| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * bcachefs setup/teardown code, and some metadata io - read a superblock and |
| * figure out what to do with it. |
| * |
| * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> |
| * Copyright 2012 Google, Inc. |
| */ |
| |
| #include "bcachefs.h" |
| #include "alloc_background.h" |
| #include "alloc_foreground.h" |
| #include "bkey_sort.h" |
| #include "btree_cache.h" |
| #include "btree_gc.h" |
| #include "btree_journal_iter.h" |
| #include "btree_key_cache.h" |
| #include "btree_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_groups.h" |
| #include "ec.h" |
| #include "errcode.h" |
| #include "error.h" |
| #include "fs.h" |
| #include "fs-io.h" |
| #include "fs-io-buffered.h" |
| #include "fs-io-direct.h" |
| #include "fsck.h" |
| #include "inode.h" |
| #include "io_read.h" |
| #include "io_write.h" |
| #include "journal.h" |
| #include "journal_reclaim.h" |
| #include "journal_seq_blacklist.h" |
| #include "move.h" |
| #include "migrate.h" |
| #include "movinggc.h" |
| #include "nocow_locking.h" |
| #include "quota.h" |
| #include "rebalance.h" |
| #include "recovery.h" |
| #include "replicas.h" |
| #include "sb-clean.h" |
| #include "sb-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> |
| #include <crypto/hash.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); |
| MODULE_DESCRIPTION("bcachefs filesystem"); |
| MODULE_SOFTDEP("pre: crc32c"); |
| MODULE_SOFTDEP("pre: crc64"); |
| MODULE_SOFTDEP("pre: sha256"); |
| MODULE_SOFTDEP("pre: chacha20"); |
| MODULE_SOFTDEP("pre: poly1305"); |
| MODULE_SOFTDEP("pre: xxhash"); |
| |
| const char * const bch2_fs_flag_strs[] = { |
| #define x(n) #n, |
| BCH_FS_FLAGS() |
| #undef x |
| NULL |
| }; |
| |
| __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_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; |
| |
| mutex_lock(&bch_fs_list_lock); |
| rcu_read_lock(); |
| |
| 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); |
| goto found; |
| } |
| c = NULL; |
| found: |
| rcu_read_unlock(); |
| mutex_unlock(&bch_fs_list_lock); |
| |
| return c; |
| } |
| |
| static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid) |
| { |
| struct bch_fs *c; |
| |
| lockdep_assert_held(&bch_fs_list_lock); |
| |
| list_for_each_entry(c, &bch_fs_list, list) |
| if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid))) |
| return c; |
| |
| return NULL; |
| } |
| |
| struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid) |
| { |
| struct bch_fs *c; |
| |
| mutex_lock(&bch_fs_list_lock); |
| c = __bch2_uuid_to_fs(uuid); |
| if (c) |
| closure_get(&c->cl); |
| mutex_unlock(&bch_fs_list_lock); |
| |
| return c; |
| } |
| |
| static void bch2_dev_usage_journal_reserve(struct bch_fs *c) |
| { |
| unsigned nr = 0, u64s = |
| ((sizeof(struct jset_entry_dev_usage) + |
| sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) / |
| sizeof(u64); |
| |
| rcu_read_lock(); |
| for_each_member_device_rcu(c, ca, NULL) |
| nr++; |
| rcu_read_unlock(); |
| |
| bch2_journal_entry_res_resize(&c->journal, |
| &c->dev_usage_journal_res, u64s * nr); |
| } |
| |
| /* Filesystem RO/RW: */ |
| |
| /* |
| * For startup/shutdown of RW stuff, the dependencies are: |
| * |
| * - foreground writes depend on copygc and rebalance (to free up space) |
| * |
| * - copygc and rebalance depend on mark and sweep gc (they actually probably |
| * don't because they either reserve ahead of time or don't block if |
| * allocations fail, but allocations can require mark and sweep gc to run |
| * because of generation number wraparound) |
| * |
| * - all of the above depends on the allocator threads |
| * |
| * - allocator depends on the journal (when it rewrites prios and gens) |
| */ |
| |
| static void __bch2_fs_read_only(struct bch_fs *c) |
| { |
| 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_gc_thread_stop(c); |
| bch2_fs_ec_flush(c); |
| |
| bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu", |
| journal_cur_seq(&c->journal)); |
| |
| do { |
| clean_passes++; |
| |
| if (bch2_btree_interior_updates_flush(c) || |
| bch2_journal_flush_all_pins(&c->journal) || |
| bch2_btree_flush_all_writes(c) || |
| seq != atomic64_read(&c->journal.seq)) { |
| seq = atomic64_read(&c->journal.seq); |
| clean_passes = 0; |
| } |
| } while (clean_passes < 2); |
| |
| bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu", |
| journal_cur_seq(&c->journal)); |
| |
| if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) && |
| !test_bit(BCH_FS_emergency_ro, &c->flags)) |
| set_bit(BCH_FS_clean_shutdown, &c->flags); |
| |
| bch2_fs_journal_stop(&c->journal); |
| |
| bch_info(c, "%sshutdown 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_allocator_remove(c, ca); |
| } |
| |
| #ifndef BCH_WRITE_REF_DEBUG |
| static void bch2_writes_disabled(struct percpu_ref *writes) |
| { |
| struct bch_fs *c = container_of(writes, struct bch_fs, writes); |
| |
| set_bit(BCH_FS_write_disable_complete, &c->flags); |
| wake_up(&bch2_read_only_wait); |
| } |
| #endif |
| |
| void bch2_fs_read_only(struct bch_fs *c) |
| { |
| if (!test_bit(BCH_FS_rw, &c->flags)) { |
| bch2_journal_reclaim_stop(&c->journal); |
| return; |
| } |
| |
| BUG_ON(test_bit(BCH_FS_write_disable_complete, &c->flags)); |
| |
| 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); |
| #ifndef BCH_WRITE_REF_DEBUG |
| percpu_ref_kill(&c->writes); |
| #else |
| for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) |
