1 // SPDX-License-Identifier: GPL-2.0
3 * bcachefs setup/teardown code, and some metadata io - read a superblock and
4 * figure out what to do with it.
6 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
7 * Copyright 2012 Google, Inc.
11 #include "alloc_background.h"
12 #include "alloc_foreground.h"
13 #include "bkey_sort.h"
14 #include "btree_cache.h"
16 #include "btree_journal_iter.h"
17 #include "btree_key_cache.h"
18 #include "btree_update_interior.h"
20 #include "btree_write_buffer.h"
21 #include "buckets_waiting_for_journal.h"
28 #include "disk_groups.h"
34 #include "fs-io-buffered.h"
35 #include "fs-io-direct.h"
41 #include "journal_reclaim.h"
42 #include "journal_seq_blacklist.h"
46 #include "nocow_locking.h"
48 #include "rebalance.h"
52 #include "sb-errors.h"
53 #include "sb-members.h"
55 #include "subvolume.h"
61 #include <linux/backing-dev.h>
62 #include <linux/blkdev.h>
63 #include <linux/debugfs.h>
64 #include <linux/device.h>
65 #include <linux/idr.h>
66 #include <linux/module.h>
67 #include <linux/percpu.h>
68 #include <linux/random.h>
69 #include <linux/sysfs.h>
70 #include <crypto/hash.h>
72 MODULE_LICENSE("GPL");
73 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
74 MODULE_DESCRIPTION("bcachefs filesystem");
77 static const struct attribute_group type ## _group = { \
78 .attrs = type ## _files \
81 static const struct attribute_group *type ## _groups[] = { \
86 static const struct kobj_type type ## _ktype = { \
87 .release = type ## _release, \
88 .sysfs_ops = &type ## _sysfs_ops, \
89 .default_groups = type ## _groups \
92 static void bch2_fs_release(struct kobject *);
93 static void bch2_dev_release(struct kobject *);
94 static void bch2_fs_counters_release(struct kobject *k)
98 static void bch2_fs_internal_release(struct kobject *k)
102 static void bch2_fs_opts_dir_release(struct kobject *k)
106 static void bch2_fs_time_stats_release(struct kobject *k)
111 KTYPE(bch2_fs_counters);
112 KTYPE(bch2_fs_internal);
113 KTYPE(bch2_fs_opts_dir);
114 KTYPE(bch2_fs_time_stats);
117 static struct kset *bcachefs_kset;
118 static LIST_HEAD(bch_fs_list);
119 static DEFINE_MUTEX(bch_fs_list_lock);
121 DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);
123 static void bch2_dev_free(struct bch_dev *);
124 static int bch2_dev_alloc(struct bch_fs *, unsigned);
125 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
126 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
128 struct bch_fs *bch2_dev_to_fs(dev_t dev)
134 mutex_lock(&bch_fs_list_lock);
137 list_for_each_entry(c, &bch_fs_list, list)
138 for_each_member_device_rcu(ca, c, i, NULL)
139 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
146 mutex_unlock(&bch_fs_list_lock);
151 static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)
155 lockdep_assert_held(&bch_fs_list_lock);
157 list_for_each_entry(c, &bch_fs_list, list)
158 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))
164 struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)
168 mutex_lock(&bch_fs_list_lock);
169 c = __bch2_uuid_to_fs(uuid);
172 mutex_unlock(&bch_fs_list_lock);
177 static void bch2_dev_usage_journal_reserve(struct bch_fs *c)
180 unsigned i, nr = 0, u64s =
181 ((sizeof(struct jset_entry_dev_usage) +
182 sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) /
186 for_each_member_device_rcu(ca, c, i, NULL)
190 bch2_journal_entry_res_resize(&c->journal,
191 &c->dev_usage_journal_res, u64s * nr);
194 /* Filesystem RO/RW: */
197 * For startup/shutdown of RW stuff, the dependencies are:
199 * - foreground writes depend on copygc and rebalance (to free up space)
201 * - copygc and rebalance depend on mark and sweep gc (they actually probably
202 * don't because they either reserve ahead of time or don't block if
203 * allocations fail, but allocations can require mark and sweep gc to run
204 * because of generation number wraparound)
206 * - all of the above depends on the allocator threads
208 * - allocator depends on the journal (when it rewrites prios and gens)
211 static void __bch2_fs_read_only(struct bch_fs *c)
214 unsigned i, clean_passes = 0;
218 bch2_open_buckets_stop(c, NULL, true);
219 bch2_rebalance_stop(c);
221 bch2_gc_thread_stop(c);
224 bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",
225 journal_cur_seq(&c->journal));
230 if (bch2_btree_interior_updates_flush(c) ||
231 bch2_journal_flush_all_pins(&c->journal) ||
232 bch2_btree_flush_all_writes(c) ||
233 seq != atomic64_read(&c->journal.seq)) {
234 seq = atomic64_read(&c->journal.seq);
237 } while (clean_passes < 2);
239 bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu",
240 journal_cur_seq(&c->journal));
242 if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) &&
243 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
244 set_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
245 bch2_fs_journal_stop(&c->journal);
248 * After stopping journal:
250 for_each_member_device(ca, c, i)
251 bch2_dev_allocator_remove(c, ca);
254 #ifndef BCH_WRITE_REF_DEBUG
255 static void bch2_writes_disabled(struct percpu_ref *writes)
257 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
259 set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
260 wake_up(&bch2_read_only_wait);
264 void bch2_fs_read_only(struct bch_fs *c)
266 if (!test_bit(BCH_FS_RW, &c->flags)) {
267 bch2_journal_reclaim_stop(&c->journal);
271 BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
274 * Block new foreground-end write operations from starting - any new
275 * writes will return -EROFS:
277 set_bit(BCH_FS_GOING_RO, &c->flags);
278 #ifndef BCH_WRITE_REF_DEBUG
279 percpu_ref_kill(&c->writes);
281 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
282 bch2_write_ref_put(c, i);
286 * If we're not doing an emergency shutdown, we want to wait on
