1 // SPDX-License-Identifier: GPL-2.0
3 * bcache sysfs interfaces
5 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
6 * Copyright 2012 Google, Inc.
13 #include "writeback.h"
16 #include <linux/blkdev.h>
17 #include <linux/sort.h>
18 #include <linux/sched/clock.h>
20 extern bool bcache_is_reboot
;
22 /* Default is 0 ("writethrough") */
23 static const char * const bch_cache_modes
[] = {
31 static const char * const bch_reada_cache_policies
[] = {
37 /* Default is 0 ("auto") */
38 static const char * const bch_stop_on_failure_modes
[] = {
44 static const char * const cache_replacement_policies
[] = {
51 static const char * const error_actions
[] = {
57 write_attribute(attach
);
58 write_attribute(detach
);
59 write_attribute(unregister
);
60 write_attribute(stop
);
61 write_attribute(clear_stats
);
62 write_attribute(trigger_gc
);
63 write_attribute(prune_cache
);
64 write_attribute(flash_vol_create
);
66 read_attribute(bucket_size
);
67 read_attribute(block_size
);
68 read_attribute(nbuckets
);
69 read_attribute(tree_depth
);
70 read_attribute(root_usage_percent
);
71 read_attribute(priority_stats
);
72 read_attribute(btree_cache_size
);
73 read_attribute(btree_cache_max_chain
);
74 read_attribute(cache_available_percent
);
75 read_attribute(written
);
76 read_attribute(btree_written
);
77 read_attribute(metadata_written
);
78 read_attribute(active_journal_entries
);
79 read_attribute(backing_dev_name
);
80 read_attribute(backing_dev_uuid
);
82 sysfs_time_stats_attribute(btree_gc
, sec
, ms
);
83 sysfs_time_stats_attribute(btree_split
, sec
, us
);
84 sysfs_time_stats_attribute(btree_sort
, ms
, us
);
85 sysfs_time_stats_attribute(btree_read
, ms
, us
);
87 read_attribute(btree_nodes
);
88 read_attribute(btree_used_percent
);
89 read_attribute(average_key_size
);
90 read_attribute(dirty_data
);
91 read_attribute(bset_tree_stats
);
92 read_attribute(feature_compat
);
93 read_attribute(feature_ro_compat
);
94 read_attribute(feature_incompat
);
96 read_attribute(state
);
97 read_attribute(cache_read_races
);
98 read_attribute(reclaim
);
99 read_attribute(reclaimed_journal_buckets
);
100 read_attribute(flush_write
);
101 read_attribute(writeback_keys_done
);
102 read_attribute(writeback_keys_failed
);
103 read_attribute(io_errors
);
104 read_attribute(congested
);
105 read_attribute(cutoff_writeback
);
106 read_attribute(cutoff_writeback_sync
);
107 rw_attribute(congested_read_threshold_us
);
108 rw_attribute(congested_write_threshold_us
);
110 rw_attribute(sequential_cutoff
);
111 rw_attribute(data_csum
);
112 rw_attribute(cache_mode
);
113 rw_attribute(readahead_cache_policy
);
114 rw_attribute(stop_when_cache_set_failed
);
115 rw_attribute(writeback_metadata
);
116 rw_attribute(writeback_running
);
117 rw_attribute(writeback_percent
);
118 rw_attribute(writeback_delay
);
119 rw_attribute(writeback_rate
);
120 rw_attribute(writeback_consider_fragment
);
122 rw_attribute(writeback_rate_update_seconds
);
123 rw_attribute(writeback_rate_i_term_inverse
);
124 rw_attribute(writeback_rate_p_term_inverse
);
125 rw_attribute(writeback_rate_fp_term_low
);
126 rw_attribute(writeback_rate_fp_term_mid
);
127 rw_attribute(writeback_rate_fp_term_high
);
128 rw_attribute(writeback_rate_minimum
);
129 read_attribute(writeback_rate_debug
);
131 read_attribute(stripe_size
);
132 read_attribute(partial_stripes_expensive
);
134 rw_attribute(synchronous
);
135 rw_attribute(journal_delay_ms
);
136 rw_attribute(io_disable
);
137 rw_attribute(discard
);
138 rw_attribute(running
);
140 rw_attribute(readahead
);
141 rw_attribute(errors
);
142 rw_attribute(io_error_limit
);
143 rw_attribute(io_error_halflife
);
144 rw_attribute(verify
);
145 rw_attribute(bypass_torture_test
);
146 rw_attribute(key_merging_disabled
);
147 rw_attribute(gc_always_rewrite
);
148 rw_attribute(expensive_debug_checks
);
149 rw_attribute(cache_replacement_policy
);
150 rw_attribute(btree_shrinker_disabled
);
151 rw_attribute(copy_gc_enabled
);
152 rw_attribute(idle_max_writeback_rate
);
153 rw_attribute(gc_after_writeback
);
