fs/bcachefs/super-io.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "checksum.h"
   5 #include "disk_groups.h"
   6 #include "ec.h"
   7 #include "error.h"
   8 #include "journal.h"
   9 #include "journal_sb.h"
  10 #include "journal_seq_blacklist.h"
  11 #include "recovery_passes.h"
  12 #include "replicas.h"
  13 #include "quota.h"
  14 #include "sb-clean.h"
  15 #include "sb-counters.h"
  16 #include "sb-downgrade.h"
  17 #include "sb-errors.h"
  18 #include "sb-members.h"
  19 #include "super-io.h"
  20 #include "super.h"
  21 #include "trace.h"
  22 #include "vstructs.h"
  23
  24 #include <linux/backing-dev.h>
  25 #include <linux/sort.h>
  26
  27 static const struct blk_holder_ops bch2_sb_handle_bdev_ops = {
  28 };
  29
  30 struct bch2_metadata_version {
  31         u16             version;
  32         const char      *name;
  33 };
  34
  35 static const struct bch2_metadata_version bch2_metadata_versions[] = {
  36 #define x(n, v) {               \
  37         .version = v,                           \
  38         .name = #n,                             \
  39 },
  40         BCH_METADATA_VERSIONS()
  41 #undef x
  42 };
  43
  44 void bch2_version_to_text(struct printbuf *out, unsigned v)
  45 {
  46         const char *str = "(unknown version)";
  47
  48         for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
  49                 if (bch2_metadata_versions[i].version == v) {
  50                         str = bch2_metadata_versions[i].name;
  51                         break;
  52                 }
  53
  54         prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str);
  55 }
  56
  57 unsigned bch2_latest_compatible_version(unsigned v)
  58 {
  59         if (!BCH_VERSION_MAJOR(v))
  60                 return v;
  61
  62         for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
  63                 if (bch2_metadata_versions[i].version > v &&
  64                     BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) ==
  65                     BCH_VERSION_MAJOR(v))
  66                         v = bch2_metadata_versions[i].version;
  67
  68         return v;
  69 }
  70
  71 const char * const bch2_sb_fields[] = {
  72 #define x(name, nr)     #name,
  73         BCH_SB_FIELDS()
  74 #undef x
  75         NULL
  76 };
  77
  78 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
  79                                   struct printbuf *);
  80
  81 struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb,
  82                                       enum bch_sb_field_type type)
  83 {
  84         /* XXX: need locking around superblock to access optional fields */
  85
  86         vstruct_for_each(sb, f)
  87                 if (le32_to_cpu(f->type) == type)
  88                         return f;
  89         return NULL;
  90 }
  91
  92 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
  93                                                    struct bch_sb_field *f,
  94                                                    unsigned u64s)
  95 {
  96         unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
  97         unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
  98
  99         BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
 100
 101         if (!f && !u64s) {
 102                 /* nothing to do: */
 103         } else if (!f) {
 104                 f = vstruct_last(sb->sb);
 105                 memset(f, 0, sizeof(u64) * u64s);
 106                 f->u64s = cpu_to_le32(u64s);
 107                 f->type = 0;
 108         } else {
 109                 void *src, *dst;
 110
 111                 src = vstruct_end(f);
 112
 113                 if (u64s) {
 114                         f->u64s = cpu_to_le32(u64s);
 115                         dst = vstruct_end(f);
 116                 } else {
 117                         dst = f;
 118                 }
 119
 120                 memmove(dst, src, vstruct_end(sb->sb) - src);
 121
 122                 if (dst > src)
 123                         memset(src, 0, dst - src);
 124         }
 125
 126         sb->sb->u64s = cpu_to_le32(sb_u64s);
 127
 128         return u64s ? f : NULL;
 129 }
 130
 131 void bch2_sb_field_delete(struct bch_sb_handle *sb,
 132                           enum bch_sb_field_type type)
 133 {
 134         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 135
 136         if (f)
 137                 __bch2_sb_field_resize(sb, f, 0);
 138 }
 139
 140 /* Superblock realloc/free: */
 141
 142 void bch2_free_super(struct bch_sb_handle *sb)
 143 {
 144         kfree(sb->bio);
 145         if (!IS_ERR_OR_NULL(sb->s_bdev_file))
 146                 bdev_fput(sb->s_bdev_file);
 147         kfree(sb->holder);
 148         kfree(sb->sb_name);
 149
 150         kfree(sb->sb);
 151         memset(sb, 0, sizeof(*sb));
 152 }
 153
 154 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 155 {
 156         size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
 157         size_t new_buffer_size;
 158         struct bch_sb *new_sb;
 159         struct bio *bio;
 160
 161         if (sb->bdev)
 162                 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
 163
 164         new_buffer_size = roundup_pow_of_two(new_bytes);
 165
 166         if (sb->sb && sb->buffer_size >= new_buffer_size)
 167                 return 0;
 168
 169         if (sb->sb && sb->have_layout) {
 170                 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
 171
 172                 if (new_bytes > max_bytes) {
 173                         struct printbuf buf = PRINTBUF;
 174
 175                         prt_bdevname(&buf, sb->bdev);
 176                         prt_printf(&buf, ": superblock too big: want %zu but have %llu", new_bytes, max_bytes);
 177                         pr_err("%s", buf.buf);
 178                         printbuf_exit(&buf);
 179                         return -BCH_ERR_ENOSPC_sb;
 180                 }
 181         }
 182
 183         if (sb->buffer_size >= new_buffer_size && sb->sb)
 184                 return 0;
 185
 186         if (dynamic_fault("bcachefs:add:super_realloc"))
 187                 return -BCH_ERR_ENOMEM_sb_realloc_injected;
 188
 189         new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
 190         if (!new_sb)
 191                 return -BCH_ERR_ENOMEM_sb_buf_realloc;
 192
 193         sb->sb = new_sb;
 194
 195         if (sb->have_bio) {
 196                 unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size);
 197
 198                 bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
 199                 if (!bio)
 200                         return -BCH_ERR_ENOMEM_sb_bio_realloc;
 201
 202                 bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
 203
 204                 kfree(sb->bio);
 205                 sb->bio = bio;
