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1 | /* |
2 | * Common Block IO controller cgroup interface |
3 | * |
4 | * Based on ideas and code from CFQ, CFS and BFQ: |
5 | * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
6 | * |
7 | * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> |
8 | * Paolo Valente <paolo.valente@unimore.it> |
9 | * |
10 | * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> |
11 | * Nauman Rafique <nauman@google.com> |
12 | */ |
13 | #include <linux/ioprio.h> |
14 | #include <linux/seq_file.h> |
15 | #include <linux/kdev_t.h> |
16 | #include <linux/module.h> |
17 | #include <linux/err.h> |
18 | #include <linux/blkdev.h> |
19 | #include <linux/slab.h> |
20 | #include "blk-cgroup.h" |
21 | #include <linux/genhd.h> |
22 | |
23 | #define MAX_KEY_LEN 100 |
24 | |
25 | static DEFINE_SPINLOCK(blkio_list_lock); |
26 | static LIST_HEAD(blkio_list); |
27 | |
28 | struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; |
29 | EXPORT_SYMBOL_GPL(blkio_root_cgroup); |
30 | |
31 | static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *, |
32 | struct cgroup *); |
33 | static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *, |
34 | struct task_struct *, bool); |
35 | static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *, |
36 | struct cgroup *, struct task_struct *, bool); |
37 | static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *); |
38 | static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *); |
39 | |
40 | /* for encoding cft->private value on file */ |
41 | #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
42 | /* What policy owns the file, proportional or throttle */ |
43 | #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) |
44 | #define BLKIOFILE_ATTR(val) ((val) & 0xffff) |
45 | |
46 | struct cgroup_subsys blkio_subsys = { |
47 | .name = "blkio", |
48 | .create = blkiocg_create, |
49 | .can_attach = blkiocg_can_attach, |
50 | .attach = blkiocg_attach, |
51 | .destroy = blkiocg_destroy, |
52 | .populate = blkiocg_populate, |
53 | #ifdef CONFIG_BLK_CGROUP |
54 | /* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */ |
55 | .subsys_id = blkio_subsys_id, |
56 | #endif |
57 | .use_id = 1, |
58 | .module = THIS_MODULE, |
59 | }; |
60 | EXPORT_SYMBOL_GPL(blkio_subsys); |
61 | |
62 | static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg, |
63 | struct blkio_policy_node *pn) |
64 | { |
65 | list_add(&pn->node, &blkcg->policy_list); |
66 | } |
67 | |
68 | static inline bool cftype_blkg_same_policy(struct cftype *cft, |
69 | struct blkio_group *blkg) |
70 | { |
71 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
72 | |
73 | if (blkg->plid == plid) |
74 | return 1; |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | /* Determines if policy node matches cgroup file being accessed */ |
80 | static inline bool pn_matches_cftype(struct cftype *cft, |
81 | struct blkio_policy_node *pn) |
82 | { |
83 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
84 | int fileid = BLKIOFILE_ATTR(cft->private); |
85 | |
86 | return (plid == pn->plid && fileid == pn->fileid); |
87 | } |
88 | |
89 | /* Must be called with blkcg->lock held */ |
90 | static inline void blkio_policy_delete_node(struct blkio_policy_node *pn) |
91 | { |
92 | list_del(&pn->node); |
93 | } |
94 | |
95 | /* Must be called with blkcg->lock held */ |
96 | static struct blkio_policy_node * |
97 | blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev, |
98 | enum blkio_policy_id plid, int fileid) |
99 | { |
100 | struct blkio_policy_node *pn; |
101 | |
102 | list_for_each_entry(pn, &blkcg->policy_list, node) { |
103 | if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid) |
104 | return pn; |
105 | } |
106 | |
107 | return NULL; |
108 | } |
109 | |
110 | struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) |
111 | { |
112 | return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), |
113 | struct blkio_cgroup, css); |
114 | } |
115 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
116 | |
117 | struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) |
118 | { |
119 | return container_of(task_subsys_state(tsk, blkio_subsys_id), |
120 | struct blkio_cgroup, css); |
121 | } |
122 | EXPORT_SYMBOL_GPL(task_blkio_cgroup); |
123 | |
124 | static inline void |
125 | blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) |
126 | { |
127 | struct blkio_policy_type *blkiop; |
128 | |
129 | list_for_each_entry(blkiop, &blkio_list, list) { |
130 | /* If this policy does not own the blkg, do not send updates */ |
131 | if (blkiop->plid != blkg->plid) |
132 | continue; |
133 | if (blkiop->ops.blkio_update_group_weight_fn) |
134 | blkiop->ops.blkio_update_group_weight_fn(blkg->key, |
135 | blkg, weight); |
136 | } |
137 | } |
138 | |
139 | static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, |
140 | int fileid) |
141 | { |
142 | struct blkio_policy_type *blkiop; |
143 | |
144 | list_for_each_entry(blkiop, &blkio_list, list) { |
145 | |
146 | /* If this policy does not own the blkg, do not send updates */ |
147 | if (blkiop->plid != blkg->plid) |
148 | continue; |
149 | |
150 | if (fileid == BLKIO_THROTL_read_bps_device |
151 | && blkiop->ops.blkio_update_group_read_bps_fn) |
152 | blkiop->ops.blkio_update_group_read_bps_fn(blkg->key, |
153 | blkg, bps); |
154 | |
155 | if (fileid == BLKIO_THROTL_write_bps_device |
156 | && blkiop->ops.blkio_update_group_write_bps_fn) |
157 | blkiop->ops.blkio_update_group_write_bps_fn(blkg->key, |
158 | blkg, bps); |
159 | } |
160 | } |
161 | |
162 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
163 | unsigned int iops, int fileid) |
164 | { |
165 | struct blkio_policy_type *blkiop; |
166 | |
167 | list_for_each_entry(blkiop, &blkio_list, list) { |
168 | |
169 | /* If this policy does not own the blkg, do not send updates */ |
170 | if (blkiop->plid != blkg->plid) |
171 | continue; |
172 | |
173 | if (fileid == BLKIO_THROTL_read_iops_device |
174 | && blkiop->ops.blkio_update_group_read_iops_fn) |
175 | blkiop->ops.blkio_update_group_read_iops_fn(blkg->key, |
176 | blkg, iops); |
177 | |
178 | if (fileid == BLKIO_THROTL_write_iops_device |
179 | && blkiop->ops.blkio_update_group_write_iops_fn) |
180 | blkiop->ops.blkio_update_group_write_iops_fn(blkg->key, |