156 static ssize_t
bch_snprint_string_list(char *buf
,
158 const char * const list
[],
164 for (i
= 0; list
[i
]; i
++)
165 out
+= scnprintf(out
, buf
+ size
- out
,
166 i
== selected
? "[%s] " : "%s ", list
[i
]);
172 SHOW(__bch_cached_dev
)
174 struct cached_dev
*dc
= container_of(kobj
, struct cached_dev
,
176 char const *states
[] = { "no cache", "clean", "dirty", "inconsistent" };
177 int wb
= dc
->writeback_running
;
179 #define var(stat) (dc->stat)
181 if (attr
== &sysfs_cache_mode
)
182 return bch_snprint_string_list(buf
, PAGE_SIZE
,
184 BDEV_CACHE_MODE(&dc
->sb
));
186 if (attr
== &sysfs_readahead_cache_policy
)
187 return bch_snprint_string_list(buf
, PAGE_SIZE
,
188 bch_reada_cache_policies
,
189 dc
->cache_readahead_policy
);
191 if (attr
== &sysfs_stop_when_cache_set_failed
)
192 return bch_snprint_string_list(buf
, PAGE_SIZE
,
193 bch_stop_on_failure_modes
,
194 dc
->stop_when_cache_set_failed
);
197 sysfs_printf(data_csum
, "%i", dc
->disk
.data_csum
);
198 var_printf(verify
, "%i");
199 var_printf(bypass_torture_test
, "%i");
200 var_printf(writeback_metadata
, "%i");
201 var_printf(writeback_running
, "%i");
202 var_printf(writeback_consider_fragment
, "%i");
203 var_print(writeback_delay
);
204 var_print(writeback_percent
);
205 sysfs_hprint(writeback_rate
,
206 wb
? atomic_long_read(&dc
->writeback_rate
.rate
) << 9 : 0);
207 sysfs_printf(io_errors
, "%i", atomic_read(&dc
->io_errors
));
208 sysfs_printf(io_error_limit
, "%i", dc
->error_limit
);
209 sysfs_printf(io_disable
, "%i", dc
->io_disable
);
210 var_print(writeback_rate_update_seconds
);
211 var_print(writeback_rate_i_term_inverse
);
212 var_print(writeback_rate_p_term_inverse
);
213 var_print(writeback_rate_fp_term_low
);
214 var_print(writeback_rate_fp_term_mid
);
215 var_print(writeback_rate_fp_term_high
);
216 var_print(writeback_rate_minimum
);
218 if (attr
== &sysfs_writeback_rate_debug
) {
222 char proportional
[20];
228 * Except for dirty and target, other values should
229 * be 0 if writeback is not running.
232 wb
? atomic_long_read(&dc
->writeback_rate
.rate
) << 9
234 bch_hprint(dirty
, bcache_dev_sectors_dirty(&dc
->disk
) << 9);
235 bch_hprint(target
, dc
->writeback_rate_target
<< 9);
236 bch_hprint(proportional
,
237 wb
? dc
->writeback_rate_proportional
<< 9 : 0);
239 wb
? dc
->writeback_rate_integral_scaled
<< 9 : 0);
240 bch_hprint(change
, wb
? dc
->writeback_rate_change
<< 9 : 0);
241 next_io
= wb
? div64_s64(dc
->writeback_rate
.next
-local_clock(),
248 "proportional:\t%s\n"
250 "change:\t\t%s/sec\n"
251 "next io:\t%llims\n",
252 rate
, dirty
, target
, proportional
,
253 integral
, change
, next_io
);
256 sysfs_hprint(dirty_data
,
257 bcache_dev_sectors_dirty(&dc
->disk
) << 9);
259 sysfs_hprint(stripe_size
, ((uint64_t)dc
->disk
.stripe_size
) << 9);
260 var_printf(partial_stripes_expensive
, "%u");
262 var_hprint(sequential_cutoff
);
263 var_hprint(readahead
);
265 sysfs_print(running
, atomic_read(&dc
->running
));
266 sysfs_print(state
, states
[BDEV_STATE(&dc
->sb
)]);
268 if (attr
== &sysfs_label
) {
269 memcpy(buf
, dc
->sb
.label
, SB_LABEL_SIZE
);
270 buf
[SB_LABEL_SIZE
+ 1] = '\0';
275 if (attr
== &sysfs_backing_dev_name
) {
276 snprintf(buf
, BDEVNAME_SIZE
+ 1, "%s", dc
->backing_dev_name
);
281 if (attr
== &sysfs_backing_dev_uuid
) {
282 /* convert binary uuid into 36-byte string plus '\0' */
283 snprintf(buf
, 36+1, "%pU", dc
->sb
.uuid
);
291 SHOW_LOCKED(bch_cached_dev
)
295 struct cached_dev
*dc
= container_of(kobj
, struct cached_dev
,
299 struct kobj_uevent_env
*env
;
301 /* no user space access if system is rebooting */
302 if (bcache_is_reboot
)
305 #define d_strtoul(var) sysfs_strtoul(var, dc->var)
306 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
307 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
309 sysfs_strtoul(data_csum
, dc
->disk
.data_csum
);
311 sysfs_strtoul_bool(bypass_torture_test
, dc
->bypass_torture_test
);
312 sysfs_strtoul_bool(writeback_metadata
, dc
->writeback_metadata
);
313 sysfs_strtoul_bool(writeback_running
, dc
