[PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

From: Ren Mingxin
Date: Mon May 20 2013 - 03:14:22 EST

When there is a scsi command timed-out or failed, the scsi eh
tries a thorugh recovery, which is necessary for non-redundant
systems. However, the thorugh recovery usually takes much time,
which is not acceptable for misson critical systems. To improve
this latency, if we are working on a redundant system, we should
avoid the scsi eh for its long time failing recovery, and quick
failover to another path.

This set of patches is trying to implement above.

NOTE: the userland tools need to eusure the environment
restriction, which will be implemented later.


Ren Mingxin (5):
scsi: rename return code FAST_IO_FAIL to FAST_IO
FC transport: Add interface to specify fast io level for timed-out cmds
SAS transport: Add interface to specify fast io level for timed-out cmds
lpfc: Allow fast timed-out io recovery
mptfusion: Allow fast timed-out io recovery

drivers/message/fusion/mptscsih.c | 29 ++++++++-
drivers/scsi/lpfc/lpfc_scsi.c | 34 ++++++++++
drivers/scsi/scsi_error.c | 18 ++---
drivers/scsi/scsi_sas_internal.h | 4 -
drivers/scsi/scsi_transport_fc.c | 112 ++++++++++++++++++++++++++++++++++--
drivers/scsi/scsi_transport_iscsi.c | 6 -
drivers/scsi/scsi_transport_sas.c | 103 ++++++++++++++++++++++++++++++++-
include/scsi/scsi.h | 2
include/scsi/scsi_transport_fc.h | 11 +++
include/scsi/scsi_transport_sas.h | 8 ++
10 files changed, 303 insertions(+), 24 deletions(-)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/