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_id(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_id(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_id(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_id(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_id(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_v1 *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_field_get(sb, members_v1);
 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_v1)
 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_dev *ca;
 489         unsigned i;
 490
 491         lockdep_assert_held(&c->sb_lock);
 492
 493         c->sb.uuid              = src->uuid;
 494         c->sb.user_uuid         = src->user_uuid;
 495         c->sb.version           = le16_to_cpu(src->version);
 496         c->sb.version_min       = le16_to_cpu(src->version_min);
 497         c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
 498         c->sb.nr_devices        = src->nr_devices;
 499         c->sb.clean             = BCH_SB_CLEAN(src);
 500         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
 501
 502         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 503         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
 504
 505         /* XXX this is wrong, we need a 96 or 128 bit integer type */
 506         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
 507                                           c->sb.nsec_per_time_unit);
 508         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
 509
 510         c->sb.features          = le64_to_cpu(src->features[0]);
 511         c->sb.compat            = le64_to_cpu(src->compat[0]);
 512
 513         for_each_member_device(ca, c, i) {
 514                 struct bch_member m = bch2_sb_member_get(src, i);
 515                 ca->mi = bch2_mi_to_cpu(&m);
 516         }
 517 }
 518
 519 static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
 520 {
 521         struct bch_sb_field *src_f, *dst_f;
 522         struct bch_sb *dst = dst_handle->sb;
 523         unsigned i;
 524
 525         dst->version            = src->version;
 526         dst->version_min        = src->version_min;
 527         dst->seq                = src->seq;
 528         dst->uuid               = src->uuid;
 529         dst->user_uuid          = src->user_uuid;
 530         memcpy(dst->label,      src->label, sizeof(dst->label));
 531
 532         dst->block_size         = src->block_size;
 533         dst->nr_devices         = src->nr_devices;
 534
 535         dst->time_base_lo       = src->time_base_lo;
 536         dst->time_base_hi       = src->time_base_hi;
 537         dst->time_precision     = src->time_precision;
 538
 539         memcpy(dst->flags,      src->flags,     sizeof(dst->flags));
 540         memcpy(dst->features,   src->features,  sizeof(dst->features));
 541         memcpy(dst->compat,     src->compat,    sizeof(dst->compat));
 542
 543         for (i = 0; i < BCH_SB_FIELD_NR; i++) {
 544                 int d;
 545
 546                 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
 547                         continue;
 548
 549                 src_f = bch2_sb_field_get_id(src, i);
 550                 dst_f = bch2_sb_field_get_id(dst, i);
 551
 552                 d = (src_f ? le32_to_cpu(src_f->u64s) : 0) -
 553                     (dst_f ? le32_to_cpu(dst_f->u64s) : 0);
 554                 if (d > 0) {
 555                         int ret = bch2_sb_realloc(dst_handle,
 556                                         le32_to_cpu(dst_handle->sb->u64s) + d);
 557
 558                         if (ret)
 559                                 return ret;
 560
 561                         dst = dst_handle->sb;
 562                         dst_f = bch2_sb_field_get_id(dst, i);
 563                 }
 564
 565                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
 566                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
 567
 568                 if (src_f)
 569                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
 570         }
 571
 572         return 0;
 573 }
 574
 575 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
 576 {
 577         int ret;
 578
 579         lockdep_assert_held(&c->sb_lock);
 580
 581         ret =   bch2_sb_realloc(&c->disk_sb, 0) ?:
 582                 __copy_super(&c->disk_sb, src) ?:
 583                 bch2_sb_replicas_to_cpu_replicas(c) ?:
 584                 bch2_sb_disk_groups_to_cpu(c);
 585         if (ret)
 586                 return ret;
 587
 588         bch2_sb_update(c);
 589         return 0;
 590 }
 591
 592 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
 593 {
 594         return __copy_super(&ca->disk_sb, c->disk_sb.sb);
 595 }
 596
 597 /* read superblock: */
 598
 599 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
