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 #ifdef CONFIG_DEBUG_FS
18 extern struct dentry
*blk_debugfs_root
;
21 struct blk_flush_queue
{
22 unsigned int flush_pending_idx
:1;
23 unsigned int flush_running_idx
:1;
24 blk_status_t rq_status
;
25 unsigned long flush_pending_since
;
26 struct list_head flush_queue
[2];
27 struct list_head flush_data_in_flight
;
28 struct request
*flush_rq
;
31 * flush_rq shares tag with this rq, both can't be active
34 struct request
*orig_rq
;
35 struct lock_class_key key
;
36 spinlock_t mq_flush_lock
;
39 extern struct kmem_cache
*blk_requestq_cachep
;
40 extern struct kobj_type blk_queue_ktype
;
41 extern struct ida blk_queue_ida
;
43 static inline struct blk_flush_queue
*
44 blk_get_flush_queue(struct request_queue
*q
, struct blk_mq_ctx
*ctx
)
46 return blk_mq_map_queue(q
, REQ_OP_FLUSH
, ctx
)->fq
;
49 static inline void __blk_get_queue(struct request_queue
*q
)
51 kobject_get(&q
->kobj
);
55 is_flush_rq(struct request
*req
, struct blk_mq_hw_ctx
*hctx
)
57 return hctx
->fq
->flush_rq
== req
;
60 struct blk_flush_queue
*blk_alloc_flush_queue(int node
, int cmd_size
,
62 void blk_free_flush_queue(struct blk_flush_queue
*q
);
64 void blk_freeze_queue(struct request_queue
*q
);
66 static inline bool biovec_phys_mergeable(struct request_queue
*q
,
67 struct bio_vec
*vec1
, struct bio_vec
*vec2
)
69 unsigned long mask
= queue_segment_boundary(q
);
70 phys_addr_t addr1
= page_to_phys(vec1
->bv_page
) + vec1
->bv_offset
;
71 phys_addr_t addr2
= page_to_phys(vec2
->bv_page
) + vec2
->bv_offset
;
73 if (addr1
+ vec1
->bv_len
!= addr2
)
75 if (xen_domain() && !xen_biovec_phys_mergeable(vec1
, vec2
->bv_page
))
77 if ((addr1
| mask
) != ((addr2
+ vec2
->bv_len
- 1) | mask
))
82 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
83 struct bio_vec
*bprv
, unsigned int offset
)
85 return (offset
& queue_virt_boundary(q
)) ||
86 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
90 * Check if adding a bio_vec after bprv with offset would create a gap in
91 * the SG list. Most drivers don't care about this, but some do.
93 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
94 struct bio_vec
*bprv
, unsigned int offset
)
96 if (!queue_virt_boundary(q
))
98 return __bvec_gap_to_prev(q
, bprv
, offset
);
101 static inline void blk_rq_bio_prep(struct request
*rq
, struct bio
*bio
,
102 unsigned int nr_segs
)
104 rq
->nr_phys_segments
= nr_segs
;
105 rq
->__data_len
= bio
->bi_iter
.bi_size
;
106 rq
->bio
= rq
->biotail
= bio
;
107 rq
->ioprio
= bio_prio(bio
);
110 rq
->rq_disk
= bio
->bi_disk
;
113 #ifdef CONFIG_BLK_DEV_INTEGRITY
114 void blk_flush_integrity(void);
115 bool __bio_integrity_endio(struct bio
*);
116 void bio_integrity_free(struct bio
*bio
);
117 static inline bool bio_integrity_endio(struct bio
*bio
)
119 if (bio_integrity(bio
))
120 return __bio_integrity_endio(bio
);
124 static inline bool integrity_req_gap_back_merge(struct request
*req
,
127 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
128 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
130 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
131 bip_next
->bip_vec
[0].bv_offset
);
134 static inline bool integrity_req_gap_front_merge(struct request
*req
,
137 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
138 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
140 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
141 bip_next
->bip_vec
[0].bv_offset
);
144 void blk_integrity_add(struct gendisk
*);
145 void blk_integrity_del(struct gendisk
*);
146 #else /* CONFIG_BLK_DEV_INTEGRITY */
147 static inline bool integrity_req_gap_back_merge(struct request
*req
,
152 static inline bool integrity_req_gap_front_merge(struct request
*req
,
158 static inline void blk_flush_integrity(void)
161 static inline bool bio_integrity_endio(struct bio
*bio
)
165 static inline void bio_integrity_free(struct bio
