2149 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * bcachefs setup/teardown code, and some metadata io - read a superblock and4 * 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 75MODULE_LICENSE("GPL");76MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");77MODULE_DESCRIPTION("bcachefs filesystem");78MODULE_SOFTDEP("pre: crc32c");79MODULE_SOFTDEP("pre: crc64");80MODULE_SOFTDEP("pre: sha256");81MODULE_SOFTDEP("pre: chacha20");82MODULE_SOFTDEP("pre: poly1305");83MODULE_SOFTDEP("pre: xxhash");84 85const char * const bch2_fs_flag_strs[] = {86#define x(n) #n,87 BCH_FS_FLAGS()88#undef x89 NULL90};91 92void 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#endif102 bch2_print_string_as_lines(KERN_ERR, str);103}104 105__printf(2, 0)106static 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#endif117 vprintk(fmt, args);118}119 120void 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 130void __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) \141static const struct attribute_group type ## _group = { \142 .attrs = type ## _files \143}; \144 \145static const struct attribute_group *type ## _groups[] = { \146 &type ## _group, \147 NULL \148}; \149 \150static const struct kobj_type type ## _ktype = { \151 .release = type ## _release, \152 .sysfs_ops = &type ## _sysfs_ops, \153 .default_groups = type ## _groups \154}155 156static void bch2_fs_release(struct kobject *);157static void bch2_dev_release(struct kobject *);158static void bch2_fs_counters_release(struct kobject *k)159{160}161 162static void bch2_fs_internal_release(struct kobject *k)163{164}165 166static void bch2_fs_opts_dir_release(struct kobject *k)167{168}169 170static void bch2_fs_time_stats_release(struct kobject *k)171{172}173 174KTYPE(bch2_fs);175KTYPE(bch2_fs_counters);176KTYPE(bch2_fs_internal);177KTYPE(bch2_fs_opts_dir);178KTYPE(bch2_fs_time_stats);179KTYPE(bch2_dev);180 181static struct kset *bcachefs_kset;182static LIST_HEAD(bch_fs_list);183static DEFINE_MUTEX(bch_fs_list_lock);184 185DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);186 187static void bch2_dev_unlink(struct bch_dev *);188static void bch2_dev_free(struct bch_dev *);189static int bch2_dev_alloc(struct bch_fs *, unsigned);190static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);191static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);192 193struct bch_fs *bch2_dev_to_fs(dev_t dev)194{195 struct bch_fs *c;196 197 mutex_lock(&bch_fs_list_lock);198 rcu_read_lock();199 200 list_for_each_entry(c, &bch_fs_list, list)201 for_each_member_device_rcu(c, ca, NULL)202 if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {203 closure_get(&c->cl);204 goto found;205 }206 c = NULL;207found:208 rcu_read_unlock();209 mutex_unlock(&bch_fs_list_lock);210 211 return c;212}213 214static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)215{216 struct bch_fs *c;217 218 lockdep_assert_held(&bch_fs_list_lock);219 220 list_for_each_entry(c, &bch_fs_list, list)221 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))222 return c;223 224 return NULL;225}226 227struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)228{229 struct bch_fs *c;230 231 mutex_lock(&bch_fs_list_lock);232 c = __bch2_uuid_to_fs(uuid);233 if (c)234 closure_get(&c->cl);235 mutex_unlock(&bch_fs_list_lock);236 237 return c;238}239 240/* Filesystem RO/RW: */241 242/*243 * For startup/shutdown of RW stuff, the dependencies are:244 *245 * - foreground writes depend on copygc and rebalance (to free up space)246 *247 * - copygc and rebalance depend on mark and sweep gc (they actually probably248 * don't because they either reserve ahead of time or don't block if249 * allocations fail, but allocations can require mark and sweep gc to run250 * because of generation number wraparound)251 *252 * - all of the above depends on the allocator threads253 *254 * - allocator depends on the journal (when it rewrites prios and gens)255 */256 257static void __bch2_fs_read_only(struct bch_fs *c)258{259 unsigned clean_passes = 0;260 u64 seq = 0;261 262 bch2_fs_ec_stop(c);263 bch2_open_buckets_stop(c, NULL, true);264 bch2_rebalance_stop(c);265 bch2_copygc_stop(c);266 bch2_fs_ec_flush(c);267 268 bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",269 journal_cur_seq(&c->journal));270 271 do {272 clean_passes++;273 274 if (bch2_btree_interior_updates_flush(c) ||275 bch2_btree_write_buffer_flush_going_ro(c) ||276 bch2_journal_flush_all_pins(&c->journal) ||277 bch2_btree_flush_all_writes(c) ||278 seq != atomic64_read(&c->journal.seq)) {279 seq = atomic64_read(&c->journal.seq);280 clean_passes = 0;281 }282 } while (clean_passes < 2);283 284 bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu",285 journal_cur_seq(&c->journal));286 287 if (test_bit(JOURNAL_replay_done, &c->journal.flags) &&288 !test_bit(BCH_FS_emergency_ro, &c->flags))289 set_bit(BCH_FS_clean_shutdown, &c->flags);290 291 bch2_fs_journal_stop(&c->journal);292 293 bch_info(c, "%sshutdown complete, journal seq %llu",294 test_bit(BCH_FS_clean_shutdown, &c->flags) ? "" : "un",295 c->journal.seq_ondisk);296 297 /*298 * After stopping journal:299 */300 for_each_member_device(c, ca)301 bch2_dev_allocator_remove(c, ca);302}303 304#ifndef BCH_WRITE_REF_DEBUG305static void bch2_writes_disabled(struct percpu_ref *writes)306{307 struct bch_fs *c = container_of(writes, struct bch_fs, writes);308 309 set_bit(BCH_FS_write_disable_complete, &c->flags);310 wake_up(&bch2_read_only_wait);311}312#endif313 314void bch2_fs_read_only(struct bch_fs *c)315{316 if (!test_bit(BCH_FS_rw, &c->flags)) {317 bch2_journal_reclaim_stop(&c->journal);318 return;319 }320 321 BUG_ON(test_bit(BCH_FS_write_disable_complete, &c->flags));322 323 bch_verbose(c, "going read-only");324 325 /*326 * Block new foreground-end write operations from starting - any new327 * writes will return -EROFS:328 */329 set_bit(BCH_FS_going_ro, &c->flags);330#ifndef BCH_WRITE_REF_DEBUG331 percpu_ref_kill(&c->writes);332#else333 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)334 bch2_write_ref_put(c, i);335#endif336 337 /*338 * If we're not doing an emergency shutdown, we want to wait on339 * outstanding writes to complete so they don't see spurious errors due340 * to shutting down the allocator:341 *342 * If we are doing an emergency shutdown outstanding writes may343 * hang until we shutdown the allocator so we don't want to wait344 * on outstanding writes before shutting everything down - but345 * we do need to wait on them before returning and signalling346 * that going RO is complete:347 */348 wait_event(bch2_read_only_wait,349 test_bit(BCH_FS_write_disable_complete, &c->flags) ||350 test_bit(BCH_FS_emergency_ro, &c->flags));351 352 bool writes_disabled = test_bit(BCH_FS_write_disable_complete, &c->flags);353 if (writes_disabled)354 bch_verbose(c, "finished waiting for writes to stop");355 356 __bch2_fs_read_only(c);357 358 wait_event(bch2_read_only_wait,359 test_bit(BCH_FS_write_disable_complete, &c->flags));360 361 if (!writes_disabled)362 bch_verbose(c, "finished waiting for writes to stop");363 364 clear_bit(BCH_FS_write_disable_complete, &c->flags);365 clear_bit(BCH_FS_going_ro, &c->flags);366 clear_bit(BCH_FS_rw, &c->flags);367 368 if (!bch2_journal_error(&c->journal) &&369 !test_bit(BCH_FS_error, &c->flags) &&370 !test_bit(BCH_FS_emergency_ro, &c->flags) &&371 test_bit(BCH_FS_started, &c->flags) &&372 test_bit(BCH_FS_clean_shutdown, &c->flags) &&373 c->recovery_pass_done >= BCH_RECOVERY_PASS_journal_replay) {374 BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal));375 BUG_ON(atomic_long_read(&c->btree_cache.nr_dirty));376 BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty));377 BUG_ON(c->btree_write_buffer.inc.keys.nr);378 BUG_ON(c->btree_write_buffer.flushing.keys.nr);379 bch2_verify_accounting_clean(c);380 381 bch_verbose(c, "marking filesystem clean");382 bch2_fs_mark_clean(c);383 } else {384 bch_verbose(c, "done going read-only, filesystem not clean");385 }386}387 388static void bch2_fs_read_only_work(struct work_struct *work)389{390 struct bch_fs *c =391 container_of(work, struct bch_fs, read_only_work);392 393 down_write(&c->state_lock);394 bch2_fs_read_only(c);395 up_write(&c->state_lock);396}397 398static void bch2_fs_read_only_async(struct bch_fs *c)399{400 queue_work(system_long_wq, &c->read_only_work);401}402 403bool bch2_fs_emergency_read_only(struct bch_fs *c)404{405 bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags);406 407 bch2_journal_halt(&c->journal);408 bch2_fs_read_only_async(c);409 410 wake_up(&bch2_read_only_wait);411 return ret;412}413 414static int bch2_fs_read_write_late(struct bch_fs *c)415{416 int ret;417 418 /*419 * Data move operations can't run until after check_snapshots has420 * completed, and bch2_snapshot_is_ancestor() is available.421 *422 * Ideally we'd start copygc/rebalance earlier instead of waiting for423 * all of recovery/fsck to complete:424 */425 ret = bch2_copygc_start(c);426 if (ret) {427 bch_err(c, "error starting copygc thread");428 return ret;429 }430 431 ret = bch2_rebalance_start(c);432 if (ret) {433 bch_err(c, "error starting rebalance thread");434 return ret;435 }436 437 return 0;438}439 440static int __bch2_fs_read_write(struct bch_fs *c, bool early)441{442 int ret;443 444 if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) {445 bch_err(c, "cannot go rw, unfixed btree errors");446 return -BCH_ERR_erofs_unfixed_errors;447 }448 449 if (test_bit(BCH_FS_rw, &c->flags))450 return 0;451 452 bch_info(c, "going read-write");453 454 ret = bch2_sb_members_v2_init(c);455 if (ret)456 goto err;457 458 ret = bch2_fs_mark_dirty(c);459 if (ret)460 goto err;461 462 clear_bit(BCH_FS_clean_shutdown, &c->flags);463 464 /*465 * First journal write must be a flush write: after a clean shutdown we466 * don't read the journal, so the first journal write may end up467 * overwriting whatever was there previously, and there must always be468 * at least one non-flush write in the journal or recovery will fail:469 */470 set_bit(JOURNAL_need_flush_write, &c->journal.flags);471 set_bit(JOURNAL_running, &c->journal.flags);472 473 for_each_rw_member(c, ca)474 bch2_dev_allocator_add(c, ca);475 bch2_recalc_capacity(c);476 477 set_bit(BCH_FS_rw, &c->flags);478 set_bit(BCH_FS_was_rw, &c->flags);479 480#ifndef BCH_WRITE_REF_DEBUG481 percpu_ref_reinit(&c->writes);482#else483 for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) {484 BUG_ON(atomic_long_read(&c->writes[i]));485 atomic_long_inc(&c->writes[i]);486 }487#endif488 489 ret = bch2_journal_reclaim_start(&c->journal);490 if (ret)491 goto err;492 493 if (!early) {494 ret = bch2_fs_read_write_late(c);495 if (ret)496 goto err;497 }498 499 bch2_do_discards(c);500 bch2_do_invalidates(c);501 bch2_do_stripe_deletes(c);502 bch2_do_pending_node_rewrites(c);503 return 0;504err:505 if (test_bit(BCH_FS_rw, &c->flags))506 bch2_fs_read_only(c);507 else508 __bch2_fs_read_only(c);509 return ret;510}511 512int bch2_fs_read_write(struct bch_fs *c)513{514 if (c->opts.recovery_pass_last &&515 c->opts.recovery_pass_last < BCH_RECOVERY_PASS_journal_replay)516 return -BCH_ERR_erofs_norecovery;517 518 if (c->opts.nochanges)519 return -BCH_ERR_erofs_nochanges;520 521 return __bch2_fs_read_write(c, false);522}523 524int bch2_fs_read_write_early(struct bch_fs *c)525{526 lockdep_assert_held(&c->state_lock);527 528 return __bch2_fs_read_write(c, true);529}530 531/* Filesystem startup/shutdown: */532 533static void __bch2_fs_free(struct bch_fs *c)534{535 for (unsigned i = 0; i < BCH_TIME_STAT_NR; i++)536 bch2_time_stats_exit(&c->times[i]);537 538 bch2_find_btree_nodes_exit(&c->found_btree_nodes);539 bch2_free_pending_node_rewrites(c);540 bch2_fs_accounting_exit(c);541 bch2_fs_sb_errors_exit(c);542 bch2_fs_counters_exit(c);543 bch2_fs_snapshots_exit(c);544 bch2_fs_quota_exit(c);545 bch2_fs_fs_io_direct_exit(c);546 bch2_fs_fs_io_buffered_exit(c);547 bch2_fs_fsio_exit(c);548 bch2_fs_vfs_exit(c);549 bch2_fs_ec_exit(c);550 bch2_fs_encryption_exit(c);551 bch2_fs_nocow_locking_exit(c);552 bch2_fs_io_write_exit(c);553 bch2_fs_io_read_exit(c);554 bch2_fs_buckets_waiting_for_journal_exit(c);555 bch2_fs_btree_interior_update_exit(c);556 bch2_fs_btree_key_cache_exit(&c->btree_key_cache);557 bch2_fs_btree_cache_exit(c);558 bch2_fs_btree_iter_exit(c);559 bch2_fs_replicas_exit(c);560 bch2_fs_journal_exit(&c->journal);561 bch2_io_clock_exit(&c->io_clock[WRITE]);562 bch2_io_clock_exit(&c->io_clock[READ]);563 bch2_fs_compress_exit(c);564 