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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "backpointers.h"
   5 #include "bkey_buf.h"
   6 #include "alloc_background.h"
   7 #include "btree_gc.h"
   8 #include "btree_journal_iter.h"
   9 #include "btree_update.h"
  10 #include "btree_update_interior.h"
  11 #include "btree_io.h"
  12 #include "buckets.h"
  13 #include "dirent.h"
  14 #include "ec.h"
  15 #include "errcode.h"
  16 #include "error.h"
  17 #include "fs-common.h"
  18 #include "fsck.h"
  19 #include "journal_io.h"
  20 #include "journal_reclaim.h"
  21 #include "journal_seq_blacklist.h"
  22 #include "lru.h"
  23 #include "logged_ops.h"
  24 #include "move.h"
  25 #include "quota.h"
  26 #include "rebalance.h"
  27 #include "recovery.h"
  28 #include "replicas.h"
  29 #include "sb-clean.h"
  30 #include "sb-downgrade.h"
  31 #include "snapshot.h"
  32 #include "subvolume.h"
  33 #include "super-io.h"
  34
  35 #include <linux/sort.h>
  36 #include <linux/stat.h>
  37
  38 #define QSTR(n) { { { .len = strlen(n) } }, .name = n }
  39
  40 static bool btree_id_is_alloc(enum btree_id id)
  41 {
  42         switch (id) {
  43         case BTREE_ID_alloc:
  44         case BTREE_ID_backpointers:
  45         case BTREE_ID_need_discard:
  46         case BTREE_ID_freespace:
  47         case BTREE_ID_bucket_gens:
  48                 return true;
  49         default:
  50                 return false;
  51         }
  52 }
  53
  54 /* for -o reconstruct_alloc: */
  55 static void drop_alloc_keys(struct journal_keys *keys)
  56 {
  57         size_t src, dst;
  58
  59         for (src = 0, dst = 0; src < keys->nr; src++)
  60                 if (!btree_id_is_alloc(keys->d[src].btree_id))
  61                         keys->d[dst++] = keys->d[src];
  62
  63         keys->nr = dst;
  64 }
  65
  66 /*
  67  * Btree node pointers have a field to stack a pointer to the in memory btree
  68  * node; we need to zero out this field when reading in btree nodes, or when
  69  * reading in keys from the journal:
  70  */
  71 static void zero_out_btree_mem_ptr(struct journal_keys *keys)
  72 {
  73         struct journal_key *i;
  74
  75         for (i = keys->d; i < keys->d + keys->nr; i++)
  76                 if (i->k->k.type == KEY_TYPE_btree_ptr_v2)
  77                         bkey_i_to_btree_ptr_v2(i->k)->v.mem_ptr = 0;
  78 }
  79
  80 /* journal replay: */
  81
  82 static void replay_now_at(struct journal *j, u64 seq)
  83 {
  84         BUG_ON(seq < j->replay_journal_seq);
  85
  86         seq = min(seq, j->replay_journal_seq_end);
  87
  88         while (j->replay_journal_seq < seq)
  89                 bch2_journal_pin_put(j, j->replay_journal_seq++);
  90 }
  91
  92 static int bch2_journal_replay_key(struct btree_trans *trans,
  93                                    struct journal_key *k)
  94 {
  95         struct btree_iter iter;
  96         unsigned iter_flags =
  97                 BTREE_ITER_INTENT|
  98                 BTREE_ITER_NOT_EXTENTS;
  99         unsigned update_flags = BTREE_TRIGGER_NORUN;
 100         int ret;
 101
 102         if (k->overwritten)
 103                 return 0;
 104
 105         trans->journal_res.seq = k->journal_seq;
 106
 107         /*
 108          * BTREE_UPDATE_KEY_CACHE_RECLAIM disables key cache lookup/update to
 109          * keep the key cache coherent with the underlying btree. Nothing
 110          * besides the allocator is doing updates yet so we don't need key cache
 111          * coherency for non-alloc btrees, and key cache fills for snapshots
 112          * btrees use BTREE_ITER_FILTER_SNAPSHOTS, which isn't available until
 113          * the snapshots recovery pass runs.
 114          */
 115         if (!k->level && k->btree_id == BTREE_ID_alloc)
 116                 iter_flags |= BTREE_ITER_CACHED;
 117         else
 118                 update_flags |= BTREE_UPDATE_KEY_CACHE_RECLAIM;
 119
 120         bch2_trans_node_iter_init(trans, &iter, k->btree_id, k->k->k.p,
 121                                   BTREE_MAX_DEPTH, k->level,
 122                                   iter_flags);
 123         ret = bch2_btree_iter_traverse(&iter);
 124         if (ret)
 125                 goto out;
 126
 127         /* Must be checked with btree locked: */
 128         if (k->overwritten)
 129                 goto out;
 130
 131         ret = bch2_trans_update(trans, &iter, k->k, update_flags);
 132 out:
 133         bch2_trans_iter_exit(trans, &iter);
 134         return ret;
 135 }
 136
 137 static int journal_sort_seq_cmp(const void *_l, const void *_r)
 138 {
 139         const struct journal_key *l = *((const struct journal_key **)_l);
 140         const struct journal_key *r = *((const struct journal_key **)_r);
 141
 142         return cmp_int(l->journal_seq, r->journal_seq);
 143 }
 144
 145 static int bch2_journal_replay(struct bch_fs *c)
 146 {
 147         struct journal_keys *keys = &c->journal_keys;
 148         DARRAY(struct journal_key *) keys_sorted = { 0 };
 149         struct journal *j = &c->journal;
 150         u64 start_seq   = c->journal_replay_seq_start;
 151         u64 end_seq     = c->journal_replay_seq_start;
 152         struct btree_trans *trans = bch2_trans_get(c);
 153         int ret = 0;
 154
 155         if (keys->nr) {
 156                 ret = bch2_journal_log_msg(c, "Starting journal replay (%zu keys in entries %llu-%llu)",
 157                                            keys->nr, start_seq, end_seq);
 158                 if (ret)
 159                         goto err;
 160         }
 161
 162         BUG_ON(!atomic_read(&keys->ref));
 163
 164         /*
 165          * First, attempt to replay keys in sorted order. This is more
 166          * efficient - better locality of btree access -  but some might fail if
 167          * that would cause a journal deadlock.
