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bcachefs: fix waiting on an open journal entry
[linux-block.git] / fs / bcachefs / super.c
CommitLineData
1c6fdbd8
KO		 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"
7b3f84ea
KO		 11#include "alloc_background.h"
12#include "alloc_foreground.h"
1c6fdbd8
KO		 13#include "btree_cache.h"
14#include "btree_gc.h"
15#include "btree_update_interior.h"
16#include "btree_io.h"
17#include "chardev.h"
18#include "checksum.h"
19#include "clock.h"
20#include "compress.h"
21#include "debug.h"
22#include "disk_groups.h"
cd575ddf 23#include "ec.h"
1c6fdbd8
KO		 24#include "error.h"
25#include "fs.h"
26#include "fs-io.h"
27#include "fsck.h"
28#include "inode.h"
29#include "io.h"
30#include "journal.h"
31#include "journal_reclaim.h"
32#include "move.h"
33#include "migrate.h"
34#include "movinggc.h"
35#include "quota.h"
36#include "rebalance.h"
37#include "recovery.h"
38#include "replicas.h"
39#include "super.h"
40#include "super-io.h"
41#include "sysfs.h"
42#include "trace.h"
43
44#include <linux/backing-dev.h>
45#include <linux/blkdev.h>
46#include <linux/debugfs.h>
47#include <linux/device.h>
48#include <linux/idr.h>
49#include <linux/kthread.h>
50#include <linux/module.h>
51#include <linux/percpu.h>
52#include <linux/random.h>
53#include <linux/sysfs.h>
54#include <crypto/hash.h>
55
56MODULE_LICENSE("GPL");
57MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
58
59#define KTYPE(type) \
60static const struct attribute_group type ## _group = { \
61 .attrs = type ## _files \
62}; \
63 \
64static const struct attribute_group *type ## _groups[] = { \
65 &type ## _group, \
66 NULL \
67}; \
68 \
69static const struct kobj_type type ## _ktype = { \
70 .release = type ## _release, \
71 .sysfs_ops = &type ## _sysfs_ops, \
72 .default_groups = type ## _groups \
73}
74
75static void bch2_fs_release(struct kobject *);
76static void bch2_dev_release(struct kobject *);
77
78static void bch2_fs_internal_release(struct kobject *k)
79{
80}
81
82static void bch2_fs_opts_dir_release(struct kobject *k)
83{
84}
85
86static void bch2_fs_time_stats_release(struct kobject *k)
87{
88}
89
90KTYPE(bch2_fs);
91KTYPE(bch2_fs_internal);
92KTYPE(bch2_fs_opts_dir);
93KTYPE(bch2_fs_time_stats);
94KTYPE(bch2_dev);
95
96static struct kset *bcachefs_kset;
97static LIST_HEAD(bch_fs_list);
98static DEFINE_MUTEX(bch_fs_list_lock);
99
100static DECLARE_WAIT_QUEUE_HEAD(bch_read_only_wait);
101
102static void bch2_dev_free(struct bch_dev *);
103static int bch2_dev_alloc(struct bch_fs *, unsigned);
104static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
105static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
106
107struct bch_fs *bch2_dev_to_fs(dev_t dev)
108{
109 struct bch_fs *c;
110 struct bch_dev *ca;
111 unsigned i;
112
113 mutex_lock(&bch_fs_list_lock);
114 rcu_read_lock();
115
116 list_for_each_entry(c, &bch_fs_list, list)
117 for_each_member_device_rcu(ca, c, i, NULL)
118 if (ca->disk_sb.bdev->bd_dev == dev) {
119 closure_get(&c->cl);
120 goto found;
121 }
122 c = NULL;
123found:
124 rcu_read_unlock();
125 mutex_unlock(&bch_fs_list_lock);
126
127 return c;
128}
129
130static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)
131{
132 struct bch_fs *c;
133
134 lockdep_assert_held(&bch_fs_list_lock);
135
136 list_for_each_entry(c, &bch_fs_list, list)
137 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))
138 return c;
139
140 return NULL;
141}
142
143struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)
144{
145 struct bch_fs *c;
146
147 mutex_lock(&bch_fs_list_lock);
148 c = __bch2_uuid_to_fs(uuid);
149 if (c)
150 closure_get(&c->cl);
151 mutex_unlock(&bch_fs_list_lock);
152
153 return c;
154}
155
156/* Filesystem RO/RW: */
157
158/*
159 * For startup/shutdown of RW stuff, the dependencies are:
160 *
161 * - foreground writes depend on copygc and rebalance (to free up space)
162 *
163 * - copygc and rebalance depend on mark and sweep gc (they actually probably
164 * don't because they either reserve ahead of time or don't block if
165 * allocations fail, but allocations can require mark and sweep gc to run
166 * because of generation number wraparound)
167 *
168 * - all of the above depends on the allocator threads
169 *
170 * - allocator depends on the journal (when it rewrites prios and gens)
171 */
172
173static void __bch2_fs_read_only(struct bch_fs *c)
174{
175 struct bch_dev *ca;
176 unsigned i;
177
178 bch2_rebalance_stop(c);
179
180 for_each_member_device(ca, c, i)
181 bch2_copygc_stop(ca);
182
183 bch2_gc_thread_stop(c);
184
185 /*
186 * Flush journal before stopping allocators, because flushing journal
187 * blacklist entries involves allocating new btree nodes:
188 */
189 bch2_journal_flush_all_pins(&c->journal);
190
191 for_each_member_device(ca, c, i)
192 bch2_dev_allocator_stop(ca);
193
194 bch2_journal_flush_all_pins(&c->journal);
195
196 /*
197 * We need to explicitly wait on btree interior updates to complete
198 * before stopping the journal, flushing all journal pins isn't
199 * sufficient, because in the BTREE_INTERIOR_UPDATING_ROOT case btree
200 * interior updates have to drop their journal pin before they're
201 * fully complete:
202 */
203 closure_wait_event(&c->btree_interior_update_wait,
204 !bch2_btree_interior_updates_nr_pending(c));
205
206 bch2_fs_journal_stop(&c->journal);
207
208 /*
209 * the journal kicks off btree writes via reclaim - wait for in flight
210 * writes after stopping journal:
211 */
212 if (test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
213 bch2_btree_flush_all_writes(c);
214 else
215 bch2_btree_verify_flushed(c);
216
217 /*
218 * After stopping journal:
219 */
220 for_each_member_device(ca, c, i)
221 bch2_dev_allocator_remove(c, ca);
222}
223
224static void bch2_writes_disabled(struct percpu_ref *writes)
225{
226 struct bch_fs *c = container_of(writes, struct bch_fs, writes);
227
228 set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
229 wake_up(&bch_read_only_wait);
230}
231
232void bch2_fs_read_only(struct bch_fs *c)
233{
234 if (c->state == BCH_FS_RO)
235 return;
236
237 BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
238
239 /*
240 * Block new foreground-end write operations from starting - any new
241 * writes will return -EROFS:
242 *
243 * (This is really blocking new _allocations_, writes to previously
244 * allocated space can still happen until stopping the allocator in
245 * bch2_dev_allocator_stop()).
