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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_node_scan.h"
19 #include "btree_update_interior.h"
20 #include "btree_io.h"
21 #include "btree_write_buffer.h"
22 #include "buckets_waiting_for_journal.h"
23 #include "chardev.h"
24 #include "checksum.h"
25 #include "clock.h"
26 #include "compress.h"
27 #include "debug.h"
28 #include "disk_accounting.h"
29 #include "disk_groups.h"
30 #include "ec.h"
31 #include "errcode.h"
32 #include "error.h"
33 #include "fs.h"
34 #include "fs-io.h"
35 #include "fs-io-buffered.h"
36 #include "fs-io-direct.h"
37 #include "fsck.h"
38 #include "inode.h"
39 #include "io_read.h"
40 #include "io_write.h"
41 #include "journal.h"
42 #include "journal_reclaim.h"
43 #include "journal_seq_blacklist.h"
44 #include "move.h"
45 #include "migrate.h"
46 #include "movinggc.h"
47 #include "nocow_locking.h"
48 #include "quota.h"
49 #include "rebalance.h"
50 #include "recovery.h"
51 #include "replicas.h"
52 #include "sb-clean.h"
53 #include "sb-counters.h"
54 #include "sb-errors.h"
55 #include "sb-members.h"
56 #include "snapshot.h"
57 #include "subvolume.h"
58 #include "super.h"
59 #include "super-io.h"
60 #include "sysfs.h"
61 #include "thread_with_file.h"
62 #include "trace.h"
63
64 #include <linux/backing-dev.h>
65 #include <linux/blkdev.h>
66 #include <linux/debugfs.h>
67 #include <linux/device.h>
68 #include <linux/idr.h>
69 #include <linux/module.h>
70 #include <linux/percpu.h>
71 #include <linux/random.h>
72 #include <linux/sysfs.h>
73 #include <crypto/hash.h>
74
75 MODULE_LICENSE("GPL");
76 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
77 MODULE_DESCRIPTION("bcachefs filesystem");
78 MODULE_SOFTDEP("pre: crc32c");
79 MODULE_SOFTDEP("pre: crc64");
80 MODULE_SOFTDEP("pre: sha256");
81 MODULE_SOFTDEP("pre: chacha20");
82 MODULE_SOFTDEP("pre: poly1305");
83 MODULE_SOFTDEP("pre: xxhash");
84
85 const char * const bch2_fs_flag_strs[] = {
86 #define x(n) #n,
87 BCH_FS_FLAGS()
88 #undef x
89 NULL
90 };
91
92 void bch2_print_str(struct bch_fs *c, const char *str)
93 {
94 #ifdef __KERNEL__
95 struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c);
96
97 if (unlikely(stdio)) {
98 bch2_stdio_redirect_printf(stdio, true, "%s", str);
99 return;
100 }
101 #endif
102 bch2_print_string_as_lines(KERN_ERR, str);
103 }
104
105 __printf(2, 0)
106 static void bch2_print_maybe_redirect(struct stdio_redirect *stdio, const char *fmt, va_list args)
107 {
108 #ifdef __KERNEL__
109 if (unlikely(stdio)) {
110 if (fmt[0] == KERN_SOH[0])
111 fmt += 2;
112
113 bch2_stdio_redirect_vprintf(stdio, true, fmt, args);
114 return;
115 }
116 #endif
117 vprintk(fmt, args);
118 }
119
120 void bch2_print_opts(struct bch_opts *opts, const char *fmt, ...)
121 {
122 struct stdio_redirect *stdio = (void *)(unsigned long)opts->stdio;
123
124 va_list args;
125 va_start(args, fmt);
126 bch2_print_maybe_redirect(stdio, fmt, args);
127 va_end(args);
128 }
129
130 void __bch2_print(struct bch_fs *c, const char *fmt, ...)
131 {
132 struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c);
133
134 va_list args;
135 va_start(args, fmt);
136 bch2_print_maybe_redirect(stdio, fmt, args);
137 va_end(args);
138 }
139
140 #define KTYPE(type) \
141 static const struct attribute_group type ## _group = { \
142 .attrs = type ## _files \
143 }; \
144 \
145 static const struct attribute_group *type ## _groups[] = { \
146 &type ## _group, \
147 NULL \
148 }; \
149 \
150 static const struct kobj_type type ## _ktype = { \
151 .release = type ## _release, \
152 .sysfs_ops = &type ## _sysfs_ops, \
153 .default_groups = type ## _groups \
154 }
155
156 static void bch2_fs_release(struct kobject *);
157 static void bch2_dev_release(struct kobject *);
158 static void bch2_fs_counters_release(struct kobject *k)
159 {
160 }
161
162 static void bch2_fs_internal_release(struct kobject *k)
163 {
164 }
165
166 static void bch2_fs_opts_dir_release(struct kobject *k)
167 {
168 }
169
170 static void bch2_fs_time_stats_release(struct kobject *k)
171 {
172 }
173
174 KTYPE(bch2_fs);
175 KTYPE(bch2_fs_counters);
176 KTYPE(bch2_fs_internal);
177 KTYPE(bch2_fs_opts_dir);
178 KTYPE(bch2_fs_time_stats);
179 KTYPE(bch2_dev);
180
181 static struct kset *bcachefs_kset;
182 static LIST_HEAD(bch_fs_list);
183 static DEFINE_MUTEX(bch_fs_list_lock);
184
185 DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);
186
187 static void bch2_dev_unlink(struct bch_dev *);
188 static void bch2_dev_free(struct bch_dev *);
189 static int bch2_dev_alloc(struct bch_fs *, unsigned);
190 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
191 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
192
193 struct bch_fs *bch2_dev_to_fs(dev_t dev)
194 {
195 struct bch_fs *c;
196
197 mutex_lock(&bch_fs_list_lock);
198 rcu_read_lock();
199
200 list_for_each_entry(c, &bch_fs_list, list)
201 for_each_member_device_rcu(c, ca, NULL)
202 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
203 closure_get(&c->cl);
204 goto found;
205 }
206 c = NULL;
207 found:
208 rcu_read_unlock();
209 mutex_unlock(&bch_fs_list_lock);
210
211 return c;
212 }
213
214 static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)
215 {
216 struct bch_fs *c;
217
218 lockdep_assert_held(&bch_fs_list_lock);
219
220 list_for_each_entry(c, &bch_fs_list, list)
221 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))
222 return c;
223
224 return NULL;
225 }
226
227 struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)
228 {
229 struct bch_fs *c;
230
231 mutex_lock(&bch_fs_list_lock);
232 c = __bch2_uuid_to_fs(uuid);
233 if (c)
234 closure_get(&c->cl);
235 mutex_unlock(&bch_fs_list_lock);
236
237 return c;
238 }
239
240 /* Filesystem RO/RW: */
241
242 /*
243 * For startup/shutdown of RW stuff, the dependencies are:
244 *
245 * - foreground writes depend on copygc and rebalance (to free up space)
246 *
247 * - copygc and rebalance depend on mark and sweep gc (they actually probably
248 * don't because they either reserve ahead of time or don't block if
249 * allocations fail, but allocations can require mark and sweep gc to run
250 * because of generation number wraparound)
251 *
252 * - all of the above depends on the allocator threads
253 *
254 * - allocator depends on the journal (when it rewrites prios and gens)
255 */
256
257 static void __bch2_fs_read_only(struct bch_fs *c)
258 {
259 unsigned clean_passes = 0;
260 u64 seq = 0;
261
262 bch2_fs_ec_stop(c);
263 bch2_open_buckets_stop(c, NULL, true);
264 bch2_rebalance_stop(c);
265 bch2_copygc_stop(c);
266 bch2_fs_ec_flush(c);
267
268 bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",
269 journal_cur_seq(&c->journal));
270
271 do {
272 clean_passes++;
273
274 if (bch2_btree_interior_updates_flush(c) ||
275 bch2_btree_write_buffer_flush_going_ro(c) ||
276 bch2_journal_flush_all_pins(&c->journal) ||
277 bch2_btree_flush_all_writes(c) ||
278 seq != atomic64_read(&c->journal.seq)) {
