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bcachefs: reconstruct_inode()

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If an inode is missing, but corresponding extents and dirent still
exist, it's well worth recreating it - this does so.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-04-01 00:00:56 -04:00
parent cc0532900b
commit 09d4c2acbf
1 changed files with 50 additions and 2 deletions
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52
fs/bcachefs/fsck.c
View file

@ -459,6 +459,33 @@ static int reconstruct_subvol(struct btree_trans *trans, u32 snapshotid, u32 sub
return 0;
}
static int reconstruct_inode(struct btree_trans *trans, u32 snapshot, u64 inum, u64 size, unsigned mode)
{
struct bch_fs *c = trans->c;
struct bch_inode_unpacked new_inode;
bch2_inode_init_early(c, &new_inode);
bch2_inode_init_late(&new_inode, bch2_current_time(c), 0, 0, mode|0755, 0, NULL);
new_inode.bi_size = size;
new_inode.bi_inum = inum;
return __bch2_fsck_write_inode(trans, &new_inode, snapshot);
}
static int reconstruct_reg_inode(struct btree_trans *trans, u32 snapshot, u64 inum)
{
struct btree_iter iter = {};
bch2_trans_iter_init(trans, &iter, BTREE_ID_extents, SPOS(inum, U64_MAX, snapshot), 0);
struct bkey_s_c k = bch2_btree_iter_peek_prev(&iter);
bch2_trans_iter_exit(trans, &iter);
int ret = bkey_err(k);
if (ret)
return ret;
return reconstruct_inode(trans, snapshot, inum, k.k->p.offset << 9, S_IFREG);
}
struct snapshots_seen_entry {
u32 id;
u32 equiv;
@ -1535,6 +1562,17 @@ static int check_extent(struct btree_trans *trans, struct btree_iter *iter,
goto err;
if (k.k->type != KEY_TYPE_whiteout) {
if (!i && (c->sb.btrees_lost_data & BIT_ULL(BTREE_ID_inodes))) {
ret = reconstruct_reg_inode(trans, k.k->p.snapshot, k.k->p.inode) ?:
bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
if (ret)
goto err;
inode->last_pos.inode--;
ret = -BCH_ERR_transaction_restart_nested;
goto err;
}
if (fsck_err_on(!i, c, extent_in_missing_inode,
"extent in missing inode:\n %s",
(printbuf_reset(&buf),
@ -2012,7 +2050,6 @@ static int check_dirent(struct btree_trans *trans, struct btree_iter *iter,
struct snapshots_seen *s)
{
struct bch_fs *c = trans->c;
struct bkey_s_c_dirent d;
struct inode_walker_entry *i;
struct printbuf buf = PRINTBUF;
struct bpos equiv;
@ -2051,6 +2088,17 @@ static int check_dirent(struct btree_trans *trans, struct btree_iter *iter,
*hash_info = bch2_hash_info_init(c, &dir->inodes.data[0].inode);
dir->first_this_inode = false;
if (!i && (c->sb.btrees_lost_data & BIT_ULL(BTREE_ID_inodes))) {
ret = reconstruct_inode(trans, k.k->p.snapshot, k.k->p.inode, 0, S_IFDIR) ?:
bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
if (ret)
goto err;
dir->last_pos.inode--;
ret = -BCH_ERR_transaction_restart_nested;
goto err;
}
if (fsck_err_on(!i, c, dirent_in_missing_dir_inode,
"dirent in nonexisting directory:\n%s",
(printbuf_reset(&buf),
@ -2085,7 +2133,7 @@ static int check_dirent(struct btree_trans *trans, struct btree_iter *iter,
if (k.k->type != KEY_TYPE_dirent)
goto out;
d = bkey_s_c_to_dirent(k);
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
if (d.v->d_type == DT_SUBVOL) {
ret = check_dirent_to_subvol(trans, iter, d);