2 * bcachefs setup/teardown code, and some metadata io - read a superblock and
3 * figure out what to do with it.
5 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
6 * Copyright 2012 Google, Inc.
11 #include "btree_cache.h"
13 #include "btree_update.h"
35 #include <linux/backing-dev.h>
36 #include <linux/blkdev.h>
37 #include <linux/debugfs.h>
38 #include <linux/device.h>
39 #include <linux/genhd.h>
40 #include <linux/idr.h>
41 #include <linux/kthread.h>
42 #include <linux/module.h>
43 #include <linux/percpu.h>
44 #include <linux/random.h>
45 #include <linux/sysfs.h>
46 #include <crypto/hash.h>
48 #include <trace/events/bcachefs.h>
50 MODULE_LICENSE("GPL");
51 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
54 struct kobj_type type ## _ktype = { \
55 .release = type ## _release, \
56 .sysfs_ops = &type ## _sysfs_ops, \
57 .default_attrs = type ## _files \
60 static void bch2_fs_release(struct kobject *);
61 static void bch2_dev_release(struct kobject *);
63 static void bch2_fs_internal_release(struct kobject *k)
67 static void bch2_fs_opts_dir_release(struct kobject *k)
71 static void bch2_fs_time_stats_release(struct kobject *k)
75 static KTYPE(bch2_fs);
76 static KTYPE(bch2_fs_internal);
77 static KTYPE(bch2_fs_opts_dir);
78 static KTYPE(bch2_fs_time_stats);
79 static KTYPE(bch2_dev);
81 static struct kset *bcachefs_kset;
82 static LIST_HEAD(bch_fs_list);
83 static DEFINE_MUTEX(bch_fs_list_lock);
85 static DECLARE_WAIT_QUEUE_HEAD(bch_read_only_wait);
87 static void bch2_dev_free(struct bch_dev *);
88 static int bch2_dev_alloc(struct bch_fs *, unsigned);
89 static int bch2_dev_sysfs_online(struct bch_dev *);
90 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
92 struct bch_fs *bch2_bdev_to_fs(struct block_device *bdev)
98 mutex_lock(&bch_fs_list_lock);
101 list_for_each_entry(c, &bch_fs_list, list)
102 for_each_member_device_rcu(ca, c, i)
103 if (ca->disk_sb.bdev == bdev) {
110 mutex_unlock(&bch_fs_list_lock);
115 static struct bch_fs *__bch2_uuid_to_fs(uuid_le uuid)
119 lockdep_assert_held(&bch_fs_list_lock);
121 list_for_each_entry(c, &bch_fs_list, list)
122 if (!memcmp(&c->disk_sb->uuid, &uuid, sizeof(uuid_le)))
128 struct bch_fs *bch2_uuid_to_fs(uuid_le uuid)
132 mutex_lock(&bch_fs_list_lock);
133 c = __bch2_uuid_to_fs(uuid);
136 mutex_unlock(&bch_fs_list_lock);
141 int bch2_congested(struct bch_fs *c, int bdi_bits)
143 struct backing_dev_info *bdi;
148 if (bdi_bits & (1 << WB_sync_congested)) {
149 /* Reads - check all devices: */
150 for_each_readable_member(ca, c, i) {
151 bdi = blk_get_backing_dev_info(ca->disk_sb.bdev);
153 if (bdi_congested(bdi, bdi_bits)) {
159 /* Writes prefer fastest tier: */
160 struct bch_tier *tier = READ_ONCE(c->fastest_tier);
161 struct dev_group *grp = tier ? &tier->devs : &c->all_devs;
164 group_for_each_dev(ca, grp, i) {
165 bdi = blk_get_backing_dev_info(ca->disk_sb.bdev);
167 if (bdi_congested(bdi, bdi_bits)) {
178 static int bch2_congested_fn(void *data, int bdi_bits)
180 struct bch_fs *c = data;
182 return bch2_congested(c, bdi_bits);
185 /* Filesystem RO/RW: */
188 * For startup/shutdown of RW stuff, the dependencies are:
190 * - foreground writes depend on copygc and tiering (to free up space)
192 * - copygc and tiering 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)
207 bch2_tiering_stop(c);
209 for_each_member_device(ca, c, i)
210 bch2_moving_gc_stop(ca);
212 bch2_gc_thread_stop(c);
215 * Flush journal before stopping allocators, because flushing journal
216 * blacklist entries involves allocating new btree nodes:
218 bch2_journal_flush_pins(&c->journal, U64_MAX);
220 if (!bch2_journal_error(&c->journal))
221 bch2_btree_verify_flushed(c);
223 for_each_member_device(ca, c, i)
224 bch2_dev_allocator_stop(ca);
226 bch2_fs_journal_stop(&c->journal);
229 static void bch2_writes_disabled(struct percpu_ref *writes)
231 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
233 set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
234 wake_up(&bch_read_only_wait);
237 void bch2_fs_read_only(struct bch_fs *c)
239 mutex_lock(&c->state_lock);
240 if (c->state != BCH_FS_STARTING &&
241 c->state != BCH_FS_RW)
244 if (test_bit(BCH_FS_ERROR, &c->flags))
248 * Block new foreground-end write operations from starting - any new
249 * writes will return -EROFS:
251 * (This is really blocking new _allocations_, writes to previously
252 * allocated space can still happen until stopping the allocator in
253 * bch2_dev_allocator_stop()).
