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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2009-05-17 18:55:18 +0300
committerJens Axboe <jens.axboe@oracle.com>2009-05-19 12:14:55 +0200
commit3a5a39276d2a32b05b1ee25b384516805b17cf87 (patch)
tree8a52a4a158ed341b7c3049826c549c2a210386e3 /block/blk-map.c
parentb2858d7d1639c04ca3c54988d76c5f7300b76f1c (diff)
downloadkernel-3a5a39276d2a32b05b1ee25b384516805b17cf87.tar.gz
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>
Diffstat (limited to 'block/blk-map.c')
-rw-r--r--block/blk-map.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index 56082bea4504..caa05a667743 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -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;