->writeback_running
);
314 sysfs_strtoul_bool(writeback_consider_fragment
, dc
->writeback_consider_fragment
);
315 sysfs_strtoul_clamp(writeback_delay
, dc
->writeback_delay
, 0, UINT_MAX
);
317 sysfs_strtoul_clamp(writeback_percent
, dc
->writeback_percent
,
318 0, bch_cutoff_writeback
);
320 if (attr
== &sysfs_writeback_rate
) {
322 long int v
= atomic_long_read(&dc
->writeback_rate
.rate
);
324 ret
= strtoul_safe_clamp(buf
, v
, 1, INT_MAX
);
327 atomic_long_set(&dc
->writeback_rate
.rate
, v
);
334 sysfs_strtoul_clamp(writeback_rate_update_seconds
,
335 dc
->writeback_rate_update_seconds
,
336 1, WRITEBACK_RATE_UPDATE_SECS_MAX
);
337 sysfs_strtoul_clamp(writeback_rate_i_term_inverse
,
338 dc
->writeback_rate_i_term_inverse
,
340 sysfs_strtoul_clamp(writeback_rate_p_term_inverse
,
341 dc
->writeback_rate_p_term_inverse
,
343 sysfs_strtoul_clamp(writeback_rate_fp_term_low
,
344 dc
->writeback_rate_fp_term_low
,
345 1, dc
->writeback_rate_fp_term_mid
- 1);
346 sysfs_strtoul_clamp(writeback_rate_fp_term_mid
,
347 dc
->writeback_rate_fp_term_mid
,
348 dc
->writeback_rate_fp_term_low
+ 1,
349 dc
->writeback_rate_fp_term_high
- 1);
350 sysfs_strtoul_clamp(writeback_rate_fp_term_high
,
351 dc
->writeback_rate_fp_term_high
,
352 dc
->writeback_rate_fp_term_mid
+ 1, UINT_MAX
);
353 sysfs_strtoul_clamp(writeback_rate_minimum
,
354 dc
->writeback_rate_minimum
,
357 sysfs_strtoul_clamp(io_error_limit
, dc
->error_limit
, 0, INT_MAX
);
359 if (attr
== &sysfs_io_disable
) {
360 int v
= strtoul_or_return(buf
);
362 dc
->io_disable
= v
? 1 : 0;
365 sysfs_strtoul_clamp(sequential_cutoff
,
366 dc
->sequential_cutoff
,
368 d_strtoi_h(readahead
);
370 if (attr
== &sysfs_clear_stats
)
371 bch_cache_accounting_clear(&dc
->accounting
);
373 if (attr
== &sysfs_running
&&
374 strtoul_or_return(buf
)) {
375 v
= bch_cached_dev_run(dc
);
380 if (attr
== &sysfs_cache_mode
) {
381 v
= __sysfs_match_string(bch_cache_modes
, -1, buf
);
385 if ((unsigned int) v
!= BDEV_CACHE_MODE(&dc
->sb
)) {
386 SET_BDEV_CACHE_MODE(&dc
->sb
, v
);
387 bch_write_bdev_super(dc
, NULL
);
391 if (attr
== &sysfs_readahead_cache_policy
) {
392 v
= __sysfs_match_string(bch_reada_cache_policies
, -1, buf
);
396 if ((unsigned int) v
!= dc
->cache_readahead_policy
)
397 dc
->cache_readahead_policy
= v
;
400 if (attr
== &sysfs_stop_when_cache_set_failed
) {
401 v
= __sysfs_match_string(bch_stop_on_failure_modes
, -1, buf
);
405 dc
->stop_when_cache_set_failed
= v
;
408 if (attr
== &sysfs_label
) {
409 if (size
> SB_LABEL_SIZE
)
411 memcpy(dc
->sb
.label
, buf
, size
);
412 if (size
< SB_LABEL_SIZE
)
413 dc
->sb
.label
[size
] = '\0';
414 if (size
&& dc
->sb
.label
[size
- 1] == '\n')
415 dc
->sb
.label
[size
- 1] = '\0';
416 bch_write_bdev_super(dc
, NULL
);
418 memcpy(dc
->disk
.c
->uuids
[dc
->disk
.id
].label
,
420 bch_uuid_write(dc
->disk
.c
);
422 env
= kzalloc(sizeof(struct kobj_uevent_env
), GFP_KERNEL
);
425 add_uevent_var(env
, "DRIVER=bcache");
426 add_uevent_var(env
, "CACHED_UUID=%pU", dc
->sb
.uuid
);
427 add_uevent_var(env
, "CACHED_LABEL=%s", buf
);
428 kobject_uevent_env(&disk_to_dev(dc
->disk
.disk
)->kobj
,
434 if (attr
== &sysfs_attach
) {
435 uint8_t set_uuid
[16];
437 if (bch_parse_uuid(buf
, set_uuid
) < 16)
441 list_for_each_entry(c
, &bch_cache_sets
, list
) {
442 v
= bch_cached_dev_attach(dc
, c
, set_uuid
);
447 pr_err("Can't attach %s: cache set not found\n", buf
);
451 if (attr
== &sysfs_detach
&& dc
->disk
.c
)
452 bch_cached_dev_detach(dc
);
454 if (attr
== &sysfs_stop
)
455 bcache_device_stop(&dc
->disk
);
460 STORE(bch_cached_dev
)
462 struct cached_dev
*dc
= container_of(kobj
, struct cached_dev
,
465 /* no user space access if system is rebooting */
466 if (bcache_is_reboot
)
469 mutex_lock(&bch_register_lock
);
470 size
= __cached_dev_store(kobj
, attr
, buf
, size
);
472 if (attr
== &sysfs_writeback_running
) {
473 /* dc->writeback_running changed in __cached_dev_store() */
474 if (IS_ERR_OR_NULL(dc
->writeback_thread
)) {
476 * reject setting it to 1 via sysfs if writeback
477 * kthread is not created yet.
