| /* |
| * 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 "writeback.h" |
| |
| #include <linux/blkdev.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); |
| |
| read_attribute(stripe_size); |
| read_attribute(partial_stripes_expensive); |
| |
| 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, |
| bcache_dev_sectors_dirty(&dc->disk) << 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, |
| bcache_dev_sectors_dirty(&dc->disk) << 9); |
| |
| sysfs_hprint(stripe_size, (1 << dc->disk.stripe_size_bits) << 9); |
| var_printf(partial_stripes_expensive, "%u"); |
| |
| 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_stripe_size, |
| &sysfs_partial_stripes_expensive, |
| &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); } |
| |
| size_t n = ca->sb.nbuckets, i, unused, btree; |
| uint64_t sum = 0; |
| /* Compute 31 quantiles */ |
| uint16_t q[31], *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 < ARRAY_SIZE(q); i++) |
| q[i] = INITIAL_PRIO - cached[n * (i + 1) / |
| (ARRAY_SIZE(q) + 1)]; |
| |
| vfree(p); |
| |
| ret = scnprintf(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 / (ARRAY_SIZE(q) + 1)); |
| |
| for (i = 0; i < ARRAY_SIZE(q); i++) |
| ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
| "%u ", q[i]); |
| ret--; |
| |
| ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); |
| |
| 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); |