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31e4c28d VG |
1 | #ifndef _BLK_CGROUP_H |
2 | #define _BLK_CGROUP_H | |
3 | /* | |
4 | * Common Block IO controller cgroup interface | |
5 | * | |
6 | * Based on ideas and code from CFQ, CFS and BFQ: | |
7 | * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> | |
8 | * | |
9 | * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> | |
10 | * Paolo Valente <paolo.valente@unimore.it> | |
11 | * | |
12 | * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> | |
13 | * Nauman Rafique <nauman@google.com> | |
14 | */ | |
15 | ||
16 | #include <linux/cgroup.h> | |
575969a0 | 17 | #include <linux/u64_stats_sync.h> |
829fdb50 | 18 | #include <linux/seq_file.h> |
31e4c28d | 19 | |
062a644d VG |
20 | enum blkio_policy_id { |
21 | BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */ | |
4c9eefa1 | 22 | BLKIO_POLICY_THROTL, /* Throttling */ |
035d10b2 TH |
23 | |
24 | BLKIO_NR_POLICIES, | |
062a644d VG |
25 | }; |
26 | ||
9355aede VG |
27 | /* Max limits for throttle policy */ |
28 | #define THROTL_IOPS_MAX UINT_MAX | |
29 | ||
32e380ae | 30 | #ifdef CONFIG_BLK_CGROUP |
2f5ea477 | 31 | |
d3d32e69 TH |
32 | /* cft->private [un]packing for stat printing */ |
33 | #define BLKCG_STAT_PRIV(pol, off) (((unsigned)(pol) << 16) | (off)) | |
34 | #define BLKCG_STAT_POL(prv) ((unsigned)(prv) >> 16) | |
35 | #define BLKCG_STAT_OFF(prv) ((unsigned)(prv) & 0xffff) | |
2aa4a152 | 36 | |
edcb0722 TH |
37 | enum blkg_rwstat_type { |
38 | BLKG_RWSTAT_READ, | |
39 | BLKG_RWSTAT_WRITE, | |
40 | BLKG_RWSTAT_SYNC, | |
41 | BLKG_RWSTAT_ASYNC, | |
42 | ||
43 | BLKG_RWSTAT_NR, | |
44 | BLKG_RWSTAT_TOTAL = BLKG_RWSTAT_NR, | |
303a3acb DS |
45 | }; |
46 | ||
812df48d DS |
47 | /* blkg state flags */ |
48 | enum blkg_state_flags { | |
49 | BLKG_waiting = 0, | |
50 | BLKG_idling, | |
51 | BLKG_empty, | |
52 | }; | |
53 | ||
31e4c28d VG |
54 | struct blkio_cgroup { |
55 | struct cgroup_subsys_state css; | |
56 | unsigned int weight; | |
57 | spinlock_t lock; | |
58 | struct hlist_head blkg_list; | |
9a9e8a26 TH |
59 | |
60 | /* for policies to test whether associated blkcg has changed */ | |
61 | uint64_t id; | |
31e4c28d VG |
62 | }; |
63 | ||
edcb0722 TH |
64 | struct blkg_stat { |
65 | struct u64_stats_sync syncp; | |
66 | uint64_t cnt; | |
67 | }; | |
68 | ||
69 | struct blkg_rwstat { | |
70 | struct u64_stats_sync syncp; | |
71 | uint64_t cnt[BLKG_RWSTAT_NR]; | |
72 | }; | |
73 | ||
303a3acb | 74 | struct blkio_group_stats { |
edcb0722 TH |
75 | /* number of ios merged */ |
76 | struct blkg_rwstat merged; | |
77 | /* total time spent on device in ns, may not be accurate w/ queueing */ | |
78 | struct blkg_rwstat service_time; | |
79 | /* total time spent waiting in scheduler queue in ns */ | |
80 | struct blkg_rwstat wait_time; | |
81 | /* number of IOs queued up */ | |
82 | struct blkg_rwstat queued; | |
303a3acb | 83 | /* total disk time and nr sectors dispatched by this group */ |
edcb0722 | 84 | struct blkg_stat time; |
303a3acb | 85 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
edcb0722 TH |
86 | /* time not charged to this cgroup */ |
87 | struct blkg_stat unaccounted_time; | |
88 | /* sum of number of ios queued across all samples */ | |
89 | struct blkg_stat avg_queue_size_sum; | |
90 | /* count of samples taken for average */ | |
91 | struct blkg_stat avg_queue_size_samples; | |
92 | /* how many times this group has been removed from service tree */ | |
93 | struct blkg_stat dequeue; | |
94 | /* total time spent waiting for it to be assigned a timeslice. */ | |
95 | struct blkg_stat group_wait_time; | |
96 | /* time spent idling for this blkio_group */ | |
97 | struct blkg_stat idle_time; | |
