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Update bcachefs sources to 7250b2ee5574 bcachefs: Fix deleted inodes btree in snapsho...
[bcachefs-tools-debian] / libbcachefs / super.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * bcachefs setup/teardown code, and some metadata io - read a superblock and
4  * figure out what to do with it.
5  *
6  * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
7  * Copyright 2012 Google, Inc.
8  */
9
10 #include "bcachefs.h"
11 #include "alloc_background.h"
12 #include "alloc_foreground.h"
13 #include "bkey_sort.h"
14 #include "btree_cache.h"
15 #include "btree_gc.h"
16 #include "btree_journal_iter.h"
17 #include "btree_key_cache.h"
18 #include "btree_update_interior.h"
19 #include "btree_io.h"
20 #include "btree_write_buffer.h"
21 #include "buckets_waiting_for_journal.h"
22 #include "chardev.h"
23 #include "checksum.h"
24 #include "clock.h"
25 #include "compress.h"
26 #include "counters.h"
27 #include "debug.h"
28 #include "disk_groups.h"
29 #include "ec.h"
30 #include "errcode.h"
31 #include "error.h"
32 #include "fs.h"
33 #include "fs-io.h"
34 #include "fs-io-buffered.h"
35 #include "fs-io-direct.h"
36 #include "fsck.h"
37 #include "inode.h"
38 #include "io_read.h"
39 #include "io_write.h"
40 #include "journal.h"
41 #include "journal_reclaim.h"
42 #include "journal_seq_blacklist.h"
43 #include "move.h"
44 #include "migrate.h"
45 #include "movinggc.h"
46 #include "nocow_locking.h"
47 #include "quota.h"
48 #include "rebalance.h"
49 #include "recovery.h"
50 #include "replicas.h"
51 #include "sb-clean.h"
52 #include "sb-errors.h"
53 #include "sb-members.h"
54 #include "snapshot.h"
55 #include "subvolume.h"
56 #include "super.h"
57 #include "super-io.h"
58 #include "sysfs.h"
59 #include "trace.h"
60
61 #include <linux/backing-dev.h>
62 #include <linux/blkdev.h>
63 #include <linux/debugfs.h>
64 #include <linux/device.h>
65 #include <linux/idr.h>
66 #include <linux/module.h>
67 #include <linux/percpu.h>
68 #include <linux/random.h>
69 #include <linux/sysfs.h>
70 #include <crypto/hash.h>
71
72 MODULE_LICENSE("GPL");
73 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
74 MODULE_DESCRIPTION("bcachefs filesystem");
75
76 #define KTYPE(type)                                                     \
77 static const struct attribute_group type ## _group = {                  \
78         .attrs = type ## _files                                         \
79 };                                                                      \
80                                                                         \
81 static const struct attribute_group *type ## _groups[] = {              \
82         &type ## _group,                                                \
83         NULL                                                            \
84 };                                                                      \
85                                                                         \
86 static const struct kobj_type type ## _ktype = {                        \
87         .release        = type ## _release,                             \
88         .sysfs_ops      = &type ## _sysfs_ops,                          \
89         .default_groups = type ## _groups                               \
90 }
91
92 static void bch2_fs_release(struct kobject *);
93 static void bch2_dev_release(struct kobject *);
94 static void bch2_fs_counters_release(struct kobject *k)
95 {
96 }
97
98 static void bch2_fs_internal_release(struct kobject *k)
99 {
100 }
101
102 static void bch2_fs_opts_dir_release(struct kobject *k)
103 {
104 }
105
106 static void bch2_fs_time_stats_release(struct kobject *k)
107 {
108 }
109
110 KTYPE(bch2_fs);
111 KTYPE(bch2_fs_counters);
112 KTYPE(bch2_fs_internal);
113 KTYPE(bch2_fs_opts_dir);
114 KTYPE(bch2_fs_time_stats);
115 KTYPE(bch2_dev);
116
117 static struct kset *bcachefs_kset;
118 static LIST_HEAD(bch_fs_list);
119 static DEFINE_MUTEX(bch_fs_list_lock);
120
121 DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);
122
123 static void bch2_dev_free(struct bch_dev *);
124 static int bch2_dev_alloc(struct bch_fs *, unsigned);
125 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
126 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
127
128 struct bch_fs *bch2_dev_to_fs(dev_t dev)
129 {
130         struct bch_fs *c;
131         struct bch_dev *ca;
132         unsigned i;
133
134         mutex_lock(&bch_fs_list_lock);
135         rcu_read_lock();
136
137         list_for_each_entry(c, &bch_fs_list, list)
138                 for_each_member_device_rcu(ca, c, i, NULL)
139                         if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
140                                 closure_get(&c->cl);
141                                 goto found;
142                         }
143         c = NULL;
144 found:
145         rcu_read_unlock();
146         mutex_unlock(&bch_fs_list_lock);
147
148         return c;
149 }
150
151 static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)
152 {
153         struct bch_fs *c;
154
155         lockdep_assert_held(&bch_fs_list_lock);
156
157         list_for_each_entry(c, &bch_fs_list, list)
158                 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))
159                         return c;
160
161         return NULL;
162 }
163
164 struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)
165 {
166         struct bch_fs *c;
167
168         mutex_lock(&bch_fs_list_lock);
169         c = __bch2_uuid_to_fs(uuid);
170         if (c)
171                 closure_get(&c->cl);
172         mutex_unlock(&bch_fs_list_lock);
173
174         return c;
175 }
176
177 static void bch2_dev_usage_journal_reserve(struct bch_fs *c)
178 {
179         struct bch_dev *ca;
180         unsigned i, nr = 0, u64s =
181                 ((sizeof(struct jset_entry_dev_usage) +
182                   sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) /
183                 sizeof(u64);
184
185         rcu_read_lock();
186         for_each_member_device_rcu(ca, c, i, NULL)
187                 nr++;
188         rcu_read_unlock();
189
190         bch2_journal_entry_res_resize(&c->journal,
191                         &c->dev_usage_journal_res, u64s * nr);
192 }
193
194 /* Filesystem RO/RW: */
195
196 /*
197  * For startup/shutdown of RW stuff, the dependencies are:
198  *
199  * - foreground writes depend on copygc and rebalance (to free up space)
200  *
201  * - copygc and rebalance depend on mark and sweep gc (they actually probably
202  *   don't because they either reserve ahead of time or don't block if
203  *   allocations fail, but allocations can require mark and sweep gc to run
204  *   because of generation number wraparound)
205  *
206  * - all of the above depends on the allocator threads
207  *
208  * - allocator depends on the journal (when it rewrites prios and gens)
209  */
210
211 static void __bch2_fs_read_only(struct bch_fs *c)
212 {
213         struct bch_dev *ca;
214         unsigned i, clean_passes = 0;
215         u64 seq = 0;
216
217         bch2_fs_ec_stop(c);
218         bch2_open_buckets_stop(c, NULL, true);
219         bch2_rebalance_stop(c);
220         bch2_copygc_stop(c);
221         bch2_gc_thread_stop(c);
222         bch2_fs_ec_flush(c);
223
224         bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",
225                     journal_cur_seq(&c->journal));
226
227         do {
228                 clean_passes++;
229
230                 if (bch2_btree_interior_updates_flush(c) ||
231                     bch2_journal_flush_all_pins(&c->journal) ||
232                     bch2_btree_flush_all_writes(c) ||
233                     seq != atomic64_read(&c->journal.seq)) {
234                         seq = atomic64_read(&c->journal.seq);
235                         clean_passes = 0;
236                 }
237         } while (clean_passes < 2);
238
239         bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu",
240                     journal_cur_seq(&c->journal));
241
242         if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) &&
243             !test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
244                 set_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
245         bch2_fs_journal_stop(&c->journal);
246
247         /*
248          * After stopping journal:
249          */
250         for_each_member_device(ca, c, i)
251                 bch2_dev_allocator_remove(c, ca);
252 }
253
254 #ifndef BCH_WRITE_REF_DEBUG
255 static void bch2_writes_disabled(struct percpu_ref *writes)
256 {
257         struct bch_fs *c = container_of(writes, struct bch_fs, writes);
258
259         set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
260         wake_up(&bch2_read_only_wait);
261 }
262 #endif
263
264 void bch2_fs_read_only(struct bch_fs *c)
265 {
266         if (!test_bit(BCH_FS_RW, &c->flags)) {