246 */
247 percpu_ref_kill(&c->writes);
248
249 cancel_delayed_work(&c->pd_controllers_update);
250
251 /*
252 * If we're not doing an emergency shutdown, we want to wait on
253 * outstanding writes to complete so they don't see spurious errors due
254 * to shutting down the allocator:
255 *
256 * If we are doing an emergency shutdown outstanding writes may
257 * hang until we shutdown the allocator so we don't want to wait
258 * on outstanding writes before shutting everything down - but
259 * we do need to wait on them before returning and signalling
260 * that going RO is complete:
261 */
262 wait_event(bch_read_only_wait,
263 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
264 test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
265
266 __bch2_fs_read_only(c);
267
268 wait_event(bch_read_only_wait,
269 test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
270
271 clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
272
273 if (!bch2_journal_error(&c->journal) &&
274 !test_bit(BCH_FS_ERROR, &c->flags) &&
275 !test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
276 bch2_fs_mark_clean(c, true);
277
278 if (c->state != BCH_FS_STOPPING)
279 c->state = BCH_FS_RO;
280}
281
282static void bch2_fs_read_only_work(struct work_struct *work)
283{
284 struct bch_fs *c =
285 container_of(work, struct bch_fs, read_only_work);
286
287 mutex_lock(&c->state_lock);
288 bch2_fs_read_only(c);
289 mutex_unlock(&c->state_lock);
290}
291
292static void bch2_fs_read_only_async(struct bch_fs *c)
293{
294 queue_work(system_long_wq, &c->read_only_work);
295}
296
297bool bch2_fs_emergency_read_only(struct bch_fs *c)
298{
299 bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags);
300
301 bch2_fs_read_only_async(c);
302 bch2_journal_halt(&c->journal);
303
304 wake_up(&bch_read_only_wait);
305 return ret;
306}
307
308const char *bch2_fs_read_write(struct bch_fs *c)
309{
310 struct bch_dev *ca;
311 const char *err = NULL;
312 unsigned i;
313
314 if (c->state == BCH_FS_RW)
315 return NULL;
316
317 bch2_fs_mark_clean(c, false);
318
319 for_each_rw_member(ca, c, i)
320 bch2_dev_allocator_add(c, ca);
321 bch2_recalc_capacity(c);
322
323 err = "error starting allocator thread";
324 for_each_rw_member(ca, c, i)
325 if (bch2_dev_allocator_start(ca)) {
326 percpu_ref_put(&ca->io_ref);
327 goto err;
328 }
329
330 err = "error starting btree GC thread";
331 if (bch2_gc_thread_start(c))
332 goto err;
333
334 err = "error starting copygc thread";
335 for_each_rw_member(ca, c, i)
336 if (bch2_copygc_start(c, ca)) {
337 percpu_ref_put(&ca->io_ref);
338 goto err;
339 }
340
341 err = "error starting rebalance thread";
342 if (bch2_rebalance_start(c))
343 goto err;
344
345 schedule_delayed_work(&c->pd_controllers_update, 5 * HZ);
346
347 if (c->state != BCH_FS_STARTING)
348 percpu_ref_reinit(&c->writes);
349
350 c->state = BCH_FS_RW;
351 return NULL;
352err:
353 __bch2_fs_read_only(c);
354 return err;
355}
356
357/* Filesystem startup/shutdown: */
358
359static void bch2_fs_free(struct bch_fs *c)
360{
361 unsigned i;
362
363 for (i = 0; i < BCH_TIME_STAT_NR; i++)
364 bch2_time_stats_exit(&c->times[i]);
365
366 bch2_fs_quota_exit(c);
367 bch2_fs_fsio_exit(c);
cd575ddf 368 bch2_fs_ec_exit(c);
1c6fdbd8
KO		 369 bch2_fs_encryption_exit(c);
370 bch2_fs_io_exit(c);
371 bch2_fs_btree_cache_exit(c);
372 bch2_fs_journal_exit(&c->journal);
373 bch2_io_clock_exit(&c->io_clock[WRITE]);
374 bch2_io_clock_exit(&c->io_clock[READ]);
375 bch2_fs_compress_exit(c);
376 percpu_free_rwsem(&c->usage_lock);
9ca53b55 377 free_percpu(c->usage[0]);
581edb63 378 mempool_exit(&c->btree_iters_pool);
1c6fdbd8
KO		 379 mempool_exit(&c->btree_bounce_pool);
380 bioset_exit(&c->btree_bio);
381 mempool_exit(&c->btree_interior_update_pool);
382 mempool_exit(&c->btree_reserve_pool);
383 mempool_exit(&c->fill_iter);
384 percpu_ref_exit(&c->writes);
385 kfree(rcu_dereference_protected(c->replicas, 1));
386 kfree(rcu_dereference_protected(c->disk_groups, 1));
387
388 if (c->copygc_wq)
389 destroy_workqueue(c->copygc_wq);
390 if (c->wq)
391 destroy_workqueue(c->wq);
392
393 free_pages((unsigned long) c->disk_sb.sb,
394 c->disk_sb.page_order);
395 kvpfree(c, sizeof(*c));
396 module_put(THIS_MODULE);
397}
398
399static void bch2_fs_release(struct kobject *kobj)
400{
401 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
402
403 bch2_fs_free(c);
404}
405
406void bch2_fs_stop(struct bch_fs *c)
407{
408 struct bch_dev *ca;
409 unsigned i;
410
af1c6871
KO		 411 bch_verbose(c, "shutting down");
412
1c6fdbd8
KO		 413 for_each_member_device(ca, c, i)
414 if (ca->kobj.state_in_sysfs &&
415 ca->disk_sb.bdev)
416 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
417
418 if (c->kobj.state_in_sysfs)
419 kobject_del(&c->kobj);
420
421 bch2_fs_debug_exit(c);
422 bch2_fs_chardev_exit(c);
423
424 kobject_put(&c->time_stats);
425 kobject_put(&c->opts_dir);
426 kobject_put(&c->internal);
427
428 mutex_lock(&bch_fs_list_lock);
429 list_del(&c->list);
430 mutex_unlock(&bch_fs_list_lock);
431
432 closure_sync(&c->cl);
433 closure_debug_destroy(&c->cl);
434
435 mutex_lock(&c->state_lock);
436 bch2_fs_read_only(c);
437 mutex_unlock(&c->state_lock);
438
439 /* btree prefetch might have kicked off reads in the background: */
440 bch2_btree_flush_all_reads(c);
441
442 for_each_member_device(ca, c, i)
443 cancel_work_sync(&ca->io_error_work);
444
445 cancel_work_sync(&c->btree_write_error_work);
446 cancel_delayed_work_sync(&c->pd_controllers_update);
447 cancel_work_sync(&c->read_only_work);
448
449 for (i = 0; i < c->sb.nr_devices; i++)
450 if (c->devs[i])
451 bch2_dev_free(rcu_dereference_protected(c->devs[i], 1));
452
af1c6871
KO		 453 bch_verbose(c, "shutdown complete");
454
1c6fdbd8
KO		 455 kobject_put(&c->kobj);
456}
457
458static const char *bch2_fs_online(struct bch_fs *c)
459{
460 struct bch_dev *ca;
461 const char *err = NULL;
462 unsigned i;
463 int ret;
464
465 lockdep_assert_held(&bch_fs_list_lock);
466
467 if (!list_empty(&c->list))
468 return NULL;
469
470 if (__bch2_uuid_to_fs(c->sb.uuid))
471 return "filesystem UUID already open";
472
473 ret = bch2_fs_chardev_init(c);
474 if (ret)
475 return "error creating character device";
