• Mike Hibler's avatar
    Machinery for supporting multiple RO/RW clones of a dataset in one experiment. · 72fb6763
    Mike Hibler authored
    Mostly ptopgen/libvtop changes to get things through assign.
    
    Added a new virt_blockstore_attribute, 'prereserve' that can be applied to
    a RW clone to pre-allocate the full amount of space allocated to the volume
    being cloned. This is instead of the default "sparse" clone which could run
    out of space at an inopportune time if the containing pool runs out of space.
    But it doesn't work yet.
    
    Everything is there in the front end to do the necessary capacity checks and
    allocations of space, but then I discovered that ZFS doesn't readily support
    a non-sparse clone! You can do this, I think, by tweaking the "refreserved"
    attribute of the volume after it is created but that would have to be done
    behind the back of FreeNAS and I would have to do some more testing before I
    am willing to go here.
    
    So for now, all clones are sparse and no one is charged for their usage.
    72fb6763
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