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 "recovery.h"
  27 #include "replicas.h"
  28 #include "sb-clean.h"
  29 #include "snapshot.h"
  30 #include "subvolume.h"
  31 #include "super-io.h"
  32
  33 #include <linux/sort.h>
  34 #include <linux/stat.h>
  35
  36 #define QSTR(n) { { { .len = strlen(n) } }, .name = n }
  37
  38 /* for -o reconstruct_alloc: */
  39 static void drop_alloc_keys(struct journal_keys *keys)
  40 {
  41         size_t src, dst;
  42
  43         for (src = 0, dst = 0; src < keys->nr; src++)
  44                 if (keys->d[src].btree_id != BTREE_ID_alloc)
  45                         keys->d[dst++] = keys->d[src];
  46
  47         keys->nr = dst;
  48 }
  49
  50 /*
  51  * Btree node pointers have a field to stack a pointer to the in memory btree
  52  * node; we need to zero out this field when reading in btree nodes, or when
  53  * reading in keys from the journal:
  54  */
  55 static void zero_out_btree_mem_ptr(struct journal_keys *keys)
  56 {
  57         struct journal_key *i;
  58
  59         for (i = keys->d; i < keys->d + keys->nr; i++)
  60                 if (i->k->k.type == KEY_TYPE_btree_ptr_v2)
  61                         bkey_i_to_btree_ptr_v2(i->k)->v.mem_ptr = 0;
  62 }
  63
  64 /* journal replay: */
  65
  66 static void replay_now_at(struct journal *j, u64 seq)
  67 {
  68         BUG_ON(seq < j->replay_journal_seq);
  69
  70         seq = min(seq, j->replay_journal_seq_end);
  71
  72         while (j->replay_journal_seq < seq)
  73                 bch2_journal_pin_put(j, j->replay_journal_seq++);
  74 }
  75
  76 static int bch2_journal_replay_key(struct btree_trans *trans,
  77                                    struct journal_key *k)
  78 {
  79         struct btree_iter iter;
  80         unsigned iter_flags =
  81                 BTREE_ITER_INTENT|
  82                 BTREE_ITER_NOT_EXTENTS;
  83         unsigned update_flags = BTREE_TRIGGER_NORUN;
  84         int ret;
  85
  86         /*
  87          * BTREE_UPDATE_KEY_CACHE_RECLAIM disables key cache lookup/update to
  88          * keep the key cache coherent with the underlying btree. Nothing
  89          * besides the allocator is doing updates yet so we don't need key cache
  90          * coherency for non-alloc btrees, and key cache fills for snapshots
  91          * btrees use BTREE_ITER_FILTER_SNAPSHOTS, which isn't available until
  92          * the snapshots recovery pass runs.
  93          */
  94         if (!k->level && k->btree_id == BTREE_ID_alloc)
  95                 iter_flags |= BTREE_ITER_CACHED;
  96         else
  97                 update_flags |= BTREE_UPDATE_KEY_CACHE_RECLAIM;
  98
  99         bch2_trans_node_iter_init(trans, &iter, k->btree_id, k->k->k.p,
 100                                   BTREE_MAX_DEPTH, k->level,
 101                                   iter_flags);
 102         ret = bch2_btree_iter_traverse(&iter);
 103         if (ret)
 104                 goto out;
 105
 106         /* Must be checked with btree locked: */
 107         if (k->overwritten)
 108                 goto out;
 109
 110         ret = bch2_trans_update(trans, &iter, k->k, update_flags);
 111 out:
 112         bch2_trans_iter_exit(trans, &iter);
 113         return ret;
 114 }
 115
 116 static int journal_sort_seq_cmp(const void *_l, const void *_r)
 117 {
 118         const struct journal_key *l = *((const struct journal_key **)_l);
 119         const struct journal_key *r = *((const struct journal_key **)_r);
 120
 121         return cmp_int(l->journal_seq, r->journal_seq);
 122 }
 123
 124 static int bch2_journal_replay(struct bch_fs *c)
 125 {
 126         struct journal_keys *keys = &c->journal_keys;
 127         struct journal_key **keys_sorted, *k;
 128         struct journal *j = &c->journal;
 129         u64 start_seq   = c->journal_replay_seq_start;
 130         u64 end_seq     = c->journal_replay_seq_start;
 131         size_t i;
 132         int ret;
 133
 134         move_gap(keys->d, keys->nr, keys->size, keys->gap, keys->nr);
 135         keys->gap = keys->nr;
 136
 137         keys_sorted = kvmalloc_array(keys->nr, sizeof(*keys_sorted), GFP_KERNEL);
 138         if (!keys_sorted)
 139                 return -BCH_ERR_ENOMEM_journal_replay;
 140
 141         for (i = 0; i < keys->nr; i++)
 142                 keys_sorted[i] = &keys->d[i];
 143
 144         sort(keys_sorted, keys->nr,
 145              sizeof(keys_sorted[0]),
 146              journal_sort_seq_cmp, NULL);
 147
 148         if (keys->nr) {
 149                 ret = bch2_journal_log_msg(c, "Starting journal replay (%zu keys in entries %llu-%llu)",
 150                                            keys->nr, start_seq, end_seq);
 151                 if (ret)
 152                         goto err;
 153         }
 154
 155         for (i = 0; i < keys->nr; i++) {
 156                 k = keys_sorted[i];
 157
 158                 cond_resched();
 159
 160                 replay_now_at(j, k->journal_seq);
 161
 162                 ret = bch2_trans_do(c, NULL, NULL,
