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Commit | Line | Data |
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31e4c28d VG |
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> | |
22084190 VG |
14 | #include <linux/seq_file.h> |
15 | #include <linux/kdev_t.h> | |
9d6a986c | 16 | #include <linux/module.h> |
accee785 | 17 | #include <linux/err.h> |
9195291e | 18 | #include <linux/blkdev.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
31e4c28d | 20 | #include "blk-cgroup.h" |
34d0f179 | 21 | #include <linux/genhd.h> |
3e252066 | 22 | |
84c124da DS |
23 | #define MAX_KEY_LEN 100 |
24 | ||
3e252066 VG |
25 | static DEFINE_SPINLOCK(blkio_list_lock); |
26 | static LIST_HEAD(blkio_list); | |
b1c35769 | 27 | |
31e4c28d | 28 | struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; |
9d6a986c VG |
29 | EXPORT_SYMBOL_GPL(blkio_root_cgroup); |
30 | ||
67523c48 BB |
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 | ||
062a644d VG |
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 | ||
67523c48 BB |
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 | ||
34d0f179 GJ |
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 | ||
062a644d VG |
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 | ||
34d0f179 GJ |
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 * | |
062a644d VG |
97 | blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev, |
98 | enum blkio_policy_id plid, int fileid) | |
34d0f179 GJ |
99 | { |
100 | struct blkio_policy_node *pn; | |
101 | ||
102 | list_for_each_entry(pn, &blkcg->policy_list, node) { | |
062a644d | 103 | if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid) |
34d0f179 GJ |
104 | return pn; |
105 | } | |
106 | ||
107 | return NULL; | |
108 | } | |
109 | ||
31e4c28d VG |
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 | } | |
9d6a986c | 115 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
31e4c28d | 116 | |
062a644d VG |
117 | static inline void |
118 | blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) | |
119 | { | |
120 | struct blkio_policy_type *blkiop; | |
121 | ||
122 | list_for_each_entry(blkiop, &blkio_list, list) { | |
123 | /* If this policy does not own the blkg, do not send updates */ | |
124 | if (blkiop->plid != blkg->plid) | |
125 | continue; | |
126 | if (blkiop->ops.blkio_update_group_weight_fn) | |
127 | blkiop->ops.blkio_update_group_weight_fn(blkg, weight); | |
128 | } | |
129 | } | |
130 | ||
4c9eefa1 VG |
131 | static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, |
132 | int fileid) | |
133 | { | |
134 | struct blkio_policy_type *blkiop; | |
135 | ||
136 | list_for_each_entry(blkiop, &blkio_list, list) { | |
137 | ||
138 | /* If this policy does not own the blkg, do not send updates */ | |
139 | if (blkiop->plid != blkg->plid) | |
140 | continue; | |
141 | ||
142 | if (fileid == BLKIO_THROTL_read_bps_device | |
143 | && blkiop->ops.blkio_update_group_read_bps_fn) | |
144 | blkiop->ops.blkio_update_group_read_bps_fn(blkg, bps); | |
145 | ||
146 | if (fileid == BLKIO_THROTL_write_bps_device | |
147 | && blkiop->ops.blkio_update_group_write_bps_fn) | |
148 | blkiop->ops.blkio_update_group_write_bps_fn(blkg, bps); | |
149 | } | |
150 | } | |
151 | ||
7702e8f4 VG |
152 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
153 | unsigned int iops, int fileid) | |
154 | { | |
155 | struct blkio_policy_type *blkiop; | |
156 | ||
157 | list_for_each_entry(blkiop, &blkio_list, list) { | |
158 | ||
159 | /* If this policy does not own the blkg, do not send updates */ | |
160 | if (blkiop->plid != blkg->plid) | |
161 | continue; | |
162 | ||
163 | if (fileid == BLKIO_THROTL_read_iops_device | |
164 | && blkiop->ops.blkio_update_group_read_iops_fn) | |
165 | blkiop->ops.blkio_update_group_read_iops_fn(blkg, iops); | |
166 | ||
167 | if (fileid == BLKIO_THROTL_write_iops_device | |
168 | && blkiop->ops.blkio_update_group_write_iops_fn) | |
169 | blkiop->ops.blkio_update_group_write_iops_fn(blkg,iops); | |
170 | } | |
171 | } | |
172 | ||
9195291e DS |
173 | /* |
174 | * Add to the appropriate stat variable depending on the request type. | |
175 | * This should be called with the blkg->stats_lock held. | |
176 | */ | |
84c124da DS |
177 | static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, |
178 | bool sync) | |
9195291e | 179 | { |
84c124da DS |
180 | if (direction) |
181 | stat[BLKIO_STAT_WRITE] += add; | |
9195291e | 182 | else |
84c124da DS |
183 | stat[BLKIO_STAT_READ] += add; |
184 | if (sync) | |
185 | stat[BLKIO_STAT_SYNC] += add; | |
9195291e | 186 | else |
84c124da | 187 | stat[BLKIO_STAT_ASYNC] += add; |
9195291e DS |
188 | } |
189 | ||
cdc1184c DS |
190 | /* |
191 | * Decrements the appropriate stat variable if non-zero depending on the | |
192 | * request type. Panics on value being zero. | |
193 | * This should be called with the blkg->stats_lock held. | |
194 | */ | |
195 | static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) | |
196 | { | |
197 | if (direction) { | |
198 | BUG_ON(stat[BLKIO_STAT_WRITE] == 0); | |
199 | stat[BLKIO_STAT_WRITE]--; | |
200 | } else { | |
201 | BUG_ON(stat[BLKIO_STAT_READ] == 0); | |
202 | stat[BLKIO_STAT_READ]--; | |
203 | } | |
204 | if (sync) { | |
205 | BUG_ON(stat[BLKIO_STAT_SYNC] == 0); | |
206 | stat[BLKIO_STAT_SYNC]--; | |
207 | } else { | |
208 | BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); | |
209 | stat[BLKIO_STAT_ASYNC]--; | |
210 | } | |
211 | } | |
212 | ||
213 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
812df48d DS |
214 | /* This should be called with the blkg->stats_lock held. */ |
215 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, | |
216 | struct blkio_group *curr_blkg) | |
217 | { | |
218 | if (blkio_blkg_waiting(&blkg->stats)) | |
219 | return; | |
220 | if (blkg == curr_blkg) | |
221 | return; | |
222 | blkg->stats.start_group_wait_time = sched_clock(); | |
223 | blkio_mark_blkg_waiting(&blkg->stats); | |
224 | } | |
225 | ||
226 | /* This should be called with the blkg->stats_lock held. */ | |
227 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) | |
228 | { | |
229 | unsigned long long now; | |
230 | ||
231 | if (!blkio_blkg_waiting(stats)) | |
232 | return; | |
233 | ||
234 | now = sched_clock(); | |
235 | if (time_after64(now, stats->start_group_wait_time)) | |
236 | stats->group_wait_time += now - stats->start_group_wait_time; | |
237 | blkio_clear_blkg_waiting(stats); | |
238 | } | |
239 | ||
240 | /* This should be called with the blkg->stats_lock held. */ | |
