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_free(struct bch_dev *);
188 static int bch2_dev_alloc(struct bch_fs *, unsigned);
189 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
190 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
191
192 struct bch_fs *bch2_dev_to_fs(dev_t dev)
193 {
194 struct bch_fs *c;
195
196 mutex_lock(&bch_fs_list_lock);
197 rcu_read_lock();
198
199 list_for_each_entry(c, &bch_fs_list, list)
200 for_each_member_device_rcu(c, ca, NULL)
201 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
202 closure_get(&c->cl);
203 goto found;
204 }
205 c = NULL;
206 found:
207 rcu_read_unlock();
208 mutex_unlock(&bch_fs_list_lock);
209
210 return c;
211 }
212
213 static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)
214 {
215 struct bch_fs *c;
216
217 lockdep_assert_held(&bch_fs_list_lock);
218
219 list_for_each_entry(c, &bch_fs_list, list)
220 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))
221 return c;
222
223 return NULL;
224 }
225
226 struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)
227 {
228 struct bch_fs *c;
229
230 mutex_lock(&bch_fs_list_lock);
231 c = __bch2_uuid_to_fs(uuid);
232 if (c)
233 closure_get(&c->cl);
234 mutex_unlock(&bch_fs_list_lock);
235
236 return c;
237 }
238
239 /* Filesystem RO/RW: */
240
241 /*
242 * For startup/shutdown of RW stuff, the dependencies are:
243 *
244 * - foreground writes depend on copygc and rebalance (to free up space)
245 *
246 * - copygc and rebalance depend on mark and sweep gc (they actually probably
247 * don't because they either reserve ahead of time or don't block if
248 * allocations fail, but allocations can require mark and sweep gc to run
249 * because of generation number wraparound)
250 *
251 * - all of the above depends on the allocator threads
252 *
253 * - allocator depends on the journal (when it rewrites prios and gens)
254 */
255
256 static void __bch2_fs_read_only(struct bch_fs *c)
257 {
258 unsigned clean_passes = 0;
259 u64 seq = 0;
260
261 bch2_fs_ec_stop(c);
262 bch2_open_buckets_stop(c, NULL, true);
263 bch2_rebalance_stop(c);
264 bch2_copygc_stop(c);
265 bch2_fs_ec_flush(c);
266
267 bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",
268 journal_cur_seq(&c->journal));
269
270 do {
271 clean_passes++;
272
273 if (bch2_btree_interior_updates_flush(c) ||
274 bch2_journal_flush_all_pins(&c->journal) ||
275 bch2_btree_flush_all_writes(c) ||
276 seq != atomic64_read(&c->journal.seq)) {
277 seq = atomic64_read(&c->journal.seq);
278 clean_passes = 0;
279 }
280 } while (clean_passes < 2);
281
282 bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu",
283 journal_cur_seq(&c->journal));
284
285 if (test_bit(JOURNAL_replay_done, &c->journal.flags) &&
286 !test_bit(BCH_FS_emergency_ro, &c->flags))
287 set_bit(BCH_FS_clean_shutdown, &c->flags);
288
289 bch2_fs_journal_stop(&c->journal);
290
291 bch_info(c, "%sshutdown complete, journal seq %llu",
292 test_bit(BCH_FS_clean_shutdown, &c->flags) ? "" : "un",
293 c->journal.seq_ondisk);
294
295 /*
296 * After stopping journal:
297 */
298 for_each_member_device(c, ca)
299 bch2_dev_allocator_remove(c, ca);
300 }
301
302 #ifndef BCH_WRITE_REF_DEBUG
303 static void bch2_writes_disabled(struct percpu_ref *writes)
304 {
305 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
306
307 set_bit(BCH_FS_write_disable_complete, &c->flags);
308 wake_up(&bch2_read_only_wait);
309 }
310 #endif
311
312 void bch2_fs_read_only(struct bch_fs *c)
313 {
314 if (!test_bit(BCH_FS_rw, &c->flags)) {
315 bch2_journal_reclaim_stop(&c->journal);
316 return;
317 }
318
319 BUG_ON(test_bit(BCH_FS_write_disable_complete, &c->flags));
320
321 bch_verbose(c, "going read-only");
322
323 /*
324 * Block new foreground-end write operations from starting - any new
325 * writes will return -EROFS:
326 */
327 set_bit(BCH_FS_going_ro, &c->flags);
328 #ifndef BCH_WRITE_REF_DEBUG
329 percpu_ref_kill(&c->writes);
330 #else
331 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
332 bch2_write_ref_put(c, i);
333 #endif
334
335 /*
336 * If we're not doing an emergency shutdown, we want to wait on
337 * outstanding writes to complete so they don't see spurious errors due
338 * to shutting down the allocator:
339 *
340 * If we are doing an emergency shutdown outstanding writes may
341 * hang until we shutdown the allocator so we don't want to wait
342 * on outstanding writes before shutting everything down - but
343 * we do need to wait on them before returning and signalling
344 * that going RO is complete:
345 */
346 wait_event(bch2_read_only_wait,
347 test_bit(BCH_FS_write_disable_complete, &c->flags) ||
348 test_bit(BCH_FS_emergency_ro, &c->flags));
349
350 bool writes_disabled = test_bit(BCH_FS_write_disable_complete, &c->flags);
351 if (writes_disabled)
352 bch_verbose(c, "finished waiting for writes to stop");
353
354 __bch2_fs_read_only(c);
355
356 wait_event(bch2_read_only_wait,
357 test_bit(BCH_FS_write_disable_complete, &c->flags));
358
359 if (!writes_disabled)
360 bch_verbose(c, "finished waiting for writes to stop");
361
362 clear_bit(BCH_FS_write_disable_complete, &c->flags);
363 clear_bit(BCH_FS_going_ro, &c->flags);
364 clear_bit(BCH_FS_rw, &c->flags);
365
366 if (!bch2_journal_error(&c->journal) &&
367 !test_bit(BCH_FS_error, &c->flags) &&
368 !test_bit(BCH_FS_emergency_ro, &c->flags) &&
369 test_bit(BCH_FS_started, &c->flags) &&
370 test_bit(BCH_FS_clean_shutdown, &c->flags) &&
371 c->recovery_pass_done >= BCH_RECOVERY_PASS_journal_replay) {
372 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal));
373 BUG_ON(atomic_read(&c->btree_cache.dirty));
374 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty));
375 BUG_ON(c->btree_write_buffer.inc.keys.nr);
376 BUG_ON(c->btree_write_buffer.flushing.keys.nr);
377 bch2_verify_accounting_clean(c);
378
379 bch_verbose(c, "marking filesystem clean");
380 bch2_fs_mark_clean(c);
381 } else {
382 bch_verbose(c, "done going read-only, filesystem not clean");
383 }
384 }
385
386 static void bch2_fs_read_only_work(struct work_struct *work)
387 {
388 struct bch_fs *c =
389 container_of(work, struct bch_fs, read_only_work);
390
391 down_write(&c->state_lock);
392 bch2_fs_read_only(c);
393 up_write(&c->state_lock);
394 }
395
396 static void bch2_fs_read_only_async(struct bch_fs *c)
397 {
398 queue_work(system_long_wq, &c->read_only_work);
399 }
400
401 bool bch2_fs_emergency_read_only(struct bch_fs *c)
402 {
403 bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags);
404
405 bch2_journal_halt(&c->journal);
406 bch2_fs_read_only_async(c);
407
408 wake_up(&bch2_read_only_wait);
409 return ret;
410 }
411
412 static int bch2_fs_read_write_late(struct bch_fs *c)
413 {
414 int ret;
415
416 /*
417 * Data move operations can't run until after check_snapshots has
418 * completed, and bch2_snapshot_is_ancestor() is available.