| bch2_write_ref_put(c, i); |
| #endif |
| |
| /* |
| * If we're not doing an emergency shutdown, we want to wait on |
| * outstanding writes to complete so they don't see spurious errors due |
| * to shutting down the allocator: |
| * |
| * If we are doing an emergency shutdown outstanding writes may |
| * hang until we shutdown the allocator so we don't want to wait |
| * on outstanding writes before shutting everything down - but |
| * we do need to wait on them before returning and signalling |
| * that going RO is complete: |
| */ |
| wait_event(bch2_read_only_wait, |
| test_bit(BCH_FS_write_disable_complete, &c->flags) || |
| test_bit(BCH_FS_emergency_ro, &c->flags)); |
| |
| 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_read(&c->btree_cache.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); |
| |
| bch_verbose(c, "marking filesystem clean"); |
| bch2_fs_mark_clean(c); |
| } else { |
| 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 int bch2_fs_read_write_late(struct bch_fs *c) |
| { |
| int ret; |
| |
| /* |
| * Data move operations can't run until after check_snapshots has |
| * completed, and bch2_snapshot_is_ancestor() is available. |
| * |
| * Ideally we'd start copygc/rebalance earlier instead of waiting for |
| * all of recovery/fsck to complete: |
| */ |
| ret = bch2_copygc_start(c); |
| if (ret) { |
| bch_err(c, "error starting copygc thread"); |
| return ret; |
| } |
| |
| ret = bch2_rebalance_start(c); |
| if (ret) { |
| bch_err(c, "error starting rebalance thread"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int __bch2_fs_read_write(struct bch_fs *c, bool early) |
| { |
| int ret; |
| |
| if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) { |
| bch_err(c, "cannot go rw, unfixed btree errors"); |
| return -BCH_ERR_erofs_unfixed_errors; |
| } |
| |
| if (test_bit(BCH_FS_rw, &c->flags)) |
| return 0; |
| |
| bch_info(c, "going read-write"); |
| |
| ret = bch2_sb_members_v2_init(c); |
| if (ret) |
| goto err; |
| |
| ret = bch2_fs_mark_dirty(c); |
| if (ret) |
| goto err; |
| |
| clear_bit(BCH_FS_clean_shutdown, &c->flags); |
| |
| /* |
| * First journal write must be a flush write: after a clean shutdown we |
| * don't read the journal, so the first journal write may end up |
| * overwriting whatever was there previously, and there must always be |
| * at least one non-flush write in the journal or recovery will fail: |
| */ |
| set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags); |
| set_bit(JOURNAL_RUNNING, &c->journal.flags); |
| |
| for_each_rw_member(c, ca) |
| bch2_dev_allocator_add(c, ca); |
| bch2_recalc_capacity(c); |
| |
| set_bit(BCH_FS_rw, &c->flags); |
| set_bit(BCH_FS_was_rw, &c->flags); |
| |
| #ifndef BCH_WRITE_REF_DEBUG |
| percpu_ref_reinit(&c->writes); |
| #else |
| for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) { |
| BUG_ON(atomic_long_read(&c->writes[i])); |
| atomic_long_inc(&c->writes[i]); |
| } |
| #endif |
| |
| ret = bch2_gc_thread_start(c); |
| if (ret) { |
| bch_err(c, "error starting gc thread"); |
| return ret; |
| } |
| |
| ret = bch2_journal_reclaim_start(&c->journal); |
| if (ret) |
| goto err; |
| |
| if (!early) { |
| ret = bch2_fs_read_write_late(c); |
| if (ret) |
| goto err; |
| } |
| |
| bch2_do_discards(c); |
| bch2_do_invalidates(c); |
| bch2_do_stripe_deletes(c); |
| bch2_do_pending_node_rewrites(c); |
| return 0; |
| err: |
| if (test_bit(BCH_FS_rw, &c->flags)) |
| bch2_fs_read_only(c); |
| else |
| __bch2_fs_read_only(c); |
| return ret; |
| } |
| |
| int bch2_fs_read_write(struct bch_fs *c) |
| { |
| if (c->opts.recovery_pass_last && |
| c->opts.recovery_pass_last < BCH_RECOVERY_PASS_journal_replay) |
| return -BCH_ERR_erofs_norecovery; |
| |
| if (c->opts.nochanges) |
| return -BCH_ERR_erofs_nochanges; |
| |
| return __bch2_fs_read_write(c, false); |
| } |
| |
| int bch2_fs_read_write_early(struct bch_fs *c) |
| { |
| lockdep_assert_held(&c->state_lock); |
| |
| return __bch2_fs_read_write(c, true); |
| } |
| |
| /* Filesystem startup/shutdown: */ |
| |
| static void __bch2_fs_free(struct bch_fs *c) |
| { |
| unsigned i; |
| |
| for (i = 0; i < BCH_TIME_STAT_NR; i++) |
| bch2_time_stats_exit(&c->times[i]); |
| |
| bch2_find_btree_nodes_exit(&c->found_btree_nodes); |
| bch2_free_pending_node_rewrites(c); |
| bch2_fs_allocator_background_exit(c); |
| bch2_fs_sb_errors_exit(c); |
| bch2_fs_counters_exit(c); |
| bch2_fs_snapshots_exit(c); |
| bch2_fs_quota_exit(c); |
| bch2_fs_fs_io_direct_exit(c); |
| bch2_fs_fs_io_buffered_exit(c); |
| bch2_fs_fsio_exit(c); |
| bch2_fs_ec_exit(c); |
| bch2_fs_encryption_exit(c); |
| bch2_fs_nocow_locking_exit(c); |
| bch2_fs_io_write_exit(c); |
| bch2_fs_io_read_exit(c); |
| bch2_fs_buckets_waiting_for_journal_exit(c); |
| bch2_fs_btree_interior_update_exit(c); |
| bch2_fs_btree_iter_exit(c); |
| bch2_fs_btree_key_cache_exit(&c->btree_key_cache); |
| bch2_fs_btree_cache_exit(c); |
| bch2_fs_replicas_exit(c); |
| bch2_fs_journal_exit(&c->journal); |
| bch2_io_clock_exit(&c->io_clock[WRITE]); |
| bch2_io_clock_exit(&c->io_clock[READ]); |
| bch2_fs_compress_exit(c); |
| bch2_journal_keys_put_initial(c); |
| bch2_find_btree_nodes_exit(&c->found_btree_nodes); |
| BUG_ON(atomic_read(&c->journal_keys.ref)); |
| bch2_fs_btree_write_buffer_exit(c); |
| percpu_free_rwsem(&c->mark_lock); |
| free_percpu(c->online_reserved); |
| |
| darray_exit(&c->btree_roots_extra); |
| free_percpu(c->pcpu); |
