libceph: small refactor in write_partial_kvec()

Make a small change in the code that counts down kvecs consumed by
a ceph_tcp_sendmsg() call.  Same functionality, just blocked out
a little differently.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 575511a29eb7f68d7526d8d74119680caaa61751..e8f236e87f38e1023d5497d915d06fab3c038bab 100644 (file)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -747,17 +747,18 @@ static int write_partial_kvec(struct ceph_connection *con)
                con->out_kvec_bytes -= ret;
                if (con->out_kvec_bytes == 0)
                        break;            /* done */
-               while (ret > 0) {
-                       if (ret >= con->out_kvec_cur->iov_len) {
-                               ret -= con->out_kvec_cur->iov_len;
-                               con->out_kvec_cur++;
-                               con->out_kvec_left--;
-                       } else {
-                               con->out_kvec_cur->iov_len -= ret;
-                               con->out_kvec_cur->iov_base += ret;
-                               ret = 0;
-                               break;
-                       }
+
+               /* account for full iov entries consumed */
+               while (ret >= con->out_kvec_cur->iov_len) {
+                       BUG_ON(!con->out_kvec_left);
+                       ret -= con->out_kvec_cur->iov_len;
+                       con->out_kvec_cur++;
+                       con->out_kvec_left--;
+               }
+               /* and for a partially-consumed entry */
+               if (ret) {
+                       con->out_kvec_cur->iov_len -= ret;
+                       con->out_kvec_cur->iov_base += ret;
                }
        }
        con->out_kvec_left = 0;