 600 {
 601         struct bch_csum csum;
 602         size_t bytes;
 603         int ret;
 604 reread:
 605         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 606         sb->bio->bi_iter.bi_sector = offset;
 607         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
 608
 609         ret = submit_bio_wait(sb->bio);
 610         if (ret) {
 611                 prt_printf(err, "IO error: %i", ret);
 612                 return ret;
 613         }
 614
 615         if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
 616             !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
 617                 prt_printf(err, "Not a bcachefs superblock");
 618                 return -BCH_ERR_invalid_sb_magic;
 619         }
 620
 621         ret = bch2_sb_compatible(sb->sb, err);
 622         if (ret)
 623                 return ret;
 624
 625         bytes = vstruct_bytes(sb->sb);
 626
 627         if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
 628                 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
 629                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
 630                 return -BCH_ERR_invalid_sb_too_big;
 631         }
 632
 633         if (bytes > sb->buffer_size) {
 634                 ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
 635                 if (ret)
 636                         return ret;
 637                 goto reread;
 638         }
 639
 640         if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
 641                 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
 642                 return -BCH_ERR_invalid_sb_csum_type;
 643         }
 644
 645         /* XXX: verify MACs */
 646         csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
 647                             null_nonce(), sb->sb);
 648
 649         if (bch2_crc_cmp(csum, sb->sb->csum)) {
 650                 prt_printf(err, "bad checksum");
 651                 return -BCH_ERR_invalid_sb_csum;
 652         }
 653
 654         sb->seq = le64_to_cpu(sb->sb->seq);
 655
 656         return 0;
 657 }
 658
 659 int bch2_read_super(const char *path, struct bch_opts *opts,
 660                     struct bch_sb_handle *sb)
 661 {
 662         u64 offset = opt_get(*opts, sb);
 663         struct bch_sb_layout layout;
 664         struct printbuf err = PRINTBUF;
 665         __le64 *i;
 666         int ret;
 667 #ifndef __KERNEL__
 668 retry:
 669 #endif
 670         memset(sb, 0, sizeof(*sb));
 671         sb->mode        = BLK_OPEN_READ;
 672         sb->have_bio    = true;
 673         sb->holder      = kmalloc(1, GFP_KERNEL);
 674         if (!sb->holder)
 675                 return -ENOMEM;
 676
 677 #ifndef __KERNEL__
 678         if (opt_get(*opts, direct_io) == false)
 679                 sb->mode |= BLK_OPEN_BUFFERED;
 680 #endif
 681
 682         if (!opt_get(*opts, noexcl))
 683                 sb->mode |= BLK_OPEN_EXCL;
 684
 685         if (!opt_get(*opts, nochanges))
 686                 sb->mode |= BLK_OPEN_WRITE;
 687
 688         sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 689         if (IS_ERR(sb->bdev) &&
 690             PTR_ERR(sb->bdev) == -EACCES &&
 691             opt_get(*opts, read_only)) {
 692                 sb->mode &= ~BLK_OPEN_WRITE;
 693
 694                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 695                 if (!IS_ERR(sb->bdev))
 696                         opt_set(*opts, nochanges, true);
 697         }
 698
 699         if (IS_ERR(sb->bdev)) {
 700                 ret = PTR_ERR(sb->bdev);
 701                 goto out;
 702         }
 703
 704         ret = bch2_sb_realloc(sb, 0);
 705         if (ret) {
 706                 prt_printf(&err, "error allocating memory for superblock");
 707                 goto err;
 708         }
 709
 710         if (bch2_fs_init_fault("read_super")) {
 711                 prt_printf(&err, "dynamic fault");
 712                 ret = -EFAULT;
 713                 goto err;
 714         }
 715
 716         ret = read_one_super(sb, offset, &err);
 717         if (!ret)
 718                 goto got_super;
 719
 720         if (opt_defined(*opts, sb))
 721                 goto err;
 722
 723         printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s",
 724                path, err.buf);
 725         printbuf_reset(&err);
 726
 727         /*
 728          * Error reading primary superblock - read location of backup
 729          * superblocks:
 730          */
 731         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 732         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
 733         /*
 734          * use sb buffer to read layout, since sb buffer is page aligned but
 735          * layout won't be:
 736          */
 737         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
 738
