On Wed, May 10, 2017 at 03:20:41PM +0300, Boaz Harrosh wrote: > Would you not want to call ->read_iter() in the NULL case > and have all FSs supported as today? As IMA has particular requirements on the fs (e.g. that it can read with i_rwsem held as seen in this patch, or useful i_version which only the file systems converted in this patch do), having an explicit opt-in seems much safer. This optional method is a very easy way to provide this opt-in behavior.
