From: Christoph Hellwig <hch@lst.de>
Date: Sun, 18 Jan 2015 15:16:30 +0000 (+0100)
Subject: block: add a helper to free bio bounce buffer pages
X-Git-Tag: fixes-v4.0-rc1~118^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1dfa0f68c040080c5fefa7211b4ec34d202f8570;p=pandora-kernel.git

block: add a helper to free bio bounce buffer pages

The code sniplet to walk all bio_vecs and free their pages is opencoded in
way to many places, so factor it into a helper.  Also convert the slightly
more complex cases in bio_kern_endio and __bio_copy_iov where we break
the freeing from an existing loop into a separate one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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