sunrpc: close connection when a request is irretrievably lost.

If we drop a request in the sunrpc layer, either due kmalloc failure,
or due to a cache miss when we could not queue the request for later
replay, then close the connection to encourage the client to retry sooner.

Note that if the drop happens in the NFS layer, NFSERR_JUKEBOX
(aka NFS4ERR_DELAY) is returned to guide the client concerning
replay.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index d9017d64597e..6359c42c4941 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1055,6 +1055,9 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
                 goto err_bad;
         case SVC_DENIED:
                 goto err_bad_auth;
+        case SVC_CLOSE:
+                if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
+                        svc_close_xprt(rqstp->rq_xprt);
         case SVC_DROP:
                 goto dropit;
         case SVC_COMPLETE: