Commit | Line | Data |
---|---|---|
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 | ||
062a644d VG |
31 | /* for encoding cft->private value on file */ |
32 | #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) | |
33 | /* What policy owns the file, proportional or throttle */ | |
34 | #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) | |
35 | #define BLKIOFILE_ATTR(val) ((val) & 0xffff) | |
36 | ||
34d0f179 GJ |
37 | static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg, |
38 | struct blkio_policy_node *pn) | |
39 | { | |
40 | list_add(&pn->node, &blkcg->policy_list); | |
41 | } | |
42 | ||
062a644d VG |
43 | static inline bool cftype_blkg_same_policy(struct cftype *cft, |
44 | struct blkio_group *blkg) | |
45 | { | |
46 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
47 | ||
48 | if (blkg->plid == plid) | |
49 | return 1; | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | /* Determines if policy node matches cgroup file being accessed */ | |
55 | static inline bool pn_matches_cftype(struct cftype *cft, | |
56 | struct blkio_policy_node *pn) | |
57 | { | |
58 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
59 | int fileid = BLKIOFILE_ATTR(cft->private); | |
60 | ||
61 | return (plid == pn->plid && fileid == pn->fileid); | |
62 | } | |
63 | ||
34d0f179 GJ |
64 | /* Must be called with blkcg->lock held */ |
65 | static inline void blkio_policy_delete_node(struct blkio_policy_node *pn) | |
66 | { | |
67 | list_del(&pn->node); | |
68 | } | |
69 | ||
70 | /* Must be called with blkcg->lock held */ | |
71 | static struct blkio_policy_node * | |
062a644d VG |
72 | blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev, |
73 | enum blkio_policy_id plid, int fileid) | |
34d0f179 GJ |
74 | { |
75 | struct blkio_policy_node *pn; | |
76 | ||
77 | list_for_each_entry(pn, &blkcg->policy_list, node) { | |
062a644d | 78 | if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid) |
34d0f179 GJ |
79 | return pn; |
80 | } | |
81 | ||
82 | return NULL; | |
83 | } | |
84 | ||
31e4c28d VG |
85 | struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) |
86 | { | |
87 | return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), | |
88 | struct blkio_cgroup, css); | |
89 | } | |
9d6a986c | 90 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
31e4c28d | 91 | |
70087dc3 VG |
92 | struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) |
93 | { | |
94 | return container_of(task_subsys_state(tsk, blkio_subsys_id), | |
95 | struct blkio_cgroup, css); | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(task_blkio_cgroup); | |
98 | ||
062a644d VG |
99 | static inline void |
100 | blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) | |
101 | { | |
102 | struct blkio_policy_type *blkiop; | |
103 | ||
104 | list_for_each_entry(blkiop, &blkio_list, list) { | |
105 | /* If this policy does not own the blkg, do not send updates */ | |
106 | if (blkiop->plid != blkg->plid) | |
107 | continue; | |
108 | if (blkiop->ops.blkio_update_group_weight_fn) | |
fe071437 VG |
109 | blkiop->ops.blkio_update_group_weight_fn(blkg->key, |
110 | blkg, weight); | |
062a644d VG |
111 | } |
112 | } | |
113 | ||
4c9eefa1 VG |
114 | static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, |
115 | int fileid) | |
116 | { | |
117 | struct blkio_policy_type *blkiop; | |
118 | ||
119 | list_for_each_entry(blkiop, &blkio_list, list) { | |
120 | ||
121 | /* If this policy does not own the blkg, do not send updates */ | |
122 | if (blkiop->plid != blkg->plid) | |
123 | continue; | |
124 | ||
125 | if (fileid == BLKIO_THROTL_read_bps_device | |
126 | && blkiop->ops.blkio_update_group_read_bps_fn) | |
fe071437 VG |
127 | blkiop->ops.blkio_update_group_read_bps_fn(blkg->key, |
128 | blkg, bps); | |
4c9eefa1 VG |
129 | |
130 | if (fileid == BLKIO_THROTL_write_bps_device | |
131 | && blkiop->ops.blkio_update_group_write_bps_fn) | |
fe071437 VG |
132 | blkiop->ops.blkio_update_group_write_bps_fn(blkg->key, |
133 | blkg, bps); | |
4c9eefa1 VG |
134 | } |
135 | } | |
136 | ||
7702e8f4 VG |
137 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
138 | unsigned int iops, int fileid) | |
139 | { | |
140 | struct blkio_policy_type *blkiop; | |
141 | ||
142 | list_for_each_entry(blkiop, &blkio_list, list) { | |
143 | ||
144 | /* If this policy does not own the blkg, do not send updates */ | |
145 | if (blkiop->plid != blkg->plid) | |
146 | continue; | |
147 | ||
148 | if (fileid == BLKIO_THROTL_read_iops_device | |
149 | && blkiop->ops.blkio_update_group_read_iops_fn) | |
fe071437 VG |
150 | blkiop->ops.blkio_update_group_read_iops_fn(blkg->key, |
151 | blkg, iops); | |
7702e8f4 VG |
152 | |
153 | if (fileid == BLKIO_THROTL_write_iops_device | |
154 | && blkiop->ops.blkio_update_group_write_iops_fn) | |
fe071437 VG |
155 | blkiop->ops.blkio_update_group_write_iops_fn(blkg->key, |
156 | blkg,iops); | |
7702e8f4 VG |
157 | } |
158 | } | |
159 | ||
9195291e DS |
160 | /* |
161 | * Add to the appropriate stat variable depending on the request type. | |
162 | * This should be called with the blkg->stats_lock held. | |
163 | */ | |
84c124da DS |
164 | static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, |
165 | bool sync) | |
9195291e | 166 | { |
84c124da DS |
167 | if (direction) |
168 | stat[BLKIO_STAT_WRITE] += add; | |
9195291e | 169 | else |
84c124da DS |
170 | stat[BLKIO_STAT_READ] += add; |
171 | if (sync) | |
172 | stat[BLKIO_STAT_SYNC] += add; | |
9195291e | 173 | else |
84c124da | 174 | stat[BLKIO_STAT_ASYNC] += add; |
9195291e DS |
175 | } |
176 | ||
cdc1184c DS |
177 | /* |
178 | * Decrements the appropriate stat variable if non-zero depending on the | |
179 | * request type. Panics on value being zero. | |
180 | * This should be called with the blkg->stats_lock held. | |
181 | */ | |
182 | static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) | |
183 | { | |
184 | if (direction) { | |
185 | BUG_ON(stat[BLKIO_STAT_WRITE] == 0); | |
186 | stat[BLKIO_STAT_WRITE]--; | |
187 | } else { | |
188 | BUG_ON(stat[BLKIO_STAT_READ] == 0); | |
189 | stat[BLKIO_STAT_READ]--; | |
190 | } | |
191 | if (sync) { | |
192 | BUG_ON(stat[BLKIO_STAT_SYNC] == 0); | |
193 | stat[BLKIO_STAT_SYNC]--; | |
194 | } else { | |
195 | BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); | |
196 | stat[BLKIO_STAT_ASYNC]--; | |
197 | } | |
198 | } | |
199 | ||
200 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
812df48d DS |
201 | /* This should be called with the blkg->stats_lock held. */ |
202 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, | |
203 | struct blkio_group *curr_blkg) | |
204 | { | |
205 | if (blkio_blkg_waiting(&blkg->stats)) | |
206 | return; | |
207 | if (blkg == curr_blkg) | |
208 | return; | |
209 | blkg->stats.start_group_wait_time = sched_clock(); | |
210 | blkio_mark_blkg_waiting(&blkg->stats); | |
211 | } | |
212 | ||
213 | /* This should be called with the blkg->stats_lock held. */ | |
214 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) | |
215 | { | |
216 | unsigned long long now; | |
217 | ||
218 | if (!blkio_blkg_waiting(stats)) | |
219 | return; | |
220 | ||
221 | now = sched_clock(); | |
222 | if (time_after64(now, stats->start_group_wait_time)) | |
223 | stats->group_wait_time += now - stats->start_group_wait_time; | |
224 | blkio_clear_blkg_waiting(stats); | |
225 | } | |
226 | ||
227 | /* This should be called with the blkg->stats_lock held. */ | |
228 | static void blkio_end_empty_time(struct blkio_group_stats *stats) | |
229 | { | |
230 | unsigned long long now; | |
231 | ||
232 | if (!blkio_blkg_empty(stats)) | |
233 | return; | |
234 | ||
235 | now = sched_clock(); | |
