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         /* XXX: need locking around superblock to access optional fields */
 104
 105         vstruct_for_each(sb, f)
 106                 if (le32_to_cpu(f->type) == type)
 107                         return f;
 108         return NULL;
 109 }
 110
 111 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
 112                                                    struct bch_sb_field *f,
 113                                                    unsigned u64s)
 114 {
 115         unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 116         unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
 117
 118         BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
 119
 120         if (!f && !u64s) {
 121                 /* nothing to do: */
 122         } else if (!f) {
 123                 f = vstruct_last(sb->sb);
 124                 memset(f, 0, sizeof(u64) * u64s);
 125                 f->u64s = cpu_to_le32(u64s);
 126                 f->type = 0;
 127         } else {
 128                 void *src, *dst;
 129
 130                 src = vstruct_end(f);
 131
 132                 if (u64s) {
 133                         f->u64s = cpu_to_le32(u64s);
 134                         dst = vstruct_end(f);
 135                 } else {
 136                         dst = f;
 137                 }
 138
 139                 memmove(dst, src, vstruct_end(sb->sb) - src);
 140
 141                 if (dst > src)
 142                         memset(src, 0, dst - src);
 143         }
 144
 145         sb->sb->u64s = cpu_to_le32(sb_u64s);
 146
 147         return u64s ? f : NULL;
 148 }
 149
 150 void bch2_sb_field_delete(struct bch_sb_handle *sb,
 151                           enum bch_sb_field_type type)
 152 {
 153         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 154
 155         if (f)
 156                 __bch2_sb_field_resize(sb, f, 0);
 157 }
 158
 159 /* Superblock realloc/free: */
 160
 161 void bch2_free_super(struct bch_sb_handle *sb)
 162 {
 163         kfree(sb->bio);
 164         if (!IS_ERR_OR_NULL(sb->bdev))
 165                 blkdev_put(sb->bdev, sb->holder);
 166         kfree(sb->holder);
 167         kfree(sb->sb_name);
 168
 169         kfree(sb->sb);
 170         memset(sb, 0, sizeof(*sb));
 171 }
 172
 173 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 174 {
 175         size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
 176         size_t new_buffer_size;
 177         struct bch_sb *new_sb;
 178         struct bio *bio;
 179
 180         if (sb->bdev)
 181                 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
 182
 183         new_buffer_size = roundup_pow_of_two(new_bytes);
 184
 185         if (sb->sb && sb->buffer_size >= new_buffer_size)
 186                 return 0;
 187
 188         if (sb->sb && sb->have_layout) {
 189                 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
 190
 191                 if (new_bytes > max_bytes) {
 192                         pr_err("%pg: superblock too big: want %zu but have %llu",
 193                                sb->bdev, new_bytes, max_bytes);
 194                         return -BCH_ERR_ENOSPC_sb;
 195                 }
 196         }
 197
 198         if (sb->buffer_size >= new_buffer_size && sb->sb)
 199                 return 0;
 200
 201         if (dynamic_fault("bcachefs:add:super_realloc"))
 202                 return -BCH_ERR_ENOMEM_sb_realloc_injected;
 203
 204         new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
 205         if (!new_sb)
 206                 return -BCH_ERR_ENOMEM_sb_buf_realloc;
 207
 208         sb->sb = new_sb;
 209
 210         if (sb->have_bio) {
 211                 unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size);
 212
 213                 bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
 214                 if (!bio)
 215                         return -BCH_ERR_ENOMEM_sb_bio_realloc;
 216
 217                 bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
 218
 219                 kfree(sb->bio);
 220                 sb->bio = bio;
 221         }
 222
 223         sb->buffer_size = new_buffer_size;
 224
 225         return 0;
 226 }
 227
 228 struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb,
 229                                           enum bch_sb_field_type type,
 230                                           unsigned u64s)
 231 {
 232         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 233         ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 234         ssize_t d = -old_u64s + u64s;
 235
 236         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
 237                 return NULL;
 238
 239         if (sb->fs_sb) {
 240                 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
 241
 242                 lockdep_assert_held(&c->sb_lock);
 243
 244                 /* XXX: we're not checking that offline device have enough space */
 245
 246                 for_each_online_member(c, ca) {
 247                         struct bch_sb_handle *dev_sb = &ca->disk_sb;
 248
 249                         if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
 250                                 percpu_ref_put(&ca->ref);
 251                                 return NULL;
 252                         }
 253                 }
