On 2/24/2023 9:44 AM, Mike Christie wrote: > Add callouts for reading keys and reservations. This allows LIO to support > the READ_KEYS and READ_RESERVATION commands and will allow dm-multipath > to optimize it's error handling so it can check if it's getting an error > because there's an existing reservation or if we need to retry different > paths. > > Note: This only initially adds the struct definitions in the kernel as I'm > not sure if we wanted to export the interface to userspace yet. read_keys > and read_reservation are exactly what dm-multipath and LIO need, but for a > userspace interface we may want something like SCSI's READ_FULL_STATUS and > NVMe's report reservation commands. Those are overkill for dm/LIO and > READ_FULL_STATUS is sometimes broken for SCSI devices. > > Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx> > --- Looks good. Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> -ck