479 if (dc
->writeback_running
) {
480 dc
->writeback_running
= false;
481 pr_err("%s: failed to run non-existent writeback thread\n",
482 dc
->disk
.disk
->disk_name
);
486 * writeback kthread will check if dc->writeback_running
489 bch_writeback_queue(dc
);
493 * Only set BCACHE_DEV_WB_RUNNING when cached device attached to
494 * a cache set, otherwise it doesn't make sense.
496 if (attr
== &sysfs_writeback_percent
)
497 if ((dc
->disk
.c
!= NULL
) &&
498 (!test_and_set_bit(BCACHE_DEV_WB_RUNNING
, &dc
->disk
.flags
)))
499 schedule_delayed_work(&dc
->writeback_rate_update
,
500 dc
->writeback_rate_update_seconds
* HZ
);
502 mutex_unlock(&bch_register_lock
);
506 static struct attribute
*bch_cached_dev_files
[] = {
514 &sysfs_readahead_cache_policy
,
515 &sysfs_stop_when_cache_set_failed
,
516 &sysfs_writeback_metadata
,
517 &sysfs_writeback_running
,
518 &sysfs_writeback_delay
,
519 &sysfs_writeback_percent
,
520 &sysfs_writeback_rate
,
521 &sysfs_writeback_consider_fragment
,
522 &sysfs_writeback_rate_update_seconds
,
523 &sysfs_writeback_rate_i_term_inverse
,
524 &sysfs_writeback_rate_p_term_inverse
,
525 &sysfs_writeback_rate_fp_term_low
,
526 &sysfs_writeback_rate_fp_term_mid
,
527 &sysfs_writeback_rate_fp_term_high
,
528 &sysfs_writeback_rate_minimum
,
529 &sysfs_writeback_rate_debug
,
531 &sysfs_io_error_limit
,
535 &sysfs_partial_stripes_expensive
,
536 &sysfs_sequential_cutoff
,
542 #ifdef CONFIG_BCACHE_DEBUG
544 &sysfs_bypass_torture_test
,
546 &sysfs_backing_dev_name
,
547 &sysfs_backing_dev_uuid
,
550 KTYPE(bch_cached_dev
);
554 struct bcache_device
*d
= container_of(kobj
, struct bcache_device
,
556 struct uuid_entry
*u
= &d
->c
->uuids
[d
->id
];
558 sysfs_printf(data_csum
, "%i", d
->data_csum
);
559 sysfs_hprint(size
, u
->sectors
<< 9);
561 if (attr
== &sysfs_label
) {
562 memcpy(buf
, u
->label
, SB_LABEL_SIZE
);
563 buf
[SB_LABEL_SIZE
+ 1] = '\0';
571 STORE(__bch_flash_dev
)
573 struct bcache_device
*d
= container_of(kobj
, struct bcache_device
,
575 struct uuid_entry
*u
= &d
->c
->uuids
[d
->id
];
577 /* no user space access if system is rebooting */
578 if (bcache_is_reboot
)
581 sysfs_strtoul(data_csum
, d
->data_csum
);
583 if (attr
== &sysfs_size
) {
586 strtoi_h_or_return(buf
, v
);
589 bch_uuid_write(d
->c
);
590 set_capacity(d
->disk
, u
->sectors
);
593 if (attr
== &sysfs_label
) {
594 memcpy(u
->label
, buf
, SB_LABEL_SIZE
);
595 bch_uuid_write(d
->c
);
598 if (attr
== &sysfs_unregister
) {
599 set_bit(BCACHE_DEV_DETACHING
, &d
->flags
);
600 bcache_device_stop(d
);
605 STORE_LOCKED(bch_flash_dev
)
607 static struct attribute
*bch_flash_dev_files
[] = {
616 KTYPE(bch_flash_dev
);
618 struct bset_stats_op
{
621 struct bset_stats stats
;
624 static int bch_btree_bset_stats(struct btree_op
*b_op
, struct btree
*b
)
626 struct bset_stats_op
*op
= container_of(b_op
, struct bset_stats_op
, op
);
629 bch_btree_keys_stats(&b
->keys
, &op
->stats
);
634 static int bch_bset_print_stats(struct cache_set
*c
, char *buf
)
636 struct bset_stats_op op
;
639 memset(&op
, 0, sizeof(op
));
640 bch_btree_op_init(&op
.op
, -1);
642 ret
= bch_btree_map_nodes(&op
.op
, c
, &ZERO_KEY
, bch_btree_bset_stats
);
646 return snprintf(buf
, PAGE_SIZE
,
648 "written sets: %zu\n"
649 "unwritten sets: %zu\n"
650 "written key bytes: %zu\n"
651 "unwritten key bytes: %zu\n"
655 op
.stats
.sets_written
, op
.stats
.sets_unwritten
,
656 op
.stats
.bytes_written
, op
.stats
.bytes_unwritten
,
657 op
.stats
.floats
, op
.stats
.failed
);
660 static unsigned int bch_root_usage(struct cache_set
*c
)
