| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * 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 "features.h" |
| |
| #include <linux/blkdev.h> |
| #include <linux/sort.h> |
| #include <linux/sched/clock.h> |
| |
| extern bool bcache_is_reboot; |
| |
| /* Default is 0 ("writethrough") */ |
| static const char * const bch_cache_modes[] = { |
| "writethrough", |
| "writeback", |
| "writearound", |
| "none", |
| NULL |
| }; |
| |
| static const char * const bch_reada_cache_policies[] = { |
| "all", |
| "meta-only", |
| NULL |
| }; |
| |
| /* Default is 0 ("auto") */ |
| static const char * const bch_stop_on_failure_modes[] = { |
| "auto", |
| "always", |
| NULL |
| }; |
| |
| static const char * const cache_replacement_policies[] = { |
| "lru", |
| "fifo", |
| "random", |
| NULL |
| }; |
| |
| static const char * const error_actions[] = { |
| "unregister", |
| "panic", |
| 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); |
| read_attribute(backing_dev_name); |
| read_attribute(backing_dev_uuid); |
| |
| 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); |
| |
| 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(feature_compat); |
| read_attribute(feature_ro_compat); |
| read_attribute(feature_incompat); |
| |
| read_attribute(state); |
| read_attribute(cache_read_races); |
| read_attribute(reclaim); |
| read_attribute(reclaimed_journal_buckets); |
| read_attribute(flush_write); |
| read_attribute(writeback_keys_done); |
| read_attribute(writeback_keys_failed); |
| read_attribute(io_errors); |
| read_attribute(congested); |
| read_attribute(cutoff_writeback); |
| read_attribute(cutoff_writeback_sync); |
| rw_attribute(congested_read_threshold_us); |
| rw_attribute(congested_write_threshold_us); |
| |
| rw_attribute(sequential_cutoff); |
| rw_attribute(data_csum); |
| rw_attribute(cache_mode); |
| rw_attribute(readahead_cache_policy); |
| rw_attribute(stop_when_cache_set_failed); |
| rw_attribute(writeback_metadata); |
| rw_attribute(writeback_running); |
| rw_attribute(writeback_percent); |
| rw_attribute(writeback_delay); |
| rw_attribute(writeback_rate); |
| rw_attribute(writeback_consider_fragment); |
| |
| rw_attribute(writeback_rate_update_seconds); |
| rw_attribute(writeback_rate_i_term_inverse); |
| rw_attribute(writeback_rate_p_term_inverse); |
| rw_attribute(writeback_rate_fp_term_low); |
| rw_attribute(writeback_rate_fp_term_mid); |
| rw_attribute(writeback_rate_fp_term_high); |
| rw_attribute(writeback_rate_minimum); |
| read_attribute(writeback_rate_debug); |
| |
| read_attribute(stripe_size); |
| read_attribute(partial_stripes_expensive); |
| |
| rw_attribute(synchronous); |
| rw_attribute(journal_delay_ms); |
| rw_attribute(io_disable); |
| rw_attribute(discard); |
| rw_attribute(running); |
| rw_attribute(label); |
| rw_attribute(errors); |
| rw_attribute(io_error_limit); |
| rw_attribute(io_error_halflife); |
| rw_attribute(verify); |
| rw_attribute(bypass_torture_test); |
| rw_attribute(key_merging_disabled); |
| rw_attribute(gc_always_rewrite); |
| rw_attribute(expensive_debug_checks); |
| rw_attribute(cache_replacement_policy); |
| rw_attribute(btree_shrinker_disabled); |
| rw_attribute(copy_gc_enabled); |
| rw_attribute(idle_max_writeback_rate); |
| rw_attribute(gc_after_writeback); |
| rw_attribute(size); |
| |
| static ssize_t bch_snprint_string_list(char *buf, |
| size_t size, |
| const char * const list[], |
| size_t selected) |
| { |
| char *out = buf; |
| size_t i; |
| |
| for (i = 0; list[i]; i++) |
| out += scnprintf(out, buf + size - out, |
| i == selected ? "[%s] " : "%s ", list[i]); |
| |
| out[-1] = '\n'; |
| return out - buf; |
| } |
| |
| SHOW(__bch_cached_dev) |
| { |
