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