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 inode *inode; /* path.dentry.d_inode */ 23 unsigned int flags; 24 unsigned seq; 25 int last_type; 26 unsigned depth; 27 char *saved_names[MAX_NESTED_LINKS + 1]; 28 29 /* Intent data */ 30 union { 31 struct open_intent open; 32 } intent; 33 }; 34 35 /* 36 * Type of the last component on LOOKUP_PARENT 37 */ 38 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; 39 40 /* 41 * The bitmask for a lookup event: 42 * - follow links at the end 43 * - require a directory 44 * - ending slashes ok even for nonexistent files 45 * - internal "there are more path components" flag 46 * - dentry cache is untrusted; force a real lookup 47 * - suppress terminal automount 48 */ 49 #define LOOKUP_FOLLOW 0x0001 50 #define LOOKUP_DIRECTORY 0x0002 51 52 #define LOOKUP_PARENT 0x0010 53 #define LOOKUP_REVAL 0x0020 54 #define LOOKUP_RCU 0x0040 55 #define LOOKUP_NO_AUTOMOUNT 0x0080 56 /* 57 * Intent data 58 */ 59 #define LOOKUP_OPEN 0x0100 60 #define LOOKUP_CREATE 0x0200 61 #define LOOKUP_EXCL 0x0400 62 #define LOOKUP_RENAME_TARGET 0x0800 63 64 #define LOOKUP_JUMPED 0x1000 65 #define LOOKUP_ROOT 0x2000 66 #define LOOKUP_EMPTY 0x4000 67 68 extern int user_path_at(int, const char __user *, unsigned, struct path *); 69 70 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) 71 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) 72 #define user_path_dir(name, path) \ 73 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) 74 75 extern int kern_path(const char *, unsigned, struct path *); 76 77 extern struct dentry *kern_path_create(int, const char *, struct path *, int); 78 extern struct dentry *user_path_create(int, const char __user *, struct path *, int); 79 extern int kern_path_parent(const char *, struct nameidata *); 80 extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 81 const char *, unsigned int, struct path *); 82 83 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, 84 int (*open)(struct inode *, struct file *)); 85 86 extern struct dentry *lookup_one_len(const char *, struct dentry *, int); 87 88 extern int follow_down_one(struct path *); 89 extern int follow_down(struct path *); 90 extern int follow_up(struct path *); 91 92 extern struct dentry *lock_rename(struct dentry *, struct dentry *); 93 extern void unlock_rename(struct dentry *, struct dentry *); 94 95 static inline void nd_set_link(struct nameidata *nd, char *path) 96 { 97 nd->saved_names[nd->depth] = path; 98 } 99 100 static inline char *nd_get_link(struct nameidata *nd) 101 { 102 return nd->saved_names[nd->depth]; 103 } 104 105 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) 106 { 107 ((char *) name)[min(len, maxlen)] = '\0'; 108 } 109 110 #endif /* _LINUX_NAMEI_H */ 111