| mempool_exit(&c->large_bkey_pool); |
| mempool_exit(&c->btree_bounce_pool); |
| bioset_exit(&c->btree_bio); |
| mempool_exit(&c->fill_iter); |
| #ifndef BCH_WRITE_REF_DEBUG |
| percpu_ref_exit(&c->writes); |
| #endif |
| kfree(rcu_dereference_protected(c->disk_groups, 1)); |
| kfree(c->journal_seq_blacklist_table); |
| kfree(c->unused_inode_hints); |
| |
| if (c->write_ref_wq) |
| destroy_workqueue(c->write_ref_wq); |
| if (c->io_complete_wq) |
| destroy_workqueue(c->io_complete_wq); |
| if (c->copygc_wq) |
| destroy_workqueue(c->copygc_wq); |
| if (c->btree_io_complete_wq) |
| destroy_workqueue(c->btree_io_complete_wq); |
| if (c->btree_update_wq) |
| destroy_workqueue(c->btree_update_wq); |
| |
| bch2_free_super(&c->disk_sb); |
| 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); |
| |
| cancel_work_sync(&c->journal_seq_blacklist_gc_work); |
| |
| down_write(&c->state_lock); |
| bch2_fs_read_only(c); |
| up_write(&c->state_lock); |
| |
| for_each_member_device(c, ca) |
| 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); |
| |
| 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) |
| { |
| unsigned i; |
| |
| mutex_lock(&bch_fs_list_lock); |
| list_del(&c->list); |
| mutex_unlock(&bch_fs_list_lock); |
| |
| closure_sync(&c->cl); |
| closure_debug_destroy(&c->cl); |
| |
| for (i = 0; i < c->sb.nr_devices; i++) { |
| struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true); |
| |
| if (ca) { |
| bch2_free_super(&ca->disk_sb); |
| bch2_dev_free(ca); |
| } |
| } |
| |
| bch_verbose(c, "shutdown complete"); |
| |
| kobject_put(&c->kobj); |
| } |
| |
| void bch2_fs_stop(struct bch_fs *c) |
| { |
| __bch2_fs_stop(c); |
| bch2_fs_free(c); |
| } |
| |
| static int bch2_fs_online(struct bch_fs *c) |
| { |
| int ret = 0; |
| |
| lockdep_assert_held(&bch_fs_list_lock); |
| |
| if (__bch2_uuid_to_fs(c->sb.uuid)) { |
| bch_err(c, "filesystem UUID already open"); |
| return -EINVAL; |
| } |
| |
| ret = bch2_fs_chardev_init(c); |
| if (ret) { |
| bch_err(c, "error creating character device"); |
| return ret; |
| } |
| |
| bch2_fs_debug_init(c); |
| |
| ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?: |
| kobject_add(&c->internal, &c->kobj, "internal") ?: |
| kobject_add(&c->opts_dir, &c->kobj, "options") ?: |
| #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); |
| 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"); |
| percpu_ref_put(&ca->ref); |
| goto err; |
| } |
| } |
| |
| BUG_ON(!list_empty(&c->list)); |
| list_add(&c->list, &bch_fs_list); |
| err: |
| up_write(&c->state_lock); |
| return ret; |
| } |
| |
| static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts) |
| { |
| struct bch_fs *c; |
| struct printbuf name = PRINTBUF; |
| unsigned i, iter_size; |
| int ret = 0; |
| |
| c = 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); |
| sema_init(&c->online_fsck_mutex, 1); |
| |
| init_rwsem(&c->gc_lock); |
| mutex_init(&c->gc_gens_lock); |
| atomic_set(&c->journal_keys.ref, 1); |
| c->journal_keys.initial_ref_held = true; |
| |
| for (i = 0; i < BCH_TIME_STAT_NR; i++) |
| bch2_time_stats_init(&c->times[i]); |
| |
| bch2_fs_copygc_init(c); |
| bch2_fs_btree_key_cache_init_early(&c->btree_key_cache); |
| bch2_fs_btree_iter_init_early(c); |
| bch2_fs_btree_interior_update_init_early(c); |
| bch2_fs_allocator_background_init(c); |
| bch2_fs_allocator_foreground_init(c); |
| bch2_fs_rebalance_init(c); |
| bch2_fs_quota_init(c); |
| bch2_fs_ec_init_early(c); |
| bch2_fs_move_init(c); |
| bch2_fs_sb_errors_init_early(c); |
| |
| INIT_LIST_HEAD(&c->list); |
| |
| mutex_init(&c->usage_scratch_lock); |
| |
| mutex_init(&c->bio_bounce_pages_lock); |
| mutex_init(&c->snapshot_table_lock); |
| init_rwsem(&c->snapshot_create_lock); |
| |
| spin_lock_init(&c->btree_write_error_lock); |
| |
| INIT_WORK(&c->journal_seq_blacklist_gc_work, |
| bch2_blacklist_entries_gc); |
| |
| INIT_LIST_HEAD(&c->journal_iters); |
| |
| INIT_LIST_HEAD(&c->fsck_error_msgs); |
| mutex_init(&c->fsck_error_msgs_lock); |
| |
| seqcount_init(&c->gc_pos_lock); |
| |
| seqcount_init(&c->usage_lock); |
| |
| sema_init(&c->io_in_flight, 128); |
| |
| INIT_LIST_HEAD(&c->vfs_inodes_list); |
| mutex_init(&c->vfs_inodes_lock); |
| |
| c->copy_gc_enabled = 1; |
| c->rebalance.enabled = 1; |
| c->promote_whole_extents = true; |
| |
| c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write]; |
| c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write]; |
| c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq]; |
| |
| bch2_fs_btree_cache_init_early(&c->btree_cache); |
| |
| mutex_init(&c->sectors_available_lock); |
| |
| ret = percpu_init_rwsem(&c->mark_lock); |
| if (ret) |
| goto err; |
| |
| mutex_lock(&c->sb_lock); |
| ret = bch2_sb_to_fs(c, sb); |
| mutex_unlock(&c->sb_lock); |
| |
| if (ret) |
| goto err; |
| |
| pr_uuid(&name, c->sb.user_uuid.b); |
| 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); |
| |
| /* Compat: */ |
| if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && |
| !BCH_SB_JOURNAL_FLUSH_DELAY(sb)) |
| SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); |
| |
| if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && |
| !BCH_SB_JOURNAL_RECLAIM_DELAY(sb)) |
| SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100); |
| |
| c->opts = bch2_opts_default; |
| ret = bch2_opts_from_sb(&c->opts, sb); |
| if (ret) |
| goto err; |
| |
| bch2_opts_apply(&c->opts, opts); |
| |
| c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc; |