*bio
)
168 static inline void blk_integrity_add(struct gendisk
*disk
)
171 static inline void blk_integrity_del(struct gendisk
*disk
)
174 #endif /* CONFIG_BLK_DEV_INTEGRITY */
176 unsigned long blk_rq_timeout(unsigned long timeout
);
177 void blk_add_timer(struct request
*req
);
179 bool bio_attempt_front_merge(struct request
*req
, struct bio
*bio
,
180 unsigned int nr_segs
);
181 bool bio_attempt_back_merge(struct request
*req
, struct bio
*bio
,
182 unsigned int nr_segs
);
183 bool bio_attempt_discard_merge(struct request_queue
*q
, struct request
*req
,
185 bool blk_attempt_plug_merge(struct request_queue
*q
, struct bio
*bio
,
186 unsigned int nr_segs
, struct request
**same_queue_rq
);
188 void blk_account_io_start(struct request
*req
);
189 void blk_account_io_done(struct request
*req
, u64 now
);
192 * Internal elevator interface
194 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
196 void blk_insert_flush(struct request
*rq
);
198 void elevator_init_mq(struct request_queue
*q
);
199 int elevator_switch_mq(struct request_queue
*q
,
200 struct elevator_type
*new_e
);
201 void __elevator_exit(struct request_queue
*, struct elevator_queue
*);
202 int elv_register_queue(struct request_queue
*q
, bool uevent
);
203 void elv_unregister_queue(struct request_queue
*q
);
205 static inline void elevator_exit(struct request_queue
*q
,
206 struct elevator_queue
*e
)
208 lockdep_assert_held(&q
->sysfs_lock
);
210 blk_mq_sched_free_requests(q
);
211 __elevator_exit(q
, e
);
214 struct hd_struct
*__disk_get_part(struct gendisk
*disk
, int partno
);
216 ssize_t
part_size_show(struct device
*dev
, struct device_attribute
*attr
,
218 ssize_t
part_stat_show(struct device
*dev
, struct device_attribute
*attr
,
220 ssize_t
part_inflight_show(struct device
*dev
, struct device_attribute
*attr
,
222 ssize_t
part_fail_show(struct device
*dev
, struct device_attribute
*attr
,
224 ssize_t
part_fail_store(struct device
*dev
, struct device_attribute
*attr
,
225 const char *buf
, size_t count
);
227 #ifdef CONFIG_FAIL_IO_TIMEOUT
228 int blk_should_fake_timeout(struct request_queue
*);
229 ssize_t
part_timeout_show(struct device
*, struct device_attribute
*, char *);
230 ssize_t
part_timeout_store(struct device
*, struct device_attribute
*,
231 const char *, size_t);
233 static inline int blk_should_fake_timeout(struct request_queue
*q
)
239 void __blk_queue_split(struct request_queue
*q
, struct bio
**bio
,
240 unsigned int *nr_segs
);
241 int ll_back_merge_fn(struct request
*req
, struct bio
*bio
,
242 unsigned int nr_segs
);
243 int ll_front_merge_fn(struct request
*req
, struct bio
*bio
,
244 unsigned int nr_segs
);
245 struct request
*attempt_back_merge(struct request_queue
*q
, struct request
*rq
);
246 struct request
*attempt_front_merge(struct request_queue
*q
, struct request
*rq
);
247 int blk_attempt_req_merge(struct request_queue
*q
, struct request
*rq
,
248 struct request
*next
);
249 unsigned int blk_recalc_rq_segments(struct request
*rq
);
250 void blk_rq_set_mixed_merge(struct request
*rq
);
251 bool blk_rq_merge_ok(struct request
*rq
, struct bio
*bio
);
252 enum elv_merge
blk_try_merge(struct request
*rq
, struct bio
*bio
);
254 int blk_dev_init(void);
257 * Contribute to IO statistics IFF:
259 * a) it's attached to a gendisk, and
260 * b) the queue had IO stats enabled when this request was started
262 static inline bool blk_do_io_stat(struct request
*rq
)
264 return rq
->rq_disk
&& (rq
->rq_flags
& RQF_IO_STAT
);
267 static inline void req_set_nomerge(struct request_queue
*q
, struct request
*req
)
269 req
->cmd_flags
|= REQ_NOMERGE
;
270 if (req
== q
->last_merge
)
271 q
->last_merge
= NULL
;
275 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
276 * is defined as 'unsigned int', meantime it has to aligned to with logical
277 * block size which is the minimum accepted unit by hardware.