98 | /* total time with empty current active q with other requests queued */ | |
99 | struct blkg_stat empty_time; | |
997a026c | 100 | /* fields after this shouldn't be cleared on stat reset */ |
edcb0722 TH |
101 | uint64_t start_group_wait_time; |
102 | uint64_t start_idle_time; | |
103 | uint64_t start_empty_time; | |
104 | uint16_t flags; | |
303a3acb DS |
105 | #endif |
106 | }; | |
107 | ||
5624a4e4 VG |
108 | /* Per cpu blkio group stats */ |
109 | struct blkio_group_stats_cpu { | |
edcb0722 TH |
110 | /* total bytes transferred */ |
111 | struct blkg_rwstat service_bytes; | |
112 | /* total IOs serviced, post merge */ | |
113 | struct blkg_rwstat serviced; | |
114 | /* total sectors transferred */ | |
115 | struct blkg_stat sectors; | |
5624a4e4 VG |
116 | }; |
117 | ||
e56da7e2 TH |
118 | struct blkio_group_conf { |
119 | unsigned int weight; | |
c4682aec | 120 | u64 iops[2]; |
e56da7e2 TH |
121 | u64 bps[2]; |
122 | }; | |
123 | ||
0381411e TH |
124 | /* per-blkg per-policy data */ |
125 | struct blkg_policy_data { | |
126 | /* the blkg this per-policy data belongs to */ | |
127 | struct blkio_group *blkg; | |
128 | ||
549d3aa8 TH |
129 | /* Configuration */ |
130 | struct blkio_group_conf conf; | |
131 | ||
132 | struct blkio_group_stats stats; | |
133 | /* Per cpu stats pointer */ | |
134 | struct blkio_group_stats_cpu __percpu *stats_cpu; | |
135 | ||
0381411e TH |
136 | /* pol->pdata_size bytes of private data used by policy impl */ |
137 | char pdata[] __aligned(__alignof__(unsigned long long)); | |
138 | }; | |
139 | ||
31e4c28d | 140 | struct blkio_group { |
c875f4d0 TH |
141 | /* Pointer to the associated request_queue */ |
142 | struct request_queue *q; | |
e8989fae | 143 | struct list_head q_node; |
31e4c28d | 144 | struct hlist_node blkcg_node; |
7ee9c562 | 145 | struct blkio_cgroup *blkcg; |
2868ef7b VG |
146 | /* Store cgroup path */ |
147 | char path[128]; | |
1adaf3dd TH |
148 | /* reference count */ |
149 | int refcnt; | |
22084190 | 150 | |
549d3aa8 | 151 | struct blkg_policy_data *pd[BLKIO_NR_POLICIES]; |
1adaf3dd | 152 | |
1cd9e039 VG |
153 | /* List of blkg waiting for per cpu stats memory to be allocated */ |
154 | struct list_head alloc_node; | |
1adaf3dd | 155 | struct rcu_head rcu_head; |
31e4c28d VG |
156 | }; |
157 | ||
0381411e | 158 | typedef void (blkio_init_group_fn)(struct blkio_group *blkg); |
ca32aefc | 159 | typedef void (blkio_update_group_weight_fn)(struct request_queue *q, |
fe071437 | 160 | struct blkio_group *blkg, unsigned int weight); |
ca32aefc | 161 | typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q, |
fe071437 | 162 | struct blkio_group *blkg, u64 read_bps); |
ca32aefc | 163 | typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q, |
fe071437 | 164 | struct blkio_group *blkg, u64 write_bps); |
ca32aefc | 165 | typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q, |
fe071437 | 166 | struct blkio_group *blkg, unsigned int read_iops); |
ca32aefc | 167 | typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q, |
fe071437 | 168 | struct blkio_group *blkg, unsigned int write_iops); |
3e252066 VG |
169 | |
170 | struct blkio_policy_ops { | |
0381411e | 171 | blkio_init_group_fn *blkio_init_group_fn; |
3e252066 | 172 | blkio_update_group_weight_fn *blkio_update_group_weight_fn; |
4c9eefa1 VG |
173 | blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn; |
174 | blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn; | |
7702e8f4 VG |
175 | blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn; |
176 | blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn; | |
3e252066 VG |
177 | }; |
178 | ||
179 | struct blkio_policy_type { | |
180 | struct list_head list; | |
181 | struct blkio_policy_ops ops; | |
