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"
19 #include "buckets_waiting_for_journal.h"
25 #include "disk_groups.h"
35 #include "journal_reclaim.h"
36 #include "journal_seq_blacklist.h"
41 #include "rebalance.h"
44 #include "subvolume.h"
50 #include <linux/backing-dev.h>
51 #include <linux/blkdev.h>
52 #include <linux/debugfs.h>
53 #include <linux/device.h>
54 #include <linux/idr.h>
55 #include <linux/module.h>
56 #include <linux/percpu.h>
57 #include <linux/pretty-printers.h>
58 #include <linux/random.h>
59 #include <linux/sysfs.h>
60 #include <crypto/hash.h>
62 #include <trace/events/bcachefs.h>
64 MODULE_LICENSE("GPL");
65 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
68 static const struct attribute_group type ## _group = { \
69 .attrs = type ## _files \
72 static const struct attribute_group *type ## _groups[] = { \
77 static const struct kobj_type type ## _ktype = { \
78 .release = type ## _release, \
79 .sysfs_ops = &type ## _sysfs_ops, \
80 .default_groups = type ## _groups \
83 static void bch2_fs_release(struct kobject *);
84 static void bch2_dev_release(struct kobject *);
85 static void bch2_fs_counters_release(struct kobject *k)
89 static void bch2_fs_internal_release(struct kobject *k)
93 static void bch2_fs_opts_dir_release(struct kobject *k)
97 static void bch2_fs_time_stats_release(struct kobject *k)
102 KTYPE(bch2_fs_counters);
103 KTYPE(bch2_fs_internal);
104 KTYPE(bch2_fs_opts_dir);
105 KTYPE(bch2_fs_time_stats);
108 static struct kset *bcachefs_kset;
109 static LIST_HEAD(bch_fs_list);
110 static DEFINE_MUTEX(bch_fs_list_lock);
112 static DECLARE_WAIT_QUEUE_HEAD(bch_read_only_wait);
114 static void bch2_dev_free(struct bch_dev *);
115 static int bch2_dev_alloc(struct bch_fs *, unsigned);
116 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
117 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
119 struct bch_fs *bch2_dev_to_fs(dev_t dev)
125 mutex_lock(&bch_fs_list_lock);
128 list_for_each_entry(c, &bch_fs_list, list)
129 for_each_member_device_rcu(ca, c, i, NULL)
130 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
137 mutex_unlock(&bch_fs_list_lock);
142 static struct bch_fs *__bch2_uuid_to_fs(uuid_le uuid)
146 lockdep_assert_held(&bch_fs_list_lock);
148 list_for_each_entry(c, &bch_fs_list, list)
149 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid_le)))
155 struct bch_fs *bch2_uuid_to_fs(uuid_le uuid)
159 mutex_lock(&bch_fs_list_lock);
160 c = __bch2_uuid_to_fs(uuid);
163 mutex_unlock(&bch_fs_list_lock);
168 static void bch2_dev_usage_journal_reserve(struct bch_fs *c)
171 unsigned i, nr = 0, u64s =
172 ((sizeof(struct jset_entry_dev_usage) +
173 sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) /
177 for_each_member_device_rcu(ca, c, i, NULL)
181 bch2_journal_entry_res_resize(&c->journal,
182 &c->dev_usage_journal_res, u64s * nr);
185 /* Filesystem RO/RW: */
188 * For startup/shutdown of RW stuff, the dependencies are:
190 * - foreground writes depend on copygc and rebalance (to free up space)
192 * - copygc and rebalance depend on mark and sweep gc (they actually probably
193 * don't because they either reserve ahead of time or don't block if
194 * allocations fail, but allocations can require mark and sweep gc to run
195 * because of generation number wraparound)
197 * - all of the above depends on the allocator threads
199 * - allocator depends on the journal (when it rewrites prios and gens)
202 static void __bch2_fs_read_only(struct bch_fs *c)
205 unsigned i, clean_passes = 0;
208 bch2_rebalance_stop(c);
210 bch2_gc_thread_stop(c);
212 bch_verbose(c, "flushing journal and stopping allocators");
217 if (bch2_btree_interior_updates_flush(c) ||
218 bch2_journal_flush_all_pins(&c->journal) ||
219 bch2_btree_flush_all_writes(c) ||
220 seq != atomic64_read(&c->journal.seq)) {
221 seq = atomic64_read(&c->journal.seq);
224 } while (clean_passes < 2);
226 bch_verbose(c, "flushing journal and stopping allocators complete");
228 if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) &&
229 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
230 set_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
231 bch2_fs_journal_stop(&c->journal);
234 * After stopping journal:
236 for_each_member_device(ca, c, i)
237 bch2_dev_allocator_remove(c, ca);
240 static void bch2_writes_disabled(struct percpu_ref *writes)
242 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
244 set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
245 wake_up(&bch_read_only_wait);
248 void bch2_fs_read_only(struct bch_fs *c)
250 if (!test_bit(BCH_FS_RW, &c->flags)) {
251 bch2_journal_reclaim_stop(&c->journal);
255 BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
258 * Block new foreground-end write operations from starting - any new
259 * writes will return -EROFS:
261 percpu_ref_kill(&c->writes);
263 cancel_work_sync(&c->ec_stripe_delete_work);
266 * If we're not doing an emergency shutdown, we want to wait on
267 * outstanding writes to complete so they don't see spurious errors due
268 * to shutting down the allocator:
270 * If we are doing an emergency shutdown outstanding writes may
271 * hang until we shutdown the allocator so we don't want to wait
272 * on outstanding writes before shutting everything down - but
273 * we do need to wait on them before returning and signalling
274 * that going RO is complete:
276 wait_event(bch_read_only_wait,
277 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
278 test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
280 __bch2_fs_read_only(c);
282 wait_event(bch_read_only_wait,
283 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
285 clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
287 if (!bch2_journal_error(&c->journal) &&
288 !test_bit(BCH_FS_ERROR, &c->flags) &&
289 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) &&
290 test_bit(BCH_FS_STARTED, &c->flags) &&
291 test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags) &&
292 !c->opts.norecovery) {
293 bch_verbose(c, "marking filesystem clean");
294 bch2_fs_mark_clean(c);
297 clear_bit(BCH_FS_RW, &c->flags);
300 static void bch2_fs_read_only_work(struct work_struct *work)
303 container_of(work, struct bch_fs, read_only_work);
305 down_write(&c->state_lock);
306 bch2_fs_read_only(c);
307 up_write(&c->state_lock);
310 static void bch2_fs_read_only_async(struct bch_fs *c)
312 queue_work(system_long_wq, &c->read_only_work);
315 bool bch2_fs_emergency_read_only(struct bch_fs *c)
317 bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags);
319 bch2_journal_halt(&c->journal);
320 bch2_fs_read_only_async(c);
322 wake_up(&bch_read_only_wait);
326 static int bch2_fs_read_write_late(struct bch_fs *c)
330 ret = bch2_rebalance_start(c);
332 bch_err(c, "error starting rebalance thread");
339 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
345 if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) {
346 bch_err(c, "cannot go rw, unfixed btree errors");
350 if (test_bit(BCH_FS_RW, &c->flags))
354 * nochanges is used for fsck -n mode - we have to allow going rw
355 * during recovery for that to work:
357 if (c->opts.norecovery ||
358 (c->opts.nochanges &&
359 (!early || c->opts.read_only)))
362 bch_info(c, "going read-write");
364 ret = bch2_fs_mark_dirty(c);
368 clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
370 for_each_rw_member(ca, c, i)
371 bch2_dev_allocator_add(c, ca);
372 bch2_recalc_capacity(c);
374 ret = bch2_gc_thread_start(c);
376 bch_err(c, "error starting gc thread");
380 ret = bch2_copygc_start(c);
382 bch_err(c, "error starting copygc thread");
386 schedule_work(&c->ec_stripe_delete_work);
389 bch2_do_invalidates(c);
392 ret = bch2_fs_read_write_late(c);
397 percpu_ref_reinit(&c->writes);
398 set_bit(BCH_FS_RW, &c->flags);
399 set_bit(BCH_FS_WAS_RW, &c->flags);
402 __bch2_fs_read_only(c);
406 int bch2_fs_read_write(struct bch_fs *c)
408 return __bch2_fs_read_write(c, false);
411 int bch2_fs_read_write_early(struct bch_fs *c)
413 lockdep_assert_held(&c->state_lock);
415 return __bch2_fs_read_write(c, true);
418 /* Filesystem startup/shutdown: */
420 static void __bch2_fs_free(struct bch_fs *c)
425 for (i = 0; i < BCH_TIME_STAT_NR; i++)
426 bch2_time_stats_exit(&c->times[i]);
428 bch2_fs_counters_exit(c);
429 bch2_fs_snapshots_exit(c);
430 bch2_fs_quota_exit(c);
431 bch2_fs_fsio_exit(c);
433 bch2_fs_encryption_exit(c);
435 bch2_fs_buckets_waiting_for_journal_exit(c);
436 bch2_fs_btree_interior_update_exit(c);
437 bch2_fs_btree_iter_exit(c);
438 bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
439 bch2_fs_btree_cache_exit(c);
440 bch2_fs_replicas_exit(c);
441 bch2_fs_journal_exit(&c->journal);
442 bch2_io_clock_exit(&c->io_clock[WRITE]);
443 bch2_io_clock_exit(&c->io_clock[READ]);
444 bch2_fs_compress_exit(c);
445 bch2_journal_keys_free(&c->journal_keys);
446 bch2_journal_entries_free(c);
447 percpu_free_rwsem(&c->mark_lock);
449 if (c->btree_paths_bufs)
450 for_each_possible_cpu(cpu)
451 kfree(per_cpu_ptr(c->btree_paths_bufs, cpu)->path);
453 free_percpu(c->online_reserved);
454 free_percpu(c->btree_paths_bufs);
455 free_percpu(c->pcpu);
456 mempool_exit(&c->large_bkey_pool);
457 mempool_exit(&c->btree_bounce_pool);
458 bioset_exit(&c->btree_bio);
459 mempool_exit(&c->fill_iter);
460 percpu_ref_exit(&c->writes);
461 kfree(rcu_dereference_protected(c->disk_groups, 1));
462 kfree(c->journal_seq_blacklist_table);
463 kfree(c->unused_inode_hints);
464 free_heap(&c->copygc_heap);
466 if (c->io_complete_wq)
467 destroy_workqueue(c->io_complete_wq);
469 destroy_workqueue(c->copygc_wq);
470 if (c->btree_io_complete_wq)
471 destroy_workqueue(c->btree_io_complete_wq);
472 if (c->btree_update_wq)
473 destroy_workqueue(c->btree_update_wq);
475 bch2_free_super(&c->disk_sb);
476 kvpfree(c, sizeof(*c));
477 module_put(THIS_MODULE);
480 static void bch2_fs_release(struct kobject *kobj)
482 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
487 void __bch2_fs_stop(struct bch_fs *c)
492 bch_verbose(c, "shutting down");
494 set_bit(BCH_FS_STOPPING, &c->flags);
496 cancel_work_sync(&c->journal_seq_blacklist_gc_work);
498 down_write(&c->state_lock);
499 bch2_fs_read_only(c);
500 up_write(&c->state_lock);
502 for_each_member_device(ca, c, i)
503 if (ca->kobj.state_in_sysfs &&
505 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
507 if (c->kobj.state_in_sysfs)
508 kobject_del(&c->kobj);
510 bch2_fs_debug_exit(c);
511 bch2_fs_chardev_exit(c);
513 kobject_put(&c->counters_kobj);
514 kobject_put(&c->time_stats);
515 kobject_put(&c->opts_dir);
516 kobject_put(&c->internal);
518 /* btree prefetch might have kicked off reads in the background: */
519 bch2_btree_flush_all_reads(c);
521 for_each_member_device(ca, c, i)
522 cancel_work_sync(&ca->io_error_work);