 163                                     BTREE_INSERT_LAZY_RW|
 164                                     BTREE_INSERT_NOFAIL|
 165                                     (!k->allocated
 166                                      ? BTREE_INSERT_JOURNAL_REPLAY|BCH_WATERMARK_reclaim
 167                                      : 0),
 168                              bch2_journal_replay_key(trans, k));
 169                 if (ret) {
 170                         bch_err(c, "journal replay: error while replaying key at btree %s level %u: %s",
 171                                 bch2_btree_ids[k->btree_id], k->level, bch2_err_str(ret));
 172                         goto err;
 173                 }
 174         }
 175
 176         replay_now_at(j, j->replay_journal_seq_end);
 177         j->replay_journal_seq = 0;
 178
 179         bch2_journal_set_replay_done(j);
 180         bch2_journal_flush_all_pins(j);
 181         ret = bch2_journal_error(j);
 182
 183         if (keys->nr && !ret)
 184                 bch2_journal_log_msg(c, "journal replay finished");
 185 err:
 186         kvfree(keys_sorted);
 187
 188         if (ret)
 189                 bch_err_fn(c, ret);
 190         return ret;
 191 }
 192
 193 /* journal replay early: */
 194
 195 static int journal_replay_entry_early(struct bch_fs *c,
 196                                       struct jset_entry *entry)
 197 {
 198         int ret = 0;
 199
 200         switch (entry->type) {
 201         case BCH_JSET_ENTRY_btree_root: {
 202                 struct btree_root *r;
 203
 204                 while (entry->btree_id >= c->btree_roots_extra.nr + BTREE_ID_NR) {
 205                         ret = darray_push(&c->btree_roots_extra, (struct btree_root) { NULL });
 206                         if (ret)
 207                                 return ret;
 208                 }
 209
 210                 r = bch2_btree_id_root(c, entry->btree_id);
 211
 212                 if (entry->u64s) {
 213                         r->level = entry->level;
 214                         bkey_copy(&r->key, &entry->start[0]);
 215                         r->error = 0;
 216                 } else {
 217                         r->error = -EIO;
 218                 }
 219                 r->alive = true;
 220                 break;
 221         }
 222         case BCH_JSET_ENTRY_usage: {
 223                 struct jset_entry_usage *u =
 224                         container_of(entry, struct jset_entry_usage, entry);
 225
 226                 switch (entry->btree_id) {
 227                 case BCH_FS_USAGE_reserved:
 228                         if (entry->level < BCH_REPLICAS_MAX)
 229                                 c->usage_base->persistent_reserved[entry->level] =
 230                                         le64_to_cpu(u->v);
 231                         break;
 232                 case BCH_FS_USAGE_inodes:
 233                         c->usage_base->nr_inodes = le64_to_cpu(u->v);
 234                         break;
 235                 case BCH_FS_USAGE_key_version:
 236                         atomic64_set(&c->key_version,
 237                                      le64_to_cpu(u->v));
 238                         break;
 239                 }
 240
 241                 break;
 242         }
 243         case BCH_JSET_ENTRY_data_usage: {
 244                 struct jset_entry_data_usage *u =
 245                         container_of(entry, struct jset_entry_data_usage, entry);
 246
 247                 ret = bch2_replicas_set_usage(c, &u->r,
 248                                               le64_to_cpu(u->v));
 249                 break;
 250         }
 251         case BCH_JSET_ENTRY_dev_usage: {
 252                 struct jset_entry_dev_usage *u =
 253                         container_of(entry, struct jset_entry_dev_usage, entry);
 254                 struct bch_dev *ca = bch_dev_bkey_exists(c, le32_to_cpu(u->dev));
 255                 unsigned i, nr_types = jset_entry_dev_usage_nr_types(u);
 256
 257                 ca->usage_base->buckets_ec              = le64_to_cpu(u->buckets_ec);
 258
 259                 for (i = 0; i < min_t(unsigned, nr_types, BCH_DATA_NR); i++) {
 260                         ca->usage_base->d[i].buckets    = le64_to_cpu(u->d[i].buckets);
 261                         ca->usage_base->d[i].sectors    = le64_to_cpu(u->d[i].sectors);
 262                         ca->usage_base->d[i].fragmented = le64_to_cpu(u->d[i].fragmented);
 263                 }
 264
 265                 break;
 266         }
 267         case BCH_JSET_ENTRY_blacklist: {
 268                 struct jset_entry_blacklist *bl_entry =
 269                         container_of(entry, struct jset_entry_blacklist, entry);
 270
 271                 ret = bch2_journal_seq_blacklist_add(c,
 272                                 le64_to_cpu(bl_entry->seq),
 273                                 le64_to_cpu(bl_entry->seq) + 1);
 274                 break;
 275         }
 276         case BCH_JSET_ENTRY_blacklist_v2: {
 277                 struct jset_entry_blacklist_v2 *bl_entry =
