I've started working on discard support a little bit more, and I think it's time to get an overview over the state we're in right now. This patchswt is what I needed to get the batched discard support in XFS properly working. Many patches are just forward ported from Matthew's SSD tree and I hope quilt mail didn't lose the attributions. There are however a few significant changes: - blkdev_issue_discard is now a lot more generic - it grows a flags argument to control if we issue a barrier discard request or not or if we wait or not. That is needed for the batched discard support in XFS which wants to wait just like the ioctl interface. - I have implemented support for sending WRITE SAME requests with the unmap bit set in sd. This has been tested with a qemu-based backed only so far, but we'll get some real array coverage soon. - there is a new patch to allow larger discard requests. - the last patch is just my old batched discard patch for xfs ported to work ontop of this series. I would really love to see some progress on this in the 2.6.32 circle. We should at least get the block layer bits in that allow implementing a somewhat useful discard function. I would also love to see the actual scsi and libata implementations in so that we can start playing around with it. But given the speed up the current TRIM implementations and the expectations for WRITE SAME we should make sure the exact TRIM tracking is not actually enabled anywhere by default for now. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
