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 "btree_update_interior.h"
   5 #include "buckets.h"
   6 #include "checksum.h"
   7 #include "disk_groups.h"
   8 #include "ec.h"
   9 #include "error.h"
  10 #include "io.h"
  11 #include "journal.h"
  12 #include "journal_io.h"
  13 #include "journal_sb.h"
  14 #include "journal_seq_blacklist.h"
  15 #include "replicas.h"
  16 #include "quota.h"
  17 #include "super-io.h"
  18 #include "super.h"
  19 #include "vstructs.h"
  20 #include "counters.h"
  21
  22 #include <linux/backing-dev.h>
  23 #include <linux/sort.h>
  24
  25 #include <trace/events/bcachefs.h>
  26
  27 const char * const bch2_sb_fields[] = {
  28 #define x(name, nr)     #name,
  29         BCH_SB_FIELDS()
  30 #undef x
  31         NULL
  32 };
  33
  34 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
  35                                   struct printbuf *);
  36
  37 struct bch_sb_field *bch2_sb_field_get(struct bch_sb *sb,
  38                                       enum bch_sb_field_type type)
  39 {
  40         struct bch_sb_field *f;
  41
  42         /* XXX: need locking around superblock to access optional fields */
  43
  44         vstruct_for_each(sb, f)
  45                 if (le32_to_cpu(f->type) == type)
  46                         return f;
  47         return NULL;
  48 }
  49
  50 static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
  51                                                    struct bch_sb_field *f,
  52                                                    unsigned u64s)
  53 {
  54         unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
  55         unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
  56
  57         BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
  58
  59         if (!f && !u64s) {
  60                 /* nothing to do: */
  61         } else if (!f) {
  62                 f = vstruct_last(sb->sb);
  63                 memset(f, 0, sizeof(u64) * u64s);
  64                 f->u64s = cpu_to_le32(u64s);
  65                 f->type = 0;
  66         } else {
  67                 void *src, *dst;
  68
  69                 src = vstruct_end(f);
  70
  71                 if (u64s) {
  72                         f->u64s = cpu_to_le32(u64s);
  73                         dst = vstruct_end(f);
  74                 } else {
  75                         dst = f;
  76                 }
  77
  78                 memmove(dst, src, vstruct_end(sb->sb) - src);
  79
  80                 if (dst > src)
  81                         memset(src, 0, dst - src);
  82         }
  83
  84         sb->sb->u64s = cpu_to_le32(sb_u64s);
  85
  86         return u64s ? f : NULL;
  87 }
  88
  89 void bch2_sb_field_delete(struct bch_sb_handle *sb,
  90                           enum bch_sb_field_type type)
  91 {
  92         struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
  93
  94         if (f)
  95                 __bch2_sb_field_resize(sb, f, 0);
  96 }
  97
  98 /* Superblock realloc/free: */
  99
 100 void bch2_free_super(struct bch_sb_handle *sb)
 101 {
 102         if (sb->bio)
 103                 bio_put(sb->bio);
 104         if (!IS_ERR_OR_NULL(sb->bdev))
 105                 blkdev_put(sb->bdev, sb->mode);
 106
 107         kfree(sb->sb);
 108         memset(sb, 0, sizeof(*sb));
 109 }
 110
 111 int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 112 {
 113         size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
 114         size_t new_buffer_size;
 115         struct bch_sb *new_sb;
 116         struct bio *bio;
 117
 118         if (sb->bdev)
 119                 new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
 120
 121         new_buffer_size = roundup_pow_of_two(new_bytes);
 122
 123         if (sb->sb && sb->buffer_size >= new_buffer_size)
 124                 return 0;
 125
 126         if (sb->have_layout) {
 127                 u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
 128
 129                 if (new_bytes > max_bytes) {
 130                         char buf[BDEVNAME_SIZE];
 131
 132                         pr_err("%s: superblock too big: want %zu but have %llu",
 133                                bdevname(sb->bdev, buf), new_bytes, max_bytes);
 134                         return -ENOSPC;
 135                 }
 136         }
 137
 138         if (sb->buffer_size >= new_buffer_size && sb->sb)
 139                 return 0;
 140
 141         if (dynamic_fault("bcachefs:add:super_realloc"))
 142                 return -ENOMEM;
 143
 144         if (sb->have_bio) {
 145                 bio = bio_kmalloc(GFP_KERNEL,
 146                         DIV_ROUND_UP(new_buffer_size, PAGE_SIZE));
 147                 if (!bio)
 148                         return -ENOMEM;
 149
 150                 if (sb->bio)
 151                         bio_put(sb->bio);
 152                 sb->bio = bio;
 153         }
 154
 155         new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
 156         if (!new_sb)
 157                 return -ENOMEM;
 158
 159         sb->sb = new_sb;
 160         sb->buffer_size = new_buffer_size;
 161
 162         return 0;
 163 }
 164
 165 struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *sb,
 166                                           enum bch_sb_field_type type,
 167                                           unsigned u64s)
 168 {
 169         struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
 170         ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 171         ssize_t d = -old_u64s + u64s;
 172
 173         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
 174                 return NULL;
 175
 176         if (sb->fs_sb) {
 177                 struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
 178                 struct bch_dev *ca;
 179                 unsigned i;
 180
 181                 lockdep_assert_held(&c->sb_lock);
 182
 183                 /* XXX: we're not checking that offline device have enough space */
 184
 185                 for_each_online_member(ca, c, i) {
 186                         struct bch_sb_handle *sb = &ca->disk_sb;
 187
 188                         if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d)) {
 189                                 percpu_ref_put(&ca->ref);
 190                                 return NULL;
 191                         }
 192                 }
 193         }
 194
 195         f = bch2_sb_field_get(sb->sb, type);
 196         f = __bch2_sb_field_resize(sb, f, u64s);
 197         if (f)
 198                 f->type = cpu_to_le32(type);
 199         return f;
 200 }
 201
 202 /* Superblock validate: */
 203
 204 static inline void __bch2_sb_layout_size_assert(void)
 205 {
 206         BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
 207 }
 208
 209 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
 210 {
 211         u64 offset, prev_offset, max_sectors;
 212         unsigned i;
 213
 214         if (uuid_le_cmp(layout->magic, BCACHE_MAGIC)) {
 215                 pr_buf(out, "Not a bcachefs superblock layout");
 216                 return -EINVAL;
 217         }
 218
 219         if (layout->layout_type != 0) {
 220                 pr_buf(out, "Invalid superblock layout type %u",
 221                        layout->layout_type);
 222                 return -EINVAL;
 223         }
 224
 225         if (!layout->nr_superblocks) {
 226                 pr_buf(out, "Invalid superblock layout: no superblocks");
 227                 return -EINVAL;
 228         }
 229
