Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_NAMEI_H |
| 2 | #define _LINUX_NAMEI_H |
| 3 | |
Alexey Dobriyan | 82b0547 | 2006-09-30 23:27:22 -0700 | [diff] [blame] | 4 | #include <linux/dcache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/linkage.h> |
Jan Blunck | c5e725f | 2008-02-14 19:34:31 -0800 | [diff] [blame] | 6 | #include <linux/path.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | |
| 8 | struct vfsmount; |
| 9 | |
| 10 | struct open_intent { |
| 11 | int flags; |
| 12 | int create_mode; |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 13 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | }; |
| 15 | |
Al Viro | 737bebd | 2006-07-14 00:24:29 -0700 | [diff] [blame] | 16 | enum { MAX_NESTED_LINKS = 8 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | struct nameidata { |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 19 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #define LOOKUP_REVAL 64 |
| 51 | /* |
| 52 | * Intent data |
| 53 | */ |
Al Viro | 3516586 | 2008-08-05 03:00:49 -0400 | [diff] [blame] | 54 | #define LOOKUP_OPEN 0x0100 |
| 55 | #define LOOKUP_CREATE 0x0200 |
| 56 | #define LOOKUP_EXCL 0x0400 |
OGAWA Hirofumi | 4e9ed2f | 2008-10-16 07:50:29 +0900 | [diff] [blame] | 57 | #define LOOKUP_RENAME_TARGET 0x0800 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 59 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
| 60 | |
| 61 | #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) |
| 62 | #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) |
| 63 | #define user_path_dir(name, path) \ |
| 64 | user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) |
| 65 | |
Al Viro | d181146 | 2008-08-02 00:49:18 -0400 | [diff] [blame] | 66 | extern int kern_path(const char *, unsigned, struct path *); |
| 67 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 68 | extern int path_lookup(const char *, unsigned, struct nameidata *); |
Josef 'Jeff' Sipek | 16f1820 | 2007-07-19 01:48:18 -0700 | [diff] [blame] | 69 | extern int vfs_path_lookup(struct dentry *, struct vfsmount *, |
| 70 | const char *, unsigned int, struct nameidata *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 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 | |
Christoph Hellwig | eead191 | 2007-10-16 23:25:38 -0700 | [diff] [blame] | 77 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
| 78 | extern struct dentry *lookup_one_noperm(const char *, struct dentry *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Duane Griffin | 0351468 | 2008-12-19 20:47:11 +0000 | [diff] [blame] | 96 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
| 97 | { |
| 98 | ((char *) name)[min(len, maxlen)] = '\0'; |
| 99 | } |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #endif /* _LINUX_NAMEI_H */ |