diff options
Diffstat (limited to 'libbcache/super.c')
| -rw-r--r-- | libbcache/super.c | 2047 |
1 files changed, 0 insertions, 2047 deletions
diff --git a/libbcache/super.c b/libbcache/super.c deleted file mode 100644 index f5f74936..00000000 --- a/libbcache/super.c +++ /dev/null @@ -1,2047 +0,0 @@ -/* - * bcache setup/teardown code, and some metadata io - read a superblock and - * figure out what to do with it. - * - * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> - * Copyright 2012 Google, Inc. - */ - -#include "bcache.h" -#include "blockdev.h" -#include "alloc.h" -#include "btree_cache.h" -#include "btree_gc.h" -#include "btree_update.h" -#include "btree_io.h" -#include "chardev.h" -#include "checksum.h" -#include "clock.h" -#include "compress.h" -#include "debug.h" -#include "error.h" -#include "fs.h" -#include "fs-gc.h" -#include "inode.h" -#include "io.h" -#include "journal.h" -#include "keylist.h" -#include "move.h" -#include "migrate.h" -#include "movinggc.h" -#include "notify.h" -#include "stats.h" -#include "super.h" -#include "super-io.h" -#include "tier.h" -#include "writeback.h" - -#include <linux/backing-dev.h> -#include <linux/blkdev.h> -#include <linux/debugfs.h> -#include <linux/device.h> -#include <linux/genhd.h> -#include <linux/idr.h> -#include <linux/kthread.h> -#include <linux/module.h> -#include <linux/percpu.h> -#include <linux/random.h> -#include <linux/reboot.h> -#include <linux/sysfs.h> -#include <crypto/hash.h> - -#include <trace/events/bcache.h> - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); - -static const uuid_le invalid_uuid = { - .b = { - 0xa0, 0x3e, 0xf8, 0xed, 0x3e, 0xe1, 0xb8, 0x78, - 0xc8, 0x50, 0xfc, 0x5e, 0xcb, 0x16, 0xcd, 0x99 - } -}; - -static struct kset *bcache_kset; -static LIST_HEAD(bch_fs_list); -static DEFINE_MUTEX(bch_fs_list_lock); - -static DECLARE_WAIT_QUEUE_HEAD(bch_read_only_wait); -struct workqueue_struct *bcache_io_wq; -struct crypto_shash *bch_sha256; - -static void bch_dev_free(struct bch_dev *); -static int bch_dev_alloc(struct bch_fs *, unsigned); -static int bch_dev_sysfs_online(struct bch_dev *); -static void __bch_dev_read_only(struct bch_fs *, struct bch_dev *); - -struct bch_fs *bch_bdev_to_fs(struct block_device *bdev) -{ - struct bch_fs *c; - struct bch_dev *ca; - unsigned i; - - mutex_lock(&bch_fs_list_lock); - rcu_read_lock(); - - list_for_each_entry(c, &bch_fs_list, list) - for_each_member_device_rcu(ca, c, i) - if (ca->disk_sb.bdev == bdev) { - closure_get(&c->cl); - goto found; - } - c = NULL; -found: - rcu_read_unlock(); - mutex_unlock(&bch_fs_list_lock); - - return c; -} - -static struct bch_fs *__bch_uuid_to_fs(uuid_le uuid) -{ - struct bch_fs *c; - - lockdep_assert_held(&bch_fs_list_lock); - - list_for_each_entry(c, &bch_fs_list, list) - if (!memcmp(&c->disk_sb->uuid, &uuid, sizeof(uuid_le))) - return c; - - return NULL; -} - -struct bch_fs *bch_uuid_to_fs(uuid_le uuid) -{ - struct bch_fs *c; - - mutex_lock(&bch_fs_list_lock); - c = __bch_uuid_to_fs(uuid); - if (c) - closure_get(&c->cl); - mutex_unlock(&bch_fs_list_lock); - - return c; -} - -int bch_congested(struct bch_fs *c, int bdi_bits) -{ - struct backing_dev_info *bdi; - struct bch_dev *ca; - unsigned i; - int ret = 0; - - if (bdi_bits & (1 << WB_sync_congested)) { - /* Reads - check all devices: */ - for_each_readable_member(ca, c, i) { - bdi = blk_get_backing_dev_info(ca->disk_sb.bdev); - - if (bdi_congested(bdi, bdi_bits)) { - ret = 1; - break; - } - } - } else { - /* Writes prefer fastest tier: */ - struct bch_tier *tier = READ_ONCE(c->fastest_tier); - struct dev_group *grp = tier ? &tier->devs : &c->all_devs; - - rcu_read_lock(); - group_for_each_dev(ca, grp, i) { - bdi = blk_get_backing_dev_info(ca->disk_sb.bdev); - - if (bdi_congested(bdi, bdi_bits)) { - ret = 1; - break; - } - } - rcu_read_unlock(); - } - - return ret; -} - -static int bch_congested_fn(void *data, int bdi_bits) -{ - struct bch_fs *c = data; - - return bch_congested(c, bdi_bits); -} - -/* Filesystem RO/RW: */ - -/* - * For startup/shutdown of RW stuff, the dependencies are: - * - * - foreground writes depend on copygc and tiering (to free up space) - * - * - copygc and tiering depend on mark and sweep gc (they actually probably - * don't because they either reserve ahead of time or don't block if - * allocations fail, but allocations can require mark and sweep gc to run - * because of generation number wraparound) - * - * - all of the above depends on the allocator threads - * - * - allocator depends on the journal (when it rewrites prios and gens) - */ - -static void __bch_fs_read_only(struct bch_fs *c) -{ - struct bch_dev *ca; - unsigned i; - - bch_tiering_stop(c); - - for_each_member_device(ca, c, i) - bch_moving_gc_stop(ca); - - bch_gc_thread_stop(c); - - bch_btree_flush(c); - - for_each_member_device(ca, c, i) - bch_dev_allocator_stop(ca); - - bch_fs_journal_stop(&c->journal); -} - -static void bch_writes_disabled(struct percpu_ref *writes) -{ - struct bch_fs *c = container_of(writes, struct bch_fs, writes); - - set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags); - wake_up(&bch_read_only_wait); -} - -void bch_fs_read_only(struct bch_fs *c) -{ - mutex_lock(&c->state_lock); - if (c->state != BCH_FS_STARTING && - c->state != BCH_FS_RW) - goto out; - - if (test_bit(BCH_FS_ERROR, &c->flags)) - goto out; - - trace_fs_read_only(c); - - /* - * Block new foreground-end write operations from starting - any new - * writes will return -EROFS: - * - * (This is really blocking new _allocations_, writes to previously - * allocated space can still happen until stopping the allocator in - * bch_dev_allocator_stop()). - */ - percpu_ref_kill(&c->writes); - - del_timer(&c->foreground_write_wakeup); - cancel_delayed_work(&c->pd_controllers_update); - - c->foreground_write_pd.rate.rate = UINT_MAX; - bch_wake_delayed_writes((unsigned long) c); - - /* - * If we're not doing an emergency shutdown, we want to wait on - * outstanding writes to complete so they don't see spurious errors due - * to shutting down the allocator: - * - * If we are doing an emergency shutdown outstanding writes may - * hang until we shutdown the allocator so we don't want to wait - * on outstanding writes before shutting everything down - but - * we do need to wait on them before returning and signalling - * that going RO is complete: - */ - wait_event(bch_read_only_wait, - test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) || - test_bit(BCH_FS_EMERGENCY_RO, &c->flags)); - - __bch_fs_read_only(c); - - wait_event(bch_read_only_wait, - test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags)); - - clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags); - - if (!bch_journal_error(&c->journal) && - !test_bit(BCH_FS_ERROR, &c->flags)) { - mutex_lock(&c->sb_lock); - SET_BCH_SB_CLEAN(c->disk_sb, true); - bch_write_super(c); - mutex_unlock(&c->sb_lock); - } - - c->state = BCH_FS_RO; - bch_notify_fs_read_only(c); - trace_fs_read_only_done(c); -out: - mutex_unlock(&c->state_lock); -} - -static void bch_fs_read_only_work(struct work_struct *work) -{ - struct bch_fs *c = - container_of(work, struct bch_fs, read_only_work); - - bch_fs_read_only(c); -} - -static void bch_fs_read_only_async(struct bch_fs *c) -{ - queue_work(system_long_wq, &c->read_only_work); -} - -bool bch_fs_emergency_read_only(struct bch_fs *c) -{ - bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags); - - bch_fs_read_only_async(c); - bch_journal_halt(&c->journal); - - wake_up(&bch_read_only_wait); - return ret; -} - -const char *bch_fs_read_write(struct bch_fs *c) -{ - struct bch_dev *ca; - const char *err = NULL; - unsigned i; - - mutex_lock(&c->state_lock); - if (c->state != BCH_FS_STARTING && - c->state != BCH_FS_RO) - goto out; - - err = "error starting allocator thread"; - for_each_rw_member(ca, c, i) - if (bch_dev_allocator_start(ca)) { - percpu_ref_put(&ca->io_ref); - goto err; - } - - err = "error starting btree GC thread"; - if (bch_gc_thread_start(c)) - goto err; - - err = "error starting moving GC thread"; - for_each_rw_member(ca, c, i) - if (bch_moving_gc_start(ca)) { - percpu_ref_put(&ca->io_ref); - goto err; - } - - err = "error starting tiering thread"; - if (bch_tiering_start(c)) - goto err; - - schedule_delayed_work(&c->pd_controllers_update, 5 * HZ); - - if (c->state != BCH_FS_STARTING) - percpu_ref_reinit(&c->writes); - - c->state = BCH_FS_RW; - err = NULL; -out: - mutex_unlock(&c->state_lock); - return err; -err: - __bch_fs_read_only(c); - goto out; -} - -/* Filesystem startup/shutdown: */ - -static void bch_fs_free(struct bch_fs *c) -{ - bch_fs_encryption_exit(c); - bch_fs_btree_exit(c); - bch_fs_journal_exit(&c->journal); - bch_io_clock_exit(&c->io_clock[WRITE]); - bch_io_clock_exit(&c->io_clock[READ]); - bch_fs_compress_exit(c); - bch_fs_blockdev_exit(c); - bdi_destroy(&c->bdi); - lg_lock_free(&c->usage_lock); - free_percpu(c->usage_percpu); - mempool_exit(&c->btree_bounce_pool); - mempool_exit(&c->bio_bounce_pages); - bioset_exit(&c->bio_write); - bioset_exit(&c->bio_read_split); - bioset_exit(&c->bio_read); - bioset_exit(&c->btree_read_bio); - mempool_exit(&c->btree_interior_update_pool); - mempool_exit(&c->btree_reserve_pool); - mempool_exit(&c->fill_iter); - percpu_ref_exit(&c->writes); - - if (c->copygc_wq) - destroy_workqueue(c->copygc_wq); - if (c->wq) - destroy_workqueue(c->wq); - - free_pages((unsigned long) c->disk_sb, c->disk_sb_order); - kfree(c); - module_put(THIS_MODULE); -} - -static void bch_fs_exit(struct bch_fs *c) -{ - unsigned i; - - del_timer_sync(&c->foreground_write_wakeup); - cancel_delayed_work_sync(&c->pd_controllers_update); - cancel_work_sync(&c->read_only_work); - cancel_work_sync(&c->bio_submit_work); - cancel_work_sync(&c->read_retry_work); - - for (i = 0; i < c->sb.nr_devices; i++) - if (c->devs[i]) - bch_dev_free(c->devs[i]); - - closure_debug_destroy(&c->cl); - kobject_put(&c->kobj); -} - -static void bch_fs_offline(struct bch_fs *c) -{ - struct bch_dev *ca; - unsigned i; - - mutex_lock(&bch_fs_list_lock); - list_del(&c->list); - mutex_unlock(&bch_fs_list_lock); - - for_each_member_device(ca, c, i) - if (ca->kobj.state_in_sysfs && - ca->disk_sb.bdev) - sysfs_remove_link(&part_to_dev(ca->disk_sb.bdev->bd_part)->kobj, - "bcache"); - - if (c->kobj.state_in_sysfs) - kobject_del(&c->kobj); - - bch_fs_debug_exit(c); - bch_fs_chardev_exit(c); - - bch_cache_accounting_destroy(&c->accounting); - - kobject_put(&c->time_stats); - kobject_put(&c->opts_dir); - kobject_put(&c->internal); - - __bch_fs_read_only(c); -} - -/* - * should be __bch_fs_stop4 - block devices are closed, now we can finally - * free it - */ -void bch_fs_release(struct kobject *kobj) -{ - struct bch_fs *c = container_of(kobj, struct bch_fs, kobj); - - bch_notify_fs_stopped(c); - bch_fs_free(c); -} - -/* - * All activity on the filesystem should have stopped now - close devices: - */ -static void __bch_fs_stop3(struct closure *cl) -{ - struct bch_fs *c = container_of(cl, struct bch_fs, cl); - - bch_fs_exit(c); -} - -/* - * Openers (i.e. block devices) should have exited, shutdown all userspace - * interfaces and wait for &c->cl to hit 0 - */ -static void __bch_fs_stop2(struct closure *cl) -{ - struct bch_fs *c = container_of(cl, struct bch_fs, caching); - - bch_fs_offline(c); - - closure_return(cl); -} - -/* - * First phase of the shutdown process that's kicked off by bch_fs_stop_async(); - * we haven't waited for anything to stop yet, we're just punting to process - * context to shut down block devices: - */ -static void __bch_fs_stop1(struct closure *cl) -{ - struct bch_fs *c = container_of(cl, struct bch_fs, caching); - - bch_blockdevs_stop(c); - - continue_at(cl, __bch_fs_stop2, system_wq); -} - -void bch_fs_stop_async(struct bch_fs *c) -{ - mutex_lock(&c->state_lock); - if (c->state != BCH_FS_STOPPING) { - c->state = BCH_FS_STOPPING; - closure_queue(&c->caching); - } - mutex_unlock(&c->state_lock); -} - -void bch_fs_stop(struct bch_fs *c) -{ - mutex_lock(&c->state_lock); - BUG_ON(c->state == BCH_FS_STOPPING); - c->state = BCH_FS_STOPPING; - mutex_unlock(&c->state_lock); - - bch_blockdevs_stop(c); - - closure_sync(&c->caching); - closure_debug_destroy(&c->caching); - - bch_fs_offline(c); - - closure_put(&c->cl); - closure_sync(&c->cl); - - bch_fs_exit(c); -} - -/* Stop, detaching