git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * bcachefs setup/teardown code, and some metadata io - read a superblock and
   4  * figure out what to do with it.
   5  *
   6  * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
   7  * Copyright 2012 Google, Inc.
   8  */
   9
  10 #include "bcachefs.h"
  11 #include "alloc_background.h"
  12 #include "alloc_foreground.h"
  13 #include "bkey_sort.h"
  14 #include "btree_cache.h"
  15 #include "btree_gc.h"
  16 #include "btree_key_cache.h"
  17 #include "btree_update_interior.h"
  18 #include "btree_io.h"
  19 #include "buckets_waiting_for_journal.h"
  20 #include "chardev.h"
  21 #include "checksum.h"
  22 #include "clock.h"
  23 #include "compress.h"
  24 #include "debug.h"
  25 #include "disk_groups.h"
  26 #include "ec.h"
  27 #include "errcode.h"
  28 #include "error.h"
  29 #include "fs.h"
  30 #include "fs-io.h"
  31 #include "fsck.h"
  32 #include "inode.h"
  33 #include "io.h"
  34 #include "journal.h"
  35 #include "journal_reclaim.h"
  36 #include "journal_seq_blacklist.h"
  37 #include "move.h"
  38 #include "migrate.h"
  39 #include "movinggc.h"
  40 #include "nocow_locking.h"
  41 #include "quota.h"
  42 #include "rebalance.h"
  43 #include "recovery.h"
  44 #include "replicas.h"
  45 #include "subvolume.h"
  46 #include "super.h"
  47 #include "super-io.h"
  48 #include "sysfs.h"
  49 #include "counters.h"
  50
  51 #include <linux/backing-dev.h>
  52 #include <linux/blkdev.h>
  53 #include <linux/debugfs.h>
  54 #include <linux/device.h>
  55 #include <linux/idr.h>
  56 #include <linux/module.h>
  57 #include <linux/percpu.h>
  58 #include <linux/random.h>
  59 #include <linux/sysfs.h>
  60 #include <crypto/hash.h>
  61
  62 #include <trace/events/bcachefs.h>
  63
  64 MODULE_LICENSE("GPL");
  65 MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
  66
  67 #define KTYPE(type)                                                     \
  68 static const struct attribute_group type ## _group = {                  \
  69         .attrs = type ## _files                                         \
  70 };                                                                      \
  71                                                                         \
  72 static const struct attribute_group *type ## _groups[] = {              \
  73         &type ## _group,                                                \
  74         NULL                                                            \
  75 };                                                                      \
  76                                                                         \
  77 static const struct kobj_type type ## _ktype = {                        \
  78         .release        = type ## _release,                             \
  79         .sysfs_ops      = &type ## _sysfs_ops,                          \
  80         .default_groups = type ## _groups                               \
  81 }
  82
  83 static void bch2_fs_release(struct kobject *);
  84 static void bch2_dev_release(struct kobject *);
  85 static void bch2_fs_counters_release(struct kobject *k)
  86 {
  87 }
  88
  89 static void bch2_fs_internal_release(struct kobject *k)
  90 {
  91 }
  92
  93 static void bch2_fs_opts_dir_release(struct kobject *k)
  94 {
  95 }
  96
  97 static void bch2_fs_time_stats_release(struct kobject *k)
  98 {
  99 }
 100
 101 KTYPE(bch2_fs);
 102 KTYPE(bch2_fs_counters);
 103 KTYPE(bch2_fs_internal);
 104 KTYPE(bch2_fs_opts_dir);
 105 KTYPE(bch2_fs_time_stats);
 106 KTYPE(bch2_dev);
 107
 108 static struct kset *bcachefs_kset;
 109 static LIST_HEAD(bch_fs_list);
 110 static DEFINE_MUTEX(bch_fs_list_lock);
 111
 112 DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);
 113
 114 static void bch2_dev_free(struct bch_dev *);
 115 static int bch2_dev_alloc(struct bch_fs *, unsigned);
 116 static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
 117 static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
 118
 119 struct bch_fs *bch2_dev_to_fs(dev_t dev)
 120 {
 121         struct bch_fs *c;
 122         struct bch_dev *ca;
 123         unsigned i;
 124
 125         mutex_lock(&bch_fs_list_lock);
 126         rcu_read_lock();
 127
 128         list_for_each_entry(c, &bch_fs_list, list)
 129                 for_each_member_device_rcu(ca, c, i, NULL)
 130                         if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
 131                                 closure_get(&c->cl);
 132                                 goto found;
 133                         }
 134         c = NULL;
 135 found:
 136         rcu_read_unlock();
 137         mutex_unlock(&bch_fs_list_lock);
 138
 139         return c;
 140 }
 141
 142 static struct bch_fs *__bch2_uuid_to_fs(uuid_le uuid)
 143 {
 144         struct bch_fs *c;
 145
 146         lockdep_assert_held(&bch_fs_list_lock);
 147
 148         list_for_each_entry(c, &bch_fs_list, list)
 149                 if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid_le)))
 150                         return c;
 151
 152         return NULL;
 153 }
 154
 155 struct bch_fs *bch2_uuid_to_fs(uuid_le uuid)
 156 {
 157         struct bch_fs *c;
 158
 159         mutex_lock(&bch_fs_list_lock);
 160         c = __bch2_uuid_to_fs(uuid);
 161         if (c)
 162                 closure_get(&c->cl);
 163         mutex_unlock(&bch_fs_list_lock);
 164
 165         return c;
 166 }
 167
 168 static void bch2_dev_usage_journal_reserve(struct bch_fs *c)
 169 {
 170         struct bch_dev *ca;
 171         unsigned i, nr = 0, u64s =
 172                 ((sizeof(struct jset_entry_dev_usage) +
 173                   sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) /
 174                 sizeof(u64);
 175
 176         rcu_read_lock();
 177         for_each_member_device_rcu(ca, c, i, NULL)
 178                 nr++;
 179         rcu_read_unlock();
 180
 181         bch2_journal_entry_res_resize(&c->journal,
 182                         &c->dev_usage_journal_res, u64s * nr);
 183 }
 184
 185 /* Filesystem RO/RW: */
 186
 187 /*
 188  * For startup/shutdown of RW stuff, the dependencies are:
 189  *
 190  * - foreground writes depend on copygc and rebalance (to free up space)
 191  *
 192  * - copygc and rebalance depend on mark and sweep gc (they actually probably
 193  *   don't because they either reserve ahead of time or don't block if
 194  *   allocations fail, but allocations can require mark and sweep gc to run
 195  *   because of generation number wraparound)
 196  *
 197  * - all of the above depends on the allocator threads
 198  *
 199  * - allocator depends on the journal (when it rewrites prios and gens)
 200  */
 201
 202 static void __bch2_fs_read_only(struct bch_fs *c)
 203 {
 204         struct bch_dev *ca;
 205         unsigned i, clean_passes = 0;
 206         u64 seq = 0;
 207
 208         bch2_rebalance_stop(c);
 209         bch2_copygc_stop(c);
 210         bch2_gc_thread_stop(c);
 211
 212         bch_verbose(c, "flushing journal and stopping allocators");
 213
 214         do {
 215                 clean_passes++;
 216
 217                 if (bch2_btree_interior_updates_flush(c) ||
 218                     bch2_journal_flush_all_pins(&c->journal) ||
 219                     bch2_btree_flush_all_writes(c) ||
 220                     seq != atomic64_read(&c->journal.seq)) {
 221                         seq = atomic64_read(&c->journal.seq);
 222                         clean_passes = 0;
 223                 }
 224         } while (clean_passes < 2);
 225
 226         bch_verbose(c, "flushing journal and stopping allocators complete");
 227
 228         if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) &&
 229             !test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
 230                 set_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
 231         bch2_fs_journal_stop(&c->journal);
 232
 233         /*
 234          * After stopping journal:
 235          */
 236         for_each_member_device(ca, c, i)
 237                 bch2_dev_allocator_remove(c, ca);
 238 }
 239
 240 #ifndef BCH_WRITE_REF_DEBUG
 241 static void bch2_writes_disabled(struct percpu_ref *writes)
 242 {
 243         struct bch_fs *c = container_of(writes, struct bch_fs, writes);
 244
 245         set_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
 246         wake_up(&bch2_read_only_wait);
 247 }
 248 #endif
 249
 250 void bch2_fs_read_only(struct bch_fs *c)
 251 {
 252         if (!test_bit(BCH_FS_RW, &c->flags)) {
 253                 bch2_journal_reclaim_stop(&c->journal);
 254                 return;
 255         }
 256
 257         BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
 258
 259         /*
 260          * Block new foreground-end write operations from starting - any new
 261          * writes will return -EROFS:
 262          */
 263         set_bit(BCH_FS_GOING_RO, &c->flags);
 264 #ifndef BCH_WRITE_REF_DEBUG
 265         percpu_ref_kill(&c->writes);
 266 #else
 267         for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
 268                 bch2_write_ref_put(c, i);
 269 #endif
 270
 271         /*
 272          * If we're not doing an emergency shutdown, we want to wait on
 273          * outstanding writes to complete so they don't see spurious errors due
 274          * to shutting down the allocator:
 275          *
 276          * If we are doing an emergency shutdown outstanding writes may
 277          * hang until we shutdown the allocator so we don't want to wait
 278          * on outstanding writes before shutting everything down - but
 279          * we do need to wait on them before returning and signalling
 280          * that going RO is complete:
 281          */
 282         wait_event(bch2_read_only_wait,
 283                    test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
 284                    test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
 285
 286         __bch2_fs_read_only(c);
 287
 288         wait_event(bch2_read_only_wait,
 289                    test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
 290
 291         clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
 292         clear_bit(BCH_FS_GOING_RO, &c->flags);
 293
 294         if (!bch2_journal_error(&c->journal) &&
 295             !test_bit(BCH_FS_ERROR, &c->flags) &&
 296             !test_bit(BCH_FS_EMERGENCY_RO, &c->flags) &&
 297             test_bit(BCH_FS_STARTED, &c->flags) &&
 298             test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags) &&
 299             !c->opts.norecovery) {
 300                 bch_verbose(c, "marking filesystem clean");
 301                 bch2_fs_mark_clean(c);
 302         }
 303
 304         clear_bit(BCH_FS_RW, &c->flags);
 305 }
 306
 307 static void bch2_fs_read_only_work(struct work_struct *work)
 308 {
 309         struct bch_fs *c =
 310                 container_of(work, struct bch_fs, read_only_work);
 311
 312         down_write(&c->state_lock);
 313         bch2_fs_read_only(c);
 314         up_write(&c->state_lock);
 315 }
 316
 317 static void bch2_fs_read_only_async(struct bch_fs *c)
 318 {
 319         queue_work(system_long_wq, &c->read_only_work);
 320 }
 321
 322 bool bch2_fs_emergency_read_only(struct bch_fs *c)
 323 {
 324         bool ret = !test_and_set_bit(BCH_FS_EMERGENCY_RO, &c->flags);
 325
 326         bch2_journal_halt(&c->journal);
 327         bch2_fs_read_only_async(c);
 328
 329         wake_up(&bch2_read_only_wait);
 330         return ret;
 331 }
 332
 333 static int bch2_fs_read_write_late(struct bch_fs *c)
 334 {
 335         int ret;
 336
 337         ret = bch2_rebalance_start(c);
 338         if (ret) {
 339                 bch_err(c, "error starting rebalance thread");
 340                 return ret;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static int __bch2_fs_read_write(struct bch_fs *c, bool early)
 347 {
 348         struct bch_dev *ca;
 349         unsigned i;
 350         int ret;
 351
 352         if (test_bit(BCH_FS_INITIAL_GC_UNFIXED, &c->flags)) {
 353                 bch_err(c, "cannot go rw, unfixed btree errors");
 354                 return -EROFS;
 355         }
 356
 357         if (test_bit(BCH_FS_RW, &c->flags))
 358                 return 0;
 359
 360         /*
 361          * nochanges is used for fsck -n mode - we have to allow going rw
 362          * during recovery for that to work:
 363          */
 364         if (c->opts.norecovery ||
 365             (c->opts.nochanges &&
 366              (!early || c->opts.read_only)))
 367                 return -EROFS;
 368
 369         bch_info(c, "going read-write");
 370
 371         ret = bch2_fs_mark_dirty(c);
 372         if (ret)
 373                 goto err;
 374
 375         clear_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags);
 376
 377         /*
 378          * First journal write must be a flush write: after a clean shutdown we
 379          * don't read the journal, so the first journal write may end up
 380          * overwriting whatever was there previously, and there must always be
 381          * at least one non-flush write in the journal or recovery will fail:
 382          */
 383         set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags);
 384
 385         for_each_rw_member(ca, c, i)
 386                 bch2_dev_allocator_add(c, ca);
 387         bch2_recalc_capacity(c);
 388
 389         ret = bch2_gc_thread_start(c);
 390         if (ret) {
 391                 bch_err(c, "error starting gc thread");
 392                 return ret;
 393         }
 394
 395         ret = bch2_copygc_start(c);
 396         if (ret) {
 397                 bch_err(c, "error starting copygc thread");
 398                 return ret;
 399         }
 400
 401         if (!early) {
 402                 ret = bch2_fs_read_write_late(c);
 403                 if (ret)
 404                         goto err;
 405         }
 406
 407 #ifndef BCH_WRITE_REF_DEBUG
 408         percpu_ref_reinit(&c->writes);
 409 #else
 410         for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) {
 411                 BUG_ON(atomic_long_read(&c->writes[i]));
 412                 atomic_long_inc(&c->writes[i]);
 413         }
 414 #endif
 415         set_bit(BCH_FS_RW, &c->flags);
 416         set_bit(BCH_FS_WAS_RW, &c->flags);
 417
 418         bch2_do_discards(c);
 419         bch2_do_invalidates(c);
 420         bch2_do_stripe_deletes(c);
 421         return 0;
 422 err:
 423         __bch2_fs_read_only(c);
 424         return ret;
 425 }
 426
 427 int bch2_fs_read_write(struct bch_fs *c)
 428 {
 429         return __bch2_fs_read_write(c, false);
 430 }
 431
 432 int bch2_fs_read_write_early(struct bch_fs *c)
 433 {
 434         lockdep_assert_held(&c->state_lock);
 435
 436         return __bch2_fs_read_write(c, true);
 437 }
 438
 439 /* Filesystem startup/shutdown: */
 440
 441 static void __bch2_fs_free(struct bch_fs *c)
 442 {
 443         unsigned i;
 444         int cpu;
 445
 446         for (i = 0; i < BCH_TIME_STAT_NR; i++)
 447                 bch2_time_stats_exit(&c->times[i]);
 448
 449         bch2_fs_counters_exit(c);
 450         bch2_fs_snapshots_exit(c);
 451         bch2_fs_quota_exit(c);
 452         bch2_fs_fsio_exit(c);
 453         bch2_fs_ec_exit(c);
 454         bch2_fs_encryption_exit(c);
 455         bch2_fs_io_exit(c);
 456         bch2_fs_buckets_waiting_for_journal_exit(c);
 457         bch2_fs_btree_interior_update_exit(c);
 458         bch2_fs_btree_iter_exit(c);
 459         bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
 460         bch2_fs_btree_cache_exit(c);
 461         bch2_fs_replicas_exit(c);
 462         bch2_fs_journal_exit(&c->journal);
 463         bch2_io_clock_exit(&c->io_clock[WRITE]);
 464         bch2_io_clock_exit(&c->io_clock[READ]);
 465         bch2_fs_compress_exit(c);
 466         bch2_journal_keys_free(&c->journal_keys);
 467         bch2_journal_entries_free(c);
 468         percpu_free_rwsem(&c->mark_lock);
 469         free_percpu(c->online_reserved);
 470
 471         if (c->btree_paths_bufs)
 472                 for_each_possible_cpu(cpu)
 473                         kfree(per_cpu_ptr(c->btree_paths_bufs, cpu)->path);
 474
 475         free_percpu(c->btree_paths_bufs);
 476         free_percpu(c->pcpu);
 477         mempool_exit(&c->large_bkey_pool);
 478         mempool_exit(&c->btree_bounce_pool);
 479         bioset_exit(&c->btree_bio);
 480         mempool_exit(&c->fill_iter);
 481 #ifndef BCH_WRITE_REF_DEBUG
 482         percpu_ref_exit(&c->writes);
 483 #endif
 484         kfree(rcu_dereference_protected(c->disk_groups, 1));
 485         kfree(c->journal_seq_blacklist_table);
 486         kfree(c->unused_inode_hints);
 487         free_heap(&c->copygc_heap);
 488
 489         if (c->io_complete_wq)
 490                 destroy_workqueue(c->io_complete_wq);
 491         if (c->copygc_wq)
 492                 destroy_workqueue(c->copygc_wq);
 493         if (c->btree_io_complete_wq)
 494                 destroy_workqueue(c->btree_io_complete_wq);
 495         if (c->btree_update_wq)
 496                 destroy_workqueue(c->btree_update_wq);
 497
 498         bch2_free_super(&c->disk_sb);
 499         kvpfree(c, sizeof(*c));
 500         module_put(THIS_MODULE);
 501 }
 502
 503 static void bch2_fs_release(struct kobject *kobj)
 504 {
 505         struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
 506
 507         __bch2_fs_free(c);
 508 }
 509
 510 void __bch2_fs_stop(struct bch_fs *c)
 511 {
 512         struct bch_dev *ca;
 513         unsigned i;
 514
 515         bch_verbose(c, "shutting down");
