From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 16 Feb 2014 03:42:25 +0000 (-0500)
Subject: ext4: fix online resize with a non-standard blocks per group setting
X-Git-Tag: v3.14-rc4~33^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3d2660d0c9c2f296837078c189b68a47f6b2e3b5;p=pandora-kernel.git

ext4: fix online resize with a non-standard blocks per group setting

The set_flexbg_block_bitmap() function assumed that the number of
blocks in a blockgroup was sb->blocksize * 8, which is normally true,
but not always!  Use EXT4_BLOCKS_PER_GROUP(sb) instead, to fix block
bitmap corruption after:

mke2fs -t ext4 -g 3072 -i 4096 /dev/vdd 1G
mount -t ext4 /dev/vdd /vdd
resize2fs /dev/vdd 8G

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Jon Bernard <jbernard@tuxion.com>
Cc: stable@vger.kernel.org
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