bch2_journal_keys_put_initial(c);565 bch2_find_btree_nodes_exit(&c->found_btree_nodes);566 BUG_ON(atomic_read(&c->journal_keys.ref));567 bch2_fs_btree_write_buffer_exit(c);568 percpu_free_rwsem(&c->mark_lock);569 if (c->online_reserved) {570 u64 v = percpu_u64_get(c->online_reserved);571 WARN(v, "online_reserved not 0 at shutdown: %lli", v);572 free_percpu(c->online_reserved);573 }574 575 darray_exit(&c->btree_roots_extra);576 free_percpu(c->pcpu);577 free_percpu(c->usage);578 mempool_exit(&c->large_bkey_pool);579 mempool_exit(&c->btree_bounce_pool);580 bioset_exit(&c->btree_bio);581 mempool_exit(&c->fill_iter);582#ifndef BCH_WRITE_REF_DEBUG583 percpu_ref_exit(&c->writes);584#endif585 kfree(rcu_dereference_protected(c->disk_groups, 1));586 kfree(c->journal_seq_blacklist_table);587 kfree(c->unused_inode_hints);588 589 if (c->write_ref_wq)590 destroy_workqueue(c->write_ref_wq);591 if (c->btree_write_submit_wq)592 destroy_workqueue(c->btree_write_submit_wq);593 if (c->btree_read_complete_wq)594 destroy_workqueue(c->btree_read_complete_wq);595 if (c->copygc_wq)596 destroy_workqueue(c->copygc_wq);597 if (c->btree_io_complete_wq)598 destroy_workqueue(c->btree_io_complete_wq);599 if (c->btree_update_wq)600 destroy_workqueue(c->btree_update_wq);601 602 bch2_free_super(&c->disk_sb);603 kvfree(c);604 module_put(THIS_MODULE);605}606 607static void bch2_fs_release(struct kobject *kobj)608{609 struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);610 611 __bch2_fs_free(c);612}613 614void __bch2_fs_stop(struct bch_fs *c)615{616 bch_verbose(c, "shutting down");617 618 set_bit(BCH_FS_stopping, &c->flags);619 620 down_write(&c->state_lock);621 bch2_fs_read_only(c);622 up_write(&c->state_lock);623 624 for_each_member_device(c, ca)625 bch2_dev_unlink(ca);626 627 if (c->kobj.state_in_sysfs)628 kobject_del(&c->kobj);629 630 bch2_fs_debug_exit(c);631 bch2_fs_chardev_exit(c);632 633 bch2_ro_ref_put(c);634 wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref));635 636 kobject_put(&c->counters_kobj);637 kobject_put(&c->time_stats);638 kobject_put(&c->opts_dir);639 kobject_put(&c->internal);640 641 /* btree prefetch might have kicked off reads in the background: */642 bch2_btree_flush_all_reads(c);643 644 for_each_member_device(c, ca)645 cancel_work_sync(&ca->io_error_work);646 647 cancel_work_sync(&c->read_only_work);648}649 650void bch2_fs_free(struct bch_fs *c)651{652 unsigned i;653 654 mutex_lock(&bch_fs_list_lock);655 list_del(&c->list);656 mutex_unlock(&bch_fs_list_lock);657 658 closure_sync(&c->cl);659 closure_debug_destroy(&c->cl);660 661 for (i = 0; i < c->sb.nr_devices; i++) {662 struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true);663 664 if (ca) {665 EBUG_ON(atomic_long_read(&ca->ref) != 1);666 bch2_free_super(&ca->disk_sb);667 bch2_dev_free(ca);668 }669 }670 671 bch_verbose(c, "shutdown complete");672 673 kobject_put(&c->kobj);674}675 676void bch2_fs_stop(struct bch_fs *c)677{678 __bch2_fs_stop(c);679 bch2_fs_free(c);680}681 682static int bch2_fs_online(struct bch_fs *c)683{684 int ret = 0;685 686 lockdep_assert_held(&bch_fs_list_lock);687 688 if (__bch2_uuid_to_fs(c->sb.uuid)) {689 bch_err(c, "filesystem UUID already open");690 return -EINVAL;691 }692 693 ret = bch2_fs_chardev_init(c);694 if (ret) {695 bch_err(c, "error creating character device");696 return ret;697 }698 699 bch2_fs_debug_init(c);700 701 ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:702 kobject_add(&c->internal, &c->kobj, "internal") ?:703 kobject_add(&c->opts_dir, &c->kobj, "options") ?:704#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT705 kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:706#endif707 kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:708 bch2_opts_create_sysfs_files(&c->opts_dir);709 if (ret) {710 bch_err(c, "error creating sysfs objects");711 return ret;712 }713 714 down_write(&c->state_lock);715 716 for_each_member_device(c, ca) {717 ret = bch2_dev_sysfs_online(c, ca);718 if (ret) {719 bch_err(c, "error creating sysfs objects");720 bch2_dev_put(ca);721 goto err;722 }723 }724 725 BUG_ON(!list_empty(&c->list));726 list_add(&c->list, &bch_fs_list);727err:728 up_write(&c->state_lock);729 return ret;730}731 732static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)733{734 struct bch_fs *c;735 struct printbuf name = PRINTBUF;736 unsigned i, iter_size;737 int ret = 0;738 739 c = kvmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);740 if (!c) {741 c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc);742 goto out;743 }744 745 c->stdio = (void *)(unsigned long) opts.stdio;746 747 __module_get(THIS_MODULE);748 749 closure_init(&c->cl, NULL);750 751 c->kobj.kset = bcachefs_kset;752 kobject_init(&c->kobj, &bch2_fs_ktype);753 kobject_init(&c->internal, &bch2_fs_internal_ktype);754 kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);755 kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);756 kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);757 758 c->minor = -1;759 c->disk_sb.fs_sb = true;760 761 init_rwsem(&c->state_lock);762 mutex_init(&c->sb_lock);763 mutex_init(&c->replicas_gc_lock);764 mutex_init(&c->btree_root_lock);765 INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);766 767 refcount_set(&c->ro_ref, 1);768 init_waitqueue_head(&c->ro_ref_wait);769 sema_init(&c->online_fsck_mutex, 1);770 771 init_rwsem(&c->gc_lock);772 mutex_init(&c->gc_gens_lock);773 atomic_set(&c->journal_keys.ref, 1);774 c->journal_keys.initial_ref_held = true;775 776 for (i = 0; i < BCH_TIME_STAT_NR; i++)777 bch2_time_stats_init(&c->times[i]);778 779 bch2_fs_gc_init(c);780 bch2_fs_copygc_init(c);781 bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);782 bch2_fs_btree_iter_init_early(c);783 bch2_fs_btree_interior_update_init_early(c);784 bch2_fs_allocator_background_init(c);785 bch2_fs_allocator_foreground_init(c);786 bch2_fs_rebalance_init(c);787 bch2_fs_quota_init(c);788 bch2_fs_ec_init_early(c);789 bch2_fs_move_init(c);790 bch2_fs_sb_errors_init_early(c);791 792 INIT_LIST_HEAD(&c->list);793 794 mutex_init(&c->bio_bounce_pages_lock);795 mutex_init(&c->snapshot_table_lock);796 init_rwsem(&c->snapshot_create_lock);797 798 spin_lock_init(&c->btree_write_error_lock);799 800 INIT_LIST_HEAD(&c->journal_iters);801 