diff options
Diffstat (limited to 'drivers/md/bcache/sysfs.c')
| -rw-r--r-- | drivers/md/bcache/sysfs.c | 817 |
1 files changed, 817 insertions, 0 deletions
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c new file mode 100644 index 000000000000..4d9cca47e4c6 --- /dev/null +++ b/drivers/md/bcache/sysfs.c @@ -0,0 +1,817 @@ +/* + * bcache sysfs interfaces + * + * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> + * Copyright 2012 Google, Inc. + */ + +#include "bcache.h" +#include "sysfs.h" +#include "btree.h" +#include "request.h" + +#include <linux/sort.h> + +static const char * const cache_replacement_policies[] = { + "lru", + "fifo", + "random", + NULL +}; + +write_attribute(attach); +write_attribute(detach); +write_attribute(unregister); +write_attribute(stop); +write_attribute(clear_stats); +write_attribute(trigger_gc); +write_attribute(prune_cache); +write_attribute(flash_vol_create); + +read_attribute(bucket_size); +read_attribute(block_size); +read_attribute(nbuckets); +read_attribute(tree_depth); +read_attribute(root_usage_percent); +read_attribute(priority_stats); +read_attribute(btree_cache_size); +read_attribute(btree_cache_max_chain); +read_attribute(cache_available_percent); +read_attribute(written); +read_attribute(btree_written); +read_attribute(metadata_written); +read_attribute(active_journal_entries); + +sysfs_time_stats_attribute(btree_gc, sec, ms); +sysfs_time_stats_attribute(btree_split, sec, us); +sysfs_time_stats_attribute(btree_sort, ms, us); +sysfs_time_stats_attribute(btree_read, ms, us); +sysfs_time_stats_attribute(try_harder, ms, us); + +read_attribute(btree_nodes); +read_attribute(btree_used_percent); +read_attribute(average_key_size); +read_attribute(dirty_data); +read_attribute(bset_tree_stats); + +read_attribute(state); +read_attribute(cache_read_races); +read_attribute(writeback_keys_done); +read_attribute(writeback_keys_failed); +read_attribute(io_errors); +read_attribute(congested); +rw_attribute(congested_read_threshold_us); +rw_attribute(congested_write_threshold_us); + +rw_attribute(sequential_cutoff); +rw_attribute(sequential_merge); +rw_attribute(data_csum); +rw_attribute(cache_mode); +rw_attribute(writeback_metadata); +rw_attribute(writeback_running); +rw_attribute(writeback_percent); +rw_attribute(writeback_delay); +rw_attribute(writeback_rate); + +rw_attribute(writeback_rate_update_seconds); +rw_attribute(writeback_rate_d_term); +rw_attribute(writeback_rate_p_term_inverse); +rw_attribute(writeback_rate_d_smooth); +read_attribute(writeback_rate_debug); + +rw_attribute(synchronous); +rw_attribute(journal_delay_ms); +rw_attribute(discard); +rw_attribute(running); +rw_attribute(label); +rw_attribute(readahead); +rw_attribute(io_error_limit); +rw_attribute(io_error_halflife); +rw_attribute(verify); +rw_attribute(key_merging_disabled); +rw_attribute(gc_always_rewrite); +rw_attribute(freelist_percent); +rw_attribute(cache_replacement_policy); +rw_attribute(btree_shrinker_disabled); +rw_attribute(copy_gc_enabled); +rw_attribute(size); + +SHOW(__bch_cached_dev) +{ + struct cached_dev *dc = container_of(kobj, struct cached_dev, + disk.kobj); + const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; + +#define var(stat) (dc->stat) + + if (attr == &sysfs_cache_mode) + return bch_snprint_string_list(buf, PAGE_SIZE, + bch_cache_modes + 