[mirror_ubuntu-artful-kernel.git] / include / linux / namei.h

#ifndef _LINUX_NAMEI_H
#define _LINUX_NAMEI_H

#include <linux/dcache.h>
#include <linux/linkage.h>

struct vfsmount;

struct open_intent {
	int	flags;
	int	create_mode;
	struct file *file;
};

enum { MAX_NESTED_LINKS = 8 };

struct nameidata {
	struct dentry	*dentry;
	struct vfsmount *mnt;
	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;
};

struct path {
	struct vfsmount *mnt;
	struct dentry *dentry;
};

/*
 * 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_NOALT		32
#define LOOKUP_REVAL		64
/*
 * Intent data
 */
#define LOOKUP_OPEN		(0x0100)
#define LOOKUP_CREATE		(0x0200)
#define LOOKUP_ACCESS		(0x0400)
#define LOOKUP_CHDIR		(0x0800)

extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));
#define user_path_walk(name,nd) \
	__user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
#define user_path_walk_link(name,nd) \
	__user_walk_fd(AT_FDCWD, name, 0, nd)
extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
extern int FASTCALL(path_walk(const char *, struct nameidata *));
extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
extern void path_release(struct nameidata *);
extern void path_release_on_umount(struct nameidata *);

extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
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_len_kern(const char *, struct dentry *, int);

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 */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_NAMEI_H
	2	#define _LINUX_NAMEI_H
	3
82b0547c	4	#include <linux/dcache.h>
1da177e4 LT	5	#include <linux/linkage.h>
	6
	7	struct vfsmount;
	8
	9	struct open_intent {
	10	int flags;
	11	int create_mode;
834f2a4a	12	struct file *file;
1da177e4 LT	13	};
1da177e4 LT	14
737bebd1	15	enum { MAX_NESTED_LINKS = 8 };
1da177e4 LT	16
	17	struct nameidata {
	18	struct dentry *dentry;
	19	struct vfsmount *mnt;
	20	struct qstr last;
	21	unsigned int flags;
	22	int last_type;
	23	unsigned depth;
	24	char *saved_names[MAX_NESTED_LINKS + 1];
	25
	26	/* Intent data */
	27	union {
	28	struct open_intent open;
	29	} intent;
	30	};
	31
346f20ff JJS	32	struct path {
	33	struct vfsmount *mnt;
	34	struct dentry *dentry;
	35	};
	36
1da177e4 LT	37	/*
	38	* Type of the last component on LOOKUP_PARENT
	39	*/
	40	enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
	41
	42	/*
	43	* The bitmask for a lookup event:
	44	* - follow links at the end
	45	* - require a directory
	46	* - ending slashes ok even for nonexistent files
	47	* - internal "there are more path compnents" flag
	48	* - locked when lookup done with dcache_lock held
	49	* - dentry cache is untrusted; force a real lookup
	50	*/
	51	#define LOOKUP_FOLLOW 1
	52	#define LOOKUP_DIRECTORY 2
	53	#define LOOKUP_CONTINUE 4
	54	#define LOOKUP_PARENT 16
	55	#define LOOKUP_NOALT 32
	56	#define LOOKUP_REVAL 64
	57	/*
	58	* Intent data
	59	*/
	60	#define LOOKUP_OPEN (0x0100)
	61	#define LOOKUP_CREATE (0x0200)
	62	#define LOOKUP_ACCESS (0x0400)
650a8983	63	#define LOOKUP_CHDIR (0x0800)
1da177e4 LT	64
1da177e4 LT	65	extern int FASTCALL(__user_walk(const char __user , unsigned, struct nameidata ));
5590ff0d	66	extern int FASTCALL(__user_walk_fd(int dfd, const char __user , unsigned, struct nameidata ));
1da177e4	67	#define user_path_walk(name,nd) \
5590ff0d	68	__user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
1da177e4	69	#define user_path_walk_link(name,nd) \
5590ff0d	70	__user_walk_fd(AT_FDCWD, name, 0, nd)
1da177e4 LT	71	extern int FASTCALL(path_lookup(const char , unsigned, struct nameidata ));
	72	extern int FASTCALL(path_walk(const char , struct nameidata ));
	73	extern int FASTCALL(link_path_walk(const char , struct nameidata ));
	74	extern void path_release(struct nameidata *);
	75	extern void path_release_on_umount(struct nameidata *);
	76
834f2a4a	77	extern int __user_path_lookup_open(const char __user , unsigned lookup_flags, struct nameidata nd, int open_flags);
5590ff0d	78	extern int path_lookup_open(int dfd, const char name, unsigned lookup_flags, struct nameidata , int open_flags);
834f2a4a TM	79	extern struct file lookup_instantiate_filp(struct nameidata nd, struct dentry *dentry,
	80	int (open)(struct inode , struct file *));
	81	extern struct file nameidata_to_filp(struct nameidata nd, int flags);
	82	extern void release_open_intent(struct nameidata *);
	83
1da177e4	84	extern struct dentry * lookup_one_len(const char , struct dentry , int);
057f6c01	85	extern struct dentry lookup_one_len_kern(const char , struct dentry *, int);
1da177e4 LT	86
	87	extern int follow_down(struct vfsmount , struct dentry );
	88	extern int follow_up(struct vfsmount , struct dentry );
	89
	90	extern struct dentry lock_rename(struct dentry , struct dentry *);
	91	extern void unlock_rename(struct dentry , struct dentry );
	92
	93	static inline void nd_set_link(struct nameidata nd, char path)
	94	{
	95	nd->saved_names[nd->depth] = path;
	96	}
	97
	98	static inline char nd_get_link(struct nameidata nd)
	99	{
	100	return nd->saved_names[nd->depth];
	101	}
	102
	103	#endif /* _LINUX_NAMEI_H */