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bcachefs: Validate that we read the correct btree node

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Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-05-12 18:34:16 -04:00 committed by Kent Overstreet
parent a9310ab06c
commit f36dff2885
1 changed files with 11 additions and 0 deletions
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11
fs/bcachefs/btree_io.c
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@ -736,6 +736,17 @@ static int validate_bset(struct bch_fs *c, struct btree *b,
struct btree_node *bn =
container_of(i, struct btree_node, keys);
/* These indicate that we read the wrong btree node: */
if (b->key.k.type == KEY_TYPE_btree_ptr_v2) {
struct bch_btree_ptr_v2 *bp =
&bkey_i_to_btree_ptr_v2(&b->key)->v;
/* XXX endianness */
btree_err_on(bp->seq != bn->keys.seq,
BTREE_ERR_MUST_RETRY, c, b, NULL,
"incorrect sequence number (wrong btree node)");
}
btree_err_on(BTREE_NODE_ID(bn) != b->c.btree_id,
BTREE_ERR_MUST_RETRY, c, b, i,
"incorrect btree id");