 230         if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
 231                 pr_buf(out, "Invalid superblock layout: too many superblocks");
 232                 return -EINVAL;
 233         }
 234
 235         max_sectors = 1 << layout->sb_max_size_bits;
 236
 237         prev_offset = le64_to_cpu(layout->sb_offset[0]);
 238
 239         for (i = 1; i < layout->nr_superblocks; i++) {
 240                 offset = le64_to_cpu(layout->sb_offset[i]);
 241
 242                 if (offset < prev_offset + max_sectors) {
 243                         pr_buf(out, "Invalid superblock layout: superblocks overlap\n"
 244                                "  (sb %u ends at %llu next starts at %llu",
 245                                i - 1, prev_offset + max_sectors, offset);
 246                         return -EINVAL;
 247                 }
 248                 prev_offset = offset;
 249         }
 250
 251         return 0;
 252 }
 253
 254 static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 255                             int rw)
 256 {
 257         struct bch_sb *sb = disk_sb->sb;
 258         struct bch_sb_field *f;
 259         struct bch_sb_field_members *mi;
 260         enum bch_opt_id opt_id;
 261         u32 version, version_min;
 262         u16 block_size;
 263         int ret;
 264
 265         version         = le16_to_cpu(sb->version);
 266         version_min     = version >= bcachefs_metadata_version_bkey_renumber
 267                 ? le16_to_cpu(sb->version_min)
 268                 : version;
 269
 270         if (version    >= bcachefs_metadata_version_max) {
 271                 pr_buf(out, "Unsupported superblock version %u (min %u, max %u)",
 272                        version, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
 273                 return -EINVAL;
 274         }
 275
 276         if (version_min < bcachefs_metadata_version_min) {
 277                 pr_buf(out, "Unsupported superblock version %u (min %u, max %u)",
 278                        version_min, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
 279                 return -EINVAL;
 280         }
 281
 282         if (version_min > version) {
 283                 pr_buf(out, "Bad minimum version %u, greater than version field %u",
 284                        version_min, version);
 285                 return -EINVAL;
 286         }
 287
 288         if (sb->features[1] ||
 289             (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
 290                 pr_buf(out, "Filesystem has incompatible features");
 291                 return -EINVAL;
 292         }
 293
 294         block_size = le16_to_cpu(sb->block_size);
 295
 296         if (block_size > PAGE_SECTORS) {
 297                 pr_buf(out, "Block size too big (got %u, max %u)",
 298                        block_size, PAGE_SECTORS);
 299                 return -EINVAL;
 300         }
 301
 302         if (bch2_is_zero(sb->user_uuid.b, sizeof(uuid_le))) {
 303                 pr_buf(out, "Bad user UUID (got zeroes)");
 304                 return -EINVAL;
 305         }
 306
 307         if (bch2_is_zero(sb->uuid.b, sizeof(uuid_le))) {
 308                 pr_buf(out, "Bad intenal UUID (got zeroes)");
 309                 return -EINVAL;
 310         }
 311
 312         if (!sb->nr_devices ||
 313             sb->nr_devices > BCH_SB_MEMBERS_MAX) {
 314                 pr_buf(out, "Bad number of member devices %u (max %u)",
 315                        sb->nr_devices, BCH_SB_MEMBERS_MAX);
 316                 return -EINVAL;
 317         }
 318
 319         if (sb->dev_idx >= sb->nr_devices) {
 320                 pr_buf(out, "Bad dev_idx (got %u, nr_devices %u)",
 321                        sb->dev_idx, sb->nr_devices);
 322                 return -EINVAL;
 323         }
 324
 325         if (!sb->time_precision ||
 326             le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
 327                 pr_buf(out, "Invalid time precision: %u (min 1, max %lu)",
 328                        le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
 329                 return -EINVAL;
 330         }
 331
 332         if (rw == READ) {
 333                 /*
 334                  * Been seeing a bug where these are getting inexplicably
 335                  * zeroed, so we'r now validating them, but we have to be
 336                  * careful not to preven people's filesystems from mounting:
 337                  */
 338                 if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
 339                         SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 340                 if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 341                         SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
 342         }
 343
 344         for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
 345                 const struct bch_option *opt = bch2_opt_table + opt_id;
 346
 347                 if (opt->get_sb != BCH2_NO_SB_OPT) {
 348                         u64 v = bch2_opt_from_sb(sb, opt_id);
 349
 350                         pr_buf(out, "Invalid option ");
 351                         ret = bch2_opt_validate(opt, v, out);
 352                         if (ret)
 353                                 return ret;
 354
 355                         printbuf_reset(out);
 356                 }
 357         }
 358
 359         /* validate layout */
 360         ret = validate_sb_layout(&sb->layout, out);
 361         if (ret)
 362                 return ret;
 363
 364         vstruct_for_each(sb, f) {
 365                 if (!f->u64s) {
 366                         pr_buf(out, "Invalid superblock: optional with size 0 (type %u)",
 367                                le32_to_cpu(f->type));
 368                         return -EINVAL;
 369                 }
 370
 371                 if (vstruct_next(f) > vstruct_last(sb)) {
 372                         pr_buf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
 373                                le32_to_cpu(f->type));
 374                         return -EINVAL;
 375                 }
 376         }
 377
 378         /* members must be validated first: */
 379         mi = bch2_sb_get_members(sb);
 380         if (!mi) {
 381                 pr_buf(out, "Invalid superblock: member info area missing");
 382                 return -EINVAL;
 383         }
 384
 385         ret = bch2_sb_field_validate(sb, &mi->field, out);
 386         if (ret)
 387                 return ret;
 388
 389         vstruct_for_each(sb, f) {
 390                 if (le32_to_cpu(f->type) == BCH_SB_FIELD_members)
 391                         continue;
 392
 393                 ret = bch2_sb_field_validate(sb, f, out);
 394                 if (ret)
 395                         return ret;
 396         }
 397
 398         return 0;
 399 }
 400
 401 /* device open: */
 402
 403 static void bch2_sb_update(struct bch_fs *c)
 404 {
 405         struct bch_sb *src = c->disk_sb.sb;
 406         struct bch_sb_field_members *mi = bch2_sb_get_members(src);
 407         struct bch_dev *ca;
 408         unsigned i;
 409
 410         lockdep_assert_held(&c->sb_lock);
 411
 412         c->sb.uuid              = src->uuid;
 413         c->sb.user_uuid         = src->user_uuid;
 414         c->sb.version           = le16_to_cpu(src->version);
 415         c->sb.version_min       = le16_to_cpu(src->version_min);
 416         c->sb.nr_devices        = src->nr_devices;
 417         c->sb.clean             = BCH_SB_CLEAN(src);
 418         c->sb.encryption_type   = BCH_SB_ENCRYPTION_TYPE(src);
