2 * bcache sysfs interfaces
4 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
5 * Copyright 2012 Google, Inc.
12 #include "writeback.h"
14 #include <linux/blkdev.h>
15 #include <linux/sort.h>
17 static const char * const cache_replacement_policies
[] = {
24 write_attribute(attach
);
25 write_attribute(detach
);
26 write_attribute(unregister
);
27 write_attribute(stop
);
28 write_attribute(clear_stats
);
29 write_attribute(trigger_gc
);
30 write_attribute(prune_cache
);
31 write_attribute(flash_vol_create
);
33 read_attribute(bucket_size
);
34 read_attribute(block_size
);
35 read_attribute(nbuckets
);
36 read_attribute(tree_depth
);
37 read_attribute(root_usage_percent
);
38 read_attribute(priority_stats
);
39 read_attribute(btree_cache_size
);
40 read_attribute(btree_cache_max_chain
);
41 read_attribute(cache_available_percent
);
42 read_attribute(written
);
43 read_attribute(btree_written
);
44 read_attribute(metadata_written
);
45 read_attribute(active_journal_entries
);
47 sysfs_time_stats_attribute(btree_gc
, sec
, ms
);
48 sysfs_time_stats_attribute(btree_split
, sec
, us
);
49 sysfs_time_stats_attribute(btree_sort
, ms
, us
);
50 sysfs_time_stats_attribute(btree_read
, ms
, us
);
51 sysfs_time_stats_attribute(try_harder
, ms
, us
);
53 read_attribute(btree_nodes
);
54 read_attribute(btree_used_percent
);
55 read_attribute(average_key_size
);
56 read_attribute(dirty_data
);
57 read_attribute(bset_tree_stats
);
59 read_attribute(state
);
60 read_attribute(cache_read_races
);
61 read_attribute(writeback_keys_done
);
62 read_attribute(writeback_keys_failed
);
63 read_attribute(io_errors
);
64 read_attribute(congested
);
65 rw_attribute(congested_read_threshold_us
);
66 rw_attribute(congested_write_threshold_us
);
68 rw_attribute(sequential_cutoff
);
69 rw_attribute(sequential_merge
);
70 rw_attribute(data_csum
);
71 rw_attribute(cache_mode
);
72 rw_attribute(writeback_metadata
);
73 rw_attribute(writeback_running
);
74 rw_attribute(writeback_percent
);
75 rw_attribute(writeback_delay
);
76 rw_attribute(writeback_rate
);
78 rw_attribute(writeback_rate_update_seconds
);
79 rw_attribute(writeback_rate_d_term
);
80 rw_attribute(writeback_rate_p_term_inverse
);
81 rw_attribute(writeback_rate_d_smooth
);
82 read_attribute(writeback_rate_debug
);
84 read_attribute(stripe_size
);
85 read_attribute(partial_stripes_expensive
);
87 rw_attribute(synchronous
);
88 rw_attribute(journal_delay_ms
);
89 rw_attribute(discard
);
90 rw_attribute(running
);
92 rw_attribute(readahead
);
93 rw_attribute(io_error_limit
);
94 rw_attribute(io_error_halflife
);
96 rw_attribute(key_merging_disabled
);
97 rw_attribute(gc_always_rewrite
);
98 rw_attribute(freelist_percent
);
99 rw_attribute(cache_replacement_policy
);
100 rw_attribute(btree_shrinker_disabled
