On Mon, Jun 15, 2015 at 08:39:54PM +0200, Johannes Bauer wrote: > Something that I would like to implement first is a device mapper target > that takes three block devices as input: Two equally sized devices (src1 > and src2) and a separate metadata device (meta). I want to map chunks of > the src devices to bits of a bitmap in the meta device. If the bit is > set in the meta device decides whether src1 and src2 is returned. The dm-switch target already provides this functionality under the control of userspace. Userspace can maintain/monitor your metadata device and send messages to the kernel whenever there are changes. Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
