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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "checksum.h"
   5 #include "counters.h"
   6 #include "disk_groups.h"
   7 #include "ec.h"
   8 #include "error.h"
   9 #include "journal.h"
  10 #include "journal_sb.h"
  11 #include "journal_seq_blacklist.h"
  12 #include "recovery.h"
  13 #include "replicas.h"
  14 #include "quota.h"
  15 #include "sb-clean.h"
  16 #include "sb-members.h"
  17 #include "super-io.h"
  18 #include "super.h"
  19 #include "trace.h"
  20 #include "vstructs.h"
  21
  22 #include <linux/backing-dev.h>
  23 #include <linux/sort.h>
  24
  25 static const struct blk_holder_ops bch2_sb_handle_bdev_ops = {
  26 };
  27
  28 struct bch2_metadata_version {
  29         u16             version;
  30         const char      *name;
  31         u64             recovery_passes;
  32 };
  33
  34 static const struct bch2_metadata_version bch2_metadata_versions[] = {
  35 #define x(n, v, _recovery_passes) {             \
  36         .version = v,                           \
  37         .name = #n,                             \
  38         .recovery_passes = _recovery_passes,    \
  39 },
  40         BCH_METADATA_VERSIONS()
  41 #undef x
  42 };
  43
  44 void bch2_version_to_text(struct printbuf *out, unsigned v)
  45 {
  46         const char *str = "(unknown version)";
  47
  48         for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
  49                 if (bch2_metadata_versions[i].version == v) {
  50                         str = bch2_metadata_versions[i].name;
  51                         break;
  52                 }
  53
  54         prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str);
  55 }
  56
  57 unsigned bch2_latest_compatible_version(unsigned v)
  58 {
  59         if (!BCH_VERSION_MAJOR(v))
  60                 return v;
  61
  62         for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
  63                 if (bch2_metadata_versions[i].version > v &&
  64                     BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) ==
  65                     BCH_VERSION_MAJOR(v))
  66                         v = bch2_metadata_versions[i].version;
  67
  68         return v;
  69 }
  70
  71 u64 bch2_upgrade_recovery_passes(struct bch_fs *c,
  72                                  unsigned old_version,
  73                                  unsigned new_version)
  74 {
  75         u64 ret = 0;
  76
  77         for (const struct bch2_metadata_version *i = bch2_metadata_versions;
  78              i < bch2_metadata_versions + ARRAY_SIZE(bch2_metadata_versions);
  79              i++)
  80                 if (i->version > old_version && i->version <= new_version) {
  81                         if (i->recovery_passes & RECOVERY_PASS_ALL_FSCK)
  82                                 ret |= bch2_fsck_recovery_passes();
  83                         ret |= i->recovery_passes;
  84                 }
  85
  86         return ret &= ~RECOVERY_PASS_ALL_FSCK;
  87 }
  88
  89 const char * const bch2_sb_fields[] = {
  90 #define x(name, nr)     #name,
  91         BCH_SB_FIELDS()
  92 #undef x
  93         NULL
  94 };
  95
  96 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
  97                                   struct printbuf *);
  98
  99 struct bch_sb_field *bch2_sb_field_get(struct bch_sb *sb,
 100                                       enum bch_sb_field_type type)
 101 {
 102         struct bch_sb_field *f;
 103
 104         /* XXX: need locking around superblock to access optional fields */
 105
 106         vstruct_for_each(sb, f)
 107                 if (le32_to_cpu(f->type) == type)
 108                         return f;
 109         return NULL;
 110 }
 111
 112 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
 113                                                    struct bch_sb_field *f,
 114                                                    unsigned u64s)
 115 {
 116         unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 117         unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
 118
 119         BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
 120
 121         if (!f && !u64s) {
 122                 /* nothing to do: */
 123         } else if (!f) {
 124                 f = vstruct_last(sb->sb);
 125                 memset(f, 0, sizeof(u64) * u64s);
 126                 f->u64s = cpu_to_le32(u64s);
 127                 f->type = 0;
 128         } else {
 129                 void *src, *dst;
 130
 131                 src = vstruct_end(f);
 132
 133                 if (u64s) {
 134                         f->u64s = cpu_to_le32(u64s);
 135                         dst = vstruct_end(f);
 136                 } else {
 137                         dst = f;
 138                 }
 139
 140                 memmove(dst, src, vstruct_end(sb->sb) - src);
 141
 142                 if (dst > src)
 143                         memset(src, 0, dst - src);
 144         }
 145
 146         sb->sb->u64s = cpu_to_le32(sb_u64s);
 147
 148         return u64s ? f : NULL;
 149 }
 150
 151 void bch2_sb_field_delete(struct bch_sb_handle *sb,
 152                           enum bch_sb_field_type type)
 153 {
 154         struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
 155
 156         if (f)
 157                 __bch2_sb_field_resize(sb, f, 0);
 158 }
 159
 160 /* Superblock realloc/free: */
 161
 162 void bch2_free_super(struct bch_sb_handle *sb)
 163 {
 164         kfree(sb->bio);
 165         if (!IS_ERR_OR_NULL(sb->bdev))
 166                 blkdev_put(sb->bdev, sb->holder);
 167         kfree(sb->holder);
 168
 169         kfree(sb->sb);
 170         memset(sb, 0, sizeof(*sb));
 171 }
 172
 173 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 174 {
 175         size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
 176         size_t new_buffer_size;
