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8324aa91 JA |
1 | #ifndef BLK_INTERNAL_H |
2 | #define BLK_INTERNAL_H | |
3 | ||
a73f730d | 4 | #include <linux/idr.h> |
f70ced09 ML |
5 | #include <linux/blk-mq.h> |
6 | #include "blk-mq.h" | |
a73f730d | 7 | |
86db1e29 JA |
8 | /* Amount of time in which a process may batch requests */ |
9 | #define BLK_BATCH_TIME (HZ/50UL) | |
10 | ||
11 | /* Number of requests a "batching" process may submit */ | |
12 | #define BLK_BATCH_REQ 32 | |
13 | ||
0d2602ca JA |
14 | /* Max future timer expiry for timeouts */ |
15 | #define BLK_MAX_TIMEOUT (5 * HZ) | |
16 | ||
7c94e1c1 ML |
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; | |
0048b483 ML |
25 | |
26 | /* | |
27 | * flush_rq shares tag with this rq, both can't be active | |
28 | * at the same time | |
29 | */ | |
30 | struct request *orig_rq; | |
7c94e1c1 ML |
31 | spinlock_t mq_flush_lock; |
32 | }; | |
33 | ||
8324aa91 | 34 | extern struct kmem_cache *blk_requestq_cachep; |
320ae51f | 35 | extern struct kmem_cache *request_cachep; |
8324aa91 | 36 | extern struct kobj_type blk_queue_ktype; |
a73f730d | 37 | extern struct ida blk_queue_ida; |
8324aa91 | 38 | |
7c94e1c1 | 39 | static inline struct blk_flush_queue *blk_get_flush_queue( |
e97c293c | 40 | struct request_queue *q, struct blk_mq_ctx *ctx) |
7c94e1c1 | 41 | { |
7d7e0f90 CH |
42 | if (q->mq_ops) |
43 | return blk_mq_map_queue(q, ctx->cpu)->fq; | |
44 | return q->fq; | |
7c94e1c1 ML |
45 | } |
46 | ||
09ac46c4 TH |
47 | static inline void __blk_get_queue(struct request_queue *q) |
48 | { | |
49 | kobject_get(&q->kobj); | |
50 | } | |
51 | ||
f70ced09 ML |
52 | struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, |
53 | int node, int cmd_size); | |
54 | void blk_free_flush_queue(struct blk_flush_queue *q); | |
f3552655 | 55 | |
5b788ce3 TH |
56 | int blk_init_rl(struct request_list *rl, struct request_queue *q, |
57 | gfp_t gfp_mask); | |
58 | void blk_exit_rl(struct request_list *rl); | |
86db1e29 JA |
59 | void init_request_from_bio(struct request *req, struct bio *bio); |
60 | void blk_rq_bio_prep(struct request_queue *q, struct request *rq, | |
61 | struct bio *bio); | |
d732580b TH |
62 | void blk_queue_bypass_start(struct request_queue *q); |
63 | void blk_queue_bypass_end(struct request_queue *q); | |
9934c8c0 | 64 | void blk_dequeue_request(struct request *rq); |
8324aa91 | 65 | void __blk_queue_free_tags(struct request_queue *q); |
4853abaa JM |
66 | bool __blk_end_bidi_request(struct request *rq, int error, |
67 | unsigned int nr_bytes, unsigned int bidi_bytes); | |
3ef28e83 DW |
68 | void blk_freeze_queue(struct request_queue *q); |
69 | ||
70 | static inline void blk_queue_enter_live(struct request_queue *q) | |
71 | { | |
72 | /* | |
73 | * Given that running in generic_make_request() context | |
74 | * guarantees that a live reference against q_usage_counter has | |
75 | * been established, further references under that same context | |
76 | * need not check that the queue has been frozen (marked dead). | |
77 | */ | |
78 | percpu_ref_get(&q->q_usage_counter); | |
79 | } | |
8324aa91 | 80 | |
5a48fc14 DW |
81 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
82 | void blk_flush_integrity(void); | |
83 | #else | |
84 | static inline void blk_flush_integrity(void) | |
85 | { | |
86 | } | |
87 | #endif | |
8324aa91 | 88 | |
287922eb | 89 | void blk_timeout_work(struct work_struct *work); |
0d2602ca | 90 | unsigned long blk_rq_timeout(unsigned long timeout); |
87ee7b11 | 91 | void blk_add_timer(struct request *req); |
242f9dcb | 92 | void blk_delete_timer(struct request *); |
242f9dcb | 93 | |
320ae51f JA |
94 | |
95 | bool bio_attempt_front_merge(struct request_queue *q, struct request *req, | |