 278                         container_of(entry, struct jset_entry_blacklist_v2, entry);
 279
 280                 ret = bch2_journal_seq_blacklist_add(c,
 281                                 le64_to_cpu(bl_entry->start),
 282                                 le64_to_cpu(bl_entry->end) + 1);
 283                 break;
 284         }
 285         case BCH_JSET_ENTRY_clock: {
 286                 struct jset_entry_clock *clock =
 287                         container_of(entry, struct jset_entry_clock, entry);
 288
 289                 atomic64_set(&c->io_clock[clock->rw].now, le64_to_cpu(clock->time));
 290         }
 291         }
 292
 293         return ret;
 294 }
 295
 296 static int journal_replay_early(struct bch_fs *c,
 297                                 struct bch_sb_field_clean *clean)
 298 {
 299         struct jset_entry *entry;
 300         int ret;
 301
 302         if (clean) {
 303                 for (entry = clean->start;
 304                      entry != vstruct_end(&clean->field);
 305                      entry = vstruct_next(entry)) {
 306                         ret = journal_replay_entry_early(c, entry);
 307                         if (ret)
 308                                 return ret;
 309                 }
 310         } else {
 311                 struct genradix_iter iter;
 312                 struct journal_replay *i, **_i;
 313
 314                 genradix_for_each(&c->journal_entries, iter, _i) {
 315                         i = *_i;
 316
 317                         if (!i || i->ignore)
 318                                 continue;
 319
 320                         vstruct_for_each(&i->j, entry) {
 321                                 ret = journal_replay_entry_early(c, entry);
 322                                 if (ret)
 323                                         return ret;
 324                         }
 325                 }
 326         }
 327
 328         bch2_fs_usage_initialize(c);
 329
 330         return 0;
 331 }
 332
 333 /* sb clean section: */
 334
 335 static bool btree_id_is_alloc(enum btree_id id)
 336 {
 337         switch (id) {
 338         case BTREE_ID_alloc:
 339         case BTREE_ID_backpointers:
 340         case BTREE_ID_need_discard:
 341         case BTREE_ID_freespace:
 342         case BTREE_ID_bucket_gens:
 343                 return true;
 344         default:
 345                 return false;
 346         }
 347 }
 348
 349 static int read_btree_roots(struct bch_fs *c)
 350 {
 351         unsigned i;
 352         int ret = 0;
 353
 354         for (i = 0; i < btree_id_nr_alive(c); i++) {
 355                 struct btree_root *r = bch2_btree_id_root(c, i);
 356
 357                 if (!r->alive)
 358                         continue;
 359
 360                 if (btree_id_is_alloc(i) &&
 361                     c->opts.reconstruct_alloc) {
 362                         c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 363                         continue;
 364                 }
 365
 366                 if (r->error) {
 367                         __fsck_err(c, btree_id_is_alloc(i)
 368                                    ? FSCK_CAN_IGNORE : 0,
 369                                    "invalid btree root %s",
 370                                    bch2_btree_ids[i]);
 371                         if (i == BTREE_ID_alloc)
 372                                 c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 373                 }
 374
 375                 ret = bch2_btree_root_read(c, i, &r->key, r->level);
 376                 if (ret) {
 377                         fsck_err(c,
 378                                  "error reading btree root %s",
 379                                  bch2_btree_ids[i]);
 380                         if (btree_id_is_alloc(i))
 381                                 c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 382                         ret = 0;
 383                 }
 384         }
 385
 386         for (i = 0; i < BTREE_ID_NR; i++) {
 387                 struct btree_root *r = bch2_btree_id_root(c, i);
 388
 389                 if (!r->b) {
 390                         r->alive = false;
 391                         r->level = 0;
 392                         bch2_btree_root_alloc(c, i);
 393                 }
 394         }
 395 fsck_err:
 396         return ret;
 397 }
 398
 399 static int bch2_initialize_subvolumes(struct bch_fs *c)
 400 {
 401         struct bkey_i_snapshot_tree     root_tree;
 402         struct bkey_i_snapshot          root_snapshot;
 403         struct bkey_i_subvolume         root_volume;
 404         int ret;
 405
 406         bkey_snapshot_tree_init(&root_tree.k_i);
 407         root_tree.k.p.offset            = 1;
 408         root_tree.v.master_subvol       = cpu_to_le32(1);
 409         root_tree.v.root_snapshot       = cpu_to_le32(U32_MAX);
 410
 411         bkey_snapshot_init(&root_snapshot.k_i);
 412         root_snapshot.k.p.offset = U32_MAX;
 413         root_snapshot.v.flags   = 0;
 414         root_snapshot.v.parent  = 0;