| if (c->opts.inodes_use_key_cache) |
| c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes; |
| c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops; |
| |
| c->block_bits = ilog2(block_sectors(c)); |
| c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c); |
| |
| if (bch2_fs_init_fault("fs_alloc")) { |
| bch_err(c, "fs_alloc fault injected"); |
| ret = -EFAULT; |
| goto err; |
| } |
| |
| iter_size = sizeof(struct sort_iter) + |
| (btree_blocks(c) + 1) * 2 * |
| sizeof(struct sort_iter_set); |
| |
| c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus())); |
| |
| if (!(c->btree_update_wq = alloc_workqueue("bcachefs", |
| WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_UNBOUND, 512)) || |
| !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io", |
| 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->io_complete_wq = alloc_workqueue("bcachefs_io", |
| WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 512)) || |
| !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref", |
| WQ_FREEZABLE, 0)) || |
| #ifndef BCH_WRITE_REF_DEBUG |
| percpu_ref_init(&c->writes, bch2_writes_disabled, |
| PERCPU_REF_INIT_DEAD, GFP_KERNEL) || |
| #endif |
| mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) || |
| bioset_init(&c->btree_bio, 1, |
| max(offsetof(struct btree_read_bio, bio), |
| offsetof(struct btree_write_bio, wbio.bio)), |
| BIOSET_NEED_BVECS) || |
| !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) || |
| !(c->online_reserved = alloc_percpu(u64)) || |
| mempool_init_kvmalloc_pool(&c->btree_bounce_pool, 1, |
| c->opts.btree_node_size) || |
| mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) || |
| !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits, |
| sizeof(u64), GFP_KERNEL))) { |
| ret = -BCH_ERR_ENOMEM_fs_other_alloc; |
| goto err; |
| } |
| |
| ret = bch2_fs_counters_init(c) ?: |
| bch2_fs_sb_errors_init(c) ?: |
| bch2_io_clock_init(&c->io_clock[READ]) ?: |
| bch2_io_clock_init(&c->io_clock[WRITE]) ?: |
| bch2_fs_journal_init(&c->journal) ?: |
| bch2_fs_replicas_init(c) ?: |
| bch2_fs_btree_cache_init(c) ?: |
| bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?: |
| bch2_fs_btree_iter_init(c) ?: |
| bch2_fs_btree_interior_update_init(c) ?: |
| bch2_fs_buckets_waiting_for_journal_init(c) ?: |
| bch2_fs_btree_write_buffer_init(c) ?: |
| bch2_fs_subvolumes_init(c) ?: |
| bch2_fs_io_read_init(c) ?: |
| bch2_fs_io_write_init(c) ?: |
| bch2_fs_nocow_locking_init(c) ?: |
| bch2_fs_encryption_init(c) ?: |
| bch2_fs_compress_init(c) ?: |
| bch2_fs_ec_init(c) ?: |
| bch2_fs_fsio_init(c) ?: |
| bch2_fs_fs_io_buffered_init(c) ?: |
| bch2_fs_fs_io_direct_init(c); |
| if (ret) |
| goto err; |
| |
| for (i = 0; i < c->sb.nr_devices; i++) |
| if (bch2_dev_exists(c->disk_sb.sb, i) && |
| bch2_dev_alloc(c, i)) { |
| ret = -EEXIST; |
| goto err; |
| } |
| |
| bch2_journal_entry_res_resize(&c->journal, |
| &c->btree_root_journal_res, |
| BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX)); |
| bch2_dev_usage_journal_reserve(c); |
| bch2_journal_entry_res_resize(&c->journal, |
| &c->clock_journal_res, |
| (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2); |
| |
| mutex_lock(&bch_fs_list_lock); |
| ret = bch2_fs_online(c); |
| mutex_unlock(&bch_fs_list_lock); |
| |
| if (ret) |
| goto err; |
| out: |
| return c; |
| err: |
| bch2_fs_free(c); |
| c = ERR_PTR(ret); |
| goto out; |
| } |
| |
| noinline_for_stack |
| static void print_mount_opts(struct bch_fs *c) |
| { |
| enum bch_opt_id i; |
| struct printbuf p = PRINTBUF; |
| bool first = true; |
| |
| prt_str(&p, "mounting version "); |
| bch2_version_to_text(&p, c->sb.version); |
| |
| if (c->opts.read_only) { |
| prt_str(&p, " opts="); |
| first = false; |
| prt_printf(&p, "ro"); |
| } |
| |
| for (i = 0; i < bch2_opts_nr; i++) { |
| const struct bch_option *opt = &bch2_opt_table[i]; |
| u64 v = bch2_opt_get_by_id(&c->opts, i); |
| |
| if (!(opt->flags & OPT_MOUNT)) |
| continue; |
| |
| if (v == bch2_opt_get_by_id(&bch2_opts_default, i)) |
| continue; |
| |
| prt_str(&p, first ? " opts=" : ","); |
| first = false; |
| bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE); |
| } |
| |
| bch_info(c, "%s", p.buf); |
| printbuf_exit(&p); |
| } |
| |
| int bch2_fs_start(struct bch_fs *c) |
| { |
| time64_t now = ktime_get_real_seconds(); |
| int ret; |
| |
| print_mount_opts(c); |
| |
| down_write(&c->state_lock); |
| |
| BUG_ON(test_bit(BCH_FS_started, &c->flags)); |
| |
| mutex_lock(&c->sb_lock); |
| |
| ret = bch2_sb_members_v2_init(c); |
| if (ret) { |
| mutex_unlock(&c->sb_lock); |
| goto err; |
| } |
| |
| for_each_online_member(c, ca) |
| bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = cpu_to_le64(now); |
| |
| struct bch_sb_field_ext *ext = |
| bch2_sb_field_get_minsize(&c->disk_sb, ext, sizeof(*ext) / sizeof(u64)); |
| mutex_unlock(&c->sb_lock); |
| |
| if (!ext) { |
| bch_err(c, "insufficient space in superblock for sb_field_ext"); |
| ret = -BCH_ERR_ENOSPC_sb; |
| goto err; |
| } |
| |
| for_each_rw_member(c, ca) |
| bch2_dev_allocator_add(c, ca); |
| bch2_recalc_capacity(c); |
| |
| ret = BCH_SB_INITIALIZED(c->disk_sb.sb) |
| ? bch2_fs_recovery(c) |
| : bch2_fs_initialize(c); |
| if (ret) |
| goto err; |
| |
| ret = bch2_opts_check_may_set(c); |
| if (ret) |
| goto err; |
| |
| if (bch2_fs_init_fault("fs_start")) { |
| bch_err(c, "fs_start fault injected"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| set_bit(BCH_FS_started, &c->flags); |