279 seq = atomic64_read(&c->journal.seq);
280 clean_passes = 0;
281 }
282 } while (clean_passes < 2);
283
284 bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu",
285 journal_cur_seq(&c->journal));
286
287 if (test_bit(JOURNAL_replay_done, &c->journal.flags) &&
288 !test_bit(BCH_FS_emergency_ro, &c->flags))
289 set_bit(BCH_FS_clean_shutdown, &c->flags);
290
291 bch2_fs_journal_stop(&c->journal);
292
293 bch_info(c, "%sclean shutdown complete, journal seq %llu",
294 test_bit(BCH_FS_clean_shutdown, &c->flags) ? "" : "un",
295 c->journal.seq_ondisk);
296
297 /*
298 * After stopping journal:
299 */
300 for_each_member_device(c, ca)
301 bch2_dev_allocator_remove(c, ca);
302 }
303
304 #ifndef BCH_WRITE_REF_DEBUG
305 static void bch2_writes_disabled(struct percpu_ref *writes)
306 {
307 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
308
309 set_bit(BCH_FS_write_disable_complete, &c->flags);
310 wake_up(&bch2_read_only_wait);
311 }
312 #endif
313
314 void bch2_fs_read_only(struct bch_fs *c)
315 {
316 if (!test_bit(BCH_FS_rw, &c->flags)) {
317 bch2_journal_reclaim_stop(&c->journal);
318 return;
319 }
320
321 BUG_ON(test_bit(BCH_FS_write_disable_complete, &c->flags));
322
323 bch_verbose(c, "going read-only");
324
325 /*
326 * Block new foreground-end write operations from starting - any new
327 * writes will return -EROFS:
328 */
329 set_bit(BCH_FS_going_ro, &c->flags);
330 #ifndef BCH_WRITE_REF_DEBUG
331 percpu_ref_kill(&c->writes);
332 #else
333 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
334 bch2_write_ref_put(c, i);
335 #endif
336
337 /*
338 * If we're not doing an emergency shutdown, we want to wait on
339 * outstanding writes to complete so they don't see spurious errors due
340 * to shutting down the allocator:
341 *
342 * If we are doing an emergency shutdown outstanding writes may
343 * hang until we shutdown the allocator so we don't want to wait
344 * on outstanding writes before shutting everything down - but
345 * we do need to wait on them before returning and signalling
346 * that going RO is complete:
347 */
348 wait_event(bch2_read_only_wait,
349 test_bit(BCH_FS_write_disable_complete, &c->flags) ||
350 test_bit(BCH_FS_emergency_ro, &c->flags));
351
352 bool writes_disabled = test_bit(BCH_FS_write_disable_complete, &c->flags);
353 if (writes_disabled)
354 bch_verbose(c, "finished waiting for writes to stop");
355
356 __bch2_fs_read_only(c);
357
358 wait_event(bch2_read_only_wait,
359 test_bit(BCH_FS_write_disable_complete, &c->flags));
360
361 if (!writes_disabled)
362 bch_verbose(c, "finished waiting for writes to stop");
363
364 clear_bit(BCH_FS_write_disable_complete, &c->flags);
365 clear_bit(BCH_FS_going_ro, &c->flags);
366 clear_bit(BCH_FS_rw, &c->flags);
367
368 if (!bch2_journal_error(&c->journal) &&
369 !test_bit(BCH_FS_error, &c->flags) &&
370 !test_bit(BCH_FS_emergency_ro, &c->flags) &&
371 test_bit(BCH_FS_started, &c->flags) &&
372 test_bit(BCH_FS_clean_shutdown, &c->flags) &&
373 c->recovery_pass_done >= BCH_RECOVERY_PASS_journal_replay) {
374 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal));
375 BUG_ON(atomic_long_read(&c->btree_cache.nr_dirty));
376 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty));
377 BUG_ON(c->btree_write_buffer.inc.keys.nr);
378 BUG_ON(c->btree_write_buffer.flushing.keys.nr);
379 bch2_verify_accounting_clean(c);
380
381 bch_verbose(c, "marking filesystem clean");
382 bch2_fs_mark_clean(c);
383 } else {
384 bch_verbose(c, "done going read-only, filesystem not clean");
385 }
386 }
387
388 static void bch2_fs_read_only_work(struct work_struct *work)
389 {
390 struct bch_fs *c =
391 container_of(work, struct bch_fs, read_only_work);
392
393 down_write(&c->state_lock);
394 bch2_fs_read_only(c);
395 up_write(&c->state_lock);
396 }
397
398 static void bch2_fs_read_only_async(struct bch_fs *c)
399 {
400 queue_work(system_long_wq, &c->read_only_work);
401 }
402
403 bool bch2_fs_emergency_read_only(struct bch_fs *c)
404 {
405 bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags);
406
407 bch2_journal_halt(&c->journal);
408 bch2_fs_read_only_async(c);
409
410 wake_up(&bch2_read_only_wait);
411 return ret;
412 }
413
414 static int bch2_fs_read_write_late(struct bch_fs *c)
415 {
416 int ret;
417
418 /*
419 * Data move operations can't run until after check_snapshots has
420 * completed, and bch2_snapshot_is_ancestor() is available.
421 *
422 * Ideally we'd start copygc/rebalance earlier instead of waiting for
423 * all of recovery/fsck to complete:
424 */
425 ret = bch2_copygc_start(c);
426 if (ret) {
427 bch_err(c, "error starting copygc thread");
428 return ret;
429 }
430
431 ret = bch2_rebalance_start(c);
432 if (ret) {
433 bch_err(c, "error starting rebalance thread");
434 return ret;
435 }
436
437 return 0;
438 }
439
440 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
441 {
442 int ret;
443
444 BUG_ON(!test_bit(BCH_FS_may_go_rw, &c->flags));
445
446 if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) {
447 bch_err(c, "cannot go rw, unfixed btree errors");
448 return -BCH_ERR_erofs_unfixed_errors;
449 }
450
451 if (test_bit(BCH_FS_rw, &c->flags))
452 return 0;
453
454 bch_info(c, "going read-write");
455
456 ret = bch2_sb_members_v2_init(c);
457 if (ret)
458 goto err;
459
460 ret = bch2_fs_mark_dirty(c);
461 if (ret)
462 goto err;
463
464 clear_bit(BCH_FS_clean_shutdown, &c->flags);
465
466 /*
467 * First journal write must be a flush write: after a clean shutdown we
468 * don't read the journal, so the first journal write may end up
469 * overwriting whatever was there previously, and there must always be
470 * at least one non-flush write in the journal or recovery will fail:
471 */
472 set_bit(JOURNAL_need_flush_write, &c->journal.flags);
473 set_bit(JOURNAL_running, &c->journal.flags);
474
475 for_each_rw_member(c, ca)
476 bch2_dev_allocator_add(c, ca);
477 bch2_recalc_capacity(c);
478
479 set_bit(BCH_FS_rw, &c->flags);
480 set_bit(BCH_FS_was_rw, &c->flags);
481
482 #ifndef BCH_WRITE_REF_DEBUG
483 percpu_ref_reinit(&c->writes);
484 #else
485 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) {
486 BUG_ON(atomic_long_read(&c->writes[i]));
487 atomic_long_inc(&c->writes[i]);
488 }
489 #endif
490
491 ret = bch2_journal_reclaim_start(&c->journal);
492 if (ret)
493 goto err;
494
495 if (!early) {
496 ret = bch2_fs_read_write_late(c);
497 if (ret)
498 goto err;
499 }
500
501 bch2_do_discards(c);
502 bch2_do_invalidates(c);
503 bch2_do_stripe_deletes(c);
504 bch2_do_pending_node_rewrites(c);
505 return 0;
506 err:
507 if (test_bit(BCH_FS_rw, &c->flags))
508 bch2_fs_read_only(c);
509 else
510 __bch2_fs_read_only(c);
511 return ret;
512 }
513
514 int bch2_fs_read_write(struct bch_fs *c)
515 {
516 if (c->opts.recovery_pass_last &&
517 c->opts.recovery_pass_last < BCH_RECOVERY_PASS_journal_replay)
518 return -BCH_ERR_erofs_norecovery;
519
520 if (c->opts.nochanges)
