diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/bcachefs/super.c | 2030 |
1 files changed, 2030 insertions, 0 deletions
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c new file mode 100644 index 0000000000..818ec467a0 --- /dev/null +++ b/fs/bcachefs/super.c @@ -0,0 +1,2030 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bcachefs 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 "bcachefs.h" +#include "alloc_background.h" +#include "alloc_foreground.h" +#include "bkey_sort.h" +#include "btree_cache.h" +#include "btree_gc.h" +#include "btree_journal_iter.h" +#include "btree_key_cache.h" +#include "btree_update_interior.h" +#include "btree_io.h" +#include "btree_write_buffer.h" +#include "buckets_waiting_for_journal.h" +#include "chardev.h" +#include "checksum.h" +#include "clock.h" +#include "compress.h" +#include "counters.h" +#include "debug.h" +#include "disk_groups.h" +#include "ec.h" +#include "errcode.h" +#include "error.h" +#include "fs.h" +#include "fs-io.h" +#include "fs-io-buffered.h" +#include "fs-io-direct.h" +#include "fsck.h" +#include "inode.h" +#include "io_read.h" +#include "io_write.h" +#include "journal.h" +#include "journal_reclaim.h" +#include "journal_seq_blacklist.h" +#include "move.h" +#include "migrate.h" +#include "movinggc.h" +#include "nocow_locking.h" +#include "quota.h" +#include "rebalance.h" +#include "recovery.h" +#include "replicas.h" +#include "sb-clean.h" +#include "sb-errors.h" +#include "sb-members.h" +#include "snapshot.h" +#include "subvolume.h" +#include "super.h" +#include "super-io.h" +#include "sysfs.h" +#include "trace.h" + +#include <linux/backing-dev.h> +#include <linux/blkdev.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/idr.h> +#include <linux/module.h> +#include <linux/percpu.h> +#include <linux/random.h> +#include <linux/sysfs.h> +#include <crypto/hash.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); +MODULE_DESCRIPTION("bcachefs filesystem"); +MODULE_SOFTDEP("pre: crc32c"); +MODULE_SOFTDEP("pre: crc64"); +MODULE_SOFTDEP("pre: sha256"); +MODULE_SOFTDEP("pre: chacha20"); +MODULE_SOFTDEP("pre: poly1305"); +MODULE_SOFTDEP("pre: xxhash"); + +#define KTYPE(type) \ +static const struct attribute_group type ## _group = { \ + .attrs = type ## _files \ +}; \ + \ +static const struct attribute_group *type ## _groups[] = { \ + &type ## _group, \ + NULL \ +}; \ + \ +static const struct kobj_type type ## _ktype = { \ + .release = type ## _release, \ + .sysfs_ops = &type ## _sysfs_ops, \ + .default_groups = type ## _groups \ +} + +static void bch2_fs_release(struct kobject *); +static void bch2_dev_release(struct kobject *); +static void bch2_fs_counters_release(struct kobject *k) +{ +} + +static void bch2_fs_internal_release(struct kobject *k) +{ +} + +static void bch2_fs_opts_dir_release(struct kobject *k) +{ +} + +static void bch2_fs_time_stats_release(struct kobject *k) +{ +} + +KTYPE(bch2_fs); +KTYPE(bch2_fs_counters); +KTYPE(bch2_fs_internal); +KTYPE(bch2_fs_opts_dir); +KTYPE(bch2_fs_time_stats); +KTYPE(bch2_dev); + +static struct kset *bcachefs_kset; +static LIST_HEAD(bch_fs_list); +static DEFINE_MUTEX(bch_fs_list_lock); + +DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait); + +static void bch2_dev_free(struct bch_dev *); +static int bch2_dev_alloc(struct bch_fs *, unsigned); +static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *); +static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *); + +struct bch_fs *bch2_dev_to_fs(dev_t dev) +{ + 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, NULL) + if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) { + closure_get(&c->cl); + goto found; + } + c = NULL; +found: + rcu_read_unlock(); + mutex_unlock(&bch_fs_list_lock); + + return c; +} + +static struct bch_fs *__bch2_uuid_to_fs(__uuid_t 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.sb->uuid, &uuid, sizeof(uuid))) + return c; + + return NULL; +} + +struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid) +{ + struct bch_fs *c; + + mutex_lock(&bch_fs_list_lock); + c = __bch2_uuid_to_fs(uuid); + if (c) + closure_get(&c->cl); + mutex_unlock(&bch_fs_list_lock); + + return c; +} + +static void bch2_dev_usage_journal_reserve(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i, nr = 0, u64s = + ((sizeof(struct jset_entry_dev_usage) + + sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) / + sizeof(u64); + + rcu_read_lock(); + for_each_member_device_rcu(ca, c, i, NULL) + nr++; + rcu_read_unlock(); + + bch2_journal_entry_res_resize(&c->journal, + &c->dev_usage_journal_res, u64s * nr); +} + +/* Filesystem RO/RW: */ + +/* + * For startup/shutdown of RW stuff, the dependencies are: + * + * - foreground writes depend on copygc and rebalance (to free up space) + * + * - copygc and rebalance 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 __bch2_fs_read_only(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i, clean_passes = 0; + u64 seq = 0; + + bch2_fs_ec_stop(c); + bch2_open_buckets_stop(c, NULL, true); + bch2_rebalance_stop(c); + bch2_copygc_stop(c); + bch2_gc_thread_stop(c); + bch2_fs_ec_flush(c); + + bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu", + journal_cur_seq(&c->journal)); + + do { + clean_passes++; + + if (bch2_btree_interior_updates_flush(c) || + bch2_journal_flush_all_pins(&c->journal) || + bch2_btree_flush_all_writes(c) || + seq != atomic64_read(&c->journal.seq)) { + seq = atomic64_read(&c->journal.seq); + clean_passes = 0; + } + } while (clean_passes < 2); + + bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu", + journal_cur_seq(&c->journal)); + + if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) && + !test_bit(BCH_FS_EMERGENCY_RO, &c->flags)) + set_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags); + bch2_fs_journal_stop(&c->journal); + + /* + * After stopping journal: + */ + for_each_member_device(ca, c, i) + bch2_dev_allocator_remove(c, ca); +} + +#ifndef BCH_WRITE_REF_DEBUG +static void bch2_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(&bch2_read_only_wait); +} +#endif + +void bch2_fs_read_only(struct bch_fs *c) +{ + if (!test_bit(BCH_FS_RW, &c->flags)) { + bch2_journal_reclaim_stop(&c->journal); + return; + } + + BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags)); + + /* + * Block new foreground-end write operations from starting - any new + * writes will return -EROFS: + */ + set_bit(BCH_FS_GOING_RO, &c->flags); +#ifndef BCH_WRITE_REF_DEBUG + percpu_ref_kill(&c->writes); +#else + for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) + bch2_write_ref_put(c, i); +#endif + + /* + * 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(bch2_read_only_wait, + test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) || + test_bit(BCH_FS_EMERGENCY_RO, &c->flags)); + + __bch2_fs_read_only(c); + + wait_event(bch2_read_only_wait, + test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags)); + + clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags); + clear_bit(BCH_FS_GOING_RO, &c->flags); + + if (!bch2_journal_error(&c->journal) && + !test_bit(BCH_FS_ERROR, &c->flags) && + !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) && + test_bit(BCH_FS_STARTED, &c->flags) && + test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags) && + !c->opts.norecovery) { + BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal)); + BUG_ON(atomic_read(&c->btree_cache.dirty)); + BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty)); + BUG_ON(c->btree_write_buffer.state.nr); + + bch_verbose(c, "marking filesystem clean"); + bch2_fs_mark_clean(c); + } + + clear_bit(BCH_FS_RW, &c->flags); +} + +static void bch2_fs_read_only_work(struct work_struct *work) +{ + struct bch_fs *c = + container_of(work, struct bch_fs, read_only_work); + + down_write(&c->state_lock); + bch2_fs_read_only(c); + up_write(&c->state_lock); +} + +static void bch2_fs_read_only_async(struct bch_fs *c) +{ + queue_work(system_long_wq, &c->read_only_work); +} + +bool bch2_fs_emergency_read_only(struct bch_fs *c) +{ + bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags); + + bch2_journal_halt(&c->journal); + bch2_fs_read_only_async(c); + + wake_up(&bch2_read_only_wait); + return ret; +} + +static int bch2_fs_read_write_late(struct bch_fs *c) +{ + int ret; + + /* + * Data move operations can't run until after check_snapshots has + * completed, and bch2_snapshot_is_ancestor() is available. + * + * Ideally we'd start copygc/rebalance earlier instead of waiting for + * all of recovery/fsck to complete: + */ + ret = bch2_copygc_start(c); + if (ret) { + bch_err(c, "error starting copygc thread"); + return ret; + } + + ret = bch2_rebalance_start(c); + if (ret) { + bch_err(c, "error starting rebalance thread"); + return ret; + } + + return 0; +} + +static int __bch2_fs_read_write(struct bch_fs *c, bool early) +{ + struct bch_dev *ca; + unsigned i; + int ret; + + if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) { + bch_err(c, "cannot go rw, unfixed btree errors"); + return -BCH_ERR_erofs_unfixed_errors; + } + + if (test_bit(BCH_FS_RW, &c->flags)) + return 0; + + if (c->opts.norecovery) + return -BCH_ERR_erofs_norecovery; + + /* + * nochanges is used for fsck -n mode - we have to allow going rw + * during recovery for that to work: + */ + if (c->opts.nochanges && (!early || c->opts.read_only)) + return -BCH_ERR_erofs_nochanges; + + bch_info(c, "going read-write"); + + ret = bch2_sb_members_v2_init(c); + if (ret) + goto err; + + ret = bch2_fs_mark_dirty(c); + if (ret) + goto err; + + clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags); + + /* + * First journal write must be a flush write: after a clean shutdown we + * don't read the journal, so the first journal write may end up + * overwriting whatever was there previously, and there must always be + * at least one non-flush write in the journal or recovery will fail: + */ + set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags); + + for_each_rw_member(ca, c, i) + bch2_dev_allocator_add(c, ca); + bch2_recalc_capacity(c); + + set_bit(BCH_FS_RW, &c->flags); + set_bit(BCH_FS_WAS_RW, &c->flags); + +#ifndef BCH_WRITE_REF_DEBUG + percpu_ref_reinit(&c->writes); +#else + for (i = 0; i < BCH_WRITE_REF_NR; i++) { + BUG_ON(atomic_long_read(&c->writes[i])); + atomic_long_inc(&c->writes[i]); + } +#endif + + ret = bch2_gc_thread_start(c); + if (ret) { + bch_err(c, "error starting gc thread"); + return ret; + } + + ret = bch2_journal_reclaim_start(&c->journal); + if (ret) + goto err; + + if (!early) { + ret = bch2_fs_read_write_late(c); + if (ret) + goto err; + } + + bch2_do_discards(c); + bch2_do_invalidates(c); + bch2_do_stripe_deletes(c); + bch2_do_pending_node_rewrites(c); + return 0; +err: + if (test_bit(BCH_FS_RW, &c->flags)) + bch2_fs_read_only(c); + else + __bch2_fs_read_only(c); + return ret; +} + +int bch2_fs_read_write(struct bch_fs *c) +{ + return __bch2_fs_read_write(c, false); +} + +int bch2_fs_read_write_early(struct bch_fs *c) +{ + lockdep_assert_held(&c->state_lock); + + return __bch2_fs_read_write(c, true); +} + +/* Filesystem startup/shutdown: */ + +static void __bch2_fs_free(struct bch_fs *c) +{ + unsigned i; + + for (i = 0; i < BCH_TIME_STAT_NR; i++) + bch2_time_stats_exit(&c->times[i]); + + bch2_free_pending_node_rewrites(c); + bch2_fs_sb_errors_exit(c); + bch2_fs_counters_exit(c); + bch2_fs_snapshots_exit(c); + bch2_fs_quota_exit(c); + bch2_fs_fs_io_direct_exit(c); + bch2_fs_fs_io_buffered_exit(c); + bch2_fs_fsio_exit(c); + bch2_fs_ec_exit(c); + bch2_fs_encryption_exit(c); + bch2_fs_nocow_locking_exit(c); + bch2_fs_io_write_exit(c); + bch2_fs_io_read_exit(c); + bch2_fs_buckets_waiting_for_journal_exit(c); + bch2_fs_btree_interior_update_exit(c); + bch2_fs_btree_iter_exit(c); + bch2_fs_btree_key_cache_exit(&c->btree_key_cache); + bch2_fs_btree_cache_exit(c); + bch2_fs_replicas_exit(c); + bch2_fs_journal_exit(&c->journal); + bch2_io_clock_exit(&c->io_clock[WRITE]); + bch2_io_clock_exit(&c->io_clock[READ]); + bch2_fs_compress_exit(c); + bch2_journal_keys_put_initial(c); + BUG_ON(atomic_read(&c->journal_keys.ref)); + bch2_fs_btree_write_buffer_exit(c); + percpu_free_rwsem(&c->mark_lock); + free_percpu(c->online_reserved); + + darray_exit(&c->btree_roots_extra); + free_percpu(c->pcpu); + mempool_exit(&c->large_bkey_pool); + mempool_exit(&c->btree_bounce_pool); + bioset_exit(&c->btree_bio); + mempool_exit(&c->fill_iter); +#ifndef