rename generic_setattr

Despite its name it's now a generic implementation of ->setattr, but
rather a helper to copy attributes from a struct iattr to the inode.
Rename it to setattr_copy to reflect this fact.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/libfs.c b/fs/libfs.c
index dcaf972..861a887 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -395,8 +395,7 @@
 			return error;
 	}
 
-	generic_setattr(inode, iattr);
-
+	setattr_copy(inode, iattr);
 	return error;
 }
 EXPORT_SYMBOL(simple_setattr);