When joining a transaction with TRANS_JOIN_NOSTART, if we don't find a
running transaction we end up creating one. This goes against the purpose
of TRANS_JOIN_NOSTART which is to join a running transaction if its state
is at or below the state TRANS_STATE_COMMIT_START, otherwise return an
-ENOENT error and don't start a new transaction. So fix this to not create
a new transaction if there's no running transaction at or below that
state.
CC: stable@vger.kernel.org # 4.14+
Fixes:
a6d155d2e363 ("Btrfs: fix deadlock between fiemap and transaction commits")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
spin_unlock(&fs_info->trans_lock);
/*
- * If we are ATTACH, we just want to catch the current transaction,
- * and commit it. If there is no transaction, just return ENOENT.
+ * If we are ATTACH or TRANS_JOIN_NOSTART, we just want to catch the
+ * current transaction, and commit it. If there is no transaction, just
+ * return ENOENT.
*/
- if (type == TRANS_ATTACH)
+ if (type == TRANS_ATTACH || type == TRANS_JOIN_NOSTART)
return -ENOENT;
/*