diff options
Diffstat (limited to 'fs/bcachefs/super-io.c')
| -rw-r--r-- | fs/bcachefs/super-io.c | 1353 |
1 files changed, 1353 insertions, 0 deletions
diff --git a/fs/bcachefs/super-io.c b/fs/bcachefs/super-io.c new file mode 100644 index 0000000000..4c98d8cc2a --- /dev/null +++ b/fs/bcachefs/super-io.c @@ -0,0 +1,1353 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "bcachefs.h" +#include "checksum.h" +#include "counters.h" +#include "disk_groups.h" +#include "ec.h" +#include "error.h" +#include "journal.h" +#include "journal_sb.h" +#include "journal_seq_blacklist.h" +#include "recovery.h" +#include "replicas.h" +#include "quota.h" +#include "sb-clean.h" +#include "sb-downgrade.h" +#include "sb-errors.h" +#include "sb-members.h" +#include "super-io.h" +#include "super.h" +#include "trace.h" +#include "vstructs.h" + +#include <linux/backing-dev.h> +#include <linux/sort.h> + +static const struct blk_holder_ops bch2_sb_handle_bdev_ops = { +}; + +struct bch2_metadata_version { + u16 version; + const char *name; + u64 recovery_passes; +}; + +static const struct bch2_metadata_version bch2_metadata_versions[] = { +#define x(n, v, _recovery_passes) { \ + .version = v, \ + .name = #n, \ + .recovery_passes = _recovery_passes, \ +}, + BCH_METADATA_VERSIONS() +#undef x +}; + +void bch2_version_to_text(struct printbuf *out, unsigned v) +{ + const char *str = "(unknown version)"; + + for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++) + if (bch2_metadata_versions[i].version == v) { + str = bch2_metadata_versions[i].name; + break; + } + + prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str); +} + +unsigned bch2_latest_compatible_version(unsigned v) +{ + if (!BCH_VERSION_MAJOR(v)) + return v; + + for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++) + if (bch2_metadata_versions[i].version > v && + BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) == + BCH_VERSION_MAJOR(v)) + v = bch2_metadata_versions[i].version; + + return v; +} + +u64 bch2_upgrade_recovery_passes(struct bch_fs *c, + unsigned old_version, + unsigned new_version) +{ + u64 ret = 0; + + for (const struct bch2_metadata_version *i = bch2_metadata_versions; + i < bch2_metadata_versions + ARRAY_SIZE(bch2_metadata_versions); + i++) + if (i->version > old_version && i->version <= new_version) { + if (i->recovery_passes & RECOVERY_PASS_ALL_FSCK) + ret |= bch2_fsck_recovery_passes(); + ret |= i->recovery_passes; + } + + return ret &= ~RECOVERY_PASS_ALL_FSCK; +} + +const char * const bch2_sb_fields[] = { +#define x(name, nr) #name, + BCH_SB_FIELDS() +#undef x + NULL +}; + +static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *, + struct printbuf *); + +struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb, + enum bch_sb_field_type type) +{ + struct bch_sb_field *f; + + /* XXX: need locking around superblock to access optional fields */ + + vstruct_for_each(sb, f) + if (le32_to_cpu(f->type) == type) + return f; + return NULL; +} + +static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb, + struct bch_sb_field *f, + unsigned u64s) +{ + unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0; + unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s; + + BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size); + + if (!f && !u64s) { + /* nothing to do: */ + } else if (!f) { + f = vstruct_last(sb->sb); + memset(f, 0, sizeof(u64) * u64s); + f->u64s = cpu_to_le32(u64s); + f->type = 0; + } else { + void *src, *dst; + + src = vstruct_end(f); + + if (u64s) { + f->u64s = cpu_to_le32(u64s); + dst = vstruct_end(f); + } else { + dst = f; + } + + memmove(dst, src, vstruct_end(sb->sb) - src); + + if (dst > src) + memset(src, 0, dst - src); + } + + sb->sb->u64s = cpu_to_le32(sb_u64s); + + return u64s ? f : NULL; +} + +void bch2_sb_field_delete(struct bch_sb_handle *sb, + enum bch_sb_field_type type) +{ + struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type); + + if (f) + __bch2_sb_field_resize(sb, f, 0); +} + +/* Superblock realloc/free: */ + +void bch2_free_super(struct bch_sb_handle *sb) +{ + kfree(sb->bio); + if (!IS_ERR_OR_NULL(sb->bdev)) + blkdev_put(sb->bdev, sb->holder); + kfree(sb->holder); + kfree(sb->sb_name); + + kfree(sb->sb); + memset(sb, 0, sizeof(*sb)); +} + +int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s) +{ + size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s); + size_t new_buffer_size; + struct