255 percpu_ref_kill(&c->writes);
257 del_timer(&c->foreground_write_wakeup);
258 cancel_delayed_work(&c->pd_controllers_update);
260 c->foreground_write_pd.rate.rate = UINT_MAX;
261 bch2_wake_delayed_writes((unsigned long) c);
264 * If we're not doing an emergency shutdown, we want to wait on
265 * outstanding writes to complete so they don't see spurious errors due
266 * to shutting down the allocator:
268 * If we are doing an emergency shutdown outstanding writes may
269 * hang until we shutdown the allocator so we don't want to wait
270 * on outstanding writes before shutting everything down - but
271 * we do need to wait on them before returning and signalling
272 * that going RO is complete:
274 wait_event(bch_read_only_wait,
275 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
276 test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
278 __bch2_fs_read_only(c);
280 wait_event(bch_read_only_wait,
281 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
283 clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
285 if (!bch2_journal_error(&c->journal) &&
286 !test_bit(BCH_FS_ERROR, &c->flags)) {
287 mutex_lock(&c->sb_lock);
288 SET_BCH_SB_CLEAN(c->disk_sb, true);
290 mutex_unlock(&c->sb_lock);
293 c->state = BCH_FS_RO;
295 mutex_unlock(&c->state_lock);
298 static void bch2_fs_read_only_work(struct work_struct *work)
301 container_of(work, struct bch_fs, read_only_work);
303 bch2_fs_read_only(c);
306 static void bch2_fs_read_only_async(struct bch_fs *c)
308 queue_work(system_long_wq, &c->read_only_work);
311 bool bch2_fs_emergency_read_only(struct bch_fs *c)
313 bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags);
315 bch2_fs_read_only_async(c);
316 bch2_journal_halt(&c->journal);
318 wake_up(&bch_read_only_wait);
322 const char *bch2_fs_read_write(struct bch_fs *c)
325 const char *err = NULL;
328 mutex_lock(&c->state_lock);
329 if (c->state != BCH_FS_STARTING &&
330 c->state != BCH_FS_RO)
333 err = "error starting allocator thread";
334 for_each_rw_member(ca, c, i)
335 if (bch2_dev_allocator_start(ca)) {
336 percpu_ref_put(&ca->io_ref);
340 err = "error starting btree GC thread";
341 if (bch2_gc_thread_start(c))
344 err = "error starting moving GC thread";
345 for_each_rw_member(ca, c, i)
346 if (bch2_moving_gc_start(ca)) {
347 percpu_ref_put(&ca->io_ref);
351 err = "error starting tiering thread";
352 if (bch2_tiering_start(c))
355 schedule_delayed_work(&c->pd_controllers_update, 5 * HZ);
357 if (c->state != BCH_FS_STARTING)
358 percpu_ref_reinit(&c->writes);
360 c->state = BCH_FS_RW;
363 mutex_unlock(&c->state_lock);
366 __bch2_fs_read_only(c);
370 /* Filesystem startup/shutdown: */
372 static void bch2_fs_free(struct bch_fs *c)
374 bch2_fs_encryption_exit(c);
375 bch2_fs_btree_exit(c);
376 bch2_fs_journal_exit(&c->journal);
377 bch2_io_clock_exit(&c->io_clock[WRITE]);
378 bch2_io_clock_exit(&c->io_clock[READ]);
379 bch2_fs_compress_exit(c);
380 bdi_destroy(&c->bdi);
381 lg_lock_free(&c->usage_lock);
382 free_percpu(c->usage_percpu);
383 mempool_exit(&c->btree_bounce_pool);
384 mempool_exit(&c->bio_bounce_pages);
385 bioset_exit(&c->bio_write);
386 bioset_exit(&c->bio_read_split);
387 bioset_exit(&c->bio_read);
388 bioset_exit(&c->btree_read_bio);
389 mempool_exit(&c->btree_interior_update_pool);
390 mempool_exit(&c->btree_reserve_pool);
391 mempool_exit(&c->fill_iter);
392 percpu_ref_exit(&c->writes);
395 destroy_workqueue(c->copygc_wq);
397 destroy_workqueue(c->wq);
399 free_pages((unsigned long) c->disk_sb, c->disk_sb_order);
401 module_put(THIS_MODULE);
404 static void bch2_fs_exit(struct bch_fs *c)
408 del_timer_sync(&c->foreground_write_wakeup);
409 cancel_delayed_work_sync(&c->pd_controllers_update);
410 cancel_work_sync(&c->read_only_work);
411 cancel_work_sync(&c->read_retry_work);
413 for (i = 0; i < c->sb.nr_devices; i++)
415 bch2_dev_free(c->devs[i]);
417 closure_debug_destroy(&c->cl);
418 kobject_put(&c->kobj);
421 static void bch2_fs_offline(struct bch_fs *c)
426 mutex_lock(&bch_fs_list_lock);
428 mutex_unlock(&bch_fs_list_lock);
430 for_each_member_device(ca, c, i)
431 if (ca->kobj.state_in_sysfs &&
433 sysfs_remove_link(&part_to_dev(ca->disk_sb.bdev->bd_part)->kobj,
436 if (c->kobj.state_in_sysfs)
437 kobject_del(&c->kobj);
439 bch2_fs_debug_exit(c);
440 bch2_fs_chardev_exit(c);
442 kobject_put(&c->time_stats);
443 kobject_put(&c->opts_dir);
444 kobject_put(&c->internal);
446 __bch2_fs_read_only(c);
449 static void bch2_fs_release(struct kobject *kobj)
451 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
456 void bch2_fs_stop(struct bch_fs *c)
458 mutex_lock(&c->state_lock);
459 BUG_ON(c->state == BCH_FS_STOPPING);
460 c->state = BCH_FS_STOPPING;
461 mutex_unlock(&c->state_lock);
465 closure_sync(&c->cl);
470 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
472 struct bch_sb_field_members *mi;
474 unsigned i, iter_size;
476 c = kzalloc(sizeof(struct bch_fs), GFP_KERNEL);
480 __module_get(THIS_MODULE);
484 mutex_init(&c->state_lock);
485 mutex_init(&c->sb_lock);
486 mutex_init(&c->btree_cache_lock);
487 mutex_init(&c->bucket_lock);
488 mutex_init(&c->btree_root_lock);
489 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
491 init_rwsem(&c->gc_lock);
493 #define BCH_TIME_STAT(name, frequency_units, duration_units) \
494 spin_lock_init(&c->name##_time.lock);
498 bch2_fs_allocator_init(c);
499 bch2_fs_tiering_init(c);
501 INIT_LIST_HEAD(&c->list);
502 INIT_LIST_HEAD(&c->btree_cache);
503 INIT_LIST_HEAD(&c->btree_cache_freeable);
504 INIT_LIST_HEAD(&c->btree_cache_freed);
506 INIT_LIST_HEAD(&c->btree_interior_update_list);
507 mutex_init(&c->btree_reserve_cache_lock);
508 mutex_init(&c->btree_interior_update_lock);
510 mutex_init(&c->bio_bounce_pages_lock);
511 bio_list_init(&c->read_retry_list);
512 spin_lock_init(&c->read_retry_lock);