521 return -BCH_ERR_erofs_nochanges;
522
523 return __bch2_fs_read_write(c, false);
524 }
525
526 int bch2_fs_read_write_early(struct bch_fs *c)
527 {
528 lockdep_assert_held(&c->state_lock);
529
530 return __bch2_fs_read_write(c, true);
531 }
532
533 /* Filesystem startup/shutdown: */
534
535 static void __bch2_fs_free(struct bch_fs *c)
536 {
537 for (unsigned i = 0; i < BCH_TIME_STAT_NR; i++)
538 bch2_time_stats_exit(&c->times[i]);
539
540 bch2_find_btree_nodes_exit(&c->found_btree_nodes);
541 bch2_free_pending_node_rewrites(c);
542 bch2_fs_accounting_exit(c);
543 bch2_fs_sb_errors_exit(c);
544 bch2_fs_counters_exit(c);
545 bch2_fs_snapshots_exit(c);
546 bch2_fs_quota_exit(c);
547 bch2_fs_fs_io_direct_exit(c);
548 bch2_fs_fs_io_buffered_exit(c);
549 bch2_fs_fsio_exit(c);
550 bch2_fs_vfs_exit(c);
551 bch2_fs_ec_exit(c);
552 bch2_fs_encryption_exit(c);
553 bch2_fs_nocow_locking_exit(c);
554 bch2_fs_io_write_exit(c);
555 bch2_fs_io_read_exit(c);
556 bch2_fs_buckets_waiting_for_journal_exit(c);
557 bch2_fs_btree_interior_update_exit(c);
558 bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
559 bch2_fs_btree_cache_exit(c);
560 bch2_fs_btree_iter_exit(c);
561 bch2_fs_replicas_exit(c);
562 bch2_fs_journal_exit(&c->journal);
563 bch2_io_clock_exit(&c->io_clock[WRITE]);
564 bch2_io_clock_exit(&c->io_clock[READ]);
565 bch2_fs_compress_exit(c);
566 bch2_journal_keys_put_initial(c);
567 bch2_find_btree_nodes_exit(&c->found_btree_nodes);
568 BUG_ON(atomic_read(&c->journal_keys.ref));
569 bch2_fs_btree_write_buffer_exit(c);
570 percpu_free_rwsem(&c->mark_lock);
571 if (c->online_reserved) {
572 u64 v = percpu_u64_get(c->online_reserved);
573 WARN(v, "online_reserved not 0 at shutdown: %lli", v);
574 free_percpu(c->online_reserved);
575 }
576
577 darray_exit(&c->btree_roots_extra);
578 free_percpu(c->pcpu);
579 free_percpu(c->usage);
580 mempool_exit(&c->large_bkey_pool);
581 mempool_exit(&c->btree_bounce_pool);
582 bioset_exit(&c->btree_bio);
583 mempool_exit(&c->fill_iter);
584 #ifndef BCH_WRITE_REF_DEBUG
585 percpu_ref_exit(&c->writes);
586 #endif
587 kfree(rcu_dereference_protected(c->disk_groups, 1));
588 kfree(c->journal_seq_blacklist_table);
589 kfree(c->unused_inode_hints);
590
591 if (c->write_ref_wq)
592 destroy_workqueue(c->write_ref_wq);
593 if (c->btree_write_submit_wq)
594 destroy_workqueue(c->btree_write_submit_wq);
595 if (c->btree_read_complete_wq)
596 destroy_workqueue(c->btree_read_complete_wq);
597 if (c->copygc_wq)
598 destroy_workqueue(c->copygc_wq);
599 if (c->btree_io_complete_wq)
600 destroy_workqueue(c->btree_io_complete_wq);
601 if (c->btree_update_wq)
602 destroy_workqueue(c->btree_update_wq);
603
604 bch2_free_super(&c->disk_sb);
605 kvfree(c);
606 module_put(THIS_MODULE);
607 }
608
609 static void bch2_fs_release(struct kobject *kobj)
610 {
611 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
612
613 __bch2_fs_free(c);
614 }
615
616 void __bch2_fs_stop(struct bch_fs *c)
617 {
618 bch_verbose(c, "shutting down");
619
620 set_bit(BCH_FS_stopping, &c->flags);
621
622 down_write(&c->state_lock);
623 bch2_fs_read_only(c);
624 up_write(&c->state_lock);
625
626 for_each_member_device(c, ca)
627 bch2_dev_unlink(ca);
628
629 if (c->kobj.state_in_sysfs)
630 kobject_del(&c->kobj);
631
632 bch2_fs_debug_exit(c);
633 bch2_fs_chardev_exit(c);
634
635 bch2_ro_ref_put(c);
636 wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref));
637
638 kobject_put(&c->counters_kobj);
639 kobject_put(&c->time_stats);
640 kobject_put(&c->opts_dir);
641 kobject_put(&c->internal);
642
643 /* btree prefetch might have kicked off reads in the background: */
644 bch2_btree_flush_all_reads(c);
645
646 for_each_member_device(c, ca)
647 cancel_work_sync(&ca->io_error_work);
648
649 cancel_work_sync(&c->read_only_work);
650 }
651
652 void bch2_fs_free(struct bch_fs *c)
653 {
654 unsigned i;
655
656 mutex_lock(&bch_fs_list_lock);
657 list_del(&c->list);
658 mutex_unlock(&bch_fs_list_lock);
659
660 closure_sync(&c->cl);
661 closure_debug_destroy(&c->cl);
662
663 for (i = 0; i < c->sb.nr_devices; i++) {
664 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true);
665
666 if (ca) {
667 EBUG_ON(atomic_long_read(&ca->ref) != 1);
668 bch2_free_super(&ca->disk_sb);
669 bch2_dev_free(ca);
670 }
671 }
672
673 bch_verbose(c, "shutdown complete");
674
675 kobject_put(&c->kobj);
676 }
677
678 void bch2_fs_stop(struct bch_fs *c)
679 {
680 __bch2_fs_stop(c);
681 bch2_fs_free(c);
682 }
683
684 static int bch2_fs_online(struct bch_fs *c)
685 {
686 int ret = 0;
687
688 lockdep_assert_held(&bch_fs_list_lock);
689
690 if (__bch2_uuid_to_fs(c->sb.uuid)) {
691 bch_err(c, "filesystem UUID already open");
692 return -EINVAL;
693 }
694
695 ret = bch2_fs_chardev_init(c);
696 if (ret) {
697 bch_err(c, "error creating character device");
698 return ret;
699 }
700
701 bch2_fs_debug_init(c);
702
703 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
704 kobject_add(&c->internal, &c->kobj, "internal") ?:
705 kobject_add(&c->opts_dir, &c->kobj, "options") ?:
706 #ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
707 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
708 #endif
709 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
710 bch2_opts_create_sysfs_files(&c->opts_dir);
711 if (ret) {
712 bch_err(c, "error creating sysfs objects");
713 return ret;
714 }
715
716 down_write(&c->state_lock);
717
718 for_each_member_device(c, ca) {
719 ret = bch2_dev_sysfs_online(c, ca);
720 if (ret) {
721 bch_err(c, "error creating sysfs objects");
722 bch2_dev_put(ca);
723 goto err;
724 }
725 }
726
727 BUG_ON(!list_empty(&c->list));
728 list_add(&c->list, &bch_fs_list);
729 err:
730 up_write(&c->state_lock);
731 return ret;
732 }
733
734 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
735 {
736 struct bch_fs *c;
737 struct printbuf name = PRINTBUF;
738 unsigned i, iter_size;
739 int ret = 0;
740
741 c = kvmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
742 if (!c) {
743 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc);
744 goto out;
745 }
746
747 c->stdio = (void *)(unsigned long) opts.stdio;
748
749 __module_get(THIS_MODULE);
750
751 closure_init(&c->cl, NULL);
752
753 c->kobj.kset = bcachefs_kset;
754 kobject_init(&c->kobj, &bch2_fs_ktype);
755 kobject_init(&c->internal, &bch2_fs_internal_ktype);
756 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
757 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
758 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
759
760 c->minor = -1;
761 c->disk_sb.fs_sb = true;
762
763 init_rwsem(&c->state_lock);
764 mutex_init(&c->sb_lock);
765 mutex_init(&c->replicas_gc_lock);
766 mutex_init(&c->btree_root_lock);
767 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
768
769 refcount_set(&c->ro_ref, 1);
770 init_waitqueue_head(&c->ro_ref_wait);
771 spin_lock_init(&c->recovery_pass_lock);
772 sema_init(&c->online_fsck_mutex, 1);
773
