1. 27 Mar, 2014 1 commit
    • Joe Thornber's avatar
      dm: add era target · eec40579
      Joe Thornber authored
      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: default avatarJoe Thornber <ejt@redhat.com>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      eec40579