 206         }
 207
 208         sb->buffer_size = new_buffer_size;
 209
 210         return 0;
 211 }
 212
 213 struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb,
 214                                           enum bch_sb_field_type type,
 215                                           unsigned u64s)
 216 {
 217         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 218         ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 219         ssize_t d = -old_u64s + u64s;
 220
 221         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
 222                 return NULL;
 223
 224         if (sb->fs_sb) {
 225                 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
 226
 227                 lockdep_assert_held(&c->sb_lock);
 228
 229                 /* XXX: we're not checking that offline device have enough space */
 230
 231                 for_each_online_member(c, ca) {
 232                         struct bch_sb_handle *dev_sb = &ca->disk_sb;
 233
 234                         if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
 235                                 percpu_ref_put(&ca->io_ref);
 236                                 return NULL;
 237                         }
 238                 }
 239         }
 240
 241         f = bch2_sb_field_get_id(sb->sb, type);
 242         f = __bch2_sb_field_resize(sb, f, u64s);
 243         if (f)
 244                 f->type = cpu_to_le32(type);
 245         return f;
 246 }
 247
 248 struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *sb,
 249                                                   enum bch_sb_field_type type,
 250                                                   unsigned u64s)
 251 {
 252         struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 253
 254         if (!f || le32_to_cpu(f->u64s) < u64s)
 255                 f = bch2_sb_field_resize_id(sb, type, u64s);
 256         return f;
 257 }
 258
 259 /* Superblock validate: */
 260
 261 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
 262 {
 263         u64 offset, prev_offset, max_sectors;
 264         unsigned i;
 265
 266         BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
 267
 268         if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
 269             !uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
 270                 prt_printf(out, "Not a bcachefs superblock layout");
 271                 return -BCH_ERR_invalid_sb_layout;
 272         }
 273
 274         if (layout->layout_type != 0) {
 275                 prt_printf(out, "Invalid superblock layout type %u",
 276                        layout->layout_type);
 277                 return -BCH_ERR_invalid_sb_layout_type;
 278         }
 279
 280         if (!layout->nr_superblocks) {
 281                 prt_printf(out, "Invalid superblock layout: no superblocks");
 282                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 283         }
 284
 285         if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
 286                 prt_printf(out, "Invalid superblock layout: too many superblocks");
 287                 return -BCH_ERR_invalid_sb_layout_nr_superblocks;
 288         }
 289
 290         max_sectors = 1 << layout->sb_max_size_bits;
 291
 292         prev_offset = le64_to_cpu(layout->sb_offset[0]);
 293
 294         for (i = 1; i < layout->nr_superblocks; i++) {
 295                 offset = le64_to_cpu(layout->sb_offset[i]);
 296
 297                 if (offset < prev_offset + max_sectors) {
 298                         prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
 299                                "  (sb %u ends at %llu next starts at %llu",
 300                                i - 1, prev_offset + max_sectors, offset);
 301                         return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
 302                 }
 303                 prev_offset = offset;
 304         }
 305
 306         return 0;
 307 }
 308
 309 static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out)
 310 {
 311         u16 version             = le16_to_cpu(sb->version);
 312         u16 version_min         = le16_to_cpu(sb->version_min);
 313
 314         if (!bch2_version_compatible(version)) {
 315                 prt_str(out, "Unsupported superblock version ");
 316                 bch2_version_to_text(out, version);
 317                 prt_str(out, " (min ");
 318                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 319                 prt_str(out, ", max ");
 320                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 321                 prt_str(out, ")");
 322                 return -BCH_ERR_invalid_sb_version;
 323         }
 324
 325         if (!bch2_version_compatible(version_min)) {
 326                 prt_str(out, "Unsupported superblock version_min ");
 327                 bch2_version_to_text(out, version_min);
 328                 prt_str(out, " (min ");
 329                 bch2_version_to_text(out, bcachefs_metadata_version_min);
 330                 prt_str(out, ", max ");
 331                 bch2_version_to_text(out, bcachefs_metadata_version_current);
 332                 prt_str(out, ")");
 333                 return -BCH_ERR_invalid_sb_version;
 334         }
 335
 336         if (version_min > version) {
 337                 prt_str(out, "Bad minimum version ");
 338                 bch2_version_to_text(out, version_min);
 339                 prt_str(out, ", greater than version field ");
 340                 bch2_version_to_text(out, version);
 341                 return -BCH_ERR_invalid_sb_version;
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 348                             int rw)
 349 {
 350         struct bch_sb *sb = disk_sb->sb;
 351         struct bch_sb_field_members_v1 *mi;
 352         enum bch_opt_id opt_id;
 353         u16 block_size;
 354         int ret;
 355
 356         ret = bch2_sb_compatible(sb, out);
 357         if (ret)
 358                 return ret;
 359
 360         if (sb->features[1] ||
 361             (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
 362                 prt_printf(out, "Filesystem has incompatible features");
 363                 return -BCH_ERR_invalid_sb_features;
 364         }
 365
 366         block_size = le16_to_cpu(sb->block_size);
 367
 368         if (block_size > PAGE_SECTORS) {
 369                 prt_printf(out, "Block size too big (got %u, max %u)",
 370                        block_size, PAGE_SECTORS);
 371                 return -BCH_ERR_invalid_sb_block_size;
 372         }
 373
 374         if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
 375                 prt_printf(out, "Bad user UUID (got zeroes)");
 376                 return -BCH_ERR_invalid_sb_uuid;
 377         }
 378