 419
 420         c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
 421         c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
 422
 423         /* XXX this is wrong, we need a 96 or 128 bit integer type */
 424         c->sb.time_base_lo      = div_u64(le64_to_cpu(src->time_base_lo),
 425                                           c->sb.nsec_per_time_unit);
 426         c->sb.time_base_hi      = le32_to_cpu(src->time_base_hi);
 427
 428         c->sb.features          = le64_to_cpu(src->features[0]);
 429         c->sb.compat            = le64_to_cpu(src->compat[0]);
 430
 431         for_each_member_device(ca, c, i)
 432                 ca->mi = bch2_mi_to_cpu(mi->members + i);
 433 }
 434
 435 static void __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
 436 {
 437         struct bch_sb_field *src_f, *dst_f;
 438         struct bch_sb *dst = dst_handle->sb;
 439         unsigned i;
 440
 441         dst->version            = src->version;
 442         dst->version_min        = src->version_min;
 443         dst->seq                = src->seq;
 444         dst->uuid               = src->uuid;
 445         dst->user_uuid          = src->user_uuid;
 446         memcpy(dst->label,      src->label, sizeof(dst->label));
 447
 448         dst->block_size         = src->block_size;
 449         dst->nr_devices         = src->nr_devices;
 450
 451         dst->time_base_lo       = src->time_base_lo;
 452         dst->time_base_hi       = src->time_base_hi;
 453         dst->time_precision     = src->time_precision;
 454
 455         memcpy(dst->flags,      src->flags,     sizeof(dst->flags));
 456         memcpy(dst->features,   src->features,  sizeof(dst->features));
 457         memcpy(dst->compat,     src->compat,    sizeof(dst->compat));
 458
 459         for (i = 0; i < BCH_SB_FIELD_NR; i++) {
 460                 if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
 461                         continue;
 462
 463                 src_f = bch2_sb_field_get(src, i);
 464                 dst_f = bch2_sb_field_get(dst, i);
 465                 dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
 466                                 src_f ? le32_to_cpu(src_f->u64s) : 0);
 467
 468                 if (src_f)
 469                         memcpy(dst_f, src_f, vstruct_bytes(src_f));
 470         }
 471 }
 472
 473 int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
 474 {
 475         struct bch_sb_field_journal *journal_buckets =
 476                 bch2_sb_get_journal(src);
 477         unsigned journal_u64s = journal_buckets
 478                 ? le32_to_cpu(journal_buckets->field.u64s)
 479                 : 0;
 480         int ret;
 481
 482         lockdep_assert_held(&c->sb_lock);
 483
 484         ret = bch2_sb_realloc(&c->disk_sb,
 485                               le32_to_cpu(src->u64s) - journal_u64s);
 486         if (ret)
 487                 return ret;
 488
 489         __copy_super(&c->disk_sb, src);
 490
 491         ret = bch2_sb_replicas_to_cpu_replicas(c);
 492         if (ret)
 493                 return ret;
 494
 495         ret = bch2_sb_disk_groups_to_cpu(c);
 496         if (ret)
 497                 return ret;
 498
 499         bch2_sb_update(c);
 500         return 0;
 501 }
 502
 503 int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
 504 {
 505         struct bch_sb *src = c->disk_sb.sb, *dst = ca->disk_sb.sb;
 506         struct bch_sb_field_journal *journal_buckets =
 507                 bch2_sb_get_journal(dst);
 508         unsigned journal_u64s = journal_buckets
 509                 ? le32_to_cpu(journal_buckets->field.u64s)
 510                 : 0;
 511         unsigned u64s = le32_to_cpu(src->u64s) + journal_u64s;
 512         int ret;
 513
 514         ret = bch2_sb_realloc(&ca->disk_sb, u64s);
 515         if (ret)
 516                 return ret;
 517
 518         __copy_super(&ca->disk_sb, src);
 519         return 0;
 520 }
 521
 522 /* read superblock: */
 523
 524 static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
 525 {
 526         struct bch_csum csum;
 527         u32 version, version_min;
 528         size_t bytes;
 529         int ret;
 530 reread:
 531         bio_reset(sb->bio);
 532         bio_set_dev(sb->bio, sb->bdev);
 533         sb->bio->bi_iter.bi_sector = offset;
 534         bio_set_op_attrs(sb->bio, REQ_OP_READ, REQ_SYNC|REQ_META);
 535         bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
 536
 537         ret = submit_bio_wait(sb->bio);
 538         if (ret) {
 539                 pr_buf(err, "IO error: %i", ret);
 540                 return ret;
 541         }
 542
 543         if (uuid_le_cmp(sb->sb->magic, BCACHE_MAGIC)) {
 544                 pr_buf(err, "Not a bcachefs superblock");
 545                 return -EINVAL;
 546         }
 547
 548         version         = le16_to_cpu(sb->sb->version);
 549         version_min     = version >= bcachefs_metadata_version_bkey_renumber
 550                 ? le16_to_cpu(sb->sb->version_min)
 551                 : version;
 552
 553         if (version    >= bcachefs_metadata_version_max) {
 554                 pr_buf(err, "Unsupported superblock version %u (min %u, max %u)",
 555                        version, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
 556                 return -EINVAL;
 557         }
 558
 559         if (version_min < bcachefs_metadata_version_min) {
 560                 pr_buf(err, "Unsupported superblock version %u (min %u, max %u)",
 561                        version_min, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
 562                 return -EINVAL;
 563         }
 564
 565         bytes = vstruct_bytes(sb->sb);
 566
 567         if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
 568                 pr_buf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
 569                        bytes, 512UL << sb->sb->layout.sb_max_size_bits);
 570                 return -EINVAL;
 571         }
 572
 573         if (bytes > sb->buffer_size) {
 574                 if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s)))
 575                         return -ENOMEM;
 576                 goto reread;
 577         }
 578
 579         if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
 580                 pr_buf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
 581                 return -EINVAL;
 582         }
 583
 584         /* XXX: verify MACs */
 585         csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
 586                             null_nonce(), sb->sb);
 587
 588         if (bch2_crc_cmp(csum, sb->sb->csum)) {
 589                 pr_buf(err, "bad checksum");
 590                 return -EINVAL;
 591         }
 592
 593         sb->seq = le64_to_cpu(sb->sb->seq);
 594
 595         return 0;
 596 }
 597
 598 int bch2_read_super(const char *path, struct bch_opts *opts,
 599                     struct bch_sb_handle *sb)
 600 {
 601         u64 offset = opt_get(*opts, sb);
 602         struct bch_sb_layout layout;
 603         struct printbuf err = PRINTBUF;
 604         __le64 *i;
 605         int ret;
 606
 607         pr_verbose_init(*opts, "");
 608
 609         memset(sb, 0, sizeof(*sb));
 610         sb->mode        = FMODE_READ;
 611         sb->have_bio    = true;
 612
 613         if (!opt_get(*opts, noexcl))
 614                 sb->mode |= FMODE_EXCL;
 615
 616         if (!opt_get(*opts, nochanges))
 617                 sb->mode |= FMODE_WRITE;
 618
 619         sb->bdev = blkdev_get_by_path(path, sb->mode, sb);