 739         ret = submit_bio_wait(sb->bio);
 740         if (ret) {
 741                 prt_printf(&err, "IO error: %i", ret);
 742                 goto err;
 743         }
 744
 745         memcpy(&layout, sb->sb, sizeof(layout));
 746         ret = validate_sb_layout(&layout, &err);
 747         if (ret)
 748                 goto err;
 749
 750         for (i = layout.sb_offset;
 751              i < layout.sb_offset + layout.nr_superblocks; i++) {
 752                 offset = le64_to_cpu(*i);
 753
 754                 if (offset == opt_get(*opts, sb))
 755                         continue;
 756
 757                 ret = read_one_super(sb, offset, &err);
 758                 if (!ret)
 759                         goto got_super;
 760         }
 761
 762         goto err;
 763
 764 got_super:
 765         if (le16_to_cpu(sb->sb->block_size) << 9 <
 766             bdev_logical_block_size(sb->bdev) &&
 767             opt_get(*opts, direct_io)) {
 768 #ifndef __KERNEL__
 769                 opt_set(*opts, direct_io, false);
 770                 bch2_free_super(sb);
 771                 goto retry;
 772 #endif
 773                 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
 774                        le16_to_cpu(sb->sb->block_size) << 9,
 775                        bdev_logical_block_size(sb->bdev));
 776                 ret = -BCH_ERR_block_size_too_small;
 777                 goto err;
 778         }
 779
 780         ret = 0;
 781         sb->have_layout = true;
 782
 783         ret = bch2_sb_validate(sb, &err, READ);
 784         if (ret) {
 785                 printk(KERN_ERR "bcachefs (%s): error validating superblock: %s",
 786                        path, err.buf);
 787                 goto err_no_print;
 788         }
 789 out:
 790         printbuf_exit(&err);
 791         return ret;
 792 err:
 793         printk(KERN_ERR "bcachefs (%s): error reading superblock: %s",
 794                path, err.buf);
 795 err_no_print:
 796         bch2_free_super(sb);
 797         goto out;
 798 }
 799
 800 /* write superblock: */
 801
 802 static void write_super_endio(struct bio *bio)
 803 {
 804         struct bch_dev *ca = bio->bi_private;
 805
 806         /* XXX: return errors directly */
 807
 808         if (bch2_dev_io_err_on(bio->bi_status, ca, "superblock write error: %s",
 809                                bch2_blk_status_to_str(bio->bi_status)))
 810                 ca->sb_write_error = 1;
 811
 812         closure_put(&ca->fs->sb_write);
 813         percpu_ref_put(&ca->io_ref);
 814 }
 815
 816 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
 817 {
 818         struct bch_sb *sb = ca->disk_sb.sb;
 819         struct bio *bio = ca->disk_sb.bio;
 820
 821         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 822         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
 823         bio->bi_end_io          = write_super_endio;
 824         bio->bi_private         = ca;
 825         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
 826
 827         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
 828                      bio_sectors(bio));
 829
 830         percpu_ref_get(&ca->io_ref);
 831         closure_bio_submit(bio, &c->sb_write);
 832 }
 833
 834 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
 835 {
 836         struct bch_sb *sb = ca->disk_sb.sb;
 837         struct bio *bio = ca->disk_sb.bio;
 838
 839         sb->offset = sb->layout.sb_offset[idx];
 840
 841         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
 842         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
 843                                 null_nonce(), sb);
 844
 845         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
 846         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
 847         bio->bi_end_io          = write_super_endio;
 848         bio->bi_private         = ca;
 849         bch2_bio_map(bio, sb,
 850                      roundup((size_t) vstruct_bytes(sb),
 851                              bdev_logical_block_size(ca->disk_sb.bdev)));
 852
 853         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
 854                      bio_sectors(bio));
 855
 856         percpu_ref_get(&ca->io_ref);
 857         closure_bio_submit(bio, &c->sb_write);
 858 }
 859
 860 int bch2_write_super(struct bch_fs *c)
 861 {
 862         struct closure *cl = &c->sb_write;
 863         struct bch_dev *ca;
 864         struct printbuf err = PRINTBUF;
 865         unsigned i, sb = 0, nr_wrote;
 866         struct bch_devs_mask sb_written;
 867         bool wrote, can_mount_without_written, can_mount_with_written;
 868         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
 869         int ret = 0;
 870
 871         trace_and_count(c, write_super, c, _RET_IP_);
 872
 873         if (c->opts.very_degraded)
 874                 degraded_flags |= BCH_FORCE_IF_LOST;