476
477 bch2_fs_debug_init(c);
478
479 if (kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ||
480 kobject_add(&c->internal, &c->kobj, "internal") ||
481 kobject_add(&c->opts_dir, &c->kobj, "options") ||
482 kobject_add(&c->time_stats, &c->kobj, "time_stats") ||
483 bch2_opts_create_sysfs_files(&c->opts_dir))
484 return "error creating sysfs objects";
485
486 mutex_lock(&c->state_lock);
487
488 err = "error creating sysfs objects";
489 __for_each_member_device(ca, c, i, NULL)
490 if (bch2_dev_sysfs_online(c, ca))
491 goto err;
492
493 list_add(&c->list, &bch_fs_list);
494 err = NULL;
495err:
496 mutex_unlock(&c->state_lock);
497 return err;
498}
499
500static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
501{
502 struct bch_sb_field_members *mi;
503 struct bch_fs *c;
504 unsigned i, iter_size;
505 const char *err;
506
507 pr_verbose_init(opts, "");
508
509 c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
510 if (!c)
511 goto out;
512
513 __module_get(THIS_MODULE);
514
515 c->minor = -1;
516 c->disk_sb.fs_sb = true;
517
518 mutex_init(&c->state_lock);
519 mutex_init(&c->sb_lock);
520 mutex_init(&c->replicas_gc_lock);
521 mutex_init(&c->btree_root_lock);
522 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
523
524 init_rwsem(&c->gc_lock);
525
526 for (i = 0; i < BCH_TIME_STAT_NR; i++)
527 bch2_time_stats_init(&c->times[i]);
528
b092dadd
KO		 529 bch2_fs_allocator_background_init(c);
530 bch2_fs_allocator_foreground_init(c);
1c6fdbd8
KO		 531 bch2_fs_rebalance_init(c);
532 bch2_fs_quota_init(c);
533
534 INIT_LIST_HEAD(&c->list);
535
536 INIT_LIST_HEAD(&c->btree_interior_update_list);
537 mutex_init(&c->btree_reserve_cache_lock);
538 mutex_init(&c->btree_interior_update_lock);
539
540 mutex_init(&c->bio_bounce_pages_lock);
541
542 bio_list_init(&c->btree_write_error_list);
543 spin_lock_init(&c->btree_write_error_lock);
544 INIT_WORK(&c->btree_write_error_work, bch2_btree_write_error_work);
545
546 INIT_LIST_HEAD(&c->fsck_errors);
547 mutex_init(&c->fsck_error_lock);
548
cd575ddf
KO		 549 INIT_LIST_HEAD(&c->ec_new_stripe_list);
550 mutex_init(&c->ec_new_stripe_lock);
dfe9bfb3 551 mutex_init(&c->ec_stripe_create_lock);
cd575ddf
KO		 552 spin_lock_init(&c->ec_stripes_heap_lock);
553
1c6fdbd8
KO		 554 seqcount_init(&c->gc_pos_lock);
555
556 c->copy_gc_enabled = 1;
557 c->rebalance.enabled = 1;
558 c->promote_whole_extents = true;
559
560 c->journal.write_time = &c->times[BCH_TIME_journal_write];
561 c->journal.delay_time = &c->times[BCH_TIME_journal_delay];
562 c->journal.blocked_time = &c->times[BCH_TIME_journal_blocked];
563 c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
564
565 bch2_fs_btree_cache_init_early(&c->btree_cache);
566
567 mutex_lock(&c->sb_lock);
568
569 if (bch2_sb_to_fs(c, sb)) {
570 mutex_unlock(&c->sb_lock);
571 goto err;
572 }
573
574 mutex_unlock(&c->sb_lock);
575
576 scnprintf(c->name, sizeof(c->name), "%pU", &c->sb.user_uuid);
577
578 c->opts = bch2_opts_default;
579 bch2_opts_apply(&c->opts, bch2_opts_from_sb(sb));
580 bch2_opts_apply(&c->opts, opts);
581
582 c->block_bits = ilog2(c->opts.block_size);
583 c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
584
585 c->opts.nochanges |= c->opts.noreplay;
586 c->opts.read_only |= c->opts.nochanges;
587
588 if (bch2_fs_init_fault("fs_alloc"))
589 goto err;
590
591 iter_size = sizeof(struct btree_node_iter_large) +
592 (btree_blocks(c) + 1) * 2 *
593 sizeof(struct btree_node_iter_set);
594
595 if (!(c->wq = alloc_workqueue("bcachefs",
596 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) ||
597 !(c->copygc_wq = alloc_workqueue("bcache_copygc",
598 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) ||
599 percpu_ref_init(&c->writes, bch2_writes_disabled, 0, GFP_KERNEL) ||
600 mempool_init_kmalloc_pool(&c->btree_reserve_pool, 1,
601 sizeof(struct btree_reserve)) ||
602 mempool_init_kmalloc_pool(&c->btree_interior_update_pool, 1,
603 sizeof(struct btree_update)) ||
604 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
605 bioset_init(&c->btree_bio, 1,
606 max(offsetof(struct btree_read_bio, bio),
607 offsetof(struct btree_write_bio, wbio.bio)),
608 BIOSET_NEED_BVECS) ||
9ca53b55 609 !(c->usage[0] = alloc_percpu(struct bch_fs_usage)) ||
1c6fdbd8
KO		 610 percpu_init_rwsem(&c->usage_lock) ||
611 mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
612 btree_bytes(c)) ||
581edb63
KO		 613 mempool_init_kmalloc_pool(&c->btree_iters_pool, 1,
614 sizeof(struct btree_iter) * BTREE_ITER_MAX) ||
1c6fdbd8
KO		 615 bch2_io_clock_init(&c->io_clock[READ]) ||
616 bch2_io_clock_init(&c->io_clock[WRITE]) ||
617 bch2_fs_journal_init(&c->journal) ||
618 bch2_fs_btree_cache_init(c) ||
619 bch2_fs_io_init(c) ||
620 bch2_fs_encryption_init(c) ||
621 bch2_fs_compress_init(c) ||
cd575ddf 622 bch2_fs_ec_init(c) ||
1c6fdbd8
KO		 623 bch2_fs_fsio_init(c))
624 goto err;
625
626 mi = bch2_sb_get_members(c->disk_sb.sb);
627 for (i = 0; i < c->sb.nr_devices; i++)
628 if (bch2_dev_exists(c->disk_sb.sb, mi, i) &&
629 bch2_dev_alloc(c, i))
630 goto err;
631
632 /*
633 * Now that all allocations have succeeded, init various refcounty
634 * things that let us shutdown:
635 */
636 closure_init(&c->cl, NULL);
637
638 c->kobj.kset = bcachefs_kset;
639 kobject_init(&c->kobj, &bch2_fs_ktype);
640 kobject_init(&c->internal, &bch2_fs_internal_ktype);
641 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
642 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
643
644 mutex_lock(&bch_fs_list_lock);
645 err = bch2_fs_online(c);
646 mutex_unlock(&bch_fs_list_lock);
647 if (err) {
648 bch_err(c, "bch2_fs_online() error: %s", err);
649 goto err;
650 }
651out:
652 pr_verbose_init(opts, "ret %i", c ? 0 : -ENOMEM);
653 return c;
654err:
655 bch2_fs_free(c);
656 c = NULL;
657 goto out;
658}
659
660const char *bch2_fs_start(struct bch_fs *c)
661{
662 const char *err = "cannot allocate memory";
663 struct bch_sb_field_members *mi;
664 struct bch_dev *ca;
a420eea6 665 time64_t now = ktime_get_real_seconds();
1c6fdbd8
KO		 666 unsigned i;
667 int ret = -EINVAL;
668
669 mutex_lock(&c->state_lock);
670
671 BUG_ON(c->state != BCH_FS_STARTING);
672
673 mutex_lock(&c->sb_lock);
674
675 for_each_online_member(ca, c, i)
