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 8 struct vfsmount; 9 10 enum { MAX_NESTED_LINKS = 8 }; 11 12 struct nameidata { 13 struct path path; 14 struct qstr last; 15 struct path root; 16 struct inode *inode; /* path.dentry.d_inode */ 17 unsigned int flags; 18 unsigned seq; 19 int last_type; 20 unsigned depth; 21 char *saved_names[MAX_NESTED_LINKS + 1]; 22 }; 23 24 /* 25 * Type of the last component on LOOKUP_PARENT 26 */ 27 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; 28 29 /* 30 * The bitmask for a lookup event: 31 * - follow links at the end 32 * - require a directory 33 * - ending slashes ok even for nonexistent files 34 * - internal "there are more path components" flag 35 * - dentry cache is untrusted; force a real lookup 36 * - suppress terminal automount 37 */ 38 #define LOOKUP_FOLLOW 0x0001 39 #define LOOKUP_DIRECTORY 0x0002 40 #define LOOKUP_AUTOMOUNT 0x0004 41 42 #define LOOKUP_PARENT 0x0010 43 #define LOOKUP_REVAL 0x0020 44 #define LOOKUP_RCU 0x0040 45 46 /* 47 * Intent data 48 */ 49 #define LOOKUP_OPEN 0x0100 50 #define LOOKUP_CREATE 0x0200 51 #define LOOKUP_EXCL 0x0400 52 #define LOOKUP_RENAME_TARGET 0x0800 53 54 #define LOOKUP_JUMPED 0x1000 55 #define LOOKUP_ROOT 0x2000 56 #define LOOKUP_EMPTY 0x4000 57 58 extern int user_path_at(int, const char __user *, unsigned, struct path *); 59 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); 60 61 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) 62 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) 63 #define user_path_dir(name, path) \ 64 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) 65 66 extern int kern_path(const char *, unsigned, struct path *); 67 68 extern struct dentry *kern_path_create(int, const char *, struct path *, int); 69 extern struct dentry *user_path_create(int, const char __user *, struct path *, int); 70 extern void done_path_create(struct path *, struct dentry *); 71 extern struct dentry *kern_path_locked(const char *, struct path *); 72 extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 73 const char *, unsigned int, struct path *); 74 75 extern struct dentry *lookup_one_len(const char *, struct dentry *, int); 76 77 extern int follow_down_one(struct path *); 78 extern int follow_down(struct path *); 79 extern int follow_up(struct path *); 80 81 extern struct dentry *lock_rename(struct dentry *, struct dentry *); 82 extern void unlock_rename(struct dentry *, struct dentry *); 83 84 extern void nd_jump_link(struct nameidata *nd, struct path *path); 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 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) 97 { 98 ((char *) name)[min(len, maxlen)] = '\0'; 99 } 100 101 #endif /* _LINUX_NAMEI_H */ 102