1, + BDEV_CACHE_MODE(&dc->sb)); + + sysfs_printf(data_csum, "%i", dc->disk.data_csum); + var_printf(verify, "%i"); + var_printf(writeback_metadata, "%i"); + var_printf(writeback_running, "%i"); + var_print(writeback_delay); + var_print(writeback_percent); + sysfs_print(writeback_rate, dc->writeback_rate.rate); + + var_print(writeback_rate_update_seconds); + var_print(writeback_rate_d_term); + var_print(writeback_rate_p_term_inverse); + var_print(writeback_rate_d_smooth); + + if (attr == &sysfs_writeback_rate_debug) { + char dirty[20]; + char derivative[20]; + char target[20]; + bch_hprint(dirty, + atomic_long_read(&dc->disk.sectors_dirty) << 9); + bch_hprint(derivative, dc->writeback_rate_derivative << 9); + bch_hprint(target, dc->writeback_rate_target << 9); + + return sprintf(buf, + "rate:\t\t%u\n" + "change:\t\t%i\n" + "dirty:\t\t%s\n" + "derivative:\t%s\n" + "target:\t\t%s\n", + dc->writeback_rate.rate, + dc->writeback_rate_change, + dirty, derivative, target); + } + + sysfs_hprint(dirty_data, + atomic_long_read(&dc->disk.sectors_dirty) << 9); + + var_printf(sequential_merge, "%i"); + var_hprint(sequential_cutoff); + var_hprint(readahead); + + sysfs_print(running, atomic_read(&dc->running)); + sysfs_print(state, states[BDEV_STATE(&dc->sb)]); + + if (attr == &sysfs_label) { + memcpy(buf, dc->sb.label, SB_LABEL_SIZE); + buf[SB_LABEL_SIZE + 1] = '\0'; + strcat(buf, "\n"); + return strlen(buf); + } + +#undef var + return 0; +} +SHOW_LOCKED(bch_cached_dev) + +STORE(__cached_dev) +{ + struct cached_dev *dc = container_of(kobj, struct cached_dev, + disk.kobj); + unsigned v = size; + struct cache_set *c; + +#define d_strtoul(var) sysfs_strtoul(var, dc->var) +#define d_strtoi_h(var) sysfs_hatoi(var, dc->var) + + sysfs_strtoul(data_csum, dc->disk.data_csum); + d_strtoul(verify); + d_strtoul(writeback_metadata); + d_strtoul(writeback_running); + d_strtoul(writeback_delay); + sysfs_strtoul_clamp(writeback_rate, + dc->writeback_rate.rate, 1, 1000000); + sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); + + d_strtoul(writeback_rate_update_seconds); + d_strtoul(writeback_rate_d_term); + d_strtoul(writeback_rate_p_term_inverse); + sysfs_strtoul_clamp(writeback_rate_p_term_inverse, + dc->writeback_rate_p_term_inverse, 1, INT_MAX); + d_strtoul(writeback_rate_d_smooth); + + d_strtoul(sequential_merge); + d_strtoi_h(sequential_cutoff); + d_strtoi_h(readahead); + + if (attr == &sysfs_clear_stats) + bch_cache_accounting_clear(&dc->accounting); + + if (attr == &sysfs_running && + strtoul_or_return(buf)) + bch_cached_dev_run(dc); + + if (attr == &sysfs_cache_mode) { + ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1); + + if (v < 0) + return v; + + if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) { + SET_BDEV_CACHE_MODE(&dc->sb, v); + bch_write_bdev_super(dc, NULL); + } + } + + if (attr == &sysfs_label) { + memcpy(dc->sb.label, buf, SB_LABEL_SIZE); + bch_write_bdev_super(dc, NULL); + if (dc->disk.c) { + memcpy(dc->disk.c->uuids[dc->disk.id].label, + buf, SB_LABEL_SIZE); + bch_uuid_write(dc->disk.c); + } + } + + if (attr == &sysfs_attach) { + if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) + return -EINVAL; + + list_for_each_entry(c, &bch_cache_sets, list) { + v = bch_cached_dev_attach(dc, c); + if (!v) + return size; + } + + pr_err("Can't attach %s: cache set not found", buf); + size = v; + } + + if (attr == &sysfs_detach && dc->disk.c) + bch_cached_dev_detach(dc); + + if (attr == &sysfs_stop) + bcache_device_stop(&dc->disk); + + return