676 bch2_sb_from_fs(c, ca);
677
678 mi = bch2_sb_get_members(c->disk_sb.sb);
679 for_each_online_member(ca, c, i)
680 mi->members[ca->dev_idx].last_mount = cpu_to_le64(now);
681
682 mutex_unlock(&c->sb_lock);
683
684 for_each_rw_member(ca, c, i)
685 bch2_dev_allocator_add(c, ca);
686 bch2_recalc_capacity(c);
687
688 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
689 ? bch2_fs_recovery(c)
690 : bch2_fs_initialize(c);
691 if (ret)
692 goto err;
cd575ddf
KO		 693
694 ret = bch2_opts_check_may_set(c);
695 if (ret)
696 goto err;
1c6fdbd8
KO		 697
698 err = "dynamic fault";
699 if (bch2_fs_init_fault("fs_start"))
700 goto err;
701
702 if (c->opts.read_only) {
703 bch2_fs_read_only(c);
704 } else {
705 err = bch2_fs_read_write(c);
706 if (err)
707 goto err;
708 }
709
710 set_bit(BCH_FS_STARTED, &c->flags);
711
712 err = NULL;
713out:
714 mutex_unlock(&c->state_lock);
715 return err;
716err:
717 switch (ret) {
718 case BCH_FSCK_ERRORS_NOT_FIXED:
719 bch_err(c, "filesystem contains errors: please report this to the developers");
720 pr_cont("mount with -o fix_errors to repair\n");
721 err = "fsck error";
722 break;
723 case BCH_FSCK_REPAIR_UNIMPLEMENTED:
724 bch_err(c, "filesystem contains errors: please report this to the developers");
725 pr_cont("repair unimplemented: inform the developers so that it can be added\n");
726 err = "fsck error";
727 break;
728 case BCH_FSCK_REPAIR_IMPOSSIBLE:
729 bch_err(c, "filesystem contains errors, but repair impossible");
730 err = "fsck error";
731 break;
732 case BCH_FSCK_UNKNOWN_VERSION:
733 err = "unknown metadata version";;
734 break;
735 case -ENOMEM:
736 err = "cannot allocate memory";
737 break;
738 case -EIO:
739 err = "IO error";
740 break;
741 }
742
743 BUG_ON(!err);
744 set_bit(BCH_FS_ERROR, &c->flags);
745 goto out;
746}
747
748static const char *bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
749{
750 struct bch_sb_field_members *sb_mi;
751
752 sb_mi = bch2_sb_get_members(sb);
753 if (!sb_mi)
754 return "Invalid superblock: member info area missing";
755
756 if (le16_to_cpu(sb->block_size) != c->opts.block_size)
757 return "mismatched block size";
758
759 if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <
760 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
761 return "new cache bucket size is too small";
762
763 return NULL;
764}
765
766static const char *bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
767{
768 struct bch_sb *newest =
769 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
770 struct bch_sb_field_members *mi = bch2_sb_get_members(newest);
771
772 if (!uuid_equal(&fs->uuid, &sb->uuid))
773 return "device not a member of filesystem";
774
775 if (!bch2_dev_exists(newest, mi, sb->dev_idx))
776 return "device has been removed";
777
778 if (fs->block_size != sb->block_size)
779 return "mismatched block size";
780
781 return NULL;
782}
783
784/* Device startup/shutdown: */
785
786static void bch2_dev_release(struct kobject *kobj)
787{
788 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
789
790 kfree(ca);
791}
792
793static void bch2_dev_free(struct bch_dev *ca)
794{
795 cancel_work_sync(&ca->io_error_work);
796
797 if (ca->kobj.state_in_sysfs &&
798 ca->disk_sb.bdev)
799 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
800
801 if (ca->kobj.state_in_sysfs)
802 kobject_del(&ca->kobj);
803
804 bch2_free_super(&ca->disk_sb);
805 bch2_dev_journal_exit(ca);
806
807 free_percpu(ca->io_done);
808 bioset_exit(&ca->replica_set);
809 bch2_dev_buckets_free(ca);
810
811 bch2_time_stats_exit(&ca->io_latency[WRITE]);
812 bch2_time_stats_exit(&ca->io_latency[READ]);
813
814 percpu_ref_exit(&ca->io_ref);
815 percpu_ref_exit(&ca->ref);
816 kobject_put(&ca->kobj);
817}
818
819static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
820{
821
822 lockdep_assert_held(&c->state_lock);
823
824 if (percpu_ref_is_zero(&ca->io_ref))
825 return;
826
827 __bch2_dev_read_only(c, ca);
828
829 reinit_completion(&ca->io_ref_completion);
830 percpu_ref_kill(&ca->io_ref);
831 wait_for_completion(&ca->io_ref_completion);
832
833 if (ca->kobj.state_in_sysfs) {
834 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
835 sysfs_remove_link(&ca->kobj, "block");
836 }
837
838 bch2_free_super(&ca->disk_sb);
839 bch2_dev_journal_exit(ca);
840}
841
842static void bch2_dev_ref_complete(struct percpu_ref *ref)
843{
844 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
845
846 complete(&ca->ref_completion);
847}
848
849static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
850{
851 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
852
853 complete(&ca->io_ref_completion);
854}
855
856static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
857{
858 int ret;
859
860 if (!c->kobj.state_in_sysfs)
861 return 0;
862
863 if (!ca->kobj.state_in_sysfs) {
864 ret = kobject_add(&ca->kobj, &c->kobj,
865 "dev-%u", ca->dev_idx);
866 if (ret)
867 return ret;
868 }
869
870 if (ca->disk_sb.bdev) {
871 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
872
873 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
874 if (ret)
875 return ret;
876
877 ret = sysfs_create_link(&ca->kobj, block, "block");
878 if (ret)
879 return ret;
880 }
881
882 return 0;
883}
884
885static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
886 struct bch_member *member)
887{
888 struct bch_dev *ca;
889
890 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
891 if (!ca)
892 return NULL;
893
894 kobject_init(&ca->kobj, &bch2_dev_ktype);
895 init_completion(&ca->ref_completion);
896 init_completion(&ca->io_ref_completion);
897
898 init_rwsem(&ca->bucket_lock);
899
900 writepoint_init(&ca->copygc_write_point, BCH_DATA_USER);
901
902 spin_lock_init(&ca->freelist_lock);
903 bch2_dev_copygc_init(ca);
904
905 INIT_WORK(&ca->io_error_work, bch2_io_error_work);
906
907 bch2_time_stats_init(&ca->io_latency[READ]);
908 bch2_time_stats_init(&ca->io_latency[WRITE]);
909
910 ca->mi = bch2_mi_to_cpu(member);
911 ca->uuid = member->uuid;
912
913 if (opt_defined(c->opts, discard))
914 ca->mi.discard = opt_get(c->opts, discard);
915
916 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
917 0, GFP_KERNEL) ||
