open-style analog of vfs_path_lookup()

[linux-block.git] / fs / open.c

diff --git a/fs/open.c b/fs/open.c
index d05e18c60baec9e9b422c57338c01debda07f214..48afc5c139d247e634d9926507d2a8d9354015db 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -959,6 +959,20 @@ struct file *filp_open(const char *filename, int flags, int mode)
 }
 EXPORT_SYMBOL(filp_open);
 
+struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+                           const char *filename, int flags)
+{
+       struct open_flags op;
+       int lookup = build_open_flags(flags, 0, &op);
+       if (flags & O_CREAT)
+               return ERR_PTR(-EINVAL);
+       if (!filename && (flags & O_DIRECTORY))
+               if (!dentry->d_inode->i_op->lookup)
+                       return ERR_PTR(-ENOTDIR);
+       return do_file_open_root(dentry, mnt, filename, &op, lookup);
+}
+EXPORT_SYMBOL(file_open_root);
+
 long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
 {
        struct open_flags op;