korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-26 13:44:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

block: use iter_ubuf for single range

Browse Source 
This is more efficient than iter_iov.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[axboe: fold in iovec assumption fix]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2023-01-05 11:07:34 -08:00 committed by Jens Axboe
parent 4397a17c1d
commit d46aa786fa
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
block/blk-map.c
View File

@ -31,7 +31,8 @@ static struct bio_map_data *bio_alloc_map_data(struct iov_iter *data,
return NULL;
memcpy(bmd->iov, data->iov, sizeof(struct iovec) * data->nr_segs);
bmd->iter = *data;
bmd->iter.iov = bmd->iov;
if (iter_is_iovec(data))
bmd->iter.iov = bmd->iov;
return bmd;
}
@ -641,7 +642,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
copy = true;
else if (iov_iter_is_bvec(iter))
map_bvec = true;
else if (!iter_is_iovec(iter))
else if (!user_backed_iter(iter))
copy = true;
else if (queue_virt_boundary(q))
copy = queue_virt_boundary(q) & iov_iter_gap_alignment(iter);
@ -682,9 +683,8 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
struct rq_map_data *map_data, void __user *ubuf,
unsigned long len, gfp_t gfp_mask)
{
struct iovec iov;
struct iov_iter i;
int ret = import_single_range(rq_data_dir(rq), ubuf, len, &iov, &i);
int ret = import_ubuf(rq_data_dir(rq), ubuf, len, &i);
if (unlikely(ret < 0))
return ret;