tree fc243ca28ea474eaf81729079eeb3b259cd1b81b
parent 56c451f4b583ccdf80c9e676179c9cb49de86745
author FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> 1229579378 +0900
committer James Bottomley <James.Bottomley@HansenPartnership.com> 1230916235 -0600

[SCSI] block: make blk_rq_map_user take a NULL user-space buffer for WRITE

The commit 818827669d85b84241696ffef2de485db46b0b5e (block: make
blk_rq_map_user take a NULL user-space buffer) extended
blk_rq_map_user to accept a NULL user-space buffer with a READ
command. It was necessary to convert sg to use the block layer mapping
API.

This patch extends blk_rq_map_user again for a WRITE command. It is
necessary to convert st and osst drivers to use the block layer
apping API.

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>