181 | blkg,iops); |
182 | } |
183 | } |
184 | |
185 | /* |
186 | * Add to the appropriate stat variable depending on the request type. |
187 | * This should be called with the blkg->stats_lock held. |
188 | */ |
189 | static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, |
190 | bool sync) |
191 | { |
192 | if (direction) |
193 | stat[BLKIO_STAT_WRITE] += add; |
194 | else |
195 | stat[BLKIO_STAT_READ] += add; |
196 | if (sync) |
197 | stat[BLKIO_STAT_SYNC] += add; |
198 | else |
199 | stat[BLKIO_STAT_ASYNC] += add; |
200 | } |
201 | |
202 | /* |
203 | * Decrements the appropriate stat variable if non-zero depending on the |
204 | * request type. Panics on value being zero. |
205 | * This should be called with the blkg->stats_lock held. |
206 | */ |
207 | static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) |
208 | { |
209 | if (direction) { |
210 | BUG_ON(stat[BLKIO_STAT_WRITE] == 0); |
211 | stat[BLKIO_STAT_WRITE]--; |
212 | } else { |
213 | BUG_ON(stat[BLKIO_STAT_READ] == 0); |
214 | stat[BLKIO_STAT_READ]--; |
215 | } |
216 | if (sync) { |
217 | BUG_ON(stat[BLKIO_STAT_SYNC] == 0); |
218 | stat[BLKIO_STAT_SYNC]--; |
219 | } else { |
220 | BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); |
221 | stat[BLKIO_STAT_ASYNC]--; |
222 | } |
223 | } |
224 | |
225 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
226 | /* This should be called with the blkg->stats_lock held. */ |
227 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
228 | struct blkio_group *curr_blkg) |
229 | { |
230 | if (blkio_blkg_waiting(&blkg->stats)) |
231 | return; |
232 | if (blkg == curr_blkg) |
233 | return; |
234 | blkg->stats.start_group_wait_time = sched_clock(); |
235 | blkio_mark_blkg_waiting(&blkg->stats); |
236 | } |
237 | |
238 | /* This should be called with the blkg->stats_lock held. */ |
239 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) |
240 | { |
241 | unsigned long long now; |
242 | |
243 | if (!blkio_blkg_waiting(stats)) |
244 | return; |
245 | |
246 | now = sched_clock(); |
247 | if (time_after64(now, stats->start_group_wait_time)) |
248 | stats->group_wait_time += now - stats->start_group_wait_time; |
249 | blkio_clear_blkg_waiting(stats); |
250 | } |
251 | |
252 | /* This should be called with the blkg->stats_lock held. */ |
253 | static void blkio_end_empty_time(struct blkio_group_stats *stats) |
254 | { |
255 | unsigned long long now; |
256 | |
257 | if (!blkio_blkg_empty(stats)) |
258 | return; |
259 | |
260 | now = sched_clock(); |
261 | if (time_after64(now, stats->start_empty_time)) |
262 | stats->empty_time += now - stats->start_empty_time; |
263 | blkio_clear_blkg_empty(stats); |
264 | } |
265 | |
266 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) |
267 | { |
268 | unsigned long flags; |
269 | |
270 | spin_lock_irqsave(&blkg->stats_lock, flags); |
271 | BUG_ON(blkio_blkg_idling(&blkg->stats)); |
272 | blkg->stats.start_idle_time = sched_clock(); |
273 | blkio_mark_blkg_idling(&blkg->stats); |
274 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
275 | } |
276 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); |
277 | |
278 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg) |
279 | { |
280 | unsigned long flags; |
281 | unsigned long long now; |
282 | struct blkio_group_stats *stats; |
283 | |
284 | spin_lock_irqsave(&blkg->stats_lock, flags); |
285 | stats = &blkg->stats; |
286 | if (blkio_blkg_idling(stats)) { |
287 | now = sched_clock(); |
288 | if (time_after64(now, stats->start_idle_time)) |
289 | stats->idle_time += now - stats->start_idle_time; |
290 | blkio_clear_blkg_idling(stats); |
291 | } |
292 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
293 | } |
294 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); |
295 | |
296 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
297 | { |
298 | unsigned long flags; |
299 | struct blkio_group_stats *stats; |
300 | |
301 | spin_lock_irqsave(&blkg->stats_lock, flags); |
302 | stats = &blkg->stats; |
303 | stats->avg_queue_size_sum += |
304 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + |
305 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; |
306 | stats->avg_queue_size_samples++; |
307 | blkio_update_group_wait_time(stats); |
308 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
309 | } |
310 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
311 | |
312 | void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
313 | { |
314 | unsigned long flags; |
315 | struct blkio_group_stats *stats; |
316 | |
317 | spin_lock_irqsave(&blkg->stats_lock, flags); |
318 | stats = &blkg->stats; |
319 | |
320 | if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || |
321 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { |
322 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
323 | return; |
324 | } |
325 | |
326 | /* |
327 | * group is already marked empty. This can happen if cfqq got new |
328 | * request in parent group and moved to this group while being added |
329 | * to service tree. Just ignore the event and move on. |
330 | */ |
331 | if(blkio_blkg_empty(stats)) { |
332 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
333 | return; |
334 | } |
335 | |
336 | stats->start_empty_time = sched_clock(); |
337 | blkio_mark_blkg_empty(stats); |
338 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
339 | } |
340 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); |
341 | |
342 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
343 | unsigned long dequeue) |
344 | { |
345 | blkg->stats.dequeue += dequeue; |
346 | } |
347 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); |
348 | #else |
349 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
350 | struct blkio_group *curr_blkg) {} |
351 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} |
352 | #endif |
353 | |
354 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
355 | struct blkio_group *curr_blkg, bool direction, |
356 | bool sync) |
357 | { |
358 | unsigned long flags; |
359 | |
360 | spin_lock_irqsave(&blkg->stats_lock, flags); |
361 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, |
362 | sync); |
363 | blkio_end_empty_time(&blkg->stats); |
364 | blkio_set_start_group_wait_time(blkg, curr_blkg); |
