[Qemu-devel] [PATCHv2 4/6] hw/virtio-blk: add a constant for max number of merged requests

[Peter Lieven]

As it was not obvious (at least for me) where the 32 comes from;
add a constant for it.

Signed-off-by: Peter Lieven <p...@kamp.de>
Reviewed-by: Max Reitz <mre...@redhat.com>
---
 hw/block/virtio-blk.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 1fa9770..555bcea 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -306,6 +306,8 @@ static bool virtio_blk_sect_range_ok(VirtIOBlock *dev,
     return true;
 }
 
+#define MAX_MERGE_REQS 32
+
 static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb)
 {
     BlockRequest *blkreq;
@@ -324,7 +326,7 @@ static void virtio_blk_handle_write(VirtIOBlockReq *req, 
MultiReqBuffer *mrb)
     block_acct_start(bdrv_get_stats(req->dev->bs), &req->acct, req->qiov.size,
                      BLOCK_ACCT_WRITE);
 
-    if (mrb->num_writes == 32) {
+    if (mrb->num_writes == MAX_MERGE_REQS) {
         virtio_submit_multiwrite(req->dev->bs, mrb);
     }
 
-- 
1.7.9.5