From: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
Extend blk_rq_map_user_iov so that it can handle bvec iterator, using
the new blk_rq_map_user_bvec function.
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
Signed-off-by: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxx>
---
block/blk-map.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/block/blk-map.c b/block/blk-map.c
index 023b63ad06d8..ffab5d2d8d6d 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -623,24 +623,35 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
struct rq_map_data *map_data,
const struct iov_iter *iter, gfp_t gfp_mask)
{
- bool copy = false;
+ bool copy = false, map_bvec = false;
unsigned long align = q->dma_pad_mask | queue_dma_alignment(q);
struct bio *bio = NULL;
struct iov_iter i;
int ret = -EINVAL;
- if (!iter_is_iovec(iter))
- goto fail;
-
if (map_data)
copy = true;
else if (blk_queue_may_bounce(q))
copy = true;
else if (iov_iter_alignment(iter) & align)
copy = true;
+ else if (iov_iter_is_bvec(iter))
+ map_bvec = true;
+ else if (!iter_is_iovec(iter))
+ copy = true;
else if (queue_virt_boundary(q))
copy = queue_virt_boundary(q) & iov_iter_gap_alignment(iter);
+ if (map_bvec) {
+ ret = blk_rq_map_user_bvec(rq, iter);
+ if (!ret)
+ return 0;
+ if (ret != -EREMOTEIO)
+ goto fail;
+ /* fall back to copying the data on limits mismatches */
+ copy = true;
+ }
+
i = *iter;
do {
if (copy)
--
2.25.1
