Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cafe5635 KO |
2 | /* |
3 | * bcache sysfs interfaces | |
4 | * | |
5 | * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> | |
6 | * Copyright 2012 Google, Inc. | |
7 | */ | |
8 | ||
9 | #include "bcache.h" | |
10 | #include "sysfs.h" | |
11 | #include "btree.h" | |
12 | #include "request.h" | |
279afbad | 13 | #include "writeback.h" |
cafe5635 | 14 | |
c37511b8 | 15 | #include <linux/blkdev.h> |
cafe5635 | 16 | #include <linux/sort.h> |
e6017571 | 17 | #include <linux/sched/clock.h> |
cafe5635 | 18 | |
a59ff6cc CL |
19 | extern bool bcache_is_reboot; |
20 | ||
4e361e02 | 21 | /* Default is 0 ("writethrough") */ |
04cbc211 | 22 | static const char * const bch_cache_modes[] = { |
04cbc211 AS |
23 | "writethrough", |
24 | "writeback", | |
25 | "writearound", | |
20621fed CL |
26 | "none", |
27 | NULL | |
04cbc211 AS |
28 | }; |
29 | ||
4e361e02 | 30 | /* Default is 0 ("auto") */ |
04cbc211 | 31 | static const char * const bch_stop_on_failure_modes[] = { |
04cbc211 | 32 | "auto", |
20621fed CL |
33 | "always", |
34 | NULL | |
04cbc211 AS |
35 | }; |
36 | ||
cafe5635 KO |
37 | static const char * const cache_replacement_policies[] = { |
38 | "lru", | |
39 | "fifo", | |
20621fed CL |
40 | "random", |
41 | NULL | |
cafe5635 KO |
42 | }; |
43 | ||
77c320eb KO |
44 | static const char * const error_actions[] = { |
45 | "unregister", | |
20621fed CL |
46 | "panic", |
47 | NULL | |
77c320eb KO |
48 | }; |
49 | ||
cafe5635 KO |
50 | write_attribute(attach); |
51 | write_attribute(detach); | |
52 | write_attribute(unregister); | |
53 | write_attribute(stop); | |
54 | write_attribute(clear_stats); | |
55 | write_attribute(trigger_gc); | |
56 | write_attribute(prune_cache); | |
57 | write_attribute(flash_vol_create); | |
58 | ||
59 | read_attribute(bucket_size); | |
60 | read_attribute(block_size); | |
61 | read_attribute(nbuckets); | |
62 | read_attribute(tree_depth); | |
63 | read_attribute(root_usage_percent); | |
64 | read_attribute(priority_stats); | |
65 | read_attribute(btree_cache_size); | |
66 | read_attribute(btree_cache_max_chain); | |
67 | read_attribute(cache_available_percent); | |
68 | read_attribute(written); | |
69 | read_attribute(btree_written); | |
70 | read_attribute(metadata_written); | |
71 | read_attribute(active_journal_entries); | |
926d1946 | 72 | read_attribute(backing_dev_name); |
d4610456 | 73 | read_attribute(backing_dev_uuid); |
cafe5635 KO |
74 | |
75 | sysfs_time_stats_attribute(btree_gc, sec, ms); | |
76 | sysfs_time_stats_attribute(btree_split, sec, us); | |
77 | sysfs_time_stats_attribute(btree_sort, ms, us); | |
78 | sysfs_time_stats_attribute(btree_read, ms, us); | |
cafe5635 KO |
79 | |
80 | read_attribute(btree_nodes); | |
81 | read_attribute(btree_used_percent); | |
82 | read_attribute(average_key_size); | |
83 | read_attribute(dirty_data); | |
84 | read_attribute(bset_tree_stats); | |
85 | ||
86 | read_attribute(state); | |
87 | read_attribute(cache_read_races); | |
a728eacb | 88 | read_attribute(reclaim); |
dff90d58 | 89 | read_attribute(reclaimed_journal_buckets); |
a728eacb | 90 | read_attribute(flush_write); |
cafe5635 KO |
91 | read_attribute(writeback_keys_done); |
92 | read_attribute(writeback_keys_failed); | |
93 | read_attribute(io_errors); | |
94 | read_attribute(congested); | |
9aaf5165 CL |
95 | read_attribute(cutoff_writeback); |
96 | read_attribute(cutoff_writeback_sync); | |
cafe5635 KO |
97 | rw_attribute(congested_read_threshold_us); |
98 | rw_attribute(congested_write_threshold_us); | |
99 | ||
100 | rw_attribute(sequential_cutoff); | |
cafe5635 KO |
101 | rw_attribute(data_csum); |
102 | rw_attribute(cache_mode); | |
7e027ca4 | 103 | rw_attribute(stop_when_cache_set_failed); |
cafe5635 KO |
104 | rw_attribute(writeback_metadata); |
105 | rw_attribute(writeback_running); | |
106 | rw_attribute(writeback_percent); | |
107 | rw_attribute(writeback_delay); | |
108 | rw_attribute(writeback_rate); | |
109 | ||
110 | rw_attribute(writeback_rate_update_seconds); | |
1d316e65 | 111 | rw_attribute(writeback_rate_i_term_inverse); |
cafe5635 | 112 | rw_attribute(writeback_rate_p_term_inverse); |
1d316e65 | 113 | rw_attribute(writeback_rate_minimum); |
cafe5635 KO |
114 | read_attribute(writeback_rate_debug); |
115 | ||
72c27061 KO |
116 | read_attribute(stripe_size); |
117 | read_attribute(partial_stripes_expensive); | |
118 | ||
cafe5635 KO |
119 | rw_attribute(synchronous); |
120 | rw_attribute(journal_delay_ms); | |
771f393e | 121 | rw_attribute(io_disable); |
cafe5635 KO |
122 | rw_attribute(discard); |
123 | rw_attribute(running); | |
124 | rw_attribute(label); | |
125 | rw_attribute(readahead); | |
77c320eb | 126 | rw_attribute(errors); |
cafe5635 KO |
127 | rw_attribute(io_error_limit); |
128 | rw_attribute(io_error_halflife); | |
129 | rw_attribute(verify); | |
5ceaaad7 | 130 | rw_attribute(bypass_torture_test); |
cafe5635 KO |
131 | rw_attribute(key_merging_disabled); |
132 | rw_attribute(gc_always_rewrite); | |
280481d0 | 133 | rw_attribute(expensive_debug_checks); |
cafe5635 KO |
134 | rw_attribute(cache_replacement_policy); |
