1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/blk-mq.h>
10 /* Max future timer expiry for timeouts */
11 #define BLK_MAX_TIMEOUT (5 * HZ)
13 #ifdef CONFIG_DEBUG_FS
14 extern struct dentry
*blk_debugfs_root
;
17 struct blk_flush_queue
{
18 unsigned int flush_queue_delayed
:1;
19 unsigned int flush_pending_idx
:1;
20 unsigned int flush_running_idx
:1;
21 unsigned long flush_pending_since
;
22 struct list_head flush_queue
[2];
23 struct list_head flush_data_in_flight
;
24 struct request
*flush_rq
;
27 * flush_rq shares tag with this rq, both can't be active
30 struct request
*orig_rq
;
31 spinlock_t mq_flush_lock
;
34 extern struct kmem_cache
*blk_requestq_cachep
;
35 extern struct kobj_type blk_queue_ktype
;
36 extern struct ida blk_queue_ida
;
38 static inline struct blk_flush_queue
*
39 blk_get_flush_queue(struct request_queue
*q
, struct blk_mq_ctx
*ctx
)
41 return blk_mq_map_queue(q
, REQ_OP_FLUSH
, ctx
)->fq
;
44 static inline void __blk_get_queue(struct request_queue
*q
)
46 kobject_get(&q
->kobj
);
49 struct blk_flush_queue
*blk_alloc_flush_queue(struct request_queue
*q
,
50 int node
, int cmd_size
, gfp_t flags
);
51 void blk_free_flush_queue(struct blk_flush_queue
*q
);
53 void blk_rq_bio_prep(struct request_queue
*q
, struct request
*rq
,
55 void blk_freeze_queue(struct request_queue
*q
);
57 static inline void blk_queue_enter_live(struct request_queue
*q
)
60 * Given that running in generic_make_request() context
61 * guarantees that a live reference against q_usage_counter has
62 * been established, further references under that same context
63 * need not check that the queue has been frozen (marked dead).
65 percpu_ref_get(&q
->q_usage_counter
);
68 static inline bool biovec_phys_mergeable(struct request_queue
*q
,
69 struct bio_vec
*vec1
, struct bio_vec
*vec2
)
71 unsigned long mask
= queue_segment_boundary(q
);
72 phys_addr_t addr1
= page_to_phys(vec1
->bv_page
) + vec1
->bv_offset
;
73 phys_addr_t addr2
= page_to_phys(vec2
->bv_page
) + vec2
->bv_offset
;
75 if (addr1
+ vec1
->bv_len
!= addr2
)
77 if (xen_domain() && !xen_biovec_phys_mergeable(vec1
, vec2
->bv_page
))
79 if ((addr1
| mask
) != ((addr2
+ vec2
->bv_len
- 1) | mask
))
84 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
85 struct bio_vec
*bprv
, unsigned int offset
)
87 return (offset
& queue_virt_boundary(q
)) ||
88 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
92 * Check if adding a bio_vec after bprv with offset would create a gap in
93 * the SG list. Most drivers don't care about this, but some do.
95 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
96 struct bio_vec
*bprv
, unsigned int offset
)
98 if (!queue_virt_boundary(q
))
100 return __bvec_gap_to_prev(q
, bprv
, offset
);
103 #ifdef CONFIG_BLK_DEV_INTEGRITY
104 void blk_flush_integrity(void);
105 bool __bio_integrity_endio(struct bio
*);
106 static inline bool bio_integrity_endio(struct bio
*bio
)
108 if (bio_integrity(bio
))
109 return __bio_integrity_endio(bio
);
113 static inline bool integrity_req_gap_back_merge(struct request
*req
,
116 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
117 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
119 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
120 bip_next
->bip_vec
[0].bv_offset
);
123 static inline bool integrity_req_gap_front_merge(struct request
*req
,
126 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
127 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
129 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
130 bip_next
->bip_vec
[0].bv_offset
);
132 #else /* CONFIG_BLK_DEV_INTEGRITY */
133 static inline bool integrity_req_gap_back_merge(struct request
*req
,
138 static inline bool integrity_req_gap_front_merge(struct request
*req
,
144 static inline void blk_flush_integrity(void)
147 static inline bool bio_integrity_endio(struct bio
*bio
)
151 #endif /* CONFIG_BLK_DEV_INTEGRITY */
153 unsigned long blk_rq_timeout(unsigned long timeout
);
154 void blk_add_timer(struct request
*req
);
156 bool bio_attempt_front_merge(struct request_queue
*q
, struct request
*req
,
158 bool bio_attempt_back_merge(struct request_queue
*q
, struct request
*req
,
160 bool bio_attempt_discard_merge(struct request_queue
*q
, struct request
*req
,
162 bool blk_attempt_plug_merge(struct request_queue
*q
, struct bio
*bio
,
163 struct request
**same_queue_rq
);
165 void blk_account_io_start(struct request
*req
, bool new_io
);
166 void blk_account_io_completion(struct request
*req
, unsigned int bytes
);
167 void blk_account_io_done(struct request
*req
, u64 now
);
170 * Internal elevator interface
172 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
174 void blk_insert_flush(struct request
*rq
);
176 int elevator_init_mq(struct request_queue
*q
);
177 int elevator_switch_mq(struct request_queue
*q
,
178 struct elevator_type
*new_e
);
179 void elevator_exit(struct request_queue
*, struct elevator_queue
*);
180 int elv_register_queue(struct request_queue
*q
);
181 void elv_unregister_queue(struct request_queue
