1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/blk-mq.h>
7 #include <linux/part_stat.h>
8 #include <linux/blk-crypto.h>
10 #include "blk-crypto-internal.h"
12 #include "blk-mq-sched.h"
14 /* Max future timer expiry for timeouts */
15 #define BLK_MAX_TIMEOUT (5 * HZ)
17 extern struct dentry *blk_debugfs_root;
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;
28 spinlock_t mq_flush_lock;
31 extern struct kmem_cache *blk_requestq_cachep;
32 extern struct kobj_type blk_queue_ktype;
33 extern struct ida blk_queue_ida;
35 static inline struct blk_flush_queue *
36 blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
38 return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
41 static inline void __blk_get_queue(struct request_queue *q)
43 kobject_get(&q->kobj);
47 is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
49 return hctx->fq->flush_rq == req;
52 struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
54 void blk_free_flush_queue(struct blk_flush_queue *q);
56 void blk_freeze_queue(struct request_queue *q);
58 static inline bool biovec_phys_mergeable(struct request_queue *q,
59 struct bio_vec *vec1, struct bio_vec *vec2)
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;
65 if (addr1 + vec1->bv_len != addr2)
67 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
69 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
74 static inline bool __bvec_gap_to_prev(struct request_queue *q,
75 struct bio_vec *bprv, unsigned int offset)
77 return (offset & queue_virt_boundary(q)) ||
78 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
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.
85 static inline bool bvec_gap_to_prev(struct request_queue *q,
86 struct bio_vec *bprv, unsigned int offset)
88 if (!queue_virt_boundary(q))
90 return __bvec_gap_to_prev(q, bprv, offset);
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)
99 if (bio_integrity(bio))
100 return __bio_integrity_endio(bio);
104 bool blk_integrity_merge_rq(struct request_queue *, struct request *,
106 bool blk_integrity_merge_bio(struct request_queue *, struct request *,
109 static inline bool integrity_req_gap_back_merge(struct request *req,
112 struct bio_integrity_payload *bip = bio_integrity(req->bio);
113 struct bio_integrity_payload *bip_next = bio_integrity(next);
115 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
116 bip_next->bip_vec[0].bv_offset);
119 static inline bool integrity_req_gap_front_merge(struct request *req,
122 struct bio_integrity_payload *bip = bio_integrity(bio);
123 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
125 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
126 bip_next->bip_vec[0].bv_offset);
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)
137 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
138 struct request *r, struct bio *b)
142 static inline bool integrity_req_gap_back_merge(struct request *req,
147 static inline bool integrity_req_gap_front_merge(struct request *req,
153 static inline void blk_flush_integrity(void)
156 static inline bool bio_integrity_endio(struct bio *bio)
160 static inline void bio_integrity_free(struct bio *bio)
163 static inline void blk_integrity_add(struct gendisk *disk)
166 static inline void blk_integrity_del(struct gendisk *disk)
169 #endif /* CONFIG_BLK_DEV_INTEGRITY */
171 unsigned long blk_rq_timeout(unsigned long timeout);
172 void blk_add_timer(struct request *req);
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);
179 void blk_account_io_start(struct request *req);
180 void blk_account_io_done(struct request *req, u64 now);
183 * Internal elevator interface
185 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
187 void blk_insert_flush(struct request *rq);
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);
196 static inline void elevator_exit(struct request_queue *q,
197 struct elevator_queue *e)
199 lockdep_assert_held(&q->sysfs_lock);
201 blk_mq_sched_free_requests(q);
202 __elevator_exit(q, e);
205 struct block_device *__disk_get_part(struct gendisk *disk, int partno);
207 ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
209 ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
211 ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
213 ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
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);
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);
231 int blk_dev_init(void);
234 * Contribute to IO statistics IFF:
236 * a) it's attached to a gendisk, and
237 * b) the queue had IO stats enabled when this request was started
239 static inline bool blk_do_io_stat(struct request *rq)
241 return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
244 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
246 req->cmd_flags |= REQ_NOMERGE;
247 if (req == q->last_merge)
248 q->last_merge = NULL;
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.
256 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
258 return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
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
268 static inline unsigned int bio_aligned_discard_max_sectors(
269 struct request_queue *q)
271 return round_down(UINT_MAX, q->limits.discard_granularity) >>
276 * Internal io_context interface
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,
282 void ioc_clear_queue(struct request_queue *q);
284 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
287 * Internal throttling interface
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);
307 static inline void blk_throtl_bio_endio(struct bio *bio) { }
308 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
312 extern int init_emergency_isa_pool(void);
313 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
315 static inline int init_emergency_isa_pool(void)
319 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
322 #endif /* CONFIG_BOUNCE */
324 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
325 extern int blk_iolatency_init(struct request_queue *q);
327 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
330 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
332 #ifdef CONFIG_BLK_DEV_ZONED
333 void blk_queue_free_zone_bitmaps(struct request_queue *q);
335 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
338 struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector);
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);
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);
358 #endif /* BLK_INTERNAL_H */