135 | rw_attribute(btree_shrinker_disabled); | |
136 | rw_attribute(copy_gc_enabled); | |
7a671d8e | 137 | rw_attribute(gc_after_writeback); |
cafe5635 KO |
138 | rw_attribute(size); |
139 | ||
b0d30981 CL |
140 | static ssize_t bch_snprint_string_list(char *buf, |
141 | size_t size, | |
142 | const char * const list[], | |
143 | size_t selected) | |
ecb37ce9 AS |
144 | { |
145 | char *out = buf; | |
146 | size_t i; | |
147 | ||
148 | for (i = 0; list[i]; i++) | |
149 | out += snprintf(out, buf + size - out, | |
150 | i == selected ? "[%s] " : "%s ", list[i]); | |
151 | ||
152 | out[-1] = '\n'; | |
153 | return out - buf; | |
154 | } | |
155 | ||
cafe5635 KO |
156 | SHOW(__bch_cached_dev) |
157 | { | |
158 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
159 | disk.kobj); | |
e1f08f1b | 160 | char const *states[] = { "no cache", "clean", "dirty", "inconsistent" }; |
b4cb6efc | 161 | int wb = dc->writeback_running; |
cafe5635 KO |
162 | |
163 | #define var(stat) (dc->stat) | |
164 | ||
165 | if (attr == &sysfs_cache_mode) | |
169ef1cf | 166 | return bch_snprint_string_list(buf, PAGE_SIZE, |
ce4c3e19 | 167 | bch_cache_modes, |
169ef1cf | 168 | BDEV_CACHE_MODE(&dc->sb)); |
cafe5635 | 169 | |
7e027ca4 CL |
170 | if (attr == &sysfs_stop_when_cache_set_failed) |
171 | return bch_snprint_string_list(buf, PAGE_SIZE, | |
ce4c3e19 | 172 | bch_stop_on_failure_modes, |
7e027ca4 CL |
173 | dc->stop_when_cache_set_failed); |
174 | ||
175 | ||
cafe5635 KO |
176 | sysfs_printf(data_csum, "%i", dc->disk.data_csum); |
177 | var_printf(verify, "%i"); | |
5ceaaad7 | 178 | var_printf(bypass_torture_test, "%i"); |
cafe5635 KO |
179 | var_printf(writeback_metadata, "%i"); |
180 | var_printf(writeback_running, "%i"); | |
181 | var_print(writeback_delay); | |
182 | var_print(writeback_percent); | |
ea8c5356 CL |
183 | sysfs_hprint(writeback_rate, |
184 | wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0); | |
54619998 | 185 | sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors)); |
c7b7bd07 CL |
186 | sysfs_printf(io_error_limit, "%i", dc->error_limit); |
187 | sysfs_printf(io_disable, "%i", dc->io_disable); | |
cafe5635 | 188 | var_print(writeback_rate_update_seconds); |
1d316e65 | 189 | var_print(writeback_rate_i_term_inverse); |
cafe5635 | 190 | var_print(writeback_rate_p_term_inverse); |
1d316e65 | 191 | var_print(writeback_rate_minimum); |
cafe5635 KO |
192 | |
193 | if (attr == &sysfs_writeback_rate_debug) { | |
16749c23 | 194 | char rate[20]; |
cafe5635 | 195 | char dirty[20]; |
cafe5635 | 196 | char target[20]; |
16749c23 | 197 | char proportional[20]; |
1d316e65 | 198 | char integral[20]; |
16749c23 KO |
199 | char change[20]; |
200 | s64 next_io; | |
201 | ||
b4cb6efc CL |
202 | /* |
203 | * Except for dirty and target, other values should | |
204 | * be 0 if writeback is not running. | |
205 | */ | |
ea8c5356 CL |
206 | bch_hprint(rate, |
207 | wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 | |
208 | : 0); | |
b4cb6efc CL |
209 | bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); |
210 | bch_hprint(target, dc->writeback_rate_target << 9); | |
211 | bch_hprint(proportional, | |
212 | wb ? dc->writeback_rate_proportional << 9 : 0); | |
213 | bch_hprint(integral, | |
214 | wb ? dc->writeback_rate_integral_scaled << 9 : 0); | |
215 | bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0); | |
216 | next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(), | |
217 | NSEC_PER_MSEC) : 0; | |
cafe5635 KO |
218 | |
219 | return sprintf(buf, | |
16749c23 | 220 | "rate:\t\t%s/sec\n" |
cafe5635 | 221 | "dirty:\t\t%s\n" |
16749c23 KO |
222 | "target:\t\t%s\n" |
223 | "proportional:\t%s\n" | |
1d316e65 | 224 | "integral:\t%s\n" |
16749c23 KO |
225 | "change:\t\t%s/sec\n" |
226 | "next io:\t%llims\n", | |
227 | rate, dirty, target, proportional, | |
1d316e65 | 228 | integral, change, next_io); |
cafe5635 KO |
229 | } |
230 | ||
231 | sysfs_hprint(dirty_data, | |
279afbad | 232 | bcache_dev_sectors_dirty(&dc->disk) << 9); |
cafe5635 | 233 | |
688892b3 | 234 | sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9); |
72c27061 KO |
235 | var_printf(partial_stripes_expensive, "%u"); |
236 | ||
cafe5635 KO |
237 | var_hprint(sequential_cutoff); |
238 | var_hprint(readahead); | |
239 | ||
240 | sysfs_print(running, atomic_read(&dc->running)); | |
241 | sysfs_print(state, states[BDEV_STATE(&dc->sb)]); | |
242 | ||
243 | if (attr == &sysfs_label) { | |
244 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); | |
245 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
246 | strcat(buf, "\n"); | |
247 | return strlen(buf); | |
248 | } | |
249 | ||
926d1946 CL |
250 | if (attr == &sysfs_backing_dev_name) { |
251 | snprintf(buf, BDEVNAME_SIZE + 1, "%s", dc->backing_dev_name); | |
252 | strcat(buf, "\n"); | |
253 | return strlen(buf); | |
254 | } | |
255 | ||
d4610456 CL |
256 | if (attr == &sysfs_backing_dev_uuid) { |
257 | /* convert binary uuid into 36-byte string plus '\0' */ | |
258 | snprintf(buf, 36+1, "%pU", dc->sb.uuid); | |
259 | strcat(buf, "\n"); | |
260 | return strlen(buf); | |
261 | } | |
262 | ||
cafe5635 KO |
263 | #undef var |
264 | return 0; | |