287 * outstanding writes to complete so they don't see spurious errors due
288 * to shutting down the allocator:
290 * If we are doing an emergency shutdown outstanding writes may
291 * hang until we shutdown the allocator so we don't want to wait
292 * on outstanding writes before shutting everything down - but
293 * we do need to wait on them before returning and signalling
294 * that going RO is complete:
296 wait_event(bch2_read_only_wait,
297 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
298 test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
300 __bch2_fs_read_only(c);
302 wait_event(bch2_read_only_wait,
303 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
305 clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
306 clear_bit(BCH_FS_GOING_RO, &c->flags);
308 if (!bch2_journal_error(&c->journal) &&
309 !test_bit(BCH_FS_ERROR, &c->flags) &&
310 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) &&
311 test_bit(BCH_FS_STARTED, &c->flags) &&
312 test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags) &&
313 !c->opts.norecovery) {
314 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal));
315 BUG_ON(atomic_read(&c->btree_cache.dirty));
316 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty));
317 BUG_ON(c->btree_write_buffer.state.nr);
319 bch_verbose(c, "marking filesystem clean");
320 bch2_fs_mark_clean(c);
323 clear_bit(BCH_FS_RW, &c->flags);
326 static void bch2_fs_read_only_work(struct work_struct *work)
329 container_of(work, struct bch_fs, read_only_work);
331 down_write(&c->state_lock);
332 bch2_fs_read_only(c);
333 up_write(&c->state_lock);
336 static void bch2_fs_read_only_async(struct bch_fs *c)
338 queue_work(system_long_wq, &c->read_only_work);
341 bool bch2_fs_emergency_read_only(struct bch_fs *c)
343 bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags);
345 bch2_journal_halt(&c->journal);
346 bch2_fs_read_only_async(c);
348 wake_up(&bch2_read_only_wait);
352 static int bch2_fs_read_write_late(struct bch_fs *c)
357 * Data move operations can't run until after check_snapshots has
358 * completed, and bch2_snapshot_is_ancestor() is available.
360 * Ideally we'd start copygc/rebalance earlier instead of waiting for
361 * all of recovery/fsck to complete:
363 ret = bch2_copygc_start(c);
365 bch_err(c, "error starting copygc thread");
369 ret = bch2_rebalance_start(c);
371 bch_err(c, "error starting rebalance thread");
378 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
384 if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) {
385 bch_err(c, "cannot go rw, unfixed btree errors");
386 return -BCH_ERR_erofs_unfixed_errors;
389 if (test_bit(BCH_FS_RW, &c->flags))
392 if (c->opts.norecovery)
393 return -BCH_ERR_erofs_norecovery;
396 * nochanges is used for fsck -n mode - we have to allow going rw
397 * during recovery for that to work:
399 if (c->opts.nochanges && (!early || c->opts.read_only))
400 return -BCH_ERR_erofs_nochanges;
402 bch_info(c, "going read-write");
404 ret = bch2_sb_members_v2_init(c);
408 ret = bch2_fs_mark_dirty(c);
412 clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
415 * First journal write must be a flush write: after a clean shutdown we
416 * don't read the journal, so the first journal write may end up
417 * overwriting whatever was there previously, and there must always be
418 * at least one non-flush write in the journal or recovery will fail:
420 set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags);
422 for_each_rw_member(ca, c, i)
423 bch2_dev_allocator_add(c, ca);
424 bch2_recalc_capacity(c);
426 ret = bch2_gc_thread_start(c);
428 bch_err(c, "error starting gc thread");
432 ret = bch2_journal_reclaim_start(&c->journal);
437 ret = bch2_fs_read_write_late(c);
442 #ifndef BCH_WRITE_REF_DEBUG
443 percpu_ref_reinit(&c->writes);
445 for (i = 0; i < BCH_WRITE_REF_NR; i++) {
446 BUG_ON(atomic_long_read(&c->writes[i]));
447 atomic_long_inc(&c->writes[i]);
450 set_bit(BCH_FS_RW, &c->flags);
451 set_bit(BCH_FS_WAS_RW, &c->flags);
454 bch2_do_invalidates(c);
455 bch2_do_stripe_deletes(c);
456 bch2_do_pending_node_rewrites(c);
459 __bch2_fs_read_only(c);
463 int bch2_fs_read_write(struct bch_fs *c)
465 return __bch2_fs_read_write(c, false);
468 int bch2_fs_read_write_early(struct bch_fs *c)
470 lockdep_assert_held(&c->state_lock);
472 return __bch2_fs_read_write(c, true);
475 /* Filesystem startup/shutdown: */
477 static void __bch2_fs_free(struct bch_fs *c)
481 for (i = 0; i < BCH_TIME_STAT_NR; i++)
482 bch2_time_stats_exit(&c->times[i]);
484 bch2_free_pending_node_rewrites(c);
485 bch2_fs_sb_errors_exit(c);
486 bch2_fs_counters_exit(c);
487 bch2_fs_snapshots_exit(c);
488 bch2_fs_quota_exit(c);
489 bch2_fs_fs_io_direct_exit(c);
490 bch2_fs_fs_io_buffered_exit(c);
491 bch2_fs_fsio_exit(c);
493 bch2_fs_encryption_exit(c);
494 bch2_fs_nocow_locking_exit(c);
495 bch2_fs_io_write_exit(c);
496 bch2_fs_io_read_exit(c);
497 bch2_fs_buckets_waiting_for_journal_exit(c);
498 bch2_fs_btree_interior_update_exit(c);
499 bch2_fs_btree_iter_exit(c);
500 bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
501 bch2_fs_btree_cache_exit(c);
502 bch2_fs_replicas_exit(c);
503 bch2_fs_journal_exit(&c->journal);
504 bch2_io_clock_exit(&c->io_clock[WRITE]);
505 bch2_io_clock_exit(&c->io_clock[READ]);
506 bch2_fs_compress_exit(c);
507 bch2_journal_keys_free(&c->journal_keys);
508 bch2_journal_entries_free(c);
509 bch2_fs_btree_write_buffer_exit(c);
510 percpu_free_rwsem(&c->mark_lock);
511 free_percpu(c->online_reserved);
513 darray_exit(&c->btree_roots_extra);
514 free_percpu(c->pcpu);
515 mempool_exit(&c->large_bkey_pool);
516 mempool_exit(&c->btree_bounce_pool);
517 bioset_exit(&c->btree_bio);
518 mempool_exit(&c->fill_iter);
519 #ifndef BCH_WRITE_REF_DEBUG