);
101 rw_attribute(copy_gc_enabled
);
104 SHOW(__bch_cached_dev
)
106 struct cached_dev
*dc
= container_of(kobj
, struct cached_dev
,
108 const char *states
[] = { "no cache", "clean", "dirty", "inconsistent" };
110 #define var(stat) (dc->stat)
112 if (attr
== &sysfs_cache_mode
)
113 return bch_snprint_string_list(buf
, PAGE_SIZE
,
115 BDEV_CACHE_MODE(&dc
->sb
));
117 sysfs_printf(data_csum
, "%i", dc
->disk
.data_csum
);
118 var_printf(verify
, "%i");
119 var_printf(writeback_metadata
, "%i");
120 var_printf(writeback_running
, "%i");
121 var_print(writeback_delay
);
122 var_print(writeback_percent
);
123 sysfs_print(writeback_rate
, dc
->writeback_rate
.rate
);
125 var_print(writeback_rate_update_seconds
);
126 var_print(writeback_rate_d_term
);
127 var_print(writeback_rate_p_term_inverse
);
128 var_print(writeback_rate_d_smooth
);
130 if (attr
== &sysfs_writeback_rate_debug
) {
135 bcache_dev_sectors_dirty(&dc
->disk
) << 9);
136 bch_hprint(derivative
, dc
->writeback_rate_derivative
<< 9);
137 bch_hprint(target
, dc
->writeback_rate_target
<< 9);
145 dc
->writeback_rate
.rate
,
146 dc
->writeback_rate_change
,
147 dirty
, derivative
, target
);
150 sysfs_hprint(dirty_data
,
151 bcache_dev_sectors_dirty(&dc
->disk
) << 9);
153 sysfs_hprint(stripe_size
, (1 << dc
->disk
.stripe_size_bits
) << 9);
154 var_printf(partial_stripes_expensive
, "%u");
156 var_printf(sequential_merge
, "%i");
157 var_hprint(sequential_cutoff
);
158 var_hprint(readahead
);
160 sysfs_print(running
, atomic_read(&dc
->running
));
161 sysfs_print(state
, states
[BDEV_STATE(&dc
->sb
)]);
163 if (attr
== &sysfs_label
) {
164 memcpy(buf
, dc
->sb
.label
, SB_LABEL_SIZE
);
165 buf
[SB_LABEL_SIZE
+ 1] = '\0';
173 SHOW_LOCKED(bch_cached_dev
)
177 struct cached_dev
*dc
= container_of(kobj
, struct cached_dev
,
181 struct kobj_uevent_env
*env
;
183 #define d_strtoul(var) sysfs_strtoul(var, dc->var)
184 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
186 sysfs_strtoul(data_csum
, dc
->disk
.data_csum
);
188 d_strtoul(writeback_metadata
);
189 d_strtoul(writeback_running
);
190 d_strtoul(writeback_delay
);
191 sysfs_strtoul_clamp(writeback_rate
,
192 dc
->writeback_rate
.rate
, 1, 1000000);
193 sysfs_strtoul_clamp(writeback_percent
, dc
->writeback_percent
, 0, 40);
195 d_strtoul(writeback_rate_update_seconds
);
196 d_strtoul(writeback_rate_d_term
);
197 d_strtoul(writeback_rate_p_term_inverse
);
198 sysfs_strtoul_clamp(writeback_rate_p_term_inverse
,
199 dc
->writeback_rate_p_term_inverse
, 1, INT_MAX
);
200 d_strtoul(writeback_rate_d_smooth
);
202 d_strtoul(sequential_merge
);
203 d_strtoi_h(sequential_cutoff
);
204 d_strtoi_h(readahead
);
206 if (attr
== &sysfs_clear_stats
)
207 bch_cache_accounting_clear(&dc
->accounting
);
209 if (attr
== &sysfs_running