524 cancel_work_sync(&c->read_only_work);
526 for (i = 0; i < c->sb.nr_devices; i++)
528 bch2_free_super(&c->devs[i]->disk_sb);
531 void bch2_fs_free(struct bch_fs *c)
535 mutex_lock(&bch_fs_list_lock);
537 mutex_unlock(&bch_fs_list_lock);
539 closure_sync(&c->cl);
540 closure_debug_destroy(&c->cl);
542 for (i = 0; i < c->sb.nr_devices; i++)
544 bch2_dev_free(rcu_dereference_protected(c->devs[i], 1));
546 bch_verbose(c, "shutdown complete");
548 kobject_put(&c->kobj);
551 void bch2_fs_stop(struct bch_fs *c)
557 static int bch2_fs_online(struct bch_fs *c)
563 lockdep_assert_held(&bch_fs_list_lock);
565 if (__bch2_uuid_to_fs(c->sb.uuid)) {
566 bch_err(c, "filesystem UUID already open");
570 ret = bch2_fs_chardev_init(c);
572 bch_err(c, "error creating character device");
576 bch2_fs_debug_init(c);
578 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
579 kobject_add(&c->internal, &c->kobj, "internal") ?:
580 kobject_add(&c->opts_dir, &c->kobj, "options") ?:
581 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
582 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
583 bch2_opts_create_sysfs_files(&c->opts_dir);
585 bch_err(c, "error creating sysfs objects");
589 down_write(&c->state_lock);
591 for_each_member_device(ca, c, i) {
592 ret = bch2_dev_sysfs_online(c, ca);
594 bch_err(c, "error creating sysfs objects");
595 percpu_ref_put(&ca->ref);
600 BUG_ON(!list_empty(&c->list));
601 list_add(&c->list, &bch_fs_list);
603 up_write(&c->state_lock);
607 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
609 struct bch_sb_field_members *mi;
611 struct printbuf name = PRINTBUF;
612 unsigned i, iter_size;
615 pr_verbose_init(opts, "");
617 c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
619 c = ERR_PTR(-ENOMEM);
623 __module_get(THIS_MODULE);
625 closure_init(&c->cl, NULL);
627 c->kobj.kset = bcachefs_kset;
628 kobject_init(&c->kobj, &bch2_fs_ktype);
629 kobject_init(&c->internal, &bch2_fs_internal_ktype);
630 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
631 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
632 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
635 c->disk_sb.fs_sb = true;
637 init_rwsem(&c->state_lock);
638 mutex_init(&c->sb_lock);
639 mutex_init(&c->replicas_gc_lock);
640 mutex_init(&c->btree_root_lock);
641 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
643 init_rwsem(&c->gc_lock);
644 mutex_init(&c->gc_gens_lock);
646 for (i = 0; i < BCH_TIME_STAT_NR; i++)
647 bch2_time_stats_init(&c->times[i]);
649 bch2_fs_copygc_init(c);
650 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
651 bch2_fs_allocator_background_init(c);
652 bch2_fs_allocator_foreground_init(c);
653 bch2_fs_rebalance_init(c);
654 bch2_fs_quota_init(c);
655 bch2_fs_ec_init_early(c);
657 INIT_LIST_HEAD(&c->list);
659 mutex_init(&c->usage_scratch_lock);
661 mutex_init(&c->bio_bounce_pages_lock);
662 mutex_init(&c->snapshot_table_lock);
664 spin_lock_init(&c->btree_write_error_lock);
666 INIT_WORK(&c->journal_seq_blacklist_gc_work,
667 bch2_blacklist_entries_gc);
669 INIT_LIST_HEAD(&c->journal_iters);
671 INIT_LIST_HEAD(&c->fsck_errors);
672 mutex_init(&c->fsck_error_lock);
674 INIT_LIST_HEAD(&c->ec_stripe_head_list);
675 mutex_init(&c->ec_stripe_head_lock);
677 INIT_LIST_HEAD(&c->ec_stripe_new_list);
678 mutex_init(&c->ec_stripe_new_lock);
680 INIT_LIST_HEAD(&c->data_progress_list);
681 mutex_init(&c->data_progress_lock);
683 spin_lock_init(&c->ec_stripes_heap_lock);
685 seqcount_init(&c->gc_pos_lock);
687 seqcount_init(&c->usage_lock);
689 c->copy_gc_enabled = 1;
690 c->rebalance.enabled = 1;
691 c->promote_whole_extents = true;
693 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write];
694 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write];
695 c->journal.blocked_time = &c->times[BCH_TIME_blocked_journal];
696 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
698 bch2_fs_btree_cache_init_early(&c->btree_cache);
700 mutex_init(&c->sectors_available_lock);
702 ret = percpu_init_rwsem(&c->mark_lock);
706 mutex_lock(&c->sb_lock);
707 ret = bch2_sb_to_fs(c, sb);
708 mutex_unlock(&c->sb_lock);
713 pr_uuid(&name, c->sb.user_uuid.b);
714 strscpy(c->name, name.buf, sizeof(c->name));
715 printbuf_exit(&name);
717 ret = name.allocation_failure ? -ENOMEM : 0;
722 if (sb->version <= bcachefs_metadata_version_inode_v2 &&
723 !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
724 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
726 if (sb->version <= bcachefs_metadata_version_inode_v2 &&
727 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
728 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
730 c->opts = bch2_opts_default;
731 ret = bch2_opts_from_sb(&c->opts, sb);
735 bch2_opts_apply(&c->opts, opts);
737 /* key cache currently disabled for inodes, because of snapshots: */
738 c->opts.inodes_use_key_cache = 0;
740 c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
741 if (c->opts.inodes_use_key_cache)
742 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
744 c->block_bits = ilog2(block_sectors(c));
745 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
747 if (bch2_fs_init_fault("fs_alloc")) {
748 bch_err(c, "fs_alloc fault injected");
753 iter_size = sizeof(struct sort_iter) +
754 (btree_blocks(c) + 1) * 2 *
755 sizeof(struct sort_iter_set);
757 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