662 unsigned int bytes
= 0;
665 struct btree_iter iter
;
673 rw_lock(false, b
, b
->level
);
674 } while (b
!= c
->root
);
676 for_each_key_filter(&b
->keys
, k
, &iter
, bch_ptr_bad
)
677 bytes
+= bkey_bytes(k
);
681 return (bytes
* 100) / btree_bytes(c
);
684 static size_t bch_cache_size(struct cache_set
*c
)
689 mutex_lock(&c
->bucket_lock
);
690 list_for_each_entry(b
, &c
->btree_cache
, list
)
691 ret
+= 1 << (b
->keys
.page_order
+ PAGE_SHIFT
);
693 mutex_unlock(&c
->bucket_lock
);
697 static unsigned int bch_cache_max_chain(struct cache_set
*c
)
699 unsigned int ret
= 0;
700 struct hlist_head
*h
;
702 mutex_lock(&c
->bucket_lock
);
704 for (h
= c
->bucket_hash
;
705 h
< c
->bucket_hash
+ (1 << BUCKET_HASH_BITS
);
708 struct hlist_node
*p
;
716 mutex_unlock(&c
->bucket_lock
);
720 static unsigned int bch_btree_used(struct cache_set
*c
)
722 return div64_u64(c
->gc_stats
.key_bytes
* 100,
723 (c
->gc_stats
.nodes
?: 1) * btree_bytes(c
));
726 static unsigned int bch_average_key_size(struct cache_set
*c
)
728 return c
->gc_stats
.nkeys
729 ? div64_u64(c
->gc_stats
.data
, c
->gc_stats
.nkeys
)
733 SHOW(__bch_cache_set
)
735 struct cache_set
*c
= container_of(kobj
, struct cache_set
, kobj
);
737 sysfs_print(synchronous
, CACHE_SYNC(&c
->cache
->sb
));
738 sysfs_print(journal_delay_ms
, c
->journal_delay_ms
);
739 sysfs_hprint(bucket_size
, bucket_bytes(c
->cache
));
740 sysfs_hprint(block_size
, block_bytes(c
->cache
));
741 sysfs_print(tree_depth
, c
->root
->level
);
742 sysfs_print(root_usage_percent
, bch_root_usage(c
));
744 sysfs_hprint(btree_cache_size
, bch_cache_size(c
));
745 sysfs_print(btree_cache_max_chain
, bch_cache_max_chain(c
));
746 sysfs_print(cache_available_percent
, 100 - c
->gc_stats
.in_use
);
748 sysfs_print_time_stats(&c
->btree_gc_time
, btree_gc
, sec
, ms
);
749 sysfs_print_time_stats(&c
->btree_split_time
, btree_split
, sec
, us
);
750 sysfs_print_time_stats(&c
->sort
.time
, btree_sort
, ms
, us
);
751 sysfs_print_time_stats(&c
->btree_read_time
, btree_read
, ms
, us
);
753 sysfs_print(btree_used_percent
, bch_btree_used(c
));
754 sysfs_print(btree_nodes
, c
->gc_stats
.nodes
);
755 sysfs_hprint(average_key_size
, bch_average_key_size(c
));
757 sysfs_print(cache_read_races
,
758 atomic_long_read(&c
->cache_read_races
));
761 atomic_long_read(&c
->reclaim
));
763 sysfs_print(reclaimed_journal_buckets
,
764 atomic_long_read(&c
->reclaimed_journal_buckets
));
766 sysfs_print(flush_write
,
767 atomic_long_read(&c
->flush_write
));
769 sysfs_print(writeback_keys_done
,
770 atomic_long_read(&c
->writeback_keys_done
));
771 sysfs_print(writeback_keys_failed
,
772 atomic_long_read(&c
->writeback_keys_failed
));
774 if (attr
== &sysfs_errors
)
775 return bch_snprint_string_list(buf
, PAGE_SIZE
, error_actions
,
778 /* See count_io_errors for why 88 */
779 sysfs_print(io_error_halflife
, c
->error_decay
* 88);
780 sysfs_print(io_error_limit
, c
->error_limit
);
782 sysfs_hprint(congested
,
783 ((uint64_t) bch_get_congested(c
)) << 9);
784 sysfs_print(congested_read_threshold_us
,
785 c
->congested_read_threshold_us
);
786 sysfs_print(congested_write_threshold_us
,
787 c
->congested_write_threshold_us
);
789 sysfs_print(cutoff_writeback
, bch_cutoff_writeback
);
790 sysfs_print(cutoff_writeback_sync
, bch_cutoff_writeback_sync
);
792 sysfs_print(active_journal_entries
, fifo_used(&c
->journal
.pin
));
793 sysfs_printf(verify
, "%i", c
->verify
);
794 sysfs_printf(key_merging_disabled
, "%i", c
->key_merging_disabled
);
795 sysfs_printf(expensive_debug_checks
,