365 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
366 | } |
367 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
368 | |
369 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
370 | bool direction, bool sync) |
371 | { |
372 | unsigned long flags; |
373 | |
374 | spin_lock_irqsave(&blkg->stats_lock, flags); |
375 | blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], |
376 | direction, sync); |
377 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
378 | } |
379 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
380 | |
381 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time, |
382 | unsigned long unaccounted_time) |
383 | { |
384 | unsigned long flags; |
385 | |
386 | spin_lock_irqsave(&blkg->stats_lock, flags); |
387 | blkg->stats.time += time; |
388 | blkg->stats.unaccounted_time += unaccounted_time; |
389 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
390 | } |
391 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
392 | |
393 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
394 | uint64_t bytes, bool direction, bool sync) |
395 | { |
396 | struct blkio_group_stats *stats; |
397 | unsigned long flags; |
398 | |
399 | spin_lock_irqsave(&blkg->stats_lock, flags); |
400 | stats = &blkg->stats; |
401 | stats->sectors += bytes >> 9; |
402 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICED], 1, direction, |
403 | sync); |
404 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_BYTES], bytes, |
405 | direction, sync); |
406 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
407 | } |
408 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
409 | |
410 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
411 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) |
412 | { |
413 | struct blkio_group_stats *stats; |
414 | unsigned long flags; |
415 | unsigned long long now = sched_clock(); |
416 | |
417 | spin_lock_irqsave(&blkg->stats_lock, flags); |
418 | stats = &blkg->stats; |
419 | if (time_after64(now, io_start_time)) |
420 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], |
421 | now - io_start_time, direction, sync); |
422 | if (time_after64(io_start_time, start_time)) |
423 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], |
424 | io_start_time - start_time, direction, sync); |
425 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
426 | } |
427 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
428 | |
429 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
430 | bool sync) |
431 | { |
432 | unsigned long flags; |
433 | |
434 | spin_lock_irqsave(&blkg->stats_lock, flags); |
435 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_MERGED], 1, direction, |
436 | sync); |
437 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
438 | } |
439 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); |
440 | |
441 | void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
442 | struct blkio_group *blkg, void *key, dev_t dev, |
443 | enum blkio_policy_id plid) |
444 | { |
445 | unsigned long flags; |
446 | |
447 | spin_lock_irqsave(&blkcg->lock, flags); |
448 | spin_lock_init(&blkg->stats_lock); |
449 | rcu_assign_pointer(blkg->key, key); |
450 | blkg->blkcg_id = css_id(&blkcg->css); |
451 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
452 | blkg->plid = plid; |
453 | spin_unlock_irqrestore(&blkcg->lock, flags); |
454 | /* Need to take css reference ? */ |
455 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); |
456 | blkg->dev = dev; |
457 | } |
458 | EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); |
459 | |
460 | static void __blkiocg_del_blkio_group(struct blkio_group *blkg) |
461 | { |
462 | hlist_del_init_rcu(&blkg->blkcg_node); |
463 | blkg->blkcg_id = 0; |
464 | } |
465 | |
466 | /* |
467 | * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 |
468 | * indicating that blk_group was unhashed by the time we got to it. |
469 | */ |
470 | int blkiocg_del_blkio_group(struct blkio_group *blkg) |
471 | { |
472 | struct blkio_cgroup *blkcg; |
473 | unsigned long flags; |
474 | struct cgroup_subsys_state *css; |
475 | int ret = 1; |
476 | |
477 | rcu_read_lock(); |
478 | css = css_lookup(&blkio_subsys, blkg->blkcg_id); |
479 | if (css) { |
480 | blkcg = container_of(css, struct blkio_cgroup, css); |
481 | spin_lock_irqsave(&blkcg->lock, flags); |
482 | if (!hlist_unhashed(&blkg->blkcg_node)) { |
483 | __blkiocg_del_blkio_group(blkg); |
484 | ret = 0; |
485 | } |
486 | spin_unlock_irqrestore(&blkcg->lock, flags); |
487 | } |
488 | |
489 | rcu_read_unlock(); |
490 | return ret; |
491 | } |
492 | EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
493 | |
494 | /* called under rcu_read_lock(). */ |
495 | struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) |
496 | { |
497 | struct blkio_group *blkg; |
498 | struct hlist_node *n; |
499 | void *__key; |
500 | |
501 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
502 | __key = blkg->key; |
503 | if (__key == key) |
504 | return blkg; |
505 | } |
506 | |
507 | return NULL; |
508 | } |
509 | EXPORT_SYMBOL_GPL(blkiocg_lookup_group); |
510 | |
511 | static int |
512 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
513 | { |
514 | struct blkio_cgroup *blkcg; |
515 | struct blkio_group *blkg; |
516 | struct blkio_group_stats *stats; |
517 | struct hlist_node *n; |
518 | uint64_t queued[BLKIO_STAT_TOTAL]; |
519 | int i; |
520 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
521 | bool idling, waiting, empty; |
522 | unsigned long long now = sched_clock(); |
523 | #endif |
524 | |
525 | blkcg = cgroup_to_blkio_cgroup(cgroup); |
526 | spin_lock_irq(&blkcg->lock); |
527 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
528 | spin_lock(&blkg->stats_lock); |
529 | stats = &blkg->stats; |
530 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
531 | idling = blkio_blkg_idling(stats); |
532 | waiting = blkio_blkg_waiting(stats); |
533 | empty = blkio_blkg_empty(stats); |
534 | #endif |
535 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
536 | queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; |
537 | memset(stats, 0, sizeof(struct blkio_group_stats)); |
538 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
539 | stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; |
