1#ifndef _LINUX_NAMEI_H 2#define _LINUX_NAMEI_H 3 4#include <linux/dcache.h> 5#include <linux/linkage.h> 6#include <linux/path.h> 7 8struct vfsmount; 9 10struct open_intent { 11 int flags; 12 int create_mode; 13 struct file *file; 14}; 15 16enum { MAX_NESTED_LINKS = 8 }; 17 18struct nameidata { 19 struct path path; 20 struct qstr last; 21 struct path root; 22 unsigned int flags; 23 int last_type; 24 unsigned depth; 25 char *saved_names[MAX_NESTED_LINKS + 1]; 26 27 /* Intent data */ 28 union { 29 struct open_intent open; 30 } intent; 31}; 32 33/* 34 * Type of the last component on LOOKUP_PARENT 35 */ 36enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; 37 38/* 39 * The bitmask for a lookup event: 40 * - follow links at the end 41 * - require a directory 42 * - ending slashes ok even for nonexistent files 43 * - internal "there are more path components" flag 44 * - locked when lookup done with dcache_lock held 45 * - dentry cache is untrusted; force a real lookup 46 */ 47#define LOOKUP_FOLLOW 1 48#define LOOKUP_DIRECTORY 2 49#define LOOKUP_CONTINUE 4 50#define LOOKUP_PARENT 16 51#define LOOKUP_REVAL 64 52/* 53 * Intent data 54 */ 55#define LOOKUP_OPEN 0x0100 56#define LOOKUP_CREATE 0x0200 57#define LOOKUP_EXCL 0x0400 58#define LOOKUP_RENAME_TARGET 0x0800 59 60extern int user_path_at(int, const char __user *, unsigned, struct path *); 61 62#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) 63#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) 64#define user_path_dir(name, path) \ 65 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) 66 67extern int kern_path(const char *, unsigned, struct path *); 68 69extern int path_lookup(const char *, unsigned, struct nameidata *); 70extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 71 const char *, unsigned int, struct nameidata *); 72 73extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, 74 int (*open)(struct inode *, struct file *)); 75 76extern struct dentry *lookup_one_len(const char *, struct dentry *, int); 77 78extern int follow_down(struct path *); 79extern int follow_up(struct path *); 80 81extern struct dentry *lock_rename(struct dentry *, struct dentry *); 82extern void unlock_rename(struct dentry *, struct dentry *); 83 84static inline void nd_set_link(struct nameidata *nd, char *path) 85{ 86 nd->saved_names[nd->depth] = path; 87} 88 89static inline char *nd_get_link(struct nameidata *nd) 90{ 91 return nd->saved_names[nd->depth]; 92} 93 94static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) 95{ 96 ((char *) name)[min(len, maxlen)] = '\0'; 97} 98 99#endif /* _LINUX_NAMEI_H */ 100