| struct cached_dev *dc = container_of(kobj, struct cached_dev, |
| disk.kobj); |
| char const *states[] = { "no cache", "clean", "dirty", "inconsistent" }; |
| int wb = dc->writeback_running; |
| |
| #define var(stat) (dc->stat) |
| |
| if (attr == &sysfs_cache_mode) |
| return bch_snprint_string_list(buf, PAGE_SIZE, |
| bch_cache_modes, |
| BDEV_CACHE_MODE(&dc->sb)); |
| |
| if (attr == &sysfs_readahead_cache_policy) |
| return bch_snprint_string_list(buf, PAGE_SIZE, |
| bch_reada_cache_policies, |
| dc->cache_readahead_policy); |
| |
| if (attr == &sysfs_stop_when_cache_set_failed) |
| return bch_snprint_string_list(buf, PAGE_SIZE, |
| bch_stop_on_failure_modes, |
| dc->stop_when_cache_set_failed); |
| |
| |
| sysfs_printf(data_csum, "%i", dc->disk.data_csum); |
| var_printf(verify, "%i"); |
| var_printf(bypass_torture_test, "%i"); |
| var_printf(writeback_metadata, "%i"); |
| var_printf(writeback_running, "%i"); |
| var_printf(writeback_consider_fragment, "%i"); |
| var_print(writeback_delay); |
| var_print(writeback_percent); |
| sysfs_hprint(writeback_rate, |
| wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0); |
| sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors)); |
| sysfs_printf(io_error_limit, "%i", dc->error_limit); |
| sysfs_printf(io_disable, "%i", dc->io_disable); |
| var_print(writeback_rate_update_seconds); |
| var_print(writeback_rate_i_term_inverse); |
| var_print(writeback_rate_p_term_inverse); |
| var_print(writeback_rate_fp_term_low); |
| var_print(writeback_rate_fp_term_mid); |
| var_print(writeback_rate_fp_term_high); |
| var_print(writeback_rate_minimum); |
| |
| if (attr == &sysfs_writeback_rate_debug) { |
| char rate[20]; |
| char dirty[20]; |
| char target[20]; |
| char proportional[20]; |
| char integral[20]; |
| char change[20]; |
| s64 next_io; |
| |
| /* |
| * Except for dirty and target, other values should |
| * be 0 if writeback is not running. |
| */ |
| bch_hprint(rate, |
| wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 |
| : 0); |
| bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); |
| bch_hprint(target, dc->writeback_rate_target << 9); |
| bch_hprint(proportional, |
| wb ? dc->writeback_rate_proportional << 9 : 0); |
| bch_hprint(integral, |
| wb ? dc->writeback_rate_integral_scaled << 9 : 0); |
| bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0); |
| next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(), |
| NSEC_PER_MSEC) : 0; |
| |
| return sprintf(buf, |
| "rate:\t\t%s/sec\n" |
| "dirty:\t\t%s\n" |
| "target:\t\t%s\n" |
| "proportional:\t%s\n" |
| "integral:\t%s\n" |
| "change:\t\t%s/sec\n" |
| "next io:\t%llims\n", |
| rate, dirty, target, proportional, |
| integral, change, next_io); |
| } |
| |
| sysfs_hprint(dirty_data, |
| bcache_dev_sectors_dirty(&dc->disk) << 9); |
| |
| sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9); |
| var_printf(partial_stripes_expensive, "%u"); |
| |
| var_hprint(sequential_cutoff); |
| |
| 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); |
| } |
| |
| if (attr == &sysfs_backing_dev_name) { |
| snprintf(buf, BDEVNAME_SIZE + 1, "%pg", dc->bdev); |
| strcat(buf, "\n"); |
| return strlen(buf); |
| } |
| |
| if (attr == &sysfs_backing_dev_uuid) { |
| /* convert binary uuid into 36-byte string plus '\0' */ |
| snprintf(buf, 36+1, "%pU", dc->sb.uuid); |
| 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); |
| ssize_t v; |
| struct cache_set *c; |
| struct kobj_uevent_env *env; |
| |
| /* no user space access if system is rebooting */ |
| if (bcache_is_reboot) |
| return -EBUSY; |
| |
| #define d_strtoul(var) sysfs_strtoul(var, dc->var) |
| #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) |