419 *
420 * Ideally we'd start copygc/rebalance earlier instead of waiting for
421 * all of recovery/fsck to complete:
422 */
423 ret = bch2_copygc_start(c);
424 if (ret) {
425 bch_err(c, "error starting copygc thread");
426 return ret;
427 }
428
429 ret = bch2_rebalance_start(c);
430 if (ret) {
431 bch_err(c, "error starting rebalance thread");
432 return ret;
433 }
434
435 return 0;
436 }
437
438 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
439 {
440 int ret;
441
442 if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) {
443 bch_err(c, "cannot go rw, unfixed btree errors");
444 return -BCH_ERR_erofs_unfixed_errors;
445 }
446
447 if (test_bit(BCH_FS_rw, &c->flags))
448 return 0;
449
450 bch_info(c, "going read-write");
451
452 ret = bch2_sb_members_v2_init(c);
453 if (ret)
454 goto err;
455
456 ret = bch2_fs_mark_dirty(c);
457 if (ret)
458 goto err;
459
460 clear_bit(BCH_FS_clean_shutdown, &c->flags);
461
462 /*
463 * First journal write must be a flush write: after a clean shutdown we
464 * don't read the journal, so the first journal write may end up
465 * overwriting whatever was there previously, and there must always be
466 * at least one non-flush write in the journal or recovery will fail:
467 */
468 set_bit(JOURNAL_need_flush_write, &c->journal.flags);
469 set_bit(JOURNAL_running, &c->journal.flags);
470
471 for_each_rw_member(c, ca)
472 bch2_dev_allocator_add(c, ca);
473 bch2_recalc_capacity(c);
474
475 set_bit(BCH_FS_rw, &c->flags);
476 set_bit(BCH_FS_was_rw, &c->flags);
477
478 #ifndef BCH_WRITE_REF_DEBUG
479 percpu_ref_reinit(&c->writes);
480 #else
481 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) {
482 BUG_ON(atomic_long_read(&c->writes[i]));
483 atomic_long_inc(&c->writes[i]);
484 }
485 #endif
486
487 ret = bch2_journal_reclaim_start(&c->journal);
488 if (ret)
489 goto err;
490
491 if (!early) {
492 ret = bch2_fs_read_write_late(c);
493 if (ret)
494 goto err;
495 }
496
497 bch2_do_discards(c);
498 bch2_do_invalidates(c);
499 bch2_do_stripe_deletes(c);
500 bch2_do_pending_node_rewrites(c);
501 return 0;
502 err:
503 if (test_bit(BCH_FS_rw, &c->flags))
504 bch2_fs_read_only(c);
505 else
506 __bch2_fs_read_only(c);
507 return ret;
508 }
509
510 int bch2_fs_read_write(struct bch_fs *c)
511 {
512 if (c->opts.recovery_pass_last &&
513 c->opts.recovery_pass_last < BCH_RECOVERY_PASS_journal_replay)
514 return -BCH_ERR_erofs_norecovery;
515
516 if (c->opts.nochanges)
517 return -BCH_ERR_erofs_nochanges;
518
519 return __bch2_fs_read_write(c, false);
520 }
521
522 int bch2_fs_read_write_early(struct bch_fs *c)
523 {
524 lockdep_assert_held(&c->state_lock);
525
526 return __bch2_fs_read_write(c, true);
527 }
528
529 /* Filesystem startup/shutdown: */
530
531 static void __bch2_fs_free(struct bch_fs *c)
532 {
533 for (unsigned i = 0; i < BCH_TIME_STAT_NR; i++)
534 bch2_time_stats_exit(&c->times[i]);
535
536 bch2_find_btree_nodes_exit(&c->found_btree_nodes);
537 bch2_free_pending_node_rewrites(c);
538 bch2_fs_accounting_exit(c);
539 bch2_fs_sb_errors_exit(c);
540 bch2_fs_counters_exit(c);
541 bch2_fs_snapshots_exit(c);
542 bch2_fs_quota_exit(c);
543 bch2_fs_fs_io_direct_exit(c);
544 bch2_fs_fs_io_buffered_exit(c);
545 bch2_fs_fsio_exit(c);
546 bch2_fs_ec_exit(c);
547 bch2_fs_encryption_exit(c);
548 bch2_fs_nocow_locking_exit(c);
549 bch2_fs_io_write_exit(c);
550 bch2_fs_io_read_exit(c);
551 bch2_fs_buckets_waiting_for_journal_exit(c);
552 bch2_fs_btree_interior_update_exit(c);
553 bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
554 bch2_fs_btree_cache_exit(c);
555 bch2_fs_btree_iter_exit(c);
556 bch2_fs_replicas_exit(c);
557 bch2_fs_journal_exit(&c->journal);
558 bch2_io_clock_exit(&c->io_clock[WRITE]);
559 bch2_io_clock_exit(&c->io_clock[READ]);
560 bch2_fs_compress_exit(c);
561 bch2_journal_keys_put_initial(c);
562 bch2_find_btree_nodes_exit(&c->found_btree_nodes);
563 BUG_ON(atomic_read(&c->journal_keys.ref));
564 bch2_fs_btree_write_buffer_exit(c);
565 percpu_free_rwsem(&c->mark_lock);
566 if (c->online_reserved) {
567 u64 v = percpu_u64_get(c->online_reserved);
568 WARN(v, "online_reserved not 0 at shutdown: %lli", v);
569 free_percpu(c->online_reserved);
570 }
571
572 darray_exit(&c->btree_roots_extra);
573 free_percpu(c->pcpu);
574 free_percpu(c->usage);
575 mempool_exit(&c->large_bkey_pool);
576 mempool_exit(&c->btree_bounce_pool);
577 bioset_exit(&c->btree_bio);
578 mempool_exit(&c->fill_iter);
579 #ifndef BCH_WRITE_REF_DEBUG
580 percpu_ref_exit(&c->writes);
581 #endif
582 kfree(rcu_dereference_protected(c->disk_groups, 1));
583 kfree(c->journal_seq_blacklist_table);
584 kfree(c->unused_inode_hints);
585
586 if (c->write_ref_wq)
587 destroy_workqueue(c->write_ref_wq);
588 if (c->btree_write_submit_wq)
589 destroy_workqueue(c->btree_write_submit_wq);
590 if (c->btree_read_complete_wq)
591 destroy_workqueue(c->btree_read_complete_wq);
592 if (c->copygc_wq)
593 destroy_workqueue(c->copygc_wq);
594 if (c->btree_io_complete_wq)
595 destroy_workqueue(c->btree_io_complete_wq);
596 if (c->btree_update_wq)
597 destroy_workqueue(c->btree_update_wq);
598
599 bch2_free_super(&c->disk_sb);
600 kvfree(c);
601 module_put(THIS_MODULE);
602 }
603
604 static void bch2_fs_release(struct kobject *kobj)
605 {
606 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
607
608 __bch2_fs_free(c);
609 }
610
611 void __bch2_fs_stop(struct bch_fs *c)
612 {
613 bch_verbose(c, "shutting down");
614
615 set_bit(BCH_FS_stopping, &c->flags);
616
617 down_write(&c->state_lock);
618 bch2_fs_read_only(c);
619 up_write(&c->state_lock);
620
621 for_each_member_device(c, ca)
622 if (ca->kobj.state_in_sysfs &&
623 ca->disk_sb.bdev)
624 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
625
626 if (c->kobj.state_in_sysfs)
627 kobject_del(&c->kobj);
628
629 bch2_fs_debug_exit(c);
630 bch2_fs_chardev_exit(c);
631
632 bch2_ro_ref_put(c);
633 wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref));
634
635 kobject_put(&c->counters_kobj);
636 kobject_put(&c->time_stats);
637 kobject_put(&c->opts_dir);
638 kobject_put(&c->internal);
639
640 /* btree prefetch might have kicked off reads in the background: */
641 bch2_btree_flush_all_reads(c);
642
643 for_each_member_device(c, ca)
644 cancel_work_sync(&ca->io_error_work);
645
646 cancel_work_sync(&c->read_only_work);
647 }
648
649 void bch2_fs_free(struct bch_fs *c)
650 {
651 unsigned i;
652
653 mutex_lock(&bch_fs_list_lock);
654 list_del(&c->list);
655 mutex_unlock(&bch_fs_list_lock);
656