267                 bch2_journal_reclaim_stop(&c->journal);
268                 return;
269         }
270
271         BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
272
273         /*
274          * Block new foreground-end write operations from starting - any new
275          * writes will return -EROFS:
276          */
277         set_bit(BCH_FS_GOING_RO, &c->flags);
278 #ifndef BCH_WRITE_REF_DEBUG
279         percpu_ref_kill(&c->writes);
280 #else
281         for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
282                 bch2_write_ref_put(c, i);
283 #endif
284
285         /*
286          * If we're not doing an emergency shutdown, we want to wait on
287          * outstanding writes to complete so they don't see spurious errors due
288          * to shutting down the allocator:
289          *
290          * If we are doing an emergency shutdown outstanding writes may
291          * hang until we shutdown the allocator so we don't want to wait
292          * on outstanding writes before shutting everything down - but
293          * we do need to wait on them before returning and signalling
294          * that going RO is complete:
295          */
296         wait_event(bch2_read_only_wait,
297                    test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
298                    test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
299
300         __bch2_fs_read_only(c);
301
302         wait_event(bch2_read_only_wait,
303                    test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
304
305         clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
306         clear_bit(BCH_FS_GOING_RO, &c->flags);
307
308         if (!bch2_journal_error(&c->journal) &&
309             !test_bit(BCH_FS_ERROR, &c->flags) &&
310             !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) &&
311             test_bit(BCH_FS_STARTED, &c->flags) &&
312             test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags) &&
313             !c->opts.norecovery) {
314                 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal));
315                 BUG_ON(atomic_read(&c->btree_cache.dirty));
316                 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty));
317                 BUG_ON(c->btree_write_buffer.state.nr);
318
319                 bch_verbose(c, "marking filesystem clean");
320                 bch2_fs_mark_clean(c);
321         }
322
323         clear_bit(BCH_FS_RW, &c->flags);
324 }
325
326 static void bch2_fs_read_only_work(struct work_struct *work)
327 {
328         struct bch_fs *c =
329                 container_of(work, struct bch_fs, read_only_work);
330
331         down_write(&c->state_lock);
332         bch2_fs_read_only(c);
333         up_write(&c->state_lock);
334 }
335
336 static void bch2_fs_read_only_async(struct bch_fs *c)
337 {
338         queue_work(system_long_wq, &c->read_only_work);
339 }
340
341 bool bch2_fs_emergency_read_only(struct bch_fs *c)
342 {
343         bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags);
344
345         bch2_journal_halt(&c->journal);
346         bch2_fs_read_only_async(c);
347
348         wake_up(&bch2_read_only_wait);
349         return ret;
350 }
351
352 static int bch2_fs_read_write_late(struct bch_fs *c)
353 {
354         int ret;
355
356         /*
357          * Data move operations can't run until after check_snapshots has
358          * completed, and bch2_snapshot_is_ancestor() is available.
359          *
360          * Ideally we'd start copygc/rebalance earlier instead of waiting for
361          * all of recovery/fsck to complete:
362          */
363         ret = bch2_copygc_start(c);
364         if (ret) {
365                 bch_err(c, "error starting copygc thread");
366                 return ret;
367         }
368
369         ret = bch2_rebalance_start(c);
370         if (ret) {
371                 bch_err(c, "error starting rebalance thread");
372                 return ret;
373         }
374
375         return 0;
376 }
377
378 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
379 {
380         struct bch_dev *ca;
381         unsigned i;
382         int ret;
383
384         if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) {
385                 bch_err(c, "cannot go rw, unfixed btree errors");
386                 return -BCH_ERR_erofs_unfixed_errors;
387         }
388
389         if (test_bit(BCH_FS_RW, &c->flags))
390                 return 0;
391
392         if (c->opts.norecovery)
393                 return -BCH_ERR_erofs_norecovery;
394
395         /*
396          * nochanges is used for fsck -n mode - we have to allow going rw
397          * during recovery for that to work:
398          */
399         if (c->opts.nochanges && (!early || c->opts.read_only))
400                 return -BCH_ERR_erofs_nochanges;
401
402         bch_info(c, "going read-write");
403
404         ret = bch2_sb_members_v2_init(c);
405         if (ret)
406                 goto err;
407
408         ret = bch2_fs_mark_dirty(c);
409         if (ret)
410                 goto err;
411
412         clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
413
414         /*
415          * First journal write must be a flush write: after a clean shutdown we
416          * don't read the journal, so the first journal write may end up
417          * overwriting whatever was there previously, and there must always be
418          * at least one non-flush write in the journal or recovery will fail:
419          */
420         set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags);
421
422         for_each_rw_member(ca, c, i)
423                 bch2_dev_allocator_add(c, ca);
424         bch2_recalc_capacity(c);
425
426         ret = bch2_gc_thread_start(c);
427         if (ret) {
428                 bch_err(c, "error starting gc thread");
429                 return ret;
430         }
431
432         ret = bch2_journal_reclaim_start(&c->journal);
433         if (ret)
434                 goto err;
435
436         if (!early) {
437                 ret = bch2_fs_read_write_late(c);
438                 if (ret)
439                         goto err;
440         }
441
442 #ifndef BCH_WRITE_REF_DEBUG
443         percpu_ref_reinit(&c->writes);
444 #else
445         for (i = 0; i < BCH_WRITE_REF_NR; i++) {
446                 BUG_ON(atomic_long_read(&c->writes[i]));
447                 atomic_long_inc(&c->writes[i]);
448         }
449 #endif
450         set_bit(BCH_FS_RW, &c->flags);
451         set_bit(BCH_FS_WAS_RW, &c->flags);
452
453         bch2_do_discards(c);
454         bch2_do_invalidates(c);
455         bch2_do_stripe_deletes(c);
456         bch2_do_pending_node_rewrites(c);
457         return 0;
458 err:
459         __bch2_fs_read_only(c);
460         return ret;
461 }
462
463 int bch2_fs_read_write(struct bch_fs *c)
464 {
465         return __bch2_fs_read_write(c, false);
466 }
467
468 int bch2_fs_read_write_early(struct bch_fs *c)
469 {
470         lockdep_assert_held(&c->state_lock);
471
472         return __bch2_fs_read_write(c, true);
473 }
474
475 /* Filesystem startup/shutdown: */
476
477 static void __bch2_fs_free(struct bch_fs *c)
478 {
479         unsigned i;
480
481         for (i = 0; i < BCH_TIME_STAT_NR; i++)
482                 bch2_time_stats_exit(&c->times[i]);
483
484         bch2_free_pending_node_rewrites(c);
485         bch2_fs_sb_errors_exit(c);
486         bch2_fs_counters_exit(c);
487         bch2_fs_snapshots_exit(c);
488         bch2_fs_quota_exit(c);
489         bch2_fs_fs_io_direct_exit(c);
490         bch2_fs_fs_io_buffered_exit(c);
491         bch2_fs_fsio_exit(c);
492         bch2_fs_ec_exit(c);
493         bch2_fs_encryption_exit(c);
494         bch2_fs_nocow_locking_exit(c);
495         bch2_fs_io_write_exit(c);
496         bch2_fs_io_read_exit(c);
497         bch2_fs_buckets_waiting_for_journal_exit(c);
498         bch2_fs_btree_interior_update_exit(c);
499         bch2_fs_btree_iter_exit(c);
500         bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
501         bch2_fs_btree_cache_exit(c);
502         bch2_fs_replicas_exit(c);
503         bch2_fs_journal_exit(&c->journal);
504         bch2_io_clock_exit(&c->io_clock[WRITE]);
505         bch2_io_clock_exit(&c->io_clock[READ]);
506         bch2_fs_compress_exit(c);
507         bch2_journal_keys_free(&c->journal_keys);
508         bch2_journal_entries_free(c);
509         bch2_fs_btree_write_buffer_exit(c);
510         percpu_free_rwsem(&c->mark_lock);
511         free_percpu(c->online_reserved);
512
513         darray_exit(&c->btree_roots_extra);
514         free_percpu(c->pcpu);
515         mempool_exit(&c->large_bkey_pool);
516         mempool_exit(&c->btree_bounce_pool);
517         bioset_exit(&c->btree_bio);
518         mempool_exit(&c->fill_iter);
519 #ifndef BCH_WRITE_REF_DEBUG
