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