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Add scratch space re-use functionality to LCOW snapshotter
Currently we would create a new disk and mount this into the LCOW UVM for every container but there are certain scenarios where we'd rather just mount a single disk and then have every container share this one storage space instead of every container having it's own xGB of space to play around with. This is accomplished by just making a symlink to the disk that we'd like to share and then using ref counting later on down the stack in hcsshim if we see that we've already mounted this disk. Signed-off-by: Daniel Canter <dcanter@microsoft.com>
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