 415         root_snapshot.v.subvol  = cpu_to_le32(BCACHEFS_ROOT_SUBVOL);
 416         root_snapshot.v.tree    = cpu_to_le32(1);
 417         SET_BCH_SNAPSHOT_SUBVOL(&root_snapshot.v, true);
 418
 419         bkey_subvolume_init(&root_volume.k_i);
 420         root_volume.k.p.offset = BCACHEFS_ROOT_SUBVOL;
 421         root_volume.v.flags     = 0;
 422         root_volume.v.snapshot  = cpu_to_le32(U32_MAX);
 423         root_volume.v.inode     = cpu_to_le64(BCACHEFS_ROOT_INO);
 424
 425         ret =   bch2_btree_insert(c, BTREE_ID_snapshot_trees,   &root_tree.k_i, NULL, 0) ?:
 426                 bch2_btree_insert(c, BTREE_ID_snapshots,        &root_snapshot.k_i, NULL, 0) ?:
 427                 bch2_btree_insert(c, BTREE_ID_subvolumes,       &root_volume.k_i, NULL, 0);
 428         if (ret)
 429                 bch_err_fn(c, ret);
 430         return ret;
 431 }
 432
 433 static int __bch2_fs_upgrade_for_subvolumes(struct btree_trans *trans)
 434 {
 435         struct btree_iter iter;
 436         struct bkey_s_c k;
 437         struct bch_inode_unpacked inode;
 438         int ret;
 439
 440         k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_inodes,
 441                                SPOS(0, BCACHEFS_ROOT_INO, U32_MAX), 0);
 442         ret = bkey_err(k);
 443         if (ret)
 444                 return ret;
 445
 446         if (!bkey_is_inode(k.k)) {
 447                 bch_err(trans->c, "root inode not found");
 448                 ret = -BCH_ERR_ENOENT_inode;
 449                 goto err;
 450         }
 451
 452         ret = bch2_inode_unpack(k, &inode);
 453         BUG_ON(ret);
 454
 455         inode.bi_subvol = BCACHEFS_ROOT_SUBVOL;
 456
 457         ret = bch2_inode_write(trans, &iter, &inode);
 458 err:
 459         bch2_trans_iter_exit(trans, &iter);
 460         return ret;
 461 }
 462
 463 /* set bi_subvol on root inode */
 464 noinline_for_stack
 465 static int bch2_fs_upgrade_for_subvolumes(struct bch_fs *c)
 466 {
 467         int ret = bch2_trans_do(c, NULL, NULL, BTREE_INSERT_LAZY_RW,
 468                                 __bch2_fs_upgrade_for_subvolumes(trans));
 469         if (ret)
 470                 bch_err_fn(c, ret);
 471         return ret;
 472 }
 473
 474 const char * const bch2_recovery_passes[] = {
 475 #define x(_fn, _when)   #_fn,
 476         BCH_RECOVERY_PASSES()
 477 #undef x
 478         NULL
 479 };
 480
 481 static int bch2_check_allocations(struct bch_fs *c)
 482 {
 483         return bch2_gc(c, true, c->opts.norecovery);
 484 }
 485
 486 static int bch2_set_may_go_rw(struct bch_fs *c)
 487 {
 488         set_bit(BCH_FS_MAY_GO_RW, &c->flags);
 489         return 0;
 490 }
 491
 492 struct recovery_pass_fn {
 493         int             (*fn)(struct bch_fs *);
 494         unsigned        when;
 495 };
 496
 497 static struct recovery_pass_fn recovery_pass_fns[] = {
 498 #define x(_fn, _when)   { .fn = bch2_##_fn, .when = _when },
 499         BCH_RECOVERY_PASSES()
 500 #undef x
 501 };
 502
 503 static void check_version_upgrade(struct bch_fs *c)
 504 {
 505         unsigned latest_compatible = bch2_latest_compatible_version(c->sb.version);
 506         unsigned latest_version = bcachefs_metadata_version_current;
 507         unsigned old_version = c->sb.version_upgrade_complete ?: c->sb.version;
 508         unsigned new_version = 0;
 509         u64 recovery_passes;
 510
 511         if (old_version < bcachefs_metadata_required_upgrade_below) {
 512                 if (c->opts.version_upgrade == BCH_VERSION_UPGRADE_incompatible ||
 513                     latest_compatible < bcachefs_metadata_required_upgrade_below)
 514                         new_version = latest_version;
 515                 else
 516                         new_version = latest_compatible;
 517         } else {
 518                 switch (c->opts.version_upgrade) {
 519                 case BCH_VERSION_UPGRADE_compatible:
 520                         new_version = latest_compatible;
 521                         break;
 522                 case BCH_VERSION_UPGRADE_incompatible:
 523                         new_version = latest_version;
 524                         break;
 525                 case BCH_VERSION_UPGRADE_none:
 526                         new_version = old_version;
 527                         break;
 528                 }
 529         }
 530
 531         if (new_version > old_version) {
 532                 struct printbuf buf = PRINTBUF;
 533
 534                 if (old_version < bcachefs_metadata_required_upgrade_below)
 535                         prt_str(&buf, "Version upgrade required:\n");
 536
 537                 if (old_version != c->sb.version) {
 538                         prt_str(&buf, "Version upgrade from ");
 539                         bch2_version_to_text(&buf, c->sb.version_upgrade_complete);
 540                         prt_str(&buf, " to ");
 541                         bch2_version_to_text(&buf, c->sb.version);
 542                         prt_str(&buf, " incomplete\n");
 543                 }
 544
