// 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 * 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_key_cache.h" #include "btree_update_interior.h" #include "btree_io.h" #include "buckets_waiting_for_journal.h" #include "chardev.h" #include "checksum.h" #include "clock.h" #include "compress.h" #include "debug.h" #include "disk_groups.h" #include "ec.h" #include "error.h" #include "fs.h" #include "fs-io.h" #include "fsck.h" #include "inode.h" #include "io.h" #include "journal.h" #include "journal_reclaim.h" #include "journal_seq_blacklist.h" #include "move.h" #include "migrate.h" #include "movinggc.h" #include "quota.h" #include "rebalance.h" #include "recovery.h" #include "replicas.h" #include "subvolume.h" #include "super.h" #include "super-io.h" #include "sysfs.h" #include "counters.h" #include #include #include #include #include #include #include #include #include #include #include #include MODULE_LICENSE("GPL"); MODULE_AUTHOR("Kent Overstreet "); #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); static DECLARE_WAIT_QUEUE_HEAD(bch_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_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.sb->uuid, &uuid, sizeof(uuid_le))) return c; return NULL; } struct bch_fs *bch2_uuid_to_fs(uuid_le 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_rebalance_stop(c); bch2_copygc_stop(c); bch2_gc_thread_stop(c); bch_verbose(c, "flushing journal and stopping allocators"); 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"); 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); } 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(&bch_read_only_wait); } 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: */ percpu_ref_kill(&c->writes); cancel_work_sync(&c->ec_stripe_delete_work); /* * 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)); __bch2_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 (!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) { 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(&bch_read_only_wait); return ret; } static int bch2_fs_read_write_late(struct bch_fs *c) { int ret; ret = bch2_gc_thread_start(c); if (ret) { bch_err(c, "error starting gc thread"); return ret; } 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; } schedule_work(&c->ec_stripe_delete_work); 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 -EROFS; } if (test_bit(BCH_FS_RW, &c->flags)) return 0; /* * nochanges is used for fsck -n mode - we have to allow going rw * during recovery for that to work: */ if (c->opts.norecovery || (c->opts.nochanges && (!early || c->opts.read_only))) return -EROFS; bch_info(c, "going read-write"); ret = bch2_fs_mark_dirty(c); if (ret) goto err; clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags); for_each_rw_member(ca, c, i) bch2_dev_allocator_add(c, ca); bch2_recalc_capacity(c); bch2_do_discards(c); if (!early) { ret = bch2_fs_read_write_late(c); if (ret) goto err; } percpu_ref_reinit(&c->writes); set_bit(BCH_FS_RW, &c->flags); set_bit(BCH_FS_WAS_RW, &c->flags); return 0; err: __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; int cpu; for (i = 0; i < BCH_TIME_STAT_NR; i++) bch2_time_stats_exit(&c->times[i]); bch2_fs_counters_exit(c); bch2_fs_snapshots_exit(c); bch2_fs_quota_exit(c); bch2_fs_fsio_exit(c); bch2_fs_ec_exit(c); bch2_fs_encryption_exit(c); bch2_fs_io_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_free(&c->journal_keys); bch2_journal_entries_free(c); percpu_free_rwsem(&c->mark_lock); if (c->btree_paths_bufs) for_each_possible_cpu(cpu) kfree(per_cpu_ptr(c->btree_paths_bufs, cpu)->path); free_percpu(c->online_reserved); free_percpu(c->btree_paths_bufs); 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); percpu_ref_exit(&c->writes); kfree(rcu_dereference_protected(c->disk_groups, 1)); kfree(c->journal_seq_blacklist_table); kfree(c->unused_inode_hints); free_heap(&c->copygc_heap); 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); for (i = 0; i < c->sb.nr_devices; i++) if (c->devs[i]) bch2_free_super(&c->devs[i]->disk_sb); } 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++) if (c->devs[i]) bch2_dev_free(rcu_dereference_protected(c->devs[i], 1)); 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_sb_field_members *mi; struct bch_fs *c; struct printbuf name = PRINTBUF; unsigned i, iter_size; int ret = 0; pr_verbose_init(opts, ""); c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO); if (!c) { c = ERR_PTR(-ENOMEM); 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); 