 379         if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
 380                 prt_printf(out, "Bad internal UUID (got zeroes)");
 381                 return -BCH_ERR_invalid_sb_uuid;
 382         }
 383
 384         if (!sb->nr_devices ||
 385             sb->nr_devices > BCH_SB_MEMBERS_MAX) {
 386                 prt_printf(out, "Bad number of member devices %u (max %u)",
 387                        sb->nr_devices, BCH_SB_MEMBERS_MAX);
 388                 return -BCH_ERR_invalid_sb_too_many_members;
 389         }
 390
 391         if (sb->dev_idx >= sb->nr_devices) {
 392                 prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
 393                        sb->dev_idx, sb->nr_devices);
 394                 return -BCH_ERR_invalid_sb_dev_idx;
 395         }
 396
 397         if (!sb->time_precision ||
 398             le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
 399                 prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
 400                        le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
 401                 return -BCH_ERR_invalid_sb_time_precision;
 402         }
 403
 404         if (rw == READ) {
 405                 /*
 406                  * Been seeing a bug where these are getting inexplicably
 407                  * zeroed, so we're now validating them, but we have to be
 408                  * careful not to preven people's filesystems from mounting:
 409                  */
 410                 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
 411                         SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 412                 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 413                         SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
 414
 415                 if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb))
 416                         SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version));
 417         }
 418
 419         for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
 420                 const struct bch_option *opt = bch2_opt_table + opt_id;
 421
 422                 if (opt->get_sb != BCH2_NO_SB_OPT) {
 423                         u64 v = bch2_opt_from_sb(sb, opt_id);
 424
 425                         prt_printf(out, "Invalid option ");
 426                         ret = bch2_opt_validate(opt, v, out);
 427                         if (ret)
 428                                 return ret;
 429
 430                         printbuf_reset(out);
 431                 }
 432         }
 433
 434         /* validate layout */
 435         ret = validate_sb_layout(&sb->layout, out);
 436         if (ret)
 437                 return ret;
 438
 439         vstruct_for_each(sb, f) {
 440                 if (!f->u64s) {
 441                         prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
 442                                le32_to_cpu(f->type));
 443                         return -BCH_ERR_invalid_sb_field_size;
 444                 }
 445
 446                 if (vstruct_next(f) > vstruct_last(sb)) {
 447                         prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
 448                                le32_to_cpu(f->type));
 449                         return -BCH_ERR_invalid_sb_field_size;
 450                 }
 451         }
 452
 453         /* members must be validated first: */
 454         mi = bch2_sb_field_get(sb, members_v1);
 455         if (!mi) {
 456                 prt_printf(out, "Invalid superblock: member info area missing");
 457                 return -BCH_ERR_invalid_sb_members_missing;
 458         }
 459
 460         ret = bch2_sb_field_validate(sb, &mi->field, out);
 461         if (ret)
 462                 return ret;
 463
 464         vstruct_for_each(sb, f) {
 465                 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1)
 466                         continue;
 467
 468                 ret = bch2_sb_field_validate(sb, f, out);
 469                 if (ret)
 470                         return ret;
 471         }
 472
 473         if (rw == WRITE &&
 474             bch2_sb_member_get(sb, sb->dev_idx).seq != sb->seq) {
 475                 prt_printf(out, "Invalid superblock: member seq %llu != sb seq %llu",
 476                            le64_to_cpu(bch2_sb_member_get(sb, sb->dev_idx).seq),
 477                            le64_to_cpu(sb->seq));
 478                 return -BCH_ERR_invalid_sb_members_missing;
 479         }
 480
 481         return 0;
 482 }
 483
 484 /* device open: */
 485
 486 static unsigned long le_ulong_to_cpu(unsigned long v)
 487 {
 488         return sizeof(unsigned long) == 8
 489                 ? le64_to_cpu(v)
 490                 : le32_to_cpu(v);
 491 }
 492
 493 static void le_bitvector_to_cpu(unsigned long *dst, unsigned long *src, unsigned nr)
 494 {
 495         BUG_ON(nr & (BITS_PER_TYPE(long) - 1));
 496
 497         for (unsigned i = 0; i < BITS_TO_LONGS(nr); i++)
 498                 dst[i] = le_ulong_to_cpu(src[i]);
 499 }
 500
 501 static void bch2_sb_update(struct bch_fs *c)
 502 {
 503         struct bch_sb *src = c->disk_sb.sb;
 504
 505         lockdep_assert_held(&c->sb_lock);
 506
 507         c->sb.uuid              = src->uuid;
 508         c->sb.user_uuid         = src->user_uuid;
 509         c->sb.version           = le16_to_cpu(src->version);
 510         c->sb.version_min       = le16_to_cpu(src->version_min);
 511         c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
 512         c->sb.nr_devices        = src->nr_devices;
 513         c->sb.clean             = BCH_SB_CLEAN(src);
 514         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
 515
 516         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 517         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
 518
 519         /* XXX this is wrong, we need a 96 or 128 bit integer type */
 520         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
 521                                           c->sb.nsec_per_time_unit);
 522         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
 523
 524         c->sb.features          = le64_to_cpu(src->features[0]);
 525         c->sb.compat            = le64_to_cpu(src->compat[0]);
 526
 527         memset(c->sb.errors_silent, 0, sizeof(c->sb.errors_silent));
 528
 529         struct bch_sb_field_ext *ext = bch2_sb_field_get(src, ext);
 530         if (ext) {
 531                 le_bitvector_to_cpu(c->sb.errors_silent, (void *) ext->errors_silent,
 532                                     sizeof(c->sb.errors_silent) * 8);
 533                 c->sb.btrees_lost_data = le64_to_cpu(ext->btrees_lost_data);
 534         }
 535
 536         for_each_member_device(c, ca) {
 537                 struct bch_member m = bch2_sb_member_get(src, ca->dev_idx);