540 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
541 | if (idling) { |
542 | blkio_mark_blkg_idling(stats); |
543 | stats->start_idle_time = now; |
544 | } |
545 | if (waiting) { |
546 | blkio_mark_blkg_waiting(stats); |
547 | stats->start_group_wait_time = now; |
548 | } |
549 | if (empty) { |
550 | blkio_mark_blkg_empty(stats); |
551 | stats->start_empty_time = now; |
552 | } |
553 | #endif |
554 | spin_unlock(&blkg->stats_lock); |
555 | } |
556 | spin_unlock_irq(&blkcg->lock); |
557 | return 0; |
558 | } |
559 | |
560 | static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str, |
561 | int chars_left, bool diskname_only) |
562 | { |
563 | snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev)); |
564 | chars_left -= strlen(str); |
565 | if (chars_left <= 0) { |
566 | printk(KERN_WARNING |
567 | "Possibly incorrect cgroup stat display format"); |
568 | return; |
569 | } |
570 | if (diskname_only) |
571 | return; |
572 | switch (type) { |
573 | case BLKIO_STAT_READ: |
574 | strlcat(str, " Read", chars_left); |
575 | break; |
576 | case BLKIO_STAT_WRITE: |
577 | strlcat(str, " Write", chars_left); |
578 | break; |
579 | case BLKIO_STAT_SYNC: |
580 | strlcat(str, " Sync", chars_left); |
581 | break; |
582 | case BLKIO_STAT_ASYNC: |
583 | strlcat(str, " Async", chars_left); |
584 | break; |
585 | case BLKIO_STAT_TOTAL: |
586 | strlcat(str, " Total", chars_left); |
587 | break; |
588 | default: |
589 | strlcat(str, " Invalid", chars_left); |
590 | } |
591 | } |
592 | |
593 | static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, |
594 | struct cgroup_map_cb *cb, dev_t dev) |
595 | { |
596 | blkio_get_key_name(0, dev, str, chars_left, true); |
597 | cb->fill(cb, str, val); |
598 | return val; |
599 | } |
600 | |
601 | /* This should be called with blkg->stats_lock held */ |
602 | static uint64_t blkio_get_stat(struct blkio_group *blkg, |
603 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type type) |
604 | { |
605 | uint64_t disk_total; |
606 | char key_str[MAX_KEY_LEN]; |
607 | enum stat_sub_type sub_type; |
608 | |
609 | if (type == BLKIO_STAT_TIME) |
610 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
611 | blkg->stats.time, cb, dev); |
612 | if (type == BLKIO_STAT_SECTORS) |
613 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
614 | blkg->stats.sectors, cb, dev); |
615 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
616 | if (type == BLKIO_STAT_UNACCOUNTED_TIME) |
617 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
618 | blkg->stats.unaccounted_time, cb, dev); |
619 | if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { |
620 | uint64_t sum = blkg->stats.avg_queue_size_sum; |
621 | uint64_t samples = blkg->stats.avg_queue_size_samples; |
622 | if (samples) |
623 | do_div(sum, samples); |
624 | else |
625 | sum = 0; |
626 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev); |
627 | } |
628 | if (type == BLKIO_STAT_GROUP_WAIT_TIME) |
629 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
630 | blkg->stats.group_wait_time, cb, dev); |
631 | if (type == BLKIO_STAT_IDLE_TIME) |
632 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
633 | blkg->stats.idle_time, cb, dev); |
634 | if (type == BLKIO_STAT_EMPTY_TIME) |
635 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
636 | blkg->stats.empty_time, cb, dev); |
637 | if (type == BLKIO_STAT_DEQUEUE) |
638 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
639 | blkg->stats.dequeue, cb, dev); |
640 | #endif |
641 | |
642 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
643 | sub_type++) { |
644 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); |
645 | cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); |
646 | } |
647 | disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + |
648 | blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; |
649 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); |
650 | cb->fill(cb, key_str, disk_total); |
651 | return disk_total; |
652 | } |
653 | |
654 | static int blkio_check_dev_num(dev_t dev) |
655 | { |
656 | int part = 0; |
657 | struct gendisk *disk; |
658 | |
659 | disk = get_gendisk(dev, &part); |
660 | if (!disk || part) |
661 | return -ENODEV; |
662 | |
663 | return 0; |
664 | } |
665 | |
666 | static int blkio_policy_parse_and_set(char *buf, |
667 | struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid) |
668 | { |
669 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
670 | int ret; |
671 | unsigned long major, minor, temp; |
672 | int i = 0; |
673 | dev_t dev; |
674 | u64 bps, iops; |
675 | |
676 | memset(s, 0, sizeof(s)); |
677 | |
678 | while ((p = strsep(&buf, " ")) != NULL) { |
679 | if (!*p) |
680 | continue; |
681 | |
682 | s[i++] = p; |
683 | |
684 | /* Prevent from inputing too many things */ |
685 | if (i == 3) |
686 | break; |
687 | } |
688 | |
689 | if (i != 2) |
690 | return -EINVAL; |
691 | |
692 | p = strsep(&s[0], ":"); |
693 | if (p != NULL) |
694 | major_s = p; |
695 | else |
696 | return -EINVAL; |
697 | |
698 | minor_s = s[0]; |
699 | if (!minor_s) |
700 | return -EINVAL; |
701 | |
702 | ret = strict_strtoul(major_s, 10, &major); |
703 | if (ret) |
704 | return -EINVAL; |
705 | |
706 | ret = strict_strtoul(minor_s, 10, &minor); |
707 | if (ret) |
708 | return -EINVAL; |
709 | |
710 | dev = MKDEV(major, minor); |
711 | |
712 | ret = blkio_check_dev_num(dev); |
713 | if (ret) |
714 | return ret; |
715 | |
716 | newpn->dev = dev; |
717 | |
718 | if (s[1] == NULL) |
719 | return -EINVAL; |
720 | |
721 | switch (plid) { |
722 | case BLKIO_POLICY_PROP: |
723 | ret = strict_strtoul(s[1], 10, &temp); |
724 | if (ret || (temp < BLKIO_WEIGHT_MIN && temp > 0) || |
725 | temp > BLKIO_WEIGHT_MAX) |
726 | return -EINVAL; |
727 | |
728 | newpn->plid = plid; |
729 | newpn->fileid = fileid; |
730 | newpn->val.weight = temp; |
731 | break; |
732 | case BLKIO_POLICY_THROTL: |
733 | switch(fileid) { |
734 | case BLKIO_THROTL_read_bps_device: |
735 | case BLKIO_THROTL_write_bps_device: |
736 | ret = strict_strtoull(s[1], 10, &bps); |
737 | if (ret) |
738 | return -EINVAL; |
739 | |
740 | newpn->plid = plid; |
741 | newpn->fileid = fileid; |
742 | newpn->val.bps = bps; |
743 | break; |
744 | case BLKIO_THROTL_read_iops_device: |
