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![Christoph Hellwig](/assets/img/avatar_default.png)
Just use a non-zero max_discard_sectors as an indicator for discard support, similar to what is done for write zeroes. The only places where needs special attention is the RAID5 driver, which must clear discard support for security reasons by default, even if the default stacking rules would allow for it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd] Acked-by: Jan Höppner <hoeppner@linux.ibm.com> [s390] Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: David Sterba <dsterba@suse.com> [btrfs] Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20220415045258.199825-25-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
1204 lines
30 KiB
C
1204 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bcache sysfs interfaces
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*
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* Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
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* Copyright 2012 Google, Inc.
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*/
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#include "bcache.h"
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#include "sysfs.h"
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#include "btree.h"
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#include "request.h"
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#include "writeback.h"
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#include "features.h"
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#include <linux/blkdev.h>
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#include <linux/sort.h>
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#include <linux/sched/clock.h>
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extern bool bcache_is_reboot;
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/* Default is 0 ("writethrough") */
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static const char * const bch_cache_modes[] = {
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"writethrough",
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"writeback",
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"writearound",
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"none",
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NULL
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};
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static const char * const bch_reada_cache_policies[] = {
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"all",
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"meta-only",
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NULL
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};
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/* Default is 0 ("auto") */
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static const char * const bch_stop_on_failure_modes[] = {
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"auto",
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"always",
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NULL
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};
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static const char * const cache_replacement_policies[] = {
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"lru",
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"fifo",
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"random",
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NULL
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};
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static const char * const error_actions[] = {
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"unregister",
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"panic",
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NULL
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};
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write_attribute(attach);
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write_attribute(detach);
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write_attribute(unregister);
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write_attribute(stop);
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write_attribute(clear_stats);
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write_attribute(trigger_gc);
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write_attribute(prune_cache);
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write_attribute(flash_vol_create);
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read_attribute(bucket_size);
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read_attribute(block_size);
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read_attribute(nbuckets);
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read_attribute(tree_depth);
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read_attribute(root_usage_percent);
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read_attribute(priority_stats);
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read_attribute(btree_cache_size);
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read_attribute(btree_cache_max_chain);
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read_attribute(cache_available_percent);
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read_attribute(written);
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read_attribute(btree_written);
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read_attribute(metadata_written);
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read_attribute(active_journal_entries);
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read_attribute(backing_dev_name);
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read_attribute(backing_dev_uuid);
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sysfs_time_stats_attribute(btree_gc, sec, ms);
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sysfs_time_stats_attribute(btree_split, sec, us);
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sysfs_time_stats_attribute(btree_sort, ms, us);
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sysfs_time_stats_attribute(btree_read, ms, us);
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read_attribute(btree_nodes);
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read_attribute(btree_used_percent);
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read_attribute(average_key_size);
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read_attribute(dirty_data);
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read_attribute(bset_tree_stats);
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read_attribute(feature_compat);
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read_attribute(feature_ro_compat);
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read_attribute(feature_incompat);
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read_attribute(state);
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read_attribute(cache_read_races);
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read_attribute(reclaim);
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read_attribute(reclaimed_journal_buckets);
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read_attribute(flush_write);
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read_attribute(writeback_keys_done);
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read_attribute(writeback_keys_failed);
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read_attribute(io_errors);
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read_attribute(congested);
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read_attribute(cutoff_writeback);
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read_attribute(cutoff_writeback_sync);
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rw_attribute(congested_read_threshold_us);
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rw_attribute(congested_write_threshold_us);
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rw_attribute(sequential_cutoff);
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rw_attribute(data_csum);
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rw_attribute(cache_mode);
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rw_attribute(readahead_cache_policy);
