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Joe Thornber authored
Add a threshold callback function to the persistent data space map interface for a subsequent patch to use. dm-thin and dm-cache are interested in knowing when they're getting low on metadata or data blocks. This patch introduces a new method for registering a callback against a threshold. Signed-off-by:
Joe Thornber <ejt@redhat.com> Signed-off-by:
Alasdair G Kergon <agk@redhat.com>
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