fs: add filp_clone_open API

[karo-tx-linux.git] / fs / open.c

diff --git a/fs/open.c b/fs/open.c
index 17cb6b1dab753b9de6366f92b6ca3ba3cb204291..bfe6f2b8345f5eabcc24bb889d5023f9b64ff415 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -1002,6 +1002,26 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
 }
 EXPORT_SYMBOL(file_open_root);
 
+struct file *filp_clone_open(struct file *oldfile)
+{
+       struct file *file;
+       int retval;
+
+       file = get_empty_filp();
+       if (IS_ERR(file))
+               return file;
+
+       file->f_flags = oldfile->f_flags;
+       retval = vfs_open(&oldfile->f_path, file, oldfile->f_cred);
+       if (retval) {
+               put_filp(file);
+               return ERR_PTR(retval);
+       }
+
+       return file;
+}
+EXPORT_SYMBOL(filp_clone_open);
+
 long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
 {
        struct open_flags op;