Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/fs/smb/client/export.c b/fs/smb/client/export.c
new file mode 100644
index 0000000000..37c28415df
--- /dev/null
+++ b/fs/smb/client/export.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ *   Copyright (C) International Business Machines  Corp., 2007
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ *   Common Internet FileSystem (CIFS) client
+ *
+ *   Operations related to support for exporting files via NFSD
+ *
+ */
+
+ /*
+  * See Documentation/filesystems/nfs/exporting.rst
+  * and examples in fs/exportfs
+  *
+  * Since cifs is a network file system, an "fsid" must be included for
+  * any nfs exports file entries which refer to cifs paths.  In addition
+  * the cifs mount must be mounted with the "serverino" option (ie use stable
+  * server inode numbers instead of locally generated temporary ones).
+  * Although cifs inodes do not use generation numbers (have generation number
+  * of zero) - the inode number alone should be good enough for simple cases
+  * in which users want to export cifs shares with NFS. The decode and encode
+  * could be improved by using a new routine which expects 64 bit inode numbers
+  * instead of the default 32 bit routines in fs/exportfs
+  *
+  */
+
+#include <linux/fs.h>
+#include <linux/exportfs.h>
+#include "cifsglob.h"
+#include "cifs_debug.h"
+#include "cifsfs.h"
+
+#ifdef CONFIG_CIFS_NFSD_EXPORT
+static struct dentry *cifs_get_parent(struct dentry *dentry)
+{
+	/* BB need to add code here eventually to enable export via NFSD */
+	cifs_dbg(FYI, "get parent for %p\n", dentry);
+	return ERR_PTR(-EACCES);
+}
+
+const struct export_operations cifs_export_ops = {
+	.get_parent = cifs_get_parent,
+/*	Following five export operations are unneeded so far and can default:
+	.get_dentry =
+	.get_name =
+	.find_exported_dentry =
+	.decode_fh =
+	.encode_fs =  */
+};
+
+#endif /* CONFIG_CIFS_NFSD_EXPORT */
+