745 | case BLKIO_THROTL_write_iops_device: |
746 | ret = strict_strtoull(s[1], 10, &iops); |
747 | if (ret) |
748 | return -EINVAL; |
749 | |
750 | if (iops > THROTL_IOPS_MAX) |
751 | return -EINVAL; |
752 | |
753 | newpn->plid = plid; |
754 | newpn->fileid = fileid; |
755 | newpn->val.iops = (unsigned int)iops; |
756 | break; |
757 | } |
758 | break; |
759 | default: |
760 | BUG(); |
761 | } |
762 | |
763 | return 0; |
764 | } |
765 | |
766 | unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, |
767 | dev_t dev) |
768 | { |
769 | struct blkio_policy_node *pn; |
770 | |
771 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP, |
772 | BLKIO_PROP_weight_device); |
773 | if (pn) |
774 | return pn->val.weight; |
775 | else |
776 | return blkcg->weight; |
777 | } |
778 | EXPORT_SYMBOL_GPL(blkcg_get_weight); |
779 | |
780 | uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev) |
781 | { |
782 | struct blkio_policy_node *pn; |
783 | |
784 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
785 | BLKIO_THROTL_read_bps_device); |
786 | if (pn) |
787 | return pn->val.bps; |
788 | else |
789 | return -1; |
790 | } |
791 | |
792 | uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev) |
793 | { |
794 | struct blkio_policy_node *pn; |
795 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
796 | BLKIO_THROTL_write_bps_device); |
797 | if (pn) |
798 | return pn->val.bps; |
799 | else |
800 | return -1; |
801 | } |
802 | |
803 | unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev) |
804 | { |
805 | struct blkio_policy_node *pn; |
806 | |
807 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
808 | BLKIO_THROTL_read_iops_device); |
809 | if (pn) |
810 | return pn->val.iops; |
811 | else |
812 | return -1; |
813 | } |
814 | |
815 | unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev) |
816 | { |
817 | struct blkio_policy_node *pn; |
818 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
819 | BLKIO_THROTL_write_iops_device); |
820 | if (pn) |
821 | return pn->val.iops; |
822 | else |
823 | return -1; |
824 | } |
825 | |
826 | /* Checks whether user asked for deleting a policy rule */ |
827 | static bool blkio_delete_rule_command(struct blkio_policy_node *pn) |
828 | { |
829 | switch(pn->plid) { |
830 | case BLKIO_POLICY_PROP: |
831 | if (pn->val.weight == 0) |
832 | return 1; |
833 | break; |
834 | case BLKIO_POLICY_THROTL: |
835 | switch(pn->fileid) { |
836 | case BLKIO_THROTL_read_bps_device: |
837 | case BLKIO_THROTL_write_bps_device: |
838 | if (pn->val.bps == 0) |
839 | return 1; |
840 | break; |
841 | case BLKIO_THROTL_read_iops_device: |
842 | case BLKIO_THROTL_write_iops_device: |
843 | if (pn->val.iops == 0) |
844 | return 1; |
845 | } |
846 | break; |
847 | default: |
848 | BUG(); |
849 | } |
850 | |
851 | return 0; |
852 | } |
853 | |
854 | static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, |
855 | struct blkio_policy_node *newpn) |
856 | { |
857 | switch(oldpn->plid) { |
858 | case BLKIO_POLICY_PROP: |
859 | oldpn->val.weight = newpn->val.weight; |
860 | break; |
861 | case BLKIO_POLICY_THROTL: |
862 | switch(newpn->fileid) { |
863 | case BLKIO_THROTL_read_bps_device: |
864 | case BLKIO_THROTL_write_bps_device: |
865 | oldpn->val.bps = newpn->val.bps; |
866 | break; |
867 | case BLKIO_THROTL_read_iops_device: |
868 | case BLKIO_THROTL_write_iops_device: |
869 | oldpn->val.iops = newpn->val.iops; |
870 | } |
871 | break; |
872 | default: |
873 | BUG(); |
874 | } |
875 | } |
876 | |
877 | /* |
878 | * Some rules/values in blkg have changed. Propagate those to respective |
879 | * policies. |
880 | */ |
881 | static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, |
882 | struct blkio_group *blkg, struct blkio_policy_node *pn) |
883 | { |
884 | unsigned int weight, iops; |
885 | u64 bps; |
886 | |
887 | switch(pn->plid) { |
888 | case BLKIO_POLICY_PROP: |
889 | weight = pn->val.weight ? pn->val.weight : |
890 | blkcg->weight; |
891 | blkio_update_group_weight(blkg, weight); |
892 | break; |
893 | case BLKIO_POLICY_THROTL: |
894 | switch(pn->fileid) { |
895 | case BLKIO_THROTL_read_bps_device: |
896 | case BLKIO_THROTL_write_bps_device: |
897 | bps = pn->val.bps ? pn->val.bps : (-1); |
898 | blkio_update_group_bps(blkg, bps, pn->fileid); |
899 | break; |
900 | case BLKIO_THROTL_read_iops_device: |
901 | case BLKIO_THROTL_write_iops_device: |
902 | iops = pn->val.iops ? pn->val.iops : (-1); |
903 | blkio_update_group_iops(blkg, iops, pn->fileid); |
904 | break; |
905 | } |
906 | break; |
907 | default: |
908 | BUG(); |
909 | } |
910 | } |
911 | |
912 | /* |
913 | * A policy node rule has been updated. Propagate this update to all the |
914 | * block groups which might be affected by this update. |
915 | */ |
916 | static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, |
917 | struct blkio_policy_node *pn) |
918 | { |
919 | struct blkio_group *blkg; |
920 | struct hlist_node *n; |
921 | |
922 | spin_lock(&blkio_list_lock); |
923 | spin_lock_irq(&blkcg->lock); |
924 | |
925 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
926 | if (pn->dev != blkg->dev || pn->plid != blkg->plid) |
927 | continue; |
928 | blkio_update_blkg_policy(blkcg, blkg, pn); |
929 | } |
930 | |
931 | spin_unlock_irq(&blkcg->lock); |
932 | spin_unlock(&blkio_list_lock); |
933 | } |
934 | |
935 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, |
936 | const char *buffer) |
937 | { |
938 | int ret = 0; |
939 | char *buf; |
940 | struct blkio_policy_node *newpn, *pn; |
941 | struct blkio_cgroup *blkcg; |
942 | int keep_newpn = 0; |
943 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
944 | int fileid = BLKIOFILE_ATTR(cft->private); |
945 | |
946 | buf = kstrdup(buffer, GFP_KERNEL); |
947 | if (!buf) |
948 | return -ENOMEM; |
949 | |
950 | newpn = kzalloc(sizeof(*newpn), GFP_KERNEL); |
951 | if (!newpn) { |
952 | ret = -ENOMEM; |
953 | goto free_buf; |
954 | } |
955 | |
956 | ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid); |
957 | if (ret) |
958 | goto free_newpn; |
959 | |
960 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
961 | |
962 | spin_lock_irq(&blkcg->lock); |
963 | |
964 | pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid); |
965 | if (!pn) { |
966 | if (!blkio_delete_rule_command(newpn)) { |
