ceph: messenger: change read_partial() to take "end" arg

Make the second argument to read_partial() be the ending input byte
position rather than the beginning offset it now represents.  This
amounts to moving the addition "to + size" into the caller.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 38 insertions, 22 deletions

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 37fd2aece232..a659b4de64aa 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -992,10 +992,8 @@ static int prepare_read_message(struct ceph_connection *con)
 
 
 static int read_partial(struct ceph_connection *con,
-                        int to, int size, void *object)
+                        int end, int size, void *object)
 {
-        int end = to + size;
-
         while (con->in_base_pos < end) {
                 int left = end - con->in_base_pos;
                 int have = size - left;
@@ -1013,40 +1011,52 @@ static int read_partial(struct ceph_connection *con,
  */
 static int read_partial_banner(struct ceph_connection *con)
 {
-        int ret, to = 0;
+        int size;
+        int end;
+        int ret;
 
         dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
 
         /* peer's banner */
-        ret = read_partial(con, to, strlen(CEPH_BANNER), con->in_banner);
+        size = strlen(CEPH_BANNER);
+        end = size;
+        ret = read_partial(con, end, size, con->in_banner);
         if (ret <= 0)
                 goto out;
-        to += strlen(CEPH_BANNER);
-        ret = read_partial(con, to, sizeof(con->actual_peer_addr),
-                           &con->actual_peer_addr);
+
+        size = sizeof (con->actual_peer_addr);
+        end += size;
+        ret = read_partial(con, end, size, &con->actual_peer_addr);
         if (ret <= 0)
                 goto out;
-        to += sizeof(con->actual_peer_addr);
-        ret = read_partial(con, to, sizeof(con->peer_addr_for_me),
-                           &con->peer_addr_for_me);
+
+        size = sizeof (con->peer_addr_for_me);
+        end += size;
+        ret = read_partial(con, end, size, &con->peer_addr_for_me);
         if (ret <= 0)
                 goto out;
+
 out:
         return ret;
 }
 
 static int read_partial_connect(struct ceph_connection *con)
 {
-        int ret, to = 0;
+        int size;
+        int end;
+        int ret;
 
         dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
 
-        ret = read_partial(con, to, sizeof(con->in_reply), &con->in_reply);
+        size = sizeof (con->in_reply);
+        end = size;
+        ret = read_partial(con, end, size, &con->in_reply);
         if (ret <= 0)
                 goto out;
-        to += sizeof(con->in_reply);
-        ret = read_partial(con, to, le32_to_cpu(con->in_reply.authorizer_len),
-                           con->auth_reply_buf);
+
+        size = le32_to_cpu(con->in_reply.authorizer_len);
+        end += size;
+        ret = read_partial(con, end, size, con->auth_reply_buf);
         if (ret <= 0)
                 goto out;
 
@@ -1495,8 +1505,10 @@ static int process_connect(struct ceph_connection *con)
  */
 static int read_partial_ack(struct ceph_connection *con)
 {
-        return read_partial(con, 0, sizeof(con->in_temp_ack),
-                            &con->in_temp_ack);
+        int size = sizeof (con->in_temp_ack);
+        int end = size;
+
+        return read_partial(con, end, size, &con->in_temp_ack);
 }
 
 
@@ -1629,8 +1641,9 @@ static int read_partial_message_bio(struct ceph_connection *con,
 static int read_partial_message(struct ceph_connection *con)
 {
         struct ceph_msg *m = con->in_msg;
+        int size;
+        int end;
         int ret;
-        int to;
         unsigned front_len, middle_len, data_len;
         bool do_datacrc = !con->msgr->nocrc;
         int skip;
@@ -1640,7 +1653,9 @@ static int read_partial_message(struct ceph_connection *con)
         dout("read_partial_message con %p msg %p\n", con, m);
 
         /* header */
-        ret = read_partial(con, 0, sizeof (con->in_hdr), &con->in_hdr);
+        size = sizeof (con->in_hdr);
+        end = size;
+        ret = read_partial(con, end, size, &con->in_hdr);
         if (ret <= 0)
                 return ret;
 
@@ -1755,8 +1770,9 @@ static int read_partial_message(struct ceph_connection *con)
         }
 
         /* footer */
-        to = sizeof (m->hdr);
-        ret = read_partial(con, to, sizeof (m->footer), &m->footer);
+        size = sizeof (m->footer);
+        end += size;
+        ret = read_partial(con, end, size, &m->footer);
         if (ret <= 0)
                 return ret;