 254         }
 255
 256         f = bch2_sb_field_get_id(sb->sb, type);
 257         f = __bch2_sb_field_resize(sb, f, u64s);
 258         if (f)
 259                 f->type = cpu_to_le32(type);
 260         return f;
 261 }
 262
 263 /* Superblock validate: */
 264
 265 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
 266 {
 267         u64 offset, prev_offset, max_sectors;
 268         unsigned i;
 269
 270         BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
 271
 272         if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
 273             !uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
 274                 prt_printf(out, "Not a bcachefs superblock layout");
 275                 return -BCH_ERR_invalid_sb_layout;
 276         }
 277
 278         if (layout->layout_type != 0) {
 279                 prt_printf(out, "Invalid superblock layout type %u",
 280                        layout->layout_type);
 281                 return -BCH_ERR_invalid_sb_layout_type;
 282         }
 283
 284         if (!layout->nr_superblocks) {
 285                 prt_printf(out, "Invalid superblock layout: no superblocks");
 286                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 287         }
 288
 289         if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
 290                 prt_printf(out, "Invalid superblock layout: too many superblocks");
 291                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 292         }
 293
 294         max_sectors = 1 << layout->sb_max_size_bits;
 295
 296         prev_offset = le64_to_cpu(layout->sb_offset[0]);
 297
 298         for (i = 1; i < layout->nr_superblocks; i++) {
 299                 offset = le64_to_cpu(layout->sb_offset[i]);
 300
 301                 if (offset < prev_offset + max_sectors) {
 302                         prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
 303                                "  (sb %u ends at %llu next starts at %llu",
 304                                i - 1, prev_offset + max_sectors, offset);
 305                         return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
 306                 }
 307                 prev_offset = offset;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out)
 314 {
 315         u16 version             = le16_to_cpu(sb->version);
 316         u16 version_min         = le16_to_cpu(sb->version_min);
 317
 318         if (!bch2_version_compatible(version)) {
 319                 prt_str(out, "Unsupported superblock version ");
 320                 bch2_version_to_text(out, version);
 321                 prt_str(out, " (min ");
 322                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 323                 prt_str(out, ", max ");
 324                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 325                 prt_str(out, ")");
 326                 return -BCH_ERR_invalid_sb_version;
 327         }
 328
 329         if (!bch2_version_compatible(version_min)) {
 330                 prt_str(out, "Unsupported superblock version_min ");
 331                 bch2_version_to_text(out, version_min);
 332                 prt_str(out, " (min ");
 333                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 334                 prt_str(out, ", max ");
 335                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 336                 prt_str(out, ")");
 337                 return -BCH_ERR_invalid_sb_version;
 338         }
 339
 340         if (version_min > version) {
 341                 prt_str(out, "Bad minimum version ");
 342                 bch2_version_to_text(out, version_min);
 343                 prt_str(out, ", greater than version field ");
 344                 bch2_version_to_text(out, version);
 345                 return -BCH_ERR_invalid_sb_version;
 346         }
 347
 348         return 0;
 349 }
 350
 351 static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 352                             int rw)
 353 {
 354         struct bch_sb *sb = disk_sb->sb;
 355         struct bch_sb_field_members_v1 *mi;
 356         enum bch_opt_id opt_id;
 357         u16 block_size;
 358         int ret;
 359
 360         ret = bch2_sb_compatible(sb, out);
 361         if (ret)
 362                 return ret;
 363
 364         if (sb->features[1] ||
 365             (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
 366                 prt_printf(out, "Filesystem has incompatible features");
 367                 return -BCH_ERR_invalid_sb_features;
 368         }
 369
 370         block_size = le16_to_cpu(sb->block_size);
 371
 372         if (block_size > PAGE_SECTORS) {
 373                 prt_printf(out, "Block size too big (got %u, max %u)",
 374                        block_size, PAGE_SECTORS);
 375                 return -BCH_ERR_invalid_sb_block_size;
 376         }
 377
 378         if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
 379                 prt_printf(out, "Bad user UUID (got zeroes)");
 380                 return -BCH_ERR_invalid_sb_uuid;
 381         }
 382
 383         if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
 384                 prt_printf(out, "Bad internal UUID (got zeroes)");
 385                 return -BCH_ERR_invalid_sb_uuid;
 386         }
 387
 388         if (!sb->nr_devices ||
 389             sb->nr_devices > BCH_SB_MEMBERS_MAX) {