&&
210 strtoul_or_return(buf
))
211 bch_cached_dev_run(dc
);
213 if (attr
== &sysfs_cache_mode
) {
214 ssize_t v
= bch_read_string_list(buf
, bch_cache_modes
+ 1);
219 if ((unsigned) v
!= BDEV_CACHE_MODE(&dc
->sb
)) {
220 SET_BDEV_CACHE_MODE(&dc
->sb
, v
);
221 bch_write_bdev_super(dc
, NULL
);
225 if (attr
== &sysfs_label
) {
226 /* note: endlines are preserved */
227 memcpy(dc
->sb
.label
, buf
, SB_LABEL_SIZE
);
228 bch_write_bdev_super(dc
, NULL
);
230 memcpy(dc
->disk
.c
->uuids
[dc
->disk
.id
].label
,
232 bch_uuid_write(dc
->disk
.c
);
234 env
= kzalloc(sizeof(struct kobj_uevent_env
), GFP_KERNEL
);
237 add_uevent_var(env
, "DRIVER=bcache");
238 add_uevent_var(env
, "CACHED_UUID=%pU", dc
->sb
.uuid
),
239 add_uevent_var(env
, "CACHED_LABEL=%s", buf
);
241 &disk_to_dev(dc
->disk
.disk
)->kobj
, KOBJ_CHANGE
, env
->envp
);
245 if (attr
== &sysfs_attach
) {
246 if (bch_parse_uuid(buf
, dc
->sb
.set_uuid
) < 16)
249 list_for_each_entry(c
, &bch_cache_sets
, list
) {
250 v
= bch_cached_dev_attach(dc
, c
);
255 pr_err("Can't attach %s: cache set not found", buf
);
259 if (attr
== &sysfs_detach
&& dc
->disk
.c
)
260 bch_cached_dev_detach(dc
);
262 if (attr
== &sysfs_stop
)
263 bcache_device_stop(&dc
->disk
);
268 STORE(bch_cached_dev
)
270 struct cached_dev
*dc
= container_of(kobj
, struct cached_dev
,
273 mutex_lock(&bch_register_lock
);
274 size
= __cached_dev_store(kobj
, attr
, buf
, size
);
276 if (attr
== &sysfs_writeback_running
)
277 bch_writeback_queue(dc
);
279 if (attr
== &sysfs_writeback_percent
)
280 schedule_delayed_work(&dc
->writeback_rate_update
,
281 dc
->writeback_rate_update_seconds
* HZ
);
283 mutex_unlock(&bch_register_lock
);
287 static struct attribute
*bch_cached_dev_files
[] = {
295 &sysfs_writeback_metadata
,
296 &sysfs_writeback_running
,
297 &sysfs_writeback_delay
,
298 &sysfs_writeback_percent
,
299 &sysfs_writeback_rate
,
300 &sysfs_writeback_rate_update_seconds
,
301 &sysfs_writeback_rate_d_term
,
302 &sysfs_writeback_rate_p_term_inverse
,
303 &sysfs_writeback_rate_d_smooth
,
304 &sysfs_writeback_rate_debug
,
307 &sysfs_partial_stripes_expensive
,
308 &sysfs_sequential_cutoff
,
309 &sysfs_sequential_merge
,
315 #ifdef CONFIG_BCACHE_DEBUG
320 KTYPE(bch_cached_dev
);
324 struct bcache_device
*d
= container_of(kobj
, struct bcache_device
,
326 struct uuid_entry
*u
= &d
->c
->uuids
[d
->id
];
328 sysfs_printf(data_csum
, "%i", d
->data_csum
);
329 sysfs_hprint(size
, u
->sectors
<< 9);
331 if (attr
== &sysfs_label
) {
332 memcpy(buf
, u
->label
, SB_LABEL_SIZE
);
333 buf
[SB_LABEL_SIZE
+ 1] = '\0';
341 STORE(__bch_flash_dev
)
343 struct bcache_device
*d
= container_of(kobj
, struct bcache_device
,
345 struct uuid_entry
*u
= &d
->c
->uuids
[d
->id
];
347 sysfs_strtoul(data_csum
, d
->data_csum
);
349 if (attr
