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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "checksum.h"
   5 #include "counters.h"
   6 #include "disk_groups.h"
   7 #include "ec.h"
   8 #include "error.h"
   9 #include "journal.h"
  10 #include "journal_sb.h"
  11 #include "journal_seq_blacklist.h"
  12 #include "recovery.h"
  13 #include "replicas.h"
  14 #include "quota.h"
  15 #include "sb-clean.h"
  16 #include "sb-errors.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 static const struct blk_holder_ops bch2_sb_handle_bdev_ops = {
  27 };
  28
  29 struct bch2_metadata_version {
  30         u16             version;
  31         const char      *name;
  32         u64             recovery_passes;
  33 };
  34
  35 static const struct bch2_metadata_version bch2_metadata_versions[] = {
  36 #define x(n, v, _recovery_passes) {             \
  37         .version = v,                           \
  38         .name = #n,                             \
  39         .recovery_passes = _recovery_passes,    \
  40 },
  41         BCH_METADATA_VERSIONS()
  42 #undef x
  43 };
  44
  45 void bch2_version_to_text(struct printbuf *out, unsigned v)
  46 {
  47         const char *str = "(unknown version)";
  48
  49         for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
  50                 if (bch2_metadata_versions[i].version == v) {
  51                         str = bch2_metadata_versions[i].name;
  52                         break;
  53                 }
  54
  55         prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str);
  56 }
  57
  58 unsigned bch2_latest_compatible_version(unsigned v)
  59 {
  60         if (!BCH_VERSION_MAJOR(v))
  61                 return v;
  62
  63         for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
  64                 if (bch2_metadata_versions[i].version > v &&
  65                     BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) ==
  66                     BCH_VERSION_MAJOR(v))
  67                         v = bch2_metadata_versions[i].version;
  68
  69         return v;
  70 }
  71
  72 u64 bch2_upgrade_recovery_passes(struct bch_fs *c,
  73                                  unsigned old_version,
  74                                  unsigned new_version)
  75 {
  76         u64 ret = 0;
  77
  78         for (const struct bch2_metadata_version *i = bch2_metadata_versions;
  79              i < bch2_metadata_versions + ARRAY_SIZE(bch2_metadata_versions);
  80              i++)
  81                 if (i->version > old_version && i->version <= new_version) {
  82                         if (i->recovery_passes & RECOVERY_PASS_ALL_FSCK)
  83                                 ret |= bch2_fsck_recovery_passes();
  84                         ret |= i->recovery_passes;
  85                 }
  86
  87         return ret &= ~RECOVERY_PASS_ALL_FSCK;
  88 }
  89
  90 const char * const bch2_sb_fields[] = {
  91 #define x(name, nr)     #name,
  92         BCH_SB_FIELDS()
  93 #undef x
  94         NULL
  95 };
  96
  97 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
  98                                   struct printbuf *);
  99
 100 struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb,
 101                                       enum bch_sb_field_type type)
 102 {
 103         struct bch_sb_field *f;
 104
 105         /* XXX: need locking around superblock to access optional fields */
 106
 107         vstruct_for_each(sb, f)
 108                 if (le32_to_cpu(f->type) == type)
 109                         return f;
 110         return NULL;
 111 }
 112
 113 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
 114                                                    struct bch_sb_field *f,
 115                                                    unsigned u64s)
 116 {
 117         unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 118         unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
 119
 120         BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
 121
 122         if (!f && !u64s) {
 123                 /* nothing to do: */
 124         } else if (!f) {
 125                 f = vstruct_last(sb->sb);
 126                 memset(f, 0, sizeof(u64) * u64s);
 127                 f->u64s = cpu_to_le32(u64s);
 128                 f->type = 0;
 129         } else {
 130                 void *src, *dst;
 131
 132                 src = vstruct_end(f);
 133
 134                 if (u64s) {
 135                         f->u64s = cpu_to_le32(u64s);
 136                         dst = vstruct_end(f);
 137                 } else {
 138                         dst = f;
 139                 }
 140
 141                 memmove(dst, src, vstruct_end(sb->sb) - src);
 142
 143                 if (dst > src)
 144                         memset(src, 0, dst - src);
 145         }
 146
 147         sb->sb->u64s = cpu_to_le32(sb_u64s);
 148
 149         return u64s ? f : NULL;
 150 }
 151
 152 void bch2_sb_field_delete(struct bch_sb_handle *sb,
 153                           enum bch_sb_field_type type)
 154 {
 155         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 156
 157         if (f)
 158                 __bch2_sb_field_resize(sb, f, 0);
 159 }
 160
 161 /* Superblock realloc/free: */
 162
 163 void bch2_free_super(struct bch_sb_handle *sb)
 164 {
 165         kfree(sb->bio);
 166         if (!IS_ERR_OR_NULL(sb->bdev))
 167                 blkdev_put(sb->bdev, sb->holder);
 168         kfree(sb->holder);
 169
 170         kfree(sb->sb);
 171         memset(sb, 0, sizeof(*sb));
 172 }
 173
 174 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 175 {
 176         size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
 177         size_t new_buffer_size;
 178         struct bch_sb *new_sb;
 179         struct bio *bio;
 180
 181         if (sb->bdev)
 182                 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