 875
 876         lockdep_assert_held(&c->sb_lock);
 877
 878         closure_init_stack(cl);
 879         memset(&sb_written, 0, sizeof(sb_written));
 880
 881         /* Make sure we're using the new magic numbers: */
 882         c->disk_sb.sb->magic = BCHFS_MAGIC;
 883         c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
 884
 885         le64_add_cpu(&c->disk_sb.sb->seq, 1);
 886
 887         if (test_bit(BCH_FS_ERROR, &c->flags))
 888                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
 889         if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags))
 890                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 891
 892         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 893
 894         bch2_sb_counters_from_cpu(c);
 895         bch_members_cpy_v2_v1(&c->disk_sb);
 896
 897         for_each_online_member(ca, c, i)
 898                 bch2_sb_from_fs(c, ca);
 899
 900         for_each_online_member(ca, c, i) {
 901                 printbuf_reset(&err);
 902
 903                 ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE);
 904                 if (ret) {
 905                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
 906                         percpu_ref_put(&ca->io_ref);
 907                         goto out;
 908                 }
 909         }
 910
 911         if (c->opts.nochanges)
 912                 goto out;
 913
 914         /*
 915          * Defer writing the superblock until filesystem initialization is
 916          * complete - don't write out a partly initialized superblock:
 917          */
 918         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
 919                 goto out;
 920
 921         for_each_online_member(ca, c, i) {
 922                 __set_bit(ca->dev_idx, sb_written.d);
 923                 ca->sb_write_error = 0;
 924         }
 925
 926         for_each_online_member(ca, c, i)
 927                 read_back_super(c, ca);
 928         closure_sync(cl);
 929
 930         for_each_online_member(ca, c, i) {
 931                 if (ca->sb_write_error)
 932                         continue;
 933
 934                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
 935                         bch2_fs_fatal_error(c,
 936                                 "Superblock write was silently dropped! (seq %llu expected %llu)",
 937                                 le64_to_cpu(ca->sb_read_scratch->seq),
 938                                 ca->disk_sb.seq);
 939                         percpu_ref_put(&ca->io_ref);
 940                         ret = -BCH_ERR_erofs_sb_err;
 941                         goto out;
 942                 }
 943
 944                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
 945                         bch2_fs_fatal_error(c,
 946                                 "Superblock modified by another process (seq %llu expected %llu)",
 947                                 le64_to_cpu(ca->sb_read_scratch->seq),
 948                                 ca->disk_sb.seq);
 949                         percpu_ref_put(&ca->io_ref);
 950                         ret = -BCH_ERR_erofs_sb_err;
 951                         goto out;
 952                 }
 953         }
 954
 955         do {
 956                 wrote = false;
 957                 for_each_online_member(ca, c, i)
 958                         if (!ca->sb_write_error &&
 959                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
 960                                 write_one_super(c, ca, sb);
 961                                 wrote = true;
 962                         }
 963                 closure_sync(cl);
 964                 sb++;
 965         } while (wrote);
 966
 967         for_each_online_member(ca, c, i) {
 968                 if (ca->sb_write_error)
 969                         __clear_bit(ca->dev_idx, sb_written.d);
 970                 else
 971                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
 972         }
 973
 974         nr_wrote = dev_mask_nr(&sb_written);
 975
 976         can_mount_with_written =
 977                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 978
 979         for (i = 0; i < ARRAY_SIZE(sb_written.d); i++)
 980                 sb_written.d[i] = ~sb_written.d[i];
 981
 982         can_mount_without_written =
 983                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 984
 985         /*
 986          * If we would be able to mount _without_ the devices we successfully
 987          * wrote superblocks to, we weren't able to write to enough devices:
 988          *
 989          * Exception: if we can mount without the successes because we haven't
 990          * written anything (new filesystem), we continue if we'd be able to
 991          * mount with the devices we did successfully write to:
 992          */
 993         if (bch2_fs_fatal_err_on(!nr_wrote ||
 994                                  !can_mount_with_written ||
 995                                  (can_mount_without_written &&
 996                                   !can_mount_with_written), c,
 997                 "Unable to write superblock to sufficient devices (from %ps)",
 998                 (void *) _RET_IP_))
 999                 ret = -1;
1000 out:
1001         /* Make new options visible after they're persistent: */
1002         bch2_sb_update(c);
1003         printbuf_exit(&err);
1004         return ret;
1005 }
1006
1007 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
1008 {
1009         mutex_lock(&c->sb_lock);
1010         if (!(c->sb.features & (1ULL << feat))) {
1011                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
1012
1013                 bch2_write_super(c);
1014         }
1015         mutex_unlock(&c->sb_lock);
1016 }
1017
1018 /* Downgrade if superblock is at a higher version than currently supported: */
1019 void bch2_sb_maybe_downgrade(struct bch_fs *c)
1020 {
1021         lockdep_assert_held(&c->sb_lock);
1022
1023         /*
1024          * Downgrade, if superblock is at a higher version than currently
1025          * supported:
1026          */
1027         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
1028                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1029         if (c->sb.version > bcachefs_metadata_version_current)
1030                 c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
1031         if (c->sb.version_min > bcachefs_metadata_version_current)
1032                 c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
1033         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1034 }
1035
1036 void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
1037 {
1038         lockdep_assert_held(&c->sb_lock);
1039
1040         c->disk_sb.sb->version = cpu_to_le16(new_version);
1041         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
1042 }
1043
1044 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1045 #define x(f, nr)                                        \
1046         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1047         BCH_SB_FIELDS()
1048 #undef x
1049 };
1050
1051 static const struct bch_sb_field_ops bch2_sb_field_null_ops;
1052
1053 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
1054 {
1055         return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
1056                 ? bch2_sb_field_ops[type]
1057                 : &bch2_sb_field_null_ops;
1058 }
1059
1060 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1061                                   struct printbuf *err)
1062 {
1063         unsigned type = le32_to_cpu(f->type);
1064         struct printbuf field_err = PRINTBUF;
1065         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1066         int ret;
1067
1068         ret = ops->validate ? ops->validate(sb, f, &field_err) : 0;
1069         if (ret) {
1070                 prt_printf(err, "Invalid superblock section %s: %s",
1071                            bch2_sb_fields[type], field_err.buf);
1072                 prt_newline(err);
1073                 bch2_sb_field_to_text(err, sb, f);
1074         }
1075
1076         printbuf_exit(&field_err);
1077         return ret;
1078 }
1079
1080 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1081                            struct bch_sb_field *f)
1082 {
1083         unsigned type = le32_to_cpu(f->type);
1084         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1085
1086         if (!out->nr_tabstops)
1087                 printbuf_tabstop_push(out, 32);
1088
1089         if (type < BCH_SB_FIELD_NR)
1090                 prt_printf(out, "%s", bch2_sb_fields[type]);
1091         else
1092                 prt_printf(out, "(unknown field %u)", type);
1093
1094         prt_printf(out, " (size %zu):", vstruct_bytes(f));
1095         prt_newline(out);
1096
1097         if (ops->to_text) {
1098                 printbuf_indent_add(out, 2);
1099                 ops->to_text(out, sb, f);
1100                 printbuf_indent_sub(out, 2);
1101         }
1102 }
1103
1104 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1105 {
1106         unsigned i;
1107
1108         prt_printf(out, "Type:                    %u", l->layout_type);
1109         prt_newline(out);
1110
1111         prt_str(out, "Superblock max size:     ");
1112         prt_units_u64(out, 512 << l->sb_max_size_bits);
1113         prt_newline(out);
1114
1115         prt_printf(out, "Nr superblocks:          %u", l->nr_superblocks);
1116         prt_newline(out);
1117
1118         prt_str(out, "Offsets:                 ");
1119         for (i = 0; i < l->nr_superblocks; i++) {
1120                 if (i)
1121                         prt_str(out, ", ");
