[PATCH 0/4]: Add ALUA primary/secondary access state/statusmetadata support

From: Nicholas A. Bellinger
Date: Mon Aug 31 2009 - 04:29:52 EST

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
| |-- iqn.2003-01.org.linux-iscsi.target.i686:sn.cff3eedbd2fd+1
| | `-- lun_0
| `-- iqn.2003-01.org.linux-iscsi.target.i686:sn.e475ed6fcdd0+1
| `-- 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:


Any comments or questions are welcome!


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/