• Andi Kleen's avatar
    dm: support barriers on simple devices · ab4c1424
    Andi Kleen authored
    Implement barrier support for single device DM devices
    This patch implements barrier support in DM for the common case of dm linear
    just remapping a single underlying device. In this case we can safely
    pass the barrier through because there can be no reordering between
     NB. Any DM device might cease to support barriers if it gets
         reconfigured so code must continue to allow for a possible
         -EOPNOTSUPP on every barrier bio submitted.  - agk
    Signed-off-by: default avatarAndi Kleen <ak@suse.de>
    Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
device-mapper.h 10 KB