513 INIT_WORK(&c->read_retry_work, bch2_read_retry_work);
514 mutex_init(&c->zlib_workspace_lock);
516 seqcount_init(&c->gc_pos_lock);
518 c->prio_clock[READ].hand = 1;
519 c->prio_clock[READ].min_prio = 0;
520 c->prio_clock[WRITE].hand = 1;
521 c->prio_clock[WRITE].min_prio = 0;
523 init_waitqueue_head(&c->writeback_wait);
524 c->writeback_pages_max = (256 << 10) / PAGE_SIZE;
526 c->copy_gc_enabled = 1;
527 c->tiering_enabled = 1;
528 c->tiering_percent = 10;
530 c->foreground_target_percent = 20;
532 c->journal.write_time = &c->journal_write_time;
533 c->journal.delay_time = &c->journal_delay_time;
534 c->journal.blocked_time = &c->journal_blocked_time;
535 c->journal.flush_seq_time = &c->journal_flush_seq_time;
537 mutex_lock(&c->sb_lock);
539 if (bch2_sb_to_fs(c, sb)) {
540 mutex_unlock(&c->sb_lock);
544 mutex_unlock(&c->sb_lock);
546 scnprintf(c->name, sizeof(c->name), "%pU", &c->sb.user_uuid);
548 bch2_opts_apply(&c->opts, bch2_sb_opts(sb));
549 bch2_opts_apply(&c->opts, opts);
551 c->opts.nochanges |= c->opts.noreplay;
552 c->opts.read_only |= c->opts.nochanges;
554 c->block_bits = ilog2(c->sb.block_size);
556 if (bch2_fs_init_fault("fs_alloc"))
559 iter_size = (btree_blocks(c) + 1) * 2 *
560 sizeof(struct btree_node_iter_set);
562 if (!(c->wq = alloc_workqueue("bcachefs",
563 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) ||
564 !(c->copygc_wq = alloc_workqueue("bcache_copygc",
565 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) ||
566 percpu_ref_init(&c->writes, bch2_writes_disabled, 0, GFP_KERNEL) ||
567 mempool_init_kmalloc_pool(&c->btree_reserve_pool, 1,
568 sizeof(struct btree_reserve)) ||
569 mempool_init_kmalloc_pool(&c->btree_interior_update_pool, 1,
570 sizeof(struct btree_interior_update)) ||
571 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
572 bioset_init(&c->btree_read_bio, 1, 0) ||
573 bioset_init(&c->bio_read, 1, offsetof(struct bch_read_bio, bio)) ||
574 bioset_init(&c->bio_read_split, 1, offsetof(struct bch_read_bio, bio)) ||
575 bioset_init(&c->bio_write, 1, offsetof(struct bch_write_bio, bio)) ||
576 mempool_init_page_pool(&c->bio_bounce_pages,
578 c->sb.btree_node_size,
579 BCH_ENCODED_EXTENT_MAX) /
581 !(c->usage_percpu = alloc_percpu(struct bch_fs_usage)) ||
582 lg_lock_init(&c->usage_lock) ||
583 mempool_init_page_pool(&c->btree_bounce_pool, 1,
584 ilog2(btree_pages(c))) ||
585 bdi_setup_and_register(&c->bdi, "bcachefs") ||
586 bch2_io_clock_init(&c->io_clock[READ]) ||
587 bch2_io_clock_init(&c->io_clock[WRITE]) ||
588 bch2_fs_journal_init(&c->journal) ||
589 bch2_fs_btree_init(c) ||
590 bch2_fs_encryption_init(c) ||
591 bch2_fs_compress_init(c) ||
592 bch2_check_set_has_compressed_data(c, c->opts.compression))
595 c->bdi.ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
596 c->bdi.congested_fn = bch2_congested_fn;
597 c->bdi.congested_data = c;
599 mi = bch2_sb_get_members(c->disk_sb);
600 for (i = 0; i < c->sb.nr_devices; i++)
601 if (!bch2_is_zero(mi->members[i].uuid.b, sizeof(uuid_le)) &&
602 bch2_dev_alloc(c, i))
606 * Now that all allocations have succeeded, init various refcounty
607 * things that let us shutdown:
609 closure_init(&c->cl, NULL);
611 c->kobj.kset = bcachefs_kset;
612 kobject_init(&c->kobj, &bch2_fs_ktype);
613 kobject_init(&c->internal, &bch2_fs_internal_ktype);
614 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
615 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
622 static const char *__bch2_fs_online(struct bch_fs *c)
625 const char *err = NULL;
629 lockdep_assert_held(&bch_fs_list_lock);
631 if (!list_empty(&c->list))
634 if (__bch2_uuid_to_fs(c->sb.uuid))
635 return "filesystem UUID already open";
637 ret = bch2_fs_chardev_init(c);
639 return "error creating character device";
641 bch2_fs_debug_init(c);
643 if (kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ||
644 kobject_add(&c->internal, &c->kobj, "internal") ||
645 kobject_add(&c->opts_dir, &c->kobj, "options") ||
646 kobject_add(&c->time_stats, &c->kobj, "time_stats"))
647 return "error creating sysfs objects";
649 mutex_lock(&c->state_lock);
651 err = "error creating sysfs objects";
652 __for_each_member_device(ca, c, i)
653 if (bch2_dev_sysfs_online(ca))
656 list_add(&c->list, &bch_fs_list);
659 mutex_unlock(&c->state_lock);
663 static const char *bch2_fs_online(struct bch_fs *c)
667 mutex_lock(&bch_fs_list_lock);
668 err = __bch2_fs_online(c);
669 mutex_unlock(&bch_fs_list_lock);
674 static const char *__bch2_fs_start(struct bch_fs *c)
676 const char *err = "cannot allocate memory";
677 struct bch_sb_field_members *mi;
685 BUG_ON(c->state != BCH_FS_STARTING);
687 mutex_lock(&c->sb_lock);
688 for_each_online_member(ca, c, i)
689 bch2_sb_from_fs(c, ca);
690 mutex_unlock(&c->sb_lock);
692 if (BCH_SB_INITIALIZED(c->disk_sb)) {
693 ret = bch2_journal_read(c, &journal);
697 j = &list_entry(journal.prev, struct journal_replay, list)->j;
699 c->prio_clock[READ].hand = le16_to_cpu(j->read_clock);
700 c->prio_clock[WRITE].hand = le16_to_cpu(j->write_clock);
702 err = "error reading priorities";
703 for_each_readable_member(ca, c, i) {
704 ret = bch2_prio_read(ca);
706 percpu_ref_put(&ca->io_ref);
711 for (id = 0; id < BTREE_ID_NR; id++) {
715 err = "bad btree root";
716 k = bch2_journal_find_btree_root(c, j, id, &level);
717 if (!k && id == BTREE_ID_EXTENTS)
720 pr_debug("missing btree root: %d", id);
724 err = "error reading btree root";
725 if (bch2_btree_root_read(c, id, k, level))
729 bch_verbose(c, "starting mark and sweep:");
731 err = "error in recovery";
732 ret = bch2_initial_gc(c, &journal);
736 if (c->opts.noreplay)
739 bch_verbose(c, "mark and sweep done");
742 * bch2_journal_start() can't happen sooner, or btree_gc_finish()
743 * will give spurious errors about oldest_gen > bucket_gen -
744 * this is a hack but oh well.
