[PATCH] Fix Issue: When VirtIO Backend providing VIRTIO_BLK_F_MQ feature, The file system of the front-end OS fails to be mounted.

[Lynch <lynch.wy@xxxxxxxxx>]

---
 drivers/vhost/blk.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/blk.c b/drivers/vhost/blk.c
index 44fbf253e773..0e946d9dfc33 100644
--- a/drivers/vhost/blk.c
+++ b/drivers/vhost/blk.c
@@ -251,6 +251,7 @@ static int vhost_blk_bio_make(struct vhost_blk_req *req,
 	struct page **pages, *page;
 	struct bio *bio = NULL;
 	int bio_nr = 0;
+	sector_t sector_tmp;
 
 	if (unlikely(req->bi_opf == REQ_OP_FLUSH))
 		return vhost_blk_bio_make_simple(req, bdev);
@@ -270,6 +271,7 @@ static int vhost_blk_bio_make(struct vhost_blk_req *req,
 		req->bio = req->inline_bio;
 	}
 
+	sector_tmp = req->sector;
 	req->iov_nr = 0;
 	for (i = 0; i < iov_nr; i++) {
 		int pages_nr = iov_num_pages(&iov[i]);
@@ -302,7 +304,7 @@ static int vhost_blk_bio_make(struct vhost_blk_req *req,
 				bio = bio_alloc(GFP_KERNEL, pages_nr_total);
 				if (!bio)
 					goto fail;
-				bio->bi_iter.bi_sector  = req->sector;
+				bio->bi_iter.bi_sector  = sector_tmp;
 				bio_set_dev(bio, bdev);
 				bio->bi_private = req;
 				bio->bi_end_io  = vhost_blk_req_done;
@@ -314,7 +316,7 @@ static int vhost_blk_bio_make(struct vhost_blk_req *req,
 			iov_len		-= len;
 
 			pos = (iov_base & VHOST_BLK_SECTOR_MASK) + iov_len;
-			req->sector += pos >> VHOST_BLK_SECTOR_BITS;
+			sector_tmp += pos >> VHOST_BLK_SECTOR_BITS;
 		}
 
 		pages += pages_nr;
-- 
2.25.1