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block: allow blk_rq_map_kern to append to requests 

Use blk_rq_append_bio() internally instead of blk_rq_bio_prep()
so blk_rq_map_kern can be called multiple times, to map multiple
buffers.

This is in the effort to un-export blk_rq_append_bio()

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
James Bottomley 2009-05-17 18:55:18 +03:00 committed by Jens Axboe
parent b2858d7d16
commit 3a5a39276d
1 changed files with 10 additions and 2 deletions
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12
block/blk-map.c
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@ -282,7 +282,8 @@ EXPORT_SYMBOL(blk_rq_unmap_user);
*
* Description:
* Data will be mapped directly if possible. Otherwise a bounce
* buffer is used.
* buffer is used. Can be called multple times to append multple
* buffers.
*/
int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
unsigned int len, gfp_t gfp_mask)
@ -290,6 +291,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
int reading = rq_data_dir(rq) == READ;
int do_copy = 0;
struct bio *bio;
int ret;
if (len > (q->max_hw_sectors << 9))
return -EINVAL;
@ -311,7 +313,13 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
if (do_copy)
rq->cmd_flags |= REQ_COPY_USER;
blk_rq_bio_prep(q, rq, bio);
ret = blk_rq_append_bio(q, rq, bio);
if (unlikely(ret)) {
/* request is too big */
bio_put(bio);
return ret;
}
blk_queue_bounce(q, &rq->bio);
rq->buffer = NULL;
return 0;