from backing devices: */ -void bch_fs_detach(struct bch_fs *c) -{ - if (!test_and_set_bit(BCH_FS_DETACHING, &c->flags)) - bch_fs_stop_async(c); -} - -#define alloc_bucket_pages(gfp, ca) \ - ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(ca)))) - -static struct bch_fs *bch_fs_alloc(struct bch_sb *sb, struct bch_opts opts) -{ - struct bch_sb_field_members *mi; - struct bch_fs *c; - unsigned i, iter_size, journal_entry_bytes; - - c = kzalloc(sizeof(struct bch_fs), GFP_KERNEL); - if (!c) - return NULL; - - __module_get(THIS_MODULE); - - c->minor = -1; - - mutex_init(&c->state_lock); - mutex_init(&c->sb_lock); - INIT_RADIX_TREE(&c->devices, GFP_KERNEL); - mutex_init(&c->btree_cache_lock); - mutex_init(&c->bucket_lock); - mutex_init(&c->btree_root_lock); - INIT_WORK(&c->read_only_work, bch_fs_read_only_work); - - init_rwsem(&c->gc_lock); - -#define BCH_TIME_STAT(name, frequency_units, duration_units) \ - spin_lock_init(&c->name##_time.lock); - BCH_TIME_STATS() -#undef BCH_TIME_STAT - - bch_fs_allocator_init(c); - bch_fs_tiering_init(c); - - INIT_LIST_HEAD(&c->list); - INIT_LIST_HEAD(&c->cached_devs); - INIT_LIST_HEAD(&c->btree_cache); - INIT_LIST_HEAD(&c->btree_cache_freeable); - INIT_LIST_HEAD(&c->btree_cache_freed); - - INIT_LIST_HEAD(&c->btree_interior_update_list); - mutex_init(&c->btree_reserve_cache_lock); - mutex_init(&c->btree_interior_update_lock); - - mutex_init(&c->bio_bounce_pages_lock); - INIT_WORK(&c->bio_submit_work, bch_bio_submit_work); - spin_lock_init(&c->bio_submit_lock); - bio_list_init(&c->read_retry_list); - spin_lock_init(&c->read_retry_lock); - INIT_WORK(&c->read_retry_work, bch_read_retry_work); - mutex_init(&c->zlib_workspace_lock); - - seqcount_init(&c->gc_pos_lock); - - c->prio_clock[READ].hand = 1; - c->prio_clock[READ].min_prio = 0; - c->prio_clock[WRITE].hand = 1; - c->prio_clock[WRITE].min_prio = 0; - - c->congested_read_threshold_us = 2000; - c->congested_write_threshold_us = 20000; - c->error_limit = 16 << IO_ERROR_SHIFT; - init_waitqueue_head(&c->writeback_wait); - - c->writeback_pages_max = (256 << 10) / PAGE_SIZE; - - c->copy_gc_enabled = 1; - c->tiering_enabled = 1; - c->tiering_percent = 10; - - c->foreground_target_percent = 20; - - c->journal.write_time = &c->journal_write_time; - c->journal.delay_time = &c->journal_delay_time; - c->journal.blocked_time = &c->journal_blocked_time; - c->journal.flush_seq_time = &c->journal_flush_seq_time; - - mutex_init(&c->uevent_lock); - - mutex_lock(&c->sb_lock); - - if (bch_sb_to_fs(c, sb)) { - mutex_unlock(&c->sb_lock); - goto err; - } - - mutex_unlock(&c->sb_lock); - - scnprintf(c->name, sizeof(c->name), "%pU", &c->sb.user_uuid); - - bch_opts_apply(&c->opts, bch_sb_opts(sb)); - bch_opts_apply(&c->opts, opts); - - c->opts.nochanges |= c->opts.noreplay; - c->opts.read_only |= c->opts.nochanges; - - c->block_bits = ilog2(c->sb.block_size); - - if (bch_fs_init_fault("fs_alloc")) - goto err; - - iter_size = (btree_blocks(c) + 1) * 2 * - sizeof(struct btree_node_iter_set); - - journal_entry_bytes = 512U << BCH_SB_JOURNAL_ENTRY_SIZE(sb); - - if (!(c->wq = alloc_workqueue("bcache", - WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) || - !(c->copygc_wq = alloc_workqueue("bcache_copygc", - WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) || - percpu_ref_init(&c->writes, bch_writes_disabled, 0, GFP_KERNEL) || - mempool_init_kmalloc_pool(&c->btree_reserve_pool, 1, - sizeof(struct btree_reserve)) || - mempool_init_kmalloc_pool(&c->btree_interior_update_pool, 1, - sizeof(struct btree_interior_update)) || - mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) || - bioset_init(&c->btree_read_bio, 1, 0) || - bioset_init(&c->bio_read, 1, offsetof(struct bch_read_bio, bio)) || - bioset_init(&c->bio_read_split, 1, offsetof(struct bch_read_bio, bio)) || - bioset_init(&c->bio_write, 1, offsetof(struct bch_write_bio, bio)) || - mempool_init_page_pool(&c->bio_bounce_pages, - max_t(unsigned, - c->sb.btree_node_size, - BCH_ENCODED_EXTENT_MAX) / - PAGE_SECTORS, 0) || - !(c->usage_percpu = alloc_percpu(struct bch_fs_usage)) || - lg_lock_init(&c->usage_lock) || - mempool_init_page_pool(&c->btree_bounce_pool, 1, - ilog2(btree_pages(c))) || - bdi_setup_and_register(&c->bdi, "bcache") || - bch_fs_blockdev_init(c) || - bch_io_clock_init(&c->io_clock[READ]) || - bch_io_clock_init(&c->io_clock[WRITE]) || - bch_fs_journal_init(&c->journal, journal_entry_bytes) || - bch_fs_btree_init(c) || - bch_fs_encryption_init(c) || - bch_fs_compress_init(c) || - bch_check_set_has_compressed_data(c, c->opts.compression)) - goto err; - - c->bdi.ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE; - c->bdi.congested_fn = bch_congested_fn; - c->bdi.congested_data = c; - - mi = bch_sb_get_members(c->disk_sb); - for (i = 0; i < c->sb.nr_devices; i++) - if (!bch_is_zero(mi->members[i].uuid.b, sizeof(uuid_le)) && - bch_dev_alloc(c, i)) - goto err; - - /* - * Now that all allocations have succeeded, init various refcounty - * things that let us shutdown: - */ - closure_init(&c->cl, NULL); - - c->kobj.kset = bcache_kset; - kobject_init(&c->kobj, &bch_fs_ktype); - kobject_init(&c->internal, &bch_fs_internal_ktype); - kobject_init(&c->opts_dir, &bch_fs_opts_dir_ktype); - kobject_init(&c->time_stats, &bch_fs_time_stats_ktype); - - bch_cache_accounting_init(&c->accounting, &c->cl); - - closure_init(&c->caching, &c->cl); - set_closure_fn(&c->caching, __bch_fs_stop1, system_wq); - - closure_get(&c->cl); - continue_at_noreturn(&c->cl, __bch_fs_stop3, system_wq); - return c; -err: - bch_fs_free(c); - return NULL; -} - -static const char *__bch_fs_online(struct bch_fs *c) -{ - struct bch_dev *ca; - const char *err = NULL; - unsigned i; - int ret; - - lockdep_assert_held(&bch_fs_list_lock); - - if (!list_empty(&c->list)) - return NULL; - - if (__bch_uuid_to_fs(c->sb.uuid)) - return "filesystem UUID already open"; - - ret = bch_fs_chardev_init(c); - if (ret) - return "error creating character device"; - - bch_fs_debug_init(c); - - if (kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) || - kobject_add(&c->internal, &c->kobj, "internal") || - kobject_add(&c->opts_dir, &c->kobj, "options") || - kobject_add(&c->time_stats, &c->kobj, "time_stats") || - bch_cache_accounting_add_kobjs(&c->accounting, &c->kobj)) - return "error creating sysfs objects"; - - mutex_lock(&c->state_lock); - - err = "error creating sysfs objects"; - __for_each_member_device(ca, c, i) - if (bch_dev_sysfs_online(ca)) - goto err; - - err = "can't bring up blockdev volumes"; - if (bch_blockdev_volumes_start(c)) - goto err; - - bch_attach_backing_devs(c); - - list_add(&c->list, &bch_fs_list); - err = NULL; -err: - mutex_unlock(&c->state_lock); - return err; -} - -static const char *bch_fs_online(struct bch_fs *c) -{ - const char *err; - - mutex_lock(&bch_fs_list_lock); - err = __bch_fs_online(c); - mutex_unlock(&bch_fs_list_lock); - - return err; -} - -static const char *__bch_fs_start(struct bch_fs *c) -{ - const char *err = "cannot allocate memory"; - struct bch_sb_field_members *mi; - struct bch_dev *ca; - unsigned i, id; - time64_t now; - LIST_HEAD(journal); - struct jset *j; - int ret = -EINVAL; - - BUG_ON(c->state != BCH_FS_STARTING); - - mutex_lock(&c->sb_lock); - for_each_online_member(ca, c, i) - bch_sb_from_fs(c, ca); - mutex_unlock(&c->sb_lock); - - if (BCH_SB_INITIALIZED(c->disk_sb)) { - ret = bch_journal_read(c, &journal); - if (ret) - goto err; - - j = &list_entry(journal.prev, struct journal_replay, list)->j; - - c->prio_clock[READ].hand = le16_to_cpu(j->read_clock); - c->prio_clock[WRITE].hand = le16_to_cpu(j->write_clock); - - err = "error reading priorities"; - for_each_readable_member(ca, c, i) { - ret = bch_prio_read(ca); - if (ret) { - percpu_ref_put(&ca->io_ref); - goto err; - } - } - - for (id = 0; id < BTREE_ID_NR; id++) { - unsigned level; - struct bkey_i *k; - - err = "bad btree root"; - k = bch_journal_find_btree_root(c, j, id, &level); - if (!k && id == BTREE_ID_EXTENTS) - goto err; - if (!k) { - pr_debug("missing btree root: %d", id); - continue; - } - - err = "error reading btree root"; - if (bch_btree_root_read(c, id, k, level)) - goto err; - } - - bch_verbose(c, "starting mark and sweep:"); - - err = "error in recovery"; - if (bch_initial_gc(c, &journal)) - goto err; - - if (c->opts.noreplay) - goto recovery_done; - - bch_verbose(c, "mark and sweep done"); - - /* - * bch_journal_start() can't happen sooner, or btree_gc_finish() - * will give spurious errors about oldest_gen > bucket_gen - - * this is a hack but oh well. - */ - bch_journal_start(c); - - err = "error starting allocator thread"; - for_each_rw_member(ca, c, i) - if (bch_dev_allocator_start(ca)) { - percpu_ref_put(&ca->io_ref); - goto err; - } - - bch_verbose(c, "starting journal replay:"); - - err = "journal replay failed"; - ret = bch_journal_replay(c, &journal); - if (ret) - goto err; - - bch_verbose(c, "journal replay done"); - - if (c->opts.norecovery) - goto recovery_done; - - bch_verbose(c, "starting fsck:"); - err = "error in fsck"; - ret = bch_fsck(c, !c->opts.nofsck); - if (ret) - goto err; - - bch_verbose(c, "fsck done"); - } else { - struct bch_inode_unpacked inode; - struct bkey_inode_buf packed_inode; - struct closure cl; - - closure_init_stack(&cl); - - bch_notice(c, "initializing new filesystem"); - - bch_initial_gc(c, NULL); - - err = "unable to allocate journal buckets"; - for_each_rw_member(ca, c, i) - if (bch_dev_journal_alloc(ca)) { - percpu_ref_put(&ca->io_ref); - goto err; - } - - /* - * journal_res_get() will crash if called before this has - * set up the journal.pin FIFO and journal.cur pointer: - */ - bch_journal_start(c); - bch_journal_set_replay_done(&c->journal); - - err = "error starting allocator thread"; - for_each_rw_member(ca, c, i) - if (bch_dev_allocator_start(ca)) { - percpu_ref_put(&ca->io_ref); - goto err; - } - - err = "cannot allocate new btree root"; - for (id = 0; id < BTREE_ID_NR; id++) - if (bch_btree_root_alloc(c, id, &cl)) { - closure_sync(&cl); - goto err; - } - - /* Wait for new btree roots to be written: */ - closure_sync(&cl); - - bch_inode_init(c, &inode, 0, 0, - S_IFDIR|S_IRWXU|S_IRUGO|S_IXUGO, 0); - inode.inum = BCACHE_ROOT_INO; - - bch_inode_pack(&packed_inode, &inode); - - err = "error creating root directory"; - if (bch_btree_insert(c, BTREE_ID_INODES, - &packed_inode.inode.k_i, - NULL, NULL, NULL, 0)) - goto err; - - err = "error writing first journal entry"; - if (bch_journal_meta(&c->journal)) - goto err; - } -recovery_done: - err = "dynamic fault"; - if (bch_fs_init_fault("fs_start")) - goto err; - - if (c->opts.read_only) { - bch_fs_read_only(c); - } else { - err = bch_fs_read_write(c); - if (err) - goto err; - } - - mutex_lock(&c->sb_lock); - mi = bch_sb_get_members(c->disk_sb); - now = ktime_get_seconds(); - - for_each_member_device(ca, c, i) - mi->members[ca->dev_idx].last_mount = cpu_to_le64(now); - - SET_BCH_SB_INITIALIZED(c->disk_sb, true); - SET_BCH_SB_CLEAN(c->disk_sb, false); - c->disk_sb->version = BCACHE_SB_VERSION_CDEV; - - bch_write_super(c); - mutex_unlock(&c->sb_lock); - - err = NULL; -out: - bch_journal_entries_free(&journal); - return err; -err: - switch (ret) { - case BCH_FSCK_ERRORS_NOT_FIXED: - bch_err(c, "filesystem contains errors: please report this to the developers"); - pr_cont("mount with -o fix_errors to repair"); - err = "fsck error"; - break; - case BCH_FSCK_REPAIR_UNIMPLEMENTED: - bch_err(c, "filesystem contains errors: please report this to the developers"); - pr_cont("repair unimplemented: inform the developers so that it can be added"); - err = "fsck error"; - break; - case BCH_FSCK_REPAIR_IMPOSSIBLE: - bch_err(c, "filesystem contains errors, but repair impossible"); - err = "fsck error"; - break; - case BCH_FSCK_UNKNOWN_VERSION: - err = "unknown metadata version";; - break; - case -ENOMEM: - err = "cannot allocate memory"; - break; - case -EIO: - err = "IO error"; - break; - } - - BUG_ON(!err); - set_bit(BCH_FS_ERROR, &c->flags); - goto out; -} - -const char *bch_fs_start(struct bch_fs *c) -{ - return __bch_fs_start(c) ?: bch_fs_online(c); -} - -static const char *bch_dev_may_add(struct bch_sb *sb, struct bch_fs *c) -{ - struct bch_sb_field_members *sb_mi; - - sb_mi = bch_sb_get_members(sb); - if (!sb_mi) - return "Invalid superblock: member info area missing"; - - if (le16_to_cpu(sb->block_size) != c->sb.block_size) - return "mismatched block size"; - - if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) < - BCH_SB_BTREE_NODE_SIZE(c->disk_sb)) - return "new cache bucket size is too small"; - - return NULL; -} - -static const char *bch_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb) -{ - struct bch_sb *newest = - le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb; - struct bch_sb_field_members *mi = bch_sb_get_members(newest); - - if (uuid_le_cmp(fs->uuid, sb->uuid)) - return "device not a member of filesystem"; - - if (sb->dev_idx >= newest->nr_devices) - return "device has invalid dev_idx"; - - if (bch_is_zero(mi->members[sb->dev_idx].uuid.b, sizeof(uuid_le))) - return "device has been removed"; - - if (fs->block_size != sb->block_size) - return "mismatched block size"; - - return NULL; -} - -/* Device startup/shutdown: */ - -void bch_dev_release(struct kobject *kobj) -{ - struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj); - - kfree(ca); -} - -static void bch_dev_free(struct bch_dev *ca) -{ - unsigned i; - - cancel_work_sync(&ca->io_error_work); - - if (ca->kobj.state_in_sysfs && - ca->disk_sb.bdev) - sysfs_remove_link(&part_to_dev(ca->disk_sb.bdev->bd_part)->kobj, - "bcache"); - - if (ca->kobj.state_in_sysfs) - kobject_del(&ca->kobj); - - bch_free_super(&ca->disk_sb); - bch_dev_journal_exit(ca); - - free_percpu(ca->sectors_written); - bioset_exit(&ca->replica_set); - free_percpu(ca->usage_percpu); - free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca))); - kfree(ca->prio_buckets); - kfree(ca->bio_prio); - vfree(ca->buckets); - vfree(ca->oldest_gens); - free_heap(&ca->heap); - free_fifo(&ca->free_inc); - - for (i = 0; i < RESERVE_NR; i++) - free_fifo(&ca->free[i]); - - percpu_ref_exit(&ca->io_ref); - percpu_ref_exit(&ca->ref); - kobject_put(&ca->kobj); -} - -static void bch_dev_io_ref_release(struct percpu_ref *ref) -{ - struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref); - - complete(&ca->offline_complete); -} - -static void __bch_dev_offline(struct bch_dev *ca) -{ - struct bch_fs *c = ca->fs; - - lockdep_assert_held(&c->state_lock); - - __bch_dev_read_only(ca->fs, ca); - - reinit_completion(&ca->offline_complete); - percpu_ref_kill(&ca->io_ref); - wait_for_completion(&ca->offline_complete); - - if (ca->kobj.state_in_sysfs) { - struct kobject *block = - &part_to_dev(ca->disk_sb.bdev->bd_part)->kobj; - - sysfs_remove_link(block, "bcache"); - sysfs_remove_link(&ca->kobj, "block"); - } - - bch_free_super(&ca->disk_sb); - bch_dev_journal_exit(ca); -} - -static void bch_dev_ref_release(struct percpu_ref *ref) -{ - struct bch_dev *ca = container_of(ref, struct bch_dev, ref); - - complete(&ca->stop_complete); -} - -static void bch_dev_stop(struct bch_dev *ca) -{ - struct bch_fs *c = ca->fs; - - lockdep_assert_held(&c->state_lock); - - BUG_ON(rcu_access_pointer(c->devs[ca->dev_idx]) != ca); - rcu_assign_pointer(c->devs[ca->dev_idx], NULL); - - synchronize_rcu(); - - reinit_completion(&ca->stop_complete); - percpu_ref_kill(&ca->ref); - wait_for_completion(&ca->stop_complete); -} - -static int bch_dev_sysfs_online(struct bch_dev *ca) -{ - struct bch_fs *c = ca->fs; - int ret; - - if (!c->kobj.state_in_sysfs) - return 0; - - if (!ca->kobj.state_in_sysfs) { - ret = kobject_add(&ca->kobj, &ca->fs->kobj, - "dev-%u", ca->dev_idx); - if (ret) - return ret; - } - - if (ca->disk_sb.bdev) { - struct kobject *block = - &part_to_dev(ca->disk_sb.bdev->bd_part)->kobj; - - ret = sysfs_create_link(block, &ca->kobj, "bcache"); - if (ret) - return ret; - ret = sysfs_create_link(&ca->kobj, block, "block"); - if (ret) - return ret; - } - - return 0; -} - -static int bch_dev_alloc(struct bch_fs *c, unsigned dev_idx) -{ - struct bch_member *member; - size_t reserve_none, movinggc_reserve, free_inc_reserve, total_reserve; - size_t heap_size; - unsigned i; - struct bch_dev *ca; - - if (bch_fs_init_fault("dev_alloc")) - return -ENOMEM; - - ca = kzalloc(sizeof(*ca), GFP_KERNEL); - if (!ca) - return -ENOMEM; - - kobject_init(&ca->kobj, &bch_dev_ktype); - init_completion(&ca->stop_complete); - init_completion(&ca->offline_complete); - - spin_lock_init(&ca->self.lock); - ca->self.nr = 1; - rcu_assign_pointer(ca->self.d[0].dev, ca); - ca->dev_idx = dev_idx; - - spin_lock_init(&ca->freelist_lock); - spin_lock_init(&ca->prio_buckets_lock); - mutex_init(&ca->heap_lock); - bch_dev_moving_gc_init(ca); - - INIT_WORK(&ca->io_error_work, bch_nonfatal_io_error_work); - - if (bch_fs_init_fault("dev_alloc")) - goto err; - - member = bch_sb_get_members(c->disk_sb)->members + dev_idx; - - ca->mi = bch_mi_to_cpu(member); - ca->uuid = member->uuid; - ca->bucket_bits = ilog2(ca->mi.bucket_size); - scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx); - - /* XXX: tune these */ - movinggc_reserve = max_t(size_t, 16, ca->mi.nbuckets >> 7); - reserve_none = max_t(size_t, 4, ca->mi.nbuckets >> 9); - /* - * free_inc must be smaller than the copygc reserve: if it was bigger, - * one copygc iteration might not make enough buckets available to fill - * up free_inc and allow the allocator to make forward progress - */ - free_inc_reserve = movinggc_reserve / 2; - heap_size = movinggc_reserve * 8; - - if (percpu_ref_init(&ca->ref, bch_dev_ref_release, - 0, GFP_KERNEL) || - percpu_ref_init(&ca->io_ref, bch_dev_io_ref_release, - PERCPU_REF_INIT_DEAD, GFP_KERNEL) || - !init_fifo(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) || - !init_fifo(&ca->free[RESERVE_BTREE], BTREE_NODE_RESERVE, GFP_KERNEL) || - !init_fifo(&ca->free[RESERVE_MOVINGGC], - movinggc_reserve, GFP_KERNEL) || - !init_fifo(&ca->free[RESERVE_NONE], reserve_none, GFP_KERNEL) || - !init_fifo(&ca->free_inc, free_inc_reserve, GFP_KERNEL) || - !init_heap(&ca->heap, heap_size, GFP_KERNEL) || - !(ca->oldest_gens = vzalloc(sizeof(u8) * - ca->mi.nbuckets)) || - !(ca->buckets = vzalloc(sizeof(struct bucket) * - ca->mi.nbuckets)) || - !(ca->prio_buckets = kzalloc(sizeof(u64) * prio_buckets(ca) * - 2, GFP_KERNEL)) || - !