 168          */
 169         for (size_t i = 0; i < keys->nr; i++) {
 170                 cond_resched();
 171
 172                 struct journal_key *k = keys->d + i;
 173
 174                 /* Skip fastpath if we're low on space in the journal */
 175                 ret = c->journal.watermark ? -1 :
 176                         commit_do(trans, NULL, NULL,
 177                                   BCH_TRANS_COMMIT_no_enospc|
 178                                   BCH_TRANS_COMMIT_journal_reclaim|
 179                                   (!k->allocated ? BCH_TRANS_COMMIT_no_journal_res : 0),
 180                              bch2_journal_replay_key(trans, k));
 181                 BUG_ON(!ret && !k->overwritten);
 182                 if (ret) {
 183                         ret = darray_push(&keys_sorted, k);
 184                         if (ret)
 185                                 goto err;
 186                 }
 187         }
 188
 189         /*
 190          * Now, replay any remaining keys in the order in which they appear in
 191          * the journal, unpinning those journal entries as we go:
 192          */
 193         sort(keys_sorted.data, keys_sorted.nr,
 194              sizeof(keys_sorted.data[0]),
 195              journal_sort_seq_cmp, NULL);
 196
 197         darray_for_each(keys_sorted, kp) {
 198                 cond_resched();
 199
 200                 struct journal_key *k = *kp;
 201
 202                 replay_now_at(j, k->journal_seq);
 203
 204                 ret = commit_do(trans, NULL, NULL,
 205                                 BCH_TRANS_COMMIT_no_enospc|
 206                                 (!k->allocated
 207                                  ? BCH_TRANS_COMMIT_no_journal_res|BCH_WATERMARK_reclaim
 208                                  : 0),
 209                              bch2_journal_replay_key(trans, k));
 210                 bch_err_msg(c, ret, "while replaying key at btree %s level %u:",
 211                             bch2_btree_id_str(k->btree_id), k->level);
 212                 if (ret)
 213                         goto err;
 214
 215                 BUG_ON(!k->overwritten);
 216         }
 217
 218         /*
 219          * We need to put our btree_trans before calling flush_all_pins(), since
 220          * that will use a btree_trans internally
 221          */
 222         bch2_trans_put(trans);
 223         trans = NULL;
 224
 225         if (!c->opts.keep_journal)
 226                 bch2_journal_keys_put_initial(c);
 227
 228         replay_now_at(j, j->replay_journal_seq_end);
 229         j->replay_journal_seq = 0;
 230
 231         bch2_journal_set_replay_done(j);
 232
 233         if (keys->nr)
 234                 bch2_journal_log_msg(c, "journal replay finished");
 235 err:
 236         if (trans)
 237                 bch2_trans_put(trans);
 238         darray_exit(&keys_sorted);
 239         bch_err_fn(c, ret);
 240         return ret;
 241 }
 242
 243 /* journal replay early: */
 244
 245 static int journal_replay_entry_early(struct bch_fs *c,
 246                                       struct jset_entry *entry)
 247 {
 248         int ret = 0;
 249
 250         switch (entry->type) {
 251         case BCH_JSET_ENTRY_btree_root: {
 252                 struct btree_root *r;
 253
 254                 while (entry->btree_id >= c->btree_roots_extra.nr + BTREE_ID_NR) {
 255                         ret = darray_push(&c->btree_roots_extra, (struct btree_root) { NULL });
 256                         if (ret)
 257                                 return ret;
 258                 }
 259
 260                 r = bch2_btree_id_root(c, entry->btree_id);
 261
 262                 if (entry->u64s) {
 263                         r->level = entry->level;
 264                         bkey_copy(&r->key, (struct bkey_i *) entry->start);
 265                         r->error = 0;
 266                 } else {
 267                         r->error = -BCH_ERR_btree_node_read_error;
 268                 }
 269                 r->alive = true;
 270                 break;
 271         }
 272         case BCH_JSET_ENTRY_usage: {
 273                 struct jset_entry_usage *u =
 274                         container_of(entry, struct jset_entry_usage, entry);
 275
 276                 switch (entry->btree_id) {
 277                 case BCH_FS_USAGE_reserved:
 278                         if (entry->level < BCH_REPLICAS_MAX)
 279                                 c->usage_base->persistent_reserved[entry->level] =
 280                                         le64_to_cpu(u->v);
 281                         break;
 282                 case BCH_FS_USAGE_inodes:
 283                         c->usage_base->b.nr_inodes = le64_to_cpu(u->v);
 284                         break;
 285                 case BCH_FS_USAGE_key_version:
 286                         atomic64_set(&c->key_version,
 287                                      le64_to_cpu(u->v));
 288                         break;
 289                 }
 290
 291                 break;
 292         }
 293         case BCH_JSET_ENTRY_data_usage: {
 294                 struct jset_entry_data_usage *u =
 295                         container_of(entry, struct jset_entry_data_usage, entry);
 296
 297                 ret = bch2_replicas_set_usage(c, &u->r,
 298                                               le64_to_cpu(u->v));
 299                 break;
 300         }
 301         case BCH_JSET_ENTRY_dev_usage: {
 302                 struct jset_entry_dev_usage *u =
 303                         container_of(entry, struct jset_entry_dev_usage, entry);
 304                 struct bch_dev *ca = bch_dev_bkey_exists(c, le32_to_cpu(u->dev));
 305                 unsigned i, nr_types = jset_entry_dev_usage_nr_types(u);
 306
 307                 for (i = 0; i < min_t(unsigned, nr_types, BCH_DATA_NR); i++) {
 308                         ca->usage_base->d[i].buckets    = le64_to_cpu(u->d[i].buckets);
 309                         ca->usage_base->d[i].sectors    = le64_to_cpu(u->d[i].sectors);
 310                         ca->usage_base->d[i].fragmented = le64_to_cpu(u->d[i].fragmented);
 311                 }
 312
 313                 break;
