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_key_cache.h"
17 #include "btree_update_interior.h"
24 #include "disk_groups.h"
33 #include "journal_reclaim.h"
34 #include "journal_seq_blacklist.h"
39 #include "rebalance.h"
42 #include "subvolume.h"
47 #include <linux/backing-dev.h>
48 #include <linux/blkdev.h>
49 #include <linux/debugfs.h>
50 #include <linux/device.h>
51 #include <linux/genhd.h>
52 #include <linux/idr.h>
53 #include <linux/module.h>
54 #include <linux/percpu.h>
55 #include <linux/random.h>
56 #include <linux/sysfs.h>
57 #include <crypto/hash.h>
59 #include <trace/events/bcachefs.h>
61 MODULE_LICENSE("GPL");
62 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
65 struct kobj_type type ## _ktype = { \
66 .release = type ## _release, \
67 .sysfs_ops = &type ## _sysfs_ops, \
68 .default_attrs = type ## _files \
71 static void bch2_fs_release(struct kobject *);
72 static void bch2_dev_release(struct kobject *);
74 static void bch2_fs_internal_release(struct kobject *k)
78 static void bch2_fs_opts_dir_release(struct kobject *k)
82 static void bch2_fs_time_stats_release(struct kobject *k)
86 static KTYPE(bch2_fs);
87 static KTYPE(bch2_fs_internal);
88 static KTYPE(bch2_fs_opts_dir);
89 static KTYPE(bch2_fs_time_stats);
90 static KTYPE(bch2_dev);
92 static struct kset *bcachefs_kset;
93 static LIST_HEAD(bch_fs_list);
94 static DEFINE_MUTEX(bch_fs_list_lock);
96 static DECLARE_WAIT_QUEUE_HEAD(bch_read_only_wait);
98 static void bch2_dev_free(struct bch_dev *);
99 static int bch2_dev_alloc(struct bch_fs *, unsigned);
100 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
101 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
103 struct bch_fs *bch2_dev_to_fs(dev_t dev)
109 mutex_lock(&bch_fs_list_lock);
112 list_for_each_entry(c, &bch_fs_list, list)
113 for_each_member_device_rcu(ca, c, i, NULL)
114 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
121 mutex_unlock(&bch_fs_list_lock);
126 static struct bch_fs *__bch2_uuid_to_fs(uuid_le uuid)
130 lockdep_assert_held(&bch_fs_list_lock);
132 list_for_each_entry(c, &bch_fs_list, list)
133 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid_le)))
139 struct bch_fs *bch2_uuid_to_fs(uuid_le uuid)
143 mutex_lock(&bch_fs_list_lock);
144 c = __bch2_uuid_to_fs(uuid);
147 mutex_unlock(&bch_fs_list_lock);
152 static void bch2_dev_usage_journal_reserve(struct bch_fs *c)
155 unsigned i, nr = 0, u64s =
156 ((sizeof(struct jset_entry_dev_usage) +
157 sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) /
161 for_each_member_device_rcu(ca, c, i, NULL)
165 bch2_journal_entry_res_resize(&c->journal,
166 &c->dev_usage_journal_res, u64s * nr);
169 /* Filesystem RO/RW: */
172 * For startup/shutdown of RW stuff, the dependencies are:
174 * - foreground writes depend on copygc and rebalance (to free up space)
176 * - copygc and rebalance depend on mark and sweep gc (they actually probably
177 * don't because they either reserve ahead of time or don't block if
178 * allocations fail, but allocations can require mark and sweep gc to run
179 * because of generation number wraparound)
181 * - all of the above depends on the allocator threads
183 * - allocator depends on the journal (when it rewrites prios and gens)
186 static void __bch2_fs_read_only(struct bch_fs *c)
189 unsigned i, clean_passes = 0;
191 bch2_rebalance_stop(c);
193 bch2_gc_thread_stop(c);
196 * Flush journal before stopping allocators, because flushing journal
197 * blacklist entries involves allocating new btree nodes:
199 bch2_journal_flush_all_pins(&c->journal);
202 * If the allocator threads didn't all start up, the btree updates to
203 * write out alloc info aren't going to work:
205 if (!test_bit(BCH_FS_ALLOCATOR_RUNNING, &c->flags))
208 bch_verbose(c, "flushing journal and stopping allocators");
210 bch2_journal_flush_all_pins(&c->journal);
211 set_bit(BCH_FS_ALLOCATOR_STOPPING, &c->flags);
216 if (bch2_journal_flush_all_pins(&c->journal))
220 * In flight interior btree updates will generate more journal
221 * updates and btree updates (alloc btree):
223 if (bch2_btree_interior_updates_nr_pending(c)) {
224 closure_wait_event(&c->btree_interior_update_wait,
225 !bch2_btree_interior_updates_nr_pending(c));
228 flush_work(&c->btree_interior_update_work);
230 if (bch2_journal_flush_all_pins(&c->journal))
232 } while (clean_passes < 2);
233 bch_verbose(c, "flushing journal and stopping allocators complete");
235 set_bit(BCH_FS_ALLOC_CLEAN, &c->flags);
237 closure_wait_event(&c->btree_interior_update_wait,
238 !bch2_btree_interior_updates_nr_pending(c));
239 flush_work(&c->btree_interior_update_work);
241 for_each_member_device(ca, c, i)
242 bch2_dev_allocator_stop(ca);
244 clear_bit(BCH_FS_ALLOCATOR_RUNNING, &c->flags);
245 clear_bit(BCH_FS_ALLOCATOR_STOPPING, &c->flags);
247 bch2_fs_journal_stop(&c->journal);
250 * the journal kicks off btree writes via reclaim - wait for in flight
251 * writes after stopping journal:
253 bch2_btree_flush_all_writes(c);
256 * After stopping journal:
258 for_each_member_device(ca, c, i)
259 bch2_dev_allocator_remove(c, ca);
262 static void bch2_writes_disabled(struct percpu_ref *writes)
264 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
266 set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
267 wake_up(&bch_read_only_wait);
270 void bch2_fs_read_only(struct bch_fs *c)
272 if (!test_bit(BCH_FS_RW, &c->flags)) {
273 bch2_journal_reclaim_stop(&c->journal);
277 BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
280 * Block new foreground-end write operations from starting - any new
281 * writes will return -EROFS:
283 * (This is really blocking new _allocations_, writes to previously
284 * allocated space can still happen until stopping the allocator in
285 * bch2_dev_allocator_stop()).