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_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); INIT_LIST_HEAD(&c->list); mutex_init(&c->usage_scratch_lock); mutex_init(&c->bio_bounce_pages_lock); mutex_init(&c->snapshot_table_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_errors); mutex_init(&c->fsck_error_lock); INIT_LIST_HEAD(&c->ec_stripe_head_list); mutex_init(&c->ec_stripe_head_lock); INIT_LIST_HEAD(&c->ec_stripe_new_list); mutex_init(&c->ec_stripe_new_lock); INIT_LIST_HEAD(&c->data_progress_list); mutex_init(&c->data_progress_lock); spin_lock_init(&c->ec_stripes_heap_lock); seqcount_init(&c->gc_pos_lock); seqcount_init(&c->usage_lock); sema_init(&c->io_in_flight, 64); 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); strlcpy(c->name, name.buf, sizeof(c->name)); printbuf_exit(&name); ret = name.allocation_failure ? -ENOMEM : 0; if (ret) goto err; /* Compat: */ if (sb->version <= bcachefs_metadata_version_inode_v2 && !BCH_SB_JOURNAL_FLUSH_DELAY(sb)) SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); if (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); /* key cache currently disabled for inodes, because of snapshots: */ c->opts.inodes_use_key_cache = 0; 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->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_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) || !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io", WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 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)) || percpu_ref_init(&c->writes, bch2_writes_disabled, PERCPU_REF_INIT_DEAD, GFP_KERNEL) || 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->btree_paths_bufs = alloc_percpu(struct btree_path_buf)) || !(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 = -ENOMEM; goto err; } ret = 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_subvolumes_init(c) ?: bch2_fs_io_init(c) ?: bch2_fs_encryption_init(c) ?: bch2_fs_compress_init(c) ?: bch2_fs_ec_init(c) ?: bch2_fs_fsio_init(c) ?: bch2_fs_counters_init(c); if (ret) goto err; mi = bch2_sb_get_members(c->disk_sb.sb); for (i = 0; i < c->sb.nr_devices; i++) if (bch2_dev_exists(c->disk_sb.sb, mi, 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: pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c)); 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; if (c->opts.read_only) { prt_printf(&p, "ro"); first = false; } 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; if (!first) prt_printf(&p, ","); first = false; bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE); } if (!p.pos) prt_printf(&p, "(null)"); bch_info(c, "mounted version=%s opts=%s", bch2_metadata_versions[c->sb.version], p.buf); printbuf_exit(&p); } int bch2_fs_start(struct bch_fs *c) { struct bch_sb_field_members *mi; struct bch_dev *ca; time64_t now = ktime_get_real_seconds(); unsigned i; int ret = -EINVAL; down_write(&c->state_lock); BUG_ON(test_bit(BCH_FS_STARTED, &c->flags)); mutex_lock(&c->sb_lock); for_each_online_member(ca, c, i) bch2_sb_from_fs(c, ca); mi = bch2_sb_get_members(c->disk_sb.sb); for_each_online_member(ca, c, i) mi->members[ca->dev_idx].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; ret = -EINVAL; if (bch2_fs_init_fault("fs_start")) { bch_err(c, "fs_start fault injected"); 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; } print_mount_opts(c); ret = 0; out: up_write(&c->state_lock); return ret; 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\n"); 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\n"); break; case BCH_FSCK_REPAIR_IMPOSSIBLE: bch_err(c, "filesystem contains errors, but repair impossible"); break; case BCH_FSCK_UNKNOWN_VERSION: bch_err(c, "unknown metadata version"); break; case -ENOMEM: bch_err(c, "cannot allocate memory"); break; case -EIO: bch_err(c, "IO error"); break; } if (ret >= 0) ret = -EIO; goto out; } static const char *bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c) { struct bch_sb_field_members *sb_mi; sb_mi = bch2_sb_get_members(sb); if (!sb_mi) return "Invalid superblock: member info area missing"; if (le16_to_cpu(sb->block_size) != block_sectors(c)) return "mismatched block size"; if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) < BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb)) return "new cache bucket size is too small"; return NULL; } static const char *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; struct bch_sb_field_members *mi = bch2_sb_get_members(newest); if (uuid_le_cmp(fs->uuid, sb->uuid)) return "device not a member of filesystem"; if (!bch2_dev_exists(newest, mi, sb->dev_idx)) return "device has been removed"; if (fs->block_size != sb->block_size) return "mismatched block size"; return NULL; } /* 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; 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); 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_get_members(c->disk_sb.sb)->members + dev_idx; struct bch_dev *ca = NULL; int ret = 0; pr_verbose_init(c->opts, ""); 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); out: pr_verbose_init(c->opts, "ret %i", ret); return ret; err: if (ca) bch2_dev_free(ca); ret = -ENOMEM; goto out; } 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 -EINVAL; } if (get_capacity(sb->bdev->bd_disk) < ca->mi.bucket_size * ca->mi.nbuckets) { bch_err(ca, "cannot online: device too small"); return -EINVAL; } BUG_ON(!percpu_ref_is_zero(&ca->io_ref)); if (get_capacity(sb->bdev->bd_disk) < ca->mi.bucket_size * ca->mi.nbuckets) { bch_err(ca, "device too small"); return -EINVAL; } ret = bch2_dev_journal_init(ca, sb->sb); if (ret) return ret; /* Commit: */ ca->disk_sb = *sb; if (sb->mode & FMODE_EXCL) ca->disk_sb.bdev->bd_holder = ca; 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) bdevname(ca->disk_sb.bdev, c->name); bdevname(ca->disk_sb.bdev, ca->name); 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_sb_field_members *mi; 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); mi = bch2_sb_get_members(c->disk_sb.sb); for (i = 0; i < c->disk_sb.sb->nr_devices; i++) { if (!bch2_dev_exists(c->disk_sb.sb, mi, 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) { /* * Device going read only means the copygc reserve get smaller, so we * don't want that happening while copygc is in progress: */ bch2_copygc_stop(c); /* * The allocator thread itself allocates btree nodes, so stop it first: */ bch2_dev_allocator_remove(c, ca); bch2_dev_journal_stop(&c->journal, ca); bch2_copygc_start(c); } 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_sb_field_members *mi; int ret = 0; if (ca->mi.state == new_state) return 0; if (!bch2_dev_state_allowed(c, ca, new_state, flags)) return -EINVAL; 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); mi = bch2_sb_get_members(c->disk_sb.sb); SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], 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_alloc, start, end, BTREE_TRIGGER_NORUN, NULL); if (ret) bch_err(c, "error %i removing dev alloc info", ret); return ret; } int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags) { struct bch_sb_field_members *mi; unsigned dev_idx = ca->dev_idx, data; int ret = -EINVAL; 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"); goto err; } __bch2_dev_read_only(c, ca); ret = bch2_dev_data_drop(c, ca->dev_idx, flags); if (ret) { bch_err(ca, "Remove failed: error %i dropping data", ret); goto err; } ret = bch2_dev_remove_alloc(c, ca); if (ret) { bch_err(ca, "Remove failed, error deleting alloc info"); goto err; } ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx); if (ret) { bch_err(ca, "Remove failed: error %i flushing journal", ret); goto err; } ret = bch2_journal_flush(&c->journal); if (ret) { bch_err(ca, "Remove failed, journal error"); goto err; } ret = bch2_replicas_gc2(c); if (ret) { bch_err(ca, "Remove failed: error %i from replicas gc", ret); 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); /* * Free this device's slot in the bch_member array - all pointers to * this device must be gone: */ mutex_lock(&c->sb_lock); mi = bch2_sb_get_members(c->disk_sb.sb); memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].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; const char *err; struct bch_dev *ca = NULL; struct bch_sb_field_members *mi; struct bch_member dev_mi; unsigned dev_idx, nr_devices, u64s; struct printbuf errbuf = PRINTBUF; int ret; ret = bch2_read_super(path, &opts, &sb); if (ret) { bch_err(c, "device add error: error reading super: %i", ret); goto err; } dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx]; err = bch2_dev_may_add(sb.sb, c); if (err) { bch_err(c, "device add error: %s", err); ret = -EINVAL; goto err; } ca = __bch2_dev_alloc(c, &dev_mi); if (!ca) { bch2_free_super(&sb); ret = -ENOMEM; goto err; } bch2_dev_usage_init(ca); ret = __bch2_dev_attach_bdev(ca, &sb); if (ret) { bch2_dev_free(ca); goto err; } ret = bch2_dev_journal_alloc(ca); if (ret) { bch_err(c, "device add error: journal alloc failed"); goto err; } down_write(&c->state_lock); mutex_lock(&c->sb_lock); ret = bch2_sb_from_fs(c, ca); if (ret) { bch_err(c, "device