 545                 prt_printf(&buf, "Doing %s version upgrade from ",
 546                            BCH_VERSION_MAJOR(old_version) != BCH_VERSION_MAJOR(new_version)
 547                            ? "incompatible" : "compatible");
 548                 bch2_version_to_text(&buf, old_version);
 549                 prt_str(&buf, " to ");
 550                 bch2_version_to_text(&buf, new_version);
 551                 prt_newline(&buf);
 552
 553                 recovery_passes = bch2_upgrade_recovery_passes(c, old_version, new_version);
 554                 if (recovery_passes) {
 555                         if ((recovery_passes & RECOVERY_PASS_ALL_FSCK) == RECOVERY_PASS_ALL_FSCK)
 556                                 prt_str(&buf, "fsck required");
 557                         else {
 558                                 prt_str(&buf, "running recovery passes: ");
 559                                 prt_bitflags(&buf, bch2_recovery_passes, recovery_passes);
 560                         }
 561
 562                         c->recovery_passes_explicit |= recovery_passes;
 563                         c->opts.fix_errors = FSCK_FIX_yes;
 564                 }
 565
 566                 bch_info(c, "%s", buf.buf);
 567
 568                 mutex_lock(&c->sb_lock);
 569                 bch2_sb_upgrade(c, new_version);
 570                 mutex_unlock(&c->sb_lock);
 571
 572                 printbuf_exit(&buf);
 573         }
 574 }
 575
 576 u64 bch2_fsck_recovery_passes(void)
 577 {
 578         u64 ret = 0;
 579
 580         for (unsigned i = 0; i < ARRAY_SIZE(recovery_pass_fns); i++)
 581                 if (recovery_pass_fns[i].when & PASS_FSCK)
 582                         ret |= BIT_ULL(i);
 583         return ret;
 584 }
 585
 586 static bool should_run_recovery_pass(struct bch_fs *c, enum bch_recovery_pass pass)
 587 {
 588         struct recovery_pass_fn *p = recovery_pass_fns + c->curr_recovery_pass;
 589
 590         if (c->opts.norecovery && pass > BCH_RECOVERY_PASS_snapshots_read)
 591                 return false;
 592         if (c->recovery_passes_explicit & BIT_ULL(pass))
 593                 return true;
 594         if ((p->when & PASS_FSCK) && c->opts.fsck)
 595                 return true;
 596         if ((p->when & PASS_UNCLEAN) && !c->sb.clean)
 597                 return true;
 598         if (p->when & PASS_ALWAYS)
 599                 return true;
 600         return false;
 601 }
 602
 603 static int bch2_run_recovery_pass(struct bch_fs *c, enum bch_recovery_pass pass)
 604 {
 605         int ret;
 606
 607         c->curr_recovery_pass = pass;
 608
 609         if (should_run_recovery_pass(c, pass)) {
 610                 struct recovery_pass_fn *p = recovery_pass_fns + pass;
 611
 612                 if (!(p->when & PASS_SILENT))
 613                         printk(KERN_INFO bch2_log_msg(c, "%s..."),
 614                                bch2_recovery_passes[pass]);
 615                 ret = p->fn(c);
 616                 if (ret)
 617                         return ret;
 618                 if (!(p->when & PASS_SILENT))
 619                         printk(KERN_CONT " done\n");
 620
 621                 c->recovery_passes_complete |= BIT_ULL(pass);
 622         }
 623
 624         return 0;
 625 }
 626
 627 static int bch2_run_recovery_passes(struct bch_fs *c)
 628 {
 629         int ret = 0;
 630
 631         while (c->curr_recovery_pass < ARRAY_SIZE(recovery_pass_fns)) {
 632                 ret = bch2_run_recovery_pass(c, c->curr_recovery_pass);
 633                 if (bch2_err_matches(ret, BCH_ERR_restart_recovery))
 634                         continue;
 635                 if (ret)
 636                         break;
 637                 c->curr_recovery_pass++;
 638         }
 639
 640         return ret;
 641 }
 642
 643 int bch2_fs_recovery(struct bch_fs *c)
 644 {
 645         struct bch_sb_field_clean *clean = NULL;
 646         struct jset *last_journal_entry = NULL;
 647         u64 last_seq = 0, blacklist_seq, journal_seq;
 648         bool write_sb = false;
 649         int ret = 0;
 650
 651         if (c->sb.clean) {
 652                 clean = bch2_read_superblock_clean(c);
 653                 ret = PTR_ERR_OR_ZERO(clean);
 654                 if (ret)
 655                         goto err;
 656
 657                 bch_info(c, "recovering from clean shutdown, journal seq %llu",
 658                          le64_to_cpu(clean->journal_seq));
 659         } else {
 660                 bch_info(c, "recovering from unclean shutdown");
 661         }
 662
 663         if (!(c->sb.features & (1ULL << BCH_FEATURE_new_extent_overwrite))) {
 664                 bch_err(c, "feature new_extent_overwrite not set, filesystem no longer supported");
 665                 ret = -EINVAL;
 666                 goto err;
 667         }
 668
 669         if (!c->sb.clean &&
 670             !(c->sb.features & (1ULL << BCH_FEATURE_extents_above_btree_updates))) {
 671                 bch_err(c, "filesystem needs recovery from older version; run fsck from older bcachefs-tools to fix");
