1521 :
1522 : #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1523 : #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1524 : #ifdef CONFIG_BLOCK
1525 : #define BLKDEV_MAJOR_MAX 512
1526 : #else
1527 : #define BLKDEV_MAJOR_MAX 0
1528 : #endif
1529 :
1530 : struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1531 : void *holder);
1532 : struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1533 : int bd_prepare_to_claim(struct block_device *bdev, void *holder);
1534 : void bd_abort_claiming(struct block_device *bdev, void *holder);
1535 : void blkdev_put(struct block_device *bdev, fmode_t mode);
1536 :
1537 : /* just for blk-cgroup, don't use elsewhere */
1538 : struct block_device *blkdev_get_no_open(dev_t dev);
1539 : void blkdev_put_no_open(struct block_device *bdev);
1540 :
1541 : struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
1542 : void bdev_add(struct block_device *bdev, dev_t dev);
1543 : struct block_device *I_BDEV(struct inode *inode);
1544 : int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
1545 : loff_t lend);
1546 :
1547 : #ifdef CONFIG_BLOCK
1548 : void invalidate_bdev(struct block_device *bdev);
1549 : int sync_blockdev(struct block_device *bdev);
1550 : int sync_blockdev_nowait(struct block_device *bdev);
1551 : void sync_bdevs(bool wait);
1552 : void printk_all_partitions(void);
1553 : #else
1554 : static inline void invalidate_bdev(struct block_device *bdev)
1555 : {
1556 : }
1557 : static inline int sync_blockdev(struct block_device *bdev)
1558 : {
1559 : return 0;
1560 : }
1561 : static inline int sync_blockdev_nowait(struct block_device *bdev)
1562 : {
1563 : return 0;
1564 : }
1565 : static inline void sync_bdevs(bool wait)
1566 : {
1567 : }
1568 : static inline void printk_all_partitions(void)
1569 : {
1570 : }
1571 : #endif /* CONFIG_BLOCK */
1572 :
1573 : int fsync_bdev(struct block_device *bdev);
1574 :
1575 : int freeze_bdev(struct block_device *bdev);
1576 : int thaw_bdev(struct block_device *bdev);
1577 :
1578 : struct io_comp_batch {
1579 : struct request *req_list;
1580 : bool need_ts;
1581 : void (*complete)(struct io_comp_batch *);
1582 : };
1583 :
1584 : #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1585 :
1586 : #endif /* _LINUX_BLKDEV_H */
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