| #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) |
| |
| sysfs_strtoul(data_csum, dc->disk.data_csum); |
| d_strtoul(verify); |
| sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test); |
| sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata); |
| sysfs_strtoul_bool(writeback_running, dc->writeback_running); |
| sysfs_strtoul_bool(writeback_consider_fragment, dc->writeback_consider_fragment); |
| sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX); |
| |
| sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, |
| 0, bch_cutoff_writeback); |
| |
| if (attr == &sysfs_writeback_rate) { |
| ssize_t ret; |
| long int v = atomic_long_read(&dc->writeback_rate.rate); |
| |
| ret = strtoul_safe_clamp(buf, v, 1, INT_MAX); |
| |
| if (!ret) { |
| atomic_long_set(&dc->writeback_rate.rate, v); |
| ret = size; |
| } |
| |
| return ret; |
| } |
| |
| sysfs_strtoul_clamp(writeback_rate_update_seconds, |
| dc->writeback_rate_update_seconds, |
| 1, WRITEBACK_RATE_UPDATE_SECS_MAX); |
| sysfs_strtoul_clamp(writeback_rate_i_term_inverse, |
| dc->writeback_rate_i_term_inverse, |
| 1, UINT_MAX); |
| sysfs_strtoul_clamp(writeback_rate_p_term_inverse, |
| dc->writeback_rate_p_term_inverse, |
| 1, UINT_MAX); |
| sysfs_strtoul_clamp(writeback_rate_fp_term_low, |
| dc->writeback_rate_fp_term_low, |
| 1, dc->writeback_rate_fp_term_mid - 1); |
| sysfs_strtoul_clamp(writeback_rate_fp_term_mid, |
| dc->writeback_rate_fp_term_mid, |
| dc->writeback_rate_fp_term_low + 1, |
| dc->writeback_rate_fp_term_high - 1); |
| sysfs_strtoul_clamp(writeback_rate_fp_term_high, |
| dc->writeback_rate_fp_term_high, |
| dc->writeback_rate_fp_term_mid + 1, UINT_MAX); |
| sysfs_strtoul_clamp(writeback_rate_minimum, |
| dc->writeback_rate_minimum, |
| 1, UINT_MAX); |
| |
| sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX); |
| |
| if (attr == &sysfs_io_disable) { |
| int v = strtoul_or_return(buf); |
| |
| dc->io_disable = v ? 1 : 0; |
| } |
| |
| sysfs_strtoul_clamp(sequential_cutoff, |
| dc->sequential_cutoff, |
| 0, UINT_MAX); |
| |
| if (attr == &sysfs_clear_stats) |
| bch_cache_accounting_clear(&dc->accounting); |
| |
| if (attr == &sysfs_running && |
| strtoul_or_return(buf)) { |
| v = bch_cached_dev_run(dc); |
| if (v) |
| return v; |
| } |
| |
| if (attr == &sysfs_cache_mode) { |
| v = __sysfs_match_string(bch_cache_modes, -1, buf); |
| if (v < 0) |
| return v; |
| |
| if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) { |
| SET_BDEV_CACHE_MODE(&dc->sb, v); |
| bch_write_bdev_super(dc, NULL); |
| } |
| } |
| |
| if (attr == &sysfs_readahead_cache_policy) { |
| v = __sysfs_match_string(bch_reada_cache_policies, -1, buf); |
| if (v < 0) |
| return v; |
| |
| if ((unsigned int) v != dc->cache_readahead_policy) |
| dc->cache_readahead_policy = v; |
| } |
| |
| if (attr == &sysfs_stop_when_cache_set_failed) { |
| v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); |
| if (v < 0) |
| return v; |
| |
| dc->stop_when_cache_set_failed = v; |
| } |
| |
| if (attr == &sysfs_label) { |
| if (size > SB_LABEL_SIZE) |
| return -EINVAL; |
| memcpy(dc->sb.label, buf, size); |
| if (size < SB_LABEL_SIZE) |
| dc->sb.label[size] = '\0'; |
| if (size && dc->sb.label[size - 1] == '\n') |
| dc->sb.label[size - 1] = '\0'; |
| 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); |
| } |
| env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
| if (!env) |
| return -ENOMEM; |
| add_uevent_var(env, "DRIVER=bcache"); |
| add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid); |
| add_uevent_var(env, "CACHED_LABEL=%s", buf); |
| kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj, |
| KOBJ_CHANGE, |
| env->envp); |
| kfree(env); |
| } |
| |
| if (attr == &sysfs_attach) { |