 620         if (IS_ERR(sb->bdev) &&
 621             PTR_ERR(sb->bdev) == -EACCES &&
 622             opt_get(*opts, read_only)) {
 623                 sb->mode &= ~FMODE_WRITE;
 624
 625                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb);
 626                 if (!IS_ERR(sb->bdev))
 627                         opt_set(*opts, nochanges, true);
 628         }
 629
 630         if (IS_ERR(sb->bdev)) {
 631                 ret = PTR_ERR(sb->bdev);
 632                 goto out;
 633         }
 634
 635         ret = bch2_sb_realloc(sb, 0);
 636         if (ret) {
 637                 pr_buf(&err, "error allocating memory for superblock");
 638                 goto err;
 639         }
 640
 641         if (bch2_fs_init_fault("read_super")) {
 642                 pr_buf(&err, "dynamic fault");
 643                 ret = -EFAULT;
 644                 goto err;
 645         }
 646
 647         ret = read_one_super(sb, offset, &err);
 648         if (!ret)
 649                 goto got_super;
 650
 651         if (opt_defined(*opts, sb))
 652                 goto err;
 653
 654         printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s",
 655                path, err.buf);
 656         printbuf_reset(&err);
 657
 658         /*
 659          * Error reading primary superblock - read location of backup
 660          * superblocks:
 661          */
 662         bio_reset(sb->bio);
 663         bio_set_dev(sb->bio, sb->bdev);
 664         sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
 665         bio_set_op_attrs(sb->bio, REQ_OP_READ, REQ_SYNC|REQ_META);
 666         /*
 667          * use sb buffer to read layout, since sb buffer is page aligned but
 668          * layout won't be:
 669          */
 670         bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
 671
 672         ret = submit_bio_wait(sb->bio);
 673         if (ret) {
 674                 pr_buf(&err, "IO error: %i", ret);
 675                 goto err;
 676         }
 677
 678         memcpy(&layout, sb->sb, sizeof(layout));
 679         ret = validate_sb_layout(&layout, &err);
 680         if (ret)
 681                 goto err;
 682
 683         for (i = layout.sb_offset;
 684              i < layout.sb_offset + layout.nr_superblocks; i++) {
 685                 offset = le64_to_cpu(*i);
 686
 687                 if (offset == opt_get(*opts, sb))
 688                         continue;
 689
 690                 ret = read_one_super(sb, offset, &err);
 691                 if (!ret)
 692                         goto got_super;
 693         }
 694
 695         goto err;
 696
 697 got_super:
 698         if (le16_to_cpu(sb->sb->block_size) << 9 <
 699             bdev_logical_block_size(sb->bdev)) {
 700                 pr_buf(&err, "block size (%u) smaller than device block size (%u)",
 701                        le16_to_cpu(sb->sb->block_size) << 9,
 702                        bdev_logical_block_size(sb->bdev));
 703                 ret = -EINVAL;
 704                 goto err;
 705         }
 706
 707         ret = 0;
 708         sb->have_layout = true;
 709
 710         ret = bch2_sb_validate(sb, &err, READ);
 711         if (ret) {
 712                 printk(KERN_ERR "bcachefs (%s): error validating superblock: %s",
 713                        path, err.buf);
 714                 goto err_no_print;
 715         }
 716 out:
 717         pr_verbose_init(*opts, "ret %i", ret);
 718         printbuf_exit(&err);
 719         return ret;
 720 err:
 721         printk(KERN_ERR "bcachefs (%s): error reading superblock: %s",
 722                path, err.buf);
 723 err_no_print:
 724         bch2_free_super(sb);
 725         goto out;
 726 }
 727
 728 /* write superblock: */
 729
 730 static void write_super_endio(struct bio *bio)
 731 {
 732         struct bch_dev *ca = bio->bi_private;
 733
 734         /* XXX: return errors directly */
 735
 736         if (bch2_dev_io_err_on(bio->bi_status, ca, "superblock write error: %s",
 737                                bch2_blk_status_to_str(bio->bi_status)))
 738                 ca->sb_write_error = 1;
 739
 740         closure_put(&ca->fs->sb_write);
 741         percpu_ref_put(&ca->io_ref);
 742 }
 743
 744 static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
 745 {
 746         struct bch_sb *sb = ca->disk_sb.sb;
 747         struct bio *bio = ca->disk_sb.bio;
 748
 749         bio_reset(bio);
 750         bio_set_dev(bio, ca->disk_sb.bdev);
 751         bio->bi_iter.bi_sector  = le64_to_cpu(sb->layout.sb_offset[0]);
 752         bio->bi_end_io          = write_super_endio;
 753         bio->bi_private         = ca;
 754         bio_set_op_attrs(bio, REQ_OP_READ, REQ_SYNC|REQ_META);
 755         bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
 756
 757         this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
 758                      bio_sectors(bio));
 759
 760         percpu_ref_get(&ca->io_ref);
 761         closure_bio_submit(bio, &c->sb_write);
 762 }
 763
 764 static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
 765 {
 766         struct bch_sb *sb = ca->disk_sb.sb;
 767         struct bio *bio = ca->disk_sb.bio;
 768
 769         sb->offset = sb->layout.sb_offset[idx];
 770
 771         SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
 772         sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
 773                                 null_nonce(), sb);
 774
 775         bio_reset(bio);
 776         bio_set_dev(bio, ca->disk_sb.bdev);
 777         bio->bi_iter.bi_sector  = le64_to_cpu(sb->offset);
 778         bio->bi_end_io          = write_super_endio;
 779         bio->bi_private         = ca;
 780         bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC|REQ_META);
 781         bch2_bio_map(bio, sb,
 782                      roundup((size_t) vstruct_bytes(sb),
 783                              bdev_logical_block_size(ca->disk_sb.bdev)));
 784
 785         this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
 786                      bio_sectors(bio));
 787
 788         percpu_ref_get(&ca->io_ref);
 789         closure_bio_submit(bio, &c->sb_write);
 790 }
 791
 792 int bch2_write_super(struct bch_fs *c)
 793 {
 794         struct closure *cl = &c->sb_write;
 795         struct bch_dev *ca;
 796         struct printbuf err = PRINTBUF;
 797         unsigned i, sb = 0, nr_wrote;
 798         struct bch_devs_mask sb_written;
 799         bool wrote, can_mount_without_written, can_mount_with_written;
 800         unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
 801         int ret = 0;
 802
 803         trace_write_super(c, _RET_IP_);
 804
 805         if (c->opts.very_degraded)
 806                 degraded_flags |= BCH_FORCE_IF_LOST;
 807
 808         lockdep_assert_held(&c->sb_lock);
 809
 810         closure_init_stack(cl);
 811         memset(&sb_written, 0, sizeof(sb_written));
 812
 813         le64_add_cpu(&c->disk_sb.sb->seq, 1);
 814
 815         if (test_bit(BCH_FS_ERROR, &c->flags))
 816                 SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
 817         if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags))
 818                 SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 819
 820         SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 821
 822         bch2_sb_counters_from_cpu(c);
 823
 824         for_each_online_member(ca, c, i)
 825                 bch2_sb_from_fs(c, ca);
 826
 827         for_each_online_member(ca, c, i) {
 828                 printbuf_reset(&err);
 829
