vfs nameidata

struct nameidata {
    struct path    path;
    struct qstr    last;
    struct path    root;
    unsigned int    flags;
    int        last_type;
    unsigned    depth;
    char *saved_names[MAX_NESTED_LINKS + 1];

    /* Intent data */
    union {
        struct open_intent open;
    } intent;
};


/*
 * linux/include/linux/dcache.h
 *
 * Dirent cache data structures
 *
 * (C) Copyright 1997 Thomas Schoebel-Theuer,
 * with heavy changes by Linus Torvalds
 */

#define IS_ROOT(x) ((x) == (x)->d_parent)

/*
 * "quick string" -- eases parameter passing, but more importantly
 * saves "metadata" about the string (ie length and the hash).
 *
 * hash comes first so it snuggles against d_parent in the
 * dentry.
 */
struct qstr {
    unsigned int hash;
    unsigned int len;
    const unsigned char *name;
};

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