 314         }
 315         case BCH_JSET_ENTRY_blacklist: {
 316                 struct jset_entry_blacklist *bl_entry =
 317                         container_of(entry, struct jset_entry_blacklist, entry);
 318
 319                 ret = bch2_journal_seq_blacklist_add(c,
 320                                 le64_to_cpu(bl_entry->seq),
 321                                 le64_to_cpu(bl_entry->seq) + 1);
 322                 break;
 323         }
 324         case BCH_JSET_ENTRY_blacklist_v2: {
 325                 struct jset_entry_blacklist_v2 *bl_entry =
 326                         container_of(entry, struct jset_entry_blacklist_v2, entry);
 327
 328                 ret = bch2_journal_seq_blacklist_add(c,
 329                                 le64_to_cpu(bl_entry->start),
 330                                 le64_to_cpu(bl_entry->end) + 1);
 331                 break;
 332         }
 333         case BCH_JSET_ENTRY_clock: {
 334                 struct jset_entry_clock *clock =
 335                         container_of(entry, struct jset_entry_clock, entry);
 336
 337                 atomic64_set(&c->io_clock[clock->rw].now, le64_to_cpu(clock->time));
 338         }
 339         }
 340
 341         return ret;
 342 }
 343
 344 static int journal_replay_early(struct bch_fs *c,
 345                                 struct bch_sb_field_clean *clean)
 346 {
 347         if (clean) {
 348                 for (struct jset_entry *entry = clean->start;
 349                      entry != vstruct_end(&clean->field);
 350                      entry = vstruct_next(entry)) {
 351                         int ret = journal_replay_entry_early(c, entry);
 352                         if (ret)
 353                                 return ret;
 354                 }
 355         } else {
 356                 struct genradix_iter iter;
 357                 struct journal_replay *i, **_i;
 358
 359                 genradix_for_each(&c->journal_entries, iter, _i) {
 360                         i = *_i;
 361
 362                         if (!i || i->ignore)
 363                                 continue;
 364
 365                         vstruct_for_each(&i->j, entry) {
 366                                 int ret = journal_replay_entry_early(c, entry);
 367                                 if (ret)
 368                                         return ret;
 369                         }
 370                 }
 371         }
 372
 373         bch2_fs_usage_initialize(c);
 374
 375         return 0;
 376 }
 377
 378 /* sb clean section: */
 379
 380 static int read_btree_roots(struct bch_fs *c)
 381 {
 382         unsigned i;
 383         int ret = 0;
 384
 385         for (i = 0; i < btree_id_nr_alive(c); i++) {
 386                 struct btree_root *r = bch2_btree_id_root(c, i);
 387
 388                 if (!r->alive)
 389                         continue;
 390
 391                 if (btree_id_is_alloc(i) &&
 392                     c->opts.reconstruct_alloc) {
 393                         c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 394                         continue;
 395                 }
 396
 397                 if (r->error) {
 398                         __fsck_err(c,
 399                                    btree_id_is_alloc(i)
 400                                    ? FSCK_CAN_IGNORE : 0,
 401                                    btree_root_bkey_invalid,
 402                                    "invalid btree root %s",
 403                                    bch2_btree_id_str(i));
 404                         if (i == BTREE_ID_alloc)
 405                                 c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 406                 }
 407
 408                 ret = bch2_btree_root_read(c, i, &r->key, r->level);
 409                 if (ret) {
 410                         fsck_err(c,
 411                                  btree_root_read_error,
 412                                  "error reading btree root %s",
 413                                  bch2_btree_id_str(i));
 414                         if (btree_id_is_alloc(i))
 415                                 c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 416                         ret = 0;
 417                 }
 418         }
 419
 420         for (i = 0; i < BTREE_ID_NR; i++) {
 421                 struct btree_root *r = bch2_btree_id_root(c, i);
 422
 423                 if (!r->b) {
 424                         r->alive = false;
 425                         r->level = 0;
 426                         bch2_btree_root_alloc(c, i);
 427                 }
 428         }
 429 fsck_err:
 430         return ret;
 431 }
 432
 433 static int bch2_initialize_subvolumes(struct bch_fs *c)
 434 {
 435         struct bkey_i_snapshot_tree     root_tree;
 436         struct bkey_i_snapshot          root_snapshot;
 437         struct bkey_i_subvolume         root_volume;
 438         int ret;
 439
 440         bkey_snapshot_tree_init(&root_tree.k_i);
 441         root_tree.k.p.offset            = 1;
 442         root_tree.v.master_subvol       = cpu_to_le32(1);
 443         root_tree.v.root_snapshot       = cpu_to_le32(U32_MAX);
 444
 445         bkey_snapshot_init(&root_snapshot.k_i);
 446         root_snapshot.k.p.offset = U32_MAX;
 447         root_snapshot.v.flags   = 0;
 448         root_snapshot.v.parent  = 0;
 449         root_snapshot.v.subvol  = cpu_to_le32(BCACHEFS_ROOT_SUBVOL);
 450         root_snapshot.v.tree    = cpu_to_le32(1);
 451         SET_BCH_SNAPSHOT_SUBVOL(&root_snapshot.v, true);
 452
 453         bkey_subvolume_init(&root_volume.k_i);
 454         root_volume.k.p.offset = BCACHEFS_ROOT_SUBVOL;
 455         root_volume.v.flags     = 0;
 456         root_volume.v.snapshot  = cpu_to_le32(U32_MAX);
 457         root_volume.v.inode     = cpu_to_le64(BCACHEFS_ROOT_INO);
 458
 459         ret =   bch2_btree_insert(c, BTREE_ID_snapshot_trees,   &root_tree.k_i, NULL, 0) ?:
 460                 bch2_btree_insert(c, BTREE_ID_snapshots,        &root_snapshot.k_i, NULL, 0) ?:
 461                 bch2_btree_insert(c, BTREE_ID_subvolumes,       &root_volume.k_i, NULL, 0);
 462         bch_err_fn(c, ret);