774 init_rwsem(&c->gc_lock);
775 mutex_init(&c->gc_gens_lock);
776
777 for (i = 0; i < BCH_TIME_STAT_NR; i++)
778 bch2_time_stats_init(&c->times[i]);
779
780 bch2_fs_gc_init(c);
781 bch2_fs_copygc_init(c);
782 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
783 bch2_fs_btree_iter_init_early(c);
784 bch2_fs_btree_interior_update_init_early(c);
785 bch2_fs_journal_keys_init(c);
786 bch2_fs_allocator_background_init(c);
787 bch2_fs_allocator_foreground_init(c);
788 bch2_fs_rebalance_init(c);
789 bch2_fs_quota_init(c);
790 bch2_fs_ec_init_early(c);
791 bch2_fs_move_init(c);
792 bch2_fs_sb_errors_init_early(c);
793
794 INIT_LIST_HEAD(&c->list);
795
796 mutex_init(&c->bio_bounce_pages_lock);
797 mutex_init(&c->snapshot_table_lock);
798 init_rwsem(&c->snapshot_create_lock);
799
800 spin_lock_init(&c->btree_write_error_lock);
801
802 INIT_LIST_HEAD(&c->journal_iters);
803
804 INIT_LIST_HEAD(&c->fsck_error_msgs);
805 mutex_init(&c->fsck_error_msgs_lock);
806
807 seqcount_init(&c->usage_lock);
808
809 sema_init(&c->io_in_flight, 128);
810
811 INIT_LIST_HEAD(&c->vfs_inodes_list);
812 mutex_init(&c->vfs_inodes_lock);
813
814 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write];
815 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write];
816 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
817
818 bch2_fs_btree_cache_init_early(&c->btree_cache);
819
820 mutex_init(&c->sectors_available_lock);
821
822 ret = percpu_init_rwsem(&c->mark_lock);
823 if (ret)
824 goto err;
825
826 mutex_lock(&c->sb_lock);
827 ret = bch2_sb_to_fs(c, sb);
828 mutex_unlock(&c->sb_lock);
829
830 if (ret)
831 goto err;
832
833 pr_uuid(&name, c->sb.user_uuid.b);
834 ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0;
835 if (ret)
836 goto err;
837
838 strscpy(c->name, name.buf, sizeof(c->name));
839 printbuf_exit(&name);
840
841 /* Compat: */
842 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
843 !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
844 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
845
846 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
847 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
848 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
849
850 c->opts = bch2_opts_default;
851 ret = bch2_opts_from_sb(&c->opts, sb);
852 if (ret)
853 goto err;
854
855 bch2_opts_apply(&c->opts, opts);
856
857 c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
858 if (c->opts.inodes_use_key_cache)
859 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
860 c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops;
861
862 c->block_bits = ilog2(block_sectors(c));
863 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
864
865 if (bch2_fs_init_fault("fs_alloc")) {
866 bch_err(c, "fs_alloc fault injected");
867 ret = -EFAULT;
868 goto err;
869 }
870
871 iter_size = sizeof(struct sort_iter) +
872 (btree_blocks(c) + 1) * 2 *
873 sizeof(struct sort_iter_set);
874
875 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
876
877 if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
878 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_UNBOUND, 512)) ||
879 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
880 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
881 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
882 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
883 !(c->btree_read_complete_wq = alloc_workqueue("bcachefs_btree_read_complete",
884 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 512)) ||
885 !(c->btree_write_submit_wq = alloc_workqueue("bcachefs_btree_write_sumit",
886 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
887 !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref",
888 WQ_FREEZABLE, 0)) ||
889 #ifndef BCH_WRITE_REF_DEBUG
890 percpu_ref_init(&c->writes, bch2_writes_disabled,
891 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
892 #endif
893 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
894 bioset_init(&c->btree_bio, 1,
895 max(offsetof(struct btree_read_bio, bio),
896 offsetof(struct btree_write_bio, wbio.bio)),
897 BIOSET_NEED_BVECS) ||
898 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
899 !(c->usage = alloc_percpu(struct bch_fs_usage_base)) ||
900 !(c->online_reserved = alloc_percpu(u64)) ||
901 mempool_init_kvmalloc_pool(&c->btree_bounce_pool, 1,
902 c->opts.btree_node_size) ||
903 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
904 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
905 sizeof(u64), GFP_KERNEL))) {
906 ret = -BCH_ERR_ENOMEM_fs_other_alloc;
907 goto err;
908 }
909
910 ret = bch2_fs_counters_init(c) ?:
911 bch2_fs_sb_errors_init(c) ?:
912 bch2_io_clock_init(&c->io_clock[READ]) ?:
913 bch2_io_clock_init(&c->io_clock[WRITE]) ?:
914 bch2_fs_journal_init(&c->journal) ?:
915 bch2_fs_btree_iter_init(c) ?:
916 bch2_fs_btree_cache_init(c) ?:
917 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
918 bch2_fs_btree_interior_update_init(c) ?:
919 bch2_fs_buckets_waiting_for_journal_init(c) ?:
920 bch2_fs_btree_write_buffer_init(c) ?:
921 bch2_fs_subvolumes_init(c) ?:
922 bch2_fs_io_read_init(c) ?:
923 bch2_fs_io_write_init(c) ?:
924 bch2_fs_nocow_locking_init(c) ?:
925 bch2_fs_encryption_init(c) ?:
926 bch2_fs_compress_init(c) ?:
927 bch2_fs_ec_init(c) ?:
928 bch2_fs_vfs_init(c) ?:
929 bch2_fs_fsio_init(c) ?:
930 bch2_fs_fs_io_buffered_init(c) ?:
931 bch2_fs_fs_io_direct_init(c);
932 if (ret)
933 goto err;
934
935 for (i = 0; i < c->sb.nr_devices; i++) {
936 if (!bch2_member_exists(c->disk_sb.sb, i))
937 continue;
938 ret = bch2_dev_alloc(c, i);
939 if (ret)
940 goto err;
941 }
942
943 bch2_journal_entry_res_resize(&c->journal,
944 &c->btree_root_journal_res,
945 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
946 bch2_journal_entry_res_resize(&c->journal,
947 &c->clock_journal_res,
948 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
949
950 mutex_lock(&bch_fs_list_lock);
951 ret = bch2_fs_online(c);
952 mutex_unlock(&bch_fs_list_lock);
953
954 if (ret)
955 goto err;
956 out:
957 return c;
958 err:
959 bch2_fs_free(c);
960 c = ERR_PTR(ret);
961 goto out;
962 }
963
964 noinline_for_stack
965 static void print_mount_opts(struct bch_fs *c)
966 {
967 enum bch_opt_id i;
968 struct printbuf p = PRINTBUF;
969 bool first = true;
970
971 prt_str(&p, "starting version ");
972 bch2_version_to_text(&p, c->sb.version);
973
974 if (c->opts.read_only) {
975 prt_str(&p, " opts=");
976 first = false;
977 prt_printf(&p, "ro");
978 }
979
980 for (i = 0; i < bch2_opts_nr; i++) {
981 const struct bch_option *opt = &bch2_opt_table[i];
982 u64 v = bch2_opt_get_by_id(&c->opts, i);
983
984 if (!(opt->flags & OPT_MOUNT))
985 continue;
986
987 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
988 continue;
989
990 prt_str(&p, first ? " opts=" : ",");
991 first = false;
992 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);
993 }
994
995 bch_info(c, "%s", p.buf);