520         percpu_ref_exit(&c->writes);
521 #endif
522         kfree(rcu_dereference_protected(c->disk_groups, 1));
523         kfree(c->journal_seq_blacklist_table);
524         kfree(c->unused_inode_hints);
525
526         if (c->write_ref_wq)
527                 destroy_workqueue(c->write_ref_wq);
528         if (c->io_complete_wq)
529                 destroy_workqueue(c->io_complete_wq);
530         if (c->copygc_wq)
531                 destroy_workqueue(c->copygc_wq);
532         if (c->btree_io_complete_wq)
533                 destroy_workqueue(c->btree_io_complete_wq);
534         if (c->btree_update_wq)
535                 destroy_workqueue(c->btree_update_wq);
536
537         bch2_free_super(&c->disk_sb);
538         kvpfree(c, sizeof(*c));
539         module_put(THIS_MODULE);
540 }
541
542 static void bch2_fs_release(struct kobject *kobj)
543 {
544         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
545
546         __bch2_fs_free(c);
547 }
548
549 void __bch2_fs_stop(struct bch_fs *c)
550 {
551         struct bch_dev *ca;
552         unsigned i;
553
554         bch_verbose(c, "shutting down");
555
556         set_bit(BCH_FS_STOPPING, &c->flags);
557
558         cancel_work_sync(&c->journal_seq_blacklist_gc_work);
559
560         down_write(&c->state_lock);
561         bch2_fs_read_only(c);
562         up_write(&c->state_lock);
563
564         for_each_member_device(ca, c, i)
565                 if (ca->kobj.state_in_sysfs &&
566                     ca->disk_sb.bdev)
567                         sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
568
569         if (c->kobj.state_in_sysfs)
570                 kobject_del(&c->kobj);
571
572         bch2_fs_debug_exit(c);
573         bch2_fs_chardev_exit(c);
574
575         kobject_put(&c->counters_kobj);
576         kobject_put(&c->time_stats);
577         kobject_put(&c->opts_dir);
578         kobject_put(&c->internal);
579
580         /* btree prefetch might have kicked off reads in the background: */
581         bch2_btree_flush_all_reads(c);
582
583         for_each_member_device(ca, c, i)
584                 cancel_work_sync(&ca->io_error_work);
585
586         cancel_work_sync(&c->read_only_work);
587 }
588
589 void bch2_fs_free(struct bch_fs *c)
590 {
591         unsigned i;
592
593         mutex_lock(&bch_fs_list_lock);
594         list_del(&c->list);
595         mutex_unlock(&bch_fs_list_lock);
596
597         closure_sync(&c->cl);
598         closure_debug_destroy(&c->cl);
599
600         for (i = 0; i < c->sb.nr_devices; i++) {
601                 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true);
602
603                 if (ca) {
604                         bch2_free_super(&ca->disk_sb);
605                         bch2_dev_free(ca);
606                 }
607         }
608
609         bch_verbose(c, "shutdown complete");
610
611         kobject_put(&c->kobj);
612 }
613
614 void bch2_fs_stop(struct bch_fs *c)
615 {
616         __bch2_fs_stop(c);
617         bch2_fs_free(c);
618 }
619
620 static int bch2_fs_online(struct bch_fs *c)
621 {
622         struct bch_dev *ca;
623         unsigned i;
624         int ret = 0;
625
626         lockdep_assert_held(&bch_fs_list_lock);
627
628         if (__bch2_uuid_to_fs(c->sb.uuid)) {
629                 bch_err(c, "filesystem UUID already open");
630                 return -EINVAL;
631         }
632
633         ret = bch2_fs_chardev_init(c);
634         if (ret) {
635                 bch_err(c, "error creating character device");
636                 return ret;
637         }
638
639         bch2_fs_debug_init(c);
640
641         ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
642             kobject_add(&c->internal, &c->kobj, "internal") ?:
643             kobject_add(&c->opts_dir, &c->kobj, "options") ?:
644             kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
645             kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
646             bch2_opts_create_sysfs_files(&c->opts_dir);
647         if (ret) {
648                 bch_err(c, "error creating sysfs objects");
649                 return ret;
650         }
651
652         down_write(&c->state_lock);
653
654         for_each_member_device(ca, c, i) {
655                 ret = bch2_dev_sysfs_online(c, ca);
656                 if (ret) {
657                         bch_err(c, "error creating sysfs objects");
658                         percpu_ref_put(&ca->ref);
659                         goto err;
660                 }
661         }
662
663         BUG_ON(!list_empty(&c->list));
664         list_add(&c->list, &bch_fs_list);
665 err:
666         up_write(&c->state_lock);
667         return ret;
668 }
669
670 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
671 {
672         struct bch_fs *c;
673         struct printbuf name = PRINTBUF;
674         unsigned i, iter_size;
675         int ret = 0;
676
677         c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
678         if (!c) {
679                 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc);
680                 goto out;
681         }
682
683         __module_get(THIS_MODULE);
684
685         closure_init(&c->cl, NULL);
686
687         c->kobj.kset = bcachefs_kset;
688         kobject_init(&c->kobj, &bch2_fs_ktype);
689         kobject_init(&c->internal, &bch2_fs_internal_ktype);
690         kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
691         kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
692         kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
693
694         c->minor                = -1;
695         c->disk_sb.fs_sb        = true;
696
697         init_rwsem(&c->state_lock);
698         mutex_init(&c->sb_lock);
699         mutex_init(&c->replicas_gc_lock);
700         mutex_init(&c->btree_root_lock);
701         INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
702
703         init_rwsem(&c->gc_lock);
704         mutex_init(&c->gc_gens_lock);
705
706         for (i = 0; i < BCH_TIME_STAT_NR; i++)
707                 bch2_time_stats_init(&c->times[i]);
708
709         bch2_fs_copygc_init(c);
710         bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
711         bch2_fs_btree_interior_update_init_early(c);
712         bch2_fs_allocator_background_init(c);
713         bch2_fs_allocator_foreground_init(c);
714         bch2_fs_rebalance_init(c);
715         bch2_fs_quota_init(c);
716         bch2_fs_ec_init_early(c);
717         bch2_fs_move_init(c);
718         bch2_fs_sb_errors_init_early(c);
719
720         INIT_LIST_HEAD(&c->list);
721
722         mutex_init(&c->usage_scratch_lock);
723
724         mutex_init(&c->bio_bounce_pages_lock);
725         mutex_init(&c->snapshot_table_lock);
726         init_rwsem(&c->snapshot_create_lock);
727
728         spin_lock_init(&c->btree_write_error_lock);
729
730         INIT_WORK(&c->journal_seq_blacklist_gc_work,
731                   bch2_blacklist_entries_gc);
732
733         INIT_LIST_HEAD(&c->journal_iters);
734
735         INIT_LIST_HEAD(&c->fsck_error_msgs);
736         mutex_init(&c->fsck_error_msgs_lock);
737
738         seqcount_init(&c->gc_pos_lock);
739
740         seqcount_init(&c->usage_lock);
741
742         sema_init(&c->io_in_flight, 128);
743
744         INIT_LIST_HEAD(&c->vfs_inodes_list);
745         mutex_init(&c->vfs_inodes_lock);
746
747         c->copy_gc_enabled              = 1;
748         c->rebalance.enabled            = 1;
749         c->promote_whole_extents        = true;
750
751         c->journal.flush_write_time     = &c->times[BCH_TIME_journal_flush_write];
752         c->journal.noflush_write_time   = &c->times[BCH_TIME_journal_noflush_write];
753         c->journal.blocked_time         = &c->times[BCH_TIME_blocked_journal];
754         c->journal.flush_seq_time       = &c->times[BCH_TIME_journal_flush_seq];
755
756         bch2_fs_btree_cache_init_early(&c->btree_cache);
757
758         mutex_init(&c->sectors_available_lock);
759
760         ret = percpu_init_rwsem(&c->mark_lock);
761         if (ret)
762                 goto err;
763
764         mutex_lock(&c->sb_lock);
765         ret = bch2_sb_to_fs(c, sb);
766         mutex_unlock(&c->sb_lock);
767
768         if (ret)
769                 goto err;
770
771         pr_uuid(&name, c->sb.user_uuid.b);
772         strscpy(c->name, name.buf, sizeof(c->name));
773         printbuf_exit(&name);
774
775         ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0;
776         if (ret)
777                 goto err;
778
779         /* Compat: */
780         if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
781             !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
782                 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
783
784         if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