265 | } | |
266 | SHOW_LOCKED(bch_cached_dev) | |
267 | ||
268 | STORE(__cached_dev) | |
269 | { | |
270 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
271 | disk.kobj); | |
7f4fc93d | 272 | ssize_t v; |
cafe5635 | 273 | struct cache_set *c; |
ab9e1400 | 274 | struct kobj_uevent_env *env; |
cafe5635 | 275 | |
a59ff6cc CL |
276 | /* no user space access if system is rebooting */ |
277 | if (bcache_is_reboot) | |
278 | return -EBUSY; | |
279 | ||
cafe5635 | 280 | #define d_strtoul(var) sysfs_strtoul(var, dc->var) |
16749c23 | 281 | #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) |
cafe5635 KO |
282 | #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) |
283 | ||
284 | sysfs_strtoul(data_csum, dc->disk.data_csum); | |
285 | d_strtoul(verify); | |
f5c0b95d CL |
286 | sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test); |
287 | sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata); | |
288 | sysfs_strtoul_bool(writeback_running, dc->writeback_running); | |
369d21a7 | 289 | sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX); |
16749c23 | 290 | |
cc38ca7e CL |
291 | sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, |
292 | 0, bch_cutoff_writeback); | |
cafe5635 | 293 | |
ea8c5356 | 294 | if (attr == &sysfs_writeback_rate) { |
46451874 CL |
295 | ssize_t ret; |
296 | long int v = atomic_long_read(&dc->writeback_rate.rate); | |
ea8c5356 | 297 | |
46451874 CL |
298 | ret = strtoul_safe_clamp(buf, v, 1, INT_MAX); |
299 | ||
300 | if (!ret) { | |
301 | atomic_long_set(&dc->writeback_rate.rate, v); | |
302 | ret = size; | |
303 | } | |
304 | ||
305 | return ret; | |
ea8c5356 | 306 | } |
16749c23 | 307 | |
7a5e3ecb CL |
308 | sysfs_strtoul_clamp(writeback_rate_update_seconds, |
309 | dc->writeback_rate_update_seconds, | |
310 | 1, WRITEBACK_RATE_UPDATE_SECS_MAX); | |
c3b75a21 CL |
311 | sysfs_strtoul_clamp(writeback_rate_i_term_inverse, |
312 | dc->writeback_rate_i_term_inverse, | |
313 | 1, UINT_MAX); | |
5b5fd3c9 CL |
314 | sysfs_strtoul_clamp(writeback_rate_p_term_inverse, |
315 | dc->writeback_rate_p_term_inverse, | |
316 | 1, UINT_MAX); | |
dab71b2d CL |
317 | sysfs_strtoul_clamp(writeback_rate_minimum, |
318 | dc->writeback_rate_minimum, | |
319 | 1, UINT_MAX); | |
cafe5635 | 320 | |
c7b7bd07 CL |
321 | sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX); |
322 | ||
323 | if (attr == &sysfs_io_disable) { | |
324 | int v = strtoul_or_return(buf); | |
325 | ||
326 | dc->io_disable = v ? 1 : 0; | |
327 | } | |
328 | ||
8c27a395 CL |
329 | sysfs_strtoul_clamp(sequential_cutoff, |
330 | dc->sequential_cutoff, | |
331 | 0, UINT_MAX); | |
cafe5635 KO |
332 | d_strtoi_h(readahead); |
333 | ||
334 | if (attr == &sysfs_clear_stats) | |
335 | bch_cache_accounting_clear(&dc->accounting); | |
336 | ||
337 | if (attr == &sysfs_running && | |
0b13efec CL |
338 | strtoul_or_return(buf)) { |
339 | v = bch_cached_dev_run(dc); | |
340 | if (v) | |
341 | return v; | |
342 | } | |
cafe5635 KO |
343 | |
344 | if (attr == &sysfs_cache_mode) { | |
20621fed | 345 | v = __sysfs_match_string(bch_cache_modes, -1, buf); |
cafe5635 KO |
346 | if (v < 0) |
347 | return v; | |
348 | ||
6f10f7d1 | 349 | if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) { |
cafe5635 KO |
350 | SET_BDEV_CACHE_MODE(&dc->sb, v); |
351 | bch_write_bdev_super(dc, NULL); | |
352 | } | |
353 | } | |
354 | ||
7e027ca4 | 355 | if (attr == &sysfs_stop_when_cache_set_failed) { |
20621fed | 356 | v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); |
7e027ca4 CL |
357 | if (v < 0) |
358 | return v; | |
359 | ||
360 | dc->stop_when_cache_set_failed = v; | |
361 | } | |
362 | ||
cafe5635 | 363 | if (attr == &sysfs_label) { |
aee6f1cf GP |
364 | if (size > SB_LABEL_SIZE) |
365 | return -EINVAL; | |
366 | memcpy(dc->sb.label, buf, size); | |
367 | if (size < SB_LABEL_SIZE) | |
368 | dc->sb.label[size] = '\0'; | |
369 | if (size && dc->sb.label[size - 1] == '\n') | |
370 | dc->sb.label[size - 1] = '\0'; | |
cafe5635 KO |
371 | bch_write_bdev_super(dc, NULL); |
372 | if (dc->disk.c) { | |
373 | memcpy(dc->disk.c->uuids[dc->disk.id].label, | |
374 | buf, SB_LABEL_SIZE); | |
375 | bch_uuid_write(dc->disk.c); | |
376 | } | |
ab9e1400 | 377 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
d2a65ce2 DC |
378 | if (!env) |
379 | return -ENOMEM; | |
ab9e1400 GP |
380 | add_uevent_var(env, "DRIVER=bcache"); |
381 | add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), | |
382 | add_uevent_var(env, "CACHED_LABEL=%s", buf); | |
b0d30981 CL |
383 | kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj, |
384 | KOBJ_CHANGE, | |
385 | env->envp); | |
ab9e1400 | 386 | kfree(env); |
cafe5635 KO |
387 | } |
388 | ||
389 | if (attr == &sysfs_attach) { | |
73ac105b TJ |
390 | uint8_t set_uuid[16]; |
391 | ||
392 | if (bch_parse_uuid(buf, set_uuid) < 16) | |
cafe5635 KO |
393 | return -EINVAL; |
394 | ||
7f4fc93d | 395 | v = -ENOENT; |
cafe5635 | 396 | list_for_each_entry(c, &bch_cache_sets, list) { |
73ac105b | 397 | v = bch_cached_dev_attach(dc, c, set_uuid); |
cafe5635 KO |
398 | if (!v) |
399 | return size; | |
400 | } | |
e921efeb SW |
401 | if (v == -ENOENT) |