 516
 517         set_bit(BCH_FS_STOPPING, &c->flags);
 518
 519         cancel_work_sync(&c->journal_seq_blacklist_gc_work);
 520
 521         down_write(&c->state_lock);
 522         bch2_fs_read_only(c);
 523         up_write(&c->state_lock);
 524
 525         for_each_member_device(ca, c, i)
 526                 if (ca->kobj.state_in_sysfs &&
 527                     ca->disk_sb.bdev)
 528                         sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
 529
 530         if (c->kobj.state_in_sysfs)
 531                 kobject_del(&c->kobj);
 532
 533         bch2_fs_debug_exit(c);
 534         bch2_fs_chardev_exit(c);
 535
 536         kobject_put(&c->counters_kobj);
 537         kobject_put(&c->time_stats);
 538         kobject_put(&c->opts_dir);
 539         kobject_put(&c->internal);
 540
 541         /* btree prefetch might have kicked off reads in the background: */
 542         bch2_btree_flush_all_reads(c);
 543
 544         for_each_member_device(ca, c, i)
 545                 cancel_work_sync(&ca->io_error_work);
 546
 547         cancel_work_sync(&c->read_only_work);
 548
 549         for (i = 0; i < c->sb.nr_devices; i++)
 550                 if (c->devs[i])
 551                         bch2_free_super(&c->devs[i]->disk_sb);
 552 }
 553
 554 void bch2_fs_free(struct bch_fs *c)
 555 {
 556         unsigned i;
 557
 558         mutex_lock(&bch_fs_list_lock);
 559         list_del(&c->list);
 560         mutex_unlock(&bch_fs_list_lock);
 561
 562         closure_sync(&c->cl);
 563         closure_debug_destroy(&c->cl);
 564
 565         for (i = 0; i < c->sb.nr_devices; i++)
 566                 if (c->devs[i])
 567                         bch2_dev_free(rcu_dereference_protected(c->devs[i], 1));
 568
 569         bch_verbose(c, "shutdown complete");
 570
 571         kobject_put(&c->kobj);
 572 }
 573
 574 void bch2_fs_stop(struct bch_fs *c)
 575 {
 576         __bch2_fs_stop(c);
 577         bch2_fs_free(c);
 578 }
 579
 580 static int bch2_fs_online(struct bch_fs *c)
 581 {
 582         struct bch_dev *ca;
 583         unsigned i;
 584         int ret = 0;
 585
 586         lockdep_assert_held(&bch_fs_list_lock);
 587
 588         if (__bch2_uuid_to_fs(c->sb.uuid)) {
 589                 bch_err(c, "filesystem UUID already open");
 590                 return -EINVAL;
 591         }
 592
 593         ret = bch2_fs_chardev_init(c);
 594         if (ret) {
 595                 bch_err(c, "error creating character device");
 596                 return ret;
 597         }
 598
 599         bch2_fs_debug_init(c);
 600
 601         ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
 602             kobject_add(&c->internal, &c->kobj, "internal") ?:
 603             kobject_add(&c->opts_dir, &c->kobj, "options") ?:
 604             kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
 605             kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
 606             bch2_opts_create_sysfs_files(&c->opts_dir);
 607         if (ret) {
 608                 bch_err(c, "error creating sysfs objects");
 609                 return ret;
 610         }
 611
 612         down_write(&c->state_lock);
 613
 614         for_each_member_device(ca, c, i) {
 615                 ret = bch2_dev_sysfs_online(c, ca);
 616                 if (ret) {
 617                         bch_err(c, "error creating sysfs objects");
 618                         percpu_ref_put(&ca->ref);
 619                         goto err;
 620                 }
 621         }
 622
 623         BUG_ON(!list_empty(&c->list));
 624         list_add(&c->list, &bch_fs_list);
 625 err:
 626         up_write(&c->state_lock);
 627         return ret;
 628 }
 629
 630 static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
 631 {
 632         struct bch_sb_field_members *mi;
 633         struct bch_fs *c;
 634         struct printbuf name = PRINTBUF;
 635         unsigned i, iter_size;
 636         int ret = 0;
 637
 638         pr_verbose_init(opts, "");
 639
 640         c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
 641         if (!c) {
 642                 c = ERR_PTR(-ENOMEM);
 643                 goto out;
 644         }
 645
 646         __module_get(THIS_MODULE);
 647
 648         closure_init(&c->cl, NULL);
 649
 650         c->kobj.kset = bcachefs_kset;
 651         kobject_init(&c->kobj, &bch2_fs_ktype);
 652         kobject_init(&c->internal, &bch2_fs_internal_ktype);
 653         kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
 654         kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
 655         kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
 656
 657         c->minor                = -1;
 658         c->disk_sb.fs_sb        = true;
 659
 660         init_rwsem(&c->state_lock);
 661         mutex_init(&c->sb_lock);
 662         mutex_init(&c->replicas_gc_lock);
 663         mutex_init(&c->btree_root_lock);
 664         INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
 665
 666         init_rwsem(&c->gc_lock);
 667         mutex_init(&c->gc_gens_lock);
 668
 669         for (i = 0; i < BCH_TIME_STAT_NR; i++)
 670                 bch2_time_stats_init(&c->times[i]);
 671
 672         bch2_fs_copygc_init(c);
 673         bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
 674         bch2_fs_allocator_background_init(c);
 675         bch2_fs_allocator_foreground_init(c);
 676         bch2_fs_rebalance_init(c);
 677         bch2_fs_quota_init(c);
 678         bch2_fs_ec_init_early(c);
 679
 680         INIT_LIST_HEAD(&c->list);
 681
 682         mutex_init(&c->usage_scratch_lock);
 683
 684         mutex_init(&c->bio_bounce_pages_lock);
 685         mutex_init(&c->snapshot_table_lock);
 686
 687         spin_lock_init(&c->btree_write_error_lock);
 688
 689         INIT_WORK(&c->journal_seq_blacklist_gc_work,
 690                   bch2_blacklist_entries_gc);
 691
 692         INIT_LIST_HEAD(&c->journal_iters);
 693
 694         INIT_LIST_HEAD(&c->fsck_errors);
 695         mutex_init(&c->fsck_error_lock);
 696
 697         INIT_LIST_HEAD(&c->ec_stripe_head_list);
 698         mutex_init(&c->ec_stripe_head_lock);
 699
 700         INIT_LIST_HEAD(&c->ec_stripe_new_list);
 701         mutex_init(&c->ec_stripe_new_lock);
 702
 703         INIT_LIST_HEAD(&c->data_progress_list);
 704         mutex_init(&c->data_progress_lock);
 705
 706         spin_lock_init(&c->ec_stripes_heap_lock);
 707
 708         seqcount_init(&c->gc_pos_lock);
 709
 710         seqcount_init(&c->usage_lock);
 711
 712         sema_init(&c->io_in_flight, 128);
 713
 714         c->copy_gc_enabled              = 1;
 715         c->rebalance.enabled            = 1;
 716         c->promote_whole_extents        = true;
 717
 718         c->journal.flush_write_time     = &c->times[BCH_TIME_journal_flush_write];
 719         c->journal.noflush_write_time   = &c->times[BCH_TIME_journal_noflush_write];
 720         c->journal.blocked_time         = &c->times[BCH_TIME_blocked_journal];
 721         c->journal.flush_seq_time       = &c->times[BCH_TIME_journal_flush_seq];
 722
 723         bch2_fs_btree_cache_init_early(&c->btree_cache);
 724
 725         mutex_init(&c->sectors_available_lock);
 726
 727         ret = percpu_init_rwsem(&c->mark_lock);
 728         if (ret)
 729                 goto err;
 730
 731         mutex_lock(&c->sb_lock);
 732         ret = bch2_sb_to_fs(c, sb);
 733         mutex_unlock(&c->sb_lock);
 734
 735         if (ret)
 736                 goto err;
 737
 738         pr_uuid(&name, c->sb.user_uuid.b);
 739         strscpy(c->name, name.buf, sizeof(c->name));
 740         printbuf_exit(&name);
 741
 742         ret = name.allocation_failure ? -ENOMEM : 0;
 743         if (ret)
 744                 goto err;
 745
 746         /* Compat: */
 747         if (sb->version <= bcachefs_metadata_version_inode_v2 &&
 748             !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
 749                 SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 750
 751         if (sb->version <= bcachefs_metadata_version_inode_v2 &&
 752             !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 753                 SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
 754
 755         c->opts = bch2_opts_default;
 756         ret = bch2_opts_from_sb(&c->opts, sb);
 757         if (ret)
 758                 goto err;
 759
 760         bch2_opts_apply(&c->opts, opts);
 761
 762         c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
 763         if (c->opts.inodes_use_key_cache)
 764                 c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
 765
 766         c->block_bits           = ilog2(block_sectors(c));
 767         c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
 768
 769         if (bch2_fs_init_fault("fs_alloc")) {