| |
| if (c->opts.read_only) { |
| bch2_fs_read_only(c); |
| } else { |
| ret = !test_bit(BCH_FS_rw, &c->flags) |
| ? bch2_fs_read_write(c) |
| : bch2_fs_read_write_late(c); |
| if (ret) |
| goto err; |
| } |
| |
| ret = 0; |
| err: |
| if (ret) |
| bch_err_msg(c, ret, "starting filesystem"); |
| else |
| bch_verbose(c, "done starting filesystem"); |
| up_write(&c->state_lock); |
| 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_mismatched_block_size; |
| |
| if (le16_to_cpu(m.bucket_size) < |
| BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb)) |
| return -BCH_ERR_bucket_size_too_small; |
| |
| return 0; |
| } |
| |
| static int bch2_dev_in_fs(struct bch_sb_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_dev_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_release(struct kobject *kobj) |
| { |
| struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj); |
| |
| kfree(ca); |
| } |
| |
| static void bch2_dev_free(struct bch_dev *ca) |
| { |
| cancel_work_sync(&ca->io_error_work); |
| |
| if (ca->kobj.state_in_sysfs && |
| ca->disk_sb.bdev) |
| sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); |
| |
| if (ca->kobj.state_in_sysfs) |
| kobject_del(&ca->kobj); |
| |
| bch2_free_super(&ca->disk_sb); |
| bch2_dev_journal_exit(ca); |
| |
| free_percpu(ca->io_done); |
| bioset_exit(&ca->replica_set); |
| bch2_dev_buckets_free(ca); |
| free_page((unsigned long) ca->sb_read_scratch); |
| |
| bch2_time_stats_quantiles_exit(&ca->io_latency[WRITE]); |
| bch2_time_stats_quantiles_exit(&ca->io_latency[READ]); |
| |
| percpu_ref_exit(&ca->io_ref); |
| percpu_ref_exit(&ca->ref); |
| kobject_put(&ca->kobj); |
| } |
| |
| static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca) |
| { |
| |
| lockdep_assert_held(&c->state_lock); |
| |
| if (percpu_ref_is_zero(&ca->io_ref)) |
| return; |
| |
| __bch2_dev_read_only(c, ca); |
| |
| reinit_completion(&ca->io_ref_completion); |
| percpu_ref_kill(&ca->io_ref); |
| wait_for_completion(&ca->io_ref_completion); |
| |
| if (ca->kobj.state_in_sysfs) { |
| sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs"); |
| sysfs_remove_link(&ca->kobj, "block"); |
| } |
| |
| bch2_free_super(&ca->disk_sb); |
| bch2_dev_journal_exit(ca); |
| } |
| |
| static void bch2_dev_ref_complete(struct percpu_ref *ref) |
| { |
| struct bch_dev *ca = container_of(ref, struct bch_dev, ref); |
| |
| complete(&ca->ref_completion); |
| } |
| |
| static void bch2_dev_io_ref_complete(struct percpu_ref *ref) |
| { |
| struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref); |
| |
| complete(&ca->io_ref_completion); |
| } |
| |
| static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca) |
| { |
| int ret; |
| |
| if (!c->kobj.state_in_sysfs) |
| return 0; |
| |
| if (!ca->kobj.state_in_sysfs) { |
| ret = kobject_add(&ca->kobj, &c->kobj, |
| "dev-%u", ca->dev_idx); |
| if (ret) |
| return ret; |
| } |
| |
| if (ca->disk_sb.bdev) { |
| struct kobject *block = bdev_kobj(ca->disk_sb.bdev); |
| |
| ret = sysfs_create_link(block, &ca->kobj, "bcachefs"); |
| if (ret) |
| return ret; |
| |
| ret = sysfs_create_link(&ca->kobj, block, "block"); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c, |
| struct bch_member *member) |
| { |
| struct bch_dev *ca; |
| unsigned i; |
| |
| ca = kzalloc(sizeof(*ca), GFP_KERNEL); |
| if (!ca) |
| return NULL; |
| |
| kobject_init(&ca->kobj, &bch2_dev_ktype); |
| init_completion(&ca->ref_completion); |
| init_completion(&ca->io_ref_completion); |
| |
| init_rwsem(&ca->bucket_lock); |
| |
| INIT_WORK(&ca->io_error_work, bch2_io_error_work); |
| |
| bch2_time_stats_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)); |
| |
| if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, |
| 0, GFP_KERNEL) || |
| percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete, |
| PERCPU_REF_INIT_DEAD, GFP_KERNEL) || |
| !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) || |
| bch2_dev_buckets_alloc(c, ca) || |
| bioset_init(&ca->replica_set, 4, |
| offsetof(struct bch_write_bio, bio), 0) || |
| !(ca->io_done = alloc_percpu(*ca->io_done))) |
| goto err; |
| |
| return ca; |
| err: |
| bch2_dev_free(ca); |
| return NULL; |
| } |
| |
| static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca, |
| unsigned dev_idx) |
| { |
| ca->dev_idx = dev_idx; |
| __set_bit(ca->dev_idx, ca->self.d); |
| scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx); |
| |
| ca->fs = c; |
| rcu_assign_pointer(c->devs[ca->dev_idx], ca); |
| |
| if (bch2_dev_sysfs_online(c, ca)) |
| pr_warn("error creating sysfs objects"); |
| } |
| |
| static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx) |
| { |
| struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx); |
| struct bch_dev *ca = NULL; |
| int ret = 0; |
| |
| if (bch2_fs_init_fault("dev_alloc")) |
| goto err; |
| |
| ca = __bch2_dev_alloc(c, &member); |
| if (!ca) |
| goto err; |
| |
| ca->fs = c; |
| |
| bch2_dev_attach(c, ca, dev_idx); |
| return ret; |
| err: |
| if (ca) |
| bch2_dev_free(ca); |
| return -BCH_ERR_ENOMEM_dev_alloc; |
| } |
| |
| static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb) |
| { |
| unsigned ret; |
| |
| if (bch2_dev_is_online(ca)) { |
| bch_err(ca, "already have device online in slot %u", |
| sb->sb->dev_idx); |
| return -BCH_ERR_device_already_online; |
| } |
| |
| if (get_capacity(sb->bdev->bd_disk) < |
| ca->mi.bucket_size * ca->mi.nbuckets) { |