520 percpu_ref_exit(&c->writes);
522 kfree(rcu_dereference_protected(c->disk_groups, 1));
523 kfree(c->journal_seq_blacklist_table);
524 kfree(c->unused_inode_hints);
527 destroy_workqueue(c->write_ref_wq);
528 if (c->io_complete_wq)
529 destroy_workqueue(c->io_complete_wq);
531 destroy_workqueue(c->copygc_wq);
532 if (c->btree_io_complete_wq)
533 destroy_workqueue(c->btree_io_complete_wq);
534 if (c->btree_update_wq)
535 destroy_workqueue(c->btree_update_wq);
537 bch2_free_super(&c->disk_sb);
538 kvpfree(c, sizeof(*c));
539 module_put(THIS_MODULE);
542 static void bch2_fs_release(struct kobject *kobj)
544 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
549 void __bch2_fs_stop(struct bch_fs *c)
554 bch_verbose(c, "shutting down");
556 set_bit(BCH_FS_STOPPING, &c->flags);
558 cancel_work_sync(&c->journal_seq_blacklist_gc_work);
560 down_write(&c->state_lock);
561 bch2_fs_read_only(c);
562 up_write(&c->state_lock);
564 for_each_member_device(ca, c, i)
565 if (ca->kobj.state_in_sysfs &&
567 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
569 if (c->kobj.state_in_sysfs)
570 kobject_del(&c->kobj);
572 bch2_fs_debug_exit(c);
573 bch2_fs_chardev_exit(c);
575 kobject_put(&c->counters_kobj);
576 kobject_put(&c->time_stats);
577 kobject_put(&c->opts_dir);
578 kobject_put(&c->internal);
580 /* btree prefetch might have kicked off reads in the background: */
581 bch2_btree_flush_all_reads(c);
583 for_each_member_device(ca, c, i)
584 cancel_work_sync(&ca->io_error_work);
586 cancel_work_sync(&c->read_only_work);
589 void bch2_fs_free(struct bch_fs *c)
593 mutex_lock(&bch_fs_list_lock);
595 mutex_unlock(&bch_fs_list_lock);
597 closure_sync(&c->cl);
598 closure_debug_destroy(&c->cl);
600 for (i = 0; i < c->sb.nr_devices; i++) {
601 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true);
604 bch2_free_super(&ca->disk_sb);
609 bch_verbose(c, "shutdown complete");
611 kobject_put(&c->kobj);
614 void bch2_fs_stop(struct bch_fs *c)
620 static int bch2_fs_online(struct bch_fs *c)
626 lockdep_assert_held(&bch_fs_list_lock);
628 if (__bch2_uuid_to_fs(c->sb.uuid)) {
629 bch_err(c, "filesystem UUID already open");
633 ret = bch2_fs_chardev_init(c);
635 bch_err(c, "error creating character device");
639 bch2_fs_debug_init(c);
641 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
642 kobject_add(&c->internal, &c->kobj, "internal") ?:
643 kobject_add(&c->opts_dir, &c->kobj, "options") ?:
644 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
645 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
646 bch2_opts_create_sysfs_files(&c->opts_dir);
648 bch_err(c, "error creating sysfs objects");
652 down_write(&c->state_lock);
654 for_each_member_device(ca, c, i) {
655 ret = bch2_dev_sysfs_online(c, ca);
657 bch_err(c, "error creating sysfs objects");
658 percpu_ref_put(&ca->ref);
663 BUG_ON(!list_empty(&c->list));
664 list_add(&c->list, &bch_fs_list);
666 up_write(&c->state_lock);
670 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
673 struct printbuf name = PRINTBUF;
674 unsigned i, iter_size;
677 c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
679 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc);
683 __module_get(THIS_MODULE);
685 closure_init(&c->cl, NULL);
687 c->kobj.kset = bcachefs_kset;
688 kobject_init(&c->kobj, &bch2_fs_ktype);
689 kobject_init(&c->internal, &bch2_fs_internal_ktype);
690 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
691 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
692 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
695 c->disk_sb.fs_sb = true;
697 init_rwsem(&c->state_lock);
698 mutex_init(&c->sb_lock);
699 mutex_init(&c->replicas_gc_lock);
700 mutex_init(&c->btree_root_lock);
701 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
703 init_rwsem(&c->gc_lock);
704 mutex_init(&c->gc_gens_lock);
706 for (i = 0; i < BCH_TIME_STAT_NR; i++)
707 bch2_time_stats_init(&c->times[i]);
709 bch2_fs_copygc_init(c);
710 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
711 bch2_fs_btree_interior_update_init_early(c);
712 bch2_fs_allocator_background_init(c);
713 bch2_fs_allocator_foreground_init(c);
714 bch2_fs_rebalance_init(c);
715 bch2_fs_quota_init(c);
716 bch2_fs_ec_init_early(c);
717 bch2_fs_move_init(c);
718 bch2_fs_sb_errors_init_early(c);
720 INIT_LIST_HEAD(&c->list);
722 mutex_init(&c->usage_scratch_lock);
724 mutex_init(&c->bio_bounce_pages_lock);
725 mutex_init(&c->snapshot_table_lock);
726 init_rwsem(&c->snapshot_create_lock);
728 spin_lock_init(&c->btree_write_error_lock);
730 INIT_WORK(&c->journal_seq_blacklist_gc_work,
731 bch2_blacklist_entries_gc);
733 INIT_LIST_HEAD(&c->journal_iters);
735 INIT_LIST_HEAD(&c->fsck_error_msgs);
736 mutex_init(&c->fsck_error_msgs_lock);
738 seqcount_init(&c->gc_pos_lock);
740 seqcount_init(&c->usage_lock);
742 sema_init(&c->io_in_flight, 128);
744 INIT_LIST_HEAD(&c->vfs_inodes_list);
745 mutex_init(&c->vfs_inodes_lock);
747 c->copy_gc_enabled = 1;
748 c->rebalance.enabled = 1;
749 c->promote_whole_extents = true;
751 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write];
752 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write];
753 c->journal.blocked_time = &c->times[BCH_TIME_blocked_journal];
754 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
756 bch2_fs_btree_cache_init_early(&c->btree_cache);
758 mutex_init(&c->sectors_available_lock);
760 ret = percpu_init_rwsem(&c->mark_lock);
764 mutex_lock(&c->sb_lock);
765 ret = bch2_sb_to_fs(c, sb);
766 mutex_unlock(&c->sb_lock);
771 pr_uuid(&name, c->sb.user_uuid.b);
772 strscpy(c->name, name.buf, sizeof(c->name));
773 printbuf_exit(&name);
775 ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0;
780 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