| uint8_t set_uuid[16]; |
| |
| if (bch_parse_uuid(buf, set_uuid) < 16) |
| return -EINVAL; |
| |
| v = -ENOENT; |
| list_for_each_entry(c, &bch_cache_sets, list) { |
| v = bch_cached_dev_attach(dc, c, set_uuid); |
| if (!v) |
| return size; |
| } |
| if (v == -ENOENT) |
| pr_err("Can't attach %s: cache set not found\n", buf); |
| return 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); |
| |
| /* no user space access if system is rebooting */ |
| if (bcache_is_reboot) |
| return -EBUSY; |
| |
| mutex_lock(&bch_register_lock); |
| size = __cached_dev_store(kobj, attr, buf, size); |
| |
| if (attr == &sysfs_writeback_running) { |
| /* dc->writeback_running changed in __cached_dev_store() */ |
| if (IS_ERR_OR_NULL(dc->writeback_thread)) { |
| /* |
| * reject setting it to 1 via sysfs if writeback |
| * kthread is not created yet. |
| */ |
| if (dc->writeback_running) { |
| dc->writeback_running = false; |
| pr_err("%s: failed to run non-existent writeback thread\n", |
| dc->disk.disk->disk_name); |
| } |
| } else |
| /* |
| * writeback kthread will check if dc->writeback_running |
| * is true or false. |
| */ |
| bch_writeback_queue(dc); |
| } |
| |
| /* |
| * Only set BCACHE_DEV_WB_RUNNING when cached device attached to |
| * a cache set, otherwise it doesn't make sense. |
| */ |
| if (attr == &sysfs_writeback_percent) |
| if ((dc->disk.c != NULL) && |
| (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))) |
| 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_attrs[] = { |
| &sysfs_attach, |
| &sysfs_detach, |
| &sysfs_stop, |
| #if 0 |
| &sysfs_data_csum, |
| #endif |
| &sysfs_cache_mode, |
| &sysfs_readahead_cache_policy, |
| &sysfs_stop_when_cache_set_failed, |
| &sysfs_writeback_metadata, |
| &sysfs_writeback_running, |
| &sysfs_writeback_delay, |
| &sysfs_writeback_percent, |
| &sysfs_writeback_rate, |
| &sysfs_writeback_consider_fragment, |
| &sysfs_writeback_rate_update_seconds, |
| &sysfs_writeback_rate_i_term_inverse, |
| &sysfs_writeback_rate_p_term_inverse, |
| &sysfs_writeback_rate_fp_term_low, |
| &sysfs_writeback_rate_fp_term_mid, |
| &sysfs_writeback_rate_fp_term_high, |
| &sysfs_writeback_rate_minimum, |
| &sysfs_writeback_rate_debug, |
| &sysfs_io_errors, |
| &sysfs_io_error_limit, |
| &sysfs_io_disable, |
| &sysfs_dirty_data, |
| &sysfs_stripe_size, |
| &sysfs_partial_stripes_expensive, |
| &sysfs_sequential_cutoff, |
| &sysfs_clear_stats, |
| &sysfs_running, |
| &sysfs_state, |
| &sysfs_label, |
| #ifdef CONFIG_BCACHE_DEBUG |
| &sysfs_verify, |
| &sysfs_bypass_torture_test, |
| #endif |
| &sysfs_backing_dev_name, |
| &sysfs_backing_dev_uuid, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(bch_cached_dev); |
| 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]; |
| |
| /* no user space access if system is rebooting */ |
| if (bcache_is_reboot) |
| return -EBUSY; |
| |
| 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) { |
| set_bit(BCACHE_DEV_DETACHING, &d->flags); |
| bcache_device_stop(d); |
| } |
| |
| return size; |
| } |
| STORE_LOCKED(bch_flash_dev) |
| |
| static struct attribute *bch_flash_dev_attrs[] = { |
| &sysfs_unregister, |
| #if 0 |
| &sysfs_data_csum, |
| #endif |
| &sysfs_label, |
| &sysfs_size, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(bch_flash_dev); |
| KTYPE(bch_flash_dev); |
| |
| struct bset_stats_op { |
| struct btree_op op; |
| size_t nodes; |
| struct bset_stats stats; |
| }; |
| |
| static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) |
| { |
| struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); |
| |
| op->nodes++; |
| bch_btree_keys_stats(&b->keys, &op->stats); |
| |
| return MAP_CONTINUE; |
| } |
| |