 830                 ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE);
 831                 if (ret) {
 832                         bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
 833                         percpu_ref_put(&ca->io_ref);
 834                         goto out;
 835                 }
 836         }
 837
 838         if (c->opts.nochanges)
 839                 goto out;
 840
 841         /*
 842          * Defer writing the superblock until filesystem initialization is
 843          * complete - don't write out a partly initialized superblock:
 844          */
 845         if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
 846                 goto out;
 847
 848         for_each_online_member(ca, c, i) {
 849                 __set_bit(ca->dev_idx, sb_written.d);
 850                 ca->sb_write_error = 0;
 851         }
 852
 853         for_each_online_member(ca, c, i)
 854                 read_back_super(c, ca);
 855         closure_sync(cl);
 856
 857         for_each_online_member(ca, c, i) {
 858                 if (ca->sb_write_error)
 859                         continue;
 860
 861                 if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
 862                         bch2_fs_fatal_error(c,
 863                                 "Superblock write was silently dropped! (seq %llu expected %llu)",
 864                                 le64_to_cpu(ca->sb_read_scratch->seq),
 865                                 ca->disk_sb.seq);
 866                         percpu_ref_put(&ca->io_ref);
 867                         ret = -EROFS;
 868                         goto out;
 869                 }
 870
 871                 if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
 872                         bch2_fs_fatal_error(c,
 873                                 "Superblock modified by another process (seq %llu expected %llu)",
 874                                 le64_to_cpu(ca->sb_read_scratch->seq),
 875                                 ca->disk_sb.seq);
 876                         percpu_ref_put(&ca->io_ref);
 877                         ret = -EROFS;
 878                         goto out;
 879                 }
 880         }
 881
 882         do {
 883                 wrote = false;
 884                 for_each_online_member(ca, c, i)
 885                         if (!ca->sb_write_error &&
 886                             sb < ca->disk_sb.sb->layout.nr_superblocks) {
 887                                 write_one_super(c, ca, sb);
 888                                 wrote = true;
 889                         }
 890                 closure_sync(cl);
 891                 sb++;
 892         } while (wrote);
 893
 894         for_each_online_member(ca, c, i) {
 895                 if (ca->sb_write_error)
 896                         __clear_bit(ca->dev_idx, sb_written.d);
 897                 else
 898                         ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
 899         }
 900
 901         nr_wrote = dev_mask_nr(&sb_written);
 902
 903         can_mount_with_written =
 904                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 905
 906         for (i = 0; i < ARRAY_SIZE(sb_written.d); i++)
 907                 sb_written.d[i] = ~sb_written.d[i];
 908
 909         can_mount_without_written =
 910                 bch2_have_enough_devs(c, sb_written, degraded_flags, false);
 911
 912         /*
 913          * If we would be able to mount _without_ the devices we successfully
 914          * wrote superblocks to, we weren't able to write to enough devices:
 915          *
 916          * Exception: if we can mount without the successes because we haven't
 917          * written anything (new filesystem), we continue if we'd be able to
 918          * mount with the devices we did successfully write to:
 919          */
 920         if (bch2_fs_fatal_err_on(!nr_wrote ||
 921                                  !can_mount_with_written ||
 922                                  (can_mount_without_written &&
 923                                   !can_mount_with_written), c,
 924                 "Unable to write superblock to sufficient devices (from %ps)",
 925                 (void *) _RET_IP_))
 926                 ret = -1;
 927 out:
 928         /* Make new options visible after they're persistent: */
 929         bch2_sb_update(c);
 930         printbuf_exit(&err);
 931         return ret;
 932 }
 933
 934 void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
 935 {
 936         mutex_lock(&c->sb_lock);
 937         if (!(c->sb.features & (1ULL << feat))) {
 938                 c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
 939
 940                 bch2_write_super(c);
 941         }
 942         mutex_unlock(&c->sb_lock);
 943 }
 944
 945 /* BCH_SB_FIELD_members: */
 946
 947 static int bch2_sb_members_validate(struct bch_sb *sb,
 948                                     struct bch_sb_field *f,
 949                                     struct printbuf *err)
 950 {
 951         struct bch_sb_field_members *mi = field_to_type(f, members);
 952         unsigned i;
 953
 954         if ((void *) (mi->members + sb->nr_devices) >
 955             vstruct_end(&mi->field)) {
 956                 pr_buf(err, "too many devices for section size");
 957                 return -EINVAL;
 958         }
 959
 960         for (i = 0; i < sb->nr_devices; i++) {
 961                 struct bch_member *m = mi->members + i;
 962
 963                 if (!bch2_member_exists(m))
 964                         continue;
 965
 966                 if (le64_to_cpu(m->nbuckets) > LONG_MAX) {
 967                         pr_buf(err, "device %u: too many buckets (got %llu, max %lu)",
 968                                i, le64_to_cpu(m->nbuckets), LONG_MAX);
 969                         return -EINVAL;
 970                 }
 971
 972                 if (le64_to_cpu(m->nbuckets) -
 973                     le16_to_cpu(m->first_bucket) < BCH_MIN_NR_NBUCKETS) {
 974                         pr_buf(err, "device %u: not enough buckets (got %llu, max %u)",
 975                                i, le64_to_cpu(m->nbuckets), BCH_MIN_NR_NBUCKETS);
 976                         return -EINVAL;
 977                 }
 978
 979                 if (le16_to_cpu(m->bucket_size) <
 980                     le16_to_cpu(sb->block_size)) {
 981                         pr_buf(err, "device %u: bucket size %u smaller than block size %u",
 982                                i, le16_to_cpu(m->bucket_size), le16_to_cpu(sb->block_size));
 983                         return -EINVAL;
 984                 }
 985
 986                 if (le16_to_cpu(m->bucket_size) <
 987                     BCH_SB_BTREE_NODE_SIZE(sb)) {
 988                         pr_buf(err, "device %u: bucket size %u smaller than btree node size %llu",
 989                                i, le16_to_cpu(m->bucket_size), BCH_SB_BTREE_NODE_SIZE(sb));
 990                         return -EINVAL;
 991                 }
 992         }
 993
 994         return 0;
 995 }
 996
 997 static void bch2_sb_members_to_text(struct printbuf *out, struct bch_sb *sb,
 998                                     struct bch_sb_field *f)
 999 {
1000         struct bch_sb_field_members *mi = field_to_type(f, members);
1001         struct bch_sb_field_disk_groups *gi = bch2_sb_get_disk_groups(sb);
1002         unsigned i;
1003
1004         for (i = 0; i < sb->nr_devices; i++) {
1005                 struct bch_member *m = mi->members + i;
1006                 unsigned data_have = bch2_sb_dev_has_data(sb, i);