 463         return ret;
 464 }
 465
 466 static int __bch2_fs_upgrade_for_subvolumes(struct btree_trans *trans)
 467 {
 468         struct btree_iter iter;
 469         struct bkey_s_c k;
 470         struct bch_inode_unpacked inode;
 471         int ret;
 472
 473         k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_inodes,
 474                                SPOS(0, BCACHEFS_ROOT_INO, U32_MAX), 0);
 475         ret = bkey_err(k);
 476         if (ret)
 477                 return ret;
 478
 479         if (!bkey_is_inode(k.k)) {
 480                 bch_err(trans->c, "root inode not found");
 481                 ret = -BCH_ERR_ENOENT_inode;
 482                 goto err;
 483         }
 484
 485         ret = bch2_inode_unpack(k, &inode);
 486         BUG_ON(ret);
 487
 488         inode.bi_subvol = BCACHEFS_ROOT_SUBVOL;
 489
 490         ret = bch2_inode_write(trans, &iter, &inode);
 491 err:
 492         bch2_trans_iter_exit(trans, &iter);
 493         return ret;
 494 }
 495
 496 /* set bi_subvol on root inode */
 497 noinline_for_stack
 498 static int bch2_fs_upgrade_for_subvolumes(struct bch_fs *c)
 499 {
 500         int ret = bch2_trans_do(c, NULL, NULL, BCH_TRANS_COMMIT_lazy_rw,
 501                                 __bch2_fs_upgrade_for_subvolumes(trans));
 502         bch_err_fn(c, ret);
 503         return ret;
 504 }
 505
 506 const char * const bch2_recovery_passes[] = {
 507 #define x(_fn, ...)     #_fn,
 508         BCH_RECOVERY_PASSES()
 509 #undef x
 510         NULL
 511 };
 512
 513 static int bch2_check_allocations(struct bch_fs *c)
 514 {
 515         return bch2_gc(c, true, c->opts.norecovery);
 516 }
 517
 518 static int bch2_set_may_go_rw(struct bch_fs *c)
 519 {
 520         struct journal_keys *keys = &c->journal_keys;
 521
 522         /*
 523          * After we go RW, the journal keys buffer can't be modified (except for
 524          * setting journal_key->overwritten: it will be accessed by multiple
 525          * threads
 526          */
 527         move_gap(keys->d, keys->nr, keys->size, keys->gap, keys->nr);
 528         keys->gap = keys->nr;
 529
 530         set_bit(BCH_FS_may_go_rw, &c->flags);
 531
 532         if (keys->nr || c->opts.fsck || !c->sb.clean)
 533                 return bch2_fs_read_write_early(c);
 534         return 0;
 535 }
 536
 537 struct recovery_pass_fn {
 538         int             (*fn)(struct bch_fs *);
 539         unsigned        when;
 540 };
 541
 542 static struct recovery_pass_fn recovery_pass_fns[] = {
 543 #define x(_fn, _id, _when)      { .fn = bch2_##_fn, .when = _when },
 544         BCH_RECOVERY_PASSES()
 545 #undef x
 546 };
 547
 548 u64 bch2_recovery_passes_to_stable(u64 v)
 549 {
 550         static const u8 map[] = {
 551 #define x(n, id, ...)   [BCH_RECOVERY_PASS_##n] = BCH_RECOVERY_PASS_STABLE_##n,
 552         BCH_RECOVERY_PASSES()
 553 #undef x
 554         };
 555
 556         u64 ret = 0;
 557         for (unsigned i = 0; i < ARRAY_SIZE(map); i++)
 558                 if (v & BIT_ULL(i))
 559                         ret |= BIT_ULL(map[i]);
 560         return ret;
 561 }
 562
 563 u64 bch2_recovery_passes_from_stable(u64 v)
 564 {
 565         static const u8 map[] = {
 566 #define x(n, id, ...)   [BCH_RECOVERY_PASS_STABLE_##n] = BCH_RECOVERY_PASS_##n,
 567         BCH_RECOVERY_PASSES()
 568 #undef x
 569         };
 570
 571         u64 ret = 0;
 572         for (unsigned i = 0; i < ARRAY_SIZE(map); i++)
 573                 if (v & BIT_ULL(i))
 574                         ret |= BIT_ULL(map[i]);
 575         return ret;
 576 }
 577
 578 static bool check_version_upgrade(struct bch_fs *c)
 579 {
 580         unsigned latest_version = bcachefs_metadata_version_current;
 581         unsigned latest_compatible = min(latest_version,
 582                                          bch2_latest_compatible_version(c->sb.version));
 583         unsigned old_version = c->sb.version_upgrade_complete ?: c->sb.version;
 584         unsigned new_version = 0;
 585
 586         if (old_version < bcachefs_metadata_required_upgrade_below) {
 587                 if (c->opts.version_upgrade == BCH_VERSION_UPGRADE_incompatible ||
 588                     latest_compatible < bcachefs_metadata_required_upgrade_below)
 589                         new_version = latest_version;
 590                 else
 591                         new_version = latest_compatible;
 592         } else {
 593                 switch (c->opts.version_upgrade) {
 594                 case BCH_VERSION_UPGRADE_compatible:
 595                         new_version = latest_compatible;
 596                         break;
 597                 case BCH_VERSION_UPGRADE_incompatible:
 598                         new_version = latest_version;
 599                         break;
 600                 case BCH_VERSION_UPGRADE_none:
 601                         new_version = min(old_version, latest_version);
 602                         break;
 603                 }
 604         }
 605
 606         if (new_version > old_version) {
 607                 struct printbuf buf = PRINTBUF;
 608
 609                 if (old_version < bcachefs_metadata_required_upgrade_below)
 610                         prt_str(&buf, "Version upgrade required:\n");
 611
 612                 if (old_version != c->sb.version) {
 613                         prt_str(&buf, "Version upgrade from ");
 614                         bch2_version_to_text(&buf, c->sb.version_upgrade_complete);
 615                         prt_str(&buf, " to ");
 616                         bch2_version_to_text(&buf, c->sb.version);
 617                         prt_str(&buf, " incomplete\n");
 618                 }
 619
 620                 prt_printf(&buf, "Doing %s version upgrade from ",
 621                            BCH_VERSION_MAJOR(old_version) != BCH_VERSION_MAJOR(new_version)
 622                            ? "incompatible" : "compatible");
 623                 bch2_version_to_text(&buf, old_version);
 624                 prt_str(&buf, " to ");
 625                 bch2_version_to_text(&buf, new_version);
 626                 prt_newline(&buf);
 627