 183
 184         new_buffer_size = roundup_pow_of_two(new_bytes);
 185
 186         if (sb->sb && sb->buffer_size >= new_buffer_size)
 187                 return 0;
 188
 189         if (sb->sb && sb->have_layout) {
 190                 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
 191
 192                 if (new_bytes > max_bytes) {
 193                         pr_err("%pg: superblock too big: want %zu but have %llu",
 194                                sb->bdev, new_bytes, max_bytes);
 195                         return -BCH_ERR_ENOSPC_sb;
 196                 }
 197         }
 198
 199         if (sb->buffer_size >= new_buffer_size && sb->sb)
 200                 return 0;
 201
 202         if (dynamic_fault("bcachefs:add:super_realloc"))
 203                 return -BCH_ERR_ENOMEM_sb_realloc_injected;
 204
 205         new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
 206         if (!new_sb)
 207                 return -BCH_ERR_ENOMEM_sb_buf_realloc;
 208
 209         sb->sb = new_sb;
 210
 211         if (sb->have_bio) {
 212                 unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size);
 213
 214                 bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
 215                 if (!bio)
 216                         return -BCH_ERR_ENOMEM_sb_bio_realloc;
 217
 218                 bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
 219
 220                 kfree(sb->bio);
 221                 sb->bio = bio;
 222         }
 223
 224         sb->buffer_size = new_buffer_size;
 225
 226         return 0;
 227 }
 228
 229 struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb,
 230                                           enum bch_sb_field_type type,
 231                                           unsigned u64s)
 232 {
 233         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 234         ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 235         ssize_t d = -old_u64s + u64s;
 236
 237         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
 238                 return NULL;
 239
 240         if (sb->fs_sb) {
 241                 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
 242                 struct bch_dev *ca;
 243                 unsigned i;
 244
 245                 lockdep_assert_held(&c->sb_lock);
 246
 247                 /* XXX: we're not checking that offline device have enough space */
 248
 249                 for_each_online_member(ca, c, i) {
 250                         struct bch_sb_handle *dev_sb = &ca->disk_sb;
 251
 252                         if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
 253                                 percpu_ref_put(&ca->ref);
 254                                 return NULL;
 255                         }
 256                 }
 257         }
 258
 259         f = bch2_sb_field_get_id(sb->sb, type);
 260         f = __bch2_sb_field_resize(sb, f, u64s);
 261         if (f)
 262                 f->type = cpu_to_le32(type);
 263         return f;
 264 }
 265
 266 /* Superblock validate: */
 267
 268 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
 269 {
 270         u64 offset, prev_offset, max_sectors;
 271         unsigned i;
 272
 273         BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
 274
 275         if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
 276             !uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
 277                 prt_printf(out, "Not a bcachefs superblock layout");
 278                 return -BCH_ERR_invalid_sb_layout;
 279         }
 280
 281         if (layout->layout_type != 0) {
 282                 prt_printf(out, "Invalid superblock layout type %u",
 283                        layout->layout_type);
 284                 return -BCH_ERR_invalid_sb_layout_type;
 285         }
 286
 287         if (!layout->nr_superblocks) {
 288                 prt_printf(out, "Invalid superblock layout: no superblocks");
 289                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 290         }
 291
 292         if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
 293                 prt_printf(out, "Invalid superblock layout: too many superblocks");
 294                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 295         }
 296
 297         max_sectors = 1 << layout->sb_max_size_bits;
 298
 299         prev_offset = le64_to_cpu(layout->sb_offset[0]);
 300
 301         for (i = 1; i < layout->nr_superblocks; i++) {
 302                 offset = le64_to_cpu(layout->sb_offset[i]);
 303
 304                 if (offset < prev_offset + max_sectors) {
 305                         prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
 306                                "  (sb %u ends at %llu next starts at %llu",
 307                                i - 1, prev_offset + max_sectors, offset);
 308                         return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
 309                 }
 310                 prev_offset = offset;
 311         }
 312
 313         return 0;
 314 }
 315
 316 static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out)
 317 {
 318         u16 version             = le16_to_cpu(sb->version);
 319         u16 version_min         = le16_to_cpu(sb->version_min);
 320
 321         if (!bch2_version_compatible(version)) {
 322                 prt_str(out, "Unsupported superblock version ");
 323                 bch2_version_to_text(out, version);
 324                 prt_str(out, " (min ");
 325                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 326                 prt_str(out, ", max ");
 327                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 328                 prt_str(out, ")");
 329                 return -BCH_ERR_invalid_sb_version;
 330         }
 331
 332         if (!bch2_version_compatible(version_min)) {