 390                 prt_printf(out, "Bad number of member devices %u (max %u)",
 391                        sb->nr_devices, BCH_SB_MEMBERS_MAX);
 392                 return -BCH_ERR_invalid_sb_too_many_members;
 393         }
 394
 395         if (sb->dev_idx >= sb->nr_devices) {
 396                 prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
 397                        sb->dev_idx, sb->nr_devices);
 398                 return -BCH_ERR_invalid_sb_dev_idx;
 399         }
 400
 401         if (!sb->time_precision ||
 402             le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
 403                 prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
 404                        le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
 405                 return -BCH_ERR_invalid_sb_time_precision;
 406         }
 407
 408         if (rw == READ) {
 409                 /*
 410                  * Been seeing a bug where these are getting inexplicably
 411                  * zeroed, so we're now validating them, but we have to be
 412                  * careful not to preven people's filesystems from mounting:
 413                  */
 414                 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
 415                         SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 416                 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 417                         SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
 418
 419                 if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb))
 420                         SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version));
 421         }
 422
 423         for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
 424                 const struct bch_option *opt = bch2_opt_table + opt_id;
 425
 426                 if (opt->get_sb != BCH2_NO_SB_OPT) {
 427                         u64 v = bch2_opt_from_sb(sb, opt_id);
 428
 429                         prt_printf(out, "Invalid option ");
 430                         ret = bch2_opt_validate(opt, v, out);
 431                         if (ret)
 432                                 return ret;
 433
 434                         printbuf_reset(out);
 435                 }
 436         }
 437
 438         /* validate layout */
 439         ret = validate_sb_layout(&sb->layout, out);
 440         if (ret)
 441                 return ret;
 442
 443         vstruct_for_each(sb, f) {
 444                 if (!f->u64s) {
 445                         prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
 446                                le32_to_cpu(f->type));
 447                         return -BCH_ERR_invalid_sb_field_size;
 448                 }
 449
 450                 if (vstruct_next(f) > vstruct_last(sb)) {
 451                         prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
 452                                le32_to_cpu(f->type));
 453                         return -BCH_ERR_invalid_sb_field_size;
 454                 }
 455         }
 456
 457         /* members must be validated first: */
 458         mi = bch2_sb_field_get(sb, members_v1);
 459         if (!mi) {
 460                 prt_printf(out, "Invalid superblock: member info area missing");
 461                 return -BCH_ERR_invalid_sb_members_missing;
 462         }
 463
 464         ret = bch2_sb_field_validate(sb, &mi->field, out);
 465         if (ret)
 466                 return ret;
 467
 468         vstruct_for_each(sb, f) {
 469                 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1)
 470                         continue;
 471
 472                 ret = bch2_sb_field_validate(sb, f, out);
 473                 if (ret)
 474                         return ret;
 475         }
 476
 477         return 0;
 478 }
 479
 480 /* device open: */
 481
 482 static void bch2_sb_update(struct bch_fs *c)
 483 {
 484         struct bch_sb *src = c->disk_sb.sb;
 485
 486         lockdep_assert_held(&c->sb_lock);
 487
 488         c->sb.uuid              = src->uuid;
 489         c->sb.user_uuid         = src->user_uuid;
 490         c->sb.version           = le16_to_cpu(src->version);
 491         c->sb.version_min       = le16_to_cpu(src->version_min);
 492         c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
 493         c->sb.nr_devices        = src->nr_devices;
 494         c->sb.clean             = BCH_SB_CLEAN(src);
 495         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
 496
 497         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 498         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
 499
 500         /* XXX this is wrong, we need a 96 or 128 bit integer type */
 501         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
 502                                           c->sb.nsec_per_time_unit);
 503         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
 504
 505         c->sb.features          = le64_to_cpu(src->features[0]);
 506         c->sb.compat            = le64_to_cpu(src->compat[0]);
 507
 508         for_each_member_device(c, ca) {
 509                 struct bch_member m = bch2_sb_member_get(src, ca->dev_idx);
 510                 ca->mi = bch2_mi_to_cpu(&m);
 511         }
 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_id(src, i);
 545                 dst_f = bch2_sb_field_get_id(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,