967 | blkio_policy_insert_node(blkcg, newpn); |
968 | keep_newpn = 1; |
969 | } |
970 | spin_unlock_irq(&blkcg->lock); |
971 | goto update_io_group; |
972 | } |
973 | |
974 | if (blkio_delete_rule_command(newpn)) { |
975 | blkio_policy_delete_node(pn); |
976 | spin_unlock_irq(&blkcg->lock); |
977 | goto update_io_group; |
978 | } |
979 | spin_unlock_irq(&blkcg->lock); |
980 | |
981 | blkio_update_policy_rule(pn, newpn); |
982 | |
983 | update_io_group: |
984 | blkio_update_policy_node_blkg(blkcg, newpn); |
985 | |
986 | free_newpn: |
987 | if (!keep_newpn) |
988 | kfree(newpn); |
989 | free_buf: |
990 | kfree(buf); |
991 | return ret; |
992 | } |
993 | |
994 | static void |
995 | blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) |
996 | { |
997 | switch(pn->plid) { |
998 | case BLKIO_POLICY_PROP: |
999 | if (pn->fileid == BLKIO_PROP_weight_device) |
1000 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), |
1001 | MINOR(pn->dev), pn->val.weight); |
1002 | break; |
1003 | case BLKIO_POLICY_THROTL: |
1004 | switch(pn->fileid) { |
1005 | case BLKIO_THROTL_read_bps_device: |
1006 | case BLKIO_THROTL_write_bps_device: |
1007 | seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev), |
1008 | MINOR(pn->dev), pn->val.bps); |
1009 | break; |
1010 | case BLKIO_THROTL_read_iops_device: |
1011 | case BLKIO_THROTL_write_iops_device: |
1012 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), |
1013 | MINOR(pn->dev), pn->val.iops); |
1014 | break; |
1015 | } |
1016 | break; |
1017 | default: |
1018 | BUG(); |
1019 | } |
1020 | } |
1021 | |
1022 | /* cgroup files which read their data from policy nodes end up here */ |
1023 | static void blkio_read_policy_node_files(struct cftype *cft, |
1024 | struct blkio_cgroup *blkcg, struct seq_file *m) |
1025 | { |
1026 | struct blkio_policy_node *pn; |
1027 | |
1028 | if (!list_empty(&blkcg->policy_list)) { |
1029 | spin_lock_irq(&blkcg->lock); |
1030 | list_for_each_entry(pn, &blkcg->policy_list, node) { |
1031 | if (!pn_matches_cftype(cft, pn)) |
1032 | continue; |
1033 | blkio_print_policy_node(m, pn); |
1034 | } |
1035 | spin_unlock_irq(&blkcg->lock); |
1036 | } |
1037 | } |
1038 | |
1039 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, |
1040 | struct seq_file *m) |
1041 | { |
1042 | struct blkio_cgroup *blkcg; |
1043 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1044 | int name = BLKIOFILE_ATTR(cft->private); |
1045 | |
1046 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1047 | |
1048 | switch(plid) { |
1049 | case BLKIO_POLICY_PROP: |
1050 | switch(name) { |
1051 | case BLKIO_PROP_weight_device: |
1052 | blkio_read_policy_node_files(cft, blkcg, m); |
1053 | return 0; |
1054 | default: |
1055 | BUG(); |
1056 | } |
1057 | break; |
1058 | case BLKIO_POLICY_THROTL: |
1059 | switch(name){ |
1060 | case BLKIO_THROTL_read_bps_device: |
1061 | case BLKIO_THROTL_write_bps_device: |
1062 | case BLKIO_THROTL_read_iops_device: |
1063 | case BLKIO_THROTL_write_iops_device: |
1064 | blkio_read_policy_node_files(cft, blkcg, m); |
1065 | return 0; |
1066 | default: |
1067 | BUG(); |
1068 | } |
1069 | break; |
1070 | default: |
1071 | BUG(); |
1072 | } |
1073 | |
1074 | return 0; |
1075 | } |
1076 | |
1077 | static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, |
1078 | struct cftype *cft, struct cgroup_map_cb *cb, enum stat_type type, |
1079 | bool show_total) |
1080 | { |
1081 | struct blkio_group *blkg; |
1082 | struct hlist_node *n; |
1083 | uint64_t cgroup_total = 0; |
1084 | |
1085 | rcu_read_lock(); |
1086 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1087 | if (blkg->dev) { |
1088 | if (!cftype_blkg_same_policy(cft, blkg)) |
1089 | continue; |
1090 | spin_lock_irq(&blkg->stats_lock); |
1091 | cgroup_total += blkio_get_stat(blkg, cb, blkg->dev, |
1092 | type); |
1093 | spin_unlock_irq(&blkg->stats_lock); |
1094 | } |
1095 | } |
1096 | if (show_total) |
1097 | cb->fill(cb, "Total", cgroup_total); |
1098 | rcu_read_unlock(); |
1099 | return 0; |
1100 | } |
1101 | |
1102 | /* All map kind of cgroup file get serviced by this function */ |
1103 | static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, |
1104 | struct cgroup_map_cb *cb) |
1105 | { |
1106 | struct blkio_cgroup *blkcg; |
1107 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1108 | int name = BLKIOFILE_ATTR(cft->private); |
1109 | |
1110 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1111 | |
1112 | switch(plid) { |
1113 | case BLKIO_POLICY_PROP: |
1114 | switch(name) { |
1115 | case BLKIO_PROP_time: |
1116 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1117 | BLKIO_STAT_TIME, 0); |
1118 | case BLKIO_PROP_sectors: |
1119 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1120 | BLKIO_STAT_SECTORS, 0); |
1121 | case BLKIO_PROP_io_service_bytes: |
1122 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1123 | BLKIO_STAT_SERVICE_BYTES, 1); |
1124 | case BLKIO_PROP_io_serviced: |
1125 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1126 | BLKIO_STAT_SERVICED, 1); |
1127 | case BLKIO_PROP_io_service_time: |
1128 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1129 | BLKIO_STAT_SERVICE_TIME, 1); |
1130 | case BLKIO_PROP_io_wait_time: |
1131 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1132 | BLKIO_STAT_WAIT_TIME, 1); |
1133 | case BLKIO_PROP_io_merged: |
1134 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1135 | BLKIO_STAT_MERGED, 1); |
1136 | case BLKIO_PROP_io_queued: |
1137 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1138 | BLKIO_STAT_QUEUED, 1); |
1139 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
1140 | case BLKIO_PROP_unaccounted_time: |
1141 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1142 | BLKIO_STAT_UNACCOUNTED_TIME, 0); |
1143 | case BLKIO_PROP_dequeue: |
1144 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1145 | BLKIO_STAT_DEQUEUE, 0); |
1146 | case BLKIO_PROP_avg_queue_size: |
1147 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1148 | BLKIO_STAT_AVG_QUEUE_SIZE, 0); |
1149 | case BLKIO_PROP_group_wait_time: |
1150 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1151 | BLKIO_STAT_GROUP_WAIT_TIME, 0); |
1152 | case BLKIO_PROP_idle_time: |
1153 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1154 | BLKIO_STAT_IDLE_TIME, 0); |
