libceph: fix safe completion

handle_reply() calls complete_request() only if the first OSD reply
has ONDISK flag.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 61147fe70181..3480b058794b 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1522,6 +1522,8 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
         for (i = 0; i < numops; i++)
                 req->r_reply_op_result[i] = ceph_decode_32(&p);
 
+        already_completed = req->r_got_reply;
+
         if (!req->r_got_reply) {
 
                 req->r_result = result;
@@ -1552,16 +1554,14 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
                 __unregister_request(osdc, req);
 
-        already_completed = req->r_completed;
-        req->r_completed = 1;
         mutex_unlock(&osdc->request_mutex);
-        if (already_completed)
-                goto done;
 
-        if (req->r_callback)
-                req->r_callback(req, msg);
-        else
-                complete_all(&req->r_completion);
+        if (!already_completed) {
+                if (req->r_callback)
+                        req->r_callback(req, msg);
+                else
+                        complete_all(&req->r_completion);
+        }
 
         if (flags & CEPH_OSD_FLAG_ONDISK)
                 complete_request(req);
@@ -2121,7 +2121,6 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
         __register_request(osdc, req);
         req->r_sent = 0;
         req->r_got_reply = 0;
-        req->r_completed = 0;
         rc = __map_request(osdc, req, 0);
         if (rc < 0) {
                 if (nofail) {