 538                 ca->mi = bch2_mi_to_cpu(&m);
 539         }
 540 }
 541
 542 static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
 543 {
 544         struct bch_sb_field *src_f, *dst_f;
 545         struct bch_sb *dst = dst_handle->sb;
 546         unsigned i;
 547
 548         dst->version            = src->version;
 549         dst->version_min        = src->version_min;
 550         dst->seq                = src->seq;
 551         dst->uuid               = src->uuid;
 552         dst->user_uuid          = src->user_uuid;
 553         memcpy(dst->label,      src->label, sizeof(dst->label));
 554
 555         dst->block_size         = src->block_size;
 556         dst->nr_devices         = src->nr_devices;
 557
 558         dst->time_base_lo       = src->time_base_lo;
 559         dst->time_base_hi       = src->time_base_hi;
 560         dst->time_precision     = src->time_precision;
 561         dst->write_time         = src->write_time;
 562
 563         memcpy(dst->flags,      src->flags,     sizeof(dst->flags));
 564         memcpy(dst->features,   src->features,  sizeof(dst->features));
 565         memcpy(dst->compat,     src->compat,    sizeof(dst->compat));
 566
 567         for (i = 0; i < BCH_SB_FIELD_NR; i++) {
 568                 int d;
 569
 570                 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
 571                         continue;
 572
 573                 src_f = bch2_sb_field_get_id(src, i);
 574                 dst_f = bch2_sb_field_get_id(dst, i);
 575
 576                 d = (src_f ? le32_to_cpu(src_f->u64s) : 0) -
 577                     (dst_f ? le32_to_cpu(dst_f->u64s) : 0);
 578                 if (d > 0) {
 579                         int ret = bch2_sb_realloc(dst_handle,
 580                                         le32_to_cpu(dst_handle->sb->u64s) + d);
 581
 582                         if (ret)
 583                                 return ret;
 584
 585                         dst = dst_handle->sb;
 586                         dst_f = bch2_sb_field_get_id(dst, i);
 587                 }
 588
 589                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
 590                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
 591
 592                 if (src_f)
 593                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
 594         }
 595
 596         return 0;
 597 }
 598
 599 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
 600 {
 601         int ret;
 602
 603         lockdep_assert_held(&c->sb_lock);
 604
 605         ret =   bch2_sb_realloc(&c->disk_sb, 0) ?:
 606                 __copy_super(&c->disk_sb, src) ?:
 607                 bch2_sb_replicas_to_cpu_replicas(c) ?:
 608                 bch2_sb_disk_groups_to_cpu(c);
 609         if (ret)
 610                 return ret;
 611
 612         bch2_sb_update(c);
 613         return 0;
 614 }
 615
 616 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
 617 {
 618         return __copy_super(&ca->disk_sb, c->disk_sb.sb);
 619 }
 620
 621 /* read superblock: */
 622
 623 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
 624 {
 625         size_t bytes;
 626         int ret;
 627 reread:
 628         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 629         sb->bio->bi_iter.bi_sector = offset;
 630         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
 631
 632         ret = submit_bio_wait(sb->bio);
 633         if (ret) {
 634                 prt_printf(err, "IO error: %i", ret);
 635                 return ret;
 636         }
 637
 638         if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
 639             !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
 640                 prt_str(err, "Not a bcachefs superblock (got magic ");
 641                 pr_uuid(err, sb->sb->magic.b);
 642                 prt_str(err, ")");
 643                 return -BCH_ERR_invalid_sb_magic;
 644         }
 645
 646         ret = bch2_sb_compatible(sb->sb, err);
 647         if (ret)
 648                 return ret;
 649
 650         bytes = vstruct_bytes(sb->sb);
 651
 652         if (bytes > 512ULL << min(BCH_SB_LAYOUT_SIZE_BITS_MAX, sb->sb->layout.sb_max_size_bits)) {
 653                 prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
 654                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
 655                 return -BCH_ERR_invalid_sb_too_big;
 656         }
 657
 658         if (bytes > sb->buffer_size) {
 659                 ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
 660                 if (ret)
 661                         return ret;
 662                 goto reread;
 663         }
 664
 665         enum bch_csum_type csum_type = BCH_SB_CSUM_TYPE(sb->sb);
 666         if (csum_type >= BCH_CSUM_NR) {
 667                 prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
 668                 return -BCH_ERR_invalid_sb_csum_type;
 669         }
 670
 671         /* XXX: verify MACs */
 672         struct bch_csum csum = csum_vstruct(NULL, csum_type, null_nonce(), sb->sb);
 673         if (bch2_crc_cmp(csum, sb->sb->csum)) {
 674                 bch2_csum_err_msg(err, csum_type, sb->sb->csum, csum);
 675                 return -BCH_ERR_invalid_sb_csum;
 676         }
 677
 678         sb->seq = le64_to_cpu(sb->sb->seq);
 679
 680         return 0;
 681 }
 682
 683 static int __bch2_read_super(const char *path, struct bch_opts *opts,
 684                     struct bch_sb_handle *sb, bool ignore_notbchfs_msg)
 685 {
 686         u64 offset = opt_get(*opts, sb);
 687         struct bch_sb_layout layout;
 688         struct printbuf err = PRINTBUF;
 689         struct printbuf err2 = PRINTBUF;
 690         __le64 *i;
 691         int ret;
 692 #ifndef __KERNEL__
 693 retry:
 694 #endif
 695         memset(sb, 0, sizeof(*sb));
 696         sb->mode        = BLK_OPEN_READ;
 697         sb->have_bio    = true;
 698         sb->holder      = kmalloc(1, GFP_KERNEL);
 699         if (!sb->holder)
 700                 return -ENOMEM;
 701
 702         sb->sb_name = kstrdup(path, GFP_KERNEL);
 703         if (!sb->sb_name) {
 704                 ret = -ENOMEM;
 705                 prt_printf(&err, "error allocating memory for sb_name");
 706                 goto err;
 707         }
 708
 709 #ifndef __KERNEL__
 710         if (opt_get(*opts, direct_io) == false)
 711                 sb->mode |= BLK_OPEN_BUFFERED;
 712 #endif
 713
 714         if (!opt_get(*opts, noexcl))
 715                 sb->mode |= BLK_OPEN_EXCL;
 716
 717         if (!opt_get(*opts, nochanges))
 718                 sb->mode |= BLK_OPEN_WRITE;
 719
 720         sb->s_bdev_file = bdev_file_open_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 721         if (IS_ERR(sb->s_bdev_file) &&
 722             PTR_ERR(sb->s_bdev_file) == -EACCES &&