781 !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
782 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
784 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
785 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
786 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
788 c->opts = bch2_opts_default;
789 ret = bch2_opts_from_sb(&c->opts, sb);
793 bch2_opts_apply(&c->opts, opts);
795 c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
796 if (c->opts.inodes_use_key_cache)
797 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
798 c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops;
800 c->block_bits = ilog2(block_sectors(c));
801 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
803 if (bch2_fs_init_fault("fs_alloc")) {
804 bch_err(c, "fs_alloc fault injected");
809 iter_size = sizeof(struct sort_iter) +
810 (btree_blocks(c) + 1) * 2 *
811 sizeof(struct sort_iter_set);
813 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
815 if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
816 WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) ||
817 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
818 WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
819 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
820 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
821 !(c->io_complete_wq = alloc_workqueue("bcachefs_io",
822 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) ||
823 !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref",
825 #ifndef BCH_WRITE_REF_DEBUG
826 percpu_ref_init(&c->writes, bch2_writes_disabled,
827 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
829 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
830 bioset_init(&c->btree_bio, 1,
831 max(offsetof(struct btree_read_bio, bio),
832 offsetof(struct btree_write_bio, wbio.bio)),
833 BIOSET_NEED_BVECS) ||
834 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
835 !(c->online_reserved = alloc_percpu(u64)) ||
836 mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
838 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
839 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
840 sizeof(u64), GFP_KERNEL))) {
841 ret = -BCH_ERR_ENOMEM_fs_other_alloc;
845 ret = bch2_fs_counters_init(c) ?:
846 bch2_fs_sb_errors_init(c) ?:
847 bch2_io_clock_init(&c->io_clock[READ]) ?:
848 bch2_io_clock_init(&c->io_clock[WRITE]) ?:
849 bch2_fs_journal_init(&c->journal) ?:
850 bch2_fs_replicas_init(c) ?:
851 bch2_fs_btree_cache_init(c) ?:
852 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
853 bch2_fs_btree_iter_init(c) ?:
854 bch2_fs_btree_interior_update_init(c) ?:
855 bch2_fs_buckets_waiting_for_journal_init(c) ?:
856 bch2_fs_btree_write_buffer_init(c) ?:
857 bch2_fs_subvolumes_init(c) ?:
858 bch2_fs_io_read_init(c) ?:
859 bch2_fs_io_write_init(c) ?:
860 bch2_fs_nocow_locking_init(c) ?:
861 bch2_fs_encryption_init(c) ?:
862 bch2_fs_compress_init(c) ?:
863 bch2_fs_ec_init(c) ?:
864 bch2_fs_fsio_init(c) ?:
865 bch2_fs_fs_io_buffered_init(c) ?:
866 bch2_fs_fs_io_direct_init(c);
870 for (i = 0; i < c->sb.nr_devices; i++)
871 if (bch2_dev_exists(c->disk_sb.sb, i) &&
872 bch2_dev_alloc(c, i)) {
877 bch2_journal_entry_res_resize(&c->journal,
878 &c->btree_root_journal_res,
879 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
880 bch2_dev_usage_journal_reserve(c);
881 bch2_journal_entry_res_resize(&c->journal,
882 &c->clock_journal_res,
883 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
885 mutex_lock(&bch_fs_list_lock);
886 ret = bch2_fs_online(c);
887 mutex_unlock(&bch_fs_list_lock);
900 static void print_mount_opts(struct bch_fs *c)
903 struct printbuf p = PRINTBUF;
906 prt_str(&p, "mounting version ");
907 bch2_version_to_text(&p, c->sb.version);
909 if (c->opts.read_only) {
910 prt_str(&p, " opts=");
912 prt_printf(&p, "ro");
915 for (i = 0; i < bch2_opts_nr; i++) {
916 const struct bch_option *opt = &bch2_opt_table[i];
917 u64 v = bch2_opt_get_by_id(&c->opts, i);
919 if (!(opt->flags & OPT_MOUNT))
922 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
925 prt_str(&p, first ? " opts=" : ",");
927 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);
930 bch_info(c, "%s", p.buf);
934 int bch2_fs_start(struct bch_fs *c)
937 time64_t now = ktime_get_real_seconds();
943 down_write(&c->state_lock);
945 BUG_ON(test_bit(BCH_FS_STARTED, &c->flags));
947 mutex_lock(&c->sb_lock);
949 ret = bch2_sb_members_v2_init(c);
951 mutex_unlock(&c->sb_lock);
955 for_each_online_member(ca, c, i)
956 bch2_members_v2_get_mut(c->disk_sb.sb, i)->last_mount = cpu_to_le64(now);
958 mutex_unlock(&c->sb_lock);
960 for_each_rw_member(ca, c, i)
961 bch2_dev_allocator_add(c, ca);
962 bch2_recalc_capacity(c);
964 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
965 ? bch2_fs_recovery(c)
966 : bch2_fs_initialize(c);
970 ret = bch2_opts_check_may_set(c);
974 if (bch2_fs_init_fault("fs_start")) {
975 bch_err(c, "fs_start fault injected");
980 set_bit(BCH_FS_STARTED, &c->flags);
982 if (c->opts.read_only || c->opts.nochanges) {
983 bch2_fs_read_only(c);
985 ret = !test_bit(BCH_FS_RW, &c->flags)
986 ? bch2_fs_read_write(c)
987 : bch2_fs_read_write_late(c);
994 up_write(&c->state_lock);
997 bch_err_msg(c, ret, "starting filesystem");
1001 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
1003 struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx);
1005 if (le16_to_cpu(sb->block_size) != block_sectors(c))
1006 return -BCH_ERR_mismatched_block_size;
1008 if (le16_to_cpu(m.bucket_size) <
1009 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
1010 return -BCH_ERR_bucket_size_too_small;
1015 static int bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
1017 struct bch_sb *newest =
1018 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
