block/block-copy: factor out find_conflicting_inflight_req

Split find_conflicting_inflight_req to be used separately.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200311103004.7649-6-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 19 insertions, 12 deletions

diff --git a/block/block-copy.c b/block/block-copy.c
index b075dba206..251d415a2c 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -24,23 +24,30 @@
 #define BLOCK_COPY_MAX_BUFFER (1 * MiB)
 #define BLOCK_COPY_MAX_MEM (128 * MiB)
 
+static BlockCopyInFlightReq *find_conflicting_inflight_req(BlockCopyState *s,
+                                                           int64_t start,
+                                                           int64_t end)
+{
+    BlockCopyInFlightReq *req;
+
+    QLIST_FOREACH(req, &s->inflight_reqs, list) {
+        if (end > req->start_byte && start < req->end_byte) {
+            return req;
+        }
+    }
+
+    return NULL;
+}
+
 static void coroutine_fn block_copy_wait_inflight_reqs(BlockCopyState *s,
                                                        int64_t start,
                                                        int64_t end)
 {
     BlockCopyInFlightReq *req;
-    bool waited;
-
-    do {
-        waited = false;
-        QLIST_FOREACH(req, &s->inflight_reqs, list) {
-            if (end > req->start_byte && start < req->end_byte) {
-                qemu_co_queue_wait(&req->wait_queue, NULL);
-                waited = true;
-                break;
-            }
-        }
-    } while (waited);
+
+    while ((req = find_conflicting_inflight_req(s, start, end))) {
+        qemu_co_queue_wait(&req->wait_queue, NULL);
+    }
 }
 
 static void block_copy_inflight_req_begin(BlockCopyState *s,