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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
This commit is contained in:
Theodore Ts'o 2012-12-27 01:42:48 -05:00
parent d096ad0f79
commit 721e3eba21
1 changed files with 2 additions and 0 deletions
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2
fs/ext4/super.c
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@ -2220,7 +2220,9 @@ static void ext4_orphan_cleanup(struct super_block *sb,
__func__, inode->i_ino, inode->i_size); __func__, inode->i_ino, inode->i_size);
jbd_debug(2, "truncating inode %lu to %lld bytes\n", jbd_debug(2, "truncating inode %lu to %lld bytes\n",
inode->i_ino, inode->i_size); inode->i_ino, inode->i_size);
mutex_lock(&inode->i_mutex);
ext4_truncate(inode); ext4_truncate(inode);
mutex_unlock(&inode->i_mutex);
nr_truncates++; nr_truncates++;
} else { } else {
ext4_msg(sb, KERN_DEBUG, ext4_msg(sb, KERN_DEBUG,