241 | static void blkio_end_empty_time(struct blkio_group_stats *stats) | |
242 | { | |
243 | unsigned long long now; | |
244 | ||
245 | if (!blkio_blkg_empty(stats)) | |
246 | return; | |
247 | ||
248 | now = sched_clock(); | |
249 | if (time_after64(now, stats->start_empty_time)) | |
250 | stats->empty_time += now - stats->start_empty_time; | |
251 | blkio_clear_blkg_empty(stats); | |
252 | } | |
253 | ||
254 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) | |
255 | { | |
256 | unsigned long flags; | |
257 | ||
258 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
259 | BUG_ON(blkio_blkg_idling(&blkg->stats)); | |
260 | blkg->stats.start_idle_time = sched_clock(); | |
261 | blkio_mark_blkg_idling(&blkg->stats); | |
262 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); | |
265 | ||
266 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg) | |
267 | { | |
268 | unsigned long flags; | |
269 | unsigned long long now; | |
270 | struct blkio_group_stats *stats; | |
271 | ||
272 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
273 | stats = &blkg->stats; | |
274 | if (blkio_blkg_idling(stats)) { | |
275 | now = sched_clock(); | |
276 | if (time_after64(now, stats->start_idle_time)) | |
277 | stats->idle_time += now - stats->start_idle_time; | |
278 | blkio_clear_blkg_idling(stats); | |
279 | } | |
280 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); | |
283 | ||
a11cdaa7 | 284 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
cdc1184c DS |
285 | { |
286 | unsigned long flags; | |
287 | struct blkio_group_stats *stats; | |
288 | ||
289 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
290 | stats = &blkg->stats; | |
291 | stats->avg_queue_size_sum += | |
292 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + | |
293 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; | |
294 | stats->avg_queue_size_samples++; | |
812df48d | 295 | blkio_update_group_wait_time(stats); |
cdc1184c DS |
296 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
297 | } | |
a11cdaa7 DS |
298 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
299 | ||
e5ff082e | 300 | void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
28baf442 DS |
301 | { |
302 | unsigned long flags; | |
303 | struct blkio_group_stats *stats; | |
304 | ||
305 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
306 | stats = &blkg->stats; | |
307 | ||
308 | if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || | |
309 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { | |
310 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
311 | return; | |
312 | } | |
313 | ||
314 | /* | |
e5ff082e VG |
315 | * group is already marked empty. This can happen if cfqq got new |
316 | * request in parent group and moved to this group while being added | |
317 | * to service tree. Just ignore the event and move on. | |
28baf442 | 318 | */ |
e5ff082e VG |
319 | if(blkio_blkg_empty(stats)) { |
320 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
321 | return; | |
322 | } | |
323 | ||
28baf442 DS |
324 | stats->start_empty_time = sched_clock(); |
325 | blkio_mark_blkg_empty(stats); | |
326 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); | |
329 | ||
a11cdaa7 DS |
330 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
331 | unsigned long dequeue) | |
332 | { | |
333 | blkg->stats.dequeue += dequeue; | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); | |
812df48d DS |
336 | #else |
337 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, | |
338 | struct blkio_group *curr_blkg) {} | |
339 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} | |
cdc1184c DS |
340 | #endif |
341 | ||
a11cdaa7 | 342 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
cdc1184c DS |
343 | struct blkio_group *curr_blkg, bool direction, |
344 | bool sync) | |
345 | { | |
346 | unsigned long flags; | |
347 | ||
348 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
349 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, | |
350 | sync); | |
812df48d DS |
351 | blkio_end_empty_time(&blkg->stats); |
352 | blkio_set_start_group_wait_time(blkg, curr_blkg); | |
cdc1184c DS |
353 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
354 | } | |
a11cdaa7 | 355 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
cdc1184c | 356 | |
a11cdaa7 | 357 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
cdc1184c DS |
358 | bool direction, bool sync) |
359 | { | |
360 | unsigned long flags; | |
361 | ||
362 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
363 | blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], | |
364 | direction, sync); | |
365 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
366 | } | |
a11cdaa7 | 367 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
cdc1184c | 368 | |
303a3acb | 369 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time) |
22084190 | 370 | { |
303a3acb DS |
371 | unsigned long flags; |
372 | ||
373 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
374 | blkg->stats.time += time; | |
375 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
22084190 | 376 | } |
303a3acb | 377 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
22084190 | 378 | |
84c124da DS |
379 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
380 | uint64_t bytes, bool direction, bool sync) | |
9195291e DS |
381 | { |
382 | struct blkio_group_stats *stats; | |
383 | unsigned long flags; | |
384 | ||
385 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
386 | stats = &blkg->stats; | |
84c124da DS |
387 | stats->sectors += bytes >> 9; |
388 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICED], 1, direction, | |
389 | sync); | |
390 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_BYTES], bytes, | |
391 | direction, sync); | |
9195291e DS |
392 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
393 | } | |
84c124da | 394 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
9195291e | 395 | |
84c124da DS |
396 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
397 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) | |
9195291e DS |
398 | { |
399 | struct blkio_group_stats *stats; | |
400 | unsigned long flags; | |
401 | unsigned long long now = sched_clock(); | |
402 | ||
403 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
404 | stats = &blkg->stats; | |
84c124da DS |
405 | if (time_after64(now, io_start_time)) |
406 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], | |
407 | now - io_start_time, direction, sync); | |
408 | if (time_after64(io_start_time, start_time)) | |