| static int bch_bset_print_stats(struct cache_set *c, char *buf) |
| { |
| struct bset_stats_op op; |
| int ret; |
| |
| memset(&op, 0, sizeof(op)); |
| bch_btree_op_init(&op.op, -1); |
| |
| ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); |
| if (ret < 0) |
| return ret; |
| |
| return snprintf(buf, PAGE_SIZE, |
| "btree nodes: %zu\n" |
| "written sets: %zu\n" |
| "unwritten sets: %zu\n" |
| "written key bytes: %zu\n" |
| "unwritten key bytes: %zu\n" |
| "floats: %zu\n" |
| "failed: %zu\n", |
| op.nodes, |
| op.stats.sets_written, op.stats.sets_unwritten, |
| op.stats.bytes_written, op.stats.bytes_unwritten, |
| op.stats.floats, op.stats.failed); |
| } |
| |
| static unsigned int bch_root_usage(struct cache_set *c) |
| { |
| unsigned int bytes = 0; |
| struct bkey *k; |
| struct btree *b; |
| struct btree_iter_stack 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->keys, k, &iter, bch_ptr_bad) |
| bytes += bkey_bytes(k); |
| |
| rw_unlock(false, b); |
| |
| return (bytes * 100) / btree_bytes(c); |
| } |
| |
| static size_t bch_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->keys.page_order + PAGE_SHIFT); |
| |
| mutex_unlock(&c->bucket_lock); |
| return ret; |
| } |
| |
| static unsigned int bch_cache_max_chain(struct cache_set *c) |
| { |
| unsigned int 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++) { |
| ret = max(ret, hlist_count_nodes(h)); |
| } |
| |
| mutex_unlock(&c->bucket_lock); |
| return ret; |
| } |
| |
| static unsigned int bch_btree_used(struct cache_set *c) |
| { |
| return div64_u64(c->gc_stats.key_bytes * 100, |
| (c->gc_stats.nodes ?: 1) * btree_bytes(c)); |
| } |
| |
| static unsigned int bch_average_key_size(struct cache_set *c) |
| { |
| return c->gc_stats.nkeys |
| ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) |
| : 0; |
| } |
| |
| SHOW(__bch_cache_set) |
| { |
| struct cache_set *c = container_of(kobj, struct cache_set, kobj); |
| |
| sysfs_print(synchronous, CACHE_SYNC(&c->cache->sb)); |
| sysfs_print(journal_delay_ms, c->journal_delay_ms); |
| sysfs_hprint(bucket_size, bucket_bytes(c->cache)); |
| sysfs_hprint(block_size, block_bytes(c->cache)); |
| sysfs_print(tree_depth, c->root->level); |
| sysfs_print(root_usage_percent, bch_root_usage(c)); |
| |
| sysfs_hprint(btree_cache_size, bch_cache_size(c)); |
| sysfs_print(btree_cache_max_chain, bch_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(btree_used_percent, bch_btree_used(c)); |
| sysfs_print(btree_nodes, c->gc_stats.nodes); |
| sysfs_hprint(average_key_size, bch_average_key_size(c)); |
| |
| sysfs_print(cache_read_races, |
| atomic_long_read(&c->cache_read_races)); |
| |
| sysfs_print(reclaim, |
| atomic_long_read(&c->reclaim)); |
| |
| sysfs_print(reclaimed_journal_buckets, |
| atomic_long_read(&c->reclaimed_journal_buckets)); |
| |
| sysfs_print(flush_write, |
| atomic_long_read(&c->flush_write)); |
| |
| sysfs_print(writeback_keys_done, |
| atomic_long_read(&c->writeback_keys_done)); |
| sysfs_print(writeback_keys_failed, |
| atomic_long_read(&c->writeback_keys_failed)); |
| |
| if (attr == &sysfs_errors) |
| return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, |
| c->on_error); |
| |
| /* See count_io_errors for why 88 */ |
| sysfs_print(io_error_halflife, c->error_decay * 88); |
| sysfs_print(io_error_limit, c->error_limit); |
| |
| 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(cutoff_writeback, bch_cutoff_writeback); |
| sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync); |
| |
| 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(expensive_debug_checks, |
| "%i", c->expensive_debug_checks); |
| 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); |
| sysfs_printf(idle_max_writeback_rate, "%i", |