 551                                         le32_to_cpu(dst_handle->sb->u64s) + d);
 552
 553                         if (ret)
 554                                 return ret;
 555
 556                         dst = dst_handle->sb;
 557                         dst_f = bch2_sb_field_get_id(dst, i);
 558                 }
 559
 560                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
 561                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
 562
 563                 if (src_f)
 564                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
 565         }
 566
 567         return 0;
 568 }
 569
 570 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
 571 {
 572         int ret;
 573
 574         lockdep_assert_held(&c->sb_lock);
 575
 576         ret =   bch2_sb_realloc(&c->disk_sb, 0) ?:
 577                 __copy_super(&c->disk_sb, src) ?:
 578                 bch2_sb_replicas_to_cpu_replicas(c) ?:
 579                 bch2_sb_disk_groups_to_cpu(c);
 580         if (ret)
 581                 return ret;
 582
 583         bch2_sb_update(c);
 584         return 0;
 585 }
 586
 587 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
 588 {
 589         return __copy_super(&ca->disk_sb, c->disk_sb.sb);
 590 }
 591
 592 /* read superblock: */
 593
 594 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
 595 {
 596         struct bch_csum csum;
 597         size_t bytes;
 598         int ret;
 599 reread:
 600         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 601         sb->bio->bi_iter.bi_sector = offset;
 602         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
 603
 604         ret = submit_bio_wait(sb->bio);
 605         if (ret) {
 606                 prt_printf(err, "IO error: %i", ret);
 607                 return ret;
 608         }
 609
 610         if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
 611             !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
 612                 prt_printf(err, "Not a bcachefs superblock");
 613                 return -BCH_ERR_invalid_sb_magic;
 614         }
 615
 616         ret = bch2_sb_compatible(sb->sb, err);
 617         if (ret)
 618                 return ret;
 619
 620         bytes = vstruct_bytes(sb->sb);
 621
 622         if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
 623                 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
 624                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
 625                 return -BCH_ERR_invalid_sb_too_big;
 626         }
 627
 628         if (bytes > sb->buffer_size) {
 629                 ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
 630                 if (ret)
 631                         return ret;
 632                 goto reread;
 633         }
 634
 635         if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
 636                 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
 637                 return -BCH_ERR_invalid_sb_csum_type;
 638         }
 639
 640         /* XXX: verify MACs */
 641         csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
 642                             null_nonce(), sb->sb);
 643
 644         if (bch2_crc_cmp(csum, sb->sb->csum)) {
 645                 prt_printf(err, "bad checksum");
 646                 return -BCH_ERR_invalid_sb_csum;
 647         }
 648
 649         sb->seq = le64_to_cpu(sb->sb->seq);
 650
 651         return 0;
 652 }
 653
 654 static int __bch2_read_super(const char *path, struct bch_opts *opts,
 655                     struct bch_sb_handle *sb, bool ignore_notbchfs_msg)
 656 {
 657         u64 offset = opt_get(*opts, sb);
 658         struct bch_sb_layout layout;
 659         struct printbuf err = PRINTBUF;
 660         struct printbuf err2 = PRINTBUF;
 661         __le64 *i;
 662         int ret;
 663 #ifndef __KERNEL__
 664 retry:
 665 #endif
 666         memset(sb, 0, sizeof(*sb));
 667         sb->mode        = BLK_OPEN_READ;
 668         sb->have_bio    = true;
 669         sb->holder      = kmalloc(1, GFP_KERNEL);
 670         if (!sb->holder)
 671                 return -ENOMEM;
 672
 673         sb->sb_name = kstrdup(path, GFP_KERNEL);
 674         if (!sb->sb_name)
 675                 return -ENOMEM;
 676
 677 #ifndef __KERNEL__
 678         if (opt_get(*opts, direct_io) == false)
 679                 sb->mode |= BLK_OPEN_BUFFERED;
 680 #endif
 681
 682         if (!opt_get(*opts, noexcl))
 683                 sb->mode |= BLK_OPEN_EXCL;
 684
 685         if (!opt_get(*opts, nochanges))
 686                 sb->mode |= BLK_OPEN_WRITE;
 687
 688         sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 689         if (IS_ERR(sb->bdev) &&
 690             PTR_ERR(sb->bdev) == -EACCES &&
 691             opt_get(*opts, read_only)) {
 692                 sb->mode &= ~BLK_OPEN_WRITE;
 693
 694                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 695                 if (!IS_ERR(sb->bdev))
 696                         opt_set(*opts, nochanges, true);
 697         }
 698
 699         if (IS_ERR(sb->bdev)) {
 700                 ret = PTR_ERR(sb->bdev);
 701                 goto out;
 702         }
 703
 704         ret = bch2_sb_realloc(sb, 0);
 705         if (ret) {
 706                 prt_printf(&err, "error allocating memory for superblock");
