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

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Date:	Mon, 20 May 2013 15:14:58 +0800
From:	Ren Mingxin <renmx@...fujitsu.com>
To:	James.Bottomley@...senPartnership.com, james.smart@...lex.com,
	Nagalakshmi.Nandigama@....com, Sreekanth.Reddy@....com,
	michaelc@...wisc.edu
Cc:	robert.w.love@...el.com, dgilbert@...erlog.com, hare@...e.de,
	bprakash@...adcom.com, agk@...hat.com, neilb@...e.de,
	gregkh@...uxfoundation.org, axboe@...nel.dk, tj@...nel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: [PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

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.

Thanks,
Ren

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(-)

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