On Wed, Oct 26, 2016 at 05:46:11PM -0400, Mikulas Patocka wrote: > I think the proper thing would be to move "discard_zeroes_data" flag into > the bio itself - there would be REQ_OP_DISCARD and REQ_OP_DISCARD_ZERO - > and if the device doesn't support REQ_OP_DISCARD_ZERO, it rejects the bio > and the caller is supposed to do zeroing manually. Yes, Martin and I have come to a similar conclusion recently. An additional aspect is that NVMe has a Write Zeroes command which is more limited than what REQ_OP_WRITE_SAME does. So I think the right way is to add a REQ_OP_WRITE_ZEROES (or REQ_OP_ZERO) and have modifies if it may discard or not. -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