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rw_attribute(stop_when_cache_set_failed);
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rw_attribute(writeback_metadata);
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rw_attribute(writeback_running);
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rw_attribute(writeback_percent);
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rw_attribute(writeback_delay);
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rw_attribute(writeback_rate);
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rw_attribute(writeback_consider_fragment);
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rw_attribute(writeback_rate_update_seconds);
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rw_attribute(writeback_rate_i_term_inverse);
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rw_attribute(writeback_rate_p_term_inverse);
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rw_attribute(writeback_rate_fp_term_low);
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rw_attribute(writeback_rate_fp_term_mid);
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rw_attribute(writeback_rate_fp_term_high);
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rw_attribute(writeback_rate_minimum);
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read_attribute(writeback_rate_debug);
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read_attribute(stripe_size);
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read_attribute(partial_stripes_expensive);
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rw_attribute(synchronous);
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rw_attribute(journal_delay_ms);
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rw_attribute(io_disable);
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rw_attribute(discard);
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rw_attribute(running);
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rw_attribute(label);
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rw_attribute(errors);
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rw_attribute(io_error_limit);
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rw_attribute(io_error_halflife);
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rw_attribute(verify);
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rw_attribute(bypass_torture_test);
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rw_attribute(key_merging_disabled);
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rw_attribute(gc_always_rewrite);
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rw_attribute(expensive_debug_checks);
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rw_attribute(cache_replacement_policy);
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rw_attribute(btree_shrinker_disabled);
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rw_attribute(copy_gc_enabled);
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rw_attribute(idle_max_writeback_rate);
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rw_attribute(gc_after_writeback);
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rw_attribute(size);
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static ssize_t bch_snprint_string_list(char *buf,
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size_t size,
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const char * const list[],
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size_t selected)
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{
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char *out = buf;
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size_t i;
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for (i = 0; list[i]; i++)
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out += scnprintf(out, buf + size - out,
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i == selected ? "[%s] " : "%s ", list[i]);
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out[-1] = '\n';
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return out - buf;
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}
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SHOW(__bch_cached_dev)
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{
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struct cached_dev *dc = container_of(kobj, struct cached_dev,
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disk.kobj);
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char const *states[] = { "no cache", "clean", "dirty", "inconsistent" };
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int wb = dc->writeback_running;
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#define var(stat) (dc->stat)
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if (attr == &sysfs_cache_mode)
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return bch_snprint_string_list(buf, PAGE_SIZE,
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bch_cache_modes,
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BDEV_CACHE_MODE(&dc->sb));
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if (attr == &sysfs_readahead_cache_policy)
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return bch_snprint_string_list(buf, PAGE_SIZE,
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bch_reada_cache_policies,
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dc->cache_readahead_policy);
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if (attr == &sysfs_stop_when_cache_set_failed)
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return bch_snprint_string_list(buf, PAGE_SIZE,
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bch_stop_on_failure_modes,
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dc->stop_when_cache_set_failed);
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sysfs_printf(data_csum, "%i", dc->disk.data_csum);
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var_printf(verify, "%i");
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var_printf(bypass_torture_test, "%i");
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var_printf(writeback_metadata, "%i");
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var_printf(writeback_running, "%i");
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var_printf(writeback_consider_fragment, "%i");
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var_print(writeback_delay);
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var_print(writeback_percent);
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sysfs_hprint(writeback_rate,
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wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0);
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sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors));
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sysfs_printf(io_error_limit, "%i", dc->error_limit);
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sysfs_printf(io_disable, "%i", dc->io_disable);
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var_print(writeback_rate_update_seconds);
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var_print(writeback_rate_i_term_inverse);
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var_print(writeback_rate_p_term_inverse);
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var_print(writeback_rate_fp_term_low);
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var_print(writeback_rate_fp_term_mid);
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var_print(writeback_rate_fp_term_high);
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var_print(writeback_rate_minimum);
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if (attr == &sysfs_writeback_rate_debug) {
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char rate[20];
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char dirty[20];
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char target[20];
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char proportional[20];
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char integral[20];
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char change[20];
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s64 next_io;
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/*
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* Except for dirty and target, other values should
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* be 0 if writeback is not running.
