#ifndef _LINUX_NAMEI_H

#define _LINUX_NAMEI_H

#include <linux/dcache.h>

#include <linux/linkage.h>

#include <linux/path.h>

struct vfsmount;

struct open_intent {

	int	flags;

	int	create_mode;

	struct file *file;

};

enum { MAX_NESTED_LINKS = 8 };

struct nameidata {

	struct path	path;

	struct qstr	last;

	unsigned int	flags;

	int		last_type;

	unsigned	depth;

	char *saved_names[MAX_NESTED_LINKS + 1];

	/* Intent data */

	union {

		struct open_intent open;

	} intent;

};

/*

 * Type of the last component on LOOKUP_PARENT

 */

enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};

/*

 * The bitmask for a lookup event:

 *  - follow links at the end

 *  - require a directory

 *  - ending slashes ok even for nonexistent files

 *  - internal "there are more path compnents" flag

 *  - locked when lookup done with dcache_lock held

 *  - dentry cache is untrusted; force a real lookup

 */

#define LOOKUP_FOLLOW		 1

#define LOOKUP_DIRECTORY	 2

#define LOOKUP_CONTINUE		 4

#define LOOKUP_PARENT		16

#define LOOKUP_REVAL		64

/*

 * Intent data

 */

#define LOOKUP_OPEN		0x0100

#define LOOKUP_CREATE		0x0200

#define LOOKUP_EXCL		0x0400

#define LOOKUP_RENAME_TARGET	0x0800

extern int user_path_at(int, const char __user *, unsigned, struct path *);

#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)

#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)

#define user_path_dir(name, path) \

	user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)

extern int kern_path(const char *, unsigned, struct path *);

extern int path_lookup(const char *, unsigned, struct nameidata *);

extern int vfs_path_lookup(struct dentry *, struct vfsmount *,

			   const char *, unsigned int, struct nameidata *);

extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);

extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,

		int (*open)(struct inode *, struct file *));

extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);

extern void release_open_intent(struct nameidata *);

extern struct dentry *lookup_one_len(const char *, struct dentry *, int);

extern struct dentry *lookup_one_noperm(const char *, struct dentry *);

extern int follow_down(struct vfsmount **, struct dentry **);

extern int follow_up(struct vfsmount **, struct dentry **);

extern struct dentry *lock_rename(struct dentry *, struct dentry *);

extern void unlock_rename(struct dentry *, struct dentry *);

static inline void nd_set_link(struct nameidata *nd, char *path)

{

	nd->saved_names[nd->depth] = path;

}

static inline char *nd_get_link(struct nameidata *nd)

{

	return nd->saved_names[nd->depth];

}

#endif /* _LINUX_NAMEI_H */