287 percpu_ref_kill(&c->writes);
289 cancel_work_sync(&c->ec_stripe_delete_work);
292 * If we're not doing an emergency shutdown, we want to wait on
293 * outstanding writes to complete so they don't see spurious errors due
294 * to shutting down the allocator:
296 * If we are doing an emergency shutdown outstanding writes may
297 * hang until we shutdown the allocator so we don't want to wait
298 * on outstanding writes before shutting everything down - but
299 * we do need to wait on them before returning and signalling
300 * that going RO is complete:
302 wait_event(bch_read_only_wait,
303 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
304 test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
306 __bch2_fs_read_only(c);
308 wait_event(bch_read_only_wait,
309 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
311 clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
313 if (!bch2_journal_error(&c->journal) &&
314 !test_bit(BCH_FS_ERROR, &c->flags) &&
315 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) &&
316 test_bit(BCH_FS_STARTED, &c->flags) &&
317 test_bit(BCH_FS_ALLOC_CLEAN, &c->flags) &&
318 !c->opts.norecovery) {
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(&bch_read_only_wait);
352 static int bch2_fs_read_write_late(struct bch_fs *c)
356 ret = bch2_gc_thread_start(c);
358 bch_err(c, "error starting gc thread");
362 ret = bch2_copygc_start(c);
364 bch_err(c, "error starting copygc thread");
368 ret = bch2_rebalance_start(c);
370 bch_err(c, "error starting rebalance thread");
374 schedule_work(&c->ec_stripe_delete_work);
379 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
385 if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) {
386 bch_err(c, "cannot go rw, unfixed btree errors");
390 if (test_bit(BCH_FS_RW, &c->flags))
394 * nochanges is used for fsck -n mode - we have to allow going rw
395 * during recovery for that to work:
397 if (c->opts.norecovery ||
398 (c->opts.nochanges &&
399 (!early || c->opts.read_only)))
402 bch_info(c, "going read-write");
404 ret = bch2_fs_mark_dirty(c);
408 clear_bit(BCH_FS_ALLOC_CLEAN, &c->flags);
410 for_each_rw_member(ca, c, i)
411 bch2_dev_allocator_add(c, ca);
412 bch2_recalc_capacity(c);
414 for_each_rw_member(ca, c, i) {
415 ret = bch2_dev_allocator_start(ca);
417 bch_err(c, "error starting allocator threads");
418 percpu_ref_put(&ca->io_ref);
423 set_bit(BCH_FS_ALLOCATOR_RUNNING, &c->flags);
425 for_each_rw_member(ca, c, i)
426 bch2_wake_allocator(ca);
429 ret = bch2_fs_read_write_late(c);
434 percpu_ref_reinit(&c->writes);
435 set_bit(BCH_FS_RW, &c->flags);
436 set_bit(BCH_FS_WAS_RW, &c->flags);
439 __bch2_fs_read_only(c);
443 int bch2_fs_read_write(struct bch_fs *c)
445 return __bch2_fs_read_write(c, false);
448 int bch2_fs_read_write_early(struct bch_fs *c)
450 lockdep_assert_held(&c->state_lock);
452 return __bch2_fs_read_write(c, true);
455 /* Filesystem startup/shutdown: */
457 static void __bch2_fs_free(struct bch_fs *c)
462 for (i = 0; i < BCH_TIME_STAT_NR; i++)
463 bch2_time_stats_exit(&c->times[i]);
465 bch2_fs_snapshots_exit(c);
466 bch2_fs_quota_exit(c);
467 bch2_fs_fsio_exit(c);
469 bch2_fs_encryption_exit(c);
471 bch2_fs_btree_interior_update_exit(c);
472 bch2_fs_btree_iter_exit(c);
473 bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
474 bch2_fs_btree_cache_exit(c);
475 bch2_fs_replicas_exit(c);
476 bch2_fs_journal_exit(&c->journal);
477 bch2_io_clock_exit(&c->io_clock[WRITE]);
478 bch2_io_clock_exit(&c->io_clock[READ]);
479 bch2_fs_compress_exit(c);
480 bch2_journal_keys_free(&c->journal_keys);
481 bch2_journal_entries_free(&c->journal_entries);
482 percpu_free_rwsem(&c->mark_lock);
484 if (c->btree_paths_bufs)
485 for_each_possible_cpu(cpu)
486 kfree(per_cpu_ptr(c->btree_paths_bufs, cpu)->path);
488 free_percpu(c->online_reserved);
489 free_percpu(c->btree_paths_bufs);
490 free_percpu(c->pcpu);
491 mempool_exit(&c->large_bkey_pool);
492 mempool_exit(&c->btree_bounce_pool);
493 bioset_exit(&c->btree_bio);
494 mempool_exit(&c->fill_iter);
495 percpu_ref_exit(&c->writes);
496 kfree(rcu_dereference_protected(c->disk_groups, 1));
497 kfree(c->journal_seq_blacklist_table);
498 kfree(c->unused_inode_hints);
499 free_heap(&c->copygc_heap);
501 if (c->io_complete_wq )
502 destroy_workqueue(c->io_complete_wq );
504 destroy_workqueue(c->copygc_wq);
505 if (c->btree_io_complete_wq)
506 destroy_workqueue(c->btree_io_complete_wq);
507 if (c->btree_update_wq)
508 destroy_workqueue(c->btree_update_wq);
510 bch2_free_super(&c->disk_sb);
511 kvpfree(c, sizeof(*c));
512 module_put(THIS_MODULE);
515 static void bch2_fs_release(struct kobject *kobj)
517 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
522 void __bch2_fs_stop(struct bch_fs *c)
527 bch_verbose(c, "shutting down");
529 set_bit(BCH_FS_STOPPING, &c->flags);
531 down_write(&c->state_lock);
532 bch2_fs_read_only(c);
533 up_write(&c->state_lock);
535 for_each_member_device(ca, c, i)
536 if (ca->kobj.state_in_sysfs &&
538 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
540 if (c->kobj.state_in_sysfs)
541 kobject_del(&c->kobj);
543 bch2_fs_debug_exit(c);
544 bch2_fs_chardev_exit(c);
546 kobject_put(&c->time_stats);
547 kobject_put(&c->opts_dir);
548 kobject_put(&c->internal);
550 /* btree prefetch might have kicked off reads in the background: */
551 bch2_btree_flush_all_reads(c);
553 for_each_member_device(ca, c, i)
554 cancel_work_sync(&ca->io_error_work);