bch_sb *new_sb; + struct bio *bio; + + if (sb->bdev) + new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev)); + + new_buffer_size = roundup_pow_of_two(new_bytes); + + if (sb->sb && sb->buffer_size >= new_buffer_size) + return 0; + + if (sb->sb && sb->have_layout) { + u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits; + + if (new_bytes > max_bytes) { + pr_err("%pg: superblock too big: want %zu but have %llu", + sb->bdev, new_bytes, max_bytes); + return -BCH_ERR_ENOSPC_sb; + } + } + + if (sb->buffer_size >= new_buffer_size && sb->sb) + return 0; + + if (dynamic_fault("bcachefs:add:super_realloc")) + return -BCH_ERR_ENOMEM_sb_realloc_injected; + + new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO); + if (!new_sb) + return -BCH_ERR_ENOMEM_sb_buf_realloc; + + sb->sb = new_sb; + + if (sb->have_bio) { + unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size); + + bio = bio_kmalloc(nr_bvecs, GFP_KERNEL); + if (!bio) + return -BCH_ERR_ENOMEM_sb_bio_realloc; + + bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0); + + kfree(sb->bio); + sb->bio = bio; + } + + sb->buffer_size = new_buffer_size; + + return 0; +} + +struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb, + enum bch_sb_field_type type, + unsigned u64s) +{ + struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type); + ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0; + ssize_t d = -old_u64s + u64s; + + if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d)) + return NULL; + + if (sb->fs_sb) { + struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb); + struct bch_dev *ca; + unsigned i; + + lockdep_assert_held(&c->sb_lock); + + /* XXX: we're not checking that offline device have enough space */ + + for_each_online_member(ca, c, i) { + struct bch_sb_handle *dev_sb = &ca->disk_sb; + + if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) { + percpu_ref_put(&ca->ref); + return NULL; + } + } + } + + f = bch2_sb_field_get_id(sb->sb, type); + f = __bch2_sb_field_resize(sb, f, u64s); + if (f) + f->type = cpu_to_le32(type); + return f; +} + +struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *sb, + enum bch_sb_field_type type, + unsigned u64s) +{ + struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type); + + if (!f || le32_to_cpu(f->u64s) < u64s) + f = bch2_sb_field_resize_id(sb, type, u64s); + return f; +} + +/* Superblock validate: */ + +static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out) +{ + u64 offset, prev_offset, max_sectors; + unsigned i; + + BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512); + + if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) && + !uuid_equal(&layout->magic, &BCHFS_MAGIC)) { + prt_printf(out, "Not a bcachefs superblock layout"); + return -BCH_ERR_invalid_sb_layout; + } + + if (layout->layout_type != 0) { + prt_printf(out, "Invalid superblock layout type %u", + layout->layout_type); + return -BCH_ERR_invalid_sb_layout_type; + } + + if (!layout->nr_superblocks) { + prt_printf(out, "Invalid superblock layout: no superblocks"); + return -BCH_ERR_invalid_sb_layout_nr_superblocks; + } + + if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) { + prt_printf(out, "Invalid superblock layout: too many superblocks"); + return -BCH_ERR_invalid_sb_layout_nr_superblocks; + } + + max_sectors = 1 << layout->sb_max_size_bits; + + prev_offset = le64_to_cpu(layout->sb_offset[0]); + + for (i = 1; i < layout->nr_superblocks; i++) { + offset = le64_to_cpu(layout->sb_offset[i]); + + if (offset < prev_offset + max_sectors) { + prt_printf(out, "Invalid superblock layout: superblocks overlap\n" + " (sb %u ends at %llu next starts at %llu", + i - 1, prev_offset + max_sectors, offset); + return -BCH_ERR_invalid_sb_layout_superblocks_overlap; + } + prev_offset = offset; + } + + return 0; +} + +static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out) +{ + u16 version = le16_to_cpu(sb->version); + u16 version_min = le16_to_cpu(sb->version_min); + + if (!bch2_version_compatible(version)) { + prt_str(out, "Unsupported superblock version "); + bch2_version_to_text(out, version); + prt_str(out, " (min "); + bch2_version_to_text(out, bcachefs_metadata_version_min); + prt_str(out, ", max "); + bch2_version_to_text(out, bcachefs_metadata_version_current); + prt_str(out, ")"); + return -BCH_ERR_invalid_sb_version; + } + + if (!bch2_version_compatible(version_min)) { + prt_str(out, "Unsupported