size; +} + +STORE(bch_cached_dev) +{ + struct cached_dev *dc = container_of(kobj, struct cached_dev, + disk.kobj); + + mutex_lock(&bch_register_lock); + size = __cached_dev_store(kobj, attr, buf, size); + + if (attr == &sysfs_writeback_running) + bch_writeback_queue(dc); + + if (attr == &sysfs_writeback_percent) + schedule_delayed_work(&dc->writeback_rate_update, + dc->writeback_rate_update_seconds * HZ); + + mutex_unlock(&bch_register_lock); + return size; +} + +static struct attribute *bch_cached_dev_files[] = { + &sysfs_attach, + &sysfs_detach, + &sysfs_stop, +#if 0 + &sysfs_data_csum, +#endif + &sysfs_cache_mode, + &sysfs_writeback_metadata, + &sysfs_writeback_running, + &sysfs_writeback_delay, + &sysfs_writeback_percent, + &sysfs_writeback_rate, + &sysfs_writeback_rate_update_seconds, + &sysfs_writeback_rate_d_term, + &sysfs_writeback_rate_p_term_inverse, + &sysfs_writeback_rate_d_smooth, + &sysfs_writeback_rate_debug, + &sysfs_dirty_data, + &sysfs_sequential_cutoff, + &sysfs_sequential_merge, + &sysfs_clear_stats, + &sysfs_running, + &sysfs_state, + &sysfs_label, + &sysfs_readahead, +#ifdef CONFIG_BCACHE_DEBUG + &sysfs_verify, +#endif + NULL +}; +KTYPE(bch_cached_dev); + +SHOW(bch_flash_dev) +{ + struct bcache_device *d = container_of(kobj, struct bcache_device, + kobj); + struct uuid_entry *u = &d->c->uuids[d->id]; + + sysfs_printf(data_csum, "%i", d->data_csum); + sysfs_hprint(size, u->sectors << 9); + + if (attr == &sysfs_label) { + memcpy(buf, u->label, SB_LABEL_SIZE); + buf[SB_LABEL_SIZE + 1] = '\0'; + strcat(buf, "\n"); + return strlen(buf); + } + + return 0; +} + +STORE(__bch_flash_dev) +{ + struct bcache_device *d = container_of(kobj, struct bcache_device, + kobj); + struct uuid_entry *u = &d->c->uuids[d->id]; + + sysfs_strtoul(data_csum, d->data_csum); + + if (attr == &sysfs_size) { + uint64_t v; + strtoi_h_or_return(buf, v); + + u->sectors = v >> 9; + bch_uuid_write(d->c); + set_capacity(d->disk, u->sectors); + } + + if (attr == &sysfs_label) { + memcpy(u->label, buf, SB_LABEL_SIZE); + bch_uuid_write(d->c); + } + + if (attr == &sysfs_unregister) { + atomic_set(&d->detaching, 1); + bcache_device_stop(d); + } + + return size; +} +STORE_LOCKED(bch_flash_dev) + +static struct attribute *bch_flash_dev_files[] = { + &sysfs_unregister, +#if 0 + &sysfs_data_csum, +#endif + &sysfs_label, + &sysfs_size, + NULL +}; +KTYPE(bch_flash_dev); + +SHOW(__bch_cache_set) +{ + unsigned root_usage(struct cache_set *c) + { + unsigned bytes = 0; + struct bkey *k; + struct btree *b; + struct btree_iter iter; + + goto lock_root; + + do { + rw_unlock(false, b); +lock_root: + b = c->root; + rw_lock(false, b, b->level); + } while (b != c->root); + + for_each_key_filter(b, k, &iter, bch_ptr_bad) + bytes += bkey_bytes(k); + + rw_unlock(false, b); + + return (bytes * 100) / btree_bytes(c); + } + + size_t cache_size(struct cache_set *c) + { + size_t ret = 0; + struct btree *b; + + mutex_lock(&c->bucket_lock); + list_for_each_entry(b, &c->btree_cache, list) + ret += 1 << (b->page_order + PAGE_SHIFT); + + mutex_unlock(&c->bucket_lock); + return ret; + } + + unsigned cache_max_chain(struct cache_set *c) + { + unsigned ret = 0; + struct hlist_head *h; + + mutex_lock(&c->bucket_lock); + + for (h = c->bucket_hash; + h < c->bucket_hash + (1 << BUCKET_HASH_BITS); + h++) { + unsigned i = 0; + struct hlist_node *p; + + hlist_for_each(p, h) + i++; + + ret = max(ret, i); + } + + mutex_unlock(&c->bucket_lock); + return