 707                 goto err;
 708         }
 709
 710         if (bch2_fs_init_fault("read_super")) {
 711                 prt_printf(&err, "dynamic fault");
 712                 ret = -EFAULT;
 713                 goto err;
 714         }
 715
 716         ret = read_one_super(sb, offset, &err);
 717         if (!ret)
 718                 goto got_super;
 719
 720         if (opt_defined(*opts, sb))
 721                 goto err;
 722
 723         prt_printf(&err2, "bcachefs (%s): error reading default superblock: %s\n",
 724                path, err.buf);
 725         if (ret == -BCH_ERR_invalid_sb_magic && ignore_notbchfs_msg)
 726                 printk(KERN_INFO "%s", err2.buf);
 727         else
 728                 printk(KERN_ERR "%s", err2.buf);
 729
 730         printbuf_exit(&err2);
 731         printbuf_reset(&err);
 732
 733         /*
 734          * Error reading primary superblock - read location of backup
 735          * superblocks:
 736          */
 737         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 738         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
 739         /*
 740          * use sb buffer to read layout, since sb buffer is page aligned but
 741          * layout won't be:
 742          */
 743         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
 744
 745         ret = submit_bio_wait(sb->bio);
 746         if (ret) {
 747                 prt_printf(&err, "IO error: %i", ret);
 748                 goto err;
 749         }
 750
 751         memcpy(&layout, sb->sb, sizeof(layout));
 752         ret = validate_sb_layout(&layout, &err);
 753         if (ret)
 754                 goto err;
 755
 756         for (i = layout.sb_offset;
 757              i < layout.sb_offset + layout.nr_superblocks; i++) {
 758                 offset = le64_to_cpu(*i);
 759
 760                 if (offset == opt_get(*opts, sb))
 761                         continue;
 762
 763                 ret = read_one_super(sb, offset, &err);
 764                 if (!ret)
 765                         goto got_super;
 766         }
 767
 768         goto err;
 769
 770 got_super:
 771         if (le16_to_cpu(sb->sb->block_size) << 9 <
 772             bdev_logical_block_size(sb->bdev) &&
 773             opt_get(*opts, direct_io)) {
 774 #ifndef __KERNEL__
 775                 opt_set(*opts, direct_io, false);
 776                 bch2_free_super(sb);
 777                 goto retry;
 778 #endif
 779                 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
 780                        le16_to_cpu(sb->sb->block_size) << 9,
 781                        bdev_logical_block_size(sb->bdev));
 782                 ret = -BCH_ERR_block_size_too_small;
 783                 goto err;
 784         }
 785
 786         ret = 0;
 787         sb->have_layout = true;
 788
 789         ret = bch2_sb_validate(sb, &err, READ);
 790         if (ret) {
 791                 printk(KERN_ERR "bcachefs (%s): error validating superblock: %s\n",
 792                        path, err.buf);
 793                 goto err_no_print;
 794         }
 795 out:
 796         printbuf_exit(&err);
 797         return ret;
 798 err:
 799         printk(KERN_ERR "bcachefs (%s): error reading superblock: %s\n",
 800                path, err.buf);
 801 err_no_print:
 802         bch2_free_super(sb);
 803         goto out;
 804 }
 805
 806 int bch2_read_super(const char *path, struct bch_opts *opts,
 807                     struct bch_sb_handle *sb)
 808 {
 809         return __bch2_read_super(path, opts, sb, false);
 810 }
 811
 812 /* provide a silenced version for mount.bcachefs */
 813
 814 int bch2_read_super_silent(const char *path, struct bch_opts *opts,
 815                     struct bch_sb_handle *sb)
 816 {
 817         return __bch2_read_super(path, opts, sb, true);
 818 }
 819
 820 /* write superblock: */
 821
 822 static void write_super_endio(struct bio *bio)
 823 {
 824         struct bch_dev *ca = bio->bi_private;
 825
 826         /* XXX: return errors directly */
 827
 828         if (bch2_dev_io_err_on(bio->bi_status, ca,
 829                                bio_data_dir(bio)
 830                                ? BCH_MEMBER_ERROR_write
 831                                : BCH_MEMBER_ERROR_read,
 832                                "superblock %s error: %s",
 833                                bio_data_dir(bio) ? "write" : "read",
 834                                bch2_blk_status_to_str(bio->bi_status)))
 835                 ca->sb_write_error = 1;
 836
 837         closure_put(&ca->fs->sb_write);
 838         percpu_ref_put(&ca->io_ref);
 839 }
 840
 841 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
 842 {
 843         struct bch_sb *sb = ca->disk_sb.sb;
 844         struct bio *bio = ca->disk_sb.bio;
 845
 846         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 847         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
 848         bio->bi_end_io          = write_super_endio;
 849         bio->bi_private         = ca;
 850         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
 851
 852         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
 853                      bio_sectors(bio));
 854
 855         percpu_ref_get(&ca->io_ref);
 856         closure_bio_submit(bio, &c->sb_write);
 857 }
 858
 859 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