 770                 bch_err(c, "fs_alloc fault injected");
 771                 ret = -EFAULT;
 772                 goto err;
 773         }
 774
 775         iter_size = sizeof(struct sort_iter) +
 776                 (btree_blocks(c) + 1) * 2 *
 777                 sizeof(struct sort_iter_set);
 778
 779         c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
 780
 781         if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
 782                                 WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) ||
 783             !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
 784                                 WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
 785             !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
 786                                 WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
 787             !(c->io_complete_wq = alloc_workqueue("bcachefs_io",
 788                                 WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 1)) ||
 789 #ifndef BCH_WRITE_REF_DEBUG
 790             percpu_ref_init(&c->writes, bch2_writes_disabled,
 791                             PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
 792 #endif
 793             mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
 794             bioset_init(&c->btree_bio, 1,
 795                         max(offsetof(struct btree_read_bio, bio),
 796                             offsetof(struct btree_write_bio, wbio.bio)),
 797                         BIOSET_NEED_BVECS) ||
 798             !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
 799             !(c->online_reserved = alloc_percpu(u64)) ||
 800             !(c->btree_paths_bufs = alloc_percpu(struct btree_path_buf)) ||
 801             mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
 802                                         btree_bytes(c)) ||
 803             mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
 804             !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
 805                                               sizeof(u64), GFP_KERNEL))) {
 806                 ret = -ENOMEM;
 807                 goto err;
 808         }
 809
 810         ret = bch2_fs_counters_init(c) ?:
 811             bch2_io_clock_init(&c->io_clock[READ]) ?:
 812             bch2_io_clock_init(&c->io_clock[WRITE]) ?:
 813             bch2_fs_journal_init(&c->journal) ?:
 814             bch2_fs_replicas_init(c) ?:
 815             bch2_fs_btree_cache_init(c) ?:
 816             bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
 817             bch2_fs_btree_iter_init(c) ?:
 818             bch2_fs_btree_interior_update_init(c) ?:
 819             bch2_fs_buckets_waiting_for_journal_init(c) ?:
 820             bch2_fs_subvolumes_init(c) ?:
 821             bch2_fs_io_init(c) ?:
 822             bch2_fs_nocow_locking_init(c) ?:
 823             bch2_fs_encryption_init(c) ?:
 824             bch2_fs_compress_init(c) ?:
 825             bch2_fs_ec_init(c) ?:
 826             bch2_fs_fsio_init(c);
 827         if (ret)
 828                 goto err;
 829
 830         mi = bch2_sb_get_members(c->disk_sb.sb);
 831         for (i = 0; i < c->sb.nr_devices; i++)
 832                 if (bch2_dev_exists(c->disk_sb.sb, mi, i) &&
 833                     bch2_dev_alloc(c, i)) {
 834                         ret = -EEXIST;
 835                         goto err;
 836                 }
 837
 838         bch2_journal_entry_res_resize(&c->journal,
 839                         &c->btree_root_journal_res,
 840                         BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
 841         bch2_dev_usage_journal_reserve(c);
 842         bch2_journal_entry_res_resize(&c->journal,
 843                         &c->clock_journal_res,
 844                         (sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
 845
 846         mutex_lock(&bch_fs_list_lock);
 847         ret = bch2_fs_online(c);
 848         mutex_unlock(&bch_fs_list_lock);
 849
 850         if (ret)
 851                 goto err;
 852 out:
 853         pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
 854         return c;
 855 err:
 856         bch2_fs_free(c);
 857         c = ERR_PTR(ret);
 858         goto out;
 859 }
 860
 861 noinline_for_stack
 862 static void print_mount_opts(struct bch_fs *c)
 863 {
 864         enum bch_opt_id i;
 865         struct printbuf p = PRINTBUF;
 866         bool first = true;
 867
 868         prt_printf(&p, "mounted version=%s", bch2_metadata_versions[c->sb.version]);
 869
 870         if (c->opts.read_only) {
 871                 prt_str(&p, " opts=");
 872                 first = false;
 873                 prt_printf(&p, "ro");
 874         }
 875
 876         for (i = 0; i < bch2_opts_nr; i++) {
 877                 const struct bch_option *opt = &bch2_opt_table[i];
 878                 u64 v = bch2_opt_get_by_id(&c->opts, i);
 879
 880                 if (!(opt->flags & OPT_MOUNT))
 881                         continue;
 882
 883                 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
 884                         continue;
 885
 886                 prt_str(&p, first ? " opts=" : ",");
 887                 first = false;
 888                 bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);
 889         }
 890
 891         bch_info(c, "%s", p.buf);
 892         printbuf_exit(&p);
 893 }
 894
 895 int bch2_fs_start(struct bch_fs *c)
 896 {
 897         struct bch_sb_field_members *mi;
 898         struct bch_dev *ca;
 899         time64_t now = ktime_get_real_seconds();
 900         unsigned i;
 901         int ret;
 902
 903         down_write(&c->state_lock);
 904
 905         BUG_ON(test_bit(BCH_FS_STARTED, &c->flags));
 906
 907         mutex_lock(&c->sb_lock);
 908
 909         for_each_online_member(ca, c, i)
 910                 bch2_sb_from_fs(c, ca);
 911
 912         mi = bch2_sb_get_members(c->disk_sb.sb);
 913         for_each_online_member(ca, c, i)
 914                 mi->members[ca->dev_idx].last_mount = cpu_to_le64(now);
 915
 916         mutex_unlock(&c->sb_lock);
 917
 918         for_each_rw_member(ca, c, i)
 919                 bch2_dev_allocator_add(c, ca);
 920         bch2_recalc_capacity(c);
 921
 922         for (i = 0; i < BCH_TRANSACTIONS_NR; i++) {
 923                 mutex_lock(&c->btree_transaction_stats[i].lock);
 924                 bch2_time_stats_init(&c->btree_transaction_stats[i].lock_hold_times);
 925                 mutex_unlock(&c->btree_transaction_stats[i].lock);
 926         }
 927
 928         ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
 929                 ? bch2_fs_recovery(c)
 930                 : bch2_fs_initialize(c);
 931         if (ret)
 932                 goto err;
 933
 934         ret = bch2_opts_check_may_set(c);
 935         if (ret)
 936                 goto err;
 937
 938         if (bch2_fs_init_fault("fs_start")) {
 939                 bch_err(c, "fs_start fault injected");
 940                 ret = -EINVAL;
 941                 goto err;
 942         }
 943
 944         set_bit(BCH_FS_STARTED, &c->flags);
 945
 946         if (c->opts.read_only || c->opts.nochanges) {
 947                 bch2_fs_read_only(c);
 948         } else {
 949                 ret = !test_bit(BCH_FS_RW, &c->flags)
 950                         ? bch2_fs_read_write(c)
 951                         : bch2_fs_read_write_late(c);
 952                 if (ret)
 953                         goto err;
 954         }
 955
 956         print_mount_opts(c);
 957         ret = 0;
 958 out:
 959         up_write(&c->state_lock);
 960         return ret;
 961 err:
 962         bch_err(c, "error starting filesystem: %s", bch2_err_str(ret));
 963         goto out;
 964 }
 965
 966 static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
 967 {
 968         struct bch_sb_field_members *sb_mi;
 969
 970         sb_mi = bch2_sb_get_members(sb);
 971         if (!sb_mi)
 972                 return -BCH_ERR_member_info_missing;
 973
 974         if (le16_to_cpu(sb->block_size) != block_sectors(c))
 975                 return -BCH_ERR_mismatched_block_size;
 976
 977         if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <
 978             BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
 979                 return -BCH_ERR_bucket_size_too_small;
 980
 981         return 0;
 982 }
 983
 984 static int bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
 985 {
 986         struct bch_sb *newest =
 987                 le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
 988         struct bch_sb_field_members *mi = bch2_sb_get_members(newest);
 989
 990         if (uuid_le_cmp(fs->uuid, sb->uuid))
 991                 return -BCH_ERR_device_not_a_member_of_filesystem;
 992
 993         if (!bch2_dev_exists(newest, mi, sb->dev_idx))