superblock version_min "); + bch2_version_to_text(out, version_min); + prt_str(out, " (min "); + bch2_version_to_text(out, bcachefs_metadata_version_min); + prt_str(out, ", max "); + bch2_version_to_text(out, bcachefs_metadata_version_current); + prt_str(out, ")"); + return -BCH_ERR_invalid_sb_version; + } + + if (version_min > version) { + prt_str(out, "Bad minimum version "); + bch2_version_to_text(out, version_min); + prt_str(out, ", greater than version field "); + bch2_version_to_text(out, version); + return -BCH_ERR_invalid_sb_version; + } + + return 0; +} + +static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out, + int rw) +{ + struct bch_sb *sb = disk_sb->sb; + struct bch_sb_field *f; + struct bch_sb_field_members_v1 *mi; + enum bch_opt_id opt_id; + u16 block_size; + int ret; + + ret = bch2_sb_compatible(sb, out); + if (ret) + return ret; + + if (sb->features[1] || + (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) { + prt_printf(out, "Filesystem has incompatible features"); + return -BCH_ERR_invalid_sb_features; + } + + block_size = le16_to_cpu(sb->block_size); + + if (block_size > PAGE_SECTORS) { + prt_printf(out, "Block size too big (got %u, max %u)", + block_size, PAGE_SECTORS); + return -BCH_ERR_invalid_sb_block_size; + } + + if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) { + prt_printf(out, "Bad user UUID (got zeroes)"); + return -BCH_ERR_invalid_sb_uuid; + } + + if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) { + prt_printf(out, "Bad internal UUID (got zeroes)"); + return -BCH_ERR_invalid_sb_uuid; + } + + if (!sb->nr_devices || + sb->nr_devices > BCH_SB_MEMBERS_MAX) { + prt_printf(out, "Bad number of member devices %u (max %u)", + sb->nr_devices, BCH_SB_MEMBERS_MAX); + return -BCH_ERR_invalid_sb_too_many_members; + } + + if (sb->dev_idx >= sb->nr_devices) { + prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)", + sb->dev_idx, sb->nr_devices); + return -BCH_ERR_invalid_sb_dev_idx; + } + + if (!sb->time_precision || + le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) { + prt_printf(out, "Invalid time precision: %u (min 1, max %lu)", + le32_to_cpu(sb->time_precision), NSEC_PER_SEC); + return -BCH_ERR_invalid_sb_time_precision; + } + + if (rw == READ) { + /* + * Been seeing a bug where these are getting inexplicably + * zeroed, so we're now validating them, but we have to be + * careful not to preven people's filesystems from mounting: + */ + if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb)) + SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); + if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb)) + SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000); + + if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb)) + SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version)); + } + + for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) { + const struct bch_option *opt = bch2_opt_table + opt_id; + + if (opt->get_sb != BCH2_NO_SB_OPT) { + u64 v = bch2_opt_from_sb(sb, opt_id); + + prt_printf(out, "Invalid option "); + ret = bch2_opt_validate(opt, v, out); + if (ret) + return ret; + + printbuf_reset(out); + } + } + + /* validate layout */ + ret = validate_sb_layout(&sb->layout, out); + if (ret) + return ret; + + vstruct_for_each(sb, f) { + if (!f->u64s) { + prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)", + le32_to_cpu(f->type)); + return -BCH_ERR_invalid_sb_field_size; + } + + if (vstruct_next(f) > vstruct_last(sb)) { + prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)", + le32_to_cpu(f->type)); + return -BCH_ERR_invalid_sb_field_size; + } + } + + /* members must be validated first: */ + mi = bch2_sb_field_get(sb, members_v1); + if (!mi) { + prt_printf(out, "Invalid superblock: member info area missing"); + return -BCH_ERR_invalid_sb_members_missing; + } + + ret = bch2_sb_field_validate(sb, &mi->field, out); + if (ret) + return ret; + + vstruct_for_each(sb, f) { + if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1) + continue; + + ret = bch2_sb_field_validate(sb, f, out); + if (ret) + return ret; + } + + return 0; +} + +/* device open: */ + +static unsigned long le_ulong_to_cpu(unsigned long v) +{ + return sizeof(unsigned long) == 8 + ? le64_to_cpu(v) + : le32_to_cpu(v); +} + +static void le_bitvector_to_cpu(unsigned long *dst, unsigned long *src, unsigned nr) +{ + BUG_ON(nr & (BITS_PER_TYPE(long) - 1)); + + for (unsigned i = 0; i < BITS_TO_LONGS(nr); i++) + dst[i] = le_ulong_to_cpu(src[i]); +} + +static void bch2_sb_update(struct bch_fs *c) +{ + struct bch_sb *src = c->disk_sb.sb; + struct bch_dev *ca; + unsigned i; + + lockdep_assert_held(&c->sb_lock); + + c->sb.uuid = src->uuid; + c->sb.user_uuid = src->user_uuid; + c->sb.version = le16_to_cpu(src->version); + c->sb.version_min = le16_to_cpu(src->version_min); + c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src); + c->sb.nr_devices = src->nr_devices; + c->sb.clean = BCH_SB_CLEAN(src); + c->sb.encryption_type = BCH_SB_ENCRYPTION_TYPE(src); + + c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision); + c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit; + + /* XXX this is wrong, we need a 96 or 128 bit integer type */ + c->sb.time_base_lo = div_u64(le64_to_cpu(src->time_base_lo), + c->sb.nsec_per_time_unit); + c->sb.time_base_hi = le32_to_cpu(src->time_base_hi); + + c->sb.features = le64_to_cpu(src->features[0]); + c->sb.compat = le64_to_cpu(src->compat[0]); + + memset(c->sb.errors_silent, 0, sizeof(c->sb.errors_silent)); + + struct bch_sb_field_ext *ext = bch2_sb_field_get(src, ext); + if (ext) + le_bitvector_to_cpu(c->sb.errors_silent, (void *) ext->errors_silent, + sizeof(c->sb.errors_silent) * 8); + + for_each_member_device(ca, c, i) { + struct bch_member m = bch2_sb_member_get(src, ca->dev_idx); + ca->mi = bch2_mi_to_cpu(&m); + } +} + +static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src) +{ + struct bch_sb_field *src_f, *dst_f; + struct bch_sb *dst = dst_handle->sb; + unsigned i; + + dst->version = src->version; + dst->version_min = src->version_min; + dst->seq = src->seq; + dst->uuid = src->uuid; + dst->user_uuid = src->user_uuid; + memcpy(dst->label, src->label, sizeof(dst->label)); + + dst->block_size = src->block_size; + dst->nr_devices = src->nr_devices; + + dst->time_base_lo = src->time_base_lo; + dst->time_base_hi = src->time_base_hi; + dst->time_precision = src->time_precision; + + memcpy(dst->flags, src->flags, sizeof(dst->flags)); + memcpy(dst->features, src->features, sizeof(dst->features)); + memcpy(dst->compat, src->compat, sizeof(dst->compat)); + + for (i = 0; i < BCH_SB_FIELD_NR; i++) { + int d; + + if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS) + continue; + + src_f = bch2_sb_field_get_id(src, i); + dst_f = bch2_sb_field_get_id(dst, i); + + d = (src_f ? le32_to_cpu(src_f->u64s) : 0) - + (dst_f ? le32_to_cpu(dst_f->u64s) : 0); + if (d > 0) { + int ret = bch2_sb_realloc(dst_handle, + le32_to_cpu(dst_handle->sb->u64s) + d); + + if (ret) + return ret; + + dst = dst_handle->sb; + dst_f = bch2_sb_field_get_id(dst, i); + } + + dst_f = __bch2_sb_field_resize(dst_handle, dst_f, + src_f ? le32_to_cpu(src_f->u64s) : 0); + + if (src_f) + memcpy(dst_f, src_f, vstruct_bytes(src_f)); + } + + return 0; +} + +int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src) +{ + int ret; + + lockdep_assert_held(&c->sb_lock); + + ret = bch2_sb_realloc(&c->disk_sb, 0) ?: + __copy_super(&c->disk_sb, src) ?: + bch2_sb_replicas_to_cpu_replicas(c) ?: + bch2_sb_disk_groups_to_cpu(c); + if (ret) + return ret; + + bch2_sb_update(c); + return 0; +} + +int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca) +{ + return __copy_super(&ca->disk_sb, c->disk_sb.sb); +} + +/* read superblock: */ + +static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err) +{ + struct bch_csum csum; + size_t bytes; + int ret; +reread: + bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META); + sb->bio->bi_iter.bi_sector = offset; + bch2_bio_map(sb->bio, sb->sb, sb->buffer_size); + + ret = submit_bio_wait(sb->bio); + if (ret) { + prt_printf(err, "IO error: %i", ret); + return ret; + } + + if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) && + !