![John Sheu](/assets/img/avatar_default.png)
Uninlined nested functions can cause crashes when using ftrace, as they don't follow the normal calling convention and confuse the ftrace function graph tracer as it examines the stack. Also, nested functions are supported as a gcc extension, but may fail on other compilers (e.g. llvm). Signed-off-by: John Sheu <john.sheu@gmail.com>
899 lines
22 KiB
C
899 lines
22 KiB
C
/*
|
|
* 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
|
|
};
|
|
|
|
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(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(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);
|
|
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(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);
|
|
|
|
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(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, dc->writeback_rate.rate << 9);
|
|
|
|
var_print(writeback_rate_update_seconds);
|
|
var_print(writeback_rate_d_term);
|
|
var_print(writeback_rate_p_term_inverse);
|
|
|
|
if (attr == &sysfs_writeback_rate_debug) {
|
|
char rate[20];
|
|
char dirty[20];
|
|
char target[20];
|
|
char proportional[20];
|
|
char derivative[20];
|
|
char change[20];
|
|
s64 next_io;
|
|
|
|
bch_hprint(rate, dc->writeback_rate.rate << 9);
|
|
bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
|
|
bch_hprint(target, dc->writeback_rate_target << 9);
|
|
bch_hprint(proportional,dc->writeback_rate_proportional << 9);
|
|
bch_hprint(derivative, dc->writeback_rate_derivative << 9);
|
|
bch_hprint(change, dc->writeback_rate_change << 9);
|
|
|
|
next_io = div64_s64(dc->writeback_rate.next - local_clock(),
|
|
NSEC_PER_MSEC);
|
|
|
|
return sprintf(buf,
|
|
"rate:\t\t%s/sec\n"
|
|
"dirty:\t\t%s\n"
|
|
"target:\t\t%s\n"
|
|
"proportional:\t%s\n"
|
|
"derivative:\t%s\n"
|
|
"change:\t\t%s/sec\n"
|
|
"next io:\t%llims\n",
|
|
rate, dirty, target, proportional,
|
|
derivative, change, next_io);
|
|
}
|
|
|
|
sysfs_hprint(dirty_data,
|
|
bcache_dev_sectors_dirty(&dc->disk) << 9);
|
|
|
|
sysfs_hprint(stripe_size, 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);
|
|
unsigned v = size;
|
|
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);
|
|
|
|
sysfs_strtoul_clamp(writeback_rate,
|
|
dc->writeback_rate.rate, 1, INT_MAX);
|
|
|
|
d_strtoul_nonzero(writeback_rate_update_seconds);
|
|
d_strtoul(writeback_rate_d_term);
|
|
d_strtoul_nonzero(writeback_rate_p_term_inverse);
|
|
|
|
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) {
|
|
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) {
|
|
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_debug,
|
|
&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 bch_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->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 bch_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;
|
|
}
|
|
|
|
static unsigned 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 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(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 >> 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(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);
|
|
|
|
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)
|
|
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) {
|
|
ssize_t v = bch_read_string_list(buf, error_actions);
|
|
|
|
if (v < 0)
|
|
return v;
|
|
|
|
c->on_error = v;
|
|
}
|
|
|
|
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(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_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,
|
|
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);
|
|
|
|
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); }
|
|
|
|
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(ca->sb.nbuckets * sizeof(uint16_t));
|
|
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), 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);
|
|
|
|
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_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);
|