projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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; | |
| 834f2a4a | 11 | struct file *file; |
| 1da177e4 LT |
12 | }; |
| 13 | ||
| 14 | enum { MAX_NESTED_LINKS = 5 }; | |
| 15 | ||
| 16 | struct nameidata { | |
| 17 | struct dentry *dentry; | |
| 18 | struct vfsmount *mnt; | |
| 19 | struct qstr last; | |
| 20 | unsigned int flags; | |
| 21 | int last_type; | |
| 22 | unsigned depth; | |
| 23 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
| 24 | ||
| 25 | /* Intent data */ | |
| 26 | union { | |
| 27 | struct open_intent open; | |
| 28 | } intent; | |
| 29 | }; | |
| 30 | ||
| 31 | /* | |
| 32 | * Type of the last component on LOOKUP_PARENT | |
| 33 | */ | |
| 34 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
| 35 | ||
| 36 | /* | |
| 37 | * The bitmask for a lookup event: | |
| 38 | * - follow links at the end | |
| 39 | * - require a directory | |
| 40 | * - ending slashes ok even for nonexistent files | |
| 41 | * - internal "there are more path compnents" flag | |
| 42 | * - locked when lookup done with dcache_lock held | |
| 43 | * - dentry cache is untrusted; force a real lookup | |
| 44 | */ | |
| 45 | #define LOOKUP_FOLLOW 1 | |
| 46 | #define LOOKUP_DIRECTORY 2 | |
| 47 | #define LOOKUP_CONTINUE 4 | |
| 48 | #define LOOKUP_PARENT 16 | |
| 49 | #define LOOKUP_NOALT 32 | |
| 50 | #define LOOKUP_REVAL 64 | |
| 51 | /* | |
| 52 | * Intent data | |
| 53 | */ | |
| 54 | #define LOOKUP_OPEN (0x0100) | |
| 55 | #define LOOKUP_CREATE (0x0200) | |
| 56 | #define LOOKUP_ACCESS (0x0400) | |
| 57 | ||
| 58 | extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *)); | |
| 5590ff0d | 59 | extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *)); |
| 1da177e4 | 60 | #define user_path_walk(name,nd) \ |
| 5590ff0d | 61 | __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd) |
| 1da177e4 | 62 | #define user_path_walk_link(name,nd) \ |
| 5590ff0d | 63 | __user_walk_fd(AT_FDCWD, name, 0, nd) |
| 1da177e4 LT |
64 | extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *)); |
| 65 | extern int FASTCALL(path_walk(const char *, struct nameidata *)); | |
| 66 | extern int FASTCALL(link_path_walk(const char *, struct nameidata *)); | |
| 67 | extern void path_release(struct nameidata *); | |
| 68 | extern void path_release_on_umount(struct nameidata *); | |
| 69 | ||
| 834f2a4a | 70 | extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags); |
| 5590ff0d | 71 | extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags); |
| 834f2a4a TM |
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 | ||
| 1da177e4 | 77 | extern struct dentry * lookup_one_len(const char *, struct dentry *, int); |
| 1da177e4 LT |
78 | |
| 79 | extern int follow_down(struct vfsmount **, struct dentry **); | |
| 80 | extern int follow_up(struct vfsmount **, struct dentry **); | |
| 81 | ||
| 82 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
| 83 | extern void unlock_rename(struct dentry *, struct dentry *); | |
| 84 | ||
| 85 | static inline void nd_set_link(struct nameidata *nd, char *path) | |
| 86 | { | |
| 87 | nd->saved_names[nd->depth] = path; | |
| 88 | } | |
| 89 | ||
| 90 | static inline char *nd_get_link(struct nameidata *nd) | |
| 91 | { | |
| 92 | return nd->saved_names[nd->depth]; | |
| 93 | } | |
| 94 | ||
| 95 | #endif /* _LINUX_NAMEI_H */ |