diff options
Diffstat (limited to 'fs/bcachefs/super.c')
| -rw-r--r-- | fs/bcachefs/super.c | 2547 |
1 files changed, 0 insertions, 2547 deletions
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c deleted file mode 100644 index c46b1053a02c..000000000000 --- a/fs/bcachefs/super.c +++ /dev/null @@ -1,2547 +0,0 @@ -// 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 "async_objs.h" -#include "backpointers.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_node_scan.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 "debug.h" -#include "disk_accounting.h" -#include "disk_groups.h" -#include "ec.h" -#include "enumerated_ref.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 "recovery_passes.h" -#include "replicas.h" -#include "sb-clean.h" -#include "sb-counters.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 "thread_with_file.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> - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); -MODULE_DESCRIPTION("bcachefs filesystem"); - -typedef DARRAY(struct bch_sb_handle) bch_sb_handles; - -#define x(n) #n, -const char * const bch2_fs_flag_strs[] = { - BCH_FS_FLAGS() - NULL -}; - -const char * const bch2_write_refs[] = { - BCH_WRITE_REFS() - NULL -}; - -const char * const bch2_dev_read_refs[] = { - BCH_DEV_READ_REFS() - NULL -}; - -const char * const bch2_dev_write_refs[] = { - BCH_DEV_WRITE_REFS() - NULL -}; -#undef x - -static void __bch2_print_str(struct bch_fs *c, const char *prefix, - const char *str) -{ -#ifdef __KERNEL__ - struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c); - - if (unlikely(stdio)) { - bch2_stdio_redirect_printf(stdio, true, "%s", str); - return; - } -#endif - bch2_print_string_as_lines(KERN_ERR, str); -} - -void bch2_print_str(struct bch_fs *c, const char *prefix, const char *str) -{ - __bch2_print_str(c, prefix, str); -} - -__printf(2, 0) -static void bch2_print_maybe_redirect(struct stdio_redirect *stdio, const char *fmt, va_list args) -{ -#ifdef __KERNEL__ - if (unlikely(stdio)) { - if (fmt[0] == KERN_SOH[0]) - fmt += 2; - - bch2_stdio_redirect_vprintf(stdio, true, fmt, args); - return; - } -#endif - vprintk(fmt, args); -} - -void bch2_print_opts(struct bch_opts *opts, const char *fmt, ...) -{ - struct stdio_redirect *stdio = (void *)(unsigned long)opts->stdio; - - va_list args; - va_start(args, fmt); - bch2_print_maybe_redirect(stdio, fmt, args); - va_end(args); -} - -void __bch2_print(struct bch_fs *c, const char *fmt, ...) -{ - struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c); - - va_list args; - va_start(args, fmt); - bch2_print_maybe_redirect(stdio, fmt, args); - va_end(args); -} - -#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_unlink(struct bch_dev *); -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_io_ref_stop(struct bch_dev *, int); -static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *); - -struct bch_fs *bch2_dev_to_fs(dev_t dev) -{ - guard(mutex)(&bch_fs_list_lock); - guard(rcu)(); - - struct bch_fs *c; - list_for_each_entry(c, &bch_fs_list, list) - for_each_member_device_rcu(c, ca, NULL) - if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) { - closure_get(&c->cl); - return c; - } - return NULL; -} - -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) -{ - unsigned 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_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_btree_write_buffer_flush_going_ro(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); - - bch_info(c, "%sclean shutdown complete, journal seq %llu", - test_bit(BCH_FS_clean_shutdown, &c->flags) ? "" : "un", - c->journal.seq_ondisk); - - /* - * After stopping journal: - */ - for_each_member_device(c, ca) { - bch2_dev_io_ref_stop(ca, WRITE); - bch2_dev_allocator_remove(c, ca); - } -} - -static void bch2_writes_disabled(struct enumerated_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); -} - -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)); - - bch_verbose(c, "going read-only"); - - /* - * Block new foreground-end write operations from starting - any new - * writes will return -EROFS: - */ - set_bit(BCH_FS_going_ro, &c->flags); - enumerated_ref_stop_async(&c->writes); - - /* - * 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)); - - bool writes_disabled = test_bit(BCH_FS_write_disable_complete, &c->flags); - if (writes_disabled) - bch_verbose(c, "finished waiting for writes to stop"); - - __bch2_fs_read_only(c); - - wait_event(bch2_read_only_wait, - test_bit(BCH_FS_write_disable_complete, &c->flags)); - - if (!writes_disabled) - bch_verbose(c, "finished waiting for writes to stop"); - - clear_bit(BCH_FS_write_disable_complete, &c->flags); - clear_bit(BCH_FS_going_ro, &c->flags); - clear_bit(BCH_FS_rw, &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->recovery.pass_done >= BCH_RECOVERY_PASS_journal_replay) { - BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal)); - BUG_ON(atomic_long_read(&c->btree_cache.nr_dirty)); - BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty)); - BUG_ON(c->btree_write_buffer.inc.keys.nr); - BUG_ON(c->btree_write_buffer.flushing.keys.nr); - bch2_verify_accounting_clean(c); - - bch_verbose(c, "marking filesystem clean"); - bch2_fs_mark_clean(c); - } else { - /* Make sure error counts/counters are persisted */ - mutex_lock(&c->sb_lock); - bch2_write_super(c); - mutex_unlock(&c->sb_lock); - - bch_verbose(c, "done going read-only, filesystem not clean"); - } -} - -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 bool __bch2_fs_emergency_read_only2(struct bch_fs *c, struct printbuf *out, - bool locked) -{ - bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags); - - if (!locked) - bch2_journal_halt(&c->journal); - else - bch2_journal_halt_locked(&c->journal); - bch2_fs_read_only_async(c); - wake_up(&bch2_read_only_wait); - - if (ret) - prt_printf(out, "emergency read only at seq %llu\n", - journal_cur_seq(&c->journal)); - - return ret; -} - -bool bch2_fs_emergency_read_only2(struct bch_fs *c, struct printbuf *out) -{ - return __bch2_fs_emergency_read_only2(c, out, false); -} - -bool bch2_fs_emergency_read_only_locked(struct bch_fs *c) -{ - bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags); - - bch2_journal_halt_locked(&c->journal); - bch2_fs_read_only_async(c); - - wake_up(&bch2_read_only_wait); - return ret; -} - -static int __bch2_fs_read_write(struct bch_fs *c, bool early) -{ - int ret; - - BUG_ON(!test_bit(BCH_FS_may_go_rw, &c->flags)); - - if (WARN_ON(c->sb.features & BIT_ULL(BCH_FEATURE_no_alloc_info))) - return bch_err_throw(c, erofs_no_alloc_info); - - if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) { - bch_err(c, "cannot go rw, unfixed btree errors"); - return bch_err_throw(c, erofs_unfixed_errors); - } - - if (c->sb.features & BIT_ULL(BCH_FEATURE_small_image)) { - bch_err(c, "cannot go rw, filesystem is an unresized image file"); - return bch_err_throw(c, erofs_filesystem_full); - } - - if (test_bit(BCH_FS_rw, &c->flags)) - return 0; - - bch_info(c, "going read-write"); - - ret = bch2_fs_init_rw(c); - if (ret) - goto err; - - ret = bch2_sb_members_v2_init(c); - if (ret) - goto err; - - clear_bit(BCH_FS_clean_shutdown, &c->flags); - - scoped_guard(rcu) - for_each_online_member_rcu(c, ca) - if (ca->mi.state == BCH_MEMBER_STATE_rw) { - bch2_dev_allocator_add(c, ca); - enumerated_ref_start(&ca->io_ref[WRITE]); - } - - bch2_recalc_capacity(c); - - /* - * 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: - */ - spin_lock(&c->journal.lock); - set_bit(JOURNAL_need_flush_write, &c->journal.flags); - set_bit(JOURNAL_running, &c->journal.flags); - bch2_journal_space_available(&c->journal); - spin_unlock(&c->journal.lock); - - ret = bch2_fs_mark_dirty(c); - if (ret) - goto err; - - ret = bch2_journal_reclaim_start(&c->journal); - if (ret) - goto err; - - set_bit(BCH_FS_rw, &c->flags); - set_bit(BCH_FS_was_rw, &c->flags); - - enumerated_ref_start(&c->writes); - - ret = bch2_copygc_start(c); - if (ret) { - bch_err_msg(c, ret, "error starting copygc thread"); - goto err; - } - - ret = bch2_rebalance_start(c); - if (ret) { - bch_err_msg(c, ret, "error starting rebalance thread"); - 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) -{ - if (c->opts.recovery_pass_last && - c->opts.recovery_pass_last < BCH_RECOVERY_PASS_journal_replay) - return bch_err_throw(c, erofs_norecovery); - - if (c->opts.nochanges) - return bch_err_throw(c, erofs_nochanges); - - if (c->sb.features & BIT_ULL(BCH_FEATURE_no_alloc_info)) - return bch_err_throw(c, erofs_no_alloc_info); - - return __bch2_fs_read_write(c, false); -} - -int bch2_fs_read_write_early(struct bch_fs *c) -{ - down_write(&c->state_lock); - int ret = __bch2_fs_read_write(c, true); - up_write(&c->state_lock); - - return ret; -} - -/* Filesystem startup/shutdown: */ - -static void __bch2_fs_free(struct bch_fs *c) -{ - for (unsigned i = 0; i < BCH_TIME_STAT_NR; i++) - bch2_time_stats_exit(&c->times[i]); - -#ifdef CONFIG_UNICODE - utf8_unload(c->cf_encoding); -#endif - - bch2_find_btree_nodes_exit(&c->found_btree_nodes); - bch2_free_pending_node_rewrites(c); - bch2_free_fsck_errs(c); - bch2_fs_vfs_exit(c); - bch2_fs_snapshots_exit(c); - bch2_fs_sb_errors_exit(c); - bch2_fs_replicas_exit(c); - bch2_fs_rebalance_exit(c); - bch2_fs_quota_exit(c); - bch2_fs_nocow_locking_exit(c); - bch2_fs_journal_exit(&c->journal); - bch2_fs_fs_io_direct_exit(c); - bch2_fs_fs_io_buffered_exit(c); - bch2_fs_fsio_exit(c); - bch2_fs_io_write_exit(c); - bch2_fs_io_read_exit(c); - bch2_fs_encryption_exit(c); - bch2_fs_ec_exit(c); - bch2_fs_counters_exit(c); - bch2_fs_compress_exit(c); - bch2_io_clock_exit(&c->io_clock[WRITE]); - bch2_io_clock_exit(&c->io_clock[READ]); - bch2_fs_buckets_waiting_for_journal_exit(c); - bch2_fs_btree_write_buffer_exit(c); - bch2_fs_btree_key_cache_exit(&c->btree_key_cache); - bch2_fs_btree_iter_exit(c); - bch2_fs_btree_interior_update_exit(c); - bch2_fs_btree_cache_exit(c); - bch2_fs_accounting_exit(c); - bch2_fs_async_obj_exit(c); - bch2_journal_keys_put_initial(c); - bch2_find_btree_nodes_exit(&c->found_btree_nodes); - - BUG_ON(atomic_read(&c->journal_keys.ref)); - percpu_free_rwsem(&c->mark_lock); - if (c->online_reserved) { - u64 v = percpu_u64_get(c->online_reserved); - WARN(v, "online_reserved not 0 at shutdown: %lli", v); - free_percpu(c->online_reserved); - } - - darray_exit(&c->incompat_versions_requested); - darray_exit(&c->btree_roots_extra); - free_percpu(c->pcpu); - free_percpu(c->usage); - mempool_exit(&c->large_bkey_pool); - mempool_exit(&c->btree_bounce_pool); - bioset_exit(&c->btree_bio); - mempool_exit(&c->fill_iter); - enumerated_ref_exit(&c->writes); - kfree(rcu_dereference_protected(c->disk_groups, 1)); - kfree(c->journal_seq_blacklist_table); - - if (c->write_ref_wq) - destroy_workqueue(c->write_ref_wq); - if (c->btree_write_submit_wq) - destroy_workqueue(c->btree_write_submit_wq); - if (c->btree_read_complete_wq) - destroy_workqueue(c->btree_read_complete_wq); - if (c->copygc_wq) - destroy_workqueue(c->copygc_wq); - if (c->btree_write_complete_wq) - destroy_workqueue(c->btree_write_complete_wq); - if (c->btree_update_wq) - destroy_workqueue(c->btree_update_wq); - - bch2_free_super(&c->disk_sb); - kvfree(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) -{ - bch_verbose(c, "shutting