236 | if (time_after64(now, stats->start_empty_time)) | |
237 | stats->empty_time += now - stats->start_empty_time; | |
238 | blkio_clear_blkg_empty(stats); | |
239 | } | |
240 | ||
241 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) | |
242 | { | |
243 | unsigned long flags; | |
244 | ||
245 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
246 | BUG_ON(blkio_blkg_idling(&blkg->stats)); | |
247 | blkg->stats.start_idle_time = sched_clock(); | |
248 | blkio_mark_blkg_idling(&blkg->stats); | |
249 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); | |
252 | ||
253 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg) | |
254 | { | |
255 | unsigned long flags; | |
256 | unsigned long long now; | |
257 | struct blkio_group_stats *stats; | |
258 | ||
259 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
260 | stats = &blkg->stats; | |
261 | if (blkio_blkg_idling(stats)) { | |
262 | now = sched_clock(); | |
263 | if (time_after64(now, stats->start_idle_time)) | |
264 | stats->idle_time += now - stats->start_idle_time; | |
265 | blkio_clear_blkg_idling(stats); | |
266 | } | |
267 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); | |
270 | ||
a11cdaa7 | 271 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
cdc1184c DS |
272 | { |
273 | unsigned long flags; | |
274 | struct blkio_group_stats *stats; | |
275 | ||
276 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
277 | stats = &blkg->stats; | |
278 | stats->avg_queue_size_sum += | |
279 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + | |
280 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; | |
281 | stats->avg_queue_size_samples++; | |
812df48d | 282 | blkio_update_group_wait_time(stats); |
cdc1184c DS |
283 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
284 | } | |
a11cdaa7 DS |
285 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
286 | ||
e5ff082e | 287 | void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
28baf442 DS |
288 | { |
289 | unsigned long flags; | |
290 | struct blkio_group_stats *stats; | |
291 | ||
292 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
293 | stats = &blkg->stats; | |
294 | ||
295 | if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || | |
296 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { | |
297 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
298 | return; | |
299 | } | |
300 | ||
301 | /* | |
e5ff082e VG |
302 | * group is already marked empty. This can happen if cfqq got new |
303 | * request in parent group and moved to this group while being added | |
304 | * to service tree. Just ignore the event and move on. | |
28baf442 | 305 | */ |
e5ff082e VG |
306 | if(blkio_blkg_empty(stats)) { |
307 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
308 | return; | |
309 | } | |
310 | ||
28baf442 DS |
311 | stats->start_empty_time = sched_clock(); |
312 | blkio_mark_blkg_empty(stats); | |
313 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
314 | } | |
315 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); | |
316 | ||
a11cdaa7 DS |
317 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
318 | unsigned long dequeue) | |
319 | { | |
320 | blkg->stats.dequeue += dequeue; | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); | |
812df48d DS |
323 | #else |
324 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, | |
325 | struct blkio_group *curr_blkg) {} | |
326 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} | |
cdc1184c DS |
327 | #endif |
328 | ||
a11cdaa7 | 329 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
cdc1184c DS |
330 | struct blkio_group *curr_blkg, bool direction, |
331 | bool sync) | |
332 | { | |
333 | unsigned long flags; | |
334 | ||
335 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
336 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, | |
337 | sync); | |
812df48d DS |
338 | blkio_end_empty_time(&blkg->stats); |
339 | blkio_set_start_group_wait_time(blkg, curr_blkg); | |
cdc1184c DS |
340 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
341 | } | |
a11cdaa7 | 342 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
cdc1184c | 343 | |
a11cdaa7 | 344 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
cdc1184c DS |
345 | bool direction, bool sync) |
346 | { | |
347 | unsigned long flags; | |
348 | ||
349 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
350 | blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], | |
351 | direction, sync); | |
352 | spin_unlock_irqrestore(&blkg->stats_lock, flags); | |
353 | } | |
a11cdaa7 | 354 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
cdc1184c | 355 | |
167400d3 JT |
356 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time, |
357 | unsigned long unaccounted_time) | |
22084190 | 358 | { |
303a3acb DS |
359 | unsigned long flags; |
360 | ||
361 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
362 | blkg->stats.time += time; | |
a23e6869 | 363 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
167400d3 | 364 | blkg->stats.unaccounted_time += unaccounted_time; |
a23e6869 | 365 | #endif |
303a3acb | 366 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
22084190 | 367 | } |
303a3acb | 368 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
22084190 | 369 | |
5624a4e4 VG |
370 | /* |
371 | * should be called under rcu read lock or queue lock to make sure blkg pointer | |
372 | * is valid. | |
373 | */ | |
84c124da DS |
374 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
375 | uint64_t bytes, bool direction, bool sync) | |
9195291e | 376 | { |
5624a4e4 | 377 | struct blkio_group_stats_cpu *stats_cpu; |
575969a0 VG |
378 | unsigned long flags; |
379 | ||
380 | /* | |
381 | * Disabling interrupts to provide mutual exclusion between two | |
382 | * writes on same cpu. It probably is not needed for 64bit. Not | |
383 | * optimizing that case yet. | |
384 | */ | |
385 | local_irq_save(flags); | |
9195291e | 386 | |
5624a4e4 VG |
387 | stats_cpu = this_cpu_ptr(blkg->stats_cpu); |
388 | ||
575969a0 | 389 | u64_stats_update_begin(&stats_cpu->syncp); |
5624a4e4 VG |
390 | stats_cpu->sectors += bytes >> 9; |
391 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICED], | |
392 | 1, direction, sync); | |
393 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICE_BYTES], | |
394 | bytes, direction, sync); | |
575969a0 VG |
395 | u64_stats_update_end(&stats_cpu->syncp); |
396 | local_irq_restore(flags); | |
9195291e | 397 | } |
84c124da | 398 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
9195291e | 399 | |
84c124da DS |
400 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
401 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) | |
9195291e DS |
402 | { |
403 | struct blkio_group_stats *stats; | |
404 | unsigned long flags; | |
405 | unsigned long long now = sched_clock(); | |
406 | ||
407 | spin_lock_irqsave(&blkg->stats_lock, flags); | |
408 | stats = &blkg->stats; | |
84c124da DS |
409 | if (time_after64(now, io_start_time)) |
410 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], | |
411 | now - io_start_time, direction, sync); | |
412 | if (time_after64(io_start_time, start_time)) | |
413 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], | |
414 | io_start_time - start_time, direction, sync); | |
9195291e DS |
415 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
416 | } | |
84c124da | 417 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
9195291e | 418 | |
317389a7 | 419 | /* Merged stats are per cpu. */ |
812d4026 DS |
420 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
421 | bool sync) | |
422 | { | |
317389a7 | 423 | struct blkio_group_stats_cpu *stats_cpu; |
812d4026 DS |
424 | unsigned long flags; |
425 | ||