 177         struct bch_sb *new_sb;
 178         struct bio *bio;
 179
 180         if (sb->bdev)
 181                 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
 182
 183         new_buffer_size = roundup_pow_of_two(new_bytes);
 184
 185         if (sb->sb && sb->buffer_size >= new_buffer_size)
 186                 return 0;
 187
 188         if (sb->sb && sb->have_layout) {
 189                 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
 190
 191                 if (new_bytes > max_bytes) {
 192                         pr_err("%pg: superblock too big: want %zu but have %llu",
 193                                sb->bdev, new_bytes, max_bytes);
 194                         return -BCH_ERR_ENOSPC_sb;
 195                 }
 196         }
 197
 198         if (sb->buffer_size >= new_buffer_size && sb->sb)
 199                 return 0;
 200
 201         if (dynamic_fault("bcachefs:add:super_realloc"))
 202                 return -BCH_ERR_ENOMEM_sb_realloc_injected;
 203
 204         new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
 205         if (!new_sb)
 206                 return -BCH_ERR_ENOMEM_sb_buf_realloc;
 207
 208         sb->sb = new_sb;
 209
 210         if (sb->have_bio) {
 211                 unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size);
 212
 213                 bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
 214                 if (!bio)
 215                         return -BCH_ERR_ENOMEM_sb_bio_realloc;
 216
 217                 bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
 218
 219                 kfree(sb->bio);
 220                 sb->bio = bio;
 221         }
 222
 223         sb->buffer_size = new_buffer_size;
 224
 225         return 0;
 226 }
 227
 228 struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *sb,
 229                                           enum bch_sb_field_type type,
 230                                           unsigned u64s)
 231 {
 232         struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
 233         ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 234         ssize_t d = -old_u64s + u64s;
 235
 236         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
 237                 return NULL;
 238
 239         if (sb->fs_sb) {
 240                 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
 241                 struct bch_dev *ca;
 242                 unsigned i;
 243
 244                 lockdep_assert_held(&c->sb_lock);
 245
 246                 /* XXX: we're not checking that offline device have enough space */
 247
 248                 for_each_online_member(ca, c, i) {
 249                         struct bch_sb_handle *dev_sb = &ca->disk_sb;
 250
 251                         if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
 252                                 percpu_ref_put(&ca->ref);
 253                                 return NULL;
 254                         }
 255                 }
 256         }
 257
 258         f = bch2_sb_field_get(sb->sb, type);
 259         f = __bch2_sb_field_resize(sb, f, u64s);
 260         if (f)
 261                 f->type = cpu_to_le32(type);
 262         return f;
 263 }
 264
 265 /* Superblock validate: */
 266
 267 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
 268 {
 269         u64 offset, prev_offset, max_sectors;
 270         unsigned i;
 271
 272         BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
 273
 274         if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
 275             !uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
 276                 prt_printf(out, "Not a bcachefs superblock layout");
 277                 return -BCH_ERR_invalid_sb_layout;
 278         }
 279
 280         if (layout->layout_type != 0) {
 281                 prt_printf(out, "Invalid superblock layout type %u",
 282                        layout->layout_type);
 283                 return -BCH_ERR_invalid_sb_layout_type;
 284         }
 285
 286         if (!layout->nr_superblocks) {
 287                 prt_printf(out, "Invalid superblock layout: no superblocks");
 288                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 289         }
 290
 291         if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
 292                 prt_printf(out, "Invalid superblock layout: too many superblocks");
 293                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 294         }
 295
 296         max_sectors = 1 << layout->sb_max_size_bits;
 297
 298         prev_offset = le64_to_cpu(layout->sb_offset[0]);
 299
 300         for (i = 1; i < layout->nr_superblocks; i++) {
 301                 offset = le64_to_cpu(layout->sb_offset[i]);
 302
 303                 if (offset < prev_offset + max_sectors) {
 304                         prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
 305                                "  (sb %u ends at %llu next starts at %llu",
 306                                i - 1, prev_offset + max_sectors, offset);
 307                         return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
 308                 }
 309                 prev_offset = offset;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out)
 316 {
 317         u16 version             = le16_to_cpu(sb->version);
 318         u16 version_min         = le16_to_cpu(sb->version_min);
 319
 320         if (!bch2_version_compatible(version)) {
 321                 prt_str(out, "Unsupported superblock version ");
 322                 bch2_version_to_text(out, version);
 323                 prt_str(out, " (min ");
 324                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 325                 prt_str(out, ", max ");
 326                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 327                 prt_str(out, ")");
 328                 return -BCH_ERR_invalid_sb_version;
