From: Lukas Czerner <lczerner@redhat.com>
Date: Mon, 18 Feb 2013 17:12:07 +0000 (-0500)
Subject: ext4: fix xattr block allocation/release with bigalloc
X-Git-Tag: v3.9-rc1~64^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1231b3a1eb5740192aeebf5344dd6d6da000febf;p=pandora-kernel.git

ext4: fix xattr block allocation/release with bigalloc

Currently when new xattr block is created or released we we would call
dquot_free_block() or dquot_alloc_block() respectively, among the else
decrementing or incrementing the number of blocks assigned to the
inode by one block.

This however does not work for bigalloc file system because we always
allocate/free the whole cluster so we have to count with that in
dquot_free_block() and dquot_alloc_block() as well.

Use the clusters-to-blocks conversion EXT4_C2B() when passing number of
blocks to the dquot_alloc/free functions to fix the problem.

The problem has been revealed by xfstests #117 (and possibly others).

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Cc: stable@vger.kernel.org
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