projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef _LINUX_NAMEI_H |
| 2 | #define _LINUX_NAMEI_H | |
| 3 | ||
| 82b0547c | 4 | #include <linux/dcache.h> |
| 1da177e4 LT |
5 | #include <linux/linkage.h> |
| 6 | ||
| 7 | struct vfsmount; | |
| 8 | ||
| 9 | struct open_intent { | |
| 10 | int flags; | |
| 11 | int create_mode; | |
| 834f2a4a | 12 | struct file *file; |
| 1da177e4 LT |
13 | }; |
| 14 | ||
| 737bebd1 | 15 | enum { MAX_NESTED_LINKS = 8 }; |
| 1da177e4 LT |
16 | |
| 17 | struct nameidata { | |
| 18 | struct dentry *dentry; | |
| 19 | struct vfsmount *mnt; | |
| 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) | |
| 650a8983 | 58 | #define LOOKUP_CHDIR (0x0800) |
| 1da177e4 LT |
59 | |
| 60 | extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *)); | |
| 5590ff0d | 61 | extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *)); |
| 1da177e4 | 62 | #define user_path_walk(name,nd) \ |
| 5590ff0d | 63 | __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd) |
| 1da177e4 | 64 | #define user_path_walk_link(name,nd) \ |
| 5590ff0d | 65 | __user_walk_fd(AT_FDCWD, name, 0, nd) |
| 1da177e4 LT |
66 | extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *)); |
| 67 | extern int FASTCALL(path_walk(const char *, struct nameidata *)); | |
| 68 | extern int FASTCALL(link_path_walk(const char *, struct nameidata *)); | |
| 69 | extern void path_release(struct nameidata *); | |
| 70 | extern void path_release_on_umount(struct nameidata *); | |
| 71 | ||
| 834f2a4a | 72 | extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags); |
| 5590ff0d | 73 | extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags); |
| 834f2a4a TM |
74 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, |
| 75 | int (*open)(struct inode *, struct file *)); | |
| 76 | extern struct file *nameidata_to_filp(struct nameidata *nd, int flags); | |
| 77 | extern void release_open_intent(struct nameidata *); | |
| 78 | ||
| 1da177e4 | 79 | extern struct dentry * lookup_one_len(const char *, struct dentry *, int); |
| 1da177e4 LT |
80 | |
| 81 | extern int follow_down(struct vfsmount **, struct dentry **); | |
| 82 | extern int follow_up(struct vfsmount **, struct dentry **); | |
| 83 | ||
| 84 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
| 85 | extern void unlock_rename(struct dentry *, struct dentry *); | |
| 86 | ||
| 87 | static inline void nd_set_link(struct nameidata *nd, char *path) | |
| 88 | { | |
| 89 | nd->saved_names[nd->depth] = path; | |
| 90 | } | |
| 91 | ||
| 92 | static inline char *nd_get_link(struct nameidata *nd) | |
| 93 | { | |
| 94 | return nd->saved_names[nd->depth]; | |
| 95 | } | |
| 96 | ||
| 97 | #endif /* _LINUX_NAMEI_H */ |