 860 {
 861         struct bch_sb *sb = ca->disk_sb.sb;
 862         struct bio *bio = ca->disk_sb.bio;
 863
 864         sb->offset = sb->layout.sb_offset[idx];
 865
 866         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
 867         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
 868                                 null_nonce(), sb);
 869
 870         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
 871         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
 872         bio->bi_end_io          = write_super_endio;
 873         bio->bi_private         = ca;
 874         bch2_bio_map(bio, sb,
 875                      roundup((size_t) vstruct_bytes(sb),
 876                              bdev_logical_block_size(ca->disk_sb.bdev)));
 877
 878         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
 879                      bio_sectors(bio));
 880
 881         percpu_ref_get(&ca->io_ref);
 882         closure_bio_submit(bio, &c->sb_write);
 883 }
 884
 885 int bch2_write_super(struct bch_fs *c)
 886 {
 887         struct closure *cl = &c->sb_write;
 888         struct printbuf err = PRINTBUF;
 889         unsigned sb = 0, nr_wrote;
 890         struct bch_devs_mask sb_written;
 891         bool wrote, can_mount_without_written, can_mount_with_written;
 892         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
 893         int ret = 0;
 894
 895         trace_and_count(c, write_super, c, _RET_IP_);
 896
 897         if (c->opts.very_degraded)
 898                 degraded_flags |= BCH_FORCE_IF_LOST;
 899
 900         lockdep_assert_held(&c->sb_lock);
 901
 902         closure_init_stack(cl);
 903         memset(&sb_written, 0, sizeof(sb_written));
 904
 905         /* Make sure we're using the new magic numbers: */
 906         c->disk_sb.sb->magic = BCHFS_MAGIC;
 907         c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
 908
 909         le64_add_cpu(&c->disk_sb.sb->seq, 1);
 910
 911         if (test_bit(BCH_FS_error, &c->flags))
 912                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
 913         if (test_bit(BCH_FS_topology_error, &c->flags))
 914                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 915
 916         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 917
 918         bch2_sb_counters_from_cpu(c);
 919         bch2_sb_members_from_cpu(c);
 920         bch2_sb_members_cpy_v2_v1(&c->disk_sb);
 921         bch2_sb_errors_from_cpu(c);
 922
 923         for_each_online_member(c, ca)
 924                 bch2_sb_from_fs(c, ca);
 925
 926         for_each_online_member(c, ca) {
 927                 printbuf_reset(&err);
 928
 929                 ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE);
 930                 if (ret) {
 931                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
 932                         percpu_ref_put(&ca->io_ref);
 933                         goto out;
 934                 }
 935         }
 936
 937         if (c->opts.nochanges)
 938                 goto out;
 939
 940         /*
 941          * Defer writing the superblock until filesystem initialization is
 942          * complete - don't write out a partly initialized superblock:
 943          */
 944         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
 945                 goto out;
 946
 947         for_each_online_member(c, ca) {
 948                 __set_bit(ca->dev_idx, sb_written.d);
 949                 ca->sb_write_error = 0;
 950         }
 951
 952         for_each_online_member(c, ca)
 953                 read_back_super(c, ca);
 954         closure_sync(cl);
 955
 956         for_each_online_member(c, ca) {
 957                 if (ca->sb_write_error)
 958                         continue;
 959
 960                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
 961                         bch2_fs_fatal_error(c,
 962                                 "Superblock write was silently dropped! (seq %llu expected %llu)",
 963                                 le64_to_cpu(ca->sb_read_scratch->seq),
 964                                 ca->disk_sb.seq);
 965                         percpu_ref_put(&ca->io_ref);
 966                         ret = -BCH_ERR_erofs_sb_err;
 967                         goto out;
 968                 }
 969
 970                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
 971                         bch2_fs_fatal_error(c,
 972                                 "Superblock modified by another process (seq %llu expected %llu)",
 973                                 le64_to_cpu(ca->sb_read_scratch->seq),
 974                                 ca->disk_sb.seq);
 975                         percpu_ref_put(&ca->io_ref);
 976                         ret = -BCH_ERR_erofs_sb_err;
 977                         goto out;
 978                 }
 979         }
 980
 981         do {
 982                 wrote = false;
 983                 for_each_online_member(c, ca)
 984                         if (!ca->sb_write_error &&
 985                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
 986                                 write_one_super(c, ca, sb);
 987                                 wrote = true;
 988                         }
 989                 closure_sync(cl);
 990                 sb++;
 991         } while (wrote);
 992
 993         for_each_online_member(c, ca) {
