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