746 bch2_journal_start(c);
748 err = "error starting allocator thread";
749 for_each_rw_member(ca, c, i)
750 if (bch2_dev_allocator_start(ca)) {
751 percpu_ref_put(&ca->io_ref);
755 bch_verbose(c, "starting journal replay:");
757 err = "journal replay failed";
758 ret = bch2_journal_replay(c, &journal);
762 bch_verbose(c, "journal replay done");
764 if (c->opts.norecovery)
767 bch_verbose(c, "starting fsck:");
768 err = "error in fsck";
769 ret = bch2_fsck(c, !c->opts.nofsck);
773 for_each_rw_member(ca, c, i)
774 if (ca->need_prio_write) {
775 ret = bch2_prio_write(ca);
777 percpu_ref_put(&ca->io_ref);
782 bch_verbose(c, "fsck done");
784 struct bch_inode_unpacked inode;
785 struct bkey_inode_buf packed_inode;
788 closure_init_stack(&cl);
790 bch_notice(c, "initializing new filesystem");
792 ret = bch2_initial_gc(c, &journal);
796 err = "unable to allocate journal buckets";
797 for_each_rw_member(ca, c, i)
798 if (bch2_dev_journal_alloc(ca)) {
799 percpu_ref_put(&ca->io_ref);
804 * journal_res_get() will crash if called before this has
805 * set up the journal.pin FIFO and journal.cur pointer:
807 bch2_journal_start(c);
808 bch2_journal_set_replay_done(&c->journal);
810 err = "error starting allocator thread";
811 for_each_rw_member(ca, c, i)
812 if (bch2_dev_allocator_start(ca)) {
813 percpu_ref_put(&ca->io_ref);
817 err = "cannot allocate new btree root";
818 for (id = 0; id < BTREE_ID_NR; id++)
819 if (bch2_btree_root_alloc(c, id, &cl)) {
824 /* Wait for new btree roots to be written: */
827 bch2_inode_init(c, &inode, 0, 0,
828 S_IFDIR|S_IRWXU|S_IRUGO|S_IXUGO, 0);
829 inode.inum = BCACHE_ROOT_INO;
831 bch2_inode_pack(&packed_inode, &inode);
833 err = "error creating root directory";
834 if (bch2_btree_insert(c, BTREE_ID_INODES,
835 &packed_inode.inode.k_i,
836 NULL, NULL, NULL, 0))
839 err = "error writing first journal entry";
840 if (bch2_journal_meta(&c->journal))
844 err = "dynamic fault";
845 if (bch2_fs_init_fault("fs_start"))
848 if (c->opts.read_only) {
849 bch2_fs_read_only(c);
851 err = bch2_fs_read_write(c);
856 mutex_lock(&c->sb_lock);
857 mi = bch2_sb_get_members(c->disk_sb);
858 now = ktime_get_seconds();
860 for_each_member_device(ca, c, i)
861 mi->members[ca->dev_idx].last_mount = cpu_to_le64(now);
863 SET_BCH_SB_INITIALIZED(c->disk_sb, true);
864 SET_BCH_SB_CLEAN(c->disk_sb, false);
865 c->disk_sb->version = BCACHE_SB_VERSION_CDEV;
868 mutex_unlock(&c->sb_lock);
872 bch2_journal_entries_free(&journal);
876 case BCH_FSCK_ERRORS_NOT_FIXED:
877 bch_err(c, "filesystem contains errors: please report this to the developers");
878 pr_cont("mount with -o fix_errors to repair");
881 case BCH_FSCK_REPAIR_UNIMPLEMENTED:
882 bch_err(c, "filesystem contains errors: please report this to the developers");
883 pr_cont("repair unimplemented: inform the developers so that it can be added");
886 case BCH_FSCK_REPAIR_IMPOSSIBLE:
887 bch_err(c, "filesystem contains errors, but repair impossible");
890 case BCH_FSCK_UNKNOWN_VERSION:
891 err = "unknown metadata version";;
894 err = "cannot allocate memory";
902 set_bit(BCH_FS_ERROR, &c->flags);
906 const char *bch2_fs_start(struct bch_fs *c)
908 return __bch2_fs_start(c) ?: bch2_fs_online(c);
911 static const char *bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
913 struct bch_sb_field_members *sb_mi;
915 sb_mi = bch2_sb_get_members(sb);
917 return "Invalid superblock: member info area missing";
919 if (le16_to_cpu(sb->block_size) != c->sb.block_size)
920 return "mismatched block size";
922 if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <
923 BCH_SB_BTREE_NODE_SIZE(c->disk_sb))
924 return "new cache bucket size is too small";
929 static const char *bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
931 struct bch_sb *newest =
932 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
933 struct bch_sb_field_members *mi = bch2_sb_get_members(newest);
935 if (uuid_le_cmp(fs->uuid, sb->uuid))
936 return "device not a member of filesystem";
938 if (sb->dev_idx >= newest->nr_devices)
939 return "device has invalid dev_idx";
941 if (bch2_is_zero(mi->members[sb->dev_idx].uuid.b, sizeof(uuid_le)))
942 return "device has been removed";
