From: Chris Mason <clm@fb.com>
Date: Mon, 6 Apr 2015 14:48:20 +0000 (-0700)
Subject: Btrfs: don't use highmem for free space cache pages
X-Git-Tag: omap-for-v4.1/fixes-rc1~43^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b108268006e;p=pandora-kernel.git

Btrfs: don't use highmem for free space cache pages

In order to create the free space cache concurrently with FS modifications,
we need to take a few block group locks.

The cache code also does kmap, which would schedule with the locks held.
Instead of going through kmap_atomic, lets just use lowmem for the cache
pages.

Signed-off-by: Chris Mason <clm@fb.com>
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