| 1 | #ifndef _LINUX_BLKDEV_H |
| 2 | #define _LINUX_BLKDEV_H |
| 3 | |
| 4 | #include <linux/sched.h> |
| 5 | |
| 6 | #ifdef CONFIG_BLOCK |
| 7 | |
| 8 | #include <linux/major.h> |
| 9 | #include <linux/genhd.h> |
| 10 | #include <linux/list.h> |
| 11 | #include <linux/llist.h> |
| 12 | #include <linux/timer.h> |
| 13 | #include <linux/workqueue.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/backing-dev-defs.h> |
| 16 | #include <linux/wait.h> |
| 17 | #include <linux/mempool.h> |
| 18 | #include <linux/pfn.h> |
| 19 | #include <linux/bio.h> |
| 20 | #include <linux/stringify.h> |
| 21 | #include <linux/gfp.h> |
| 22 | #include <linux/bsg.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/rcupdate.h> |
| 25 | #include <linux/percpu-refcount.h> |
| 26 | #include <linux/scatterlist.h> |
| 27 | |
| 28 | struct module; |
| 29 | struct scsi_ioctl_command; |
| 30 | |
| 31 | struct request_queue; |
| 32 | struct elevator_queue; |
| 33 | struct blk_trace; |
| 34 | struct request; |
| 35 | struct sg_io_hdr; |
| 36 | struct bsg_job; |
| 37 | struct blkcg_gq; |
| 38 | struct blk_flush_queue; |
| 39 | struct pr_ops; |
| 40 | |
| 41 | #define BLKDEV_MIN_RQ 4 |
| 42 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| 43 | |
| 44 | /* |
| 45 | * Maximum number of blkcg policies allowed to be registered concurrently. |
| 46 | * Defined here to simplify include dependency. |
| 47 | */ |
| 48 | #define BLKCG_MAX_POLS 2 |
| 49 | |
| 50 | struct request; |
| 51 | typedef void (rq_end_io_fn)(struct request *, int); |
| 52 | |
| 53 | #define BLK_RL_SYNCFULL (1U << 0) |
| 54 | #define BLK_RL_ASYNCFULL (1U << 1) |
| 55 | |
| 56 | struct request_list { |
| 57 | struct request_queue *q; /* the queue this rl belongs to */ |
| 58 | #ifdef CONFIG_BLK_CGROUP |
| 59 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ |
| 60 | #endif |
| 61 | /* |
| 62 | * count[], starved[], and wait[] are indexed by |
| 63 | * BLK_RW_SYNC/BLK_RW_ASYNC |
| 64 | */ |
| 65 | int count[2]; |
| 66 | int starved[2]; |
| 67 | mempool_t *rq_pool; |
| 68 | wait_queue_head_t wait[2]; |
| 69 | unsigned int flags; |
| 70 | }; |
| 71 | |
| 72 | /* |
| 73 | * request command types |
| 74 | */ |
| 75 | enum rq_cmd_type_bits { |
| 76 | REQ_TYPE_FS = 1, /* fs request */ |
| 77 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
| 78 | REQ_TYPE_DRV_PRIV, /* driver defined types from here */ |
| 79 | }; |
| 80 | |
| 81 | #define BLK_MAX_CDB 16 |
| 82 | |
| 83 | /* |
| 84 | * Try to put the fields that are referenced together in the same cacheline. |
| 85 | * |
| 86 | * If you modify this structure, make sure to update blk_rq_init() and |
| 87 | * especially blk_mq_rq_ctx_init() to take care of the added fields. |
| 88 | */ |
| 89 | struct request { |
| 90 | struct list_head queuelist; |
| 91 | union { |
| 92 | struct call_single_data csd; |
| 93 | unsigned long fifo_time; |
| 94 | }; |
| 95 | |
| 96 | struct request_queue *q; |
| 97 | struct blk_mq_ctx *mq_ctx; |
| 98 | |
| 99 | u64 cmd_flags; |
| 100 | unsigned cmd_type; |
| 101 | unsigned long atomic_flags; |
| 102 | |
| 103 | int cpu; |
| 104 | |
| 105 | /* the following two fields are internal, NEVER access directly */ |
| 106 | unsigned int __data_len; /* total data len */ |
| 107 | sector_t __sector; /* sector cursor */ |
| 108 | |
| 109 | struct bio *bio; |
| 110 | struct bio *biotail; |
| 111 | |
| 112 | /* |
| 113 | * The hash is used inside the scheduler, and killed once the |
| 114 | * request reaches the dispatch list. The ipi_list is only used |
| 115 | * to queue the request for softirq completion, which is long |
| 116 | * after the request has been unhashed (and even removed from |
| 117 | * the dispatch list). |
| 118 | */ |
| 119 | union { |
| 120 | struct hlist_node hash; /* merge hash */ |
| 121 | struct list_head ipi_list; |
| 122 | }; |
| 123 | |
| 124 | /* |
| 125 | * The rb_node is only used inside the io scheduler, requests |
| 126 | * are pruned when moved to the dispatch queue. So let the |
| 127 | * completion_data share space with the rb_node. |
| 128 | */ |
| 129 | union { |
| 130 | struct rb_node rb_node; /* sort/lookup */ |
| 131 | void *completion_data; |
| 132 | }; |
| 133 | |
| 134 | /* |
| 135 | * Three pointers are available for the IO schedulers, if they need |
| 136 | * more they have to dynamically allocate it. Flush requests are |
| 137 | * never put on the IO scheduler. So let the flush fields share |
| 138 | * space with the elevator data. |
| 139 | */ |
| 140 | union { |
| 141 | struct { |
| 142 | struct io_cq *icq; |
| 143 | void *priv[2]; |
| 144 | } elv; |
| 145 | |
| 146 | struct { |
| 147 | unsigned int seq; |
| 148 | struct list_head list; |
| 149 | rq_end_io_fn *saved_end_io; |
| 150 | } flush; |
| 151 | }; |
| 152 | |
| 153 | struct gendisk *rq_disk; |
| 154 | struct hd_struct *part; |
| 155 | unsigned long start_time; |
| 156 | #ifdef CONFIG_BLK_CGROUP |
| 157 | struct request_list *rl; /* rl this rq is alloced from */ |
| 158 | unsigned long long start_time_ns; |
| 159 | unsigned long long io_start_time_ns; /* when passed to hardware */ |
| 160 | #endif |
| 161 | /* Number of scatter-gather DMA addr+len pairs after |
| 162 | * physical address coalescing is performed. |
| 163 | */ |
| 164 | unsigned short nr_phys_segments; |
| 165 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 166 | unsigned short nr_integrity_segments; |
| 167 | #endif |
| 168 | |
| 169 | unsigned short ioprio; |
| 170 | |
| 171 | void *special; /* opaque pointer available for LLD use */ |
| 172 | |
| 173 | int tag; |
| 174 | int errors; |
| 175 | |
| 176 | /* |
| 177 | * when request is used as a packet command carrier |
| 178 | */ |
| 179 | unsigned char __cmd[BLK_MAX_CDB]; |
| 180 | unsigned char *cmd; |
| 181 | unsigned short cmd_len; |
| 182 | |
| 183 | unsigned int extra_len; /* length of alignment and padding */ |
| 184 | unsigned int sense_len; |
| 185 | unsigned int resid_len; /* residual count */ |
| 186 | void *sense; |
| 187 | |
| 188 | unsigned long deadline; |
| 189 | struct list_head timeout_list; |
| 190 | unsigned int timeout; |
| 191 | int retries; |
| 192 | |
| 193 | /* |
| 194 | * completion callback. |
| 195 | */ |
| 196 | rq_end_io_fn *end_io; |
| 197 | void *end_io_data; |
| 198 | |
| 199 | /* for bidi */ |
| 200 | struct request *next_rq; |
| 201 | }; |
| 202 | |
| 203 | #define REQ_OP_SHIFT (8 * sizeof(u64) - REQ_OP_BITS) |
| 204 | #define req_op(req) ((req)->cmd_flags >> REQ_OP_SHIFT) |
| 205 | |
| 206 | #define req_set_op(req, op) do { \ |
| 207 | WARN_ON(op >= (1 << REQ_OP_BITS)); \ |
| 208 | (req)->cmd_flags &= ((1ULL << REQ_OP_SHIFT) - 1); \ |
| 209 | (req)->cmd_flags |= ((u64) (op) << REQ_OP_SHIFT); \ |
| 210 | } while (0) |
| 211 | |
| 212 | #define req_set_op_attrs(req, op, flags) do { \ |
| 213 | req_set_op(req, op); \ |
| 214 | (req)->cmd_flags |= flags; \ |
| 215 | } while (0) |
| 216 | |
| 217 | static inline unsigned short req_get_ioprio(struct request *req) |
| 218 | { |
| 219 | return req->ioprio; |
| 220 | } |
| 221 | |
| 222 | #include <linux/elevator.h> |
| 223 | |
| 224 | struct blk_queue_ctx; |
| 225 | |
| 226 | typedef void (request_fn_proc) (struct request_queue *q); |
| 227 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
| 228 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
| 229 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
| 230 | |
| 231 | struct bio_vec; |
| 232 | typedef void (softirq_done_fn)(struct request *); |
| 233 | typedef int (dma_drain_needed_fn)(struct request *); |
| 234 | typedef int (lld_busy_fn) (struct request_queue *q); |
| 235 | typedef int (bsg_job_fn) (struct bsg_job *); |
| 236 | |
| 237 | enum blk_eh_timer_return { |
| 238 | BLK_EH_NOT_HANDLED, |
| 239 | BLK_EH_HANDLED, |
| 240 | BLK_EH_RESET_TIMER, |
| 241 | }; |
| 242 | |
| 243 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 244 | |
| 245 | enum blk_queue_state { |
| 246 | Queue_down, |
| 247 | Queue_up, |
| 248 | }; |
| 249 | |
| 250 | struct blk_queue_tag { |
| 251 | struct request **tag_index; /* map of busy tags */ |
| 252 | unsigned long *tag_map; /* bit map of free/busy tags */ |
| 253 | int busy; /* current depth */ |
| 254 | int max_depth; /* what we will send to device */ |
| 255 | int real_max_depth; /* what the array can hold */ |
| 256 | atomic_t refcnt; /* map can be shared */ |
| 257 | int alloc_policy; /* tag allocation policy */ |
| 258 | int next_tag; /* next tag */ |
| 259 | }; |
| 260 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
| 261 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ |
| 262 | |
| 263 | #define BLK_SCSI_MAX_CMDS (256) |
| 264 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 265 | |
| 266 | struct queue_limits { |
| 267 | unsigned long bounce_pfn; |
| 268 | unsigned long seg_boundary_mask; |
| 269 | unsigned long virt_boundary_mask; |
| 270 | |
| 271 | unsigned int max_hw_sectors; |
| 272 | unsigned int max_dev_sectors; |
| 273 | unsigned int chunk_sectors; |
| 274 | unsigned int max_sectors; |
| 275 | unsigned int max_segment_size; |
| 276 | unsigned int physical_block_size; |
| 277 | unsigned int alignment_offset; |
| 278 | unsigned int io_min; |
| 279 | unsigned int io_opt; |
| 280 | unsigned int max_discard_sectors; |
| 281 | unsigned int max_hw_discard_sectors; |
| 282 | unsigned int max_write_same_sectors; |
| 283 | unsigned int discard_granularity; |
| 284 | unsigned int discard_alignment; |
| 285 | |
| 286 | unsigned short logical_block_size; |
| 287 | unsigned short max_segments; |
| 288 | unsigned short max_integrity_segments; |
| 289 | |
| 290 | unsigned char misaligned; |
| 291 | unsigned char discard_misaligned; |
| 292 | unsigned char cluster; |
| 293 | unsigned char discard_zeroes_data; |
| 294 | unsigned char raid_partial_stripes_expensive; |
| 295 | }; |
| 296 | |
| 297 | struct request_queue { |
| 298 | /* |
| 299 | * Together with queue_head for cacheline sharing |
| 300 | */ |
| 301 | struct list_head queue_head; |
| 302 | struct request *last_merge; |
| 303 | struct elevator_queue *elevator; |
| 304 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
| 305 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ |
| 306 | |
| 307 | /* |
| 308 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
| 309 | * is used, root blkg allocates from @q->root_rl and all other |
| 310 | * blkgs from their own blkg->rl. Which one to use should be |
| 311 | * determined using bio_request_list(). |
| 312 | */ |
| 313 | struct request_list root_rl; |
| 314 | |
| 315 | request_fn_proc *request_fn; |
| 316 | make_request_fn *make_request_fn; |
| 317 | prep_rq_fn *prep_rq_fn; |
| 318 | unprep_rq_fn *unprep_rq_fn; |
| 319 | softirq_done_fn *softirq_done_fn; |
| 320 | rq_timed_out_fn *rq_timed_out_fn; |
| 321 | dma_drain_needed_fn *dma_drain_needed; |
| 322 | lld_busy_fn *lld_busy_fn; |
| 323 | |
| 324 | struct blk_mq_ops *mq_ops; |
| 325 | |
| 326 | unsigned int *mq_map; |
| 327 | |
| 328 | /* sw queues */ |
| 329 | struct blk_mq_ctx __percpu *queue_ctx; |
| 330 | unsigned int nr_queues; |
| 331 | |
| 332 | /* hw dispatch queues */ |
| 333 | struct blk_mq_hw_ctx **queue_hw_ctx; |
| 334 | unsigned int nr_hw_queues; |
| 335 | |
| 336 | /* |
| 337 | * Dispatch queue sorting |
| 338 | */ |
| 339 | sector_t end_sector; |
| 340 | struct request *boundary_rq; |
| 341 | |
| 342 | /* |
| 343 | * Delayed queue handling |
| 344 | */ |
| 345 | struct delayed_work delay_work; |
| 346 | |
| 347 | struct backing_dev_info backing_dev_info; |
| 348 | |
| 349 | /* |
| 350 | * The queue owner gets to use this for whatever they like. |
| 351 | * ll_rw_blk doesn't touch it. |
| 352 | */ |
| 353 | void *queuedata; |
| 354 | |
| 355 | /* |
| 356 | * various queue flags, see QUEUE_* below |
| 357 | */ |
| 358 | unsigned long queue_flags; |
| 359 | |
| 360 | /* |
| 361 | * ida allocated id for this queue. Used to index queues from |
| 362 | * ioctx. |
| 363 | */ |
| 364 | int id; |
| 365 | |
| 366 | /* |
| 367 | * queue needs bounce pages for pages above this limit |
| 368 | */ |
| 369 | gfp_t bounce_gfp; |
| 370 | |
| 371 | /* |
| 372 | * protects queue structures from reentrancy. ->__queue_lock should |
| 373 | * _never_ be used directly, it is queue private. always use |
| 374 | * ->queue_lock. |
| 375 | */ |
| 376 | spinlock_t __queue_lock; |
| 377 | spinlock_t *queue_lock; |
| 378 | |
| 379 | /* |
| 380 | * queue kobject |
| 381 | */ |
| 382 | struct kobject kobj; |
| 383 | |
| 384 | /* |
| 385 | * mq queue kobject |
| 386 | */ |
| 387 | struct kobject mq_kobj; |
| 388 | |
| 389 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
| 390 | struct blk_integrity integrity; |
| 391 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 392 | |
| 393 | #ifdef CONFIG_PM |
| 394 | struct device *dev; |
| 395 | int rpm_status; |
| 396 | unsigned int nr_pending; |
| 397 | #endif |
| 398 | |
| 399 | /* |
| 400 | * queue settings |
| 401 | */ |
| 402 | unsigned long nr_requests; /* Max # of requests */ |
| 403 | unsigned int nr_congestion_on; |
| 404 | unsigned int nr_congestion_off; |
| 405 | unsigned int nr_batching; |
| 406 | |
| 407 | unsigned int dma_drain_size; |
| 408 | void *dma_drain_buffer; |
| 409 | unsigned int dma_pad_mask; |
| 410 | unsigned int dma_alignment; |
| 411 | |
| 412 | struct blk_queue_tag *queue_tags; |
| 413 | struct list_head tag_busy_list; |
| 414 | |
| 415 | unsigned int nr_sorted; |
| 416 | unsigned int in_flight[2]; |
| 417 | /* |
| 418 | * Number of active block driver functions for which blk_drain_queue() |
| 419 | * must wait. Must be incremented around functions that unlock the |
| 420 | * queue_lock internally, e.g. scsi_request_fn(). |
| 421 | */ |
| 422 | unsigned int request_fn_active; |
| 423 | |
| 424 | unsigned int rq_timeout; |
| 425 | struct timer_list timeout; |
| 426 | struct work_struct timeout_work; |
| 427 | struct list_head timeout_list; |
| 428 | |
| 429 | struct list_head icq_list; |
| 430 | #ifdef CONFIG_BLK_CGROUP |
| 431 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
| 432 | struct blkcg_gq *root_blkg; |
| 433 | struct list_head blkg_list; |
| 434 | #endif |
| 435 | |
| 436 | struct queue_limits limits; |
| 437 | |
| 438 | /* |
| 439 | * sg stuff |
| 440 | */ |
| 441 | unsigned int sg_timeout; |
| 442 | unsigned int sg_reserved_size; |
| 443 | int node; |
| 444 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
| 445 | struct blk_trace *blk_trace; |
| 446 | #endif |
| 447 | /* |
| 448 | * for flush operations |
| 449 | */ |
| 450 | struct blk_flush_queue *fq; |
| 451 | |
| 452 | struct list_head requeue_list; |
| 453 | spinlock_t requeue_lock; |
| 454 | struct work_struct requeue_work; |
| 455 | |
| 456 | struct mutex sysfs_lock; |
| 457 | |
| 458 | int bypass_depth; |
| 459 | atomic_t mq_freeze_depth; |
| 460 | |
| 461 | #if defined(CONFIG_BLK_DEV_BSG) |
| 462 | bsg_job_fn *bsg_job_fn; |
| 463 | int bsg_job_size; |
| 464 | struct bsg_class_device bsg_dev; |
| 465 | #endif |
| 466 | |
| 467 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 468 | /* Throttle data */ |
| 469 | struct throtl_data *td; |
| 470 | #endif |
| 471 | struct rcu_head rcu_head; |
| 472 | wait_queue_head_t mq_freeze_wq; |
| 473 | struct percpu_ref q_usage_counter; |
| 474 | struct list_head all_q_node; |
| 475 | |
| 476 | struct blk_mq_tag_set *tag_set; |
| 477 | struct list_head tag_set_list; |
| 478 | struct bio_set *bio_split; |
| 479 | |
| 480 | bool mq_sysfs_init_done; |
| 481 | }; |
| 482 | |
| 483 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 484 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
| 485 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
| 486 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
| 487 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
| 488 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
| 489 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
| 490 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ |
| 491 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
| 492 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
| 493 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ |
| 494 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ |
| 495 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
| 496 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
| 497 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ |
| 498 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ |
| 499 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ |
| 500 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ |
| 501 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
| 502 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
| 503 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
| 504 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
| 505 | #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */ |
| 506 | #define QUEUE_FLAG_WC 23 /* Write back caching */ |
| 507 | #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */ |
| 508 | #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */ |
| 509 | |
| 510 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| 511 | (1 << QUEUE_FLAG_STACKABLE) | \ |
| 512 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 513 | (1 << QUEUE_FLAG_ADD_RANDOM)) |
| 514 | |
| 515 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| 516 | (1 << QUEUE_FLAG_STACKABLE) | \ |
| 517 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 518 | (1 << QUEUE_FLAG_POLL)) |
| 519 | |
| 520 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
| 521 | { |
| 522 | if (q->queue_lock) |
| 523 | lockdep_assert_held(q->queue_lock); |
| 524 | } |
| 525 | |
| 526 | static inline void queue_flag_set_unlocked(unsigned int flag, |
| 527 | struct request_queue *q) |
| 528 | { |
| 529 | __set_bit(flag, &q->queue_flags); |
| 530 | } |
| 531 | |
| 532 | static inline int queue_flag_test_and_clear(unsigned int flag, |
| 533 | struct request_queue *q) |
| 534 | { |
| 535 | queue_lockdep_assert_held(q); |
| 536 | |
| 537 | if (test_bit(flag, &q->queue_flags)) { |
| 538 | __clear_bit(flag, &q->queue_flags); |
| 539 | return 1; |
| 540 | } |
| 541 | |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | static inline int queue_flag_test_and_set(unsigned int flag, |
| 546 | struct request_queue *q) |
| 547 | { |
| 548 | queue_lockdep_assert_held(q); |
| 549 | |
| 550 | if (!test_bit(flag, &q->queue_flags)) { |
| 551 | __set_bit(flag, &q->queue_flags); |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | return 1; |
| 556 | } |
| 557 | |
| 558 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
| 559 | { |
| 560 | queue_lockdep_assert_held(q); |
| 561 | __set_bit(flag, &q->queue_flags); |
| 562 | } |
| 563 | |
| 564 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
| 565 | struct request_queue *q) |
| 566 | { |
| 567 | __clear_bit(flag, &q->queue_flags); |
| 568 | } |
| 569 | |
| 570 | static inline int queue_in_flight(struct request_queue *q) |
| 571 | { |
| 572 | return q->in_flight[0] + q->in_flight[1]; |
| 573 | } |
| 574 | |
| 575 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
| 576 | { |
| 577 | queue_lockdep_assert_held(q); |
| 578 | __clear_bit(flag, &q->queue_flags); |
| 579 | } |
| 580 | |
| 581 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
| 582 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
| 583 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
| 584 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
| 585 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
| 586 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
| 587 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
| 588 | #define blk_queue_noxmerges(q) \ |
| 589 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
| 590 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
| 591 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
| 592 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
| 593 | #define blk_queue_stackable(q) \ |
| 594 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
| 595 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
| 596 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
| 597 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) |
| 598 | |
| 599 | #define blk_noretry_request(rq) \ |
| 600 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
| 601 | REQ_FAILFAST_DRIVER)) |
| 602 | |
| 603 | #define blk_account_rq(rq) \ |
| 604 | (((rq)->cmd_flags & REQ_STARTED) && \ |
| 605 | ((rq)->cmd_type == REQ_TYPE_FS)) |
| 606 | |
| 607 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
| 608 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
| 609 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 610 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
| 611 | |
| 612 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 613 | |
| 614 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
| 615 | |
| 616 | /* |
| 617 | * Driver can handle struct request, if it either has an old style |
| 618 | * request_fn defined, or is blk-mq based. |
| 619 | */ |
| 620 | static inline bool queue_is_rq_based(struct request_queue *q) |
| 621 | { |
| 622 | return q->request_fn || q->mq_ops; |
| 623 | } |
| 624 | |
| 625 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
| 626 | { |
| 627 | return q->limits.cluster; |
| 628 | } |
| 629 | |
| 630 | /* |
| 631 | * We regard a request as sync, if either a read or a sync write |
| 632 | */ |
| 633 | static inline bool rw_is_sync(int op, unsigned int rw_flags) |
| 634 | { |
| 635 | return op == REQ_OP_READ || (rw_flags & REQ_SYNC); |
| 636 | } |
| 637 | |
| 638 | static inline bool rq_is_sync(struct request *rq) |
| 639 | { |
| 640 | return rw_is_sync(req_op(rq), rq->cmd_flags); |
| 641 | } |
| 642 | |
| 643 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
| 644 | { |
| 645 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 646 | |
| 647 | return rl->flags & flag; |
| 648 | } |
| 649 | |
| 650 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
| 651 | { |
| 652 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 653 | |
| 654 | rl->flags |= flag; |
| 655 | } |
| 656 | |
| 657 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
| 658 | { |
| 659 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 660 | |
| 661 | rl->flags &= ~flag; |
| 662 | } |
| 663 | |
| 664 | static inline bool rq_mergeable(struct request *rq) |
| 665 | { |
| 666 | if (rq->cmd_type != REQ_TYPE_FS) |
| 667 | return false; |
| 668 | |
| 669 | if (req_op(rq) == REQ_OP_FLUSH) |
| 670 | return false; |
| 671 | |
| 672 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
| 673 | return false; |
| 674 | |
| 675 | return true; |
| 676 | } |
| 677 | |
| 678 | static inline bool blk_check_merge_flags(unsigned int flags1, unsigned int op1, |
| 679 | unsigned int flags2, unsigned int op2) |
| 680 | { |
| 681 | if ((op1 == REQ_OP_DISCARD) != (op2 == REQ_OP_DISCARD)) |
| 682 | return false; |
| 683 | |
| 684 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) |
| 685 | return false; |
| 686 | |
| 687 | if ((op1 == REQ_OP_WRITE_SAME) != (op2 == REQ_OP_WRITE_SAME)) |
| 688 | return false; |
| 689 | |
| 690 | return true; |
| 691 | } |
| 692 | |
| 693 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
| 694 | { |
| 695 | if (bio_data(a) == bio_data(b)) |
| 696 | return true; |
| 697 | |
| 698 | return false; |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * q->prep_rq_fn return values |
| 703 | */ |
| 704 | enum { |
| 705 | BLKPREP_OK, /* serve it */ |
| 706 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ |
| 707 | BLKPREP_DEFER, /* leave on queue */ |
| 708 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ |
| 709 | }; |
| 710 | |
| 711 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 712 | |
| 713 | /* |
| 714 | * standard bounce addresses: |
| 715 | * |
| 716 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 717 | * BLK_BOUNCE_ANY : don't bounce anything |
| 718 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 719 | */ |
| 720 | |
| 721 | #if BITS_PER_LONG == 32 |
| 722 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
| 723 | #else |
| 724 | #define BLK_BOUNCE_HIGH -1ULL |
| 725 | #endif |
| 726 | #define BLK_BOUNCE_ANY (-1ULL) |
| 727 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
| 728 | |
| 729 | /* |
| 730 | * default timeout for SG_IO if none specified |
| 731 | */ |
| 732 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
| 733 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
| 734 | |
| 735 | #ifdef CONFIG_BOUNCE |
| 736 | extern int init_emergency_isa_pool(void); |
| 737 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
| 738 | #else |
| 739 | static inline int init_emergency_isa_pool(void) |
| 740 | { |
| 741 | return 0; |
| 742 | } |
| 743 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
| 744 | { |
| 745 | } |
| 746 | #endif /* CONFIG_MMU */ |
| 747 | |
| 748 | struct rq_map_data { |
| 749 | struct page **pages; |
| 750 | int page_order; |
| 751 | int nr_entries; |
| 752 | unsigned long offset; |
| 753 | int null_mapped; |
| 754 | int from_user; |
| 755 | }; |
| 756 | |
| 757 | struct req_iterator { |
| 758 | struct bvec_iter iter; |
| 759 | struct bio *bio; |
| 760 | }; |
| 761 | |
| 762 | /* This should not be used directly - use rq_for_each_segment */ |
| 763 | #define for_each_bio(_bio) \ |
| 764 | for (; _bio; _bio = _bio->bi_next) |
| 765 | #define __rq_for_each_bio(_bio, rq) \ |
| 766 | if ((rq->bio)) \ |
| 767 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 768 | |
| 769 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 770 | __rq_for_each_bio(_iter.bio, _rq) \ |
| 771 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
| 772 | |
| 773 | #define rq_iter_last(bvec, _iter) \ |
| 774 | (_iter.bio->bi_next == NULL && \ |
| 775 | bio_iter_last(bvec, _iter.iter)) |
| 776 | |
| 777 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 778 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| 779 | #endif |
| 780 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 781 | extern void rq_flush_dcache_pages(struct request *rq); |
| 782 | #else |
| 783 | static inline void rq_flush_dcache_pages(struct request *rq) |
| 784 | { |
| 785 | } |
| 786 | #endif |
| 787 | |
| 788 | #ifdef CONFIG_PRINTK |
| 789 | #define vfs_msg(sb, level, fmt, ...) \ |
| 790 | __vfs_msg(sb, level, fmt, ##__VA_ARGS__) |
| 791 | #else |
| 792 | #define vfs_msg(sb, level, fmt, ...) \ |
| 793 | do { \ |
| 794 | no_printk(fmt, ##__VA_ARGS__); \ |
| 795 | __vfs_msg(sb, "", " "); \ |
| 796 | } while (0) |
| 797 | #endif |
| 798 | |
| 799 | extern int blk_register_queue(struct gendisk *disk); |
| 800 | extern void blk_unregister_queue(struct gendisk *disk); |
| 801 | extern blk_qc_t generic_make_request(struct bio *bio); |
| 802 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
| 803 | extern void blk_put_request(struct request *); |
| 804 | extern void __blk_put_request(struct request_queue *, struct request *); |
| 805 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
| 806 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
| 807 | gfp_t); |
| 808 | extern void blk_rq_set_block_pc(struct request *); |
| 809 | extern void blk_requeue_request(struct request_queue *, struct request *); |
| 810 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
| 811 | int offset, unsigned int len); |
| 812 | extern int blk_lld_busy(struct request_queue *q); |
| 813 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| 814 | struct bio_set *bs, gfp_t gfp_mask, |
| 815 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
| 816 | void *data); |
| 817 | extern void blk_rq_unprep_clone(struct request *rq); |
| 818 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 819 | struct request *rq); |
| 820 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
| 821 | extern void blk_queue_split(struct request_queue *, struct bio **, |
| 822 | struct bio_set *); |
| 823 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
| 824 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
| 825 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
| 826 | unsigned int, void __user *); |
| 827 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 828 | unsigned int, void __user *); |
| 829 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 830 | struct scsi_ioctl_command __user *); |
| 831 | |
| 832 | extern int blk_queue_enter(struct request_queue *q, bool nowait); |
| 833 | extern void blk_queue_exit(struct request_queue *q); |
| 834 | extern void blk_start_queue(struct request_queue *q); |
| 835 | extern void blk_start_queue_async(struct request_queue *q); |
| 836 | extern void blk_stop_queue(struct request_queue *q); |
| 837 | extern void blk_sync_queue(struct request_queue *q); |
| 838 | extern void __blk_stop_queue(struct request_queue *q); |
| 839 | extern void __blk_run_queue(struct request_queue *q); |
| 840 | extern void __blk_run_queue_uncond(struct request_queue *q); |
| 841 | extern void blk_run_queue(struct request_queue *); |
| 842 | extern void blk_run_queue_async(struct request_queue *q); |
| 843 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
| 844 | struct rq_map_data *, void __user *, unsigned long, |
| 845 | gfp_t); |
| 846 | extern int blk_rq_unmap_user(struct bio *); |
| 847 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 848 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
| 849 | struct rq_map_data *, const struct iov_iter *, |
| 850 | gfp_t); |
| 851 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
| 852 | struct request *, int); |
| 853 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
| 854 | struct request *, int, rq_end_io_fn *); |
| 855 | |
| 856 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
| 857 | |
| 858 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
| 859 | { |
| 860 | return bdev->bd_disk->queue; /* this is never NULL */ |
| 861 | } |
| 862 | |
| 863 | /* |
| 864 | * blk_rq_pos() : the current sector |
| 865 | * blk_rq_bytes() : bytes left in the entire request |
| 866 | * blk_rq_cur_bytes() : bytes left in the current segment |
| 867 | * blk_rq_err_bytes() : bytes left till the next error boundary |
| 868 | * blk_rq_sectors() : sectors left in the entire request |
| 869 | * blk_rq_cur_sectors() : sectors left in the current segment |
| 870 | */ |
| 871 | static inline sector_t blk_rq_pos(const struct request *rq) |
| 872 | { |
| 873 | return rq->__sector; |
| 874 | } |
| 875 | |
| 876 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
| 877 | { |
| 878 | return rq->__data_len; |
| 879 | } |
| 880 | |
| 881 | static inline int blk_rq_cur_bytes(const struct request *rq) |
| 882 | { |
| 883 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| 884 | } |
| 885 | |
| 886 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| 887 | |
| 888 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
| 889 | { |
| 890 | return blk_rq_bytes(rq) >> 9; |
| 891 | } |
| 892 | |
| 893 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| 894 | { |
| 895 | return blk_rq_cur_bytes(rq) >> 9; |
| 896 | } |
| 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)) |
| 902 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
| 903 | |
| 904 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
| 905 | return q->limits.max_write_same_sectors; |
| 906 | |
| 907 | return q->limits.max_sectors; |
| 908 | } |
| 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 | { |
| 917 | if (!q->limits.chunk_sectors) |
| 918 | return q->limits.max_sectors; |
| 919 | |
| 920 | return q->limits.chunk_sectors - |
| 921 | (offset & (q->limits.chunk_sectors - 1)); |
| 922 | } |
| 923 | |
| 924 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
| 925 | { |
| 926 | struct request_queue *q = rq->q; |
| 927 | |
| 928 | if (unlikely(rq->cmd_type != REQ_TYPE_FS)) |
| 929 | return q->limits.max_hw_sectors; |
| 930 | |
| 931 | if (!q->limits.chunk_sectors || (req_op(rq) == REQ_OP_DISCARD)) |
| 932 | return blk_queue_get_max_sectors(q, req_op(rq)); |
| 933 | |
| 934 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), |
| 935 | blk_queue_get_max_sectors(q, req_op(rq))); |
| 936 | } |
| 937 | |
| 938 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
| 939 | { |
| 940 | unsigned int nr_bios = 0; |
| 941 | struct bio *bio; |
| 942 | |
| 943 | __rq_for_each_bio(bio, rq) |
| 944 | nr_bios++; |
| 945 | |
| 946 | return nr_bios; |
| 947 | } |
| 948 | |
| 949 | /* |
| 950 | * Request issue related functions. |
| 951 | */ |
| 952 | extern struct request *blk_peek_request(struct request_queue *q); |
| 953 | extern void blk_start_request(struct request *rq); |
| 954 | extern struct request *blk_fetch_request(struct request_queue *q); |
| 955 | |
| 956 | /* |
| 957 | * Request completion related functions. |
| 958 | * |
| 959 | * blk_update_request() completes given number of bytes and updates |
| 960 | * the request without completing it. |
| 961 | * |
| 962 | * blk_end_request() and friends. __blk_end_request() must be called |
| 963 | * with the request queue spinlock acquired. |
| 964 | * |
| 965 | * Several drivers define their own end_request and call |
| 966 | * blk_end_request() for parts of the original function. |
| 967 | * This prevents code duplication in drivers. |
| 968 | */ |
| 969 | extern bool blk_update_request(struct request *rq, int error, |
| 970 | unsigned int nr_bytes); |
| 971 | extern void blk_finish_request(struct request *rq, int error); |
| 972 | extern bool blk_end_request(struct request *rq, int error, |
| 973 | unsigned int nr_bytes); |
| 974 | extern void blk_end_request_all(struct request *rq, int error); |
| 975 | extern bool blk_end_request_cur(struct request *rq, int error); |
| 976 | extern bool blk_end_request_err(struct request *rq, int error); |
| 977 | extern bool __blk_end_request(struct request *rq, int error, |
| 978 | unsigned int nr_bytes); |
| 979 | extern void __blk_end_request_all(struct request *rq, int error); |
| 980 | extern bool __blk_end_request_cur(struct request *rq, int error); |
| 981 | extern bool __blk_end_request_err(struct request *rq, int error); |
| 982 | |
| 983 | extern void blk_complete_request(struct request *); |
| 984 | extern void __blk_complete_request(struct request *); |
| 985 | extern void blk_abort_request(struct request *); |
| 986 | extern void blk_unprep_request(struct request *); |
| 987 | |
| 988 | /* |
| 989 | * Access functions for manipulating queue properties |
| 990 | */ |
| 991 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
| 992 | spinlock_t *lock, int node_id); |
| 993 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
| 994 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
| 995 | request_fn_proc *, spinlock_t *); |
| 996 | extern void blk_cleanup_queue(struct request_queue *); |
| 997 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 998 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
| 999 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
| 1000 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
| 1001 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
| 1002 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
| 1003 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
| 1004 | unsigned int max_discard_sectors); |
| 1005 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
| 1006 | unsigned int max_write_same_sectors); |
| 1007 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
| 1008 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
| 1009 | extern void blk_queue_alignment_offset(struct request_queue *q, |
| 1010 | unsigned int alignment); |
| 1011 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
| 1012 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
| 1013 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
| 1014 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
| 1015 | extern void blk_set_default_limits(struct queue_limits *lim); |
| 1016 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
| 1017 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
| 1018 | sector_t offset); |
| 1019 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
| 1020 | sector_t offset); |
| 1021 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 1022 | sector_t offset); |
| 1023 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
| 1024 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
| 1025 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
| 1026 | extern int blk_queue_dma_drain(struct request_queue *q, |
| 1027 | dma_drain_needed_fn *dma_drain_needed, |
| 1028 | void *buf, unsigned int size); |
| 1029 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
| 1030 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
| 1031 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
| 1032 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
| 1033 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
| 1034 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
| 1035 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
| 1036 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
| 1037 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
| 1038 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
| 1039 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
| 1040 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
| 1041 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
| 1042 | |
| 1043 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
| 1044 | extern void blk_dump_rq_flags(struct request *, char *); |
| 1045 | extern long nr_blockdev_pages(void); |
| 1046 | |
| 1047 | bool __must_check blk_get_queue(struct request_queue *); |
| 1048 | struct request_queue *blk_alloc_queue(gfp_t); |
| 1049 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 1050 | extern void blk_put_queue(struct request_queue *); |
| 1051 | extern void blk_set_queue_dying(struct request_queue *); |
| 1052 | |
| 1053 | /* |
| 1054 | * block layer runtime pm functions |
| 1055 | */ |
| 1056 | #ifdef CONFIG_PM |
| 1057 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
| 1058 | extern int blk_pre_runtime_suspend(struct request_queue *q); |
| 1059 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); |
| 1060 | extern void blk_pre_runtime_resume(struct request_queue *q); |
| 1061 | extern void blk_post_runtime_resume(struct request_queue *q, int err); |
| 1062 | extern void blk_set_runtime_active(struct request_queue *q); |
| 1063 | #else |
| 1064 | static inline void blk_pm_runtime_init(struct request_queue *q, |
| 1065 | struct device *dev) {} |
| 1066 | static inline int blk_pre_runtime_suspend(struct request_queue *q) |
| 1067 | { |
| 1068 | return -ENOSYS; |
| 1069 | } |
| 1070 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} |
| 1071 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} |
| 1072 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} |
| 1073 | extern inline void blk_set_runtime_active(struct request_queue *q) {} |
| 1074 | #endif |
| 1075 | |
| 1076 | /* |
| 1077 | * blk_plug permits building a queue of related requests by holding the I/O |
| 1078 | * fragments for a short period. This allows merging of sequential requests |
| 1079 | * into single larger request. As the requests are moved from a per-task list to |
| 1080 | * the device's request_queue in a batch, this results in improved scalability |
| 1081 | * as the lock contention for request_queue lock is reduced. |
| 1082 | * |
| 1083 | * It is ok not to disable preemption when adding the request to the plug list |
| 1084 | * or when attempting a merge, because blk_schedule_flush_list() will only flush |
| 1085 | * the plug list when the task sleeps by itself. For details, please see |
| 1086 | * schedule() where blk_schedule_flush_plug() is called. |
| 1087 | */ |
| 1088 | struct blk_plug { |
| 1089 | struct list_head list; /* requests */ |
| 1090 | struct list_head mq_list; /* blk-mq requests */ |
| 1091 | struct list_head cb_list; /* md requires an unplug callback */ |
| 1092 | }; |
| 1093 | #define BLK_MAX_REQUEST_COUNT 16 |
| 1094 | |
| 1095 | struct blk_plug_cb; |
| 1096 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
| 1097 | struct blk_plug_cb { |
| 1098 | struct list_head list; |
| 1099 | blk_plug_cb_fn callback; |
| 1100 | void *data; |
| 1101 | }; |
| 1102 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
| 1103 | void *data, int size); |
| 1104 | extern void blk_start_plug(struct blk_plug *); |
| 1105 | extern void blk_finish_plug(struct blk_plug *); |
| 1106 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
| 1107 | |
| 1108 | static inline void blk_flush_plug(struct task_struct *tsk) |
| 1109 | { |
| 1110 | struct blk_plug *plug = tsk->plug; |
| 1111 | |
| 1112 | if (plug) |
| 1113 | blk_flush_plug_list(plug, false); |
| 1114 | } |
| 1115 | |
| 1116 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
| 1117 | { |
| 1118 | struct blk_plug *plug = tsk->plug; |
| 1119 | |
| 1120 | if (plug) |
| 1121 | blk_flush_plug_list(plug, true); |
| 1122 | } |
| 1123 | |
| 1124 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1125 | { |
| 1126 | struct blk_plug *plug = tsk->plug; |
| 1127 | |
| 1128 | return plug && |
| 1129 | (!list_empty(&plug->list) || |
| 1130 | !list_empty(&plug->mq_list) || |
| 1131 | !list_empty(&plug->cb_list)); |
| 1132 | } |
| 1133 | |
| 1134 | /* |
| 1135 | * tag stuff |
| 1136 | */ |
| 1137 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 1138 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 1139 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
| 1140 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
| 1141 | extern void blk_queue_free_tags(struct request_queue *); |
| 1142 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 1143 | extern void blk_queue_invalidate_tags(struct request_queue *); |
| 1144 | extern struct blk_queue_tag *blk_init_tags(int, int); |
| 1145 | extern void blk_free_tags(struct blk_queue_tag *); |
| 1146 | |
| 1147 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 1148 | int tag) |
| 1149 | { |
| 1150 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 1151 | return NULL; |
| 1152 | return bqt->tag_index[tag]; |
| 1153 | } |
| 1154 | |
| 1155 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ |
| 1156 | |
| 1157 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
| 1158 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| 1159 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
| 1160 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| 1161 | sector_t nr_sects, gfp_t gfp_mask, int op_flags, |
| 1162 | struct bio **biop); |
| 1163 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
| 1164 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
| 1165 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
| 1166 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
| 1167 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
| 1168 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
| 1169 | { |
| 1170 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
| 1171 | nr_blocks << (sb->s_blocksize_bits - 9), |
| 1172 | gfp_mask, flags); |
| 1173 | } |
| 1174 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
| 1175 | sector_t nr_blocks, gfp_t gfp_mask) |
| 1176 | { |
| 1177 | return blkdev_issue_zeroout(sb->s_bdev, |
| 1178 | block << (sb->s_blocksize_bits - 9), |
| 1179 | nr_blocks << (sb->s_blocksize_bits - 9), |
| 1180 | gfp_mask, true); |
| 1181 | } |
| 1182 | |
| 1183 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
| 1184 | |
| 1185 | enum blk_default_limits { |
| 1186 | BLK_MAX_SEGMENTS = 128, |
| 1187 | BLK_SAFE_MAX_SECTORS = 255, |
| 1188 | BLK_DEF_MAX_SECTORS = 2560, |
| 1189 | BLK_MAX_SEGMENT_SIZE = 65536, |
| 1190 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
| 1191 | }; |
| 1192 | |
| 1193 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 1194 | |
| 1195 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
| 1196 | { |
| 1197 | return q->limits.bounce_pfn; |
| 1198 | } |
| 1199 | |
| 1200 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
| 1201 | { |
| 1202 | return q->limits.seg_boundary_mask; |
| 1203 | } |
| 1204 | |
| 1205 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
| 1206 | { |
| 1207 | return q->limits.virt_boundary_mask; |
| 1208 | } |
| 1209 | |
| 1210 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
| 1211 | { |
| 1212 | return q->limits.max_sectors; |
| 1213 | } |
| 1214 | |
| 1215 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
| 1216 | { |
| 1217 | return q->limits.max_hw_sectors; |
| 1218 | } |
| 1219 | |
| 1220 | static inline unsigned short queue_max_segments(struct request_queue *q) |
| 1221 | { |
| 1222 | return q->limits.max_segments; |
| 1223 | } |
| 1224 | |
| 1225 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
| 1226 | { |
| 1227 | return q->limits.max_segment_size; |
| 1228 | } |
| 1229 | |
| 1230 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
| 1231 | { |
| 1232 | int retval = 512; |
| 1233 | |
| 1234 | if (q && q->limits.logical_block_size) |
| 1235 | retval = q->limits.logical_block_size; |
| 1236 | |
| 1237 | return retval; |
| 1238 | } |
| 1239 | |
| 1240 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
| 1241 | { |
| 1242 | return queue_logical_block_size(bdev_get_queue(bdev)); |
| 1243 | } |
| 1244 | |
| 1245 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
| 1246 | { |
| 1247 | return q->limits.physical_block_size; |
| 1248 | } |
| 1249 | |
| 1250 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
| 1251 | { |
| 1252 | return queue_physical_block_size(bdev_get_queue(bdev)); |
| 1253 | } |
| 1254 | |
| 1255 | static inline unsigned int queue_io_min(struct request_queue *q) |
| 1256 | { |
| 1257 | return q->limits.io_min; |
| 1258 | } |
| 1259 | |
| 1260 | static inline int bdev_io_min(struct block_device *bdev) |
| 1261 | { |
| 1262 | return queue_io_min(bdev_get_queue(bdev)); |
| 1263 | } |
| 1264 | |
| 1265 | static inline unsigned int queue_io_opt(struct request_queue *q) |
| 1266 | { |
| 1267 | return q->limits.io_opt; |
| 1268 | } |
| 1269 | |
| 1270 | static inline int bdev_io_opt(struct block_device *bdev) |
| 1271 | { |
| 1272 | return queue_io_opt(bdev_get_queue(bdev)); |
| 1273 | } |
| 1274 | |
| 1275 | static inline int queue_alignment_offset(struct request_queue *q) |
| 1276 | { |
| 1277 | if (q->limits.misaligned) |
| 1278 | return -1; |
| 1279 | |
| 1280 | return q->limits.alignment_offset; |
| 1281 | } |
| 1282 | |
| 1283 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
| 1284 | { |
| 1285 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
| 1286 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
| 1287 | |
| 1288 | return (granularity + lim->alignment_offset - alignment) % granularity; |
| 1289 | } |
| 1290 | |
| 1291 | static inline int bdev_alignment_offset(struct block_device *bdev) |
| 1292 | { |
| 1293 | struct request_queue *q = bdev_get_queue(bdev); |
| 1294 | |
| 1295 | if (q->limits.misaligned) |
| 1296 | return -1; |
| 1297 | |
| 1298 | if (bdev != bdev->bd_contains) |
| 1299 | return bdev->bd_part->alignment_offset; |
| 1300 | |
| 1301 | return q->limits.alignment_offset; |
| 1302 | } |
| 1303 | |
| 1304 | static inline int queue_discard_alignment(struct request_queue *q) |
| 1305 | { |
| 1306 | if (q->limits.discard_misaligned) |
| 1307 | return -1; |
| 1308 | |
| 1309 | return q->limits.discard_alignment; |
| 1310 | } |
| 1311 | |
| 1312 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
| 1313 | { |
| 1314 | unsigned int alignment, granularity, offset; |
| 1315 | |
| 1316 | if (!lim->max_discard_sectors) |
| 1317 | return 0; |
| 1318 | |
| 1319 | /* Why are these in bytes, not sectors? */ |
| 1320 | alignment = lim->discard_alignment >> 9; |
| 1321 | granularity = lim->discard_granularity >> 9; |
| 1322 | if (!granularity) |
| 1323 | return 0; |
| 1324 | |
| 1325 | /* Offset of the partition start in 'granularity' sectors */ |
| 1326 | offset = sector_div(sector, granularity); |
| 1327 | |
| 1328 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
| 1329 | offset = (granularity + alignment - offset) % granularity; |
| 1330 | |
| 1331 | /* Turn it back into bytes, gaah */ |
| 1332 | return offset << 9; |
| 1333 | } |
| 1334 | |
| 1335 | static inline int bdev_discard_alignment(struct block_device *bdev) |
| 1336 | { |
| 1337 | struct request_queue *q = bdev_get_queue(bdev); |
| 1338 | |
| 1339 | if (bdev != bdev->bd_contains) |
| 1340 | return bdev->bd_part->discard_alignment; |
| 1341 | |
| 1342 | return q->limits.discard_alignment; |
| 1343 | } |
| 1344 | |
| 1345 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
| 1346 | { |
| 1347 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
| 1348 | return 1; |
| 1349 | |
| 1350 | return 0; |
| 1351 | } |
| 1352 | |
| 1353 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) |
| 1354 | { |
| 1355 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); |
| 1356 | } |
| 1357 | |
| 1358 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
| 1359 | { |
| 1360 | struct request_queue *q = bdev_get_queue(bdev); |
| 1361 | |
| 1362 | if (q) |
| 1363 | return q->limits.max_write_same_sectors; |
| 1364 | |
| 1365 | return 0; |
| 1366 | } |
| 1367 | |
| 1368 | static inline int queue_dma_alignment(struct request_queue *q) |
| 1369 | { |
| 1370 | return q ? q->dma_alignment : 511; |
| 1371 | } |
| 1372 | |
| 1373 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
| 1374 | unsigned int len) |
| 1375 | { |
| 1376 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
| 1377 | return !(addr & alignment) && !(len & alignment); |
| 1378 | } |
| 1379 | |
| 1380 | /* assumes size > 256 */ |
| 1381 | static inline unsigned int blksize_bits(unsigned int size) |
| 1382 | { |
| 1383 | unsigned int bits = 8; |
| 1384 | do { |
| 1385 | bits++; |
| 1386 | size >>= 1; |
| 1387 | } while (size > 256); |
| 1388 | return bits; |
| 1389 | } |
| 1390 | |
| 1391 | static inline unsigned int block_size(struct block_device *bdev) |
| 1392 | { |
| 1393 | return bdev->bd_block_size; |
| 1394 | } |
| 1395 | |
| 1396 | static inline bool queue_flush_queueable(struct request_queue *q) |
| 1397 | { |
| 1398 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
| 1399 | } |
| 1400 | |
| 1401 | typedef struct {struct page *v;} Sector; |
| 1402 | |
| 1403 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 1404 | |
| 1405 | static inline void put_dev_sector(Sector p) |
| 1406 | { |
| 1407 | put_page(p.v); |
| 1408 | } |
| 1409 | |
| 1410 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
| 1411 | struct bio_vec *bprv, unsigned int offset) |
| 1412 | { |
| 1413 | return offset || |
| 1414 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); |
| 1415 | } |
| 1416 | |
| 1417 | /* |
| 1418 | * Check if adding a bio_vec after bprv with offset would create a gap in |
| 1419 | * the SG list. Most drivers don't care about this, but some do. |
| 1420 | */ |
| 1421 | static inline bool bvec_gap_to_prev(struct request_queue *q, |
| 1422 | struct bio_vec *bprv, unsigned int offset) |
| 1423 | { |
| 1424 | if (!queue_virt_boundary(q)) |
| 1425 | return false; |
| 1426 | return __bvec_gap_to_prev(q, bprv, offset); |
| 1427 | } |
| 1428 | |
| 1429 | static inline bool bio_will_gap(struct request_queue *q, struct bio *prev, |
| 1430 | struct bio *next) |
| 1431 | { |
| 1432 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
| 1433 | struct bio_vec pb, nb; |
| 1434 | |
| 1435 | bio_get_last_bvec(prev, &pb); |
| 1436 | bio_get_first_bvec(next, &nb); |
| 1437 | |
| 1438 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); |
| 1439 | } |
| 1440 | |
| 1441 | return false; |
| 1442 | } |
| 1443 | |
| 1444 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) |
| 1445 | { |
| 1446 | return bio_will_gap(req->q, req->biotail, bio); |
| 1447 | } |
| 1448 | |
| 1449 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) |
| 1450 | { |
| 1451 | return bio_will_gap(req->q, bio, req->bio); |
| 1452 | } |
| 1453 | |
| 1454 | struct work_struct; |
| 1455 | int kblockd_schedule_work(struct work_struct *work); |
| 1456 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
| 1457 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
| 1458 | |
| 1459 | #ifdef CONFIG_BLK_CGROUP |
| 1460 | /* |
| 1461 | * This should not be using sched_clock(). A real patch is in progress |
| 1462 | * to fix this up, until that is in place we need to disable preemption |
| 1463 | * around sched_clock() in this function and set_io_start_time_ns(). |
| 1464 | */ |
| 1465 | static inline void set_start_time_ns(struct request *req) |
| 1466 | { |
| 1467 | preempt_disable(); |
| 1468 | req->start_time_ns = sched_clock(); |
| 1469 | preempt_enable(); |
| 1470 | } |
| 1471 | |
| 1472 | static inline void set_io_start_time_ns(struct request *req) |
| 1473 | { |
| 1474 | preempt_disable(); |
| 1475 | req->io_start_time_ns = sched_clock(); |
| 1476 | preempt_enable(); |
| 1477 | } |
| 1478 | |
| 1479 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1480 | { |
| 1481 | return req->start_time_ns; |
| 1482 | } |
| 1483 | |
| 1484 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1485 | { |
| 1486 | return req->io_start_time_ns; |
| 1487 | } |
| 1488 | #else |
| 1489 | static inline void set_start_time_ns(struct request *req) {} |
| 1490 | static inline void set_io_start_time_ns(struct request *req) {} |
| 1491 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1492 | { |
| 1493 | return 0; |
| 1494 | } |
| 1495 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1496 | { |
| 1497 | return 0; |
| 1498 | } |
| 1499 | #endif |
| 1500 | |
| 1501 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 1502 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 1503 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 1504 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 1505 | |
| 1506 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 1507 | |
| 1508 | enum blk_integrity_flags { |
| 1509 | BLK_INTEGRITY_VERIFY = 1 << 0, |
| 1510 | BLK_INTEGRITY_GENERATE = 1 << 1, |
| 1511 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
| 1512 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
| 1513 | }; |
| 1514 | |
| 1515 | struct blk_integrity_iter { |
| 1516 | void *prot_buf; |
| 1517 | void *data_buf; |
| 1518 | sector_t seed; |
| 1519 | unsigned int data_size; |
| 1520 | unsigned short interval; |
| 1521 | const char *disk_name; |
| 1522 | }; |
| 1523 | |
| 1524 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
| 1525 | |
| 1526 | struct blk_integrity_profile { |
| 1527 | integrity_processing_fn *generate_fn; |
| 1528 | integrity_processing_fn *verify_fn; |
| 1529 | const char *name; |
| 1530 | }; |
| 1531 | |
| 1532 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| 1533 | extern void blk_integrity_unregister(struct gendisk *); |
| 1534 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
| 1535 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| 1536 | struct scatterlist *); |
| 1537 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
| 1538 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
| 1539 | struct request *); |
| 1540 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, |
| 1541 | struct bio *); |
| 1542 | |
| 1543 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1544 | { |
| 1545 | struct blk_integrity *bi = &disk->queue->integrity; |
| 1546 | |
| 1547 | if (!bi->profile) |
| 1548 | return NULL; |
| 1549 | |
| 1550 | return bi; |
| 1551 | } |
| 1552 | |
| 1553 | static inline |
| 1554 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1555 | { |
| 1556 | return blk_get_integrity(bdev->bd_disk); |
| 1557 | } |
| 1558 | |
| 1559 | static inline bool blk_integrity_rq(struct request *rq) |
| 1560 | { |
| 1561 | return rq->cmd_flags & REQ_INTEGRITY; |
| 1562 | } |
| 1563 | |
| 1564 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1565 | unsigned int segs) |
| 1566 | { |
| 1567 | q->limits.max_integrity_segments = segs; |
| 1568 | } |
| 1569 | |
| 1570 | static inline unsigned short |
| 1571 | queue_max_integrity_segments(struct request_queue *q) |
| 1572 | { |
| 1573 | return q->limits.max_integrity_segments; |
| 1574 | } |
| 1575 | |
| 1576 | static inline bool integrity_req_gap_back_merge(struct request *req, |
| 1577 | struct bio *next) |
| 1578 | { |
| 1579 | struct bio_integrity_payload *bip = bio_integrity(req->bio); |
| 1580 | struct bio_integrity_payload *bip_next = bio_integrity(next); |
| 1581 | |
| 1582 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], |
| 1583 | bip_next->bip_vec[0].bv_offset); |
| 1584 | } |
| 1585 | |
| 1586 | static inline bool integrity_req_gap_front_merge(struct request *req, |
| 1587 | struct bio *bio) |
| 1588 | { |
| 1589 | struct bio_integrity_payload *bip = bio_integrity(bio); |
| 1590 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); |
| 1591 | |
| 1592 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], |
| 1593 | bip_next->bip_vec[0].bv_offset); |
| 1594 | } |
| 1595 | |
| 1596 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1597 | |
| 1598 | struct bio; |
| 1599 | struct block_device; |
| 1600 | struct gendisk; |
| 1601 | struct blk_integrity; |
| 1602 | |
| 1603 | static inline int blk_integrity_rq(struct request *rq) |
| 1604 | { |
| 1605 | return 0; |
| 1606 | } |
| 1607 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
| 1608 | struct bio *b) |
| 1609 | { |
| 1610 | return 0; |
| 1611 | } |
| 1612 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
| 1613 | struct bio *b, |
| 1614 | struct scatterlist *s) |
| 1615 | { |
| 1616 | return 0; |
| 1617 | } |
| 1618 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
| 1619 | { |
| 1620 | return NULL; |
| 1621 | } |
| 1622 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1623 | { |
| 1624 | return NULL; |
| 1625 | } |
| 1626 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
| 1627 | { |
| 1628 | return 0; |
| 1629 | } |
| 1630 | static inline void blk_integrity_register(struct gendisk *d, |
| 1631 | struct blk_integrity *b) |
| 1632 | { |
| 1633 | } |
| 1634 | static inline void blk_integrity_unregister(struct gendisk *d) |
| 1635 | { |
| 1636 | } |
| 1637 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1638 | unsigned int segs) |
| 1639 | { |
| 1640 | } |
| 1641 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) |
| 1642 | { |
| 1643 | return 0; |
| 1644 | } |
| 1645 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
| 1646 | struct request *r1, |
| 1647 | struct request *r2) |
| 1648 | { |
| 1649 | return true; |
| 1650 | } |
| 1651 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
| 1652 | struct request *r, |
| 1653 | struct bio *b) |
| 1654 | { |
| 1655 | return true; |
| 1656 | } |
| 1657 | |
| 1658 | static inline bool integrity_req_gap_back_merge(struct request *req, |
| 1659 | struct bio *next) |
| 1660 | { |
| 1661 | return false; |
| 1662 | } |
| 1663 | static inline bool integrity_req_gap_front_merge(struct request *req, |
| 1664 | struct bio *bio) |
| 1665 | { |
| 1666 | return false; |
| 1667 | } |
| 1668 | |
| 1669 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1670 | |
| 1671 | /** |
| 1672 | * struct blk_dax_ctl - control and output parameters for ->direct_access |
| 1673 | * @sector: (input) offset relative to a block_device |
| 1674 | * @addr: (output) kernel virtual address for @sector populated by driver |
| 1675 | * @pfn: (output) page frame number for @addr populated by driver |
| 1676 | * @size: (input) number of bytes requested |
| 1677 | */ |
| 1678 | struct blk_dax_ctl { |
| 1679 | sector_t sector; |
| 1680 | void __pmem *addr; |
| 1681 | long size; |
| 1682 | pfn_t pfn; |
| 1683 | }; |
| 1684 | |
| 1685 | struct block_device_operations { |
| 1686 | int (*open) (struct block_device *, fmode_t); |
| 1687 | void (*release) (struct gendisk *, fmode_t); |
| 1688 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
| 1689 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1690 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1691 | long (*direct_access)(struct block_device *, sector_t, void __pmem **, |
| 1692 | pfn_t *, long); |
| 1693 | unsigned int (*check_events) (struct gendisk *disk, |
| 1694 | unsigned int clearing); |
| 1695 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ |
| 1696 | int (*media_changed) (struct gendisk *); |
| 1697 | void (*unlock_native_capacity) (struct gendisk *); |
| 1698 | int (*revalidate_disk) (struct gendisk *); |
| 1699 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
| 1700 | /* this callback is with swap_lock and sometimes page table lock held */ |
| 1701 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
| 1702 | struct module *owner; |
| 1703 | const struct pr_ops *pr_ops; |
| 1704 | }; |
| 1705 | |
| 1706 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| 1707 | unsigned long); |
| 1708 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
| 1709 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, |
| 1710 | struct writeback_control *); |
| 1711 | extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); |
| 1712 | extern int bdev_dax_supported(struct super_block *, int); |
| 1713 | extern bool bdev_dax_capable(struct block_device *); |
| 1714 | #else /* CONFIG_BLOCK */ |
| 1715 | |
| 1716 | struct block_device; |
| 1717 | |
| 1718 | /* |
| 1719 | * stubs for when the block layer is configured out |
| 1720 | */ |
| 1721 | #define buffer_heads_over_limit 0 |
| 1722 | |
| 1723 | static inline long nr_blockdev_pages(void) |
| 1724 | { |
| 1725 | return 0; |
| 1726 | } |
| 1727 | |
| 1728 | struct blk_plug { |
| 1729 | }; |
| 1730 | |
| 1731 | static inline void blk_start_plug(struct blk_plug *plug) |
| 1732 | { |
| 1733 | } |
| 1734 | |
| 1735 | static inline void blk_finish_plug(struct blk_plug *plug) |
| 1736 | { |
| 1737 | } |
| 1738 | |
| 1739 | static inline void blk_flush_plug(struct task_struct *task) |
| 1740 | { |
| 1741 | } |
| 1742 | |
| 1743 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
| 1744 | { |
| 1745 | } |
| 1746 | |
| 1747 | |
| 1748 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1749 | { |
| 1750 | return false; |
| 1751 | } |
| 1752 | |
| 1753 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
| 1754 | sector_t *error_sector) |
| 1755 | { |
| 1756 | return 0; |
| 1757 | } |
| 1758 | |
| 1759 | #endif /* CONFIG_BLOCK */ |
| 1760 | |
| 1761 | #endif |