802 INIT_LIST_HEAD(&c->fsck_error_msgs);803 mutex_init(&c->fsck_error_msgs_lock);804 805 seqcount_init(&c->usage_lock);806 807 sema_init(&c->io_in_flight, 128);808 809 INIT_LIST_HEAD(&c->vfs_inodes_list);810 mutex_init(&c->vfs_inodes_lock);811 812 c->copy_gc_enabled = 1;813 c->rebalance.enabled = 1;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_DEBUG891 percpu_ref_init(&c->writes, bch2_writes_disabled,892 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||893#endif894 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_vfs_init(c) ?:930 bch2_fs_fsio_init(c) ?:931 bch2_fs_fs_io_buffered_init(c) ?:932 bch2_fs_fs_io_direct_init(c);933 if (ret)934 goto err;935 936 for (i = 0; i < c->sb.nr_devices; i++) {937 if (!bch2_member_exists(c->disk_sb.sb, i))938 continue;939 ret = bch2_dev_alloc(c, i);940 if (ret)941 goto err;942 }943 944 bch2_journal_entry_res_resize(&c->journal,945 &c->btree_root_journal_res,946 BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));947 bch2_journal_entry_res_resize(&c->journal,948 &c->clock_journal_res,949 (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);950 951 mutex_lock(&bch_fs_list_lock);952 ret = bch2_fs_online(c);953 mutex_unlock(&bch_fs_list_lock);954 955 if (ret)956 goto err;957out:958 return c;959err:960 bch2_fs_free(c);961 c = ERR_PTR(ret);962 goto out;963}964 965noinline_for_stack966static void print_mount_opts(struct bch_fs *c)967{968 enum bch_opt_id i;969 struct printbuf p = PRINTBUF;970 bool first = true;971 972 prt_str(&p, "starting version ");973 bch2_version_to_text(&p, c->sb.version);974 975 if (c->opts.read_only) {976 prt_str(&p, " opts=");977 first = false;978 prt_printf(&p, "ro");979 }980 981 for (i = 0; i < bch2_opts_nr; i++) {982 const struct bch_option *opt = &bch2_opt_table[i];983 u64 v = bch2_opt_get_by_id(&c->opts, i);984 985 if (!(opt->flags & OPT_MOUNT))986 continue;987 988 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))989 continue;990 991 prt_str(&p, first ? " opts=" : ",");992 first = false;993 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);994 }995 996 bch_info(c, "%s", p.buf);997 printbuf_exit(&p);998}999 1000int bch2_fs_start(struct bch_fs *c)1001{1002 time64_t now = ktime_get_real_seconds();1003 int ret;1004 1005 print_mount_opts(c);1006 1007 down_write(&c->state_lock);1008 1009 BUG_ON(test_bit(BCH_FS_started, &c->flags));1010 1011 mutex_lock(&c->sb_lock);1012 1013 ret = bch2_sb_members_v2_init(c);1014 if (ret) {1015 mutex_unlock(&c->sb_lock);1016 goto err;1017 }1018 1019 for_each_online_member(c, ca)1020 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = cpu_to_le64(now);1021 1022 struct bch_sb_field_ext *ext =1023 bch2_sb_field_get_minsize(&c->disk_sb, ext, sizeof(*ext) / sizeof(u64));1024 mutex_unlock(&c->sb_lock);1025 1026 if (!ext) {1027 bch_err(c, "insufficient space in superblock for sb_field_ext");1028 ret = -BCH_ERR_ENOSPC_sb;1029 goto err;1030 }1031 1032 for_each_rw_member(c, ca)1033 bch2_dev_allocator_add(c, ca);1034 bch2_recalc_capacity(c);1035 1036 ret = BCH_SB_INITIALIZED(c->disk_sb.sb)1037 ? bch2_fs_recovery(c)1038 : bch2_fs_initialize(c);1039 if (ret)1040 goto err;1041 1042 ret = bch2_opts_check_may_set(c);1043 if (ret)1044 goto err;1045 1046 if (bch2_fs_init_fault("fs_start")) {1047 bch_err(c, "fs_start fault injected");1048 ret = -EINVAL;1049 goto err;1050 }1051 1052 set_bit(BCH_FS_started, &c->flags);1053 1054 if (c->opts.read_only) {1055 bch2_fs_read_only(c);1056 } else {1057 ret = !test_bit(BCH_FS_rw, &c->flags)1058 ? bch2_fs_read_write(c)1059 : bch2_fs_read_write_late(c);1060 if (ret)1061 goto err;1062 }1063 1064 ret = 0;1065err:1066 if (ret)1067 bch_err_msg(c, ret, "starting filesystem");1068 else1069 bch_verbose(c, "done starting filesystem");1070 up_write(&c->state_lock);1071 return ret;1072}1073 1074static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)1075{1076 struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx);1077 1078 if (le16_to_cpu(sb->block_size) != block_sectors(c))1079 return -BCH_ERR_mismatched_block_size;1080 1081 if (le16_to_cpu(m.bucket_size) <1082 BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))1083 return -BCH_ERR_bucket_size_too_small;1084 1085 return 0;1086}1087 1088static int bch2_dev_in_fs(struct bch_sb_handle *fs,1089 struct bch_sb_handle *sb,1090 struct bch_opts *opts)1091{1092 if (fs == sb)1093 return 0;1094 1095 if (!uuid_equal(&fs->sb->uuid, &sb->sb->uuid))1096 return -BCH_ERR_device_not_a_member_of_filesystem;1097 1098 if (!bch2_member_exists(fs->sb, sb->sb->dev_idx))1099 return -BCH_ERR_device_has_been_removed;1100 1101 if (fs->sb->block_size != sb->sb->block_size)1102 return -BCH_ERR_mismatched_block_size;1103 1104 if (le16_to_cpu(fs->sb->version) < bcachefs_metadata_version_member_seq ||1105 le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_member_seq)1106 return 0;1107 1108 if (fs->sb->seq == sb->sb->seq &&1109 fs->sb->write_time != sb->sb->write_time) {1110 struct printbuf buf = PRINTBUF;1111 1112 prt_str(&buf, "Split brain detected between ");1113 prt_bdevname(&buf, sb->bdev);1114 prt_str(&buf, " and ");1115 prt_bdevname(&buf, fs->bdev);1116 prt_char(&buf, ':');1117 prt_newline(&buf);1118 prt_printf(&buf, "seq=%llu but write_time different, got", le64_to_cpu(sb->sb->seq));1119 prt_newline(&buf);1120 1121 prt_bdevname(&buf, fs->bdev);1122 prt_char(&buf, ' ');1123 bch2_prt_datetime(&buf, le64_to_cpu(fs->sb->write_time));;1124 prt_newline(&buf);1125 1126 prt_bdevname(&buf, sb->bdev);1127 prt_char(&buf, ' ');1128 bch2_prt_datetime(&buf, le64_to_cpu(sb->sb->write_time));;1129 prt_newline(&buf);1130 1131 if (!opts->no_splitbrain_check)1132 prt_printf(&buf, "Not using older sb");1133 1134 pr_err("%s", buf.buf);1135 printbuf_exit(&buf);1136 1137 if (!opts->no_splitbrain_check)1138 return -BCH_ERR_device_splitbrain;1139 }1140 1141 struct bch_member m = bch2_sb_member_get(fs->sb, sb->sb->dev_idx);1142 u64 seq_from_fs = le64_to_cpu(m.seq);1143 u64 seq_from_member = le64_to_cpu(sb->sb->seq);1144 1145 if (seq_from_fs && seq_from_fs < seq_from_member) {1146 struct printbuf buf = PRINTBUF;1147 1148 prt_str(&buf, "Split brain detected between ");1149 prt_bdevname(&buf, sb->bdev);1150 prt_str(&buf, " and ");1151 prt_bdevname(&buf, fs->bdev);1152 