785             !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
786                 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
787
788         c->opts = bch2_opts_default;
789         ret = bch2_opts_from_sb(&c->opts, sb);
790         if (ret)
791                 goto err;
792
793         bch2_opts_apply(&c->opts, opts);
794
795         c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
796         if (c->opts.inodes_use_key_cache)
797                 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
798         c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops;
799
800         c->block_bits           = ilog2(block_sectors(c));
801         c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
802
803         if (bch2_fs_init_fault("fs_alloc")) {
804                 bch_err(c, "fs_alloc fault injected");
805                 ret = -EFAULT;
806                 goto err;
807         }
808
809         iter_size = sizeof(struct sort_iter) +
810                 (btree_blocks(c) + 1) * 2 *
811                 sizeof(struct sort_iter_set);
812
813         c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
814
815         if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
816                                 WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) ||
817             !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
818                                 WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
819             !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
820                                 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
821             !(c->io_complete_wq = alloc_workqueue("bcachefs_io",
822                                 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) ||
823             !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref",
824                                 WQ_FREEZABLE, 0)) ||
825 #ifndef BCH_WRITE_REF_DEBUG
826             percpu_ref_init(&c->writes, bch2_writes_disabled,
827                             PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
828 #endif
829             mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
830             bioset_init(&c->btree_bio, 1,
831                         max(offsetof(struct btree_read_bio, bio),
832                             offsetof(struct btree_write_bio, wbio.bio)),
833                         BIOSET_NEED_BVECS) ||
834             !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
835             !(c->online_reserved = alloc_percpu(u64)) ||
836             mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
837                                         btree_bytes(c)) ||
838             mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
839             !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
840                                               sizeof(u64), GFP_KERNEL))) {
841                 ret = -BCH_ERR_ENOMEM_fs_other_alloc;
842                 goto err;
843         }
844
845         ret = bch2_fs_counters_init(c) ?:
846             bch2_fs_sb_errors_init(c) ?:
847             bch2_io_clock_init(&c->io_clock[READ]) ?:
848             bch2_io_clock_init(&c->io_clock[WRITE]) ?:
849             bch2_fs_journal_init(&c->journal) ?:
850             bch2_fs_replicas_init(c) ?:
851             bch2_fs_btree_cache_init(c) ?:
852             bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
853             bch2_fs_btree_iter_init(c) ?:
854             bch2_fs_btree_interior_update_init(c) ?:
855             bch2_fs_buckets_waiting_for_journal_init(c) ?:
856             bch2_fs_btree_write_buffer_init(c) ?:
857             bch2_fs_subvolumes_init(c) ?:
858             bch2_fs_io_read_init(c) ?:
859             bch2_fs_io_write_init(c) ?:
860             bch2_fs_nocow_locking_init(c) ?:
861             bch2_fs_encryption_init(c) ?:
862             bch2_fs_compress_init(c) ?:
863             bch2_fs_ec_init(c) ?:
864             bch2_fs_fsio_init(c) ?:
865             bch2_fs_fs_io_buffered_init(c) ?:
866             bch2_fs_fs_io_direct_init(c);
867         if (ret)
868                 goto err;
869
870         for (i = 0; i < c->sb.nr_devices; i++)
871                 if (bch2_dev_exists(c->disk_sb.sb, i) &&
872                     bch2_dev_alloc(c, i)) {
873                         ret = -EEXIST;
874                         goto err;
875                 }
876
877         bch2_journal_entry_res_resize(&c->journal,
878                         &c->btree_root_journal_res,
879                         BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
880         bch2_dev_usage_journal_reserve(c);
881         bch2_journal_entry_res_resize(&c->journal,
882                         &c->clock_journal_res,
883                         (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
884
885         mutex_lock(&bch_fs_list_lock);
886         ret = bch2_fs_online(c);
887         mutex_unlock(&bch_fs_list_lock);
888
889         if (ret)
890                 goto err;
891 out:
892         return c;
893 err:
894         bch2_fs_free(c);
895         c = ERR_PTR(ret);
896         goto out;
897 }
898
899 noinline_for_stack
900 static void print_mount_opts(struct bch_fs *c)
901 {
902         enum bch_opt_id i;
903         struct printbuf p = PRINTBUF;
904         bool first = true;
905
906         prt_str(&p, "mounting version ");
907         bch2_version_to_text(&p, c->sb.version);
908
909         if (c->opts.read_only) {
910                 prt_str(&p, " opts=");
911                 first = false;
912                 prt_printf(&p, "ro");
913         }
914
915         for (i = 0; i < bch2_opts_nr; i++) {
916                 const struct bch_option *opt = &bch2_opt_table[i];
917                 u64 v = bch2_opt_get_by_id(&c->opts, i);
918
919                 if (!(opt->flags & OPT_MOUNT))
920                         continue;
921
922                 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
923                         continue;
924
925                 prt_str(&p, first ? " opts=" : ",");
926                 first = false;
927                 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);
928         }
929
930         bch_info(c, "%s", p.buf);
931         printbuf_exit(&p);
932 }
933
934 int bch2_fs_start(struct bch_fs *c)
935 {
936         struct bch_dev *ca;
937         time64_t now = ktime_get_real_seconds();
938         unsigned i;
939         int ret;
940
941         print_mount_opts(c);
942
943         down_write(&c->state_lock);
944
945         BUG_ON(test_bit(BCH_FS_STARTED, &c->flags));
946
947         mutex_lock(&c->sb_lock);
948
949         ret = bch2_sb_members_v2_init(c);
950         if (ret) {
951                 mutex_unlock(&c->sb_lock);
952                 goto err;
953         }
954
955         for_each_online_member(ca, c, i)
956                 bch2_members_v2_get_mut(c->disk_sb.sb, i)->last_mount = cpu_to_le64(now);
957
958         mutex_unlock(&c->sb_lock);
959
960         for_each_rw_member(ca, c, i)
961                 bch2_dev_allocator_add(c, ca);
962         bch2_recalc_capacity(c);
963
964         ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
965                 ? bch2_fs_recovery(c)
966                 : bch2_fs_initialize(c);
967         if (ret)
968                 goto err;
969
970         ret = bch2_opts_check_may_set(c);
971         if (ret)
972                 goto err;
973
974         if (bch2_fs_init_fault("fs_start")) {
975                 bch_err(c, "fs_start fault injected");
976                 ret = -EINVAL;
977                 goto err;
978         }
979
980         set_bit(BCH_FS_STARTED, &c->flags);
981
982         if (c->opts.read_only || c->opts.nochanges) {
983                 bch2_fs_read_only(c);
984         } else {
985                 ret = !test_bit(BCH_FS_RW, &c->flags)
986                         ? bch2_fs_read_write(c)
987                         : bch2_fs_read_write_late(c);
988                 if (ret)
989                         goto err;
990         }
991
992         ret = 0;
993 out:
994         up_write(&c->state_lock);
995         return ret;
996 err:
997         bch_err_msg(c, ret, "starting filesystem");
998         goto out;
999 }
1000
1001 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
1002 {
1003         struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx);
1004
1005         if (le16_to_cpu(sb->block_size) != block_sectors(c))
1006                 return -BCH_ERR_mismatched_block_size;
1007
1008         if (le16_to_cpu(m.bucket_size) <
1009             BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
1010                 return -BCH_ERR_bucket_size_too_small;
1011
1012         return 0;
1013 }
1014
1015 static int bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
1016 {
1017         struct bch_sb *newest =
