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block: factor out blk_rq_map_bio_alloc helper 

Move bio allocation logic from bio_map_user_iov to a new helper
blk_rq_map_bio_alloc. It is named so because functionality is opposite
of what is done inside blk_mq_map_bio_put. This is a prep patch.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20220930062749.152261-10-anuj20.g@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kanchan Joshi 2022-09-30 11:57:46 +05:30 committed by Jens Axboe
parent 32f1c71b15
commit ab89e8e7ca
1 changed files with 24 additions and 13 deletions
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37
block/blk-map.c
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@ -241,6 +241,27 @@ static void blk_mq_map_bio_put(struct bio *bio)
}
}
static struct bio *blk_rq_map_bio_alloc(struct request *rq,
unsigned int nr_vecs, gfp_t gfp_mask)
{
struct bio *bio;
if (rq->cmd_flags & REQ_POLLED) {
blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE;
bio = bio_alloc_bioset(NULL, nr_vecs, opf, gfp_mask,
&fs_bio_set);
if (!bio)
return NULL;
} else {
bio = bio_kmalloc(nr_vecs, gfp_mask);
if (!bio)
return NULL;
bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs, req_op(rq));
}
return bio;
}
static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
gfp_t gfp_mask)
{
@ -253,19 +274,9 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
if (!iov_iter_count(iter))
return -EINVAL;
if (rq->cmd_flags & REQ_POLLED) {
blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE;
bio = bio_alloc_bioset(NULL, nr_vecs, opf, gfp_mask,
&fs_bio_set);
if (!bio)
return -ENOMEM;
} else {
bio = bio_kmalloc(nr_vecs, gfp_mask);
if (!bio)
return -ENOMEM;
bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs, req_op(rq));
}
bio = blk_rq_map_bio_alloc(rq, nr_vecs, gfp_mask);
if (bio == NULL)
return -ENOMEM;
while (iov_iter_count(iter)) {
struct page **pages, *stack_pages[UIO_FASTIOV];