996 printbuf_exit(&p);
997 }
998
999 int bch2_fs_start(struct bch_fs *c)
1000 {
1001 time64_t now = ktime_get_real_seconds();
1002 int ret;
1003
1004 print_mount_opts(c);
1005
1006 down_write(&c->state_lock);
1007
1008 BUG_ON(test_bit(BCH_FS_started, &c->flags));
1009
1010 mutex_lock(&c->sb_lock);
1011
1012 ret = bch2_sb_members_v2_init(c);
1013 if (ret) {
1014 mutex_unlock(&c->sb_lock);
1015 goto err;
1016 }
1017
1018 for_each_online_member(c, ca)
1019 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = cpu_to_le64(now);
1020
1021 struct bch_sb_field_ext *ext =
1022 bch2_sb_field_get_minsize(&c->disk_sb, ext, sizeof(*ext) / sizeof(u64));
1023 mutex_unlock(&c->sb_lock);
1024
1025 if (!ext) {
1026 bch_err(c, "insufficient space in superblock for sb_field_ext");
1027 ret = -BCH_ERR_ENOSPC_sb;
1028 goto err;
1029 }
1030
1031 for_each_rw_member(c, ca)
1032 bch2_dev_allocator_add(c, ca);
1033 bch2_recalc_capacity(c);
1034
1035 c->recovery_task = current;
1036 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
1037 ? bch2_fs_recovery(c)
1038 : bch2_fs_initialize(c);
1039 c->recovery_task = NULL;
1040
1041 if (ret)
1042 goto err;
1043
1044 ret = bch2_opts_check_may_set(c);
1045 if (ret)
1046 goto err;
1047
1048 if (bch2_fs_init_fault("fs_start")) {
1049 bch_err(c, "fs_start fault injected");
1050 ret = -EINVAL;
1051 goto err;
1052 }
1053
1054 set_bit(BCH_FS_started, &c->flags);
1055
1056 if (c->opts.read_only) {
1057 bch2_fs_read_only(c);
1058 } else {
1059 ret = !test_bit(BCH_FS_rw, &c->flags)
1060 ? bch2_fs_read_write(c)
1061 : bch2_fs_read_write_late(c);
1062 if (ret)
1063 goto err;
1064 }
1065
1066 ret = 0;
1067 err:
1068 if (ret)
1069 bch_err_msg(c, ret, "starting filesystem");
1070 else
1071 bch_verbose(c, "done starting filesystem");
1072 up_write(&c->state_lock);
1073 return ret;
1074 }
1075
1076 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
1077 {
1078 struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx);
1079
1080 if (le16_to_cpu(sb->block_size) != block_sectors(c))
1081 return -BCH_ERR_mismatched_block_size;
1082
1083 if (le16_to_cpu(m.bucket_size) <
1084 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
1085 return -BCH_ERR_bucket_size_too_small;
1086
1087 return 0;
1088 }
1089
1090 static int bch2_dev_in_fs(struct bch_sb_handle *fs,
1091 struct bch_sb_handle *sb,
1092 struct bch_opts *opts)
1093 {
1094 if (fs == sb)
1095 return 0;
1096
1097 if (!uuid_equal(&fs->sb->uuid, &sb->sb->uuid))
1098 return -BCH_ERR_device_not_a_member_of_filesystem;
1099
1100 if (!bch2_member_exists(fs->sb, sb->sb->dev_idx))
1101 return -BCH_ERR_device_has_been_removed;
1102
1103 if (fs->sb->block_size != sb->sb->block_size)
1104 return -BCH_ERR_mismatched_block_size;
1105
1106 if (le16_to_cpu(fs->sb->version) < bcachefs_metadata_version_member_seq ||
1107 le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_member_seq)
1108 return 0;
1109
1110 if (fs->sb->seq == sb->sb->seq &&
1111 fs->sb->write_time != sb->sb->write_time) {
1112 struct printbuf buf = PRINTBUF;
1113
1114 prt_str(&buf, "Split brain detected between ");
1115 prt_bdevname(&buf, sb->bdev);
1116 prt_str(&buf, " and ");
1117 prt_bdevname(&buf, fs->bdev);
1118 prt_char(&buf, ':');
1119 prt_newline(&buf);
1120 prt_printf(&buf, "seq=%llu but write_time different, got", le64_to_cpu(sb->sb->seq));
1121 prt_newline(&buf);
1122
1123 prt_bdevname(&buf, fs->bdev);
1124 prt_char(&buf, ' ');
1125 bch2_prt_datetime(&buf, le64_to_cpu(fs->sb->write_time));
1126 prt_newline(&buf);
1127
1128 prt_bdevname(&buf, sb->bdev);
1129 prt_char(&buf, ' ');
1130 bch2_prt_datetime(&buf, le64_to_cpu(sb->sb->write_time));
1131 prt_newline(&buf);
1132
1133 if (!opts->no_splitbrain_check)
1134 prt_printf(&buf, "Not using older sb");
1135
1136 pr_err("%s", buf.buf);
1137 printbuf_exit(&buf);
1138
1139 if (!opts->no_splitbrain_check)
1140 return -BCH_ERR_device_splitbrain;
1141 }
1142
1143 struct bch_member m = bch2_sb_member_get(fs->sb, sb->sb->dev_idx);
1144 u64 seq_from_fs = le64_to_cpu(m.seq);
1145 u64 seq_from_member = le64_to_cpu(sb->sb->seq);
1146
1147 if (seq_from_fs && seq_from_fs < seq_from_member) {
1148 struct printbuf buf = PRINTBUF;
1149
1150 prt_str(&buf, "Split brain detected between ");
1151 prt_bdevname(&buf, sb->bdev);
1152 prt_str(&buf, " and ");
1153 prt_bdevname(&buf, fs->bdev);
1154 prt_char(&buf, ':');
1155 prt_newline(&buf);
1156
1157 prt_bdevname(&buf, fs->bdev);
1158 prt_str(&buf, " believes seq of ");
1159 prt_bdevname(&buf, sb->bdev);
1160 prt_printf(&buf, " to be %llu, but ", seq_from_fs);
1161 prt_bdevname(&buf, sb->bdev);
1162 prt_printf(&buf, " has %llu\n", seq_from_member);
1163
1164 if (!opts->no_splitbrain_check) {
1165 prt_str(&buf, "Not using ");
1166 prt_bdevname(&buf, sb->bdev);
1167 }
1168
1169 pr_err("%s", buf.buf);
1170 printbuf_exit(&buf);
1171
1172 if (!opts->no_splitbrain_check)
1173 return -BCH_ERR_device_splitbrain;
1174 }
1175
1176 return 0;
1177 }
1178
1179 /* Device startup/shutdown: */
1180
1181 static void bch2_dev_release(struct kobject *kobj)
1182 {
1183 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
1184
1185 kfree(ca);
1186 }
1187
1188 static void bch2_dev_free(struct bch_dev *ca)
1189 {
1190 cancel_work_sync(&ca->io_error_work);
1191
1192 bch2_dev_unlink(ca);
1193
1194 if (ca->kobj.state_in_sysfs)
1195 kobject_del(&ca->kobj);
1196
1197 bch2_free_super(&ca->disk_sb);
1198 bch2_dev_allocator_background_exit(ca);
1199 bch2_dev_journal_exit(ca);
1200
1201 free_percpu(ca->io_done);
1202 bch2_dev_buckets_free(ca);
1203 kfree(ca->sb_read_scratch);
1204
1205 bch2_time_stats_quantiles_exit(&ca->io_latency[WRITE]);
1206 bch2_time_stats_quantiles_exit(&ca->io_latency[READ]);
1207
1208 percpu_ref_exit(&ca->io_ref);
1209 #ifndef CONFIG_BCACHEFS_DEBUG
1210 percpu_ref_exit(&ca->ref);
1211 #endif
1212 kobject_put(&ca->kobj);
1213 }
1214
1215 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1216 {
1217
1218 lockdep_assert_held(&c->state_lock);
1219
1220 if (percpu_ref_is_zero(&ca->io_ref))
1221 return;
1222
1223 __bch2_dev_read_only(c, ca);
1224
1225 reinit_completion(&ca->io_ref_completion);
1226 percpu_ref_kill(&ca->io_ref);
1227 wait_for_completion(&ca->io_ref_completion);
1228
1229 bch2_dev_unlink(ca);
1230
1231 bch2_free_super(&ca->disk_sb);
1232 bch2_dev_journal_exit(ca);
1233 }
1234
1235 #ifndef CONFIG_BCACHEFS_DEBUG
1236 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1237 {
1238 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1239
1240 complete(&ca->ref_completion);
1241 }
1242 #endif
1243
1244 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1245 {
1246 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1247
1248 complete(&ca->io_ref_completion);
1249 }
1250
1251 static void bch2_dev_unlink(struct bch_dev *ca)
1252 {
1253 struct kobject *b;
1254
1255 /*
1256 * This is racy w.r.t. the underlying block device being hot-removed,
1257 * which removes it from sysfs.