| bch_err(ca, "cannot online: device too small"); |
| return -BCH_ERR_device_size_too_small; |
| } |
| |
| BUG_ON(!percpu_ref_is_zero(&ca->io_ref)); |
| |
| ret = bch2_dev_journal_init(ca, sb->sb); |
| if (ret) |
| return ret; |
| |
| /* Commit: */ |
| ca->disk_sb = *sb; |
| memset(sb, 0, sizeof(*sb)); |
| |
| ca->dev = ca->disk_sb.bdev->bd_dev; |
| |
| percpu_ref_reinit(&ca->io_ref); |
| |
| return 0; |
| } |
| |
| static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb) |
| { |
| struct bch_dev *ca; |
| int ret; |
| |
| lockdep_assert_held(&c->state_lock); |
| |
| if (le64_to_cpu(sb->sb->seq) > |
| le64_to_cpu(c->disk_sb.sb->seq)) |
| bch2_sb_to_fs(c, sb->sb); |
| |
| BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices || |
| !c->devs[sb->sb->dev_idx]); |
| |
| ca = bch_dev_locked(c, sb->sb->dev_idx); |
| |
| ret = __bch2_dev_attach_bdev(ca, sb); |
| if (ret) |
| return ret; |
| |
| bch2_dev_sysfs_online(c, ca); |
| |
| struct printbuf name = PRINTBUF; |
| prt_bdevname(&name, ca->disk_sb.bdev); |
| |
| if (c->sb.nr_devices == 1) |
| strscpy(c->name, name.buf, sizeof(c->name)); |
| strscpy(ca->name, name.buf, sizeof(ca->name)); |
| |
| printbuf_exit(&name); |
| |
| rebalance_wakeup(c); |
| return 0; |
| } |
| |
| /* Device management: */ |
| |
| /* |
| * Note: this function is also used by the error paths - when a particular |
| * device sees an error, we call it to determine whether we can just set the |
| * device RO, or - if this function returns false - we'll set the whole |
| * filesystem RO: |
| * |
| * XXX: maybe we should be more explicit about whether we're changing state |
| * because we got an error or what have you? |
| */ |
| bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca, |
| enum bch_member_state new_state, int flags) |
| { |
| struct bch_devs_mask new_online_devs; |
| 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 = bch2_online_devs(c); |
| __clear_bit(ca->dev_idx, new_online_devs.d); |
| |
| return bch2_have_enough_devs(c, new_online_devs, flags, false); |
| default: |
| BUG(); |
| } |
| } |
| |
| static bool bch2_fs_may_start(struct bch_fs *c) |
| { |
| struct bch_dev *ca; |
| unsigned i, flags = 0; |
| |
| if (c->opts.very_degraded) |
| flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST; |
| |
| if (c->opts.degraded) |
| flags |= BCH_FORCE_IF_DEGRADED; |
| |
| if (!c->opts.degraded && |
| !c->opts.very_degraded) { |
| mutex_lock(&c->sb_lock); |
| |
| for (i = 0; i < c->disk_sb.sb->nr_devices; i++) { |
| if (!bch2_dev_exists(c->disk_sb.sb, i)) |
| continue; |
| |
| ca = bch_dev_locked(c, i); |
| |
| if (!bch2_dev_is_online(ca) && |
| (ca->mi.state == BCH_MEMBER_STATE_rw || |
| ca->mi.state == BCH_MEMBER_STATE_ro)) { |
| mutex_unlock(&c->sb_lock); |
| return false; |
| } |
| } |
| mutex_unlock(&c->sb_lock); |
| } |
| |
| return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true); |
| } |
| |
| static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca) |
| { |
| /* |
| * The allocator thread itself allocates btree nodes, so stop it first: |
| */ |
| bch2_dev_allocator_remove(c, ca); |
| bch2_dev_journal_stop(&c->journal, ca); |
| } |
| |
| static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca) |
| { |
| lockdep_assert_held(&c->state_lock); |
| |
| BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw); |
| |
| bch2_dev_allocator_add(c, ca); |
| bch2_recalc_capacity(c); |
| } |
| |
| int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, |
| enum bch_member_state new_state, int flags) |
| { |
| struct bch_member *m; |
| int ret = 0; |
| |
| if (ca->mi.state == new_state) |
| return 0; |
| |
| if (!bch2_dev_state_allowed(c, ca, new_state, flags)) |
| return -BCH_ERR_device_state_not_allowed; |
| |
| if (new_state != BCH_MEMBER_STATE_rw) |
| __bch2_dev_read_only(c, ca); |
| |
| bch_notice(ca, "%s", bch2_member_states[new_state]); |
| |
| mutex_lock(&c->sb_lock); |
| m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx); |
| SET_BCH_MEMBER_STATE(m, new_state); |
| bch2_write_super(c); |
| mutex_unlock(&c->sb_lock); |
| |
| if (new_state == BCH_MEMBER_STATE_rw) |
| __bch2_dev_read_write(c, ca); |
| |
| rebalance_wakeup(c); |
| |
| return ret; |
| } |
| |
| int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca, |
| enum bch_member_state new_state, int flags) |
| { |
| int ret; |
| |
| down_write(&c->state_lock); |
| ret = __bch2_dev_set_state(c, ca, new_state, flags); |
| up_write(&c->state_lock); |
| |
| return ret; |
| } |
| |
| /* Device add/removal: */ |
| |
| static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca) |
| { |
| struct bpos start = POS(ca->dev_idx, 0); |
| struct bpos end = POS(ca->dev_idx, U64_MAX); |
| int ret; |
| |
| /* |
| * We clear the LRU and need_discard btrees first so that we don't race |
| * with bch2_do_invalidates() and bch2_do_discards() |
| */ |
| ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end, |
| BTREE_TRIGGER_norun, NULL) ?: |
| bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end, |
| BTREE_TRIGGER_norun, NULL) ?: |
| bch2_btree_delete_range(c, BTREE_ID_freespace, start, end, |
| BTREE_TRIGGER_norun, NULL) ?: |
| bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end, |
| BTREE_TRIGGER_norun, NULL) ?: |
| bch2_btree_delete_range(c, BTREE_ID_alloc, start, end, |
| BTREE_TRIGGER_norun, NULL) ?: |
| bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end, |
| BTREE_TRIGGER_norun, NULL); |
