From: Chris Mason <chris.mason@oracle.com>
Date: Wed, 1 Feb 2012 01:19:02 +0000 (-0500)
Subject: Btrfs: don't use crc items bigger than 4KB
X-Git-Tag: v3.4-rc1~22^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ca4be45a0255ac8f08c05491c6add2dd87dd4f8;p=pandora-kernel.git

Btrfs: don't use crc items bigger than 4KB

With the big metadata blocks, we can have crc items
that are much bigger than a page.  There are a few
places that we try to kmalloc memory to hold the
items during a split.

Items bigger than 4KB don't really have a huge benefit
in efficiency, but they do trigger larger order allocations.
This commits changes the csums to make sure they stay under
4KB.  This is not a format change, just a #define to limit
huge items.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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