918 percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
919 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
920 bch2_dev_buckets_alloc(c, ca) ||
921 bioset_init(&ca->replica_set, 4,
922 offsetof(struct bch_write_bio, bio), 0) ||
923 !(ca->io_done = alloc_percpu(*ca->io_done)))
924 goto err;
925
926 return ca;
927err:
928 bch2_dev_free(ca);
929 return NULL;
930}
931
932static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
933 unsigned dev_idx)
934{
935 ca->dev_idx = dev_idx;
936 __set_bit(ca->dev_idx, ca->self.d);
937 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
938
939 ca->fs = c;
940 rcu_assign_pointer(c->devs[ca->dev_idx], ca);
941
942 if (bch2_dev_sysfs_online(c, ca))
943 pr_warn("error creating sysfs objects");
944}
945
946static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
947{
948 struct bch_member *member =
949 bch2_sb_get_members(c->disk_sb.sb)->members + dev_idx;
950 struct bch_dev *ca = NULL;
951 int ret = 0;
952
953 pr_verbose_init(c->opts, "");
954
955 if (bch2_fs_init_fault("dev_alloc"))
956 goto err;
957
958 ca = __bch2_dev_alloc(c, member);
959 if (!ca)
960 goto err;
961
962 bch2_dev_attach(c, ca, dev_idx);
963out:
964 pr_verbose_init(c->opts, "ret %i", ret);
965 return ret;
966err:
967 if (ca)
968 bch2_dev_free(ca);
969 ret = -ENOMEM;
970 goto out;
971}
972
973static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
974{
975 unsigned ret;
976
977 if (bch2_dev_is_online(ca)) {
978 bch_err(ca, "already have device online in slot %u",
979 sb->sb->dev_idx);
980 return -EINVAL;
981 }
982
983 if (get_capacity(sb->bdev->bd_disk) <
984 ca->mi.bucket_size * ca->mi.nbuckets) {
985 bch_err(ca, "cannot online: device too small");
986 return -EINVAL;
987 }
988
989 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
990
991 if (get_capacity(sb->bdev->bd_disk) <
992 ca->mi.bucket_size * ca->mi.nbuckets) {
993 bch_err(ca, "device too small");
994 return -EINVAL;
995 }
996
997 ret = bch2_dev_journal_init(ca, sb->sb);
998 if (ret)
999 return ret;
1000
1001 /* Commit: */
1002 ca->disk_sb = *sb;
1003 memset(sb, 0, sizeof(*sb));
1004
1c6fdbd8
KO		 1005 percpu_ref_reinit(&ca->io_ref);
1006
1007 return 0;
1008}
1009
1010static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1011{
1012 struct bch_dev *ca;
1013 int ret;
1014
1015 lockdep_assert_held(&c->state_lock);
1016
1017 if (le64_to_cpu(sb->sb->seq) >
1018 le64_to_cpu(c->disk_sb.sb->seq))
1019 bch2_sb_to_fs(c, sb->sb);
1020
1021 BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1022 !c->devs[sb->sb->dev_idx]);
1023
1024 ca = bch_dev_locked(c, sb->sb->dev_idx);
1025
1026 ret = __bch2_dev_attach_bdev(ca, sb);
1027 if (ret)
1028 return ret;
1029
6eac2c2e 1030 mutex_lock(&c->sb_lock);
9ca53b55 1031 bch2_mark_dev_superblock(ca->fs, ca, 0);
6eac2c2e
KO		 1032 mutex_unlock(&c->sb_lock);
1033
1c6fdbd8
KO		 1034 bch2_dev_sysfs_online(c, ca);
1035
1036 if (c->sb.nr_devices == 1)
1037 snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev);
1038 snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev);
1039
1040 rebalance_wakeup(c);
1041 return 0;
1042}
1043
1044/* Device management: */
1045
1046/*
1047 * Note: this function is also used by the error paths - when a particular
1048 * device sees an error, we call it to determine whether we can just set the
1049 * device RO, or - if this function returns false - we'll set the whole
1050 * filesystem RO:
1051 *
1052 * XXX: maybe we should be more explicit about whether we're changing state
1053 * because we got an error or what have you?
1054 */
1055bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1056 enum bch_member_state new_state, int flags)
1057{
1058 struct bch_devs_mask new_online_devs;
1059 struct replicas_status s;
1060 struct bch_dev *ca2;
1061 int i, nr_rw = 0, required;
1062
1063 lockdep_assert_held(&c->state_lock);
1064
1065 switch (new_state) {
1066 case BCH_MEMBER_STATE_RW:
1067 return true;
1068 case BCH_MEMBER_STATE_RO:
1069 if (ca->mi.state != BCH_MEMBER_STATE_RW)
1070 return true;
1071
1072 /* do we have enough devices to write to? */
1073 for_each_member_device(ca2, c, i)
1074 if (ca2 != ca)
1075 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_RW;
1076
1077 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1078 ? c->opts.metadata_replicas
1079 : c->opts.metadata_replicas_required,
1080 !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1081 ? c->opts.data_replicas
1082 : c->opts.data_replicas_required);
1083
1084 return nr_rw >= required;
1085 case BCH_MEMBER_STATE_FAILED:
1086 case BCH_MEMBER_STATE_SPARE:
1087 if (ca->mi.state != BCH_MEMBER_STATE_RW &&
1088 ca->mi.state != BCH_MEMBER_STATE_RO)
1089 return true;
1090
1091 /* do we have enough devices to read from? */
1092 new_online_devs = bch2_online_devs(c);
1093 __clear_bit(ca->dev_idx, new_online_devs.d);
1094
1095 s = __bch2_replicas_status(c, new_online_devs);
1096
1097 return bch2_have_enough_devs(s, flags);
1098 default:
1099 BUG();
1100 }
1101}
1102
1103static bool bch2_fs_may_start(struct bch_fs *c)
1104{
1105 struct replicas_status s;
1106 struct bch_sb_field_members *mi;
1107 struct bch_dev *ca;
1108 unsigned i, flags = c->opts.degraded
1109 ? BCH_FORCE_IF_DEGRADED
1110 : 0;
1111
1112 if (!c->opts.degraded) {
1113 mutex_lock(&c->sb_lock);
1114 mi = bch2_sb_get_members(c->disk_sb.sb);
1115
1116 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1117 if (!bch2_dev_exists(c->disk_sb.sb, mi, i))
1118 continue;
1119
1120 ca = bch_dev_locked(c, i);
1121
1122 if (!bch2_dev_is_online(ca) &&
1123 (ca->mi.state == BCH_MEMBER_STATE_RW ||
1124 ca->mi.state == BCH_MEMBER_STATE_RO)) {
1125 mutex_unlock(&c->sb_lock);
1126 return false;
1127 }
1128 }
1129 mutex_unlock(&c->sb_lock);
1130 }
1131
1132 s = bch2_replicas_status(c);
1133
1134 return bch2_have_enough_devs(s, flags);
1135}
1136
1137static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1138{
1139 bch2_copygc_stop(ca);
1140
1141 /*
1142 * The allocator thread itself allocates btree nodes, so stop it first:
1143 */
1144 bch2_dev_allocator_stop(ca);
1145 bch2_dev_allocator_remove(c, ca);
1146 bch2_dev_journal_stop(&c->journal, ca);
1147}
1148
1149static const char *__bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1150{