402 | pr_err("Can't attach %s: cache set not found", buf); | |
7f4fc93d | 403 | return v; |
cafe5635 KO |
404 | } |
405 | ||
406 | if (attr == &sysfs_detach && dc->disk.c) | |
407 | bch_cached_dev_detach(dc); | |
408 | ||
409 | if (attr == &sysfs_stop) | |
410 | bcache_device_stop(&dc->disk); | |
411 | ||
412 | return size; | |
413 | } | |
414 | ||
415 | STORE(bch_cached_dev) | |
416 | { | |
417 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
418 | disk.kobj); | |
419 | ||
a59ff6cc CL |
420 | /* no user space access if system is rebooting */ |
421 | if (bcache_is_reboot) | |
422 | return -EBUSY; | |
423 | ||
cafe5635 KO |
424 | mutex_lock(&bch_register_lock); |
425 | size = __cached_dev_store(kobj, attr, buf, size); | |
426 | ||
f383ae30 SW |
427 | if (attr == &sysfs_writeback_running) { |
428 | /* dc->writeback_running changed in __cached_dev_store() */ | |
429 | if (IS_ERR_OR_NULL(dc->writeback_thread)) { | |
430 | /* | |
431 | * reject setting it to 1 via sysfs if writeback | |
432 | * kthread is not created yet. | |
433 | */ | |
434 | if (dc->writeback_running) { | |
435 | dc->writeback_running = false; | |
436 | pr_err("%s: failed to run non-existent writeback thread", | |
437 | dc->disk.disk->disk_name); | |
438 | } | |
439 | } else | |
440 | /* | |
441 | * writeback kthread will check if dc->writeback_running | |
442 | * is true or false. | |
443 | */ | |
444 | bch_writeback_queue(dc); | |
445 | } | |
cafe5635 | 446 | |
1f0ffa67 CL |
447 | /* |
448 | * Only set BCACHE_DEV_WB_RUNNING when cached device attached to | |
449 | * a cache set, otherwise it doesn't make sense. | |
450 | */ | |
cafe5635 | 451 | if (attr == &sysfs_writeback_percent) |
1f0ffa67 CL |
452 | if ((dc->disk.c != NULL) && |
453 | (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))) | |
3fd47bfe | 454 | schedule_delayed_work(&dc->writeback_rate_update, |
cafe5635 KO |
455 | dc->writeback_rate_update_seconds * HZ); |
456 | ||
457 | mutex_unlock(&bch_register_lock); | |
458 | return size; | |
459 | } | |
460 | ||
461 | static struct attribute *bch_cached_dev_files[] = { | |
462 | &sysfs_attach, | |
463 | &sysfs_detach, | |
464 | &sysfs_stop, | |
465 | #if 0 | |
466 | &sysfs_data_csum, | |
467 | #endif | |
468 | &sysfs_cache_mode, | |
7e027ca4 | 469 | &sysfs_stop_when_cache_set_failed, |
cafe5635 KO |
470 | &sysfs_writeback_metadata, |
471 | &sysfs_writeback_running, | |
472 | &sysfs_writeback_delay, | |
473 | &sysfs_writeback_percent, | |
474 | &sysfs_writeback_rate, | |
475 | &sysfs_writeback_rate_update_seconds, | |
1d316e65 | 476 | &sysfs_writeback_rate_i_term_inverse, |
cafe5635 | 477 | &sysfs_writeback_rate_p_term_inverse, |
7567c2a2 | 478 | &sysfs_writeback_rate_minimum, |
cafe5635 | 479 | &sysfs_writeback_rate_debug, |
54619998 | 480 | &sysfs_io_errors, |
c7b7bd07 CL |
481 | &sysfs_io_error_limit, |
482 | &sysfs_io_disable, | |
cafe5635 | 483 | &sysfs_dirty_data, |
72c27061 KO |
484 | &sysfs_stripe_size, |
485 | &sysfs_partial_stripes_expensive, | |
cafe5635 | 486 | &sysfs_sequential_cutoff, |
cafe5635 KO |
487 | &sysfs_clear_stats, |
488 | &sysfs_running, | |
489 | &sysfs_state, | |
490 | &sysfs_label, | |
491 | &sysfs_readahead, | |
492 | #ifdef CONFIG_BCACHE_DEBUG | |
493 | &sysfs_verify, | |
5ceaaad7 | 494 | &sysfs_bypass_torture_test, |
cafe5635 | 495 | #endif |
926d1946 | 496 | &sysfs_backing_dev_name, |
d4610456 | 497 | &sysfs_backing_dev_uuid, |
cafe5635 KO |
498 | NULL |
499 | }; | |
500 | KTYPE(bch_cached_dev); | |
501 | ||
502 | SHOW(bch_flash_dev) | |
503 | { | |
504 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
505 | kobj); | |
506 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
507 | ||
508 | sysfs_printf(data_csum, "%i", d->data_csum); | |
509 | sysfs_hprint(size, u->sectors << 9); | |
510 | ||
511 | if (attr == &sysfs_label) { | |
512 | memcpy(buf, u->label, SB_LABEL_SIZE); | |
513 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
514 | strcat(buf, "\n"); | |
515 | return strlen(buf); | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | STORE(__bch_flash_dev) | |
522 | { | |
523 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
524 | kobj); | |
525 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
526 | ||
a59ff6cc CL |
527 | /* no user space access if system is rebooting */ |
528 | if (bcache_is_reboot) | |
529 | return -EBUSY; | |
530 | ||
cafe5635 KO |
531 | sysfs_strtoul(data_csum, d->data_csum); |
532 | ||
533 | if (attr == &sysfs_size) { | |
534 | uint64_t v; | |
1fae7cf0 | 535 | |
cafe5635 KO |
536 | strtoi_h_or_return(buf, v); |
537 | ||
538 | u->sectors = v >> 9; | |
539 | bch_uuid_write(d->c); | |
540 | set_capacity(d->disk, u->sectors); | |
541 | } | |
542 | ||
543 | if (attr == &sysfs_label) { | |
544 | memcpy(u->label, buf, SB_LABEL_SIZE); | |
545 | bch_uuid_write(d->c); | |
546 | } | |
547 | ||
548 | if (attr == &sysfs_unregister) { | |
c4d951dd | 549 | set_bit(BCACHE_DEV_DETACHING, &d->flags); |
cafe5635 KO |
550 | bcache_device_stop(d); |
551 | } | |
552 | ||
553 | return size; | |
554 | } | |
555 | STORE_LOCKED(bch_flash_dev) | |
556 | ||
557 | static struct attribute *bch_flash_dev_files[] = { | |