 628                 struct bch_sb_field_ext *ext = bch2_sb_field_get(c->disk_sb.sb, ext);
 629                 __le64 passes = ext->recovery_passes_required[0];
 630                 bch2_sb_set_upgrade(c, old_version, new_version);
 631                 passes = ext->recovery_passes_required[0] & ~passes;
 632
 633                 if (passes) {
 634                         prt_str(&buf, "  running recovery passes: ");
 635                         prt_bitflags(&buf, bch2_recovery_passes,
 636                                      bch2_recovery_passes_from_stable(le64_to_cpu(passes)));
 637                 }
 638
 639                 bch_info(c, "%s", buf.buf);
 640
 641                 bch2_sb_upgrade(c, new_version);
 642
 643                 printbuf_exit(&buf);
 644                 return true;
 645         }
 646
 647         return false;
 648 }
 649
 650 u64 bch2_fsck_recovery_passes(void)
 651 {
 652         u64 ret = 0;
 653
 654         for (unsigned i = 0; i < ARRAY_SIZE(recovery_pass_fns); i++)
 655                 if (recovery_pass_fns[i].when & PASS_FSCK)
 656                         ret |= BIT_ULL(i);
 657         return ret;
 658 }
 659
 660 static bool should_run_recovery_pass(struct bch_fs *c, enum bch_recovery_pass pass)
 661 {
 662         struct recovery_pass_fn *p = recovery_pass_fns + pass;
 663
 664         if (c->opts.norecovery && pass > BCH_RECOVERY_PASS_snapshots_read)
 665                 return false;
 666         if (c->recovery_passes_explicit & BIT_ULL(pass))
 667                 return true;
 668         if ((p->when & PASS_FSCK) && c->opts.fsck)
 669                 return true;
 670         if ((p->when & PASS_UNCLEAN) && !c->sb.clean)
 671                 return true;
 672         if (p->when & PASS_ALWAYS)
 673                 return true;
 674         return false;
 675 }
 676
 677 static int bch2_run_recovery_pass(struct bch_fs *c, enum bch_recovery_pass pass)
 678 {
 679         struct recovery_pass_fn *p = recovery_pass_fns + pass;
 680         int ret;
 681
 682         if (!(p->when & PASS_SILENT))
 683                 bch2_print(c, KERN_INFO bch2_log_msg(c, "%s..."),
 684                            bch2_recovery_passes[pass]);
 685         ret = p->fn(c);
 686         if (ret)
 687                 return ret;
 688         if (!(p->when & PASS_SILENT))
 689                 bch2_print(c, KERN_CONT " done\n");
 690
 691         return 0;
 692 }
 693
 694 static int bch2_run_recovery_passes(struct bch_fs *c)
 695 {
 696         int ret = 0;
 697
 698         while (c->curr_recovery_pass < ARRAY_SIZE(recovery_pass_fns)) {
 699                 if (should_run_recovery_pass(c, c->curr_recovery_pass)) {
 700                         unsigned pass = c->curr_recovery_pass;
 701
 702                         ret = bch2_run_recovery_pass(c, c->curr_recovery_pass);
 703                         if (bch2_err_matches(ret, BCH_ERR_restart_recovery) ||
 704                             (ret && c->curr_recovery_pass < pass))
 705                                 continue;
 706                         if (ret)
 707                                 break;
 708
 709                         c->recovery_passes_complete |= BIT_ULL(c->curr_recovery_pass);
 710                 }
 711                 c->curr_recovery_pass++;
 712                 c->recovery_pass_done = max(c->recovery_pass_done, c->curr_recovery_pass);
 713         }
 714
 715         return ret;
 716 }
 717
 718 int bch2_run_online_recovery_passes(struct bch_fs *c)
 719 {
 720         int ret = 0;
 721
 722         for (unsigned i = 0; i < ARRAY_SIZE(recovery_pass_fns); i++) {
 723                 struct recovery_pass_fn *p = recovery_pass_fns + i;
 724
 725                 if (!(p->when & PASS_ONLINE))
 726                         continue;
 727
 728                 ret = bch2_run_recovery_pass(c, i);
 729                 if (bch2_err_matches(ret, BCH_ERR_restart_recovery)) {
 730                         i = c->curr_recovery_pass;
 731                         continue;
 732                 }
 733                 if (ret)
 734                         break;
 735         }
 736
 737         return ret;
 738 }
 739
 740 int bch2_fs_recovery(struct bch_fs *c)
 741 {
 742         struct bch_sb_field_clean *clean = NULL;
 743         struct jset *last_journal_entry = NULL;
 744         u64 last_seq = 0, blacklist_seq, journal_seq;
 745         int ret = 0;
 746
 747         if (c->sb.clean) {
 748                 clean = bch2_read_superblock_clean(c);
 749                 ret = PTR_ERR_OR_ZERO(clean);
 750                 if (ret)
 751                         goto err;
 752
 753                 bch_info(c, "recovering from clean shutdown, journal seq %llu",
 754                          le64_to_cpu(clean->journal_seq));
 755         } else {
 756                 bch_info(c, "recovering from unclean shutdown");
 757         }
 758
 759         if (!(c->sb.features & (1ULL << BCH_FEATURE_new_extent_overwrite))) {
 760                 bch_err(c, "feature new_extent_overwrite not set, filesystem no longer supported");
 761                 ret = -EINVAL;
 762                 goto err;
 763         }
 764
 765         if (!c->sb.clean &&
 766             !(c->sb.features & (1ULL << BCH_FEATURE_extents_above_btree_updates))) {
 767                 bch_err(c, "filesystem needs recovery from older version; run fsck from older bcachefs-tools to fix");
 768                 ret = -EINVAL;
 769                 goto err;
 770         }
 771
 772         if (c->opts.fsck && c->opts.norecovery) {
 773                 bch_err(c, "cannot select both norecovery and fsck");
 774                 ret = -EINVAL;
 775                 goto err;
 776         }
 777
 778         if (!c->opts.nochanges) {
 779                 mutex_lock(&c->sb_lock);
 780                 bool write_sb = false;
 781
 782                 struct bch_sb_field_ext *ext =
 783                         bch2_sb_field_get_minsize(&c->disk_sb, ext, sizeof(*ext) / sizeof(u64));
 784                 if (!ext) {
 785                         ret = -BCH_ERR_ENOSPC_sb;
 786                         mutex_unlock(&c->sb_lock);
 787                         goto err;
 788                 }
 789