prt_char(&buf, ':');1153 prt_newline(&buf);1154 1155 prt_bdevname(&buf, fs->bdev);1156 prt_str(&buf, " believes seq of ");1157 prt_bdevname(&buf, sb->bdev);1158 prt_printf(&buf, " to be %llu, but ", seq_from_fs);1159 prt_bdevname(&buf, sb->bdev);1160 prt_printf(&buf, " has %llu\n", seq_from_member);1161 1162 if (!opts->no_splitbrain_check) {1163 prt_str(&buf, "Not using ");1164 prt_bdevname(&buf, sb->bdev);1165 }1166 1167 pr_err("%s", buf.buf);1168 printbuf_exit(&buf);1169 1170 if (!opts->no_splitbrain_check)1171 return -BCH_ERR_device_splitbrain;1172 }1173 1174 return 0;1175}1176 1177/* Device startup/shutdown: */1178 1179static void bch2_dev_release(struct kobject *kobj)1180{1181 struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);1182 1183 kfree(ca);1184}1185 1186static void bch2_dev_free(struct bch_dev *ca)1187{1188 cancel_work_sync(&ca->io_error_work);1189 1190 bch2_dev_unlink(ca);1191 1192 if (ca->kobj.state_in_sysfs)1193 kobject_del(&ca->kobj);1194 1195 bch2_free_super(&ca->disk_sb);1196 bch2_dev_allocator_background_exit(ca);1197 bch2_dev_journal_exit(ca);1198 1199 free_percpu(ca->io_done);1200 bch2_dev_buckets_free(ca);1201 free_page((unsigned long) ca->sb_read_scratch);1202 1203 bch2_time_stats_quantiles_exit(&ca->io_latency[WRITE]);1204 bch2_time_stats_quantiles_exit(&ca->io_latency[READ]);1205 1206 percpu_ref_exit(&ca->io_ref);1207#ifndef CONFIG_BCACHEFS_DEBUG1208 percpu_ref_exit(&ca->ref);1209#endif1210 kobject_put(&ca->kobj);1211}1212 1213static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)1214{1215 1216 lockdep_assert_held(&c->state_lock);1217 1218 if (percpu_ref_is_zero(&ca->io_ref))1219 return;1220 1221 __bch2_dev_read_only(c, ca);1222 1223 reinit_completion(&ca->io_ref_completion);1224 percpu_ref_kill(&ca->io_ref);1225 wait_for_completion(&ca->io_ref_completion);1226 1227 bch2_dev_unlink(ca);1228 1229 bch2_free_super(&ca->disk_sb);1230 bch2_dev_journal_exit(ca);1231}1232 1233#ifndef CONFIG_BCACHEFS_DEBUG1234static void bch2_dev_ref_complete(struct percpu_ref *ref)1235{1236 struct bch_dev *ca = container_of(ref, struct bch_dev, ref);1237 1238 complete(&ca->ref_completion);1239}1240#endif1241 1242static void bch2_dev_io_ref_complete(struct percpu_ref *ref)1243{1244 struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);1245 1246 complete(&ca->io_ref_completion);1247}1248 1249static void bch2_dev_unlink(struct bch_dev *ca)1250{1251 struct kobject *b;1252 1253 /*1254 * This is racy w.r.t. the underlying block device being hot-removed,1255 * which removes it from sysfs.1256 *1257 * It'd be lovely if we had a way to handle this race, but the sysfs1258 * code doesn't appear to provide a good method and block/holder.c is1259 * susceptible as well:1260 */1261 if (ca->kobj.state_in_sysfs &&1262 ca->disk_sb.bdev &&1263 (b = bdev_kobj(ca->disk_sb.bdev))->state_in_sysfs) {1264 sysfs_remove_link(b, "bcachefs");1265 sysfs_remove_link(&ca->kobj, "block");1266 }1267}1268 1269static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)1270{1271 int ret;1272 1273 if (!c->kobj.state_in_sysfs)1274 return 0;1275 1276 if (!ca->kobj.state_in_sysfs) {1277 ret = kobject_add(&ca->kobj, &c->kobj,1278 "dev-%u", ca->dev_idx);1279 if (ret)1280 return ret;1281 }1282 1283 if (ca->disk_sb.bdev) {1284 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);1285 1286 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");1287 if (ret)1288 return ret;1289 1290 ret = sysfs_create_link(&ca->kobj, block, "block");1291 if (ret)1292 return ret;1293 }1294 1295 return 0;1296}1297 1298static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,1299 struct bch_member *member)1300{1301 struct bch_dev *ca;1302 unsigned i;1303 1304 ca = kzalloc(sizeof(*ca), GFP_KERNEL);1305 if (!ca)1306 return NULL;1307 1308 kobject_init(&ca->kobj, &bch2_dev_ktype);1309 init_completion(&ca->ref_completion);1310 init_completion(&ca->io_ref_completion);1311 1312 init_rwsem(&ca->bucket_lock);1313 1314 INIT_WORK(&ca->io_error_work, bch2_io_error_work);1315 1316 bch2_time_stats_quantiles_init(&ca->io_latency[READ]);1317 bch2_time_stats_quantiles_init(&ca->io_latency[WRITE]);1318 1319 ca->mi = bch2_mi_to_cpu(member);1320 1321 for (i = 0; i < ARRAY_SIZE(member->errors); i++)1322 atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i]));1323 1324 ca->uuid = member->uuid;1325 1326 ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,1327 ca->mi.bucket_size / btree_sectors(c));1328 1329#ifndef CONFIG_BCACHEFS_DEBUG1330 if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete, 0, GFP_KERNEL))1331 goto err;1332#else1333 atomic_long_set(&ca->ref, 1);1334#endif1335 1336 bch2_dev_allocator_background_init(ca);1337 1338 if (percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,1339 PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||1340 !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||1341 bch2_dev_buckets_alloc(c, ca) ||1342 !(ca->io_done = alloc_percpu(*ca->io_done)))1343 goto err;1344 1345 return ca;1346err:1347 bch2_dev_free(ca);1348 return NULL;1349}1350 1351static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,1352 unsigned dev_idx)1353{1354 ca->dev_idx = dev_idx;1355 __set_bit(ca->dev_idx, ca->self.d);1356 scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);1357 1358 ca->fs = c;1359 rcu_assign_pointer(c->devs[ca->dev_idx], ca);1360 1361 if (bch2_dev_sysfs_online(c, ca))1362 pr_warn("error creating sysfs objects");1363}1364 1365static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)1366{1367 struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx);1368 struct bch_dev *ca = NULL;1369 int ret = 0;1370 1371 if (bch2_fs_init_fault("dev_alloc"))1372 goto err;1373 1374 ca = __bch2_dev_alloc(c, &member);1375 if (!ca)1376 goto err;1377 1378 ca->fs = c;1379 1380 bch2_dev_attach(c, ca, dev_idx);1381 return ret;1382err:1383 if (ca)1384 bch2_dev_free(ca);1385 return -BCH_ERR_ENOMEM_dev_alloc;1386}1387 1388static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)1389{1390 unsigned ret;1391 1392 if (bch2_dev_is_online(ca)) {1393 bch_err(ca, "already have device online in slot %u",1394 sb->sb->dev_idx);1395 return -BCH_ERR_device_already_online;1396 }1397 1398 if (get_capacity(sb->bdev->bd_disk) <1399 ca->mi.bucket_size * ca->mi.nbuckets) {1400 bch_err(ca, "cannot online: device too small");1401 return -BCH_ERR_device_size_too_small;1402 }1403 1404 BUG_ON(!percpu_ref_is_zero(&ca->io_ref));1405 1406 ret = bch2_dev_journal_init(ca, sb->sb);1407 if (ret)1408 return ret;1409 1410 /* Commit: */1411 ca->disk_sb = *sb;1412 memset(sb, 0, sizeof(*sb));1413 1414 ca->dev = ca->disk_sb.bdev->bd_dev;1415 1416 percpu_ref_reinit(&ca->io_ref);1417 1418 return 0;1419}1420 1421static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)1422{1423 struct bch_dev *ca;1424 int ret;1425 1426 lockdep_assert_held(&c->state_lock);1427 1428 if (le64_to_cpu(sb->sb->seq) >1429 le64_to_cpu(c->disk_sb.sb->seq))1430 bch2_sb_to_fs(c, sb->sb);1431 1432 BUG_ON(!bch2_dev_exists(c, sb->sb->dev_idx));1433 1434 ca = bch2_dev_locked(c, sb->sb->dev_idx);1435 1436 ret = __bch2_dev_attach_bdev(ca, sb);1437 if (ret)1438 return ret;1439 1440 bch2_dev_sysfs_online(c, ca);1441 1442 struct printbuf name = PRINTBUF;1443 prt_bdevname(&name, ca->disk_sb.bdev);1444 1445 if (c->sb.nr_devices == 1)1446 strscpy(c->name, name.buf, sizeof(c->name));1447 strscpy(ca->name, name.buf, sizeof(ca->name));1448 1449 printbuf_exit(&name);1450 1451 rebalance_wakeup(c);1452 return 0;1453}1454 1455/* Device management: */1456 1457/*1458 * Note: this function is also used by the error paths - when a particular1459 * device sees an error, we call it to determine whether we can just set the1460 * device RO, or - if this function returns false - we'll set the whole1461 * filesystem RO:1462 *1463 * XXX: maybe we should be more explicit about whether we're changing state1464 * because we got an error or what have you?1465 */1466bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,1467 enum bch_member_state new_state, int flags)1468{1469 struct bch_devs_mask new_online_devs;1470 int nr_rw = 0, required;1471 1472 lockdep_assert_held(&c->state_lock);1473 1474 switch (new_state) {1475 case BCH_MEMBER_STATE_rw:1476 return true;1477 case BCH_MEMBER_STATE_ro:1478 if (ca->mi.state != BCH_MEMBER_STATE_rw)1479 return true;1480 1481 /* do we have enough devices to write to? */1482 for_each_member_device(c, ca2)1483 if (ca2 != ca)1484 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;1485 1486 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)1487 ? c->opts.metadata_replicas1488 : metadata_replicas_required(c),1489 !(flags & BCH_FORCE_IF_DATA_DEGRADED)1490 ? c->opts.data_replicas1491 : data_replicas_required(c));1492 1493 return nr_rw >= required;1494 case BCH_MEMBER_STATE_failed:1495 case BCH_MEMBER_STATE_spare:1496 if (ca->mi.state != BCH_MEMBER_STATE_rw &&1497 ca->mi.state != BCH_MEMBER_STATE_ro)1498 return true;1499 1500 /* do we have enough devices to read from? */1501 new_online_devs = bch2_online_devs(c);1502 __clear_bit(ca->dev_idx, new_online_devs.d);1503 1504 return bch2_have_enough_devs(c, new_online_devs, flags, false);1505 default:1506 BUG();1507 }1508}1509 1510static bool bch2_fs_may_start(struct bch_fs *c)1511{1512 struct bch_dev *ca;1513 unsigned i, flags = 0;1514 1515 if (c->opts.very_degraded)1516 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;1517 1518 if (c->opts.degraded)1519 flags |= BCH_FORCE_IF_DEGRADED;1520 1521 if (!c->opts.degraded &&1522 !c->opts.very_degraded) {1523 mutex_lock(&c->sb_lock);1524 1525 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {1526 if (!bch2_member_exists(c->disk_sb.sb, i))1527 continue;1528 1529 ca = bch2_dev_locked(c, i);1530 1531 if (!bch2_dev_is_online(ca) &&1532 (ca->mi.state == BCH_MEMBER_STATE_rw ||1533 ca->mi.state == BCH_MEMBER_STATE_ro)) {1534 mutex_unlock(&c->sb_lock);1535 return false;1536 }1537 }1538 mutex_unlock(&c->sb_lock);1539 }1540 1541 return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);1542}1543 1544static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)1545{1546 /*1547 * The allocator thread itself allocates btree nodes, so stop it first:1548 */1549 bch2_dev_allocator_remove(c, ca);1550 bch2_recalc_capacity(c);1551 bch2_dev_journal_stop(&c->journal, ca);1552}1553 1554static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)1555{1556 lockdep_assert_held(&c->state_lock);1557 1558 BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);1559 1560 bch2_dev_allocator_add(c, ca);1561 bch2_recalc_capacity(c);1562 bch2_dev_do_discards(ca);1563}1564 1565int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,1566 enum bch_member_state new_state, int flags)1567{1568 struct bch_member *m;1569 int ret = 0;1570 1571 if (ca->mi.state == new_state)1572 return 0;1573 1574 if (!bch2_dev_state_allowed(c, ca, new_state, flags))1575 return -BCH_ERR_device_state_not_allowed;1576 1577 if (new_state != BCH_MEMBER_STATE_rw)1578 __bch2_dev_read_only(c, ca);1579 1580 bch_notice(ca, "%s", bch2_member_states[new_state]);1581 1582 mutex_lock(&c->sb_lock);1583 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);1584 SET_BCH_MEMBER_STATE(m, new_state);1585 bch2_write_super(c);1586 mutex_unlock(&c->sb_lock);1587 1588 if (new_state == BCH_MEMBER_STATE_rw)1589 __bch2_dev_read_write(c, ca);1590 1591 rebalance_wakeup(c);1592 1593 return ret;1594}1595 1596int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,1597 enum bch_member_state new_state, int flags)1598{1599 int ret;1600 1601 down_write(&c->state_lock);1602 ret = __bch2_dev_set_state(c, ca, new_state, flags);1603 up_write(&c->state_lock);1604 1605 return ret;1606}1607 1608/* Device add/removal: */1609 1610int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)1611{1612 struct bch_member *m;1613 unsigned dev_idx = ca->dev_idx, data;1614 int ret;1615 1616 down_write(&c->state_lock);1617 1618 /*1619 * We consume a reference to ca->ref, regardless of whether we succeed1620 * or fail:1621 */1622 bch2_dev_put(ca);1623 1624 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {1625 bch_err(ca, "Cannot remove without losing data");1626 ret = -BCH_ERR_device_state_not_allowed;1627 goto err;1628 }1629 1630 __bch2_dev_read_only(c, ca);1631 1632 ret = bch2_dev_data_drop(c, ca->dev_idx, flags);1633 bch_err_msg(ca, ret, "bch2_dev_data_drop()");1634 if (ret)1635 goto err;1636 1637 ret = bch2_dev_remove_alloc(c, ca);1638 bch_err_msg(ca, ret, "bch2_dev_remove_alloc()");1639 if (ret)1640 goto