NLM: have server-side RPC clients default to soft RPC tasks

Now that it no longer does an RPC ping, lockd always ends up queueing
an RPC task for the GRANT_MSG callback. But, it also requeues the block
for later attempts. Since these are hard RPC tasks, if the client we're
calling back goes unresponsive the GRANT_MSG callbacks can stack up in
the RPC queue.

Fix this by making server-side RPC clients default to soft RPC tasks.
lockd requeues the block anyway, so this should be OK.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 00063ee..f1ef49f 100644 (file)
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -243,11 +243,18 @@ nlm_bind_host(struct nlm_host *host)
                        .program        = &nlm_program,
                        .version        = host->h_version,
                        .authflavor     = RPC_AUTH_UNIX,
-                       .flags          = (RPC_CLNT_CREATE_HARDRTRY |
-                                          RPC_CLNT_CREATE_NOPING |
+                       .flags          = (RPC_CLNT_CREATE_NOPING |
                                           RPC_CLNT_CREATE_AUTOBIND),
                };
 
+               /*
+                * lockd retries server side blocks automatically so we want
+                * those to be soft RPC calls. Client side calls need to be
+                * hard RPC tasks.
+                */
+               if (!host->h_server)
+                       args.flags |= RPC_CLNT_CREATE_HARDRTRY;
+
                clnt = rpc_create(&args);
                if (!IS_ERR(clnt))
                        host->h_rpcclnt = clnt;