1122                 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1123         }
1124         prt_newline(out);
1125 }
1126
1127 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1128                      bool print_layout, unsigned fields)
1129 {
1130         struct bch_sb_field *f;
1131         u64 fields_have = 0;
1132         unsigned nr_devices = 0;
1133
1134         if (!out->nr_tabstops)
1135                 printbuf_tabstop_push(out, 44);
1136
1137         for (int i = 0; i < sb->nr_devices; i++)
1138                 nr_devices += bch2_dev_exists(sb, i);
1139
1140         prt_printf(out, "External UUID:");
1141         prt_tab(out);
1142         pr_uuid(out, sb->user_uuid.b);
1143         prt_newline(out);
1144
1145         prt_printf(out, "Internal UUID:");
1146         prt_tab(out);
1147         pr_uuid(out, sb->uuid.b);
1148         prt_newline(out);
1149
1150         prt_str(out, "Device index:");
1151         prt_tab(out);
1152         prt_printf(out, "%u", sb->dev_idx);
1153         prt_newline(out);
1154
1155         prt_str(out, "Label:");
1156         prt_tab(out);
1157         prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1158         prt_newline(out);
1159
1160         prt_str(out, "Version:");
1161         prt_tab(out);
1162         bch2_version_to_text(out, le16_to_cpu(sb->version));
1163         prt_newline(out);
1164
1165         prt_str(out, "Version upgrade complete:");
1166         prt_tab(out);
1167         bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
1168         prt_newline(out);
1169
1170         prt_printf(out, "Oldest version on disk:");
1171         prt_tab(out);
1172         bch2_version_to_text(out, le16_to_cpu(sb->version_min));
1173         prt_newline(out);
1174
1175         prt_printf(out, "Created:");
1176         prt_tab(out);
1177         if (sb->time_base_lo)
1178                 pr_time(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1179         else
1180                 prt_printf(out, "(not set)");
1181         prt_newline(out);
1182
1183         prt_printf(out, "Sequence number:");
1184         prt_tab(out);
1185         prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1186         prt_newline(out);
1187
1188         prt_printf(out, "Superblock size:");
1189         prt_tab(out);
1190         prt_printf(out, "%zu", vstruct_bytes(sb));
1191         prt_newline(out);
1192
1193         prt_printf(out, "Clean:");
1194         prt_tab(out);
1195         prt_printf(out, "%llu", BCH_SB_CLEAN(sb));
1196         prt_newline(out);
1197
1198         prt_printf(out, "Devices:");
1199         prt_tab(out);
1200         prt_printf(out, "%u", nr_devices);
1201         prt_newline(out);
1202
1203         prt_printf(out, "Sections:");
1204         vstruct_for_each(sb, f)
1205                 fields_have |= 1 << le32_to_cpu(f->type);
1206         prt_tab(out);
1207         prt_bitflags(out, bch2_sb_fields, fields_have);
1208         prt_newline(out);
1209
1210         prt_printf(out, "Features:");
1211         prt_tab(out);
1212         prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1213         prt_newline(out);
1214
1215         prt_printf(out, "Compat features:");
1216         prt_tab(out);
1217         prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1218         prt_newline(out);
1219
1220         prt_newline(out);
1221         prt_printf(out, "Options:");
1222         prt_newline(out);
1223         printbuf_indent_add(out, 2);
1224         {
1225                 enum bch_opt_id id;
1226
1227                 for (id = 0; id < bch2_opts_nr; id++) {
1228                         const struct bch_option *opt = bch2_opt_table + id;
1229
1230                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1231                                 u64 v = bch2_opt_from_sb(sb, id);
1232
1233                                 prt_printf(out, "%s:", opt->attr.name);
1234                                 prt_tab(out);
1235                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1236                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1237                                 prt_newline(out);
1238                         }
1239                 }
1240         }
1241
1242         printbuf_indent_sub(out, 2);
1243
1244         if (print_layout) {
1245                 prt_newline(out);
1246                 prt_printf(out, "layout:");
1247                 prt_newline(out);
1248                 printbuf_indent_add(out, 2);
1249                 bch2_sb_layout_to_text(out, &sb->layout);
1250                 printbuf_indent_sub(out, 2);
1251         }
1252
1253         vstruct_for_each(sb, f)
1254                 if (fields & (1 << le32_to_cpu(f->type))) {
1255                         prt_newline(out);
1256                         bch2_sb_field_to_text(out, sb, f);
1257                 }
1258 }