 723             opt_get(*opts, read_only)) {
 724                 sb->mode &= ~BLK_OPEN_WRITE;
 725
 726                 sb->s_bdev_file = bdev_file_open_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 727                 if (!IS_ERR(sb->s_bdev_file))
 728                         opt_set(*opts, nochanges, true);
 729         }
 730
 731         if (IS_ERR(sb->s_bdev_file)) {
 732                 ret = PTR_ERR(sb->s_bdev_file);
 733                 prt_printf(&err, "error opening %s: %s", path, bch2_err_str(ret));
 734                 goto err;
 735         }
 736         sb->bdev = file_bdev(sb->s_bdev_file);
 737
 738         ret = bch2_sb_realloc(sb, 0);
 739         if (ret) {
 740                 prt_printf(&err, "error allocating memory for superblock");
 741                 goto err;
 742         }
 743
 744         if (bch2_fs_init_fault("read_super")) {
 745                 prt_printf(&err, "dynamic fault");
 746                 ret = -EFAULT;
 747                 goto err;
 748         }
 749
 750         ret = read_one_super(sb, offset, &err);
 751         if (!ret)
 752                 goto got_super;
 753
 754         if (opt_defined(*opts, sb))
 755                 goto err;
 756
 757         prt_printf(&err2, "bcachefs (%s): error reading default superblock: %s\n",
 758                path, err.buf);
 759         if (ret == -BCH_ERR_invalid_sb_magic && ignore_notbchfs_msg)
 760                 bch2_print_opts(opts, KERN_INFO "%s", err2.buf);
 761         else
 762                 bch2_print_opts(opts, KERN_ERR "%s", err2.buf);
 763
 764         printbuf_exit(&err2);
 765         printbuf_reset(&err);
 766
 767         /*
 768          * Error reading primary superblock - read location of backup
 769          * superblocks:
 770          */
 771         bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 772         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
 773         /*
 774          * use sb buffer to read layout, since sb buffer is page aligned but
 775          * layout won't be:
 776          */
 777         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
 778
 779         ret = submit_bio_wait(sb->bio);
 780         if (ret) {
 781                 prt_printf(&err, "IO error: %i", ret);
 782                 goto err;
 783         }
 784
 785         memcpy(&layout, sb->sb, sizeof(layout));
 786         ret = validate_sb_layout(&layout, &err);
 787         if (ret)
 788                 goto err;
 789
 790         for (i = layout.sb_offset;
 791              i < layout.sb_offset + layout.nr_superblocks; i++) {
 792                 offset = le64_to_cpu(*i);
 793
 794                 if (offset == opt_get(*opts, sb))
 795                         continue;
 796
 797                 ret = read_one_super(sb, offset, &err);
 798                 if (!ret)
 799                         goto got_super;
 800         }
 801
 802         goto err;
 803
 804 got_super:
 805         if (le16_to_cpu(sb->sb->block_size) << 9 <
 806             bdev_logical_block_size(sb->bdev) &&
 807             opt_get(*opts, direct_io)) {
 808 #ifndef __KERNEL__
 809                 opt_set(*opts, direct_io, false);
 810                 bch2_free_super(sb);
 811                 goto retry;
 812 #endif
 813                 prt_printf(&err, "block size (%u) smaller than device block size (%u)",
 814                        le16_to_cpu(sb->sb->block_size) << 9,
 815                        bdev_logical_block_size(sb->bdev));
 816                 ret = -BCH_ERR_block_size_too_small;
 817                 goto err;
 818         }
 819
 820         sb->have_layout = true;
 821
 822         ret = bch2_sb_validate(sb, &err, READ);
 823         if (ret) {
 824                 bch2_print_opts(opts, KERN_ERR "bcachefs (%s): error validating superblock: %s\n",
 825                                 path, err.buf);
 826                 goto err_no_print;
 827         }
 828 out:
 829         printbuf_exit(&err);
 830         return ret;
 831 err:
 832         bch2_print_opts(opts, KERN_ERR "bcachefs (%s): error reading superblock: %s\n",
 833                         path, err.buf);
 834 err_no_print:
 835         bch2_free_super(sb);
 836         goto out;
 837 }
 838
 839 int bch2_read_super(const char *path, struct bch_opts *opts,
 840                     struct bch_sb_handle *sb)
 841 {
 842         return __bch2_read_super(path, opts, sb, false);
 843 }
 844
 845 /* provide a silenced version for mount.bcachefs */
 846
 847 int bch2_read_super_silent(const char *path, struct bch_opts *opts,
 848                     struct bch_sb_handle *sb)
 849 {
 850         return __bch2_read_super(path, opts, sb, true);
 851 }
 852
 853 /* write superblock: */
 854
 855 static void write_super_endio(struct bio *bio)
 856 {
 857         struct bch_dev *ca = bio->bi_private;
 858
 859         /* XXX: return errors directly */
 860
 861         if (bch2_dev_io_err_on(bio->bi_status, ca,
 862                                bio_data_dir(bio)
 863                                ? BCH_MEMBER_ERROR_write
 864                                : BCH_MEMBER_ERROR_read,
 865                                "superblock %s error: %s",
 866                                bio_data_dir(bio) ? "write" : "read",
 867                                bch2_blk_status_to_str(bio->bi_status)))
 868                 ca->sb_write_error = 1;
 869
 870         closure_put(&ca->fs->sb_write);
 871         percpu_ref_put(&ca->io_ref);
 872 }
 873
 874 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
 875 {
 876         struct bch_sb *sb = ca->disk_sb.sb;
 877         struct bio *bio = ca->disk_sb.bio;
 878
 879         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
 880         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
 881         bio->bi_end_io          = write_super_endio;
 882         bio->bi_private         = ca;
 883         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
 884
 885         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
 886                      bio_sectors(bio));
 887
 888         percpu_ref_get(&ca->io_ref);
 889         closure_bio_submit(bio, &c->sb_write);
 890 }
 891
 892 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
 893 {
 894         struct bch_sb *sb = ca->disk_sb.sb;
 895         struct bio *bio = ca->disk_sb.bio;
 896
 897         sb->offset = sb->layout.sb_offset[idx];
 898
 899         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
 900         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
 901                                 null_nonce(), sb);
 902
 903         bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
 904         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
 905         bio->bi_end_io          = write_super_endio;
 906         bio->bi_private         = ca;
 907         bch2_bio_map(bio, sb,