944 if (fs->block_size != sb->block_size)
945 return "mismatched block size";
950 /* Device startup/shutdown: */
952 static void bch2_dev_release(struct kobject *kobj)
954 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
959 static void bch2_dev_free(struct bch_dev *ca)
963 cancel_work_sync(&ca->io_error_work);
965 if (ca->kobj.state_in_sysfs &&
967 sysfs_remove_link(&part_to_dev(ca->disk_sb.bdev->bd_part)->kobj,
970 if (ca->kobj.state_in_sysfs)
971 kobject_del(&ca->kobj);
973 bch2_free_super(&ca->disk_sb);
974 bch2_dev_journal_exit(ca);
976 free_percpu(ca->sectors_written);
977 bioset_exit(&ca->replica_set);
978 free_percpu(ca->usage_percpu);
979 kvpfree(ca->disk_buckets, bucket_bytes(ca));
980 kfree(ca->prio_buckets);
983 vfree(ca->oldest_gens);
984 free_heap(&ca->heap);
985 free_fifo(&ca->free_inc);
987 for (i = 0; i < RESERVE_NR; i++)
988 free_fifo(&ca->free[i]);
990 percpu_ref_exit(&ca->io_ref);
991 percpu_ref_exit(&ca->ref);
992 kobject_put(&ca->kobj);
995 static void bch2_dev_io_ref_release(struct percpu_ref *ref)
997 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
999 complete(&ca->offline_complete);
1002 static void __bch2_dev_offline(struct bch_dev *ca)
1004 struct bch_fs *c = ca->fs;
1006 lockdep_assert_held(&c->state_lock);
1008 __bch2_dev_read_only(ca->fs, ca);
1010 reinit_completion(&ca->offline_complete);
1011 percpu_ref_kill(&ca->io_ref);
1012 wait_for_completion(&ca->offline_complete);
1014 if (ca->kobj.state_in_sysfs) {
1015 struct kobject *block =
1016 &part_to_dev(ca->disk_sb.bdev->bd_part)->kobj;
1018 sysfs_remove_link(block, "bcachefs");
1019 sysfs_remove_link(&ca->kobj, "block");
1022 bch2_free_super(&ca->disk_sb);
1023 bch2_dev_journal_exit(ca);
1026 static void bch2_dev_ref_release(struct percpu_ref *ref)
1028 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1030 complete(&ca->stop_complete);
1033 static void bch2_dev_stop(struct bch_dev *ca)
1035 struct bch_fs *c = ca->fs;
1037 lockdep_assert_held(&c->state_lock);
1039 BUG_ON(rcu_access_pointer(c->devs[ca->dev_idx]) != ca);
1040 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1044 reinit_completion(&ca->stop_complete);
1045 percpu_ref_kill(&ca->ref);
1046 wait_for_completion(&ca->stop_complete);
1049 static int bch2_dev_sysfs_online(struct bch_dev *ca)
1051 struct bch_fs *c = ca->fs;
1054 if (!c->kobj.state_in_sysfs)
1057 if (!ca->kobj.state_in_sysfs) {
1058 ret = kobject_add(&ca->kobj, &ca->fs->kobj,
1059 "dev-%u", ca->dev_idx);
1064 if (ca->disk_sb.bdev) {
1065 struct kobject *block =
1066 &part_to_dev(ca->disk_sb.bdev->bd_part)->kobj;
1068 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1071 ret = sysfs_create_link(&ca->kobj, block, "block");
1079 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1081 struct bch_member *member;
1082 size_t reserve_none, movinggc_reserve, free_inc_reserve, total_reserve;
1087 if (bch2_fs_init_fault("dev_alloc"))
1090 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1094 kobject_init(&ca->kobj, &bch2_dev_ktype);
1095 init_completion(&ca->stop_complete);
1096 init_completion(&ca->offline_complete);
1098 spin_lock_init(&ca->self.lock);
1100 rcu_assign_pointer(ca->self.d[0].dev, ca);
1101 ca->dev_idx = dev_idx;
1103 spin_lock_init(&ca->freelist_lock);
1104 spin_lock_init(&ca->prio_buckets_lock);
1105 mutex_init(&ca->heap_lock);
1106 mutex_init(&ca->prio_write_lock);
1107 bch2_dev_moving_gc_init(ca);
1109 INIT_WORK(&ca->io_error_work, bch2_nonfatal_io_error_work);
1111 if (bch2_fs_init_fault("dev_alloc"))
1114 member = bch2_sb_get_members(c->disk_sb)->members + dev_idx;
1116 ca->mi = bch2_mi_to_cpu(member);
1117 ca->uuid = member->uuid;
1118 ca->bucket_bits = ilog2(ca->mi.bucket_size);
1119 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1121 /* XXX: tune these */
1122 movinggc_reserve = max_t(size_t, 16, ca->mi.nbuckets >> 7);
1123 reserve_none = max_t(size_t, 4, ca->mi.nbuckets >> 9);
1125 * free_inc must be smaller than the copygc reserve: if it was bigger,
1126 * one copygc iteration might not make enough buckets available to fill
1127 * up free_inc and allow the allocator to make forward progress