1007                 u64 bucket_size = le16_to_cpu(m->bucket_size);
1008                 u64 device_size = le64_to_cpu(m->nbuckets) * bucket_size;
1009
1010                 if (!bch2_member_exists(m))
1011                         continue;
1012
1013                 pr_buf(out, "Device:");
1014                 pr_tab(out);
1015                 pr_buf(out, "%u", i);
1016                 pr_newline(out);
1017
1018                 pr_indent_push(out, 2);
1019
1020                 pr_buf(out, "UUID:");
1021                 pr_tab(out);
1022                 pr_uuid(out, m->uuid.b);
1023                 pr_newline(out);
1024
1025                 pr_buf(out, "Size:");
1026                 pr_tab(out);
1027                 pr_units(out, device_size, device_size << 9);
1028                 pr_newline(out);
1029
1030                 pr_buf(out, "Bucket size:");
1031                 pr_tab(out);
1032                 pr_units(out, bucket_size, bucket_size << 9);
1033                 pr_newline(out);
1034
1035                 pr_buf(out, "First bucket:");
1036                 pr_tab(out);
1037                 pr_buf(out, "%u", le16_to_cpu(m->first_bucket));
1038                 pr_newline(out);
1039
1040                 pr_buf(out, "Buckets:");
1041                 pr_tab(out);
1042                 pr_buf(out, "%llu", le64_to_cpu(m->nbuckets));
1043                 pr_newline(out);
1044
1045                 pr_buf(out, "Last mount:");
1046                 pr_tab(out);
1047                 if (m->last_mount)
1048                         pr_time(out, le64_to_cpu(m->last_mount));
1049                 else
1050                         pr_buf(out, "(never)");
1051                 pr_newline(out);
1052
1053                 pr_buf(out, "State:");
1054                 pr_tab(out);
1055                 pr_buf(out, "%s",
1056                        BCH_MEMBER_STATE(m) < BCH_MEMBER_STATE_NR
1057                        ? bch2_member_states[BCH_MEMBER_STATE(m)]
1058                        : "unknown");
1059                 pr_newline(out);
1060
1061                 pr_buf(out, "Group:");
1062                 pr_tab(out);
1063                 if (BCH_MEMBER_GROUP(m)) {
1064                         unsigned idx = BCH_MEMBER_GROUP(m) - 1;
1065
1066                         if (idx < disk_groups_nr(gi))
1067                                 pr_buf(out, "%s (%u)",
1068                                        gi->entries[idx].label, idx);
1069                         else
1070                                 pr_buf(out, "(bad disk labels section)");
1071                 } else {
1072                         pr_buf(out, "(none)");
1073                 }
1074                 pr_newline(out);
1075
1076                 pr_buf(out, "Data allowed:");
1077                 pr_tab(out);
1078                 if (BCH_MEMBER_DATA_ALLOWED(m))
1079                         bch2_flags_to_text(out, bch2_data_types,
1080                                            BCH_MEMBER_DATA_ALLOWED(m));
1081                 else
1082                         pr_buf(out, "(none)");
1083                 pr_newline(out);
1084
1085                 pr_buf(out, "Has data:");
1086                 pr_tab(out);
1087                 if (data_have)
1088                         bch2_flags_to_text(out, bch2_data_types, data_have);
1089                 else
1090                         pr_buf(out, "(none)");
1091                 pr_newline(out);
1092
1093                 pr_buf(out, "Discard:");
1094                 pr_tab(out);
1095                 pr_buf(out, "%llu", BCH_MEMBER_DISCARD(m));
1096                 pr_newline(out);
1097
1098                 pr_buf(out, "Freespace initialized:");
1099                 pr_tab(out);
1100                 pr_buf(out, "%llu", BCH_MEMBER_FREESPACE_INITIALIZED(m));
1101                 pr_newline(out);
1102
1103                 pr_indent_pop(out, 2);
1104         }
1105 }
1106
1107 static const struct bch_sb_field_ops bch_sb_field_ops_members = {
1108         .validate       = bch2_sb_members_validate,
1109         .to_text        = bch2_sb_members_to_text,
1110 };
1111
1112 /* BCH_SB_FIELD_crypt: */
1113
1114 static int bch2_sb_crypt_validate(struct bch_sb *sb,
1115                                   struct bch_sb_field *f,
1116                                   struct printbuf *err)
1117 {
1118         struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
1119
1120         if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) {
1121                 pr_buf(err, "wrong size (got %zu should be %zu)",
1122                        vstruct_bytes(&crypt->field), sizeof(*crypt));
1123                 return -EINVAL;
1124         }
1125
1126         if (BCH_CRYPT_KDF_TYPE(crypt)) {
1127                 pr_buf(err, "bad kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt));
1128                 return -EINVAL;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static void bch2_sb_crypt_to_text(struct printbuf *out, struct bch_sb *sb,
1135                                   struct bch_sb_field *f)
1136 {
1137         struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
1138
1139         pr_buf(out, "KFD:               %llu", BCH_CRYPT_KDF_TYPE(crypt));
1140         pr_newline(out);
1141         pr_buf(out, "scrypt n:          %llu", BCH_KDF_SCRYPT_N(crypt));
1142         pr_newline(out);
1143         pr_buf(out, "scrypt r:          %llu", BCH_KDF_SCRYPT_R(crypt));
1144         pr_newline(out);
1145         pr_buf(out, "scrypt p:          %llu", BCH_KDF_SCRYPT_P(crypt));
1146         pr_newline(out);
1147 }
1148
1149 static const struct bch_sb_field_ops bch_sb_field_ops_crypt = {
1150         .validate       = bch2_sb_crypt_validate,
1151         .to_text        = bch2_sb_crypt_to_text,
1152 };
1153
1154 /* BCH_SB_FIELD_clean: */
1155
1156 int bch2_sb_clean_validate_late(struct bch_fs *c, struct bch_sb_field_clean *clean, int write)
1157 {
1158         struct jset_entry *entry;
1159         int ret;
1160
1161         for (entry = clean->start;
1162              entry < (struct jset_entry *) vstruct_end(&clean->field);
1163              entry = vstruct_next(entry)) {
1164                 ret = bch2_journal_entry_validate(c, "superblock", entry,
1165                                                   le16_to_cpu(c->disk_sb.sb->version),
1166                                                   BCH_SB_BIG_ENDIAN(c->disk_sb.sb),
1167                                                   write);
1168                 if (ret)
1169                         return ret;
1170         }
1171
1172         return 0;
1173 }
1174
1175 int bch2_fs_mark_dirty(struct bch_fs *c)
1176 {
1177         int ret;
1178
1179         /*
1180          * Unconditionally write superblock, to verify it hasn't changed before
1181          * we go rw:
1182          */
1183
1184         mutex_lock(&c->sb_lock);
1185         SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
1186         c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALWAYS);
1187         c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
1188         ret = bch2_write_super(c);
1189         mutex_unlock(&c->sb_lock);
1190
1191         return ret;
1192 }
1193
1194 static struct jset_entry *jset_entry_init(struct jset_entry **end, size_t size)
1195 {
1196         struct jset_entry *entry = *end;
1197         unsigned u64s = DIV_ROUND_UP(size, sizeof(u64));
1198
1199         memset(entry, 0, u64s * sizeof(u64));
1200         /*
1201          * The u64s field counts from the start of data, ignoring the shared
1202          * fields.