== &sysfs_size
) {
351 strtoi_h_or_return(buf
, v
);
354 bch_uuid_write(d
->c
);
355 set_capacity(d
->disk
, u
->sectors
);
358 if (attr
== &sysfs_label
) {
359 memcpy(u
->label
, buf
, SB_LABEL_SIZE
);
360 bch_uuid_write(d
->c
);
363 if (attr
== &sysfs_unregister
) {
364 atomic_set(&d
->detaching
, 1);
365 bcache_device_stop(d
);
370 STORE_LOCKED(bch_flash_dev
)
372 static struct attribute
*bch_flash_dev_files
[] = {
381 KTYPE(bch_flash_dev
);
383 SHOW(__bch_cache_set
)
385 unsigned root_usage(struct cache_set
*c
)
390 struct btree_iter iter
;
398 rw_lock(false, b
, b
->level
);
399 } while (b
!= c
->root
);
401 for_each_key_filter(b
, k
, &iter
, bch_ptr_bad
)
402 bytes
+= bkey_bytes(k
);
406 return (bytes
* 100) / btree_bytes(c
);
409 size_t cache_size(struct cache_set
*c
)
414 mutex_lock(&c
->bucket_lock
);
415 list_for_each_entry(b
, &c
->btree_cache
, list
)
416 ret
+= 1 << (b
->page_order
+ PAGE_SHIFT
);
418 mutex_unlock(&c
->bucket_lock
);
422 unsigned cache_max_chain(struct cache_set
*c
)
425 struct hlist_head
*h
;
427 mutex_lock(&c
->bucket_lock
);
429 for (h
= c
->bucket_hash
;
430 h
< c
->bucket_hash
+ (1 << BUCKET_HASH_BITS
);
433 struct hlist_node
*p
;
441 mutex_unlock(&c
->bucket_lock
);
445 unsigned btree_used(struct cache_set
*c
)
447 return div64_u64(c
->gc_stats
.key_bytes
* 100,
448 (c
->gc_stats
.nodes
?: 1) * btree_bytes(c
));
451 unsigned average_key_size(struct cache_set
*c
)
453 return c
->gc_stats
.nkeys
454 ? div64_u64(c
->gc_stats
.data
, c
->gc_stats
.nkeys
)
458 struct cache_set
*c
= container_of(kobj
, struct cache_set
, kobj
);
460 sysfs_print(synchronous
, CACHE_SYNC(&c
->sb
));
461 sysfs_print(journal_delay_ms
, c
->journal_delay_ms
);
462 sysfs_hprint(bucket_size
, bucket_bytes(c
));
463 sysfs_hprint(block_size
, block_bytes(c
));
464 sysfs_print(tree_depth
, c
->root
->level
);
465 sysfs_print(root_usage_percent
, root_usage(c
));
467 sysfs_hprint(btree_cache_size
, cache_size(c
));
468 sysfs_print(btree_cache_max_chain
, cache_max_chain(c
));
469 sysfs_print(cache_available_percent
, 100 - c
->gc_stats
.in_use
);
471 sysfs_print_time_stats(&c
->btree_gc_time
, btree_gc
, sec
, ms
);
472 sysfs_print_time_stats(&c
->btree_split_time
, btree_split
, sec
, us
);
473 sysfs_print_time_stats(&c
->sort_time
, btree_sort
, ms
, us
);
474 sysfs_print_time_stats(&c
->btree_read_time
, btree_read
, ms
, us
);
475 sysfs_print_time_stats(&c
->try_harder_time
, try_harder
, ms
, us
);
477 sysfs_print(btree_used_percent
, btree_used(c
));
478 sysfs_print(btree_nodes
, c
->gc_stats
.nodes
);
479 sysfs_hprint(dirty_data
, c
->gc_stats
.dirty
);
480 sysfs_hprint(average_key_size
, average_key_size(c
));
482 sysfs_print(cache_read_races
,
483 atomic_long_read(&c
->cache_read_races
));
485 sysfs_print(writeback_keys_done
