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| author | Theodore Ts'o <tytso@mit.edu> | 2012-12-27 01:42:48 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:46:23 -0800 |
| commit | ab9f12650d4b035cf2e1e72fbb9cda45ed96b08c (patch) | |
| tree | 255b2e1afa14569ce917a14602815de20d62f170 | |
| parent | 764df5435c448302d14c1fff0d80bf7af8aa5289 (diff) | |
| download | lwn-ab9f12650d4b035cf2e1e72fbb9cda45ed96b08c.tar.gz lwn-ab9f12650d4b035cf2e1e72fbb9cda45ed96b08c.zip | |
ext4: lock i_mutex when truncating orphan inodes
commit 721e3eba21e43532e438652dd8f1fcdfce3187e7 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ext4/super.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index ab6157ba0cbc..d59b35160ada 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2225,7 +2225,9 @@ static void ext4_orphan_cleanup(struct super_block *sb, __func__, inode->i_ino, inode->i_size); jbd_debug(2, "truncating inode %lu to %lld bytes\n", inode->i_ino, inode->i_size); + mutex_lock(&inode->i_mutex); ext4_truncate(inode); + mutex_unlock(&inode->i_mutex); nr_truncates++; } else { ext4_msg(sb, KERN_DEBUG, |