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) { + prt_printf(err, "Not a bcachefs superblock"); + return -BCH_ERR_invalid_sb_magic; + } + + ret = bch2_sb_compatible(sb->sb, err); + if (ret) + return ret; + + bytes = vstruct_bytes(sb->sb); + + if (bytes > 512 << sb->sb->layout.sb_max_size_bits) { + prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)", + bytes, 512UL << sb->sb->layout.sb_max_size_bits); + return -BCH_ERR_invalid_sb_too_big; + } + + if (bytes > sb->buffer_size) { + ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s)); + if (ret) + return ret; + goto reread; + } + + if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) { + prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb)); + return -BCH_ERR_invalid_sb_csum_type; + } + + /* XXX: verify MACs */ + csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb), + null_nonce(), sb->sb); + + if (bch2_crc_cmp(csum, sb->sb->csum)) { + prt_printf(err, "bad checksum"); + return -BCH_ERR_invalid_sb_csum; + } + + sb->seq = le64_to_cpu(sb->sb->seq); + + return 0; +} + +int bch2_read_super(const char *path, struct bch_opts *opts, + struct bch_sb_handle *sb) +{ + u64 offset = opt_get(*opts, sb); + struct bch_sb_layout layout; + struct printbuf err = PRINTBUF; + __le64 *i; + int ret; +#ifndef __KERNEL__ +retry: +#endif + memset(sb, 0, sizeof(*sb)); + sb->mode = BLK_OPEN_READ; + sb->have_bio = true; + sb->holder = kmalloc(1, GFP_KERNEL); + if (!sb->holder) + return -ENOMEM; + + sb->sb_name = kstrdup(path, GFP_KERNEL); + if (!sb->sb_name) + return -ENOMEM; + +#ifndef __KERNEL__ + if (opt_get(*opts, direct_io) == false) + sb->mode |= BLK_OPEN_BUFFERED; +#endif + + if (!opt_get(*opts, noexcl)) + sb->mode |= BLK_OPEN_EXCL; + + if (!opt_get(*opts, nochanges)) + sb->mode |= BLK_OPEN_WRITE; + + sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops); + if (IS_ERR(sb->bdev) && + PTR_ERR(sb->bdev) == -EACCES && + opt_get(*opts, read_only)) { + sb->mode &= ~BLK_OPEN_WRITE; + + sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops); + if (!IS_ERR(sb->bdev)) + opt_set(*opts, nochanges, true); + } + + if (IS_ERR(sb->bdev)) { + ret = PTR_ERR(sb->bdev); + goto out; + } + + ret = bch2_sb_realloc(sb, 0); + if (ret) { + prt_printf(&err, "error allocating memory for superblock"); + goto err; + } + + if (bch2_fs_init_fault("read_super")) { + prt_printf(&err, "dynamic fault"); + ret = -EFAULT; + goto err; + } + + ret = read_one_super(sb, offset, &err); + if (!ret) + goto got_super; + + if (opt_defined(*opts, sb)) + goto err; + + printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s\n", + path, err.buf); + printbuf_reset(&err); + + /* + * Error reading primary superblock - read location of backup + * superblocks: + */ + bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META); + sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR; + /* + * use sb buffer to read layout, since sb buffer is page aligned but + * layout won't be: + */ + bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout)); + + ret = submit_bio_wait(sb->bio); + if (ret) { + prt_printf(&err, "IO error: %i", ret); + goto err; + } + + memcpy(&layout, sb->sb, sizeof(layout)); + ret = validate_sb_layout(&layout, &err); + if (ret) + goto err; + + for (i = layout.sb_offset; + i < layout.sb_offset + layout.nr_superblocks; i++) { + offset = le64_to_cpu(*i); + + if (offset == opt_get(*opts, sb)) + continue; + + ret = read_one_super(sb, offset, &err); + if (!ret) + goto got_super; + } + + goto err; + +got_super: + if (le16_to_cpu(sb->sb->block_size) << 9 < + bdev_logical_block_size(sb->bdev) && + opt_get(*opts, direct_io)) { +#ifndef __KERNEL__ + opt_set(*opts, direct_io, false); + bch2_free_super(sb); + goto retry; +#endif + prt_printf(&err, "block size (%u) smaller than device block size (%u)", + le16_to_cpu(sb->sb->block_size) << 9, + bdev_logical_block_size(sb->bdev)); + ret = -BCH_ERR_block_size_too_small; + goto err; + } + + ret = 0; + sb->have_layout = true; + + ret = bch2_sb_validate(sb, &err, READ); + if (ret) { + printk(KERN_ERR "bcachefs (%s): error validating superblock: %s\n", + path, err.buf); + goto err_no_print; + } +out: + printbuf_exit(&err); + return ret; +err: + printk(KERN_ERR "bcachefs (%s): error reading superblock: %s\n", + path, err.buf); +err_no_print: + bch2_free_super(sb); + goto out; +} + +/* write superblock: */ + +static void write_super_endio(struct bio *bio) +{ + struct bch_dev *ca = bio->bi_private; + + /* XXX: return errors directly */ + + if (bch2_dev_io_err_on(bio->bi_status, ca, + bio_data_dir(bio) + ? BCH_MEMBER_ERROR_write + : BCH_MEMBER_ERROR_read, + "superblock %s error: %s", + bio_data_dir(bio) ? "write" : "read", + bch2_blk_status_to_str(bio->bi_status))) + ca->sb_write_error = 1; + + closure_put(&ca->fs->sb_write); + percpu_ref_put(&ca->io_ref); +} + +static void read_back_super(struct bch_fs *c, struct bch_dev *ca) +{ + struct bch_sb *sb = ca->disk_sb.sb; + struct bio *bio = ca->disk_sb.bio; + + bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META); + bio->bi_iter.bi_sector = le64_to_cpu(sb->layout.sb_offset[0]); + bio->bi_end_io = write_super_endio; + bio->bi_private = ca; + bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE); + + this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb], + bio_sectors(bio)); + + percpu_ref_get(&ca->io_ref); + closure_bio_submit(bio, &c->sb_write); +} + +static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx) +{ + struct bch_sb *sb = ca->disk_sb.sb; + struct bio *bio = ca->disk_sb.bio; + + sb->offset = sb->layout.sb_offset[idx]; + + SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false)); + sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb), + null_nonce(), sb); + + bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META); + bio->bi_iter.bi_sector = le64_to_cpu(sb->offset); + bio->bi_end_io = write_super_endio; + bio->bi_private = ca; + bch2_bio_map(bio, sb, + roundup((size_t) vstruct_bytes(sb), + bdev_logical_block_size(ca->disk_sb.bdev))); + + this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb], + bio_sectors(bio)); + + percpu_ref_get(&ca->io_ref); + closure_bio_submit(bio, &c->sb_write); +} + +int bch2_write_super(struct bch_fs *c) +{ + struct closure *cl = &c->sb_write; + struct bch_dev *ca; + struct printbuf err = PRINTBUF; + unsigned i, sb = 0, nr_wrote; + struct bch_devs_mask sb_written; + bool wrote, can_mount_without_written, can_mount_with_written; + unsigned degraded_flags = BCH_FORCE_IF_DEGRADED; + int ret = 0; + + trace_and_count(c, write_super, c, _RET_IP_); + + if (c->opts.very_degraded) + degraded_flags |= BCH_FORCE_IF_LOST; + + lockdep_assert_held(&c->sb_lock); + + closure_init_stack(cl); + memset(&sb_written, 0, sizeof(sb_written)); + + /* Make sure we're using the new magic numbers: */ + c->disk_sb.sb->magic = BCHFS_MAGIC; + c->disk_sb.sb->layout.magic = BCHFS_MAGIC; + + le64_add_cpu(&c->disk_sb.sb->seq, 1); + + if (test_bit(BCH_FS_ERROR, &c->flags)) + SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1); + if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags)) + SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1); + + SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN); + + bch2_sb_counters_from_cpu(c); + bch2_sb_members_from_cpu(c); + bch2_sb_members_cpy_v2_v1(&c->disk_sb); + bch2_sb_errors_from_cpu(c); + bch2_sb_downgrade_update(c); + + for_each_online_member(ca, c, i) + bch2_sb_from_fs(c, ca); + + for_each_online_member(ca, c, i) { + printbuf_reset(&err); + + ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE); + if (ret) { + bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf); + percpu_ref_put(&ca->io_ref); + goto out; + } + } + + if (c->opts.nochanges) + goto out; + + /* + * Defer writing the superblock until filesystem initialization is + * complete - don't write out a partly initialized superblock: + */ + if (!BCH_SB_INITIALIZED(c->disk_sb.sb)) + goto out; + + for_each_online_member(ca, c, i) { + __set_bit(ca->dev_idx, sb_written.d); + ca->sb_write_error = 0; + } + + for_each_online_member(ca, c, i) + read_back_super(c, ca); + closure_sync(cl); + + for_each_online_member(ca, c, i) { + if (ca->sb_write_error) + continue; + + if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) { + bch2_fs_fatal_error(c, + "Superblock write was silently dropped! (seq %llu expected %llu)", + le64_to_cpu(ca->sb_read_scratch->seq), + ca->disk_sb.seq); + percpu_ref_put(&ca->io_ref); + ret = -BCH_ERR_erofs_sb_err; + goto out; + } + + if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) { + bch2_fs_fatal_error(c, + "Superblock modified by another process (seq %llu expected %llu)", + le64_to_cpu(ca->sb_read_scratch->seq), + ca->disk_sb.seq); + percpu_ref_put(&ca->io_ref); + ret = -BCH_ERR_erofs_sb_err; + goto out; + } + } + + do { + wrote = false; + for_each_online_member(ca, c, i) + if (!ca->sb_write_error && + sb < ca->disk_sb.sb->layout.nr_superblocks) { + write_one_super(c, ca, sb); + wrote = true; + } + closure_sync(cl); + sb++; + } while (wrote); + + for_each_online_member(ca, c, i) { + if (ca->sb_write_error) + __clear_bit(ca->dev_idx, sb_written.d); + else + ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq); + } + + nr_wrote = dev_mask_nr(&sb_written); + + can_mount_with_written = + bch2_have_enough_devs(c, sb_written, degraded_flags, false); + + for (i = 0; i < ARRAY_SIZE(sb_written.d); i++) + sb_written.d[i] = ~sb_written.d[i]; + + can_mount_without_written = + bch2_have_enough_devs(c, sb_written, degraded_flags, false); + + /* + * If we would be able to mount _without_ the devices we successfully + * wrote superblocks to, we weren't able to write to enough devices: + * + * Exception: if we can mount without the successes because we haven't + * written anything (new filesystem), we continue if we'd be able to + * mount with the devices we did successfully write to: + */ + if (bch2_fs_fatal_err_on(!nr_wrote || + !can_mount_with_written || + (can_mount_without_written && + !can_mount_with_written), c, + "Unable to write superblock to sufficient devices (from %ps)", + (void *) _RET_IP_)) + ret = -1; +out: + /* Make new options visible after they're persistent: */ + bch2_sb_update(c); + printbuf_exit(&err); + return ret; +} + +void __bch2_check_set_feature(struct bch_fs *c, unsigned feat) +{ + mutex_lock(&c->sb_lock); + if (!(c->sb.features & (1ULL << feat))) { + c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat); + + bch2_write_super(c); + } + mutex_unlock(&c->sb_lock); +} + +/* Downgrade if superblock is at a higher version than currently supported: */ +bool bch2_check_version_downgrade(struct bch_fs *c) +{ + bool ret = bcachefs_metadata_version_current < c->sb.version; + + lockdep_assert_held(&c->sb_lock); + + /* + * Downgrade, if superblock is at a higher version than currently + * supported: + */ + if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current) + SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current); + if (c->sb.version > bcachefs_metadata_version_current) + c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current); + if (c->sb.version_min > bcachefs_metadata_version_current) + c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current); + c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1); + return ret; +} + +void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version) +{ + lockdep_assert_held(&c->sb_lock); + + if (BCH_VERSION_MAJOR(new_version) > + BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version))) + bch2_sb_field_resize(&c->disk_sb, downgrade, 0); + + c->disk_sb.sb->version = cpu_to_le16(new_version); + c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL); +} + +static int bch2_sb_ext_validate(struct bch_sb *sb, struct bch_sb_field *f, + struct printbuf *err) +{ + if (vstruct_bytes(f) < 88) { + prt_printf(err, "field too small (%zu < %u)", vstruct_bytes(f), 88); + return -BCH_ERR_invalid_sb_ext; + } + + return 0; +} + +static void bch2_sb_ext_to_text(struct printbuf *out, struct bch_sb *sb, + struct bch_sb_field *f) +{ + struct bch_sb_field_ext *e = field_to_type(f, ext); + + prt_printf(out, "Recovery passes required:"); + prt_tab(out); + prt_bitflags(out, bch2_recovery_passes, + bch2_recovery_passes_from_stable(le64_to_cpu(e->recovery_passes_required[0]))); + prt_newline(out); + + unsigned long *errors_silent = kmalloc(sizeof(e->errors_silent), GFP_KERNEL); + if (errors_silent) { + le_bitvector_to_cpu(errors_silent, (void *) e->errors_silent, sizeof(e->errors_silent) * 8); + + prt_printf(out, "Errors to silently fix:"); + prt_tab(out); + prt_bitflags_vector(out, bch2_sb_error_strs, errors_silent, sizeof(e->errors_silent) * 8); + prt_newline(out); + + kfree(errors_silent); + } +} + +static const struct bch_sb_field_ops bch_sb_field_ops_ext = { + .validate = bch2_sb_ext_validate, + .to_text = bch2_sb_ext_to_text, +}; + +static const struct bch_sb_field_ops *bch2_sb_field_ops[] = { +#define x(f, nr) \ + [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f, + BCH_SB_FIELDS() +#undef x +}; + +static const struct bch_sb_field_ops bch2_sb_field_null_ops; + +static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type) +{ + return likely(type < ARRAY_SIZE(bch2_sb_field_ops)) + ? bch2_sb_field_ops[type] + : &bch2_sb_field_null_ops; +} + +static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f, + struct printbuf *err) +{ + unsigned type = le32_to_cpu(f->type); + struct printbuf field_err = PRINTBUF; + const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type); + int ret; + + ret = ops->validate ? ops->validate(sb, f, &field_err) : 0; + if (ret) { + prt_printf(err, "Invalid superblock section %s: %s", + bch2_sb_fields[type], field_err.buf); + prt_newline(err); + bch2_sb_field_to_text(err, sb, f); + } + + printbuf_exit(&field_err); + return