796 "%i", c
->expensive_debug_checks
);
797 sysfs_printf(gc_always_rewrite
, "%i", c
->gc_always_rewrite
);
798 sysfs_printf(btree_shrinker_disabled
, "%i", c
->shrinker_disabled
);
799 sysfs_printf(copy_gc_enabled
, "%i", c
->copy_gc_enabled
);
800 sysfs_printf(idle_max_writeback_rate
, "%i",
801 c
->idle_max_writeback_rate_enabled
);
802 sysfs_printf(gc_after_writeback
, "%i", c
->gc_after_writeback
);
803 sysfs_printf(io_disable
, "%i",
804 test_bit(CACHE_SET_IO_DISABLE
, &c
->flags
));
806 if (attr
== &sysfs_bset_tree_stats
)
807 return bch_bset_print_stats(c
, buf
);
809 if (attr
== &sysfs_feature_compat
)
810 return bch_print_cache_set_feature_compat(c
, buf
, PAGE_SIZE
);
811 if (attr
== &sysfs_feature_ro_compat
)
812 return bch_print_cache_set_feature_ro_compat(c
, buf
, PAGE_SIZE
);
813 if (attr
== &sysfs_feature_incompat
)
814 return bch_print_cache_set_feature_incompat(c
, buf
, PAGE_SIZE
);
818 SHOW_LOCKED(bch_cache_set
)
820 STORE(__bch_cache_set
)
822 struct cache_set
*c
= container_of(kobj
, struct cache_set
, kobj
);
825 /* no user space access if system is rebooting */
826 if (bcache_is_reboot
)
829 if (attr
== &sysfs_unregister
)
830 bch_cache_set_unregister(c
);
832 if (attr
== &sysfs_stop
)
833 bch_cache_set_stop(c
);
835 if (attr
== &sysfs_synchronous
) {
836 bool sync
= strtoul_or_return(buf
);
838 if (sync
!= CACHE_SYNC(&c
->cache
->sb
)) {
839 SET_CACHE_SYNC(&c
->cache
->sb
, sync
);
840 bcache_write_super(c
);
844 if (attr
== &sysfs_flash_vol_create
) {
848 strtoi_h_or_return(buf
, v
);
850 r
= bch_flash_dev_create(c
, v
);
855 if (attr
== &sysfs_clear_stats
) {
856 atomic_long_set(&c
->writeback_keys_done
, 0);
857 atomic_long_set(&c
->writeback_keys_failed
, 0);
859 memset(&c
->gc_stats
, 0, sizeof(struct gc_stat
));
860 bch_cache_accounting_clear(&c
->accounting
);
863 if (attr
== &sysfs_trigger_gc
)
866 if (attr
== &sysfs_prune_cache
) {
867 struct shrink_control sc
;
869 sc
.gfp_mask
= GFP_KERNEL
;
870 sc
.nr_to_scan
= strtoul_or_return(buf
);
871 c
->shrink
.scan_objects(&c
->shrink
, &sc
);
874 sysfs_strtoul_clamp(congested_read_threshold_us
,
875 c
->congested_read_threshold_us
,
877 sysfs_strtoul_clamp(congested_write_threshold_us
,
878 c
->congested_write_threshold_us
,
881 if (attr
== &sysfs_errors
) {
882 v
= __sysfs_match_string(error_actions
, -1, buf
);
889 sysfs_strtoul_clamp(io_error_limit
, c
->error_limit
, 0, UINT_MAX
);
891 /* See count_io_errors() for why 88 */
892 if (attr
== &sysfs_io_error_halflife
) {
896 ret
= strtoul_safe_clamp(buf
, v
, 0, UINT_MAX
);
898 c
->error_decay
= v
/ 88;
904 if (attr
== &sysfs_io_disable
) {
905 v
= strtoul_or_return(buf
);
907 if (test_and_set_bit(CACHE_SET_IO_DISABLE
,
909 pr_warn("CACHE_SET_IO_DISABLE already set\n");
911 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE
,
913 pr_warn("CACHE_SET_IO_DISABLE already cleared\n");
917 sysfs_strtoul_clamp(journal_delay_ms
,
920 sysfs_strtoul_bool(verify
, c
->verify
);
921 sysfs_strtoul_bool(key_merging_disabled
, c
->key_merging_disabled
);
922 sysfs_strtoul(expensive_debug_checks
, c
->expensive_debug_checks
);
923 sysfs_strtoul_bool(gc_always_rewrite
, c
->gc_always_rewrite
);
924 sysfs_strtoul_bool(btree_shrinker_disabled
, c
->shrinker_disabled
);
925 sysfs_strtoul_bool(copy_gc_enabled
, c
->copy_gc_enabled
);
926 sysfs_strtoul_bool(idle_max_writeback_rate
,
927 c
->idle_max_writeback_rate_enabled
);
930 * write gc_after_writeback here may overwrite an already set
931 * BCH_DO_AUTO_GC, it doesn't matter because this flag will be
932 * set in next chance.
