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 struct lock_class_key key
;
29 spinlock_t mq_flush_lock
;
32 extern struct kmem_cache
*blk_requestq_cachep
;
33 extern struct kobj_type blk_queue_ktype
;
34 extern struct ida blk_queue_ida
;
36 static inline struct blk_flush_queue
*
37 blk_get_flush_queue(struct request_queue
*q
, struct blk_mq_ctx
*ctx
)
39 return blk_mq_map_queue(q
, REQ_OP_FLUSH
, ctx
)->fq
;
42 static inline void __blk_get_queue(struct request_queue
*q
)
44 kobject_get(&q
->kobj
);
48 is_flush_rq(struct request
*req
, struct blk_mq_hw_ctx
*hctx
)
50 return hctx
->fq
->flush_rq
== req
;
53 struct blk_flush_queue
*blk_alloc_flush_queue(int node
, int cmd_size
,
55 void blk_free_flush_queue(struct blk_flush_queue
*q
);
57 void blk_freeze_queue(struct request_queue
*q
);
59 static inline bool biovec_phys_mergeable(struct request_queue
*q
,
60 struct bio_vec
*vec1
, struct bio_vec
*vec2
)
62 unsigned long mask
= queue_segment_boundary(q
);
63 phys_addr_t addr1
= page_to_phys(vec1
->bv_page
) + vec1
->bv_offset
;
64 phys_addr_t addr2
= page_to_phys(vec2
->bv_page
) + vec2
->bv_offset
;
66 if (addr1
+ vec1
->bv_len
!= addr2
)
68 if (xen_domain() && !xen_biovec_phys_mergeable(vec1
, vec2
->bv_page
))
70 if ((addr1
| mask
) != ((addr2
+ vec2
->bv_len
- 1) | mask
))
75 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
76 struct bio_vec
*bprv
, unsigned int offset
)
78 return (offset
& queue_virt_boundary(q
)) ||
79 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
83 * Check if adding a bio_vec after bprv with offset would create a gap in
84 * the SG list. Most drivers don't care about this, but some do.
86 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
87 struct bio_vec
*bprv
, unsigned int offset
)
89 if (!queue_virt_boundary(q
))
91 return __bvec_gap_to_prev(q
, bprv
, offset
);
94 static inline void blk_rq_bio_prep(struct request
*rq
, struct bio
*bio
,
97 rq
->nr_phys_segments
= nr_segs
;
98 rq
->__data_len
= bio
->bi_iter
.bi_size
;
99 rq
->bio
= rq
->biotail
= bio
;
100 rq
->ioprio
= bio_prio(bio
);
103 rq
->rq_disk
= bio
->bi_disk
;
106 #ifdef CONFIG_BLK_DEV_INTEGRITY
107 void blk_flush_integrity(void);
108 bool __bio_integrity_endio(struct bio
*);
109 void bio_integrity_free(struct bio
*bio
);
110 static inline bool bio_integrity_endio(struct bio
*bio
)
112 if (bio_integrity(bio
))
113 return __bio_integrity_endio(bio
);
117 bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
119 bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
122 static inline bool integrity_req_gap_back_merge(struct request
*req
,
125 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
126 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
128 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
129 bip_next
->bip_vec
[0].bv_offset
);
132 static inline bool integrity_req_gap_front_merge(struct request
*req
,
135 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
136 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
138 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
139 bip_next
->bip_vec
[0].bv_offset
);
142 void blk_integrity_add(struct gendisk
*);
143 void blk_integrity_del(struct gendisk
*);
144 #else /* CONFIG_BLK_DEV_INTEGRITY */
145 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
146 struct request
*r1
, struct request
*r2
)
150 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
151 struct request
*r
, struct bio
*b
)
155 static inline bool integrity_req_gap_back_merge(struct request
*req
,
160 static inline bool integrity_req_gap_front_merge(struct request
*req
,
166 static inline void blk_flush_integrity(void)
169 static inline bool bio_integrity_endio(struct bio
*bio
)
173 static inline void bio_integrity_free(struct bio
*bio
)
176 static inline void blk_integrity_add(struct gendisk
*disk
)
179 static inline void blk_integrity_del(struct gendisk
*disk
)
182 #endif /* CONFIG_BLK_DEV_INTEGRITY */
184 unsigned long blk_rq_timeout(unsigned long timeout
);
185 void blk_add_timer(struct request
*req
);
187 bool blk_attempt_plug_merge(struct request_queue
*q
, struct bio
*bio
,
188 unsigned int nr_segs
, struct request
**same_queue_rq
);
189 bool blk_bio_list_merge(struct request_queue
*q
