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 V3 version of the scsi_dh update.
The entire tree can be found at
kernel/hare/scsi-devel branch alua.v3
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
Hannes Reinecke (20):
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: Improve error handling
scsi: remove scsi_show_sense_hdr()
scsi_dh_alua: use flag for RTPG extended header
scsi_dh_alua: Pass buffer as function argument
scsi_dh_alua: Make stpg synchronous
scsi_dh_alua: switch to scsi_execute()
scsi_dh_alua: put sense buffer on stack
scsi_dh_alua: Use separate alua_port_group structure
scsi_dh_alua: allocate RTPG buffer separately
scsi_dh_alua: simplify sense code handling
scsi_dh_alua: parse target 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 | 1231 ++++++++++++++++++----------
include/scsi/scsi_dbg.h | 2 -
2 files changed, 809 insertions(+), 424 deletions(-)
--
1.8.5.2
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