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bcachefs: Check subvol <-> inode pointers in check_subvol() 

Subvolumes and subvolume root inodes point to each other: this verifies
the subvolume -> inode -> subvolme path.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-02-05 22:20:12 -05:00
parent 52946d828a
commit 4c20278eb1
3 changed files with 34 additions and 1 deletions
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2
fs/bcachefs/inode.c
View File

@ -324,7 +324,7 @@ int bch2_inode_unpack(struct bkey_s_c k,
return bch2_inode_unpack_slowpath(k, unpacked);
}
static int bch2_inode_peek_nowarn(struct btree_trans *trans,
int bch2_inode_peek_nowarn(struct btree_trans *trans,
struct btree_iter *iter,
struct bch_inode_unpacked *inode,
subvol_inum inum, unsigned flags)

2
fs/bcachefs/inode.h
View File

@ -95,6 +95,8 @@ struct bkey_i *bch2_inode_to_v3(struct btree_trans *, struct bkey_i *);
void bch2_inode_unpacked_to_text(struct printbuf *, struct bch_inode_unpacked *);
int bch2_inode_peek_nowarn(struct btree_trans *, struct btree_iter *,
struct bch_inode_unpacked *, subvol_inum, unsigned);
int bch2_inode_peek(struct btree_trans *, struct btree_iter *,
struct bch_inode_unpacked *, subvol_inum, unsigned);

31
fs/bcachefs/subvolume.c
View File

@ -42,6 +42,36 @@ static int check_subvol(struct btree_trans *trans,
return ret ?: -BCH_ERR_transaction_restart_nested;
}
struct bch_inode_unpacked inode;
struct btree_iter inode_iter = {};
ret = bch2_inode_peek_nowarn(trans, &inode_iter, &inode,
(subvol_inum) { k.k->p.offset, le64_to_cpu(subvol.v->inode) },
0);
bch2_trans_iter_exit(trans, &inode_iter);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (fsck_err_on(ret, c, subvol_to_missing_root,
"subvolume %llu points to missing subvolume root %llu:%u",
k.k->p.offset, le64_to_cpu(subvol.v->inode),
le32_to_cpu(subvol.v->snapshot))) {
ret = bch2_subvolume_delete(trans, iter->pos.offset);
bch_err_msg(c, ret, "deleting subvolume %llu", iter->pos.offset);
return ret ?: -BCH_ERR_transaction_restart_nested;
}
if (fsck_err_on(inode.bi_subvol != subvol.k->p.offset,
c, subvol_root_wrong_bi_subvol,
"subvol root %llu:%u has wrong bi_subvol field: got %u, should be %llu",
inode.bi_inum, inode_iter.k.p.snapshot,
inode.bi_subvol, subvol.k->p.offset)) {
inode.bi_subvol = subvol.k->p.offset;
ret = __bch2_fsck_write_inode(trans, &inode, le32_to_cpu(subvol.v->snapshot));
if (ret)
goto err;
}
if (!BCH_SUBVOLUME_SNAP(subvol.v)) {
u32 snapshot_root = bch2_snapshot_root(c, le32_to_cpu(subvol.v->snapshot));
u32 snapshot_tree;
@ -73,6 +103,7 @@ static int check_subvol(struct btree_trans *trans,
}
}
err:
fsck_err:
return ret;
}