1 files changed, 64 insertions, 0 deletions
diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
new file mode 100644
index 000000000000..9805514444c9
--- /dev/null
+++ b/include/linux/fs_context.h
@@ -0,0 +1,64 @@
+/* Filesystem superblock creation and reconfiguration context.
+ *
+ * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _LINUX_FS_CONTEXT_H
+#define _LINUX_FS_CONTEXT_H
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/security.h>
+
+struct cred;
+struct dentry;
+struct file_operations;
+struct file_system_type;
+struct net;
+struct user_namespace;
+
+enum fs_context_purpose {
+	FS_CONTEXT_FOR_MOUNT,		/* New superblock for explicit mount */
+};
+
+/*
+ * Filesystem context for holding the parameters used in the creation or
+ * reconfiguration of a superblock.
+ *
+ * Superblock creation fills in ->root whereas reconfiguration begins with this
+ * already set.
+ *
+ * See Documentation/filesystems/mounting.txt
+ */
+struct fs_context {
+	struct file_system_type	*fs_type;
+	void			*fs_private;	/* The filesystem's context */
+	struct dentry		*root;		/* The root and superblock */
+	struct user_namespace	*user_ns;	/* The user namespace for this mount */
+	struct net		*net_ns;	/* The network namespace for this mount */
+	const struct cred	*cred;		/* The mounter's credentials */
+	const char		*source;	/* The source name (eg. dev path) */
+	const char		*subtype;	/* The subtype to set on the superblock */
+	void			*security;	/* Linux S&M options */
+	unsigned int		sb_flags;	/* Proposed superblock flags (SB_*) */
+	unsigned int		sb_flags_mask;	/* Superblock flags that were changed */
+	enum fs_context_purpose	purpose:8;
+	bool			need_free:1;	/* Need to call ops->free() */
+};
+
+/*
+ * fs_context manipulation functions.
+ */
+extern struct fs_context *fs_context_for_mount(struct file_system_type *fs_type,
+						unsigned int sb_flags);
+
+extern int vfs_get_tree(struct fs_context *fc);
+extern void put_fs_context(struct fs_context *fc);
+
+#endif /* _LINUX_FS_CONTEXT_H */