| c->idle_max_writeback_rate_enabled); |
| sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback); |
| sysfs_printf(io_disable, "%i", |
| test_bit(CACHE_SET_IO_DISABLE, &c->flags)); |
| |
| if (attr == &sysfs_bset_tree_stats) |
| return bch_bset_print_stats(c, buf); |
| |
| if (attr == &sysfs_feature_compat) |
| return bch_print_cache_set_feature_compat(c, buf, PAGE_SIZE); |
| if (attr == &sysfs_feature_ro_compat) |
| return bch_print_cache_set_feature_ro_compat(c, buf, PAGE_SIZE); |
| if (attr == &sysfs_feature_incompat) |
| return bch_print_cache_set_feature_incompat(c, buf, PAGE_SIZE); |
| |
| return 0; |
| } |
| SHOW_LOCKED(bch_cache_set) |
| |
| STORE(__bch_cache_set) |
| { |
| struct cache_set *c = container_of(kobj, struct cache_set, kobj); |
| ssize_t v; |
| |
| /* no user space access if system is rebooting */ |
| if (bcache_is_reboot) |
| return -EBUSY; |
| |
| 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->cache->sb)) { |
| SET_CACHE_SYNC(&c->cache->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) |
| force_wake_up_gc(c); |
| |
| if (attr == &sysfs_prune_cache) { |
| struct shrink_control sc; |
| |
| sc.gfp_mask = GFP_KERNEL; |
| sc.nr_to_scan = strtoul_or_return(buf); |
| if (c->shrink) |
| c->shrink->scan_objects(c->shrink, &sc); |
| } |
| |
| sysfs_strtoul_clamp(congested_read_threshold_us, |
| c->congested_read_threshold_us, |
| 0, UINT_MAX); |
| sysfs_strtoul_clamp(congested_write_threshold_us, |
| c->congested_write_threshold_us, |
| 0, UINT_MAX); |
| |
| if (attr == &sysfs_errors) { |
| v = __sysfs_match_string(error_actions, -1, buf); |
| if (v < 0) |
| return v; |
| |
| c->on_error = v; |
| } |
| |
| sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX); |
| |
| /* See count_io_errors() for why 88 */ |
| if (attr == &sysfs_io_error_halflife) { |
| unsigned long v = 0; |
| ssize_t ret; |
| |
| ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX); |
| if (!ret) { |
| c->error_decay = v / 88; |
| return size; |
| } |
| return ret; |
| } |
| |
| if (attr == &sysfs_io_disable) { |
| v = strtoul_or_return(buf); |
| if (v) { |
| if (test_and_set_bit(CACHE_SET_IO_DISABLE, |
| &c->flags)) |
| pr_warn("CACHE_SET_IO_DISABLE already set\n"); |
| } else { |
| if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, |
| &c->flags)) |
| pr_warn("CACHE_SET_IO_DISABLE already cleared\n"); |
| } |
| } |
| |
| sysfs_strtoul_clamp(journal_delay_ms, |
| c->journal_delay_ms, |
| 0, USHRT_MAX); |
| sysfs_strtoul_bool(verify, c->verify); |
| sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled); |
| sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); |
| sysfs_strtoul_bool(gc_always_rewrite, c->gc_always_rewrite); |
| sysfs_strtoul_bool(btree_shrinker_disabled, c->shrinker_disabled); |
| sysfs_strtoul_bool(copy_gc_enabled, c->copy_gc_enabled); |
| sysfs_strtoul_bool(idle_max_writeback_rate, |
| c->idle_max_writeback_rate_enabled); |
| |
| /* |
| * write gc_after_writeback here may overwrite an already set |
| * BCH_DO_AUTO_GC, it doesn't matter because this flag will be |
| * set in next chance. |
| */ |
| sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1); |
| |
| 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); |
| |
| /* no user space access if system is rebooting */ |
| if (bcache_is_reboot) |
| return -EBUSY; |
| |
| 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_attrs[] = { |
| &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_errors, |
| &sysfs_io_error_limit, |
| &sysfs_io_error_halflife, |
| &sysfs_congested, |
| &sysfs_congested_read_threshold_us, |
| &sysfs_congested_write_threshold_us, |
| &sysfs_clear_stats, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(bch_cache_set); |
