linux-toradex.git/include/scsi/scsi_dh.h, branch v7.0-rc7

scsi: core: Introduce enum scsi_disposition

2021-04-16T02:44:40+00:00

Improve readability of the code in the SCSI core by introducing an
enumeration type for the values used internally that decide how to continue
processing a SCSI command. The eh_*_handler return values have not been
changed because that would involve modifying all SCSI drivers.

The output of the following command has been inspected to verify that no
out-of-range values are assigned to a variable of type enum
scsi_disposition:

KCFLAGS=-Wassign-enum make CC=clang W=1 drivers/scsi/

Link: https://lore.kernel.org/r/20210415220826.29438-6-bvanassche@acm.org
Cc: Christoph Hellwig 
Cc: Johannes Thumshirn 
Cc: Hannes Reinecke 
Cc: Daniel Wagner 
Signed-off-by: Bart Van Assche 
Signed-off-by: Martin K. Petersen

scsi: scsi_dh: Fix a typo

2021-03-25T03:03:43+00:00

s/infrastruture/infrastructure/

[mkp: combined .c and .h patches]

Link: https://lore.kernel.org/r/20210322064724.4108343-1-unixbhaskar@gmail.com
Signed-off-by: Bhaskar Chowdhury 
Signed-off-by: Martin K. Petersen 

frog

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Reviewed-by: Richard Fontana 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman

scsi: return blk_status_t from device handler ->prep_fn

2018-11-10T02:17:14+00:00

Remove the last use of the old BLKPREP_* values, which get converted
to BLK_STS_* later anyway.

Reviewed-by: Johannes Thumshirn 
Reviewed-by: Bart Van Assche 
Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

scsi_dh: add 'rescan' callback

2016-02-24T02:27:02+00:00

If a device needs to be rescanned the device_handler might need
to be rechecked, too.
So add a 'rescan' callback to the device handler and call it
upon scsi_rescan_device(). The rescan callback will be invoked
from the Unit Attention handling of ASC/ASCQ 3F 03
(INQUIRY DATA HAS CHANGED).

Reviewed-by: Bart Van Assche 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: Use separate alua_port_group structure

2016-02-24T02:27:02+00:00

The port group needs to be a separate structure as several
LUNs might belong to the same group.

Reviewed-by: Christoph Hellwig 
Reviewed-by: Ewan Milne 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi_dh: kill struct scsi_dh_data

2015-08-28T20:14:57+00:00

Add a ->handler and a ->handler_data field to struct scsi_device and kill
this indirection.  Also move struct scsi_device_handler to scsi_dh.h so that
changes to it don't require rebuilding every SCSI LLDD.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Martin K. Petersen 
Reviewed-by: Hannes Reinecke 
Signed-off-by: James Bottomley

scsi_dh: integrate into the core SCSI code

2015-08-28T20:14:56+00:00

Stop building scsi_dh as a separate module and integrate it fully into the
core SCSI code with explicit callouts at bus scan time.  For now the
callouts are placed at the same point as the old bus notifiers were called,
but in the future we will be able to look at ALUA INQUIRY data earlier on.

Note that this also means that the device handler modules need to be loaded
by the time we scan the bus.  The next patches will add support for
autoloading device handlers at bus scan time to make sure they are always
loaded if they are enabled in the kernel config.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Martin K. Petersen 
Reviewed-by: Hannes Reinecke 
Acked-by: Mike Snitzer 
Signed-off-by: James Bottomley

dm-mpath, scsi_dh: request scsi_dh modules in scsi_dh, not dm-mpath

2015-08-28T20:14:55+00:00

This way we can reused the same code any attachment method, not just those
requested from dm-mpath.

[jejb: fixup checkpatch error]
Signed-off-by: Christoph Hellwig 
Reviewed-by: Martin K. Petersen 
Reviewed-by: Hannes Reinecke 
Acked-by: Mike Snitzer 
Signed-off-by: James Bottomley

dm-mpath, scsi_dh: don't let dm detach device handlers

2015-08-28T20:14:54+00:00

While allowing dm-mpath to attach device handlers is a functionality we need
for backwards compatibility reason there is no reason to reference count
them and detach them if dm-mpath stops using the device for some reason.

If the device handler works for the given device it can just stay attached,
and we can take the retain_hw_handler codepath.

Signed-off-by: Christoph Hellwig 
Acked-by: Mike Snitzer 
Acked-by: Hannes Reinecke 
Signed-off-by: James Bottomley