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*/
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bch_hprint(rate,
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wb ? atomic_long_read(&dc->writeback_rate.rate) << 9
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: 0);
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bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
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bch_hprint(target, dc->writeback_rate_target << 9);
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bch_hprint(proportional,
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wb ? dc->writeback_rate_proportional << 9 : 0);
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bch_hprint(integral,
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wb ? dc->writeback_rate_integral_scaled << 9 : 0);
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bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0);
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next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(),
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NSEC_PER_MSEC) : 0;
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return sprintf(buf,
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"rate:\t\t%s/sec\n"
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"dirty:\t\t%s\n"
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"target:\t\t%s\n"
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"proportional:\t%s\n"
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"integral:\t%s\n"
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"change:\t\t%s/sec\n"
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"next io:\t%llims\n",
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rate, dirty, target, proportional,
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integral, change, next_io);
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}
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sysfs_hprint(dirty_data,
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bcache_dev_sectors_dirty(&dc->disk) << 9);
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sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9);
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var_printf(partial_stripes_expensive, "%u");
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var_hprint(sequential_cutoff);
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sysfs_print(running, atomic_read(&dc->running));
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sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
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if (attr == &sysfs_label) {
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memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
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buf[SB_LABEL_SIZE + 1] = '\0';
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strcat(buf, "\n");
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return strlen(buf);
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}
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if (attr == &sysfs_backing_dev_name) {
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snprintf(buf, BDEVNAME_SIZE + 1, "%pg", dc->bdev);
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strcat(buf, "\n");
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return strlen(buf);
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}
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if (attr == &sysfs_backing_dev_uuid) {
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/* convert binary uuid into 36-byte string plus '\0' */
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snprintf(buf, 36+1, "%pU", dc->sb.uuid);
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strcat(buf, "\n");
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return strlen(buf);
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}
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#undef var
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return 0;
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}
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SHOW_LOCKED(bch_cached_dev)
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STORE(__cached_dev)
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{
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struct cached_dev *dc = container_of(kobj, struct cached_dev,
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disk.kobj);
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ssize_t v;
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struct cache_set *c;
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struct kobj_uevent_env *env;
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/* no user space access if system is rebooting */
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if (bcache_is_reboot)
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return -EBUSY;
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#define d_strtoul(var) sysfs_strtoul(var, dc->var)
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#define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
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#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
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sysfs_strtoul(data_csum, dc->disk.data_csum);
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d_strtoul(verify);
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sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test);
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sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata);
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sysfs_strtoul_bool(writeback_running, dc->writeback_running);
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sysfs_strtoul_bool(writeback_consider_fragment, dc->writeback_consider_fragment);
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sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX);
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sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent,
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0, bch_cutoff_writeback);
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if (attr == &sysfs_writeback_rate) {
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ssize_t ret;
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long int v = atomic_long_read(&dc->writeback_rate.rate);
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ret = strtoul_safe_clamp(buf, v, 1, INT_MAX);
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if (!ret) {
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atomic_long_set(&dc->writeback_rate.rate, v);
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ret = size;
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}
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return ret;
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}
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sysfs_strtoul_clamp(writeback_rate_update_seconds,
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dc->writeback_rate_update_seconds,
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1, WRITEBACK_RATE_UPDATE_SECS_MAX);
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sysfs_strtoul_clamp(writeback_rate_i_term_inverse,
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dc->writeback_rate_i_term_inverse,
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1, UINT_MAX);
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sysfs_strtoul_clamp(writeback_rate_p_term_inverse,
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dc->writeback_rate_p_term_inverse,
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1, UINT_MAX);
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sysfs_strtoul_clamp(writeback_rate_fp_term_low,
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dc->writeback_rate_fp_term_low,
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1, dc->writeback_rate_fp_term_mid - 1);
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sysfs_strtoul_clamp(writeback_rate_fp_term_mid,