 329         }
 330
 331         if (!bch2_version_compatible(version_min)) {
 332                 prt_str(out, "Unsupported superblock version_min ");
 333                 bch2_version_to_text(out, version_min);
 334                 prt_str(out, " (min ");
 335                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 336                 prt_str(out, ", max ");
 337                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 338                 prt_str(out, ")");
 339                 return -BCH_ERR_invalid_sb_version;
 340         }
 341
 342         if (version_min > version) {
 343                 prt_str(out, "Bad minimum version ");
 344                 bch2_version_to_text(out, version_min);
 345                 prt_str(out, ", greater than version field ");
 346                 bch2_version_to_text(out, version);
 347                 return -BCH_ERR_invalid_sb_version;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 354                             int rw)
 355 {
 356         struct bch_sb *sb = disk_sb->sb;
 357         struct bch_sb_field *f;
 358         struct bch_sb_field_members *mi;
 359         enum bch_opt_id opt_id;
 360         u16 block_size;
 361         int ret;
 362
 363         ret = bch2_sb_compatible(sb, out);
 364         if (ret)
 365                 return ret;
 366
 367         if (sb->features[1] ||
 368             (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
 369                 prt_printf(out, "Filesystem has incompatible features");
 370                 return -BCH_ERR_invalid_sb_features;
 371         }
 372
 373         block_size = le16_to_cpu(sb->block_size);
 374
 375         if (block_size > PAGE_SECTORS) {
 376                 prt_printf(out, "Block size too big (got %u, max %u)",
 377                        block_size, PAGE_SECTORS);
 378                 return -BCH_ERR_invalid_sb_block_size;
 379         }
 380
 381         if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
 382                 prt_printf(out, "Bad user UUID (got zeroes)");
 383                 return -BCH_ERR_invalid_sb_uuid;
 384         }
 385
 386         if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
 387                 prt_printf(out, "Bad internal UUID (got zeroes)");
 388                 return -BCH_ERR_invalid_sb_uuid;
 389         }
 390
 391         if (!sb->nr_devices ||
 392             sb->nr_devices > BCH_SB_MEMBERS_MAX) {
 393                 prt_printf(out, "Bad number of member devices %u (max %u)",
 394                        sb->nr_devices, BCH_SB_MEMBERS_MAX);
 395                 return -BCH_ERR_invalid_sb_too_many_members;
 396         }
 397
 398         if (sb->dev_idx >= sb->nr_devices) {
 399                 prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
 400                        sb->dev_idx, sb->nr_devices);
 401                 return -BCH_ERR_invalid_sb_dev_idx;
 402         }
 403
 404         if (!sb->time_precision ||
 405             le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
 406                 prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
 407                        le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
 408                 return -BCH_ERR_invalid_sb_time_precision;
 409         }
 410
 411         if (rw == READ) {
 412                 /*
 413                  * Been seeing a bug where these are getting inexplicably
 414                  * zeroed, so we're now validating them, but we have to be
 415                  * careful not to preven people's filesystems from mounting:
 416                  */
 417                 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
 418                         SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 419                 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 420                         SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
 421
 422                 if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb))
 423                         SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version));
 424         }
 425
 426         for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
 427                 const struct bch_option *opt = bch2_opt_table + opt_id;
 428
 429                 if (opt->get_sb != BCH2_NO_SB_OPT) {
 430                         u64 v = bch2_opt_from_sb(sb, opt_id);
 431
 432                         prt_printf(out, "Invalid option ");
 433                         ret = bch2_opt_validate(opt, v, out);
 434                         if (ret)
 435                                 return ret;
 436
 437                         printbuf_reset(out);
 438                 }
 439         }
 440
 441         /* validate layout */
 442         ret = validate_sb_layout(&sb->layout, out);
 443         if (ret)
 444                 return ret;
 445
 446         vstruct_for_each(sb, f) {
 447                 if (!f->u64s) {
 448                         prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
 449                                le32_to_cpu(f->type));
 450                         return -BCH_ERR_invalid_sb_field_size;
 451                 }
 452
 453                 if (vstruct_next(f) > vstruct_last(sb)) {
 454                         prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
 455                                le32_to_cpu(f->type));
 456                         return -BCH_ERR_invalid_sb_field_size;
 457                 }
 458         }
 459
 460         /* members must be validated first: */
 461         mi = bch2_sb_get_members(sb);
 462         if (!mi) {
 463                 prt_printf(out, "Invalid superblock: member info area missing");
 464                 return -BCH_ERR_invalid_sb_members_missing;
 465         }
 466
 467         ret = bch2_sb_field_validate(sb, &mi->field, out);
 468         if (ret)