759 if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
760 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
761 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
762 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
763 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
764 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
765 !(c->io_complete_wq = alloc_workqueue("bcachefs_io",
766 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) ||
767 percpu_ref_init(&c->writes, bch2_writes_disabled,
768 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
769 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
770 bioset_init(&c->btree_bio, 1,
771 max(offsetof(struct btree_read_bio, bio),
772 offsetof(struct btree_write_bio, wbio.bio)),
773 BIOSET_NEED_BVECS) ||
774 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
775 !(c->btree_paths_bufs = alloc_percpu(struct btree_path_buf)) ||
776 !(c->online_reserved = alloc_percpu(u64)) ||
777 mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
779 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
780 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
781 sizeof(u64), GFP_KERNEL))) {
786 ret = bch2_fs_counters_init(c) ?:
787 bch2_io_clock_init(&c->io_clock[READ]) ?:
788 bch2_io_clock_init(&c->io_clock[WRITE]) ?:
789 bch2_fs_journal_init(&c->journal) ?:
790 bch2_fs_replicas_init(c) ?:
791 bch2_fs_btree_cache_init(c) ?:
792 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
793 bch2_fs_btree_iter_init(c) ?:
794 bch2_fs_btree_interior_update_init(c) ?:
795 bch2_fs_buckets_waiting_for_journal_init(c) ?:
796 bch2_fs_subvolumes_init(c) ?:
797 bch2_fs_io_init(c) ?:
798 bch2_fs_encryption_init(c) ?:
799 bch2_fs_compress_init(c) ?:
800 bch2_fs_ec_init(c) ?:
801 bch2_fs_fsio_init(c);
805 mi = bch2_sb_get_members(c->disk_sb.sb);
806 for (i = 0; i < c->sb.nr_devices; i++)
807 if (bch2_dev_exists(c->disk_sb.sb, mi, i) &&
808 bch2_dev_alloc(c, i)) {
813 bch2_journal_entry_res_resize(&c->journal,
814 &c->btree_root_journal_res,
815 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
816 bch2_dev_usage_journal_reserve(c);
817 bch2_journal_entry_res_resize(&c->journal,
818 &c->clock_journal_res,
819 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
821 mutex_lock(&bch_fs_list_lock);
822 ret = bch2_fs_online(c);
823 mutex_unlock(&bch_fs_list_lock);
828 pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
837 static void print_mount_opts(struct bch_fs *c)
840 struct printbuf p = PRINTBUF;
843 if (c->opts.read_only) {
844 prt_printf(&p, "ro");
848 for (i = 0; i < bch2_opts_nr; i++) {
849 const struct bch_option *opt = &bch2_opt_table[i];
850 u64 v = bch2_opt_get_by_id(&c->opts, i);
852 if (!(opt->flags & OPT_MOUNT))
855 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
861 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);
865 prt_printf(&p, "(null)");
867 bch_info(c, "mounted version=%s opts=%s", bch2_metadata_versions[c->sb.version], p.buf);
871 int bch2_fs_start(struct bch_fs *c)
873 struct bch_sb_field_members *mi;
875 time64_t now = ktime_get_real_seconds();
879 down_write(&c->state_lock);
881 BUG_ON(test_bit(BCH_FS_STARTED, &c->flags));
883 mutex_lock(&c->sb_lock);
885 for_each_online_member(ca, c, i)
886 bch2_sb_from_fs(c, ca);
888 mi = bch2_sb_get_members(c->disk_sb.sb);
889 for_each_online_member(ca, c, i)
890 mi->members[ca->dev_idx].last_mount = cpu_to_le64(now);
892 mutex_unlock(&c->sb_lock);
894 for_each_rw_member(ca, c, i)
895 bch2_dev_allocator_add(c, ca);
896 bch2_recalc_capacity(c);
898 for (i = 0; i < BCH_TRANSACTIONS_NR; i++) {
899 mutex_lock(&c->btree_transaction_stats[i].lock);
900 bch2_time_stats_init(&c->btree_transaction_stats[i].lock_hold_times);
901 mutex_unlock(&c->btree_transaction_stats[i].lock);
904 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
905 ? bch2_fs_recovery(c)
906 : bch2_fs_initialize(c);
910 ret = bch2_opts_check_may_set(c);
914 if (bch2_fs_init_fault("fs_start")) {
915 bch_err(c, "fs_start fault injected");
920 set_bit(BCH_FS_STARTED, &c->flags);
922 if (c->opts.read_only || c->opts.nochanges) {
923 bch2_fs_read_only(c);
925 ret = !test_bit(BCH_FS_RW, &c->flags)
926 ? bch2_fs_read_write(c)
927 : bch2_fs_read_write_late(c);
935 up_write(&c->state_lock);
938 bch_err(c, "error starting filesystem: %s", bch2_err_str(ret));
942 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
944 struct bch_sb_field_members *sb_mi;
946 sb_mi = bch2_sb_get_members(sb);
948 return -BCH_ERR_member_info_missing;
950 if (le16_to_cpu(sb->block_size) != block_sectors(c))
951 return -BCH_ERR_mismatched_block_size;
953 if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <
954 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
955 return -BCH_ERR_bucket_size_too_small;
960 static int bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
962 struct bch_sb *newest =
963 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
964 struct bch_sb_field_members *mi = bch2_sb_get_members(newest);
966 if (uuid_le_cmp(fs->uuid, sb->uuid))
967 return -BCH_ERR_device_not_a_member_of_filesystem;
969 if (!bch2_dev_exists(newest, mi, sb->dev_idx))
970 return -BCH_ERR_device_has_been_removed;
972 if (fs->block_size != sb->block_size)
973 return -BCH_ERR_mismatched_block_size;
978 /* Device startup/shutdown: */
980 static void bch2_dev_release(struct kobject *kobj)