| bch_err_msg(c, ret, "removing dev alloc info"); |
| return ret; |
| } |
| |
| int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags) |
| { |
| struct bch_member *m; |
| unsigned dev_idx = ca->dev_idx, data; |
| int ret; |
| |
| down_write(&c->state_lock); |
| |
| /* |
| * We consume a reference to ca->ref, regardless of whether we succeed |
| * or fail: |
| */ |
| percpu_ref_put(&ca->ref); |
| |
| if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { |
| bch_err(ca, "Cannot remove without losing data"); |
| ret = -BCH_ERR_device_state_not_allowed; |
| goto err; |
| } |
| |
| __bch2_dev_read_only(c, ca); |
| |
| ret = bch2_dev_data_drop(c, ca->dev_idx, flags); |
| bch_err_msg(ca, ret, "bch2_dev_data_drop()"); |
| if (ret) |
| goto err; |
| |
| ret = bch2_dev_remove_alloc(c, ca); |
| bch_err_msg(ca, ret, "bch2_dev_remove_alloc()"); |
| if (ret) |
| goto err; |
| |
| 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); |
| |
| percpu_ref_kill(&ca->ref); |
| wait_for_completion(&ca->ref_completion); |
| |
| bch2_dev_free(ca); |
| |
| /* |
| * At this point the device object has been removed in-core, but the |
| * on-disk journal might still refer to the device index via sb device |
| * usage entries. Recovery fails if it sees usage information for an |
| * invalid device. Flush journal pins to push the back of the journal |
| * past now invalid device index references before we update the |
| * superblock, but after the device object has been removed so any |
| * further journal writes elide usage info for the device. |
| */ |
| bch2_journal_flush_all_pins(&c->journal); |
| |
| /* |
| * Free this device's slot in the bch_member array - all pointers to |
| * this device must be gone: |
| */ |
| mutex_lock(&c->sb_lock); |
| m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); |
| memset(&m->uuid, 0, sizeof(m->uuid)); |
| |
| bch2_write_super(c); |
| |
| mutex_unlock(&c->sb_lock); |
| up_write(&c->state_lock); |
| |
| bch2_dev_usage_journal_reserve(c); |
| return 0; |
| err: |
| if (ca->mi.state == BCH_MEMBER_STATE_rw && |
| !percpu_ref_is_zero(&ca->io_ref)) |
| __bch2_dev_read_write(c, ca); |
| up_write(&c->state_lock); |
| return ret; |
| } |
| |
| /* Add new device to running filesystem: */ |
| int bch2_dev_add(struct bch_fs *c, const char *path) |
| { |
| struct bch_opts opts = bch2_opts_empty(); |
| struct bch_sb_handle sb; |
| struct bch_dev *ca = NULL; |
| struct bch_sb_field_members_v2 *mi; |
| struct bch_member dev_mi; |
| unsigned dev_idx, nr_devices, u64s; |
| struct printbuf errbuf = PRINTBUF; |
| struct printbuf label = PRINTBUF; |
| int ret; |
| |
| ret = bch2_read_super(path, &opts, &sb); |
| bch_err_msg(c, ret, "reading super"); |
| if (ret) |
| goto err; |
| |
| dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx); |
| |
| if (BCH_MEMBER_GROUP(&dev_mi)) { |
| bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1); |
| if (label.allocation_failure) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| } |
| |
| ret = bch2_dev_may_add(sb.sb, c); |
| if (ret) |
| goto err; |
| |
| ca = __bch2_dev_alloc(c, &dev_mi); |
| if (!ca) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| bch2_dev_usage_init(ca); |
| |
| ret = __bch2_dev_attach_bdev(ca, &sb); |
| if (ret) |
| goto err; |
| |
| ret = bch2_dev_journal_alloc(ca); |
| bch_err_msg(c, ret, "allocating journal"); |
| if (ret) |
| goto err; |
| |
| down_write(&c->state_lock); |
| mutex_lock(&c->sb_lock); |
| |
| 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 no_slot; |
| |
| for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) |
| if (!bch2_dev_exists(c->disk_sb.sb, dev_idx)) |
| goto have_slot; |
| no_slot: |
| ret = -BCH_ERR_ENOSPC_sb_members; |
| bch_err_msg(c, ret, "setting up new superblock"); |
| goto err_unlock; |
| |
| have_slot: |
| nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices); |
| |
| mi = bch2_sb_field_get(c->disk_sb.sb, members_v2); |
| u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) + |
| le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64)); |
| |
| mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s); |
| if (!mi) { |
| ret = -BCH_ERR_ENOSPC_sb_members; |
| bch_err_msg(c, ret, "setting up new superblock"); |
| goto err_unlock; |
| } |
| struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx); |
| |
| /* success: */ |
| |
| *m = dev_mi; |
| m->last_mount = cpu_to_le64(ktime_get_real_seconds()); |
| c->disk_sb.sb->nr_devices = nr_devices; |
| |
| ca->disk_sb.sb->dev_idx = dev_idx; |
| bch2_dev_attach(c, ca, dev_idx); |
| |
| if (BCH_MEMBER_GROUP(&dev_mi)) { |
| ret = __bch2_dev_group_set(c, ca, label.buf); |
| bch_err_msg(c, ret, "creating new label"); |
| if (ret) |
| goto err_unlock; |
| } |
| |
| bch2_write_super(c); |
| mutex_unlock(&c->sb_lock); |
| |
| bch2_dev_usage_journal_reserve(c); |
| |
| ret = bch2_trans_mark_dev_sb(c, ca, 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; |
| |
| ca->new_fs_bucket_idx = 0; |
| |
| if (ca->mi.state == BCH_MEMBER_STATE_rw) |
| __bch2_dev_read_write(c, ca); |
| |
| up_write(&c->state_lock); |
| return 0; |
| |
| err_unlock: |
| mutex_unlock(&c->sb_lock); |
| up_write(&c->state_lock); |
| err: |
| if (ca) |
| bch2_dev_free(ca); |
| bch2_free_super(&sb); |
| printbuf_exit(&label); |
| printbuf_exit(&errbuf); |
| bch_err_fn(c, ret); |
| return ret; |
| err_late: |
| up_write(&c->state_lock); |
| ca = NULL; |
| goto err; |
| } |
| |
