From: Josef Bacik <josef@redhat.com>
Date: Sat, 20 Aug 2011 12:29:51 +0000 (-0400)
Subject: Btrfs: fix 64 bit divide problem
X-Git-Tag: v3.1-rc3~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6719db6a23d4b7f1e5052eedae394135e3aef9c1;p=pandora-kernel.git

Btrfs: fix 64 bit divide problem

This fixes a regression introduced by commit cdcb725c05fe ("Btrfs: check
if there is enough space for balancing smarter").  We can't do 64-bit
divides on 32-bit architectures.

In cases where we need to divide/multiply by 2 we should just left/right
shift respectively, and in cases where theres N number of devices use
do_div.  Also make the counters u64 to match up with rw_devices.
Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Acked-and-tested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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