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 unsigned int flags; 22 int last_type; 23 unsigned depth; 24 char *saved_names[MAX_NESTED_LINKS + 1]; 25 26 /* Intent data */ 27 union { 28 struct open_intent open; 29 } intent; 30 }; 31 32 /* 33 * Type of the last component on LOOKUP_PARENT 34 */ 35 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; 36 37 /* 38 * The bitmask for a lookup event: 39 * - follow links at the end 40 * - require a directory 41 * - ending slashes ok even for nonexistent files 42 * - internal "there are more path compnents" flag 43 * - locked when lookup done with dcache_lock held 44 * - dentry cache is untrusted; force a real lookup 45 */ 46 #define LOOKUP_FOLLOW 1 47 #define LOOKUP_DIRECTORY 2 48 #define LOOKUP_CONTINUE 4 49 #define LOOKUP_PARENT 16 50 #define LOOKUP_NOALT 32 51 #define LOOKUP_REVAL 64 52 /* 53 * Intent data 54 */ 55 #define LOOKUP_OPEN (0x0100) 56 #define LOOKUP_CREATE (0x0200) 57 #define LOOKUP_ACCESS (0x0400) 58 #define LOOKUP_CHDIR (0x0800) 59 60 extern int __user_walk(const char __user *, unsigned, struct nameidata *); 61 extern int __user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *); 62 #define user_path_walk(name,nd) \ 63 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd) 64 #define user_path_walk_link(name,nd) \ 65 __user_walk_fd(AT_FDCWD, name, 0, nd) 66 extern int path_lookup(const char *, unsigned, struct nameidata *); 67 extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 68 const char *, unsigned int, 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 struct dentry *lookup_one_noperm(const char *, struct dentry *); 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