Hi all,
here is an update to the ALUA device handler. The main
features are:
- Topology discovery: the device handler creates a separate
port_group structure, which is used to update all paths to
the same port group. With that we achieve a significant
reduction of the number of RTPGs.
- Asynchronous state update: The ALUA state is now updated
from a workqueue item, so all concurrent RTPG calls are
coaleasced. The ALUA state update is also triggered by
sense codes indicating an ALUA state change.
- Use the existing vpd page 0x83 to detect device IDs
The patchset is relative to the V4 version of the scsi_dh update.
The entire tree can be found at
kernel/hare/scsi-devel branch alua.v4
on git.kernel.org
As usual, reviews and comments are welcome.
Changes to v1:
- Split off rtpg workqueue into separate items
- User per-port workqueues
- Incorporate review from Bart
- Incorporate review from hch
Changes to v2:
- Fixup patch descriptions
- Split off 'Improve error handling' patch
Changes to v3:
- Implement generic 'scsi_vpd_lun_id()' function to parse vpd page 0x83
Hannes Reinecke (23):
scsi_dh_alua: Disable ALUA handling for non-disk devices
scsi_dh_alua: Use vpd_pg83 information
scsi_dh_alua: improved logging
scsi_dh_alua: use standard logging functions
scsi_dh_alua: return standard SCSI return codes in submit_rtpg
scsi_dh_alua: fixup description of stpg_endio()
scsi: remove scsi_show_sense_hdr()
scsi_dh_alua: use flag for RTPG extended header
scsi_dh_alua: use unaligned access macros
scsi_dh_alua: Pass buffer as function argument
scsi_dh_alua: Make stpg synchronous
scsi_dh_alua: switch to scsi_execute_req_flags()
scsi_dh_alua: Use separate alua_port_group structure
scsi_dh_alua: allocate RTPG buffer separately
scsi_dh_alua: simplify sense code handling
scsi: Add scsi_vpd_lun_id()
scsi_dh_alua: use unique device id
revert "scsi_dh_alua: ALUA hander attach should succeed while TPG is
transitioning"
scsi_dh_alua: Use workqueue for RTPG
scsi_dh_alua: Recheck state on unit attention
scsi_dh_alua: update all port states
scsi_dh_alua: Send TEST UNIT READY to poll for transitioning
scsi_dh_alua: Update version to 2.0
drivers/scsi/device_handler/scsi_dh_alua.c | 1140 +++++++++++++++++-----------
drivers/scsi/scsi_lib.c | 121 +++
include/scsi/scsi_dbg.h | 2 -
include/scsi/scsi_device.h | 1 +
4 files changed, 838 insertions(+), 426 deletions(-)
--
1.8.5.6
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