,
486 atomic_long_read(&c
->writeback_keys_done
));
487 sysfs_print(writeback_keys_failed
,
488 atomic_long_read(&c
->writeback_keys_failed
));
490 /* See count_io_errors for why 88 */
491 sysfs_print(io_error_halflife
, c
->error_decay
* 88);
492 sysfs_print(io_error_limit
, c
->error_limit
>> IO_ERROR_SHIFT
);
494 sysfs_hprint(congested
,
495 ((uint64_t) bch_get_congested(c
)) << 9);
496 sysfs_print(congested_read_threshold_us
,
497 c
->congested_read_threshold_us
);
498 sysfs_print(congested_write_threshold_us
,
499 c
->congested_write_threshold_us
);
501 sysfs_print(active_journal_entries
, fifo_used(&c
->journal
.pin
));
502 sysfs_printf(verify
, "%i", c
->verify
);
503 sysfs_printf(key_merging_disabled
, "%i", c
->key_merging_disabled
);
504 sysfs_printf(gc_always_rewrite
, "%i", c
->gc_always_rewrite
);
505 sysfs_printf(btree_shrinker_disabled
, "%i", c
->shrinker_disabled
);
506 sysfs_printf(copy_gc_enabled
, "%i", c
->copy_gc_enabled
);
508 if (attr
== &sysfs_bset_tree_stats
)
509 return bch_bset_print_stats(c
, buf
);
513 SHOW_LOCKED(bch_cache_set
)
515 STORE(__bch_cache_set
)
517 struct cache_set
*c
= container_of(kobj
, struct cache_set
, kobj
);
519 if (attr
== &sysfs_unregister
)
520 bch_cache_set_unregister(c
);
522 if (attr
== &sysfs_stop
)
523 bch_cache_set_stop(c
);
525 if (attr
== &sysfs_synchronous
) {
526 bool sync
= strtoul_or_return(buf
);
528 if (sync
!= CACHE_SYNC(&c
->sb
)) {
529 SET_CACHE_SYNC(&c
->sb
, sync
);
530 bcache_write_super(c
);
534 if (attr
== &sysfs_flash_vol_create
) {
537 strtoi_h_or_return(buf
, v
);
539 r
= bch_flash_dev_create(c
, v
);
544 if (attr
== &sysfs_clear_stats
) {
545 atomic_long_set(&c
->writeback_keys_done
, 0);
546 atomic_long_set(&c
->writeback_keys_failed
, 0);
548 memset(&c
->gc_stats
, 0, sizeof(struct gc_stat
));
549 bch_cache_accounting_clear(&c
->accounting
);
552 if (attr
== &sysfs_trigger_gc
)
555 if (attr
== &sysfs_prune_cache
) {
556 struct shrink_control sc
;
557 sc
.gfp_mask
= GFP_KERNEL
;
558 sc
.nr_to_scan
= strtoul_or_return(buf
);
559 c
->shrink
.shrink(&c
->shrink
, &sc
);
562 sysfs_strtoul(congested_read_threshold_us
,
563 c
->congested_read_threshold_us
);
564 sysfs_strtoul(congested_write_threshold_us
,
565 c
->congested_write_threshold_us
);
567 if (attr
== &sysfs_io_error_limit
)
568 c
->error_limit
= strtoul_or_return(buf
) << IO_ERROR_SHIFT
;
570 /* See count_io_errors() for why 88 */
571 if (attr
== &sysfs_io_error_halflife
)
572 c
->error_decay
= strtoul_or_return(buf
) / 88;
574 sysfs_strtoul(journal_delay_ms
, c
->journal_delay_ms
);
575 sysfs_strtoul(verify
, c
->verify
);
576 sysfs_strtoul(key_merging_disabled
, c
->key_merging_disabled
);
577 sysfs_strtoul(gc_always_rewrite
, c
->gc_always_rewrite
);
578 sysfs_strtoul(btree_shrinker_disabled