 469                 return ret;
 470
 471         vstruct_for_each(sb, f) {
 472                 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members)
 473                         continue;
 474
 475                 ret = bch2_sb_field_validate(sb, f, out);
 476                 if (ret)
 477                         return ret;
 478         }
 479
 480         return 0;
 481 }
 482
 483 /* device open: */
 484
 485 static void bch2_sb_update(struct bch_fs *c)
 486 {
 487         struct bch_sb *src = c->disk_sb.sb;
 488         struct bch_sb_field_members *mi = bch2_sb_get_members(src);
 489         struct bch_dev *ca;
 490         unsigned i;
 491
 492         lockdep_assert_held(&c->sb_lock);
 493
 494         c->sb.uuid              = src->uuid;
 495         c->sb.user_uuid         = src->user_uuid;
 496         c->sb.version           = le16_to_cpu(src->version);
 497         c->sb.version_min       = le16_to_cpu(src->version_min);
 498         c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
 499         c->sb.nr_devices        = src->nr_devices;
 500         c->sb.clean             = BCH_SB_CLEAN(src);
 501         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
 502
 503         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 504         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
 505
 506         /* XXX this is wrong, we need a 96 or 128 bit integer type */
 507         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
 508                                           c->sb.nsec_per_time_unit);
 509         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
 510
 511         c->sb.features          = le64_to_cpu(src->features[0]);
 512         c->sb.compat            = le64_to_cpu(src->compat[0]);
 513
 514         for_each_member_device(ca, c, i)
 515                 ca->mi = bch2_mi_to_cpu(mi->members + i);
 516 }
 517
 518 static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
 519 {
 520         struct bch_sb_field *src_f, *dst_f;
 521         struct bch_sb *dst = dst_handle->sb;
 522         unsigned i;
 523
 524         dst->version            = src->version;
 525         dst->version_min        = src->version_min;
 526         dst->seq                = src->seq;
 527         dst->uuid               = src->uuid;
 528         dst->user_uuid          = src->user_uuid;
 529         memcpy(dst->label,      src->label, sizeof(dst->label));
 530
 531         dst->block_size         = src->block_size;
 532         dst->nr_devices         = src->nr_devices;
 533
 534         dst->time_base_lo       = src->time_base_lo;
 535         dst->time_base_hi       = src->time_base_hi;
 536         dst->time_precision     = src->time_precision;
 537
 538         memcpy(dst->flags,      src->flags,     sizeof(dst->flags));
 539         memcpy(dst->features,   src->features,  sizeof(dst->features));
 540         memcpy(dst->compat,     src->compat,    sizeof(dst->compat));
 541
 542         for (i = 0; i < BCH_SB_FIELD_NR; i++) {
 543                 int d;
 544
 545                 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
 546                         continue;
 547
 548                 src_f = bch2_sb_field_get(src, i);
 549                 dst_f = bch2_sb_field_get(dst, i);
 550
 551                 d = (src_f ? le32_to_cpu(src_f->u64s) : 0) -
 552                     (dst_f ? le32_to_cpu(dst_f->u64s) : 0);
 553                 if (d > 0) {
 554                         int ret = bch2_sb_realloc(dst_handle,
 555                                         le32_to_cpu(dst_handle->sb->u64s) + d);
 556
 557                         if (ret)
 558                                 return ret;
 559
 560                         dst = dst_handle->sb;
 561                         dst_f = bch2_sb_field_get(dst, i);
 562                 }
 563
 564                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
 565                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
 566
 567                 if (src_f)
 568                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
 569         }
 570
 571         return 0;
 572 }
 573
 574 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
 575 {
 576         int ret;
 577
 578         lockdep_assert_held(&c->sb_lock);
 579
 580         ret =   bch2_sb_realloc(&c->disk_sb, 0) ?:
 581                 __copy_super(&c->disk_sb, src) ?:
 582                 bch2_sb_replicas_to_cpu_replicas(c) ?:
 583                 bch2_sb_disk_groups_to_cpu(c);
 584         if (ret)
 585                 return ret;
 586
 587         bch2_sb_update(c);
 588         return 0;
 589 }
 590
 591 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
 592 {
 593         return __copy_super(&ca->disk_sb, c->disk_sb.sb);
 594 }
 595
 596 /* read superblock: */
 597
 598 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
 599 {
 600         struct bch_csum csum;
 601         size_t bytes;
 602         int ret;
 603 reread:
 604         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 605         sb->bio->bi_iter.bi_sector = offset;
 606         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
 607
 608         ret = submit_bio_wait(sb->bio);
 609         if (ret) {
 610                 prt_printf(err, "IO error: %i", ret);
 611                 return ret;
 612         }
 613
 614         if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
 615             !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
 616                 prt_printf(err, "Not a bcachefs superblock");
 617                 return -BCH_ERR_invalid_sb_magic;
 618         }
 619
 620         ret = bch2_sb_compatible(sb->sb, err);
 621         if (ret)
 622                 return ret;
 623
 624         bytes = vstruct_bytes(sb->sb);
 625
 626         if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