 994                 if (ca->sb_write_error)
 995                         __clear_bit(ca->dev_idx, sb_written.d);
 996                 else
 997                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
 998         }
 999
1000         nr_wrote = dev_mask_nr(&sb_written);
1001
1002         can_mount_with_written =
1003                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
1004
1005         for (unsigned i = 0; i < ARRAY_SIZE(sb_written.d); i++)
1006                 sb_written.d[i] = ~sb_written.d[i];
1007
1008         can_mount_without_written =
1009                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
1010
1011         /*
1012          * If we would be able to mount _without_ the devices we successfully
1013          * wrote superblocks to, we weren't able to write to enough devices:
1014          *
1015          * Exception: if we can mount without the successes because we haven't
1016          * written anything (new filesystem), we continue if we'd be able to
1017          * mount with the devices we did successfully write to:
1018          */
1019         if (bch2_fs_fatal_err_on(!nr_wrote ||
1020                                  !can_mount_with_written ||
1021                                  (can_mount_without_written &&
1022                                   !can_mount_with_written), c,
1023                 "Unable to write superblock to sufficient devices (from %ps)",
1024                 (void *) _RET_IP_))
1025                 ret = -1;
1026 out:
1027         /* Make new options visible after they're persistent: */
1028         bch2_sb_update(c);
1029         printbuf_exit(&err);
1030         return ret;
1031 }
1032
1033 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
1034 {
1035         mutex_lock(&c->sb_lock);
1036         if (!(c->sb.features & (1ULL << feat))) {
1037                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
1038
1039                 bch2_write_super(c);
1040         }
1041         mutex_unlock(&c->sb_lock);
1042 }
1043
1044 /* Downgrade if superblock is at a higher version than currently supported: */
1045 void bch2_sb_maybe_downgrade(struct bch_fs *c)
1046 {
1047         lockdep_assert_held(&c->sb_lock);
1048
1049         /*
1050          * Downgrade, if superblock is at a higher version than currently
1051          * supported:
1052          */
1053         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
1054                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1055         if (c->sb.version > bcachefs_metadata_version_current)
1056                 c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
1057         if (c->sb.version_min > bcachefs_metadata_version_current)
1058                 c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
1059         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1060 }
1061
1062 void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
1063 {
1064         lockdep_assert_held(&c->sb_lock);
1065
1066         c->disk_sb.sb->version = cpu_to_le16(new_version);
1067         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
1068 }
1069
1070 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1071 #define x(f, nr)                                        \
1072         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1073         BCH_SB_FIELDS()
1074 #undef x
1075 };
1076
1077 static const struct bch_sb_field_ops bch2_sb_field_null_ops;
1078
1079 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
1080 {
1081         return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
1082                 ? bch2_sb_field_ops[type]
1083                 : &bch2_sb_field_null_ops;
1084 }
1085
1086 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1087                                   struct printbuf *err)
1088 {
1089         unsigned type = le32_to_cpu(f->type);
1090         struct printbuf field_err = PRINTBUF;
1091         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1092         int ret;
1093
1094         ret = ops->validate ? ops->validate(sb, f, &field_err) : 0;
1095         if (ret) {
1096                 prt_printf(err, "Invalid superblock section %s: %s",
1097                            bch2_sb_fields[type], field_err.buf);
1098                 prt_newline(err);
1099                 bch2_sb_field_to_text(err, sb, f);
1100         }
1101
1102         printbuf_exit(&field_err);
1103         return ret;
1104 }
1105
1106 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1107                            struct bch_sb_field *f)
1108 {
1109         unsigned type = le32_to_cpu(f->type);
1110         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1111
1112         if (!out->nr_tabstops)
1113                 printbuf_tabstop_push(out, 32);
1114
1115         if (type < BCH_SB_FIELD_NR)
1116                 prt_printf(out, "%s", bch2_sb_fields[type]);
1117         else
1118                 prt_printf(out, "(unknown field %u)", type);
1119
1120         prt_printf(out, " (size %zu):", vstruct_bytes(f));
1121         prt_newline(out);
1122
1123         if (ops->to_text) {
1124                 printbuf_indent_add(out, 2);
1125                 ops->to_text(out, sb, f);
1126                 printbuf_indent_sub(out, 2);
1127         }
1128 }
1129
1130 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1131 {
1132         unsigned i;
1133