, c
->shrinker_disabled
);
579 sysfs_strtoul(copy_gc_enabled
, c
->copy_gc_enabled
);
583 STORE_LOCKED(bch_cache_set
)
585 SHOW(bch_cache_set_internal
)
587 struct cache_set
*c
= container_of(kobj
, struct cache_set
, internal
);
588 return bch_cache_set_show(&c
->kobj
, attr
, buf
);
591 STORE(bch_cache_set_internal
)
593 struct cache_set
*c
= container_of(kobj
, struct cache_set
, internal
);
594 return bch_cache_set_store(&c
->kobj
, attr
, buf
, size
);
597 static void bch_cache_set_internal_release(struct kobject
*k
)
601 static struct attribute
*bch_cache_set_files
[] = {
605 &sysfs_journal_delay_ms
,
606 &sysfs_flash_vol_create
,
611 &sysfs_root_usage_percent
,
612 &sysfs_btree_cache_size
,
613 &sysfs_cache_available_percent
,
615 &sysfs_average_key_size
,
618 &sysfs_io_error_limit
,
619 &sysfs_io_error_halflife
,
621 &sysfs_congested_read_threshold_us
,
622 &sysfs_congested_write_threshold_us
,
626 KTYPE(bch_cache_set
);
628 static struct attribute
*bch_cache_set_internal_files
[] = {
629 &sysfs_active_journal_entries
,
631 sysfs_time_stats_attribute_list(btree_gc
, sec
, ms
)
632 sysfs_time_stats_attribute_list(btree_split
, sec
, us
)
633 sysfs_time_stats_attribute_list(btree_sort
, ms
, us
)
634 sysfs_time_stats_attribute_list(btree_read
, ms
, us
)
635 sysfs_time_stats_attribute_list(try_harder
, ms
, us
)
638 &sysfs_btree_used_percent
,
639 &sysfs_btree_cache_max_chain
,
641 &sysfs_bset_tree_stats
,
642 &sysfs_cache_read_races
,
643 &sysfs_writeback_keys_done
,
644 &sysfs_writeback_keys_failed
,
648 #ifdef CONFIG_BCACHE_DEBUG
650 &sysfs_key_merging_disabled
,
652 &sysfs_gc_always_rewrite
,
653 &sysfs_btree_shrinker_disabled
,
654 &sysfs_copy_gc_enabled
,
657 KTYPE(bch_cache_set_internal
);
661 struct cache
*ca
= container_of(kobj
, struct cache
, kobj
);
663 sysfs_hprint(bucket_size
, bucket_bytes(ca
));
664 sysfs_hprint(block_size
, block_bytes(ca
));
665 sysfs_print(nbuckets
, ca
->sb
.nbuckets
);
666 sysfs_print(discard
, ca
->discard
);
667 sysfs_hprint(written
, atomic_long_read(&ca
->sectors_written
) << 9);
668 sysfs_hprint(btree_written
,
669 atomic_long_read(&ca
->btree_sectors_written
) << 9);
670 sysfs_hprint(metadata_written
,
671 (atomic_long_read(&ca
->meta_sectors_written
) +
672 atomic_long_read(&ca
->btree_sectors_written
)) << 9);
674 sysfs_print(io_errors
,
675 atomic_read(&ca
->io_errors
) >> IO_ERROR_SHIFT
);
677 sysfs_print(freelist_percent
, ca
->free
.size
* 100 /
678 ((size_t) ca
->sb
.nbuckets
));
680 if (attr
== &sysfs_cache_replacement_policy
)
681 return bch_snprint_string_list(buf
, PAGE_SIZE
,
682 cache_replacement_policies
,
683 CACHE_REPLACEMENT(&ca
->sb
));
685 if (attr
== &sysfs_priority_stats
) {
686 int cmp(const void *l
, const void *r
)
687 { return *((uint16_t *) r