 333                 prt_str(out, "Unsupported superblock version_min ");
 334                 bch2_version_to_text(out, version_min);
 335                 prt_str(out, " (min ");
 336                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 337                 prt_str(out, ", max ");
 338                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 339                 prt_str(out, ")");
 340                 return -BCH_ERR_invalid_sb_version;
 341         }
 342
 343         if (version_min > version) {
 344                 prt_str(out, "Bad minimum version ");
 345                 bch2_version_to_text(out, version_min);
 346                 prt_str(out, ", greater than version field ");
 347                 bch2_version_to_text(out, version);
 348                 return -BCH_ERR_invalid_sb_version;
 349         }
 350
 351         return 0;
 352 }
 353
 354 static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 355                             int rw)
 356 {
 357         struct bch_sb *sb = disk_sb->sb;
 358         struct bch_sb_field *f;
 359         struct bch_sb_field_members_v1 *mi;
 360         enum bch_opt_id opt_id;
 361         u16 block_size;
 362         int ret;
 363
 364         ret = bch2_sb_compatible(sb, out);
 365         if (ret)
 366                 return ret;
 367
 368         if (sb->features[1] ||
 369             (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
 370                 prt_printf(out, "Filesystem has incompatible features");
 371                 return -BCH_ERR_invalid_sb_features;
 372         }
 373
 374         block_size = le16_to_cpu(sb->block_size);
 375
 376         if (block_size > PAGE_SECTORS) {
 377                 prt_printf(out, "Block size too big (got %u, max %u)",
 378                        block_size, PAGE_SECTORS);
 379                 return -BCH_ERR_invalid_sb_block_size;
 380         }
 381
 382         if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
 383                 prt_printf(out, "Bad user UUID (got zeroes)");
 384                 return -BCH_ERR_invalid_sb_uuid;
 385         }
 386
 387         if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
 388                 prt_printf(out, "Bad internal UUID (got zeroes)");
 389                 return -BCH_ERR_invalid_sb_uuid;
 390         }
 391
 392         if (!sb->nr_devices ||
 393             sb->nr_devices > BCH_SB_MEMBERS_MAX) {
 394                 prt_printf(out, "Bad number of member devices %u (max %u)",
 395                        sb->nr_devices, BCH_SB_MEMBERS_MAX);
 396                 return -BCH_ERR_invalid_sb_too_many_members;
 397         }
 398
 399         if (sb->dev_idx >= sb->nr_devices) {
 400                 prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
 401                        sb->dev_idx, sb->nr_devices);
 402                 return -BCH_ERR_invalid_sb_dev_idx;
 403         }
 404
 405         if (!sb->time_precision ||
 406             le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
 407                 prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
 408                        le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
 409                 return -BCH_ERR_invalid_sb_time_precision;
 410         }
 411
 412         if (rw == READ) {
 413                 /*
 414                  * Been seeing a bug where these are getting inexplicably
 415                  * zeroed, so we're now validating them, but we have to be
 416                  * careful not to preven people's filesystems from mounting:
 417                  */
 418                 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
 419                         SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 420                 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 421                         SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
 422
 423                 if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb))
 424                         SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version));
 425         }
 426
 427         for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
 428                 const struct bch_option *opt = bch2_opt_table + opt_id;
 429
 430                 if (opt->get_sb != BCH2_NO_SB_OPT) {
 431                         u64 v = bch2_opt_from_sb(sb, opt_id);
 432
 433                         prt_printf(out, "Invalid option ");
 434                         ret = bch2_opt_validate(opt, v, out);
 435                         if (ret)
 436                                 return ret;
 437
 438                         printbuf_reset(out);
 439                 }
 440         }
 441
 442         /* validate layout */
 443         ret = validate_sb_layout(&sb->layout, out);
 444         if (ret)
 445                 return ret;
 446
 447         vstruct_for_each(sb, f) {
 448                 if (!f->u64s) {
 449                         prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
 450                                le32_to_cpu(f->type));
 451                         return -BCH_ERR_invalid_sb_field_size;
 452                 }
 453
 454                 if (vstruct_next(f) > vstruct_last(sb)) {
 455                         prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
 456                                le32_to_cpu(f->type));
 457                         return -BCH_ERR_invalid_sb_field_size;
 458                 }
 459         }
 460
 461         /* members must be validated first: */
 462         mi = bch2_sb_field_get(sb, members_v1);
 463         if (!mi) {
 464                 prt_printf(out, "Invalid superblock: member info area missing");
 465                 return -BCH_ERR_invalid_sb_members_missing;
 466         }
 467
 468         ret = bch2_sb_field_validate(sb, &mi->field, out);
 469         if (ret)
 470                 return ret;
 471