1258 *
1259 * It'd be lovely if we had a way to handle this race, but the sysfs
1260 * code doesn't appear to provide a good method and block/holder.c is
1261 * susceptible as well:
1262 */
1263 if (ca->kobj.state_in_sysfs &&
1264 ca->disk_sb.bdev &&
1265 (b = bdev_kobj(ca->disk_sb.bdev))->state_in_sysfs) {
1266 sysfs_remove_link(b, "bcachefs");
1267 sysfs_remove_link(&ca->kobj, "block");
1268 }
1269 }
1270
1271 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1272 {
1273 int ret;
1274
1275 if (!c->kobj.state_in_sysfs)
1276 return 0;
1277
1278 if (!ca->kobj.state_in_sysfs) {
1279 ret = kobject_add(&ca->kobj, &c->kobj,
1280 "dev-%u", ca->dev_idx);
1281 if (ret)
1282 return ret;
1283 }
1284
1285 if (ca->disk_sb.bdev) {
1286 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1287
1288 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1289 if (ret)
1290 return ret;
1291
1292 ret = sysfs_create_link(&ca->kobj, block, "block");
1293 if (ret)
1294 return ret;
1295 }
1296
1297 return 0;
1298 }
1299
1300 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1301 struct bch_member *member)
1302 {
1303 struct bch_dev *ca;
1304 unsigned i;
1305
1306 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1307 if (!ca)
1308 return NULL;
1309
1310 kobject_init(&ca->kobj, &bch2_dev_ktype);
1311 init_completion(&ca->ref_completion);
1312 init_completion(&ca->io_ref_completion);
1313
1314 init_rwsem(&ca->bucket_lock);
1315
1316 INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1317
1318 bch2_time_stats_quantiles_init(&ca->io_latency[READ]);
1319 bch2_time_stats_quantiles_init(&ca->io_latency[WRITE]);
1320
1321 ca->mi = bch2_mi_to_cpu(member);
1322
1323 for (i = 0; i < ARRAY_SIZE(member->errors); i++)
1324 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i]));
1325
1326 ca->uuid = member->uuid;
1327
1328 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
1329 ca->mi.bucket_size / btree_sectors(c));
1330
1331 #ifndef CONFIG_BCACHEFS_DEBUG
1332 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, 0, GFP_KERNEL))
1333 goto err;
1334 #else
1335 atomic_long_set(&ca->ref, 1);
1336 #endif
1337
1338 bch2_dev_allocator_background_init(ca);
1339
1340 if (percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1341 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1342 !(ca->sb_read_scratch = kmalloc(BCH_SB_READ_SCRATCH_BUF_SIZE, GFP_KERNEL)) ||
1343 bch2_dev_buckets_alloc(c, ca) ||
1344 !(ca->io_done = alloc_percpu(*ca->io_done)))
1345 goto err;
1346
1347 return ca;
1348 err:
1349 bch2_dev_free(ca);
1350 return NULL;
1351 }
1352
1353 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1354 unsigned dev_idx)
1355 {
1356 ca->dev_idx = dev_idx;
1357 __set_bit(ca->dev_idx, ca->self.d);
1358 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1359
1360 ca->fs = c;
1361 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1362
1363 if (bch2_dev_sysfs_online(c, ca))
1364 pr_warn("error creating sysfs objects");
1365 }
1366
1367 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1368 {
1369 struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx);
1370 struct bch_dev *ca = NULL;
1371
1372 if (bch2_fs_init_fault("dev_alloc"))
1373 goto err;
1374
1375 ca = __bch2_dev_alloc(c, &member);
1376 if (!ca)
1377 goto err;
1378
1379 ca->fs = c;
1380
1381 bch2_dev_attach(c, ca, dev_idx);
1382 return 0;
1383 err:
1384 return -BCH_ERR_ENOMEM_dev_alloc;
1385 }
1386
1387 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1388 {
1389 unsigned ret;
1390
1391 if (bch2_dev_is_online(ca)) {
1392 bch_err(ca, "already have device online in slot %u",
1393 sb->sb->dev_idx);
1394 return -BCH_ERR_device_already_online;
1395 }
1396
1397 if (get_capacity(sb->bdev->bd_disk) <
1398 ca->mi.bucket_size * ca->mi.nbuckets) {
1399 bch_err(ca, "cannot online: device too small");
1400 return -BCH_ERR_device_size_too_small;
1401 }
1402
1403 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1404
1405 ret = bch2_dev_journal_init(ca, sb->sb);
1406 if (ret)
1407 return ret;
1408
1409 /* Commit: */
1410 ca->disk_sb = *sb;
1411 memset(sb, 0, sizeof(*sb));
1412
1413 ca->dev = ca->disk_sb.bdev->bd_dev;
1414
1415 percpu_ref_reinit(&ca->io_ref);
1416
1417 return 0;
1418 }
1419
1420 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1421 {
1422 struct bch_dev *ca;
1423 int ret;
1424
1425 lockdep_assert_held(&c->state_lock);
1426
1427 if (le64_to_cpu(sb->sb->seq) >
1428 le64_to_cpu(c->disk_sb.sb->seq))
1429 bch2_sb_to_fs(c, sb->sb);
1430
1431 BUG_ON(!bch2_dev_exists(c, sb->sb->dev_idx));
1432
1433 ca = bch2_dev_locked(c, sb->sb->dev_idx);
1434
1435 ret = __bch2_dev_attach_bdev(ca, sb);
1436 if (ret)
1437 return ret;
1438
1439 bch2_dev_sysfs_online(c, ca);
1440
1441 struct printbuf name = PRINTBUF;
1442 prt_bdevname(&name, ca->disk_sb.bdev);
1443
1444 if (c->sb.nr_devices == 1)
1445 strscpy(c->name, name.buf, sizeof(c->name));
1446 strscpy(ca->name, name.buf, sizeof(ca->name));
1447
1448 printbuf_exit(&name);
1449
1450 rebalance_wakeup(c);
1451 return 0;
1452 }
1453
1454 /* Device management: */
1455
1456 /*
1457 * Note: this function is also used by the error paths - when a particular
1458 * device sees an error, we call it to determine whether we can just set the
1459 * device RO, or - if this function returns false - we'll set the whole
1460 * filesystem RO:
1461 *
1462 * XXX: maybe we should be more explicit about whether we're changing state
1463 * because we got an error or what have you?
1464 */
1465 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1466 enum bch_member_state new_state, int flags)
1467 {
1468 struct bch_devs_mask new_online_devs;
1469 int nr_rw = 0, required;
1470
1471 lockdep_assert_held(&c->state_lock);
1472
1473 switch (new_state) {
1474 case BCH_MEMBER_STATE_rw:
1475 return true;
1476 case BCH_MEMBER_STATE_ro:
1477 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1478 return true;
1479
1480 /* do we have enough devices to write to? */
1481 for_each_member_device(c, ca2)
1482 if (ca2 != ca)
1483 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1484
1485 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1486 ? c->opts.metadata_replicas
1487 : metadata_replicas_required(c),
1488 !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1489 ? c->opts.data_replicas
1490 : data_replicas_required(c));
1491
1492 return nr_rw >= required;
1493 case BCH_MEMBER_STATE_failed:
1494 case BCH_MEMBER_STATE_spare:
1495 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1496 ca->mi.state != BCH_MEMBER_STATE_ro)
1497 return true;
1498
1499 /* do we have enough devices to read from? */
1500 new_online_devs = bch2_online_devs(c);
1501 __clear_bit(ca->dev_idx, new_online_devs.d);
1502
1503 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1504 default:
1505 BUG();
1506 }
1507 }
1508
1509 static bool bch2_fs_may_start(struct bch_fs *c)
1510 {
1511 struct bch_dev *ca;
1512 unsigned i, flags = 0;
1513
1514 if (c->opts.very_degraded)
1515 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1516
1517 if (c->opts.degraded)
1518 flags |= BCH_FORCE_IF_DEGRADED;
1519
1520 if (!c->opts.degraded &&
1521 !c->opts.very_degraded) {
1522 mutex_lock(&c->sb_lock);
1523
1524 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1525 if (!bch2_member_exists(c->disk_sb.sb, i))
1526 continue;
1527
1528 ca = bch2_dev_locked(c, i);
1529
1530 if (!bch2_dev_is_online(ca) &&
1531 (ca->mi.state == BCH_MEMBER_STATE_rw ||
1532 ca->mi.state == BCH_MEMBER_STATE_ro)) {
1533 mutex_unlock(&c->sb_lock);
1534 return false;
1535 }
1536 }
1537 mutex_unlock(&c->sb_lock);
1538 }
1539
1540 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1541 }
1542
1543 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1544 {
