diff options
Diffstat (limited to 'fs/bcachefs/super.c')
| -rw-r--r-- | fs/bcachefs/super.c | 1754 |
1 files changed, 1754 insertions, 0 deletions
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c new file mode 100644 index 000000000000..3191d4cc8140 --- /dev/null +++ b/fs/bcachefs/super.c @@ -0,0 +1,1754 @@ +// 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.h" +#include "btree_cache.h" +#include "btree_gc.h" +#include "btree_update_interior.h" +#include "btree_io.h" +#include "chardev.h" +#include "checksum.h" +#include "clock.h" +#include "compress.h" +#include "debug.h" +#include "disk_groups.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 "move.h" +#include "migrate.h" +#include "movinggc.h" +#include "quota.h" +#include "rebalance.h" +#include "recovery.h" +#include "replicas.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/kthread.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>"); + +#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_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_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->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; +} + +/* 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; + + bch2_rebalance_stop(c); + + for_each_member_device(ca, c, i) + bch2_copygc_stop(ca); + + bch2_gc_thread_stop(c); + + /* + * Flush journal before stopping allocators, because flushing journal + * blacklist entries involves allocating new btree nodes: + */ + bch2_journal_flush_all_pins(&c->journal); + + for_each_member_device(ca, c, i) + bch2_dev_allocator_stop(ca); + + bch2_journal_flush_all_pins(&c->journal); + + /* + * We need to explicitly wait on btree interior updates to complete + * before stopping the journal, flushing all journal pins isn't + * sufficient, because in the BTREE_INTERIOR_UPDATING_ROOT case btree + * interior updates have to drop their journal pin before they're + * fully complete: + */ + closure_wait_event(&c->btree_interior_update_wait, + !bch2_btree_interior_updates_nr_pending(c)); + + bch2_fs_journal_stop(&c->journal); + + /* + * the journal kicks off btree writes via reclaim - wait for in flight + * writes after stopping journal: + */ + if (test_bit(BCH_FS_EMERGENCY_RO, &c->flags)) + bch2_btree_flush_all_writes(c); + else + bch2_btree_verify_flushed(c); + + /* + * 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 (c->state == BCH_FS_RO) + 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: + * + * (This is really blocking new _allocations_, writes to previously + * allocated space can still happen until stopping the allocator in + * bch2_dev_allocator_stop()). + */ + percpu_ref_kill(&c->writes); + + cancel_delayed_work(&c->pd_controllers_update); + + /* + * 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)) + bch2_fs_mark_clean(c, true); + + if (c->state != BCH_FS_STOPPING) + c->state = BCH_FS_RO; +} + +static void bch2_fs_read_only_work(struct work_struct *work) +{ + struct bch_fs *c = + container_of(work, struct bch_fs, read_only_work); + + mutex_lock(&c->state_lock); + bch2_fs_read_only(c); + mutex_unlock(&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_fs_read_only_async(c); + bch2_journal_halt(&c->journal); + + wake_up(&bch_read_only_wait); + return ret; +} + +const char *bch2_fs_read_write(struct bch_fs *c) +{ + struct bch_dev *ca; + const char *err = NULL; + unsigned i; + + if (c->state == BCH_FS_RW) + return NULL; + + bch2_fs_mark_clean(c, false); + + for_each_rw_member(ca, c, i) + bch2_dev_allocator_add(c, ca); + bch2_recalc_capacity(c); + + err = "error starting allocator thread"; + for_each_rw_member(ca, c, i) + if (bch2_dev_allocator_start(ca)) { + percpu_ref_put(&ca->io_ref); + goto err; + } + + err = "error starting btree GC thread"; + if (bch2_gc_thread_start(c)) + goto err; + + err = "error starting copygc thread"; + for_each_rw_member(ca, c, i) + if (bch2_copygc_start(c, ca)) { + percpu_ref_put(&ca->io_ref); + goto err; + } + + err = "error starting rebalance thread"; + if (bch2_rebalance_start(c)) + goto err; + + schedule_delayed_work(&c->pd_controllers_update, 5 * HZ); + + if (c->state != BCH_FS_STARTING) + percpu_ref_reinit(&c->writes); + + c->state = BCH_FS_RW; + return NULL; +err: + __bch2_fs_read_only(c); + return err; +} + +/* 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_fs_quota_exit(c); + bch2_fs_fsio_exit(c); + bch2_fs_encryption_exit(c); + bch2_fs_io_exit(c); + bch2_fs_btree_cache_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); + percpu_free_rwsem(&c->usage_lock); + free_percpu(c->usage_percpu); + mempool_exit(&c->btree_bounce_pool); + bioset_exit(&c->btree_bio); + mempool_exit(&c->btree_interior_update_pool); + mempool_exit(&c->btree_reserve_pool); + mempool_exit(&c->fill_iter); + percpu_ref_exit(&c->writes); + kfree(rcu_dereference_protected(c->replicas, 1)); + kfree(rcu_dereference_protected(c->disk_groups, 1)); + + if (c->copygc_wq) + destroy_workqueue(c->copygc_wq); + if (c->wq) + destroy_workqueue(c->wq); + + free_pages((unsigned long) c->disk_sb.sb, + c->disk_sb.page_order); + 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; + + 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->time_stats); + kobject_put(&c->opts_dir); + kobject_put(&c->internal); + + 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); + + mutex_lock(&c->state_lock); + bch2_fs_read_only(c); + mutex_unlock(&c->state_lock); + + /* 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->btree_write_error_work); + cancel_delayed_work_sync(&c->pd_controllers_update); + cancel_work_sync(&c->read_only_work); + + for (i = 0; i < c->sb.nr_devices; i++) + if (c->devs[i]) + bch2_dev_free(rcu_dereference_protected(c->devs[i], 1)); + + kobject_put(&c->kobj); +} + +static const char *bch2_fs_online(struct bch_fs *c) +{ + struct bch_dev *ca; + const char *err = NULL; + unsigned i; + int ret; + + lockdep_assert_held(&bch_fs_list_lock); + + if (!list_empty(&c->list)) + return NULL; + + if (__bch2_uuid_to_fs(c->sb.uuid)) + return "filesystem UUID already open"; + + ret = bch2_fs_chardev_init(c); + if (ret) + return "error creating character device"; + + bch2_fs_debug_init(c); + + if (kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) || + kobject_add(&c->internal, &c->kobj, "internal") || + kobject_add(&c->opts_dir, &c->kobj, "options") || + kobject_add(&c->time_stats, &c->kobj, "time_stats") || + bch2_opts_create_sysfs_files(&c->opts_dir)) + return "error creating sysfs objects"; + + mutex_lock(&c->state_lock); + + err = "error creating sysfs objects"; + __for_each_member_device(ca, c, i, NULL) + if (bch2_dev_sysfs_online(c, ca)) + goto err; + + list_add(&c->list, &bch_fs_list); + err = NULL; +err: + mutex_unlock(&c->state_lock); + return err; +} + +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; + unsigned i, iter_size; + const char *err; + + pr_verbose_init(opts, ""); + + c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO); + if (!c) + goto out; + + __module_get(THIS_MODULE); + + c->minor = -1; + c->disk_sb.fs_sb = true; + + mutex_init(&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); + + for (i = 0; i < BCH_TIME_STAT_NR; i++) + bch2_time_stats_init(&c->times[i]); + + bch2_fs_allocator_init(c); + bch2_fs_rebalance_init(c); + bch2_fs_quota_init(c); + + INIT_LIST_HEAD(&c->list); + + INIT_LIST_HEAD(&c->btree_interior_update_list); + mutex_init(&c->btree_reserve_cache_lock); + mutex_init(&c->btree_interior_update_lock); + + mutex_init(&c->bio_bounce_pages_lock); + + bio_list_init(&c->btree_write_error_list); + spin_lock_init(&c->btree_write_error_lock); + INIT_WORK(&c->btree_write_error_work, bch2_btree_write_error_work); + + INIT_LIST_HEAD(&c->fsck_errors); + mutex_init(&c->fsck_error_lock); + + seqcount_init(&c->gc_pos_lock); + + c->copy_gc_enabled = 1; + c->rebalance.enabled = 1; + c->promote_whole_extents = true; + + c->journal.write_time = &c->times[BCH_TIME_journal_write]; + c->journal.delay_time = &c->times[BCH_TIME_journal_delay]; + c->journal.blocked_time = &c->times[BCH_TIME_journal_blocked]; + c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq]; + + bch2_fs_btree_cache_init_early(&c->btree_cache); + + mutex_lock(&c->sb_lock); + + if (bch2_sb_to_fs(c, sb)) { + mutex_unlock(&c->sb_lock); + goto err; + } + + mutex_unlock(&c->sb_lock); + + scnprintf(c->name, sizeof(c->name), "%pU", &c->sb.user_uuid); + + c->opts = bch2_opts_default; + bch2_opts_apply(&c->opts, bch2_opts_from_sb(sb)); + bch2_opts_apply(&c->opts, opts); + + c->block_bits = ilog2(c->opts.block_size); + c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c); + + c->opts.nochanges |= c->opts.noreplay; + c->opts.read_only |= c->opts.nochanges; + + if (bch2_fs_init_fault("fs_alloc")) + goto err; + + iter_size = sizeof(struct btree_node_iter_large) + + (btree_blocks(c) + 1) * 2 * + sizeof(struct btree_node_iter_set); + + if (!(c->wq = alloc_workqueue("bcachefs", + WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) || + !(c->copygc_wq = alloc_workqueue("bcache_copygc", + WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) || + percpu_ref_init(&c->writes, bch2_writes_disabled, 0, GFP_KERNEL) || + mempool_init_kmalloc_pool(&c->btree_reserve_pool, 1, + sizeof(struct btree_reserve)) || + mempool_init_kmalloc_pool(&c->btree_interior_update_pool, 1, + sizeof(struct btree_update)) || + 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->usage_percpu = alloc_percpu(struct bch_fs_usage)) || + percpu_init_rwsem(&c->usage_lock) || + mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1, + btree_bytes(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_btree_cache_init(c) || + bch2_fs_io_init(c) || + bch2_fs_encryption_init(c) || + bch2_fs_compress_init(c) || + bch2_fs_fsio_init(c)) + 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)) + goto err; + + /* + * Now that all allocations have succeeded, init various refcounty + * things that let us shutdown: + */ + 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); + + mutex_lock(&bch_fs_list_lock); + err = bch2_fs_online(c); + mutex_unlock(&bch_fs_list_lock); + if (err) { + bch_err(c, "bch2_fs_online() error: %s", err); + goto err; + } +out: + pr_verbose_init(opts, "ret %i", c ? 0 : -ENOMEM); + return c; +err: + bch2_fs_free(c); + c = NULL; + goto out; +} + +const char *bch2_fs_start(struct bch_fs *c) +{ + const char *err = "cannot allocate memory"; + struct bch_sb_field_members *mi; + struct bch_dev *ca; + time64_t now = ktime_get_seconds(); + unsigned i; + int ret = -EINVAL; + + mutex_lock(&c->state_lock); + + BUG_ON(c->state != BCH_FS_STARTING); + + 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; + + err = "dynamic fault"; + if (bch2_fs_init_fault("fs_start")) + goto err; + + if (c->opts.read_only) { + bch2_fs_read_only(c); + } else { + err = bch2_fs_read_write(c); + if (err) + goto err; + } + + set_bit(BCH_FS_STARTED, &c->flags); + + err = NULL; +out: + mutex_unlock(&c->state_lock); + return err; +err: + switch (ret) { + case BCH_FSCK_ERRORS_NOT_FIXED: + bch_err(c, "filesystem contains errors: please report this to the developers"); + pr_cont("mount with -o fix_errors to repair\n"); + err = "fsck error"; + break; + case BCH_FSCK_REPAIR_UNIMPLEMENTED: + bch_err(c, "filesystem contains errors: please report this to the developers"); + pr_cont("repair unimplemented: inform the developers so that it can be added\n"); + err = "fsck error"; + break; + case BCH_FSCK_REPAIR_IMPOSSIBLE: + bch_err(c, "filesystem contains errors, but repair impossible"); + err = "fsck error"; + break; + case BCH_FSCK_UNKNOWN_VERSION: + err = "unknown metadata version";; + break; + case -ENOMEM: + err = "cannot allocate memory"; + break; + case -EIO: + err = "IO error"; + break; + } + + BUG_ON(!err); + set_bit(BCH_FS_ERROR, &c->flags); + goto out; +} + +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) != c->opts.block_size) + return "mismatched block size"; + + if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) < + BCH_SB_BTREE_NODE_SIZE(c->disk_sb.