From: Peng Tao <bergwolf@gmail.com>
Date: Tue, 11 Aug 2009 03:05:28 +0000 (-0400)
Subject: ext4: fix journal ref count in move_extent_par_page
X-Git-Tag: v2.6.32-rc1~633^2~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91cc219ad963731191247c5f2db4118be2bc341a;p=pandora-kernel.git

ext4: fix journal ref count in move_extent_par_page

move_extent_par_page calls a_ops->write_begin() to increase journal
handler's reference count. However, if either mext_replace_branches()
or ext4_get_block fails, the increased reference count isn't
decreased. This will cause a later attempt to umount of the fs to hang
forever. The patch addresses the issue by calling ext4_journal_stop()
if page is not NULL (which means a_ops->write_end() isn't invoked).

Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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