1203          */
1204         entry->u64s = cpu_to_le16(u64s - 1);
1205
1206         *end = vstruct_next(*end);
1207         return entry;
1208 }
1209
1210 void bch2_journal_super_entries_add_common(struct bch_fs *c,
1211                                            struct jset_entry **end,
1212                                            u64 journal_seq)
1213 {
1214         struct bch_dev *ca;
1215         unsigned i, dev;
1216
1217         percpu_down_read(&c->mark_lock);
1218
1219         if (!journal_seq) {
1220                 for (i = 0; i < ARRAY_SIZE(c->usage); i++)
1221                         bch2_fs_usage_acc_to_base(c, i);
1222         } else {
1223                 bch2_fs_usage_acc_to_base(c, journal_seq & JOURNAL_BUF_MASK);
1224         }
1225
1226         {
1227                 struct jset_entry_usage *u =
1228                         container_of(jset_entry_init(end, sizeof(*u)),
1229                                      struct jset_entry_usage, entry);
1230
1231                 u->entry.type   = BCH_JSET_ENTRY_usage;
1232                 u->entry.btree_id = BCH_FS_USAGE_inodes;
1233                 u->v            = cpu_to_le64(c->usage_base->nr_inodes);
1234         }
1235
1236         {
1237                 struct jset_entry_usage *u =
1238                         container_of(jset_entry_init(end, sizeof(*u)),
1239                                      struct jset_entry_usage, entry);
1240
1241                 u->entry.type   = BCH_JSET_ENTRY_usage;
1242                 u->entry.btree_id = BCH_FS_USAGE_key_version;
1243                 u->v            = cpu_to_le64(atomic64_read(&c->key_version));
1244         }
1245
1246         for (i = 0; i < BCH_REPLICAS_MAX; i++) {
1247                 struct jset_entry_usage *u =
1248                         container_of(jset_entry_init(end, sizeof(*u)),
1249                                      struct jset_entry_usage, entry);
1250
1251                 u->entry.type   = BCH_JSET_ENTRY_usage;
1252                 u->entry.btree_id = BCH_FS_USAGE_reserved;
1253                 u->entry.level  = i;
1254                 u->v            = cpu_to_le64(c->usage_base->persistent_reserved[i]);
1255         }
1256
1257         for (i = 0; i < c->replicas.nr; i++) {
1258                 struct bch_replicas_entry *e =
1259                         cpu_replicas_entry(&c->replicas, i);
1260                 struct jset_entry_data_usage *u =
1261                         container_of(jset_entry_init(end, sizeof(*u) + e->nr_devs),
1262                                      struct jset_entry_data_usage, entry);
1263
1264                 u->entry.type   = BCH_JSET_ENTRY_data_usage;
1265                 u->v            = cpu_to_le64(c->usage_base->replicas[i]);
1266                 memcpy(&u->r, e, replicas_entry_bytes(e));
1267         }
1268
1269         for_each_member_device(ca, c, dev) {
1270                 unsigned b = sizeof(struct jset_entry_dev_usage) +
1271                         sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR;
1272                 struct jset_entry_dev_usage *u =
1273                         container_of(jset_entry_init(end, b),
1274                                      struct jset_entry_dev_usage, entry);
1275
1276                 u->entry.type = BCH_JSET_ENTRY_dev_usage;
1277                 u->dev = cpu_to_le32(dev);
1278                 u->buckets_ec           = cpu_to_le64(ca->usage_base->buckets_ec);
1279
1280                 for (i = 0; i < BCH_DATA_NR; i++) {
1281                         u->d[i].buckets = cpu_to_le64(ca->usage_base->d[i].buckets);
1282                         u->d[i].sectors = cpu_to_le64(ca->usage_base->d[i].sectors);
1283                         u->d[i].fragmented = cpu_to_le64(ca->usage_base->d[i].fragmented);
1284                 }
1285         }
1286
1287         percpu_up_read(&c->mark_lock);
1288
1289         for (i = 0; i < 2; i++) {
1290                 struct jset_entry_clock *clock =
1291                         container_of(jset_entry_init(end, sizeof(*clock)),
1292                                      struct jset_entry_clock, entry);
1293
1294                 clock->entry.type = BCH_JSET_ENTRY_clock;
1295                 clock->rw       = i;
1296                 clock->time     = cpu_to_le64(atomic64_read(&c->io_clock[i].now));
1297         }
1298 }
1299
1300 void bch2_fs_mark_clean(struct bch_fs *c)
1301 {
1302         struct bch_sb_field_clean *sb_clean;
1303         struct jset_entry *entry;
1304         unsigned u64s;
1305         int ret;
1306
1307         mutex_lock(&c->sb_lock);
1308         if (BCH_SB_CLEAN(c->disk_sb.sb))
1309                 goto out;
1310
1311         SET_BCH_SB_CLEAN(c->disk_sb.sb, true);
1312
1313         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_info);
1314         c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_metadata);
1315         c->disk_sb.sb->features[0] &= cpu_to_le64(~(1ULL << BCH_FEATURE_extents_above_btree_updates));
1316         c->disk_sb.sb->features[0] &= cpu_to_le64(~(1ULL << BCH_FEATURE_btree_updates_journalled));
1317
1318         u64s = sizeof(*sb_clean) / sizeof(u64) + c->journal.entry_u64s_reserved;
1319
1320         sb_clean = bch2_sb_resize_clean(&c->disk_sb, u64s);
1321         if (!sb_clean) {
1322                 bch_err(c, "error resizing superblock while setting filesystem clean");
1323                 goto out;
1324         }
1325
1326         sb_clean->flags         = 0;
1327         sb_clean->journal_seq   = cpu_to_le64(atomic64_read(&c->journal.seq));
1328
1329         /* Trying to catch outstanding bug: */
1330         BUG_ON(le64_to_cpu(sb_clean->journal_seq) > S64_MAX);
1331
1332         entry = sb_clean->start;
1333         bch2_journal_super_entries_add_common(c, &entry, 0);
1334         entry = bch2_btree_roots_to_journal_entries(c, entry, entry);
1335         BUG_ON((void *) entry > vstruct_end(&sb_clean->field));
1336
1337         memset(entry, 0,
1338                vstruct_end(&sb_clean->field) - (void *) entry);
1339
1340         /*
1341          * this should be in the write path, and we should be validating every
1342          * superblock section:
1343          */
1344         ret = bch2_sb_clean_validate_late(c, sb_clean, WRITE);
1345         if (ret) {
1346                 bch_err(c, "error writing marking filesystem clean: validate error");
1347                 goto out;
1348         }
1349
1350         bch2_write_super(c);
1351 out:
1352         mutex_unlock(&c->sb_lock);
1353 }
1354
1355 static int bch2_sb_clean_validate(struct bch_sb *sb,
1356                                   struct bch_sb_field *f,
1357                                   struct printbuf *err)
1358 {
1359         struct bch_sb_field_clean *clean = field_to_type(f, clean);
1360
1361         if (vstruct_bytes(&clean->field) < sizeof(*clean)) {
1362                 pr_buf(err, "wrong size (got %zu should be %zu)",
1363                        vstruct_bytes(&clean->field), sizeof(*clean));
1364                 return -EINVAL;
1365         }
1366
1367         return 0;
1368 }
1369
1370 static void bch2_sb_clean_to_text(struct printbuf *out, struct bch_sb *sb,
1371                                   struct bch_sb_field *f)
1372 {
1373         struct bch_sb_field_clean *clean = field_to_type(f, clean);
1374         struct jset_entry *entry;
1375
1376         pr_buf(out, "flags:          %x",       le32_to_cpu(clean->flags));
1377         pr_newline(out);
1378         pr_buf(out, "journal_seq:    %llu",     le64_to_cpu(clean->journal_seq));
1379         pr_newline(out);
1380
1381         for (entry = clean->start;
1382              entry != vstruct_end(&clean->field);
1383              entry = vstruct_next(entry)) {
1384                 if (entry->type == BCH_JSET_ENTRY_btree_keys &&
1385                     !entry->u64s)
1386                         continue;
1387