657 closure_sync(&c->cl);
658 closure_debug_destroy(&c->cl);
659
660 for (i = 0; i < c->sb.nr_devices; i++) {
661 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true);
662
663 if (ca) {
664 EBUG_ON(atomic_long_read(&ca->ref) != 1);
665 bch2_free_super(&ca->disk_sb);
666 bch2_dev_free(ca);
667 }
668 }
669
670 bch_verbose(c, "shutdown complete");
671
672 kobject_put(&c->kobj);
673 }
674
675 void bch2_fs_stop(struct bch_fs *c)
676 {
677 __bch2_fs_stop(c);
678 bch2_fs_free(c);
679 }
680
681 static int bch2_fs_online(struct bch_fs *c)
682 {
683 int ret = 0;
684
685 lockdep_assert_held(&bch_fs_list_lock);
686
687 if (__bch2_uuid_to_fs(c->sb.uuid)) {
688 bch_err(c, "filesystem UUID already open");
689 return -EINVAL;
690 }
691
692 ret = bch2_fs_chardev_init(c);
693 if (ret) {
694 bch_err(c, "error creating character device");
695 return ret;
696 }
697
698 bch2_fs_debug_init(c);
699
700 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
701 kobject_add(&c->internal, &c->kobj, "internal") ?:
702 kobject_add(&c->opts_dir, &c->kobj, "options") ?:
703 #ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
704 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
705 #endif
706 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
707 bch2_opts_create_sysfs_files(&c->opts_dir);
708 if (ret) {
709 bch_err(c, "error creating sysfs objects");
710 return ret;
711 }
712
713 down_write(&c->state_lock);
714
715 for_each_member_device(c, ca) {
716 ret = bch2_dev_sysfs_online(c, ca);
717 if (ret) {
718 bch_err(c, "error creating sysfs objects");
719 bch2_dev_put(ca);
720 goto err;
721 }
722 }
723
724 BUG_ON(!list_empty(&c->list));
725 list_add(&c->list, &bch_fs_list);
726 err:
727 up_write(&c->state_lock);
728 return ret;
729 }
730
731 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
732 {
733 struct bch_fs *c;
734 struct printbuf name = PRINTBUF;
735 unsigned i, iter_size;
736 int ret = 0;
737
738 c = kvmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
739 if (!c) {
740 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc);
741 goto out;
742 }
743
744 c->stdio = (void *)(unsigned long) opts.stdio;
745
746 __module_get(THIS_MODULE);
747
748 closure_init(&c->cl, NULL);
749
750 c->kobj.kset = bcachefs_kset;
751 kobject_init(&c->kobj, &bch2_fs_ktype);
752 kobject_init(&c->internal, &bch2_fs_internal_ktype);
753 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
754 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
755 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
756
757 c->minor = -1;
758 c->disk_sb.fs_sb = true;
759
760 init_rwsem(&c->state_lock);
761 mutex_init(&c->sb_lock);
762 mutex_init(&c->replicas_gc_lock);
763 mutex_init(&c->btree_root_lock);
764 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
765
766 refcount_set(&c->ro_ref, 1);
767 init_waitqueue_head(&c->ro_ref_wait);
768 sema_init(&c->online_fsck_mutex, 1);
769
770 init_rwsem(&c->gc_lock);
771 mutex_init(&c->gc_gens_lock);
772 atomic_set(&c->journal_keys.ref, 1);
773 c->journal_keys.initial_ref_held = true;
774
775 for (i = 0; i < BCH_TIME_STAT_NR; i++)
776 bch2_time_stats_init(&c->times[i]);
777
778 bch2_fs_gc_init(c);
779 bch2_fs_copygc_init(c);
780 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
781 bch2_fs_btree_iter_init_early(c);
782 bch2_fs_btree_interior_update_init_early(c);
783 bch2_fs_allocator_background_init(c);
784 bch2_fs_allocator_foreground_init(c);
785 bch2_fs_rebalance_init(c);
786 bch2_fs_quota_init(c);
787 bch2_fs_ec_init_early(c);
788 bch2_fs_move_init(c);
789 bch2_fs_sb_errors_init_early(c);
790
791 INIT_LIST_HEAD(&c->list);
792
793 mutex_init(&c->bio_bounce_pages_lock);
794 mutex_init(&c->snapshot_table_lock);
795 init_rwsem(&c->snapshot_create_lock);
796
797 spin_lock_init(&c->btree_write_error_lock);
798
799 INIT_LIST_HEAD(&c->journal_iters);
800
801 INIT_LIST_HEAD(&c->fsck_error_msgs);
802 mutex_init(&c->fsck_error_msgs_lock);
803
804 seqcount_init(&c->usage_lock);
805
806 sema_init(&c->io_in_flight, 128);
807
808 INIT_LIST_HEAD(&c->vfs_inodes_list);
809 mutex_init(&c->vfs_inodes_lock);
810
811 c->copy_gc_enabled = 1;
812 c->rebalance.enabled = 1;
813 c->promote_whole_extents = true;
814
815 c->journal.flush_write_time = &c->times[BCH_TIME_journal_flush_write];
816 c->journal.noflush_write_time = &c->times[BCH_TIME_journal_noflush_write];
817 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
818
819 bch2_fs_btree_cache_init_early(&c->btree_cache);
820
821 mutex_init(&c->sectors_available_lock);
822
823 ret = percpu_init_rwsem(&c->mark_lock);
824 if (ret)
825 goto err;
826
827 mutex_lock(&c->sb_lock);
828 ret = bch2_sb_to_fs(c, sb);
829 mutex_unlock(&c->sb_lock);
830
831 if (ret)
832 goto err;
833
834 pr_uuid(&name, c->sb.user_uuid.b);
835 ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0;
836 if (ret)
837 goto err;
838
839 strscpy(c->name, name.buf, sizeof(c->name));
840 printbuf_exit(&name);
841
842 /* Compat: */
843 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
844 !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
845 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
846
847 if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
848 !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
849 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
850
851 c->opts = bch2_opts_default;
852 ret = bch2_opts_from_sb(&c->opts, sb);
853 if (ret)
854 goto err;
855
856 bch2_opts_apply(&c->opts, opts);
857
858 c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
859 if (c->opts.inodes_use_key_cache)
860 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
861 c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops;
862
863 c->block_bits = ilog2(block_sectors(c));
864 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
865
866 if (bch2_fs_init_fault("fs_alloc")) {
867 bch_err(c, "fs_alloc fault injected");
868 ret = -EFAULT;
869 goto err;
870 }
871
872 iter_size = sizeof(struct sort_iter) +
873 (btree_blocks(c) + 1) * 2 *
874 sizeof(struct sort_iter_set);
875
876 c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
877
878 if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
879 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_UNBOUND, 512)) ||
880 !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
881 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
882 !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
883 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