558 | &sysfs_unregister, | |
559 | #if 0 | |
560 | &sysfs_data_csum, | |
561 | #endif | |
562 | &sysfs_label, | |
563 | &sysfs_size, | |
564 | NULL | |
565 | }; | |
566 | KTYPE(bch_flash_dev); | |
567 | ||
f67342dd KO |
568 | struct bset_stats_op { |
569 | struct btree_op op; | |
570 | size_t nodes; | |
571 | struct bset_stats stats; | |
572 | }; | |
573 | ||
cb851149 | 574 | static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) |
f67342dd KO |
575 | { |
576 | struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); | |
577 | ||
578 | op->nodes++; | |
579 | bch_btree_keys_stats(&b->keys, &op->stats); | |
580 | ||
581 | return MAP_CONTINUE; | |
582 | } | |
583 | ||
3572324a | 584 | static int bch_bset_print_stats(struct cache_set *c, char *buf) |
f67342dd KO |
585 | { |
586 | struct bset_stats_op op; | |
587 | int ret; | |
588 | ||
589 | memset(&op, 0, sizeof(op)); | |
590 | bch_btree_op_init(&op.op, -1); | |
591 | ||
cb851149 | 592 | ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); |
f67342dd KO |
593 | if (ret < 0) |
594 | return ret; | |
595 | ||
596 | return snprintf(buf, PAGE_SIZE, | |
597 | "btree nodes: %zu\n" | |
598 | "written sets: %zu\n" | |
599 | "unwritten sets: %zu\n" | |
600 | "written key bytes: %zu\n" | |
601 | "unwritten key bytes: %zu\n" | |
602 | "floats: %zu\n" | |
603 | "failed: %zu\n", | |
604 | op.nodes, | |
605 | op.stats.sets_written, op.stats.sets_unwritten, | |
606 | op.stats.bytes_written, op.stats.bytes_unwritten, | |
607 | op.stats.floats, op.stats.failed); | |
608 | } | |
609 | ||
6f10f7d1 | 610 | static unsigned int bch_root_usage(struct cache_set *c) |
cafe5635 | 611 | { |
6f10f7d1 | 612 | unsigned int bytes = 0; |
cb851149 JS |
613 | struct bkey *k; |
614 | struct btree *b; | |
615 | struct btree_iter iter; | |
cafe5635 | 616 | |
cb851149 | 617 | goto lock_root; |
cafe5635 | 618 | |
cb851149 JS |
619 | do { |
620 | rw_unlock(false, b); | |
cafe5635 | 621 | lock_root: |
cb851149 JS |
622 | b = c->root; |
623 | rw_lock(false, b, b->level); | |
624 | } while (b != c->root); | |
cafe5635 | 625 | |
cb851149 JS |
626 | for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) |
627 | bytes += bkey_bytes(k); | |
cafe5635 | 628 | |
cb851149 | 629 | rw_unlock(false, b); |
cafe5635 | 630 | |
cb851149 JS |
631 | return (bytes * 100) / btree_bytes(c); |
632 | } | |
cafe5635 | 633 | |
cb851149 JS |
634 | static size_t bch_cache_size(struct cache_set *c) |
635 | { | |
636 | size_t ret = 0; | |
637 | struct btree *b; | |
cafe5635 | 638 | |
cb851149 JS |
639 | mutex_lock(&c->bucket_lock); |
640 | list_for_each_entry(b, &c->btree_cache, list) | |
641 | ret += 1 << (b->keys.page_order + PAGE_SHIFT); | |
cafe5635 | 642 | |
cb851149 JS |
643 | mutex_unlock(&c->bucket_lock); |
644 | return ret; | |
645 | } | |
cafe5635 | 646 | |
6f10f7d1 | 647 | static unsigned int bch_cache_max_chain(struct cache_set *c) |
cb851149 | 648 | { |
6f10f7d1 | 649 | unsigned int ret = 0; |
cb851149 | 650 | struct hlist_head *h; |
cafe5635 | 651 | |
cb851149 | 652 | mutex_lock(&c->bucket_lock); |
cafe5635 | 653 | |
cb851149 JS |
654 | for (h = c->bucket_hash; |
655 | h < c->bucket_hash + (1 << BUCKET_HASH_BITS); | |
656 | h++) { | |
6f10f7d1 | 657 | unsigned int i = 0; |
cb851149 | 658 | struct hlist_node *p; |
cafe5635 | 659 | |
cb851149 JS |
660 | hlist_for_each(p, h) |
661 | i++; | |
cafe5635 | 662 | |
cb851149 | 663 | ret = max(ret, i); |
cafe5635 KO |
664 | } |
665 | ||
cb851149 JS |
666 | mutex_unlock(&c->bucket_lock); |
667 | return ret; | |
668 | } | |
cafe5635 | 669 | |
6f10f7d1 | 670 | static unsigned int bch_btree_used(struct cache_set *c) |
cb851149 JS |
671 | { |
672 | return div64_u64(c->gc_stats.key_bytes * 100, | |
673 | (c->gc_stats.nodes ?: 1) * btree_bytes(c)); | |
674 | } | |
cafe5635 | 675 | |
6f10f7d1 | 676 | static unsigned int bch_average_key_size(struct cache_set *c) |
cb851149 JS |
677 | { |
678 | return c->gc_stats.nkeys | |
679 | ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) | |
680 | : 0; | |
681 | } | |
682 | ||
683 | SHOW(__bch_cache_set) | |
684 | { | |
cafe5635 KO |
685 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); |
686 | ||
687 | sysfs_print(synchronous, CACHE_SYNC(&c->sb)); | |
688 | sysfs_print(journal_delay_ms, c->journal_delay_ms); | |
689 | sysfs_hprint(bucket_size, bucket_bytes(c)); | |
690 | sysfs_hprint(block_size, block_bytes(c)); | |
691 | sysfs_print(tree_depth, c->root->level); | |
cb851149 | 692 | sysfs_print(root_usage_percent, bch_root_usage(c)); |
cafe5635 | 693 | |
cb851149 JS |
694 | sysfs_hprint(btree_cache_size, bch_cache_size(c)); |
695 | sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); | |
cafe5635 KO |
696 | sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); |
697 | ||
698 | sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); | |
699 | sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); | |
67539e85 | 700 | sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); |
cafe5635 | 701 | sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); |
cafe5635 | 702 | |
cb851149 | 703 | sysfs_print(btree_used_percent, bch_btree_used(c)); |