1545 /*
1546 * The allocator thread itself allocates btree nodes, so stop it first:
1547 */
1548 bch2_dev_allocator_remove(c, ca);
1549 bch2_recalc_capacity(c);
1550 bch2_dev_journal_stop(&c->journal, ca);
1551 }
1552
1553 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1554 {
1555 lockdep_assert_held(&c->state_lock);
1556
1557 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1558
1559 bch2_dev_allocator_add(c, ca);
1560 bch2_recalc_capacity(c);
1561 bch2_dev_do_discards(ca);
1562 }
1563
1564 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1565 enum bch_member_state new_state, int flags)
1566 {
1567 struct bch_member *m;
1568 int ret = 0;
1569
1570 if (ca->mi.state == new_state)
1571 return 0;
1572
1573 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1574 return -BCH_ERR_device_state_not_allowed;
1575
1576 if (new_state != BCH_MEMBER_STATE_rw)
1577 __bch2_dev_read_only(c, ca);
1578
1579 bch_notice(ca, "%s", bch2_member_states[new_state]);
1580
1581 mutex_lock(&c->sb_lock);
1582 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1583 SET_BCH_MEMBER_STATE(m, new_state);
1584 bch2_write_super(c);
1585 mutex_unlock(&c->sb_lock);
1586
1587 if (new_state == BCH_MEMBER_STATE_rw)
1588 __bch2_dev_read_write(c, ca);
1589
1590 rebalance_wakeup(c);
1591
1592 return ret;
1593 }
1594
1595 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1596 enum bch_member_state new_state, int flags)
1597 {
1598 int ret;
1599
1600 down_write(&c->state_lock);
1601 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1602 up_write(&c->state_lock);
1603
1604 return ret;
1605 }
1606
1607 /* Device add/removal: */
1608
1609 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1610 {
1611 struct bch_member *m;
1612 unsigned dev_idx = ca->dev_idx, data;
1613 int ret;
1614
1615 down_write(&c->state_lock);
1616
1617 /*
1618 * We consume a reference to ca->ref, regardless of whether we succeed
1619 * or fail:
1620 */
1621 bch2_dev_put(ca);
1622
1623 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1624 bch_err(ca, "Cannot remove without losing data");
1625 ret = -BCH_ERR_device_state_not_allowed;
1626 goto err;
1627 }
1628
1629 __bch2_dev_read_only(c, ca);
1630
1631 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1632 bch_err_msg(ca, ret, "bch2_dev_data_drop()");
1633 if (ret)
1634 goto err;
1635
1636 ret = bch2_dev_remove_alloc(c, ca);
1637 bch_err_msg(ca, ret, "bch2_dev_remove_alloc()");
1638 if (ret)
1639 goto err;
1640
1641 /*
1642 * We need to flush the entire journal to get rid of keys that reference
1643 * the device being removed before removing the superblock entry
1644 */
1645 bch2_journal_flush_all_pins(&c->journal);
1646
1647 /*
1648 * this is really just needed for the bch2_replicas_gc_(start|end)
1649 * calls, and could be cleaned up:
1650 */
1651 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1652 bch_err_msg(ca, ret, "bch2_journal_flush_device_pins()");
1653 if (ret)
1654 goto err;
1655
1656 ret = bch2_journal_flush(&c->journal);
1657 bch_err_msg(ca, ret, "bch2_journal_flush()");
1658 if (ret)
1659 goto err;
1660
1661 ret = bch2_replicas_gc2(c);
1662 bch_err_msg(ca, ret, "bch2_replicas_gc2()");
1663 if (ret)
1664 goto err;
1665
1666 data = bch2_dev_has_data(c, ca);
1667 if (data) {
1668 struct printbuf data_has = PRINTBUF;
1669
1670 prt_bitflags(&data_has, __bch2_data_types, data);
1671 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
1672 printbuf_exit(&data_has);
1673 ret = -EBUSY;
1674 goto err;
1675 }
1676
1677 __bch2_dev_offline(c, ca);
1678
1679 mutex_lock(&c->sb_lock);
1680 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1681 mutex_unlock(&c->sb_lock);
1682
1683 #ifndef CONFIG_BCACHEFS_DEBUG
1684 percpu_ref_kill(&ca->ref);
1685 #else
1686 ca->dying = true;
1687 bch2_dev_put(ca);
1688 #endif
1689 wait_for_completion(&ca->ref_completion);
1690
1691 bch2_dev_free(ca);
1692
1693 /*
1694 * Free this device's slot in the bch_member array - all pointers to
1695 * this device must be gone:
1696 */
1697 mutex_lock(&c->sb_lock);
1698 m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1699 memset(&m->uuid, 0, sizeof(m->uuid));
1700
1701 bch2_write_super(c);
1702
1703 mutex_unlock(&c->sb_lock);
1704 up_write(&c->state_lock);
1705 return 0;
1706 err:
1707 if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1708 !percpu_ref_is_zero(&ca->io_ref))
1709 __bch2_dev_read_write(c, ca);
1710 up_write(&c->state_lock);
1711 return ret;
1712 }
1713
1714 /* Add new device to running filesystem: */
1715 int bch2_dev_add(struct bch_fs *c, const char *path)
1716 {
1717 struct bch_opts opts = bch2_opts_empty();
1718 struct bch_sb_handle sb;
1719 struct bch_dev *ca = NULL;
1720 struct printbuf errbuf = PRINTBUF;
1721 struct printbuf label = PRINTBUF;
1722 int ret;
1723
1724 ret = bch2_read_super(path, &opts, &sb);
1725 bch_err_msg(c, ret, "reading super");
1726 if (ret)
1727 goto err;
1728
1729 struct bch_member dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx);
1730
1731 if (BCH_MEMBER_GROUP(&dev_mi)) {
1732 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
1733 if (label.allocation_failure) {
1734 ret = -ENOMEM;
1735 goto err;
1736 }
1737 }
1738
1739 ret = bch2_dev_may_add(sb.sb, c);
1740 if (ret)
1741 goto err;
1742
1743 ca = __bch2_dev_alloc(c, &dev_mi);
1744 if (!ca) {
1745 ret = -ENOMEM;
1746 goto err;
1747 }
1748
1749 ret = __bch2_dev_attach_bdev(ca, &sb);
1750 if (ret)
1751 goto err;
1752
1753 down_write(&c->state_lock);
1754 mutex_lock(&c->sb_lock);
1755
1756 ret = bch2_sb_from_fs(c, ca);
1757 bch_err_msg(c, ret, "setting up new superblock");
1758 if (ret)
1759 goto err_unlock;
1760
1761 if (dynamic_fault("bcachefs:add:no_slot"))
1762 goto err_unlock;
1763
1764 ret = bch2_sb_member_alloc(c);
1765 if (ret < 0) {
1766 bch_err_msg(c, ret, "setting up new superblock");
1767 goto err_unlock;
1768 }
1769 unsigned dev_idx = ret;
1770
1771 /* success: */
1772
1773 dev_mi.last_mount = cpu_to_le64(ktime_get_real_seconds());
1774 *bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx) = dev_mi;
1775
1776 ca->disk_sb.sb->dev_idx = dev_idx;
1777 bch2_dev_attach(c, ca, dev_idx);
1778
1779 if (BCH_MEMBER_GROUP(&dev_mi)) {
1780 ret = __bch2_dev_group_set(c, ca, label.buf);
1781 bch_err_msg(c, ret, "creating new label");
1782 if (ret)
1783 goto err_unlock;
1784 }
1785
1786 bch2_write_super(c);
1787 mutex_unlock(&c->sb_lock);
1788
1789 ret = bch2_dev_usage_init(ca, false);
1790 if (ret)
1791 goto err_late;
1792
1793 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);
1794 bch_err_msg(ca, ret, "marking new superblock");
1795 if (ret)
1796 goto err_late;
1797
1798 ret = bch2_fs_freespace_init(c);
1799 bch_err_msg(ca, ret, "initializing free space");
1800 if (ret)
1801 goto err_late;
1802
1803 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1804 __bch2_dev_read_write(c, ca);
1805
1806 ret = bch2_dev_journal_alloc(ca, false);
1807 bch_err_msg(c, ret, "allocating journal");
1808 if (ret)
1809 goto err_late;
1810
1811 up_write(&c->state_lock);
1812 return 0;
1813
1814 err_unlock:
1815 mutex_unlock(&c->sb_lock);
1816 up_write(&c->state_lock);
1817 err:
1818 if (ca)
1819 bch2_dev_free(ca);
1820 bch2_free_super(&sb);
1821 printbuf_exit(&label);
1822 printbuf_exit(&errbuf);
1823 bch_err_fn(c, ret);
1824 return ret;
1825 err_late:
1826 up_write(&c->state_lock);
1827 ca = NULL;
1828 goto err;
1829 }
1830
1831 /* Hot add existing device to running filesystem: */
1832 int bch2_dev_online(struct bch_fs *c, const char *path)
1833 {
1834 struct bch_opts opts = bch2_opts_empty();
1835 struct bch_sb_handle sb = { NULL };
1836 struct bch_dev *ca;
1837 unsigned dev_idx;
1838 int ret;
1839
1840 down_write(&c->state_lock);
1841
1842 ret = bch2_read_super(path, &opts, &sb);