 790                 if (BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb)) {
 791                         ext->recovery_passes_required[0] |=
 792                                 cpu_to_le64(bch2_recovery_passes_to_stable(BIT_ULL(BCH_RECOVERY_PASS_check_topology)));
 793                         write_sb = true;
 794                 }
 795
 796                 u64 sb_passes = bch2_recovery_passes_from_stable(le64_to_cpu(ext->recovery_passes_required[0]));
 797                 if (sb_passes) {
 798                         struct printbuf buf = PRINTBUF;
 799                         prt_str(&buf, "superblock requires following recovery passes to be run:\n  ");
 800                         prt_bitflags(&buf, bch2_recovery_passes, sb_passes);
 801                         bch_info(c, "%s", buf.buf);
 802                         printbuf_exit(&buf);
 803                 }
 804
 805                 if (bch2_check_version_downgrade(c)) {
 806                         struct printbuf buf = PRINTBUF;
 807
 808                         prt_str(&buf, "Version downgrade required:");
 809
 810                         __le64 passes = ext->recovery_passes_required[0];
 811                         bch2_sb_set_downgrade(c,
 812                                         BCH_VERSION_MINOR(bcachefs_metadata_version_current),
 813                                         BCH_VERSION_MINOR(c->sb.version));
 814                         passes = ext->recovery_passes_required[0] & ~passes;
 815                         if (passes) {
 816                                 prt_str(&buf, "\n  running recovery passes: ");
 817                                 prt_bitflags(&buf, bch2_recovery_passes,
 818                                              bch2_recovery_passes_from_stable(le64_to_cpu(passes)));
 819                         }
 820
 821                         bch_info(c, "%s", buf.buf);
 822                         printbuf_exit(&buf);
 823                         write_sb = true;
 824                 }
 825
 826                 if (check_version_upgrade(c))
 827                         write_sb = true;
 828
 829                 if (write_sb)
 830                         bch2_write_super(c);
 831
 832                 c->recovery_passes_explicit |= bch2_recovery_passes_from_stable(le64_to_cpu(ext->recovery_passes_required[0]));
 833                 mutex_unlock(&c->sb_lock);
 834         }
 835
 836         if (c->opts.fsck && IS_ENABLED(CONFIG_BCACHEFS_DEBUG))
 837                 c->recovery_passes_explicit |= BIT_ULL(BCH_RECOVERY_PASS_check_topology);
 838
 839         if (c->opts.fsck)
 840                 set_bit(BCH_FS_fsck_running, &c->flags);
 841
 842         ret = bch2_blacklist_table_initialize(c);
 843         if (ret) {
 844                 bch_err(c, "error initializing blacklist table");
 845                 goto err;
 846         }
 847
 848         if (!c->sb.clean || c->opts.fsck || c->opts.keep_journal) {
 849                 struct genradix_iter iter;
 850                 struct journal_replay **i;
 851
 852                 bch_verbose(c, "starting journal read");
 853                 ret = bch2_journal_read(c, &last_seq, &blacklist_seq, &journal_seq);
 854                 if (ret)
 855                         goto err;
 856
 857                 /*
 858                  * note: cmd_list_journal needs the blacklist table fully up to date so
 859                  * it can asterisk ignored journal entries:
 860                  */
 861                 if (c->opts.read_journal_only)
 862                         goto out;
 863
 864                 genradix_for_each_reverse(&c->journal_entries, iter, i)
 865                         if (*i && !(*i)->ignore) {
 866                                 last_journal_entry = &(*i)->j;
 867                                 break;
 868                         }
 869
 870                 if (mustfix_fsck_err_on(c->sb.clean &&
 871                                         last_journal_entry &&
 872                                         !journal_entry_empty(last_journal_entry), c,
 873                                 clean_but_journal_not_empty,
 874                                 "filesystem marked clean but journal not empty")) {
 875                         c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 876                         SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
 877                         c->sb.clean = false;
 878                 }
 879
 880                 if (!last_journal_entry) {
 881                         fsck_err_on(!c->sb.clean, c,
 882                                     dirty_but_no_journal_entries,
 883                                     "no journal entries found");
 884                         if (clean)
 885                                 goto use_clean;
 886
 887                         genradix_for_each_reverse(&c->journal_entries, iter, i)
 888                                 if (*i) {
 889                                         last_journal_entry = &(*i)->j;
 890                                         (*i)->ignore = false;
 891                                         /*
 892                                          * This was probably a NO_FLUSH entry,
 893                                          * so last_seq was garbage - but we know
 894                                          * we're only using a single journal
 895                                          * entry, set it here:
 896                                          */
 897                                         (*i)->j.last_seq = (*i)->j.seq;
 898                                         break;
 899                                 }
 900                 }
 901
 902                 ret = bch2_journal_keys_sort(c);
 903                 if (ret)
 904                         goto err;
 905
 906                 if (c->sb.clean && last_journal_entry) {
 907                         ret = bch2_verify_superblock_clean(c, &clean,
 908                                                       last_journal_entry);
 909                         if (ret)
 910                                 goto err;
 911                 }
 912         } else {
 913 use_clean:
 914                 if (!clean) {
