NFS: when we mount with the "nolock" flag we need to use local locking.

Signed-off-by: Trond Myklebust <trond.myklebust@fys.uio.no>

fs/nfs/file.c

@@ -295,10 +295,19 @@ nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t
 static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
 {
 	struct inode *inode = filp->f_mapping->host;
-	int status;
+	int status = 0;
 
 	lock_kernel();
-	status = NFS_PROTO(inode)->lock(filp, cmd, fl);
+	/* Use local locking if mounted with "-onolock" */
+	if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
+		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
+	else {
+		struct file_lock *cfl = posix_test_lock(filp, fl);
+		if (cfl != NULL) {
+			memcpy(fl, cfl, sizeof(*fl));
+			fl->fl_type = F_UNLCK;
+		}
+	}
 	unlock_kernel();
 	return status;
 }
@@ -325,7 +334,11 @@ static int do_unlk(struct file *filp, int cmd, struct file_lock *fl)
 	 * 	still need to complete the unlock.
 	 */
 	lock_kernel();
-	status = NFS_PROTO(inode)->lock(filp, cmd, fl);
+	/* Use local locking if mounted with "-onolock" */
+	if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
+		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
+	else
+		status = posix_lock_file_wait(filp, fl);
 	rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
 	return status;
 }
@@ -351,15 +364,19 @@ static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
 		return status;
 
 	lock_kernel();
-	status = NFS_PROTO(inode)->lock(filp, cmd, fl);
-	/* If we were signalled we still need to ensure that
-	 * we clean up any state on the server. We therefore
-	 * record the lock call as having succeeded in order to
-	 * ensure that locks_remove_posix() cleans it out when
-	 * the process exits.
-	 */
-	if (status == -EINTR || status == -ERESTARTSYS)
-		posix_lock_file(filp, fl);
+	/* Use local locking if mounted with "-onolock" */
+	if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
+		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
+		/* If we were signalled we still need to ensure that
+		 * we clean up any state on the server. We therefore
+		 * record the lock call as having succeeded in order to
+		 * ensure that locks_remove_posix() cleans it out when
+		 * the process exits.
+		 */
+		if (status == -EINTR || status == -ERESTARTSYS)
+			posix_lock_file(filp, fl);
+	} else
+		status = posix_lock_file_wait(filp, fl);
 	unlock_kernel();
 	if (status < 0)
 		return status;
@@ -396,15 +413,6 @@ nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
 	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 		return -ENOLCK;
 
-	if (NFS_PROTO(inode)->version != 4) {
-		/* Fake OK code if mounted without NLM support */
-		if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) {
-			if (IS_GETLK(cmd))
-				return LOCK_USE_CLNT;
-			return 0;
-		}
-	}
-
 	/*
 	 * No BSD flocks over NFS allowed.
 	 * Note: we could try to fake a POSIX lock request here by

fs/nfs/inode.c

@@ -1449,8 +1449,6 @@ static void nfs_kill_super(struct super_block *s)
 
 	kill_anon_super(s);
 
-	nfs4_renewd_prepare_shutdown(server);
-
 	if (server->client != NULL && !IS_ERR(server->client))
 		rpc_shutdown_client(server->client);
 	if (server->client_sys != NULL && !IS_ERR(server->client_sys))
@@ -1461,8 +1459,6 @@ static void nfs_kill_super(struct super_block *s)
 
 	rpciod_down();		/* release rpciod */
 
-	destroy_nfsv4_state(server);
-
 	if (server->hostname != NULL)
 		kfree(server->hostname);
 	kfree(server);
@@ -1543,9 +1539,6 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 		server->wsize = nfs_block_size(data->wsize, NULL);
 	server->flags = data->flags & NFS_MOUNT_FLAGMASK;
 
-	/* NFSv4 doesn't use NLM locking */
-	server->flags |= NFS_MOUNT_NONLM;
-
 	server->acregmin = data->acregmin*HZ;
 	server->acregmax = data->acregmax*HZ;
 	server->acdirmin = data->acdirmin*HZ;
@@ -1790,8 +1783,22 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
 
 static void nfs4_kill_super(struct super_block *sb)
 {
+	struct nfs_server *server = NFS_SB(sb);
+
 	nfs_return_all_delegations(sb);
-	nfs_kill_super(sb);
+	kill_anon_super(sb);
+
+	nfs4_renewd_prepare_shutdown(server);
+
+	if (server->client != NULL && !IS_ERR(server->client))
+		rpc_shutdown_client(server->client);
+	rpciod_down();		/* release rpciod */
+
+	destroy_nfsv4_state(server);
+
+	if (server->hostname != NULL)
+		kfree(server->hostname);
+	kfree(server);
 }
 
 static struct file_system_type nfs4_fs_type = {