409 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], | |
410 | io_start_time - start_time, direction, sync); | |
9195291e DS |
411 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
412 | } | |
84c124da | 413 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
9195291e | 414 | |
812d4026 DS |
415 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
416 | bool sync) | |
417 | { | |
418 | unsigned long flags; | |
419 | ||
420 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
421 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_MERGED], 1, direction, | |
422 | sync); | |
423 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); | |
426 | ||
31e4c28d | 427 | void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
062a644d VG |
428 | struct blkio_group *blkg, void *key, dev_t dev, |
429 | enum blkio_policy_id plid) | |
31e4c28d VG |
430 | { |
431 | unsigned long flags; | |
432 | ||
433 | spin_lock_irqsave(&blkcg->lock, flags); | |
8d2a91f8 | 434 | spin_lock_init(&blkg->stats_lock); |
31e4c28d | 435 | rcu_assign_pointer(blkg->key, key); |
b1c35769 | 436 | blkg->blkcg_id = css_id(&blkcg->css); |
31e4c28d | 437 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
062a644d | 438 | blkg->plid = plid; |
31e4c28d | 439 | spin_unlock_irqrestore(&blkcg->lock, flags); |
2868ef7b VG |
440 | /* Need to take css reference ? */ |
441 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); | |
22084190 | 442 | blkg->dev = dev; |
31e4c28d | 443 | } |
9d6a986c | 444 | EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); |
31e4c28d | 445 | |
b1c35769 VG |
446 | static void __blkiocg_del_blkio_group(struct blkio_group *blkg) |
447 | { | |
448 | hlist_del_init_rcu(&blkg->blkcg_node); | |
449 | blkg->blkcg_id = 0; | |
450 | } | |
451 | ||
452 | /* | |
453 | * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 | |
454 | * indicating that blk_group was unhashed by the time we got to it. | |
455 | */ | |
31e4c28d VG |
456 | int blkiocg_del_blkio_group(struct blkio_group *blkg) |
457 | { | |
b1c35769 VG |
458 | struct blkio_cgroup *blkcg; |
459 | unsigned long flags; | |
460 | struct cgroup_subsys_state *css; | |
461 | int ret = 1; | |
462 | ||
463 | rcu_read_lock(); | |
464 | css = css_lookup(&blkio_subsys, blkg->blkcg_id); | |
0f3942a3 JA |
465 | if (css) { |
466 | blkcg = container_of(css, struct blkio_cgroup, css); | |
467 | spin_lock_irqsave(&blkcg->lock, flags); | |
468 | if (!hlist_unhashed(&blkg->blkcg_node)) { | |
469 | __blkiocg_del_blkio_group(blkg); | |
470 | ret = 0; | |
471 | } | |
472 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
b1c35769 | 473 | } |
0f3942a3 | 474 | |
b1c35769 VG |
475 | rcu_read_unlock(); |
476 | return ret; | |
31e4c28d | 477 | } |
9d6a986c | 478 | EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
31e4c28d VG |
479 | |
480 | /* called under rcu_read_lock(). */ | |
481 | struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) | |
482 | { | |
483 | struct blkio_group *blkg; | |
484 | struct hlist_node *n; | |
485 | void *__key; | |
486 | ||
487 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
488 | __key = blkg->key; | |
489 | if (__key == key) | |
490 | return blkg; | |
491 | } | |
492 | ||
493 | return NULL; | |
494 | } | |
9d6a986c | 495 | EXPORT_SYMBOL_GPL(blkiocg_lookup_group); |
31e4c28d | 496 | |
303a3acb | 497 | static int |
84c124da | 498 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
303a3acb DS |
499 | { |
500 | struct blkio_cgroup *blkcg; | |
501 | struct blkio_group *blkg; | |
812df48d | 502 | struct blkio_group_stats *stats; |
303a3acb | 503 | struct hlist_node *n; |
cdc1184c DS |
504 | uint64_t queued[BLKIO_STAT_TOTAL]; |
505 | int i; | |
812df48d DS |
506 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
507 | bool idling, waiting, empty; | |
508 | unsigned long long now = sched_clock(); | |
509 | #endif | |
303a3acb DS |
510 | |
511 | blkcg = cgroup_to_blkio_cgroup(cgroup); | |
512 | spin_lock_irq(&blkcg->lock); | |
513 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
514 | spin_lock(&blkg->stats_lock); | |
812df48d DS |
515 | stats = &blkg->stats; |
516 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
517 | idling = blkio_blkg_idling(stats); | |
518 | waiting = blkio_blkg_waiting(stats); | |
519 | empty = blkio_blkg_empty(stats); | |
520 | #endif | |
cdc1184c | 521 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
812df48d DS |
522 | queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; |
523 | memset(stats, 0, sizeof(struct blkio_group_stats)); | |
cdc1184c | 524 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
812df48d DS |
525 | stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; |
526 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
527 | if (idling) { | |
528 | blkio_mark_blkg_idling(stats); | |
529 | stats->start_idle_time = now; | |
530 | } | |
531 | if (waiting) { | |
532 | blkio_mark_blkg_waiting(stats); | |
533 | stats->start_group_wait_time = now; | |
534 | } | |
535 | if (empty) { | |
536 | blkio_mark_blkg_empty(stats); | |
537 | stats->start_empty_time = now; | |
538 | } | |
539 | #endif | |
303a3acb DS |
540 | spin_unlock(&blkg->stats_lock); |
541 | } | |
542 | spin_unlock_irq(&blkcg->lock); | |
543 | return 0; | |
544 | } | |
545 | ||
84c124da DS |
546 | static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str, |
547 | int chars_left, bool diskname_only) | |
303a3acb | 548 | { |
84c124da | 549 | snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev)); |
303a3acb DS |
550 | chars_left -= strlen(str); |
551 | if (chars_left <= 0) { | |
552 | printk(KERN_WARNING | |
553 | "Possibly incorrect cgroup stat display format"); | |
554 | return; | |
555 | } | |
84c124da DS |
556 | if (diskname_only) |
557 | return; | |
303a3acb | 558 | switch (type) { |
84c124da | 559 | case BLKIO_STAT_READ: |
303a3acb DS |
560 | strlcat(str, " Read", chars_left); |
561 | break; | |
84c124da | 562 | case BLKIO_STAT_WRITE: |
303a3acb DS |
563 | strlcat(str, " Write", chars_left); |
564 | break; | |
84c124da | 565 | case BLKIO_STAT_SYNC: |
303a3acb DS |
566 | strlcat(str, " Sync", chars_left); |
567 | break; | |
84c124da | 568 | case BLKIO_STAT_ASYNC: |
303a3acb DS |
569 | strlcat(str, " Async", chars_left); |
570 | break; | |
84c124da | 571 | case BLKIO_STAT_TOTAL: |
303a3acb DS |
572 | strlcat(str, " Total", chars_left); |
573 | break; | |
574 | default: | |
575 | strlcat(str, " Invalid", chars_left); | |
576 | } | |
577 | } | |
578 | ||
84c124da DS |
579 | static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, |
