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[PATCH v2 0/4] scsi_dh_alua: fix stuck I/O after unavailable/standby states

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Currently, scsi_dh_alua fails I/O requests early on once ALUA state
unavailable/standby occur, which prevents path checkers to actually
check if I/O still fails or now works.

Then I/O requests are blocked indefinitely due to queue_if_no_path
but the underlying individual paths are fully operational, and can
be verified as such otherways (e.g., SG_IO).

This patchset addresses that problem, and adds a few improvements
to the logging of PG state changes.

Patch 1 fixes the problem.
Patch 2 makes sure that state changes for all PGs are logged.
Patch 3 makes sure that state no-changes for PGs in unavailable/standby
        are not logged - only changes are.
Patch 4 adds few sdev_dbg() calls to track the path to alua_rtpg_work()

Tested on v4.12+ (commit b4b8cbf679c4).

Mauricio Faria de Oliveira (4):
  scsi: scsi_dh_alua: allow I/O in target port unavailable and standby
    states
  scsi: scsi_dh_alua: print changes to RTPG state of all PGs
  scsi: scsi_dh_alua: do not print RTPG state if it remains
    unavailable/standby
  scsi: scsi_dh_alua: add sdev_dbg() to track alua_rtpg_work()

 drivers/scsi/device_handler/scsi_dh_alua.c | 129 +++++++++++++++++++++++++----
 1 file changed, 113 insertions(+), 16 deletions(-)

-- 
1.8.3.1

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[PATCH v2 0/4] scsi_dh_alua: fix stuck I/O after unavailable/standby states Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 00:50 +0200
  [PATCH v2 3/4] scsi: scsi_dh_alua: do not print RTPG state if it remains unavailable/standby Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 00:50 +0200
    [PATCH] scsi: scsi_dh_alua: fix boolreturn.cocci warnings kbuild test robot <lkp@intel.com> - 2017-07-11 16:20 +0200
    Re: [PATCH v2 3/4] scsi: scsi_dh_alua: do not print RTPG state if it  remains unavailable/standby kbuild test robot <lkp@intel.com> - 2017-07-11 16:20 +0200
  [PATCH v2 4/4] scsi: scsi_dh_alua: add sdev_dbg() to track alua_rtpg_work() Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 00:50 +0200
  [PATCH v2 1/4] scsi: scsi_dh_alua: allow I/O in target port unavailable and standby states Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 00:50 +0200
    Re: [PATCH v2 1/4] scsi: scsi_dh_alua: allow I/O in target port  unavailable and standby states Hannes Reinecke <hare@suse.de> - 2017-07-11 11:20 +0200
      Re: [PATCH v2 1/4] scsi: scsi_dh_alua: allow I/O in target port  unavailable and standby states Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 17:40 +0200
        Re: [PATCH v2 1/4] scsi: scsi_dh_alua: allow I/O in target port  unavailable and standby states Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 23:10 +0200
  Re: [PATCH v2 0/4] scsi_dh_alua: fix stuck I/O after  unavailable/standby states Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> - 2017-07-11 01:00 +0200

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