err;1641 1642 /*1643 * We need to flush the entire journal to get rid of keys that reference1644 * the device being removed before removing the superblock entry1645 */1646 bch2_journal_flush_all_pins(&c->journal);1647 1648 /*1649 * this is really just needed for the bch2_replicas_gc_(start|end)1650 * calls, and could be cleaned up:1651 */1652 ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);1653 bch_err_msg(ca, ret, "bch2_journal_flush_device_pins()");1654 if (ret)1655 goto err;1656 1657 ret = bch2_journal_flush(&c->journal);1658 bch_err_msg(ca, ret, "bch2_journal_flush()");1659 if (ret)1660 goto err;1661 1662 ret = bch2_replicas_gc2(c);1663 bch_err_msg(ca, ret, "bch2_replicas_gc2()");1664 if (ret)1665 goto err;1666 1667 data = bch2_dev_has_data(c, ca);1668 if (data) {1669 struct printbuf data_has = PRINTBUF;1670 1671 prt_bitflags(&data_has, __bch2_data_types, data);1672 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);1673 printbuf_exit(&data_has);1674 ret = -EBUSY;1675 goto err;1676 }1677 1678 __bch2_dev_offline(c, ca);1679 1680 mutex_lock(&c->sb_lock);1681 rcu_assign_pointer(c->devs[ca->dev_idx], NULL);1682 mutex_unlock(&c->sb_lock);1683 1684#ifndef CONFIG_BCACHEFS_DEBUG1685 percpu_ref_kill(&ca->ref);1686#else1687 ca->dying = true;1688 bch2_dev_put(ca);1689#endif1690 wait_for_completion(&ca->ref_completion);1691 1692 bch2_dev_free(ca);1693 1694 /*1695 * Free this device's slot in the bch_member array - all pointers to1696 * this device must be gone:1697 */1698 mutex_lock(&c->sb_lock);1699 m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);1700 memset(&m->uuid, 0, sizeof(m->uuid));1701 1702 bch2_write_super(c);1703 1704 mutex_unlock(&c->sb_lock);1705 up_write(&c->state_lock);1706 return 0;1707err:1708 if (ca->mi.state == BCH_MEMBER_STATE_rw &&1709 !percpu_ref_is_zero(&ca->io_ref))1710 __bch2_dev_read_write(c, ca);1711 up_write(&c->state_lock);1712 return ret;1713}1714 1715/* Add new device to running filesystem: */1716int bch2_dev_add(struct bch_fs *c, const char *path)1717{1718 struct bch_opts opts = bch2_opts_empty();1719 struct bch_sb_handle sb;1720 struct bch_dev *ca = NULL;1721 struct printbuf errbuf = PRINTBUF;1722 struct printbuf label = PRINTBUF;1723 int ret;1724 1725 ret = bch2_read_super(path, &opts, &sb);1726 bch_err_msg(c, ret, "reading super");1727 if (ret)1728 goto err;1729 1730 struct bch_member dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx);1731 1732 if (BCH_MEMBER_GROUP(&dev_mi)) {1733 bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);1734 if (label.allocation_failure) {1735 ret = -ENOMEM;1736 goto err;1737 }1738 }1739 1740 ret = bch2_dev_may_add(sb.sb, c);1741 if (ret)1742 goto err;1743 1744 ca = __bch2_dev_alloc(c, &dev_mi);1745 if (!ca) {1746 ret = -ENOMEM;1747 goto err;1748 }1749 1750 ret = __bch2_dev_attach_bdev(ca, &sb);1751 if (ret)1752 goto err;1753 1754 ret = bch2_dev_journal_alloc(ca, true);1755 bch_err_msg(c, ret, "allocating journal");1756 if (ret)1757 goto err;1758 1759 down_write(&c->state_lock);1760 mutex_lock(&c->sb_lock);1761 1762 ret = bch2_sb_from_fs(c, ca);1763 bch_err_msg(c, ret, "setting up new superblock");1764 if (ret)1765 goto err_unlock;1766 1767 if (dynamic_fault("bcachefs:add:no_slot"))1768 goto err_unlock;1769 1770 ret = bch2_sb_member_alloc(c);1771 if (ret < 0) {1772 bch_err_msg(c, ret, "setting up new superblock");1773 goto err_unlock;1774 }1775 unsigned dev_idx = ret;1776 1777 /* success: */1778 1779 dev_mi.last_mount = cpu_to_le64(ktime_get_real_seconds());1780 *bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx) = dev_mi;1781 1782 ca->disk_sb.sb->dev_idx = dev_idx;1783 bch2_dev_attach(c, ca, dev_idx);1784 1785 if (BCH_MEMBER_GROUP(&dev_mi)) {1786 ret = __bch2_dev_group_set(c, ca, label.buf);1787 bch_err_msg(c, ret, "creating new label");1788 if (ret)1789 goto err_unlock;1790 }1791 1792 bch2_write_super(c);1793 mutex_unlock(&c->sb_lock);1794 1795 ret = bch2_dev_usage_init(ca, false);1796 if (ret)1797 goto err_late;1798 1799 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);1800 bch_err_msg(ca, ret, "marking new superblock");1801 if (ret)1802 goto err_late;1803 1804 ret = bch2_fs_freespace_init(c);1805 bch_err_msg(ca, ret, "initializing free space");1806 if (ret)1807 goto err_late;1808 1809 ca->new_fs_bucket_idx = 0;1810 1811 if (ca->mi.state == BCH_MEMBER_STATE_rw)1812 __bch2_dev_read_write(c, ca);1813 1814 up_write(&c->state_lock);1815 return 0;1816 1817err_unlock:1818 mutex_unlock(&c->sb_lock);1819 up_write(&c->state_lock);1820err:1821 if (ca)1822 bch2_dev_free(ca);1823 bch2_free_super(&sb);1824 printbuf_exit(&label);1825 printbuf_exit(&errbuf);1826 bch_err_fn(c, ret);1827 return ret;1828err_late:1829 up_write(&c->state_lock);1830 ca = NULL;1831 goto err;1832}1833 1834/* Hot add existing device to running filesystem: */1835int bch2_dev_online(struct bch_fs *c, const char *path)1836{1837 struct bch_opts opts = bch2_opts_empty();1838 struct bch_sb_handle sb = { NULL };1839 struct bch_dev *ca;1840 unsigned dev_idx;1841 int ret;1842 1843 down_write(&c->state_lock);1844 1845 ret = bch2_read_super(path, &opts, &sb);1846 if (ret) {1847 up_write(&c->state_lock);1848 return ret;1849 }1850 1851 dev_idx = sb.sb->dev_idx;1852 1853 ret = bch2_dev_in_fs(&c->disk_sb, &sb, &c->opts);1854 bch_err_msg(c, ret, "bringing %s online", path);1855 if (ret)1856 goto err;1857 1858 ret = bch2_dev_attach_bdev(c, &sb);1859 if (ret)1860 goto err;1861 1862 ca = bch2_dev_locked(c, dev_idx);1863 1864 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);1865 bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path);1866 if (ret)1867 goto err;1868 1869 if (ca->mi.state == BCH_MEMBER_STATE_rw)1870 __bch2_dev_read_write(c, ca);1871 1872 if (!ca->mi.freespace_initialized) {1873 ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);1874 bch_err_msg(ca, ret, "initializing free space");1875 if (ret)1876 goto err;1877 }1878 1879 if (!ca->journal.nr) {1880 ret = bch2_dev_journal_alloc(ca, false);1881 bch_err_msg(ca, ret, "allocating journal");1882 if (ret)1883 goto err;1884 }1885 1886 mutex_lock(&c->sb_lock);1887 bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount =1888 cpu_to_le64(ktime_get_real_seconds());1889 bch2_write_super(c);1890 