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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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drivers/md/Kconfig
+8
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@@ -291,6 +291,14 @@ config DM_CACHE_MQ
This is meant to be a general purpose policy. It prioritises
reads over writes.
config DM_CACHE_CLEANER
tristate "Cleaner Cache Policy (EXPERIMENTAL)"
depends on DM_CACHE
default y
---help---
A simple cache policy that writes back all data to the
origin. Used when decommissioning a dm-cache.
config DM_MIRROR
tristate "Mirror target"
depends on BLK_DEV_DM