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-rw-r--r--block/blk-map.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index 84b13a4158b7..d6ea377394a9 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -241,17 +241,10 @@ static void blk_mq_map_bio_put(struct bio *bio)
}
}
-static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
- gfp_t gfp_mask)
+static struct bio *blk_rq_map_bio_alloc(struct request *rq,
+ unsigned int nr_vecs, gfp_t gfp_mask)
{
- unsigned int max_sectors = queue_max_hw_sectors(rq->q);
- unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS);
struct bio *bio;
- int ret;
- int j;
-
- if (!iov_iter_count(iter))
- return -EINVAL;
if (rq->cmd_flags & REQ_POLLED) {
blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE;
@@ -259,13 +252,31 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
bio = bio_alloc_bioset(NULL, nr_vecs, opf, gfp_mask,
&fs_bio_set);
if (!bio)
- return -ENOMEM;
+ return NULL;
} else {
bio = bio_kmalloc(nr_vecs, gfp_mask);
if (!bio)
- return -ENOMEM;
+ 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)
+{
+ unsigned int max_sectors = queue_max_hw_sectors(rq->q);
+ unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS);
+ struct bio *bio;
+ int ret;
+ int j;
+
+ if (!iov_iter_count(iter))
+ return -EINVAL;
+
+ 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];