| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_NAMEI_H |
| 2 | #define _LINUX_NAMEI_H |
| 3 | |
| 4 | #include <linux/linkage.h> |
| 5 | |
| 6 | struct vfsmount; |
| 7 | |
| 8 | struct open_intent { |
| 9 | int flags; |
| 10 | int create_mode; |
| 11 | }; |
| 12 | |
| 13 | enum { MAX_NESTED_LINKS = 5 }; |
| 14 | |
| 15 | struct nameidata { |
| 16 | struct dentry *dentry; |
| 17 | struct vfsmount *mnt; |
| 18 | struct qstr last; |
| 19 | unsigned int flags; |
| 20 | int last_type; |
| 21 | unsigned depth; |
| 22 | char *saved_names[MAX_NESTED_LINKS + 1]; |
| 23 | |
| 24 | /* Intent data */ |
| 25 | union { |
| 26 | struct open_intent open; |
| 27 | } intent; |
| 28 | }; |
| 29 | |
| 30 | /* |
| 31 | * Type of the last component on LOOKUP_PARENT |
| 32 | */ |
| 33 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; |
| 34 | |
| 35 | /* |
| 36 | * The bitmask for a lookup event: |
| 37 | * - follow links at the end |
| 38 | * - require a directory |
| 39 | * - ending slashes ok even for nonexistent files |
| 40 | * - internal "there are more path compnents" flag |
| 41 | * - locked when lookup done with dcache_lock held |
| 42 | * - dentry cache is untrusted; force a real lookup |
| 43 | */ |
| 44 | #define LOOKUP_FOLLOW 1 |
| 45 | #define LOOKUP_DIRECTORY 2 |
| 46 | #define LOOKUP_CONTINUE 4 |
| 47 | #define LOOKUP_PARENT 16 |
| 48 | #define LOOKUP_NOALT 32 |
| 49 | #define LOOKUP_REVAL 64 |
| 50 | /* |
| 51 | * Intent data |
| 52 | */ |
| 53 | #define LOOKUP_OPEN (0x0100) |
| 54 | #define LOOKUP_CREATE (0x0200) |
| 55 | #define LOOKUP_ACCESS (0x0400) |
| 56 | |
| 57 | extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *)); |
| 58 | #define user_path_walk(name,nd) \ |
| 59 | __user_walk(name, LOOKUP_FOLLOW, nd) |
| 60 | #define user_path_walk_link(name,nd) \ |
| 61 | __user_walk(name, 0, nd) |
| 62 | extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *)); |
| 63 | extern int FASTCALL(path_walk(const char *, struct nameidata *)); |
| 64 | extern int FASTCALL(link_path_walk(const char *, struct nameidata *)); |
| 65 | extern void path_release(struct nameidata *); |
| 66 | extern void path_release_on_umount(struct nameidata *); |
| 67 | |
| 68 | extern struct dentry * lookup_one_len(const char *, struct dentry *, int); |
| 69 | extern struct dentry * lookup_hash(struct qstr *, struct dentry *); |
| 70 | |
| 71 | extern int follow_down(struct vfsmount **, struct dentry **); |
| 72 | extern int follow_up(struct vfsmount **, struct dentry **); |
| 73 | |
| 74 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); |
| 75 | extern void unlock_rename(struct dentry *, struct dentry *); |
| 76 | |
| 77 | static inline void nd_set_link(struct nameidata *nd, char *path) |
| 78 | { |
| 79 | nd->saved_names[nd->depth] = path; |
| 80 | } |
| 81 | |
| 82 | static inline char *nd_get_link(struct nameidata *nd) |
| 83 | { |
| 84 | return nd->saved_names[nd->depth]; |
| 85 | } |
| 86 | |
| 87 | #endif /* _LINUX_NAMEI_H */ |