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_equal(&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); + + 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); + + writepoint_init(&ca->copygc_write_point, BCH_DATA_USER); + + spin_lock_init(&ca->freelist_lock); + bch2_dev_copygc_init(ca); + + 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; + + if (opt_defined(c->opts, discard)) + ca->mi.discard = opt_get(c->opts, discard); + + 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) || + 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; + + 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; + memset(sb, 0, sizeof(*sb)); + + if (ca->fs) + mutex_lock(&ca->fs->sb_lock); + + bch2_mark_dev_superblock(ca->fs, ca, BCH_BUCKET_MARK_MAY_MAKE_UNAVAILABLE); + + if (ca->fs) + mutex_unlock(&ca->fs->sb_lock); + + 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 replicas_status s; + 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); + + s = __bch2_replicas_status(c, new_online_devs); + + return bch2_have_enough_devs(s, flags); + default: + BUG(); + } +} + +static bool bch2_fs_may_start(struct bch_fs *c) +{ + struct replicas_status s; + struct bch_sb_field_members *mi; + struct bch_dev *ca; + unsigned i, flags = c->opts.degraded + ? BCH_FORCE_IF_DEGRADED + : 0; + + if (!c->opts.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); + } + + s = bch2_replicas_status(c); + + return bch2_have_enough_devs(s, flags); +} + +static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca) +{ + bch2_copygc_stop(ca); + + /* + * The allocator thread itself allocates btree nodes, so stop it first: + */ + bch2_dev_allocator_stop(ca); + bch2_dev_allocator_remove(c, ca); + bch2_dev_journal_stop(&c->journal, ca); +} + +static const char *__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); + + if (bch2_dev_allocator_start(ca)) + return "error starting allocator thread"; + + if (bch2_copygc_start(c, ca)) + return "error starting copygc thread"; + + return NULL; +} + +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_dev_state[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)) + ret = -ENOMEM; + + 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; + + mutex_lock(&c->state_lock); + ret = __bch2_dev_set_state(c, ca, new_state, flags); + mutex_unlock(&c->state_lock); + + return ret; +} + +/* Device add/removal: */ + +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; + + mutex_lock(&c->state_lock); + + percpu_ref_put(&ca->ref); /* XXX */ + + 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); + + /* + * XXX: verify that dev_idx is really not in use anymore, anywhere + * + * flag_data_bad() does not check btree pointers + */ + 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_journal_flush_device_pins(&c->journal, ca->dev_idx); + if (ret) { + bch_err(ca, "Remove failed: error %i flushing journal", ret); + goto err; + } + + data = bch2_dev_has_data(c, ca); + if (data) { + char data_has_str[100]; + bch2_scnprint_flag_list(data_has_str, + sizeof(data_has_str), + bch2_data_types, + data); + bch_err(ca, "Remove failed, still has data (%s)", data_has_str); + ret = -EBUSY; + goto err; + } + + ret = bch2_btree_delete_range(c, BTREE_ID_ALLOC, + POS(ca->dev_idx, 0), + POS(ca->dev_idx + 1, 0), + ZERO_VERSION, + NULL, NULL, NULL); + if (ret) { + bch_err(ca, "Remove failed, error deleting alloc info"); + goto err; + } + + /* + * must flush all existing journal