 672                 ret = -EINVAL;
 673                 goto err;
 674         }
 675
 676         if (c->opts.fsck || !(c->opts.nochanges && c->opts.norecovery))
 677                 check_version_upgrade(c);
 678
 679         if (c->opts.fsck && c->opts.norecovery) {
 680                 bch_err(c, "cannot select both norecovery and fsck");
 681                 ret = -EINVAL;
 682                 goto err;
 683         }
 684
 685         ret = bch2_blacklist_table_initialize(c);
 686         if (ret) {
 687                 bch_err(c, "error initializing blacklist table");
 688                 goto err;
 689         }
 690
 691         if (!c->sb.clean || c->opts.fsck || c->opts.keep_journal) {
 692                 struct genradix_iter iter;
 693                 struct journal_replay **i;
 694
 695                 bch_verbose(c, "starting journal read");
 696                 ret = bch2_journal_read(c, &last_seq, &blacklist_seq, &journal_seq);
 697                 if (ret)
 698                         goto err;
 699
 700                 /*
 701                  * note: cmd_list_journal needs the blacklist table fully up to date so
 702                  * it can asterisk ignored journal entries:
 703                  */
 704                 if (c->opts.read_journal_only)
 705                         goto out;
 706
 707                 genradix_for_each_reverse(&c->journal_entries, iter, i)
 708                         if (*i && !(*i)->ignore) {
 709                                 last_journal_entry = &(*i)->j;
 710                                 break;
 711                         }
 712
 713                 if (mustfix_fsck_err_on(c->sb.clean &&
 714                                         last_journal_entry &&
 715                                         !journal_entry_empty(last_journal_entry), c,
 716                                 "filesystem marked clean but journal not empty")) {
 717                         c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 718                         SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
 719                         c->sb.clean = false;
 720                 }
 721
 722                 if (!last_journal_entry) {
 723                         fsck_err_on(!c->sb.clean, c, "no journal entries found");
 724                         if (clean)
 725                                 goto use_clean;
 726
 727                         genradix_for_each_reverse(&c->journal_entries, iter, i)
 728                                 if (*i) {
 729                                         last_journal_entry = &(*i)->j;
 730                                         (*i)->ignore = false;
 731                                         break;
 732                                 }
 733                 }
 734
 735                 ret = bch2_journal_keys_sort(c);
 736                 if (ret)
 737                         goto err;
 738
 739                 if (c->sb.clean && last_journal_entry) {
 740                         ret = bch2_verify_superblock_clean(c, &clean,
 741                                                       last_journal_entry);
 742                         if (ret)
 743                                 goto err;
 744                 }
 745         } else {
 746 use_clean:
 747                 if (!clean) {
 748                         bch_err(c, "no superblock clean section found");
 749                         ret = -BCH_ERR_fsck_repair_impossible;
 750                         goto err;
 751
 752                 }
 753                 blacklist_seq = journal_seq = le64_to_cpu(clean->journal_seq) + 1;
 754         }
 755
 756         c->journal_replay_seq_start     = last_seq;
 757         c->journal_replay_seq_end       = blacklist_seq - 1;
 758
 759         if (c->opts.reconstruct_alloc) {
 760                 c->sb.compat &= ~(1ULL << BCH_COMPAT_alloc_info);
 761                 drop_alloc_keys(&c->journal_keys);
 762         }
 763
 764         zero_out_btree_mem_ptr(&c->journal_keys);
 765
 766         ret = journal_replay_early(c, clean);
 767         if (ret)
 768                 goto err;
 769
 770         /*
 771          * After an unclean shutdown, skip then next few journal sequence
 772          * numbers as they may have been referenced by btree writes that
 773          * happened before their corresponding journal writes - those btree
 774          * writes need to be ignored, by skipping and blacklisting the next few
 775          * journal sequence numbers:
 776          */
 777         if (!c->sb.clean)
 778                 journal_seq += 8;
 779
 780         if (blacklist_seq != journal_seq) {
 781                 ret =   bch2_journal_log_msg(c, "blacklisting entries %llu-%llu",
 782                                              blacklist_seq, journal_seq) ?:
 783                         bch2_journal_seq_blacklist_add(c,
 784                                         blacklist_seq, journal_seq);
 785                 if (ret) {
 786                         bch_err(c, "error creating new journal seq blacklist entry");