 994                 return -BCH_ERR_device_has_been_removed;
 995
 996         if (fs->block_size != sb->block_size)
 997                 return -BCH_ERR_mismatched_block_size;
 998
 999         return 0;
1000 }
1001
1002 /* Device startup/shutdown: */
1003
1004 static void bch2_dev_release(struct kobject *kobj)
1005 {
1006         struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
1007
1008         kfree(ca);
1009 }
1010
1011 static void bch2_dev_free(struct bch_dev *ca)
1012 {
1013         cancel_work_sync(&ca->io_error_work);
1014
1015         if (ca->kobj.state_in_sysfs &&
1016             ca->disk_sb.bdev)
1017                 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1018
1019         if (ca->kobj.state_in_sysfs)
1020                 kobject_del(&ca->kobj);
1021
1022         bch2_free_super(&ca->disk_sb);
1023         bch2_dev_journal_exit(ca);
1024
1025         free_percpu(ca->io_done);
1026         bioset_exit(&ca->replica_set);
1027         bch2_dev_buckets_free(ca);
1028         free_page((unsigned long) ca->sb_read_scratch);
1029
1030         bch2_time_stats_exit(&ca->io_latency[WRITE]);
1031         bch2_time_stats_exit(&ca->io_latency[READ]);
1032
1033         percpu_ref_exit(&ca->io_ref);
1034         percpu_ref_exit(&ca->ref);
1035         kobject_put(&ca->kobj);
1036 }
1037
1038 static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
1039 {
1040
1041         lockdep_assert_held(&c->state_lock);
1042
1043         if (percpu_ref_is_zero(&ca->io_ref))
1044                 return;
1045
1046         __bch2_dev_read_only(c, ca);
1047
1048         reinit_completion(&ca->io_ref_completion);
1049         percpu_ref_kill(&ca->io_ref);
1050         wait_for_completion(&ca->io_ref_completion);
1051
1052         if (ca->kobj.state_in_sysfs) {
1053                 sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
1054                 sysfs_remove_link(&ca->kobj, "block");
1055         }
1056
1057         bch2_free_super(&ca->disk_sb);
1058         bch2_dev_journal_exit(ca);
1059 }
1060
1061 static void bch2_dev_ref_complete(struct percpu_ref *ref)
1062 {
1063         struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
1064
1065         complete(&ca->ref_completion);
1066 }
1067
1068 static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
1069 {
1070         struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
1071
1072         complete(&ca->io_ref_completion);
1073 }
1074
1075 static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
1076 {
1077         int ret;
1078
1079         if (!c->kobj.state_in_sysfs)
1080                 return 0;
1081
1082         if (!ca->kobj.state_in_sysfs) {
1083                 ret = kobject_add(&ca->kobj, &c->kobj,
1084                                   "dev-%u", ca->dev_idx);
1085                 if (ret)
1086                         return ret;
1087         }
1088
1089         if (ca->disk_sb.bdev) {
1090                 struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
1091
1092                 ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
1093                 if (ret)
1094                         return ret;
1095
1096                 ret = sysfs_create_link(&ca->kobj, block, "block");
1097                 if (ret)
1098                         return ret;
1099         }
1100
1101         return 0;
1102 }
1103
1104 static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
1105                                         struct bch_member *member)
1106 {
1107         struct bch_dev *ca;
1108
1109         ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1110         if (!ca)
1111                 return NULL;
1112
1113         kobject_init(&ca->kobj, &bch2_dev_ktype);
1114         init_completion(&ca->ref_completion);
1115         init_completion(&ca->io_ref_completion);
1116
1117         init_rwsem(&ca->bucket_lock);
1118
1119         INIT_WORK(&ca->io_error_work, bch2_io_error_work);
1120
1121         bch2_time_stats_init(&ca->io_latency[READ]);
1122         bch2_time_stats_init(&ca->io_latency[WRITE]);
1123
1124         ca->mi = bch2_mi_to_cpu(member);
1125         ca->uuid = member->uuid;
1126
1127         ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
1128                              ca->mi.bucket_size / btree_sectors(c));
1129
1130         if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
1131                             0, GFP_KERNEL) ||
1132             percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
1133                             PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
1134             !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
1135             bch2_dev_buckets_alloc(c, ca) ||
1136             bioset_init(&ca->replica_set, 4,
1137                         offsetof(struct bch_write_bio, bio), 0) ||
1138             !(ca->io_done       = alloc_percpu(*ca->io_done)))
1139                 goto err;
1140
1141         return ca;
1142 err:
1143         bch2_dev_free(ca);
1144         return NULL;
1145 }
1146
1147 static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
1148                             unsigned dev_idx)
1149 {
1150         ca->dev_idx = dev_idx;
1151         __set_bit(ca->dev_idx, ca->self.d);
1152         scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
1153
1154         ca->fs = c;
1155         rcu_assign_pointer(c->devs[ca->dev_idx], ca);
1156
1157         if (bch2_dev_sysfs_online(c, ca))
1158                 pr_warn("error creating sysfs objects");
1159 }
1160
1161 static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
1162 {
1163         struct bch_member *member =
1164                 bch2_sb_get_members(c->disk_sb.sb)->members + dev_idx;
1165         struct bch_dev *ca = NULL;
1166         int ret = 0;
1167
1168         pr_verbose_init(c->opts, "");
1169
1170         if (bch2_fs_init_fault("dev_alloc"))
1171                 goto err;
1172
1173         ca = __bch2_dev_alloc(c, member);
1174         if (!ca)
1175                 goto err;
1176
1177         ca->fs = c;
1178
1179         bch2_dev_attach(c, ca, dev_idx);
1180 out:
1181         pr_verbose_init(c->opts, "ret %i", ret);
1182         return ret;
1183 err:
1184         if (ca)
1185                 bch2_dev_free(ca);
1186         ret = -ENOMEM;
1187         goto out;
1188 }
1189
1190 static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
1191 {
1192         unsigned ret;
1193
1194         if (bch2_dev_is_online(ca)) {
1195                 bch_err(ca, "already have device online in slot %u",
1196                         sb->sb->dev_idx);
1197                 return -BCH_ERR_device_already_online;
1198         }
1199
1200         if (get_capacity(sb->bdev->bd_disk) <
1201             ca->mi.bucket_size * ca->mi.nbuckets) {
1202                 bch_err(ca, "cannot online: device too small");
1203                 return -BCH_ERR_device_size_too_small;
1204         }
1205
1206         BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
1207
1208         ret = bch2_dev_journal_init(ca, sb->sb);
1209         if (ret)
1210                 return ret;
1211
1212         /* Commit: */
1213         ca->disk_sb = *sb;
1214         if (sb->mode & FMODE_EXCL)
1215                 ca->disk_sb.bdev->bd_holder = ca;
1216         memset(sb, 0, sizeof(*sb));
1217
1218         ca->dev = ca->disk_sb.bdev->bd_dev;
1219
1220         percpu_ref_reinit(&ca->io_ref);
1221
1222         return 0;
1223 }
1224
1225 static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
1226 {
1227         struct bch_dev *ca;
1228         int ret;
1229
1230         lockdep_assert_held(&c->state_lock);
1231
1232         if (le64_to_cpu(sb->sb->seq) >
1233             le64_to_cpu(c->disk_sb.sb->seq))
1234                 bch2_sb_to_fs(c, sb->sb);
1235
1236         BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
1237                !c->devs[sb->sb->dev_idx]);
1238
1239         ca = bch_dev_locked(c, sb->sb->dev_idx);
1240
1241         ret = __bch2_dev_attach_bdev(ca, sb);
1242         if (ret)
1243                 return ret;
1244
1245         bch2_dev_sysfs_online(c, ca);
1246
1247         if (c->sb.nr_devices == 1)
1248                 snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev);
1249         snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev);
1250
1251         rebalance_wakeup(c);
1252         return 0;
1253 }
1254
1255 /* Device management: */
1256
1257 /*
1258  * Note: this function is also used by the error paths - when a particular
1259  * device sees an error, we call it to determine whether we can just set the
1260  * device RO, or - if this function returns false - we'll set the whole
1261  * filesystem RO:
1262  *
1263  * XXX: maybe we should be more explicit about whether we're changing state
1264  * because we got an error or what have you?