 472         vstruct_for_each(sb, f) {
 473                 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1)
 474                         continue;
 475
 476                 ret = bch2_sb_field_validate(sb, f, out);
 477                 if (ret)
 478                         return ret;
 479         }
 480
 481         return 0;
 482 }
 483
 484 /* device open: */
 485
 486 static void bch2_sb_update(struct bch_fs *c)
 487 {
 488         struct bch_sb *src = c->disk_sb.sb;
 489         struct bch_dev *ca;
 490         unsigned i;
 491
 492         lockdep_assert_held(&c->sb_lock);
 493
 494         c->sb.uuid              = src->uuid;
 495         c->sb.user_uuid         = src->user_uuid;
 496         c->sb.version           = le16_to_cpu(src->version);
 497         c->sb.version_min       = le16_to_cpu(src->version_min);
 498         c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
 499         c->sb.nr_devices        = src->nr_devices;
 500         c->sb.clean             = BCH_SB_CLEAN(src);
 501         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
 502
 503         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 504         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
 505
 506         /* XXX this is wrong, we need a 96 or 128 bit integer type */
 507         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
 508                                           c->sb.nsec_per_time_unit);
 509         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
 510
 511         c->sb.features          = le64_to_cpu(src->features[0]);
 512         c->sb.compat            = le64_to_cpu(src->compat[0]);
 513
 514         for_each_member_device(ca, c, i) {
 515                 struct bch_member m = bch2_sb_member_get(src, i);
 516                 ca->mi = bch2_mi_to_cpu(&m);
 517         }
 518 }
 519
 520 static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
 521 {
 522         struct bch_sb_field *src_f, *dst_f;
 523         struct bch_sb *dst = dst_handle->sb;
 524         unsigned i;
 525
 526         dst->version            = src->version;
 527         dst->version_min        = src->version_min;
 528         dst->seq                = src->seq;
 529         dst->uuid               = src->uuid;
 530         dst->user_uuid          = src->user_uuid;
 531         memcpy(dst->label,      src->label, sizeof(dst->label));
 532
 533         dst->block_size         = src->block_size;
 534         dst->nr_devices         = src->nr_devices;
 535
 536         dst->time_base_lo       = src->time_base_lo;
 537         dst->time_base_hi       = src->time_base_hi;
 538         dst->time_precision     = src->time_precision;
 539
 540         memcpy(dst->flags,      src->flags,     sizeof(dst->flags));
 541         memcpy(dst->features,   src->features,  sizeof(dst->features));
 542         memcpy(dst->compat,     src->compat,    sizeof(dst->compat));
 543
 544         for (i = 0; i < BCH_SB_FIELD_NR; i++) {
 545                 int d;
 546
 547                 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
 548                         continue;
 549
 550                 src_f = bch2_sb_field_get_id(src, i);
 551                 dst_f = bch2_sb_field_get_id(dst, i);
 552
 553                 d = (src_f ? le32_to_cpu(src_f->u64s) : 0) -
 554                     (dst_f ? le32_to_cpu(dst_f->u64s) : 0);
 555                 if (d > 0) {
 556                         int ret = bch2_sb_realloc(dst_handle,
 557                                         le32_to_cpu(dst_handle->sb->u64s) + d);
 558
 559                         if (ret)
 560                                 return ret;
 561
 562                         dst = dst_handle->sb;
 563                         dst_f = bch2_sb_field_get_id(dst, i);
 564                 }
 565
 566                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
 567                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
 568
 569                 if (src_f)
 570                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
 571         }
 572
 573         return 0;
 574 }
 575
 576 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
 577 {
 578         int ret;
 579
 580         lockdep_assert_held(&c->sb_lock);
 581
 582         ret =   bch2_sb_realloc(&c->disk_sb, 0) ?:
 583                 __copy_super(&c->disk_sb, src) ?:
 584                 bch2_sb_replicas_to_cpu_replicas(c) ?:
 585                 bch2_sb_disk_groups_to_cpu(c);
 586         if (ret)
 587                 return ret;
 588
 589         bch2_sb_update(c);
 590         return 0;
 591 }
 592
 593 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
 594 {
 595         return __copy_super(&ca->disk_sb, c->disk_sb.sb);
 596 }
 597
 598 /* read superblock: */
 599
 600 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
 601 {
 602         struct bch_csum csum;
 603         size_t bytes;
 604         int ret;
 605 reread:
 606         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 607         sb->bio->bi_iter.bi_sector = offset;
 608         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
 609
 610         ret = submit_bio_wait(sb->bio);
 611         if (ret) {
 612                 prt_printf(err, "IO error: %i", ret);
 613                 return ret;
 614         }
 615
 616         if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
 617             !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
 618                 prt_printf(err, "Not a bcachefs superblock");
 619                 return -BCH_ERR_invalid_sb_magic;
 620         }
 621
 622         ret = bch2_sb_compatible(sb->sb, err);
 623         if (ret)
 624                 return ret;
 625
 626         bytes = vstruct_bytes(sb->sb);
 627
 628         if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
 629                 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