884 !(c->btree_read_complete_wq = alloc_workqueue("bcachefs_btree_read_complete",
885 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 512)) ||
886 !(c->btree_write_submit_wq = alloc_workqueue("bcachefs_btree_write_sumit",
887 WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
888 !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref",
889 WQ_FREEZABLE, 0)) ||
890 #ifndef BCH_WRITE_REF_DEBUG
891 percpu_ref_init(&c->writes, bch2_writes_disabled,
892 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
893 #endif
894 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
895 bioset_init(&c->btree_bio, 1,
896 max(offsetof(struct btree_read_bio, bio),
897 offsetof(struct btree_write_bio, wbio.bio)),
898 BIOSET_NEED_BVECS) ||
899 !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
900 !(c->usage = alloc_percpu(struct bch_fs_usage_base)) ||
901 !(c->online_reserved = alloc_percpu(u64)) ||
902 mempool_init_kvmalloc_pool(&c->btree_bounce_pool, 1,
903 c->opts.btree_node_size) ||
904 mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
905 !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
906 sizeof(u64), GFP_KERNEL))) {
907 ret = -BCH_ERR_ENOMEM_fs_other_alloc;
908 goto err;
909 }
910
911 ret = bch2_fs_counters_init(c) ?:
912 bch2_fs_sb_errors_init(c) ?:
913 bch2_io_clock_init(&c->io_clock[READ]) ?:
914 bch2_io_clock_init(&c->io_clock[WRITE]) ?:
915 bch2_fs_journal_init(&c->journal) ?:
916 bch2_fs_btree_iter_init(c) ?:
917 bch2_fs_btree_cache_init(c) ?:
918 bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
919 bch2_fs_btree_interior_update_init(c) ?:
920 bch2_fs_buckets_waiting_for_journal_init(c) ?:
921 bch2_fs_btree_write_buffer_init(c) ?:
922 bch2_fs_subvolumes_init(c) ?:
923 bch2_fs_io_read_init(c) ?:
924 bch2_fs_io_write_init(c) ?:
925 bch2_fs_nocow_locking_init(c) ?:
926 bch2_fs_encryption_init(c) ?:
927 bch2_fs_compress_init(c) ?:
928 bch2_fs_ec_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 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
1036 ? bch2_fs_recovery(c)
1037 : bch2_fs_initialize(c);
1038 if (ret)
1039 goto err;
1040
1041 ret = bch2_opts_check_may_set(c);
1042 if (ret)
1043 goto err;
1044
1045 if (bch2_fs_init_fault("fs_start")) {
1046 bch_err(c, "fs_start fault injected");
1047 ret = -EINVAL;
1048 goto err;
1049 }
1050
1051 set_bit(BCH_FS_started, &c->flags);
1052
1053 if (c->opts.read_only) {
1054 bch2_fs_read_only(c);
1055 } else {
1056 ret = !test_bit(BCH_FS_rw, &c->flags)
1057 ? bch2_fs_read_write(c)
1058 : bch2_fs_read_write_late(c);
1059 if (ret)
1060 goto err;
1061 }
1062
1063 ret = 0;
1064 err:
1065 if (ret)
1066 bch_err_msg(c, ret, "starting filesystem");
1067 else
1068 bch_verbose(c, "done starting filesystem");
1069 up_write(&c->state_lock);
1070 return ret;
1071 }
1072
1073 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
1074 {
1075 struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx);
1076
1077 if (le16_to_cpu(sb->block_size) != block_sectors(c))
1078 return -BCH_ERR_mismatched_block_size;
1079
1080 if (le16_to_cpu(m.bucket_size) <
1081 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
1082 return -BCH_ERR_bucket_size_too_small;
1083
1084 return 0;
1085 }
1086
1087 static int bch2_dev_in_fs(struct bch_sb_handle *fs,
1088 struct bch_sb_handle *sb,
1089 struct bch_opts *opts)
1090 {
1091 if (fs == sb)
1092 return 0;
1093
1094 if (!uuid_equal(&fs->sb->uuid, &sb->sb->uuid))
1095 return -BCH_ERR_device_not_a_member_of_filesystem;
1096
1097 if (!bch2_member_exists(fs->sb, sb->sb->dev_idx))
1098 return -BCH_ERR_device_has_been_removed;
1099
1100 if (fs->sb->block_size != sb->sb->block_size)
1101 return -BCH_ERR_mismatched_block_size;
1102
1103 if (le16_to_cpu(fs->sb->version) < bcachefs_metadata_version_member_seq ||
1104 le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_member_seq)
1105 return 0;
1106
1107 if (fs->sb->seq == sb->sb->seq &&
1108 fs->sb->write_time != sb->sb->write_time) {
1109 struct printbuf buf = PRINTBUF;
1110
1111 prt_str(&buf, "Split brain detected between ");
1112 prt_bdevname(&buf, sb->bdev);
1113 prt_str(&buf, " and ");
1114 prt_bdevname(&buf, fs->bdev);
1115 prt_char(&buf, ':');
1116 prt_newline(&buf);
1117 prt_printf(&buf, "seq=%llu but write_time different, got", le64_to_cpu(sb->sb->seq));
1118 prt_newline(&buf);
1119
1120 prt_bdevname(&buf, fs->bdev);
1121 prt_char(&buf, ' ');
1122 bch2_prt_datetime(&buf, le64_to_cpu(fs->sb->write_time));;
1123 prt_newline(&buf);
1124
1125 prt_bdevname(&buf, sb->bdev);
1126 prt_char(&buf, ' ');
1127 bch2_prt_datetime(&buf, le64_to_cpu(sb->sb->write_time));;
1128 prt_newline(&buf);
1129
1130 if (!opts->no_splitbrain_check)
1131 prt_printf(&buf, "Not using older sb");
1132
1133 pr_err("%s", buf.buf);
1134 printbuf_exit(&buf);
1135
1136 if (!opts->no_splitbrain_check)
1137 return -BCH_ERR_device_splitbrain;
1138 }
1139
1140 struct bch_member m = bch2_sb_member_get(fs->sb, sb->sb->dev_idx);
1141 u64 seq_from_fs = le64_to_cpu(m.seq);
1142 u64 seq_from_member = le64_to_cpu(sb->sb->seq);
1143
1144 if (seq_from_fs && seq_from_fs < seq_from_member) {
1145 struct printbuf buf = PRINTBUF;
1146
1147 prt_str(&buf, "Split brain detected between ");
1148 prt_bdevname(&buf, sb->bdev);
1149 prt_str(&buf, " and ");
1150 prt_bdevname(&buf, fs->bdev);
1151 prt_char(&buf, ':');
1152 prt_newline(&buf);
1153
1154 prt_bdevname(&buf, fs->bdev);
1155 prt_str(&buf, " believes seq of ");
1156 prt_bdevname(&buf, sb->bdev);
1157 prt_printf(&buf, " to be %llu, but ", seq_from_fs);
1158 prt_bdevname(&buf, sb->bdev);
1159 prt_printf(&buf, " has %llu\n", seq_from_member);
1160
1161 if (!opts->no_splitbrain_check) {
1162 prt_str(&buf, "Not using ");
1163 prt_bdevname(&buf, sb->bdev);
1164 }
1165
1166 pr_err("%s", buf.buf);
1167 printbuf_exit(&buf);
1168
1169 if (!opts->no_splitbrain_check)
1170 return -BCH_ERR_device_splitbrain;
1171 }
1172
1173 return 0;
1174 }
1175
1176 /* Device startup/shutdown: */
1177
1178 static void bch2_dev_release(struct kobject *kobj)
1179 {
1180 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
1181
1182 kfree(ca);
1183 }
1184
1185 static void bch2_dev_free(struct bch_dev *ca)
1186 {
1187 cancel_work_sync(&ca->io_error_work);
1188
1189 if (ca->kobj.state_in_sysfs &&
1190 ca->disk_sb.bdev)
1191 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1192
1193 if (ca->kobj.state_in_sysfs)
1194 kobject_del(&ca->kobj);
1195
1196 bch2_free_super(&ca->disk_sb);
1197 bch2_dev_allocator_background_exit(ca);
1198 bch2_dev_journal_exit(ca);