1265  */
1266 bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
1267                             enum bch_member_state new_state, int flags)
1268 {
1269         struct bch_devs_mask new_online_devs;
1270         struct bch_dev *ca2;
1271         int i, nr_rw = 0, required;
1272
1273         lockdep_assert_held(&c->state_lock);
1274
1275         switch (new_state) {
1276         case BCH_MEMBER_STATE_rw:
1277                 return true;
1278         case BCH_MEMBER_STATE_ro:
1279                 if (ca->mi.state != BCH_MEMBER_STATE_rw)
1280                         return true;
1281
1282                 /* do we have enough devices to write to?  */
1283                 for_each_member_device(ca2, c, i)
1284                         if (ca2 != ca)
1285                                 nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
1286
1287                 required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
1288                                ? c->opts.metadata_replicas
1289                                : c->opts.metadata_replicas_required,
1290                                !(flags & BCH_FORCE_IF_DATA_DEGRADED)
1291                                ? c->opts.data_replicas
1292                                : c->opts.data_replicas_required);
1293
1294                 return nr_rw >= required;
1295         case BCH_MEMBER_STATE_failed:
1296         case BCH_MEMBER_STATE_spare:
1297                 if (ca->mi.state != BCH_MEMBER_STATE_rw &&
1298                     ca->mi.state != BCH_MEMBER_STATE_ro)
1299                         return true;
1300
1301                 /* do we have enough devices to read from?  */
1302                 new_online_devs = bch2_online_devs(c);
1303                 __clear_bit(ca->dev_idx, new_online_devs.d);
1304
1305                 return bch2_have_enough_devs(c, new_online_devs, flags, false);
1306         default:
1307                 BUG();
1308         }
1309 }
1310
1311 static bool bch2_fs_may_start(struct bch_fs *c)
1312 {
1313         struct bch_sb_field_members *mi;
1314         struct bch_dev *ca;
1315         unsigned i, flags = 0;
1316
1317         if (c->opts.very_degraded)
1318                 flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
1319
1320         if (c->opts.degraded)
1321                 flags |= BCH_FORCE_IF_DEGRADED;
1322
1323         if (!c->opts.degraded &&
1324             !c->opts.very_degraded) {
1325                 mutex_lock(&c->sb_lock);
1326                 mi = bch2_sb_get_members(c->disk_sb.sb);
1327
1328                 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
1329                         if (!bch2_dev_exists(c->disk_sb.sb, mi, i))
1330                                 continue;
1331
1332                         ca = bch_dev_locked(c, i);
1333
1334                         if (!bch2_dev_is_online(ca) &&
1335                             (ca->mi.state == BCH_MEMBER_STATE_rw ||
1336                              ca->mi.state == BCH_MEMBER_STATE_ro)) {
1337                                 mutex_unlock(&c->sb_lock);
1338                                 return false;
1339                         }
1340                 }
1341                 mutex_unlock(&c->sb_lock);
1342         }
1343
1344         return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
1345 }
1346
1347 static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
1348 {
1349         /*
1350          * The allocator thread itself allocates btree nodes, so stop it first:
1351          */
1352         bch2_dev_allocator_remove(c, ca);
1353         bch2_dev_journal_stop(&c->journal, ca);
1354 }
1355
1356 static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
1357 {
1358         lockdep_assert_held(&c->state_lock);
1359
1360         BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
1361
1362         bch2_dev_allocator_add(c, ca);
1363         bch2_recalc_capacity(c);
1364 }
1365
1366 int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1367                          enum bch_member_state new_state, int flags)
1368 {
1369         struct bch_sb_field_members *mi;
1370         int ret = 0;
1371
1372         if (ca->mi.state == new_state)
1373                 return 0;
1374
1375         if (!bch2_dev_state_allowed(c, ca, new_state, flags))
1376                 return -BCH_ERR_device_state_not_allowed;
1377
1378         if (new_state != BCH_MEMBER_STATE_rw)
1379                 __bch2_dev_read_only(c, ca);
1380
1381         bch_notice(ca, "%s", bch2_member_states[new_state]);
1382
1383         mutex_lock(&c->sb_lock);
1384         mi = bch2_sb_get_members(c->disk_sb.sb);
1385         SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state);
1386         bch2_write_super(c);
1387         mutex_unlock(&c->sb_lock);
1388
1389         if (new_state == BCH_MEMBER_STATE_rw)
1390                 __bch2_dev_read_write(c, ca);
1391
1392         rebalance_wakeup(c);
1393
1394         return ret;
1395 }
1396
1397 int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
1398                        enum bch_member_state new_state, int flags)
1399 {
1400         int ret;
1401
1402         down_write(&c->state_lock);
1403         ret = __bch2_dev_set_state(c, ca, new_state, flags);
1404         up_write(&c->state_lock);
1405
1406         return ret;
1407 }
1408
1409 /* Device add/removal: */
1410
1411 static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
1412 {
1413         struct bpos start       = POS(ca->dev_idx, 0);
1414         struct bpos end         = POS(ca->dev_idx, U64_MAX);
1415         int ret;
1416
1417         /*
1418          * We clear the LRU and need_discard btrees first so that we don't race
1419          * with bch2_do_invalidates() and bch2_do_discards()
1420          */
1421         ret =   bch2_btree_delete_range(c, BTREE_ID_lru, start, end,
1422                                         BTREE_TRIGGER_NORUN, NULL) ?:
1423                 bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end,
1424                                         BTREE_TRIGGER_NORUN, NULL) ?:
1425                 bch2_btree_delete_range(c, BTREE_ID_freespace, start, end,
1426                                         BTREE_TRIGGER_NORUN, NULL) ?:
1427                 bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end,
1428                                         BTREE_TRIGGER_NORUN, NULL) ?:
1429                 bch2_btree_delete_range(c, BTREE_ID_alloc, start, end,
1430                                         BTREE_TRIGGER_NORUN, NULL);
1431         if (ret)
1432                 bch_err(c, "error removing dev alloc info: %s", bch2_err_str(ret));
1433
1434         return ret;
1435 }
1436
1437 int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
1438 {
1439         struct bch_sb_field_members *mi;
1440         unsigned dev_idx = ca->dev_idx, data;
1441         int ret;
1442
1443         down_write(&c->state_lock);
1444
1445         /*
1446          * We consume a reference to ca->ref, regardless of whether we succeed
1447          * or fail:
1448          */
1449         percpu_ref_put(&ca->ref);
1450
1451         if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1452                 bch_err(ca, "Cannot remove without losing data");
1453                 ret = -BCH_ERR_device_state_not_allowed;
1454                 goto err;
1455         }
1456
1457         __bch2_dev_read_only(c, ca);
1458
1459         ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
1460         if (ret) {
1461                 bch_err(ca, "Remove failed: error dropping data: %s", bch2_err_str(ret));
1462                 goto err;
1463         }
1464
1465         ret = bch2_dev_remove_alloc(c, ca);
1466         if (ret) {
1467                 bch_err(ca, "Remove failed, error deleting alloc info");
1468                 goto err;
1469         }
1470
1471         ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
1472         if (ret) {
1473                 bch_err(ca, "Remove failed: error flushing journal: %s", bch2_err_str(ret));
1474                 goto err;
1475         }
1476
1477         ret = bch2_journal_flush(&c->journal);
1478         if (ret) {
1479                 bch_err(ca, "Remove failed, journal error");
1480                 goto err;