 630                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
 631                 return -BCH_ERR_invalid_sb_too_big;
 632         }
 633
 634         if (bytes > sb->buffer_size) {
 635                 ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
 636                 if (ret)
 637                         return ret;
 638                 goto reread;
 639         }
 640
 641         if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
 642                 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
 643                 return -BCH_ERR_invalid_sb_csum_type;
 644         }
 645
 646         /* XXX: verify MACs */
 647         csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
 648                             null_nonce(), sb->sb);
 649
 650         if (bch2_crc_cmp(csum, sb->sb->csum)) {
 651                 prt_printf(err, "bad checksum");
 652                 return -BCH_ERR_invalid_sb_csum;
 653         }
 654
 655         sb->seq = le64_to_cpu(sb->sb->seq);
 656
 657         return 0;
 658 }
 659
 660 int bch2_read_super(const char *path, struct bch_opts *opts,
 661                     struct bch_sb_handle *sb)
 662 {
 663         u64 offset = opt_get(*opts, sb);
 664         struct bch_sb_layout layout;
 665         struct printbuf err = PRINTBUF;
 666         __le64 *i;
 667         int ret;
 668 #ifndef __KERNEL__
 669 retry:
 670 #endif
 671         memset(sb, 0, sizeof(*sb));
 672         sb->mode        = BLK_OPEN_READ;
 673         sb->have_bio    = true;
 674         sb->holder      = kmalloc(1, GFP_KERNEL);
 675         if (!sb->holder)
 676                 return -ENOMEM;
 677
 678 #ifndef __KERNEL__
 679         if (opt_get(*opts, direct_io) == false)
 680                 sb->mode |= BLK_OPEN_BUFFERED;
 681 #endif
 682
 683         if (!opt_get(*opts, noexcl))
 684                 sb->mode |= BLK_OPEN_EXCL;
 685
 686         if (!opt_get(*opts, nochanges))
 687                 sb->mode |= BLK_OPEN_WRITE;
 688
 689         sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 690         if (IS_ERR(sb->bdev) &&
 691             PTR_ERR(sb->bdev) == -EACCES &&
 692             opt_get(*opts, read_only)) {
 693                 sb->mode &= ~BLK_OPEN_WRITE;
 694
 695                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 696                 if (!IS_ERR(sb->bdev))
 697                         opt_set(*opts, nochanges, true);
 698         }
 699
 700         if (IS_ERR(sb->bdev)) {
 701                 ret = PTR_ERR(sb->bdev);
 702                 goto out;
 703         }
 704
 705         ret = bch2_sb_realloc(sb, 0);
 706         if (ret) {
 707                 prt_printf(&err, "error allocating memory for superblock");
 708                 goto err;
 709         }
 710
 711         if (bch2_fs_init_fault("read_super")) {
 712                 prt_printf(&err, "dynamic fault");
 713                 ret = -EFAULT;
 714                 goto err;
 715         }
 716
 717         ret = read_one_super(sb, offset, &err);
 718         if (!ret)
 719                 goto got_super;
 720
 721         if (opt_defined(*opts, sb))
 722                 goto err;
 723
 724         printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s\n",
 725                path, err.buf);
 726         printbuf_reset(&err);
 727
 728         /*
 729          * Error reading primary superblock - read location of backup
 730          * superblocks:
 731          */
 732         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 733         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
 734         /*
 735          * use sb buffer to read layout, since sb buffer is page aligned but
 736          * layout won't be:
 737          */
 738         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
 739
 740         ret = submit_bio_wait(sb->bio);
 741         if (ret) {
 742                 prt_printf(&err, "IO error: %i", ret);
 743                 goto err;
 744         }
 745
 746         memcpy(&layout, sb->sb, sizeof(layout));
 747         ret = validate_sb_layout(&layout, &err);
 748         if (ret)
 749                 goto err;
 750
 751         for (i = layout.sb_offset;
 752              i < layout.sb_offset + layout.nr_superblocks; i++) {
 753                 offset = le64_to_cpu(*i);
 754
 755                 if (offset == opt_get(*opts, sb))
 756                         continue;
 757
 758                 ret = read_one_super(sb, offset, &err);
 759                 if (!ret)
 760                         goto got_super;
 761         }
 762
 763         goto err;
 764
 765 got_super:
 766         if (le16_to_cpu(sb->sb->block_size) << 9 <
 767             bdev_logical_block_size(sb->bdev) &&
 768             opt_get(*opts, direct_io)) {
 769 #ifndef __KERNEL__
 770                 opt_set(*opts, direct_io, false);
 771                 bch2_free_super(sb);
 772                 goto retry;
 773 #endif
 774                 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
 775                        le16_to_cpu(sb->sb->block_size) << 9,
 776                        bdev_logical_block_size(sb->bdev));
 777                 ret = -BCH_ERR_block_size_too_small;
 778                 goto err;
 779         }
 780
 781         ret = 0;
 782         sb->have_layout = true;
 783
 784         ret = bch2_sb_validate(sb, &err, READ);
 785         if (ret) {
 786                 printk(KERN_ERR "bcachefs (%s): error validating superblock: %s\n",
 787                        path, err.buf);
 788                 goto err_no_print;
 789         }
 790 out:
 791         printbuf_exit(&err);
 792         return ret;
 793 err:
 794         printk(KERN_ERR "bcachefs (%s): error reading superblock: %s\n",
 795                path, err.buf);
 796 err_no_print:
 797         bch2_free_super(sb);
 798         goto out;
 799 }
 800
 801 /* write superblock: */
 802
 803 static void write_super_endio(struct bio *bio)
 804 {
