ext4: lock i_mutex when truncating orphan inodes
authorTheodore Ts'o <tytso@mit.edu>
Thu, 27 Dec 2012 06:42:48 +0000 (01:42 -0500)
committerTheodore Ts'o <tytso@mit.edu>
Thu, 27 Dec 2012 06:42:48 +0000 (01:42 -0500)
commit721e3eba21e43532e438652dd8f1fcdfce3187e7
tree5d1d118d6b671b98edbeabee15e15869305d129f
parentd096ad0f79a782935d2e06ae8fb235e8c5397775
ext4: lock i_mutex when truncating orphan inodes

Commit c278531d39 added a warning when ext4_flush_unwritten_io() is
called without i_mutex being taken.  It had previously not been taken
during orphan cleanup since races weren't possible at that point in
the mount process, but as a result of this c278531d39, we will now see
a kernel WARN_ON in this case.  Take the i_mutex in
ext4_orphan_cleanup() to suppress this warning.

Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Cc: stable@vger.kernel.org
fs/ext4/super.c