, struct list_head
*list
,
190 struct bio
*bio
, unsigned int nr_segs
);
192 void blk_account_io_start(struct request
*req
);
193 void blk_account_io_done(struct request
*req
, u64 now
);
196 * Internal elevator interface
198 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
200 void blk_insert_flush(struct request
*rq
);
202 void elevator_init_mq(struct request_queue
*q
);
203 int elevator_switch_mq(struct request_queue
*q
,
204 struct elevator_type
*new_e
);
205 void __elevator_exit(struct request_queue
*, struct elevator_queue
*);
206 int elv_register_queue(struct request_queue
*q
, bool uevent
);
207 void elv_unregister_queue(struct request_queue
*q
);
209 static inline void elevator_exit(struct request_queue
*q
,
210 struct elevator_queue
*e
)
212 lockdep_assert_held(&q
->sysfs_lock
);
214 blk_mq_sched_free_requests(q
);
215 __elevator_exit(q
, e
);
218 struct hd_struct
*__disk_get_part(struct gendisk
*disk
, int partno
);
220 ssize_t
part_size_show(struct device
*dev
, struct device_attribute
*attr
,
222 ssize_t
part_stat_show(struct device
*dev
, struct device_attribute
*attr
,
224 ssize_t
part_inflight_show(struct device
*dev
, struct device_attribute
*attr
,
226 ssize_t
part_fail_show(struct device
*dev
, struct device_attribute
*attr
,
228 ssize_t
part_fail_store(struct device
*dev
, struct device_attribute
*attr
,
229 const char *buf
, size_t count
);
230 ssize_t
part_timeout_show(struct device
*, struct device_attribute
*, char *);
231 ssize_t
part_timeout_store(struct device
*, struct device_attribute
*,
232 const char *, size_t);
234 void __blk_queue_split(struct bio
**bio
, unsigned int *nr_segs
);
235 int ll_back_merge_fn(struct request
*req
, struct bio
*bio
,
236 unsigned int nr_segs
);
237 int blk_attempt_req_merge(struct request_queue
*q
, struct request
*rq
,
238 struct request
*next
);
239 unsigned int blk_recalc_rq_segments(struct request
*rq
);
240 void blk_rq_set_mixed_merge(struct request
*rq
);
241 bool blk_rq_merge_ok(struct request
*rq
, struct bio
*bio
);
242 enum elv_merge
blk_try_merge(struct request
*rq
, struct bio
*bio
);
244 int blk_dev_init(void);
247 * Contribute to IO statistics IFF:
249 * a) it's attached to a gendisk, and
250 * b) the queue had IO stats enabled when this request was started
252 static inline bool blk_do_io_stat(struct request
*rq
)
254 return rq
->rq_disk
&& (rq
->rq_flags
& RQF_IO_STAT
);
257 static inline void req_set_nomerge(struct request_queue
*q
, struct request
*req
)
259 req
->cmd_flags
|= REQ_NOMERGE
;
260 if (req
== q
->last_merge
)
261 q
->last_merge
= NULL
;
265 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
266 * is defined as 'unsigned int', meantime it has to aligned to with logical
267 * block size which is the minimum accepted unit by hardware.
269 static inline unsigned int bio_allowed_max_sectors(struct request_queue
*q
)
271 return round_down(UINT_MAX
, queue_logical_block_size(q
)) >> 9;
275 * The max bio size which is aligned to q->limits.discard_granularity. This
276 * is a hint to split large discard bio in generic block layer, then if device
277 * driver needs to split the discard bio into smaller ones, their bi_size can
278 * be very probably and easily aligned to discard_granularity of the device's
281 static inline unsigned int bio_aligned_discard_max_sectors(
282 struct request_queue
*q
)
284 return round_down(UINT_MAX
, q
->limits
.discard_granularity
) >>
289 * Internal io_context interface
291 void get_io_context(struct io_context
*ioc
);
292 struct io_cq
*ioc_lookup_icq(struct io_context
*ioc
, struct request_queue
*q
);
293 struct io_cq
*ioc_create_icq(struct io_context
*ioc
, struct request_queue
*q
,
295 void ioc_clear_queue(struct request_queue
*q
);
297 int create_task_io_context(struct task_struct
*task
, gfp_t gfp_mask
, int node
);
300 * Internal throttling interface
302 #ifdef CONFIG_BLK_DEV_THROTTLING
303 extern int blk_throtl_init(struct request_queue
*q
);
304 extern void blk_throtl_exit(struct request_queue
*q
);
305 extern void blk_throtl_register_queue(struct request_queue
*q
);
306 bool blk_throtl_bio(struct bio
*bio
);
307 #else /* CONFIG_BLK_DEV_THROTTLING */
308 static inline int blk_throtl_init(struct request_queue
*q
) { return 0; }