1129 free_inc_reserve = movinggc_reserve / 2;
1130 heap_size = movinggc_reserve * 8;
1132 if (percpu_ref_init(&ca->ref, bch2_dev_ref_release,
1134 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_release,
1135 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1136 !init_fifo(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) ||
1137 !init_fifo(&ca->free[RESERVE_BTREE], BTREE_NODE_RESERVE, GFP_KERNEL) ||
1138 !init_fifo(&ca->free[RESERVE_MOVINGGC],
1139 movinggc_reserve, GFP_KERNEL) ||
1140 !init_fifo(&ca->free[RESERVE_NONE], reserve_none, GFP_KERNEL) ||
1141 !init_fifo(&ca->free_inc, free_inc_reserve, GFP_KERNEL) ||
1142 !init_heap(&ca->heap, heap_size, GFP_KERNEL) ||
1143 !(ca->oldest_gens = vzalloc(sizeof(u8) *
1144 ca->mi.nbuckets)) ||
1145 !(ca->buckets = vzalloc(sizeof(struct bucket) *
1146 ca->mi.nbuckets)) ||
1147 !(ca->prio_buckets = kzalloc(sizeof(u64) * prio_buckets(ca) *
1149 !(ca->disk_buckets = kvpmalloc(bucket_bytes(ca), GFP_KERNEL)) ||
1150 !(ca->usage_percpu = alloc_percpu(struct bch_dev_usage)) ||
1151 !(ca->bio_prio = bio_kmalloc(GFP_NOIO, bucket_pages(ca))) ||
1152 bioset_init(&ca->replica_set, 4,
1153 offsetof(struct bch_write_bio, bio)) ||
1154 !(ca->sectors_written = alloc_percpu(*ca->sectors_written)))
1157 ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
1159 total_reserve = ca->free_inc.size;
1160 for (i = 0; i < RESERVE_NR; i++)
1161 total_reserve += ca->free[i].size;
1163 ca->copygc_write_point.group = &ca->self;
1164 ca->tiering_write_point.group = &ca->self;
1167 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1169 if (bch2_dev_sysfs_online(ca))
1170 pr_warn("error creating sysfs objects");
1178 static int __bch2_dev_online(struct bch_fs *c, struct bcache_superblock *sb)
1183 lockdep_assert_held(&c->sb_lock);
1185 if (le64_to_cpu(sb->sb->seq) >
1186 le64_to_cpu(c->disk_sb->seq))
1187 bch2_sb_to_fs(c, sb->sb);
1189 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1190 !c->devs[sb->sb->dev_idx]);
1192 ca = c->devs[sb->sb->dev_idx];
1193 if (ca->disk_sb.bdev) {
1194 bch_err(c, "already have device online in slot %u",
1199 ret = bch2_dev_journal_init(ca, sb->sb);
1204 * Increase journal write timeout if flushes to this device are
1207 if (!blk_queue_nonrot(bdev_get_queue(sb->bdev)) &&
1208 journal_flushes_device(ca))
1209 c->journal.write_delay_ms =
1210 max(c->journal.write_delay_ms, 1000U);
1214 if (sb->mode & FMODE_EXCL)
1215 ca->disk_sb.bdev->bd_holder = ca;
1216 memset(sb, 0, sizeof(*sb));
1218 if (c->sb.nr_devices == 1)
1219 bdevname(ca->disk_sb.bdev, c->name);
1220 bdevname(ca->disk_sb.bdev, ca->name);
1222 if (bch2_dev_sysfs_online(ca))
1223 pr_warn("error creating sysfs objects");
1225 lg_local_lock(&c->usage_lock);
1226 if (!gc_will_visit(c, gc_phase(GC_PHASE_SB_METADATA)))
1227 bch2_mark_dev_metadata(ca->fs, ca);
1228 lg_local_unlock(&c->usage_lock);
1230 percpu_ref_reinit(&ca->io_ref);
1234 /* Device management: */
1236 bool bch2_fs_may_start(struct bch_fs *c, int flags)
1238 struct bch_sb_field_members *mi;
1239 unsigned meta_missing = 0;
1240 unsigned data_missing = 0;
1241 bool degraded = false;
1244 mutex_lock(&c->sb_lock);
1245 mi = bch2_sb_get_members(c->disk_sb);
1247 for (i = 0; i < c->disk_sb->nr_devices; i++)
1249 !bch2_is_zero(mi->members[i].uuid.b, sizeof(uuid_le))) {
1251 if (BCH_MEMBER_HAS_METADATA(&mi->members[i]))
1253 if (BCH_MEMBER_HAS_DATA(&mi->members[i]))
1256 mutex_unlock(&c->sb_lock);
1259 !(flags & BCH_FORCE_IF_DEGRADED))
1263 !(flags & BCH_FORCE_IF_METADATA_DEGRADED))
1266 if (meta_missing >= BCH_SB_META_REPLICAS_HAVE(c->disk_sb) &&
1267 !(flags & BCH_FORCE_IF_METADATA_LOST))
1270 if (data_missing && !(flags & BCH_FORCE_IF_DATA_DEGRADED))
1273 if (data_missing >= BCH_SB_DATA_REPLICAS_HAVE(c->disk_sb) &&
1274 !(flags & BCH_FORCE_IF_DATA_LOST))
1281 * Note: this function is also used by the error paths - when a particular
1282 * device sees an error, we call it to determine whether we can just set the
1283 * device RO, or - if this function returns false - we'll set the whole
1286 * XXX: maybe we should be more explicit about whether we're changing state
1287 * because we got an error or what have you?