add error: new device superblock too small"); goto err_unlock; } mi = bch2_sb_get_members(ca->disk_sb.sb); if (!bch2_sb_resize_members(&ca->disk_sb, le32_to_cpu(mi->field.u64s) + sizeof(dev_mi) / sizeof(u64))) { bch_err(c, "device add error: new device superblock too small"); ret = -ENOSPC; goto err_unlock; } if (dynamic_fault("bcachefs:add:no_slot")) goto no_slot; mi = bch2_sb_get_members(c->disk_sb.sb); for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) if (!bch2_dev_exists(c->disk_sb.sb, mi, dev_idx)) goto have_slot; no_slot: bch_err(c, "device add error: already have maximum number of devices"); 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); mi = bch2_sb_resize_members(&c->disk_sb, u64s); if (!mi) { bch_err(c, "device add error: no room in superblock for member info"); ret = -ENOSPC; goto err_unlock; } /* success: */ mi->members[dev_idx] = dev_mi; mi->members[dev_idx].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); 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(c, "device add error: error marking new superblock: %i", ret); goto err_late; } ret = bch2_fs_freespace_init(c); if (ret) { bch_err(c, "device add error: error initializing free space: %i", ret); 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(&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_sb_field_members *mi; struct bch_dev *ca; unsigned dev_idx; const char *err; 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; err = bch2_dev_in_fs(c->disk_sb.sb, sb.sb); if (err) { bch_err(c, "error bringing %s online: %s", path, err); 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(c, "error bringing %s online: error %i from bch2_trans_mark_dev_sb", path, ret); goto err; } if (ca->mi.state == BCH_MEMBER_STATE_rw) __bch2_dev_read_write(c, ca); mutex_lock(&c->sb_lock); mi = bch2_sb_get_members(c->disk_sb.sb); mi->members[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 -EINVAL; } 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 -EINVAL; } __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 *mi; int ret = 0; down_write(&c->state_lock); 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 = -EINVAL; goto err; } ret = bch2_dev_buckets_resize(c, ca, nbuckets); if (ret) { bch_err(ca, "Resize error: %i", ret); goto err; } ret = bch2_trans_mark_dev_sb(c, ca); if (ret) { goto err; } mutex_lock(&c->sb_lock); mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx]; mi->nbuckets = cpu_to_le64(nbuckets); bch2_write_super(c); mutex_unlock(&c->sb_lock); 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(-ENOENT); found: rcu_read_unlock(); return ca; } /* Filesystem open: */ struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices, struct bch_opts opts) { struct bch_sb_handle *sb = NULL; struct bch_fs *c = NULL; struct bch_sb_field_members *mi; unsigned i, best_sb = 0; const char *err; struct printbuf errbuf = PRINTBUF; int ret = 0; if (!try_module_get(THIS_MODULE)) return ERR_PTR(-ENODEV); pr_verbose_init(opts, ""); if (!nr_devices) { ret = -EINVAL; goto err; } sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL); if (!sb) { ret = -ENOMEM; goto err; } for (i = 0; i < nr_devices; i++) { ret = bch2_read_super(devices[i], &opts, &sb[i]); if (ret) 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; mi = bch2_sb_get_members(sb[best_sb].sb); i = 0; while (i < nr_devices) { if (i != best_sb && !bch2_dev_exists(sb[best_sb].sb, mi, sb[i].sb->dev_idx)) { char buf[BDEVNAME_SIZE]; pr_info("%s has been removed, skipping", bdevname(sb[i].bdev, buf)); bch2_free_super(&sb[i]); array_remove_item(sb, nr_devices, i); continue; } err = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb); if (err) goto err_print; i++; } c = bch2_fs_alloc(sb[best_sb].sb, opts); if (IS_ERR(c)) { ret = PTR_ERR(c); goto err; } down_write(&c->state_lock); for (i = 0; i < nr_devices; i++) { ret = bch2_dev_attach_bdev(c, &sb[i]); if (ret) { up_write(&c->state_lock); goto err; } } up_write(&c->state_lock); err = "insufficient devices"; if (!bch2_fs_may_start(c)) goto err_print; if (!c->opts.nostart) { ret = bch2_fs_start(c); if (ret) goto err; } out: kfree(sb); printbuf_exit(&errbuf); module_put(THIS_MODULE); pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c)); return c; err_print: pr_err("bch_fs_open err opening %s: %s", devices[0], err); ret = -EINVAL; err: if (!IS_ERR_OR_NULL(c)) bch2_fs_stop(c); if (sb) for (i = 0; i < nr_devices; i++) bch2_free_super(&sb[i]); 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 module_exit(bcachefs_exit); module_init(bcachefs_init);