Seems that 4th patch is delayed or lost. I'll post it again if it will not be delivered until tomorrow. From: Dan Smith <danms@xxxxxxxxxx> Subject: Re: Latest dm-userspace kernel code Date: Fri, 29 Sep 2006 19:39:46 -0700 > FT> - What is the purpose of dmu_request->deps? I guess that it is for > FT> preventing I/O being reordered. if so, again, you don't need to do > FT> that. > > Well, the problem is that a block copy would overwrite other requests. > I think that while a copy is happening, you have to be careful to not > write into that block so that your writes are not lost. On second thought, I think that it would be better to handle this in user space. If you add a feature to notify I/O completion of user space (I think this feature is necessary for other reasons too), user-space programs can take care about this easily. I prefer the dm-userspace kernel module to just perform I/Os according to requests from user space. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
