1 files changed, 87 insertions, 0 deletions

diff --git a/include/linux/namei.h b/include/linux/namei.h
new file mode 100644
index 000000000000..7db67b008cac
--- /dev/null
+++ b/include/linux/namei.h
@@ -0,0 +1,87 @@
+#ifndef _LINUX_NAMEI_H
+#define _LINUX_NAMEI_H
+
+#include <linux/linkage.h>
+
+struct vfsmount;
+
+struct open_intent {
+        int     flags;
+        int     create_mode;
+};
+
+enum { MAX_NESTED_LINKS = 5 };
+
+struct nameidata {
+        struct dentry   *dentry;
+        struct vfsmount *mnt;
+        struct qstr     last;
+        unsigned int    flags;
+        int             last_type;
+        unsigned        depth;
+        char *saved_names[MAX_NESTED_LINKS + 1];
+
+        /* Intent data */
+        union {
+                struct open_intent open;
+        } intent;
+};
+
+/*
+ * Type of the last component on LOOKUP_PARENT
+ */
+enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
+
+/*
+ * The bitmask for a lookup event:
+ *  - follow links at the end
+ *  - require a directory
+ *  - ending slashes ok even for nonexistent files
+ *  - internal "there are more path compnents" flag
+ *  - locked when lookup done with dcache_lock held
+ *  - dentry cache is untrusted; force a real lookup
+ */
+#define LOOKUP_FOLLOW            1
+#define LOOKUP_DIRECTORY         2
+#define LOOKUP_CONTINUE          4
+#define LOOKUP_PARENT           16
+#define LOOKUP_NOALT            32
+#define LOOKUP_REVAL            64
+/*
+ * Intent data
+ */
+#define LOOKUP_OPEN             (0x0100)
+#define LOOKUP_CREATE           (0x0200)
+#define LOOKUP_ACCESS           (0x0400)
+
+extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
+#define user_path_walk(name,nd) \
+        __user_walk(name, LOOKUP_FOLLOW, nd)
+#define user_path_walk_link(name,nd) \
+        __user_walk(name, 0, nd)
+extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
+extern int FASTCALL(path_walk(const char *, struct nameidata *));
+extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
+extern void path_release(struct nameidata *);
+extern void path_release_on_umount(struct nameidata *);
+
+extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
+extern struct dentry * lookup_hash(struct qstr *, struct dentry *);
+
+extern int follow_down(struct vfsmount **, struct dentry **);
+extern int follow_up(struct vfsmount **, struct dentry **);
+
+extern struct dentry *lock_rename(struct dentry *, struct dentry *);
+extern void unlock_rename(struct dentry *, struct dentry *);
+
+static inline void nd_set_link(struct nameidata *nd, char *path)
+{
+        nd->saved_names[nd->depth] = path;
+}
+
+static inline char *nd_get_link(struct nameidata *nd)
+{
+        return nd->saved_names[nd->depth];
+}
+
+#endif /* _LINUX_NAMEI_H */