 627                 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
 628                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
 629                 return -BCH_ERR_invalid_sb_too_big;
 630         }
 631
 632         if (bytes > sb->buffer_size) {
 633                 ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
 634                 if (ret)
 635                         return ret;
 636                 goto reread;
 637         }
 638
 639         if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
 640                 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
 641                 return -BCH_ERR_invalid_sb_csum_type;
 642         }
 643
 644         /* XXX: verify MACs */
 645         csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
 646                             null_nonce(), sb->sb);
 647
 648         if (bch2_crc_cmp(csum, sb->sb->csum)) {
 649                 prt_printf(err, "bad checksum");
 650                 return -BCH_ERR_invalid_sb_csum;
 651         }
 652
 653         sb->seq = le64_to_cpu(sb->sb->seq);
 654
 655         return 0;
 656 }
 657
 658 int bch2_read_super(const char *path, struct bch_opts *opts,
 659                     struct bch_sb_handle *sb)
 660 {
 661         u64 offset = opt_get(*opts, sb);
 662         struct bch_sb_layout layout;
 663         struct printbuf err = PRINTBUF;
 664         __le64 *i;
 665         int ret;
 666 #ifndef __KERNEL__
 667 retry:
 668 #endif
 669         memset(sb, 0, sizeof(*sb));
 670         sb->mode        = BLK_OPEN_READ;
 671         sb->have_bio    = true;
 672         sb->holder      = kmalloc(1, GFP_KERNEL);
 673         if (!sb->holder)
 674                 return -ENOMEM;
 675
 676 #ifndef __KERNEL__
 677         if (opt_get(*opts, direct_io) == false)
 678                 sb->mode |= BLK_OPEN_BUFFERED;
 679 #endif
 680
 681         if (!opt_get(*opts, noexcl))
 682                 sb->mode |= BLK_OPEN_EXCL;
 683
 684         if (!opt_get(*opts, nochanges))
 685                 sb->mode |= BLK_OPEN_WRITE;
 686
 687         sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 688         if (IS_ERR(sb->bdev) &&
 689             PTR_ERR(sb->bdev) == -EACCES &&
 690             opt_get(*opts, read_only)) {
 691                 sb->mode &= ~BLK_OPEN_WRITE;
 692
 693                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 694                 if (!IS_ERR(sb->bdev))
 695                         opt_set(*opts, nochanges, true);
 696         }
 697
 698         if (IS_ERR(sb->bdev)) {
 699                 ret = PTR_ERR(sb->bdev);
 700                 goto out;
 701         }
 702
 703         ret = bch2_sb_realloc(sb, 0);
 704         if (ret) {
 705                 prt_printf(&err, "error allocating memory for superblock");
 706                 goto err;
 707         }
 708
 709         if (bch2_fs_init_fault("read_super")) {
 710                 prt_printf(&err, "dynamic fault");
 711                 ret = -EFAULT;
 712                 goto err;
 713         }
 714
 715         ret = read_one_super(sb, offset, &err);
 716         if (!ret)
 717                 goto got_super;
 718
 719         if (opt_defined(*opts, sb))
 720                 goto err;
 721
 722         printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s",
 723                path, err.buf);
 724         printbuf_reset(&err);
 725
 726         /*
 727          * Error reading primary superblock - read location of backup
 728          * superblocks:
 729          */
 730         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 731         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
 732         /*
 733          * use sb buffer to read layout, since sb buffer is page aligned but
 734          * layout won't be:
 735          */
 736         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
 737
 738         ret = submit_bio_wait(sb->bio);
 739         if (ret) {
 740                 prt_printf(&err, "IO error: %i", ret);
 741                 goto err;
 742         }
 743
 744         memcpy(&layout, sb->sb, sizeof(layout));
 745         ret = validate_sb_layout(&layout, &err);
 746         if (ret)
 747                 goto err;
 748
 749         for (i = layout.sb_offset;
 750              i < layout.sb_offset + layout.nr_superblocks; i++) {
 751                 offset = le64_to_cpu(*i);
 752
 753                 if (offset == opt_get(*opts, sb))
 754                         continue;
 755
 756                 ret = read_one_super(sb, offset, &err);
 757                 if (!ret)
 758                         goto got_super;
 759         }
 760
 761         goto err;
 762
 763 got_super:
 764         if (le16_to_cpu(sb->sb->block_size) << 9 <
 765             bdev_logical_block_size(sb->bdev) &&
 766             opt_get(*opts, direct_io)) {
 767 #ifndef __KERNEL__
 768                 opt_set(*opts, direct_io, false);
 769                 bch2_free_super(sb);
 770                 goto retry;
 771 #endif
 772                 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
 773                        le16_to_cpu(sb->sb->block_size) << 9,
 774                        bdev_logical_block_size(sb->bdev));
 775                 ret = -BCH_ERR_block_size_too_small;
 776                 goto err;
 777         }
 778
 779         ret = 0;
 780         sb->have_layout = true;
 781
 782         ret = bch2_sb_validate(sb, &err, READ);
 783         if (ret) {
 784                 printk(KERN_ERR "bcachefs (%s): error validating superblock: %s",
 785                        path, err.buf);
 786                 goto err_no_print;
 787         }
 788 out:
 789         printbuf_exit(&err);
 790         return ret;
 791 err:
 792         printk(KERN_ERR "bcachefs (%s): error reading superblock: %s",
 793                path, err.buf);
 794 err_no_print:
 795         bch2_free_super(sb);
 796         goto out;
 797 }