1388                 bch2_journal_entry_to_text(out, NULL, entry);
1389                 pr_newline(out);
1390         }
1391 }
1392
1393 static const struct bch_sb_field_ops bch_sb_field_ops_clean = {
1394         .validate       = bch2_sb_clean_validate,
1395         .to_text        = bch2_sb_clean_to_text,
1396 };
1397
1398 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
1399 #define x(f, nr)                                        \
1400         [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
1401         BCH_SB_FIELDS()
1402 #undef x
1403 };
1404
1405 static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
1406                                   struct printbuf *err)
1407 {
1408         unsigned type = le32_to_cpu(f->type);
1409         struct printbuf field_err = PRINTBUF;
1410         int ret;
1411
1412         if (type >= BCH_SB_FIELD_NR)
1413                 return 0;
1414
1415         ret = bch2_sb_field_ops[type]->validate(sb, f, &field_err);
1416         if (ret) {
1417                 pr_buf(err, "Invalid superblock section %s: %s",
1418                        bch2_sb_fields[type],
1419                        field_err.buf);
1420                 pr_newline(err);
1421                 bch2_sb_field_to_text(err, sb, f);
1422         }
1423
1424         printbuf_exit(&field_err);
1425         return ret;
1426 }
1427
1428 void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
1429                            struct bch_sb_field *f)
1430 {
1431         unsigned type = le32_to_cpu(f->type);
1432         const struct bch_sb_field_ops *ops = type < BCH_SB_FIELD_NR
1433                 ? bch2_sb_field_ops[type] : NULL;
1434
1435         if (!out->tabstops[0])
1436                 out->tabstops[0] = 32;
1437
1438         if (ops)
1439                 pr_buf(out, "%s", bch2_sb_fields[type]);
1440         else
1441                 pr_buf(out, "(unknown field %u)", type);
1442
1443         pr_buf(out, " (size %zu):", vstruct_bytes(f));
1444         pr_newline(out);
1445
1446         if (ops && ops->to_text) {
1447                 pr_indent_push(out, 2);
1448                 bch2_sb_field_ops[type]->to_text(out, sb, f);
1449                 pr_indent_pop(out, 2);
1450         }
1451 }
1452
1453 void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
1454 {
1455         unsigned i;
1456
1457         pr_buf(out, "Type:                    %u", l->layout_type);
1458         pr_newline(out);
1459
1460         pr_buf(out, "Superblock max size:     ");
1461         pr_units(out,
1462                  1 << l->sb_max_size_bits,
1463                  512 << l->sb_max_size_bits);
1464         pr_newline(out);
1465
1466         pr_buf(out, "Nr superblocks:          %u", l->nr_superblocks);
1467         pr_newline(out);
1468
1469         pr_buf(out, "Offsets:                 ");
1470         for (i = 0; i < l->nr_superblocks; i++) {
1471                 if (i)
1472                         pr_buf(out, ", ");
1473                 pr_buf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
1474         }
1475         pr_newline(out);
1476 }
1477
1478 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
1479                      bool print_layout, unsigned fields)
1480 {
1481         struct bch_sb_field_members *mi;
1482         struct bch_sb_field *f;
1483         u64 fields_have = 0;
1484         unsigned nr_devices = 0;
1485
1486         if (!out->tabstops[0])
1487                 out->tabstops[0] = 32;
1488
1489         mi = bch2_sb_get_members(sb);
1490         if (mi) {
1491                 struct bch_member *m;
1492
1493                 for (m = mi->members;
1494                      m < mi->members + sb->nr_devices;
1495                      m++)
1496                         nr_devices += bch2_member_exists(m);
1497         }
1498
1499         pr_buf(out, "External UUID:");
1500         pr_tab(out);
1501         pr_uuid(out, sb->user_uuid.b);
1502         pr_newline(out);
1503
1504         pr_buf(out, "Internal UUID:");
1505         pr_tab(out);
1506         pr_uuid(out, sb->uuid.b);
1507         pr_newline(out);
1508
1509         pr_buf(out, "Device index:");
1510         pr_tab(out);
1511         pr_buf(out, "%u", sb->dev_idx);
1512         pr_newline(out);
1513
1514         pr_buf(out, "Label:");
1515         pr_tab(out);
1516         pr_buf(out, "%.*s", (int) sizeof(sb->label), sb->label);
1517         pr_newline(out);
1518
1519         pr_buf(out, "Version:");
1520         pr_tab(out);
1521         pr_buf(out, "%s", bch2_metadata_versions[le16_to_cpu(sb->version)]);
1522         pr_newline(out);
1523
1524         pr_buf(out, "Oldest version on disk:");
1525         pr_tab(out);
1526         pr_buf(out, "%s", bch2_metadata_versions[le16_to_cpu(sb->version_min)]);
1527         pr_newline(out);
1528
1529         pr_buf(out, "Created:");
1530         pr_tab(out);
1531         if (sb->time_base_lo)
1532                 pr_time(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
1533         else
1534                 pr_buf(out, "(not set)");
1535         pr_newline(out);
1536
1537         pr_buf(out, "Sequence number:");
1538         pr_tab(out);
1539         pr_buf(out, "%llu", le64_to_cpu(sb->seq));
1540         pr_newline(out);
1541
1542         pr_buf(out, "Superblock size:");
1543         pr_tab(out);
1544         pr_buf(out, "%zu", vstruct_bytes(sb));
1545         pr_newline(out);
1546
1547         pr_buf(out, "Clean:");
1548         pr_tab(out);
1549         pr_buf(out, "%llu", BCH_SB_CLEAN(sb));
1550         pr_newline(out);
1551
1552         pr_buf(out, "Devices:");
1553         pr_tab(out);
1554         pr_buf(out, "%u", nr_devices);
1555         pr_newline(out);
1556
1557         pr_buf(out, "Sections:");
1558         vstruct_for_each(sb, f)
1559                 fields_have |= 1 << le32_to_cpu(f->type);
1560         pr_tab(out);
1561         bch2_flags_to_text(out, bch2_sb_fields, fields_have);
1562         pr_newline(out);
1563
1564         pr_buf(out, "Features:");
1565         pr_tab(out);
1566         bch2_flags_to_text(out, bch2_sb_features,
1567                            le64_to_cpu(sb->features[0]));
1568         pr_newline(out);
1569
1570         pr_buf(out, "Compat features:");
1571         pr_tab(out);
1572         bch2_flags_to_text(out, bch2_sb_compat,
1573                            le64_to_cpu(sb->compat[0]));
1574         pr_newline(out);
1575
1576         pr_newline(out);
1577         pr_buf(out, "Options:");
1578         pr_newline(out);
1579         pr_indent_push(out, 2);
1580         {
1581                 enum bch_opt_id id;
1582
1583                 for (id = 0; id < bch2_opts_nr; id++) {
1584                         const struct bch_option *opt = bch2_opt_table + id;
1585
1586                         if (opt->get_sb != BCH2_NO_SB_OPT) {
1587                                 u64 v = bch2_opt_from_sb(sb, id);
1588
1589                                 pr_buf(out, "%s:", opt->attr.name);
1590                                 pr_tab(out);
1591                                 bch2_opt_to_text(out, NULL, sb, opt, v,
1592                                                  OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
1593                                 pr_newline(out);
1594                         }
1595                 }
1596         }
1597
1598         pr_indent_pop(out, 2);
1599
1600         if (print_layout) {
1601                 pr_newline(out);
1602                 pr_buf(out, "layout:");
1603                 pr_newline(out);
1604                 pr_indent_push(out, 2);
1605                 bch2_sb_layout_to_text(out, &sb->layout);
1606                 pr_indent_pop(out, 2);
1607         }
1608
1609         vstruct_for_each(sb, f)
1610                 if (fields & (1 << le32_to_cpu(f->type))) {
1611                         pr_newline(out);
1612                         bch2_sb_field_to_text(out, sb, f);
1613                 }
1614 }