 908                      roundup((size_t) vstruct_bytes(sb),
 909                              bdev_logical_block_size(ca->disk_sb.bdev)));
 910
 911         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
 912                      bio_sectors(bio));
 913
 914         percpu_ref_get(&ca->io_ref);
 915         closure_bio_submit(bio, &c->sb_write);
 916 }
 917
 918 int bch2_write_super(struct bch_fs *c)
 919 {
 920         struct closure *cl = &c->sb_write;
 921         struct printbuf err = PRINTBUF;
 922         unsigned sb = 0, nr_wrote;
 923         struct bch_devs_mask sb_written;
 924         bool wrote, can_mount_without_written, can_mount_with_written;
 925         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
 926         DARRAY(struct bch_dev *) online_devices = {};
 927         int ret = 0;
 928
 929         trace_and_count(c, write_super, c, _RET_IP_);
 930
 931         if (c->opts.very_degraded)
 932                 degraded_flags |= BCH_FORCE_IF_LOST;
 933
 934         lockdep_assert_held(&c->sb_lock);
 935
 936         closure_init_stack(cl);
 937         memset(&sb_written, 0, sizeof(sb_written));
 938
 939         for_each_online_member(c, ca) {
 940                 ret = darray_push(&online_devices, ca);
 941                 if (bch2_fs_fatal_err_on(ret, c, "%s: error allocating online devices", __func__)) {
 942                         percpu_ref_put(&ca->io_ref);
 943                         goto out;
 944                 }
 945                 percpu_ref_get(&ca->io_ref);
 946         }
 947
 948         /* Make sure we're using the new magic numbers: */
 949         c->disk_sb.sb->magic = BCHFS_MAGIC;
 950         c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
 951
 952         le64_add_cpu(&c->disk_sb.sb->seq, 1);
 953
 954         struct bch_sb_field_members_v2 *mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
 955         darray_for_each(online_devices, ca)
 956                 __bch2_members_v2_get_mut(mi, (*ca)->dev_idx)->seq = c->disk_sb.sb->seq;
 957         c->disk_sb.sb->write_time = cpu_to_le64(ktime_get_real_seconds());
 958
 959         if (test_bit(BCH_FS_error, &c->flags))
 960                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
 961         if (test_bit(BCH_FS_topology_error, &c->flags))
 962                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 963
 964         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 965
 966         bch2_sb_counters_from_cpu(c);
 967         bch2_sb_members_from_cpu(c);
 968         bch2_sb_members_cpy_v2_v1(&c->disk_sb);
 969         bch2_sb_errors_from_cpu(c);
 970         bch2_sb_downgrade_update(c);
 971
 972         darray_for_each(online_devices, ca)
 973                 bch2_sb_from_fs(c, (*ca));
 974
 975         darray_for_each(online_devices, ca) {
 976                 printbuf_reset(&err);
 977
 978                 ret = bch2_sb_validate(&(*ca)->disk_sb, &err, WRITE);
 979                 if (ret) {
 980                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
 981                         goto out;
 982                 }
 983         }
 984
 985         if (c->opts.nochanges)
 986                 goto out;
 987
 988         /*
 989          * Defer writing the superblock until filesystem initialization is
 990          * complete - don't write out a partly initialized superblock:
 991          */
 992         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
 993                 goto out;
 994
 995         if (le16_to_cpu(c->disk_sb.sb->version) > bcachefs_metadata_version_current) {
 996                 struct printbuf buf = PRINTBUF;
 997                 prt_printf(&buf, "attempting to write superblock that wasn't version downgraded (");
 998                 bch2_version_to_text(&buf, le16_to_cpu(c->disk_sb.sb->version));
 999                 prt_str(&buf, " > ");
1000                 bch2_version_to_text(&buf, bcachefs_metadata_version_current);
1001                 prt_str(&buf, ")");
1002                 bch2_fs_fatal_error(c, ": %s", buf.buf);
1003                 printbuf_exit(&buf);
1004                 return -BCH_ERR_sb_not_downgraded;
1005         }
1006
1007         darray_for_each(online_devices, ca) {
1008                 __set_bit((*ca)->dev_idx, sb_written.d);
1009                 (*ca)->sb_write_error = 0;
1010         }
1011
1012         darray_for_each(online_devices, ca)
1013                 read_back_super(c, *ca);
1014         closure_sync(cl);
1015
1016         darray_for_each(online_devices, cap) {
1017                 struct bch_dev *ca = *cap;
1018
1019                 if (ca->sb_write_error)
1020                         continue;
1021
1022                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
1023                         bch2_fs_fatal_error(c,
1024                                 ": Superblock write was silently dropped! (seq %llu expected %llu)",
1025                                 le64_to_cpu(ca->sb_read_scratch->seq),
1026                                 ca->disk_sb.seq);
1027                         percpu_ref_put(&ca->io_ref);
1028                         ret = -BCH_ERR_erofs_sb_err;
1029                         goto out;
1030                 }
1031
1032                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
1033                         bch2_fs_fatal_error(c,
1034                                 ": Superblock modified by another process (seq %llu expected %llu)",
1035                                 le64_to_cpu(ca->sb_read_scratch->seq),
1036                                 ca->disk_sb.seq);
1037                         percpu_ref_put(&ca->io_ref);
1038                         ret = -BCH_ERR_erofs_sb_err;
1039                         goto out;
1040                 }
1041         }
1042
1043         do {
1044                 wrote = false;
1045                 darray_for_each(online_devices, cap) {
1046                         struct bch_dev *ca = *cap;
1047                         if (!ca->sb_write_error &&
1048                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
1049                                 write_one_super(c, ca, sb);
1050                                 wrote = true;
1051                         }
1052                 }
1053                 closure_sync(cl);
1054                 sb++;
1055         } while (wrote);
1056
1057         darray_for_each(online_devices, cap) {
1058                 struct bch_dev *ca = *cap;
1059                 if (ca->sb_write_error)
1060                         __clear_bit(ca->dev_idx, sb_written.d);
1061                 else
1062                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
1063         }
1064
1065         nr_wrote = dev_mask_nr(&sb_written);
1066
1067         can_mount_with_written =
1068                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