580 | struct cgroup_map_cb *cb, dev_t dev) | |
581 | { | |
582 | blkio_get_key_name(0, dev, str, chars_left, true); | |
583 | cb->fill(cb, str, val); | |
584 | return val; | |
585 | } | |
303a3acb | 586 | |
84c124da DS |
587 | /* This should be called with blkg->stats_lock held */ |
588 | static uint64_t blkio_get_stat(struct blkio_group *blkg, | |
589 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type type) | |
303a3acb DS |
590 | { |
591 | uint64_t disk_total; | |
592 | char key_str[MAX_KEY_LEN]; | |
84c124da DS |
593 | enum stat_sub_type sub_type; |
594 | ||
595 | if (type == BLKIO_STAT_TIME) | |
596 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
597 | blkg->stats.time, cb, dev); | |
598 | if (type == BLKIO_STAT_SECTORS) | |
599 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
600 | blkg->stats.sectors, cb, dev); | |
601 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
cdc1184c DS |
602 | if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { |
603 | uint64_t sum = blkg->stats.avg_queue_size_sum; | |
604 | uint64_t samples = blkg->stats.avg_queue_size_samples; | |
605 | if (samples) | |
606 | do_div(sum, samples); | |
607 | else | |
608 | sum = 0; | |
609 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev); | |
610 | } | |
812df48d DS |
611 | if (type == BLKIO_STAT_GROUP_WAIT_TIME) |
612 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
613 | blkg->stats.group_wait_time, cb, dev); | |
614 | if (type == BLKIO_STAT_IDLE_TIME) | |
615 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
616 | blkg->stats.idle_time, cb, dev); | |
617 | if (type == BLKIO_STAT_EMPTY_TIME) | |
618 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
619 | blkg->stats.empty_time, cb, dev); | |
84c124da DS |
620 | if (type == BLKIO_STAT_DEQUEUE) |
621 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
622 | blkg->stats.dequeue, cb, dev); | |
623 | #endif | |
303a3acb | 624 | |
84c124da DS |
625 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
626 | sub_type++) { | |
627 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); | |
628 | cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); | |
303a3acb | 629 | } |
84c124da DS |
630 | disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + |
631 | blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; | |
632 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); | |
303a3acb DS |
633 | cb->fill(cb, key_str, disk_total); |
634 | return disk_total; | |
635 | } | |
636 | ||
34d0f179 GJ |
637 | static int blkio_check_dev_num(dev_t dev) |
638 | { | |
639 | int part = 0; | |
640 | struct gendisk *disk; | |
641 | ||
642 | disk = get_gendisk(dev, &part); | |
643 | if (!disk || part) | |
644 | return -ENODEV; | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | static int blkio_policy_parse_and_set(char *buf, | |
062a644d | 650 | struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid) |
34d0f179 GJ |
651 | { |
652 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; | |
653 | int ret; | |
7702e8f4 | 654 | unsigned long major, minor, temp, iops; |
34d0f179 GJ |
655 | int i = 0; |
656 | dev_t dev; | |
4c9eefa1 | 657 | u64 bps; |
34d0f179 GJ |
658 | |
659 | memset(s, 0, sizeof(s)); | |
660 | ||
661 | while ((p = strsep(&buf, " ")) != NULL) { | |
662 | if (!*p) | |
663 | continue; | |
664 | ||
665 | s[i++] = p; | |
666 | ||
667 | /* Prevent from inputing too many things */ | |
668 | if (i == 3) | |
669 | break; | |
670 | } | |
671 | ||
672 | if (i != 2) | |
673 | return -EINVAL; | |
674 | ||
675 | p = strsep(&s[0], ":"); | |
676 | if (p != NULL) | |
677 | major_s = p; | |
678 | else | |
679 | return -EINVAL; | |
680 | ||
681 | minor_s = s[0]; | |
682 | if (!minor_s) | |
683 | return -EINVAL; | |
684 | ||
685 | ret = strict_strtoul(major_s, 10, &major); | |
686 | if (ret) | |
687 | return -EINVAL; | |
688 | ||
689 | ret = strict_strtoul(minor_s, 10, &minor); | |
690 | if (ret) | |
691 | return -EINVAL; | |
692 | ||
693 | dev = MKDEV(major, minor); | |
694 | ||
695 | ret = blkio_check_dev_num(dev); | |
696 | if (ret) | |
697 | return ret; | |
698 | ||
699 | newpn->dev = dev; | |
700 | ||
701 | if (s[1] == NULL) | |
702 | return -EINVAL; | |
703 | ||
062a644d VG |
704 | switch (plid) { |
705 | case BLKIO_POLICY_PROP: | |
706 | ret = strict_strtoul(s[1], 10, &temp); | |
707 | if (ret || (temp < BLKIO_WEIGHT_MIN && temp > 0) || | |
708 | temp > BLKIO_WEIGHT_MAX) | |
709 | return -EINVAL; | |
34d0f179 | 710 | |
062a644d VG |
711 | newpn->plid = plid; |
712 | newpn->fileid = fileid; | |
4c9eefa1 VG |
713 | newpn->val.weight = temp; |
714 | break; | |
715 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
716 | switch(fileid) { |
717 | case BLKIO_THROTL_read_bps_device: | |
718 | case BLKIO_THROTL_write_bps_device: | |
719 | ret = strict_strtoull(s[1], 10, &bps); | |
720 | if (ret) | |
721 | return -EINVAL; | |
4c9eefa1 | 722 | |
7702e8f4 VG |
723 | newpn->plid = plid; |
724 | newpn->fileid = fileid; | |
725 | newpn->val.bps = bps; | |
726 | break; | |
727 | case BLKIO_THROTL_read_iops_device: | |
728 | case BLKIO_THROTL_write_iops_device: | |
729 | ret = strict_strtoul(s[1], 10, &iops); | |
730 | if (ret) | |
731 | return -EINVAL; | |
732 | ||
733 | newpn->plid = plid; | |
734 | newpn->fileid = fileid; | |
735 | newpn->val.iops = iops; | |
736 | break; | |
737 | } | |
062a644d VG |
738 | break; |
739 | default: | |
740 | BUG(); | |
741 | } | |
34d0f179 GJ |
742 | |
743 | return 0; | |
744 | } | |
745 | ||
746 | unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, | |
747 | dev_t dev) | |
748 | { | |
749 | struct blkio_policy_node *pn; | |
750 | ||
062a644d VG |
751 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP, |
752 | BLKIO_PROP_weight_device); | |
34d0f179 | 753 | if (pn) |
4c9eefa1 | 754 | return pn->val.weight; |
34d0f179 GJ |
755 | else |
756 | return blkcg->weight; | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(blkcg_get_weight); | |
759 | ||
4c9eefa1 VG |
760 | uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev) |
761 | { | |
762 | struct blkio_policy_node *pn; | |
763 | ||
764 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, | |
765 | BLKIO_THROTL_read_bps_device); | |
766 | if (pn) | |
767 | return pn->val.bps; | |
768 | else | |
769 | return -1; | |
770 | } | |
771 | ||
772 | uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev) | |
773 | { | |
774 | struct blkio_policy_node *pn; | |
775 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, | |
776 | BLKIO_THROTL_write_bps_device); | |
777 | if (pn) | |
778 | return pn->val.bps; | |