556 cancel_work_sync(&c->read_only_work);
558 for (i = 0; i < c->sb.nr_devices; i++)
560 bch2_free_super(&c->devs[i]->disk_sb);
563 void bch2_fs_free(struct bch_fs *c)
567 mutex_lock(&bch_fs_list_lock);
569 mutex_unlock(&bch_fs_list_lock);
571 closure_sync(&c->cl);
572 closure_debug_destroy(&c->cl);
574 for (i = 0; i < c->sb.nr_devices; i++)
576 bch2_dev_free(rcu_dereference_protected(c->devs[i], 1));
578 bch_verbose(c, "shutdown complete");
580 kobject_put(&c->kobj);
583 void bch2_fs_stop(struct bch_fs *c)
589 static int bch2_fs_online(struct bch_fs *c)
595 lockdep_assert_held(&bch_fs_list_lock);
597 if (__bch2_uuid_to_fs(c->sb.uuid)) {
598 bch_err(c, "filesystem UUID already open");
602 ret = bch2_fs_chardev_init(c);
604 bch_err(c, "error creating character device");
608 bch2_fs_debug_init(c);
610 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
611 kobject_add(&c->internal, &c->kobj, "internal") ?:
612 kobject_add(&c->opts_dir, &c->kobj, "options") ?:
613 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
614 bch2_opts_create_sysfs_files(&c->opts_dir);
616 bch_err(c, "error creating sysfs objects");
620 down_write(&c->state_lock);
622 for_each_member_device(ca, c, i) {
623 ret = bch2_dev_sysfs_online(c, ca);
625 bch_err(c, "error creating sysfs objects");
626 percpu_ref_put(&ca->ref);
631 BUG_ON(!list_empty(&c->list));
632 list_add(&c->list, &bch_fs_list);
634 up_write(&c->state_lock);
638 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
640 struct bch_sb_field_members *mi;
642 unsigned i, iter_size;
645 pr_verbose_init(opts, "");
647 c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
649 c = ERR_PTR(-ENOMEM);
653 __module_get(THIS_MODULE);
655 closure_init(&c->cl, NULL);
657 c->kobj.kset = bcachefs_kset;
658 kobject_init(&c->kobj, &bch2_fs_ktype);
659 kobject_init(&c->internal, &bch2_fs_internal_ktype);
660 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
661 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
664 c->disk_sb.fs_sb = true;
666 init_rwsem(&c->state_lock);
667 mutex_init(&c->sb_lock);
668 mutex_init(&c->replicas_gc_lock);
669 mutex_init(&c->btree_root_lock);
670 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
672 init_rwsem(&c->gc_lock);
674 for (i = 0; i < BCH_TIME_STAT_NR; i++)
675 bch2_time_stats_init(&c->times[i]);
677 bch2_fs_copygc_init(c);
678 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
679 bch2_fs_allocator_background_init(c);
680 bch2_fs_allocator_foreground_init(c);
681 bch2_fs_rebalance_init(c);
682 bch2_fs_quota_init(c);
684 INIT_LIST_HEAD(&c->list);
686 mutex_init(&c->usage_scratch_lock);
688 mutex_init(&c->bio_bounce_pages_lock);
689 mutex_init(&c->snapshot_table_lock);
691 spin_lock_init(&c->btree_write_error_lock);
693 INIT_LIST_HEAD(&c->journal_entries);
694 INIT_LIST_HEAD(&c->journal_iters);
696 INIT_LIST_HEAD(&c->fsck_errors);
697 mutex_init(&c->fsck_error_lock);
699 INIT_LIST_HEAD(&c->ec_stripe_head_list);
700 mutex_init(&c->ec_stripe_head_lock);
702 INIT_LIST_HEAD(&c->ec_stripe_new_list);
703 mutex_init(&c->ec_stripe_new_lock);
705 INIT_LIST_HEAD(&c->data_progress_list);
706 mutex_init(&c->data_progress_lock);
708 spin_lock_init(&c->ec_stripes_heap_lock);
710 seqcount_init(&c->gc_pos_lock);
712 seqcount_init(&c->usage_lock);
714 sema_init(&c->io_in_flight, 64);
716 c->copy_gc_enabled = 1;
717 c->rebalance.enabled = 1;
718 c->promote_whole_extents = true;
720 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write];
721 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write];
722 c->journal.blocked_time = &c->times[BCH_TIME_blocked_journal];
723 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
725 bch2_fs_btree_cache_init_early(&c->btree_cache);
727 mutex_init(&c->sectors_available_lock);
729 ret = percpu_init_rwsem(&c->mark_lock);
733 mutex_lock(&c->sb_lock);
734 ret = bch2_sb_to_fs(c, sb);
735 mutex_unlock(&c->sb_lock);
740 scnprintf(c->name, sizeof(c->name), "%pU", &c->sb.user_uuid);
743 if (sb->version <= bcachefs_metadata_version_inode_v2 &&
744 !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
745 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
747 if (sb->version <= bcachefs_metadata_version_inode_v2 &&
748 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
749 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
751 c->opts = bch2_opts_default;
752 ret = bch2_opts_from_sb(&c->opts, sb);
756 bch2_opts_apply(&c->opts, opts);
758 c->block_bits = ilog2(block_sectors(c));
759 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
761 if (bch2_fs_init_fault("fs_alloc")) {
762 bch_err(c, "fs_alloc fault injected");
767 iter_size = sizeof(struct sort_iter) +
768 (btree_blocks(c) + 1) * 2 *
769 sizeof(struct sort_iter_set);
771 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
773 if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
774 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
775 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
776 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
777 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
778 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
779 !(c->io_complete_wq = alloc_workqueue("bcachefs_io",
780 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) ||
781 percpu_ref_init(&c->writes, bch2_writes_disabled,
782 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
783 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
784 bioset_init(&c->btree_bio, 1,