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)) || - !(ca->usage_percpu = alloc_percpu(struct bch_dev_usage)) || - !(ca->bio_prio = bio_kmalloc(GFP_NOIO, bucket_pages(ca))) || - bioset_init(&ca->replica_set, 4, - offsetof(struct bch_write_bio, bio)) || - !(ca->sectors_written = alloc_percpu(*ca->sectors_written))) - goto err; - - ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca); - - total_reserve = ca->free_inc.size; - for (i = 0; i < RESERVE_NR; i++) - total_reserve += ca->free[i].size; - - ca->copygc_write_point.group = &ca->self; - ca->tiering_write_point.group = &ca->self; - - ca->fs = c; - rcu_assign_pointer(c->devs[ca->dev_idx], ca); - - if (bch_dev_sysfs_online(ca)) - pr_warn("error creating sysfs objects"); - - return 0; -err: - bch_dev_free(ca); - return -ENOMEM; -} - -static int __bch_dev_online(struct bch_fs *c, struct bcache_superblock *sb) -{ - struct bch_dev *ca; - int ret; - - lockdep_assert_held(&c->sb_lock); - - if (le64_to_cpu(sb->sb->seq) > - le64_to_cpu(c->disk_sb->seq)) - bch_sb_to_fs(c, sb->sb); - - BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices || - !c->devs[sb->sb->dev_idx]); - - ca = c->devs[sb->sb->dev_idx]; - if (ca->disk_sb.bdev) { - bch_err(c, "already have device online in slot %u", - sb->sb->dev_idx); - return -EINVAL; - } - - ret = bch_dev_journal_init(ca, sb->sb); - if (ret) - return ret; - - /* - * Increase journal write timeout if flushes to this device are - * expensive: - */ - if (!blk_queue_nonrot(bdev_get_queue(sb->bdev)) && - journal_flushes_device(ca)) - c->journal.write_delay_ms = - max(c->journal.write_delay_ms, 1000U); - - /* Commit: */ - ca->disk_sb = *sb; - if (sb->mode & FMODE_EXCL) - ca->disk_sb.bdev->bd_holder = ca; - memset(sb, 0, sizeof(*sb)); - - if (c->sb.nr_devices == 1) - bdevname(ca->disk_sb.bdev, c->name); - bdevname(ca->disk_sb.bdev, ca->name); - - if (bch_dev_sysfs_online(ca)) - pr_warn("error creating sysfs objects"); - - lg_local_lock(&c->usage_lock); - if (!gc_will_visit(c, gc_phase(GC_PHASE_SB_METADATA))) - bch_mark_dev_metadata(ca->fs, ca); - lg_local_unlock(&c->usage_lock); - - percpu_ref_reinit(&ca->io_ref); - return 0; -} - -/* Device management: */ - -bool bch_fs_may_start(struct bch_fs *c, int flags) -{ - struct bch_sb_field_members *mi; - unsigned meta_missing = 0; - unsigned data_missing = 0; - bool degraded = false; - unsigned i; - - mutex_lock(&c->sb_lock); - mi = bch_sb_get_members(c->disk_sb); - - for (i = 0; i < c->disk_sb->nr_devices; i++) - if (!c->devs[i] && - !bch_is_zero(mi->members[i].uuid.b, sizeof(uuid_le))) { - degraded = true; - if (BCH_MEMBER_HAS_METADATA(&mi->members[i])) - meta_missing++; - if (BCH_MEMBER_HAS_DATA(&mi->members[i])) - data_missing++; - } - mutex_unlock(&c->sb_lock); - - if (degraded && - !(flags & BCH_FORCE_IF_DEGRADED)) - return false; - - if (meta_missing && - !(flags & BCH_FORCE_IF_METADATA_DEGRADED)) - return false; - - if (meta_missing >= BCH_SB_META_REPLICAS_HAVE(c->disk_sb) && - !(flags & BCH_FORCE_IF_METADATA_LOST)) - return false; - - if (data_missing && !(flags & BCH_FORCE_IF_DATA_DEGRADED)) - return false; - - if (data_missing >= BCH_SB_DATA_REPLICAS_HAVE(c->disk_sb) && - !(flags & BCH_FORCE_IF_DATA_LOST)) - return false; - - return true; -} - -bool bch_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca, - enum bch_member_state new_state, int flags) -{ - lockdep_assert_held(&c->state_lock); - - if (new_state == BCH_MEMBER_STATE_RW) - return true; - - if (ca->mi.has_data && - !(flags & BCH_FORCE_IF_DATA_DEGRADED)) - return false; - - if (ca->mi.has_data && - c->sb.data_replicas_have <= 1 && - !(flags & BCH_FORCE_IF_DATA_LOST)) - return false; - - if (ca->mi.has_metadata && - !(flags & BCH_FORCE_IF_METADATA_DEGRADED)) - return false; - - if (ca->mi.has_metadata && - c->sb.meta_replicas_have <= 1 && - !(flags & BCH_FORCE_IF_METADATA_LOST)) - return false; - - return true; -} - -static void __bch_dev_read_only(struct bch_fs *c, struct bch_dev *ca) -{ - bch_moving_gc_stop(ca); - - /* - * This stops new data writes (e.g. to existing open data - * buckets) and then waits for all existing writes to - * complete. - */ - bch_dev_allocator_stop(ca); - - bch_dev_group_remove(&c->journal.devs, ca); -} - -static const char *__bch_dev_read_write(struct bch_fs *c, struct bch_dev *ca) -{ - lockdep_assert_held(&c->state_lock); - - BUG_ON(ca->mi.state != BCH_MEMBER_STATE_RW); - - trace_bcache_cache_read_write(ca); - - if (bch_dev_allocator_start(ca)) - return "error starting allocator thread"; - - if (bch_moving_gc_start(ca)) - return "error starting moving GC thread"; - - if (bch_tiering_start(c)) - return "error starting tiering thread"; - - bch_notify_dev_read_write(ca); - trace_bcache_cache_read_write_done(ca); - - return NULL; -} - -int __bch_dev_set_state(struct bch_fs *c, struct bch_dev *ca, - enum bch_member_state new_state, int flags) -{ - struct bch_sb_field_members *mi; - - if (ca->mi.state == new_state) - return 0; - - if (!bch_dev_state_allowed(c, ca, new_state, flags)) - return -EINVAL; - - if (new_state == BCH_MEMBER_STATE_RW) { - if (__bch_dev_read_write(c, ca)) - return -ENOMEM; - } else { - __bch_dev_read_only(c, ca); - } - - bch_notice(ca, "%s", bch_dev_state[new_state]); - - mutex_lock(&c->sb_lock); - mi = bch_sb_get_members(c->disk_sb); - SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state); - bch_write_super(c); - mutex_unlock(&c->sb_lock); - - return 0; -} - -int bch_dev_set_state(struct bch_fs *c, struct bch_dev *ca, - enum bch_member_state new_state, int flags) -{ - int ret; - - mutex_lock(&c->state_lock); - ret = __bch_dev_set_state(c, ca, new_state, flags); - mutex_unlock(&c->state_lock); - - return ret; -} - -/* Device add/removal: */ - -int bch_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags) -{ - struct bch_sb_field_members *mi; - unsigned dev_idx = ca->dev_idx; - int ret = -EINVAL; - - mutex_lock(&c->state_lock); - - percpu_ref_put(&ca->ref); /* XXX */ - - if (ca->mi.state == BCH_MEMBER_STATE_RW) { - bch_err(ca, "Cannot remove RW device"); - goto err; - } - - if (!bch_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) { - bch_err(ca, "Cannot