| #ifndef _LINUX_NAMEI_H |
| #define _LINUX_NAMEI_H |
| |
| #include <linux/dcache.h> |
| #include <linux/linkage.h> |
| #include <linux/path.h> |
| |
| struct vfsmount; |
| |
| enum { MAX_NESTED_LINKS = 8 }; |
| |
| struct nameidata { |
| struct path path; |
| struct qstr last; |
| struct path root; |
| struct inode *inode; /* path.dentry.d_inode */ |
| unsigned int flags; |
| unsigned seq; |
| int last_type; |
| unsigned depth; |
| char *saved_names[MAX_NESTED_LINKS + 1]; |
| }; |
| |
| /* |
| * Type of the last component on LOOKUP_PARENT |
| */ |
| enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; |
| |
| /* |
| * The bitmask for a lookup event: |
| * - follow links at the end |
| * - require a directory |
| * - ending slashes ok even for nonexistent files |
| * - internal "there are more path components" flag |
| * - dentry cache is untrusted; force a real lookup |
| * - suppress terminal automount |
| */ |
| #define LOOKUP_FOLLOW 0x0001 |
| #define LOOKUP_DIRECTORY 0x0002 |
| #define LOOKUP_AUTOMOUNT 0x0004 |
| |
| #define LOOKUP_PARENT 0x0010 |
| #define LOOKUP_REVAL 0x0020 |
| #define LOOKUP_RCU 0x0040 |
| |
| /* |
| * Intent data |
| */ |
| #define LOOKUP_OPEN 0x0100 |
| #define LOOKUP_CREATE 0x0200 |
| #define LOOKUP_EXCL 0x0400 |
| #define LOOKUP_RENAME_TARGET 0x0800 |
| |
| #define LOOKUP_JUMPED 0x1000 |
| #define LOOKUP_ROOT 0x2000 |
| #define LOOKUP_EMPTY 0x4000 |
| |
| extern int user_path_at(int, const char __user *, unsigned, struct path *); |
| extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
| |
| #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) |
| #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) |
| #define user_path_dir(name, path) \ |
| user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) |
| |
| extern int kern_path(const char *, unsigned, struct path *); |
| |
| extern struct dentry *kern_path_create(int, const char *, struct path *, int); |
| extern struct dentry *user_path_create(int, const char __user *, struct path *, int); |
| extern struct dentry *kern_path_locked(const char *, struct path *); |
| extern int vfs_path_lookup(struct dentry *, struct vfsmount *, |
| const char *, unsigned int, struct path *); |
| |
| extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
| |
| extern int follow_down_one(struct path *); |
| extern int follow_down(struct path *); |
| extern int follow_up(struct path *); |
| |
| extern struct dentry *lock_rename(struct dentry *, struct dentry *); |
| extern void unlock_rename(struct dentry *, struct dentry *); |
| |
| static inline void nd_set_link(struct nameidata *nd, char *path) |
| { |
| nd->saved_names[nd->depth] = path; |
| } |
| |
| static inline char *nd_get_link(struct nameidata *nd) |
| { |
| return nd->saved_names[nd->depth]; |
| } |
| |
| static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
| { |
| ((char *) name)[min(len, maxlen)] = '\0'; |
| } |
| |
| #endif /* _LINUX_NAMEI_H */ |