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