934 sysfs_strtoul_clamp(gc_after_writeback
, c
->gc_after_writeback
, 0, 1);
938 STORE_LOCKED(bch_cache_set
)
940 SHOW(bch_cache_set_internal
)
942 struct cache_set
*c
= container_of(kobj
, struct cache_set
, internal
);
944 return bch_cache_set_show(&c
->kobj
, attr
, buf
);
947 STORE(bch_cache_set_internal
)
949 struct cache_set
*c
= container_of(kobj
, struct cache_set
, internal
);
951 /* no user space access if system is rebooting */
952 if (bcache_is_reboot
)
955 return bch_cache_set_store(&c
->kobj
, attr
, buf
, size
);
958 static void bch_cache_set_internal_release(struct kobject
*k
)
962 static struct attribute
*bch_cache_set_files
[] = {
966 &sysfs_journal_delay_ms
,
967 &sysfs_flash_vol_create
,
972 &sysfs_root_usage_percent
,
973 &sysfs_btree_cache_size
,
974 &sysfs_cache_available_percent
,
976 &sysfs_average_key_size
,
979 &sysfs_io_error_limit
,
980 &sysfs_io_error_halflife
,
982 &sysfs_congested_read_threshold_us
,
983 &sysfs_congested_write_threshold_us
,
987 KTYPE(bch_cache_set
);
989 static struct attribute
*bch_cache_set_internal_files
[] = {
990 &sysfs_active_journal_entries
,
992 sysfs_time_stats_attribute_list(btree_gc
, sec
, ms
)
993 sysfs_time_stats_attribute_list(btree_split
, sec
, us
)
994 sysfs_time_stats_attribute_list(btree_sort
, ms
, us
)
995 sysfs_time_stats_attribute_list(btree_read
, ms
, us
)
998 &sysfs_btree_used_percent
,
999 &sysfs_btree_cache_max_chain
,
1001 &sysfs_bset_tree_stats
,
1002 &sysfs_cache_read_races
,
1004 &sysfs_reclaimed_journal_buckets
,
1006 &sysfs_writeback_keys_done
,
1007 &sysfs_writeback_keys_failed
,
1011 #ifdef CONFIG_BCACHE_DEBUG
1013 &sysfs_key_merging_disabled
,
1014 &sysfs_expensive_debug_checks
,
1016 &sysfs_gc_always_rewrite
,
1017 &sysfs_btree_shrinker_disabled
,
1018 &sysfs_copy_gc_enabled
,
1019 &sysfs_idle_max_writeback_rate
,
1020 &sysfs_gc_after_writeback
,
1022 &sysfs_cutoff_writeback
,
1023 &sysfs_cutoff_writeback_sync
,
1024 &sysfs_feature_compat
,
1025 &sysfs_feature_ro_compat
,
1026 &sysfs_feature_incompat
,
1029 KTYPE(bch_cache_set_internal
);
1031 static int __bch_cache_cmp(const void *l
, const void *r
)
1034 return *((uint16_t *)r
) - *((uint16_t *)l
);
1039 struct cache
*ca
= container_of(kobj
, struct cache
, kobj
);
1041 sysfs_hprint(bucket_size
, bucket_bytes(ca
));
1042 sysfs_hprint(block_size
, block_bytes(ca
));
1043 sysfs_print(nbuckets
, ca
->sb
.nbuckets
);
1044 sysfs_print(discard
, ca
->discard
);
1045 sysfs_hprint(written
, atomic_long_read(&ca
->sectors_written
) << 9);
1046 sysfs_hprint(btree_written
,
1047 atomic_long_read(&ca
->btree_sectors_written
) << 9);
1048 sysfs_hprint(metadata_written
,
1049 (atomic_long_read(&ca
->meta_sectors_written
) +
1050 atomic_long_read(&ca
->btree_sectors_written
)) << 9);
1052 sysfs_print(io_errors
,
1053 atomic_read(&ca
->io_errors
) >> IO_ERROR_SHIFT
);
1055 if (attr
