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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
8324aa91 JA |
2 | #ifndef BLK_INTERNAL_H |
3 | #define BLK_INTERNAL_H | |
4 | ||
a73f730d | 5 | #include <linux/idr.h> |
f70ced09 ML |
6 | #include <linux/blk-mq.h> |
7 | #include "blk-mq.h" | |
a73f730d | 8 | |
86db1e29 JA |
9 | /* Amount of time in which a process may batch requests */ |
10 | #define BLK_BATCH_TIME (HZ/50UL) | |
11 | ||
12 | /* Number of requests a "batching" process may submit */ | |
13 | #define BLK_BATCH_REQ 32 | |
14 | ||
0d2602ca JA |
15 | /* Max future timer expiry for timeouts */ |
16 | #define BLK_MAX_TIMEOUT (5 * HZ) | |
17 | ||
18fbda91 OS |
18 | #ifdef CONFIG_DEBUG_FS |
19 | extern struct dentry *blk_debugfs_root; | |
20 | #endif | |
21 | ||
7c94e1c1 ML |
22 | struct blk_flush_queue { |
23 | unsigned int flush_queue_delayed:1; | |
24 | unsigned int flush_pending_idx:1; | |
25 | unsigned int flush_running_idx:1; | |
26 | unsigned long flush_pending_since; | |
27 | struct list_head flush_queue[2]; | |
28 | struct list_head flush_data_in_flight; | |
29 | struct request *flush_rq; | |
0048b483 ML |
30 | |
31 | /* | |
32 | * flush_rq shares tag with this rq, both can't be active | |
33 | * at the same time | |
34 | */ | |
35 | struct request *orig_rq; | |
7c94e1c1 ML |
36 | spinlock_t mq_flush_lock; |
37 | }; | |
38 | ||
8324aa91 | 39 | extern struct kmem_cache *blk_requestq_cachep; |
320ae51f | 40 | extern struct kmem_cache *request_cachep; |
8324aa91 | 41 | extern struct kobj_type blk_queue_ktype; |
a73f730d | 42 | extern struct ida blk_queue_ida; |
8324aa91 | 43 | |
7c94e1c1 | 44 | static inline struct blk_flush_queue *blk_get_flush_queue( |
e97c293c | 45 | struct request_queue *q, struct blk_mq_ctx *ctx) |
7c94e1c1 | 46 | { |
7d7e0f90 CH |
47 | if (q->mq_ops) |
48 | return blk_mq_map_queue(q, ctx->cpu)->fq; | |
49 | return q->fq; | |
7c94e1c1 ML |
50 | } |
51 | ||
09ac46c4 TH |
52 | static inline void __blk_get_queue(struct request_queue *q) |
53 | { | |
54 | kobject_get(&q->kobj); | |
55 | } | |
56 | ||
f70ced09 ML |
57 | struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, |
58 | int node, int cmd_size); | |
59 | void blk_free_flush_queue(struct blk_flush_queue *q); | |
f3552655 | 60 | |
5b788ce3 TH |
61 | int blk_init_rl(struct request_list *rl, struct request_queue *q, |
62 | gfp_t gfp_mask); | |
b425e504 | 63 | void blk_exit_rl(struct request_queue *q, struct request_list *rl); |
86db1e29 JA |
64 | void blk_rq_bio_prep(struct request_queue *q, struct request *rq, |
65 | struct bio *bio); | |
d732580b TH |
66 | void blk_queue_bypass_start(struct request_queue *q); |
67 | void blk_queue_bypass_end(struct request_queue *q); | |
8324aa91 | 68 | void __blk_queue_free_tags(struct request_queue *q); |
3ef28e83 DW |
69 | void blk_freeze_queue(struct request_queue *q); |
70 | ||
71 | static inline void blk_queue_enter_live(struct request_queue *q) | |
72 | { | |
73 | /* | |
74 | * Given that running in generic_make_request() context | |
75 | * guarantees that a live reference against q_usage_counter has | |
76 | * been established, further references under that same context | |
77 | * need not check that the queue has been frozen (marked dead). | |
78 | */ | |
79 | percpu_ref_get(&q->q_usage_counter); | |
80 | } | |
8324aa91 | 81 | |
5a48fc14 DW |
82 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
83 | void blk_flush_integrity(void); | |
7c20f116 CH |
84 | bool __bio_integrity_endio(struct bio *); |
85 | static inline bool bio_integrity_endio(struct bio *bio) | |
86 | { | |
87 | if (bio_integrity(bio)) | |
88 | return __bio_integrity_endio(bio); | |
89 | return true; | |
90 | } | |
5a48fc14 DW |
91 | #else |
92 | static inline void blk_flush_integrity(void) | |
93 | { | |
94 | } | |
7c20f116 CH |
95 | static inline bool bio_integrity_endio(struct bio *bio) |
96 | { | |
97 | return true; | |
98 | } | |
5a48fc14 | 99 | #endif |
8324aa91 | 100 | |
287922eb | 101 | void blk_timeout_work(struct work_struct *work); |
0d2602ca | 102 | unsigned long blk_rq_timeout(unsigned long timeout); |
87ee7b11 | 103 | void blk_add_timer(struct request *req); |
242f9dcb | 104 | void blk_delete_timer(struct request *); |
242f9dcb | 105 | |
320ae51f JA |
106 | |
107 | bool bio_attempt_front_merge(struct request_queue *q, struct request *req, | |
108 | struct bio *bio); | |