| KTYPE(bch_cache_set); |
| |
| static struct attribute *bch_cache_set_internal_attrs[] = { |
| &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_btree_nodes, |
| &sysfs_btree_used_percent, |
| &sysfs_btree_cache_max_chain, |
| |
| &sysfs_bset_tree_stats, |
| &sysfs_cache_read_races, |
| &sysfs_reclaim, |
| &sysfs_reclaimed_journal_buckets, |
| &sysfs_flush_write, |
| &sysfs_writeback_keys_done, |
| &sysfs_writeback_keys_failed, |
| |
| &sysfs_trigger_gc, |
| &sysfs_prune_cache, |
| #ifdef CONFIG_BCACHE_DEBUG |
| &sysfs_verify, |
| &sysfs_key_merging_disabled, |
| &sysfs_expensive_debug_checks, |
| #endif |
| &sysfs_gc_always_rewrite, |
| &sysfs_btree_shrinker_disabled, |
| &sysfs_copy_gc_enabled, |
| &sysfs_idle_max_writeback_rate, |
| &sysfs_gc_after_writeback, |
| &sysfs_io_disable, |
| &sysfs_cutoff_writeback, |
| &sysfs_cutoff_writeback_sync, |
| &sysfs_feature_compat, |
| &sysfs_feature_ro_compat, |
| &sysfs_feature_incompat, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(bch_cache_set_internal); |
| KTYPE(bch_cache_set_internal); |
| |
| static int __bch_cache_cmp(const void *l, const void *r) |
| { |
| cond_resched(); |
| return *((uint16_t *)r) - *((uint16_t *)l); |
| } |
| |
| 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); |
| |
| 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) { |
| struct bucket *b; |
| size_t n = ca->sb.nbuckets, i; |
| size_t unused = 0, available = 0, dirty = 0, meta = 0; |
| uint64_t sum = 0; |
| /* Compute 31 quantiles */ |
| uint16_t q[31], *p, *cached; |
| ssize_t ret; |
| |
| cached = p = vmalloc(array_size(sizeof(uint16_t), |
| ca->sb.nbuckets)); |
| if (!p) |
| return -ENOMEM; |
| |
| mutex_lock(&ca->set->bucket_lock); |
| for_each_bucket(b, ca) { |
| if (!GC_SECTORS_USED(b)) |
| unused++; |
| if (GC_MARK(b) == GC_MARK_RECLAIMABLE) |
| available++; |
| if (GC_MARK(b) == GC_MARK_DIRTY) |
| dirty++; |
| if (GC_MARK(b) == GC_MARK_METADATA) |
| meta++; |
| } |
| |
| 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), __bch_cache_cmp, NULL); |
| |
| while (n && |
| !cached[n - 1]) |
| --n; |
| |
| while (cached < p + n && |
| *cached == BTREE_PRIO) { |
| cached++; |
| n--; |
| } |
| |
| for (i = 0; i < n; i++) |
| sum += INITIAL_PRIO - cached[i]; |
| |
| if (n) |
| sum = div64_u64(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 = sysfs_emit(buf, |
| "Unused: %zu%%\n" |
| "Clean: %zu%%\n" |
| "Dirty: %zu%%\n" |
| "Metadata: %zu%%\n" |
| "Average: %llu\n" |
| "Sectors per Q: %zu\n" |
| "Quantiles: [", |
| unused * 100 / (size_t) ca->sb.nbuckets, |
| available * 100 / (size_t) ca->sb.nbuckets, |
| dirty * 100 / (size_t) ca->sb.nbuckets, |
| meta * 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 += sysfs_emit_at(buf, ret, "%u ", q[i]); |
| ret--; |
| |
| ret += sysfs_emit_at(buf, ret, "]\n"); |
| |
| return ret; |
| } |
| |
| return 0; |
| } |
| SHOW_LOCKED(bch_cache) |
| |
| STORE(__bch_cache) |
| { |
| struct cache *ca = container_of(kobj, struct cache, kobj); |
| ssize_t v; |
| |
| /* no user space access if system is rebooting */ |
| if (bcache_is_reboot) |
| return -EBUSY; |
| |
| if (attr == &sysfs_discard) { |
| bool v = strtoul_or_return(buf); |
| |
| if (bdev_max_discard_sectors(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) { |
| v = __sysfs_match_string(cache_replacement_policies, -1, buf); |
| if (v < 0) |
| return v; |
| |
| if ((unsigned int) 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_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_attrs[] = { |
| &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_cache_replacement_policy, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(bch_cache); |
| KTYPE(bch_cache); |