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dc->writeback_rate_fp_term_mid,
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dc->writeback_rate_fp_term_low + 1,
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dc->writeback_rate_fp_term_high - 1);
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sysfs_strtoul_clamp(writeback_rate_fp_term_high,
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dc->writeback_rate_fp_term_high,
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dc->writeback_rate_fp_term_mid + 1, UINT_MAX);
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sysfs_strtoul_clamp(writeback_rate_minimum,
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dc->writeback_rate_minimum,
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1, UINT_MAX);
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sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);
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if (attr == &sysfs_io_disable) {
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int v = strtoul_or_return(buf);
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dc->io_disable = v ? 1 : 0;
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}
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sysfs_strtoul_clamp(sequential_cutoff,
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dc->sequential_cutoff,
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0, UINT_MAX);
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if (attr == &sysfs_clear_stats)
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bch_cache_accounting_clear(&dc->accounting);
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if (attr == &sysfs_running &&
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strtoul_or_return(buf)) {
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v = bch_cached_dev_run(dc);
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if (v)
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return v;
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}
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if (attr == &sysfs_cache_mode) {
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v = __sysfs_match_string(bch_cache_modes, -1, buf);
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if (v < 0)
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return v;
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if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
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SET_BDEV_CACHE_MODE(&dc->sb, v);
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bch_write_bdev_super(dc, NULL);
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}
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}
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if (attr == &sysfs_readahead_cache_policy) {
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v = __sysfs_match_string(bch_reada_cache_policies, -1, buf);
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if (v < 0)
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return v;
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if ((unsigned int) v != dc->cache_readahead_policy)
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dc->cache_readahead_policy = v;
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}
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if (attr == &sysfs_stop_when_cache_set_failed) {
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v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
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if (v < 0)
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return v;
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dc->stop_when_cache_set_failed = v;
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}
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if (attr == &sysfs_label) {
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if (size > SB_LABEL_SIZE)
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return -EINVAL;
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memcpy(dc->sb.label, buf, size);
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if (size < SB_LABEL_SIZE)
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dc->sb.label[size] = '\0';
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if (size && dc->sb.label[size - 1] == '\n')
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dc->sb.label[size - 1] = '\0';
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bch_write_bdev_super(dc, NULL);
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if (dc->disk.c) {
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memcpy(dc->disk.c->uuids[dc->disk.id].label,
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buf, SB_LABEL_SIZE);
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bch_uuid_write(dc->disk.c);
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}
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env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
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if (!env)
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return -ENOMEM;
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add_uevent_var(env, "DRIVER=bcache");
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add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid);
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add_uevent_var(env, "CACHED_LABEL=%s", buf);
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kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj,
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KOBJ_CHANGE,
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env->envp);
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kfree(env);
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}
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if (attr == &sysfs_attach) {
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uint8_t set_uuid[16];
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if (bch_parse_uuid(buf, set_uuid) < 16)
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return -EINVAL;
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v = -ENOENT;
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list_for_each_entry(c, &bch_cache_sets, list) {
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v = bch_cached_dev_attach(dc, c, set_uuid);
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if (!v)
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return size;
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}
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if (v == -ENOENT)
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pr_err("Can't attach %s: cache set not found\n", buf);
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return v;
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}
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if (attr == &sysfs_detach && dc->disk.c)
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bch_cached_dev_detach(dc);
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if (attr == &sysfs_stop)
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bcache_device_stop(&dc->disk);
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return size;
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}
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STORE(bch_cached_dev)
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{
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struct cached_dev *dc = container_of(kobj, struct cached_dev,
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disk.kobj);
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/* no user space access if system is rebooting */
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if (bcache_is_reboot)
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return -EBUSY;
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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 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->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);
|
|
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)
|
|
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;
|
|
|
|
/* 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);
|