1155 | case BLKIO_PROP_empty_time: |
1156 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1157 | BLKIO_STAT_EMPTY_TIME, 0); |
1158 | #endif |
1159 | default: |
1160 | BUG(); |
1161 | } |
1162 | break; |
1163 | case BLKIO_POLICY_THROTL: |
1164 | switch(name){ |
1165 | case BLKIO_THROTL_io_service_bytes: |
1166 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1167 | BLKIO_STAT_SERVICE_BYTES, 1); |
1168 | case BLKIO_THROTL_io_serviced: |
1169 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1170 | BLKIO_STAT_SERVICED, 1); |
1171 | default: |
1172 | BUG(); |
1173 | } |
1174 | break; |
1175 | default: |
1176 | BUG(); |
1177 | } |
1178 | |
1179 | return 0; |
1180 | } |
1181 | |
1182 | static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) |
1183 | { |
1184 | struct blkio_group *blkg; |
1185 | struct hlist_node *n; |
1186 | struct blkio_policy_node *pn; |
1187 | |
1188 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) |
1189 | return -EINVAL; |
1190 | |
1191 | spin_lock(&blkio_list_lock); |
1192 | spin_lock_irq(&blkcg->lock); |
1193 | blkcg->weight = (unsigned int)val; |
1194 | |
1195 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1196 | pn = blkio_policy_search_node(blkcg, blkg->dev, |
1197 | BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); |
1198 | if (pn) |
1199 | continue; |
1200 | |
1201 | blkio_update_group_weight(blkg, blkcg->weight); |
1202 | } |
1203 | spin_unlock_irq(&blkcg->lock); |
1204 | spin_unlock(&blkio_list_lock); |
1205 | return 0; |
1206 | } |
1207 | |
1208 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { |
1209 | struct blkio_cgroup *blkcg; |
1210 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1211 | int name = BLKIOFILE_ATTR(cft->private); |
1212 | |
1213 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1214 | |
1215 | switch(plid) { |
1216 | case BLKIO_POLICY_PROP: |
1217 | switch(name) { |
1218 | case BLKIO_PROP_weight: |
1219 | return (u64)blkcg->weight; |
1220 | } |
1221 | break; |
1222 | default: |
1223 | BUG(); |
1224 | } |
1225 | return 0; |
1226 | } |
1227 | |
1228 | static int |
1229 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) |
1230 | { |
1231 | struct blkio_cgroup *blkcg; |
1232 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1233 | int name = BLKIOFILE_ATTR(cft->private); |
1234 | |
1235 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1236 | |
1237 | switch(plid) { |
1238 | case BLKIO_POLICY_PROP: |
1239 | switch(name) { |
1240 | case BLKIO_PROP_weight: |
1241 | return blkio_weight_write(blkcg, val); |
1242 | } |
1243 | break; |
1244 | default: |
1245 | BUG(); |
1246 | } |
1247 | |
1248 | return 0; |
1249 | } |
1250 | |
1251 | struct cftype blkio_files[] = { |
1252 | { |
1253 | .name = "weight_device", |
1254 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1255 | BLKIO_PROP_weight_device), |
1256 | .read_seq_string = blkiocg_file_read, |
1257 | .write_string = blkiocg_file_write, |
1258 | .max_write_len = 256, |
1259 | }, |
1260 | { |
1261 | .name = "weight", |
1262 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1263 | BLKIO_PROP_weight), |
1264 | .read_u64 = blkiocg_file_read_u64, |
1265 | .write_u64 = blkiocg_file_write_u64, |
1266 | }, |
1267 | { |
1268 | .name = "time", |
1269 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1270 | BLKIO_PROP_time), |
1271 | .read_map = blkiocg_file_read_map, |
1272 | }, |
1273 | { |
1274 | .name = "sectors", |
1275 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1276 | BLKIO_PROP_sectors), |
1277 | .read_map = blkiocg_file_read_map, |
1278 | }, |
1279 | { |
1280 | .name = "io_service_bytes", |
1281 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1282 | BLKIO_PROP_io_service_bytes), |
1283 | .read_map = blkiocg_file_read_map, |
1284 | }, |
1285 | { |
1286 | .name = "io_serviced", |
1287 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1288 | BLKIO_PROP_io_serviced), |
1289 | .read_map = blkiocg_file_read_map, |
1290 | }, |
1291 | { |
1292 | .name = "io_service_time", |
1293 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1294 | BLKIO_PROP_io_service_time), |
1295 | .read_map = blkiocg_file_read_map, |
1296 | }, |
1297 | { |
1298 | .name = "io_wait_time", |
1299 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1300 | BLKIO_PROP_io_wait_time), |
1301 | .read_map = blkiocg_file_read_map, |
1302 | }, |
1303 | { |
1304 | .name = "io_merged", |
1305 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1306 | BLKIO_PROP_io_merged), |
1307 | .read_map = blkiocg_file_read_map, |
1308 | }, |
1309 | { |
1310 | .name = "io_queued", |
1311 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1312 | BLKIO_PROP_io_queued), |
1313 | .read_map = blkiocg_file_read_map, |
1314 | }, |
1315 | { |
1316 | .name = "reset_stats", |
1317 | .write_u64 = blkiocg_reset_stats, |
1318 | }, |
1319 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1320 | { |
1321 | .name = "throttle.read_bps_device", |
1322 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1323 | BLKIO_THROTL_read_bps_device), |
1324 | .read_seq_string = blkiocg_file_read, |
1325 | .write_string = blkiocg_file_write, |
1326 | .max_write_len = 256, |
1327 | }, |
1328 | |
1329 | { |
1330 | .name = "throttle.write_bps_device", |
1331 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1332 | BLKIO_THROTL_write_bps_device), |
1333 | .read_seq_string = blkiocg_file_read, |
1334 | .write_string = blkiocg_file_write, |
1335 | .max_write_len = 256, |
1336 | }, |
1337 | |
1338 | { |
1339 | .name = "throttle.read_iops_device", |
1340 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1341 | BLKIO_THROTL_read_iops_device), |
1342 | .read_seq_string = blkiocg_file_read, |
1343 | .write_string = blkiocg_file_write, |
1344 | .max_write_len = 256, |
1345 | }, |
1346 | |
1347 | { |
1348 | .name = "throttle.write_iops_device", |
1349 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1350 | BLKIO_THROTL_write_iops_device), |
1351 | .read_seq_string = blkiocg_file_read, |
1352 | .write_string = blkiocg_file_write, |
1353 | .max_write_len = 256, |
1354 | }, |
1355 | { |
1356 | .name = "throttle.io_service_bytes", |
1357 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1358 | BLKIO_THROTL_io_service_bytes), |
