• Mike Christie's avatar
    [SCSI] modify scsi to handle new fail fast flags. · 4a27446f
    Mike Christie authored
    
    
    This checks the errors the scsi-ml determined were retryable
    and returns if we should fast fail it based on the request
    fail fast flags.
    
    Without the patch, drivers like lpfc, qla2xxx and fcoe would return
    DID_ERROR for what it determines is a temporary communication problem.
    There is no loss of connectivity at that time and the driver thinks
    that it would be fast to retry at the driver level. SCSI-ml will however
    sees fast fail on the request and DID_ERROR and will fast fail the io.
    This will then cause dm-multipath to fail the path and possibley switch
    target controllers when we should be retrying at the scsi layer.
    
    We also were fast failing device errors to dm multiapth when
    unless the scsi_dh modules think otherwis we want to retry at
    the scsi layer because multipath can only retry the IO like scsi
    should have done. multipath is a little dumber though because it
    does not what the error was for and assumes that it should fail
    the paths.
    Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
    4a27446f
scsi_lib.c 66.6 KB