*q
);
183 struct hd_struct
*__disk_get_part(struct gendisk
*disk
, int partno
);
185 #ifdef CONFIG_FAIL_IO_TIMEOUT
186 int blk_should_fake_timeout(struct request_queue
*);
187 ssize_t
part_timeout_show(struct device
*, struct device_attribute
*, char *);
188 ssize_t
part_timeout_store(struct device
*, struct device_attribute
*,
189 const char *, size_t);
191 static inline int blk_should_fake_timeout(struct request_queue
*q
)
197 int ll_back_merge_fn(struct request_queue
*q
, struct request
*req
,
199 int ll_front_merge_fn(struct request_queue
*q
, struct request
*req
,
201 struct request
*attempt_back_merge(struct request_queue
*q
, struct request
*rq
);
202 struct request
*attempt_front_merge(struct request_queue
*q
, struct request
*rq
);
203 int blk_attempt_req_merge(struct request_queue
*q
, struct request
*rq
,
204 struct request
*next
);
205 void blk_recalc_rq_segments(struct request
*rq
);
206 void blk_rq_set_mixed_merge(struct request
*rq
);
207 bool blk_rq_merge_ok(struct request
*rq
, struct bio
*bio
);
208 enum elv_merge
blk_try_merge(struct request
*rq
, struct bio
*bio
);
210 int blk_dev_init(void);
213 * Contribute to IO statistics IFF:
215 * a) it's attached to a gendisk, and
216 * b) the queue had IO stats enabled when this request was started, and
217 * c) it's a file system request
219 static inline bool blk_do_io_stat(struct request
*rq
)
221 return rq
->rq_disk
&&
222 (rq
->rq_flags
& RQF_IO_STAT
) &&
223 !blk_rq_is_passthrough(rq
);
226 static inline void req_set_nomerge(struct request_queue
*q
, struct request
*req
)
228 req
->cmd_flags
|= REQ_NOMERGE
;
229 if (req
== q
->last_merge
)
230 q
->last_merge
= NULL
;
234 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
235 * is defined as 'unsigned int', meantime it has to aligned to with logical
236 * block size which is the minimum accepted unit by hardware.
238 static inline unsigned int bio_allowed_max_sectors(struct request_queue
*q
)
240 return round_down(UINT_MAX
, queue_logical_block_size(q
)) >> 9;
244 * Internal io_context interface
246 void get_io_context(struct io_context
*ioc
);
247 struct io_cq
*ioc_lookup_icq(struct io_context
*ioc
, struct request_queue
*q
);
248 struct io_cq
*ioc_create_icq(struct io_context
*ioc
, struct request_queue
*q
,
250 void ioc_clear_queue(struct request_queue
*q
);
252 int create_task_io_context(struct task_struct
*task
, gfp_t gfp_mask
, int node
);
255 * create_io_context - try to create task->io_context
256 * @gfp_mask: allocation mask
257 * @node: allocation node
259 * If %current->io_context is %NULL, allocate a new io_context and install
260 * it. Returns the current %current->io_context which may be %NULL if
263 * Note that this function can't be called with IRQ disabled because
264 * task_lock which protects %current->io_context is IRQ-unsafe.
266 static inline struct io_context
*create_io_context(gfp_t gfp_mask
, int node
)
268 WARN_ON_ONCE(irqs_disabled());
269 if (unlikely(!current
->io_context
))
270 create_task_io_context(current
, gfp_mask
, node
);
271 return current
->io_context
;
275 * Internal throttling interface
277 #ifdef CONFIG_BLK_DEV_THROTTLING
278 extern void blk_throtl_drain(struct request_queue
*q
);
279 extern int blk_throtl_init(struct request_queue
*q
);
280 extern void blk_throtl_exit(struct request_queue
*q
);
281 extern void blk_throtl_register_queue(struct request_queue
*q
);
282 #else /* CONFIG_BLK_DEV_THROTTLING */
283 static inline void blk_throtl_drain(struct request_queue
*q
) { }
284 static inline int blk_throtl_init(struct request_queue
*q
) { return 0; }
285 static inline void blk_throtl_exit(struct request_queue
*q
) { }
286 static inline void blk_throtl_register_queue(struct request_queue
*q
) { }
287 #endif /* CONFIG_BLK_DEV_THROTTLING */
288 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
289 extern ssize_t
blk_throtl_sample_time_show(struct request_queue
*q
, char *page
);
290 extern ssize_t
blk_throtl_sample_time_store(struct request_queue
*q
,
291 const char *page
, size_t count
);
292 extern void blk_throtl_bio_endio(struct bio
*bio
);
293 extern void blk_throtl_stat_add(struct request
*rq
, u64 time
);
295 static inline void blk_throtl_bio_endio(struct bio
*bio
) { }
296 static inline void blk_throtl_stat_add(struct request
*rq
, u64 time
) { }
300 extern int init_emergency_isa_pool(void);
301 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
303 static inline int init_emergency_isa_pool(void)
307 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
310 #endif /* CONFIG_BOUNCE */
312 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
313 extern int blk_iolatency_init(struct request_queue
*q
);
315 static inline int blk_iolatency_init(struct request_queue
*q
) { return 0; }
318 struct bio
*blk_next_bio(struct bio
*bio
, unsigned int nr_pages
, gfp_t gfp
);
320 #ifdef CONFIG_BLK_DEV_ZONED
321 void blk_queue_free_zone_bitmaps(struct request_queue
*q
);
323 static inline void blk_queue_free_zone_bitmaps(struct request_queue
*q
) {}
326 #endif /* BLK_INTERNAL_H */