 805         struct bch_dev *ca = bio->bi_private;
 806
 807         /* XXX: return errors directly */
 808
 809         if (bch2_dev_io_err_on(bio->bi_status, ca,
 810                                bio_data_dir(bio)
 811                                ? BCH_MEMBER_ERROR_write
 812                                : BCH_MEMBER_ERROR_read,
 813                                "superblock %s error: %s",
 814                                bio_data_dir(bio) ? "write" : "read",
 815                                bch2_blk_status_to_str(bio->bi_status)))
 816                 ca->sb_write_error = 1;
 817
 818         closure_put(&ca->fs->sb_write);
 819         percpu_ref_put(&ca->io_ref);
 820 }
 821
 822 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
 823 {
 824         struct bch_sb *sb = ca->disk_sb.sb;
 825         struct bio *bio = ca->disk_sb.bio;
 826
 827         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 828         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
 829         bio->bi_end_io          = write_super_endio;
 830         bio->bi_private         = ca;
 831         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
 832
 833         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
 834                      bio_sectors(bio));
 835
 836         percpu_ref_get(&ca->io_ref);
 837         closure_bio_submit(bio, &c->sb_write);
 838 }
 839
 840 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
 841 {
 842         struct bch_sb *sb = ca->disk_sb.sb;
 843         struct bio *bio = ca->disk_sb.bio;
 844
 845         sb->offset = sb->layout.sb_offset[idx];
 846
 847         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
 848         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
 849                                 null_nonce(), sb);
 850
 851         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
 852         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
 853         bio->bi_end_io          = write_super_endio;
 854         bio->bi_private         = ca;
 855         bch2_bio_map(bio, sb,
 856                      roundup((size_t) vstruct_bytes(sb),
 857                              bdev_logical_block_size(ca->disk_sb.bdev)));
 858
 859         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
 860                      bio_sectors(bio));
 861
 862         percpu_ref_get(&ca->io_ref);
 863         closure_bio_submit(bio, &c->sb_write);
 864 }
 865
 866 int bch2_write_super(struct bch_fs *c)
 867 {
 868         struct closure *cl = &c->sb_write;
 869         struct bch_dev *ca;
 870         struct printbuf err = PRINTBUF;
 871         unsigned i, sb = 0, nr_wrote;
 872         struct bch_devs_mask sb_written;
 873         bool wrote, can_mount_without_written, can_mount_with_written;
 874         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
 875         int ret = 0;
 876
 877         trace_and_count(c, write_super, c, _RET_IP_);
 878
 879         if (c->opts.very_degraded)
 880                 degraded_flags |= BCH_FORCE_IF_LOST;
 881
 882         lockdep_assert_held(&c->sb_lock);
 883
 884         closure_init_stack(cl);
 885         memset(&sb_written, 0, sizeof(sb_written));
 886
 887         /* Make sure we're using the new magic numbers: */
 888         c->disk_sb.sb->magic = BCHFS_MAGIC;
 889         c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
 890
 891         le64_add_cpu(&c->disk_sb.sb->seq, 1);
 892
 893         if (test_bit(BCH_FS_ERROR, &c->flags))
 894                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
 895         if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags))
 896                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 897
 898         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 899
 900         bch2_sb_counters_from_cpu(c);
 901         bch2_sb_members_from_cpu(c);
 902         bch2_sb_members_cpy_v2_v1(&c->disk_sb);
 903         bch2_sb_errors_from_cpu(c);
 904
 905         for_each_online_member(ca, c, i)
 906                 bch2_sb_from_fs(c, ca);
 907
 908         for_each_online_member(ca, c, i) {
 909                 printbuf_reset(&err);
 910
 911                 ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE);
 912                 if (ret) {
 913                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
 914                         percpu_ref_put(&ca->io_ref);
 915                         goto out;
 916                 }
 917         }
 918
 919         if (c->opts.nochanges)
 920                 goto out;
 921
 922         /*
 923          * Defer writing the superblock until filesystem initialization is
 924          * complete - don't write out a partly initialized superblock:
 925          */
 926         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
 927                 goto out;
 928
 929         for_each_online_member(ca, c, i) {
 930                 __set_bit(ca->dev_idx, sb_written.d);
 931                 ca->sb_write_error = 0;
 932         }
 933
 934         for_each_online_member(ca, c, i)
 935                 read_back_super(c, ca);
 936         closure_sync(cl);
 937
 938         for_each_online_member(ca, c, i) {
 939                 if (ca->sb_write_error)
 940                         continue;
 941
 942                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
 943                         bch2_fs_fatal_error(c,
 944                                 "Superblock write was silently dropped! (seq %llu expected %llu)",
 945                                 le64_to_cpu(ca->sb_read_scratch->seq),
 946                                 ca->disk_sb.seq);
 947                         percpu_ref_put(&ca->io_ref);
 948                         ret = -BCH_ERR_erofs_sb_err;
 949                         goto out;
 950                 }
 951
 952                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