down"); - - set_bit(BCH_FS_stopping, &c->flags); - - down_write(&c->state_lock); - bch2_fs_read_only(c); - up_write(&c->state_lock); - - for (unsigned i = 0; i < c->sb.nr_devices; i++) { - struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true); - if (ca) - bch2_dev_io_ref_stop(ca, READ); - } - - for_each_member_device(c, ca) - bch2_dev_unlink(ca); - - if (c->kobj.state_in_sysfs) - kobject_del(&c->kobj); - - bch2_fs_debug_exit(c); - bch2_fs_chardev_exit(c); - - bch2_ro_ref_put(c); - wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref)); - - 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(c, ca) - cancel_work_sync(&ca->io_error_work); - - cancel_work_sync(&c->read_only_work); -} - -void bch2_fs_free(struct bch_fs *c) -{ - 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 (unsigned i = 0; i < c->sb.nr_devices; i++) { - struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true); - - if (ca) { - EBUG_ON(atomic_long_read(&ca->ref) != 1); - bch2_dev_io_ref_stop(ca, READ); - 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) -{ - int ret = 0; - - lockdep_assert_held(&bch_fs_list_lock); - - if (c->sb.multi_device && - __bch2_uuid_to_fs(c->sb.uuid)) { - bch_err(c, "filesystem UUID already open"); - return bch_err_throw(c, filesystem_uuid_already_open); - } - - ret = bch2_fs_chardev_init(c); - if (ret) { - bch_err(c, "error creating character device"); - return ret; - } - - bch2_fs_debug_init(c); - - ret = (c->sb.multi_device - ? kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) - : kobject_add(&c->kobj, NULL, "%s", c->name)) ?: - kobject_add(&c->internal, &c->kobj, "internal") ?: - kobject_add(&c->opts_dir, &c->kobj, "options") ?: -#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT - kobject_add(&c->time_stats, &c->kobj, "time_stats") ?: -#endif - kobject_add(&c->counters_kobj, &c->kobj, "counters") ?: - bch2_opts_create_sysfs_files(&c->opts_dir, OPT_FS); - if (ret) { - bch_err(c, "error creating sysfs objects"); - return ret; - } - - down_write(&c->state_lock); - - for_each_member_device(c, ca) { - ret = bch2_dev_sysfs_online(c, ca); - if (ret) { - bch_err(c, "error creating sysfs objects"); - bch2_dev_put(ca); - goto err; - } - } - - BUG_ON(!list_empty(&c->list)); - list_add(&c->list, &bch_fs_list); -err: - up_write(&c->state_lock); - return ret; -} - -int bch2_fs_init_rw(struct bch_fs *c) -{ - if (test_bit(BCH_FS_rw_init_done, &c->flags)) - return 0; - - if (!(c->btree_update_wq = alloc_workqueue("bcachefs", - WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_UNBOUND, 512)) || - !(c->btree_write_complete_wq = alloc_workqueue("bcachefs_btree_write_complete", - WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) || - !(c->copygc_wq = alloc_workqueue("bcachefs_copygc", - WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) || - !(c->btree_write_submit_wq = alloc_workqueue("bcachefs_btree_write_sumit", - WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) || - !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref", - WQ_FREEZABLE, 0))) - return bch_err_throw(c, ENOMEM_fs_other_alloc); - - int ret = bch2_fs_btree_interior_update_init(c) ?: - bch2_fs_btree_write_buffer_init(c) ?: - bch2_fs_fs_io_buffered_init(c) ?: - bch2_fs_io_write_init(c) ?: - bch2_fs_journal_init(&c->journal); - if (ret) - return ret; - - set_bit(BCH_FS_rw_init_done, &c->flags); - return 0; -} - -static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts *opts, - bch_sb_handles *sbs) -{ - struct bch_fs *c; - struct printbuf name = PRINTBUF; - unsigned i, iter_size; - int ret = 0; - - c = kvmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO); - if (!c) { - c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc); - goto out; - } - - c->stdio = (void *)(unsigned long) opts->stdio; - - __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); - - refcount_set(&c->ro_ref, 1); - init_waitqueue_head(&c->ro_ref_wait); - - for (i = 0; i < BCH_TIME_STAT_NR; i++) - bch2_time_stats_init(&c->times[i]); - - bch2_fs_allocator_background_init(c); - bch2_fs_allocator_foreground_init(c); - bch2_fs_btree_cache_init_early(&c->btree_cache); - bch2_fs_btree_gc_init_early(c); - bch2_fs_btree_interior_update_init_early(c); - bch2_fs_btree_iter_init_early(c); - bch2_fs_btree_key_cache_init_early(&c->btree_key_cache); - bch2_fs_btree_write_buffer_init_early(c); - bch2_fs_copygc_init(c); - bch2_fs_ec_init_early(c); - bch2_fs_journal_init_early(&c->journal); - bch2_fs_journal_keys_init(c); - bch2_fs_move_init(c); - bch2_fs_nocow_locking_init_early(c); - bch2_fs_quota_init(c); - bch2_fs_recovery_passes_init(c); - bch2_fs_sb_errors_init_early(c); - bch2_fs_snapshots_init_early(c); - bch2_fs_subvolumes_init_early(c); - - INIT_LIST_HEAD(&c->list); - - 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_LIST_HEAD(&c->journal_iters); - - INIT_LIST_HEAD(&c->fsck_error_msgs); - mutex_init(&c->fsck_error_msgs_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->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.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq]; - - 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; - - /* 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); - - if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && - c->opts.block_size > PAGE_SIZE) { - bch_err(c, "cannot mount bs > ps filesystem without CONFIG_TRANSPARENT_HUGEPAGE"); - ret = -EINVAL; - goto err; - } - - 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; - } - - if (c->sb.multi_device) - pr_uuid(&name, c->sb.user_uuid.b); - else - prt_bdevname(&name, sbs->data[0].bdev); - - ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0; - if (ret) - goto err; - - strscpy(c->name, name.buf, sizeof(c->name)); - printbuf_exit(&name); - - iter_size = sizeof(struct sort_iter) + - (btree_blocks(c) + 1) * 2 * - sizeof(struct sort_iter_set); - - if (!