 787                         goto err;
 788                 }
 789         }
 790
 791         ret =   bch2_journal_log_msg(c, "starting journal at entry %llu, replaying %llu-%llu",
 792                                      journal_seq, last_seq, blacklist_seq - 1) ?:
 793                 bch2_fs_journal_start(&c->journal, journal_seq);
 794         if (ret)
 795                 goto err;
 796
 797         if (c->opts.reconstruct_alloc)
 798                 bch2_journal_log_msg(c, "dropping alloc info");
 799
 800         /*
 801          * Skip past versions that might have possibly been used (as nonces),
 802          * but hadn't had their pointers written:
 803          */
 804         if (c->sb.encryption_type && !c->sb.clean)
 805                 atomic64_add(1 << 16, &c->key_version);
 806
 807         ret = read_btree_roots(c);
 808         if (ret)
 809                 goto err;
 810
 811         if (c->opts.fsck &&
 812             (IS_ENABLED(CONFIG_BCACHEFS_DEBUG) ||
 813              BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb)))
 814                 c->recovery_passes_explicit |= BIT_ULL(BCH_RECOVERY_PASS_check_topology);
 815
 816         ret = bch2_run_recovery_passes(c);
 817         if (ret)
 818                 goto err;
 819
 820         /* If we fixed errors, verify that fs is actually clean now: */
 821         if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG) &&
 822             test_bit(BCH_FS_ERRORS_FIXED, &c->flags) &&
 823             !test_bit(BCH_FS_ERRORS_NOT_FIXED, &c->flags) &&
 824             !test_bit(BCH_FS_ERROR, &c->flags)) {
 825                 bch_info(c, "Fixed errors, running fsck a second time to verify fs is clean");
 826                 clear_bit(BCH_FS_ERRORS_FIXED, &c->flags);
 827
 828                 c->curr_recovery_pass = BCH_RECOVERY_PASS_check_alloc_info;
 829
 830                 ret = bch2_run_recovery_passes(c);
 831                 if (ret)
 832                         goto err;
 833
 834                 if (test_bit(BCH_FS_ERRORS_FIXED, &c->flags) ||
 835                     test_bit(BCH_FS_ERRORS_NOT_FIXED, &c->flags)) {
 836                         bch_err(c, "Second fsck run was not clean");
 837                         set_bit(BCH_FS_ERRORS_NOT_FIXED, &c->flags);
 838                 }
 839
 840                 set_bit(BCH_FS_ERRORS_FIXED, &c->flags);
 841         }
 842
 843         if (enabled_qtypes(c)) {
 844                 bch_verbose(c, "reading quotas");
 845                 ret = bch2_fs_quota_read(c);
 846                 if (ret)
 847                         goto err;
 848                 bch_verbose(c, "quotas done");
 849         }
 850
 851         mutex_lock(&c->sb_lock);
 852         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) != c->sb.version) {
 853                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, c->sb.version);
 854                 write_sb = true;
 855         }
 856
 857         if (!test_bit(BCH_FS_ERROR, &c->flags)) {
 858                 c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_info);
 859                 write_sb = true;
 860         }
 861
 862         if (c->opts.fsck &&
 863             !test_bit(BCH_FS_ERROR, &c->flags) &&
 864             !test_bit(BCH_FS_ERRORS_NOT_FIXED, &c->flags)) {
 865                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 0);
 866                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 0);
 867                 write_sb = true;
 868         }
 869
 870         if (write_sb)
 871                 bch2_write_super(c);
 872         mutex_unlock(&c->sb_lock);
 873
 874         if (!(c->sb.compat & (1ULL << BCH_COMPAT_extents_above_btree_updates_done)) ||
 875             c->sb.version_min < bcachefs_metadata_version_btree_ptr_sectors_written) {
 876                 struct bch_move_stats stats;
 877
 878                 bch2_move_stats_init(&stats, "recovery");
 879
 880                 bch_info(c, "scanning for old btree nodes");
 881                 ret =   bch2_fs_read_write(c) ?:
 882                         bch2_scan_old_btree_nodes(c, &stats);
 883                 if (ret)
 884                         goto err;
 885                 bch_info(c, "scanning for old btree nodes done");
 886         }
 887
 888         if (c->journal_seq_blacklist_table &&
 889             c->journal_seq_blacklist_table->nr > 128)
 890                 queue_work(system_long_wq, &c->journal_seq_blacklist_gc_work);
 891
 892         ret = 0;
 893 out:
 894         set_bit(BCH_FS_FSCK_DONE, &c->flags);
 895         bch2_flush_fsck_errs(c);
 896
 897         if (!c->opts.keep_journal &&
 898             test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags)) {
 899                 bch2_journal_keys_free(&c->journal_keys);
 900                 bch2_journal_entries_free(c);
 901         }
 902         kfree(clean);
 903
 904         if (!ret && test_bit(BCH_FS_HAVE_DELETED_SNAPSHOTS, &c->flags)) {
 905                 bch2_fs_read_write_early(c);
 906                 bch2_delete_dead_snapshots_async(c);