1289 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1290 enum bch_member_state new_state, int flags)
1292 lockdep_assert_held(&c->state_lock);
1294 if (new_state == BCH_MEMBER_STATE_RW)
1297 if (ca->mi.state == BCH_MEMBER_STATE_FAILED)
1301 * If the device is already offline - whatever is going on with it can't
1302 * possible make the FS need to go RO:
1304 if (!bch2_dev_is_online(ca))
1307 if (ca->mi.has_data &&
1308 !(flags & BCH_FORCE_IF_DATA_DEGRADED))
1311 if (ca->mi.has_data &&
1312 c->sb.data_replicas_have <= 1 &&
1313 !(flags & BCH_FORCE_IF_DATA_LOST))
1316 if (ca->mi.has_metadata &&
1317 !(flags & BCH_FORCE_IF_METADATA_DEGRADED))
1320 if (ca->mi.has_metadata &&
1321 c->sb.meta_replicas_have <= 1 &&
1322 !(flags & BCH_FORCE_IF_METADATA_LOST))
1328 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1330 bch2_moving_gc_stop(ca);
1333 * This stops new data writes (e.g. to existing open data
1334 * buckets) and then waits for all existing writes to
1337 bch2_dev_allocator_stop(ca);
1339 bch2_dev_group_remove(&c->journal.devs, ca);
1342 static const char *__bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1344 lockdep_assert_held(&c->state_lock);
1346 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_RW);
1348 if (bch2_dev_allocator_start(ca))
1349 return "error starting allocator thread";
1351 if (bch2_moving_gc_start(ca))
1352 return "error starting moving GC thread";
1354 if (bch2_tiering_start(c))
1355 return "error starting tiering thread";
1360 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1361 enum bch_member_state new_state, int flags)
1363 struct bch_sb_field_members *mi;
1365 if (ca->mi.state == new_state)
1368 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1371 if (new_state == BCH_MEMBER_STATE_RW) {
1372 if (__bch2_dev_read_write(c, ca))
1375 __bch2_dev_read_only(c, ca);
1378 bch_notice(ca, "%s", bch2_dev_state[new_state]);
1380 mutex_lock(&c->sb_lock);
1381 mi = bch2_sb_get_members(c->disk_sb);
1382 SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state);
1383 bch2_write_super(c);
1384 mutex_unlock(&c->sb_lock);
1389 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1390 enum bch_member_state new_state, int flags)
1394 mutex_lock(&c->state_lock);
1395 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1396 mutex_unlock(&c->state_lock);
1401 /* Device add/removal: */
1403 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1405 struct bch_sb_field_members *mi;
1406 unsigned dev_idx = ca->dev_idx;
1409 mutex_lock(&c->state_lock);
1411 percpu_ref_put(&ca->ref); /* XXX */
1413 if (ca->mi.state == BCH_MEMBER_STATE_RW) {
1414 bch_err(ca, "Cannot remove RW device");
1418 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) {
1419 bch_err(ca, "Cannot remove without losing data");
1424 * XXX: verify that dev_idx is really not in use anymore, anywhere
1426 * flag_data_bad() does not check btree pointers
1428 ret = bch2_flag_data_bad(ca);
1430 bch_err(ca, "Remove failed");
1434 if (ca->mi.has_data || ca->mi.has_metadata) {
1435 bch_err(ca, "Remove failed, still has data");
1440 * Ok, really doing the remove:
1441 * Drop device's prio pointer before removing it from superblock:
1443 spin_lock(&c->journal.lock);
1444 c->journal.prio_buckets[dev_idx] = 0;
1445 spin_unlock(&c->journal.lock);
1447 bch2_journal_meta(&c->journal);
1449 __bch2_dev_offline(ca);
1454 * Free this device's slot in the bch_member array - all pointers to
1455 * this device must be gone:
1457 mutex_lock(&c->sb_lock);
1458 mi = bch2_sb_get_members(c->disk_sb);
1459 memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid));
1461 bch2_write_super(c);
1463 mutex_unlock(&c->sb_lock);
1464 mutex_unlock(&c->state_lock);
1467 mutex_unlock(&c->state_lock);
1471 int bch2_dev_add(struct bch_fs *c, const char *path)
1473 struct bcache_superblock sb;
1475 struct bch_dev *ca = NULL;
1476 struct bch_sb_field_members *mi, *dev_mi;
1477 struct bch_member saved_mi;
1478 unsigned dev_idx, nr_devices, u64s;
1481 err = bch2_read_super(&sb, bch2_opts_empty(), path);
1485 err = bch2_validate_cache_super(&sb);
1489 err = bch2_dev_may_add(sb.sb, c);
1493 mutex_lock(&c->state_lock);
1494 mutex_lock(&c->sb_lock);
1497 * Preserve the old cache member information (esp. tier)
1498 * before we start bashing the disk stuff.
1500 dev_mi = bch2_sb_get_members(sb.sb);
1501 saved_mi = dev_mi->members[sb.sb->dev_idx];
1502 saved_mi.last_mount = cpu_to_le64(ktime_get_seconds());
1504 if (dynamic_fault("bcachefs:add:no_slot"))
1507 mi = bch2_sb_get_members(c->disk_sb);
1508 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1509 if (dev_idx >= c->sb.nr_devices ||
1510 bch2_is_zero(mi->members[dev_idx].uuid.b,
1514 err = "no slots available in superblock";
1519 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1520 u64s = (sizeof(struct bch_sb_field_members) +
1521 sizeof(struct bch_member) * nr_devices) / sizeof(u64);
1522 err = "no space in superblock for member info";
1524 mi = bch2_fs_sb_resize_members(c, u64s);
1528 dev_mi = bch2_sb_resize_members(&sb, u64s);
1532 memcpy(dev_mi, mi, u64s * sizeof(u64));
1533 dev_mi->members[dev_idx] = saved_mi;
1535 sb.sb->uuid = c->disk_sb->uuid;
1536 sb.sb->dev_idx = dev_idx;
1537 sb.sb->nr_devices = nr_devices;
1539 /* commit new member info */
1540 memcpy(mi, dev_mi, u64s * sizeof(u64));
1541 c->disk_sb->nr_devices = nr_devices;
1542 c->sb.nr_devices = nr_devices;
1544 if (bch2_dev_alloc(c, dev_idx)) {
1545 err = "cannot allocate memory";