317389a7 VG |
426 | /* |
427 | * Disabling interrupts to provide mutual exclusion between two | |
428 | * writes on same cpu. It probably is not needed for 64bit. Not | |
429 | * optimizing that case yet. | |
430 | */ | |
431 | local_irq_save(flags); | |
432 | ||
433 | stats_cpu = this_cpu_ptr(blkg->stats_cpu); | |
434 | ||
435 | u64_stats_update_begin(&stats_cpu->syncp); | |
436 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_MERGED], 1, | |
437 | direction, sync); | |
438 | u64_stats_update_end(&stats_cpu->syncp); | |
439 | local_irq_restore(flags); | |
812d4026 DS |
440 | } |
441 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); | |
442 | ||
5624a4e4 VG |
443 | /* |
444 | * This function allocates the per cpu stats for blkio_group. Should be called | |
445 | * from sleepable context as alloc_per_cpu() requires that. | |
446 | */ | |
447 | int blkio_alloc_blkg_stats(struct blkio_group *blkg) | |
448 | { | |
449 | /* Allocate memory for per cpu stats */ | |
450 | blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu); | |
451 | if (!blkg->stats_cpu) | |
452 | return -ENOMEM; | |
453 | return 0; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(blkio_alloc_blkg_stats); | |
456 | ||
31e4c28d | 457 | void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
062a644d VG |
458 | struct blkio_group *blkg, void *key, dev_t dev, |
459 | enum blkio_policy_id plid) | |
31e4c28d VG |
460 | { |
461 | unsigned long flags; | |
462 | ||
463 | spin_lock_irqsave(&blkcg->lock, flags); | |
8d2a91f8 | 464 | spin_lock_init(&blkg->stats_lock); |
31e4c28d | 465 | rcu_assign_pointer(blkg->key, key); |
b1c35769 | 466 | blkg->blkcg_id = css_id(&blkcg->css); |
31e4c28d | 467 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
062a644d | 468 | blkg->plid = plid; |
31e4c28d | 469 | spin_unlock_irqrestore(&blkcg->lock, flags); |
2868ef7b VG |
470 | /* Need to take css reference ? */ |
471 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); | |
22084190 | 472 | blkg->dev = dev; |
31e4c28d | 473 | } |
9d6a986c | 474 | EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); |
31e4c28d | 475 | |
b1c35769 VG |
476 | static void __blkiocg_del_blkio_group(struct blkio_group *blkg) |
477 | { | |
478 | hlist_del_init_rcu(&blkg->blkcg_node); | |
479 | blkg->blkcg_id = 0; | |
480 | } | |
481 | ||
482 | /* | |
483 | * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 | |
484 | * indicating that blk_group was unhashed by the time we got to it. | |
485 | */ | |
31e4c28d VG |
486 | int blkiocg_del_blkio_group(struct blkio_group *blkg) |
487 | { | |
b1c35769 VG |
488 | struct blkio_cgroup *blkcg; |
489 | unsigned long flags; | |
490 | struct cgroup_subsys_state *css; | |
491 | int ret = 1; | |
492 | ||
493 | rcu_read_lock(); | |
494 | css = css_lookup(&blkio_subsys, blkg->blkcg_id); | |
0f3942a3 JA |
495 | if (css) { |
496 | blkcg = container_of(css, struct blkio_cgroup, css); | |
497 | spin_lock_irqsave(&blkcg->lock, flags); | |
498 | if (!hlist_unhashed(&blkg->blkcg_node)) { | |
499 | __blkiocg_del_blkio_group(blkg); | |
500 | ret = 0; | |
501 | } | |
502 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
b1c35769 | 503 | } |
0f3942a3 | 504 | |
b1c35769 VG |
505 | rcu_read_unlock(); |
506 | return ret; | |
31e4c28d | 507 | } |
9d6a986c | 508 | EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
31e4c28d VG |
509 | |
510 | /* called under rcu_read_lock(). */ | |
511 | struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) | |
512 | { | |
513 | struct blkio_group *blkg; | |
514 | struct hlist_node *n; | |
515 | void *__key; | |
516 | ||
517 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
518 | __key = blkg->key; | |
519 | if (__key == key) | |
520 | return blkg; | |
521 | } | |
522 | ||
523 | return NULL; | |
524 | } | |
9d6a986c | 525 | EXPORT_SYMBOL_GPL(blkiocg_lookup_group); |
31e4c28d | 526 | |
f0bdc8cd VG |
527 | static void blkio_reset_stats_cpu(struct blkio_group *blkg) |
528 | { | |
529 | struct blkio_group_stats_cpu *stats_cpu; | |
530 | int i, j, k; | |
531 | /* | |
532 | * Note: On 64 bit arch this should not be an issue. This has the | |
533 | * possibility of returning some inconsistent value on 32bit arch | |
534 | * as 64bit update on 32bit is non atomic. Taking care of this | |
535 | * corner case makes code very complicated, like sending IPIs to | |
536 | * cpus, taking care of stats of offline cpus etc. | |
537 | * | |
538 | * reset stats is anyway more of a debug feature and this sounds a | |
539 | * corner case. So I am not complicating the code yet until and | |
540 | * unless this becomes a real issue. | |
541 | */ | |
542 | for_each_possible_cpu(i) { | |
543 | stats_cpu = per_cpu_ptr(blkg->stats_cpu, i); | |
544 | stats_cpu->sectors = 0; | |
545 | for(j = 0; j < BLKIO_STAT_CPU_NR; j++) | |
546 | for (k = 0; k < BLKIO_STAT_TOTAL; k++) | |
547 | stats_cpu->stat_arr_cpu[j][k] = 0; | |
548 | } | |
549 | } | |
550 | ||
303a3acb | 551 | static int |
84c124da | 552 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
303a3acb DS |
553 | { |
554 | struct blkio_cgroup *blkcg; | |
555 | struct blkio_group *blkg; | |
812df48d | 556 | struct blkio_group_stats *stats; |
303a3acb | 557 | struct hlist_node *n; |
cdc1184c DS |
558 | uint64_t queued[BLKIO_STAT_TOTAL]; |
559 | int i; | |
812df48d DS |
560 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
561 | bool idling, waiting, empty; | |
562 | unsigned long long now = sched_clock(); | |
563 | #endif | |
303a3acb DS |
564 | |
565 | blkcg = cgroup_to_blkio_cgroup(cgroup); | |
566 | spin_lock_irq(&blkcg->lock); | |
567 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
568 | spin_lock(&blkg->stats_lock); | |
812df48d DS |
569 | stats = &blkg->stats; |
570 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
571 | idling = blkio_blkg_idling(stats); | |
572 | waiting = blkio_blkg_waiting(stats); | |
573 | empty = blkio_blkg_empty(stats); | |
574 | #endif | |
cdc1184c | 575 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
812df48d DS |
576 | queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; |
577 | memset(stats, 0, sizeof(struct blkio_group_stats)); | |
cdc1184c | 578 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
812df48d DS |
579 | stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; |
580 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
581 | if (idling) { | |
582 | blkio_mark_blkg_idling(stats); | |
583 | stats->start_idle_time = now; | |
584 | } | |
585 | if (waiting) { | |
586 | blkio_mark_blkg_waiting(stats); | |
587 | stats->start_group_wait_time = now; | |
588 | } | |
589 | if (empty) { | |
590 | blkio_mark_blkg_empty(stats); | |
591 | stats->start_empty_time = now; | |
592 | } | |
593 | #endif | |
303a3acb | 594 | spin_unlock(&blkg->stats_lock); |
f0bdc8cd VG |
595 | |
596 | /* Reset Per cpu stats which don't take blkg->stats_lock */ | |
597 | blkio_reset_stats_cpu(blkg); | |
303a3acb | 598 | } |
f0bdc8cd | 599 | |
303a3acb DS |
600 | spin_unlock_irq(&blkcg->lock); |
601 | return 0; | |
602 | } | |
603 | ||
84c124da DS |
604 | static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str, |
605 | int chars_left, bool diskname_only) | |
303a3acb | 606 | { |
84c124da | 607 | snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev)); |
303a3acb DS |
608 | chars_left -= strlen(str); |
609 | if (chars_left <= 0) { | |
610 | printk(KERN_WARNING | |
611 | "Possibly incorrect cgroup stat display format"); | |
612 | return; | |
613 | } | |
84c124da DS |
614 | if (diskname_only) |
615 | return; | |
303a3acb | 616 | switch (type) { |
84c124da | 617 | case BLKIO_STAT_READ: |
303a3acb DS |
618 | strlcat(str, " Read", chars_left); |
619 | break; | |
