v4.19.13 snapshot.
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
new file mode 100644
index 0000000..26f035a
--- /dev/null
+++ b/drivers/md/bcache/sysfs.c
@@ -0,0 +1,1044 @@
+// 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 <linux/blkdev.h>
+#include <linux/sort.h>
+#include <linux/sched/clock.h>
+
+/* Default is -1; we skip past it for struct cached_dev's cache mode */
+static const char * const bch_cache_modes[] = {
+ "writethrough",
+ "writeback",
+ "writearound",
+ "none",
+ NULL
+};
+
+/* Default is -1; we skip past it for stop_when_cache_set_failed */
+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);
+
+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(state);
+read_attribute(cache_read_races);
+read_attribute(reclaim);
+read_attribute(flush_write);
+read_attribute(retry_flush_write);
+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(data_csum);
+rw_attribute(cache_mode);
+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_rate_update_seconds);
+rw_attribute(writeback_rate_i_term_inverse);
+rw_attribute(writeback_rate_p_term_inverse);
+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(readahead);
+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(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 += snprintf(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_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_print(writeback_delay);
+ var_print(writeback_percent);
+ sysfs_hprint(writeback_rate,
+ wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0);
+ sysfs_hprint(io_errors, 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_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);
+ 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);
+ ssize_t v;
+ struct cache_set *c;
+ struct kobj_uevent_env *env;
+
+#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);
+ d_strtoul(bypass_torture_test);
+ d_strtoul(writeback_metadata);
+ d_strtoul(writeback_running);
+ d_strtoul(writeback_delay);
+
+ sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40);
+
+ 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);
+ d_strtoul(writeback_rate_i_term_inverse);
+ d_strtoul_nonzero(writeback_rate_p_term_inverse);
+ d_strtoul_nonzero(writeback_rate_minimum);
+
+ 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;
+ }
+
+ 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) {
+ 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_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", 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);
+
+ 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)
+ if (!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_files[] = {
+ &sysfs_attach,
+ &sysfs_detach,
+ &sysfs_stop,
+#if 0
+ &sysfs_data_csum,
+#endif
+ &sysfs_cache_mode,
+ &sysfs_stop_when_cache_set_failed,
+ &sysfs_writeback_metadata,
+ &sysfs_writeback_running,
+ &sysfs_writeback_delay,
+ &sysfs_writeback_percent,
+ &sysfs_writeback_rate,
+ &sysfs_writeback_rate_update_seconds,
+ &sysfs_writeback_rate_i_term_inverse,
+ &sysfs_writeback_rate_p_term_inverse,
+ &sysfs_writeback_rate_minimum,
+ &sysfs_writeback_rate_debug,
+ &sysfs_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,
+ &sysfs_readahead,
+#ifdef CONFIG_BCACHE_DEBUG
+ &sysfs_verify,
+ &sysfs_bypass_torture_test,
+#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) {
+ set_bit(BCACHE_DEV_DETACHING, &d->flags);
+ 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);
+
+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 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++) {
+ unsigned int i = 0;
+ struct hlist_node *p;
+
+ hlist_for_each(p, h)
+ i++;
+
+ ret = max(ret, i);
+ }
+
+ 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->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, 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(flush_write,
+ atomic_long_read(&c->flush_write));
+
+ sysfs_print(retry_flush_write,
+ atomic_long_read(&c->retry_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(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(io_disable, "%i",
+ test_bit(CACHE_SET_IO_DISABLE, &c->flags));
+
+ 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);
+ ssize_t v;
+
+ 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) {
+ /*
+ * Garbage collection thread only works when sectors_to_gc < 0,
+ * when users write to sysfs entry trigger_gc, most of time
+ * they want to forcibly triger gargage collection. Here -1 is
+ * set to c->sectors_to_gc, to make gc_should_run() give a
+ * chance to permit gc thread to run. "give a chance" means
+ * before going into gc_should_run(), there is still chance
+ * that c->sectors_to_gc being set to other positive value. So
+ * writing sysfs entry trigger_gc won't always make sure gc
+ * thread takes effect.
+ */
+ atomic_set(&c->sectors_to_gc, -1);
+ 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);
+ c->shrink.scan_objects(&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_errors) {
+ v = __sysfs_match_string(error_actions, -1, buf);
+ if (v < 0)
+ return v;
+
+ c->on_error = v;
+ }
+
+ if (attr == &sysfs_io_error_limit)
+ c->error_limit = strtoul_or_return(buf);
+
+ /* See count_io_errors() for why 88 */
+ if (attr == &sysfs_io_error_halflife)
+ c->error_decay = strtoul_or_return(buf) / 88;
+
+ 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");
+ } else {
+ if (!test_and_clear_bit(CACHE_SET_IO_DISABLE,
+ &c->flags))
+ pr_warn("CACHE_SET_IO_DISABLE already cleared");
+ }
+ }
+
+ 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(expensive_debug_checks, c->expensive_debug_checks);
+ 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_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
+};
+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_btree_nodes,
+ &sysfs_btree_used_percent,
+ &sysfs_btree_cache_max_chain,
+
+ &sysfs_bset_tree_stats,
+ &sysfs_cache_read_races,
+ &sysfs_reclaim,
+ &sysfs_flush_write,
+ &sysfs_retry_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_io_disable,
+ NULL
+};
+KTYPE(bch_cache_set_internal);
+
+static int __bch_cache_cmp(const void *l, const void *r)
+{
+ 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;
+
+ unused = ca->sb.nbuckets - n;
+
+ while (cached < p + n &&
+ *cached == BTREE_PRIO)
+ cached++, n--;
+
+ 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"
+ "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 += 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);
+ ssize_t v;
+
+ 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) {
+ 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_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_cache_replacement_policy,
+ NULL
+};
+KTYPE(bch_cache);