From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Mon, 25 Aug 2008 18:36:08 +0000 (+0200)
Subject: bio: fix bio_copy_kern() handling of bio->bv_len
X-Git-Tag: v2.6.27-rc5~19^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76029ff37f31dad64641489c610d98955217bb68;p=pandora-kernel.git

bio: fix bio_copy_kern() handling of bio->bv_len

The commit 68154e90c9d1492d570671ae181d9a8f8530da55 introduced
bio_copy_kern() to add bounce support to blk_rq_map_kern.

bio_copy_kern() uses bio->bv_len to copy data for READ commands after
the completion but it doesn't work with a request that partially
completed. SCSI always completes a PC request as a whole but seems
some don't.

This patch fixes bio_copy_kern to handle the above case. As
bio_copy_user does, bio_copy_kern uses struct bio_map_data to store
struct bio_vec.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reported-by: Nix <nix@esperi.org.uk>
Tested-by: Nix <nix@esperi.org.uk>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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