785 max(offsetof(struct btree_read_bio, bio),
786 offsetof(struct btree_write_bio, wbio.bio)),
787 BIOSET_NEED_BVECS) ||
788 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
789 !(c->btree_paths_bufs = alloc_percpu(struct btree_path_buf)) ||
790 !(c->online_reserved = alloc_percpu(u64)) ||
791 mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
793 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
794 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
795 sizeof(u64), GFP_KERNEL))) {
800 ret = bch2_io_clock_init(&c->io_clock[READ]) ?:
801 bch2_io_clock_init(&c->io_clock[WRITE]) ?:
802 bch2_fs_journal_init(&c->journal) ?:
803 bch2_fs_replicas_init(c) ?:
804 bch2_fs_btree_cache_init(c) ?:
805 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
806 bch2_fs_btree_iter_init(c) ?:
807 bch2_fs_btree_interior_update_init(c) ?:
808 bch2_fs_subvolumes_init(c) ?:
809 bch2_fs_io_init(c) ?:
810 bch2_fs_encryption_init(c) ?:
811 bch2_fs_compress_init(c) ?:
812 bch2_fs_ec_init(c) ?:
813 bch2_fs_fsio_init(c);
817 if (c->opts.nochanges)
818 set_bit(JOURNAL_NOCHANGES, &c->journal.flags);
820 mi = bch2_sb_get_members(c->disk_sb.sb);
821 for (i = 0; i < c->sb.nr_devices; i++)
822 if (bch2_dev_exists(c->disk_sb.sb, mi, i) &&
823 bch2_dev_alloc(c, i)) {
828 bch2_journal_entry_res_resize(&c->journal,
829 &c->btree_root_journal_res,
830 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
831 bch2_dev_usage_journal_reserve(c);
832 bch2_journal_entry_res_resize(&c->journal,
833 &c->clock_journal_res,
834 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
836 mutex_lock(&bch_fs_list_lock);
837 ret = bch2_fs_online(c);
838 mutex_unlock(&bch_fs_list_lock);
843 pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
852 static void print_mount_opts(struct bch_fs *c)
856 struct printbuf p = PBUF(buf);
859 strcpy(buf, "(null)");
861 if (c->opts.read_only) {
866 for (i = 0; i < bch2_opts_nr; i++) {
867 const struct bch_option *opt = &bch2_opt_table[i];
868 u64 v = bch2_opt_get_by_id(&c->opts, i);
870 if (!(opt->flags & OPT_MOUNT))
873 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
879 bch2_opt_to_text(&p, c, opt, v, OPT_SHOW_MOUNT_STYLE);
882 bch_info(c, "mounted with opts: %s", buf);
885 int bch2_fs_start(struct bch_fs *c)
887 struct bch_sb_field_members *mi;
889 time64_t now = ktime_get_real_seconds();
893 down_write(&c->state_lock);
895 BUG_ON(test_bit(BCH_FS_STARTED, &c->flags));
897 mutex_lock(&c->sb_lock);
899 for_each_online_member(ca, c, i)
900 bch2_sb_from_fs(c, ca);
902 mi = bch2_sb_get_members(c->disk_sb.sb);
903 for_each_online_member(ca, c, i)
904 mi->members[ca->dev_idx].last_mount = cpu_to_le64(now);
906 mutex_unlock(&c->sb_lock);
908 for_each_rw_member(ca, c, i)
909 bch2_dev_allocator_add(c, ca);
910 bch2_recalc_capacity(c);
912 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
913 ? bch2_fs_recovery(c)
914 : bch2_fs_initialize(c);
918 ret = bch2_opts_check_may_set(c);
923 if (bch2_fs_init_fault("fs_start")) {
924 bch_err(c, "fs_start fault injected");
928 set_bit(BCH_FS_STARTED, &c->flags);
931 * Allocator threads don't start filling copygc reserve until after we
932 * set BCH_FS_STARTED - wake them now:
935 * Need to set ca->allocator_state here instead of relying on the
936 * allocator threads to do it to avoid racing with the copygc threads
937 * checking it and thinking they have no alloc reserve:
939 for_each_online_member(ca, c, i) {
940 ca->allocator_state = ALLOCATOR_running;
941 bch2_wake_allocator(ca);
944 if (c->opts.read_only || c->opts.nochanges) {
945 bch2_fs_read_only(c);
947 ret = !test_bit(BCH_FS_RW, &c->flags)
948 ? bch2_fs_read_write(c)
949 : bch2_fs_read_write_late(c);
957 up_write(&c->state_lock);
961 case BCH_FSCK_ERRORS_NOT_FIXED:
962 bch_err(c, "filesystem contains errors: please report this to the developers");
963 pr_cont("mount with -o fix_errors to repair\n");
965 case BCH_FSCK_REPAIR_UNIMPLEMENTED:
966 bch_err(c, "filesystem contains errors: please report this to the developers");
967 pr_cont("repair unimplemented: inform the developers so that it can be added\n");
969 case BCH_FSCK_REPAIR_IMPOSSIBLE:
970 bch_err(c, "filesystem contains errors, but repair impossible");
972 case BCH_FSCK_UNKNOWN_VERSION:
973 bch_err(c, "unknown metadata version");
976 bch_err(c, "cannot allocate memory");
979 bch_err(c, "IO error");
988 static const char *bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
990 struct bch_sb_field_members *sb_mi;
992 sb_mi = bch2_sb_get_members(sb);
994 return "Invalid superblock: member info area missing";
996 if (le16_to_cpu(sb->block_size) != block_sectors(c))
997 return "mismatched block size";
999 if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <
1000 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
1001 return "new cache bucket size is too small";
1006 static const char *bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
1008 struct bch_sb *newest =
1009 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
1010 struct bch_sb_field_members *mi = bch2_sb_get_members(newest);
1012 if (uuid_le_cmp(fs->uuid, sb->uuid))
1013 return "device not a member of filesystem";
1015 if (!bch2_dev_exists(newest, mi, sb->dev_idx))
1016 return "device has been removed";
1018 if (fs->block_size != sb->block_size)
1019 return "mismatched block size";
1024 /* Device startup/shutdown: */
1026 static void bch2_dev_release(struct kobject *kobj)
