This source file includes following definitions.
- blk_get_flush_queue
- __blk_get_queue
- is_flush_rq
- blk_queue_enter_live
- biovec_phys_mergeable
- __bvec_gap_to_prev
- bvec_gap_to_prev
- blk_rq_bio_prep
- bio_integrity_endio
- integrity_req_gap_back_merge
- integrity_req_gap_front_merge
- integrity_req_gap_back_merge
- integrity_req_gap_front_merge
- blk_flush_integrity
- bio_integrity_endio
- bio_integrity_free
- elevator_exit
- blk_should_fake_timeout
- blk_do_io_stat
- req_set_nomerge
- bio_allowed_max_sectors
- create_io_context
- blk_throtl_drain
- blk_throtl_init
- blk_throtl_exit
- blk_throtl_register_queue
- blk_throtl_bio_endio
- blk_throtl_stat_add
- init_emergency_isa_pool
- blk_queue_bounce
- blk_iolatency_init
- blk_queue_free_zone_bitmaps
1
2 #ifndef BLK_INTERNAL_H
3 #define BLK_INTERNAL_H
4
5 #include <linux/idr.h>
6 #include <linux/blk-mq.h>
7 #include <xen/xen.h>
8 #include "blk-mq.h"
9 #include "blk-mq-sched.h"
10
11
12 #define BLK_MAX_TIMEOUT (5 * HZ)
13
14 #ifdef CONFIG_DEBUG_FS
15 extern struct dentry *blk_debugfs_root;
16 #endif
17
18 struct blk_flush_queue {
19 unsigned int flush_queue_delayed:1;
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;
27
28
29
30
31
32 struct request *orig_rq;
33 struct lock_class_key key;
34 spinlock_t mq_flush_lock;
35 };
36
37 extern struct kmem_cache *blk_requestq_cachep;
38 extern struct kobj_type blk_queue_ktype;
39 extern struct ida blk_queue_ida;
40
41 static inline struct blk_flush_queue *
42 blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
43 {
44 return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
45 }
46
47 static inline void __blk_get_queue(struct request_queue *q)
48 {
49 kobject_get(&q->kobj);
50 }
51
52 static inline bool
53 is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
54 {
55 return hctx->fq->flush_rq == req;
56 }
57
58 struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
59 int node, int cmd_size, gfp_t flags);
60 void blk_free_flush_queue(struct blk_flush_queue *q);
61
62 void blk_freeze_queue(struct request_queue *q);
63
64 static inline void blk_queue_enter_live(struct request_queue *q)
65 {
66
67
68
69
70
71
72 percpu_ref_get(&q->q_usage_counter);
73 }
74
75 static inline bool biovec_phys_mergeable(struct request_queue *q,
76 struct bio_vec *vec1, struct bio_vec *vec2)
77 {
78 unsigned long mask = queue_segment_boundary(q);
79 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
80 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
81
82 if (addr1 + vec1->bv_len != addr2)
83 return false;
84 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
85 return false;
86 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
87 return false;
88 return true;
89 }
90
91 static inline bool __bvec_gap_to_prev(struct request_queue *q,
92 struct bio_vec *bprv, unsigned int offset)
93 {
94 return (offset & queue_virt_boundary(q)) ||
95 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
96 }
97
98
99
100
101
102 static inline bool bvec_gap_to_prev(struct request_queue *q,
103 struct bio_vec *bprv, unsigned int offset)
104 {
105 if (!queue_virt_boundary(q))
106 return false;
107 return __bvec_gap_to_prev(q, bprv, offset);
108 }
109
110 static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
111 unsigned int nr_segs)
112 {
113 rq->nr_phys_segments = nr_segs;
114 rq->__data_len = bio->bi_iter.bi_size;
115 rq->bio = rq->biotail = bio;
116 rq->ioprio = bio_prio(bio);
117
118 if (bio->bi_disk)
119 rq->rq_disk = bio->bi_disk;
120 }
121
122 #ifdef CONFIG_BLK_DEV_INTEGRITY
123 void blk_flush_integrity(void);
124 bool __bio_integrity_endio(struct bio *);
125 void bio_integrity_free(struct bio *bio);
126 static inline bool bio_integrity_endio(struct bio *bio)
127 {
128 if (bio_integrity(bio))
129 return __bio_integrity_endio(bio);
130 return true;
131 }
132
133 static inline bool integrity_req_gap_back_merge(struct request *req,
134 struct bio *next)
135 {
136 struct bio_integrity_payload *bip = bio_integrity(req->bio);
137 struct bio_integrity_payload *bip_next = bio_integrity(next);
138
139 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
140 bip_next->bip_vec[0].bv_offset);
141 }
142
143 static inline bool integrity_req_gap_front_merge(struct request *req,
144 struct bio *bio)
145 {
146 struct bio_integrity_payload *bip = bio_integrity(bio);
147 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
148
149 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
150 bip_next->bip_vec[0].bv_offset);
151 }
152 #else
153 static inline bool integrity_req_gap_back_merge(struct request *req,
154 struct bio *next)
155 {
156 return false;
157 }
158 static inline bool integrity_req_gap_front_merge(struct request *req,
159 struct bio *bio)
160 {
161 return false;
162 }
163
164 static inline void blk_flush_integrity(void)
165 {
166 }
167 static inline bool bio_integrity_endio(struct bio *bio)
168 {
169 return true;
170 }
171 static inline void bio_integrity_free(struct bio *bio)
172 {
173 }
174 #endif
175
176 unsigned long blk_rq_timeout(unsigned long timeout);