entries, they might have + * (overwritten) keys that point to the device we're removing: + */ + bch2_journal_flush_all_pins(&c->journal); + ret = bch2_journal_error(&c->journal); + if (ret) { + bch_err(ca, "Remove failed, journal error"); + 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); + mutex_unlock(&c->state_lock); + return 0; +err: + if (ca->mi.state == BCH_MEMBER_STATE_RW) + __bch2_dev_read_write(c, ca); + mutex_unlock(&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; + int ret; + + ret = bch2_read_super(path, &opts, &sb); + if (ret) + return ret; + + err = bch2_sb_validate(&sb); + if (err) + return -EINVAL; + + dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx]; + + err = bch2_dev_may_add(sb.sb, c); + if (err) + return -EINVAL; + + ca = __bch2_dev_alloc(c, &dev_mi); + if (!ca) { + bch2_free_super(&sb); + return -ENOMEM; + } + + ret = __bch2_dev_attach_bdev(ca, &sb); + if (ret) { + bch2_dev_free(ca); + return ret; + } + + err = "journal alloc failed"; + ret = bch2_dev_journal_alloc(ca); + if (ret) + goto err; + + mutex_lock(&c->state_lock); + mutex_lock(&c->sb_lock); + + err = "insufficient space in new superblock"; + ret = bch2_sb_from_fs(c, ca); + if (ret) + 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))) { + 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: + err = "no slots available in superblock"; + ret = -ENOSPC; + goto err_unlock; + +have_slot: + nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices); + u64s = (sizeof(struct bch_sb_field_members) + + sizeof(struct bch_member) * nr_devices) / sizeof(u64); + + err = "no space in superblock for member info"; + ret = -ENOSPC; + + mi = bch2_sb_resize_members(&c->disk_sb, u64s); + if (!mi) + goto err_unlock; + + /* success: */ + + mi->members[dev_idx] = dev_mi; + mi->members[dev_idx].last_mount = cpu_to_le64(ktime_get_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); + + if (ca->mi.state == BCH_MEMBER_STATE_RW) { + err = __bch2_dev_read_write(c, ca); + if (err) + goto err_late; + } + + mutex_unlock(&c->state_lock); + return 0; + +err_unlock: + mutex_unlock(&c->sb_lock); + mutex_unlock(&c->state_lock); +err: + if (ca) + bch2_dev_free(ca); + bch2_free_super(&sb); + bch_err(c, "Unable to add device: %s", err); + return ret; +err_late: + bch_err(c, "Error going rw after adding device: %s", err); + return -EINVAL; +} + +/* 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; + + mutex_lock(&c->state_lock); + + ret = bch2_read_super(path, &opts, &sb); + if (ret) { + mutex_unlock(&c->state_lock); + return ret; + } + + dev_idx = sb.sb->dev_idx; + + err = bch2_dev_in_fs(c->disk_sb.sb, sb.sb); + if (err) + goto err; + + if (bch2_dev_attach_bdev(c, &sb)) { + err = "bch2_dev_attach_bdev() error"; + goto err; + } + + ca = bch_dev_locked(c, dev_idx); + if (ca->mi.state == BCH_MEMBER_STATE_RW) { + err = __bch2_dev_read_write(c, ca); + if (err) + goto err; + } + + 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_seconds()); + + bch2_write_super(c); + mutex_unlock(&c->sb_lock); + + mutex_unlock(&c->state_lock); + return 0; +err: + mutex_unlock(&c->state_lock); + bch2_free_super(&sb); + bch_err(c, "error bringing %s online: %s", path, err); + return -EINVAL; +} + +int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags) +{ + mutex_lock(&c->state_lock); + + if (!bch2_dev_is_online(ca)) { + bch_err(ca, "Already offline"); + mutex_unlock(&c->state_lock); + return 0; + } + + if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) { + bch_err(ca, "Cannot offline required disk"); + mutex_unlock(&c->state_lock); + return -EINVAL; + } + + __bch2_dev_offline(c, ca); + + mutex_unlock(&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; + + mutex_lock(&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; + } + + 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: + mutex_unlock(&c->state_lock); + return