1028 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
1033 static void bch2_dev_free(struct bch_dev *ca)
1035 bch2_dev_allocator_stop(ca);
1037 cancel_work_sync(&ca->io_error_work);
1039 if (ca->kobj.state_in_sysfs &&
1041 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1043 if (ca->kobj.state_in_sysfs)
1044 kobject_del(&ca->kobj);
1046 bch2_free_super(&ca->disk_sb);
1047 bch2_dev_journal_exit(ca);
1049 free_percpu(ca->io_done);
1050 bioset_exit(&ca->replica_set);
1051 bch2_dev_buckets_free(ca);
1052 free_page((unsigned long) ca->sb_read_scratch);
1054 bch2_time_stats_exit(&ca->io_latency[WRITE]);
1055 bch2_time_stats_exit(&ca->io_latency[READ]);
1057 percpu_ref_exit(&ca->io_ref);
1058 percpu_ref_exit(&ca->ref);
1059 kobject_put(&ca->kobj);
1062 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1065 lockdep_assert_held(&c->state_lock);
1067 if (percpu_ref_is_zero(&ca->io_ref))
1070 __bch2_dev_read_only(c, ca);
1072 reinit_completion(&ca->io_ref_completion);
1073 percpu_ref_kill(&ca->io_ref);
1074 wait_for_completion(&ca->io_ref_completion);
1076 if (ca->kobj.state_in_sysfs) {
1077 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1078 sysfs_remove_link(&ca->kobj, "block");
1081 bch2_free_super(&ca->disk_sb);
1082 bch2_dev_journal_exit(ca);
1085 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1087 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1089 complete(&ca->ref_completion);
1092 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1094 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1096 complete(&ca->io_ref_completion);
1099 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1103 if (!c->kobj.state_in_sysfs)
1106 if (!ca->kobj.state_in_sysfs) {
1107 ret = kobject_add(&ca->kobj, &c->kobj,
1108 "dev-%u", ca->dev_idx);
1113 if (ca->disk_sb.bdev) {
1114 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1116 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1120 ret = sysfs_create_link(&ca->kobj, block, "block");
1128 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1129 struct bch_member *member)
1133 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1137 kobject_init(&ca->kobj, &bch2_dev_ktype);
1138 init_completion(&ca->ref_completion);
1139 init_completion(&ca->io_ref_completion);
1141 init_rwsem(&ca->bucket_lock);
1143 INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1145 bch2_time_stats_init(&ca->io_latency[READ]);
1146 bch2_time_stats_init(&ca->io_latency[WRITE]);
1148 ca->mi = bch2_mi_to_cpu(member);
1149 ca->uuid = member->uuid;
1151 if (opt_defined(c->opts, discard))
1152 ca->mi.discard = opt_get(c->opts, discard);
1154 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
1156 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1157 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1158 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
1159 bch2_dev_buckets_alloc(c, ca) ||
1160 bioset_init(&ca->replica_set, 4,
1161 offsetof(struct bch_write_bio, bio), 0) ||
1162 !(ca->io_done = alloc_percpu(*ca->io_done)))
1171 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1174 ca->dev_idx = dev_idx;
1175 __set_bit(ca->dev_idx, ca->self.d);
1176 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1179 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1181 if (bch2_dev_sysfs_online(c, ca))
1182 pr_warn("error creating sysfs objects");
1185 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1187 struct bch_member *member =
1188 bch2_sb_get_members(c->disk_sb.sb)->members + dev_idx;
1189 struct bch_dev *ca = NULL;
1192 pr_verbose_init(c->opts, "");
1194 if (bch2_fs_init_fault("dev_alloc"))
1197 ca = __bch2_dev_alloc(c, member);
1203 if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1204 bch2_dev_allocator_start(ca)) {
1209 bch2_dev_attach(c, ca, dev_idx);
1211 pr_verbose_init(c->opts, "ret %i", ret);
1220 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1224 if (bch2_dev_is_online(ca)) {
1225 bch_err(ca, "already have device online in slot %u",
1230 if (get_capacity(sb->bdev->bd_disk) <
1231 ca->mi.bucket_size * ca->mi.nbuckets) {
1232 bch_err(ca, "cannot online: device too small");
1236 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1238 if (get_capacity(sb->bdev->bd_disk) <
1239 ca->mi.bucket_size * ca->mi.nbuckets) {
1240 bch_err(ca, "device too small");
1244 ret = bch2_dev_journal_init(ca, sb->sb);
1250 if (sb->mode & FMODE_EXCL)
1251 ca->disk_sb.bdev->bd_holder = ca;
1252 memset(sb, 0, sizeof(*sb));
1254 percpu_ref_reinit(&ca->io_ref);
1259 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1264 lockdep_assert_held(&c->state_lock);
1266 if (le64_to_cpu(sb->sb->seq) >
1267 le64_to_cpu(c->disk_sb.sb->seq))
1268 bch2_sb_to_fs(c, sb->sb);
1270 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1271 !c->devs[sb->sb->dev_idx]);
1273 ca = bch_dev_locked(c, sb->sb->dev_idx);
1275 ret = __bch2_dev_attach_bdev(ca, sb);
1279 bch2_dev_sysfs_online(c, ca);
1281 if (c->sb.nr_devices == 1)
1282 bdevname(ca->disk_sb.bdev, c->name);
1283 bdevname(ca->disk_sb.bdev, ca->name);
1285 rebalance_wakeup(c);
1289 /* Device management: */
1292 * Note: this function is also used by the error paths - when a particular
1293 * device sees an error, we call it to determine whether we can just set the
1294 * device RO, or - if this function returns false - we'll set the whole
1297 * XXX: maybe we should be more explicit about whether we're changing state
1298 * because we got an error or what have you?