779 | else | |
780 | return -1; | |
781 | } | |
782 | ||
7702e8f4 VG |
783 | unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev) |
784 | { | |
785 | struct blkio_policy_node *pn; | |
786 | ||
787 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, | |
788 | BLKIO_THROTL_read_iops_device); | |
789 | if (pn) | |
790 | return pn->val.iops; | |
791 | else | |
792 | return -1; | |
793 | } | |
794 | ||
795 | unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev) | |
796 | { | |
797 | struct blkio_policy_node *pn; | |
798 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, | |
799 | BLKIO_THROTL_write_iops_device); | |
800 | if (pn) | |
801 | return pn->val.iops; | |
802 | else | |
803 | return -1; | |
804 | } | |
805 | ||
062a644d VG |
806 | /* Checks whether user asked for deleting a policy rule */ |
807 | static bool blkio_delete_rule_command(struct blkio_policy_node *pn) | |
808 | { | |
809 | switch(pn->plid) { | |
810 | case BLKIO_POLICY_PROP: | |
4c9eefa1 VG |
811 | if (pn->val.weight == 0) |
812 | return 1; | |
813 | break; | |
814 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
815 | switch(pn->fileid) { |
816 | case BLKIO_THROTL_read_bps_device: | |
817 | case BLKIO_THROTL_write_bps_device: | |
818 | if (pn->val.bps == 0) | |
819 | return 1; | |
820 | break; | |
821 | case BLKIO_THROTL_read_iops_device: | |
822 | case BLKIO_THROTL_write_iops_device: | |
823 | if (pn->val.iops == 0) | |
824 | return 1; | |
825 | } | |
062a644d VG |
826 | break; |
827 | default: | |
828 | BUG(); | |
829 | } | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
834 | static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, | |
835 | struct blkio_policy_node *newpn) | |
836 | { | |
837 | switch(oldpn->plid) { | |
838 | case BLKIO_POLICY_PROP: | |
4c9eefa1 VG |
839 | oldpn->val.weight = newpn->val.weight; |
840 | break; | |
841 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
842 | switch(newpn->fileid) { |
843 | case BLKIO_THROTL_read_bps_device: | |
844 | case BLKIO_THROTL_write_bps_device: | |
845 | oldpn->val.bps = newpn->val.bps; | |
846 | break; | |
847 | case BLKIO_THROTL_read_iops_device: | |
848 | case BLKIO_THROTL_write_iops_device: | |
849 | oldpn->val.iops = newpn->val.iops; | |
850 | } | |
062a644d VG |
851 | break; |
852 | default: | |
853 | BUG(); | |
854 | } | |
855 | } | |
856 | ||
857 | /* | |
858 | * Some rules/values in blkg have changed. Propogate those to respective | |
859 | * policies. | |
860 | */ | |
861 | static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, | |
862 | struct blkio_group *blkg, struct blkio_policy_node *pn) | |
863 | { | |
7702e8f4 | 864 | unsigned int weight, iops; |
4c9eefa1 | 865 | u64 bps; |
062a644d VG |
866 | |
867 | switch(pn->plid) { | |
868 | case BLKIO_POLICY_PROP: | |
4c9eefa1 | 869 | weight = pn->val.weight ? pn->val.weight : |
062a644d VG |
870 | blkcg->weight; |
871 | blkio_update_group_weight(blkg, weight); | |
872 | break; | |
4c9eefa1 VG |
873 | case BLKIO_POLICY_THROTL: |
874 | switch(pn->fileid) { | |
875 | case BLKIO_THROTL_read_bps_device: | |
876 | case BLKIO_THROTL_write_bps_device: | |
877 | bps = pn->val.bps ? pn->val.bps : (-1); | |
878 | blkio_update_group_bps(blkg, bps, pn->fileid); | |
879 | break; | |
7702e8f4 VG |
880 | case BLKIO_THROTL_read_iops_device: |
881 | case BLKIO_THROTL_write_iops_device: | |
882 | iops = pn->val.iops ? pn->val.iops : (-1); | |
883 | blkio_update_group_iops(blkg, iops, pn->fileid); | |
884 | break; | |
4c9eefa1 VG |
885 | } |
886 | break; | |
062a644d VG |
887 | default: |
888 | BUG(); | |
889 | } | |
890 | } | |
891 | ||
892 | /* | |
893 | * A policy node rule has been updated. Propogate this update to all the | |
894 | * block groups which might be affected by this update. | |
895 | */ | |
896 | static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, | |
897 | struct blkio_policy_node *pn) | |
898 | { | |
899 | struct blkio_group *blkg; | |
900 | struct hlist_node *n; | |
901 | ||
902 | spin_lock(&blkio_list_lock); | |
903 | spin_lock_irq(&blkcg->lock); | |
34d0f179 | 904 | |
062a644d VG |
905 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
906 | if (pn->dev != blkg->dev || pn->plid != blkg->plid) | |
907 | continue; | |
908 | blkio_update_blkg_policy(blkcg, blkg, pn); | |
909 | } | |
910 | ||
911 | spin_unlock_irq(&blkcg->lock); | |
912 | spin_unlock(&blkio_list_lock); | |
913 | } | |
914 | ||
915 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, | |
916 | const char *buffer) | |
34d0f179 GJ |
917 | { |
918 | int ret = 0; | |
919 | char *buf; | |
920 | struct blkio_policy_node *newpn, *pn; | |
921 | struct blkio_cgroup *blkcg; | |
34d0f179 | 922 | int keep_newpn = 0; |
062a644d VG |
923 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
924 | int fileid = BLKIOFILE_ATTR(cft->private); | |
34d0f179 GJ |
925 | |
926 | buf = kstrdup(buffer, GFP_KERNEL); | |
927 | if (!buf) | |
928 | return -ENOMEM; | |
929 | ||
930 | newpn = kzalloc(sizeof(*newpn), GFP_KERNEL); | |
931 | if (!newpn) { | |
932 | ret = -ENOMEM; | |
933 | goto free_buf; | |
934 | } | |
935 | ||
062a644d | 936 | ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid); |
34d0f179 GJ |
937 | if (ret) |
938 | goto free_newpn; | |
939 | ||
940 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
941 | ||
942 | spin_lock_irq(&blkcg->lock); | |
943 | ||
062a644d | 944 | pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid); |
34d0f179 | 945 | if (!pn) { |
062a644d | 946 | if (!blkio_delete_rule_command(newpn)) { |
34d0f179 GJ |
947 | blkio_policy_insert_node(blkcg, newpn); |
948 | keep_newpn = 1; | |
949 | } | |
950 | spin_unlock_irq(&blkcg->lock); | |
951 | goto update_io_group; | |
952 | } | |
953 | ||
062a644d | 954 | if (blkio_delete_rule_command(newpn)) { |
34d0f179 GJ |
955 | blkio_policy_delete_node(pn); |
956 | spin_unlock_irq(&blkcg->lock); | |
957 | goto update_io_group; | |
958 | } | |
959 | spin_unlock_irq(&blkcg->lock); | |
960 | ||
062a644d | 961 | blkio_update_policy_rule(pn, newpn); |
34d0f179 GJ |
962 | |
963 | update_io_group: | |
062a644d | 964 | blkio_update_policy_node_blkg(blkcg, newpn); |
34d0f179 GJ |
965 | |
966 | free_newpn: | |
967 | if (!keep_newpn) | |
968 | kfree(newpn); | |
969 | free_buf: | |
970 | kfree(buf); | |
971 | return ret; | |
972 | } | |
973 | ||
062a644d VG |
974 | static void |
975 | blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) | |
976 | { | |
977 | switch(pn->plid) { | |
978 | case BLKIO_POLICY_PROP: | |
979 | if (pn->fileid == BLKIO_PROP_weight_device) | |
