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 struct open_intent { 11 int flags; 12 int create_mode; 13 struct file *file; 14 }; 15 16 enum { MAX_NESTED_LINKS = 8 }; 17 18 struct nameidata { 19 struct path path; 20 struct qstr last; 21 struct path root; 22 struct file *file; 23 struct inode *inode; /* path.dentry.d_inode */ 24 unsigned int flags; 25 unsigned seq; 26 int last_type; 27 unsigned depth; 28 char *saved_names[MAX_NESTED_LINKS + 1]; 29 30 /* Intent data */ 31 union { 32 struct open_intent open; 33 } intent; 34 }; 35 36 /* 37 * Type of the last component on LOOKUP_PARENT 38 */ 39 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; 40 41 /* 42 * The bitmask for a lookup event: 43 * - follow links at the end 44 * - require a directory 45 * - ending slashes ok even for nonexistent files 46 * - internal "there are more path components" flag 47 * - dentry cache is untrusted; force a real lookup 48 * - suppress terminal automount 49 */ 50 #define LOOKUP_FOLLOW 0x0001 51 #define LOOKUP_DIRECTORY 0x0002 52 #define LOOKUP_CONTINUE 0x0004 53 54 #define LOOKUP_PARENT 0x0010 55 #define LOOKUP_REVAL 0x0020 56 #define LOOKUP_RCU 0x0040 57 #define LOOKUP_NO_AUTOMOUNT 0x0080 58 /* 59 * Intent data 60 */ 61 #define LOOKUP_OPEN 0x0100 62 #define LOOKUP_CREATE 0x0200 63 #define LOOKUP_EXCL 0x0400 64 #define LOOKUP_RENAME_TARGET 0x0800 65 66 extern int user_path_at(int, const char __user *, unsigned, struct path *); 67 68 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) 69 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) 70 #define user_path_dir(name, path) \ 71 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) 72 73 extern int kern_path(const char *, unsigned, struct path *); 74 75 extern int path_lookup(const char *, unsigned, struct nameidata *); 76 extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 77 const char *, unsigned int, struct nameidata *); 78 79 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, 80 int (*open)(struct inode *, struct file *)); 81 82 extern struct dentry *lookup_one_len(const char *, struct dentry *, int); 83 84 extern int follow_down_one(struct path *); 85 extern int follow_down(struct path *, bool); 86 extern int follow_up(struct path *); 87 88 extern struct dentry *lock_rename(struct dentry *, struct dentry *); 89 extern void unlock_rename(struct dentry *, struct dentry *); 90 91 static inline void nd_set_link(struct nameidata *nd, char *path) 92 { 93 nd->saved_names[nd->depth] = path; 94 } 95 96 static inline char *nd_get_link(struct nameidata *nd) 97 { 98 return nd->saved_names[nd->depth]; 99 } 100 101 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) 102 { 103 ((char *) name)[min(len, maxlen)] = '\0'; 104 } 105 106 #endif /* _LINUX_NAMEI_H */ 107