062a644d | 182 | enum blkio_policy_id plid; |
0381411e | 183 | size_t pdata_size; /* policy specific private data size */ |
44ea53de | 184 | struct cftype *cftypes; /* cgroup files for the policy */ |
3e252066 VG |
185 | }; |
186 | ||
5efd6113 TH |
187 | extern int blkcg_init_queue(struct request_queue *q); |
188 | extern void blkcg_drain_queue(struct request_queue *q); | |
189 | extern void blkcg_exit_queue(struct request_queue *q); | |
190 | ||
3e252066 VG |
191 | /* Blkio controller policy registration */ |
192 | extern void blkio_policy_register(struct blkio_policy_type *); | |
193 | extern void blkio_policy_unregister(struct blkio_policy_type *); | |
e8989fae TH |
194 | extern void blkg_destroy_all(struct request_queue *q, bool destroy_root); |
195 | extern void update_root_blkg_pd(struct request_queue *q, | |
196 | enum blkio_policy_id plid); | |
3e252066 | 197 | |
829fdb50 TH |
198 | void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg, |
199 | u64 (*prfill)(struct seq_file *, struct blkg_policy_data *, int), | |
200 | int pol, int data, bool show_total); | |
201 | u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v); | |
202 | u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd, | |
203 | const struct blkg_rwstat *rwstat); | |
204 | int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft, | |
205 | struct seq_file *sf); | |
206 | int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft, | |
207 | struct seq_file *sf); | |
208 | int blkcg_print_cpu_stat(struct cgroup *cgrp, struct cftype *cft, | |
209 | struct seq_file *sf); | |
210 | int blkcg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft, | |
211 | struct seq_file *sf); | |
212 | ||
213 | struct blkg_conf_ctx { | |
214 | struct gendisk *disk; | |
215 | struct blkio_group *blkg; | |
216 | u64 v; | |
217 | }; | |
218 | ||
219 | int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input, | |
220 | struct blkg_conf_ctx *ctx); | |
221 | void blkg_conf_finish(struct blkg_conf_ctx *ctx); | |
222 | ||
223 | ||
0381411e TH |
224 | /** |
225 | * blkg_to_pdata - get policy private data | |
226 | * @blkg: blkg of interest | |
227 | * @pol: policy of interest | |
228 | * | |
229 | * Return pointer to private data associated with the @blkg-@pol pair. | |
230 | */ | |
231 | static inline void *blkg_to_pdata(struct blkio_group *blkg, | |
232 | struct blkio_policy_type *pol) | |
233 | { | |
549d3aa8 | 234 | return blkg ? blkg->pd[pol->plid]->pdata : NULL; |
0381411e TH |
235 | } |
236 | ||
237 | /** | |
238 | * pdata_to_blkg - get blkg associated with policy private data | |
239 | * @pdata: policy private data of interest | |
0381411e | 240 | * |
aaec55a0 | 241 | * @pdata is policy private data. Determine the blkg it's associated with. |
0381411e | 242 | */ |
aaec55a0 | 243 | static inline struct blkio_group *pdata_to_blkg(void *pdata) |
0381411e TH |
244 | { |
245 | if (pdata) { | |
246 | struct blkg_policy_data *pd = | |
247 | container_of(pdata, struct blkg_policy_data, pdata); | |
248 | return pd->blkg; | |
249 | } | |
250 | return NULL; | |
251 | } | |
252 | ||
afc24d49 VG |
253 | static inline char *blkg_path(struct blkio_group *blkg) |
254 | { | |
255 | return blkg->path; | |
256 | } | |
257 | ||
1adaf3dd TH |
258 | /** |
259 | * blkg_get - get a blkg reference | |
260 | * @blkg: blkg to get | |
261 | * | |
262 | * The caller should be holding queue_lock and an existing reference. | |
263 | */ | |
264 | static inline void blkg_get(struct blkio_group *blkg) | |
265 | { | |
266 | lockdep_assert_held(blkg->q->queue_lock); | |
267 | WARN_ON_ONCE(!blkg->refcnt); | |
268 | blkg->refcnt++; | |
269 | } | |
270 | ||
271 | void __blkg_release(struct blkio_group *blkg); | |
272 | ||
273 | /** | |