980 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), | |
4c9eefa1 VG |
981 | MINOR(pn->dev), pn->val.weight); |
982 | break; | |
983 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
984 | switch(pn->fileid) { |
985 | case BLKIO_THROTL_read_bps_device: | |
986 | case BLKIO_THROTL_write_bps_device: | |
4c9eefa1 VG |
987 | seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev), |
988 | MINOR(pn->dev), pn->val.bps); | |
7702e8f4 VG |
989 | break; |
990 | case BLKIO_THROTL_read_iops_device: | |
991 | case BLKIO_THROTL_write_iops_device: | |
992 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), | |
993 | MINOR(pn->dev), pn->val.iops); | |
994 | break; | |
995 | } | |
062a644d VG |
996 | break; |
997 | default: | |
998 | BUG(); | |
999 | } | |
1000 | } | |
1001 | ||
1002 | /* cgroup files which read their data from policy nodes end up here */ | |
1003 | static void blkio_read_policy_node_files(struct cftype *cft, | |
1004 | struct blkio_cgroup *blkcg, struct seq_file *m) | |
34d0f179 | 1005 | { |
34d0f179 GJ |
1006 | struct blkio_policy_node *pn; |
1007 | ||
0f3942a3 JA |
1008 | if (!list_empty(&blkcg->policy_list)) { |
1009 | spin_lock_irq(&blkcg->lock); | |
1010 | list_for_each_entry(pn, &blkcg->policy_list, node) { | |
062a644d VG |
1011 | if (!pn_matches_cftype(cft, pn)) |
1012 | continue; | |
1013 | blkio_print_policy_node(m, pn); | |
0f3942a3 JA |
1014 | } |
1015 | spin_unlock_irq(&blkcg->lock); | |
34d0f179 | 1016 | } |
062a644d VG |
1017 | } |
1018 | ||
1019 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, | |
1020 | struct seq_file *m) | |
1021 | { | |
1022 | struct blkio_cgroup *blkcg; | |
1023 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1024 | int name = BLKIOFILE_ATTR(cft->private); | |
1025 | ||
1026 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1027 | ||
1028 | switch(plid) { | |
1029 | case BLKIO_POLICY_PROP: | |
1030 | switch(name) { | |
1031 | case BLKIO_PROP_weight_device: | |
1032 | blkio_read_policy_node_files(cft, blkcg, m); | |
1033 | return 0; | |
1034 | default: | |
1035 | BUG(); | |
1036 | } | |
1037 | break; | |
4c9eefa1 VG |
1038 | case BLKIO_POLICY_THROTL: |
1039 | switch(name){ | |
1040 | case BLKIO_THROTL_read_bps_device: | |
1041 | case BLKIO_THROTL_write_bps_device: | |
7702e8f4 VG |
1042 | case BLKIO_THROTL_read_iops_device: |
1043 | case BLKIO_THROTL_write_iops_device: | |
4c9eefa1 VG |
1044 | blkio_read_policy_node_files(cft, blkcg, m); |
1045 | return 0; | |
1046 | default: | |
1047 | BUG(); | |
1048 | } | |
1049 | break; | |
062a644d VG |
1050 | default: |
1051 | BUG(); | |
1052 | } | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, | |
1058 | struct cftype *cft, struct cgroup_map_cb *cb, enum stat_type type, | |
1059 | bool show_total) | |
1060 | { | |
1061 | struct blkio_group *blkg; | |
1062 | struct hlist_node *n; | |
1063 | uint64_t cgroup_total = 0; | |
1064 | ||
1065 | rcu_read_lock(); | |
1066 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
1067 | if (blkg->dev) { | |
1068 | if (!cftype_blkg_same_policy(cft, blkg)) | |
1069 | continue; | |
1070 | spin_lock_irq(&blkg->stats_lock); | |
1071 | cgroup_total += blkio_get_stat(blkg, cb, blkg->dev, | |
1072 | type); | |
1073 | spin_unlock_irq(&blkg->stats_lock); | |
1074 | } | |
1075 | } | |
1076 | if (show_total) | |
1077 | cb->fill(cb, "Total", cgroup_total); | |
1078 | rcu_read_unlock(); | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | /* All map kind of cgroup file get serviced by this function */ | |
1083 | static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, | |
1084 | struct cgroup_map_cb *cb) | |
1085 | { | |
1086 | struct blkio_cgroup *blkcg; | |
1087 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1088 | int name = BLKIOFILE_ATTR(cft->private); | |
1089 | ||
1090 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1091 | ||
1092 | switch(plid) { | |
1093 | case BLKIO_POLICY_PROP: | |
1094 | switch(name) { | |
1095 | case BLKIO_PROP_time: | |
1096 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1097 | BLKIO_STAT_TIME, 0); | |
1098 | case BLKIO_PROP_sectors: | |
1099 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1100 | BLKIO_STAT_SECTORS, 0); | |
1101 | case BLKIO_PROP_io_service_bytes: | |
1102 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1103 | BLKIO_STAT_SERVICE_BYTES, 1); | |
1104 | case BLKIO_PROP_io_serviced: | |
1105 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1106 | BLKIO_STAT_SERVICED, 1); | |
1107 | case BLKIO_PROP_io_service_time: | |
1108 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1109 | BLKIO_STAT_SERVICE_TIME, 1); | |
1110 | case BLKIO_PROP_io_wait_time: | |
1111 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1112 | BLKIO_STAT_WAIT_TIME, 1); | |
1113 | case BLKIO_PROP_io_merged: | |
1114 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1115 | BLKIO_STAT_MERGED, 1); | |
1116 | case BLKIO_PROP_io_queued: | |
1117 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1118 | BLKIO_STAT_QUEUED, 1); | |
1119 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
1120 | case BLKIO_PROP_dequeue: | |
1121 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1122 | BLKIO_STAT_DEQUEUE, 0); | |
1123 | case BLKIO_PROP_avg_queue_size: | |
1124 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1125 | BLKIO_STAT_AVG_QUEUE_SIZE, 0); | |
1126 | case BLKIO_PROP_group_wait_time: | |
1127 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1128 | BLKIO_STAT_GROUP_WAIT_TIME, 0); | |
1129 | case BLKIO_PROP_idle_time: | |
1130 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1131 | BLKIO_STAT_IDLE_TIME, 0); | |
1132 | case BLKIO_PROP_empty_time: | |
1133 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1134 | BLKIO_STAT_EMPTY_TIME, 0); | |
1135 | #endif | |
1136 | default: | |
1137 | BUG(); | |
1138 | } | |
1139 | break; | |
4c9eefa1 VG |
1140 | case BLKIO_POLICY_THROTL: |
1141 | switch(name){ | |
1142 | case BLKIO_THROTL_io_service_bytes: | |
1143 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1144 | BLKIO_STAT_SERVICE_BYTES, 1); | |
1145 | case BLKIO_THROTL_io_serviced: | |
1146 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
1147 | BLKIO_STAT_SERVICED, 1); | |
1148 | default: | |
1149 | BUG(); | |
1150 | } | |
1151 | break; | |
062a644d VG |
1152 | default: |
1153 | BUG(); | |
1154 | } | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) | |
1160 | { | |
1161 | struct blkio_group *blkg; | |
1162 | struct hlist_node *n; | |
1163 | struct blkio_policy_node *pn; | |
1164 | ||
1165 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) | |
1166 | return -EINVAL; | |
1167 | ||
1168 | spin_lock(&blkio_list_lock); | |
1169 | spin_lock_irq(&blkcg->lock); | |
1170 | blkcg->weight = (unsigned int)val; | |
1171 | ||
1172 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
1173 | pn = blkio_policy_search_node(blkcg, blkg->dev, | |
1174 | BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); | |
1175 | if (pn) | |
1176 | continue; | |
1177 | ||
1178 | blkio_update_group_weight(blkg, blkcg->weight); | |
1179 | } | |
1180 | spin_unlock_irq(&blkcg->lock); | |
1181 | spin_unlock(&blkio_list_lock); | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { | |
1186 | struct blkio_cgroup *blkcg; | |
1187 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1188 | int name = BLKIOFILE_ATTR(cft->private); | |
1189 | ||
1190 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1191 | ||
1192 | switch(plid) { | |
1193 | case BLKIO_POLICY_PROP: | |
1194 | switch(name) { | |
1195 | case BLKIO_PROP_weight: | |
1196 | return (u64)blkcg->weight; | |
1197 | } | |
1198 | break; | |
1199 | default: | |
1200 | BUG(); | |
1201 | } | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static int | |
1206 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) | |
1207 | { | |
1208 | struct blkio_cgroup *blkcg; | |
1209 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1210 | int name = BLKIOFILE_ATTR(cft->private); | |
1211 | ||
1212 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1213 | ||
1214 | switch(plid) { | |
1215 | case BLKIO_POLICY_PROP: | |
1216 | switch(name) { | |
1217 | case BLKIO_PROP_weight: | |
1218 | return blkio_weight_write(blkcg, val); | |
1219 | } | |
1220 | break; | |
1221 | default: | |
1222 | BUG(); | |
1223 | } | |
34d0f179 | 1224 | |
34d0f179 GJ |
1225 | return 0; |
1226 | } | |
1227 | ||
31e4c28d | 1228 | struct cftype blkio_files[] = { |
34d0f179 GJ |
1229 | { |
1230 | .name = "weight_device", | |
062a644d VG |
1231 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1232 | BLKIO_PROP_weight_device), | |
1233 | .read_seq_string = blkiocg_file_read, | |
1234 | .write_string = blkiocg_file_write, | |
34d0f179 GJ |
1235 | .max_write_len = 256, |
1236 | }, | |
31e4c28d VG |
1237 | { |
1238 | .name = "weight", | |
062a644d VG |
1239 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1240 | BLKIO_PROP_weight), | |
1241 | .read_u64 = blkiocg_file_read_u64, | |
1242 | .write_u64 = blkiocg_file_write_u64, | |
31e4c28d | 1243 | }, |
22084190 VG |
1244 | { |
1245 | .name = "time", | |
062a644d VG |
1246 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1247 | BLKIO_PROP_time), | |
1248 | .read_map = blkiocg_file_read_map, | |
22084190 VG |
1249 | }, |
1250 | { | |
1251 | .name = "sectors", | |
062a644d VG |
1252 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1253 | BLKIO_PROP_sectors), | |
1254 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1255 | }, |
1256 | { | |
1257 | .name = "io_service_bytes", | |
062a644d VG |
1258 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1259 | BLKIO_PROP_io_service_bytes), | |
1260 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1261 | }, |
1262 | { | |
1263 | .name = "io_serviced", | |
062a644d VG |
1264 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1265 | BLKIO_PROP_io_serviced), | |
1266 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1267 | }, |
1268 | { | |
1269 | .name = "io_service_time", | |
062a644d VG |
1270 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1271 | BLKIO_PROP_io_service_time), | |
1272 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1273 | }, |
1274 | { | |
1275 | .name = "io_wait_time", | |
062a644d VG |
1276 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1277 | BLKIO_PROP_io_wait_time), | |
1278 | .read_map = blkiocg_file_read_map, | |
84c124da | 1279 | }, |
812d4026 DS |
1280 | { |
1281 | .name = "io_merged", | |
062a644d VG |
1282 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1283 | BLKIO_PROP_io_merged), | |
1284 | .read_map = blkiocg_file_read_map, | |
812d4026 | 1285 | }, |
cdc1184c DS |
1286 | { |
1287 | .name = "io_queued", | |
062a644d VG |
1288 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1289 | BLKIO_PROP_io_queued), | |
1290 | .read_map = blkiocg_file_read_map, | |
cdc1184c | 1291 | }, |
84c124da DS |
1292 | { |
1293 | .name = "reset_stats", | |
1294 | .write_u64 = blkiocg_reset_stats, | |
22084190 | 1295 | }, |
13f98250 VG |
1296 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1297 | { | |
1298 | .name = "throttle.read_bps_device", | |
1299 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1300 | BLKIO_THROTL_read_bps_device), | |
1301 | .read_seq_string = blkiocg_file_read, | |
1302 | .write_string = blkiocg_file_write, | |
1303 | .max_write_len = 256, | |
1304 | }, | |
1305 | ||
1306 | { | |
1307 | .name = "throttle.write_bps_device", | |
1308 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1309 | BLKIO_THROTL_write_bps_device), | |
1310 | .read_seq_string = blkiocg_file_read, | |
1311 | .write_string = blkiocg_file_write, | |
1312 | .max_write_len = 256, | |
1313 | }, | |
1314 | ||
1315 | { | |
1316 | .name = "throttle.read_iops_device", | |
1317 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1318 | BLKIO_THROTL_read_iops_device), | |
1319 | .read_seq_string = blkiocg_file_read, | |
1320 | .write_string = blkiocg_file_write, | |
1321 | .max_write_len = 256, | |
1322 | }, | |
1323 | ||
1324 | { | |
1325 | .name = "throttle.write_iops_device", | |
1326 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1327 | BLKIO_THROTL_write_iops_device), | |
1328 | .read_seq_string = blkiocg_file_read, | |
1329 | .write_string = blkiocg_file_write, | |
1330 | .max_write_len = 256, | |
1331 | }, | |
1332 | { | |
1333 | .name = "throttle.io_service_bytes", | |
1334 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1335 | BLKIO_THROTL_io_service_bytes), | |
1336 | .read_map = blkiocg_file_read_map, | |
1337 | }, | |
1338 | { | |
1339 | .name = "throttle.io_serviced", | |
1340 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1341 | BLKIO_THROTL_io_serviced), | |
1342 | .read_map = blkiocg_file_read_map, | |
1343 | }, | |
1344 | #endif /* CONFIG_BLK_DEV_THROTTLING */ | |
1345 | ||
22084190 | 1346 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
cdc1184c DS |
1347 | { |
1348 | .name = "avg_queue_size", | |
062a644d VG |
1349 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1350 | BLKIO_PROP_avg_queue_size), | |
1351 | .read_map = blkiocg_file_read_map, | |