== &sysfs_cache_replacement_policy
)
1056 return bch_snprint_string_list(buf
, PAGE_SIZE
,
1057 cache_replacement_policies
,
1058 CACHE_REPLACEMENT(&ca
->sb
));
1060 if (attr
== &sysfs_priority_stats
) {
1062 size_t n
= ca
->sb
.nbuckets
, i
;
1063 size_t unused
= 0, available
= 0, dirty
= 0, meta
= 0;
1065 /* Compute 31 quantiles */
1066 uint16_t q
[31], *p
, *cached
;
1069 cached
= p
= vmalloc(array_size(sizeof(uint16_t),
1074 mutex_lock(&ca
->set
->bucket_lock
);
1075 for_each_bucket(b
, ca
) {
1076 if (!GC_SECTORS_USED(b
))
1078 if (GC_MARK(b
) == GC_MARK_RECLAIMABLE
)
1080 if (GC_MARK(b
) == GC_MARK_DIRTY
)
1082 if (GC_MARK(b
) == GC_MARK_METADATA
)
1086 for (i
= ca
->sb
.first_bucket
; i
< n
; i
++)
1087 p
[i
] = ca
->buckets
[i
].prio
;
1088 mutex_unlock(&ca
->set
->bucket_lock
);
1090 sort(p
, n
, sizeof(uint16_t), __bch_cache_cmp
, NULL
);
1096 while (cached
< p
+ n
&&
1097 *cached
== BTREE_PRIO
) {
1102 for (i
= 0; i
< n
; i
++)
1103 sum
+= INITIAL_PRIO
- cached
[i
];
1108 for (i
= 0; i
< ARRAY_SIZE(q
); i
++)
1109 q
[i
] = INITIAL_PRIO
- cached
[n
* (i
+ 1) /
1110 (ARRAY_SIZE(q
) + 1)];
1114 ret
= scnprintf(buf
, PAGE_SIZE
,
1120 "Sectors per Q: %zu\n"
1122 unused
* 100 / (size_t) ca
->sb
.nbuckets
,
1123 available
* 100 / (size_t) ca
->sb
.nbuckets
,
1124 dirty
* 100 / (size_t) ca
->sb
.nbuckets
,
1125 meta
* 100 / (size_t) ca
->sb
.nbuckets
, sum
,
1126 n
* ca
->sb
.bucket_size
/ (ARRAY_SIZE(q
) + 1));
1128 for (i
= 0; i
< ARRAY_SIZE(q
); i
++)
1129 ret
+= scnprintf(buf
+ ret
, PAGE_SIZE
- ret
,
1133 ret
+= scnprintf(buf
+ ret
, PAGE_SIZE
- ret
, "]\n");
1140 SHOW_LOCKED(bch_cache
)
1144 struct cache
*ca
= container_of(kobj
, struct cache
, kobj
);
1147 /* no user space access if system is rebooting */
1148 if (bcache_is_reboot
)
1151 if (attr
== &sysfs_discard
) {
1152 bool v
= strtoul_or_return(buf
);
1154 if (blk_queue_discard(bdev_get_queue(ca
->bdev
)))
1157 if (v
!= CACHE_DISCARD(&ca
->sb
)) {
1158 SET_CACHE_DISCARD(&ca
->sb
, v
);
1159 bcache_write_super(ca
->set
);
1163 if (attr
== &sysfs_cache_replacement_policy
) {
1164 v
= __sysfs_match_string(cache_replacement_policies
, -1, buf
);
1168 if ((unsigned int) v
!= CACHE_REPLACEMENT(&ca
->sb
)) {
1169 mutex_lock(&ca
->set
->bucket_lock
);
1170 SET_CACHE_REPLACEMENT(&ca
->sb
, v
);
1171 mutex_unlock(&ca
->set
->bucket_lock
);
1173 bcache_write_super(ca
->set
);
1177 if (attr
== &sysfs_clear_stats
) {
1178 atomic_long_set(&ca
->sectors_written
, 0);
1179 atomic_long_set(&ca
->btree_sectors_written
, 0);
1180 atomic_long_set(&ca
->meta_sectors_written
, 0);
1181 atomic_set(&ca
->io_count
, 0);
1182 atomic_set(&ca
->io_errors
, 0);
1187 STORE_LOCKED(bch_cache
)
1189 static struct attribute
*bch_cache_files
[] = {
1193 &sysfs_priority_stats
,
1196 &sysfs_btree_written
,
1197 &sysfs_metadata_written
,
1200 &sysfs_cache_replacement_policy
,