quota: Fix WARN_ON in lookup_one_len
authorJan Kara <jack@suse.cz>
Thu, 12 Nov 2009 14:42:08 +0000 (15:42 +0100)
committerJan Kara <jack@suse.cz>
Thu, 10 Dec 2009 14:02:51 +0000 (15:02 +0100)
commitc56818d7dc976a7392be82e8e04fe26347d591f3
tree28c40dcb53198dc6870bb75b0250458579ade727
parent1472da5fdc65f0cd286c655758d629346001e126
quota: Fix WARN_ON in lookup_one_len

We should hold i_mutex when looking up quota files for journaled quotas,
otherwise a WARN_ON in lookup_one_len triggers. The fact that we didn't
hold i_mutex previously probably could not lead to a real bug since the
filesystem is just being mounted / remounted read-write and thus the
root directory cannot change anyway but it's definitely cleaner with
i_mutex.

Reported-by: Bastien ROUCARIES <roucaries.bastien@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
fs/quota/dquot.c