 798
 799 /* write superblock: */
 800
 801 static void write_super_endio(struct bio *bio)
 802 {
 803         struct bch_dev *ca = bio->bi_private;
 804
 805         /* XXX: return errors directly */
 806
 807         if (bch2_dev_io_err_on(bio->bi_status, ca, "superblock write error: %s",
 808                                bch2_blk_status_to_str(bio->bi_status)))
 809                 ca->sb_write_error = 1;
 810
 811         closure_put(&ca->fs->sb_write);
 812         percpu_ref_put(&ca->io_ref);
 813 }
 814
 815 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
 816 {
 817         struct bch_sb *sb = ca->disk_sb.sb;
 818         struct bio *bio = ca->disk_sb.bio;
 819
 820         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 821         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
 822         bio->bi_end_io          = write_super_endio;
 823         bio->bi_private         = ca;
 824         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
 825
 826         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
 827                      bio_sectors(bio));
 828
 829         percpu_ref_get(&ca->io_ref);
 830         closure_bio_submit(bio, &c->sb_write);
 831 }
 832
 833 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
 834 {
 835         struct bch_sb *sb = ca->disk_sb.sb;
 836         struct bio *bio = ca->disk_sb.bio;
 837
 838         sb->offset = sb->layout.sb_offset[idx];
 839
 840         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
 841         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
 842                                 null_nonce(), sb);
 843
 844         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
 845         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
 846         bio->bi_end_io          = write_super_endio;
 847         bio->bi_private         = ca;
 848         bch2_bio_map(bio, sb,
 849                      roundup((size_t) vstruct_bytes(sb),
 850                              bdev_logical_block_size(ca->disk_sb.bdev)));
 851
 852         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
 853                      bio_sectors(bio));
 854
 855         percpu_ref_get(&ca->io_ref);
 856         closure_bio_submit(bio, &c->sb_write);
 857 }
 858
 859 int bch2_write_super(struct bch_fs *c)
 860 {
 861         struct closure *cl = &c->sb_write;
 862         struct bch_dev *ca;
 863         struct printbuf err = PRINTBUF;
 864         unsigned i, sb = 0, nr_wrote;
 865         struct bch_devs_mask sb_written;
 866         bool wrote, can_mount_without_written, can_mount_with_written;
 867         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
 868         int ret = 0;
 869
 870         trace_and_count(c, write_super, c, _RET_IP_);
 871
 872         if (c->opts.very_degraded)
 873                 degraded_flags |= BCH_FORCE_IF_LOST;
 874
 875         lockdep_assert_held(&c->sb_lock);
 876
 877         closure_init_stack(cl);
 878         memset(&sb_written, 0, sizeof(sb_written));
 879
 880         /* Make sure we're using the new magic numbers: */
 881         c->disk_sb.sb->magic = BCHFS_MAGIC;
 882         c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
 883
 884         le64_add_cpu(&c->disk_sb.sb->seq, 1);
 885
 886         if (test_bit(BCH_FS_ERROR, &c->flags))
 887                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
 888         if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags))
 889                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 890
 891         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 892
 893         bch2_sb_counters_from_cpu(c);
 894
 895         for_each_online_member(ca, c, i)
 896                 bch2_sb_from_fs(c, ca);
 897
 898         for_each_online_member(ca, c, i) {
 899                 printbuf_reset(&err);
 900
 901                 ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE);
 902                 if (ret) {
 903                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
 904                         percpu_ref_put(&ca->io_ref);
 905                         goto out;
 906                 }
 907         }
 908
 909         if (c->opts.nochanges)
 910                 goto out;
 911
 912         /*
 913          * Defer writing the superblock until filesystem initialization is
 914          * complete - don't write out a partly initialized superblock:
 915          */
 916         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
 917                 goto out;
 918
 919         for_each_online_member(ca, c, i) {
 920                 __set_bit(ca->dev_idx, sb_written.d);
 921                 ca->sb_write_error = 0;
 922         }
 923
 924         for_each_online_member(ca, c, i)
 925                 read_back_super(c, ca);
 926         closure_sync(cl);
 927
 928         for_each_online_member(ca, c, i) {
 929                 if (ca->sb_write_error)
 930                         continue;
 931
 932                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
 933                         bch2_fs_fatal_error(c,
 934                                 "Superblock write was silently dropped! (seq %llu expected %llu)",
 935                                 le64_to_cpu(ca->sb_read_scratch->seq),
 936                                 ca->disk_sb.seq);
 937                         percpu_ref_put(&ca->io_ref);
 938                         ret = -BCH_ERR_erofs_sb_err;
 939                         goto out;
 940                 }
 941
 942                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
 943                         bch2_fs_fatal_error(c,
 944                                 "Superblock modified by another process (seq %llu expected %llu)",
 945                                 le64_to_cpu(ca->sb_read_scratch->seq),
 946                                 ca->disk_sb.seq);