982 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
987 static void bch2_dev_free(struct bch_dev *ca)
989 cancel_work_sync(&ca->io_error_work);
991 if (ca->kobj.state_in_sysfs &&
993 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
995 if (ca->kobj.state_in_sysfs)
996 kobject_del(&ca->kobj);
998 bch2_free_super(&ca->disk_sb);
999 bch2_dev_journal_exit(ca);
1001 free_percpu(ca->io_done);
1002 bioset_exit(&ca->replica_set);
1003 bch2_dev_buckets_free(ca);
1004 free_page((unsigned long) ca->sb_read_scratch);
1006 bch2_time_stats_exit(&ca->io_latency[WRITE]);
1007 bch2_time_stats_exit(&ca->io_latency[READ]);
1009 percpu_ref_exit(&ca->io_ref);
1010 percpu_ref_exit(&ca->ref);
1011 kobject_put(&ca->kobj);
1014 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1017 lockdep_assert_held(&c->state_lock);
1019 if (percpu_ref_is_zero(&ca->io_ref))
1022 __bch2_dev_read_only(c, ca);
1024 reinit_completion(&ca->io_ref_completion);
1025 percpu_ref_kill(&ca->io_ref);
1026 wait_for_completion(&ca->io_ref_completion);
1028 if (ca->kobj.state_in_sysfs) {
1029 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1030 sysfs_remove_link(&ca->kobj, "block");
1033 bch2_free_super(&ca->disk_sb);
1034 bch2_dev_journal_exit(ca);
1037 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1039 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1041 complete(&ca->ref_completion);
1044 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1046 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1048 complete(&ca->io_ref_completion);
1051 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1055 if (!c->kobj.state_in_sysfs)
1058 if (!ca->kobj.state_in_sysfs) {
1059 ret = kobject_add(&ca->kobj, &c->kobj,
1060 "dev-%u", ca->dev_idx);
1065 if (ca->disk_sb.bdev) {
1066 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1068 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1072 ret = sysfs_create_link(&ca->kobj, block, "block");
1080 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1081 struct bch_member *member)
1085 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1089 kobject_init(&ca->kobj, &bch2_dev_ktype);
1090 init_completion(&ca->ref_completion);
1091 init_completion(&ca->io_ref_completion);
1093 init_rwsem(&ca->bucket_lock);
1095 INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1097 bch2_time_stats_init(&ca->io_latency[READ]);
1098 bch2_time_stats_init(&ca->io_latency[WRITE]);
1100 ca->mi = bch2_mi_to_cpu(member);
1101 ca->uuid = member->uuid;
1103 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
1104 ca->mi.bucket_size / btree_sectors(c));
1106 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
1108 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1109 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1110 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
1111 bch2_dev_buckets_alloc(c, ca) ||
1112 bioset_init(&ca->replica_set, 4,
1113 offsetof(struct bch_write_bio, bio), 0) ||
1114 !(ca->io_done = alloc_percpu(*ca->io_done)))
1123 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1126 ca->dev_idx = dev_idx;
1127 __set_bit(ca->dev_idx, ca->self.d);
1128 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1131 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1133 if (bch2_dev_sysfs_online(c, ca))
1134 pr_warn("error creating sysfs objects");
1137 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1139 struct bch_member *member =
1140 bch2_sb_get_members(c->disk_sb.sb)->members + dev_idx;
1141 struct bch_dev *ca = NULL;
1144 pr_verbose_init(c->opts, "");
1146 if (bch2_fs_init_fault("dev_alloc"))
1149 ca = __bch2_dev_alloc(c, member);
1155 bch2_dev_attach(c, ca, dev_idx);
1157 pr_verbose_init(c->opts, "ret %i", ret);
1166 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1170 if (bch2_dev_is_online(ca)) {
1171 bch_err(ca, "already have device online in slot %u",
1173 return -BCH_ERR_device_already_online;
1176 if (get_capacity(sb->bdev->bd_disk) <
1177 ca->mi.bucket_size * ca->mi.nbuckets) {
1178 bch_err(ca, "cannot online: device too small");
1179 return -BCH_ERR_device_size_too_small;
1182 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1184 ret = bch2_dev_journal_init(ca, sb->sb);
1190 if (sb->mode & FMODE_EXCL)
1191 ca->disk_sb.bdev->bd_holder = ca;
1192 memset(sb, 0, sizeof(*sb));
1194 ca->dev = ca->disk_sb.bdev->bd_dev;
1196 percpu_ref_reinit(&ca->io_ref);
1201 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1206 lockdep_assert_held(&c->state_lock);
1208 if (le64_to_cpu(sb->sb->seq) >
1209 le64_to_cpu(c->disk_sb.sb->seq))
1210 bch2_sb_to_fs(c, sb->sb);
1212 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1213 !c->devs[sb->sb->dev_idx]);
1215 ca = bch_dev_locked(c, sb->sb->dev_idx);
1217 ret = __bch2_dev_attach_bdev(ca, sb);
1221 bch2_dev_sysfs_online(c, ca);
1223 if (c->sb.nr_devices == 1)
1224 snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev);
1225 snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev);
1227 rebalance_wakeup(c);
1231 /* Device management: */
1234 * Note: this function is also used by the error paths - when a particular
1235 * device sees an error, we call it to determine whether we can just set the
1236 * device RO, or - if this function returns false - we'll set the whole
1239 * XXX: maybe we should be more explicit about whether we're changing state
1240 * because we got an error or what have you?