(c->btree_read_complete_wq = alloc_workqueue("bcachefs_btree_read_complete", - WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 512)) || - enumerated_ref_init(&c->writes, BCH_WRITE_REF_NR, - bch2_writes_disabled) || - 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->usage = alloc_percpu(struct bch_fs_usage_base)) || - !(c->online_reserved = alloc_percpu(u64)) || - mempool_init_kvmalloc_pool(&c->btree_bounce_pool, 1, - c->opts.btree_node_size) || - mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048)) { - ret = bch_err_throw(c, ENOMEM_fs_other_alloc); - goto err; - } - - ret = - bch2_fs_async_obj_init(c) ?: - bch2_fs_btree_cache_init(c) ?: - bch2_fs_btree_iter_init(c) ?: - bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?: - bch2_fs_buckets_waiting_for_journal_init(c) ?: - bch2_io_clock_init(&c->io_clock[READ]) ?: - bch2_io_clock_init(&c->io_clock[WRITE]) ?: - bch2_fs_compress_init(c) ?: - bch2_fs_counters_init(c) ?: - bch2_fs_ec_init(c) ?: - bch2_fs_encryption_init(c) ?: - bch2_fs_fsio_init(c) ?: - bch2_fs_fs_io_direct_init(c) ?: - bch2_fs_io_read_init(c) ?: - bch2_fs_rebalance_init(c) ?: - bch2_fs_sb_errors_init(c) ?: - bch2_fs_vfs_init(c); - if (ret) - goto err; - - if (go_rw_in_recovery(c)) { - /* - * start workqueues/kworkers early - kthread creation checks for - * pending signals, which is _very_ annoying - */ - ret = bch2_fs_init_rw(c); - if (ret) - goto err; - } - -#ifdef CONFIG_UNICODE - if (bch2_fs_casefold_enabled(c)) { - /* Default encoding until we can potentially have more as an option. */ - c->cf_encoding = utf8_load(BCH_FS_DEFAULT_UTF8_ENCODING); - if (IS_ERR(c->cf_encoding)) { - printk(KERN_ERR "Cannot load UTF-8 encoding for filesystem. Version: %u.%u.%u", - unicode_major(BCH_FS_DEFAULT_UTF8_ENCODING), - unicode_minor(BCH_FS_DEFAULT_UTF8_ENCODING), - unicode_rev(BCH_FS_DEFAULT_UTF8_ENCODING)); - ret = -EINVAL; - goto err; - } - } -#else - if (c->sb.features & BIT_ULL(BCH_FEATURE_casefolding)) { - printk(KERN_ERR "Cannot mount a filesystem with casefolding on a kernel without CONFIG_UNICODE\n"); - ret = -EINVAL; - goto err; - } -#endif - - for (i = 0; i < c->sb.nr_devices; i++) { - if (!bch2_member_exists(c->disk_sb.sb, i)) - continue; - ret = bch2_dev_alloc(c, i); - if (ret) - 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_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; - CLASS(printbuf, p)(); - bch2_log_msg_start(c, &p); - - prt_str(&p, "starting version "); - bch2_version_to_text(&p, c->sb.version); - - bool first = true; - 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); - } - - if (c->sb.version_incompat_allowed != c->sb.version) { - prt_printf(&p, "\nallowing incompatible features above "); - bch2_version_to_text(&p, c->sb.version_incompat_allowed); - } - - if (c->opts.verbose) { - prt_printf(&p, "\nfeatures: "); - prt_bitflags(&p, bch2_sb_features, c->sb.features); - } - - if (c->sb.multi_device) { - prt_printf(&p, "\nwith devices"); - for_each_online_member(c, ca, BCH_DEV_READ_REF_bch2_online_devs) { - prt_char(&p, ' '); - prt_str(&p, ca->name); - } - } - - bch2_print_str(c, KERN_INFO, p.buf); -} - -static bool bch2_fs_may_start(struct bch_fs *c) -{ - struct bch_dev *ca; - unsigned flags = 0; - - switch (c->opts.degraded) { - case BCH_DEGRADED_very: - flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST; - break; - case BCH_DEGRADED_yes: - flags |= BCH_FORCE_IF_DEGRADED; - break; - default: - mutex_lock(&c->sb_lock); - for (unsigned i = 0; i < c->disk_sb.sb->nr_devices; i++) { - if (!bch2_member_exists(c->disk_sb.sb, i)) - continue; - - ca = bch2_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); - break; - } - - return bch2_have_enough_devs(c, c->online_devs, flags, true); -} - -int bch2_fs_start(struct bch_fs *c) -{ - time64_t now = ktime_get_real_seconds(); - int ret = 0; - - print_mount_opts(c); - - if (c->cf_encoding) - bch_info(c, "Using encoding defined by superblock: utf8-%u.%u.%u", - unicode_major(BCH_FS_DEFAULT_UTF8_ENCODING), - unicode_minor(BCH_FS_DEFAULT_UTF8_ENCODING), - unicode_rev(BCH_FS_DEFAULT_UTF8_ENCODING)); - - if (!bch2_fs_may_start(c)) - return bch_err_throw(c, insufficient_devices_to_start); - - down_write(&c->state_lock); - mutex_lock(&c->sb_lock); - - BUG_ON(test_bit(BCH_FS_started, &c->flags)); - - if (!bch2_sb_field_get_minsize(&c->disk_sb, ext, - sizeof(struct bch_sb_field_ext) / sizeof(u64))) { - mutex_unlock(&c->sb_lock); - up_write(&c->state_lock); - ret = bch_err_throw(c, ENOSPC_sb); - goto err; - } - - ret = bch2_sb_members_v2_init(c); - if (ret) { - mutex_unlock(&c->sb_lock); - up_write(&c->state_lock); - goto err; - } - - scoped_guard(rcu) - for_each_online_member_rcu(c, ca) - bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = - cpu_to_le64(now); - - /* - * Dno't write superblock yet: recovery might have to downgrade - */ - mutex_unlock(&c->sb_lock); - - scoped_guard(rcu) - for_each_online_member_rcu(c, ca) - if (ca->mi.state == BCH_MEMBER_STATE_rw) - bch2_dev_allocator_add(c, ca); - bch2_recalc_capacity(c); - up_write(&c->state_lock); - - c->recovery_task = current; - ret = BCH_SB_INITIALIZED(c->disk_sb.sb) - ? bch2_fs_recovery(c) - : bch2_fs_initialize(c); - c->recovery_task = NULL; - - if (ret) - goto err; - - ret = bch2_opts_hooks_pre_set(c); - if (ret) - goto err; - - if (bch2_fs_init_fault("fs_start")) { - ret = bch_err_throw(c, injected_fs_start); - goto err; - } - - set_bit(BCH_FS_started, &c->flags); - wake_up(&c->ro_ref_wait); - - down_write(&c->state_lock); - if (c->opts.read_only) - bch2_fs_read_only(c); - else if (!test_bit(BCH_FS_rw, &c->flags)) - ret = bch2_fs_read_write(c); - up_write(&c->state_lock); - -err: - if (ret) - bch_err_msg(c, ret, "starting filesystem"); - else - bch_verbose(c, "done starting filesystem"); - return ret; -} - -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_throw(c, mismatched_block_size); - - if (le16_to_cpu(m.bucket_size) < - BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb)) - return bch_err_throw(c, bucket_size_too_small); - - return 0; -} - -static int bch2_dev_in_fs(struct bch_sb_handle *fs, - struct bch_sb_handle *sb, - struct bch_opts *opts) -{ - if (fs == sb) - return 0; - - if (!uuid_equal(&fs->sb->uuid, &sb->sb->uuid)) - return -BCH_ERR_device_not_a_member_of_filesystem; - - if (!bch2_member_exists(fs->sb, sb->sb->dev_idx)) - return -BCH_ERR_device_has_been_removed; - - if (fs->sb->block_size != sb->sb->block_size) - return -BCH_ERR_mismatched_block_size; - - if (le16_to_cpu(fs->sb->version) < bcachefs_metadata_version_member_seq || - le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_member_seq) - return 0; - - if (fs->sb->seq == sb->sb->seq && - fs->sb->write_time != sb->sb->write_time) { - struct printbuf buf = PRINTBUF; - - prt_str(&buf, "Split brain detected between "); - prt_bdevname(&buf, sb->bdev); - prt_str(&buf, " and "); - prt_bdevname(&buf, fs->bdev); - prt_char(&buf, ':'); - prt_newline(&buf); - prt_printf(&buf, "seq=%llu but write_time different, got", le64_to_cpu(sb->sb->seq)); - prt_newline(&buf); - - prt_bdevname(&buf, fs->bdev); - prt_char(&buf, ' '); - bch2_prt_datetime(&buf, le64_to_cpu(fs->sb->write_time)); - prt_newline(&buf); - - prt_bdevname(&buf, sb->bdev); - prt_char(&buf, ' '); - bch2_prt_datetime(&buf, le64_to_cpu(sb->sb->write_time)); - prt_newline(&buf); - - if (!opts->no_splitbrain_check) - prt_printf(&buf, "Not using older sb"); - - pr_err("%s", buf.buf); - printbuf_exit(&buf); - - if (!opts->no_splitbrain_check) - return -BCH_ERR_device_splitbrain; - } - - struct bch_member m = bch2_sb_member_get(fs->sb, sb->sb->dev_idx); - u64 seq_from_fs = le64_to_cpu(m.seq); - u64 seq_from_member = le64_to_cpu(sb->sb->seq); - - if (seq_from_fs && seq_from_fs < seq_from_member) { - struct printbuf buf = PRINTBUF; - - prt_str(&buf, "Split brain detected between "); - prt_bdevname(&buf, sb->bdev); - prt_str(&buf, " and "); - prt_bdevname(&buf, fs->bdev); - prt_char(&buf, ':'); - prt_newline(&buf); - - prt_bdevname(&buf, fs->bdev); - prt_str(&buf, " believes seq of "); - prt_bdevname(&buf, sb->bdev); - prt_printf(&buf, " to be %llu, but ", seq_from_fs); - prt_bdevname(&buf, sb->bdev); - prt_printf(&buf, " has %llu\n", seq_from_member); - - if (!opts->no_splitbrain_check) { - prt_str(&buf, "Not using "); - prt_bdevname(&buf, sb->bdev); - } - - pr_err("%s", buf.buf); - printbuf_exit(&buf); - - if (!opts->no_splitbrain_check) - return -BCH_ERR_device_splitbrain; - } - - return 0; -} - -/* Device startup/shutdown: */ - -static void bch2_dev_io_ref_stop(struct bch_dev *ca, int rw) -{ - if (rw == READ) - clear_bit(ca->dev_idx, ca->fs->online_devs.d); - - if (!enumerated_ref_is_zero(&ca->io_ref[rw])) - enumerated_ref_stop(&ca->io_ref[rw], - rw == READ - ? bch2_dev_read_refs - : bch2_dev_write_refs); -} - -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) -{ - WARN_ON(!enumerated_ref_is_zero(&ca->io_ref[WRITE])); - WARN_ON(!enumerated_ref_is_zero(&ca->io_ref[READ])); - - cancel_work_sync(&ca->io_error_work); - - bch2_dev_unlink(ca); - - if (ca->kobj.state_in_sysfs) - kobject_del(&ca->kobj); - - bch2_bucket_bitmap_free(&ca->bucket_backpointer_mismatch); - bch2_bucket_bitmap_free(&ca->bucket_backpointer_empty); - - bch2_free_super(&ca->disk_sb); - bch2_dev_allocator_background_exit(ca); - bch2_dev_journal_exit(ca); - - free_percpu(ca->io_done); - bch2_dev_buckets_free(ca); - kfree(ca->sb_read_scratch); - - bch2_time_stats_quantiles_exit(&ca->io_latency[WRITE]); - bch2_time_stats_quantiles_exit(&ca->io_latency[READ]); - - enumerated_ref_exit(&ca->io_ref[WRITE]); - enumerated_ref_exit(&ca->io_ref[READ]); -#ifndef CONFIG_BCACHEFS_DEBUG - percpu_ref_exit(&ca->ref); -#endif - kobject_put(&ca->kobj); -} - -static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca) -{ - - lockdep_assert_held(&c->state_lock); - - if (enumerated_ref_is_zero(&ca->io_ref[READ])) - return; - - __bch2_dev_read_only(c, ca); - - bch2_dev_io_ref_stop(ca, READ); - - bch2_dev_unlink(ca); - - bch2_free_super(&ca->disk_sb); - bch2_dev_journal_exit(ca); -} - -#ifndef CONFIG_BCACHEFS_DEBUG -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); -} -#endif - -static void bch2_dev_unlink(struct bch_dev *ca) -{ - struct kobject *b; - - /* - * This is racy w.r.t. the underlying block device being hot-removed, - * which removes it from sysfs. - * - * It'd be lovely if we had a way to handle this race, but the sysfs - * code doesn't appear to provide a good method and block/holder.c is - * susceptible as well: - */ - if (ca->kobj.state_in_sysfs && - ca->disk_sb.bdev && - (b = bdev_kobj(ca->disk_sb.bdev))->state_in_sysfs) { - sysfs_remove_link(b, "bcachefs"); - sysfs_remove_link(&ca->kobj, "block"); - } -} - -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) ?: - bch2_opts_create_sysfs_files(&ca->kobj, OPT_DEVICE); - 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_WORK(&ca->io_error_work, bch2_io_error_work); - - bch2_time_stats_quantiles_init(&ca->io_latency[READ]); - bch2_time_stats_quantiles_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)); - -#ifndef CONFIG_BCACHEFS_DEBUG - if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, 0, GFP_KERNEL)) - goto err; -#else - atomic_long_set(&ca->ref, 1); -#endif - - mutex_init(&ca->bucket_backpointer_mismatch.lock); - mutex_init(&ca->bucket_backpointer_empty.lock); - - bch2_dev_allocator_background_init(ca); - - if (enumerated_ref_init(&ca->io_ref[READ], BCH_DEV_READ_REF_NR, NULL) || - enumerated_ref_init(&ca->io_ref[WRITE], BCH_DEV_WRITE_REF_NR, NULL) || - !