ret; + } + + unsigned btree_used(struct cache_set *c) + { + return div64_u64(c->gc_stats.key_bytes * 100, + (c->gc_stats.nodes ?: 1) * btree_bytes(c)); + } + + unsigned average_key_size(struct cache_set *c) + { + return c->gc_stats.nkeys + ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) + : 0; + } + + struct cache_set *c = container_of(kobj, struct cache_set, kobj); + + sysfs_print(synchronous, CACHE_SYNC(&c->sb)); + sysfs_print(journal_delay_ms, c->journal_delay_ms); + sysfs_hprint(bucket_size, bucket_bytes(c)); + sysfs_hprint(block_size, block_bytes(c)); + sysfs_print(tree_depth, c->root->level); + sysfs_print(root_usage_percent, root_usage(c)); + + sysfs_hprint(btree_cache_size, cache_size(c)); + sysfs_print(btree_cache_max_chain, cache_max_chain(c)); + sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); + + sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); + sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); + sysfs_print_time_stats(&c->sort_time, btree_sort, ms, us); + sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); + sysfs_print_time_stats(&c->try_harder_time, try_harder, ms, us); + + sysfs_print(btree_used_percent, btree_used(c)); + sysfs_print(btree_nodes, c->gc_stats.nodes); + sysfs_hprint(dirty_data, c->gc_stats.dirty); + sysfs_hprint(average_key_size, average_key_size(c)); + + sysfs_print(cache_read_races, + atomic_long_read(&c->cache_read_races)); + + sysfs_print(writeback_keys_done, + atomic_long_read(&c->writeback_keys_done)); + sysfs_print(writeback_keys_failed, + atomic_long_read(&c->writeback_keys_failed)); + + /* See count_io_errors for why 88 */ + sysfs_print(io_error_halflife, c->error_decay * 88); + sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); + + sysfs_hprint(congested, + ((uint64_t) bch_get_congested(c)) << 9); + sysfs_print(congested_read_threshold_us, + c->congested_read_threshold_us); + sysfs_print(congested_write_threshold_us, + c->congested_write_threshold_us); + + sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); + sysfs_printf(verify, "%i", c->verify); + sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); + sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); + sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); + sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); + + if (attr == &sysfs_bset_tree_stats) + return bch_bset_print_stats(c, buf); + + return 0; +} +SHOW_LOCKED(bch_cache_set) + +STORE(__bch_cache_set) +{ + struct cache_set *c = container_of(kobj, struct cache_set, kobj); + + if (attr == &sysfs_unregister) + bch_cache_set_unregister(c); + + if (attr == &sysfs_stop) + bch_cache_set_stop(c); + + if (attr == &sysfs_synchronous) { + bool sync = strtoul_or_return(buf); + + if (sync != CACHE_SYNC(&c->sb)) { + SET_CACHE_SYNC(&c->sb, sync); + bcache_write_super(c); + } + } + + if (attr == &sysfs_flash_vol_create) { + int r; + uint64_t v; + strtoi_h_or_return(buf, v); + + r = bch_flash_dev_create(c, v); + if (r) + return r; + } + + if (attr == &sysfs_clear_stats) { + atomic_long_set(&c->writeback_keys_done, 0); + atomic_long_set(&c->writeback_keys_failed, 0); + + memset(&c->gc_stats, 0, sizeof(struct gc_stat)); + bch_cache_accounting_clear(&c->accounting); + } + + if (attr == &sysfs_trigger_gc) + bch_queue_gc(c); + + if (attr == &sysfs_prune_cache) { + struct shrink_control sc; + sc.gfp_mask = GFP_KERNEL; + sc.nr_to_scan = strtoul_or_return(buf); + c->shrink.shrink(&c->shrink, &sc); + } + + sysfs_strtoul(congested_read_threshold_us, + c->congested_read_threshold_us); + sysfs_strtoul(congested_write_threshold_us, + c->congested_write_threshold_us); + + if (attr == &sysfs_io_error_limit) + c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; + + /* See count_io_errors() for why 88 */ + if (attr == &sysfs_io_error_halflife) + c->error_decay = strtoul_or_return(buf) / 88; + + sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); + sysfs_strtoul(verify, c->verify); + sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); + sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); + sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); + sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); + + return size; +} +STORE_LOCKED(bch_cache_set) + +SHOW(bch_cache_set_internal) +{ + struct cache_set *c = container_of(kobj, struct cache_set, internal); + return bch_cache_set_show(&c->kobj, attr, buf); +} + +STORE(bch_cache_set_internal) +{ + struct cache_set *c = container_of(kobj, struct cache_set, internal); + return bch_cache_set_store(&c->kobj, attr, buf, size); +} + +static void bch_cache_set_internal_release(struct kobject *k) +{ +} + +static struct attribute *bch_cache_set_files[] = { + &sysfs_unregister, + &sysfs_stop, + &sysfs_synchronous, + &sysfs_journal_delay_ms, + &sysfs_flash_vol_create, + + &sysfs_bucket_size, + &sysfs_block_size, + &sysfs_tree_depth, + &sysfs_root_usage_percent, + &sysfs_btree_cache_size, + &sysfs_cache_available_percent, + + &sysfs_average_key_size, + &sysfs_dirty_data, + + &sysfs_io_error_limit, + &sysfs_io_error_halflife, + &sysfs_congested, + &sysfs_congested_read_threshold_us, + &sysfs_congested_write_threshold_us, + &sysfs_clear_stats, + NULL +}; +KTYPE(bch_cache_set); + +static struct attribute *bch_cache_set_internal_files[] = { + &sysfs_active_journal_entries, + + sysfs_time_stats_attribute_list(btree_gc, sec, ms) + sysfs_time_stats_attribute_list(btree_split, sec, us) + sysfs_time_stats_attribute_list(btree_sort, ms, us) + sysfs_time_stats_attribute_list(btree_read, ms, us) + sysfs_time_stats_attribute_list(try_harder, ms, us) + + &sysfs_btree_nodes, + &sysfs_btree_used_percent, + &sysfs_btree_cache_max_chain, + + &sysfs_bset_tree_stats, + &sysfs_cache_read_races, + &sysfs_writeback_keys_done, + &sysfs_writeback_keys_failed, + + &sysfs_trigger_gc, + &sysfs_prune_cache, +#ifdef CONFIG_BCACHE_DEBUG + &sysfs_verify, + &sysfs_key_merging_disabled, +#endif + &sysfs_gc_always_rewrite, + &sysfs_btree_shrinker_disabled, + &sysfs_copy_gc_enabled, + NULL +}; +KTYPE(bch_cache_set_internal); + +SHOW(__bch_cache) +{ + struct cache *ca = container_of(kobj, struct cache, kobj); + + sysfs_hprint(bucket_size, bucket_bytes(ca)); + sysfs_hprint(block_size, block_bytes(ca)); + sysfs_print(nbuckets, ca->sb.nbuckets); + sysfs_print(discard, ca->discard); + sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); + sysfs_hprint(btree_written, + atomic_long_read(&ca->btree_sectors_written) << 9); + sysfs_hprint(metadata_written, + (atomic_long_read(&ca->meta_sectors_written) + + atomic_long_read(&ca->btree_sectors_written)) << 9); + + sysfs_print(io_errors, + atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); + + sysfs_print(freelist_percent, ca->free.size * 100 / + ((size_t) ca->sb.nbuckets)); + + if (attr == &sysfs_cache_replacement_policy) + return