84c124da | 620 | case BLKIO_STAT_WRITE: |
303a3acb DS |
621 | strlcat(str, " Write", chars_left); |
622 | break; | |
84c124da | 623 | case BLKIO_STAT_SYNC: |
303a3acb DS |
624 | strlcat(str, " Sync", chars_left); |
625 | break; | |
84c124da | 626 | case BLKIO_STAT_ASYNC: |
303a3acb DS |
627 | strlcat(str, " Async", chars_left); |
628 | break; | |
84c124da | 629 | case BLKIO_STAT_TOTAL: |
303a3acb DS |
630 | strlcat(str, " Total", chars_left); |
631 | break; | |
632 | default: | |
633 | strlcat(str, " Invalid", chars_left); | |
634 | } | |
635 | } | |
636 | ||
84c124da DS |
637 | static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, |
638 | struct cgroup_map_cb *cb, dev_t dev) | |
639 | { | |
640 | blkio_get_key_name(0, dev, str, chars_left, true); | |
641 | cb->fill(cb, str, val); | |
642 | return val; | |
643 | } | |
303a3acb | 644 | |
5624a4e4 VG |
645 | |
646 | static uint64_t blkio_read_stat_cpu(struct blkio_group *blkg, | |
647 | enum stat_type_cpu type, enum stat_sub_type sub_type) | |
648 | { | |
649 | int cpu; | |
650 | struct blkio_group_stats_cpu *stats_cpu; | |
575969a0 | 651 | u64 val = 0, tval; |
5624a4e4 VG |
652 | |
653 | for_each_possible_cpu(cpu) { | |
575969a0 | 654 | unsigned int start; |
5624a4e4 VG |
655 | stats_cpu = per_cpu_ptr(blkg->stats_cpu, cpu); |
656 | ||
575969a0 VG |
657 | do { |
658 | start = u64_stats_fetch_begin(&stats_cpu->syncp); | |
659 | if (type == BLKIO_STAT_CPU_SECTORS) | |
660 | tval = stats_cpu->sectors; | |
661 | else | |
662 | tval = stats_cpu->stat_arr_cpu[type][sub_type]; | |
663 | } while(u64_stats_fetch_retry(&stats_cpu->syncp, start)); | |
664 | ||
665 | val += tval; | |
5624a4e4 VG |
666 | } |
667 | ||
668 | return val; | |
669 | } | |
670 | ||
671 | static uint64_t blkio_get_stat_cpu(struct blkio_group *blkg, | |
672 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type_cpu type) | |
673 | { | |
674 | uint64_t disk_total, val; | |
675 | char key_str[MAX_KEY_LEN]; | |
676 | enum stat_sub_type sub_type; | |
677 | ||
678 | if (type == BLKIO_STAT_CPU_SECTORS) { | |
679 | val = blkio_read_stat_cpu(blkg, type, 0); | |
680 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, val, cb, dev); | |
681 | } | |
682 | ||
683 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; | |
684 | sub_type++) { | |
685 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); | |
686 | val = blkio_read_stat_cpu(blkg, type, sub_type); | |
687 | cb->fill(cb, key_str, val); | |
688 | } | |
689 | ||
690 | disk_total = blkio_read_stat_cpu(blkg, type, BLKIO_STAT_READ) + | |
691 | blkio_read_stat_cpu(blkg, type, BLKIO_STAT_WRITE); | |
692 | ||
693 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); | |
694 | cb->fill(cb, key_str, disk_total); | |
695 | return disk_total; | |
696 | } | |
697 | ||
84c124da DS |
698 | /* This should be called with blkg->stats_lock held */ |
699 | static uint64_t blkio_get_stat(struct blkio_group *blkg, | |
700 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type type) | |
303a3acb DS |
701 | { |
702 | uint64_t disk_total; | |
703 | char key_str[MAX_KEY_LEN]; | |
84c124da DS |
704 | enum stat_sub_type sub_type; |
705 | ||
706 | if (type == BLKIO_STAT_TIME) | |
707 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
708 | blkg->stats.time, cb, dev); | |
9026e521 | 709 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
167400d3 JT |
710 | if (type == BLKIO_STAT_UNACCOUNTED_TIME) |
711 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
712 | blkg->stats.unaccounted_time, cb, dev); | |
cdc1184c DS |
713 | if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { |
714 | uint64_t sum = blkg->stats.avg_queue_size_sum; | |
715 | uint64_t samples = blkg->stats.avg_queue_size_samples; | |
716 | if (samples) | |
717 | do_div(sum, samples); | |
718 | else | |
719 | sum = 0; | |
720 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev); | |
721 | } | |
812df48d DS |
722 | if (type == BLKIO_STAT_GROUP_WAIT_TIME) |
723 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
724 | blkg->stats.group_wait_time, cb, dev); | |
725 | if (type == BLKIO_STAT_IDLE_TIME) | |
726 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
727 | blkg->stats.idle_time, cb, dev); | |
728 | if (type == BLKIO_STAT_EMPTY_TIME) | |
729 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
730 | blkg->stats.empty_time, cb, dev); | |
84c124da DS |
731 | if (type == BLKIO_STAT_DEQUEUE) |
732 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, | |
733 | blkg->stats.dequeue, cb, dev); | |
734 | #endif | |
303a3acb | 735 | |
84c124da DS |
736 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
737 | sub_type++) { | |
738 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); | |
739 | cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); | |
303a3acb | 740 | } |
84c124da DS |
741 | disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + |
742 | blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; | |
743 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); | |
303a3acb DS |
744 | cb->fill(cb, key_str, disk_total); |
745 | return disk_total; | |
746 | } | |
747 | ||
34d0f179 | 748 | static int blkio_policy_parse_and_set(char *buf, |
062a644d | 749 | struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid) |
34d0f179 | 750 | { |
ece84241 | 751 | struct gendisk *disk = NULL; |
34d0f179 | 752 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
d11bb446 | 753 | unsigned long major, minor; |
ece84241 TH |
754 | int i = 0, ret = -EINVAL; |
755 | int part; | |
34d0f179 | 756 | dev_t dev; |
d11bb446 | 757 | u64 temp; |
34d0f179 GJ |
758 | |
759 | memset(s, 0, sizeof(s)); | |
760 | ||
761 | while ((p = strsep(&buf, " ")) != NULL) { | |
762 | if (!*p) | |
763 | continue; | |
764 | ||
765 | s[i++] = p; | |
766 | ||
767 | /* Prevent from inputing too many things */ | |
768 | if (i == 3) | |
769 | break; | |
770 | } | |
771 | ||
772 | if (i != 2) | |
ece84241 | 773 | goto out; |
34d0f179 GJ |
774 | |
775 | p = strsep(&s[0], ":"); | |
776 | if (p != NULL) | |
777 | major_s = p; | |
778 | else | |
ece84241 | 779 | goto out; |
34d0f179 GJ |
780 | |
781 | minor_s = s[0]; | |
782 | if (!minor_s) | |
ece84241 | 783 | goto out; |
34d0f179 | 784 | |
ece84241 TH |
785 | if (strict_strtoul(major_s, 10, &major)) |
786 | goto out; | |
34d0f179 | 787 | |
ece84241 TH |
788 | if (strict_strtoul(minor_s, 10, &minor)) |
789 | goto out; | |
34d0f179 GJ |
790 | |
791 | dev = MKDEV(major, minor); | |
792 | ||
ece84241 TH |
793 | if (strict_strtoull(s[1], 10, &temp)) |
794 | goto out; | |
34d0f179 | 795 | |
d11bb446 WG |
796 | /* For rule removal, do not check for device presence. */ |
797 | if (temp) { | |
ece84241 TH |
798 | disk = get_gendisk(dev, &part); |
799 | if (!disk || part) { | |
800 | ret = -ENODEV; | |
801 | goto out; | |
802 | } | |
d11bb446 | 803 | } |
34d0f179 | 804 | |
d11bb446 | 805 | newpn->dev = dev; |
34d0f179 | 806 | |
062a644d VG |
807 | switch (plid) { |
808 | case BLKIO_POLICY_PROP: | |
d11bb446 WG |
809 | if ((temp < BLKIO_WEIGHT_MIN && temp > 0) || |
810 | temp > BLKIO_WEIGHT_MAX) | |
ece84241 | 811 | goto out; |
34d0f179 | 812 | |
062a644d VG |
813 | newpn->plid = plid; |
814 | newpn->fileid = fileid; | |
4c9eefa1 VG |
815 | newpn->val.weight = temp; |
816 | break; | |
817 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
818 | switch(fileid) { |
819 | case BLKIO_THROTL_read_bps_device: | |
820 | case BLKIO_THROTL_write_bps_device: | |
7702e8f4 VG |
821 | newpn->plid = plid; |
822 | newpn->fileid = fileid; | |
d11bb446 | 823 | newpn->val.bps = temp; |
7702e8f4 VG |
824 | break; |
825 | case BLKIO_THROTL_read_iops_device: | |
826 | case BLKIO_THROTL_write_iops_device: | |
