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