On Mon, 25 Feb 2013 21:35:08 -0800 Suman C <schakrava@xxxxxxxxx> wrote: > Yes, zvol like feature where a btrfs subvolume like construct can be > made available as a LUN/block device. This device can then be used by > any application that wants a raw block device. iscsi is another > obvious usecase. Having thin provisioning support would make it pretty > awesome. I think what you are missing is that btrfs is a filesystem, not a block device management mechanism. For your use case can simply create a snapshot and then make a sparse file inside of it. btrfs sub create foobar dd if=/dev/zero of=foobar/100GB.img bs=1 count=1 seek=100G If you need this to be a block device, use 'losetup' to make foobar/100GB.img appear as one (/dev/loopX). But iSCSI/AoE/NBD can export files as well as block devices, so this is not even necessary. -- With respect, Roman
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