cafe5635 | 704 | sysfs_print(btree_nodes, c->gc_stats.nodes); |
cb851149 | 705 | sysfs_hprint(average_key_size, bch_average_key_size(c)); |
cafe5635 KO |
706 | |
707 | sysfs_print(cache_read_races, | |
708 | atomic_long_read(&c->cache_read_races)); | |
709 | ||
a728eacb TJ |
710 | sysfs_print(reclaim, |
711 | atomic_long_read(&c->reclaim)); | |
712 | ||
dff90d58 CL |
713 | sysfs_print(reclaimed_journal_buckets, |
714 | atomic_long_read(&c->reclaimed_journal_buckets)); | |
715 | ||
a728eacb TJ |
716 | sysfs_print(flush_write, |
717 | atomic_long_read(&c->flush_write)); | |
718 | ||
cafe5635 KO |
719 | sysfs_print(writeback_keys_done, |
720 | atomic_long_read(&c->writeback_keys_done)); | |
721 | sysfs_print(writeback_keys_failed, | |
722 | atomic_long_read(&c->writeback_keys_failed)); | |
723 | ||
77c320eb KO |
724 | if (attr == &sysfs_errors) |
725 | return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, | |
726 | c->on_error); | |
727 | ||
cafe5635 KO |
728 | /* See count_io_errors for why 88 */ |
729 | sysfs_print(io_error_halflife, c->error_decay * 88); | |
7ba0d830 | 730 | sysfs_print(io_error_limit, c->error_limit); |
cafe5635 KO |
731 | |
732 | sysfs_hprint(congested, | |
733 | ((uint64_t) bch_get_congested(c)) << 9); | |
734 | sysfs_print(congested_read_threshold_us, | |
735 | c->congested_read_threshold_us); | |
736 | sysfs_print(congested_write_threshold_us, | |
737 | c->congested_write_threshold_us); | |
738 | ||
9aaf5165 CL |
739 | sysfs_print(cutoff_writeback, bch_cutoff_writeback); |
740 | sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync); | |
741 | ||
cafe5635 KO |
742 | sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); |
743 | sysfs_printf(verify, "%i", c->verify); | |
744 | sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); | |
280481d0 KO |
745 | sysfs_printf(expensive_debug_checks, |
746 | "%i", c->expensive_debug_checks); | |
cafe5635 KO |
747 | sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); |
748 | sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); | |
749 | sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); | |
7a671d8e | 750 | sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback); |
771f393e CL |
751 | sysfs_printf(io_disable, "%i", |
752 | test_bit(CACHE_SET_IO_DISABLE, &c->flags)); | |
cafe5635 KO |
753 | |
754 | if (attr == &sysfs_bset_tree_stats) | |
755 | return bch_bset_print_stats(c, buf); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | SHOW_LOCKED(bch_cache_set) | |
760 | ||
761 | STORE(__bch_cache_set) | |
762 | { | |
763 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
ce4c3e19 | 764 | ssize_t v; |
cafe5635 | 765 | |
a59ff6cc CL |
766 | /* no user space access if system is rebooting */ |
767 | if (bcache_is_reboot) | |
768 | return -EBUSY; | |
769 | ||
cafe5635 KO |
770 | if (attr == &sysfs_unregister) |
771 | bch_cache_set_unregister(c); | |
772 | ||
773 | if (attr == &sysfs_stop) | |
774 | bch_cache_set_stop(c); | |
775 | ||
776 | if (attr == &sysfs_synchronous) { | |
777 | bool sync = strtoul_or_return(buf); | |
778 | ||
779 | if (sync != CACHE_SYNC(&c->sb)) { | |
780 | SET_CACHE_SYNC(&c->sb, sync); | |
781 | bcache_write_super(c); | |
782 | } | |
783 | } | |
784 | ||
785 | if (attr == &sysfs_flash_vol_create) { | |
786 | int r; | |
787 | uint64_t v; | |
1fae7cf0 | 788 | |
cafe5635 KO |
789 | strtoi_h_or_return(buf, v); |
790 | ||
791 | r = bch_flash_dev_create(c, v); | |
792 | if (r) | |
793 | return r; | |
794 | } | |
795 | ||
796 | if (attr == &sysfs_clear_stats) { | |
797 | atomic_long_set(&c->writeback_keys_done, 0); | |
798 | atomic_long_set(&c->writeback_keys_failed, 0); | |
799 | ||
800 | memset(&c->gc_stats, 0, sizeof(struct gc_stat)); | |
801 | bch_cache_accounting_clear(&c->accounting); | |
802 | } | |
803 | ||
cb07ad63 CL |
804 | if (attr == &sysfs_trigger_gc) |
805 | force_wake_up_gc(c); | |
cafe5635 KO |
806 | |
807 | if (attr == &sysfs_prune_cache) { | |
808 | struct shrink_control sc; | |
1fae7cf0 | 809 | |
cafe5635 KO |
810 | sc.gfp_mask = GFP_KERNEL; |
811 | sc.nr_to_scan = strtoul_or_return(buf); | |
7dc19d5a | 812 | c->shrink.scan_objects(&c->shrink, &sc); |
cafe5635 KO |
813 | } |
814 | ||
f54478c6 CL |
815 | sysfs_strtoul_clamp(congested_read_threshold_us, |
816 | c->congested_read_threshold_us, | |
817 | 0, UINT_MAX); | |
818 | sysfs_strtoul_clamp(congested_write_threshold_us, | |
819 | c->congested_write_threshold_us, | |
820 | 0, UINT_MAX); | |
cafe5635 | 821 | |
77c320eb | 822 | if (attr == &sysfs_errors) { |
20621fed | 823 | v = __sysfs_match_string(error_actions, -1, buf); |
77c320eb KO |
824 | if (v < 0) |
825 | return v; | |
826 | ||
827 | c->on_error = v; | |
828 | } | |
829 | ||
b1500840 | 830 | sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX); |
cafe5635 KO |
831 | |
832 | /* See count_io_errors() for why 88 */ | |
a91fbda4 CL |
833 | if (attr == &sysfs_io_error_halflife) { |
834 | unsigned long v = 0; | |
835 | ssize_t ret; | |
836 | ||
837 | ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX); | |
838 | if (!ret) { | |
839 | c->error_decay = v / 88; | |
840 | return size; | |
841 | } | |
842 | return ret; | |
843 | } | |
cafe5635 | 844 | |