1300 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1301 enum bch_member_state new_state, int flags)
1303 struct bch_devs_mask new_online_devs;
1304 struct bch_dev *ca2;
1305 int i, nr_rw = 0, required;
1307 lockdep_assert_held(&c->state_lock);
1309 switch (new_state) {
1310 case BCH_MEMBER_STATE_rw:
1312 case BCH_MEMBER_STATE_ro:
1313 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1316 /* do we have enough devices to write to? */
1317 for_each_member_device(ca2, c, i)
1319 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1321 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1322 ? c->opts.metadata_replicas
1323 : c->opts.metadata_replicas_required,
1324 !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1325 ? c->opts.data_replicas
1326 : c->opts.data_replicas_required);
1328 return nr_rw >= required;
1329 case BCH_MEMBER_STATE_failed:
1330 case BCH_MEMBER_STATE_spare:
1331 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1332 ca->mi.state != BCH_MEMBER_STATE_ro)
1335 /* do we have enough devices to read from? */
1336 new_online_devs = bch2_online_devs(c);
1337 __clear_bit(ca->dev_idx, new_online_devs.d);
1339 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1345 static bool bch2_fs_may_start(struct bch_fs *c)
1347 struct bch_sb_field_members *mi;
1349 unsigned i, flags = 0;
1351 if (c->opts.very_degraded)
1352 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1354 if (c->opts.degraded)
1355 flags |= BCH_FORCE_IF_DEGRADED;
1357 if (!c->opts.degraded &&
1358 !c->opts.very_degraded) {
1359 mutex_lock(&c->sb_lock);
1360 mi = bch2_sb_get_members(c->disk_sb.sb);
1362 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1363 if (!bch2_dev_exists(c->disk_sb.sb, mi, i))
1366 ca = bch_dev_locked(c, i);
1368 if (!bch2_dev_is_online(ca) &&
1369 (ca->mi.state == BCH_MEMBER_STATE_rw ||
1370 ca->mi.state == BCH_MEMBER_STATE_ro)) {
1371 mutex_unlock(&c->sb_lock);
1375 mutex_unlock(&c->sb_lock);
1378 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1381 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1384 * Device going read only means the copygc reserve get smaller, so we
1385 * don't want that happening while copygc is in progress:
1387 bch2_copygc_stop(c);
1390 * The allocator thread itself allocates btree nodes, so stop it first:
1392 bch2_dev_allocator_stop(ca);
1393 bch2_dev_allocator_remove(c, ca);
1394 bch2_dev_journal_stop(&c->journal, ca);
1396 bch2_copygc_start(c);
1399 static int __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1401 lockdep_assert_held(&c->state_lock);
1403 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1405 bch2_dev_allocator_add(c, ca);
1406 bch2_recalc_capacity(c);
1408 return bch2_dev_allocator_start(ca);
1411 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1412 enum bch_member_state new_state, int flags)
1414 struct bch_sb_field_members *mi;
1417 if (ca->mi.state == new_state)
1420 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1423 if (new_state != BCH_MEMBER_STATE_rw)
1424 __bch2_dev_read_only(c, ca);
1426 bch_notice(ca, "%s", bch2_member_states[new_state]);
1428 mutex_lock(&c->sb_lock);
1429 mi = bch2_sb_get_members(c->disk_sb.sb);
1430 SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state);
1431 bch2_write_super(c);
1432 mutex_unlock(&c->sb_lock);
1434 if (new_state == BCH_MEMBER_STATE_rw)
1435 ret = __bch2_dev_read_write(c, ca);
1437 rebalance_wakeup(c);
1442 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1443 enum bch_member_state new_state, int flags)
1447 down_write(&c->state_lock);
1448 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1449 up_write(&c->state_lock);
1454 /* Device add/removal: */
1456 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
1458 struct btree_trans trans;
1462 bch2_trans_init(&trans, c, 0, 0);
1464 for (i = 0; i < ca->mi.nbuckets; i++) {
1465 ret = lockrestart_do(&trans,
1466 bch2_btree_key_cache_flush(&trans,
1467 BTREE_ID_alloc, POS(ca->dev_idx, i)));
1471 bch2_trans_exit(&trans);
1474 bch_err(c, "error %i removing dev alloc info", ret);
1478 return bch2_btree_delete_range(c, BTREE_ID_alloc,
1479 POS(ca->dev_idx, 0),
1480 POS(ca->dev_idx + 1, 0),
1484 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1486 struct bch_sb_field_members *mi;
1487 unsigned dev_idx = ca->dev_idx, data;
1490 down_write(&c->state_lock);
1493 * We consume a reference to ca->ref, regardless of whether we succeed
1496 percpu_ref_put(&ca->ref);
1498 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1499 bch_err(ca, "Cannot remove without losing data");
1503 __bch2_dev_read_only(c, ca);
1505 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1507 bch_err(ca, "Remove failed: error %i dropping data", ret);
1511 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1513 bch_err(ca, "Remove failed: error %i flushing journal", ret);
1517 ret = bch2_dev_remove_alloc(c, ca);
1519 bch_err(ca, "Remove failed, error deleting alloc info");
1524 * must flush all existing journal entries, they might have