1018                 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
1019
1020         if (!uuid_equal(&fs->uuid, &sb->uuid))
1021                 return -BCH_ERR_device_not_a_member_of_filesystem;
1022
1023         if (!bch2_dev_exists(newest, sb->dev_idx))
1024                 return -BCH_ERR_device_has_been_removed;
1025
1026         if (fs->block_size != sb->block_size)
1027                 return -BCH_ERR_mismatched_block_size;
1028
1029         return 0;
1030 }
1031
1032 /* Device startup/shutdown: */
1033
1034 static void bch2_dev_release(struct kobject *kobj)
1035 {
1036         struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
1037
1038         kfree(ca);
1039 }
1040
1041 static void bch2_dev_free(struct bch_dev *ca)
1042 {
1043         cancel_work_sync(&ca->io_error_work);
1044
1045         if (ca->kobj.state_in_sysfs &&
1046             ca->disk_sb.bdev)
1047                 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1048
1049         if (ca->kobj.state_in_sysfs)
1050                 kobject_del(&ca->kobj);
1051
1052         bch2_free_super(&ca->disk_sb);
1053         bch2_dev_journal_exit(ca);
1054
1055         free_percpu(ca->io_done);
1056         bioset_exit(&ca->replica_set);
1057         bch2_dev_buckets_free(ca);
1058         free_page((unsigned long) ca->sb_read_scratch);
1059
1060         bch2_time_stats_exit(&ca->io_latency[WRITE]);
1061         bch2_time_stats_exit(&ca->io_latency[READ]);
1062
1063         percpu_ref_exit(&ca->io_ref);
1064         percpu_ref_exit(&ca->ref);
1065         kobject_put(&ca->kobj);
1066 }
1067
1068 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1069 {
1070
1071         lockdep_assert_held(&c->state_lock);
1072
1073         if (percpu_ref_is_zero(&ca->io_ref))
1074                 return;
1075
1076         __bch2_dev_read_only(c, ca);
1077
1078         reinit_completion(&ca->io_ref_completion);
1079         percpu_ref_kill(&ca->io_ref);
1080         wait_for_completion(&ca->io_ref_completion);
1081
1082         if (ca->kobj.state_in_sysfs) {
1083                 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1084                 sysfs_remove_link(&ca->kobj, "block");
1085         }
1086
1087         bch2_free_super(&ca->disk_sb);
1088         bch2_dev_journal_exit(ca);
1089 }
1090
1091 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1092 {
1093         struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1094
1095         complete(&ca->ref_completion);
1096 }
1097
1098 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1099 {
1100         struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1101
1102         complete(&ca->io_ref_completion);
1103 }
1104
1105 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1106 {
1107         int ret;
1108
1109         if (!c->kobj.state_in_sysfs)
1110                 return 0;
1111
1112         if (!ca->kobj.state_in_sysfs) {
1113                 ret = kobject_add(&ca->kobj, &c->kobj,
1114                                   "dev-%u", ca->dev_idx);
1115                 if (ret)
1116                         return ret;
1117         }
1118
1119         if (ca->disk_sb.bdev) {
1120                 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1121
1122                 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1123                 if (ret)
1124                         return ret;
1125
1126                 ret = sysfs_create_link(&ca->kobj, block, "block");
1127                 if (ret)
1128                         return ret;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1135                                         struct bch_member *member)
1136 {
1137         struct bch_dev *ca;
1138         unsigned i;
1139
1140         ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1141         if (!ca)
1142                 return NULL;
1143
1144         kobject_init(&ca->kobj, &bch2_dev_ktype);
1145         init_completion(&ca->ref_completion);
1146         init_completion(&ca->io_ref_completion);
1147
1148         init_rwsem(&ca->bucket_lock);
1149
1150         INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1151
1152         bch2_time_stats_init(&ca->io_latency[READ]);
1153         bch2_time_stats_init(&ca->io_latency[WRITE]);
1154
1155         ca->mi = bch2_mi_to_cpu(member);
1156
1157         for (i = 0; i < ARRAY_SIZE(member->errors); i++)
1158                 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i]));
1159
1160         ca->uuid = member->uuid;
1161
1162         ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
1163                              ca->mi.bucket_size / btree_sectors(c));
1164
1165         if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
1166                             0, GFP_KERNEL) ||
1167             percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1168                             PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1169             !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
1170             bch2_dev_buckets_alloc(c, ca) ||
1171             bioset_init(&ca->replica_set, 4,
1172                         offsetof(struct bch_write_bio, bio), 0) ||
1173             !(ca->io_done       = alloc_percpu(*ca->io_done)))
1174                 goto err;
1175
1176         return ca;
1177 err:
1178         bch2_dev_free(ca);
1179         return NULL;
1180 }
1181
1182 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1183                             unsigned dev_idx)
1184 {
1185         ca->dev_idx = dev_idx;
1186         __set_bit(ca->dev_idx, ca->self.d);
1187         scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1188
1189         ca->fs = c;
1190         rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1191
1192         if (bch2_dev_sysfs_online(c, ca))
1193                 pr_warn("error creating sysfs objects");
1194 }
1195
1196 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1197 {
1198         struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx);
1199         struct bch_dev *ca = NULL;
1200         int ret = 0;
1201
1202         if (bch2_fs_init_fault("dev_alloc"))
1203                 goto err;
1204
1205         ca = __bch2_dev_alloc(c, &member);
1206         if (!ca)
1207                 goto err;
1208
1209         ca->fs = c;
1210
1211         bch2_dev_attach(c, ca, dev_idx);
1212         return ret;
1213 err:
1214         if (ca)
1215                 bch2_dev_free(ca);
1216         return -BCH_ERR_ENOMEM_dev_alloc;
1217 }
1218
1219 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1220 {
1221         unsigned ret;
1222
1223         if (bch2_dev_is_online(ca)) {
1224                 bch_err(ca, "already have device online in slot %u",
1225                         sb->sb->dev_idx);
1226                 return -BCH_ERR_device_already_online;
1227         }
1228
1229         if (get_capacity(sb->bdev->bd_disk) <
1230             ca->mi.bucket_size * ca->mi.nbuckets) {
1231                 bch_err(ca, "cannot online: device too small");
1232                 return -BCH_ERR_device_size_too_small;
1233         }
1234
1235         BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1236
1237         ret = bch2_dev_journal_init(ca, sb->sb);
1238         if (ret)
1239                 return ret;
1240
1241         /* Commit: */
1242         ca->disk_sb = *sb;
1243         memset(sb, 0, sizeof(*sb));
1244
1245         ca->dev = ca->disk_sb.bdev->bd_dev;
1246
1247         percpu_ref_reinit(&ca->io_ref);
1248
1249         return 0;
1250 }
1251
1252 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1253 {
1254         struct bch_dev *ca;
1255         int ret;
1256
1257         lockdep_assert_held(&c->state_lock);
1258
1259         if (le64_to_cpu(sb->sb->seq) >
1260             le64_to_cpu(c->disk_sb.sb->seq))
1261                 bch2_sb_to_fs(c, sb->sb);
1262
1263         BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1264                !c->devs[sb->sb->dev_idx]);
1265
1266         ca = bch_dev_locked(c, sb->sb->dev_idx);
1267
1268         ret = __bch2_dev_attach_bdev(ca, sb);
1269         if (ret)
1270                 return ret;
1271
1272         bch2_dev_sysfs_online(c, ca);
1273
1274         if (c->sb.nr_devices == 1)
1275                 snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev);
1276         snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev);
1277
1278         rebalance_wakeup(c);
1279         return 0;
1280 }
1281
1282 /* Device management: */
1283
1284 /*
1285  * Note: this function is also used by the error paths - when a particular
1286  * device sees an error, we call it to determine whether we can just set the
1287  * device RO, or - if this function returns false - we'll set the whole
1288  * filesystem RO:
1289  *
1290  * XXX: maybe we should be more explicit about whether we're changing state
1291  * because we got an error or what have you?