| /* Hot add existing device to running filesystem: */ |
| int bch2_dev_online(struct bch_fs *c, const char *path) |
| { |
| struct bch_opts opts = bch2_opts_empty(); |
| struct bch_sb_handle sb = { NULL }; |
| struct bch_dev *ca; |
| unsigned dev_idx; |
| int ret; |
| |
| down_write(&c->state_lock); |
| |
| ret = bch2_read_super(path, &opts, &sb); |
| if (ret) { |
| up_write(&c->state_lock); |
| return ret; |
| } |
| |
| dev_idx = sb.sb->dev_idx; |
| |
| ret = bch2_dev_in_fs(&c->disk_sb, &sb, &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 = bch_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); |
| bch_err_msg(ca, ret, "allocating journal"); |
| if (ret) |
| goto err; |
| } |
| |
| mutex_lock(&c->sb_lock); |
| bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = |
| cpu_to_le64(ktime_get_real_seconds()); |
| bch2_write_super(c); |
| mutex_unlock(&c->sb_lock); |
| |
| up_write(&c->state_lock); |
| return 0; |
| err: |
| up_write(&c->state_lock); |
| bch2_free_super(&sb); |
| return ret; |
| } |
| |
| int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags) |
| { |
| down_write(&c->state_lock); |
| |
| if (!bch2_dev_is_online(ca)) { |
| bch_err(ca, "Already offline"); |
| up_write(&c->state_lock); |
| return 0; |
| } |
| |
| if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) { |
| bch_err(ca, "Cannot offline required disk"); |
| up_write(&c->state_lock); |
| return -BCH_ERR_device_state_not_allowed; |
| } |
| |
| __bch2_dev_offline(c, ca); |
| |
| up_write(&c->state_lock); |
| return 0; |
| } |
| |
| int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets) |
| { |
| struct bch_member *m; |
| u64 old_nbuckets; |
| int ret = 0; |
| |
| down_write(&c->state_lock); |
| old_nbuckets = ca->mi.nbuckets; |
| |
| if (nbuckets < ca->mi.nbuckets) { |
| bch_err(ca, "Cannot shrink yet"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| if (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_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_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_freespace_init(c, ca, old_nbuckets, nbuckets); |
| if (ret) |
| goto err; |
| |
| /* |
| * XXX: this is all wrong transactionally - we'll be able to do |
| * this correctly after the disk space accounting rewrite |
| */ |
| ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets; |
| } |
| |
| bch2_recalc_capacity(c); |
| err: |
| up_write(&c->state_lock); |
| return ret; |
| } |
| |
| /* return with ref on ca->ref: */ |
| struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name) |
| { |
| for_each_member_device(c, ca) |
| if (!strcmp(name, ca->name)) |
| return ca; |
| return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found); |
| } |
| |
| /* 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(char * const *devices, unsigned nr_devices, |
| struct bch_opts opts) |
| { |
| DARRAY(struct bch_sb_handle) sbs = { 0 }; |
| struct bch_fs *c = NULL; |
| struct bch_sb_handle *best = NULL; |
| struct printbuf errbuf = PRINTBUF; |
| int ret = 0; |
| |
| if (!try_module_get(THIS_MODULE)) |
| return ERR_PTR(-ENODEV); |
| |
| if (!nr_devices) { |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| ret = darray_make_room(&sbs, nr_devices); |
| if (ret) |
| goto err; |
| |
| for (unsigned i = 0; i < nr_devices; i++) { |
| struct bch_sb_handle sb = { NULL }; |
| |
| ret = bch2_read_super(devices[i], &opts, &sb); |
| if (ret) |
| goto err; |
| |
| BUG_ON(darray_push(&sbs, sb)); |
| } |
| |
| if (opts.nochanges && !opts.read_only) { |
| ret = -BCH_ERR_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); |
| ret = PTR_ERR_OR_ZERO(c); |
| if (ret) |
| goto err; |
| |
| down_write(&c->state_lock); |
| darray_for_each(sbs, sb) { |
| ret = bch2_dev_attach_bdev(c, sb); |
| if (ret) { |
| up_write(&c->state_lock); |
| goto err; |
| } |
| } |
| up_write(&c->state_lock); |
| |
| if (!bch2_fs_may_start(c)) { |
| ret = -BCH_ERR_insufficient_devices_to_start; |
| goto err_print; |
| } |
| |
| if (!c->opts.nostart) { |
| ret = bch2_fs_start(c); |
| if (ret) |
| goto err; |
| } |
| out: |
| darray_for_each(sbs, sb) |
| bch2_free_super(sb); |
| darray_exit(&sbs); |
| printbuf_exit(&errbuf); |
| module_put(THIS_MODULE); |
| return c; |
| err_print: |
| pr_err("bch_fs_open err opening %s: %s", |
| devices[0], bch2_err_str(ret)); |
| err: |
| if (!IS_ERR_OR_NULL(c)) |
| bch2_fs_stop(c); |
| c = ERR_PTR(ret); |
| goto out; |
| } |
| |
| /* Global interfaces/init */ |
| |
| static void bcachefs_exit(void) |
| { |
| bch2_debug_exit(); |
| bch2_vfs_exit(); |
| bch2_chardev_exit(); |
| bch2_btree_key_cache_exit(); |
| if (bcachefs_kset) |
| kset_unregister(bcachefs_kset); |
| } |
| |
| static int __init bcachefs_init(void) |
| { |
| bch2_bkey_pack_test(); |
| |
| if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) || |
| bch2_btree_key_cache_init() || |
| bch2_chardev_init() || |
| bch2_vfs_init() || |
| bch2_debug_init()) |
| goto err; |
| |
| return 0; |
| err: |
| bcachefs_exit(); |
| return -ENOMEM; |
| } |
| |
| #define BCH_DEBUG_PARAM(name, description) \ |
| bool bch2_##name; \ |
| module_param_named(name, bch2_##name, bool, 0644); \ |
| MODULE_PARM_DESC(name, description); |
| BCH_DEBUG_PARAMS() |
| #undef BCH_DEBUG_PARAM |
| |
| __maybe_unused |
| static unsigned bch2_metadata_version = bcachefs_metadata_version_current; |
| module_param_named(version, bch2_metadata_version, uint, 0400); |
| |
| module_exit(bcachefs_exit); |
| module_init(bcachefs_init); |