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| author | Joe Thornber <ejt@redhat.com> | 2014-03-03 10:23:15 -0500 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2014-03-27 16:56:23 -0400 |
| commit | eec40579d84873dfb7021eb24c50360f073237c5 (patch) | |
| tree | a294d43a2029ab02ceeab33396e7c948e374a571 /drivers/md/Kconfig | |
| parent | b098d6726bbfb94c06d6e1097466187afddae61f (diff) | |
| download | lwn-eec40579d84873dfb7021eb24c50360f073237c5.tar.gz lwn-eec40579d84873dfb7021eb24c50360f073237c5.zip | |
dm: add era target
dm-era is a target that behaves similar to the linear target. In
addition it keeps track of which blocks were written within a user
defined period of time called an 'era'. Each era target instance
maintains the current era as a monotonically increasing 32-bit
counter.
Use cases include tracking changed blocks for backup software, and
partially invalidating the contents of a cache to restore cache
coherency after rolling back a vendor snapshot.
dm-era is primarily expected to be paired with the dm-cache target.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 95ad936e6048..5bdedf6df153 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -285,6 +285,17 @@ config DM_CACHE_CLEANER A simple cache policy that writes back all data to the origin. Used when decommissioning a dm-cache. +config DM_ERA + tristate "Era target (EXPERIMENTAL)" + depends on BLK_DEV_DM + default n + select DM_PERSISTENT_DATA + select DM_BIO_PRISON + ---help--- + dm-era tracks which parts of a block device are written to + over time. Useful for maintaining cache coherency when using + vendor snapshots. + config DM_MIRROR tristate "Mirror target" depends on BLK_DEV_DM |