 953                         bch2_fs_fatal_error(c,
 954                                 "Superblock modified by another process (seq %llu expected %llu)",
 955                                 le64_to_cpu(ca->sb_read_scratch->seq),
 956                                 ca->disk_sb.seq);
 957                         percpu_ref_put(&ca->io_ref);
 958                         ret = -BCH_ERR_erofs_sb_err;
 959                         goto out;
 960                 }
 961         }
 962
 963         do {
 964                 wrote = false;
 965                 for_each_online_member(ca, c, i)
 966                         if (!ca->sb_write_error &&
 967                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
 968                                 write_one_super(c, ca, sb);
 969                                 wrote = true;
 970                         }
 971                 closure_sync(cl);
 972                 sb++;
 973         } while (wrote);
 974
 975         for_each_online_member(ca, c, i) {
 976                 if (ca->sb_write_error)
 977                         __clear_bit(ca->dev_idx, sb_written.d);
 978                 else
 979                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
 980         }
 981
 982         nr_wrote = dev_mask_nr(&sb_written);
 983
 984         can_mount_with_written =
 985                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 986
 987         for (i = 0; i < ARRAY_SIZE(sb_written.d); i++)
 988                 sb_written.d[i] = ~sb_written.d[i];
 989
 990         can_mount_without_written =
 991                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 992
 993         /*
 994          * If we would be able to mount _without_ the devices we successfully
 995          * wrote superblocks to, we weren't able to write to enough devices:
 996          *
 997          * Exception: if we can mount without the successes because we haven't
 998          * written anything (new filesystem), we continue if we'd be able to
 999          * mount with the devices we did successfully write to:
1000          */
1001         if (bch2_fs_fatal_err_on(!nr_wrote ||
1002                                  !can_mount_with_written ||
1003                                  (can_mount_without_written &&
1004                                   !can_mount_with_written), c,
1005                 "Unable to write superblock to sufficient devices (from %ps)",
1006                 (void *) _RET_IP_))
1007                 ret = -1;
1008 out:
1009         /* Make new options visible after they're persistent: */
1010         bch2_sb_update(c);
1011         printbuf_exit(&err);
1012         return ret;
1013 }
1014
1015 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
1016 {
1017         mutex_lock(&c->sb_lock);
1018         if (!(c->sb.features & (1ULL << feat))) {
1019                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
1020
1021                 bch2_write_super(c);
1022         }
1023         mutex_unlock(&c->sb_lock);
1024 }
1025
1026 /* Downgrade if superblock is at a higher version than currently supported: */
1027 void bch2_sb_maybe_downgrade(struct bch_fs *c)
1028 {
1029         lockdep_assert_held(&c->sb_lock);
1030
1031         /*
1032          * Downgrade, if superblock is at a higher version than currently
1033          * supported:
1034          */
1035         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
1036                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1037         if (c->sb.version > bcachefs_metadata_version_current)
1038                 c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
1039         if (c->sb.version_min > bcachefs_metadata_version_current)
1040                 c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
1041         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1042 }
1043
1044 void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
1045 {
1046         lockdep_assert_held(&c->sb_lock);
1047
1048         c->disk_sb.sb->version = cpu_to_le16(new_version);
1049         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
1050 }
1051
1052 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1053 #define x(f, nr)                                        \
1054         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1055         BCH_SB_FIELDS()
1056 #undef x
1057 };
1058
1059 static const struct bch_sb_field_ops bch2_sb_field_null_ops;
1060
1061 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
1062 {
1063         return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
1064                 ? bch2_sb_field_ops[type]
1065                 : &bch2_sb_field_null_ops;
1066 }
1067
1068 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1069                                   struct printbuf *err)
1070 {
1071         unsigned type = le32_to_cpu(f->type);
1072         struct printbuf field_err = PRINTBUF;
1073         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1074         int ret;
1075
1076         ret = ops->validate ? ops->validate(sb, f, &field_err) : 0;
1077         if (ret) {
1078                 prt_printf(err, "Invalid superblock section %s: %s",
1079                            bch2_sb_fields[type], field_err.buf);
1080                 prt_newline(err);
1081                 bch2_sb_field_to_text(err, sb, f);
1082         }
1083
1084         printbuf_exit(&field_err);
1085         return ret;
1086 }
1087
1088 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1089                            struct bch_sb_field *f)
1090 {
1091         unsigned type = le32_to_cpu(f->type);
1092         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1093
1094         if (!out->nr_tabstops)
1095                 printbuf_tabstop_push(out, 32);
1096
1097         if (type < BCH_SB_FIELD_NR)
1098                 prt_printf(out, "%s", bch2_sb_fields[type]);
1099         else