1199
1200 free_percpu(ca->io_done);
1201 bch2_dev_buckets_free(ca);
1202 free_page((unsigned long) ca->sb_read_scratch);
1203
1204 bch2_time_stats_quantiles_exit(&ca->io_latency[WRITE]);
1205 bch2_time_stats_quantiles_exit(&ca->io_latency[READ]);
1206
1207 percpu_ref_exit(&ca->io_ref);
1208 #ifndef CONFIG_BCACHEFS_DEBUG
1209 percpu_ref_exit(&ca->ref);
1210 #endif
1211 kobject_put(&ca->kobj);
1212 }
1213
1214 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1215 {
1216
1217 lockdep_assert_held(&c->state_lock);
1218
1219 if (percpu_ref_is_zero(&ca->io_ref))
1220 return;
1221
1222 __bch2_dev_read_only(c, ca);
1223
1224 reinit_completion(&ca->io_ref_completion);
1225 percpu_ref_kill(&ca->io_ref);
1226 wait_for_completion(&ca->io_ref_completion);
1227
1228 if (ca->kobj.state_in_sysfs) {
1229 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1230 sysfs_remove_link(&ca->kobj, "block");
1231 }
1232
1233 bch2_free_super(&ca->disk_sb);
1234 bch2_dev_journal_exit(ca);
1235 }
1236
1237 #ifndef CONFIG_BCACHEFS_DEBUG
1238 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1239 {
1240 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1241
1242 complete(&ca->ref_completion);
1243 }
1244 #endif
1245
1246 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1247 {
1248 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1249
1250 complete(&ca->io_ref_completion);
1251 }
1252
1253 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1254 {
1255 int ret;
1256
1257 if (!c->kobj.state_in_sysfs)
1258 return 0;
1259
1260 if (!ca->kobj.state_in_sysfs) {
1261 ret = kobject_add(&ca->kobj, &c->kobj,
1262 "dev-%u", ca->dev_idx);
1263 if (ret)
1264 return ret;
1265 }
1266
1267 if (ca->disk_sb.bdev) {
1268 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1269
1270 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1271 if (ret)
1272 return ret;
1273
1274 ret = sysfs_create_link(&ca->kobj, block, "block");
1275 if (ret)
1276 return ret;
1277 }
1278
1279 return 0;
1280 }
1281
1282 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1283 struct bch_member *member)
1284 {
1285 struct bch_dev *ca;
1286 unsigned i;
1287
1288 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1289 if (!ca)
1290 return NULL;
1291
1292 kobject_init(&ca->kobj, &bch2_dev_ktype);
1293 init_completion(&ca->ref_completion);
1294 init_completion(&ca->io_ref_completion);
1295
1296 init_rwsem(&ca->bucket_lock);
1297
1298 INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1299
1300 bch2_time_stats_quantiles_init(&ca->io_latency[READ]);
1301 bch2_time_stats_quantiles_init(&ca->io_latency[WRITE]);
1302
1303 ca->mi = bch2_mi_to_cpu(member);
1304
1305 for (i = 0; i < ARRAY_SIZE(member->errors); i++)
1306 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i]));
1307
1308 ca->uuid = member->uuid;
1309
1310 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
1311 ca->mi.bucket_size / btree_sectors(c));
1312
1313 #ifndef CONFIG_BCACHEFS_DEBUG
1314 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, 0, GFP_KERNEL))
1315 goto err;
1316 #else
1317 atomic_long_set(&ca->ref, 1);
1318 #endif
1319
1320 bch2_dev_allocator_background_init(ca);
1321
1322 if (percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1323 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1324 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
1325 bch2_dev_buckets_alloc(c, ca) ||
1326 !(ca->io_done = alloc_percpu(*ca->io_done)))
1327 goto err;
1328
1329 return ca;
1330 err:
1331 bch2_dev_free(ca);
1332 return NULL;
1333 }
1334
1335 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1336 unsigned dev_idx)
1337 {
1338 ca->dev_idx = dev_idx;
1339 __set_bit(ca->dev_idx, ca->self.d);
1340 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1341
1342 ca->fs = c;
1343 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1344
1345 if (bch2_dev_sysfs_online(c, ca))
1346 pr_warn("error creating sysfs objects");
1347 }
1348
1349 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1350 {
1351 struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx);
1352 struct bch_dev *ca = NULL;
1353 int ret = 0;
1354
1355 if (bch2_fs_init_fault("dev_alloc"))
1356 goto err;
1357
1358 ca = __bch2_dev_alloc(c, &member);
1359 if (!ca)
1360 goto err;
1361
1362 ca->fs = c;
1363
1364 bch2_dev_attach(c, ca, dev_idx);
1365 return ret;
1366 err:
1367 if (ca)
1368 bch2_dev_free(ca);
1369 return -BCH_ERR_ENOMEM_dev_alloc;
1370 }
1371
1372 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1373 {
1374 unsigned ret;
1375
1376 if (bch2_dev_is_online(ca)) {
1377 bch_err(ca, "already have device online in slot %u",
1378 sb->sb->dev_idx);
1379 return -BCH_ERR_device_already_online;
1380 }
1381
1382 if (get_capacity(sb->bdev->bd_disk) <
1383 ca->mi.bucket_size * ca->mi.nbuckets) {
1384 bch_err(ca, "cannot online: device too small");
1385 return -BCH_ERR_device_size_too_small;
1386 }
1387
1388 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1389
1390 ret = bch2_dev_journal_init(ca, sb->sb);
1391 if (ret)
1392 return ret;
1393
1394 /* Commit: */
1395 ca->disk_sb = *sb;
1396 memset(sb, 0, sizeof(*sb));
1397
1398 ca->dev = ca->disk_sb.bdev->bd_dev;
1399
1400 percpu_ref_reinit(&ca->io_ref);
1401
1402 return 0;
1403 }
1404
1405 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1406 {
1407 struct bch_dev *ca;
1408 int ret;
1409
1410 lockdep_assert_held(&c->state_lock);
1411
1412 if (le64_to_cpu(sb->sb->seq) >
1413 le64_to_cpu(c->disk_sb.sb->seq))
1414 bch2_sb_to_fs(c, sb->sb);
1415
1416 BUG_ON(!bch2_dev_exists(c, sb->sb->dev_idx));
1417
1418 ca = bch2_dev_locked(c, sb->sb->dev_idx);
1419
1420 ret = __bch2_dev_attach_bdev(ca, sb);
1421 if (ret)
1422 return ret;
1423
1424 bch2_dev_sysfs_online(c, ca);
1425
1426 struct printbuf name = PRINTBUF;
1427 prt_bdevname(&name, ca->disk_sb.bdev);
1428
1429 if (c->sb.nr_devices == 1)
1430 strscpy(c->name, name.buf, sizeof(c->name));
1431 strscpy(ca->name, name.buf, sizeof(ca->name));
1432
1433 printbuf_exit(&name);
1434
1435 rebalance_wakeup(c);
1436 return 0;
1437 }
1438
1439 /* Device management: */
1440
1441 /*
1442 * Note: this function is also used by the error paths - when a particular
1443 * device sees an error, we call it to determine whether we can just set the
1444 * device RO, or - if this function returns false - we'll set the whole
1445 * filesystem RO:
1446 *
1447 * XXX: maybe we should be more explicit about whether we're changing state
1448 * because we got an error or what have you?