(ca->sb_read_scratch = kmalloc(BCH_SB_READ_SCRATCH_BUF_SIZE, GFP_KERNEL)) || - bch2_dev_buckets_alloc(c, ca) || - !(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); - - if (!ca->name[0]) - 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; - - 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 0; -err: - return bch_err_throw(c, 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_throw(ca->fs, 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_throw(ca->fs, device_size_too_small); - } - - BUG_ON(!enumerated_ref_is_zero(&ca->io_ref[READ])); - BUG_ON(!enumerated_ref_is_zero(&ca->io_ref[WRITE])); - - ret = bch2_dev_journal_init(ca, sb->sb); - if (ret) - return ret; - - struct printbuf name = PRINTBUF; - prt_bdevname(&name, sb->bdev); - strscpy(ca->name, name.buf, sizeof(ca->name)); - printbuf_exit(&name); - - /* Commit: */ - ca->disk_sb = *sb; - memset(sb, 0, sizeof(*sb)); - - /* - * Stash pointer to the filesystem for blk_holder_ops - note that once - * attached to a filesystem, we will always close the block device - * before tearing down the filesystem object. - */ - ca->disk_sb.holder->c = ca->fs; - - ca->dev = ca->disk_sb.bdev->bd_dev; - - enumerated_ref_start(&ca->io_ref[READ]); - - 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(!bch2_dev_exists(c, sb->sb->dev_idx)); - - ca = bch2_dev_locked(c, sb->sb->dev_idx); - - ret = __bch2_dev_attach_bdev(ca, sb); - if (ret) - return ret; - - set_bit(ca->dev_idx, c->online_devs.d); - - bch2_dev_sysfs_online(c, ca); - - bch2_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; - int 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(c, ca2) - if (ca2 != ca) - nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw; - - required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED) - ? c->opts.metadata_replicas - : metadata_replicas_required(c), - !(flags & BCH_FORCE_IF_DATA_DEGRADED) - ? c->opts.data_replicas - : data_replicas_required(c)); - - 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 = c->online_devs; - __clear_bit(ca->dev_idx, new_online_devs.d); - - return bch2_have_enough_devs(c, new_online_devs, flags, false); - default: - BUG(); - } -} - -static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca) -{ - bch2_dev_io_ref_stop(ca, WRITE); - - /* - * The allocator thread itself allocates btree nodes, so stop it first: - */ - bch2_dev_allocator_remove(c, ca); - bch2_recalc_capacity(c); - 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); - - if (enumerated_ref_is_zero(&ca->io_ref[WRITE])) - enumerated_ref_start(&ca->io_ref[WRITE]); - - bch2_dev_do_discards(ca); -} - -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_throw(c, 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); - - bch2_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: */ - -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; - bool fast_device_removal = !bch2_request_incompat_feature(c, - bcachefs_metadata_version_fast_device_removal); - int ret; - - down_write(&c->state_lock); - - /* - * We consume a reference to ca->ref, regardless of whether we succeed - * or fail: - */ - bch2_dev_put(ca); - - if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { - bch_err(ca, "Cannot remove without losing data"); - ret = bch_err_throw(c, device_state_not_allowed); - goto err; - } - - __bch2_dev_read_only(c, ca); - - ret = fast_device_removal - ? bch2_dev_data_drop_by_backpointers(c, ca->dev_idx, flags) - : (bch2_dev_data_drop(c, ca->dev_idx, flags) ?: - bch2_dev_remove_stripes(c, ca->dev_idx, flags)); - if (ret) - goto err; - - /* Check if device still has data before blowing away alloc info */ - struct bch_dev_usage usage = bch2_dev_usage_read(ca); - for (unsigned i = 0; i < BCH_DATA_NR; i++) - if (!data_type_is_empty(i) && - !data_type_is_hidden(i) && - usage.buckets[i]) { - bch_err(ca, "Remove failed: still has data (%s, %llu buckets)", - __bch2_data_types[i], usage.buckets[i]); - ret = -EBUSY; - goto err; - } - - ret = bch2_dev_remove_alloc(c, ca); - bch_err_msg(ca, ret, "bch2_dev_remove_alloc()"); - if (ret) - goto err; - - /* - * We need to flush the entire journal to get rid of keys that reference - * the device being removed before removing the superblock entry - */ - bch2_journal_flush_all_pins(&c->journal); - - /* - * this is really just needed for the bch2_replicas_gc_(start|end) - * calls, and could be cleaned up: - */ - ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx); - bch_err_msg(ca, ret, "bch2_journal_flush_device_pins()"); - if (ret) - goto err; - - ret = bch2_journal_flush(&c->journal); - bch_err_msg(ca, ret, "bch2_journal_flush()"); - if (ret) - goto err; - - ret = bch2_replicas_gc2(c); - bch_err_msg(ca, ret, "bch2_replicas_gc2()"); - if (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); - -#ifndef CONFIG_BCACHEFS_DEBUG - percpu_ref_kill(&ca->ref); -#else - ca->dying = true; - bch2_dev_put(ca); -#endif - 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); - m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); - - if (fast_device_removal) - m->uuid = BCH_SB_MEMBER_DELETED_UUID; - else - memset(&m->uuid, 0, sizeof(m->uuid)); - - bch2_write_super(c); - - mutex_unlock(&c->sb_lock); - up_write(&c->state_lock); - return 0; -err: - if (test_bit(BCH_FS_rw, &c->flags) && - ca->mi.state == BCH_MEMBER_STATE_rw && - !enumerated_ref_is_zero(&ca->io_ref[READ])) - __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 printbuf errbuf = PRINTBUF; - struct printbuf label = PRINTBUF; - int ret = 0; - - ret = bch2_read_super(path, &opts, &sb); - bch_err_msg(c, ret, "reading super"); - if (ret) - goto err; - - struct bch_member 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; - } - } - - if (list_empty(&c->list)) { - mutex_lock(&bch_fs_list_lock); - if (__bch2_uuid_to_fs(c->sb.uuid)) - ret = bch_err_throw(c, filesystem_uuid_already_open); - else - list_add(&c->list, &bch_fs_list); - mutex_unlock(&bch_fs_list_lock); - - if (ret) { - bch_err(c, "filesystem UUID already open"); - goto err; - } - } - - ret = bch2_dev_may_add(sb.sb, c); - if (ret) - goto err; - - ca = __bch2_dev_alloc(c, &dev_mi); - if (!ca) { - ret = -ENOMEM; - goto err; - } - - ret = __bch2_dev_attach_bdev(ca, &sb); - if (ret) - goto err; - - down_write(&c->state_lock); - mutex_lock(&c->sb_lock); - SET_BCH_SB_MULTI_DEVICE(c->disk_sb.sb, true); - - ret = bch2_sb_from_fs(c, ca); - bch_err_msg(c, ret, "setting up new superblock"); - if (ret) - goto err_unlock; - - if (dynamic_fault("bcachefs:add:no_slot")) - goto err_unlock; - - ret = bch2_sb_member_alloc(c); - if (ret < 0) { - bch_err_msg(c, ret, "setting up new superblock"); - goto err_unlock; - } - unsigned dev_idx = ret; - ret = 0; - - /* success: */ - - dev_mi.last_mount = cpu_to_le64(ktime_get_real_seconds()); - *bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx) = dev_mi; - - 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); - bch_err_msg(c, ret, "creating new label"); - if (ret) - goto err_unlock; - } - - bch2_write_super(c); - mutex_unlock(&c->sb_lock); - - if (test_bit(BCH_FS_started, &c->flags)) { - ret = bch2_dev_usage_init(ca, false); - if (ret) - goto err_late; - - ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional); - bch_err_msg(ca, ret, "marking new superblock"); - if (ret) - goto err_late; - - ret = bch2_fs_freespace_init(c); - bch_err_msg(ca, ret, "initializing free space"); - if (ret) - goto err_late; - - if (ca->mi.state == BCH_MEMBER_STATE_rw) - __bch2_dev_read_write(c, ca); - - ret = bch2_dev_journal_alloc(ca, false); - bch_err_msg(c, ret, "allocating journal"); - if (ret) - goto err_late; - } - - /* - * We just changed the superblock UUID, invalidate cache and send a - * uevent to update /dev/disk/by-uuid - */ - invalidate_bdev(ca->disk_sb.bdev); - - char uuid_str[37]; - snprintf(uuid_str, sizeof(uuid_str), "UUID=%pUb", &c->sb.uuid); - - char *envp[] = { - "CHANGE=uuid", - uuid_str, - NULL, - }; - kobject_uevent_env(&ca->disk_sb.bdev->bd_device.kobj, KOBJ_CHANGE, envp); - - up_write(&c->state_lock); -out: - printbuf_exit(&label); - printbuf_exit(&errbuf); - bch_err_fn(c, ret); - return ret; - -err_unlock: - mutex_unlock(&c->sb_lock); - up_write(&c->state_lock); -err: - if (ca) - bch2_dev_free(ca); - bch2_free_super(&sb); - goto out; -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, &c->opts); - bch_err_msg(c, ret, "bringing %s online", path); - if (ret) - goto err; - - ret = bch2_dev_attach_bdev(c, &sb); - if (ret) - goto err; - - ca = bch2_dev_locked(c, dev_idx); - - ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional); - bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path); - if (ret) - 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, false); - 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_throw(c, device_state_not_allowed); - } - - __bch2_dev_offline(c, ca); - - up_write(&c->state_lock); - return 0; -} - -static int __bch2_dev_resize_alloc(struct bch_dev *ca, u64 old_nbuckets, u64 new_nbuckets) -{ - struct bch_fs *c = ca->fs; - u64 v[3] = { new_nbuckets - old_nbuckets, 0, 0 }; - - return bch2_trans_commit_do(ca->fs, NULL, NULL, 0, - bch2_disk_accounting_mod2(trans, false, v, dev_data_type, - .dev = ca->dev_idx, - .data_type = BCH_DATA_free)) ?: - bch2_dev_freespace_init(c, ca, old_nbuckets, new_nbuckets); -} - -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 (nbuckets > BCH_MEMBER_NBUCKETS_MAX) { - bch_err(ca, "New device size too big (%llu greater than max %u)", - nbuckets, BCH_MEMBER_NBUCKETS_MAX); - ret = bch_err_throw(c, device_size_too_big); - 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_throw(c, device_size_too_small); - goto err; - } - - ret = bch2_dev_buckets_resize(c, ca, nbuckets); - bch_err_msg(ca, ret, "resizing buckets"); - if (ret) - goto err; - - ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional); - 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_resize_alloc(ca, old_nbuckets, nbuckets); - if (ret) - goto err; - } - - bch2_recalc_capacity(c); -err: - up_write(&c->state_lock); - return ret; -} - -int bch2_fs_resize_on_mount(struct bch_fs *c) -{ - for_each_online_member(c, ca, BCH_DEV_READ_REF_fs_resize_on_mount) { - u64 old_nbuckets = ca->mi.nbuckets; - u64 new_nbuckets = div64_u64(get_capacity(ca->disk_sb.bdev->bd_disk), - ca->mi.bucket_size); - - if (ca->mi.resize_on_mount && - new_nbuckets > ca->mi.nbuckets) { - bch_info(ca, "resizing to size %llu", new_nbuckets * ca->mi.bucket_size); - int ret = bch2_dev_buckets_resize(c, ca, new_nbuckets); - bch_err_fn(ca, ret); - if (ret) { - enumerated_ref_put(&ca->io_ref[READ], - BCH_DEV_READ_REF_fs_resize_on_mount); - up_write(&c->state_lock); - return ret; - } - - mutex_lock(&c->sb_lock); - struct bch_member *m = - bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); - m->nbuckets = cpu_to_le64(new_nbuckets); - SET_BCH_MEMBER_RESIZE_ON_MOUNT(m, false); - - c->disk_sb.sb->features[0] &= ~cpu_to_le64(BIT_ULL(BCH_FEATURE_small_image)); - bch2_write_super(c); - mutex_unlock(&c->sb_lock); - - if (ca->mi.freespace_initialized) { - ret = __bch2_dev_resize_alloc(ca, old_nbuckets, new_nbuckets); - if (ret) { - enumerated_ref_put(&ca->io_ref[READ], - BCH_DEV_READ_REF_fs_resize_on_mount); - up_write(&c->state_lock); - return ret; - } - } - } - } - return 0; -} - -/* return with ref on ca->ref: */ -struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name) -{ - if (!strncmp(name, "/dev/", strlen("/dev/"))) - name += strlen("/dev/"); - - for_each_member_device(c, ca) - if (!strcmp(name, ca->name)) - return ca; - return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found); -} - -/* blk_holder_ops: */ - -static struct bch_fs *bdev_get_fs(struct block_device *bdev) - __releases(&bdev->bd_holder_lock) -{ - struct bch_sb_handle_holder *holder = bdev->bd_holder; - struct bch_fs *c = holder->c; - - if (c && !bch2_ro_ref_tryget(c)) - c = NULL; - - mutex_unlock(&bdev->bd_holder_lock); - - if (c) - wait_event(c->ro_ref_wait, test_bit(BCH_FS_started, &c->flags)); - return c; -} - -/* returns with ref on ca->ref */ -static struct bch_dev *bdev_to_bch_dev(struct bch_fs *c, struct block_device *bdev) -{ - for_each_member_device(c, ca) - if (ca->disk_sb.bdev == bdev) - return ca; - return NULL; -} - -static void bch2_fs_bdev_mark_dead(struct block_device *bdev, bool surprise) -{ - struct bch_fs *c = bdev_get_fs(bdev); - if (!c) - return; - - struct super_block *sb = c->vfs_sb; - if (sb) { - /* - * Not necessary, c->ro_ref guards against the filesystem being - * unmounted - we only take this to avoid a warning in - * sync_filesystem: - */ - down_read(&sb->s_umount); - } - - down_write(&c->state_lock); - struct bch_dev *ca = bdev_to_bch_dev(c, bdev); - if (!ca) - goto unlock; - - bool dev = bch2_dev_state_allowed(c, ca, - BCH_MEMBER_STATE_failed, - BCH_FORCE_IF_DEGRADED); - - if (!dev && sb) { - if (!surprise) - sync_filesystem(sb); - shrink_dcache_sb(sb); - evict_inodes(sb); - } - - struct printbuf buf = PRINTBUF; - __bch2_log_msg_start(ca->name, &buf); - - prt_printf(&buf, "offline from block layer"); - - if (dev) { - __bch2_dev_offline(c, ca); - } else { - bch2_journal_flush(&c->journal); - bch2_fs_emergency_read_only2(c, &buf); - } - - bch2_print_str(c, KERN_ERR, buf.buf); - printbuf_exit(&buf); - - bch2_dev_put(ca); -unlock: - if (sb) - up_read(&sb->s_umount); - up_write(&c->state_lock); - bch2_ro_ref_put(c); -} - -static void bch2_fs_bdev_sync(struct block_device *bdev) -{ - struct bch_fs *c = bdev_get_fs(bdev); - if (!c) - return; - - struct super_block *sb = c->vfs_sb; - if (sb) { - /* - * Not necessary, c->ro_ref guards against the filesystem being - * unmounted - we only take this to avoid a warning in - * sync_filesystem: - */ - down_read(&sb->s_umount); - sync_filesystem(sb); - up_read(&sb->s_umount); - } - - bch2_ro_ref_put(c); -} - -const struct blk_holder_ops bch2_sb_handle_bdev_ops = { - .mark_dead = bch2_fs_bdev_mark_dead, - .sync = bch2_fs_bdev_sync, -}; - -/* Filesystem open: */ - -static inline int sb_cmp(struct bch_sb *l, struct bch_sb *r) -{ - return cmp_int(le64_to_cpu(l->seq), le64_to_cpu(r->seq)) ?: - cmp_int(le64_to_cpu(l->write_time), le64_to_cpu(r->write_time)); -} - -struct bch_fs *bch2_fs_open(darray_const_str *devices, - struct bch_opts *opts) -{ - bch_sb_handles sbs = {}; - struct bch_fs *c = NULL; - struct bch_sb_handle *best = NULL; - struct printbuf errbuf = PRINTBUF; - int ret = 0; - - if (!try_module_get(THIS_MODULE)) - return ERR_PTR(-ENODEV); - - if (!devices->nr) { - ret = -EINVAL; - goto err; - } - - ret = darray_make_room(&sbs, devices->nr); - if (ret) - goto err; - - darray_for_each(*devices, i) { - struct bch_sb_handle sb = { NULL }; - - ret = bch2_read_super(*i, opts, &sb); - if (ret) - goto err; - - BUG_ON(darray_push(&sbs, sb)); - } - - if (opts->nochanges && !opts->read_only) { - ret = bch_err_throw(c, erofs_nochanges); - goto err_print; - } - - darray_for_each(sbs, sb) - if (!best || sb_cmp(sb->sb, best->sb) > 0) - best = sb; - - darray_for_each_reverse(sbs, sb) { - ret = bch2_dev_in_fs(best, sb, opts); - - if (ret == -BCH_ERR_device_has_been_removed || - ret == -BCH_ERR_device_splitbrain) { - bch2_free_super(sb); - darray_remove_item(&sbs, sb); - best -= best > sb; - ret = 0; - continue; - } - - if (ret) - goto err_print; - } - - c = bch2_fs_alloc(best->sb, opts, &sbs); - 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 (!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->data[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) DEFINE_STATIC_KEY_FALSE(bch2_##name); -BCH_DEBUG_PARAMS_ALL() -#undef BCH_DEBUG_PARAM - -static int bch2_param_set_static_key_t(const char *val, const struct kernel_param *kp) -{ - /* Match bool exactly, by re-using it. */ - struct static_key *key = kp->arg; - struct kernel_param boolkp = *kp; - bool v; - int ret; - - boolkp.arg = &v; - - ret = param_set_bool(val, &boolkp); - if (ret) - return ret; - if (v) - static_key_enable(key); - else - static_key_disable(key); - return 0; -} - -static int bch2_param_get_static_key_t(char *buffer, const struct kernel_param *kp) -{ - struct static_key *key = kp->arg; - return sprintf(buffer, "%c\n", static_key_enabled(key) ? 'N' : 'Y'); -} - -static const struct kernel_param_ops bch2_param_ops_static_key_t = { - .flags = KERNEL_PARAM_OPS_FL_NOARG, - .set = bch2_param_set_static_key_t, - .get = bch2_param_get_static_key_t, -}; - -#define BCH_DEBUG_PARAM(name, description) \ - module_param_cb(name, &bch2_param_ops_static_key_t, &bch2_##name.key, 0644);\ - __MODULE_PARM_TYPE(name, "static_key_t"); \ - 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, 0444); - -module_exit(bcachefs_exit); -module_init(bcachefs_init); |