1550 if (__bch2_dev_online(c, &sb)) {
1551 err = "bch2_dev_online() error";
1556 bch2_write_super(c);
1557 mutex_unlock(&c->sb_lock);
1559 ca = c->devs[dev_idx];
1560 if (ca->mi.state == BCH_MEMBER_STATE_RW) {
1561 err = "journal alloc failed";
1562 if (bch2_dev_journal_alloc(ca))
1565 err = __bch2_dev_read_write(c, ca);
1570 mutex_unlock(&c->state_lock);
1573 mutex_unlock(&c->sb_lock);
1575 mutex_unlock(&c->state_lock);
1576 bch2_free_super(&sb);
1578 bch_err(c, "Unable to add device: %s", err);
1579 return ret ?: -EINVAL;
1582 int bch2_dev_online(struct bch_fs *c, const char *path)
1584 struct bcache_superblock sb = { 0 };
1590 mutex_lock(&c->state_lock);
1592 err = bch2_read_super(&sb, bch2_opts_empty(), path);
1596 dev_idx = sb.sb->dev_idx;
1598 err = bch2_dev_in_fs(c->disk_sb, sb.sb);
1602 mutex_lock(&c->sb_lock);
1603 if (__bch2_dev_online(c, &sb)) {
1604 err = "__bch2_dev_online() error";
1605 mutex_unlock(&c->sb_lock);
1608 mutex_unlock(&c->sb_lock);
1610 ca = c->devs[dev_idx];
1611 ret = bch2_prio_read(ca);
1613 err = "error reading priorities";
1617 if (ca->mi.state == BCH_MEMBER_STATE_RW) {
1618 err = __bch2_dev_read_write(c, ca);
1623 mutex_unlock(&c->state_lock);
1626 mutex_unlock(&c->state_lock);
1627 bch2_free_super(&sb);
1628 bch_err(c, "error bringing %s online: %s", path, err);
1632 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1634 mutex_lock(&c->state_lock);
1636 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) {
1637 bch_err(ca, "Cannot offline required disk");
1638 mutex_unlock(&c->state_lock);
1642 __bch2_dev_read_only(c, ca);
1643 __bch2_dev_offline(ca);
1645 mutex_unlock(&c->state_lock);
1649 int bch2_dev_evacuate(struct bch_fs *c, struct bch_dev *ca)
1653 mutex_lock(&c->state_lock);
1655 if (ca->mi.state == BCH_MEMBER_STATE_RW) {
1656 bch_err(ca, "Cannot migrate data off RW device");
1657 mutex_unlock(&c->state_lock);
1661 mutex_unlock(&c->state_lock);
1663 ret = bch2_move_data_off_device(ca);
1665 bch_err(ca, "Error migrating data: %i", ret);
1669 ret = bch2_move_metadata_off_device(ca);
1671 bch_err(ca, "Error migrating metadata: %i", ret);
1675 if (ca->mi.has_data || ca->mi.has_metadata) {
1676 bch_err(ca, "Migrate error: data still present");
1683 /* Filesystem open: */
1685 const char *bch2_fs_open(char * const *devices, unsigned nr_devices,
1686 struct bch_opts opts, struct bch_fs **ret)
1689 struct bch_fs *c = NULL;
1690 struct bcache_superblock *sb;
1691 unsigned i, best_sb = 0;
1694 return "need at least one device";
1696 if (!try_module_get(THIS_MODULE))
1697 return "module unloading";
1699 err = "cannot allocate memory";
1700 sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1704 for (i = 0; i < nr_devices; i++) {
1705 err = bch2_read_super(&sb[i], opts, devices[i]);
1709 err = "attempting to register backing device";
1710 if (__SB_IS_BDEV(le64_to_cpu(sb[i].sb->version)))
1713 err = bch2_validate_cache_super(&sb[i]);
1718 for (i = 1; i < nr_devices; i++)
1719 if (le64_to_cpu(sb[i].sb->seq) >
1720 le64_to_cpu(sb[best_sb].sb->seq))
1723 for (i = 0; i < nr_devices; i++) {
1724 err = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1729 err = "cannot allocate memory";
1730 c = bch2_fs_alloc(sb[best_sb].sb, opts);
1734 err = "bch2_dev_online() error";
1735 mutex_lock(&c->sb_lock);
1736 for (i = 0; i < nr_devices; i++)
1737 if (__bch2_dev_online(c, &sb[i])) {
1738 mutex_unlock(&c->sb_lock);
1741 mutex_unlock(&c->sb_lock);
1743 err = "insufficient devices";
1744 if (!bch2_fs_may_start(c, 0))
1747 if (!c->opts.nostart) {
1748 err = __bch2_fs_start(c);
1753 err = bch2_fs_online(c);
1760 closure_put(&c->cl);
1765 module_put(THIS_MODULE);
1773 for (i = 0; i < nr_devices; i++)
1774 bch2_free_super(&sb[i]);
1778 static const char *__bch2_fs_open_incremental(struct bcache_superblock *sb,
1779 struct bch_opts opts)
1783 bool allocated_fs = false;
1785 err = bch2_validate_cache_super(sb);
1789 mutex_lock(&bch_fs_list_lock);
1790 c = __bch2_uuid_to_fs(sb->sb->uuid);
1792 closure_get(&c->cl);
1794 err = bch2_dev_in_fs(c->disk_sb, sb->sb);
1798 c = bch2_fs_alloc(sb->sb, opts);
1799 err = "cannot allocate memory";
1803 allocated_fs = true;
1806 err = "bch2_dev_online() error";
1808 mutex_lock(&c->sb_lock);
1809 if (__bch2_dev_online(c, sb)) {
1810 mutex_unlock(&c->sb_lock);
1813 mutex_unlock(&c->sb_lock);
1815 if (!c->opts.nostart && bch2_fs_may_start(c, 0)) {
1816 err = __bch2_fs_start(c);
1821 err = __bch2_fs_online(c);
1825 closure_put(&c->cl);
1826 mutex_unlock(&bch_fs_list_lock);
1830 mutex_unlock(&bch_fs_list_lock);
1835 closure_put(&c->cl);
1840 const char *bch2_fs_open_incremental(const char *path)
1842 struct bcache_superblock sb;
1843 struct bch_opts opts = bch2_opts_empty();
1846 err = bch2_read_super(&sb, opts, path);
1850 if (!__SB_IS_BDEV(le64_to_cpu(sb.sb->version)))
1851 err = __bch2_fs_open_incremental(&sb, opts);
1853 err = "not a bcachefs superblock";
1855 bch2_free_super(&sb);
1860 /* Global interfaces/init */
1862 static void bcachefs_exit(void)
1866 bch2_chardev_exit();
1868 kset_unregister(bcachefs_kset);
1871 static int __init bcachefs_init(void)
1873 bch2_bkey_pack_test();
1875 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
1876 bch2_chardev_init() ||
1887 #define BCH_DEBUG_PARAM(name, description) \
1889 module_param_named(name, bch2_##name, bool, 0644); \
1890 MODULE_PARM_DESC(name, description);
1892 #undef BCH_DEBUG_PARAM
1894 module_exit(bcachefs_exit);
1895 module_init(bcachefs_init);