1481         }
1482
1483         ret = bch2_replicas_gc2(c);
1484         if (ret) {
1485                 bch_err(ca, "Remove failed: error from replicas gc: %s", bch2_err_str(ret));
1486                 goto err;
1487         }
1488
1489         data = bch2_dev_has_data(c, ca);
1490         if (data) {
1491                 struct printbuf data_has = PRINTBUF;
1492
1493                 prt_bitflags(&data_has, bch2_data_types, data);
1494                 bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
1495                 printbuf_exit(&data_has);
1496                 ret = -EBUSY;
1497                 goto err;
1498         }
1499
1500         __bch2_dev_offline(c, ca);
1501
1502         mutex_lock(&c->sb_lock);
1503         rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
1504         mutex_unlock(&c->sb_lock);
1505
1506         percpu_ref_kill(&ca->ref);
1507         wait_for_completion(&ca->ref_completion);
1508
1509         bch2_dev_free(ca);
1510
1511         /*
1512          * Free this device's slot in the bch_member array - all pointers to
1513          * this device must be gone:
1514          */
1515         mutex_lock(&c->sb_lock);
1516         mi = bch2_sb_get_members(c->disk_sb.sb);
1517         memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid));
1518
1519         bch2_write_super(c);
1520
1521         mutex_unlock(&c->sb_lock);
1522         up_write(&c->state_lock);
1523
1524         bch2_dev_usage_journal_reserve(c);
1525         return 0;
1526 err:
1527         if (ca->mi.state == BCH_MEMBER_STATE_rw &&
1528             !percpu_ref_is_zero(&ca->io_ref))
1529                 __bch2_dev_read_write(c, ca);
1530         up_write(&c->state_lock);
1531         return ret;
1532 }
1533
1534 /* Add new device to running filesystem: */
1535 int bch2_dev_add(struct bch_fs *c, const char *path)
1536 {
1537         struct bch_opts opts = bch2_opts_empty();
1538         struct bch_sb_handle sb;
1539         struct bch_dev *ca = NULL;
1540         struct bch_sb_field_members *mi;
1541         struct bch_member dev_mi;
1542         unsigned dev_idx, nr_devices, u64s;
1543         struct printbuf errbuf = PRINTBUF;
1544         struct printbuf label = PRINTBUF;
1545         int ret;
1546
1547         ret = bch2_read_super(path, &opts, &sb);
1548         if (ret) {
1549                 bch_err(c, "device add error: error reading super: %s", bch2_err_str(ret));
1550                 goto err;
1551         }
1552
1553         dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx];
1554
1555         if (BCH_MEMBER_GROUP(&dev_mi)) {
1556                 bch2_disk_path_to_text(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
1557                 if (label.allocation_failure) {
1558                         ret = -ENOMEM;
1559                         goto err;
1560                 }
1561         }
1562
1563         ret = bch2_dev_may_add(sb.sb, c);
1564         if (ret) {
1565                 bch_err(c, "device add error: %s", bch2_err_str(ret));
1566                 goto err;
1567         }
1568
1569         ca = __bch2_dev_alloc(c, &dev_mi);
1570         if (!ca) {
1571                 bch2_free_super(&sb);
1572                 ret = -ENOMEM;
1573                 goto err;
1574         }
1575
1576         bch2_dev_usage_init(ca);
1577
1578         ret = __bch2_dev_attach_bdev(ca, &sb);
1579         if (ret) {
1580                 bch2_dev_free(ca);
1581                 goto err;
1582         }
1583
1584         ret = bch2_dev_journal_alloc(ca);
1585         if (ret) {
1586                 bch_err(c, "device add error: journal alloc failed");
1587                 goto err;
1588         }
1589
1590         down_write(&c->state_lock);
1591         mutex_lock(&c->sb_lock);
1592
1593         ret = bch2_sb_from_fs(c, ca);
1594         if (ret) {
1595                 bch_err(c, "device add error: new device superblock too small");
1596                 goto err_unlock;
1597         }
1598
1599         mi = bch2_sb_get_members(ca->disk_sb.sb);
1600
1601         if (!bch2_sb_resize_members(&ca->disk_sb,
1602                                 le32_to_cpu(mi->field.u64s) +
1603                                 sizeof(dev_mi) / sizeof(u64))) {
1604                 bch_err(c, "device add error: new device superblock too small");
1605                 ret = -BCH_ERR_ENOSPC_sb_members;
1606                 goto err_unlock;
1607         }
1608
1609         if (dynamic_fault("bcachefs:add:no_slot"))
1610                 goto no_slot;
1611
1612         mi = bch2_sb_get_members(c->disk_sb.sb);
1613         for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
1614                 if (!bch2_dev_exists(c->disk_sb.sb, mi, dev_idx))
1615                         goto have_slot;
1616 no_slot:
1617         bch_err(c, "device add error: already have maximum number of devices");
1618         ret = -BCH_ERR_ENOSPC_sb_members;
1619         goto err_unlock;
1620
1621 have_slot:
1622         nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
1623         u64s = (sizeof(struct bch_sb_field_members) +
1624                 sizeof(struct bch_member) * nr_devices) / sizeof(u64);
1625
1626         mi = bch2_sb_resize_members(&c->disk_sb, u64s);
1627         if (!mi) {
1628                 bch_err(c, "device add error: no room in superblock for member info");
1629                 ret = -BCH_ERR_ENOSPC_sb_members;
1630                 goto err_unlock;
1631         }
1632
1633         /* success: */
1634
1635         mi->members[dev_idx] = dev_mi;
1636         mi->members[dev_idx].last_mount = cpu_to_le64(ktime_get_real_seconds());
1637         c->disk_sb.sb->nr_devices       = nr_devices;
1638
1639         ca->disk_sb.sb->dev_idx = dev_idx;
1640         bch2_dev_attach(c, ca, dev_idx);
1641
1642         if (BCH_MEMBER_GROUP(&dev_mi)) {
1643                 ret = __bch2_dev_group_set(c, ca, label.buf);
1644                 if (ret) {
1645                         bch_err(c, "device add error: error setting label");
1646                         goto err_unlock;
1647                 }
1648         }
1649
1650         bch2_write_super(c);
1651         mutex_unlock(&c->sb_lock);
1652
1653         bch2_dev_usage_journal_reserve(c);
1654
1655         ret = bch2_trans_mark_dev_sb(c, ca);
1656         if (ret) {
1657                 bch_err(c, "device add error: error marking new superblock: %s", bch2_err_str(ret));
1658                 goto err_late;
1659         }
1660
1661         ret = bch2_fs_freespace_init(c);
1662         if (ret) {
1663                 bch_err(c, "device add error: error initializing free space: %s", bch2_err_str(ret));
1664                 goto err_late;
1665         }
1666
1667         ca->new_fs_bucket_idx = 0;
1668
1669         if (ca->mi.state == BCH_MEMBER_STATE_rw)
1670                 __bch2_dev_read_write(c, ca);
1671
1672         up_write(&c->state_lock);
1673         return 0;
1674
1675 err_unlock:
1676         mutex_unlock(&c->sb_lock);
1677         up_write(&c->state_lock);
1678 err:
1679         if (ca)
1680                 bch2_dev_free(ca);
1681         bch2_free_super(&sb);
1682         printbuf_exit(&label);
1683         printbuf_exit(&errbuf);
1684         return ret;
1685 err_late:
1686         up_write(&c->state_lock);
1687         ca = NULL;
1688         goto err;
1689 }
1690
1691 /* Hot add existing device to running filesystem: */
1692 int bch2_dev_online(struct bch_fs *c, const char *path)
1693 {
1694         struct bch_opts opts = bch2_opts_empty();
1695         struct bch_sb_handle sb = { NULL };
1696         struct bch_sb_field_members *mi;
1697         struct bch_dev *ca;
1698         unsigned dev_idx;
1699         int ret;
1700
1701         down_write(&c->state_lock);
1702
1703         ret = bch2_read_super(path, &opts, &sb);
1704         if (ret) {
1705                 up_write(&c->state_lock);
1706                 return ret;
1707         }
1708
1709         dev_idx = sb.sb->dev_idx;
1710
1711         ret = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
1712         if (ret) {
1713                 bch_err(c, "error bringing %s online: %s", path, bch2_err_str(ret));
1714                 goto err;
1715         }
1716
1717         ret = bch2_dev_attach_bdev(c, &sb);
