NFSv4.1: Allow getdeviceinfo to return notification info back to caller

We are only allowed to cache deviceinfo if the server supports notifications
and actually promises to call us back when changes occur. Right now, we
request those notifications, but then we don't check the server's reply.

Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/nfs4proc.c

···
 {
 	struct nfs4_getdeviceinfo_args args = {
 		.pdev = pdev,
+		.notify_types = NOTIFY_DEVICEID4_CHANGE |
+			NOTIFY_DEVICEID4_DELETE,
 	};
 	struct nfs4_getdeviceinfo_res res = {
 		.pdev = pdev,
···
 
 	dprintk("--> %s\n", __func__);
 	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__);
+
 	dprintk("<-- %s status=%d\n", __func__, status);
 
 	return status;

fs/nfs/nfs4xdr.c

···
 
 	p = reserve_space(xdr, 4 + 4);
 	*p++ = cpu_to_be32(1);			/* bitmap length */
-	*p++ = cpu_to_be32(NOTIFY_DEVICEID4_CHANGE | NOTIFY_DEVICEID4_DELETE);
+	*p++ = cpu_to_be32(args->notify_types);
 }
 
 static void
···
 
 #if defined(CONFIG_NFS_V4_1)
 static int decode_getdeviceinfo(struct xdr_stream *xdr,
-				struct pnfs_device *pdev)
+				struct nfs4_getdeviceinfo_res *res)
 {
+	struct pnfs_device *pdev = res->pdev;
 	__be32 *p;
 	uint32_t len, type;
 	int status;
···
 		if (unlikely(!p))
 			goto out_overflow;
 
-		if (be32_to_cpup(p++) &
-		    ~(NOTIFY_DEVICEID4_CHANGE | NOTIFY_DEVICEID4_DELETE)) {
-			dprintk("%s: unsupported notification\n",
-				__func__);
-		}
-
+		res->notification = be32_to_cpup(p++);
 		for (i = 1; i < len; i++) {
 			if (be32_to_cpup(p++)) {
 				dprintk("%s: unsupported notification\n",
···
 	status = decode_sequence(xdr, &res->seq_res, rqstp);
 	if (status != 0)
 		goto out;
-	status = decode_getdeviceinfo(xdr, res->pdev);
+	status = decode_getdeviceinfo(xdr, res);
 out:
 	return status;
 }

include/linux/nfs_xdr.h

···
 struct nfs4_getdeviceinfo_args {
 	struct nfs4_sequence_args seq_args;
 	struct pnfs_device *pdev;
+	__u32 notify_types;
 };
 
 struct nfs4_getdeviceinfo_res {
 	struct nfs4_sequence_res seq_res;
 	struct pnfs_device *pdev;
+	__u32 notification;
 };
 
 struct nfs4_layoutcommit_args {