d11bb446 | 827 | if (temp > THROTL_IOPS_MAX) |
ece84241 | 828 | goto out; |
9355aede | 829 | |
7702e8f4 VG |
830 | newpn->plid = plid; |
831 | newpn->fileid = fileid; | |
d11bb446 | 832 | newpn->val.iops = (unsigned int)temp; |
7702e8f4 VG |
833 | break; |
834 | } | |
062a644d VG |
835 | break; |
836 | default: | |
837 | BUG(); | |
838 | } | |
ece84241 TH |
839 | ret = 0; |
840 | out: | |
841 | put_disk(disk); | |
842 | return ret; | |
34d0f179 GJ |
843 | } |
844 | ||
845 | unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, | |
846 | dev_t dev) | |
847 | { | |
848 | struct blkio_policy_node *pn; | |
a38eb630 VG |
849 | unsigned long flags; |
850 | unsigned int weight; | |
851 | ||
852 | spin_lock_irqsave(&blkcg->lock, flags); | |
34d0f179 | 853 | |
062a644d VG |
854 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP, |
855 | BLKIO_PROP_weight_device); | |
34d0f179 | 856 | if (pn) |
a38eb630 | 857 | weight = pn->val.weight; |
34d0f179 | 858 | else |
a38eb630 VG |
859 | weight = blkcg->weight; |
860 | ||
861 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
862 | ||
863 | return weight; | |
34d0f179 GJ |
864 | } |
865 | EXPORT_SYMBOL_GPL(blkcg_get_weight); | |
866 | ||
4c9eefa1 VG |
867 | uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev) |
868 | { | |
869 | struct blkio_policy_node *pn; | |
a38eb630 VG |
870 | unsigned long flags; |
871 | uint64_t bps = -1; | |
4c9eefa1 | 872 | |
a38eb630 | 873 | spin_lock_irqsave(&blkcg->lock, flags); |
4c9eefa1 VG |
874 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
875 | BLKIO_THROTL_read_bps_device); | |
876 | if (pn) | |
a38eb630 VG |
877 | bps = pn->val.bps; |
878 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
879 | ||
880 | return bps; | |
4c9eefa1 VG |
881 | } |
882 | ||
883 | uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev) | |
884 | { | |
885 | struct blkio_policy_node *pn; | |
a38eb630 VG |
886 | unsigned long flags; |
887 | uint64_t bps = -1; | |
888 | ||
889 | spin_lock_irqsave(&blkcg->lock, flags); | |
4c9eefa1 VG |
890 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
891 | BLKIO_THROTL_write_bps_device); | |
892 | if (pn) | |
a38eb630 VG |
893 | bps = pn->val.bps; |
894 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
895 | ||
896 | return bps; | |
4c9eefa1 VG |
897 | } |
898 | ||
7702e8f4 VG |
899 | unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev) |
900 | { | |
901 | struct blkio_policy_node *pn; | |
a38eb630 VG |
902 | unsigned long flags; |
903 | unsigned int iops = -1; | |
7702e8f4 | 904 | |
a38eb630 | 905 | spin_lock_irqsave(&blkcg->lock, flags); |
7702e8f4 VG |
906 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
907 | BLKIO_THROTL_read_iops_device); | |
908 | if (pn) | |
a38eb630 VG |
909 | iops = pn->val.iops; |
910 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
911 | ||
912 | return iops; | |
7702e8f4 VG |
913 | } |
914 | ||
915 | unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev) | |
916 | { | |
917 | struct blkio_policy_node *pn; | |
a38eb630 VG |
918 | unsigned long flags; |
919 | unsigned int iops = -1; | |
920 | ||
921 | spin_lock_irqsave(&blkcg->lock, flags); | |
7702e8f4 VG |
922 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
923 | BLKIO_THROTL_write_iops_device); | |
924 | if (pn) | |
a38eb630 VG |
925 | iops = pn->val.iops; |
926 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
927 | ||
928 | return iops; | |
7702e8f4 VG |
929 | } |
930 | ||
062a644d VG |
931 | /* Checks whether user asked for deleting a policy rule */ |
932 | static bool blkio_delete_rule_command(struct blkio_policy_node *pn) | |
933 | { | |
934 | switch(pn->plid) { | |
935 | case BLKIO_POLICY_PROP: | |
4c9eefa1 VG |
936 | if (pn->val.weight == 0) |
937 | return 1; | |
938 | break; | |
939 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
940 | switch(pn->fileid) { |
941 | case BLKIO_THROTL_read_bps_device: | |
942 | case BLKIO_THROTL_write_bps_device: | |
943 | if (pn->val.bps == 0) | |
944 | return 1; | |
945 | break; | |
946 | case BLKIO_THROTL_read_iops_device: | |
947 | case BLKIO_THROTL_write_iops_device: | |
948 | if (pn->val.iops == 0) | |
949 | return 1; | |
950 | } | |
062a644d VG |
951 | break; |
952 | default: | |
953 | BUG(); | |
954 | } | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, | |
960 | struct blkio_policy_node *newpn) | |
961 | { | |
962 | switch(oldpn->plid) { | |
963 | case BLKIO_POLICY_PROP: | |
4c9eefa1 VG |
964 | oldpn->val.weight = newpn->val.weight; |
965 | break; | |
966 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
967 | switch(newpn->fileid) { |
968 | case BLKIO_THROTL_read_bps_device: | |
969 | case BLKIO_THROTL_write_bps_device: | |
970 | oldpn->val.bps = newpn->val.bps; | |
971 | break; | |
972 | case BLKIO_THROTL_read_iops_device: | |
973 | case BLKIO_THROTL_write_iops_device: | |
974 | oldpn->val.iops = newpn->val.iops; | |
975 | } | |
062a644d VG |
976 | break; |
977 | default: | |
978 | BUG(); | |
979 | } | |
980 | } | |
981 | ||
982 | /* | |
25985edc | 983 | * Some rules/values in blkg have changed. Propagate those to respective |
062a644d VG |
984 | * policies. |
985 | */ | |
986 | static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, | |
987 | struct blkio_group *blkg, struct blkio_policy_node *pn) | |
988 | { | |
7702e8f4 | 989 | unsigned int weight, iops; |
4c9eefa1 | 990 | u64 bps; |
062a644d VG |
991 | |
992 | switch(pn->plid) { | |
993 | case BLKIO_POLICY_PROP: | |
4c9eefa1 | 994 | weight = pn->val.weight ? pn->val.weight : |
062a644d VG |
995 | blkcg->weight; |
996 | blkio_update_group_weight(blkg, weight); | |
997 | break; | |
4c9eefa1 VG |
998 | case BLKIO_POLICY_THROTL: |
999 | switch(pn->fileid) { | |
1000 | case BLKIO_THROTL_read_bps_device: | |
1001 | case BLKIO_THROTL_write_bps_device: | |
1002 | bps = pn->val.bps ? pn->val.bps : (-1); | |
1003 | blkio_update_group_bps(blkg, bps, pn->fileid); | |
1004 | break; | |
7702e8f4 VG |
1005 | case BLKIO_THROTL_read_iops_device: |
1006 | case BLKIO_THROTL_write_iops_device: | |
1007 | iops = pn->val.iops ? pn->val.iops : (-1); | |
1008 | blkio_update_group_iops(blkg, iops, pn->fileid); | |
1009 | break; | |
4c9eefa1 VG |
1010 | } |
1011 | break; | |
062a644d VG |
1012 | default: |
1013 | BUG(); | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | /* | |
25985edc | 1018 | * A policy node rule has been updated. Propagate this update to all the |
062a644d VG |
1019 | * block groups which might be affected by this update. |
1020 | */ | |
1021 | static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, | |
1022 | struct blkio_policy_node *pn) | |
1023 | { | |
1024 | struct blkio_group *blkg; | |
1025 | struct hlist_node *n; | |
1026 | ||
1027 | spin_lock(&blkio_list_lock); | |
1028 | spin_lock_irq(&blkcg->lock); | |
34d0f179 | 1029 | |
062a644d VG |
1030 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1031 | if (pn->dev != blkg->dev || pn->plid != blkg->plid) | |
1032 | continue; | |
1033 | blkio_update_blkg_policy(blkcg, blkg, pn); | |
1034 | } | |
1035 | ||
1036 | spin_unlock_irq(&blkcg->lock); | |
1037 | spin_unlock(&blkio_list_lock); | |
1038 | } | |
34d0f179 | 1039 | |
062a644d VG |
1040 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, |
1041 | const char *buffer) | |
34d0f179 GJ |
1042 | { |
1043 | int ret = 0; | |
1044 | char *buf; | |
1045 | struct blkio_policy_node *newpn, *pn; | |
1046 | struct blkio_cgroup *blkcg; | |
34d0f179 | 1047 | int keep_newpn = 0; |
062a644d VG |
1048 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1049 | int fileid = BLKIOFILE_ATTR(cft->private); | |
34d0f179 GJ |
1050 | |
1051 | buf = kstrdup(buffer, GFP_KERNEL); | |
1052 | if (!buf) | |