109 | bool bio_attempt_back_merge(struct request_queue *q, struct request *req, | |
110 | struct bio *bio); | |
1e739730 CH |
111 | bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, |
112 | struct bio *bio); | |
320ae51f | 113 | bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
5b3f341f SL |
114 | unsigned int *request_count, |
115 | struct request **same_queue_rq); | |
0809e3ac | 116 | unsigned int blk_plug_queued_count(struct request_queue *q); |
320ae51f JA |
117 | |
118 | void blk_account_io_start(struct request *req, bool new_io); | |
119 | void blk_account_io_completion(struct request *req, unsigned int bytes); | |
120 | void blk_account_io_done(struct request *req); | |
121 | ||
242f9dcb JA |
122 | /* |
123 | * Internal atomic flags for request handling | |
124 | */ | |
125 | enum rq_atomic_flags { | |
126 | REQ_ATOM_COMPLETE = 0, | |
127 | }; | |
128 | ||
129 | /* | |
130 | * EH timer and IO completion will both attempt to 'grab' the request, make | |
25985edc | 131 | * sure that only one of them succeeds |
242f9dcb JA |
132 | */ |
133 | static inline int blk_mark_rq_complete(struct request *rq) | |
134 | { | |
135 | return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
136 | } | |
137 | ||
138 | static inline void blk_clear_rq_complete(struct request *rq) | |
139 | { | |
140 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
141 | } | |
86db1e29 | 142 | |
158dbda0 TH |
143 | /* |
144 | * Internal elevator interface | |
145 | */ | |
e8064021 | 146 | #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) |
158dbda0 | 147 | |
ae1b1539 | 148 | void blk_insert_flush(struct request *rq); |
dd831006 | 149 | |
158dbda0 TH |
150 | static inline void elv_activate_rq(struct request_queue *q, struct request *rq) |
151 | { | |
152 | struct elevator_queue *e = q->elevator; | |
153 | ||
c51ca6cf JA |
154 | if (e->type->ops.sq.elevator_activate_req_fn) |
155 | e->type->ops.sq.elevator_activate_req_fn(q, rq); | |
158dbda0 TH |
156 | } |
157 | ||
158 | static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq) | |
159 | { | |
160 | struct elevator_queue *e = q->elevator; | |
161 | ||
c51ca6cf JA |
162 | if (e->type->ops.sq.elevator_deactivate_req_fn) |
163 | e->type->ops.sq.elevator_deactivate_req_fn(q, rq); | |
158dbda0 TH |
164 | } |
165 | ||
807d4af2 CH |
166 | struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
167 | ||
581d4e28 JA |
168 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
169 | int blk_should_fake_timeout(struct request_queue *); | |
170 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
171 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
172 | const char *, size_t); | |
173 | #else | |
174 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
175 | { | |
176 | return 0; | |
177 | } | |
178 | #endif | |
179 | ||
d6d48196 JA |
180 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
181 | struct bio *bio); | |
182 | int ll_front_merge_fn(struct request_queue *q, struct request *req, | |
183 | struct bio *bio); | |
b973cb7e JA |
184 | struct request *attempt_back_merge(struct request_queue *q, struct request *rq); |
185 | struct request *attempt_front_merge(struct request_queue *q, struct request *rq); | |
5e84ea3a JA |
186 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
187 | struct request *next); | |
d6d48196 | 188 | void blk_recalc_rq_segments(struct request *rq); |
80a761fd | 189 | void blk_rq_set_mixed_merge(struct request *rq); |
050c8ea8 | 190 | bool blk_rq_merge_ok(struct request *rq, struct bio *bio); |
34fe7c05 | 191 | enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); |
d6d48196 | 192 | |
8324aa91 JA |
193 | void blk_queue_congestion_threshold(struct request_queue *q); |
194 | ||
ff88972c AB |
195 | int blk_dev_init(void); |
196 | ||
f253b86b | 197 | |
8324aa91 JA |
198 | /* |
199 | * Return the threshold (number of used requests) at which the queue is | |
200 | * considered to be congested. It include a little hysteresis to keep the | |
201 | * context switch rate down. | |
202 | */ | |
203 | static inline int queue_congestion_on_threshold(struct request_queue *q) | |
204 | { | |
205 | return q->nr_congestion_on; | |
206 | } | |
207 | ||
208 | /* | |
209 | * The threshold at which a queue is considered to be uncongested | |
210 | */ | |
211 | static inline int queue_congestion_off_threshold(struct request_queue *q) | |
212 | { | |
213 | return q->nr_congestion_off; | |
214 | } | |