1449 */
1450 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1451 enum bch_member_state new_state, int flags)
1452 {
1453 struct bch_devs_mask new_online_devs;
1454 int nr_rw = 0, required;
1455
1456 lockdep_assert_held(&c->state_lock);
1457
1458 switch (new_state) {
1459 case BCH_MEMBER_STATE_rw:
1460 return true;
1461 case BCH_MEMBER_STATE_ro:
1462 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1463 return true;
1464
1465 /* do we have enough devices to write to? */
1466 for_each_member_device(c, ca2)
1467 if (ca2 != ca)
1468 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1469
1470 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1471 ? c->opts.metadata_replicas
1472 : metadata_replicas_required(c),
1473 !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1474 ? c->opts.data_replicas
1475 : data_replicas_required(c));
1476
1477 return nr_rw >= required;
1478 case BCH_MEMBER_STATE_failed:
1479 case BCH_MEMBER_STATE_spare:
1480 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1481 ca->mi.state != BCH_MEMBER_STATE_ro)
1482 return true;
1483
1484 /* do we have enough devices to read from? */
1485 new_online_devs = bch2_online_devs(c);
1486 __clear_bit(ca->dev_idx, new_online_devs.d);
1487
1488 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1489 default:
1490 BUG();
1491 }
1492 }
1493
1494 static bool bch2_fs_may_start(struct bch_fs *c)
1495 {
1496 struct bch_dev *ca;
1497 unsigned i, flags = 0;
1498
1499 if (c->opts.very_degraded)
1500 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1501
1502 if (c->opts.degraded)
1503 flags |= BCH_FORCE_IF_DEGRADED;
1504
1505 if (!c->opts.degraded &&
1506 !c->opts.very_degraded) {
1507 mutex_lock(&c->sb_lock);
1508
1509 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1510 if (!bch2_member_exists(c->disk_sb.sb, i))
1511 continue;
1512
1513 ca = bch2_dev_locked(c, i);
1514
1515 if (!bch2_dev_is_online(ca) &&
1516 (ca->mi.state == BCH_MEMBER_STATE_rw ||
1517 ca->mi.state == BCH_MEMBER_STATE_ro)) {
1518 mutex_unlock(&c->sb_lock);
1519 return false;
1520 }
1521 }
1522 mutex_unlock(&c->sb_lock);
1523 }
1524
1525 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1526 }
1527
1528 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1529 {
1530 /*
1531 * The allocator thread itself allocates btree nodes, so stop it first:
1532 */
1533 bch2_dev_allocator_remove(c, ca);
1534 bch2_recalc_capacity(c);
1535 bch2_dev_journal_stop(&c->journal, ca);
1536 }
1537
1538 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1539 {
1540 lockdep_assert_held(&c->state_lock);
1541
1542 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1543
1544 bch2_dev_allocator_add(c, ca);
1545 bch2_recalc_capacity(c);
1546 bch2_dev_do_discards(ca);
1547 }
1548
1549 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1550 enum bch_member_state new_state, int flags)
1551 {
1552 struct bch_member *m;
1553 int ret = 0;
1554
1555 if (ca->mi.state == new_state)
1556 return 0;
1557
1558 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1559 return -BCH_ERR_device_state_not_allowed;
1560
1561 if (new_state != BCH_MEMBER_STATE_rw)
1562 __bch2_dev_read_only(c, ca);
1563
1564 bch_notice(ca, "%s", bch2_member_states[new_state]);
1565
1566 mutex_lock(&c->sb_lock);
1567 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
1568 SET_BCH_MEMBER_STATE(m, new_state);
1569 bch2_write_super(c);
1570 mutex_unlock(&c->sb_lock);
1571
1572 if (new_state == BCH_MEMBER_STATE_rw)
1573 __bch2_dev_read_write(c, ca);
1574
1575 rebalance_wakeup(c);
1576
1577 return ret;
1578 }
1579
1580 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1581 enum bch_member_state new_state, int flags)
1582 {
1583 int ret;
1584
1585 down_write(&c->state_lock);
1586 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1587 up_write(&c->state_lock);
1588
1589 return ret;
1590 }
1591
1592 /* Device add/removal: */
1593
1594 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
1595 {
1596 struct bpos start = POS(ca->dev_idx, 0);
1597 struct bpos end = POS(ca->dev_idx, U64_MAX);
1598 int ret;
1599
1600 /*
1601 * We clear the LRU and need_discard btrees first so that we don't race
1602 * with bch2_do_invalidates() and bch2_do_discards()
1603 */
1604 ret = bch2_btree_delete_range(c, BTREE_ID_lru, start, end,
1605 BTREE_TRIGGER_norun, NULL) ?:
1606 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end,
1607 BTREE_TRIGGER_norun, NULL) ?:
1608 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end,
1609 BTREE_TRIGGER_norun, NULL) ?:
1610 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end,
1611 BTREE_TRIGGER_norun, NULL) ?:
1612 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end,
1613 BTREE_TRIGGER_norun, NULL) ?:
1614 bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end,
1615 BTREE_TRIGGER_norun, NULL) ?:
1616 bch2_dev_usage_remove(c, ca->dev_idx);
1617 bch_err_msg(c, ret, "removing dev alloc info");
1618 return ret;
1619 }
1620
1621 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1622 {
1623 struct bch_member *m;
1624 unsigned dev_idx = ca->dev_idx, data;
1625 int ret;
1626
1627 down_write(&c->state_lock);
1628
1629 /*
1630 * We consume a reference to ca->ref, regardless of whether we succeed
1631 * or fail:
1632 */
1633 bch2_dev_put(ca);
1634
1635 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1636 bch_err(ca, "Cannot remove without losing data");
1637 ret = -BCH_ERR_device_state_not_allowed;
1638 goto err;
1639 }
1640
1641 __bch2_dev_read_only(c, ca);
1642
1643 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1644 bch_err_msg(ca, ret, "bch2_dev_data_drop()");
1645 if (ret)
1646 goto err;
1647
1648 ret = bch2_dev_remove_alloc(c, ca);
1649 bch_err_msg(ca, ret, "bch2_dev_remove_alloc()");
1650 if (ret)
1651 goto err;
1652
1653 /*
1654 * We need to flush the entire journal to get rid of keys that reference
1655 * the device being removed before removing the superblock entry
1656 */
1657 bch2_journal_flush_all_pins(&c->journal);
1658
1659 /*
1660 * this is really just needed for the bch2_replicas_gc_(start|end)
1661 * calls, and could be cleaned up:
1662 */
1663 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1664 bch_err_msg(ca, ret, "bch2_journal_flush_device_pins()");
1665 if (ret)
1666 goto err;
1667
1668 ret = bch2_journal_flush(&c->journal);
1669 bch_err_msg(ca, ret, "bch2_journal_flush()");
1670 if (ret)
1671 goto err;
1672
1673 ret = bch2_replicas_gc2(c);
1674 bch_err_msg(ca, ret, "bch2_replicas_gc2()");
1675 if (ret)
1676 goto err;
1677
1678 data = bch2_dev_has_data(c, ca);
1679 if (data) {
1680 struct printbuf data_has = PRINTBUF;
1681
1682 prt_bitflags(&data_has, __bch2_data_types, data);