 947                         percpu_ref_put(&ca->io_ref);
 948                         ret = -BCH_ERR_erofs_sb_err;
 949                         goto out;
 950                 }
 951         }
 952
 953         do {
 954                 wrote = false;
 955                 for_each_online_member(ca, c, i)
 956                         if (!ca->sb_write_error &&
 957                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
 958                                 write_one_super(c, ca, sb);
 959                                 wrote = true;
 960                         }
 961                 closure_sync(cl);
 962                 sb++;
 963         } while (wrote);
 964
 965         for_each_online_member(ca, c, i) {
 966                 if (ca->sb_write_error)
 967                         __clear_bit(ca->dev_idx, sb_written.d);
 968                 else
 969                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
 970         }
 971
 972         nr_wrote = dev_mask_nr(&sb_written);
 973
 974         can_mount_with_written =
 975                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 976
 977         for (i = 0; i < ARRAY_SIZE(sb_written.d); i++)
 978                 sb_written.d[i] = ~sb_written.d[i];
 979
 980         can_mount_without_written =
 981                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 982
 983         /*
 984          * If we would be able to mount _without_ the devices we successfully
 985          * wrote superblocks to, we weren't able to write to enough devices:
 986          *
 987          * Exception: if we can mount without the successes because we haven't
 988          * written anything (new filesystem), we continue if we'd be able to
 989          * mount with the devices we did successfully write to:
 990          */
 991         if (bch2_fs_fatal_err_on(!nr_wrote ||
 992                                  !can_mount_with_written ||
 993                                  (can_mount_without_written &&
 994                                   !can_mount_with_written), c,
 995                 "Unable to write superblock to sufficient devices (from %ps)",
 996                 (void *) _RET_IP_))
 997                 ret = -1;
 998 out:
 999         /* Make new options visible after they're persistent: */
1000         bch2_sb_update(c);
1001         printbuf_exit(&err);
1002         return ret;
1003 }
1004
1005 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
1006 {
1007         mutex_lock(&c->sb_lock);
1008         if (!(c->sb.features & (1ULL << feat))) {
1009                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
1010
1011                 bch2_write_super(c);
1012         }
1013         mutex_unlock(&c->sb_lock);
1014 }
1015
1016 /* Downgrade if superblock is at a higher version than currently supported: */
1017 void bch2_sb_maybe_downgrade(struct bch_fs *c)
1018 {
1019         lockdep_assert_held(&c->sb_lock);
1020
1021         /*
1022          * Downgrade, if superblock is at a higher version than currently
1023          * supported:
1024          */
1025         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
1026                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1027         if (c->sb.version > bcachefs_metadata_version_current)
1028                 c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
1029         if (c->sb.version_min > bcachefs_metadata_version_current)
1030                 c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
1031         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1032 }
1033
1034 void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
1035 {
1036         lockdep_assert_held(&c->sb_lock);
1037
1038         c->disk_sb.sb->version = cpu_to_le16(new_version);
1039         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
1040 }
1041
1042 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1043 #define x(f, nr)                                        \
1044         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1045         BCH_SB_FIELDS()
1046 #undef x
1047 };
1048
1049 static const struct bch_sb_field_ops bch2_sb_field_null_ops;
1050
1051 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
1052 {
1053         return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
1054                 ? bch2_sb_field_ops[type]
1055                 : &bch2_sb_field_null_ops;
1056 }
1057
1058 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1059                                   struct printbuf *err)
1060 {
1061         unsigned type = le32_to_cpu(f->type);
1062         struct printbuf field_err = PRINTBUF;
1063         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1064         int ret;
1065
1066         ret = ops->validate ? ops->validate(sb, f, &field_err) : 0;
1067         if (ret) {
1068                 prt_printf(err, "Invalid superblock section %s: %s",
1069                            bch2_sb_fields[type], field_err.buf);
1070                 prt_newline(err);
1071                 bch2_sb_field_to_text(err, sb, f);
1072         }
1073
1074         printbuf_exit(&field_err);
1075         return ret;
1076 }
1077
1078 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1079                            struct bch_sb_field *f)
1080 {
1081         unsigned type = le32_to_cpu(f->type);
1082         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1083
1084         if (!out->nr_tabstops)
1085                 printbuf_tabstop_push(out, 32);
1086
1087         if (type < BCH_SB_FIELD_NR)
1088                 prt_printf(out, "%s", bch2_sb_fields[type]);
1089         else
1090                 prt_printf(out, "(unknown field %u)", type);
1091
1092         prt_printf(out, " (size %zu):", vstruct_bytes(f));
1093         prt_newline(out);
1094
1095         if (ops->to_text) {
1096                 printbuf_indent_add(out, 2);