1242 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1243 enum bch_member_state new_state, int flags)
1245 struct bch_devs_mask new_online_devs;
1246 struct bch_dev *ca2;
1247 int i, nr_rw = 0, required;
1249 lockdep_assert_held(&c->state_lock);
1251 switch (new_state) {
1252 case BCH_MEMBER_STATE_rw:
1254 case BCH_MEMBER_STATE_ro:
1255 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1258 /* do we have enough devices to write to? */
1259 for_each_member_device(ca2, c, i)
1261 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1263 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1264 ? c->opts.metadata_replicas
1265 : c->opts.metadata_replicas_required,
1266 !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1267 ? c->opts.data_replicas
1268 : c->opts.data_replicas_required);
1270 return nr_rw >= required;
1271 case BCH_MEMBER_STATE_failed:
1272 case BCH_MEMBER_STATE_spare:
1273 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1274 ca->mi.state != BCH_MEMBER_STATE_ro)
1277 /* do we have enough devices to read from? */
1278 new_online_devs = bch2_online_devs(c);
1279 __clear_bit(ca->dev_idx, new_online_devs.d);
1281 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1287 static bool bch2_fs_may_start(struct bch_fs *c)
1289 struct bch_sb_field_members *mi;
1291 unsigned i, flags = 0;
1293 if (c->opts.very_degraded)
1294 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1296 if (c->opts.degraded)
1297 flags |= BCH_FORCE_IF_DEGRADED;
1299 if (!c->opts.degraded &&
1300 !c->opts.very_degraded) {
1301 mutex_lock(&c->sb_lock);
1302 mi = bch2_sb_get_members(c->disk_sb.sb);
1304 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1305 if (!bch2_dev_exists(c->disk_sb.sb, mi, i))
1308 ca = bch_dev_locked(c, i);
1310 if (!bch2_dev_is_online(ca) &&
1311 (ca->mi.state == BCH_MEMBER_STATE_rw ||
1312 ca->mi.state == BCH_MEMBER_STATE_ro)) {
1313 mutex_unlock(&c->sb_lock);
1317 mutex_unlock(&c->sb_lock);
1320 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1323 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1326 * The allocator thread itself allocates btree nodes, so stop it first:
1328 bch2_dev_allocator_remove(c, ca);
1329 bch2_dev_journal_stop(&c->journal, ca);
1332 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1334 lockdep_assert_held(&c->state_lock);
1336 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1338 bch2_dev_allocator_add(c, ca);
1339 bch2_recalc_capacity(c);
1342 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1343 enum bch_member_state new_state, int flags)
1345 struct bch_sb_field_members *mi;
1348 if (ca->mi.state == new_state)
1351 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1352 return -BCH_ERR_device_state_not_allowed;
1354 if (new_state != BCH_MEMBER_STATE_rw)
1355 __bch2_dev_read_only(c, ca);
1357 bch_notice(ca, "%s", bch2_member_states[new_state]);
1359 mutex_lock(&c->sb_lock);
1360 mi = bch2_sb_get_members(c->disk_sb.sb);
1361 SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state);
1362 bch2_write_super(c);
1363 mutex_unlock(&c->sb_lock);
1365 if (new_state == BCH_MEMBER_STATE_rw)
1366 __bch2_dev_read_write(c, ca);
1368 rebalance_wakeup(c);
1373 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1374 enum bch_member_state new_state, int flags)
1378 down_write(&c->state_lock);
1379 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1380 up_write(&c->state_lock);
1385 /* Device add/removal: */
1387 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
1389 struct bpos start = POS(ca->dev_idx, 0);
1390 struct bpos end = POS(ca->dev_idx, U64_MAX);
1394 * We clear the LRU and need_discard btrees first so that we don't race
1395 * with bch2_do_invalidates() and bch2_do_discards()
1397 ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end,
1398 BTREE_TRIGGER_NORUN, NULL) ?:
1399 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end,
1400 BTREE_TRIGGER_NORUN, NULL) ?:
1401 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end,
1402 BTREE_TRIGGER_NORUN, NULL) ?:
1403 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end,
1404 BTREE_TRIGGER_NORUN, NULL) ?:
1405 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end,
1406 BTREE_TRIGGER_NORUN, NULL);
1408 bch_err(c, "error removing dev alloc info: %s", bch2_err_str(ret));
1413 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1415 struct bch_sb_field_members *mi;
1416 unsigned dev_idx = ca->dev_idx, data;
1419 down_write(&c->state_lock);
1422 * We consume a reference to ca->ref, regardless of whether we succeed
1425 percpu_ref_put(&ca->ref);
1427 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1428 bch_err(ca, "Cannot remove without losing data");
1429 ret = -BCH_ERR_device_state_not_allowed;
1433 __bch2_dev_read_only(c, ca);
1435 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1437 bch_err(ca, "Remove failed: error dropping data: %s", bch2_err_str(ret));
