xen-blkback: Use the enum req_op and blk_opf_t types

Improve static type checking by using the enum req_op type for request
operations and the new blk_opf_t type for request flags.

Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-18-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index a97f2bf..a5cf7f1 100644 (file)
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -442,7 +442,7 @@ static void free_req(struct xen_blkif_ring *ring, struct pending_req *req)
  * Routines for managing virtual block devices (vbds).
  */
 static int xen_vbd_translate(struct phys_req *req, struct xen_blkif *blkif,
-                            int operation)
+                            enum req_op operation)
 {
        struct xen_vbd *vbd = &blkif->vbd;
        int rc = -EACCES;
@@ -1193,8 +1193,8 @@ static int dispatch_rw_block_io(struct xen_blkif_ring *ring,
        struct bio *bio = NULL;
        struct bio **biolist = pending_req->biolist;
        int i, nbio = 0;
-       int operation;
-       int operation_flags = 0;
+       enum req_op operation;
+       blk_opf_t operation_flags = 0;
        struct blk_plug plug;
        bool drain = false;
        struct grant_page **pages = pending_req->segments;