• Mikulas Patocka's avatar
    dm ioctl: allow message to return data · a2606241
    Mikulas Patocka authored
    This patch introduces enhanced message support that allows the
    device-mapper core to recognise messages that are common to all devices,
    and for messages to return data to userspace.
    
    Core messages are processed by the function "message_for_md".  If the
    device mapper doesn't support the message, it is passed to the target
    driver.
    
    If the message returns data, the kernel sets the flag
    DM_MESSAGE_OUT_FLAG.
    Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
    a2606241
dm-ioctl.c 40.2 KB