215 | ||
e3a2b3f9 JA |
216 | extern int blk_update_nr_requests(struct request_queue *, unsigned int); |
217 | ||
c2553b58 JA |
218 | /* |
219 | * Contribute to IO statistics IFF: | |
220 | * | |
221 | * a) it's attached to a gendisk, and | |
222 | * b) the queue had IO stats enabled when this request was started, and | |
e2a60da7 | 223 | * c) it's a file system request |
c2553b58 | 224 | */ |
26308eab | 225 | static inline int blk_do_io_stat(struct request *rq) |
fb8ec18c | 226 | { |
33659ebb | 227 | return rq->rq_disk && |
e8064021 | 228 | (rq->rq_flags & RQF_IO_STAT) && |
57292b58 | 229 | !blk_rq_is_passthrough(rq); |
fb8ec18c JA |
230 | } |
231 | ||
6cf7677f CH |
232 | static inline void req_set_nomerge(struct request_queue *q, struct request *req) |
233 | { | |
234 | req->cmd_flags |= REQ_NOMERGE; | |
235 | if (req == q->last_merge) | |
236 | q->last_merge = NULL; | |
237 | } | |
238 | ||
f2dbd76a TH |
239 | /* |
240 | * Internal io_context interface | |
241 | */ | |
242 | void get_io_context(struct io_context *ioc); | |
47fdd4ca | 243 | struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); |
24acfc34 TH |
244 | struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, |
245 | gfp_t gfp_mask); | |
7e5a8794 | 246 | void ioc_clear_queue(struct request_queue *q); |
f2dbd76a | 247 | |
24acfc34 | 248 | int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); |
f2dbd76a | 249 | |
c23ecb42 JA |
250 | /** |
251 | * rq_ioc - determine io_context for request allocation | |
252 | * @bio: request being allocated is for this bio (can be %NULL) | |
253 | * | |
254 | * Determine io_context to use for request allocation for @bio. May return | |
255 | * %NULL if %current->io_context doesn't exist. | |
256 | */ | |
257 | static inline struct io_context *rq_ioc(struct bio *bio) | |
258 | { | |
259 | #ifdef CONFIG_BLK_CGROUP | |
260 | if (bio && bio->bi_ioc) | |
261 | return bio->bi_ioc; | |
262 | #endif | |
263 | return current->io_context; | |
264 | } | |
265 | ||
f2dbd76a TH |
266 | /** |
267 | * create_io_context - try to create task->io_context | |
f2dbd76a TH |
268 | * @gfp_mask: allocation mask |
269 | * @node: allocation node | |
270 | * | |
24acfc34 TH |
271 | * If %current->io_context is %NULL, allocate a new io_context and install |
272 | * it. Returns the current %current->io_context which may be %NULL if | |
273 | * allocation failed. | |
f2dbd76a TH |
274 | * |
275 | * Note that this function can't be called with IRQ disabled because | |
24acfc34 | 276 | * task_lock which protects %current->io_context is IRQ-unsafe. |
f2dbd76a | 277 | */ |
24acfc34 | 278 | static inline struct io_context *create_io_context(gfp_t gfp_mask, int node) |
f2dbd76a TH |
279 | { |
280 | WARN_ON_ONCE(irqs_disabled()); | |
24acfc34 TH |
281 | if (unlikely(!current->io_context)) |
282 | create_task_io_context(current, gfp_mask, node); | |
283 | return current->io_context; | |
f2dbd76a TH |
284 | } |
285 | ||
286 | /* | |
287 | * Internal throttling interface | |
288 | */ | |
bc9fcbf9 | 289 | #ifdef CONFIG_BLK_DEV_THROTTLING |
c9a929dd | 290 | extern void blk_throtl_drain(struct request_queue *q); |
bc9fcbf9 TH |
291 | extern int blk_throtl_init(struct request_queue *q); |
292 | extern void blk_throtl_exit(struct request_queue *q); | |
d61fcfa4 | 293 | extern void blk_throtl_register_queue(struct request_queue *q); |
bc9fcbf9 | 294 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
c9a929dd | 295 | static inline void blk_throtl_drain(struct request_queue *q) { } |
bc9fcbf9 TH |
296 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
297 | static inline void blk_throtl_exit(struct request_queue *q) { } | |
d61fcfa4 | 298 | static inline void blk_throtl_register_queue(struct request_queue *q) { } |
bc9fcbf9 | 299 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
297e3d85 SL |
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); | |
9e234eea | 304 | extern void blk_throtl_bio_endio(struct bio *bio); |
b9147dd1 | 305 | extern void blk_throtl_stat_add(struct request *rq, u64 time); |
9e234eea SL |
306 | #else |
307 | static inline void blk_throtl_bio_endio(struct bio *bio) { } | |
b9147dd1 | 308 | static inline void blk_throtl_stat_add(struct request *rq, u64 time) { } |
297e3d85 | 309 | #endif |
bc9fcbf9 | 310 | |
3bce016a CH |
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 | ||
bc9fcbf9 | 324 | #endif /* BLK_INTERNAL_H */ |