blkdev.h 58 KB

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