96 | struct bio *bio); | |
97 | bool bio_attempt_back_merge(struct request_queue *q, struct request *req, | |
98 | struct bio *bio); | |
99 | bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, | |
5b3f341f SL |
100 | unsigned int *request_count, |
101 | struct request **same_queue_rq); | |
0809e3ac | 102 | unsigned int blk_plug_queued_count(struct request_queue *q); |
320ae51f JA |
103 | |
104 | void blk_account_io_start(struct request *req, bool new_io); | |
105 | void blk_account_io_completion(struct request *req, unsigned int bytes); | |
106 | void blk_account_io_done(struct request *req); | |
107 | ||
242f9dcb JA |
108 | /* |
109 | * Internal atomic flags for request handling | |
110 | */ | |
111 | enum rq_atomic_flags { | |
112 | REQ_ATOM_COMPLETE = 0, | |
320ae51f | 113 | REQ_ATOM_STARTED, |
06426adf | 114 | REQ_ATOM_POLL_SLEPT, |
242f9dcb JA |
115 | }; |
116 | ||
117 | /* | |
118 | * EH timer and IO completion will both attempt to 'grab' the request, make | |
25985edc | 119 | * sure that only one of them succeeds |
242f9dcb JA |
120 | */ |
121 | static inline int blk_mark_rq_complete(struct request *rq) | |
122 | { | |
123 | return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
124 | } | |
125 | ||
126 | static inline void blk_clear_rq_complete(struct request *rq) | |
127 | { | |
128 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
129 | } | |
86db1e29 | 130 | |
158dbda0 TH |
131 | /* |
132 | * Internal elevator interface | |
133 | */ | |
e8064021 | 134 | #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) |
158dbda0 | 135 | |
ae1b1539 | 136 | void blk_insert_flush(struct request *rq); |
dd831006 | 137 | |
158dbda0 TH |
138 | static inline struct request *__elv_next_request(struct request_queue *q) |
139 | { | |
140 | struct request *rq; | |
e97c293c | 141 | struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); |
158dbda0 TH |
142 | |
143 | while (1) { | |
ae1b1539 | 144 | if (!list_empty(&q->queue_head)) { |
158dbda0 | 145 | rq = list_entry_rq(q->queue_head.next); |
ae1b1539 | 146 | return rq; |
158dbda0 TH |
147 | } |
148 | ||
3ac0cc45 | 149 | /* |
150 | * Flush request is running and flush request isn't queueable | |
151 | * in the drive, we can hold the queue till flush request is | |
152 | * finished. Even we don't do this, driver can't dispatch next | |
153 | * requests and will requeue them. And this can improve | |
154 | * throughput too. For example, we have request flush1, write1, | |
155 | * flush 2. flush1 is dispatched, then queue is hold, write1 | |
156 | * isn't inserted to queue. After flush1 is finished, flush2 | |
157 | * will be dispatched. Since disk cache is already clean, | |
158 | * flush2 will be finished very soon, so looks like flush2 is | |
159 | * folded to flush1. | |
160 | * Since the queue is hold, a flag is set to indicate the queue | |
161 | * should be restarted later. Please see flush_end_io() for | |
162 | * details. | |
163 | */ | |
7c94e1c1 | 164 | if (fq->flush_pending_idx != fq->flush_running_idx && |
3ac0cc45 | 165 | !queue_flush_queueable(q)) { |
7c94e1c1 | 166 | fq->flush_queue_delayed = 1; |
3ac0cc45 | 167 | return NULL; |
168 | } | |
556ee818 | 169 | if (unlikely(blk_queue_bypass(q)) || |
22f746e2 | 170 | !q->elevator->type->ops.elevator_dispatch_fn(q, 0)) |
158dbda0 TH |
171 | return NULL; |
172 | } | |
173 | } | |
174 | ||
175 | static inline void elv_activate_rq(struct request_queue *q, struct request *rq) | |
176 | { | |
177 | struct elevator_queue *e = q->elevator; | |
178 | ||
22f746e2 TH |
179 | if (e->type->ops.elevator_activate_req_fn) |
180 | e->type->ops.elevator_activate_req_fn(q, rq); | |
158dbda0 TH |
181 | } |
182 | ||
183 | static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq) | |
184 | { | |