1441 ret = bch2_dev_remove_alloc(c, ca);
1443 bch_err(ca, "Remove failed, error deleting alloc info");
1447 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1449 bch_err(ca, "Remove failed: error flushing journal: %s", bch2_err_str(ret));
1453 ret = bch2_journal_flush(&c->journal);
1455 bch_err(ca, "Remove failed, journal error");
1459 ret = bch2_replicas_gc2(c);
1461 bch_err(ca, "Remove failed: error from replicas gc: %s", bch2_err_str(ret));
1465 data = bch2_dev_has_data(c, ca);
1467 struct printbuf data_has = PRINTBUF;
1469 prt_bitflags(&data_has, bch2_data_types, data);
1470 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
1471 printbuf_exit(&data_has);
1476 __bch2_dev_offline(c, ca);
1478 mutex_lock(&c->sb_lock);
1479 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1480 mutex_unlock(&c->sb_lock);
1482 percpu_ref_kill(&ca->ref);
1483 wait_for_completion(&ca->ref_completion);
1488 * Free this device's slot in the bch_member array - all pointers to
1489 * this device must be gone:
1491 mutex_lock(&c->sb_lock);
1492 mi = bch2_sb_get_members(c->disk_sb.sb);
1493 memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid));
1495 bch2_write_super(c);
1497 mutex_unlock(&c->sb_lock);
1498 up_write(&c->state_lock);
1500 bch2_dev_usage_journal_reserve(c);
1503 if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1504 !percpu_ref_is_zero(&ca->io_ref))
1505 __bch2_dev_read_write(c, ca);
1506 up_write(&c->state_lock);
1510 /* Add new device to running filesystem: */
1511 int bch2_dev_add(struct bch_fs *c, const char *path)
1513 struct bch_opts opts = bch2_opts_empty();
1514 struct bch_sb_handle sb;
1515 struct bch_dev *ca = NULL;
1516 struct bch_sb_field_members *mi;
1517 struct bch_member dev_mi;
1518 unsigned dev_idx, nr_devices, u64s;
1519 struct printbuf errbuf = PRINTBUF;
1520 struct printbuf label = PRINTBUF;
1523 ret = bch2_read_super(path, &opts, &sb);
1525 bch_err(c, "device add error: error reading super: %s", bch2_err_str(ret));
1529 dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx];
1531 if (BCH_MEMBER_GROUP(&dev_mi)) {
1532 bch2_disk_path_to_text(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
1533 if (label.allocation_failure) {
1539 ret = bch2_dev_may_add(sb.sb, c);
1541 bch_err(c, "device add error: %s", bch2_err_str(ret));
1545 ca = __bch2_dev_alloc(c, &dev_mi);
1547 bch2_free_super(&sb);
1552 bch2_dev_usage_init(ca);
1554 ret = __bch2_dev_attach_bdev(ca, &sb);
1560 ret = bch2_dev_journal_alloc(ca);
1562 bch_err(c, "device add error: journal alloc failed");
1566 down_write(&c->state_lock);
1567 mutex_lock(&c->sb_lock);
1569 ret = bch2_sb_from_fs(c, ca);
1571 bch_err(c, "device add error: new device superblock too small");
1575 mi = bch2_sb_get_members(ca->disk_sb.sb);
1577 if (!bch2_sb_resize_members(&ca->disk_sb,
1578 le32_to_cpu(mi->field.u64s) +
1579 sizeof(dev_mi) / sizeof(u64))) {
1580 bch_err(c, "device add error: new device superblock too small");
1581 ret = -BCH_ERR_ENOSPC_sb_members;
1585 if (dynamic_fault("bcachefs:add:no_slot"))
1588 mi = bch2_sb_get_members(c->disk_sb.sb);
1589 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1590 if (!bch2_dev_exists(c->disk_sb.sb, mi, dev_idx))
1593 bch_err(c, "device add error: already have maximum number of devices");
1594 ret = -BCH_ERR_ENOSPC_sb_members;
1598 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1599 u64s = (sizeof(struct bch_sb_field_members) +
1600 sizeof(struct bch_member) * nr_devices) / sizeof(u64);
1602 mi = bch2_sb_resize_members(&c->disk_sb, u64s);
1604 bch_err(c, "device add error: no room in superblock for member info");
1605 ret = -BCH_ERR_ENOSPC_sb_members;
1611 mi->members[dev_idx] = dev_mi;
1612 mi->members[dev_idx].last_mount = cpu_to_le64(ktime_get_real_seconds());
1613 c->disk_sb.sb->nr_devices = nr_devices;
1615 ca->disk_sb.sb->dev_idx = dev_idx;
1616 bch2_dev_attach(c, ca, dev_idx);
1618 if (BCH_MEMBER_GROUP(&dev_mi)) {
1619 ret = __bch2_dev_group_set(c, ca, label.buf);
1621 bch_err(c, "device add error: error setting label");
1626 bch2_write_super(c);
1627 mutex_unlock(&c->sb_lock);
1629 bch2_dev_usage_journal_reserve(c);
1631 ret = bch2_trans_mark_dev_sb(c, ca);
1633 bch_err(c, "device add error: error marking new superblock: %s", bch2_err_str(ret));
1637 ret = bch2_fs_freespace_init(c);
1639 bch_err(c, "device add error: error initializing free space: %s", bch2_err_str(ret));
1643 ca->new_fs_bucket_idx = 0;
1645 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1646 __bch2_dev_read_write(c, ca);
1648 up_write(&c->state_lock);
1652 mutex_unlock(&c->sb_lock);
1653 up_write(&c->state_lock);
1657 bch2_free_super(&sb);
1658 printbuf_exit(&label);
1659 printbuf_exit(&errbuf);
1662 up_write(&c->state_lock);
1667 /* Hot add existing device to running filesystem: */
