NFSv4.1: Don't cache deviceids that have no notifications
The spec says that once all layouts that reference a given deviceid
have been returned, then we are only allowed to continue to cache
the deviceid if the metadata server supports notifications.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ba8b2b5..9ff8c63 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7962,6 +7962,8 @@
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
if (res.notification & ~args.notify_types)
dprintk("%s: unsupported notification\n", __func__);
+ if (res.notification != args.notify_types)
+ pdev->nocache = 1;
dprintk("<-- %s status=%d\n", __func__, status);