block/blk.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef BLK_INTERNAL_H
   3 #define BLK_INTERNAL_H
   4
   5 #include <linux/idr.h>
   6 #include <linux/blk-mq.h>
   7 #include <linux/part_stat.h>
   8 #include <linux/blk-crypto.h>
   9 #include <xen/xen.h>
  10 #include "blk-crypto-internal.h"
  11 #include "blk-mq.h"
  12 #include "blk-mq-sched.h"
  13
  14 /* Max future timer expiry for timeouts */
  15 #define BLK_MAX_TIMEOUT         (5 * HZ)
  16
  17 extern struct dentry *blk_debugfs_root;
  18
  19 struct blk_flush_queue {
  20         unsigned int            flush_pending_idx:1;
  21         unsigned int            flush_running_idx:1;
  22         blk_status_t            rq_status;
  23         unsigned long           flush_pending_since;
  24         struct list_head        flush_queue[2];
  25         struct list_head        flush_data_in_flight;
  26         struct request          *flush_rq;
  27
  28         spinlock_t              mq_flush_lock;
  29 };
  30
  31 extern struct kmem_cache *blk_requestq_cachep;
  32 extern struct kobj_type blk_queue_ktype;
  33 extern struct ida blk_queue_ida;
  34
  35 static inline struct blk_flush_queue *
  36 blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
  37 {
  38         return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
  39 }
  40
  41 static inline void __blk_get_queue(struct request_queue *q)
  42 {
  43         kobject_get(&q->kobj);
  44 }
  45
  46 static inline bool
  47 is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
  48 {
  49         return hctx->fq->flush_rq == req;
  50 }
  51
  52 struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
  53                                               gfp_t flags);
  54 void blk_free_flush_queue(struct blk_flush_queue *q);
  55
  56 void blk_freeze_queue(struct request_queue *q);
  57
  58 static inline bool biovec_phys_mergeable(struct request_queue *q,
  59                 struct bio_vec *vec1, struct bio_vec *vec2)
  60 {
  61         unsigned long mask = queue_segment_boundary(q);
  62         phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
  63         phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
  64
  65         if (addr1 + vec1->bv_len != addr2)
  66                 return false;
  67         if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
  68                 return false;
  69         if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
  70                 return false;
  71         return true;
  72 }
  73
  74 static inline bool __bvec_gap_to_prev(struct request_queue *q,
  75                 struct bio_vec *bprv, unsigned int offset)
  76 {
  77         return (offset & queue_virt_boundary(q)) ||
  78                 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
  79 }
  80
  81 /*
  82  * Check if adding a bio_vec after bprv with offset would create a gap in
  83  * the SG list. Most drivers don't care about this, but some do.
  84  */
  85 static inline bool bvec_gap_to_prev(struct request_queue *q,
  86                 struct bio_vec *bprv, unsigned int offset)
  87 {
  88         if (!queue_virt_boundary(q))
  89                 return false;
  90         return __bvec_gap_to_prev(q, bprv, offset);
  91 }
  92
  93 #ifdef CONFIG_BLK_DEV_INTEGRITY
  94 void blk_flush_integrity(void);
  95 bool __bio_integrity_endio(struct bio *);
  96 void bio_integrity_free(struct bio *bio);
  97 static inline bool bio_integrity_endio(struct bio *bio)
  98 {
  99         if (bio_integrity(bio))
 100                 return __bio_integrity_endio(bio);
 101         return true;
 102 }
 103
 104 bool blk_integrity_merge_rq(struct request_queue *, struct request *,
 105                 struct request *);
 106 bool blk_integrity_merge_bio(struct request_queue *, struct request *,
 107                 struct bio *);
 108
 109 static inline bool integrity_req_gap_back_merge(struct request *req,
 110                 struct bio *next)
 111 {
 112         struct bio_integrity_payload *bip = bio_integrity(req->bio);
 113         struct bio_integrity_payload *bip_next = bio_integrity(next);
 114
 115         return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
 116                                 bip_next->bip_vec[0].bv_offset);
 117 }
 118
 119 static inline bool integrity_req_gap_front_merge(struct request *req,
 120                 struct bio *bio)
 121 {
 122         struct bio_integrity_payload *bip = bio_integrity(bio);
 123         struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
 124
 125         return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
 126                                 bip_next->bip_vec[0].bv_offset);
 127 }
 128
 129 void blk_integrity_add(struct gendisk *);
 130 void blk_integrity_del(struct gendisk *);
 131 #else /* CONFIG_BLK_DEV_INTEGRITY */
 132 static inline bool blk_integrity_merge_rq(struct request_queue *rq,
 133                 struct request *r1, struct request *r2)
 134 {
 135         return true;
 136 }
 137 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
 138                 struct request *r, struct bio *b)
 139 {
 140         return true;
 141 }
 142 static inline bool integrity_req_gap_back_merge(struct request *req,
 143                 struct bio *next)
 144 {
 145         return false;
 146 }
 147 static inline bool integrity_req_gap_front_merge(struct request *req,
 148                 struct bio *bio)
 149 {
 150         return false;
 151 }
 152
 153 static inline void blk_flush_integrity(void)
 154 {
 155 }
 156 static inline bool bio_integrity_endio(struct bio *bio)
 157 {
 158         return true;
 159 }
 160 static inline void bio_integrity_free(struct bio *bio)
 161 {
 162 }
 163 static inline void blk_integrity_add(struct gendisk *disk)
 164 {
 165 }
 166 static inline void blk_integrity_del(struct gendisk *disk)
 167 {
 168 }
 169 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 170
 171 unsigned long blk_rq_timeout(unsigned long timeout);
 172 void blk_add_timer(struct request *req);
 173
 174 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
 175                 unsigned int nr_segs, struct request **same_queue_rq);
 176 bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
 177                         struct bio *bio, unsigned int nr_segs);
 178
 179 void blk_account_io_start(struct request *req);
 180 void blk_account_io_done(struct request *req, u64 now);
 181
 182 /*
 183  * Internal elevator interface
 184  */
 185 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
 186
 187 void blk_insert_flush(struct request *rq);
 188
 189 void elevator_init_mq(struct request_queue *q);
 190 int elevator_switch_mq(struct request_queue *q,
 191                               struct elevator_type *new_e);
 192 void __elevator_exit(struct request_queue *, struct elevator_queue *);
 193 int elv_register_queue(struct request_queue *q, bool uevent);
 194 void elv_unregister_queue(struct request_queue *q);
 195
 196 static inline void elevator_exit(struct request_queue *q,
 197                 struct elevator_queue *e)
 198 {
 199         lockdep_assert_held(&q->sysfs_lock);
 200
 201         blk_mq_sched_free_requests(q);
 202         __elevator_exit(q, e);
 203 }
 204
 205 struct block_device *__disk_get_part(struct gendisk *disk, int partno);
 206
 207 ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
 208                 char *buf);
 209 ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
 210                 char *buf);
 211 ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
 212                 char *buf);
 213 ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
 214                 char *buf);
 215 ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
 216                 const char *buf, size_t count);
 217 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
 218 ssize_t part_timeout_store(struct device *, struct device_attribute *,
 219                                 const char *, size_t);
 220
 221 void __blk_queue_split(struct bio **bio, unsigned int *nr_segs);
 222 int ll_back_merge_fn(struct request *req, struct bio *bio,
 223                 unsigned int nr_segs);
 224 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
 225                                 struct request *next);
 226 unsigned int blk_recalc_rq_segments(struct request *rq);
 227 void blk_rq_set_mixed_merge(struct request *rq);
 228 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
 229 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
 230
 231 int blk_dev_init(void);
 232
 233 /*
 234  * Contribute to IO statistics IFF:
 235  *
 236  *      a) it's attached to a gendisk, and
 237  *      b) the queue had IO stats enabled when this request was started
 238  */
 239 static inline bool blk_do_io_stat(struct request *rq)
 240 {
 241         return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
 242 }
 243
 244 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
 245 {
 246         req->cmd_flags |= REQ_NOMERGE;
 247         if (req == q->last_merge)
 248                 q->last_merge = NULL;
 249 }
 250
 251 /*
 252  * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
 253  * is defined as 'unsigned int', meantime it has to aligned to with logical
 254  * block size which is the minimum accepted unit by hardware.
 255  */
 256 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
 257 {
 258         return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
 259 }
 260
 261 /*
 262  * The max bio size which is aligned to q->limits.discard_granularity. This
 263  * is a hint to split large discard bio in generic block layer, then if device
 264  * driver needs to split the discard bio into smaller ones, their bi_size can
 265  * be very probably and easily aligned to discard_granularity of the device's
 266  * queue.
 267  */
 268 static inline unsigned int bio_aligned_discard_max_sectors(
 269                                         struct request_queue *q)
 270 {
 271         return round_down(UINT_MAX, q->limits.discard_granularity) >>
 272                         SECTOR_SHIFT;
 273 }
 274
 275 /*
 276  * Internal io_context interface
 277  */
 278 void get_io_context(struct io_context *ioc);
 279 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
 280 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
 281                              gfp_t gfp_mask);
 282 void ioc_clear_queue(struct request_queue *q);
 283
 284 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
 285
 286 /*
 287  * Internal throttling interface
 288  */
 289 #ifdef CONFIG_BLK_DEV_THROTTLING
 290 extern int blk_throtl_init(struct request_queue *q);
 291 extern void blk_throtl_exit(struct request_queue *q);
 292 extern void blk_throtl_register_queue(struct request_queue *q);
 293 bool blk_throtl_bio(struct bio *bio);
 294 #else /* CONFIG_BLK_DEV_THROTTLING */
 295 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
 296 static inline void blk_throtl_exit(struct request_queue *q) { }
 297 static inline void blk_throtl_register_queue(struct request_queue *q) { }
 298 static inline bool blk_throtl_bio(struct bio *bio) { return false; }
 299 #endif /* CONFIG_BLK_DEV_THROTTLING */
 300 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
 301 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
 302 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
 303         const char *page, size_t count);
 304 extern void blk_throtl_bio_endio(struct bio *bio);
 305 extern void blk_throtl_stat_add(struct request *rq, u64 time);
 306 #else
 307 static inline void blk_throtl_bio_endio(struct bio *bio) { }
 308 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
 309 #endif
 310
 311 #ifdef CONFIG_BOUNCE
 312 extern int init_emergency_isa_pool(void);
 313 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
 314 #else
 315 static inline int init_emergency_isa_pool(void)
 316 {
 317         return 0;
 318 }
 319 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
 320 {
 321 }
 322 #endif /* CONFIG_BOUNCE */
 323
 324 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
 325 extern int blk_iolatency_init(struct request_queue *q);
 326 #else
 327 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
 328 #endif
 329
 330 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
 331
 332 #ifdef CONFIG_BLK_DEV_ZONED
 333 void blk_queue_free_zone_bitmaps(struct request_queue *q);
 334 #else
 335 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
 336 #endif
 337
 338 struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector);
 339
 340 int blk_alloc_devt(struct block_device *part, dev_t *devt);
 341 void blk_free_devt(dev_t devt);
 342 char *disk_name(struct gendisk *hd, int partno, char *buf);
 343 #define ADDPART_FLAG_NONE       0
 344 #define ADDPART_FLAG_RAID       1
 345 #define ADDPART_FLAG_WHOLEDISK  2
 346 void delete_partition(struct block_device *part);
 347 int bdev_add_partition(struct block_device *bdev, int partno,
 348                 sector_t start, sector_t length);
 349 int bdev_del_partition(struct block_device *bdev, int partno);
 350 int bdev_resize_partition(struct block_device *bdev, int partno,
 351                 sector_t start, sector_t length);
 352 int disk_expand_part_tbl(struct gendisk *disk, int target);
 353
 354 int bio_add_hw_page(struct request_queue *q, struct bio *bio,
 355                 struct page *page, unsigned int len, unsigned int offset,
 356                 unsigned int max_sectors, bool *same_page);
 357
 358 #endif /* BLK_INTERNAL_H */