1097                 ops->to_text(out, sb, f);
1098                 printbuf_indent_sub(out, 2);
1099         }
1100 }
1101
1102 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1103 {
1104         unsigned i;
1105
1106         prt_printf(out, "Type:                    %u", l->layout_type);
1107         prt_newline(out);
1108
1109         prt_str(out, "Superblock max size:     ");
1110         prt_units_u64(out, 512 << l->sb_max_size_bits);
1111         prt_newline(out);
1112
1113         prt_printf(out, "Nr superblocks:          %u", l->nr_superblocks);
1114         prt_newline(out);
1115
1116         prt_str(out, "Offsets:                 ");
1117         for (i = 0; i < l->nr_superblocks; i++) {
1118                 if (i)
1119                         prt_str(out, ", ");
1120                 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1121         }
1122         prt_newline(out);
1123 }
1124
1125 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1126                      bool print_layout, unsigned fields)
1127 {
1128         struct bch_sb_field_members *mi;
1129         struct bch_sb_field *f;
1130         u64 fields_have = 0;
1131         unsigned nr_devices = 0;
1132
1133         if (!out->nr_tabstops)
1134                 printbuf_tabstop_push(out, 44);
1135
1136         mi = bch2_sb_get_members(sb);
1137         if (mi) {
1138                 struct bch_member *m;
1139
1140                 for (m = mi->members;
1141                      m < mi->members + sb->nr_devices;
1142                      m++)
1143                         nr_devices += bch2_member_exists(m);
1144         }
1145
1146         prt_printf(out, "External UUID:");
1147         prt_tab(out);
1148         pr_uuid(out, sb->user_uuid.b);
1149         prt_newline(out);
1150
1151         prt_printf(out, "Internal UUID:");
1152         prt_tab(out);
1153         pr_uuid(out, sb->uuid.b);
1154         prt_newline(out);
1155
1156         prt_str(out, "Device index:");
1157         prt_tab(out);
1158         prt_printf(out, "%u", sb->dev_idx);
1159         prt_newline(out);
1160
1161         prt_str(out, "Label:");
1162         prt_tab(out);
1163         prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1164         prt_newline(out);
1165
1166         prt_str(out, "Version:");
1167         prt_tab(out);
1168         bch2_version_to_text(out, le16_to_cpu(sb->version));
1169         prt_newline(out);
1170
1171         prt_str(out, "Version upgrade complete:");
1172         prt_tab(out);
1173         bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
1174         prt_newline(out);
1175
1176         prt_printf(out, "Oldest version on disk:");
1177         prt_tab(out);
1178         bch2_version_to_text(out, le16_to_cpu(sb->version_min));
1179         prt_newline(out);
1180
1181         prt_printf(out, "Created:");
1182         prt_tab(out);
1183         if (sb->time_base_lo)
1184                 pr_time(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1185         else
1186                 prt_printf(out, "(not set)");
1187         prt_newline(out);
1188
1189         prt_printf(out, "Sequence number:");
1190         prt_tab(out);
1191         prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1192         prt_newline(out);
1193
1194         prt_printf(out, "Superblock size:");
1195         prt_tab(out);
1196         prt_printf(out, "%zu", vstruct_bytes(sb));
1197         prt_newline(out);
1198
1199         prt_printf(out, "Clean:");
1200         prt_tab(out);
1201         prt_printf(out, "%llu", BCH_SB_CLEAN(sb));
1202         prt_newline(out);
1203
1204         prt_printf(out, "Devices:");
1205         prt_tab(out);
1206         prt_printf(out, "%u", nr_devices);
1207         prt_newline(out);
1208
1209         prt_printf(out, "Sections:");
1210         vstruct_for_each(sb, f)
1211                 fields_have |= 1 << le32_to_cpu(f->type);
1212         prt_tab(out);
1213         prt_bitflags(out, bch2_sb_fields, fields_have);
1214         prt_newline(out);
1215
1216         prt_printf(out, "Features:");
1217         prt_tab(out);
1218         prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1219         prt_newline(out);
1220
1221         prt_printf(out, "Compat features:");
1222         prt_tab(out);
1223         prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1224         prt_newline(out);
1225
1226         prt_newline(out);
1227         prt_printf(out, "Options:");
1228         prt_newline(out);
1229         printbuf_indent_add(out, 2);
1230         {
1231                 enum bch_opt_id id;
1232
1233                 for (id = 0; id < bch2_opts_nr; id++) {
1234                         const struct bch_option *opt = bch2_opt_table + id;
1235
1236                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1237                                 u64 v = bch2_opt_from_sb(sb, id);
1238
1239                                 prt_printf(out, "%s:", opt->attr.name);
1240                                 prt_tab(out);
1241                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1242                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1243                                 prt_newline(out);
1244                         }
1245                 }
1246         }
1247
1248         printbuf_indent_sub(out, 2);
1249
1250         if (print_layout) {
1251                 prt_newline(out);
1252                 prt_printf(out, "layout:");
1253                 prt_newline(out);
1254                 printbuf_indent_add(out, 2);
1255                 bch2_sb_layout_to_text(out, &sb->layout);
1256                 printbuf_indent_sub(out, 2);
1257         }
1258
1259         vstruct_for_each(sb, f)
1260                 if (fields & (1 << le32_to_cpu(f->type))) {
1261                         prt_newline(out);
1262                         bch2_sb_field_to_text(out, sb, f);
1263                 }
1264 }