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root/include/linux/namei.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. nd_set_link
  2. nd_get_link

#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)

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 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 */

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