From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 27 Dec 2014 04:58:21 +0000 (-0500)
Subject: ext4: prevent online resize with backup superblock
X-Git-Tag: fixes-v4.0-rc1~339^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=011fa99404bea3f5d897c4983f6bd51170e3b18f;p=pandora-kernel.git

ext4: prevent online resize with backup superblock

Prevent BUG or corrupted file systems after the following:

mkfs.ext4 /dev/vdc 100M
mount -t ext4 -o sb=40961 /dev/vdc /vdc
resize2fs /dev/vdc

We previously prevented online resizing using the old resize ioctl.
Move the code to ext4_resize_begin(), so the check applies for all of
the resize ioctl's.

Reported-by: Maxim Malkov <malkov@ispras.ru>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

Reading git-diff-tree failed