) - *((uint16_t *) l
); }
689 size_t n
= ca
->sb
.nbuckets
, i
, unused
, btree
;
691 /* Compute 31 quantiles */
692 uint16_t q
[31], *p
, *cached
;
695 cached
= p
= vmalloc(ca
->sb
.nbuckets
* sizeof(uint16_t));
699 mutex_lock(&ca
->set
->bucket_lock
);
700 for (i
= ca
->sb
.first_bucket
; i
< n
; i
++)
701 p
[i
] = ca
->buckets
[i
].prio
;
702 mutex_unlock(&ca
->set
->bucket_lock
);
704 sort(p
, n
, sizeof(uint16_t), cmp
, NULL
);
710 unused
= ca
->sb
.nbuckets
- n
;
712 while (cached
< p
+ n
&&
713 *cached
== BTREE_PRIO
)
719 for (i
= 0; i
< n
; i
++)
720 sum
+= INITIAL_PRIO
- cached
[i
];
725 for (i
= 0; i
< ARRAY_SIZE(q
); i
++)
726 q
[i
] = INITIAL_PRIO
- cached
[n
* (i
+ 1) /
727 (ARRAY_SIZE(q
) + 1)];
731 ret
= scnprintf(buf
, PAGE_SIZE
,
735 "Sectors per Q: %zu\n"
737 unused
* 100 / (size_t) ca
->sb
.nbuckets
,
738 btree
* 100 / (size_t) ca
->sb
.nbuckets
, sum
,
739 n
* ca
->sb
.bucket_size
/ (ARRAY_SIZE(q
) + 1));
741 for (i
= 0; i
< ARRAY_SIZE(q
); i
++)
742 ret
+= scnprintf(buf
+ ret
, PAGE_SIZE
- ret
,
746 ret
+= scnprintf(buf
+ ret
, PAGE_SIZE
- ret
, "]\n");
753 SHOW_LOCKED(bch_cache
)
757 struct cache
*ca
= container_of(kobj
, struct cache
, kobj
);
759 if (attr
== &sysfs_discard
) {
760 bool v
= strtoul_or_return(buf
);
762 if (blk_queue_discard(bdev_get_queue(ca
->bdev
)))
765 if (v
!= CACHE_DISCARD(&ca
->sb
)) {
766 SET_CACHE_DISCARD(&ca
->sb
, v
);
767 bcache_write_super(ca
->set
);
771 if (attr
== &sysfs_cache_replacement_policy
) {
772 ssize_t v
= bch_read_string_list(buf
, cache_replacement_policies
);
777 if ((unsigned) v
!= CACHE_REPLACEMENT(&ca
->sb
)) {
778 mutex_lock(&ca
->set
->bucket_lock
);
779 SET_CACHE_REPLACEMENT(&ca
->sb
, v
);
780 mutex_unlock(&ca
->set
->bucket_lock
);
782 bcache_write_super(ca
->set
);
786 if (attr
== &sysfs_freelist_percent
) {
787 DECLARE_FIFO(long, free
);
789 size_t p
= strtoul_or_return(buf
);
792 ((size_t) ca
->sb
.nbuckets
* p
) / 100,
793 roundup_pow_of_two(ca
->sb
.nbuckets
) >> 9,
794 ca
->sb
.nbuckets
/ 2);
796 if (!init_fifo_exact(&free
, p
, GFP_KERNEL
))
799 mutex_lock(&ca
->set
->bucket_lock
);
801 fifo_move(&free
, &ca
->free
);
802 fifo_swap(&free
, &ca
->free
);
804 mutex_unlock(&ca
->set
->bucket_lock
);
806 while (fifo_pop(&free
, i
))
807 atomic_dec(&ca
->buckets
[i
].pin
);
812 if (attr
== &sysfs_clear_stats
) {
813 atomic_long_set(&ca
->sectors_written
, 0);
814 atomic_long_set(&ca
->btree_sectors_written
, 0);
815 atomic_long_set(&ca
->meta_sectors_written
, 0);
816 atomic_set(&ca
->io_count
, 0);
817 atomic_set(&ca
->io_errors
, 0);
822 STORE_LOCKED(bch_cache
)
824 static struct attribute
*bch_cache_files
[] = {
828 &sysfs_priority_stats
,
831 &sysfs_btree_written
,
832 &sysfs_metadata_written
,
835 &sysfs_freelist_percent
,
836 &sysfs_cache_replacement_policy
,