1053 | return -ENOMEM; | |
1054 | ||
1055 | newpn = kzalloc(sizeof(*newpn), GFP_KERNEL); | |
1056 | if (!newpn) { | |
1057 | ret = -ENOMEM; | |
1058 | goto free_buf; | |
1059 | } | |
1060 | ||
062a644d | 1061 | ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid); |
34d0f179 GJ |
1062 | if (ret) |
1063 | goto free_newpn; | |
1064 | ||
1065 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1066 | ||
1067 | spin_lock_irq(&blkcg->lock); | |
1068 | ||
062a644d | 1069 | pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid); |
34d0f179 | 1070 | if (!pn) { |
062a644d | 1071 | if (!blkio_delete_rule_command(newpn)) { |
34d0f179 GJ |
1072 | blkio_policy_insert_node(blkcg, newpn); |
1073 | keep_newpn = 1; | |
1074 | } | |
1075 | spin_unlock_irq(&blkcg->lock); | |
1076 | goto update_io_group; | |
1077 | } | |
1078 | ||
062a644d | 1079 | if (blkio_delete_rule_command(newpn)) { |
34d0f179 | 1080 | blkio_policy_delete_node(pn); |
e060f00b | 1081 | kfree(pn); |
34d0f179 GJ |
1082 | spin_unlock_irq(&blkcg->lock); |
1083 | goto update_io_group; | |
1084 | } | |
1085 | spin_unlock_irq(&blkcg->lock); | |
1086 | ||
062a644d | 1087 | blkio_update_policy_rule(pn, newpn); |
34d0f179 GJ |
1088 | |
1089 | update_io_group: | |
062a644d | 1090 | blkio_update_policy_node_blkg(blkcg, newpn); |
34d0f179 GJ |
1091 | |
1092 | free_newpn: | |
1093 | if (!keep_newpn) | |
1094 | kfree(newpn); | |
1095 | free_buf: | |
1096 | kfree(buf); | |
1097 | return ret; | |
1098 | } | |
1099 | ||
062a644d VG |
1100 | static void |
1101 | blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) | |
34d0f179 | 1102 | { |
062a644d VG |
1103 | switch(pn->plid) { |
1104 | case BLKIO_POLICY_PROP: | |
1105 | if (pn->fileid == BLKIO_PROP_weight_device) | |
1106 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), | |
4c9eefa1 VG |
1107 | MINOR(pn->dev), pn->val.weight); |
1108 | break; | |
1109 | case BLKIO_POLICY_THROTL: | |
7702e8f4 VG |
1110 | switch(pn->fileid) { |
1111 | case BLKIO_THROTL_read_bps_device: | |
1112 | case BLKIO_THROTL_write_bps_device: | |
4c9eefa1 VG |
1113 | seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev), |
1114 | MINOR(pn->dev), pn->val.bps); | |
7702e8f4 VG |
1115 | break; |
1116 | case BLKIO_THROTL_read_iops_device: | |
1117 | case BLKIO_THROTL_write_iops_device: | |
1118 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), | |
1119 | MINOR(pn->dev), pn->val.iops); | |
1120 | break; | |
1121 | } | |
062a644d VG |
1122 | break; |
1123 | default: | |
1124 | BUG(); | |
1125 | } | |
1126 | } | |
34d0f179 | 1127 | |
062a644d VG |
1128 | /* cgroup files which read their data from policy nodes end up here */ |
1129 | static void blkio_read_policy_node_files(struct cftype *cft, | |
1130 | struct blkio_cgroup *blkcg, struct seq_file *m) | |
34d0f179 | 1131 | { |
34d0f179 | 1132 | struct blkio_policy_node *pn; |
34d0f179 | 1133 | |
0f3942a3 JA |
1134 | if (!list_empty(&blkcg->policy_list)) { |
1135 | spin_lock_irq(&blkcg->lock); | |
1136 | list_for_each_entry(pn, &blkcg->policy_list, node) { | |
062a644d VG |
1137 | if (!pn_matches_cftype(cft, pn)) |
1138 | continue; | |
1139 | blkio_print_policy_node(m, pn); | |
0f3942a3 JA |
1140 | } |
1141 | spin_unlock_irq(&blkcg->lock); | |
34d0f179 | 1142 | } |
062a644d VG |
1143 | } |
1144 | ||
1145 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, | |
1146 | struct seq_file *m) | |
1147 | { | |
1148 | struct blkio_cgroup *blkcg; | |
1149 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1150 | int name = BLKIOFILE_ATTR(cft->private); | |
1151 | ||
1152 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1153 | ||
1154 | switch(plid) { | |
1155 | case BLKIO_POLICY_PROP: | |
1156 | switch(name) { | |
1157 | case BLKIO_PROP_weight_device: | |
1158 | blkio_read_policy_node_files(cft, blkcg, m); | |
1159 | return 0; | |
1160 | default: | |
1161 | BUG(); | |
1162 | } | |
1163 | break; | |
4c9eefa1 VG |
1164 | case BLKIO_POLICY_THROTL: |
1165 | switch(name){ | |
1166 | case BLKIO_THROTL_read_bps_device: | |
1167 | case BLKIO_THROTL_write_bps_device: | |
7702e8f4 VG |
1168 | case BLKIO_THROTL_read_iops_device: |
1169 | case BLKIO_THROTL_write_iops_device: | |
4c9eefa1 VG |
1170 | blkio_read_policy_node_files(cft, blkcg, m); |
1171 | return 0; | |
1172 | default: | |
1173 | BUG(); | |
1174 | } | |
1175 | break; | |
062a644d VG |
1176 | default: |
1177 | BUG(); | |
1178 | } | |
1179 | ||
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, | |
5624a4e4 VG |
1184 | struct cftype *cft, struct cgroup_map_cb *cb, |
1185 | enum stat_type type, bool show_total, bool pcpu) | |
062a644d VG |
1186 | { |
1187 | struct blkio_group *blkg; | |
1188 | struct hlist_node *n; | |
1189 | uint64_t cgroup_total = 0; | |
1190 | ||
1191 | rcu_read_lock(); | |
1192 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
1193 | if (blkg->dev) { | |
1194 | if (!cftype_blkg_same_policy(cft, blkg)) | |
1195 | continue; | |
5624a4e4 VG |
1196 | if (pcpu) |
1197 | cgroup_total += blkio_get_stat_cpu(blkg, cb, | |
1198 | blkg->dev, type); | |
1199 | else { | |
1200 | spin_lock_irq(&blkg->stats_lock); | |
1201 | cgroup_total += blkio_get_stat(blkg, cb, | |
1202 | blkg->dev, type); | |
1203 | spin_unlock_irq(&blkg->stats_lock); | |
1204 | } | |
062a644d VG |
1205 | } |
1206 | } | |
1207 | if (show_total) | |
1208 | cb->fill(cb, "Total", cgroup_total); | |
1209 | rcu_read_unlock(); | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | /* All map kind of cgroup file get serviced by this function */ | |
1214 | static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, | |
1215 | struct cgroup_map_cb *cb) | |
1216 | { | |
1217 | struct blkio_cgroup *blkcg; | |
1218 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1219 | int name = BLKIOFILE_ATTR(cft->private); | |
1220 | ||
1221 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1222 | ||
1223 | switch(plid) { | |
1224 | case BLKIO_POLICY_PROP: | |
1225 | switch(name) { | |
1226 | case BLKIO_PROP_time: | |
1227 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1228 | BLKIO_STAT_TIME, 0, 0); |
062a644d VG |
1229 | case BLKIO_PROP_sectors: |
1230 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1231 | BLKIO_STAT_CPU_SECTORS, 0, 1); |
062a644d VG |
1232 | case BLKIO_PROP_io_service_bytes: |
1233 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1234 | BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
062a644d VG |
1235 | case BLKIO_PROP_io_serviced: |
1236 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1237 | BLKIO_STAT_CPU_SERVICED, 1, 1); |
062a644d VG |
1238 | case BLKIO_PROP_io_service_time: |
1239 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1240 | BLKIO_STAT_SERVICE_TIME, 1, 0); |
062a644d VG |
1241 | case BLKIO_PROP_io_wait_time: |
1242 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1243 | BLKIO_STAT_WAIT_TIME, 1, 0); |
062a644d VG |
1244 | case BLKIO_PROP_io_merged: |
1245 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
317389a7 | 1246 | BLKIO_STAT_CPU_MERGED, 1, 1); |
062a644d VG |
1247 | case BLKIO_PROP_io_queued: |
1248 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1249 | BLKIO_STAT_QUEUED, 1, 0); |
062a644d | 1250 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
9026e521 JT |
1251 | case BLKIO_PROP_unaccounted_time: |
1252 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1253 | BLKIO_STAT_UNACCOUNTED_TIME, 0, 0); |
062a644d VG |
1254 | case BLKIO_PROP_dequeue: |
1255 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1256 | BLKIO_STAT_DEQUEUE, 0, 0); |
062a644d VG |
1257 | case BLKIO_PROP_avg_queue_size: |
1258 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1259 | BLKIO_STAT_AVG_QUEUE_SIZE, 0, 0); |
