From: Li Zefan <lizf@cn.fujitsu.com>
Date: Thu, 1 Dec 2011 04:55:47 +0000 (+0800)
Subject: Btrfs: don't pre-allocate btrfs bio
X-Git-Tag: v3.3-rc1~26^2~11^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de11cc12df17337979e0929d2831887432f236ca;p=pandora-kernel.git

Btrfs: don't pre-allocate btrfs bio

We pre-allocate a btrfs bio with fixed size, and then may re-allocate
memory if we find stripes are bigger than the fixed size. But this
pre-allocation is not necessary.

Also we don't have to calcuate the stripe number twice.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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