771f393e | 845 | if (attr == &sysfs_io_disable) { |
ce4c3e19 | 846 | v = strtoul_or_return(buf); |
771f393e CL |
847 | if (v) { |
848 | if (test_and_set_bit(CACHE_SET_IO_DISABLE, | |
849 | &c->flags)) | |
850 | pr_warn("CACHE_SET_IO_DISABLE already set"); | |
851 | } else { | |
852 | if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, | |
853 | &c->flags)) | |
854 | pr_warn("CACHE_SET_IO_DISABLE already cleared"); | |
855 | } | |
856 | } | |
857 | ||
453745fb CL |
858 | sysfs_strtoul_clamp(journal_delay_ms, |
859 | c->journal_delay_ms, | |
860 | 0, USHRT_MAX); | |
f5c0b95d CL |
861 | sysfs_strtoul_bool(verify, c->verify); |
862 | sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled); | |
280481d0 | 863 | sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); |
f5c0b95d CL |
864 | sysfs_strtoul_bool(gc_always_rewrite, c->gc_always_rewrite); |
865 | sysfs_strtoul_bool(btree_shrinker_disabled, c->shrinker_disabled); | |
866 | sysfs_strtoul_bool(copy_gc_enabled, c->copy_gc_enabled); | |
7a671d8e CL |
867 | /* |
868 | * write gc_after_writeback here may overwrite an already set | |
869 | * BCH_DO_AUTO_GC, it doesn't matter because this flag will be | |
870 | * set in next chance. | |
871 | */ | |
872 | sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1); | |
cafe5635 KO |
873 | |
874 | return size; | |
875 | } | |
876 | STORE_LOCKED(bch_cache_set) | |
877 | ||
878 | SHOW(bch_cache_set_internal) | |
879 | { | |
880 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
1fae7cf0 | 881 | |
cafe5635 KO |
882 | return bch_cache_set_show(&c->kobj, attr, buf); |
883 | } | |
884 | ||
885 | STORE(bch_cache_set_internal) | |
886 | { | |
887 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
1fae7cf0 | 888 | |
a59ff6cc CL |
889 | /* no user space access if system is rebooting */ |
890 | if (bcache_is_reboot) | |
891 | return -EBUSY; | |
892 | ||
cafe5635 KO |
893 | return bch_cache_set_store(&c->kobj, attr, buf, size); |
894 | } | |
895 | ||
896 | static void bch_cache_set_internal_release(struct kobject *k) | |
897 | { | |
898 | } | |
899 | ||
900 | static struct attribute *bch_cache_set_files[] = { | |
901 | &sysfs_unregister, | |
902 | &sysfs_stop, | |
903 | &sysfs_synchronous, | |
904 | &sysfs_journal_delay_ms, | |
905 | &sysfs_flash_vol_create, | |
906 | ||
907 | &sysfs_bucket_size, | |
908 | &sysfs_block_size, | |
909 | &sysfs_tree_depth, | |
910 | &sysfs_root_usage_percent, | |
911 | &sysfs_btree_cache_size, | |
912 | &sysfs_cache_available_percent, | |
913 | ||
914 | &sysfs_average_key_size, | |
cafe5635 | 915 | |
77c320eb | 916 | &sysfs_errors, |
cafe5635 KO |
917 | &sysfs_io_error_limit, |
918 | &sysfs_io_error_halflife, | |
919 | &sysfs_congested, | |
920 | &sysfs_congested_read_threshold_us, | |
921 | &sysfs_congested_write_threshold_us, | |
922 | &sysfs_clear_stats, | |
923 | NULL | |
924 | }; | |
925 | KTYPE(bch_cache_set); | |
926 | ||
927 | static struct attribute *bch_cache_set_internal_files[] = { | |
928 | &sysfs_active_journal_entries, | |
929 | ||
930 | sysfs_time_stats_attribute_list(btree_gc, sec, ms) | |
931 | sysfs_time_stats_attribute_list(btree_split, sec, us) | |
932 | sysfs_time_stats_attribute_list(btree_sort, ms, us) | |
933 | sysfs_time_stats_attribute_list(btree_read, ms, us) | |
cafe5635 KO |
934 | |
935 | &sysfs_btree_nodes, | |
936 | &sysfs_btree_used_percent, | |
937 | &sysfs_btree_cache_max_chain, | |
938 | ||
939 | &sysfs_bset_tree_stats, | |
940 | &sysfs_cache_read_races, | |
a728eacb | 941 | &sysfs_reclaim, |
dff90d58 | 942 | &sysfs_reclaimed_journal_buckets, |
a728eacb | 943 | &sysfs_flush_write, |
cafe5635 KO |
944 | &sysfs_writeback_keys_done, |
945 | &sysfs_writeback_keys_failed, | |
946 | ||
947 | &sysfs_trigger_gc, | |
948 | &sysfs_prune_cache, | |
949 | #ifdef CONFIG_BCACHE_DEBUG | |
950 | &sysfs_verify, | |
951 | &sysfs_key_merging_disabled, | |
280481d0 | 952 | &sysfs_expensive_debug_checks, |
cafe5635 KO |
953 | #endif |
954 | &sysfs_gc_always_rewrite, | |
955 | &sysfs_btree_shrinker_disabled, | |
956 | &sysfs_copy_gc_enabled, | |
7a671d8e | 957 | &sysfs_gc_after_writeback, |
771f393e | 958 | &sysfs_io_disable, |
9aaf5165 CL |
959 | &sysfs_cutoff_writeback, |
960 | &sysfs_cutoff_writeback_sync, | |
cafe5635 KO |
961 | NULL |
962 | }; | |
963 | KTYPE(bch_cache_set_internal); | |
964 | ||
58f913dc PF |
965 | static int __bch_cache_cmp(const void *l, const void *r) |
966 | { | |
967 | return *((uint16_t *)r) - *((uint16_t *)l); | |
968 | } | |
969 | ||
cafe5635 KO |
970 | SHOW(__bch_cache) |
971 | { | |
972 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
973 | ||
974 | sysfs_hprint(bucket_size, bucket_bytes(ca)); | |
975 | sysfs_hprint(block_size, block_bytes(ca)); | |
976 | sysfs_print(nbuckets, ca->sb.nbuckets); | |
977 | sysfs_print(discard, ca->discard); | |
978 | sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); | |
979 | sysfs_hprint(btree_written, | |
980 | atomic_long_read(&ca->btree_sectors_written) << 9); | |
981 | sysfs_hprint(metadata_written, | |
982 | (atomic_long_read(&ca->meta_sectors_written) + | |
983 | atomic_long_read(&ca->btree_sectors_written)) << 9); | |