1069
1070         for (unsigned i = 0; i < ARRAY_SIZE(sb_written.d); i++)
1071                 sb_written.d[i] = ~sb_written.d[i];
1072
1073         can_mount_without_written =
1074                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
1075
1076         /*
1077          * If we would be able to mount _without_ the devices we successfully
1078          * wrote superblocks to, we weren't able to write to enough devices:
1079          *
1080          * Exception: if we can mount without the successes because we haven't
1081          * written anything (new filesystem), we continue if we'd be able to
1082          * mount with the devices we did successfully write to:
1083          */
1084         if (bch2_fs_fatal_err_on(!nr_wrote ||
1085                                  !can_mount_with_written ||
1086                                  (can_mount_without_written &&
1087                                   !can_mount_with_written), c,
1088                 ": Unable to write superblock to sufficient devices (from %ps)",
1089                 (void *) _RET_IP_))
1090                 ret = -1;
1091 out:
1092         /* Make new options visible after they're persistent: */
1093         bch2_sb_update(c);
1094         darray_for_each(online_devices, ca)
1095                 percpu_ref_put(&(*ca)->io_ref);
1096         darray_exit(&online_devices);
1097         printbuf_exit(&err);
1098         return ret;
1099 }
1100
1101 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
1102 {
1103         mutex_lock(&c->sb_lock);
1104         if (!(c->sb.features & (1ULL << feat))) {
1105                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
1106
1107                 bch2_write_super(c);
1108         }
1109         mutex_unlock(&c->sb_lock);
1110 }
1111
1112 /* Downgrade if superblock is at a higher version than currently supported: */
1113 bool bch2_check_version_downgrade(struct bch_fs *c)
1114 {
1115         bool ret = bcachefs_metadata_version_current < c->sb.version;
1116
1117         lockdep_assert_held(&c->sb_lock);
1118
1119         /*
1120          * Downgrade, if superblock is at a higher version than currently
1121          * supported:
1122          *
1123          * c->sb will be checked before we write the superblock, so update it as
1124          * well:
1125          */
1126         if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current) {
1127                 SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
1128                 c->sb.version_upgrade_complete = bcachefs_metadata_version_current;
1129         }
1130         if (c->sb.version > bcachefs_metadata_version_current) {
1131                 c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
1132                 c->sb.version = bcachefs_metadata_version_current;
1133         }
1134         if (c->sb.version_min > bcachefs_metadata_version_current) {
1135                 c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
1136                 c->sb.version_min = bcachefs_metadata_version_current;
1137         }
1138         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1139         return ret;
1140 }
1141
1142 void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
1143 {
1144         lockdep_assert_held(&c->sb_lock);
1145
1146         if (BCH_VERSION_MAJOR(new_version) >
1147             BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version)))
1148                 bch2_sb_field_resize(&c->disk_sb, downgrade, 0);
1149
1150         c->disk_sb.sb->version = cpu_to_le16(new_version);
1151         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
1152 }
1153
1154 static int bch2_sb_ext_validate(struct bch_sb *sb, struct bch_sb_field *f,
1155                                 struct printbuf *err)
1156 {
1157         if (vstruct_bytes(f) < 88) {
1158                 prt_printf(err, "field too small (%zu < %u)", vstruct_bytes(f), 88);
1159                 return -BCH_ERR_invalid_sb_ext;
1160         }
1161
1162         return 0;
1163 }
1164
1165 static void bch2_sb_ext_to_text(struct printbuf *out, struct bch_sb *sb,
1166                                 struct bch_sb_field *f)
1167 {
1168         struct bch_sb_field_ext *e = field_to_type(f, ext);
1169
1170         prt_printf(out, "Recovery passes required:");
1171         prt_tab(out);
1172         prt_bitflags(out, bch2_recovery_passes,
1173                      bch2_recovery_passes_from_stable(le64_to_cpu(e->recovery_passes_required[0])));
1174         prt_newline(out);
1175
1176         unsigned long *errors_silent = kmalloc(sizeof(e->errors_silent), GFP_KERNEL);
1177         if (errors_silent) {
1178                 le_bitvector_to_cpu(errors_silent, (void *) e->errors_silent, sizeof(e->errors_silent) * 8);
1179
1180                 prt_printf(out, "Errors to silently fix:");
1181                 prt_tab(out);
1182                 prt_bitflags_vector(out, bch2_sb_error_strs, errors_silent, sizeof(e->errors_silent) * 8);
1183                 prt_newline(out);
1184
1185                 kfree(errors_silent);
1186         }
1187
1188         prt_printf(out, "Btrees with missing data:");
1189         prt_tab(out);
1190         prt_bitflags(out, __bch2_btree_ids, le64_to_cpu(e->btrees_lost_data));
1191         prt_newline(out);
1192 }
1193
1194 static const struct bch_sb_field_ops bch_sb_field_ops_ext = {
1195         .validate       = bch2_sb_ext_validate,
1196         .to_text        = bch2_sb_ext_to_text,
1197 };
1198
1199 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1200 #define x(f, nr)                                        \
1201         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1202         BCH_SB_FIELDS()
1203 #undef x
1204 };
1205
1206 static const struct bch_sb_field_ops bch2_sb_field_null_ops;
1207
1208 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
1209 {
1210         return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
1211                 ? bch2_sb_field_ops[type]
1212                 : &bch2_sb_field_null_ops;
1213 }
1214
1215 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1216                                   struct printbuf *err)
1217 {
1218         unsigned type = le32_to_cpu(f->type);
1219         struct printbuf field_err = PRINTBUF;
1220         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1221         int ret;
1222
1223         ret = ops->validate ? ops->validate(sb, f, &field_err) : 0;
1224         if (ret) {
1225                 prt_printf(err, "Invalid superblock section %s: %s",
1226                            bch2_sb_fields[type], field_err.buf);
1227                 prt_newline(err);
1228                 bch2_sb_field_to_text(err, sb, f);
1229         }
1230
1231         printbuf_exit(&field_err);
1232         return ret;
1233 }
1234
