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

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The commit 818827669d (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>
This commit is contained in:
FUJITA Tomonori
2008-12-18 14:49:38 +09:00
committed by James Bottomley
parent 56c451f4b5
commit 97ae77a1cd
4 changed files with 10 additions and 10 deletions
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include/linux/blkdev.h
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@ -691,6 +691,7 @@ struct rq_map_data {
int page_order;
int nr_entries;
unsigned long offset;
int null_mapped;
};
struct req_iterator {