• Mike Christie's avatar
    [SCSI] block: separate failfast into multiple bits. · 6000a368
    Mike Christie authored
    Multipath is best at handling transport errors. If it gets a device
    error then there is not much the multipath layer can do. It will just
    access the same device but from a different path.
    
    This patch breaks up failfast into device, transport and driver errors.
    The multipath layers (md and dm mutlipath) only ask the lower levels to
    fast fail transport errors. The user of failfast, read ahead, will ask
    to fast fail on all errors.
    
    Note that blk_noretry_request will return true if any failfast bit
    is set. This allows drivers that do not support the multipath failfast
    bits to continue to fail on any failfast error like before. Drivers
    like scsi that are able to fail fast specific errors can check
    for the specific fail fast type. In the next patch I will convert
    scsi.
    Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
    Cc: Jens Axboe <jens.axboe@oracle.com>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
    6000a368
scsi_dh_rdac.c 16 KB