• 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