1525 * (overwritten) keys that point to the device we're removing:
1527 bch2_journal_flush_all_pins(&c->journal);
1529 * hack to ensure bch2_replicas_gc2() clears out entries to this device
1531 bch2_journal_meta(&c->journal);
1532 ret = bch2_journal_error(&c->journal);
1534 bch_err(ca, "Remove failed, journal error");
1538 ret = bch2_replicas_gc2(c);
1540 bch_err(ca, "Remove failed: error %i from replicas gc", ret);
1544 data = bch2_dev_has_data(c, ca);
1546 char data_has_str[100];
1548 bch2_flags_to_text(&PBUF(data_has_str),
1549 bch2_data_types, data);
1550 bch_err(ca, "Remove failed, still has data (%s)", data_has_str);
1555 __bch2_dev_offline(c, ca);
1557 mutex_lock(&c->sb_lock);
1558 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1559 mutex_unlock(&c->sb_lock);
1561 percpu_ref_kill(&ca->ref);
1562 wait_for_completion(&ca->ref_completion);
1567 * Free this device's slot in the bch_member array - all pointers to
1568 * this device must be gone:
1570 mutex_lock(&c->sb_lock);
1571 mi = bch2_sb_get_members(c->disk_sb.sb);
1572 memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid));
1574 bch2_write_super(c);
1576 mutex_unlock(&c->sb_lock);
1577 up_write(&c->state_lock);
1579 bch2_dev_usage_journal_reserve(c);
1582 if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1583 !percpu_ref_is_zero(&ca->io_ref))
1584 __bch2_dev_read_write(c, ca);
1585 up_write(&c->state_lock);
1589 /* Add new device to running filesystem: */
1590 int bch2_dev_add(struct bch_fs *c, const char *path)
1592 struct bch_opts opts = bch2_opts_empty();
1593 struct bch_sb_handle sb;
1595 struct bch_dev *ca = NULL;
1596 struct bch_sb_field_members *mi;
1597 struct bch_member dev_mi;
1598 unsigned dev_idx, nr_devices, u64s;
1601 ret = bch2_read_super(path, &opts, &sb);
1603 bch_err(c, "device add error: error reading super: %i", ret);
1607 err = bch2_sb_validate(&sb);
1609 bch_err(c, "device add error: error validating super: %s", err);
1613 dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx];
1615 err = bch2_dev_may_add(sb.sb, c);
1617 bch_err(c, "device add error: %s", err);
1621 ca = __bch2_dev_alloc(c, &dev_mi);
1623 bch2_free_super(&sb);
1627 ret = __bch2_dev_attach_bdev(ca, &sb);
1633 ret = bch2_dev_journal_alloc(ca);
1635 bch_err(c, "device add error: journal alloc failed");
1639 down_write(&c->state_lock);
1640 mutex_lock(&c->sb_lock);
1642 ret = bch2_sb_from_fs(c, ca);
1644 bch_err(c, "device add error: new device superblock too small");
1648 mi = bch2_sb_get_members(ca->disk_sb.sb);
1650 if (!bch2_sb_resize_members(&ca->disk_sb,
1651 le32_to_cpu(mi->field.u64s) +
1652 sizeof(dev_mi) / sizeof(u64))) {
1653 bch_err(c, "device add error: new device superblock too small");
1658 if (dynamic_fault("bcachefs:add:no_slot"))
1661 mi = bch2_sb_get_members(c->disk_sb.sb);
1662 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1663 if (!bch2_dev_exists(c->disk_sb.sb, mi, dev_idx))
1666 bch_err(c, "device add error: already have maximum number of devices");
1671 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1672 u64s = (sizeof(struct bch_sb_field_members) +
1673 sizeof(struct bch_member) * nr_devices) / sizeof(u64);
1675 mi = bch2_sb_resize_members(&c->disk_sb, u64s);
1677 bch_err(c, "device add error: no room in superblock for member info");
1684 mi->members[dev_idx] = dev_mi;
1685 mi->members[dev_idx].last_mount = cpu_to_le64(ktime_get_real_seconds());
1686 c->disk_sb.sb->nr_devices = nr_devices;
1688 ca->disk_sb.sb->dev_idx = dev_idx;
1689 bch2_dev_attach(c, ca, dev_idx);
1691 bch2_write_super(c);
1692 mutex_unlock(&c->sb_lock);
1694 bch2_dev_usage_journal_reserve(c);
1696 ret = bch2_trans_mark_dev_sb(c, ca);
1698 bch_err(c, "device add error: error marking new superblock: %i", ret);
1702 ca->new_fs_bucket_idx = 0;
1704 if (ca->mi.state == BCH_MEMBER_STATE_rw) {
1705 ret = __bch2_dev_read_write(c, ca);
1707 bch_err(c, "device add error: error going RW on new device: %i", ret);
1712 up_write(&c->state_lock);
1716 mutex_unlock(&c->sb_lock);
1717 up_write(&c->state_lock);
1721 bch2_free_super(&sb);
1724 up_write(&c->state_lock);
1728 /* Hot add existing device to running filesystem: */
1729 int bch2_dev_online(struct bch_fs *c, const char *path)
1731 struct bch_opts opts = bch2_opts_empty();
1732 struct bch_sb_handle sb = { NULL };
1733 struct bch_sb_field_members *mi;
1739 down_write(&c->state_lock);
1741 ret = bch2_read_super(path, &opts, &sb);
1743 up_write(&c->state_lock);
1747 dev_idx = sb.sb->dev_idx;
1749 err = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
1751 bch_err(c, "error bringing %s online: %s", path, err);
1755 ret = bch2_dev_attach_bdev(c, &sb);
1759 ca = bch_dev_locked(c, dev_idx);
1761 ret = bch2_trans_mark_dev_sb(c, ca);
1763 bch_err(c, "error bringing %s online: error %i from bch2_trans_mark_dev_sb",
1768 if (ca->mi.state == BCH_MEMBER_STATE_rw) {
1769 ret = __bch2_dev_read_write(c, ca);
1774 mutex_lock(&c->sb_lock);
1775 mi = bch2_sb_get_members(c->disk_sb.sb);
1777 mi->members[ca->dev_idx].last_mount =
1778 cpu_to_le64(ktime_get_real_seconds());