1151 lockdep_assert_held(&c->state_lock);
1152
1153 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_RW);
1154
1155 bch2_dev_allocator_add(c, ca);
1156 bch2_recalc_capacity(c);
1157
1158 if (bch2_dev_allocator_start(ca))
1159 return "error starting allocator thread";
1160
1161 if (bch2_copygc_start(c, ca))
1162 return "error starting copygc thread";
1163
1164 return NULL;
1165}
1166
1167int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1168 enum bch_member_state new_state, int flags)
1169{
1170 struct bch_sb_field_members *mi;
1171 int ret = 0;
1172
1173 if (ca->mi.state == new_state)
1174 return 0;
1175
1176 if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1177 return -EINVAL;
1178
1179 if (new_state != BCH_MEMBER_STATE_RW)
1180 __bch2_dev_read_only(c, ca);
1181
1182 bch_notice(ca, "%s", bch2_dev_state[new_state]);
1183
1184 mutex_lock(&c->sb_lock);
1185 mi = bch2_sb_get_members(c->disk_sb.sb);
1186 SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state);
1187 bch2_write_super(c);
1188 mutex_unlock(&c->sb_lock);
1189
1190 if (new_state == BCH_MEMBER_STATE_RW &&
1191 __bch2_dev_read_write(c, ca))
1192 ret = -ENOMEM;
1193
1194 rebalance_wakeup(c);
1195
1196 return ret;
1197}
1198
1199int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1200 enum bch_member_state new_state, int flags)
1201{
1202 int ret;
1203
1204 mutex_lock(&c->state_lock);
1205 ret = __bch2_dev_set_state(c, ca, new_state, flags);
1206 mutex_unlock(&c->state_lock);
1207
1208 return ret;
1209}
1210
1211/* Device add/removal: */
1212
1213int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1214{
1215 struct bch_sb_field_members *mi;
1216 unsigned dev_idx = ca->dev_idx, data;
1217 int ret = -EINVAL;
1218
1219 mutex_lock(&c->state_lock);
1220
1221 percpu_ref_put(&ca->ref); /* XXX */
1222
1223 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) {
1224 bch_err(ca, "Cannot remove without losing data");
1225 goto err;
1226 }
1227
1228 __bch2_dev_read_only(c, ca);
1229
1230 /*
1231 * XXX: verify that dev_idx is really not in use anymore, anywhere
1232 *
1233 * flag_data_bad() does not check btree pointers
1234 */
1235 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1236 if (ret) {
1237 bch_err(ca, "Remove failed: error %i dropping data", ret);
1238 goto err;
1239 }
1240
1241 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1242 if (ret) {
1243 bch_err(ca, "Remove failed: error %i flushing journal", ret);
1244 goto err;
1245 }
1246
1247 data = bch2_dev_has_data(c, ca);
1248 if (data) {
1249 char data_has_str[100];
319f9ac3
KO		 1250
1251 bch2_string_opt_to_text(&PBUF(data_has_str),
1252 bch2_data_types, data);
1c6fdbd8
KO		 1253 bch_err(ca, "Remove failed, still has data (%s)", data_has_str);
1254 ret = -EBUSY;
1255 goto err;
1256 }
1257
1258 ret = bch2_btree_delete_range(c, BTREE_ID_ALLOC,
1259 POS(ca->dev_idx, 0),
1260 POS(ca->dev_idx + 1, 0),
fc3268c1 1261 NULL);
1c6fdbd8
KO		 1262 if (ret) {
1263 bch_err(ca, "Remove failed, error deleting alloc info");
1264 goto err;
1265 }
1266
1267 /*
1268 * must flush all existing journal entries, they might have
1269 * (overwritten) keys that point to the device we're removing:
1270 */
1271 bch2_journal_flush_all_pins(&c->journal);
1272 ret = bch2_journal_error(&c->journal);
1273 if (ret) {
1274 bch_err(ca, "Remove failed, journal error");
1275 goto err;
1276 }
1277
1278 __bch2_dev_offline(c, ca);
1279
1280 mutex_lock(&c->sb_lock);
1281 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1282 mutex_unlock(&c->sb_lock);
1283
1284 percpu_ref_kill(&ca->ref);
1285 wait_for_completion(&ca->ref_completion);
1286
1287 bch2_dev_free(ca);
1288
1289 /*
1290 * Free this device's slot in the bch_member array - all pointers to
1291 * this device must be gone:
1292 */
1293 mutex_lock(&c->sb_lock);
1294 mi = bch2_sb_get_members(c->disk_sb.sb);
1295 memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid));
1296
1297 bch2_write_super(c);
1298
1299 mutex_unlock(&c->sb_lock);
1300 mutex_unlock(&c->state_lock);
1301 return 0;
1302err:
1303 if (ca->mi.state == BCH_MEMBER_STATE_RW)
1304 __bch2_dev_read_write(c, ca);
1305 mutex_unlock(&c->state_lock);
1306 return ret;
1307}
1308
6eac2c2e
KO		 1309static void dev_usage_clear(struct bch_dev *ca)
1310{
1311 struct bucket_array *buckets;
1312 int cpu;
1313
1314 for_each_possible_cpu(cpu) {
1315 struct bch_dev_usage *p =
9ca53b55 1316 per_cpu_ptr(ca->usage[0], cpu);
6eac2c2e
KO		 1317 memset(p, 0, sizeof(*p));
1318 }
1319
1320 down_read(&ca->bucket_lock);
1321 buckets = bucket_array(ca);
1322
1323 memset(buckets->b, 0, sizeof(buckets->b[0]) * buckets->nbuckets);
1324 up_read(&ca->bucket_lock);
1325}
1326
1c6fdbd8
KO		 1327/* Add new device to running filesystem: */
1328int bch2_dev_add(struct bch_fs *c, const char *path)
1329{
1330 struct bch_opts opts = bch2_opts_empty();
1331 struct bch_sb_handle sb;
1332 const char *err;
1333 struct bch_dev *ca = NULL;
1334 struct bch_sb_field_members *mi;
1335 struct bch_member dev_mi;
1336 unsigned dev_idx, nr_devices, u64s;
1337 int ret;
1338
1339 ret = bch2_read_super(path, &opts, &sb);
1340 if (ret)
1341 return ret;
1342
1343 err = bch2_sb_validate(&sb);
1344 if (err)
1345 return -EINVAL;
1346
1347 dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx];
1348
1349 err = bch2_dev_may_add(sb.sb, c);
1350 if (err)
1351 return -EINVAL;
1352
1353 ca = __bch2_dev_alloc(c, &dev_mi);
1354 if (!ca) {
1355 bch2_free_super(&sb);
1356 return -ENOMEM;
1357 }
1358
1359 ret = __bch2_dev_attach_bdev(ca, &sb);
1360 if (ret) {
1361 bch2_dev_free(ca);
1362 return ret;
1363 }
1364
6eac2c2e
KO		 1365 /*
1366 * We want to allocate journal on the new device before adding the new
1367 * device to the filesystem because allocating after we attach requires
1368 * spinning up the allocator thread, and the allocator thread requires
1369 * doing btree writes, which if the existing devices are RO isn't going
1370 * to work
1371 *
1372 * So we have to mark where the superblocks are, but marking allocated
1373 * data normally updates the filesystem usage too, so we have to mark,
1374 * allocate the journal, reset all the marks, then remark after we
1375 * attach...