1683 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
1684 printbuf_exit(&data_has);
1685 ret = -EBUSY;
1686 goto err;
1687 }
1688
1689 __bch2_dev_offline(c, ca);
1690
1691 mutex_lock(&c->sb_lock);
1692 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1693 mutex_unlock(&c->sb_lock);
1694
1695 #ifndef CONFIG_BCACHEFS_DEBUG
1696 percpu_ref_kill(&ca->ref);
1697 #else
1698 ca->dying = true;
1699 bch2_dev_put(ca);
1700 #endif
1701 wait_for_completion(&ca->ref_completion);
1702
1703 bch2_dev_free(ca);
1704
1705 /*
1706 * Free this device's slot in the bch_member array - all pointers to
1707 * this device must be gone:
1708 */
1709 mutex_lock(&c->sb_lock);
1710 m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1711 memset(&m->uuid, 0, sizeof(m->uuid));
1712
1713 bch2_write_super(c);
1714
1715 mutex_unlock(&c->sb_lock);
1716 up_write(&c->state_lock);
1717 return 0;
1718 err:
1719 if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1720 !percpu_ref_is_zero(&ca->io_ref))
1721 __bch2_dev_read_write(c, ca);
1722 up_write(&c->state_lock);
1723 return ret;
1724 }
1725
1726 /* Add new device to running filesystem: */
1727 int bch2_dev_add(struct bch_fs *c, const char *path)
1728 {
1729 struct bch_opts opts = bch2_opts_empty();
1730 struct bch_sb_handle sb;
1731 struct bch_dev *ca = NULL;
1732 struct bch_sb_field_members_v2 *mi;
1733 struct bch_member dev_mi;
1734 unsigned dev_idx, nr_devices, u64s;
1735 struct printbuf errbuf = PRINTBUF;
1736 struct printbuf label = PRINTBUF;
1737 int ret;
1738
1739 ret = bch2_read_super(path, &opts, &sb);
1740 bch_err_msg(c, ret, "reading super");
1741 if (ret)
1742 goto err;
1743
1744 dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx);
1745
1746 if (BCH_MEMBER_GROUP(&dev_mi)) {
1747 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
1748 if (label.allocation_failure) {
1749 ret = -ENOMEM;
1750 goto err;
1751 }
1752 }
1753
1754 ret = bch2_dev_may_add(sb.sb, c);
1755 if (ret)
1756 goto err;
1757
1758 ca = __bch2_dev_alloc(c, &dev_mi);
1759 if (!ca) {
1760 ret = -ENOMEM;
1761 goto err;
1762 }
1763
1764 ret = __bch2_dev_attach_bdev(ca, &sb);
1765 if (ret)
1766 goto err;
1767
1768 ret = bch2_dev_journal_alloc(ca, true);
1769 bch_err_msg(c, ret, "allocating journal");
1770 if (ret)
1771 goto err;
1772
1773 down_write(&c->state_lock);
1774 mutex_lock(&c->sb_lock);
1775
1776 ret = bch2_sb_from_fs(c, ca);
1777 bch_err_msg(c, ret, "setting up new superblock");
1778 if (ret)
1779 goto err_unlock;
1780
1781 if (dynamic_fault("bcachefs:add:no_slot"))
1782 goto no_slot;
1783
1784 if (c->sb.nr_devices < BCH_SB_MEMBERS_MAX) {
1785 dev_idx = c->sb.nr_devices;
1786 goto have_slot;
1787 }
1788
1789 int best = -1;
1790 u64 best_last_mount = 0;
1791 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++) {
1792 struct bch_member m = bch2_sb_member_get(c->disk_sb.sb, dev_idx);
1793 if (bch2_member_alive(&m))
1794 continue;
1795
1796 u64 last_mount = le64_to_cpu(m.last_mount);
1797 if (best < 0 || last_mount < best_last_mount) {
1798 best = dev_idx;
1799 best_last_mount = last_mount;
1800 }
1801 }
1802 if (best >= 0) {
1803 dev_idx = best;
1804 goto have_slot;
1805 }
1806 no_slot:
1807 ret = -BCH_ERR_ENOSPC_sb_members;
1808 bch_err_msg(c, ret, "setting up new superblock");
1809 goto err_unlock;
1810
1811 have_slot:
1812 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1813
1814 mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
1815 u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) +
1816 le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64));
1817
1818 mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s);
1819 if (!mi) {
1820 ret = -BCH_ERR_ENOSPC_sb_members;
1821 bch_err_msg(c, ret, "setting up new superblock");
1822 goto err_unlock;
1823 }
1824 struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
1825
1826 /* success: */
1827
1828 *m = dev_mi;
1829 m->last_mount = cpu_to_le64(ktime_get_real_seconds());
1830 c->disk_sb.sb->nr_devices = nr_devices;
1831
1832 ca->disk_sb.sb->dev_idx = dev_idx;
1833 bch2_dev_attach(c, ca, dev_idx);
1834
1835 if (BCH_MEMBER_GROUP(&dev_mi)) {
1836 ret = __bch2_dev_group_set(c, ca, label.buf);
1837 bch_err_msg(c, ret, "creating new label");
1838 if (ret)
1839 goto err_unlock;
1840 }
1841
1842 bch2_write_super(c);
1843 mutex_unlock(&c->sb_lock);
1844
1845 ret = bch2_dev_usage_init(ca, false);
1846 if (ret)
1847 goto err_late;
1848
1849 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);
1850 bch_err_msg(ca, ret, "marking new superblock");
1851 if (ret)
1852 goto err_late;
1853
1854 ret = bch2_fs_freespace_init(c);
1855 bch_err_msg(ca, ret, "initializing free space");
1856 if (ret)
1857 goto err_late;
1858
1859 ca->new_fs_bucket_idx = 0;
1860
1861 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1862 __bch2_dev_read_write(c, ca);
1863
1864 up_write(&c->state_lock);
1865 return 0;
1866
1867 err_unlock:
1868 mutex_unlock(&c->sb_lock);
1869 up_write(&c->state_lock);
1870 err:
1871 if (ca)
1872 bch2_dev_free(ca);
1873 bch2_free_super(&sb);
1874 printbuf_exit(&label);
1875 printbuf_exit(&errbuf);
1876 bch_err_fn(c, ret);
1877 return ret;
1878 err_late:
1879 up_write(&c->state_lock);
1880 ca = NULL;
1881 goto err;
1882 }
1883
1884 /* Hot add existing device to running filesystem: */
1885 int bch2_dev_online(struct bch_fs *c, const char *path)
1886 {
1887 struct bch_opts opts = bch2_opts_empty();
1888 struct bch_sb_handle sb = { NULL };
1889 struct bch_dev *ca;
1890 unsigned dev_idx;
1891 int ret;
1892
1893 down_write(&c->state_lock);
1894
1895 ret = bch2_read_super(path, &opts, &sb);
1896 if (ret) {
1897 up_write(&c->state_lock);
1898 return ret;
1899 }
1900
1901 dev_idx = sb.sb->dev_idx;
1902
1903 ret = bch2_dev_in_fs(&c->disk_sb, &sb, &c->opts);
1904 bch_err_msg(c, ret, "bringing %s online", path);
1905 if (ret)
1906 goto err;
1907
1908 ret = bch2_dev_attach_bdev(c, &sb);
1909 if (ret)
1910 goto err;
1911
1912 ca = bch2_dev_locked(c, dev_idx);
1913
1914 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);
1915 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path);
1916 if (ret)
1917 goto err;
1918
1919 if (ca->mi.state == BCH_MEMBER_STATE_rw)
1920 __bch2_dev_read_write(c, ca);
1921
1922 if (!ca->mi.freespace_initialized) {
1923 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);
1924 bch_err_msg(ca, ret, "initializing free space");
1925 if (ret)
1926 goto err;
1927 }
1928
1929 if (!ca->journal.nr) {
1930 ret = bch2_dev_journal_alloc(ca, false);
1931 bch_err_msg(ca, ret, "allocating journal");
1932 if (ret)
1933 goto err;
1934 }
1935
1936 mutex_lock(&c->sb_lock);
