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Subject[PATCH 0/4]: Add ALUA primary/secondary access state/status metadata support
Greeting SCSI and multipath folks,

This patch series to TCM/LIO v3.1 kernel code in lio-core-2.6.git adds support for struct file ALUA metadata
of primary/secondary access state/status to /var/target/alua/, which allows the ALUA metadata to be loaded
into configfs attributes at TCM + fabric bringup time to reinstate the last saved ALUA metadata across target
power loss, reboots, et al.

Here is what an example running layout of metadata in /var/target/alua looks like:

target:/mnt/sdb/lio-core-2.6.git# tree /var/target/alua/
|-- iSCSI # These are for fabric dependent Port/LUN ALUA secondary access metadata
| |--
| | `-- lun_0
| `--
| `-- lun_0
| # These are for TCM storage object target port group ALUA primary access metadata
|-- tpgs_41ee70ff-4fbe-4fb8-a690-b3c65639db10
|-- tpgs_96eb8120-f0fc-40ce-b673-8ac302aa6b4e
`-- tpgs_a97e4ce21c0711de829b000c2943d57b
|-- lio_alua_east
`-- lio_alua_west

This patch series includes new EXPORT_SYMBOL() calls to target_core_alua.c that add generic configfs
store/show handlers for fabric dependent configfs attribute code, as well as the modification to
LIO-Target/ConfigFS to use these generic handlers. Also, code has been added for calling filp_open() ->
vfs_writev() -> flip_close() for updating the actual struct file in both primary/secondary access state
transitions for both explict (via MO SET_TARGET_PORT_GROUPS) and implict (via configfs) ALUA operations.

[PATCH 1/4] [Target_Core_Mod/ALUA]: Add support for saving primary port metadata across target power loss
[PATCH 2/4] [Target_Core_Mod/ALUA]: Add support for saving secondary fabric port metadata across target power loss
[PATCH 3/4] [Target_Core_Mod]: Add alua mutex initialization in core_alloc_port()
[PATCH 4/4] [LIO-Target/ConfigFS]: Add ALUA secondary access state attributes for saving/reading metadata

drivers/lio-core/iscsi_target_configfs.c | 54 +++++++
drivers/target/target_core_alua.c | 232 +++++++++++++++++++++++++++++-
drivers/target/target_core_configfs.c | 75 ++++++++++-
drivers/target/target_core_device.c | 1 +
include/target/target_core_alua.h | 17 ++-
include/target/target_core_base.h | 7 +
6 files changed, 378 insertions(+), 8 deletions(-)

The userspace commits to make it all go can be found here:;a=commitdiff;h=3dbe22aa3941dbf0126490e95e50a2f536721f3e;a=commitdiff;h=494e2f6d1163227602d2336cd65d57bf2cf07e78;a=commitdiff;h=e632383be4ac3634325551b8fbc152bb2d2f5fc2;a=commitdiff;h=4917f200458845468db33b6abd30c1a0cc64fbba;a=commitdiff;h=c0d26101ee33aaf284b7b86391cf7c70c9859816;a=commitdiff;h=fa48c904073a878b36e0b92eda28faebea55aafc

Any comments or questions are welcome!


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