fix btrfs balance bug

PKGBUILD

@@ -5,7 +5,7 @@ pkgbase=linux               # Build stock -ARCH kernel
 #pkgbase=linux-custom       # Build kernel with a different name
 _srcname=linux-3.12
 pkgver=3.12.1
-pkgrel=1
+pkgrel=2
 arch=('i686' 'x86_64')
 url="http://www.kernel.org/"
 license=('GPL2')
@@ -18,14 +18,8 @@ source=("http://www.kernel.org/pub/linux/kernel/v3.x/${_srcname}.tar.xz"
         # standard config files for mkinitcpio ramdisk
         'linux.preset'
         'change-default-console-loglevel.patch'
-        'criu-no-expert.patch')
-md5sums=('cc6ee608854e0da4b64f6c1ff8b6398c'
-         '5a8cb5a659baeeb6df3fe22de8d32df6'
-         '798bca5d2f0a1505c9b86a5227a2b339'
-         '8fa6cbb28dda5a4b38730c7f728e1845'
-         'eb14dcfd80c00852ef81ded6e826826a'
-         '98beb36f9b8cf16e58de2483ea9985e3'
-         'd50c1ac47394e9aec637002ef3392bd1')
+        'criu-no-expert.patch'
+        '3.12-btrfs-relocate-csums.patch')
 
 _kernelname=${pkgbase#linux}
 
@@ -53,6 +47,11 @@ prepare() {
   # patch from fedora
   patch -Np1 -i "${srcdir}/criu-no-expert.patch"
 
+  # fix btrfs balance bug
+  # https://bugzilla.kernel.org/show_bug.cgi?id=63411
+  # https://bugs.archlinux.org/task/37867
+  patch -Np1 -i "${srcdir}/3.12-btrfs-relocate-csums.patch"
+
   if [ "${CARCH}" = "x86_64" ]; then
     cat "${srcdir}/config.x86_64" > ./.config
   else
@@ -333,3 +332,11 @@ for _p in ${pkgname[@]}; do
 done
 
 # vim:set ts=8 sts=2 sw=2 et:
+md5sums=('cc6ee608854e0da4b64f6c1ff8b6398c'
+         '5a8cb5a659baeeb6df3fe22de8d32df6'
+         '798bca5d2f0a1505c9b86a5227a2b339'
+         '8fa6cbb28dda5a4b38730c7f728e1845'
+         'eb14dcfd80c00852ef81ded6e826826a'
+         '98beb36f9b8cf16e58de2483ea9985e3'
+         'd50c1ac47394e9aec637002ef3392bd1'
+         '923c1728634d4e0f7b77177c36d94791')