1100                 prt_printf(out, "(unknown field %u)", type);
1101
1102         prt_printf(out, " (size %zu):", vstruct_bytes(f));
1103         prt_newline(out);
1104
1105         if (ops->to_text) {
1106                 printbuf_indent_add(out, 2);
1107                 ops->to_text(out, sb, f);
1108                 printbuf_indent_sub(out, 2);
1109         }
1110 }
1111
1112 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1113 {
1114         unsigned i;
1115
1116         prt_printf(out, "Type:                    %u", l->layout_type);
1117         prt_newline(out);
1118
1119         prt_str(out, "Superblock max size:     ");
1120         prt_units_u64(out, 512 << l->sb_max_size_bits);
1121         prt_newline(out);
1122
1123         prt_printf(out, "Nr superblocks:          %u", l->nr_superblocks);
1124         prt_newline(out);
1125
1126         prt_str(out, "Offsets:                 ");
1127         for (i = 0; i < l->nr_superblocks; i++) {
1128                 if (i)
1129                         prt_str(out, ", ");
1130                 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1131         }
1132         prt_newline(out);
1133 }
1134
1135 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1136                      bool print_layout, unsigned fields)
1137 {
1138         struct bch_sb_field *f;
1139         u64 fields_have = 0;
1140         unsigned nr_devices = 0;
1141
1142         if (!out->nr_tabstops)
1143                 printbuf_tabstop_push(out, 44);
1144
1145         for (int i = 0; i < sb->nr_devices; i++)
1146                 nr_devices += bch2_dev_exists(sb, i);
1147
1148         prt_printf(out, "External UUID:");
1149         prt_tab(out);
1150         pr_uuid(out, sb->user_uuid.b);
1151         prt_newline(out);
1152
1153         prt_printf(out, "Internal UUID:");
1154         prt_tab(out);
1155         pr_uuid(out, sb->uuid.b);
1156         prt_newline(out);
1157
1158         prt_str(out, "Device index:");
1159         prt_tab(out);
1160         prt_printf(out, "%u", sb->dev_idx);
1161         prt_newline(out);
1162
1163         prt_str(out, "Label:");
1164         prt_tab(out);
1165         prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1166         prt_newline(out);
1167
1168         prt_str(out, "Version:");
1169         prt_tab(out);
1170         bch2_version_to_text(out, le16_to_cpu(sb->version));
1171         prt_newline(out);
1172
1173         prt_str(out, "Version upgrade complete:");
1174         prt_tab(out);
1175         bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
1176         prt_newline(out);
1177
1178         prt_printf(out, "Oldest version on disk:");
1179         prt_tab(out);
1180         bch2_version_to_text(out, le16_to_cpu(sb->version_min));
1181         prt_newline(out);
1182
1183         prt_printf(out, "Created:");
1184         prt_tab(out);
1185         if (sb->time_base_lo)
1186                 bch2_prt_date_seconds(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1187         else
1188                 prt_printf(out, "(not set)");
1189         prt_newline(out);
1190
1191         prt_printf(out, "Sequence number:");
1192         prt_tab(out);
1193         prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1194         prt_newline(out);
1195
1196         prt_printf(out, "Superblock size:");
1197         prt_tab(out);
1198         prt_printf(out, "%zu", vstruct_bytes(sb));
1199         prt_newline(out);
1200
1201         prt_printf(out, "Clean:");
1202         prt_tab(out);
1203         prt_printf(out, "%llu", BCH_SB_CLEAN(sb));
1204         prt_newline(out);
1205
1206         prt_printf(out, "Devices:");
1207         prt_tab(out);
1208         prt_printf(out, "%u", nr_devices);
1209         prt_newline(out);
1210
1211         prt_printf(out, "Sections:");
1212         vstruct_for_each(sb, f)
1213                 fields_have |= 1 << le32_to_cpu(f->type);
1214         prt_tab(out);
1215         prt_bitflags(out, bch2_sb_fields, fields_have);
1216         prt_newline(out);
1217
1218         prt_printf(out, "Features:");
1219         prt_tab(out);
1220         prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1221         prt_newline(out);
1222
1223         prt_printf(out, "Compat features:");
1224         prt_tab(out);
1225         prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1226         prt_newline(out);
1227
1228         prt_newline(out);
1229         prt_printf(out, "Options:");
1230         prt_newline(out);
1231         printbuf_indent_add(out, 2);
1232         {
1233                 enum bch_opt_id id;
1234
1235                 for (id = 0; id < bch2_opts_nr; id++) {
1236                         const struct bch_option *opt = bch2_opt_table + id;
1237
1238                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1239                                 u64 v = bch2_opt_from_sb(sb, id);
1240
1241                                 prt_printf(out, "%s:", opt->attr.name);
1242                                 prt_tab(out);
1243                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1244                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1245                                 prt_newline(out);
1246                         }
1247                 }
1248         }
1249
1250         printbuf_indent_sub(out, 2);
1251
1252         if (print_layout) {
1253                 prt_newline(out);
1254                 prt_printf(out, "layout:");
1255                 prt_newline(out);
1256                 printbuf_indent_add(out, 2);
1257                 bch2_sb_layout_to_text(out, &sb->layout);
1258                 printbuf_indent_sub(out, 2);
1259         }
1260
1261         vstruct_for_each(sb, f)
1262                 if (fields & (1 << le32_to_cpu(f->type))) {
1263                         prt_newline(out);
1264                         bch2_sb_field_to_text(out, sb, f);
1265                 }
1266 }