1292  */
1293 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1294                             enum bch_member_state new_state, int flags)
1295 {
1296         struct bch_devs_mask new_online_devs;
1297         struct bch_dev *ca2;
1298         int i, nr_rw = 0, required;
1299
1300         lockdep_assert_held(&c->state_lock);
1301
1302         switch (new_state) {
1303         case BCH_MEMBER_STATE_rw:
1304                 return true;
1305         case BCH_MEMBER_STATE_ro:
1306                 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1307                         return true;
1308
1309                 /* do we have enough devices to write to?  */
1310                 for_each_member_device(ca2, c, i)
1311                         if (ca2 != ca)
1312                                 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1313
1314                 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1315                                ? c->opts.metadata_replicas
1316                                : c->opts.metadata_replicas_required,
1317                                !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1318                                ? c->opts.data_replicas
1319                                : c->opts.data_replicas_required);
1320
1321                 return nr_rw >= required;
1322         case BCH_MEMBER_STATE_failed:
1323         case BCH_MEMBER_STATE_spare:
1324                 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1325                     ca->mi.state != BCH_MEMBER_STATE_ro)
1326                         return true;
1327
1328                 /* do we have enough devices to read from?  */
1329                 new_online_devs = bch2_online_devs(c);
1330                 __clear_bit(ca->dev_idx, new_online_devs.d);
1331
1332                 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1333         default:
1334                 BUG();
1335         }
1336 }
1337
1338 static bool bch2_fs_may_start(struct bch_fs *c)
1339 {
1340         struct bch_dev *ca;
1341         unsigned i, flags = 0;
1342
1343         if (c->opts.very_degraded)
1344                 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1345
1346         if (c->opts.degraded)
1347                 flags |= BCH_FORCE_IF_DEGRADED;
1348
1349         if (!c->opts.degraded &&
1350             !c->opts.very_degraded) {
1351                 mutex_lock(&c->sb_lock);
1352
1353                 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1354                         if (!bch2_dev_exists(c->disk_sb.sb, i))
1355                                 continue;
1356
1357                         ca = bch_dev_locked(c, i);
1358
1359                         if (!bch2_dev_is_online(ca) &&
1360                             (ca->mi.state == BCH_MEMBER_STATE_rw ||
1361                              ca->mi.state == BCH_MEMBER_STATE_ro)) {
1362                                 mutex_unlock(&c->sb_lock);
1363                                 return false;
1364                         }
1365                 }
1366                 mutex_unlock(&c->sb_lock);
1367         }
1368
1369         return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1370 }
1371
1372 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1373 {
1374         /*
1375          * The allocator thread itself allocates btree nodes, so stop it first:
1376          */
1377         bch2_dev_allocator_remove(c, ca);
1378         bch2_dev_journal_stop(&c->journal, ca);
1379 }
1380
1381 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1382 {
1383         lockdep_assert_held(&c->state_lock);
1384
1385         BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1386
1387         bch2_dev_allocator_add(c, ca);
1388         bch2_recalc_capacity(c);
1389 }
1390
1391 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1392                          enum bch_member_state new_state, int flags)
1393 {
1394         struct bch_member *m;
1395         int ret = 0;
1396
1397         if (ca->mi.state == new_state)
1398                 return 0;
1399
1400         if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1401                 return -BCH_ERR_device_state_not_allowed;
1402
1403         if (new_state != BCH_MEMBER_STATE_rw)
1404                 __bch2_dev_read_only(c, ca);
1405
1406         bch_notice(ca, "%s", bch2_member_states[new_state]);
1407
1408         mutex_lock(&c->sb_lock);
1409         m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1410         SET_BCH_MEMBER_STATE(m, new_state);
1411         bch2_write_super(c);
1412         mutex_unlock(&c->sb_lock);
1413
1414         if (new_state == BCH_MEMBER_STATE_rw)
1415                 __bch2_dev_read_write(c, ca);
1416
1417         rebalance_wakeup(c);
1418
1419         return ret;
1420 }
1421
1422 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1423                        enum bch_member_state new_state, int flags)
1424 {
1425         int ret;
1426
1427         down_write(&c->state_lock);
1428         ret = __bch2_dev_set_state(c, ca, new_state, flags);
1429         up_write(&c->state_lock);
1430
1431         return ret;
1432 }
1433
1434 /* Device add/removal: */
1435
1436 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
1437 {
1438         struct bpos start       = POS(ca->dev_idx, 0);
1439         struct bpos end         = POS(ca->dev_idx, U64_MAX);
1440         int ret;
1441
1442         /*
1443          * We clear the LRU and need_discard btrees first so that we don't race
1444          * with bch2_do_invalidates() and bch2_do_discards()
1445          */
1446         ret =   bch2_btree_delete_range(c, BTREE_ID_lru, start, end,
1447                                         BTREE_TRIGGER_NORUN, NULL) ?:
1448                 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end,
1449                                         BTREE_TRIGGER_NORUN, NULL) ?:
1450                 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end,
1451                                         BTREE_TRIGGER_NORUN, NULL) ?:
1452                 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end,
1453                                         BTREE_TRIGGER_NORUN, NULL) ?:
1454                 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end,
1455                                         BTREE_TRIGGER_NORUN, NULL) ?:
1456                 bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end,
1457                                         BTREE_TRIGGER_NORUN, NULL);
1458         if (ret)
1459                 bch_err_msg(c, ret, "removing dev alloc info");
1460
1461         return ret;
1462 }
1463
1464 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1465 {
1466         struct bch_member *m;
1467         unsigned dev_idx = ca->dev_idx, data;
1468         int ret;
1469
1470         down_write(&c->state_lock);
1471
1472         /*
1473          * We consume a reference to ca->ref, regardless of whether we succeed
1474          * or fail:
1475          */
1476         percpu_ref_put(&ca->ref);
1477
1478         if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1479                 bch_err(ca, "Cannot remove without losing data");
1480                 ret = -BCH_ERR_device_state_not_allowed;
1481                 goto err;
1482         }
1483
1484         __bch2_dev_read_only(c, ca);
1485
1486         ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1487         if (ret) {
1488                 bch_err_msg(ca, ret, "dropping data");
1489                 goto err;
1490         }
1491
1492         ret = bch2_dev_remove_alloc(c, ca);
1493         if (ret) {
1494                 bch_err_msg(ca, ret, "deleting alloc info");
1495                 goto err;
1496         }
1497
1498         ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1499         if (ret) {
1500                 bch_err_msg(ca, ret, "flushing journal");
1501                 goto err;
1502         }
1503
1504         ret = bch2_journal_flush(&c->journal);
1505         if (ret) {
1506                 bch_err(ca, "journal error");
1507                 goto err;
1508         }
1509
1510         ret = bch2_replicas_gc2(c);
1511         if (ret) {
1512                 bch_err_msg(ca, ret, "in replicas_gc2()");
1513                 goto err;
1514         }
1515
1516         data = bch2_dev_has_data(c, ca);
1517         if (data) {
1518                 struct printbuf data_has = PRINTBUF;
1519
1520                 prt_bitflags(&data_has, bch2_data_types, data);
1521                 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
1522                 printbuf_exit(&data_has);
1523                 ret = -EBUSY;
1524                 goto err;
1525         }
1526
1527         __bch2_dev_offline(c, ca);
1528
1529         mutex_lock(&c->sb_lock);
1530         rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1531         mutex_unlock(&c->sb_lock);
1532
1533         percpu_ref_kill(&ca->ref);
1534         wait_for_completion(&ca->ref_completion);
1535
1536         bch2_dev_free(ca);
1537
1538         /*
1539          * At this point the device object has been removed in-core, but the
1540          * on-disk journal might still refer to the device index via sb device
1541          * usage entries. Recovery fails if it sees usage information for an
1542          * invalid device. Flush journal pins to push the back of the journal
1543          * past now invalid device index references before we update the
1544          * superblock, but after the device object has been removed so any
1545          * further journal writes elide usage info for the device.