1134         prt_printf(out, "Type:                    %u", l->layout_type);
1135         prt_newline(out);
1136
1137         prt_str(out, "Superblock max size:     ");
1138         prt_units_u64(out, 512 << l->sb_max_size_bits);
1139         prt_newline(out);
1140
1141         prt_printf(out, "Nr superblocks:          %u", l->nr_superblocks);
1142         prt_newline(out);
1143
1144         prt_str(out, "Offsets:                 ");
1145         for (i = 0; i < l->nr_superblocks; i++) {
1146                 if (i)
1147                         prt_str(out, ", ");
1148                 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1149         }
1150         prt_newline(out);
1151 }
1152
1153 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1154                      bool print_layout, unsigned fields)
1155 {
1156         u64 fields_have = 0;
1157         unsigned nr_devices = 0;
1158
1159         if (!out->nr_tabstops)
1160                 printbuf_tabstop_push(out, 44);
1161
1162         for (int i = 0; i < sb->nr_devices; i++)
1163                 nr_devices += bch2_dev_exists(sb, i);
1164
1165         prt_printf(out, "External UUID:");
1166         prt_tab(out);
1167         pr_uuid(out, sb->user_uuid.b);
1168         prt_newline(out);
1169
1170         prt_printf(out, "Internal UUID:");
1171         prt_tab(out);
1172         pr_uuid(out, sb->uuid.b);
1173         prt_newline(out);
1174
1175         prt_str(out, "Device index:");
1176         prt_tab(out);
1177         prt_printf(out, "%u", sb->dev_idx);
1178         prt_newline(out);
1179
1180         prt_str(out, "Label:");
1181         prt_tab(out);
1182         prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1183         prt_newline(out);
1184
1185         prt_str(out, "Version:");
1186         prt_tab(out);
1187         bch2_version_to_text(out, le16_to_cpu(sb->version));
1188         prt_newline(out);
1189
1190         prt_str(out, "Version upgrade complete:");
1191         prt_tab(out);
1192         bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
1193         prt_newline(out);
1194
1195         prt_printf(out, "Oldest version on disk:");
1196         prt_tab(out);
1197         bch2_version_to_text(out, le16_to_cpu(sb->version_min));
1198         prt_newline(out);
1199
1200         prt_printf(out, "Created:");
1201         prt_tab(out);
1202         if (sb->time_base_lo)
1203                 bch2_prt_datetime(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1204         else
1205                 prt_printf(out, "(not set)");
1206         prt_newline(out);
1207
1208         prt_printf(out, "Sequence number:");
1209         prt_tab(out);
1210         prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1211         prt_newline(out);
1212
1213         prt_printf(out, "Superblock size:");
1214         prt_tab(out);
1215         prt_printf(out, "%zu", vstruct_bytes(sb));
1216         prt_newline(out);
1217
1218         prt_printf(out, "Clean:");
1219         prt_tab(out);
1220         prt_printf(out, "%llu", BCH_SB_CLEAN(sb));
1221         prt_newline(out);
1222
1223         prt_printf(out, "Devices:");
1224         prt_tab(out);
1225         prt_printf(out, "%u", nr_devices);
1226         prt_newline(out);
1227
1228         prt_printf(out, "Sections:");
1229         vstruct_for_each(sb, f)
1230                 fields_have |= 1 << le32_to_cpu(f->type);
1231         prt_tab(out);
1232         prt_bitflags(out, bch2_sb_fields, fields_have);
1233         prt_newline(out);
1234
1235         prt_printf(out, "Features:");
1236         prt_tab(out);
1237         prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1238         prt_newline(out);
1239
1240         prt_printf(out, "Compat features:");
1241         prt_tab(out);
1242         prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1243         prt_newline(out);
1244
1245         prt_newline(out);
1246         prt_printf(out, "Options:");
1247         prt_newline(out);
1248         printbuf_indent_add(out, 2);
1249         {
1250                 enum bch_opt_id id;
1251
1252                 for (id = 0; id < bch2_opts_nr; id++) {
1253                         const struct bch_option *opt = bch2_opt_table + id;
1254
1255                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1256                                 u64 v = bch2_opt_from_sb(sb, id);
1257
1258                                 prt_printf(out, "%s:", opt->attr.name);
1259                                 prt_tab(out);
1260                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1261                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1262                                 prt_newline(out);
1263                         }
1264                 }
1265         }
1266
1267         printbuf_indent_sub(out, 2);
1268
1269         if (print_layout) {
1270                 prt_newline(out);
1271                 prt_printf(out, "layout:");
1272                 prt_newline(out);
1273                 printbuf_indent_add(out, 2);
1274                 bch2_sb_layout_to_text(out, &sb->layout);
1275                 printbuf_indent_sub(out, 2);
1276         }
1277
1278         vstruct_for_each(sb, f)
1279                 if (fields & (1 << le32_to_cpu(f->type))) {
1280                         prt_newline(out);
1281                         bch2_sb_field_to_text(out, sb, f);
1282                 }
1283 }