1937 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount =
1938 cpu_to_le64(ktime_get_real_seconds());
1939 bch2_write_super(c);
1940 mutex_unlock(&c->sb_lock);
1941
1942 up_write(&c->state_lock);
1943 return 0;
1944 err:
1945 up_write(&c->state_lock);
1946 bch2_free_super(&sb);
1947 return ret;
1948 }
1949
1950 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1951 {
1952 down_write(&c->state_lock);
1953
1954 if (!bch2_dev_is_online(ca)) {
1955 bch_err(ca, "Already offline");
1956 up_write(&c->state_lock);
1957 return 0;
1958 }
1959
1960 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1961 bch_err(ca, "Cannot offline required disk");
1962 up_write(&c->state_lock);
1963 return -BCH_ERR_device_state_not_allowed;
1964 }
1965
1966 __bch2_dev_offline(c, ca);
1967
1968 up_write(&c->state_lock);
1969 return 0;
1970 }
1971
1972 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1973 {
1974 struct bch_member *m;
1975 u64 old_nbuckets;
1976 int ret = 0;
1977
1978 down_write(&c->state_lock);
1979 old_nbuckets = ca->mi.nbuckets;
1980
1981 if (nbuckets < ca->mi.nbuckets) {
1982 bch_err(ca, "Cannot shrink yet");
1983 ret = -EINVAL;
1984 goto err;
1985 }
1986
1987 if (nbuckets > BCH_MEMBER_NBUCKETS_MAX) {
1988 bch_err(ca, "New device size too big (%llu greater than max %u)",
1989 nbuckets, BCH_MEMBER_NBUCKETS_MAX);
1990 ret = -BCH_ERR_device_size_too_big;
1991 goto err;
1992 }
1993
1994 if (bch2_dev_is_online(ca) &&
1995 get_capacity(ca->disk_sb.bdev->bd_disk) <
1996 ca->mi.bucket_size * nbuckets) {
1997 bch_err(ca, "New size larger than device");
1998 ret = -BCH_ERR_device_size_too_small;
1999 goto err;
2000 }
2001
2002 ret = bch2_dev_buckets_resize(c, ca, nbuckets);
2003 bch_err_msg(ca, ret, "resizing buckets");
2004 if (ret)
2005 goto err;
2006
2007 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);
2008 if (ret)
2009 goto err;
2010
2011 mutex_lock(&c->sb_lock);
2012 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
2013 m->nbuckets = cpu_to_le64(nbuckets);
2014
2015 bch2_write_super(c);
2016 mutex_unlock(&c->sb_lock);
2017
2018 if (ca->mi.freespace_initialized) {
2019 struct disk_accounting_pos acc = {
2020 .type = BCH_DISK_ACCOUNTING_dev_data_type,
2021 .dev_data_type.dev = ca->dev_idx,
2022 .dev_data_type.data_type = BCH_DATA_free,
2023 };
2024 u64 v[3] = { nbuckets - old_nbuckets, 0, 0 };
2025
2026 ret = bch2_trans_do(ca->fs, NULL, NULL, 0,
2027 bch2_disk_accounting_mod(trans, &acc, v, ARRAY_SIZE(v), false)) ?:
2028 bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets);
2029 if (ret)
2030 goto err;
2031 }
2032
2033 bch2_recalc_capacity(c);
2034 err:
2035 up_write(&c->state_lock);
2036 return ret;
2037 }
2038
2039 /* return with ref on ca->ref: */
2040 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
2041 {
2042 if (!strncmp(name, "/dev/", strlen("/dev/")))
2043 name += strlen("/dev/");
2044
2045 for_each_member_device(c, ca)
2046 if (!strcmp(name, ca->name))
2047 return ca;
2048 return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found);
2049 }
2050
2051 /* Filesystem open: */
2052
2053 static inline int sb_cmp(struct bch_sb *l, struct bch_sb *r)
2054 {
2055 return cmp_int(le64_to_cpu(l->seq), le64_to_cpu(r->seq)) ?:
2056 cmp_int(le64_to_cpu(l->write_time), le64_to_cpu(r->write_time));
2057 }
2058
2059 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
2060 struct bch_opts opts)
2061 {
2062 DARRAY(struct bch_sb_handle) sbs = { 0 };
2063 struct bch_fs *c = NULL;
2064 struct bch_sb_handle *best = NULL;
2065 struct printbuf errbuf = PRINTBUF;
2066 int ret = 0;
2067
2068 if (!try_module_get(THIS_MODULE))
2069 return ERR_PTR(-ENODEV);
2070
2071 if (!nr_devices) {
2072 ret = -EINVAL;
2073 goto err;
2074 }
2075
2076 ret = darray_make_room(&sbs, nr_devices);
2077 if (ret)
2078 goto err;
2079
2080 for (unsigned i = 0; i < nr_devices; i++) {
2081 struct bch_sb_handle sb = { NULL };
2082
2083 ret = bch2_read_super(devices[i], &opts, &sb);
2084 if (ret)
2085 goto err;
2086
2087 BUG_ON(darray_push(&sbs, sb));
2088 }
2089
2090 if (opts.nochanges && !opts.read_only) {
2091 ret = -BCH_ERR_erofs_nochanges;
2092 goto err_print;
2093 }
2094
2095 darray_for_each(sbs, sb)
2096 if (!best || sb_cmp(sb->sb, best->sb) > 0)
2097 best = sb;
2098
2099 darray_for_each_reverse(sbs, sb) {
2100 ret = bch2_dev_in_fs(best, sb, &opts);
2101
2102 if (ret == -BCH_ERR_device_has_been_removed ||
2103 ret == -BCH_ERR_device_splitbrain) {
2104 bch2_free_super(sb);
2105 darray_remove_item(&sbs, sb);
2106 best -= best > sb;
2107 ret = 0;
2108 continue;
2109 }
2110
2111 if (ret)
2112 goto err_print;
2113 }
2114
2115 c = bch2_fs_alloc(best->sb, opts);
2116 ret = PTR_ERR_OR_ZERO(c);
2117 if (ret)
2118 goto err;
2119
2120 down_write(&c->state_lock);
2121 darray_for_each(sbs, sb) {
2122 ret = bch2_dev_attach_bdev(c, sb);
2123 if (ret) {
2124 up_write(&c->state_lock);
2125 goto err;
2126 }
2127 }
2128 up_write(&c->state_lock);
2129
2130 if (!bch2_fs_may_start(c)) {
2131 ret = -BCH_ERR_insufficient_devices_to_start;
2132 goto err_print;
2133 }
2134
2135 if (!c->opts.nostart) {
2136 ret = bch2_fs_start(c);
2137 if (ret)
2138 goto err;
2139 }
2140 out:
2141 darray_for_each(sbs, sb)
2142 bch2_free_super(sb);
2143 darray_exit(&sbs);
2144 printbuf_exit(&errbuf);
2145 module_put(THIS_MODULE);
2146 return c;
2147 err_print:
2148 pr_err("bch_fs_open err opening %s: %s",
2149 devices[0], bch2_err_str(ret));
2150 err:
2151 if (!IS_ERR_OR_NULL(c))
2152 bch2_fs_stop(c);
2153 c = ERR_PTR(ret);
2154 goto out;
2155 }
2156
2157 /* Global interfaces/init */
2158
2159 static void bcachefs_exit(void)
2160 {
2161 bch2_debug_exit();
2162 bch2_vfs_exit();
2163 bch2_chardev_exit();
2164 bch2_btree_key_cache_exit();
2165 if (bcachefs_kset)
2166 kset_unregister(bcachefs_kset);
2167 }
2168
2169 static int __init bcachefs_init(void)
2170 {
2171 bch2_bkey_pack_test();
2172
2173 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
2174 bch2_btree_key_cache_init() ||
2175 bch2_chardev_init() ||
2176 bch2_vfs_init() ||
2177 bch2_debug_init())
2178 goto err;
2179
2180 return 0;
2181 err:
2182 bcachefs_exit();
2183 return -ENOMEM;
2184 }
2185
2186 #define BCH_DEBUG_PARAM(name, description) \
2187 bool bch2_##name; \
2188 module_param_named(name, bch2_##name, bool, 0644); \
2189 MODULE_PARM_DESC(name, description);
2190 BCH_DEBUG_PARAMS()
2191 #undef BCH_DEBUG_PARAM
2192
2193 __maybe_unused
2194 static unsigned bch2_metadata_version = bcachefs_metadata_version_current;
2195 module_param_named(version, bch2_metadata_version, uint, 0400);
2196
2197 module_exit(bcachefs_exit);
2198 module_init(bcachefs_init);
2199
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