 915                         bch_err(c, "no superblock clean section found");
 916                         ret = -BCH_ERR_fsck_repair_impossible;
 917                         goto err;
 918
 919                 }
 920                 blacklist_seq = journal_seq = le64_to_cpu(clean->journal_seq) + 1;
 921         }
 922
 923         c->journal_replay_seq_start     = last_seq;
 924         c->journal_replay_seq_end       = blacklist_seq - 1;
 925
 926         if (c->opts.reconstruct_alloc) {
 927                 c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 928                 drop_alloc_keys(&c->journal_keys);
 929         }
 930
 931         zero_out_btree_mem_ptr(&c->journal_keys);
 932
 933         ret = journal_replay_early(c, clean);
 934         if (ret)
 935                 goto err;
 936
 937         /*
 938          * After an unclean shutdown, skip then next few journal sequence
 939          * numbers as they may have been referenced by btree writes that
 940          * happened before their corresponding journal writes - those btree
 941          * writes need to be ignored, by skipping and blacklisting the next few
 942          * journal sequence numbers:
 943          */
 944         if (!c->sb.clean)
 945                 journal_seq += 8;
 946
 947         if (blacklist_seq != journal_seq) {
 948                 ret =   bch2_journal_log_msg(c, "blacklisting entries %llu-%llu",
 949                                              blacklist_seq, journal_seq) ?:
 950                         bch2_journal_seq_blacklist_add(c,
 951                                         blacklist_seq, journal_seq);
 952                 if (ret) {
 953                         bch_err(c, "error creating new journal seq blacklist entry");
 954                         goto err;
 955                 }
 956         }
 957
 958         ret =   bch2_journal_log_msg(c, "starting journal at entry %llu, replaying %llu-%llu",
 959                                      journal_seq, last_seq, blacklist_seq - 1) ?:
 960                 bch2_fs_journal_start(&c->journal, journal_seq);
 961         if (ret)
 962                 goto err;
 963
 964         if (c->opts.reconstruct_alloc)
 965                 bch2_journal_log_msg(c, "dropping alloc info");
 966
 967         /*
 968          * Skip past versions that might have possibly been used (as nonces),
 969          * but hadn't had their pointers written:
 970          */
 971         if (c->sb.encryption_type && !c->sb.clean)
 972                 atomic64_add(1 << 16, &c->key_version);
 973
 974         ret = read_btree_roots(c);
 975         if (ret)
 976                 goto err;
 977
 978         ret = bch2_run_recovery_passes(c);
 979         if (ret)
 980                 goto err;
 981
 982         clear_bit(BCH_FS_fsck_running, &c->flags);
 983
 984         /* If we fixed errors, verify that fs is actually clean now: */
 985         if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG) &&
 986             test_bit(BCH_FS_errors_fixed, &c->flags) &&
 987             !test_bit(BCH_FS_errors_not_fixed, &c->flags) &&
 988             !test_bit(BCH_FS_error, &c->flags)) {
 989                 bch2_flush_fsck_errs(c);
 990
 991                 bch_info(c, "Fixed errors, running fsck a second time to verify fs is clean");
 992                 clear_bit(BCH_FS_errors_fixed, &c->flags);
 993
 994                 c->curr_recovery_pass = BCH_RECOVERY_PASS_check_alloc_info;
 995
 996                 ret = bch2_run_recovery_passes(c);
 997                 if (ret)
 998                         goto err;
 999
1000                 if (test_bit(BCH_FS_errors_fixed, &c->flags) ||
1001                     test_bit(BCH_FS_errors_not_fixed, &c->flags)) {
1002                         bch_err(c, "Second fsck run was not clean");
1003                         set_bit(BCH_FS_errors_not_fixed, &c->flags);
1004                 }
1005
1006                 set_bit(BCH_FS_errors_fixed, &c->flags);
1007         }
1008
1009         if (enabled_qtypes(c)) {
1010                 bch_verbose(c, "reading quotas");
1011                 ret = bch2_fs_quota_read(c);
1012                 if (ret)
1013                         goto err;
1014                 bch_verbose(c, "quotas done");
1015         }
1016
1017         mutex_lock(&c->sb_lock);
1018         bool write_sb = false;
1019
1020         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) != le16_to_cpu(c->disk_sb.sb->version)) {
1021                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, le16_to_cpu(c->disk_sb.sb->version));
1022                 write_sb = true;
1023         }
1024
1025         if (!test_bit(BCH_FS_error, &c->flags) &&
1026             !(c->disk_sb.sb->compat[0] & cpu_to_le64(1ULL << BCH_COMPAT_alloc_info))) {
1027                 c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_info);
1028                 write_sb = true;
1029         }
1030
1031         if (!test_bit(BCH_FS_error, &c->flags)) {
1032                 struct bch_sb_field_ext *ext = bch2_sb_field_get(c->disk_sb.sb, ext);
1033                 if (ext &&
1034                     (!bch2_is_zero(ext->recovery_passes_required, sizeof(ext->recovery_passes_required)) ||
1035                      !bch2_is_zero(ext->errors_silent, sizeof(ext->errors_silent)))) {
1036                         memset(ext->recovery_passes_required, 0, sizeof(ext->recovery_passes_required));
1037                         memset(ext->errors_silent, 0, sizeof(ext->errors_silent));
1038                         write_sb = true;
1039                 }
1040         }
1041
1042         if (c->opts.fsck &&
1043             !test_bit(BCH_FS_error, &c->flags) &&
1044             !test_bit(BCH_FS_errors_not_fixed, &c->flags)) {
1045                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 0);
1046                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 0);
1047                 write_sb = true;
1048         }
1049
1050         if (write_sb)
1051                 bch2_write_super(c);
1052         mutex_unlock(&c->sb_lock);
1053
1054         if (!(c->sb.compat & (1ULL << BCH_COMPAT_extents_above_btree_updates_done)) ||
