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    dm: support barriers on simple devices · ab4c1424
    Andi Kleen 提交于
    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
    devices.
    
     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: NAndi Kleen <ak@suse.de>
    Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
    ab4c1424
dm-table.c 21.3 KB