1546          */
1547         bch2_journal_flush_all_pins(&c->journal);
1548
1549         /*
1550          * Free this device's slot in the bch_member array - all pointers to
1551          * this device must be gone:
1552          */
1553         mutex_lock(&c->sb_lock);
1554         m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1555         memset(&m->uuid, 0, sizeof(m->uuid));
1556
1557         bch2_write_super(c);
1558
1559         mutex_unlock(&c->sb_lock);
1560         up_write(&c->state_lock);
1561
1562         bch2_dev_usage_journal_reserve(c);
1563         return 0;
1564 err:
1565         if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1566             !percpu_ref_is_zero(&ca->io_ref))
1567                 __bch2_dev_read_write(c, ca);
1568         up_write(&c->state_lock);
1569         return ret;
1570 }
1571
1572 /* Add new device to running filesystem: */
1573 int bch2_dev_add(struct bch_fs *c, const char *path)
1574 {
1575         struct bch_opts opts = bch2_opts_empty();
1576         struct bch_sb_handle sb;
1577         struct bch_dev *ca = NULL;
1578         struct bch_sb_field_members_v2 *mi;
1579         struct bch_member dev_mi;
1580         unsigned dev_idx, nr_devices, u64s;
1581         struct printbuf errbuf = PRINTBUF;
1582         struct printbuf label = PRINTBUF;
1583         int ret;
1584
1585         ret = bch2_read_super(path, &opts, &sb);
1586         if (ret) {
1587                 bch_err_msg(c, ret, "reading super");
1588                 goto err;
1589         }
1590
1591         dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx);
1592
1593         if (BCH_MEMBER_GROUP(&dev_mi)) {
1594                 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
1595                 if (label.allocation_failure) {
1596                         ret = -ENOMEM;
1597                         goto err;
1598                 }
1599         }
1600
1601         ret = bch2_dev_may_add(sb.sb, c);
1602         if (ret) {
1603                 bch_err_fn(c, ret);
1604                 goto err;
1605         }
1606
1607         ca = __bch2_dev_alloc(c, &dev_mi);
1608         if (!ca) {
1609                 ret = -ENOMEM;
1610                 goto err;
1611         }
1612
1613         bch2_dev_usage_init(ca);
1614
1615         ret = __bch2_dev_attach_bdev(ca, &sb);
1616         if (ret)
1617                 goto err;
1618
1619         ret = bch2_dev_journal_alloc(ca);
1620         if (ret) {
1621                 bch_err_msg(c, ret, "allocating journal");
1622                 goto err;
1623         }
1624
1625         down_write(&c->state_lock);
1626         mutex_lock(&c->sb_lock);
1627
1628         ret = bch2_sb_from_fs(c, ca);
1629         if (ret) {
1630                 bch_err_msg(c, ret, "setting up new superblock");
1631                 goto err_unlock;
1632         }
1633
1634         if (dynamic_fault("bcachefs:add:no_slot"))
1635                 goto no_slot;
1636
1637         for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1638                 if (!bch2_dev_exists(c->disk_sb.sb, dev_idx))
1639                         goto have_slot;
1640 no_slot:
1641         ret = -BCH_ERR_ENOSPC_sb_members;
1642         bch_err_msg(c, ret, "setting up new superblock");
1643         goto err_unlock;
1644
1645 have_slot:
1646         nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1647
1648         mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
1649         u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) +
1650                             le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64));
1651
1652         mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s);
1653         if (!mi) {
1654                 ret = -BCH_ERR_ENOSPC_sb_members;
1655                 bch_err_msg(c, ret, "setting up new superblock");
1656                 goto err_unlock;
1657         }
1658         struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1659
1660         /* success: */
1661
1662         *m = dev_mi;
1663         m->last_mount = cpu_to_le64(ktime_get_real_seconds());
1664         c->disk_sb.sb->nr_devices       = nr_devices;
1665
1666         ca->disk_sb.sb->dev_idx = dev_idx;
1667         bch2_dev_attach(c, ca, dev_idx);
1668
1669         if (BCH_MEMBER_GROUP(&dev_mi)) {
1670                 ret = __bch2_dev_group_set(c, ca, label.buf);
1671                 if (ret) {
1672                         bch_err_msg(c, ret, "creating new label");
1673                         goto err_unlock;
1674                 }
1675         }
1676
1677         bch2_write_super(c);
1678         mutex_unlock(&c->sb_lock);
1679
1680         bch2_dev_usage_journal_reserve(c);
1681
1682         ret = bch2_trans_mark_dev_sb(c, ca);
1683         if (ret) {
1684                 bch_err_msg(ca, ret, "marking new superblock");
1685                 goto err_late;
1686         }
1687
1688         ret = bch2_fs_freespace_init(c);
1689         if (ret) {
1690                 bch_err_msg(ca, ret, "initializing free space");
1691                 goto err_late;
1692         }
1693
1694         ca->new_fs_bucket_idx = 0;
1695
1696         if (ca->mi.state == BCH_MEMBER_STATE_rw)
1697                 __bch2_dev_read_write(c, ca);
1698
1699         up_write(&c->state_lock);
1700         return 0;
1701
1702 err_unlock:
1703         mutex_unlock(&c->sb_lock);
1704         up_write(&c->state_lock);
1705 err:
1706         if (ca)
1707                 bch2_dev_free(ca);
1708         bch2_free_super(&sb);
1709         printbuf_exit(&label);
1710         printbuf_exit(&errbuf);
1711         return ret;
1712 err_late:
1713         up_write(&c->state_lock);
1714         ca = NULL;
1715         goto err;
1716 }
1717
1718 /* Hot add existing device to running filesystem: */
1719 int bch2_dev_online(struct bch_fs *c, const char *path)
1720 {
1721         struct bch_opts opts = bch2_opts_empty();
1722         struct bch_sb_handle sb = { NULL };
1723         struct bch_dev *ca;
1724         unsigned dev_idx;
1725         int ret;
1726
1727         down_write(&c->state_lock);
1728
1729         ret = bch2_read_super(path, &opts, &sb);
1730         if (ret) {
1731                 up_write(&c->state_lock);
1732                 return ret;
1733         }
1734
1735         dev_idx = sb.sb->dev_idx;
1736
1737         ret = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
1738         if (ret) {
1739                 bch_err_msg(c, ret, "bringing %s online", path);
1740                 goto err;
1741         }
1742
1743         ret = bch2_dev_attach_bdev(c, &sb);
1744         if (ret)
1745                 goto err;
1746
1747         ca = bch_dev_locked(c, dev_idx);
1748
1749         ret = bch2_trans_mark_dev_sb(c, ca);
1750         if (ret) {
1751                 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path);
1752                 goto err;
1753         }
1754
1755         if (ca->mi.state == BCH_MEMBER_STATE_rw)
1756                 __bch2_dev_read_write(c, ca);
1757
1758         if (!ca->mi.freespace_initialized) {
1759                 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);
1760                 bch_err_msg(ca, ret, "initializing free space");
1761                 if (ret)
1762                         goto err;
1763         }
1764
1765         if (!ca->journal.nr) {
1766                 ret = bch2_dev_journal_alloc(ca);
1767                 bch_err_msg(ca, ret, "allocating journal");
1768                 if (ret)
1769                         goto err;
1770         }
1771
1772         mutex_lock(&c->sb_lock);
1773         bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount =
1774                 cpu_to_le64(ktime_get_real_seconds());
1775         bch2_write_super(c);
1776         mutex_unlock(&c->sb_lock);
1777
1778         up_write(&c->state_lock);