1020 if (!uuid_equal(&fs->uuid, &sb->uuid))
1021 return -BCH_ERR_device_not_a_member_of_filesystem;
1023 if (!bch2_dev_exists(newest, sb->dev_idx))
1024 return -BCH_ERR_device_has_been_removed;
1026 if (fs->block_size != sb->block_size)
1027 return -BCH_ERR_mismatched_block_size;
1032 /* Device startup/shutdown: */
1034 static void bch2_dev_release(struct kobject *kobj)
1036 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
1041 static void bch2_dev_free(struct bch_dev *ca)
1043 cancel_work_sync(&ca->io_error_work);
1045 if (ca->kobj.state_in_sysfs &&
1047 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1049 if (ca->kobj.state_in_sysfs)
1050 kobject_del(&ca->kobj);
1052 bch2_free_super(&ca->disk_sb);
1053 bch2_dev_journal_exit(ca);
1055 free_percpu(ca->io_done);
1056 bioset_exit(&ca->replica_set);
1057 bch2_dev_buckets_free(ca);
1058 free_page((unsigned long) ca->sb_read_scratch);
1060 bch2_time_stats_exit(&ca->io_latency[WRITE]);
1061 bch2_time_stats_exit(&ca->io_latency[READ]);
1063 percpu_ref_exit(&ca->io_ref);
1064 percpu_ref_exit(&ca->ref);
1065 kobject_put(&ca->kobj);
1068 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1071 lockdep_assert_held(&c->state_lock);
1073 if (percpu_ref_is_zero(&ca->io_ref))
1076 __bch2_dev_read_only(c, ca);
1078 reinit_completion(&ca->io_ref_completion);
1079 percpu_ref_kill(&ca->io_ref);
1080 wait_for_completion(&ca->io_ref_completion);
1082 if (ca->kobj.state_in_sysfs) {
1083 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1084 sysfs_remove_link(&ca->kobj, "block");
1087 bch2_free_super(&ca->disk_sb);
1088 bch2_dev_journal_exit(ca);
1091 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1093 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1095 complete(&ca->ref_completion);
1098 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1100 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1102 complete(&ca->io_ref_completion);
1105 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1109 if (!c->kobj.state_in_sysfs)
1112 if (!ca->kobj.state_in_sysfs) {
1113 ret = kobject_add(&ca->kobj, &c->kobj,
1114 "dev-%u", ca->dev_idx);
1119 if (ca->disk_sb.bdev) {
1120 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1122 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1126 ret = sysfs_create_link(&ca->kobj, block, "block");
1134 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1135 struct bch_member *member)
1140 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1144 kobject_init(&ca->kobj, &bch2_dev_ktype);
1145 init_completion(&ca->ref_completion);
1146 init_completion(&ca->io_ref_completion);
1148 init_rwsem(&ca->bucket_lock);
1150 INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1152 bch2_time_stats_init(&ca->io_latency[READ]);
1153 bch2_time_stats_init(&ca->io_latency[WRITE]);
1155 ca->mi = bch2_mi_to_cpu(member);
1157 for (i = 0; i < ARRAY_SIZE(member->errors); i++)
1158 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i]));
1160 ca->uuid = member->uuid;
1162 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
1163 ca->mi.bucket_size / btree_sectors(c));
1165 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
1167 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1168 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1169 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
1170 bch2_dev_buckets_alloc(c, ca) ||
1171 bioset_init(&ca->replica_set, 4,
1172 offsetof(struct bch_write_bio, bio), 0) ||
1173 !(ca->io_done = alloc_percpu(*ca->io_done)))
1182 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1185 ca->dev_idx = dev_idx;
1186 __set_bit(ca->dev_idx, ca->self.d);
1187 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1190 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1192 if (bch2_dev_sysfs_online(c, ca))
1193 pr_warn("error creating sysfs objects");
1196 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1198 struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx);
1199 struct bch_dev *ca = NULL;
1202 if (bch2_fs_init_fault("dev_alloc"))
1205 ca = __bch2_dev_alloc(c, &member);
1211 bch2_dev_attach(c, ca, dev_idx);
1216 return -BCH_ERR_ENOMEM_dev_alloc;
1219 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1223 if (bch2_dev_is_online(ca)) {
1224 bch_err(ca, "already have device online in slot %u",
1226 return -BCH_ERR_device_already_online;
1229 if (get_capacity(sb->bdev->bd_disk) <
1230 ca->mi.bucket_size * ca->mi.nbuckets) {
1231 bch_err(ca, "cannot online: device too small");
1232 return -BCH_ERR_device_size_too_small;
1235 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1237 ret = bch2_dev_journal_init(ca, sb->sb);
1243 memset(sb, 0, sizeof(*sb));
1245 ca->dev = ca->disk_sb.bdev->bd_dev;
1247 percpu_ref_reinit(&ca->io_ref);
1252 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1257 lockdep_assert_held(&c->state_lock);
1259 if (le64_to_cpu(sb->sb->seq) >
1260 le64_to_cpu(c->disk_sb.sb->seq))
1261 bch2_sb_to_fs(c, sb->sb);
1263 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1264 !c->devs[sb->sb->dev_idx]);
1266 ca = bch_dev_locked(c, sb->sb->dev_idx);
1268 ret = __bch2_dev_attach_bdev(ca, sb);
1272 bch2_dev_sysfs_online(c, ca);
1274 if (c->sb.nr_devices == 1)
1275 snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev);
1276 snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev);
1278 rebalance_wakeup(c);
1282 /* Device management: */
1285 * Note: this function is also used by the error paths - when a particular
1286 * device sees an error, we call it to determine whether we can just set the
1287 * device RO, or - if this function returns false - we'll set the whole
1290 * XXX: maybe we should be more explicit about whether we're changing state
1291 * because we got an error or what have you?