274 | * blkg_put - put a blkg reference | |
275 | * @blkg: blkg to put | |
276 | * | |
277 | * The caller should be holding queue_lock. | |
278 | */ | |
279 | static inline void blkg_put(struct blkio_group *blkg) | |
280 | { | |
281 | lockdep_assert_held(blkg->q->queue_lock); | |
282 | WARN_ON_ONCE(blkg->refcnt <= 0); | |
283 | if (!--blkg->refcnt) | |
284 | __blkg_release(blkg); | |
285 | } | |
286 | ||
edcb0722 TH |
287 | /** |
288 | * blkg_stat_add - add a value to a blkg_stat | |
289 | * @stat: target blkg_stat | |
290 | * @val: value to add | |
291 | * | |
292 | * Add @val to @stat. The caller is responsible for synchronizing calls to | |
293 | * this function. | |
294 | */ | |
295 | static inline void blkg_stat_add(struct blkg_stat *stat, uint64_t val) | |
296 | { | |
297 | u64_stats_update_begin(&stat->syncp); | |
298 | stat->cnt += val; | |
299 | u64_stats_update_end(&stat->syncp); | |
300 | } | |
301 | ||
302 | /** | |
303 | * blkg_stat_read - read the current value of a blkg_stat | |
304 | * @stat: blkg_stat to read | |
305 | * | |
306 | * Read the current value of @stat. This function can be called without | |
307 | * synchroniztion and takes care of u64 atomicity. | |
308 | */ | |
309 | static inline uint64_t blkg_stat_read(struct blkg_stat *stat) | |
310 | { | |
311 | unsigned int start; | |
312 | uint64_t v; | |
313 | ||
314 | do { | |
315 | start = u64_stats_fetch_begin(&stat->syncp); | |
316 | v = stat->cnt; | |
317 | } while (u64_stats_fetch_retry(&stat->syncp, start)); | |
318 | ||
319 | return v; | |
320 | } | |
321 | ||
322 | /** | |
323 | * blkg_stat_reset - reset a blkg_stat | |
324 | * @stat: blkg_stat to reset | |
325 | */ | |
326 | static inline void blkg_stat_reset(struct blkg_stat *stat) | |
327 | { | |
328 | stat->cnt = 0; | |
329 | } | |
330 | ||
331 | /** | |
332 | * blkg_rwstat_add - add a value to a blkg_rwstat | |
333 | * @rwstat: target blkg_rwstat | |
334 | * @rw: mask of REQ_{WRITE|SYNC} | |
335 | * @val: value to add | |
336 | * | |
337 | * Add @val to @rwstat. The counters are chosen according to @rw. The | |
338 | * caller is responsible for synchronizing calls to this function. | |
339 | */ | |
340 | static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat, | |
341 | int rw, uint64_t val) | |
342 | { | |
343 | u64_stats_update_begin(&rwstat->syncp); | |
344 | ||
345 | if (rw & REQ_WRITE) | |
346 | rwstat->cnt[BLKG_RWSTAT_WRITE] += val; | |
347 | else | |
348 | rwstat->cnt[BLKG_RWSTAT_READ] += val; | |
349 | if (rw & REQ_SYNC) | |
350 | rwstat->cnt[BLKG_RWSTAT_SYNC] += val; | |
351 | else | |
352 | rwstat->cnt[BLKG_RWSTAT_ASYNC] += val; | |
353 | ||
354 | u64_stats_update_end(&rwstat->syncp); | |
355 | } | |
356 | ||
357 | /** | |
358 | * blkg_rwstat_read - read the current values of a blkg_rwstat | |
359 | * @rwstat: blkg_rwstat to read | |
360 | * | |
361 | * Read the current snapshot of @rwstat and return it as the return value. | |
362 | * This function can be called without synchronization and takes care of | |
363 | * u64 atomicity. | |
364 | */ | |
365 | static struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat) | |
366 | { | |
367 | unsigned int start; | |
368 | struct blkg_rwstat tmp; | |
369 | ||
370 | do { | |
371 | start = u64_stats_fetch_begin(&rwstat->syncp); | |
372 | tmp = *rwstat; | |
373 | } while (u64_stats_fetch_retry(&rwstat->syncp, start)); | |
374 | ||
375 | return tmp; | |
376 | } | |
377 | ||
378 | /** | |
379 | * blkg_rwstat_sum - read the total count of a blkg_rwstat | |
380 | * @rwstat: blkg_rwstat to read | |
381 | * | |
382 | * Return the total count of @rwstat regardless of the IO direction. This | |
383 | * function can be called without synchronization and takes care of u64 | |
384 | * atomicity. | |