cdc1184c | 1352 | }, |
812df48d DS |
1353 | { |
1354 | .name = "group_wait_time", | |
062a644d VG |
1355 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1356 | BLKIO_PROP_group_wait_time), | |
1357 | .read_map = blkiocg_file_read_map, | |
812df48d DS |
1358 | }, |
1359 | { | |
1360 | .name = "idle_time", | |
062a644d VG |
1361 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1362 | BLKIO_PROP_idle_time), | |
1363 | .read_map = blkiocg_file_read_map, | |
812df48d DS |
1364 | }, |
1365 | { | |
1366 | .name = "empty_time", | |
062a644d VG |
1367 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1368 | BLKIO_PROP_empty_time), | |
1369 | .read_map = blkiocg_file_read_map, | |
812df48d | 1370 | }, |
cdc1184c | 1371 | { |
22084190 | 1372 | .name = "dequeue", |
062a644d VG |
1373 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1374 | BLKIO_PROP_dequeue), | |
1375 | .read_map = blkiocg_file_read_map, | |
cdc1184c | 1376 | }, |
22084190 | 1377 | #endif |
31e4c28d VG |
1378 | }; |
1379 | ||
1380 | static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) | |
1381 | { | |
1382 | return cgroup_add_files(cgroup, subsys, blkio_files, | |
1383 | ARRAY_SIZE(blkio_files)); | |
1384 | } | |
1385 | ||
1386 | static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) | |
1387 | { | |
1388 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); | |
b1c35769 VG |
1389 | unsigned long flags; |
1390 | struct blkio_group *blkg; | |
1391 | void *key; | |
3e252066 | 1392 | struct blkio_policy_type *blkiop; |
34d0f179 | 1393 | struct blkio_policy_node *pn, *pntmp; |
b1c35769 VG |
1394 | |
1395 | rcu_read_lock(); | |
0f3942a3 JA |
1396 | do { |
1397 | spin_lock_irqsave(&blkcg->lock, flags); | |
b1c35769 | 1398 | |
0f3942a3 JA |
1399 | if (hlist_empty(&blkcg->blkg_list)) { |
1400 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
1401 | break; | |
1402 | } | |
b1c35769 | 1403 | |
0f3942a3 JA |
1404 | blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, |
1405 | blkcg_node); | |
1406 | key = rcu_dereference(blkg->key); | |
1407 | __blkiocg_del_blkio_group(blkg); | |
31e4c28d | 1408 | |
0f3942a3 | 1409 | spin_unlock_irqrestore(&blkcg->lock, flags); |
b1c35769 | 1410 | |
0f3942a3 JA |
1411 | /* |
1412 | * This blkio_group is being unlinked as associated cgroup is | |
1413 | * going away. Let all the IO controlling policies know about | |
1414 | * this event. Currently this is static call to one io | |
1415 | * controlling policy. Once we have more policies in place, we | |
1416 | * need some dynamic registration of callback function. | |
1417 | */ | |
1418 | spin_lock(&blkio_list_lock); | |
1419 | list_for_each_entry(blkiop, &blkio_list, list) | |
1420 | blkiop->ops.blkio_unlink_group_fn(key, blkg); | |
1421 | spin_unlock(&blkio_list_lock); | |
1422 | } while (1); | |
34d0f179 | 1423 | |
34d0f179 GJ |
1424 | list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { |
1425 | blkio_policy_delete_node(pn); | |
1426 | kfree(pn); | |
1427 | } | |
0f3942a3 | 1428 | |
31e4c28d | 1429 | free_css_id(&blkio_subsys, &blkcg->css); |
b1c35769 | 1430 | rcu_read_unlock(); |
67523c48 BB |
1431 | if (blkcg != &blkio_root_cgroup) |
1432 | kfree(blkcg); | |
31e4c28d VG |
1433 | } |
1434 | ||
1435 | static struct cgroup_subsys_state * | |
1436 | blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) | |
1437 | { | |
0341509f LZ |
1438 | struct blkio_cgroup *blkcg; |
1439 | struct cgroup *parent = cgroup->parent; | |
31e4c28d | 1440 | |
0341509f | 1441 | if (!parent) { |
31e4c28d VG |
1442 | blkcg = &blkio_root_cgroup; |
1443 | goto done; | |
1444 | } | |
1445 | ||
1446 | /* Currently we do not support hierarchy deeper than two level (0,1) */ | |
0341509f | 1447 | if (parent != cgroup->top_cgroup) |
31e4c28d VG |
1448 | return ERR_PTR(-EINVAL); |
1449 | ||
1450 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); | |
1451 | if (!blkcg) | |
1452 | return ERR_PTR(-ENOMEM); | |
1453 | ||
1454 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; | |
1455 | done: | |
1456 | spin_lock_init(&blkcg->lock); | |
1457 | INIT_HLIST_HEAD(&blkcg->blkg_list); | |
1458 | ||
34d0f179 | 1459 | INIT_LIST_HEAD(&blkcg->policy_list); |
31e4c28d VG |
1460 | return &blkcg->css; |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * We cannot support shared io contexts, as we have no mean to support | |
1465 | * two tasks with the same ioc in two different groups without major rework | |
1466 | * of the main cic data structures. For now we allow a task to change | |
1467 | * its cgroup only if it's the only owner of its ioc. | |
1468 | */ | |
1469 | static int blkiocg_can_attach(struct cgroup_subsys *subsys, | |
1470 | struct cgroup *cgroup, struct task_struct *tsk, | |
1471 | bool threadgroup) | |
1472 | { | |
1473 | struct io_context *ioc; | |
1474 | int ret = 0; | |
1475 | ||
1476 | /* task_lock() is needed to avoid races with exit_io_context() */ | |
1477 | task_lock(tsk); | |
1478 | ioc = tsk->io_context; | |
1479 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) | |
1480 | ret = -EINVAL; | |
1481 | task_unlock(tsk); | |
1482 | ||
1483 | return ret; | |
1484 | } | |
1485 | ||
1486 | static void blkiocg_attach(struct cgroup_subsys *subsys, struct cgroup *cgroup, | |
1487 | struct cgroup *prev, struct task_struct *tsk, | |
1488 | bool threadgroup) | |
1489 | { | |
1490 | struct io_context *ioc; | |
1491 | ||
1492 | task_lock(tsk); | |
1493 | ioc = tsk->io_context; | |
1494 | if (ioc) | |
1495 | ioc->cgroup_changed = 1; | |
1496 | task_unlock(tsk); | |
1497 | } | |
1498 | ||
3e252066 VG |
1499 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
1500 | { | |
1501 | spin_lock(&blkio_list_lock); | |
1502 | list_add_tail(&blkiop->list, &blkio_list); | |
1503 | spin_unlock(&blkio_list_lock); | |
1504 | } | |
1505 | EXPORT_SYMBOL_GPL(blkio_policy_register); | |
1506 | ||
1507 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) | |
1508 | { | |
1509 | spin_lock(&blkio_list_lock); | |
1510 | list_del_init(&blkiop->list); | |
1511 | spin_unlock(&blkio_list_lock); | |
1512 | } | |
1513 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); | |
67523c48 BB |
1514 | |
1515 | static int __init init_cgroup_blkio(void) | |
1516 | { | |
1517 | return cgroup_load_subsys(&blkio_subsys); | |
1518 | } | |
1519 | ||
1520 | static void __exit exit_cgroup_blkio(void) | |
1521 | { | |
1522 | cgroup_unload_subsys(&blkio_subsys); | |
1523 | } | |
1524 | ||
1525 | module_init(init_cgroup_blkio); | |
1526 | module_exit(exit_cgroup_blkio); | |
1527 | MODULE_LICENSE("GPL"); |