remove without losing data"); - goto err; - } - - /* - * XXX: verify that dev_idx is really not in use anymore, anywhere - * - * flag_data_bad() does not check btree pointers - */ - ret = bch_flag_data_bad(ca); - if (ret) { - bch_err(ca, "Remove failed"); - goto err; - } - - if (ca->mi.has_data || ca->mi.has_metadata) { - bch_err(ca, "Remove failed, still has data"); - goto err; - } - - /* - * Ok, really doing the remove: - * Drop device's prio pointer before removing it from superblock: - */ - spin_lock(&c->journal.lock); - c->journal.prio_buckets[dev_idx] = 0; - spin_unlock(&c->journal.lock); - - bch_journal_meta(&c->journal); - - __bch_dev_offline(ca); - bch_dev_stop(ca); - bch_dev_free(ca); - - /* - * Free this device's slot in the bch_member array - all pointers to - * this device must be gone: - */ - mutex_lock(&c->sb_lock); - mi = bch_sb_get_members(c->disk_sb); - memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid)); - - bch_write_super(c); - - mutex_unlock(&c->sb_lock); - mutex_unlock(&c->state_lock); - return 0; -err: - mutex_unlock(&c->state_lock); - return ret; -} - -int bch_dev_add(struct bch_fs *c, const char *path) -{ - struct bcache_superblock sb; - const char *err; - struct bch_dev *ca = NULL; - struct bch_sb_field_members *mi, *dev_mi; - struct bch_member saved_mi; - unsigned dev_idx, nr_devices, u64s; - int ret = -EINVAL; - - err = bch_read_super(&sb, bch_opts_empty(), path); - if (err) - return -EINVAL; - - err = bch_validate_cache_super(&sb); - if (err) - return -EINVAL; - - err = bch_dev_may_add(sb.sb, c); - if (err) - return -EINVAL; - - mutex_lock(&c->state_lock); - mutex_lock(&c->sb_lock); - - /* - * Preserve the old cache member information (esp. tier) - * before we start bashing the disk stuff. - */ - dev_mi = bch_sb_get_members(sb.sb); - saved_mi = dev_mi->members[sb.sb->dev_idx]; - saved_mi.last_mount = cpu_to_le64(ktime_get_seconds()); - - if (dynamic_fault("bcache:add:no_slot")) - goto no_slot; - - mi = bch_sb_get_members(c->disk_sb); - for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) - if (dev_idx >= c->sb.nr_devices || - bch_is_zero(mi->members[dev_idx].uuid.b, - sizeof(uuid_le))) - goto have_slot; -no_slot: - err = "no slots available in superblock"; - ret = -ENOSPC; - goto err_unlock; - -have_slot: - nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices); - u64s = (sizeof(struct bch_sb_field_members) + - sizeof(struct bch_member) * nr_devices) / sizeof(u64); - err = "no space in superblock for member info"; - - mi = bch_fs_sb_resize_members(c, u64s); - if (!mi) - goto err_unlock; - - dev_mi = bch_sb_resize_members(&sb, u64s); - if (!dev_mi) - goto err_unlock; - - memcpy(dev_mi, mi, u64s * sizeof(u64)); - dev_mi->members[dev_idx] = saved_mi; - - sb.sb->uuid = c->disk_sb->uuid; - sb.sb->dev_idx = dev_idx; - sb.sb->nr_devices = nr_devices; - - /* commit new member info */ - memcpy(mi, dev_mi, u64s * sizeof(u64)); - c->disk_sb->nr_devices = nr_devices; - c->sb.nr_devices = nr_devices; - - if (bch_dev_alloc(c, dev_idx)) { - err = "cannot allocate memory"; - ret = -ENOMEM; - goto err_unlock; - } - - if (__bch_dev_online(c, &sb)) { - err = "bch_dev_online() error"; - ret = -ENOMEM; - goto err_unlock; - } - - bch_write_super(c); - mutex_unlock(&c->sb_lock); - - ca = c->devs[dev_idx]; - if (ca->mi.state == BCH_MEMBER_STATE_RW) { - err = "journal alloc failed"; - if (bch_dev_journal_alloc(ca)) - goto err; - - err = __bch_dev_read_write(c, ca); - if (err) - goto err; - } - - bch_notify_dev_added(ca); - mutex_unlock(&c->state_lock); - return 0; -err_unlock: - mutex_unlock(&c->sb_lock); -err: - mutex_unlock(&c->state_lock); - bch_free_super(&sb); - - bch_err(c, "Unable to add device: %s", err); - return ret ?: -EINVAL; -} - -int bch_dev_online(struct bch_fs *c, const char *path) -{ - struct bcache_superblock sb = { 0 }; - struct bch_dev *ca; - unsigned dev_idx; - const char *err; - - mutex_lock(&c->state_lock); - - err = bch_read_super(&sb, bch_opts_empty(), path); - if (err) - goto err; - - dev_idx = sb.sb->dev_idx; - - err = bch_dev_in_fs(c->disk_sb, sb.sb); - if (err) - goto err; - - mutex_lock(&c->sb_lock); - if (__bch_dev_online(c, &sb)) { - err = "__bch_dev_online() error"; - mutex_unlock(&c->sb_lock); - goto err; - } - mutex_unlock(&c->sb_lock); - - ca = c->devs[dev_idx]; - if (ca->mi.state == BCH_MEMBER_STATE_RW) { - err = __bch_dev_read_write(c, ca); - if (err) - goto err; - } - - mutex_unlock(&c->state_lock); - return 0; -err: - mutex_unlock(&c->state_lock); - bch_free_super(&sb); - bch_err(c, "error bringing %s online: %s", path, err); - return -EINVAL; -} - -int bch_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags) -{ - mutex_lock(&c->state_lock); - - if (!bch_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) { - bch_err(ca, "Cannot offline required disk"); - mutex_unlock(&c->state_lock); - return -EINVAL; - } - - __bch_dev_read_only(c, ca); - __bch_dev_offline(ca); - - mutex_unlock(&c->state_lock); - return 0; -} - -int bch_dev_evacuate(struct bch_fs *c, struct bch_dev *ca) -{ - int ret; - - mutex_lock(&c->state_lock); - - if (ca->mi.state == BCH_MEMBER_STATE_RW) { - bch_err(ca, "Cannot migrate data off RW device"); - mutex_unlock(&c->state_lock); - return -EINVAL; - } - - mutex_unlock(&c->state_lock); - - ret = bch_move_data_off_device(ca); - if (ret) { - bch_err(ca, "Error migrating data: %i", ret); - return ret; - } - - ret = bch_move_metadata_off_device(ca); - if (ret) { - bch_err(ca, "Error migrating metadata: %i", ret); - return ret; - } - - if (ca->mi.has_data || ca->mi.has_metadata) { - bch_err(ca, "Migrate error: data still present"); - return -EINVAL; - } - - return 0; -} - -/* Filesystem open: */ - -const char *bch_fs_open(char * const *devices, unsigned nr_devices, - struct bch_opts opts, struct bch_fs **ret) -{ - const char *err; - struct bch_fs *c = NULL; - struct bcache_superblock *sb; - unsigned i, best_sb = 0; - - if (!nr_devices) - return "need at least one device"; - - if (!try_module_get(THIS_MODULE)) - return "module unloading"; - - err = "cannot allocate memory"; - sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL); - if (!sb) - goto err; - - for (i = 0; i < nr_devices; i++) { - err = bch_read_super(&sb[i], opts, devices[i]); - if (err) - goto err; - - err = "attempting to register backing device"; - if (__SB_IS_BDEV(le64_to_cpu(sb[i].sb->version))) - goto err; - - err = bch_validate_cache_super(&sb[i]); - if (err) - goto err; - } - - for (i = 1; i < nr_devices; i++) - if (le64_to_cpu(sb[i].sb->seq) > - le64_to_cpu(sb[best_sb].sb->seq)) - best_sb = i; - - for (i = 0; i < nr_devices; i++) { - err = bch_dev_in_fs(sb[best_sb].sb, sb[i].sb); - if (err) - goto err; - } - - err = "cannot allocate memory"; - c = bch_fs_alloc(sb[best_sb].sb, opts); - if (!c) - goto err; - - err = "bch_dev_online() error"; - mutex_lock(&c->sb_lock); - for (i = 0; i < nr_devices; i++) - if (__bch_dev_online(c, &sb[i])) { - mutex_unlock(&c->sb_lock); - goto err; - } - mutex_unlock(&c->sb_lock); - - err = "insufficient devices"; - if (!bch_fs_may_start(c, 0)) - goto err; - - if (!c->opts.nostart) { - err = __bch_fs_start(c); - if (err) - goto err; - } - - err = bch_fs_online(c); - if (err) - goto err; - - if (ret) - *ret = c; - else - closure_put(&c->cl); - - err = NULL; -out: - kfree(sb); - module_put(THIS_MODULE); - if (err) - c = NULL; - return err; -err: - if (c) - bch_fs_stop(c); - - for (i = 0; i < nr_devices; i++) - bch_free_super(&sb[i]); - goto out; -} - -static const char *__bch_fs_open_incremental(struct bcache_superblock *sb, - struct bch_opts opts) -{ - const char *err; - struct bch_fs *c; - bool allocated_fs = false; - - err = bch_validate_cache_super(sb); - if (err) - return err; - - mutex_lock(&bch_fs_list_lock); - c = __bch_uuid_to_fs(sb->sb->uuid); - if (c) { - closure_get(&c->cl); - - err = bch_dev_in_fs(c->disk_sb, sb->sb); - if (err) - goto err; - } else { - c = bch_fs_alloc(sb->sb, opts); - err = "cannot allocate memory"; - if (!c) - goto err; - - allocated_fs = true; - } - - err = "bch_dev_online() error"; - - mutex_lock(&c->sb_lock); - if (__bch_dev_online(c, sb)) { - mutex_unlock(&c->sb_lock); - goto err; - } - mutex_unlock(&c->sb_lock); - - if (!c->opts.nostart && bch_fs_may_start(c, 0)) { - err = __bch_fs_start(c); - if (err) - goto err; - } - - err = __bch_fs_online(c); - if (err) - goto err; - - closure_put(&c->cl); - mutex_unlock(&bch_fs_list_lock); - - return NULL; -err: - mutex_unlock(&bch_fs_list_lock); - - if (allocated_fs) - bch_fs_stop(c); - else if (c) - closure_put(&c->cl); - - return err; -} - -const char *bch_fs_open_incremental(const char *path) -{ - struct bcache_superblock sb; - struct bch_opts opts = bch_opts_empty(); - const char *err; - - err = bch_read_super(&sb, opts, path); - if (err) - return err; - - if (__SB_IS_BDEV(le64_to_cpu(sb.sb->version))) { - mutex_lock(&bch_fs_list_lock); - err = bch_backing_dev_register(&sb); - mutex_unlock(&bch_fs_list_lock); - } else { - err = __bch_fs_open_incremental(&sb, opts); - } - - bch_free_super(&sb); - - return err; -} - -/* Global interfaces/init */ - -#define kobj_attribute_write(n, fn) \ - static struct kobj_attribute ksysfs_##n = __ATTR(n, S_IWUSR, NULL, fn) - -#define kobj_attribute_rw(n, show, store) \ - static struct kobj_attribute ksysfs_##n = \ - __ATTR(n, S_IWUSR|S_IRUSR, show, store) - -static ssize_t register_bcache(struct kobject *, struct kobj_attribute *, - const char *, size_t); - -kobj_attribute_write(register, register_bcache); -kobj_attribute_write(register_quiet, register_bcache); - -static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, - const char *buffer, size_t size) -{ - ssize_t ret = -EINVAL; - const char *err = "cannot allocate memory"; - char *path = NULL; - - if (!try_module_get(THIS_MODULE)) - return -EBUSY; - - if (!(path = kstrndup(skip_spaces(buffer), size, GFP_KERNEL))) - goto err; - - err = bch_fs_open_incremental(strim(path)); - if (err) - goto err; - - ret = size; -out: - kfree(path); - module_put(THIS_MODULE); - return ret; -err: - pr_err("error opening %s: %s", path, err); - goto out; -} - -static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) -{ - if (code == SYS_DOWN || - code == SYS_HALT || - code == SYS_POWER_OFF) { - struct bch_fs *c; - - mutex_lock(&bch_fs_list_lock); - - if (!list_empty(&bch_fs_list)) - pr_info("Setting all devices read only:"); - - list_for_each_entry(c, &bch_fs_list, list) - bch_fs_read_only_async(c); - - list_for_each_entry(c, &bch_fs_list, list) - bch_fs_read_only(c); - - mutex_unlock(&bch_fs_list_lock); - } - - return NOTIFY_DONE; -} - -static struct notifier_block reboot = { - .notifier_call = bcache_reboot, - .priority = INT_MAX, /* before any real devices */ -}; - -static ssize_t reboot_test(struct kobject *k, struct kobj_attribute *attr, - const char *buffer, size_t size) -{ - bcache_reboot(NULL, SYS_DOWN, NULL); - return size; -} - -kobj_attribute_write(reboot, reboot_test); - -static void bcache_exit(void) -{ - bch_debug_exit(); - bch_vfs_exit(); - bch_blockdev_exit(); - bch_chardev_exit(); - if (bcache_kset) - kset_unregister(bcache_kset); - if (bcache_io_wq) - destroy_workqueue(bcache_io_wq); - if (!IS_ERR_OR_NULL(bch_sha256)) - crypto_free_shash(bch_sha256); - unregister_reboot_notifier(&reboot); -} - -static int __init bcache_init(void) -{ - static const struct attribute *files[] = { - &ksysfs_register.attr, - &ksysfs_register_quiet.attr, - &ksysfs_reboot.attr, - NULL - }; - - register_reboot_notifier(&reboot); - closure_debug_init(); - bkey_pack_test(); - - bch_sha256 = crypto_alloc_shash("sha256", 0, 0); - if (IS_ERR(bch_sha256)) - goto err; - - if (!(bcache_io_wq = create_freezable_workqueue("bcache_io")) || - !(bcache_kset = kset_create_and_add("bcache", NULL, fs_kobj)) || - sysfs_create_files(&bcache_kset->kobj, files) || - bch_chardev_init() || - bch_blockdev_init() || - bch_vfs_init() || - bch_debug_init()) - goto err; - - return 0; -err: - bcache_exit(); - return -ENOMEM; -} - -#define BCH_DEBUG_PARAM(name, description) \ - bool bch_##name; \ - module_param_named(name, bch_##name, bool, 0644); \ - MODULE_PARM_DESC(name, description); -BCH_DEBUG_PARAMS() -#undef BCH_DEBUG_PARAM - -module_exit(bcache_exit); -module_init(bcache_init); |