ret; +} + +/* return with ref on ca->ref: */ +struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *path) +{ + + struct bch_dev *ca; + dev_t dev; + unsigned i; + int ret; + + ret = lookup_bdev(path, &dev); + if (ret) + return ERR_PTR(ret); + + for_each_member_device(ca, c, i) + if (ca->disk_sb.bdev->bd_dev == dev) + goto found; + + ca = ERR_PTR(-ENOENT); +found: + 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; + unsigned i, best_sb = 0; + const char *err; + int ret = -ENOMEM; + + pr_verbose_init(opts, ""); + + if (!nr_devices) { + c = ERR_PTR(-EINVAL); + goto out2; + } + + if (!try_module_get(THIS_MODULE)) { + c = ERR_PTR(-ENODEV); + goto out2; + } + + sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL); + if (!sb) + goto err; + + for (i = 0; i < nr_devices; i++) { + ret = bch2_read_super(devices[i], &opts, &sb[i]); + if (ret) + goto err; + + err = bch2_sb_validate(&sb[i]); + if (err) + goto err_print; + } + + for (i = 1; i < nr_devices; i++) + if (le64_to_cpu(sb[i].sb->seq) > + le64_to_cpu(sb[best_sb].sb->seq)) + best_sb = i; + + for (i = 0; i < nr_devices; i++) { + err = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb); + if (err) + goto err_print; + } + + ret = -ENOMEM; + c = bch2_fs_alloc(sb[best_sb].sb, opts); + if (!c) + goto err; + + err = "bch2_dev_online() error"; + mutex_lock(&c->state_lock); + for (i = 0; i < nr_devices; i++) + if (bch2_dev_attach_bdev(c, &sb[i])) { + mutex_unlock(&c->state_lock); + goto err_print; + } + mutex_unlock(&c->state_lock); + + err = "insufficient devices"; + if (!bch2_fs_may_start(c)) + goto err_print; + + if (!c->opts.nostart) { + err = bch2_fs_start(c); + if (err) + goto err_print; + } +out: + kfree(sb); + module_put(THIS_MODULE); +out2: + 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 (c) + bch2_fs_stop(c); + for (i = 0; i < nr_devices; i++) + bch2_free_super(&sb[i]); + c = ERR_PTR(ret); + goto out; +} + +static const char *__bch2_fs_open_incremental(struct bch_sb_handle *sb, + struct bch_opts opts) +{ + const char *err; + struct bch_fs *c; + bool allocated_fs = false; + + err = bch2_sb_validate(sb); + if (err) + return err; + + mutex_lock(&bch_fs_list_lock); + c = __bch2_uuid_to_fs(sb->sb->uuid); + if (c) { + closure_get(&c->cl); + + err = bch2_dev_in_fs(c->disk_sb.sb, sb->sb); + if (err) + goto err; + } else { + c = bch2_fs_alloc(sb->sb, opts); + err = "cannot allocate memory"; + if (!c) + goto err; + + allocated_fs = true; + } + + err = "bch2_dev_online() error"; + + mutex_lock(&c->sb_lock); + if (bch2_dev_attach_bdev(c, sb)) { + mutex_unlock(&c->sb_lock); + goto err; + } + mutex_unlock(&c->sb_lock); + + if (!c->opts.nostart && bch2_fs_may_start(c)) { + err = bch2_fs_start(c); + if (err) + goto err; + } + + closure_put(&c->cl); + mutex_unlock(&bch_fs_list_lock); + + return NULL; +err: + mutex_unlock(&bch_fs_list_lock); + + if (allocated_fs) + bch2_fs_stop(c); + else if (c) + closure_put(&c->cl); + + return err; +} + +const char *bch2_fs_open_incremental(const char *path) +{ + struct bch_sb_handle sb; + struct bch_opts opts = bch2_opts_empty(); + const char *err; + + if (bch2_read_super(path, &opts, &sb)) + return "error reading superblock"; + + err = __bch2_fs_open_incremental(&sb, opts); + bch2_free_super(&sb); + + return err; +} + +/* Global interfaces/init */ + +static void bcachefs_exit(void) +{ + bch2_debug_exit(); + bch2_vfs_exit(); + bch2_chardev_exit(); + if (bcachefs_kset) + kset_unregister(bcachefs_kset); +} + +static int __init bcachefs_init(void) +{ + bch2_bkey_pack_test(); + bch2_inode_pack_test(); + + if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) || + 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 + +unsigned bch2_metadata_version = BCH_SB_VERSION_MAX; +module_param_named(version, bch2_metadata_version, uint, 0400); + +module_exit(bcachefs_exit); +module_init(bcachefs_init); |