 907         }
 908
 909         if (ret)
 910                 bch_err_fn(c, ret);
 911         return ret;
 912 err:
 913 fsck_err:
 914         bch2_fs_emergency_read_only(c);
 915         goto out;
 916 }
 917
 918 int bch2_fs_initialize(struct bch_fs *c)
 919 {
 920         struct bch_inode_unpacked root_inode, lostfound_inode;
 921         struct bkey_inode_buf packed_inode;
 922         struct qstr lostfound = QSTR("lost+found");
 923         struct bch_dev *ca;
 924         unsigned i;
 925         int ret;
 926
 927         bch_notice(c, "initializing new filesystem");
 928
 929         mutex_lock(&c->sb_lock);
 930         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_extents_above_btree_updates_done);
 931         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_bformat_overflow_done);
 932
 933         bch2_sb_maybe_downgrade(c);
 934
 935         if (c->opts.version_upgrade != BCH_VERSION_UPGRADE_none) {
 936                 bch2_sb_upgrade(c, bcachefs_metadata_version_current);
 937                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
 938                 bch2_write_super(c);
 939         }
 940         mutex_unlock(&c->sb_lock);
 941
 942         c->curr_recovery_pass = ARRAY_SIZE(recovery_pass_fns);
 943         set_bit(BCH_FS_MAY_GO_RW, &c->flags);
 944         set_bit(BCH_FS_FSCK_DONE, &c->flags);
 945
 946         for (i = 0; i < BTREE_ID_NR; i++)
 947                 bch2_btree_root_alloc(c, i);
 948
 949         for_each_online_member(ca, c, i)
 950                 bch2_dev_usage_init(ca);
 951
 952         for_each_online_member(ca, c, i) {
 953                 ret = bch2_dev_journal_alloc(ca);
 954                 if (ret) {
 955                         percpu_ref_put(&ca->io_ref);
 956                         goto err;
 957                 }
 958         }
 959
 960         /*
 961          * journal_res_get() will crash if called before this has
 962          * set up the journal.pin FIFO and journal.cur pointer:
 963          */
 964         bch2_fs_journal_start(&c->journal, 1);
 965         bch2_journal_set_replay_done(&c->journal);
 966
 967         ret = bch2_fs_read_write_early(c);
 968         if (ret)
 969                 goto err;
 970
 971         /*
 972          * Write out the superblock and journal buckets, now that we can do
 973          * btree updates
 974          */
 975         bch_verbose(c, "marking superblocks");
 976         for_each_member_device(ca, c, i) {
 977                 ret = bch2_trans_mark_dev_sb(c, ca);
 978                 if (ret) {
 979                         percpu_ref_put(&ca->ref);
 980                         goto err;
 981                 }
 982
 983                 ca->new_fs_bucket_idx = 0;
 984         }
 985
 986         ret = bch2_fs_freespace_init(c);
 987         if (ret)
 988                 goto err;
 989
 990         ret = bch2_initialize_subvolumes(c);
 991         if (ret)
 992                 goto err;
 993
 994         bch_verbose(c, "reading snapshots table");
 995         ret = bch2_snapshots_read(c);
 996         if (ret)
 997                 goto err;
 998         bch_verbose(c, "reading snapshots done");
 999
1000         bch2_inode_init(c, &root_inode, 0, 0, S_IFDIR|0755, 0, NULL);
1001         root_inode.bi_inum      = BCACHEFS_ROOT_INO;
1002         root_inode.bi_subvol    = BCACHEFS_ROOT_SUBVOL;
1003         bch2_inode_pack(&packed_inode, &root_inode);
1004         packed_inode.inode.k.p.snapshot = U32_MAX;
1005
1006         ret = bch2_btree_insert(c, BTREE_ID_inodes, &packed_inode.inode.k_i, NULL, 0);
1007         if (ret) {
1008                 bch_err_msg(c, ret, "creating root directory");
1009                 goto err;
1010         }
1011
1012         bch2_inode_init_early(c, &lostfound_inode);
1013
1014         ret = bch2_trans_do(c, NULL, NULL, 0,
1015                 bch2_create_trans(trans,
1016                                   BCACHEFS_ROOT_SUBVOL_INUM,
1017                                   &root_inode, &lostfound_inode,
1018                                   &lostfound,
1019                                   0, 0, S_IFDIR|0700, 0,
1020                                   NULL, NULL, (subvol_inum) { 0 }, 0));
1021         if (ret) {
1022                 bch_err_msg(c, ret, "creating lost+found");
1023                 goto err;
1024         }
1025
1026         if (enabled_qtypes(c)) {
1027                 ret = bch2_fs_quota_read(c);
1028                 if (ret)
1029                         goto err;
1030         }
1031
1032         ret = bch2_journal_flush(&c->journal);
1033         if (ret) {
1034                 bch_err_msg(c, ret, "writing first journal entry");
1035                 goto err;
1036         }
1037
1038         mutex_lock(&c->sb_lock);
1039         SET_BCH_SB_INITIALIZED(c->disk_sb.sb, true);
1040         SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
1041
1042         bch2_write_super(c);
1043         mutex_unlock(&c->sb_lock);
1044
1045         return 0;
1046 err:
1047         bch_err_fn(ca, ret);
1048         return ret;
1049 }