309 static inline void blk_throtl_exit(struct request_queue
*q
) { }
310 static inline void blk_throtl_register_queue(struct request_queue
*q
) { }
311 static inline bool blk_throtl_bio(struct bio
*bio
) { return false; }
312 #endif /* CONFIG_BLK_DEV_THROTTLING */
313 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
314 extern ssize_t
blk_throtl_sample_time_show(struct request_queue
*q
, char *page
);
315 extern ssize_t
blk_throtl_sample_time_store(struct request_queue
*q
,
316 const char *page
, size_t count
);
317 extern void blk_throtl_bio_endio(struct bio
*bio
);
318 extern void blk_throtl_stat_add(struct request
*rq
, u64 time
);
320 static inline void blk_throtl_bio_endio(struct bio
*bio
) { }
321 static inline void blk_throtl_stat_add(struct request
*rq
, u64 time
) { }
325 extern int init_emergency_isa_pool(void);
326 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
328 static inline int init_emergency_isa_pool(void)
332 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
335 #endif /* CONFIG_BOUNCE */
337 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
338 extern int blk_iolatency_init(struct request_queue
*q
);
340 static inline int blk_iolatency_init(struct request_queue
*q
) { return 0; }
343 struct bio
*blk_next_bio(struct bio
*bio
, unsigned int nr_pages
, gfp_t gfp
);
345 #ifdef CONFIG_BLK_DEV_ZONED
346 void blk_queue_free_zone_bitmaps(struct request_queue
*q
);
348 static inline void blk_queue_free_zone_bitmaps(struct request_queue
*q
) {}
351 struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
, sector_t sector
);
353 int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
354 void blk_free_devt(dev_t devt
);
355 void blk_invalidate_devt(dev_t devt
);
356 char *disk_name(struct gendisk
*hd
, int partno
, char *buf
);
357 #define ADDPART_FLAG_NONE 0
358 #define ADDPART_FLAG_RAID 1
359 #define ADDPART_FLAG_WHOLEDISK 2
360 void delete_partition(struct hd_struct
*part
);
361 int bdev_add_partition(struct block_device
*bdev
, int partno
,
362 sector_t start
, sector_t length
);
363 int bdev_del_partition(struct block_device
*bdev
, int partno
);
364 int bdev_resize_partition(struct block_device
*bdev
, int partno
,
365 sector_t start
, sector_t length
);
366 int disk_expand_part_tbl(struct gendisk
*disk
, int target
);
367 int hd_ref_init(struct hd_struct
*part
);
369 /* no need to get/put refcount of part0 */
370 static inline int hd_struct_try_get(struct hd_struct
*part
)
373 return percpu_ref_tryget_live(&part
->ref
);
377 static inline void hd_struct_put(struct hd_struct
*part
)
380 percpu_ref_put(&part
->ref
);
383 static inline void hd_free_part(struct hd_struct
*part
)
385 free_percpu(part
->dkstats
);
387 percpu_ref_exit(&part
->ref
);
391 * Any access of part->nr_sects which is not protected by partition
392 * bd_mutex or gendisk bdev bd_mutex, should be done using this
395 * Code written along the lines of i_size_read() and i_size_write().
396 * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
399 static inline sector_t
part_nr_sects_read(struct hd_struct
*part
)
401 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
405 seq
= read_seqcount_begin(&part
->nr_sects_seq
);
406 nr_sects
= part
->nr_sects
;
407 } while (read_seqcount_retry(&part
->nr_sects_seq
, seq
));
409 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
413 nr_sects
= part
->nr_sects
;
417 return part
->nr_sects
;
422 * Should be called with mutex lock held (typically bd_mutex) of partition
423 * to provide mutual exlusion among writers otherwise seqcount might be
424 * left in wrong state leaving the readers spinning infinitely.
426 static inline void part_nr_sects_write(struct hd_struct
*part
, sector_t size
)
428 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
430 write_seqcount_begin(&part
->nr_sects_seq
);
431 part
->nr_sects
= size
;
432 write_seqcount_end(&part
->nr_sects_seq
);
434 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
436 part
->nr_sects
= size
;
439 part
->nr_sects
= size
;
443 int bio_add_hw_page(struct request_queue
*q
, struct bio
*bio
,
444 struct page
*page
, unsigned int len
, unsigned int offset
,
445 unsigned int max_sectors
, bool *same_page
);
447 #endif /* BLK_INTERNAL_H */