279 static inline unsigned int bio_allowed_max_sectors(struct request_queue
*q
)
281 return round_down(UINT_MAX
, queue_logical_block_size(q
)) >> 9;
285 * Internal io_context interface
287 void get_io_context(struct io_context
*ioc
);
288 struct io_cq
*ioc_lookup_icq(struct io_context
*ioc
, struct request_queue
*q
);
289 struct io_cq
*ioc_create_icq(struct io_context
*ioc
, struct request_queue
*q
,
291 void ioc_clear_queue(struct request_queue
*q
);
293 int create_task_io_context(struct task_struct
*task
, gfp_t gfp_mask
, int node
);
296 * Internal throttling interface
298 #ifdef CONFIG_BLK_DEV_THROTTLING
299 extern int blk_throtl_init(struct request_queue
*q
);
300 extern void blk_throtl_exit(struct request_queue
*q
);
301 extern void blk_throtl_register_queue(struct request_queue
*q
);
302 #else /* CONFIG_BLK_DEV_THROTTLING */
303 static inline int blk_throtl_init(struct request_queue
*q
) { return 0; }
304 static inline void blk_throtl_exit(struct request_queue
*q
) { }
305 static inline void blk_throtl_register_queue(struct request_queue
*q
) { }
306 #endif /* CONFIG_BLK_DEV_THROTTLING */
307 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
308 extern ssize_t
blk_throtl_sample_time_show(struct request_queue
*q
, char *page
);
309 extern ssize_t
blk_throtl_sample_time_store(struct request_queue
*q
,
310 const char *page
, size_t count
);
311 extern void blk_throtl_bio_endio(struct bio
*bio
);
312 extern void blk_throtl_stat_add(struct request
*rq
, u64 time
);
314 static inline void blk_throtl_bio_endio(struct bio
*bio
) { }
315 static inline void blk_throtl_stat_add(struct request
*rq
, u64 time
) { }
319 extern int init_emergency_isa_pool(void);
320 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
322 static inline int init_emergency_isa_pool(void)
326 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
329 #endif /* CONFIG_BOUNCE */
331 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
332 extern int blk_iolatency_init(struct request_queue
*q
);
334 static inline int blk_iolatency_init(struct request_queue
*q
) { return 0; }
337 struct bio
*blk_next_bio(struct bio
*bio
, unsigned int nr_pages
, gfp_t gfp
);
339 #ifdef CONFIG_BLK_DEV_ZONED
340 void blk_queue_free_zone_bitmaps(struct request_queue
*q
);
342 static inline void blk_queue_free_zone_bitmaps(struct request_queue
*q
) {}
345 struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
, sector_t sector
);
347 int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
348 void blk_free_devt(dev_t devt
);
349 void blk_invalidate_devt(dev_t devt
);
350 char *disk_name(struct gendisk
*hd
, int partno
, char *buf
);
351 #define ADDPART_FLAG_NONE 0
352 #define ADDPART_FLAG_RAID 1
353 #define ADDPART_FLAG_WHOLEDISK 2
354 void delete_partition(struct gendisk
*disk
, struct hd_struct
*part
);
355 int bdev_add_partition(struct block_device
*bdev
, int partno
,
356 sector_t start
, sector_t length
);
357 int bdev_del_partition(struct block_device
*bdev
, int partno
);
358 int bdev_resize_partition(struct block_device
*bdev
, int partno
,
359 sector_t start
, sector_t length
);
360 int disk_expand_part_tbl(struct gendisk
*disk
, int target
);
361 int hd_ref_init(struct hd_struct
*part
);
363 /* no need to get/put refcount of part0 */
364 static inline int hd_struct_try_get(struct hd_struct
*part
)
367 return percpu_ref_tryget_live(&part
->ref
);
371 static inline void hd_struct_put(struct hd_struct
*part
)
374 percpu_ref_put(&part
->ref
);
377 static inline void hd_free_part(struct hd_struct
*part
)
379 free_percpu(part
->dkstats
);
381 percpu_ref_exit(&part
->ref
);
385 * Any access of part->nr_sects which is not protected by partition
386 * bd_mutex or gendisk bdev bd_mutex, should be done using this
389 * Code written along the lines of i_size_read() and i_size_write().
390 * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
393 static inline sector_t
part_nr_sects_read(struct hd_struct
*part
)
395 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
399 seq
= read_seqcount_begin(&part
->nr_sects_seq
);
400 nr_sects
= part
->nr_sects
;
401 } while (read_seqcount_retry(&part
->nr_sects_seq
, seq
));
403 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
407 nr_sects
= part
->nr_sects
;
411 return part
->nr_sects
;
416 * Should be called with mutex lock held (typically bd_mutex) of partition
417 * to provide mutual exlusion among writers otherwise seqcount might be
418 * left in wrong state leaving the readers spinning infinitely.
420 static inline void part_nr_sects_write(struct hd_struct
*part
, sector_t size
)
422 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
423 write_seqcount_begin(&part
->nr_sects_seq
);
424 part
->nr_sects
= size
;
425 write_seqcount_end(&part
->nr_sects_seq
);
426 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
428 part
->nr_sects
= size
;
431 part
->nr_sects
= size
;
435 struct request_queue
*__blk_alloc_queue(int node_id
);
437 int bio_add_hw_page(struct request_queue
*q
, struct bio
*bio
,
438 struct page
*page
, unsigned int len
, unsigned int offset
,
439 unsigned int max_sectors
, bool *same_page
);
441 #endif /* BLK_INTERNAL_H */