1359 | .read_map = blkiocg_file_read_map, |
1360 | }, |
1361 | { |
1362 | .name = "throttle.io_serviced", |
1363 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1364 | BLKIO_THROTL_io_serviced), |
1365 | .read_map = blkiocg_file_read_map, |
1366 | }, |
1367 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
1368 | |
1369 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
1370 | { |
1371 | .name = "avg_queue_size", |
1372 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1373 | BLKIO_PROP_avg_queue_size), |
1374 | .read_map = blkiocg_file_read_map, |
1375 | }, |
1376 | { |
1377 | .name = "group_wait_time", |
1378 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1379 | BLKIO_PROP_group_wait_time), |
1380 | .read_map = blkiocg_file_read_map, |
1381 | }, |
1382 | { |
1383 | .name = "idle_time", |
1384 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1385 | BLKIO_PROP_idle_time), |
1386 | .read_map = blkiocg_file_read_map, |
1387 | }, |
1388 | { |
1389 | .name = "empty_time", |
1390 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1391 | BLKIO_PROP_empty_time), |
1392 | .read_map = blkiocg_file_read_map, |
1393 | }, |
1394 | { |
1395 | .name = "dequeue", |
1396 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1397 | BLKIO_PROP_dequeue), |
1398 | .read_map = blkiocg_file_read_map, |
1399 | }, |
1400 | { |
1401 | .name = "unaccounted_time", |
1402 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1403 | BLKIO_PROP_unaccounted_time), |
1404 | .read_map = blkiocg_file_read_map, |
1405 | }, |
1406 | #endif |
1407 | }; |
1408 | |
1409 | static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1410 | { |
1411 | return cgroup_add_files(cgroup, subsys, blkio_files, |
1412 | ARRAY_SIZE(blkio_files)); |
1413 | } |
1414 | |
1415 | static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1416 | { |
1417 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
1418 | unsigned long flags; |
1419 | struct blkio_group *blkg; |
1420 | void *key; |
1421 | struct blkio_policy_type *blkiop; |
1422 | struct blkio_policy_node *pn, *pntmp; |
1423 | |
1424 | rcu_read_lock(); |
1425 | do { |
1426 | spin_lock_irqsave(&blkcg->lock, flags); |
1427 | |
1428 | if (hlist_empty(&blkcg->blkg_list)) { |
1429 | spin_unlock_irqrestore(&blkcg->lock, flags); |
1430 | break; |
1431 | } |
1432 | |
1433 | blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, |
1434 | blkcg_node); |
1435 | key = rcu_dereference(blkg->key); |
1436 | __blkiocg_del_blkio_group(blkg); |
1437 | |
1438 | spin_unlock_irqrestore(&blkcg->lock, flags); |
1439 | |
1440 | /* |
1441 | * This blkio_group is being unlinked as associated cgroup is |
1442 | * going away. Let all the IO controlling policies know about |
1443 | * this event. |
1444 | */ |
1445 | spin_lock(&blkio_list_lock); |
1446 | list_for_each_entry(blkiop, &blkio_list, list) { |
1447 | if (blkiop->plid != blkg->plid) |
1448 | continue; |
1449 | blkiop->ops.blkio_unlink_group_fn(key, blkg); |
1450 | } |
1451 | spin_unlock(&blkio_list_lock); |
1452 | } while (1); |
1453 | |
1454 | list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { |
1455 | blkio_policy_delete_node(pn); |
1456 | kfree(pn); |
1457 | } |
1458 | |
1459 | free_css_id(&blkio_subsys, &blkcg->css); |
1460 | rcu_read_unlock(); |
1461 | if (blkcg != &blkio_root_cgroup) |
1462 | kfree(blkcg); |
1463 | } |
1464 | |
1465 | static struct cgroup_subsys_state * |
1466 | blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1467 | { |
1468 | struct blkio_cgroup *blkcg; |
1469 | struct cgroup *parent = cgroup->parent; |
1470 | |
1471 | if (!parent) { |
1472 | blkcg = &blkio_root_cgroup; |
1473 | goto done; |
1474 | } |
1475 | |
1476 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); |
1477 | if (!blkcg) |
1478 | return ERR_PTR(-ENOMEM); |
1479 | |
1480 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; |
1481 | done: |
1482 | spin_lock_init(&blkcg->lock); |
1483 | INIT_HLIST_HEAD(&blkcg->blkg_list); |
1484 | |
1485 | INIT_LIST_HEAD(&blkcg->policy_list); |
1486 | return &blkcg->css; |
1487 | } |
1488 | |
1489 | /* |
1490 | * We cannot support shared io contexts, as we have no mean to support |
1491 | * two tasks with the same ioc in two different groups without major rework |
1492 | * of the main cic data structures. For now we allow a task to change |
1493 | * its cgroup only if it's the only owner of its ioc. |
1494 | */ |
1495 | static int blkiocg_can_attach(struct cgroup_subsys *subsys, |
1496 | struct cgroup *cgroup, struct task_struct *tsk, |
1497 | bool threadgroup) |
1498 | { |
1499 | struct io_context *ioc; |
1500 | int ret = 0; |
1501 | |
1502 | /* task_lock() is needed to avoid races with exit_io_context() */ |
1503 | task_lock(tsk); |
1504 | ioc = tsk->io_context; |
1505 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) |
1506 | ret = -EINVAL; |
1507 | task_unlock(tsk); |
1508 | |
1509 | return ret; |
1510 | } |
1511 | |
1512 | static void blkiocg_attach(struct cgroup_subsys *subsys, struct cgroup *cgroup, |
1513 | struct cgroup *prev, struct task_struct *tsk, |
1514 | bool threadgroup) |
1515 | { |
1516 | struct io_context *ioc; |
1517 | |
1518 | task_lock(tsk); |
1519 | ioc = tsk->io_context; |
1520 | if (ioc) |
1521 | ioc->cgroup_changed = 1; |
1522 | task_unlock(tsk); |
1523 | } |
1524 | |
1525 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
1526 | { |
1527 | spin_lock(&blkio_list_lock); |
1528 | list_add_tail(&blkiop->list, &blkio_list); |
1529 | spin_unlock(&blkio_list_lock); |
1530 | } |
1531 | EXPORT_SYMBOL_GPL(blkio_policy_register); |
1532 | |
1533 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) |
1534 | { |
1535 | spin_lock(&blkio_list_lock); |
1536 | list_del_init(&blkiop->list); |
1537 | spin_unlock(&blkio_list_lock); |
1538 | } |
1539 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); |
1540 | |
1541 | static int __init init_cgroup_blkio(void) |
1542 | { |
1543 | return cgroup_load_subsys(&blkio_subsys); |
1544 | } |
1545 | |
1546 | static void __exit exit_cgroup_blkio(void) |
1547 | { |
1548 | cgroup_unload_subsys(&blkio_subsys); |
1549 | } |
1550 | |
1551 | module_init(init_cgroup_blkio); |
1552 | module_exit(exit_cgroup_blkio); |
1553 | MODULE_LICENSE("GPL"); |
1554 |
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