1293 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1294 enum bch_member_state new_state, int flags)
1296 struct bch_devs_mask new_online_devs;
1297 struct bch_dev *ca2;
1298 int i, nr_rw = 0, required;
1300 lockdep_assert_held(&c->state_lock);
1302 switch (new_state) {
1303 case BCH_MEMBER_STATE_rw:
1305 case BCH_MEMBER_STATE_ro:
1306 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1309 /* do we have enough devices to write to? */
1310 for_each_member_device(ca2, c, i)
1312 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1314 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1315 ? c->opts.metadata_replicas
1316 : c->opts.metadata_replicas_required,
1317 !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1318 ? c->opts.data_replicas
1319 : c->opts.data_replicas_required);
1321 return nr_rw >= required;
1322 case BCH_MEMBER_STATE_failed:
1323 case BCH_MEMBER_STATE_spare:
1324 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1325 ca->mi.state != BCH_MEMBER_STATE_ro)
1328 /* do we have enough devices to read from? */
1329 new_online_devs = bch2_online_devs(c);
1330 __clear_bit(ca->dev_idx, new_online_devs.d);
1332 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1338 static bool bch2_fs_may_start(struct bch_fs *c)
1341 unsigned i, flags = 0;
1343 if (c->opts.very_degraded)
1344 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1346 if (c->opts.degraded)
1347 flags |= BCH_FORCE_IF_DEGRADED;
1349 if (!c->opts.degraded &&
1350 !c->opts.very_degraded) {
1351 mutex_lock(&c->sb_lock);
1353 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1354 if (!bch2_dev_exists(c->disk_sb.sb, i))
1357 ca = bch_dev_locked(c, i);
1359 if (!bch2_dev_is_online(ca) &&
1360 (ca->mi.state == BCH_MEMBER_STATE_rw ||
1361 ca->mi.state == BCH_MEMBER_STATE_ro)) {
1362 mutex_unlock(&c->sb_lock);
1366 mutex_unlock(&c->sb_lock);
1369 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1372 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1375 * The allocator thread itself allocates btree nodes, so stop it first:
1377 bch2_dev_allocator_remove(c, ca);
1378 bch2_dev_journal_stop(&c->journal, ca);
1381 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1383 lockdep_assert_held(&c->state_lock);
1385 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1387 bch2_dev_allocator_add(c, ca);
1388 bch2_recalc_capacity(c);
1391 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1392 enum bch_member_state new_state, int flags)
1394 struct bch_member *m;
1397 if (ca->mi.state == new_state)
1400 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1401 return -BCH_ERR_device_state_not_allowed;
1403 if (new_state != BCH_MEMBER_STATE_rw)
1404 __bch2_dev_read_only(c, ca);
1406 bch_notice(ca, "%s", bch2_member_states[new_state]);
1408 mutex_lock(&c->sb_lock);
1409 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1410 SET_BCH_MEMBER_STATE(m, new_state);
1411 bch2_write_super(c);
1412 mutex_unlock(&c->sb_lock);
1414 if (new_state == BCH_MEMBER_STATE_rw)
1415 __bch2_dev_read_write(c, ca);
1417 rebalance_wakeup(c);
1422 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1423 enum bch_member_state new_state, int flags)
1427 down_write(&c->state_lock);
1428 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1429 up_write(&c->state_lock);
1434 /* Device add/removal: */
1436 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
1438 struct bpos start = POS(ca->dev_idx, 0);
1439 struct bpos end = POS(ca->dev_idx, U64_MAX);
1443 * We clear the LRU and need_discard btrees first so that we don't race
1444 * with bch2_do_invalidates() and bch2_do_discards()
1446 ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end,
1447 BTREE_TRIGGER_NORUN, NULL) ?:
1448 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end,
1449 BTREE_TRIGGER_NORUN, NULL) ?:
1450 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end,
1451 BTREE_TRIGGER_NORUN, NULL) ?:
1452 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end,
1453 BTREE_TRIGGER_NORUN, NULL) ?:
1454 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end,
1455 BTREE_TRIGGER_NORUN, NULL) ?:
1456 bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end,
1457 BTREE_TRIGGER_NORUN, NULL);
1459 bch_err_msg(c, ret, "removing dev alloc info");
1464 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1466 struct bch_member *m;
1467 unsigned dev_idx = ca->dev_idx, data;
1470 down_write(&c->state_lock);
1473 * We consume a reference to ca->ref, regardless of whether we succeed
1476 percpu_ref_put(&ca->ref);
1478 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1479 bch_err(ca, "Cannot remove without losing data");
1480 ret = -BCH_ERR_device_state_not_allowed;
1484 __bch2_dev_read_only(c, ca);
1486 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1488 bch_err_msg(ca, ret, "dropping data");
1492 ret = bch2_dev_remove_alloc(c, ca);
1494 bch_err_msg(ca, ret, "deleting alloc info");
1498 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1500 bch_err_msg(ca, ret, "flushing journal");
1504 ret = bch2_journal_flush(&c->journal);
1506 bch_err(ca, "journal error");
1510 ret = bch2_replicas_gc2(c);
1512 bch_err_msg(ca, ret, "in replicas_gc2()");
1516 data = bch2_dev_has_data(c, ca);
1518 struct printbuf data_has = PRINTBUF;
1520 prt_bitflags(&data_has, bch2_data_types, data);
1521 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
1522 printbuf_exit(&data_has);
1527 __bch2_dev_offline(c, ca);
1529 mutex_lock(&c->sb_lock);
1530 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1531 mutex_unlock(&c->sb_lock);
1533 percpu_ref_kill(&ca->ref);
1534 wait_for_completion(&ca->ref_completion);
1539 * At this point the device object has been removed in-core, but the
1540 * on-disk journal might still refer to the device index via sb device
1541 * usage entries. Recovery fails if it sees usage information for an
1542 * invalid device. Flush journal pins to push the back of the journal
1543 * past now invalid device index references before we update the
1544 * superblock, but after the device object has been removed so any
1545 * further journal writes elide usage info for the device.