ret; +} + +void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb, + struct bch_sb_field *f) +{ + unsigned type = le32_to_cpu(f->type); + const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type); + + if (!out->nr_tabstops) + printbuf_tabstop_push(out, 32); + + if (type < BCH_SB_FIELD_NR) + prt_printf(out, "%s", bch2_sb_fields[type]); + else + prt_printf(out, "(unknown field %u)", type); + + prt_printf(out, " (size %zu):", vstruct_bytes(f)); + prt_newline(out); + + if (ops->to_text) { + printbuf_indent_add(out, 2); + ops->to_text(out, sb, f); + printbuf_indent_sub(out, 2); + } +} + +void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l) +{ + unsigned i; + + prt_printf(out, "Type: %u", l->layout_type); + prt_newline(out); + + prt_str(out, "Superblock max size: "); + prt_units_u64(out, 512 << l->sb_max_size_bits); + prt_newline(out); + + prt_printf(out, "Nr superblocks: %u", l->nr_superblocks); + prt_newline(out); + + prt_str(out, "Offsets: "); + for (i = 0; i < l->nr_superblocks; i++) { + if (i) + prt_str(out, ", "); + prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i])); + } + prt_newline(out); +} + +void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb, + bool print_layout, unsigned fields) +{ + struct bch_sb_field *f; + u64 fields_have = 0; + unsigned nr_devices = 0; + + if (!out->nr_tabstops) + printbuf_tabstop_push(out, 44); + + for (int i = 0; i < sb->nr_devices; i++) + nr_devices += bch2_dev_exists(sb, i); + + prt_printf(out, "External UUID:"); + prt_tab(out); + pr_uuid(out, sb->user_uuid.b); + prt_newline(out); + + prt_printf(out, "Internal UUID:"); + prt_tab(out); + pr_uuid(out, sb->uuid.b); + prt_newline(out); + + prt_str(out, "Device index:"); + prt_tab(out); + prt_printf(out, "%u", sb->dev_idx); + prt_newline(out); + + prt_str(out, "Label:"); + prt_tab(out); + prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label); + prt_newline(out); + + prt_str(out, "Version:"); + prt_tab(out); + bch2_version_to_text(out, le16_to_cpu(sb->version)); + prt_newline(out); + + prt_str(out, "Version upgrade complete:"); + prt_tab(out); + bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb)); + prt_newline(out); + + prt_printf(out, "Oldest version on disk:"); + prt_tab(out); + bch2_version_to_text(out, le16_to_cpu(sb->version_min)); + prt_newline(out); + + prt_printf(out, "Created:"); + prt_tab(out); + if (sb->time_base_lo) + bch2_prt_datetime(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC)); + else + prt_printf(out, "(not set)"); + prt_newline(out); + + prt_printf(out, "Sequence number:"); + prt_tab(out); + prt_printf(out, "%llu", le64_to_cpu(sb->seq)); + prt_newline(out); + + prt_printf(out, "Superblock size:"); + prt_tab(out); + prt_printf(out, "%zu", vstruct_bytes(sb)); + prt_newline(out); + + prt_printf(out, "Clean:"); + prt_tab(out); + prt_printf(out, "%llu", BCH_SB_CLEAN(sb)); + prt_newline(out); + + prt_printf(out, "Devices:"); + prt_tab(out); + prt_printf(out, "%u", nr_devices); + prt_newline(out); + + prt_printf(out, "Sections:"); + vstruct_for_each(sb, f) + fields_have |= 1 << le32_to_cpu(f->type); + prt_tab(out); + prt_bitflags(out, bch2_sb_fields, fields_have); + prt_newline(out); + + prt_printf(out, "Features:"); + prt_tab(out); + prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0])); + prt_newline(out); + + prt_printf(out, "Compat features:"); + prt_tab(out); + prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0])); + prt_newline(out); + + prt_newline(out); + prt_printf(out, "Options:"); + prt_newline(out); + printbuf_indent_add(out, 2); + { + enum bch_opt_id id; + + for (id = 0; id < bch2_opts_nr; id++) { + const struct bch_option *opt = bch2_opt_table + id; + + if (opt->get_sb != BCH2_NO_SB_OPT) { + u64 v = bch2_opt_from_sb(sb, id); + + prt_printf(out, "%s:", opt->attr.name); + prt_tab(out); + bch2_opt_to_text(out, NULL, sb, opt, v, + OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST); + prt_newline(out); + } + } + } + + printbuf_indent_sub(out, 2); + + if (print_layout) { + prt_newline(out); + prt_printf(out, "layout:"); + prt_newline(out); + printbuf_indent_add(out, 2); + bch2_sb_layout_to_text(out, &sb->layout); + printbuf_indent_sub(out, 2); + } + + vstruct_for_each(sb, f) + if (fields & (1 << le32_to_cpu(f->type))) { + prt_newline(out); + bch2_sb_field_to_text(out, sb, f); + } +} |