1780 bch2_write_super(c);
1781 mutex_unlock(&c->sb_lock);
1783 up_write(&c->state_lock);
1786 up_write(&c->state_lock);
1787 bch2_free_super(&sb);
1791 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1793 down_write(&c->state_lock);
1795 if (!bch2_dev_is_online(ca)) {
1796 bch_err(ca, "Already offline");
1797 up_write(&c->state_lock);
1801 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1802 bch_err(ca, "Cannot offline required disk");
1803 up_write(&c->state_lock);
1807 __bch2_dev_offline(c, ca);
1809 up_write(&c->state_lock);
1813 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1815 struct bch_member *mi;
1818 down_write(&c->state_lock);
1820 if (nbuckets < ca->mi.nbuckets) {
1821 bch_err(ca, "Cannot shrink yet");
1826 if (bch2_dev_is_online(ca) &&
1827 get_capacity(ca->disk_sb.bdev->bd_disk) <
1828 ca->mi.bucket_size * nbuckets) {
1829 bch_err(ca, "New size larger than device");
1834 ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1836 bch_err(ca, "Resize error: %i", ret);
1840 ret = bch2_trans_mark_dev_sb(c, ca);
1845 mutex_lock(&c->sb_lock);
1846 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
1847 mi->nbuckets = cpu_to_le64(nbuckets);
1849 bch2_write_super(c);
1850 mutex_unlock(&c->sb_lock);
1852 bch2_recalc_capacity(c);
1854 up_write(&c->state_lock);
1858 /* return with ref on ca->ref: */
1859 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *path)
1866 ret = lookup_bdev(path, &dev);
1868 return ERR_PTR(ret);
1871 for_each_member_device_rcu(ca, c, i, NULL)
1872 if (ca->disk_sb.bdev->bd_dev == dev)
1874 ca = ERR_PTR(-ENOENT);
1881 /* Filesystem open: */
1883 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
1884 struct bch_opts opts)
1886 struct bch_sb_handle *sb = NULL;
1887 struct bch_fs *c = NULL;
1888 struct bch_sb_field_members *mi;
1889 unsigned i, best_sb = 0;
1893 pr_verbose_init(opts, "");
1896 c = ERR_PTR(-EINVAL);
1900 if (!try_module_get(THIS_MODULE)) {
1901 c = ERR_PTR(-ENODEV);
1905 sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1911 for (i = 0; i < nr_devices; i++) {
1912 ret = bch2_read_super(devices[i], &opts, &sb[i]);
1916 err = bch2_sb_validate(&sb[i]);
1921 for (i = 1; i < nr_devices; i++)
1922 if (le64_to_cpu(sb[i].sb->seq) >
1923 le64_to_cpu(sb[best_sb].sb->seq))
1926 mi = bch2_sb_get_members(sb[best_sb].sb);
1929 while (i < nr_devices) {
1931 !bch2_dev_exists(sb[best_sb].sb, mi, sb[i].sb->dev_idx)) {
1932 char buf[BDEVNAME_SIZE];
1933 pr_info("%s has been removed, skipping",
1934 bdevname(sb[i].bdev, buf));
1935 bch2_free_super(&sb[i]);
1936 array_remove_item(sb, nr_devices, i);
1940 err = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1946 c = bch2_fs_alloc(sb[best_sb].sb, opts);
1952 down_write(&c->state_lock);
1953 for (i = 0; i < nr_devices; i++) {
1954 ret = bch2_dev_attach_bdev(c, &sb[i]);
1956 up_write(&c->state_lock);
1960 up_write(&c->state_lock);
1962 err = "insufficient devices";
1963 if (!bch2_fs_may_start(c))
1966 if (!c->opts.nostart) {
1967 ret = bch2_fs_start(c);
1973 module_put(THIS_MODULE);
1975 pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
1978 pr_err("bch_fs_open err opening %s: %s",
1982 if (!IS_ERR_OR_NULL(c))
1985 for (i = 0; i < nr_devices; i++)
1986 bch2_free_super(&sb[i]);
1991 static const char *__bch2_fs_open_incremental(struct bch_sb_handle *sb,
1992 struct bch_opts opts)
1996 bool allocated_fs = false;
1999 err = bch2_sb_validate(sb);
2003 mutex_lock(&bch_fs_list_lock);
2004 c = __bch2_uuid_to_fs(sb->sb->uuid);
2006 closure_get(&c->cl);
2008 err = bch2_dev_in_fs(c->disk_sb.sb, sb->sb);
2012 allocated_fs = true;
2013 c = bch2_fs_alloc(sb->sb, opts);
2015 err = "bch2_fs_alloc() error";
2020 err = "bch2_dev_online() error";
2022 mutex_lock(&c->sb_lock);
2023 if (bch2_dev_attach_bdev(c, sb)) {
2024 mutex_unlock(&c->sb_lock);
2027 mutex_unlock(&c->sb_lock);
2029 if (!c->opts.nostart && bch2_fs_may_start(c)) {
2030 err = "error starting filesystem";
2031 ret = bch2_fs_start(c);
2036 closure_put(&c->cl);
2037 mutex_unlock(&bch_fs_list_lock);
2041 mutex_unlock(&bch_fs_list_lock);
2043 if (allocated_fs && !IS_ERR(c))
2046 closure_put(&c->cl);
2051 const char *bch2_fs_open_incremental(const char *path)
2053 struct bch_sb_handle sb;
2054 struct bch_opts opts = bch2_opts_empty();
2057 if (bch2_read_super(path, &opts, &sb))
2058 return "error reading superblock";
2060 err = __bch2_fs_open_incremental(&sb, opts);
2061 bch2_free_super(&sb);
2066 /* Global interfaces/init */
2068 static void bcachefs_exit(void)
2072 bch2_chardev_exit();
2073 bch2_btree_key_cache_exit();
2075 kset_unregister(bcachefs_kset);
2078 static int __init bcachefs_init(void)
2080 bch2_bkey_pack_test();
2082 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
2083 bch2_btree_key_cache_init() ||
2084 bch2_chardev_init() ||
2095 #define BCH_DEBUG_PARAM(name, description) \
2097 module_param_named(name, bch2_##name, bool, 0644); \
2098 MODULE_PARM_DESC(name, description);
2100 #undef BCH_DEBUG_PARAM
2102 module_exit(bcachefs_exit);
2103 module_init(bcachefs_init);