062a644d VG |
1260 | case BLKIO_PROP_group_wait_time: |
1261 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1262 | BLKIO_STAT_GROUP_WAIT_TIME, 0, 0); |
062a644d VG |
1263 | case BLKIO_PROP_idle_time: |
1264 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1265 | BLKIO_STAT_IDLE_TIME, 0, 0); |
062a644d VG |
1266 | case BLKIO_PROP_empty_time: |
1267 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1268 | BLKIO_STAT_EMPTY_TIME, 0, 0); |
062a644d VG |
1269 | #endif |
1270 | default: | |
1271 | BUG(); | |
1272 | } | |
1273 | break; | |
4c9eefa1 VG |
1274 | case BLKIO_POLICY_THROTL: |
1275 | switch(name){ | |
1276 | case BLKIO_THROTL_io_service_bytes: | |
1277 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1278 | BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
4c9eefa1 VG |
1279 | case BLKIO_THROTL_io_serviced: |
1280 | return blkio_read_blkg_stats(blkcg, cft, cb, | |
5624a4e4 | 1281 | BLKIO_STAT_CPU_SERVICED, 1, 1); |
4c9eefa1 VG |
1282 | default: |
1283 | BUG(); | |
1284 | } | |
1285 | break; | |
062a644d VG |
1286 | default: |
1287 | BUG(); | |
1288 | } | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) | |
1294 | { | |
1295 | struct blkio_group *blkg; | |
1296 | struct hlist_node *n; | |
1297 | struct blkio_policy_node *pn; | |
1298 | ||
1299 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) | |
1300 | return -EINVAL; | |
1301 | ||
1302 | spin_lock(&blkio_list_lock); | |
1303 | spin_lock_irq(&blkcg->lock); | |
1304 | blkcg->weight = (unsigned int)val; | |
1305 | ||
1306 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { | |
1307 | pn = blkio_policy_search_node(blkcg, blkg->dev, | |
1308 | BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); | |
1309 | if (pn) | |
1310 | continue; | |
1311 | ||
1312 | blkio_update_group_weight(blkg, blkcg->weight); | |
1313 | } | |
1314 | spin_unlock_irq(&blkcg->lock); | |
1315 | spin_unlock(&blkio_list_lock); | |
1316 | return 0; | |
1317 | } | |
1318 | ||
1319 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { | |
1320 | struct blkio_cgroup *blkcg; | |
1321 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1322 | int name = BLKIOFILE_ATTR(cft->private); | |
1323 | ||
1324 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1325 | ||
1326 | switch(plid) { | |
1327 | case BLKIO_POLICY_PROP: | |
1328 | switch(name) { | |
1329 | case BLKIO_PROP_weight: | |
1330 | return (u64)blkcg->weight; | |
1331 | } | |
1332 | break; | |
1333 | default: | |
1334 | BUG(); | |
1335 | } | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | static int | |
1340 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) | |
1341 | { | |
1342 | struct blkio_cgroup *blkcg; | |
1343 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); | |
1344 | int name = BLKIOFILE_ATTR(cft->private); | |
1345 | ||
1346 | blkcg = cgroup_to_blkio_cgroup(cgrp); | |
1347 | ||
1348 | switch(plid) { | |
1349 | case BLKIO_POLICY_PROP: | |
1350 | switch(name) { | |
1351 | case BLKIO_PROP_weight: | |
1352 | return blkio_weight_write(blkcg, val); | |
1353 | } | |
1354 | break; | |
1355 | default: | |
1356 | BUG(); | |
1357 | } | |
34d0f179 | 1358 | |
34d0f179 GJ |
1359 | return 0; |
1360 | } | |
1361 | ||
31e4c28d | 1362 | struct cftype blkio_files[] = { |
34d0f179 GJ |
1363 | { |
1364 | .name = "weight_device", | |
062a644d VG |
1365 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1366 | BLKIO_PROP_weight_device), | |
1367 | .read_seq_string = blkiocg_file_read, | |
1368 | .write_string = blkiocg_file_write, | |
34d0f179 GJ |
1369 | .max_write_len = 256, |
1370 | }, | |
31e4c28d VG |
1371 | { |
1372 | .name = "weight", | |
062a644d VG |
1373 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1374 | BLKIO_PROP_weight), | |
1375 | .read_u64 = blkiocg_file_read_u64, | |
1376 | .write_u64 = blkiocg_file_write_u64, | |
31e4c28d | 1377 | }, |
22084190 VG |
1378 | { |
1379 | .name = "time", | |
062a644d VG |
1380 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1381 | BLKIO_PROP_time), | |
1382 | .read_map = blkiocg_file_read_map, | |
22084190 VG |
1383 | }, |
1384 | { | |
1385 | .name = "sectors", | |
062a644d VG |
1386 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1387 | BLKIO_PROP_sectors), | |
1388 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1389 | }, |
1390 | { | |
1391 | .name = "io_service_bytes", | |
062a644d VG |
1392 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1393 | BLKIO_PROP_io_service_bytes), | |
1394 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1395 | }, |
1396 | { | |
1397 | .name = "io_serviced", | |
062a644d VG |
1398 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1399 | BLKIO_PROP_io_serviced), | |
1400 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1401 | }, |
1402 | { | |
1403 | .name = "io_service_time", | |
062a644d VG |
1404 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1405 | BLKIO_PROP_io_service_time), | |
1406 | .read_map = blkiocg_file_read_map, | |
303a3acb DS |
1407 | }, |
1408 | { | |
1409 | .name = "io_wait_time", | |
062a644d VG |
1410 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1411 | BLKIO_PROP_io_wait_time), | |
1412 | .read_map = blkiocg_file_read_map, | |
84c124da | 1413 | }, |
812d4026 DS |
1414 | { |
1415 | .name = "io_merged", | |
062a644d VG |
1416 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1417 | BLKIO_PROP_io_merged), | |
1418 | .read_map = blkiocg_file_read_map, | |
812d4026 | 1419 | }, |
cdc1184c DS |
1420 | { |
1421 | .name = "io_queued", | |
062a644d VG |
1422 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1423 | BLKIO_PROP_io_queued), | |
1424 | .read_map = blkiocg_file_read_map, | |
cdc1184c | 1425 | }, |
84c124da DS |
1426 | { |
1427 | .name = "reset_stats", | |
1428 | .write_u64 = blkiocg_reset_stats, | |
22084190 | 1429 | }, |
13f98250 VG |
1430 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1431 | { | |
1432 | .name = "throttle.read_bps_device", | |
1433 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1434 | BLKIO_THROTL_read_bps_device), | |
1435 | .read_seq_string = blkiocg_file_read, | |
1436 | .write_string = blkiocg_file_write, | |
1437 | .max_write_len = 256, | |
1438 | }, | |
1439 | ||
1440 | { | |
1441 | .name = "throttle.write_bps_device", | |
1442 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1443 | BLKIO_THROTL_write_bps_device), | |
1444 | .read_seq_string = blkiocg_file_read, | |
1445 | .write_string = blkiocg_file_write, | |
1446 | .max_write_len = 256, | |
1447 | }, | |
1448 | ||
1449 | { | |
1450 | .name = "throttle.read_iops_device", | |
1451 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1452 | BLKIO_THROTL_read_iops_device), | |
1453 | .read_seq_string = blkiocg_file_read, | |
1454 | .write_string = blkiocg_file_write, | |
1455 | .max_write_len = 256, | |
1456 | }, | |
1457 | ||
1458 | { | |
1459 | .name = "throttle.write_iops_device", | |
1460 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1461 | BLKIO_THROTL_write_iops_device), | |
1462 | .read_seq_string = blkiocg_file_read, | |
1463 | .write_string = blkiocg_file_write, | |
1464 | .max_write_len = 256, | |
1465 | }, | |
1466 | { | |
1467 | .name = "throttle.io_service_bytes", | |
1468 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1469 | BLKIO_THROTL_io_service_bytes), | |
1470 | .read_map = blkiocg_file_read_map, | |
1471 | }, | |
1472 | { | |
1473 | .name = "throttle.io_serviced", | |
1474 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, | |
1475 | BLKIO_THROTL_io_serviced), | |
1476 | .read_map = blkiocg_file_read_map, | |
1477 | }, | |
1478 | #endif /* CONFIG_BLK_DEV_THROTTLING */ | |
1479 | ||
22084190 | 1480 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