185 | struct elevator_queue *e = q->elevator; | |
186 | ||
22f746e2 TH |
187 | if (e->type->ops.elevator_deactivate_req_fn) |
188 | e->type->ops.elevator_deactivate_req_fn(q, rq); | |
158dbda0 TH |
189 | } |
190 | ||
581d4e28 JA |
191 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
192 | int blk_should_fake_timeout(struct request_queue *); | |
193 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
194 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
195 | const char *, size_t); | |
196 | #else | |
197 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
198 | { | |
199 | return 0; | |
200 | } | |
201 | #endif | |
202 | ||
d6d48196 JA |
203 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
204 | struct bio *bio); | |
205 | int ll_front_merge_fn(struct request_queue *q, struct request *req, | |
206 | struct bio *bio); | |
207 | int attempt_back_merge(struct request_queue *q, struct request *rq); | |
208 | int attempt_front_merge(struct request_queue *q, struct request *rq); | |
5e84ea3a JA |
209 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
210 | struct request *next); | |
d6d48196 | 211 | void blk_recalc_rq_segments(struct request *rq); |
80a761fd | 212 | void blk_rq_set_mixed_merge(struct request *rq); |
050c8ea8 TH |
213 | bool blk_rq_merge_ok(struct request *rq, struct bio *bio); |
214 | int blk_try_merge(struct request *rq, struct bio *bio); | |
d6d48196 | 215 | |
8324aa91 JA |
216 | void blk_queue_congestion_threshold(struct request_queue *q); |
217 | ||
ff88972c AB |
218 | int blk_dev_init(void); |
219 | ||
f253b86b | 220 | |
8324aa91 JA |
221 | /* |
222 | * Return the threshold (number of used requests) at which the queue is | |
223 | * considered to be congested. It include a little hysteresis to keep the | |
224 | * context switch rate down. | |
225 | */ | |
226 | static inline int queue_congestion_on_threshold(struct request_queue *q) | |
227 | { | |
228 | return q->nr_congestion_on; | |
229 | } | |
230 | ||
231 | /* | |
232 | * The threshold at which a queue is considered to be uncongested | |
233 | */ | |
234 | static inline int queue_congestion_off_threshold(struct request_queue *q) | |
235 | { | |
236 | return q->nr_congestion_off; | |
237 | } | |
238 | ||
e3a2b3f9 JA |
239 | extern int blk_update_nr_requests(struct request_queue *, unsigned int); |
240 | ||
c2553b58 JA |
241 | /* |
242 | * Contribute to IO statistics IFF: | |
243 | * | |
244 | * a) it's attached to a gendisk, and | |
245 | * b) the queue had IO stats enabled when this request was started, and | |
e2a60da7 | 246 | * c) it's a file system request |
c2553b58 | 247 | */ |
26308eab | 248 | static inline int blk_do_io_stat(struct request *rq) |
fb8ec18c | 249 | { |
33659ebb | 250 | return rq->rq_disk && |
e8064021 | 251 | (rq->rq_flags & RQF_IO_STAT) && |
e2a60da7 | 252 | (rq->cmd_type == REQ_TYPE_FS); |
fb8ec18c JA |
253 | } |
254 | ||
f2dbd76a TH |
255 | /* |
256 | * Internal io_context interface | |
257 | */ | |
258 | void get_io_context(struct io_context *ioc); | |
47fdd4ca | 259 | struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); |
24acfc34 TH |
260 | struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, |
261 | gfp_t gfp_mask); | |
7e5a8794 | 262 | void ioc_clear_queue(struct request_queue *q); |
f2dbd76a | 263 | |
24acfc34 | 264 | int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); |
f2dbd76a TH |
265 | |
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); | |
293 | #else /* CONFIG_BLK_DEV_THROTTLING */ | |
c9a929dd | 294 | static inline void blk_throtl_drain(struct request_queue *q) { } |
bc9fcbf9 TH |
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 | #endif /* CONFIG_BLK_DEV_THROTTLING */ | |
298 | ||
299 | #endif /* BLK_INTERNAL_H */ |