mds: fix O_TRUNC locking

When truncating a file, we should xlock the corresponding filelock.
(revoke any Fw caps from clients).

[note from sw: setattr on size also takes the filelock xlock.]

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

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 627ecd0cdb7389fb0a7809bb3c518778fcf0be4f..38dad1948a457e4c226a455792e2269f1c2f29ee 100644 (file)
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -2437,7 +2437,7 @@ void Server::handle_client_open(MDRequest *mdr)
        mdr->session->have_completed_request(req->get_reqid().tid, NULL))) {
     assert(cur->is_auth());
 
-    wrlocks.insert(&cur->filelock);
+    xlocks.insert(&cur->filelock);
     if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks))
       return;