From: Jan Kara <jack@suse.cz>
Date: Thu, 27 Sep 2012 01:52:20 +0000 (-0400)
Subject: ext4: fix fdatasync() for files with only i_size changes
X-Git-Tag: v3.7-rc1~91^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b71fc079b5d8f42b2a52743c8d2f1d35d655b1c5;p=pandora-kernel.git

ext4: fix fdatasync() for files with only i_size changes

Code tracking when transaction needs to be committed on fdatasync(2) forgets
to handle a situation when only inode's i_size is changed. Thus in such
situations fdatasync(2) doesn't force transaction with new i_size to disk
and that can result in wrong i_size after a crash.

Fix the issue by updating inode's i_datasync_tid whenever its size is
updated.

CC: <stable@vger.kernel.org> # >= 2.6.32
Reported-by: Kristian Nielsen <knielsen@knielsen-hq.org>
Signed-off-by: Jan Kara <jack@suse.cz>
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