bch_snprint_string_list(buf, PAGE_SIZE, + cache_replacement_policies, + CACHE_REPLACEMENT(&ca->sb)); + + if (attr == &sysfs_priority_stats) { + int cmp(const void *l, const void *r) + { return *((uint16_t *) r) - *((uint16_t *) l); } + + /* Number of quantiles we compute */ + const unsigned nq = 31; + + size_t n = ca->sb.nbuckets, i, unused, btree; + uint64_t sum = 0; + uint16_t q[nq], *p, *cached; + ssize_t ret; + + cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t)); + if (!p) + return -ENOMEM; + + mutex_lock(&ca->set->bucket_lock); + for (i = ca->sb.first_bucket; i < n; i++) + p[i] = ca->buckets[i].prio; + mutex_unlock(&ca->set->bucket_lock); + + sort(p, n, sizeof(uint16_t), cmp, NULL); + + while (n && + !cached[n - 1]) + --n; + + unused = ca->sb.nbuckets - n; + + while (cached < p + n && + *cached == BTREE_PRIO) + cached++; + + btree = cached - p; + n -= btree; + + for (i = 0; i < n; i++) + sum += INITIAL_PRIO - cached[i]; + + if (n) + do_div(sum, n); + + for (i = 0; i < nq; i++) + q[i] = INITIAL_PRIO - cached[n * (i + 1) / (nq + 1)]; + + vfree(p); + + ret = snprintf(buf, PAGE_SIZE, + "Unused: %zu%%\n" + "Metadata: %zu%%\n" + "Average: %llu\n" + "Sectors per Q: %zu\n" + "Quantiles: [", + unused * 100 / (size_t) ca->sb.nbuckets, + btree * 100 / (size_t) ca->sb.nbuckets, sum, + n * ca->sb.bucket_size / (nq + 1)); + + for (i = 0; i < nq && ret < (ssize_t) PAGE_SIZE; i++) + ret += snprintf(buf + ret, PAGE_SIZE - ret, + i < nq - 1 ? "%u " : "%u]\n", q[i]); + + buf[PAGE_SIZE - 1] = '\0'; + return ret; + } + + return 0; +} +SHOW_LOCKED(bch_cache) + +STORE(__bch_cache) +{ + struct cache *ca = container_of(kobj, struct cache, kobj); + + if (attr == &sysfs_discard) { + bool v = strtoul_or_return(buf); + + if (blk_queue_discard(bdev_get_queue(ca->bdev))) + ca->discard = v; + + if (v != CACHE_DISCARD(&ca->sb)) { + SET_CACHE_DISCARD(&ca->sb, v); + bcache_write_super(ca->set); + } + } + + if (attr == &sysfs_cache_replacement_policy) { + ssize_t v = bch_read_string_list(buf, cache_replacement_policies); + + if (v < 0) + return v; + + if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { + mutex_lock(&ca->set->bucket_lock); + SET_CACHE_REPLACEMENT(&ca->sb, v); + mutex_unlock(&ca->set->bucket_lock); + + bcache_write_super(ca->set); + } + } + + if (attr == &sysfs_freelist_percent) { + DECLARE_FIFO(long, free); + long i; + size_t p = strtoul_or_return(buf); + + p = clamp_t(size_t, + ((size_t) ca->sb.nbuckets * p) / 100, + roundup_pow_of_two(ca->sb.nbuckets) >> 9, + ca->sb.nbuckets / 2); + + if (!init_fifo_exact(&free, p, GFP_KERNEL)) + return -ENOMEM; + + mutex_lock(&ca->set->bucket_lock); + + fifo_move(&free, &ca->free); + fifo_swap(&free, &ca->free); + + mutex_unlock(&ca->set->bucket_lock); + + while (fifo_pop(&free, i)) + atomic_dec(&ca->buckets[i].pin); + + free_fifo(&free); + } + + if (attr == &sysfs_clear_stats) { + atomic_long_set(&ca->sectors_written, 0); + atomic_long_set(&ca->btree_sectors_written, 0); + atomic_long_set(&ca->meta_sectors_written, 0); + atomic_set(&ca->io_count, 0); + atomic_set(&ca->io_errors, 0); + } + + return size; +} +STORE_LOCKED(bch_cache) + +static struct attribute *bch_cache_files[] = { + &sysfs_bucket_size, + &sysfs_block_size, + &sysfs_nbuckets, + &sysfs_priority_stats, + &sysfs_discard, + &sysfs_written, + &sysfs_btree_written, + &sysfs_metadata_written, + &sysfs_io_errors, + &sysfs_clear_stats, + &sysfs_freelist_percent, + &sysfs_cache_replacement_policy, + NULL +}; +KTYPE(bch_cache); |