tree 9561105270aeec6e9c28fc3cbb430040a5be6ca7
parent dda54df863232231ce851045834f475f02a7e565
author Yongqiang Yang <xiaoqiangnk@gmail.com> 1323831115 -0500
committer Greg Kroah-Hartman <gregkh@suse.de> 1324501064 -0800

ext4: avoid potential hang in mpage_submit_io() when blocksize < pagesize

commit 13a79a4741d37fda2fbafb953f0f301dc007928f upstream.

If there is an unwritten but clean buffer in a page and there is a
dirty buffer after the buffer, then mpage_submit_io does not write the
dirty buffer out.  As a result, da_writepages loops forever.

This patch fixes the problem by checking dirty flag.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>