From: Jan Schmidt <list.btrfs@jan-o-sch.net>
Date: Thu, 16 Jun 2011 12:37:03 +0000 (+0200)
Subject: btrfs: Do not use bio->bi_bdev after submission
X-Git-Tag: v3.2-rc1~21^2~8^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1503140d3ec2be9b917d2f8f7c64cb77b79a215b;p=pandora-kernel.git

btrfs: Do not use bio->bi_bdev after submission

The block layer modifies bio->bi_bdev and bio->bi_sector while working on
the bio, they do _not_ come back unmodified in the completion callback.

To call add_page, we need at least some bi_bdev set, which is why the code
was working, previously. With this patch, we use the latest_bdev from
fsinfo instead of the leftover in the bio. This gives us the possibility to
use the bi_bdev field for another purpose.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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