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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 <[email protected]>
Acked-by: Jens Axboe <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
FUJITA Tomonori 2008-12-18 14:49:38 +09:00 • committed by James Bottomley
commit 97ae77a1cd
4 changed files with 10 additions and 10 deletions
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2
fs/bio.c
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@ -859,7 +859,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
/*
* success
*/
if (!write_to_vm) {
if (!write_to_vm && (!map_data || !map_data->null_mapped)) {
ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0, 0);
if (ret)
goto cleanup;