385 | */ | |
386 | static inline uint64_t blkg_rwstat_sum(struct blkg_rwstat *rwstat) | |
387 | { | |
388 | struct blkg_rwstat tmp = blkg_rwstat_read(rwstat); | |
389 | ||
390 | return tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE]; | |
391 | } | |
392 | ||
393 | /** | |
394 | * blkg_rwstat_reset - reset a blkg_rwstat | |
395 | * @rwstat: blkg_rwstat to reset | |
396 | */ | |
397 | static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat) | |
398 | { | |
399 | memset(rwstat->cnt, 0, sizeof(rwstat->cnt)); | |
400 | } | |
401 | ||
2f5ea477 JA |
402 | #else |
403 | ||
404 | struct blkio_group { | |
405 | }; | |
406 | ||
3e252066 VG |
407 | struct blkio_policy_type { |
408 | }; | |
409 | ||
5efd6113 TH |
410 | static inline int blkcg_init_queue(struct request_queue *q) { return 0; } |
411 | static inline void blkcg_drain_queue(struct request_queue *q) { } | |
412 | static inline void blkcg_exit_queue(struct request_queue *q) { } | |
3e252066 VG |
413 | static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } |
414 | static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } | |
03aa264a | 415 | static inline void blkg_destroy_all(struct request_queue *q, |
03aa264a | 416 | bool destory_root) { } |
e8989fae TH |
417 | static inline void update_root_blkg_pd(struct request_queue *q, |
418 | enum blkio_policy_id plid) { } | |
3e252066 | 419 | |
0381411e TH |
420 | static inline void *blkg_to_pdata(struct blkio_group *blkg, |
421 | struct blkio_policy_type *pol) { return NULL; } | |
422 | static inline struct blkio_group *pdata_to_blkg(void *pdata, | |
423 | struct blkio_policy_type *pol) { return NULL; } | |
afc24d49 | 424 | static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } |
1adaf3dd TH |
425 | static inline void blkg_get(struct blkio_group *blkg) { } |
426 | static inline void blkg_put(struct blkio_group *blkg) { } | |
afc24d49 | 427 | |
2f5ea477 JA |
428 | #endif |
429 | ||
df457f84 | 430 | #define BLKIO_WEIGHT_MIN 10 |
31e4c28d VG |
431 | #define BLKIO_WEIGHT_MAX 1000 |
432 | #define BLKIO_WEIGHT_DEFAULT 500 | |
433 | ||
2868ef7b | 434 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
c1768268 TH |
435 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg, |
436 | struct blkio_policy_type *pol); | |
9195291e | 437 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
c1768268 TH |
438 | struct blkio_policy_type *pol, |
439 | unsigned long dequeue); | |
440 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg, | |
441 | struct blkio_policy_type *pol); | |
442 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg, | |
443 | struct blkio_policy_type *pol); | |
444 | void blkiocg_set_start_empty_time(struct blkio_group *blkg, | |
445 | struct blkio_policy_type *pol); | |
812df48d DS |
446 | |
447 | #define BLKG_FLAG_FNS(name) \ | |
448 | static inline void blkio_mark_blkg_##name( \ | |
449 | struct blkio_group_stats *stats) \ | |
450 | { \ | |
451 | stats->flags |= (1 << BLKG_##name); \ | |
452 | } \ | |
453 | static inline void blkio_clear_blkg_##name( \ | |
454 | struct blkio_group_stats *stats) \ | |
455 | { \ | |
456 | stats->flags &= ~(1 << BLKG_##name); \ | |
457 | } \ | |
458 | static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \ | |
459 | { \ | |
460 | return (stats->flags & (1 << BLKG_##name)) != 0; \ | |
461 | } \ | |
462 | ||
463 | BLKG_FLAG_FNS(waiting) | |
464 | BLKG_FLAG_FNS(idling) | |
465 | BLKG_FLAG_FNS(empty) | |
466 | #undef BLKG_FLAG_FNS | |
2868ef7b | 467 | #else |
c1768268 TH |
468 | static inline void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg, |
469 | struct blkio_policy_type *pol) { } | |
9195291e | 470 | static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
c1768268 TH |
