From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Mon, 17 Mar 2008 15:15:03 +0000 (+0900)
Subject: [SCSI] block: add sg buffer copy helper functions
X-Git-Tag: v2.6.26-rc1~1140^2~112
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1adaf65ba0398c9a1adc8f3a274533165a4df61;p=pandora-kernel.git

[SCSI] block: add sg buffer copy helper functions

This patch adds new three helper functions to copy data between an SG
list and a linear buffer.

- sg_copy_from_buffer copies data from linear buffer to an SG list

- sg_copy_to_buffer copies data from an SG list to a linear buffer

When the APIs copy data from a linear buffer to an SG list,
flush_kernel_dcache_page is called. It's not necessary for everyone
but it's a no-op on most architectures and in general the API is not
used in performance critical path.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---

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