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

[Andrey Zhadchenko]

Hi

Thank you for the patch.
vhost-blk didn't spark enough interest to be reviewed and merged into 
the upstream and the code is not present here.
I have forwarded your patch to relevant openvz kernel mailing list.
On 5/17/24 07:34, Lynch wrote:
---
  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;