1779         return 0;
1780 err:
1781         up_write(&c->state_lock);
1782         bch2_free_super(&sb);
1783         return ret;
1784 }
1785
1786 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1787 {
1788         down_write(&c->state_lock);
1789
1790         if (!bch2_dev_is_online(ca)) {
1791                 bch_err(ca, "Already offline");
1792                 up_write(&c->state_lock);
1793                 return 0;
1794         }
1795
1796         if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1797                 bch_err(ca, "Cannot offline required disk");
1798                 up_write(&c->state_lock);
1799                 return -BCH_ERR_device_state_not_allowed;
1800         }
1801
1802         __bch2_dev_offline(c, ca);
1803
1804         up_write(&c->state_lock);
1805         return 0;
1806 }
1807
1808 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1809 {
1810         struct bch_member *m;
1811         u64 old_nbuckets;
1812         int ret = 0;
1813
1814         down_write(&c->state_lock);
1815         old_nbuckets = ca->mi.nbuckets;
1816
1817         if (nbuckets < ca->mi.nbuckets) {
1818                 bch_err(ca, "Cannot shrink yet");
1819                 ret = -EINVAL;
1820                 goto err;
1821         }
1822
1823         if (bch2_dev_is_online(ca) &&
1824             get_capacity(ca->disk_sb.bdev->bd_disk) <
1825             ca->mi.bucket_size * nbuckets) {
1826                 bch_err(ca, "New size larger than device");
1827                 ret = -BCH_ERR_device_size_too_small;
1828                 goto err;
1829         }
1830
1831         ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1832         if (ret) {
1833                 bch_err_msg(ca, ret, "resizing buckets");
1834                 goto err;
1835         }
1836
1837         ret = bch2_trans_mark_dev_sb(c, ca);
1838         if (ret)
1839                 goto err;
1840
1841         mutex_lock(&c->sb_lock);
1842         m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1843         m->nbuckets = cpu_to_le64(nbuckets);
1844
1845         bch2_write_super(c);
1846         mutex_unlock(&c->sb_lock);
1847
1848         if (ca->mi.freespace_initialized) {
1849                 ret = bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets);
1850                 if (ret)
1851                         goto err;
1852
1853                 /*
1854                  * XXX: this is all wrong transactionally - we'll be able to do
1855                  * this correctly after the disk space accounting rewrite
1856                  */
1857                 ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets;
1858         }
1859
1860         bch2_recalc_capacity(c);
1861 err:
1862         up_write(&c->state_lock);
1863         return ret;
1864 }
1865
1866 /* return with ref on ca->ref: */
1867 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
1868 {
1869         struct bch_dev *ca;
1870         unsigned i;
1871
1872         rcu_read_lock();
1873         for_each_member_device_rcu(ca, c, i, NULL)
1874                 if (!strcmp(name, ca->name))
1875                         goto found;
1876         ca = ERR_PTR(-BCH_ERR_ENOENT_dev_not_found);
1877 found:
1878         rcu_read_unlock();
1879
1880         return ca;
1881 }
1882
1883 /* Filesystem open: */
1884
1885 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
1886                             struct bch_opts opts)
1887 {
1888         struct bch_sb_handle *sb = NULL;
1889         struct bch_fs *c = NULL;
1890         unsigned i, best_sb = 0;
1891         struct printbuf errbuf = PRINTBUF;
1892         int ret = 0;
1893
1894         if (!try_module_get(THIS_MODULE))
1895                 return ERR_PTR(-ENODEV);
1896
1897         if (!nr_devices) {
1898                 ret = -EINVAL;
1899                 goto err;
1900         }
1901
1902         sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1903         if (!sb) {
1904                 ret = -ENOMEM;
1905                 goto err;
1906         }
1907
1908         for (i = 0; i < nr_devices; i++) {
1909                 ret = bch2_read_super(devices[i], &opts, &sb[i]);
1910                 if (ret)
1911                         goto err;
1912
1913         }
1914
1915         for (i = 1; i < nr_devices; i++)
1916                 if (le64_to_cpu(sb[i].sb->seq) >
1917                     le64_to_cpu(sb[best_sb].sb->seq))
1918                         best_sb = i;
1919
1920         i = 0;
1921         while (i < nr_devices) {
1922                 if (i != best_sb &&
1923                     !bch2_dev_exists(sb[best_sb].sb, sb[i].sb->dev_idx)) {
1924                         pr_info("%pg has been removed, skipping", sb[i].bdev);
1925                         bch2_free_super(&sb[i]);
1926                         array_remove_item(sb, nr_devices, i);
1927                         continue;
1928                 }
1929
1930                 ret = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1931                 if (ret)
1932                         goto err_print;
1933                 i++;
1934         }
1935
1936         c = bch2_fs_alloc(sb[best_sb].sb, opts);
1937         if (IS_ERR(c)) {
1938                 ret = PTR_ERR(c);
1939                 goto err;
1940         }
1941
1942         down_write(&c->state_lock);
1943         for (i = 0; i < nr_devices; i++) {
1944                 ret = bch2_dev_attach_bdev(c, &sb[i]);
1945                 if (ret) {
1946                         up_write(&c->state_lock);
1947                         goto err;
1948                 }
1949         }
1950         up_write(&c->state_lock);
1951
1952         if (!bch2_fs_may_start(c)) {
1953                 ret = -BCH_ERR_insufficient_devices_to_start;
1954                 goto err_print;
1955         }
1956
1957         if (!c->opts.nostart) {
1958                 ret = bch2_fs_start(c);
1959                 if (ret)
1960                         goto err;
1961         }
1962 out:
1963         kfree(sb);
1964         printbuf_exit(&errbuf);
1965         module_put(THIS_MODULE);
1966         return c;
1967 err_print:
1968         pr_err("bch_fs_open err opening %s: %s",
1969                devices[0], bch2_err_str(ret));
1970 err:
1971         if (!IS_ERR_OR_NULL(c))
1972                 bch2_fs_stop(c);
1973         if (sb)
1974                 for (i = 0; i < nr_devices; i++)
1975                         bch2_free_super(&sb[i]);
1976         c = ERR_PTR(ret);
1977         goto out;
1978 }
1979
1980 /* Global interfaces/init */
1981
1982 static void bcachefs_exit(void)
1983 {
1984         bch2_debug_exit();
1985         bch2_vfs_exit();
1986         bch2_chardev_exit();
1987         bch2_btree_key_cache_exit();
1988         if (bcachefs_kset)
1989                 kset_unregister(bcachefs_kset);
1990 }
1991
1992 static int __init bcachefs_init(void)
1993 {
1994         bch2_bkey_pack_test();
1995
1996         if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
1997             bch2_btree_key_cache_init() ||
1998             bch2_chardev_init() ||
1999             bch2_vfs_init() ||
2000             bch2_debug_init())
2001                 goto err;
2002
2003         return 0;
2004 err:
2005         bcachefs_exit();
2006         return -ENOMEM;
2007 }
2008
2009 #define BCH_DEBUG_PARAM(name, description)                      \
2010         bool bch2_##name;                                       \
2011         module_param_named(name, bch2_##name, bool, 0644);      \
2012         MODULE_PARM_DESC(name, description);
2013 BCH_DEBUG_PARAMS()
2014 #undef BCH_DEBUG_PARAM
2015
2016 __maybe_unused
2017 static unsigned bch2_metadata_version = bcachefs_metadata_version_current;
2018 module_param_named(version, bch2_metadata_version, uint, 0400);
2019
2020 module_exit(bcachefs_exit);
2021 module_init(bcachefs_init);