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dm cache: add cleaner policy

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A simple cache policy that writes back all data to the origin.

This is used to decommission a dm cache by emptying it.

Signed-off-by: Heinz Mauelshagen <mauelshagen@redhat.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Heinz Mauelshagen
2013-03-01 22:45:52 +00:00
committed by Alasdair G Kergon
parent f283635281
commit 8735a81347
4 changed files with 479 additions and 0 deletions
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Documentation/device-mapper/cache-policies.txt
+5
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@@ -53,6 +53,11 @@ since spindles tend to have good bandwidth. The io_tracker counts
contiguous I/Os to try to spot when the io is in one of these sequential
modes.
cleaner
-------
The cleaner writes back all dirty blocks in a cache to decommission it.
Examples
========