cdc1184c DS |
1481 | { |
1482 | .name = "avg_queue_size", | |
062a644d VG |
1483 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1484 | BLKIO_PROP_avg_queue_size), | |
1485 | .read_map = blkiocg_file_read_map, | |
cdc1184c | 1486 | }, |
812df48d DS |
1487 | { |
1488 | .name = "group_wait_time", | |
062a644d VG |
1489 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1490 | BLKIO_PROP_group_wait_time), | |
1491 | .read_map = blkiocg_file_read_map, | |
812df48d DS |
1492 | }, |
1493 | { | |
1494 | .name = "idle_time", | |
062a644d VG |
1495 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1496 | BLKIO_PROP_idle_time), | |
1497 | .read_map = blkiocg_file_read_map, | |
812df48d DS |
1498 | }, |
1499 | { | |
1500 | .name = "empty_time", | |
062a644d VG |
1501 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1502 | BLKIO_PROP_empty_time), | |
1503 | .read_map = blkiocg_file_read_map, | |
812df48d | 1504 | }, |
cdc1184c | 1505 | { |
22084190 | 1506 | .name = "dequeue", |
062a644d VG |
1507 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1508 | BLKIO_PROP_dequeue), | |
1509 | .read_map = blkiocg_file_read_map, | |
cdc1184c | 1510 | }, |
9026e521 JT |
1511 | { |
1512 | .name = "unaccounted_time", | |
1513 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, | |
1514 | BLKIO_PROP_unaccounted_time), | |
1515 | .read_map = blkiocg_file_read_map, | |
1516 | }, | |
22084190 | 1517 | #endif |
31e4c28d VG |
1518 | }; |
1519 | ||
1520 | static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) | |
1521 | { | |
1522 | return cgroup_add_files(cgroup, subsys, blkio_files, | |
1523 | ARRAY_SIZE(blkio_files)); | |
1524 | } | |
1525 | ||
761b3ef5 | 1526 | static void blkiocg_destroy(struct cgroup *cgroup) |
31e4c28d VG |
1527 | { |
1528 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); | |
b1c35769 VG |
1529 | unsigned long flags; |
1530 | struct blkio_group *blkg; | |
1531 | void *key; | |
3e252066 | 1532 | struct blkio_policy_type *blkiop; |
34d0f179 | 1533 | struct blkio_policy_node *pn, *pntmp; |
b1c35769 VG |
1534 | |
1535 | rcu_read_lock(); | |
0f3942a3 JA |
1536 | do { |
1537 | spin_lock_irqsave(&blkcg->lock, flags); | |
b1c35769 | 1538 | |
0f3942a3 JA |
1539 | if (hlist_empty(&blkcg->blkg_list)) { |
1540 | spin_unlock_irqrestore(&blkcg->lock, flags); | |
1541 | break; | |
1542 | } | |
b1c35769 | 1543 | |
0f3942a3 JA |
1544 | blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, |
1545 | blkcg_node); | |
1546 | key = rcu_dereference(blkg->key); | |
1547 | __blkiocg_del_blkio_group(blkg); | |
31e4c28d | 1548 | |
0f3942a3 | 1549 | spin_unlock_irqrestore(&blkcg->lock, flags); |
b1c35769 | 1550 | |
0f3942a3 JA |
1551 | /* |
1552 | * This blkio_group is being unlinked as associated cgroup is | |
1553 | * going away. Let all the IO controlling policies know about | |
61014e96 | 1554 | * this event. |
0f3942a3 JA |
1555 | */ |
1556 | spin_lock(&blkio_list_lock); | |
61014e96 VG |
1557 | list_for_each_entry(blkiop, &blkio_list, list) { |
1558 | if (blkiop->plid != blkg->plid) | |
1559 | continue; | |
0f3942a3 | 1560 | blkiop->ops.blkio_unlink_group_fn(key, blkg); |
61014e96 | 1561 | } |
0f3942a3 JA |
1562 | spin_unlock(&blkio_list_lock); |
1563 | } while (1); | |
34d0f179 | 1564 | |
34d0f179 GJ |
1565 | list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { |
1566 | blkio_policy_delete_node(pn); | |
1567 | kfree(pn); | |
1568 | } | |
0f3942a3 | 1569 | |
31e4c28d | 1570 | free_css_id(&blkio_subsys, &blkcg->css); |
b1c35769 | 1571 | rcu_read_unlock(); |
67523c48 BB |
1572 | if (blkcg != &blkio_root_cgroup) |
1573 | kfree(blkcg); | |
31e4c28d VG |
1574 | } |
1575 | ||
761b3ef5 | 1576 | static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup) |
31e4c28d | 1577 | { |
0341509f LZ |
1578 | struct blkio_cgroup *blkcg; |
1579 | struct cgroup *parent = cgroup->parent; | |
31e4c28d | 1580 | |
0341509f | 1581 | if (!parent) { |
31e4c28d VG |
1582 | blkcg = &blkio_root_cgroup; |
1583 | goto done; | |
1584 | } | |
1585 | ||
31e4c28d VG |
1586 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); |
1587 | if (!blkcg) | |
1588 | return ERR_PTR(-ENOMEM); | |
1589 | ||
1590 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; | |
1591 | done: | |
1592 | spin_lock_init(&blkcg->lock); | |
1593 | INIT_HLIST_HEAD(&blkcg->blkg_list); | |
1594 | ||
34d0f179 | 1595 | INIT_LIST_HEAD(&blkcg->policy_list); |
31e4c28d VG |
1596 | return &blkcg->css; |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * We cannot support shared io contexts, as we have no mean to support | |
1601 | * two tasks with the same ioc in two different groups without major rework | |
1602 | * of the main cic data structures. For now we allow a task to change | |
1603 | * its cgroup only if it's the only owner of its ioc. | |
1604 | */ | |
761b3ef5 | 1605 | static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) |
31e4c28d | 1606 | { |
bb9d97b6 | 1607 | struct task_struct *task; |
31e4c28d VG |
1608 | struct io_context *ioc; |
1609 | int ret = 0; | |
1610 | ||
1611 | /* task_lock() is needed to avoid races with exit_io_context() */ | |
bb9d97b6 TH |
1612 | cgroup_taskset_for_each(task, cgrp, tset) { |
1613 | task_lock(task); | |
1614 | ioc = task->io_context; | |
1615 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) | |
1616 | ret = -EINVAL; | |
1617 | task_unlock(task); | |
1618 | if (ret) | |
1619 | break; | |
1620 | } | |
31e4c28d VG |
1621 | return ret; |
1622 | } | |
1623 | ||
761b3ef5 | 1624 | static void blkiocg_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) |
31e4c28d | 1625 | { |
bb9d97b6 | 1626 | struct task_struct *task; |
31e4c28d VG |
1627 | struct io_context *ioc; |
1628 | ||
bb9d97b6 | 1629 | cgroup_taskset_for_each(task, cgrp, tset) { |
b3c9dd18 LT |
1630 | /* we don't lose anything even if ioc allocation fails */ |
1631 | ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE); | |
1632 | if (ioc) { | |
1633 | ioc_cgroup_changed(ioc); | |
11a3122f | 1634 | put_io_context(ioc); |
b3c9dd18 | 1635 | } |
bb9d97b6 | 1636 | } |
31e4c28d VG |
1637 | } |
1638 | ||
676f7c8f TH |
1639 | struct cgroup_subsys blkio_subsys = { |
1640 | .name = "blkio", | |
1641 | .create = blkiocg_create, | |
1642 | .can_attach = blkiocg_can_attach, | |
1643 | .attach = blkiocg_attach, | |
1644 | .destroy = blkiocg_destroy, | |
1645 | .populate = blkiocg_populate, | |
1646 | #ifdef CONFIG_BLK_CGROUP | |
1647 | /* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */ | |
1648 | .subsys_id = blkio_subsys_id, | |
1649 | #endif | |
1650 | .use_id = 1, | |
1651 | .module = THIS_MODULE, | |
1652 | }; | |
1653 | EXPORT_SYMBOL_GPL(blkio_subsys); | |
1654 | ||
3e252066 VG |
1655 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
1656 | { | |
1657 | spin_lock(&blkio_list_lock); | |
1658 | list_add_tail(&blkiop->list, &blkio_list); | |
1659 | spin_unlock(&blkio_list_lock); | |
1660 | } | |
1661 | EXPORT_SYMBOL_GPL(blkio_policy_register); | |
1662 | ||
1663 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) | |
1664 | { | |
1665 | spin_lock(&blkio_list_lock); | |
1666 | list_del_init(&blkiop->list); | |
1667 | spin_unlock(&blkio_list_lock); | |
1668 | } | |
1669 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); | |
67523c48 BB |
1670 | |
1671 | static int __init init_cgroup_blkio(void) | |
1672 | { | |
1673 | return cgroup_load_subsys(&blkio_subsys); | |
1674 | } | |
1675 | ||
1676 | static void __exit exit_cgroup_blkio(void) | |
1677 | { | |
1678 | cgroup_unload_subsys(&blkio_subsys); | |
1679 | } | |
1680 | ||
1681 | module_init(init_cgroup_blkio); | |
1682 | module_exit(exit_cgroup_blkio); | |
1683 | MODULE_LICENSE("GPL"); |