BCH_WRITE_REF_DEBUG + percpu_ref_exit(&c->writes); +#endif + kfree(rcu_dereference_protected(c->disk_groups, 1)); + kfree(c->journal_seq_blacklist_table); + kfree(c->unused_inode_hints); + + if (c->write_ref_wq) + destroy_workqueue(c->write_ref_wq); + if (c->io_complete_wq) + destroy_workqueue(c->io_complete_wq); + if (c->copygc_wq) + destroy_workqueue(c->copygc_wq); + if (c->btree_io_complete_wq) + destroy_workqueue(c->btree_io_complete_wq); + if (c->btree_update_wq) + destroy_workqueue(c->btree_update_wq); + + bch2_free_super(&c->disk_sb); + kvpfree(c, sizeof(*c)); + module_put(THIS_MODULE); +} + +static void bch2_fs_release(struct kobject *kobj) +{ + struct bch_fs *c = container_of(kobj, struct bch_fs, kobj); + + __bch2_fs_free(c); +} + +void __bch2_fs_stop(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i; + + bch_verbose(c, "shutting down"); + + set_bit(BCH_FS_STOPPING, &c->flags); + + cancel_work_sync(&c->journal_seq_blacklist_gc_work); + + down_write(&c->state_lock); + bch2_fs_read_only(c); + up_write(&c->state_lock); + + for_each_member_device(ca, c, i) + if (ca->kobj.state_in_sysfs && + ca->disk_sb.bdev) + sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); + + if (c->kobj.state_in_sysfs) + kobject_del(&c->kobj); + + bch2_fs_debug_exit(c); + bch2_fs_chardev_exit(c); + + kobject_put(&c->counters_kobj); + kobject_put(&c->time_stats); + kobject_put(&c->opts_dir); + kobject_put(&c->internal); + + /* btree prefetch might have kicked off reads in the background: */ + bch2_btree_flush_all_reads(c); + + for_each_member_device(ca, c, i) + cancel_work_sync(&ca->io_error_work); + + cancel_work_sync(&c->read_only_work); +} + +void bch2_fs_free(struct bch_fs *c) +{ + unsigned i; + + mutex_lock(&bch_fs_list_lock); + list_del(&c->list); + mutex_unlock(&bch_fs_list_lock); + + closure_sync(&c->cl); + closure_debug_destroy(&c->cl); + + for (i = 0; i < c->sb.nr_devices; i++) { + struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true); + + if (ca) { + bch2_free_super(&ca->disk_sb); + bch2_dev_free(ca); + } + } + + bch_verbose(c, "shutdown complete"); + + kobject_put(&c->kobj); +} + +void bch2_fs_stop(struct bch_fs *c) +{ + __bch2_fs_stop(c); + bch2_fs_free(c); +} + +static int bch2_fs_online(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i; + int ret = 0; + + lockdep_assert_held(&bch_fs_list_lock); + + if (__bch2_uuid_to_fs(c->sb.uuid)) { + bch_err(c, "filesystem UUID already open"); + return -EINVAL; + } + + ret = bch2_fs_chardev_init(c); + if (ret) { + bch_err(c, "error creating character device"); + return ret; + } + + bch2_fs_debug_init(c); + + ret = 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") ?: + kobject_add(&c->counters_kobj, &c->kobj, "counters") ?: + bch2_opts_create_sysfs_files(&c->opts_dir); + if (ret) { + bch_err(c, "error creating sysfs objects"); + return ret; + } + + down_write(&c->state_lock); + + for_each_member_device(ca, c, i) { + ret = bch2_dev_sysfs_online(c, ca); + if (ret) { + bch_err(c, "error creating sysfs objects"); + percpu_ref_put(&ca->ref); + goto err; + } + } + + BUG_ON(!list_empty(&c->list)); + list_add(&c->list, &bch_fs_list); +err: + up_write(&c->state_lock); + return ret; +} + +static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts) +{ + struct bch_fs *c; + struct printbuf name = PRINTBUF; + unsigned i, iter_size; + int ret = 0; + + c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO); + if (!c) { + c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc); + goto out; + } + + __module_get(THIS_MODULE); + + closure_init(&c->cl, NULL); + + c->kobj.kset = bcachefs_kset; + kobject_init(&c->kobj, &bch2_fs_ktype); + kobject_init(&c->internal, &bch2_fs_internal_ktype); + kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype); + kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype); + kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype); + + c->minor = -1; + c->disk_sb.fs_sb = true; + + init_rwsem(&c->state_lock); + mutex_init(&c->sb_lock); + mutex_init(&c->replicas_gc_lock); + mutex_init(&c->btree_root_lock); + INIT_WORK(&c->read_only_work, bch2_fs_read_only_work); + + init_rwsem(&c->gc_lock); + mutex_init(&c->gc_gens_lock); + atomic_set(&c->journal_keys.ref, 1); + c->journal_keys.initial_ref_held = true; + + for (i = 0; i < BCH_TIME_STAT_NR; i++) + bch2_time_stats_init(&c->times[i]); + + bch2_fs_copygc_init(c); + bch2_fs_btree_key_cache_init_early(&c->btree_key_cache); + bch2_fs_btree_iter_init_early(c); + bch2_fs_btree_interior_update_init_early(c); + bch2_fs_allocator_background_init(c); + bch2_fs_allocator_foreground_init(c); + bch2_fs_rebalance_init(c); + bch2_fs_quota_init(c); + bch2_fs_ec_init_early(c); + bch2_fs_move_init(c); + bch2_fs_sb_errors_init_early(c); + + INIT_LIST_HEAD(&c->list); + + mutex_init(&c->usage_scratch_lock); + + mutex_init(&c->bio_bounce_pages_lock); + mutex_init(&c->snapshot_table_lock); + init_rwsem(&c->snapshot_create_lock); + + spin_lock_init(&c->btree_write_error_lock); + + INIT_WORK(&c->journal_seq_blacklist_gc_work, + bch2_blacklist_entries_gc); + + INIT_LIST_HEAD(&c->journal_iters); + + INIT_LIST_HEAD(&c->fsck_error_msgs); + mutex_init(&c->fsck_error_msgs_lock); + + seqcount_init(&c->gc_pos_lock); + + seqcount_init(&c->usage_lock); + + sema_init(&c->io_in_flight, 128); + + INIT_LIST_HEAD(&c->vfs_inodes_list); + mutex_init(&c->vfs_inodes_lock); + + c->copy_gc_enabled = 1; + c->rebalance.enabled = 1; + c->promote_whole_extents = true; + + c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write]; + c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write]; + c->journal.blocked_time = &c->times[BCH_TIME_blocked_journal]; + c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq]; + + bch2_fs_btree_cache_init_early(&c->btree_cache); + + mutex_init(&c->sectors_available_lock); + + ret = percpu_init_rwsem(&c->mark_lock); + if (ret) + goto err; + + mutex_lock(&c->sb_lock); + ret = bch2_sb_to_fs(c, sb); + mutex_unlock(&c->sb_lock); + + if (ret) + goto err; + + pr_uuid(&name, c->sb.user_uuid.b); + strscpy(c->name, name.buf, sizeof(c->name)); + printbuf_exit(&name); + + ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0; + if (ret) + goto err; + + /* Compat: */ + if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && + !BCH_SB_JOURNAL_FLUSH_DELAY(sb)) + SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); + + if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && + !BCH_SB_JOURNAL_RECLAIM_DELAY(sb)) + SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100); + + c->opts = bch2_opts_default; + ret = bch2_opts_from_sb(&c->opts, sb); + if (ret) + goto err; + + bch2_opts_apply(&c->opts, opts); + + c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc; + if (c->opts.inodes_use_key_cache) + c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes; + c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops; + + c->block_bits = ilog2(block_sectors(c)); + c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c); + + if (bch2_fs_init_fault("fs_alloc")) { + bch_err(c, "fs_alloc fault injected"); + ret = -EFAULT; + goto err; + } + + iter_size = sizeof(struct sort_iter) + + (btree_blocks(c) + 1) * 2 * + sizeof(struct sort_iter_set); + + c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus())); + + if (!(c->btree_update_wq = alloc_workqueue("bcachefs", + WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) || + !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io", + WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) || + !(c->copygc_wq = alloc_workqueue("bcachefs_copygc", + WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) || + !(c->io_complete_wq = alloc_workqueue("bcachefs_io", + WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) || + !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref", + WQ_FREEZABLE, 0)) || +#ifndef BCH_WRITE_REF_DEBUG + percpu_ref_init(&c->writes, bch2_writes_disabled, + PERCPU_REF_INIT_DEAD, GFP_KERNEL) || +#endif + mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) || + bioset_init(&c->btree_bio, 1, + max(offsetof(struct btree_read_bio, bio), + offsetof(struct btree_write_bio, wbio.bio)), + BIOSET_NEED_BVECS) || + !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) || + !(c->online_reserved = alloc_percpu(u64)) || + mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1, + btree_bytes(c)) || + mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) || + !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits, + sizeof(u64), GFP_KERNEL))) { + ret = -BCH_ERR_ENOMEM_fs_other_alloc; + goto err; + } + + ret = bch2_fs_counters_init(c) ?: + bch2_fs_sb_errors_init(c) ?: + bch2_io_clock_init(&c->io_clock[READ]) ?: + bch2_io_clock_init(&c->io_clock[WRITE]) ?: + bch2_fs_journal_init(&c->journal) ?: + bch2_fs_replicas_init(c) ?: + bch2_fs_btree_cache_init(c) ?: + bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?: + bch2_fs_btree_iter_init(c) ?: + bch2_fs_btree_interior_update_init(c) ?: + bch2_fs_buckets_waiting_for_journal_init(c) ?: + bch2_fs_btree_write_buffer_init(c) ?: + bch2_fs_subvolumes_init(c) ?: + bch2_fs_io_read_init(c) ?: + bch2_fs_io_write_init(c) ?: + bch2_fs_nocow_locking_init(c) ?: + bch2_fs_encryption_init(c) ?: + bch2_fs_compress_init(c) ?: + bch2_fs_ec_init(c) ?: + bch2_fs_fsio_init(c) ?: + bch2_fs_fs_io_buffered_init(c) ?: + bch2_fs_fs_io_direct_init(c); + if (ret) + goto err; + + for (i = 0; i < c->sb.nr_devices; i++) + if (bch2_dev_exists(c->disk_sb.sb, i) && + bch2_dev_alloc(c, i)) { + ret = -EEXIST; + goto err; + } + + bch2_journal_entry_res_resize(&c->journal, + &c->btree_root_journal_res, + BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX)); + bch2_dev_usage_journal_reserve(c); + bch2_journal_entry_res_resize(&c->journal, + &c->clock_journal_res, + (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2); + + mutex_lock(&bch_fs_list_lock); + ret = bch2_fs_online(c); + mutex_unlock(&bch_fs_list_lock); + + if (ret) + goto err; +out: + return c; +err: + bch2_fs_free(c); + c = ERR_PTR(ret); + goto out; +} + +noinline_for_stack +static void print_mount_opts(struct bch_fs *c) +{ + enum bch_opt_id i; + struct printbuf p = PRINTBUF; + bool first = true; + + prt_str(&p, "mounting version "); + bch2_version_to_text(&p, c->sb.version); + + if (c->opts.read_only) { + prt_str(&p, " opts="); + first = false; + prt_printf(&p, "ro"); + } + + for (i = 0; i < bch2_opts_nr; i++) { + const struct bch_option *opt = &bch2_opt_table[i]; + u64 v = bch2_opt_get_by_id(&c->opts, i); + + if (!(opt->flags & OPT_MOUNT)) + continue; + + if (v == bch2_opt_get_by_id(&bch2_opts_default, i)) + continue; + + prt_str(&p, first ? " opts=" : ","); + first = false; + bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE); + } + + bch_info(c, "%s", p.buf); + printbuf_exit(&p); +} + +int bch2_fs_start(struct bch_fs *c) +{ + struct bch_dev *ca; + time64_t now = ktime_get_real_seconds(); + unsigned i; + int ret; + + print_mount_opts(c); + + down_write(&c->state_lock); + + BUG_ON(test_bit(BCH_FS_STARTED, &c->flags)); + + mutex_lock(&c->sb_lock); + + ret = bch2_sb_members_v2_init(c); + if (ret) { + mutex_unlock(&c->sb_lock); + goto err; + } + + for_each_online_member(ca, c, i) + bch2_members_v2_get_mut(c->disk_sb.sb, i)->last_mount = cpu_to_le64(now); + + mutex_unlock(&c->sb_lock); + + for_each_rw_member(ca, c, i) + bch2_dev_allocator_add(c, ca); + bch2_recalc_capacity(c); + + ret = BCH_SB_INITIALIZED(c->disk_sb.sb) + ? bch2_fs_recovery(c) + : bch2_fs_initialize(c); + if (ret) + goto err; + + ret = bch2_opts_check_may_set(c); + if (ret) + goto err; + + if (bch2_fs_init_fault("fs_start")) { + bch_err(c, "fs_start fault injected"); + ret = -EINVAL; + goto err; + } + + set_bit(BCH_FS_STARTED, &c->flags); + + if (c->opts.read_only || c->opts.nochanges) { + bch2_fs_read_only(c); + } else { + ret = !test_bit(BCH_FS_RW, &c->flags) + ? bch2_fs_read_write(c) + : bch2_fs_read_write_late(c); + if (ret) + goto err; + } + + ret = 0; +out: + up_write(&c->state_lock); + return ret; +err: + bch_err_msg(c, ret, "starting filesystem"); + goto out; +} + +static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c) +{ + struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx); + + if (le16_to_cpu(sb->block_size) != block_sectors(c)) + return -BCH_ERR_mismatched_block_size; + + if (le16_to_cpu(m.bucket_size) < + BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb)) + return -BCH_ERR_bucket_size_too_small; + + return 0; +} + +static int bch2_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; + + if (!uuid_equal(&fs->uuid, &sb->uuid)) + return -BCH_ERR_device_not_a_member_of_filesystem; + + if (!bch2_dev_exists(newest, sb->dev_idx)) + return -BCH_ERR_device_has_been_removed; + + if (fs->block_size != sb->block_size) + return -BCH_ERR_mismatched_block_size; + + return 0; +} + +/* Device startup/shutdown: */ + +static void bch2_dev_release(struct kobject *kobj) +{ + struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj); + + kfree(ca); +} + +static void bch2_dev_free(struct bch_dev *ca) +{ + cancel_work_sync(&ca->io_error_work); + + if (ca->kobj.state_in_sysfs && + ca->disk_sb.bdev) + sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); + + if (ca->kobj.state_in_sysfs) + kobject_del(&ca->kobj); + + bch2_free_super(&ca->disk_sb); + bch2_dev_journal_exit(ca); + + free_percpu(ca->io_done); + bioset_exit(&ca->replica_set); + bch2_dev_buckets_free(ca); + free_page((unsigned long) ca->sb_read_scratch); + + bch2_time_stats_exit(&ca->io_latency[WRITE]); + bch2_time_stats_exit(&ca->io_latency[READ]); + + percpu_ref_exit(&ca->io_ref); + percpu_ref_exit(&ca->ref); + kobject_put(&ca->kobj); +} + +static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca) +{ + + lockdep_assert_held(&c->state_lock); + + if (percpu_ref_is_zero(&ca->io_ref)) + return; + + __bch2_dev_read_only(c, ca); + + reinit_completion(&ca->io_ref_completion); + percpu_ref_kill(&ca->io_ref); + wait_for_completion(&ca->io_ref_completion); + + if (ca->kobj.state_in_sysfs) { + sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); + sysfs_remove_link(&ca->kobj, "block"); + } + + bch2_free_super(&ca->disk_sb); + bch2_dev_journal_exit(ca); +} + +static void bch2_dev_ref_complete(struct percpu_ref *ref) +{ + struct bch_dev *ca = container_of(ref, struct bch_dev, ref); + + complete(&ca->ref_completion); +} + +static void bch2_dev_io_ref_complete(struct percpu_ref *ref) +{ + struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref); + + complete(&ca->io_ref_completion); +} + +static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca) +{ + int ret; + + if (!c->kobj.state_in_sysfs) + return 0; + + if (!ca->kobj.state_in_sysfs) { + ret = kobject_add(&ca->kobj, &c->kobj, + "dev-%u", ca->dev_idx); + if (ret) + return ret; + } + + if (ca->disk_sb.bdev) { + struct kobject *block = bdev_kobj(ca->disk_sb.bdev); + + ret = sysfs_create_link(block, &ca->kobj, "bcachefs"); + if (ret) + return ret; + + ret = sysfs_create_link(&ca->kobj, block, "block"); + if (ret) + return ret; + } + + return 0; +} + +static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c, + struct bch_member *member) +{ + struct bch_dev *ca; + unsigned i; + + ca = kzalloc(sizeof(*ca), GFP_KERNEL); + if (!ca) + return NULL; + + kobject_init(&ca->kobj, &bch2_dev_ktype); + init_completion(&ca->ref_completion); + init_completion(&ca->io_ref_completion); + + init_rwsem(&ca->bucket_lock); + + INIT_WORK(&ca->io_error_work, bch2_io_error_work); + + bch2_time_stats_init(&ca->io_latency[READ]); + bch2_time_stats_init(&ca->io_latency[WRITE]); + + ca->mi = bch2_mi_to_cpu(member); + + for (i = 0; i < ARRAY_SIZE(member->errors); i++) + atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i])); + + ca->uuid = member->uuid; + + ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE, + ca->mi.bucket_size / btree_sectors(c)); + + if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, + 0, GFP_KERNEL) || + percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete, + PERCPU_REF_INIT_DEAD, GFP_KERNEL) || + !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) || + bch2_dev_buckets_alloc(c, ca) || + bioset_init(&ca->replica_set, 4, + offsetof(struct bch_write_bio, bio), 0) || + !(ca->io_done = alloc_percpu(*ca->io_done))) + goto err; + + return ca; +err: + bch2_dev_free(ca); + return NULL; +} + +static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca, + unsigned dev_idx) +{ + ca->dev_idx = dev_idx; + __set_bit(ca->dev_idx, ca->self.d); + scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx); + + ca->fs = c; + rcu_assign_pointer(c->devs[ca->dev_idx], ca); + + if (bch2_dev_sysfs_online(c, ca)) + pr_warn("error creating sysfs objects"); +} + +static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx) +{ + struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx); + struct bch_dev *ca = NULL; + int ret = 0; + + if (bch2_fs_init_fault("dev_alloc")) + goto err; + + ca = __bch2_dev_alloc(c, &member); + if (!ca) + goto err; + + ca->fs = c; + + bch2_dev_attach(c, ca, dev_idx); + return ret; +err: + if (ca) + bch2_dev_free(ca); + return -BCH_ERR_ENOMEM_dev_alloc; +} + +static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb) +{ + unsigned ret; + + if (bch2_dev_is_online(ca)) { + bch_err(ca, "already have device online in slot %u", + sb->sb->dev_idx); + return -BCH_ERR_device_already_online; + } + + if (get_capacity(sb->bdev->bd_disk) < + ca->mi.bucket_size * ca->mi.nbuckets) { + bch_err(ca, "cannot online: device too small"); + return -BCH_ERR_device_size_too_small; + } + + BUG_ON(!percpu_ref_is_zero(&ca->io_ref)); + + ret = bch2_dev_journal_init(ca, sb->sb); + if (ret) + return ret; + + /* Commit: */ + ca->disk_sb = *sb; + memset(sb, 0, sizeof(*sb)); + + ca->dev = ca->disk_sb.bdev->bd_dev; + + percpu_ref_reinit(&ca->io_ref); + + return 0; +} + +static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb) +{ + struct bch_dev *ca; + int ret; + + lockdep_assert_held(&c->state_lock); + + if (le64_to_cpu(sb->sb->seq) > + le64_to_cpu(c->disk_sb.sb->seq)) + bch2_sb_to_fs(c, sb->sb); + + BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices || + !c->devs[sb->sb->dev_idx]); + + ca = bch_dev_locked(c, sb->sb->dev_idx); + + ret = __bch2_dev_attach_bdev(ca, sb); + if (ret) + return ret; + + bch2_dev_sysfs_online(c, ca); + + if (c->sb.nr_devices == 1) + snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev); + snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev); + + rebalance_wakeup(c); + return 0; +} + +/* Device management: */ + +/* + * Note: this function is also used by the error paths - when a particular + * device sees an error, we call it to determine whether we can just set the + * device RO, or - if this function returns false - we'll set the whole + * filesystem RO: + * + * XXX: maybe we should be more explicit about whether we're changing state + * because we got an error or what have you? + */ +bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca, + enum bch_member_state new_state, int flags) +{ + struct bch_devs_mask new_online_devs; + struct bch_dev *ca2; + int i, nr_rw = 0, required; + + lockdep_assert_held(&c->state_lock); + + switch (new_state) { + case BCH_MEMBER_STATE_rw: + return true; + case BCH_MEMBER_STATE_ro: + if (ca->mi.state != BCH_MEMBER_STATE_rw) + return true; + + /* do we have enough devices to write to? */ + for_each_member_device(ca2, c, i) + if (ca2 != ca) + nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw; + + required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED) + ? c->opts.metadata_replicas + : c->opts.metadata_replicas_required, + !(flags & BCH_FORCE_IF_DATA_DEGRADED) + ? c->opts.data_replicas + : c->opts.data_replicas_required); + + return nr_rw >= required; + case BCH_MEMBER_STATE_failed: + case BCH_MEMBER_STATE_spare: + if (ca->mi.state != BCH_MEMBER_STATE_rw && + ca->mi.state != BCH_MEMBER_STATE_ro) + return true; + + /* do we have enough devices to read from? */ + new_online_devs = bch2_online_devs(c); + __clear_bit(ca->dev_idx, new_online_devs.d); + + return bch2_have_enough_devs(c, new_online_devs, flags, false); + default: + BUG(); + } +} + +static bool bch2_fs_may_start(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i, flags = 0; + + if (c->opts.very_degraded) + flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST; + + if (c->opts.degraded) + flags |= BCH_FORCE_IF_DEGRADED; + + if (!c->opts.degraded && + !c->opts.very_degraded) { + mutex_lock(&c->sb_lock); + + for (i = 0; i < c->disk_sb.sb->nr_devices; i++) { + if (!bch2_dev_exists(c->disk_sb.sb, i)) + continue; + + ca = bch_dev_locked(c, i); + + if (!bch2_dev_is_online(ca) && + (ca->mi.state == BCH_MEMBER_STATE_rw || + ca->mi.state == BCH_MEMBER_STATE_ro)) { + mutex_unlock(&c->sb_lock); + return false; + } + } + mutex_unlock(&c->sb_lock); + } + + return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true); +} + +static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca) +{ + /* + * The allocator thread itself allocates btree nodes, so stop it first: + */ + bch2_dev_allocator_remove(c, ca); + bch2_dev_journal_stop(&c->journal, ca); +} + +static void __bch2_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); + + bch2_dev_allocator_add(c, ca); + bch2_recalc_capacity(c); +} + +int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, + enum bch_member_state new_state, int flags) +{ + struct bch_member *m; + int ret = 0; + + if (ca->mi.state == new_state) + return 0; + + if (!bch2_dev_state_allowed(c, ca, new_state, flags)) + return -BCH_ERR_device_state_not_allowed; + + if (new_state != BCH_MEMBER_STATE_rw) + __bch2_dev_read_only(c, ca); + + bch_notice(ca, "%s", bch2_member_states[new_state]); + + mutex_lock(&c->sb_lock); + m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); + SET_BCH_MEMBER_STATE(m, new_state); + bch2_write_super(c); + mutex_unlock(&c->sb_lock); + + if (new_state == BCH_MEMBER_STATE_rw) + __bch2_dev_read_write(c, ca); + + rebalance_wakeup(c); + + return ret; +} + +int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, + enum bch_member_state new_state, int flags) +{ + int ret; + + down_write(&c->state_lock); + ret = __bch2_dev_set_state(c, ca, new_state, flags); + up_write(&c->state_lock); + + return ret; +} + +/* Device add/removal: */ + +static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca) +{ + struct bpos start = POS(ca->dev_idx, 0); + struct bpos end = POS(ca->dev_idx, U64_MAX); + int ret; + + /* + * We clear the LRU and need_discard btrees first so that we don't race + * with bch2_do_invalidates() and bch2_do_discards() + */ + ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end, + BTREE_TRIGGER_NORUN, NULL) ?: + bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end, + BTREE_TRIGGER_NORUN, NULL) ?: + bch2_btree_delete_range(c, BTREE_ID_freespace, start, end, + BTREE_TRIGGER_NORUN, NULL) ?: + bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end, + BTREE_TRIGGER_NORUN, NULL) ?: + bch2_btree_delete_range(c, BTREE_ID_alloc, start, end, + BTREE_TRIGGER_NORUN, NULL) ?: + bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end, + BTREE_TRIGGER_NORUN, NULL); + if (ret) + bch_err_msg(c, ret, "removing dev alloc info"); + + return ret; +} + +int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags) +{ + struct bch_member *m; + unsigned dev_idx = ca->dev_idx, data; + int ret; + + down_write(&c->state_lock); + + /* + * We consume a reference to ca->ref, regardless of whether we succeed + * or fail: + */ + percpu_ref_put(&ca->ref); + + if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { + bch_err(ca, "Cannot remove without losing data"); + ret = -BCH_ERR_device_state_not_allowed; + goto err; + } + + __bch2_dev_read_only(c, ca); + + ret = bch2_dev_data_drop(c, ca->dev_idx, flags); + if (ret) { + bch_err_msg(ca, ret, "dropping data"); + goto err; + } + + ret = bch2_dev_remove_alloc(c, ca); + if (ret) { + bch_err_msg(ca, ret, "deleting alloc info"); + goto err; + } + + ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx); + if (ret) { + bch_err_msg(ca, ret, "flushing journal"); + goto err; + } + + ret = bch2_journal_flush(&c->journal); + if (ret) { + bch_err(ca, "journal error"); + goto err; + } + + ret = bch2_replicas_gc2(c); + if (ret) { + bch_err_msg(ca, ret, "in replicas_gc2()"); + goto err; + } + + data = bch2_dev_has_data(c, ca); + if (data) { + struct printbuf data_has = PRINTBUF; + + prt_bitflags(&data_has, bch2_data_types, data); + bch_err(ca, "Remove failed, still has data (%s)", data_has.buf); + printbuf_exit(&data_has); + ret = -EBUSY; + goto err; + } + + __bch2_dev_offline(c, ca); + + mutex_lock(&c->sb_lock); + rcu_assign_pointer(c->devs[ca->dev_idx], NULL); + mutex_unlock(&c->sb_lock); + + percpu_ref_kill(&ca->ref); + wait_for_completion(&ca->ref_completion); + + bch2_dev_free(ca); + + /* + * At this point the device object has been removed in-core, but the + * on-disk journal might still refer to the device index via sb device + * usage entries. Recovery fails if it sees usage information for an + * invalid device. Flush journal pins to push the back of the journal + * past now invalid device index references before we update the + * superblock, but after the device object has been removed so any + * further journal writes elide usage info for the device. + */ + bch2_journal_flush_all_pins(&c->journal); + + /* + * Free this device's slot in the bch_member array - all pointers to + * this device must be gone: + */ + mutex_lock(&c->sb_lock); + m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); + memset(&m->uuid, 0, sizeof(m->uuid)); + + bch2_write_super(c); + + mutex_unlock(&c->sb_lock); + up_write(&c->state_lock); + + bch2_dev_usage_journal_reserve(c); + return 0; +err: + if (ca->mi.state == BCH_MEMBER_STATE_rw && + !percpu_ref_is_zero(&ca->io_ref)) + __bch2_dev_read_write(c, ca); + up_write(&c->state_lock); + return ret; +} + +/* Add new device to running filesystem: */ +int bch2_dev_add(struct bch_fs *c, const char *path) +{ + struct bch_opts opts = bch2_opts_empty(); + struct bch_sb_handle sb; + struct bch_dev *ca = NULL; + struct bch_sb_field_members_v2 *mi; + struct bch_member dev_mi; + unsigned dev_idx, nr_devices, u64s; + struct printbuf errbuf = PRINTBUF; + struct printbuf label = PRINTBUF; + int ret; + + ret = bch2_read_super(path, &opts, &sb); + if (ret) { + bch_err_msg(c, ret, "reading super"); + goto err; + } + + dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx); + + if (BCH_MEMBER_GROUP(&dev_mi)) { + bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1); + if (label.allocation_failure) { + ret = -ENOMEM; + goto err; + } + } + + ret = bch2_dev_may_add(sb.sb, c); + if (ret) { + bch_err_fn(c, ret); + goto err; + } + + ca = __bch2_dev_alloc(c, &dev_mi); + if (!ca) { + ret = -ENOMEM; + goto err; + } + + bch2_dev_usage_init(ca); + + ret = __bch2_dev_attach_bdev(ca, &sb); + if (ret) + goto err; + + ret = bch2_dev_journal_alloc(ca); + if (ret) { + bch_err_msg(c, ret, "allocating journal"); + goto err; + } + + down_write(&c->state_lock); + mutex_lock(&c->sb_lock); + + ret = bch2_sb_from_fs(c, ca); + if (ret) { + bch_err_msg(c, ret, "setting up new superblock"); + goto err_unlock; + } + + if (dynamic_fault("bcachefs:add:no_slot")) + goto no_slot; + + for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) + if (!bch2_dev_exists(c->disk_sb.sb, dev_idx)) + goto have_slot; +no_slot: + ret = -BCH_ERR_ENOSPC_sb_members; + bch_err_msg(c, ret, "setting up new superblock"); + goto err_unlock; + +have_slot: + nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices); + + mi = bch2_sb_field_get(c->disk_sb.sb, members_v2); + u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) + + le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64)); + + mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s); + if (!mi) { + ret = -BCH_ERR_ENOSPC_sb_members; + bch_err_msg(c, ret, "setting up new superblock"); + goto err_unlock; + } + struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); + + /* success: */ + + *m = dev_mi; + m->last_mount = cpu_to_le64(ktime_get_real_seconds()); + c->disk_sb.sb->nr_devices = nr_devices; + + ca->disk_sb.sb->dev_idx = dev_idx; + bch2_dev_attach(c, ca, dev_idx); + + if (BCH_MEMBER_GROUP(&dev_mi)) { + ret = __bch2_dev_group_set(c, ca, label.buf); + if (ret) { + bch_err_msg(c, ret, "creating new label"); + goto err_unlock; + } + } + + bch2_write_super(c); + mutex_unlock(&c->sb_lock); + + bch2_dev_usage_journal_reserve(c); + + ret = bch2_trans_mark_dev_sb(c, ca); + if (ret) { + bch_err_msg(ca, ret, "marking new superblock"); + goto err_late; + } + + ret = bch2_fs_freespace_init(c); + if (ret) { + bch_err_msg(ca, ret, "initializing free space"); + goto err_late; + } + + ca->new_fs_bucket_idx = 0; + + if (ca->mi.state == BCH_MEMBER_STATE_rw) + __bch2_dev_read_write(c, ca); + + up_write(&c->state_lock); + return 0; + +err_unlock: + mutex_unlock(&c->sb_lock); + up_write(&c->state_lock); +err: + if (ca) + bch2_dev_free(ca); + bch2_free_super(&sb); + printbuf_exit(&label); + printbuf_exit(&errbuf); + return ret; +err_late: + up_write(&c->state_lock); + ca = NULL; + goto err; +} + +/* Hot add existing device to running filesystem: */ +int bch2_dev_online(struct bch_fs *c, const char *path) +{ + struct bch_opts opts = bch2_opts_empty(); + struct bch_sb_handle sb = { NULL }; + struct bch_dev *ca; + unsigned dev_idx; + int ret; + + down_write(&c->state_lock); + + ret = bch2_read_super(path, &opts, &sb); + if (ret) { + up_write(&c->state_lock); + return ret; + } + + dev_idx = sb.sb->dev_idx; + + ret = bch2_dev_in_fs(c->disk_sb.sb, sb.sb); + if (ret) { + bch_err_msg(c, ret, "bringing %s online", path); + goto err; + } + + ret = bch2_dev_attach_bdev(c, &sb); + if (ret) + goto err; + + ca = bch_dev_locked(c, dev_idx); + + ret = bch2_trans_mark_dev_sb(c, ca); + if (ret) { + bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path); + goto err; + } + + if (ca->mi.state == BCH_MEMBER_STATE_rw) + __bch2_dev_read_write(c, ca); + + if (!ca->mi.freespace_initialized) { + ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets); + bch_err_msg(ca, ret, "initializing free space"); + if (ret) + goto err; + } + + if (!ca->journal.nr) { + ret = bch2_dev_journal_alloc(ca); + bch_err_msg(ca, ret, "allocating journal"); + if (ret) + goto err; + } + + mutex_lock(&c->sb_lock); + bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = + cpu_to_le64(ktime_get_real_seconds()); + bch2_write_super(c); + mutex_unlock(&c->sb_lock); + + up_write(&c->state_lock); + return 0; +err: + up_write(&c->state_lock); + bch2_free_super(&sb); + return ret; +} + +int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags) +{ + down_write(&c->state_lock); + + if (!bch2_dev_is_online(ca)) { + bch_err(ca, "Already offline"); + up_write(&c->state_lock); + return 0; + } + + if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { + bch_err(ca, "Cannot offline required disk"); + up_write(&c->state_lock); + return -BCH_ERR_device_state_not_allowed; + } + + __bch2_dev_offline(c, ca); + + up_write(&c->state_lock); + return 0; +} + +int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets) +{ + struct bch_member *m; + u64 old_nbuckets; + int ret = 0; + + down_write(&c->state_lock); + old_nbuckets = ca->mi.nbuckets; + + if (nbuckets < ca->mi.nbuckets) { + bch_err(ca, "Cannot shrink yet"); + ret = -EINVAL; + goto err; + } + + if (bch2_dev_is_online(ca) && + get_capacity(ca->disk_sb.bdev->bd_disk) < + ca->mi.bucket_size * nbuckets) { + bch_err(ca, "New size larger than device"); + ret = -BCH_ERR_device_size_too_small; + goto err; + } + + ret = bch2_dev_buckets_resize(c, ca, nbuckets); + if (ret) { + bch_err_msg(ca, ret, "resizing buckets"); + goto err; + } + + ret = bch2_trans_mark_dev_sb(c, ca); + if (ret) + goto err; + + mutex_lock(&c->sb_lock); + m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); + m->nbuckets = cpu_to_le64(nbuckets); + + bch2_write_super(c); + mutex_unlock(&c->sb_lock); + + if (ca->mi.freespace_initialized) { + ret = bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets); + if (ret) + goto err; + + /* + * XXX: this is all wrong transactionally - we'll be able to do + * this correctly after the disk space accounting rewrite + */ + ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets; + } + + bch2_recalc_capacity(c); +err: + up_write(&c->state_lock); + return ret; +} + +/* return with ref on ca->ref: */ +struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name) +{ + struct bch_dev *ca; + unsigned i; + + rcu_read_lock(); + for_each_member_device_rcu(ca, c, i, NULL) + if (!strcmp(name, ca->name)) + goto found; + ca = ERR_PTR(-BCH_ERR_ENOENT_dev_not_found); +found: + rcu_read_unlock(); + + return ca; +} + +/* Filesystem open: */ + +struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices, + struct bch_opts opts) +{ + DARRAY(struct bch_sb_handle) sbs = { 0 }; + struct bch_fs *c = NULL; + struct bch_sb_handle *sb, *best = NULL; + struct printbuf errbuf = PRINTBUF; + int ret = 0; + + if (!try_module_get(THIS_MODULE)) + return ERR_PTR(-ENODEV); + + if (!nr_devices) { + ret = -EINVAL; + goto err; + } + + ret = darray_make_room(&sbs, nr_devices); + if (ret) + goto err; + + for (unsigned i = 0; i < nr_devices; i++) { + struct bch_sb_handle sb = { NULL }; + + ret = bch2_read_super(devices[i], &opts, &sb); + if (ret) + goto err; + + BUG_ON(darray_push(&sbs, sb)); + } + + darray_for_each(sbs, sb) + if (!best || le64_to_cpu(sb->sb->seq) > le64_to_cpu(best->sb->seq)) + best = sb; + + darray_for_each_reverse(sbs, sb) { + if (sb != best && !bch2_dev_exists(best->sb, sb->sb->dev_idx)) { + pr_info("%pg has been removed, skipping", sb->bdev); + bch2_free_super(sb); + darray_remove_item(&sbs, sb); + best -= best > sb; + continue; + } + + ret = bch2_dev_in_fs(best->sb, sb->sb); + if (ret) + goto err_print; + } + + c = bch2_fs_alloc(best->sb, opts); + ret = PTR_ERR_OR_ZERO(c); + if (ret) + goto err; + + down_write(&c->state_lock); + darray_for_each(sbs, sb) { + ret = bch2_dev_attach_bdev(c, sb); + if (ret) { + up_write(&c->state_lock); + goto err; + } + } + up_write(&c->state_lock); + + if (!bch2_fs_may_start(c)) { + ret = -BCH_ERR_insufficient_devices_to_start; + goto err_print; + } + + if (!c->opts.nostart) { + ret = bch2_fs_start(c); + if (ret) + goto err; + } +out: + darray_for_each(sbs, sb) + bch2_free_super(sb); + darray_exit(&sbs); + printbuf_exit(&errbuf); + module_put(THIS_MODULE); + return c; +err_print: + pr_err("bch_fs_open err opening %s: %s", + devices[0], bch2_err_str(ret)); +err: + if (!IS_ERR_OR_NULL(c)) + bch2_fs_stop(c); + c = ERR_PTR(ret); + goto out; +} + +/* Global interfaces/init */ + +static void bcachefs_exit(void) +{ + bch2_debug_exit(); + bch2_vfs_exit(); + bch2_chardev_exit(); + bch2_btree_key_cache_exit(); + if (bcachefs_kset) + kset_unregister(bcachefs_kset); +} + +static int __init bcachefs_init(void) +{ + bch2_bkey_pack_test(); + + if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) || + bch2_btree_key_cache_init() || + bch2_chardev_init() || + bch2_vfs_init() || + bch2_debug_init()) + goto err; + + return 0; +err: + bcachefs_exit(); + return -ENOMEM; +} + +#define BCH_DEBUG_PARAM(name, description) \ + bool bch2_##name; \ + module_param_named(name, bch2_##name, bool, 0644); \ + MODULE_PARM_DESC(name, description); +BCH_DEBUG_PARAMS() +#undef BCH_DEBUG_PARAM + +__maybe_unused +static unsigned bch2_metadata_version = bcachefs_metadata_version_current; +module_param_named(version, bch2_metadata_version, uint, 0400); + +module_exit(bcachefs_exit); +module_init(bcachefs_init); |