ext4__truncate_inode_pages()_in_orphan_cleanup_path

   1 ext4: truncate_inode_pages() in orphan cleanup path
   2
   3 From: Lukas Czerner <lczerner@redhat.com>
   4
   5 Currently we do not tell mm to zero out tail of the page before truncate
   6 in orphan_cleanup(). This is ok, because the page should not be
   7 uptodate, however this may eventually change and I might cause problems.
   8
   9 Call truncate_inode_pages() as precautionary measure. Thanks Jan Kara
  10 for pointing this out.
  11
  12 Signed-off-by: Lukas Czerner <lczerner@redhat.com>
  13 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  14
  15 diff --git a/fs/ext4/super.c b/fs/ext4/super.c
  16 index 94cc84d..c468560 100644
  17 --- a/fs/ext4/super.c
  18 +++ b/fs/ext4/super.c
  19 @@ -2170,6 +2170,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
  20                         jbd_debug(2, "truncating inode %lu to %lld bytes\n",
  21                                   inode->i_ino, inode->i_size);
  22                         mutex_lock(&inode->i_mutex);
  23 +                       truncate_inode_pages(inode->i_mapping, inode->i_size);
  24                         ext4_truncate(inode);
  25                         mutex_unlock(&inode->i_mutex);
  26                         nr_truncates++;