TechPanelGM/kernel_xiaomi_sm8250
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

block: simplify and export blk_rq_append_bio

Browse Source 
The target SCSI passthrough backend is much better served with the low-level
blk_rq_append_bio construct then the helpers built on top of it, so export it.

Also use the opportunity to remove the pointless request_queue argument and
make the code flow a little more readable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2016-07-19 11:31:51 +02:00
committed by Jens Axboe
parent 0c4de0f33b
commit 98d61d5b1a
4 changed files with 17 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
block/blk-map.c
View File

@@ -9,21 +9,26 @@
#include "blk.h"
int blk_rq_append_bio(struct request_queue *q, struct request *rq,
struct bio *bio)
/*
* Append a bio to a passthrough request. Only works can be merged into
* the request based on the driver constraints.
*/
int blk_rq_append_bio(struct request *rq, struct bio *bio)
{
if (!rq->bio)
blk_rq_bio_prep(q, rq, bio);
else if (!ll_back_merge_fn(q, rq, bio))
return -EINVAL;
else {
if (!rq->bio) {
blk_rq_bio_prep(rq->q, rq, bio);
} else {
if (!ll_back_merge_fn(rq->q, rq, bio))
return -EINVAL;
rq->biotail->bi_next = bio;
rq->biotail = bio;
rq->__data_len += bio->bi_iter.bi_size;
}
return 0;
}
EXPORT_SYMBOL(blk_rq_append_bio);
static int __blk_rq_unmap_user(struct bio *bio)
{
@@ -71,7 +76,7 @@ static int __blk_rq_map_user_iov(struct request *rq,
*/
bio_get(bio);
ret = blk_rq_append_bio(q, rq, bio);
ret = blk_rq_append_bio(rq, bio);
if (ret) {
bio_endio(bio);
__blk_rq_unmap_user(orig_bio);
@@ -229,7 +234,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
if (do_copy)
rq->cmd_flags |= REQ_COPY_USER;
ret = blk_rq_append_bio(q, rq, bio);
ret = blk_rq_append_bio(rq, bio);
if (unlikely(ret)) {
/* request is too big */
bio_put(bio);