471 | struct blkio_policy_type *pol, unsigned long dequeue) { } |
472 | static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg, | |
473 | struct blkio_policy_type *pol) { } | |
474 | static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg, | |
475 | struct blkio_policy_type *pol) { } | |
476 | static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg, | |
477 | struct blkio_policy_type *pol) { } | |
2868ef7b VG |
478 | #endif |
479 | ||
32e380ae | 480 | #ifdef CONFIG_BLK_CGROUP |
31e4c28d VG |
481 | extern struct blkio_cgroup blkio_root_cgroup; |
482 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); | |
4f85cb96 | 483 | extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio); |
cd1604fa | 484 | extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, |
e8989fae | 485 | struct request_queue *q); |
cd1604fa TH |
486 | struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg, |
487 | struct request_queue *q, | |
cd1604fa | 488 | bool for_root); |
303a3acb | 489 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
c1768268 TH |
490 | struct blkio_policy_type *pol, |
491 | unsigned long time, | |
492 | unsigned long unaccounted_time); | |
493 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, | |
494 | struct blkio_policy_type *pol, | |
495 | uint64_t bytes, bool direction, bool sync); | |
84c124da | 496 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
c1768268 TH |
497 | struct blkio_policy_type *pol, |
498 | uint64_t start_time, | |
499 | uint64_t io_start_time, bool direction, | |
500 | bool sync); | |
501 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, | |
502 | struct blkio_policy_type *pol, | |
503 | bool direction, bool sync); | |
a11cdaa7 | 504 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
c1768268 TH |
505 | struct blkio_policy_type *pol, |
506 | struct blkio_group *curr_blkg, bool direction, | |
507 | bool sync); | |
a11cdaa7 | 508 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
c1768268 TH |
509 | struct blkio_policy_type *pol, |
510 | bool direction, bool sync); | |
31e4c28d | 511 | #else |
2f5ea477 | 512 | struct cgroup; |
31e4c28d VG |
513 | static inline struct blkio_cgroup * |
514 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } | |
70087dc3 | 515 | static inline struct blkio_cgroup * |
4f85cb96 | 516 | bio_blkio_cgroup(struct bio *bio) { return NULL; } |
31e4c28d | 517 | |
cd1604fa TH |
518 | static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, |
519 | void *key) { return NULL; } | |
303a3acb | 520 | static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
c1768268 TH |
521 | struct blkio_policy_type *pol, unsigned long time, |
522 | unsigned long unaccounted_time) { } | |
84c124da | 523 | static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
c1768268 TH |
524 | struct blkio_policy_type *pol, uint64_t bytes, |
525 | bool direction, bool sync) { } | |
84c124da | 526 | static inline void blkiocg_update_completion_stats(struct blkio_group *blkg, |
c1768268 TH |
527 | struct blkio_policy_type *pol, uint64_t start_time, |
528 | uint64_t io_start_time, bool direction, bool sync) { } | |
812d4026 | 529 | static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg, |
c1768268 TH |
530 | struct blkio_policy_type *pol, bool direction, |
531 | bool sync) { } | |
a11cdaa7 | 532 | static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
c1768268 TH |
533 | struct blkio_policy_type *pol, |
534 | struct blkio_group *curr_blkg, bool direction, | |
535 | bool sync) { } | |
a11cdaa7 | 536 | static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
c1768268 TH |
537 | struct blkio_policy_type *pol, bool direction, |
538 | bool sync) { } | |
31e4c28d VG |
539 | #endif |
540 | #endif /* _BLK_CGROUP_H */ |