984 | ||
985 | sysfs_print(io_errors, | |
986 | atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); | |
987 | ||
cafe5635 | 988 | if (attr == &sysfs_cache_replacement_policy) |
169ef1cf KO |
989 | return bch_snprint_string_list(buf, PAGE_SIZE, |
990 | cache_replacement_policies, | |
991 | CACHE_REPLACEMENT(&ca->sb)); | |
cafe5635 KO |
992 | |
993 | if (attr == &sysfs_priority_stats) { | |
15754020 KO |
994 | struct bucket *b; |
995 | size_t n = ca->sb.nbuckets, i; | |
996 | size_t unused = 0, available = 0, dirty = 0, meta = 0; | |
cafe5635 | 997 | uint64_t sum = 0; |
bbc77aa7 KO |
998 | /* Compute 31 quantiles */ |
999 | uint16_t q[31], *p, *cached; | |
cafe5635 KO |
1000 | ssize_t ret; |
1001 | ||
42bc47b3 KC |
1002 | cached = p = vmalloc(array_size(sizeof(uint16_t), |
1003 | ca->sb.nbuckets)); | |
cafe5635 KO |
1004 | if (!p) |
1005 | return -ENOMEM; | |
1006 | ||
1007 | mutex_lock(&ca->set->bucket_lock); | |
15754020 KO |
1008 | for_each_bucket(b, ca) { |
1009 | if (!GC_SECTORS_USED(b)) | |
1010 | unused++; | |
1011 | if (GC_MARK(b) == GC_MARK_RECLAIMABLE) | |
1012 | available++; | |
1013 | if (GC_MARK(b) == GC_MARK_DIRTY) | |
1014 | dirty++; | |
1015 | if (GC_MARK(b) == GC_MARK_METADATA) | |
1016 | meta++; | |
1017 | } | |
1018 | ||
cafe5635 KO |
1019 | for (i = ca->sb.first_bucket; i < n; i++) |
1020 | p[i] = ca->buckets[i].prio; | |
1021 | mutex_unlock(&ca->set->bucket_lock); | |
1022 | ||
58f913dc | 1023 | sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); |
cafe5635 KO |
1024 | |
1025 | while (n && | |
1026 | !cached[n - 1]) | |
1027 | --n; | |
1028 | ||
cafe5635 KO |
1029 | while (cached < p + n && |
1030 | *cached == BTREE_PRIO) | |
15754020 | 1031 | cached++, n--; |
cafe5635 KO |
1032 | |
1033 | for (i = 0; i < n; i++) | |
1034 | sum += INITIAL_PRIO - cached[i]; | |
1035 | ||
1036 | if (n) | |
1037 | do_div(sum, n); | |
1038 | ||
bbc77aa7 KO |
1039 | for (i = 0; i < ARRAY_SIZE(q); i++) |
1040 | q[i] = INITIAL_PRIO - cached[n * (i + 1) / | |
1041 | (ARRAY_SIZE(q) + 1)]; | |
cafe5635 KO |
1042 | |
1043 | vfree(p); | |
1044 | ||
bbc77aa7 KO |
1045 | ret = scnprintf(buf, PAGE_SIZE, |
1046 | "Unused: %zu%%\n" | |
15754020 KO |
1047 | "Clean: %zu%%\n" |
1048 | "Dirty: %zu%%\n" | |
bbc77aa7 KO |
1049 | "Metadata: %zu%%\n" |
1050 | "Average: %llu\n" | |
1051 | "Sectors per Q: %zu\n" | |
1052 | "Quantiles: [", | |
1053 | unused * 100 / (size_t) ca->sb.nbuckets, | |
15754020 KO |
1054 | available * 100 / (size_t) ca->sb.nbuckets, |
1055 | dirty * 100 / (size_t) ca->sb.nbuckets, | |
1056 | meta * 100 / (size_t) ca->sb.nbuckets, sum, | |
bbc77aa7 KO |
1057 | n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); |
1058 | ||
1059 | for (i = 0; i < ARRAY_SIZE(q); i++) | |
1060 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, | |
1061 | "%u ", q[i]); | |
1062 | ret--; | |
1063 | ||
1064 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); | |
1065 | ||
cafe5635 KO |
1066 | return ret; |
1067 | } | |
1068 | ||
1069 | return 0; | |
1070 | } | |
1071 | SHOW_LOCKED(bch_cache) | |
1072 | ||
1073 | STORE(__bch_cache) | |
1074 | { | |
1075 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
ce4c3e19 | 1076 | ssize_t v; |
cafe5635 | 1077 | |
a59ff6cc CL |
1078 | /* no user space access if system is rebooting */ |
1079 | if (bcache_is_reboot) | |
1080 | return -EBUSY; | |
1081 | ||
cafe5635 KO |
1082 | if (attr == &sysfs_discard) { |
1083 | bool v = strtoul_or_return(buf); | |
1084 | ||
1085 | if (blk_queue_discard(bdev_get_queue(ca->bdev))) | |
1086 | ca->discard = v; | |
1087 | ||
1088 | if (v != CACHE_DISCARD(&ca->sb)) { | |
1089 | SET_CACHE_DISCARD(&ca->sb, v); | |
1090 | bcache_write_super(ca->set); | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | if (attr == &sysfs_cache_replacement_policy) { | |
20621fed | 1095 | v = __sysfs_match_string(cache_replacement_policies, -1, buf); |
cafe5635 KO |
1096 | if (v < 0) |
1097 | return v; | |
1098 | ||
6f10f7d1 | 1099 | if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) { |
cafe5635 KO |
1100 | mutex_lock(&ca->set->bucket_lock); |
1101 | SET_CACHE_REPLACEMENT(&ca->sb, v); | |
1102 | mutex_unlock(&ca->set->bucket_lock); | |
1103 | ||
1104 | bcache_write_super(ca->set); | |
1105 | } | |
1106 | } | |
1107 | ||
cafe5635 KO |
1108 | if (attr == &sysfs_clear_stats) { |
1109 | atomic_long_set(&ca->sectors_written, 0); | |
1110 | atomic_long_set(&ca->btree_sectors_written, 0); | |
1111 | atomic_long_set(&ca->meta_sectors_written, 0); | |
1112 | atomic_set(&ca->io_count, 0); | |
1113 | atomic_set(&ca->io_errors, 0); | |
1114 | } | |
1115 | ||
1116 | return size; | |
1117 | } | |
1118 | STORE_LOCKED(bch_cache) | |
1119 | ||
1120 | static struct attribute *bch_cache_files[] = { | |
1121 | &sysfs_bucket_size, | |
1122 | &sysfs_block_size, | |
1123 | &sysfs_nbuckets, | |
1124 | &sysfs_priority_stats, | |
1125 | &sysfs_discard, | |
1126 | &sysfs_written, | |
1127 | &sysfs_btree_written, | |
1128 | &sysfs_metadata_written, | |
1129 | &sysfs_io_errors, | |
1130 | &sysfs_clear_stats, | |
cafe5635 KO |
1131 | &sysfs_cache_replacement_policy, |
1132 | NULL | |
1133 | }; | |
1134 | KTYPE(bch_cache); |