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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-12-18 14:49:38 +0900 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-01-02 11:10:35 -0600 |
| commit | 97ae77a1cd332c7b011d71315c8faabce6840c72 (patch) | |
| tree | fc243ca28ea474eaf81729079eeb3b259cd1b81b /block | |
| parent | 56c451f4b583ccdf80c9e676179c9cb49de86745 (diff) | |
| download | lwn-97ae77a1cd332c7b011d71315c8faabce6840c72.tar.gz lwn-97ae77a1cd332c7b011d71315c8faabce6840c72.zip | |
[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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-map.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/block/blk-map.c b/block/blk-map.c index c7e55b23a2bc..f103729b462f 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -42,7 +42,7 @@ static int __blk_rq_unmap_user(struct bio *bio) static int __blk_rq_map_user(struct request_queue *q, struct request *rq, struct rq_map_data *map_data, void __user *ubuf, - unsigned int len, int null_mapped, gfp_t gfp_mask) + unsigned int len, gfp_t gfp_mask) { unsigned long uaddr; struct bio *bio, *orig_bio; @@ -63,7 +63,7 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq, if (IS_ERR(bio)) return PTR_ERR(bio); - if (null_mapped) + if (map_data && map_data->null_mapped) bio->bi_flags |= (1 << BIO_NULL_MAPPED); orig_bio = bio; @@ -114,17 +114,15 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq, { unsigned long bytes_read = 0; struct bio *bio = NULL; - int ret, null_mapped = 0; + int ret; if (len > (q->max_hw_sectors << 9)) return -EINVAL; if (!len) return -EINVAL; - if (!ubuf) { - if (!map_data || rq_data_dir(rq) != READ) - return -EINVAL; - null_mapped = 1; - } + + if (!ubuf && (!map_data || !map_data->null_mapped)) + return -EINVAL; while (bytes_read != len) { unsigned long map_len, end, start; @@ -143,7 +141,7 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq, map_len -= PAGE_SIZE; ret = __blk_rq_map_user(q, rq, map_data, ubuf, map_len, - null_mapped, gfp_mask); + gfp_mask); if (ret < 0) goto unmap_rq; if (!bio) |