From: Tejun Heo <tj@kernel.org>
Date: Wed, 15 Apr 2009 13:10:24 +0000 (+0900)
Subject: block: fix SG_IO vector request data length handling
X-Git-Tag: v2.6.30-rc4~65^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25636e282fe95508cae96bb27f86407aef935817;p=pandora-kernel.git

block: fix SG_IO vector request data length handling

Impact: fix SG_IO behavior such that it matches the documentation

SG_IO howto says that if ->dxfer_len and sum of iovec disagress, the
shorter one wins.  However, the current implementation returns -EINVAL
for such cases.  Trim iovc if it's longer than ->dxfer_len.

This patch uses iov_*() helpers which take struct iovec * by casting
struct sg_iovec * to it.  sg_iovec is always identical to iovec and
this will be further cleaned up with later patches.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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