1668 int bch2_dev_online(struct bch_fs *c, const char *path)
1670 struct bch_opts opts = bch2_opts_empty();
1671 struct bch_sb_handle sb = { NULL };
1672 struct bch_sb_field_members *mi;
1677 down_write(&c->state_lock);
1679 ret = bch2_read_super(path, &opts, &sb);
1681 up_write(&c->state_lock);
1685 dev_idx = sb.sb->dev_idx;
1687 ret = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
1689 bch_err(c, "error bringing %s online: %s", path, bch2_err_str(ret));
1693 ret = bch2_dev_attach_bdev(c, &sb);
1697 ca = bch_dev_locked(c, dev_idx);
1699 ret = bch2_trans_mark_dev_sb(c, ca);
1701 bch_err(c, "error bringing %s online: error from bch2_trans_mark_dev_sb: %s",
1702 path, bch2_err_str(ret));
1706 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1707 __bch2_dev_read_write(c, ca);
1709 mutex_lock(&c->sb_lock);
1710 mi = bch2_sb_get_members(c->disk_sb.sb);
1712 mi->members[ca->dev_idx].last_mount =
1713 cpu_to_le64(ktime_get_real_seconds());
1715 bch2_write_super(c);
1716 mutex_unlock(&c->sb_lock);
1718 up_write(&c->state_lock);
1721 up_write(&c->state_lock);
1722 bch2_free_super(&sb);
1726 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1728 down_write(&c->state_lock);
1730 if (!bch2_dev_is_online(ca)) {
1731 bch_err(ca, "Already offline");
1732 up_write(&c->state_lock);
1736 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1737 bch_err(ca, "Cannot offline required disk");
1738 up_write(&c->state_lock);
1739 return -BCH_ERR_device_state_not_allowed;
1742 __bch2_dev_offline(c, ca);
1744 up_write(&c->state_lock);
1748 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1750 struct bch_member *mi;
1753 down_write(&c->state_lock);
1755 if (nbuckets < ca->mi.nbuckets) {
1756 bch_err(ca, "Cannot shrink yet");
1761 if (bch2_dev_is_online(ca) &&
1762 get_capacity(ca->disk_sb.bdev->bd_disk) <
1763 ca->mi.bucket_size * nbuckets) {
1764 bch_err(ca, "New size larger than device");
1765 ret = -BCH_ERR_device_size_too_small;
1769 ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1771 bch_err(ca, "Resize error: %s", bch2_err_str(ret));
1775 ret = bch2_trans_mark_dev_sb(c, ca);
1779 mutex_lock(&c->sb_lock);
1780 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
1781 mi->nbuckets = cpu_to_le64(nbuckets);
1783 bch2_write_super(c);
1784 mutex_unlock(&c->sb_lock);
1786 bch2_recalc_capacity(c);
1788 up_write(&c->state_lock);
1792 /* return with ref on ca->ref: */
1793 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
1799 for_each_member_device_rcu(ca, c, i, NULL)
1800 if (!strcmp(name, ca->name))
1802 ca = ERR_PTR(-ENOENT);
1809 /* Filesystem open: */
1811 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
1812 struct bch_opts opts)
1814 struct bch_sb_handle *sb = NULL;
1815 struct bch_fs *c = NULL;
1816 struct bch_sb_field_members *mi;
1817 unsigned i, best_sb = 0;
1818 struct printbuf errbuf = PRINTBUF;
1821 if (!try_module_get(THIS_MODULE))
1822 return ERR_PTR(-ENODEV);
1824 pr_verbose_init(opts, "");
1831 sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1837 for (i = 0; i < nr_devices; i++) {
1838 ret = bch2_read_super(devices[i], &opts, &sb[i]);
1844 for (i = 1; i < nr_devices; i++)
1845 if (le64_to_cpu(sb[i].sb->seq) >
1846 le64_to_cpu(sb[best_sb].sb->seq))
1849 mi = bch2_sb_get_members(sb[best_sb].sb);
1852 while (i < nr_devices) {
1854 !bch2_dev_exists(sb[best_sb].sb, mi, sb[i].sb->dev_idx)) {
1855 pr_info("%pg has been removed, skipping", sb[i].bdev);
1856 bch2_free_super(&sb[i]);
1857 array_remove_item(sb, nr_devices, i);
1861 ret = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1867 c = bch2_fs_alloc(sb[best_sb].sb, opts);
1873 down_write(&c->state_lock);
1874 for (i = 0; i < nr_devices; i++) {
1875 ret = bch2_dev_attach_bdev(c, &sb[i]);
1877 up_write(&c->state_lock);
1881 up_write(&c->state_lock);
1883 if (!bch2_fs_may_start(c)) {
1884 ret = -BCH_ERR_insufficient_devices_to_start;
1888 if (!c->opts.nostart) {
1889 ret = bch2_fs_start(c);
1895 printbuf_exit(&errbuf);
1896 module_put(THIS_MODULE);
1897 pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
1900 pr_err("bch_fs_open err opening %s: %s",
1901 devices[0], bch2_err_str(ret));
1903 if (!IS_ERR_OR_NULL(c))
1906 for (i = 0; i < nr_devices; i++)
1907 bch2_free_super(&sb[i]);
1912 /* Global interfaces/init */
1914 static void bcachefs_exit(void)
1918 bch2_chardev_exit();
1919 bch2_btree_key_cache_exit();
1921 kset_unregister(bcachefs_kset);
1924 static int __init bcachefs_init(void)
1926 bch2_bkey_pack_test();
1928 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
1929 bch2_btree_key_cache_init() ||
1930 bch2_chardev_init() ||
1941 #define BCH_DEBUG_PARAM(name, description) \
1943 module_param_named(name, bch2_##name, bool, 0644); \
1944 MODULE_PARM_DESC(name, description);
1946 #undef BCH_DEBUG_PARAM
1948 module_exit(bcachefs_exit);
1949 module_init(bcachefs_init);