1376 */
9ca53b55 1377 bch2_mark_dev_superblock(ca->fs, ca, 0);
6eac2c2e 1378
1c6fdbd8
KO		 1379 err = "journal alloc failed";
1380 ret = bch2_dev_journal_alloc(ca);
1381 if (ret)
1382 goto err;
1383
6eac2c2e
KO		 1384 dev_usage_clear(ca);
1385
1c6fdbd8
KO		 1386 mutex_lock(&c->state_lock);
1387 mutex_lock(&c->sb_lock);
1388
1389 err = "insufficient space in new superblock";
1390 ret = bch2_sb_from_fs(c, ca);
1391 if (ret)
1392 goto err_unlock;
1393
1394 mi = bch2_sb_get_members(ca->disk_sb.sb);
1395
1396 if (!bch2_sb_resize_members(&ca->disk_sb,
1397 le32_to_cpu(mi->field.u64s) +
1398 sizeof(dev_mi) / sizeof(u64))) {
1399 ret = -ENOSPC;
1400 goto err_unlock;
1401 }
1402
1403 if (dynamic_fault("bcachefs:add:no_slot"))
1404 goto no_slot;
1405
1406 mi = bch2_sb_get_members(c->disk_sb.sb);
1407 for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1408 if (!bch2_dev_exists(c->disk_sb.sb, mi, dev_idx))
1409 goto have_slot;
1410no_slot:
1411 err = "no slots available in superblock";
1412 ret = -ENOSPC;
1413 goto err_unlock;
1414
1415have_slot:
1416 nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1417 u64s = (sizeof(struct bch_sb_field_members) +
1418 sizeof(struct bch_member) * nr_devices) / sizeof(u64);
1419
1420 err = "no space in superblock for member info";
1421 ret = -ENOSPC;
1422
1423 mi = bch2_sb_resize_members(&c->disk_sb, u64s);
1424 if (!mi)
1425 goto err_unlock;
1426
1427 /* success: */
1428
1429 mi->members[dev_idx] = dev_mi;
a420eea6 1430 mi->members[dev_idx].last_mount = cpu_to_le64(ktime_get_real_seconds());
1c6fdbd8
KO		 1431 c->disk_sb.sb->nr_devices = nr_devices;
1432
1433 ca->disk_sb.sb->dev_idx = dev_idx;
1434 bch2_dev_attach(c, ca, dev_idx);
1435
9ca53b55 1436 bch2_mark_dev_superblock(c, ca, 0);
6eac2c2e 1437
1c6fdbd8
KO		 1438 bch2_write_super(c);
1439 mutex_unlock(&c->sb_lock);
1440
1441 if (ca->mi.state == BCH_MEMBER_STATE_RW) {
1442 err = __bch2_dev_read_write(c, ca);
1443 if (err)
1444 goto err_late;
1445 }
1446
1447 mutex_unlock(&c->state_lock);
1448 return 0;
1449
1450err_unlock:
1451 mutex_unlock(&c->sb_lock);
1452 mutex_unlock(&c->state_lock);
1453err:
1454 if (ca)
1455 bch2_dev_free(ca);
1456 bch2_free_super(&sb);
1457 bch_err(c, "Unable to add device: %s", err);
1458 return ret;
1459err_late:
1460 bch_err(c, "Error going rw after adding device: %s", err);
1461 return -EINVAL;
1462}
1463
1464/* Hot add existing device to running filesystem: */
1465int bch2_dev_online(struct bch_fs *c, const char *path)
1466{
1467 struct bch_opts opts = bch2_opts_empty();
1468 struct bch_sb_handle sb = { NULL };
1469 struct bch_sb_field_members *mi;
1470 struct bch_dev *ca;
1471 unsigned dev_idx;
1472 const char *err;
1473 int ret;
1474
1475 mutex_lock(&c->state_lock);
1476
1477 ret = bch2_read_super(path, &opts, &sb);
1478 if (ret) {
1479 mutex_unlock(&c->state_lock);
1480 return ret;
1481 }
1482
1483 dev_idx = sb.sb->dev_idx;
1484
1485 err = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
1486 if (err)
1487 goto err;
1488
1489 if (bch2_dev_attach_bdev(c, &sb)) {
1490 err = "bch2_dev_attach_bdev() error";
1491 goto err;
1492 }
1493
1494 ca = bch_dev_locked(c, dev_idx);
1495 if (ca->mi.state == BCH_MEMBER_STATE_RW) {
1496 err = __bch2_dev_read_write(c, ca);
1497 if (err)
1498 goto err;
1499 }
1500
1501 mutex_lock(&c->sb_lock);
1502 mi = bch2_sb_get_members(c->disk_sb.sb);
1503
1504 mi->members[ca->dev_idx].last_mount =
a420eea6 1505 cpu_to_le64(ktime_get_real_seconds());
1c6fdbd8
KO		 1506
1507 bch2_write_super(c);
1508 mutex_unlock(&c->sb_lock);
1509
1510 mutex_unlock(&c->state_lock);
1511 return 0;
1512err:
1513 mutex_unlock(&c->state_lock);
1514 bch2_free_super(&sb);
1515 bch_err(c, "error bringing %s online: %s", path, err);
1516 return -EINVAL;
1517}
1518
1519int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1520{
1521 mutex_lock(&c->state_lock);
1522
1523 if (!bch2_dev_is_online(ca)) {
1524 bch_err(ca, "Already offline");
1525 mutex_unlock(&c->state_lock);
1526 return 0;
1527 }
1528
1529 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) {
1530 bch_err(ca, "Cannot offline required disk");
1531 mutex_unlock(&c->state_lock);
1532 return -EINVAL;
1533 }
1534
1535 __bch2_dev_offline(c, ca);
1536
1537 mutex_unlock(&c->state_lock);
1538 return 0;
1539}
1540
1541int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1542{
1543 struct bch_member *mi;
1544 int ret = 0;
1545
1546 mutex_lock(&c->state_lock);
1547
1548 if (nbuckets < ca->mi.nbuckets) {
1549 bch_err(ca, "Cannot shrink yet");
1550 ret = -EINVAL;
1551 goto err;
1552 }
1553
1554 if (bch2_dev_is_online(ca) &&
1555 get_capacity(ca->disk_sb.bdev->bd_disk) <
1556 ca->mi.bucket_size * nbuckets) {
1557 bch_err(ca, "New size larger than device");
1558 ret = -EINVAL;
1559 goto err;
1560 }
1561
1562 ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1563 if (ret) {
1564 bch_err(ca, "Resize error: %i", ret);
1565 goto err;
1566 }
1567
1568 mutex_lock(&c->sb_lock);
1569 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
1570 mi->nbuckets = cpu_to_le64(nbuckets);
1571
1572 bch2_write_super(c);
1573 mutex_unlock(&c->sb_lock);
1574
1575 bch2_recalc_capacity(c);
1576err:
1577 mutex_unlock(&c->state_lock);
1578 return ret;
1579}
1580
1581/* return with ref on ca->ref: */
1582struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *path)
1583{
1584
1585 struct bch_dev *ca;
1586 dev_t dev;
1587 unsigned i;
1588 int ret;
1589
1590 ret = lookup_bdev(path, &dev);
1591 if (ret)
1592 return ERR_PTR(ret);
1593
1594 for_each_member_device(ca, c, i)
1595 if (ca->disk_sb.bdev->bd_dev == dev)
1596 goto found;
1597
1598 ca = ERR_PTR(-ENOENT);
1599found:
1600 return ca;
1601}
1602
1603/* Filesystem open: */
1604
1605struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
1606 struct bch_opts opts)
1607{
1608 struct bch_sb_handle *sb = NULL;
1609 struct bch_fs *c = NULL;
1610 unsigned i, best_sb = 0;
1611 const char *err;
1612 int ret = -ENOMEM;
1613
1614 pr_verbose_init(opts, "");
1615
1616 if (!nr_devices) {
1617 c = ERR_PTR(-EINVAL);
1618 goto out2;
1619 }
1620
1621 if (!try_module_get(THIS_MODULE)) {
1622 c = ERR_PTR(-ENODEV);
1623 goto out2;
1624 }
1625
1626 sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1627 if (!sb)
1628 goto err;
1629
1630 for (i = 0; i < nr_devices; i++) {
1631 ret = bch2_read_super(devices[i], &opts, &sb[i]);
1632 if (ret)
1633 goto err;
1634
1635 err = bch2_sb_validate(&sb[i]);
1636 if (err)
1637 goto err_print;
1638 }
1639
1640 for (i = 1; i < nr_devices; i++)
1641 if (le64_to_cpu(sb[i].sb->seq) >
1642 le64_to_cpu(sb[best_sb].sb->seq))
1643 best_sb = i;
1644
1645 for (i = 0; i < nr_devices; i++) {
1646 err = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1647 if (err)
1648 goto err_print;
1649 }
1650
1651 ret = -ENOMEM;
1652 c = bch2_fs_alloc(sb[best_sb].sb, opts);
1653 if (!c)
1654 goto err;
1655
1656 err = "bch2_dev_online() error";
1657 mutex_lock(&c->state_lock);
1658 for (i = 0; i < nr_devices; i++)
1659 if (bch2_dev_attach_bdev(c, &sb[i])) {
1660 mutex_unlock(&c->state_lock);
1661 goto err_print;
1662 }
1663 mutex_unlock(&c->state_lock);
1664
1665 err = "insufficient devices";
1666 if (!bch2_fs_may_start(c))
1667 goto err_print;
1668
1669 if (!c->opts.nostart) {
1670 err = bch2_fs_start(c);
1671 if (err)
1672 goto err_print;
1673 }
1674out:
1675 kfree(sb);
1676 module_put(THIS_MODULE);
1677out2:
1678 pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
1679 return c;
1680err_print:
1681 pr_err("bch_fs_open err opening %s: %s",
1682 devices[0], err);
1683 ret = -EINVAL;
1684err:
1685 if (c)
1686 bch2_fs_stop(c);
1687 for (i = 0; i < nr_devices; i++)
1688 bch2_free_super(&sb[i]);
1689 c = ERR_PTR(ret);
1690 goto out;
1691}
1692
1693static const char *__bch2_fs_open_incremental(struct bch_sb_handle *sb,
1694 struct bch_opts opts)
1695{
1696 const char *err;
1697 struct bch_fs *c;
1698 bool allocated_fs = false;
1699
1700 err = bch2_sb_validate(sb);
1701 if (err)
1702 return err;
1703
1704 mutex_lock(&bch_fs_list_lock);
1705 c = __bch2_uuid_to_fs(sb->sb->uuid);
1706 if (c) {
1707 closure_get(&c->cl);
1708
1709 err = bch2_dev_in_fs(c->disk_sb.sb, sb->sb);
1710 if (err)
1711 goto err;
1712 } else {
1713 c = bch2_fs_alloc(sb->sb, opts);
1714 err = "cannot allocate memory";
1715 if (!c)
1716 goto err;
1717
1718 allocated_fs = true;
1719 }
1720
1721 err = "bch2_dev_online() error";
1722
1723 mutex_lock(&c->sb_lock);
1724 if (bch2_dev_attach_bdev(c, sb)) {
1725 mutex_unlock(&c->sb_lock);
1726 goto err;
1727 }
1728 mutex_unlock(&c->sb_lock);
1729
1730 if (!c->opts.nostart && bch2_fs_may_start(c)) {
1731 err = bch2_fs_start(c);
1732 if (err)
1733 goto err;
1734 }
1735
1736 closure_put(&c->cl);
1737 mutex_unlock(&bch_fs_list_lock);
1738
1739 return NULL;
1740err:
1741 mutex_unlock(&bch_fs_list_lock);
1742
1743 if (allocated_fs)
1744 bch2_fs_stop(c);
1745 else if (c)
1746 closure_put(&c->cl);
1747
1748 return err;
1749}
1750
1751const char *bch2_fs_open_incremental(const char *path)
1752{
1753 struct bch_sb_handle sb;
1754 struct bch_opts opts = bch2_opts_empty();
1755 const char *err;
1756
1757 if (bch2_read_super(path, &opts, &sb))
1758 return "error reading superblock";
1759
1760 err = __bch2_fs_open_incremental(&sb, opts);
1761 bch2_free_super(&sb);
1762
1763 return err;
1764}
1765
1766/* Global interfaces/init */
1767
1768static void bcachefs_exit(void)
1769{
1770 bch2_debug_exit();
1771 bch2_vfs_exit();
1772 bch2_chardev_exit();
1773 if (bcachefs_kset)
1774 kset_unregister(bcachefs_kset);
1775}
1776
1777static int __init bcachefs_init(void)
1778{
1779 bch2_bkey_pack_test();
1780 bch2_inode_pack_test();
1781
1782 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
1783 bch2_chardev_init() ||
1784 bch2_vfs_init() ||
1785 bch2_debug_init())
1786 goto err;
1787
1788 return 0;
1789err:
1790 bcachefs_exit();
1791 return -ENOMEM;
1792}
1793
1794#define BCH_DEBUG_PARAM(name, description) \
1795 bool bch2_##name; \
1796 module_param_named(name, bch2_##name, bool, 0644); \
1797 MODULE_PARM_DESC(name, description);
1798BCH_DEBUG_PARAMS()
1799#undef BCH_DEBUG_PARAM
1800
1801unsigned bch2_metadata_version = BCH_SB_VERSION_MAX;
1802module_param_named(version, bch2_metadata_version, uint, 0400);
1803
1804module_exit(bcachefs_exit);
1805module_init(bcachefs_init);
Linux 6.x block layer and io_uring tree(s)