1055             c->sb.version_min < bcachefs_metadata_version_btree_ptr_sectors_written) {
1056                 struct bch_move_stats stats;
1057
1058                 bch2_move_stats_init(&stats, "recovery");
1059
1060                 struct printbuf buf = PRINTBUF;
1061                 bch2_version_to_text(&buf, c->sb.version_min);
1062                 bch_info(c, "scanning for old btree nodes: min_version %s", buf.buf);
1063                 printbuf_exit(&buf);
1064
1065                 ret =   bch2_fs_read_write_early(c) ?:
1066                         bch2_scan_old_btree_nodes(c, &stats);
1067                 if (ret)
1068                         goto err;
1069                 bch_info(c, "scanning for old btree nodes done");
1070         }
1071
1072         if (c->journal_seq_blacklist_table &&
1073             c->journal_seq_blacklist_table->nr > 128)
1074                 queue_work(system_long_wq, &c->journal_seq_blacklist_gc_work);
1075
1076         ret = 0;
1077 out:
1078         bch2_flush_fsck_errs(c);
1079
1080         if (!c->opts.keep_journal &&
1081             test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags))
1082                 bch2_journal_keys_put_initial(c);
1083         kfree(clean);
1084
1085         if (!ret &&
1086             test_bit(BCH_FS_need_delete_dead_snapshots, &c->flags) &&
1087             !c->opts.nochanges) {
1088                 bch2_fs_read_write_early(c);
1089                 bch2_delete_dead_snapshots_async(c);
1090         }
1091
1092         bch_err_fn(c, ret);
1093         return ret;
1094 err:
1095 fsck_err:
1096         bch2_fs_emergency_read_only(c);
1097         goto out;
1098 }
1099
1100 int bch2_fs_initialize(struct bch_fs *c)
1101 {
1102         struct bch_inode_unpacked root_inode, lostfound_inode;
1103         struct bkey_inode_buf packed_inode;
1104         struct qstr lostfound = QSTR("lost+found");
1105         int ret;
1106
1107         bch_notice(c, "initializing new filesystem");
1108
1109         mutex_lock(&c->sb_lock);
1110         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_extents_above_btree_updates_done);
1111         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_bformat_overflow_done);
1112
1113         bch2_check_version_downgrade(c);
1114
1115         if (c->opts.version_upgrade != BCH_VERSION_UPGRADE_none) {
1116                 bch2_sb_upgrade(c, bcachefs_metadata_version_current);
1117                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1118                 bch2_write_super(c);
1119         }
1120         mutex_unlock(&c->sb_lock);
1121
1122         c->curr_recovery_pass = ARRAY_SIZE(recovery_pass_fns);
1123         set_bit(BCH_FS_may_go_rw, &c->flags);
1124
1125         for (unsigned i = 0; i < BTREE_ID_NR; i++)
1126                 bch2_btree_root_alloc(c, i);
1127
1128         for_each_member_device(c, ca)
1129                 bch2_dev_usage_init(ca);
1130
1131         ret = bch2_fs_journal_alloc(c);
1132         if (ret)
1133                 goto err;
1134
1135         /*
1136          * journal_res_get() will crash if called before this has
1137          * set up the journal.pin FIFO and journal.cur pointer:
1138          */
1139         bch2_fs_journal_start(&c->journal, 1);
1140         bch2_journal_set_replay_done(&c->journal);
1141
1142         ret = bch2_fs_read_write_early(c);
1143         if (ret)
1144                 goto err;
1145
1146         /*
1147          * Write out the superblock and journal buckets, now that we can do
1148          * btree updates
1149          */
1150         bch_verbose(c, "marking superblocks");
1151         ret = bch2_trans_mark_dev_sbs(c);
1152         bch_err_msg(c, ret, "marking superblocks");
1153         if (ret)
1154                 goto err;
1155
1156         for_each_online_member(c, ca)
1157                 ca->new_fs_bucket_idx = 0;
1158
1159         ret = bch2_fs_freespace_init(c);
1160         if (ret)
1161                 goto err;
1162
1163         ret = bch2_initialize_subvolumes(c);
1164         if (ret)
1165                 goto err;
1166
1167         bch_verbose(c, "reading snapshots table");
1168         ret = bch2_snapshots_read(c);
1169         if (ret)
1170                 goto err;
1171         bch_verbose(c, "reading snapshots done");
1172
1173         bch2_inode_init(c, &root_inode, 0, 0, S_IFDIR|0755, 0, NULL);
1174         root_inode.bi_inum      = BCACHEFS_ROOT_INO;
1175         root_inode.bi_subvol    = BCACHEFS_ROOT_SUBVOL;
1176         bch2_inode_pack(&packed_inode, &root_inode);
1177         packed_inode.inode.k.p.snapshot = U32_MAX;
1178
1179         ret = bch2_btree_insert(c, BTREE_ID_inodes, &packed_inode.inode.k_i, NULL, 0);
1180         bch_err_msg(c, ret, "creating root directory");
1181         if (ret)
1182                 goto err;
1183
1184         bch2_inode_init_early(c, &lostfound_inode);
1185
1186         ret = bch2_trans_do(c, NULL, NULL, 0,
1187                 bch2_create_trans(trans,
1188                                   BCACHEFS_ROOT_SUBVOL_INUM,
1189                                   &root_inode, &lostfound_inode,
1190                                   &lostfound,
1191                                   0, 0, S_IFDIR|0700, 0,
1192                                   NULL, NULL, (subvol_inum) { 0 }, 0));
1193         bch_err_msg(c, ret, "creating lost+found");
1194         if (ret)
1195                 goto err;
1196
1197         c->recovery_pass_done = ARRAY_SIZE(recovery_pass_fns) - 1;
1198
1199         if (enabled_qtypes(c)) {
1200                 ret = bch2_fs_quota_read(c);
1201                 if (ret)
1202                         goto err;
1203         }
1204
1205         ret = bch2_journal_flush(&c->journal);
1206         bch_err_msg(c, ret, "writing first journal entry");
1207         if (ret)
1208                 goto err;
1209
1210         mutex_lock(&c->sb_lock);
1211         SET_BCH_SB_INITIALIZED(c->disk_sb.sb, true);
1212         SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
1213
1214         bch2_write_super(c);
1215         mutex_unlock(&c->sb_lock);
1216
1217         return 0;
1218 err:
1219         bch_err_fn(c, ret);
1220         return ret;
1221 }