1547 bch2_journal_flush_all_pins(&c->journal);
1550 * Free this device's slot in the bch_member array - all pointers to
1551 * this device must be gone:
1553 mutex_lock(&c->sb_lock);
1554 m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1555 memset(&m->uuid, 0, sizeof(m->uuid));
1557 bch2_write_super(c);
1559 mutex_unlock(&c->sb_lock);
1560 up_write(&c->state_lock);
1562 bch2_dev_usage_journal_reserve(c);
1565 if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1566 !percpu_ref_is_zero(&ca->io_ref))
1567 __bch2_dev_read_write(c, ca);
1568 up_write(&c->state_lock);
1572 /* Add new device to running filesystem: */
1573 int bch2_dev_add(struct bch_fs *c, const char *path)
1575 struct bch_opts opts = bch2_opts_empty();
1576 struct bch_sb_handle sb;
1577 struct bch_dev *ca = NULL;
1578 struct bch_sb_field_members_v2 *mi;
1579 struct bch_member dev_mi;
1580 unsigned dev_idx, nr_devices, u64s;
1581 struct printbuf errbuf = PRINTBUF;
1582 struct printbuf label = PRINTBUF;
1585 ret = bch2_read_super(path, &opts, &sb);
1587 bch_err_msg(c, ret, "reading super");
1591 dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx);
1593 if (BCH_MEMBER_GROUP(&dev_mi)) {
1594 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
1595 if (label.allocation_failure) {
1601 ret = bch2_dev_may_add(sb.sb, c);
1607 ca = __bch2_dev_alloc(c, &dev_mi);
1613 bch2_dev_usage_init(ca);
1615 ret = __bch2_dev_attach_bdev(ca, &sb);
1619 ret = bch2_dev_journal_alloc(ca);
1621 bch_err_msg(c, ret, "allocating journal");
1625 down_write(&c->state_lock);
1626 mutex_lock(&c->sb_lock);
1628 ret = bch2_sb_from_fs(c, ca);
1630 bch_err_msg(c, ret, "setting up new superblock");
1634 if (dynamic_fault("bcachefs:add:no_slot"))
1637 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1638 if (!bch2_dev_exists(c->disk_sb.sb, dev_idx))
1641 ret = -BCH_ERR_ENOSPC_sb_members;
1642 bch_err_msg(c, ret, "setting up new superblock");
1646 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1648 mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
1649 u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) +
1650 le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64));
1652 mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s);
1654 ret = -BCH_ERR_ENOSPC_sb_members;
1655 bch_err_msg(c, ret, "setting up new superblock");
1658 struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1663 m->last_mount = cpu_to_le64(ktime_get_real_seconds());
1664 c->disk_sb.sb->nr_devices = nr_devices;
1666 ca->disk_sb.sb->dev_idx = dev_idx;
1667 bch2_dev_attach(c, ca, dev_idx);
1669 if (BCH_MEMBER_GROUP(&dev_mi)) {
1670 ret = __bch2_dev_group_set(c, ca, label.buf);
1672 bch_err_msg(c, ret, "creating new label");
1677 bch2_write_super(c);
1678 mutex_unlock(&c->sb_lock);
1680 bch2_dev_usage_journal_reserve(c);
1682 ret = bch2_trans_mark_dev_sb(c, ca);
1684 bch_err_msg(ca, ret, "marking new superblock");
1688 ret = bch2_fs_freespace_init(c);
1690 bch_err_msg(ca, ret, "initializing free space");
1694 ca->new_fs_bucket_idx = 0;
1696 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1697 __bch2_dev_read_write(c, ca);
1699 up_write(&c->state_lock);
1703 mutex_unlock(&c->sb_lock);
1704 up_write(&c->state_lock);
1708 bch2_free_super(&sb);
1709 printbuf_exit(&label);
1710 printbuf_exit(&errbuf);
1713 up_write(&c->state_lock);
1718 /* Hot add existing device to running filesystem: */
1719 int bch2_dev_online(struct bch_fs *c, const char *path)
1721 struct bch_opts opts = bch2_opts_empty();
1722 struct bch_sb_handle sb = { NULL };
1727 down_write(&c->state_lock);
1729 ret = bch2_read_super(path, &opts, &sb);
1731 up_write(&c->state_lock);
1735 dev_idx = sb.sb->dev_idx;
1737 ret = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
1739 bch_err_msg(c, ret, "bringing %s online", path);
1743 ret = bch2_dev_attach_bdev(c, &sb);
1747 ca = bch_dev_locked(c, dev_idx);
1749 ret = bch2_trans_mark_dev_sb(c, ca);
1751 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path);
1755 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1756 __bch2_dev_read_write(c, ca);
1758 if (!ca->mi.freespace_initialized) {
1759 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);
1760 bch_err_msg(ca, ret, "initializing free space");
1765 if (!ca->journal.nr) {
1766 ret = bch2_dev_journal_alloc(ca);
1767 bch_err_msg(ca, ret, "allocating journal");