177 void blk_add_timer(struct request *req);
178
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,
184 struct bio *bio);
185 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
186 unsigned int nr_segs, struct request **same_queue_rq);
187
188 void blk_account_io_start(struct request *req, bool new_io);
189 void blk_account_io_completion(struct request *req, unsigned int bytes);
190 void blk_account_io_done(struct request *req, u64 now);
191
192
193
194
195 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
196
197 void blk_insert_flush(struct request *rq);
198
199 void elevator_init_mq(struct request_queue *q);
200 int elevator_switch_mq(struct request_queue *q,
201 struct elevator_type *new_e);
202 void __elevator_exit(struct request_queue *, struct elevator_queue *);
203 int elv_register_queue(struct request_queue *q, bool uevent);
204 void elv_unregister_queue(struct request_queue *q);
205
206 static inline void elevator_exit(struct request_queue *q,
207 struct elevator_queue *e)
208 {
209 lockdep_assert_held(&q->sysfs_lock);
210
211 blk_mq_sched_free_requests(q);
212 __elevator_exit(q, e);
213 }
214
215 struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
216
217 #ifdef CONFIG_FAIL_IO_TIMEOUT
218 int blk_should_fake_timeout(struct request_queue *);
219 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
220 ssize_t part_timeout_store(struct device *, struct device_attribute *,
221 const char *, size_t);
222 #else
223 static inline int blk_should_fake_timeout(struct request_queue *q)
224 {
225 return 0;
226 }
227 #endif
228
229 void __blk_queue_split(struct request_queue *q, struct bio **bio,
230 unsigned int *nr_segs);
231 int ll_back_merge_fn(struct request *req, struct bio *bio,
232 unsigned int nr_segs);
233 int ll_front_merge_fn(struct request *req, struct bio *bio,
234 unsigned int nr_segs);
235 struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
236 struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
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);
243
244 int blk_dev_init(void);
245
246
247
248
249
250
251
252
253 static inline bool blk_do_io_stat(struct request *rq)
254 {
255 return rq->rq_disk &&
256 (rq->rq_flags & RQF_IO_STAT) &&
257 !blk_rq_is_passthrough(rq);
258 }
259
260 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
261 {
262 req->cmd_flags |= REQ_NOMERGE;
263 if (req == q->last_merge)
264 q->last_merge = NULL;
265 }
266
267
268
269
270
271
272 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
273 {
274 return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
275 }
276
277
278
279
280 void get_io_context(struct io_context *ioc);
281 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
282 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
283 gfp_t gfp_mask);
284 void ioc_clear_queue(struct request_queue *q);
285
286 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
287
288
289
290
291
292
293
294
295
296
297
298
299
300 static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
301 {
302 WARN_ON_ONCE(irqs_disabled());
303 if (unlikely(!current->io_context))
304 create_task_io_context(current, gfp_mask, node);
305 return current->io_context;
306 }
307
308
309
310
311 #ifdef CONFIG_BLK_DEV_THROTTLING
312 extern void blk_throtl_drain(struct request_queue *q);
313 extern int blk_throtl_init(struct request_queue *q);
314 extern void blk_throtl_exit(struct request_queue *q);
315 extern void blk_throtl_register_queue(struct request_queue *q);
316 #else
317 static inline void blk_throtl_drain(struct request_queue *q) { }
318 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
319 static inline void blk_throtl_exit(struct request_queue *q) { }
320 static inline void blk_throtl_register_queue(struct request_queue *q) { }
321 #endif
322 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
323 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
324 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
325 const char *page, size_t count);
326 extern void blk_throtl_bio_endio(struct bio *bio);
327 extern void blk_throtl_stat_add(struct request *rq, u64 time);
328 #else
329 static inline void blk_throtl_bio_endio(struct bio *bio) { }
330 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
331 #endif
332
333 #ifdef CONFIG_BOUNCE
334 extern int init_emergency_isa_pool(void);
335 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
336 #else
337 static inline int init_emergency_isa_pool(void)
338 {
339 return 0;
340 }
341 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
342 {
343 }
344 #endif
345
346 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
347 extern int blk_iolatency_init(struct request_queue *q);
348 #else
349 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
350 #endif
351
352 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
353
354 #ifdef CONFIG_BLK_DEV_ZONED
355 void blk_queue_free_zone_bitmaps(struct request_queue *q);
356 #else
357 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
358 #endif
359
360 #endif