1843 if (ret) {
1844 up_write(&c->state_lock);
1845 return ret;
1846 }
1847
1848 dev_idx = sb.sb->dev_idx;
1849
1850 ret = bch2_dev_in_fs(&c->disk_sb, &sb, &c->opts);
1851 bch_err_msg(c, ret, "bringing %s online", path);
1852 if (ret)
1853 goto err;
1854
1855 ret = bch2_dev_attach_bdev(c, &sb);
1856 if (ret)
1857 goto err;
1858
1859 ca = bch2_dev_locked(c, dev_idx);
1860
1861 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);
1862 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path);
1863 if (ret)
1864 goto err;
1865
1866 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1867 __bch2_dev_read_write(c, ca);
1868
1869 if (!ca->mi.freespace_initialized) {
1870 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);
1871 bch_err_msg(ca, ret, "initializing free space");
1872 if (ret)
1873 goto err;
1874 }
1875
1876 if (!ca->journal.nr) {
1877 ret = bch2_dev_journal_alloc(ca, false);
1878 bch_err_msg(ca, ret, "allocating journal");
1879 if (ret)
1880 goto err;
1881 }
1882
1883 mutex_lock(&c->sb_lock);
1884 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount =
1885 cpu_to_le64(ktime_get_real_seconds());
1886 bch2_write_super(c);
1887 mutex_unlock(&c->sb_lock);
1888
1889 up_write(&c->state_lock);
1890 return 0;
1891 err:
1892 up_write(&c->state_lock);
1893 bch2_free_super(&sb);
1894 return ret;
1895 }
1896
1897 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1898 {
1899 down_write(&c->state_lock);
1900
1901 if (!bch2_dev_is_online(ca)) {
1902 bch_err(ca, "Already offline");
1903 up_write(&c->state_lock);
1904 return 0;
1905 }
1906
1907 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1908 bch_err(ca, "Cannot offline required disk");
1909 up_write(&c->state_lock);
1910 return -BCH_ERR_device_state_not_allowed;
1911 }
1912
1913 __bch2_dev_offline(c, ca);
1914
1915 up_write(&c->state_lock);
1916 return 0;
1917 }
1918
1919 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1920 {
1921 struct bch_member *m;
1922 u64 old_nbuckets;
1923 int ret = 0;
1924
1925 down_write(&c->state_lock);
1926 old_nbuckets = ca->mi.nbuckets;
1927
1928 if (nbuckets < ca->mi.nbuckets) {
1929 bch_err(ca, "Cannot shrink yet");
1930 ret = -EINVAL;
1931 goto err;
1932 }
1933
1934 if (nbuckets > BCH_MEMBER_NBUCKETS_MAX) {
1935 bch_err(ca, "New device size too big (%llu greater than max %u)",
1936 nbuckets, BCH_MEMBER_NBUCKETS_MAX);
1937 ret = -BCH_ERR_device_size_too_big;
1938 goto err;
1939 }
1940
1941 if (bch2_dev_is_online(ca) &&
1942 get_capacity(ca->disk_sb.bdev->bd_disk) <
1943 ca->mi.bucket_size * nbuckets) {
1944 bch_err(ca, "New size larger than device");
1945 ret = -BCH_ERR_device_size_too_small;
1946 goto err;
1947 }
1948
1949 ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1950 bch_err_msg(ca, ret, "resizing buckets");
1951 if (ret)
1952 goto err;
1953
1954 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);
1955 if (ret)
1956 goto err;
1957
1958 mutex_lock(&c->sb_lock);
1959 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1960 m->nbuckets = cpu_to_le64(nbuckets);
1961
1962 bch2_write_super(c);
1963 mutex_unlock(&c->sb_lock);
1964
1965 if (ca->mi.freespace_initialized) {
1966 struct disk_accounting_pos acc = {
1967 .type = BCH_DISK_ACCOUNTING_dev_data_type,
1968 .dev_data_type.dev = ca->dev_idx,
1969 .dev_data_type.data_type = BCH_DATA_free,
1970 };
1971 u64 v[3] = { nbuckets - old_nbuckets, 0, 0 };
1972
1973 ret = bch2_trans_commit_do(ca->fs, NULL, NULL, 0,
1974 bch2_disk_accounting_mod(trans, &acc, v, ARRAY_SIZE(v), false)) ?:
1975 bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets);
1976 if (ret)
1977 goto err;
1978 }
1979
1980 bch2_recalc_capacity(c);
1981 err:
1982 up_write(&c->state_lock);
1983 return ret;
1984 }
1985
1986 /* return with ref on ca->ref: */
1987 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
1988 {
1989 if (!strncmp(name, "/dev/", strlen("/dev/")))
1990 name += strlen("/dev/");
1991
1992 for_each_member_device(c, ca)
1993 if (!strcmp(name, ca->name))
1994 return ca;
1995 return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found);
1996 }
1997
1998 /* Filesystem open: */
1999
2000 static inline int sb_cmp(struct bch_sb *l, struct bch_sb *r)
2001 {
2002 return cmp_int(le64_to_cpu(l->seq), le64_to_cpu(r->seq)) ?:
2003 cmp_int(le64_to_cpu(l->write_time), le64_to_cpu(r->write_time));
2004 }
2005
2006 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
2007 struct bch_opts opts)
2008 {
2009 DARRAY(struct bch_sb_handle) sbs = { 0 };
2010 struct bch_fs *c = NULL;
2011 struct bch_sb_handle *best = NULL;
2012 struct printbuf errbuf = PRINTBUF;
2013 int ret = 0;
2014
2015 if (!try_module_get(THIS_MODULE))
2016 return ERR_PTR(-ENODEV);
2017
2018 if (!nr_devices) {
2019 ret = -EINVAL;
2020 goto err;
2021 }
2022
2023 ret = darray_make_room(&sbs, nr_devices);
2024 if (ret)
2025 goto err;
2026
2027 for (unsigned i = 0; i < nr_devices; i++) {
2028 struct bch_sb_handle sb = { NULL };
2029
2030 ret = bch2_read_super(devices[i], &opts, &sb);
2031 if (ret)
2032 goto err;
2033
2034 BUG_ON(darray_push(&sbs, sb));
2035 }
2036
2037 if (opts.nochanges && !opts.read_only) {
2038 ret = -BCH_ERR_erofs_nochanges;
2039 goto err_print;
2040 }
2041
2042 darray_for_each(sbs, sb)
2043 if (!best || sb_cmp(sb->sb, best->sb) > 0)
2044 best = sb;
2045
2046 darray_for_each_reverse(sbs, sb) {
2047 ret = bch2_dev_in_fs(best, sb, &opts);
2048
2049 if (ret == -BCH_ERR_device_has_been_removed ||
2050 ret == -BCH_ERR_device_splitbrain) {
2051 bch2_free_super(sb);
2052 darray_remove_item(&sbs, sb);
2053 best -= best > sb;
2054 ret = 0;
2055 continue;
2056 }
2057
2058 if (ret)
2059 goto err_print;
2060 }
2061
2062 c = bch2_fs_alloc(best->sb, opts);
2063 ret = PTR_ERR_OR_ZERO(c);
2064 if (ret)
2065 goto err;
2066
2067 down_write(&c->state_lock);
2068 darray_for_each(sbs, sb) {
2069 ret = bch2_dev_attach_bdev(c, sb);
2070 if (ret) {
2071 up_write(&c->state_lock);
2072 goto err;
2073 }
2074 }
2075 up_write(&c->state_lock);
2076
2077 if (!bch2_fs_may_start(c)) {
2078 ret = -BCH_ERR_insufficient_devices_to_start;
2079 goto err_print;
2080 }
2081
2082 if (!c->opts.nostart) {
2083 ret = bch2_fs_start(c);
2084 if (ret)
2085 goto err;
2086 }
2087 out:
2088 darray_for_each(sbs, sb)
2089 bch2_free_super(sb);
2090 darray_exit(&sbs);
2091 printbuf_exit(&errbuf);
2092 module_put(THIS_MODULE);
2093 return c;
2094 err_print:
2095 pr_err("bch_fs_open err opening %s: %s",
2096 devices[0], bch2_err_str(ret));
2097 err:
2098 if (!IS_ERR_OR_NULL(c))
2099 bch2_fs_stop(c);
2100 c = ERR_PTR(ret);
2101 goto out;
2102 }
2103
2104 /* Global interfaces/init */
2105
2106 static void bcachefs_exit(void)
2107 {
2108 bch2_debug_exit();
2109 bch2_vfs_exit();
2110 bch2_chardev_exit();
2111 bch2_btree_key_cache_exit();
2112 if (bcachefs_kset)
2113 kset_unregister(bcachefs_kset);
2114 }
2115
2116 static int __init bcachefs_init(void)
2117 {
2118 bch2_bkey_pack_test();
2119
2120 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
2121 bch2_btree_key_cache_init() ||
2122 bch2_chardev_init() ||
2123 bch2_vfs_init() ||
2124 bch2_debug_init())
2125 goto err;
2126
2127 return 0;
2128 err:
2129 bcachefs_exit();
2130 return -ENOMEM;
2131 }
2132
2133 #define BCH_DEBUG_PARAM(name, description) \
2134 bool bch2_##name; \
2135 module_param_named(name, bch2_##name, bool, 0644); \
2136 MODULE_PARM_DESC(name, description);
2137 BCH_DEBUG_PARAMS()
2138 #undef BCH_DEBUG_PARAM
2139
2140 __maybe_unused
2141 static unsigned bch2_metadata_version = bcachefs_metadata_version_current;
2142 module_param_named(version, bch2_metadata_version, uint, 0400);
2143
2144 module_exit(bcachefs_exit);
2145 module_init(bcachefs_init);
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