1772 mutex_lock(&c->sb_lock);
1773 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount =
1774 cpu_to_le64(ktime_get_real_seconds());
1775 bch2_write_super(c);
1776 mutex_unlock(&c->sb_lock);
1778 up_write(&c->state_lock);
1781 up_write(&c->state_lock);
1782 bch2_free_super(&sb);
1786 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1788 down_write(&c->state_lock);
1790 if (!bch2_dev_is_online(ca)) {
1791 bch_err(ca, "Already offline");
1792 up_write(&c->state_lock);
1796 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1797 bch_err(ca, "Cannot offline required disk");
1798 up_write(&c->state_lock);
1799 return -BCH_ERR_device_state_not_allowed;
1802 __bch2_dev_offline(c, ca);
1804 up_write(&c->state_lock);
1808 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1810 struct bch_member *m;
1814 down_write(&c->state_lock);
1815 old_nbuckets = ca->mi.nbuckets;
1817 if (nbuckets < ca->mi.nbuckets) {
1818 bch_err(ca, "Cannot shrink yet");
1823 if (bch2_dev_is_online(ca) &&
1824 get_capacity(ca->disk_sb.bdev->bd_disk) <
1825 ca->mi.bucket_size * nbuckets) {
1826 bch_err(ca, "New size larger than device");
1827 ret = -BCH_ERR_device_size_too_small;
1831 ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1833 bch_err_msg(ca, ret, "resizing buckets");
1837 ret = bch2_trans_mark_dev_sb(c, ca);
1841 mutex_lock(&c->sb_lock);
1842 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1843 m->nbuckets = cpu_to_le64(nbuckets);
1845 bch2_write_super(c);
1846 mutex_unlock(&c->sb_lock);
1848 if (ca->mi.freespace_initialized) {
1849 ret = bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets);
1854 * XXX: this is all wrong transactionally - we'll be able to do
1855 * this correctly after the disk space accounting rewrite
1857 ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets;
1860 bch2_recalc_capacity(c);
1862 up_write(&c->state_lock);
1866 /* return with ref on ca->ref: */
1867 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
1873 for_each_member_device_rcu(ca, c, i, NULL)
1874 if (!strcmp(name, ca->name))
1876 ca = ERR_PTR(-BCH_ERR_ENOENT_dev_not_found);
1883 /* Filesystem open: */
1885 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
1886 struct bch_opts opts)
1888 struct bch_sb_handle *sb = NULL;
1889 struct bch_fs *c = NULL;
1890 unsigned i, best_sb = 0;
1891 struct printbuf errbuf = PRINTBUF;
1894 if (!try_module_get(THIS_MODULE))
1895 return ERR_PTR(-ENODEV);
1902 sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1908 for (i = 0; i < nr_devices; i++) {
1909 ret = bch2_read_super(devices[i], &opts, &sb[i]);
1915 for (i = 1; i < nr_devices; i++)
1916 if (le64_to_cpu(sb[i].sb->seq) >
1917 le64_to_cpu(sb[best_sb].sb->seq))
1921 while (i < nr_devices) {
1923 !bch2_dev_exists(sb[best_sb].sb, sb[i].sb->dev_idx)) {
1924 pr_info("%pg has been removed, skipping", sb[i].bdev);
1925 bch2_free_super(&sb[i]);
1926 array_remove_item(sb, nr_devices, i);
1930 ret = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1936 c = bch2_fs_alloc(sb[best_sb].sb, opts);
1942 down_write(&c->state_lock);
1943 for (i = 0; i < nr_devices; i++) {
1944 ret = bch2_dev_attach_bdev(c, &sb[i]);
1946 up_write(&c->state_lock);
1950 up_write(&c->state_lock);
1952 if (!bch2_fs_may_start(c)) {
1953 ret = -BCH_ERR_insufficient_devices_to_start;
1957 if (!c->opts.nostart) {
1958 ret = bch2_fs_start(c);
1964 printbuf_exit(&errbuf);
1965 module_put(THIS_MODULE);
1968 pr_err("bch_fs_open err opening %s: %s",
1969 devices[0], bch2_err_str(ret));
1971 if (!IS_ERR_OR_NULL(c))
1974 for (i = 0; i < nr_devices; i++)
1975 bch2_free_super(&sb[i]);
1980 /* Global interfaces/init */
1982 static void bcachefs_exit(void)
1986 bch2_chardev_exit();
1987 bch2_btree_key_cache_exit();
1989 kset_unregister(bcachefs_kset);
1992 static int __init bcachefs_init(void)
1994 bch2_bkey_pack_test();
1996 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
1997 bch2_btree_key_cache_init() ||
1998 bch2_chardev_init() ||
2009 #define BCH_DEBUG_PARAM(name, description) \
2011 module_param_named(name, bch2_##name, bool, 0644); \
2012 MODULE_PARM_DESC(name, description);
2014 #undef BCH_DEBUG_PARAM
2017 static unsigned bch2_metadata_version = bcachefs_metadata_version_current;
2018 module_param_named(version, bch2_metadata_version, uint, 0400);
2020 module_exit(bcachefs_exit);
2021 module_init(bcachefs_init);