1718         if (ret)
1719                 goto err;
1720
1721         ca = bch_dev_locked(c, dev_idx);
1722
1723         ret = bch2_trans_mark_dev_sb(c, ca);
1724         if (ret) {
1725                 bch_err(c, "error bringing %s online: error from bch2_trans_mark_dev_sb: %s",
1726                         path, bch2_err_str(ret));
1727                 goto err;
1728         }
1729
1730         if (ca->mi.state == BCH_MEMBER_STATE_rw)
1731                 __bch2_dev_read_write(c, ca);
1732
1733         mutex_lock(&c->sb_lock);
1734         mi = bch2_sb_get_members(c->disk_sb.sb);
1735
1736         mi->members[ca->dev_idx].last_mount =
1737                 cpu_to_le64(ktime_get_real_seconds());
1738
1739         bch2_write_super(c);
1740         mutex_unlock(&c->sb_lock);
1741
1742         up_write(&c->state_lock);
1743         return 0;
1744 err:
1745         up_write(&c->state_lock);
1746         bch2_free_super(&sb);
1747         return ret;
1748 }
1749
1750 int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
1751 {
1752         down_write(&c->state_lock);
1753
1754         if (!bch2_dev_is_online(ca)) {
1755                 bch_err(ca, "Already offline");
1756                 up_write(&c->state_lock);
1757                 return 0;
1758         }
1759
1760         if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
1761                 bch_err(ca, "Cannot offline required disk");
1762                 up_write(&c->state_lock);
1763                 return -BCH_ERR_device_state_not_allowed;
1764         }
1765
1766         __bch2_dev_offline(c, ca);
1767
1768         up_write(&c->state_lock);
1769         return 0;
1770 }
1771
1772 int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
1773 {
1774         struct bch_member *mi;
1775         int ret = 0;
1776
1777         down_write(&c->state_lock);
1778
1779         if (nbuckets < ca->mi.nbuckets) {
1780                 bch_err(ca, "Cannot shrink yet");
1781                 ret = -EINVAL;
1782                 goto err;
1783         }
1784
1785         if (bch2_dev_is_online(ca) &&
1786             get_capacity(ca->disk_sb.bdev->bd_disk) <
1787             ca->mi.bucket_size * nbuckets) {
1788                 bch_err(ca, "New size larger than device");
1789                 ret = -BCH_ERR_device_size_too_small;
1790                 goto err;
1791         }
1792
1793         ret = bch2_dev_buckets_resize(c, ca, nbuckets);
1794         if (ret) {
1795                 bch_err(ca, "Resize error: %s", bch2_err_str(ret));
1796                 goto err;
1797         }
1798
1799         ret = bch2_trans_mark_dev_sb(c, ca);
1800         if (ret)
1801                 goto err;
1802
1803         mutex_lock(&c->sb_lock);
1804         mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
1805         mi->nbuckets = cpu_to_le64(nbuckets);
1806
1807         bch2_write_super(c);
1808         mutex_unlock(&c->sb_lock);
1809
1810         bch2_recalc_capacity(c);
1811 err:
1812         up_write(&c->state_lock);
1813         return ret;
1814 }
1815
1816 /* return with ref on ca->ref: */
1817 struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
1818 {
1819         struct bch_dev *ca;
1820         unsigned i;
1821
1822         rcu_read_lock();
1823         for_each_member_device_rcu(ca, c, i, NULL)
1824                 if (!strcmp(name, ca->name))
1825                         goto found;
1826         ca = ERR_PTR(-ENOENT);
1827 found:
1828         rcu_read_unlock();
1829
1830         return ca;
1831 }
1832
1833 /* Filesystem open: */
1834
1835 struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
1836                             struct bch_opts opts)
1837 {
1838         struct bch_sb_handle *sb = NULL;
1839         struct bch_fs *c = NULL;
1840         struct bch_sb_field_members *mi;
1841         unsigned i, best_sb = 0;
1842         struct printbuf errbuf = PRINTBUF;
1843         int ret = 0;
1844
1845         if (!try_module_get(THIS_MODULE))
1846                 return ERR_PTR(-ENODEV);
1847
1848         pr_verbose_init(opts, "");
1849
1850         if (!nr_devices) {
1851                 ret = -EINVAL;
1852                 goto err;
1853         }
1854
1855         sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
1856         if (!sb) {
1857                 ret = -ENOMEM;
1858                 goto err;
1859         }
1860
1861         for (i = 0; i < nr_devices; i++) {
1862                 ret = bch2_read_super(devices[i], &opts, &sb[i]);
1863                 if (ret)
1864                         goto err;
1865
1866         }
1867
1868         for (i = 1; i < nr_devices; i++)
1869                 if (le64_to_cpu(sb[i].sb->seq) >
1870                     le64_to_cpu(sb[best_sb].sb->seq))
1871                         best_sb = i;
1872
1873         mi = bch2_sb_get_members(sb[best_sb].sb);
1874
1875         i = 0;
1876         while (i < nr_devices) {
1877                 if (i != best_sb &&
1878                     !bch2_dev_exists(sb[best_sb].sb, mi, sb[i].sb->dev_idx)) {
1879                         pr_info("%pg has been removed, skipping", sb[i].bdev);
1880                         bch2_free_super(&sb[i]);
1881                         array_remove_item(sb, nr_devices, i);
1882                         continue;
1883                 }
1884
1885                 ret = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
1886                 if (ret)
1887                         goto err_print;
1888                 i++;
1889         }
1890
1891         c = bch2_fs_alloc(sb[best_sb].sb, opts);
1892         if (IS_ERR(c)) {
1893                 ret = PTR_ERR(c);
1894                 goto err;
1895         }
1896
1897         down_write(&c->state_lock);
1898         for (i = 0; i < nr_devices; i++) {
1899                 ret = bch2_dev_attach_bdev(c, &sb[i]);
1900                 if (ret) {
1901                         up_write(&c->state_lock);
1902                         goto err;
1903                 }
1904         }
1905         up_write(&c->state_lock);
1906
1907         if (!bch2_fs_may_start(c)) {
1908                 ret = -BCH_ERR_insufficient_devices_to_start;
1909                 goto err_print;
1910         }
1911
1912         if (!c->opts.nostart) {
1913                 ret = bch2_fs_start(c);
1914                 if (ret)
1915                         goto err;
1916         }
1917 out:
1918         kfree(sb);
1919         printbuf_exit(&errbuf);
1920         module_put(THIS_MODULE);
1921         pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
1922         return c;
1923 err_print:
1924         pr_err("bch_fs_open err opening %s: %s",
1925                devices[0], bch2_err_str(ret));
1926 err:
1927         if (!IS_ERR_OR_NULL(c))
1928                 bch2_fs_stop(c);
1929         if (sb)
1930                 for (i = 0; i < nr_devices; i++)
1931                         bch2_free_super(&sb[i]);
1932         c = ERR_PTR(ret);
1933         goto out;
1934 }
1935
1936 /* Global interfaces/init */
1937
1938 static void bcachefs_exit(void)
1939 {
1940         bch2_debug_exit();
1941         bch2_vfs_exit();
1942         bch2_chardev_exit();
1943         bch2_btree_key_cache_exit();
1944         if (bcachefs_kset)
1945                 kset_unregister(bcachefs_kset);
1946 }
1947
1948 static int __init bcachefs_init(void)
1949 {
1950         bch2_bkey_pack_test();
1951
1952         if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
1953             bch2_btree_key_cache_init() ||
1954             bch2_chardev_init() ||
1955             bch2_vfs_init() ||
1956             bch2_debug_init())
1957                 goto err;
1958
1959         return 0;
1960 err:
1961         bcachefs_exit();
1962         return -ENOMEM;
1963 }
1964
1965 #define BCH_DEBUG_PARAM(name, description)                      \
1966         bool bch2_##name;                                       \
1967         module_param_named(name, bch2_##name, bool, 0644);      \
1968         MODULE_PARM_DESC(name, description);
1969 BCH_DEBUG_PARAMS()
1970 #undef BCH_DEBUG_PARAM
1971
1972 unsigned bch2_metadata_version = bcachefs_metadata_version_current;
1973 module_param_named(version, bch2_metadata_version, uint, 0400);
1974
1975 module_exit(bcachefs_exit);
1976 module_init(bcachefs_init);