Am Mittwoch, den 29.10.2008, 15:43 +0000 schrieb Alasdair G Kergon: > On Wed, Oct 29, 2008 at 04:07:30PM +0100, Heinz Mauelshagen wrote: > > Am Mittwoch, den 29.10.2008, 13:56 +0000 schrieb Alasdair G Kergon: > > > On Wed, Oct 29, 2008 at 02:02:08PM +0100, Heinz Mauelshagen wrote: > > > The validation should be consistent between userspace and kernel. > > It should be sufficiently restrictive in the kernel to prevent > > programming errors causing oopses. It can be called via the kernel > > interface by any application anyway, so doesn't need to enforce our > > uspace restrictions (think direct IOCTL calls). > > Surely the validation in the two places should match? I'm arguing, that the kernel should only restrict to prevent against programming errors. > Why would userspace need a tighter restriction than the kernel? Because of specific application requirements. Why shouldn't we support 2 sector dirty log region sizes for any application who wants them ? > One or the other is incorrect. > - E.g. Does kcopyd handle sub-page regions OK now? kcopyd allows copying io regions of single sectors. Heinz > > Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