1235 void __bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1236                              struct bch_sb_field *f)
1237 {
1238         unsigned type = le32_to_cpu(f->type);
1239         const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
1240
1241         if (!out->nr_tabstops)
1242                 printbuf_tabstop_push(out, 32);
1243
1244         if (ops->to_text)
1245                 ops->to_text(out, sb, f);
1246 }
1247
1248 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1249                            struct bch_sb_field *f)
1250 {
1251         unsigned type = le32_to_cpu(f->type);
1252
1253         if (type < BCH_SB_FIELD_NR)
1254                 prt_printf(out, "%s", bch2_sb_fields[type]);
1255         else
1256                 prt_printf(out, "(unknown field %u)", type);
1257
1258         prt_printf(out, " (size %zu):", vstruct_bytes(f));
1259         prt_newline(out);
1260
1261         __bch2_sb_field_to_text(out, sb, f);
1262 }
1263
1264 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1265 {
1266         unsigned i;
1267
1268         prt_printf(out, "Type:                    %u", l->layout_type);
1269         prt_newline(out);
1270
1271         prt_str(out, "Superblock max size:     ");
1272         prt_units_u64(out, 512 << l->sb_max_size_bits);
1273         prt_newline(out);
1274
1275         prt_printf(out, "Nr superblocks:          %u", l->nr_superblocks);
1276         prt_newline(out);
1277
1278         prt_str(out, "Offsets:                 ");
1279         for (i = 0; i < l->nr_superblocks; i++) {
1280                 if (i)
1281                         prt_str(out, ", ");
1282                 prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1283         }
1284         prt_newline(out);
1285 }
1286
1287 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1288                      bool print_layout, unsigned fields)
1289 {
1290         u64 fields_have = 0;
1291         unsigned nr_devices = 0;
1292
1293         if (!out->nr_tabstops)
1294                 printbuf_tabstop_push(out, 44);
1295
1296         for (int i = 0; i < sb->nr_devices; i++)
1297                 nr_devices += bch2_dev_exists(sb, i);
1298
1299         prt_printf(out, "External UUID:");
1300         prt_tab(out);
1301         pr_uuid(out, sb->user_uuid.b);
1302         prt_newline(out);
1303
1304         prt_printf(out, "Internal UUID:");
1305         prt_tab(out);
1306         pr_uuid(out, sb->uuid.b);
1307         prt_newline(out);
1308
1309         prt_printf(out, "Magic number:");
1310         prt_tab(out);
1311         pr_uuid(out, sb->magic.b);
1312         prt_newline(out);
1313
1314         prt_str(out, "Device index:");
1315         prt_tab(out);
1316         prt_printf(out, "%u", sb->dev_idx);
1317         prt_newline(out);
1318
1319         prt_str(out, "Label:");
1320         prt_tab(out);
1321         prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1322         prt_newline(out);
1323
1324         prt_str(out, "Version:");
1325         prt_tab(out);
1326         bch2_version_to_text(out, le16_to_cpu(sb->version));
1327         prt_newline(out);
1328
1329         prt_str(out, "Version upgrade complete:");
1330         prt_tab(out);
1331         bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
1332         prt_newline(out);
1333
1334         prt_printf(out, "Oldest version on disk:");
1335         prt_tab(out);
1336         bch2_version_to_text(out, le16_to_cpu(sb->version_min));
1337         prt_newline(out);
1338
1339         prt_printf(out, "Created:");
1340         prt_tab(out);
1341         if (sb->time_base_lo)
1342                 bch2_prt_datetime(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1343         else
1344                 prt_printf(out, "(not set)");
1345         prt_newline(out);
1346
1347         prt_printf(out, "Sequence number:");
1348         prt_tab(out);
1349         prt_printf(out, "%llu", le64_to_cpu(sb->seq));
1350         prt_newline(out);
1351
1352         prt_printf(out, "Time of last write:");
1353         prt_tab(out);
1354         bch2_prt_datetime(out, le64_to_cpu(sb->write_time));
1355         prt_newline(out);
1356
1357         prt_printf(out, "Superblock size:");
1358         prt_tab(out);
1359         prt_units_u64(out, vstruct_bytes(sb));
1360         prt_str(out, "/");
1361         prt_units_u64(out, 512ULL << sb->layout.sb_max_size_bits);
1362         prt_newline(out);
1363
1364         prt_printf(out, "Clean:");
1365         prt_tab(out);
1366         prt_printf(out, "%llu", BCH_SB_CLEAN(sb));
1367         prt_newline(out);
1368
1369         prt_printf(out, "Devices:");
1370         prt_tab(out);
1371         prt_printf(out, "%u", nr_devices);
1372         prt_newline(out);
1373
1374         prt_printf(out, "Sections:");
1375         vstruct_for_each(sb, f)
1376                 fields_have |= 1 << le32_to_cpu(f->type);
1377         prt_tab(out);
1378         prt_bitflags(out, bch2_sb_fields, fields_have);
1379         prt_newline(out);
1380
1381         prt_printf(out, "Features:");
1382         prt_tab(out);
1383         prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
1384         prt_newline(out);
1385
1386         prt_printf(out, "Compat features:");
1387         prt_tab(out);
1388         prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
1389         prt_newline(out);
1390
1391         prt_newline(out);
1392         prt_printf(out, "Options:");
1393         prt_newline(out);
1394         printbuf_indent_add(out, 2);
1395         {
1396                 enum bch_opt_id id;
1397
1398                 for (id = 0; id < bch2_opts_nr; id++) {
1399                         const struct bch_option *opt = bch2_opt_table + id;
1400
1401                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1402                                 u64 v = bch2_opt_from_sb(sb, id);
1403
1404                                 prt_printf(out, "%s:", opt->attr.name);
1405                                 prt_tab(out);
1406                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1407                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1408                                 prt_newline(out);
1409                         }
1410                 }
1411         }
1412
1413         printbuf_indent_sub(out, 2);
1414
1415         if (print_layout) {
1416                 prt_newline(out);
1417                 prt_printf(out, "layout:");
1418                 prt_newline(out);
1419                 printbuf_indent_add(out, 2);
1420                 bch2_sb_layout_to_text(out, &sb->layout);
1421                 printbuf_indent_sub(out, 2);
1422         }
1423
1424         vstruct_for_each(sb, f)
1425                 if (fields & (1 << le32_to_cpu(f->type))) {
1426                         prt_newline(out);
1427                         bch2_sb_field_to_text(out, sb, f);
1428                 }
1429 }