mutex_unlock(&c->sb_lock);1891 1892 up_write(&c->state_lock);1893 return 0;1894err:1895 up_write(&c->state_lock);1896 bch2_free_super(&sb);1897 return ret;1898}1899 1900int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)1901{1902 down_write(&c->state_lock);1903 1904 if (!bch2_dev_is_online(ca)) {1905 bch_err(ca, "Already offline");1906 up_write(&c->state_lock);1907 return 0;1908 }1909 1910 if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {1911 bch_err(ca, "Cannot offline required disk");1912 up_write(&c->state_lock);1913 return -BCH_ERR_device_state_not_allowed;1914 }1915 1916 __bch2_dev_offline(c, ca);1917 1918 up_write(&c->state_lock);1919 return 0;1920}1921 1922int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)1923{1924 struct bch_member *m;1925 u64 old_nbuckets;1926 int ret = 0;1927 1928 down_write(&c->state_lock);1929 old_nbuckets = ca->mi.nbuckets;1930 1931 if (nbuckets < ca->mi.nbuckets) {1932 bch_err(ca, "Cannot shrink yet");1933 ret = -EINVAL;1934 goto err;1935 }1936 1937 if (nbuckets > BCH_MEMBER_NBUCKETS_MAX) {1938 bch_err(ca, "New device size too big (%llu greater than max %u)",1939 nbuckets, BCH_MEMBER_NBUCKETS_MAX);1940 ret = -BCH_ERR_device_size_too_big;1941 goto err;1942 }1943 1944 if (bch2_dev_is_online(ca) &&1945 get_capacity(ca->disk_sb.bdev->bd_disk) <1946 ca->mi.bucket_size * nbuckets) {1947 bch_err(ca, "New size larger than device");1948 ret = -BCH_ERR_device_size_too_small;1949 goto err;1950 }1951 1952 ret = bch2_dev_buckets_resize(c, ca, nbuckets);1953 bch_err_msg(ca, ret, "resizing buckets");1954 if (ret)1955 goto err;1956 1957 ret = bch2_trans_mark_dev_sb(c, ca, BTREE_TRIGGER_transactional);1958 if (ret)1959 goto err;1960 1961 mutex_lock(&c->sb_lock);1962 m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);1963 m->nbuckets = cpu_to_le64(nbuckets);1964 1965 bch2_write_super(c);1966 mutex_unlock(&c->sb_lock);1967 1968 if (ca->mi.freespace_initialized) {1969 struct disk_accounting_pos acc = {1970 .type = BCH_DISK_ACCOUNTING_dev_data_type,1971 .dev_data_type.dev = ca->dev_idx,1972 .dev_data_type.data_type = BCH_DATA_free,1973 };1974 u64 v[3] = { nbuckets - old_nbuckets, 0, 0 };1975 1976 ret = bch2_trans_commit_do(ca->fs, NULL, NULL, 0,1977 bch2_disk_accounting_mod(trans, &acc, v, ARRAY_SIZE(v), false)) ?:1978 bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets);1979 if (ret)1980 goto err;1981 }1982 1983 bch2_recalc_capacity(c);1984err:1985 up_write(&c->state_lock);1986 return ret;1987}1988 1989/* return with ref on ca->ref: */1990struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)1991{1992 if (!strncmp(name, "/dev/", strlen("/dev/")))1993 name += strlen("/dev/");1994 1995 for_each_member_device(c, ca)1996 if (!strcmp(name, ca->name))1997 return ca;1998 return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found);1999}2000 2001/* Filesystem open: */2002 2003static inline int sb_cmp(struct bch_sb *l, struct bch_sb *r)2004{2005 return cmp_int(le64_to_cpu(l->seq), le64_to_cpu(r->seq)) ?:2006 cmp_int(le64_to_cpu(l->write_time), le64_to_cpu(r->write_time));2007}2008 2009struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,2010 struct bch_opts opts)2011{2012 DARRAY(struct bch_sb_handle) sbs = { 0 };2013 struct bch_fs *c = NULL;2014 struct bch_sb_handle *best = NULL;2015 struct printbuf errbuf = PRINTBUF;2016 int ret = 0;2017 2018 if (!try_module_get(THIS_MODULE))2019 return ERR_PTR(-ENODEV);2020 2021 if (!nr_devices) {2022 ret = -EINVAL;2023 goto err;2024 }2025 2026 ret = darray_make_room(&sbs, nr_devices);2027 if (ret)2028 goto err;2029 2030 for (unsigned i = 0; i < nr_devices; i++) {2031 struct bch_sb_handle sb = { NULL };2032 2033 ret = bch2_read_super(devices[i], &opts, &sb);2034 if (ret)2035 goto err;2036 2037 BUG_ON(darray_push(&sbs, sb));2038 }2039 2040 if (opts.nochanges && !opts.read_only) {2041 ret = -BCH_ERR_erofs_nochanges;2042 goto err_print;2043 }2044 2045 darray_for_each(sbs, sb)2046 if (!best || sb_cmp(sb->sb, best->sb) > 0)2047 best = sb;2048 2049 darray_for_each_reverse(sbs, sb) {2050 ret = bch2_dev_in_fs(best, sb, &opts);2051 2052 if (ret == -BCH_ERR_device_has_been_removed ||2053 ret == -BCH_ERR_device_splitbrain) {2054 bch2_free_super(sb);2055 darray_remove_item(&sbs, sb);2056 best -= best > sb;2057 ret = 0;2058 continue;2059 }2060 2061 if (ret)2062 goto err_print;2063 }2064 2065 c = bch2_fs_alloc(best->sb, opts);2066 ret = PTR_ERR_OR_ZERO(c);2067 if (ret)2068 goto err;2069 2070 down_write(&c->state_lock);2071 darray_for_each(sbs, sb) {2072 ret = bch2_dev_attach_bdev(c, sb);2073 if (ret) {2074 up_write(&c->state_lock);2075 goto err;2076 }2077 }2078 up_write(&c->state_lock);2079 2080 if (!bch2_fs_may_start(c)) {2081 ret = -BCH_ERR_insufficient_devices_to_start;2082 goto err_print;2083 }2084 2085 if (!c->opts.nostart) {2086 ret = bch2_fs_start(c);2087 if (ret)2088 goto err;2089 }2090out:2091 darray_for_each(sbs, sb)2092 bch2_free_super(sb);2093 darray_exit(&sbs);2094 printbuf_exit(&errbuf);2095 module_put(THIS_MODULE);2096 return c;2097err_print:2098 pr_err("bch_fs_open err opening %s: %s",2099 devices[0], bch2_err_str(ret));2100err:2101 if (!IS_ERR_OR_NULL(c))2102 bch2_fs_stop(c);2103 c = ERR_PTR(ret);2104 goto out;2105}2106 2107/* Global interfaces/init */2108 2109static void bcachefs_exit(void)2110{2111 bch2_debug_exit();2112 bch2_vfs_exit();2113 bch2_chardev_exit();2114 bch2_btree_key_cache_exit();2115 if (bcachefs_kset)2116 kset_unregister(bcachefs_kset);2117}2118 2119static int __init bcachefs_init(void)2120{2121 bch2_bkey_pack_test();2122 2123 if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||2124 bch2_btree_key_cache_init() ||2125 bch2_chardev_init() ||2126 bch2_vfs_init() ||2127 bch2_debug_init())2128 goto err;2129 2130 return 0;2131err:2132 bcachefs_exit();2133 return -ENOMEM;2134}2135 2136#define BCH_DEBUG_PARAM(name, description) \2137 bool bch2_##name; \2138 module_param_named(name, bch2_##name, bool, 0644); \2139 MODULE_PARM_DESC(name, description);2140BCH_DEBUG_PARAMS()2141#undef BCH_DEBUG_PARAM2142 2143__maybe_unused2144static unsigned bch2_metadata_version = bcachefs_metadata_version_current;2145module_param_named(version, bch2_metadata_version, uint, 0400);2146 2147module_exit(bcachefs_exit);2148module_init(bcachefs_init);2149