* [PATCH 0/2] [Target_Core_Mod] Add running SPC-3 Persistent Reservation logic
@ 2009-01-28 7:40 Nicholas A. Bellinger
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From: Nicholas A. Bellinger @ 2009-01-28 7:40 UTC (permalink / raw)
To: Linux-iSCSI.org Target Dev
Cc: LKML, linux-scsi, James Bottomley, Andrew Morton,
Christoph Hellwig, Martin K. Petersen, Joel Becker,
Hannes Reinecke, Ming Zhang, Arne Redlich, Ross S. W. Walker,
Rafiu Fakunle, Mike Christie, FUJITA Tomonori
Greetings all,
This patch series adds the first running SPC-3 compliant Persistent Reservation
emulation support for PROUT REGISTER -> PROUT RESERVE -> PRIN READ_RESERVATIONS ->
PROUT RELEASE -> PROUT UNREGISTER, tested and running with Doug Gilbert's
very excellent sg_persist command. This was tested against Open/iSCSI Initiators
running LIO-Target iSCSI/TCP, and Core-iSCSI Initiators running LIO-Target iSCSI/SCTP.
I will be adding information about TCM/LIO-Target v3.0 and LIO-Target v2.9 usage wrt
Persistent Reservations on to the http://Linux-iSCSI.org wiki at some point as well,
so folks can get their own SPC-3 compliant PR enabled Linux/iSCSI Targets up and running!
This patch is made against lio-core-2.6.git/master and tested on v2.6.29-rc2 x86
32-bit HVM. The lio-core-2.6.git tree can be found at:
http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=summary
Subject: [PATCH 1/2] [Target_Core_Mod/PERSISTENT_RESERVATION]: Add Service Action RESERVE/RELEASE w/ all_tg_pt=[0,1]
Subject: [PATCH 2/2] [Target_Core_Mod/ConfigFS]: Updates for PERSISTENT_RESERVE
Unpacking objects: 100% (12/12), done.
>From /pub/scm/linux/kernel/git/nab/lio-core-2.6
* branch master -> FETCH_HEAD
Updating a4bcd2c..ab56467
Fast forward
drivers/lio-core/target_core_base.h | 3 +-
drivers/lio-core/target_core_configfs.c | 116 +++++++++--
drivers/lio-core/target_core_pr.c | 354 ++++++++++++++++++++++++++++++-
drivers/lio-core/target_core_pr.h | 1 +
4 files changed, 446 insertions(+), 28 deletions(-)
Here is what it looks like in action, starting from the start, with no
PR registrations or reservations, lets have a look via Target_Core_Mod/ConfigFS
for a Linux LVM block device:
*) The setup...
Here is waht things now look like in Target_Core_Mod/ConfigFS for each
$HBA/$STORAGE_OBJECT, in this example, a Linux LVM struct block_device named
'lvm_test0' is used for the ConfigFS $STORAGE_OBJECT:
`-- target
|-- core
| |-- iblock_0
| | |-- hba_info
| | `-- lvm_test0
<SNIP>
| | |-- pr
| | | |-- res_holder
| | | |-- res_pr_all_tgt_pts
| | | |-- res_pr_generation
| | | |-- res_pr_registered_i_pts
| | | |-- res_pr_type
| | | `-- res_type
| | `-- wwn
| | |-- evpd_assoc_logical_unit
| | |-- evpd_assoc_scsi_target_device
| | |-- evpd_assoc_target_port
| | |-- evpd_protocol_identifier
| | `-- evpd_unit_serial
<SNIP>
initiator# # sg_persist --in --report-capabilities -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation In cmd: 5e 02 00 00 00 00 00 20 00 00
Report capabilities response:
Compatible Reservation Handling(CRH): 0
Specify Initiator Ports Capable(SIP_C): 0
All Target Ports Capable(ATP_C): 1
Persist Through Power Loss Capable(PTPL_C): 0
Type Mask Valid(TMV): 1
Allow commands: 1
Persist Through Power Loss Active(PTPL_A): 0
Support indicated in Type mask:
Write Exclusive, all registrants: 0
Exclusive Access, registrants only: 0
Write Exclusive, registrants only: 0
Exclusive Access: 1
Write Exclusive: 1
Exclusive Access, all registrants: 0
target# cat /sys/kernel/config/target/core/iblock_0/lvm_test0/pr/*
No SPC-3 Reservation holder
No SPC-3 Reservation holder
0x00000000
SPC-3 PR Registrations:
None
No SPC-3 Reservation holder
SPC3_PERSISTENT_RESERVATIONS
*) PROUT REGISTER:
initiator# sg_persist --out --register --param-sark=0x5678efff --param-alltgpt -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation Out cmd: 5f 00 00 00 00 00 00 00 18 00
PR out: command (Register) successful
target# cat /sys/kernel/config/target/core/iblock_0/lvm_test0/pr/*
No SPC-3 Reservation holder
No SPC-3 Reservation holder
0x00000001
SPC-3 PR Registrations:
iSCSI Node: iqn.1993-08.org.debian:01:2dadf92d0ef Key: 0x000000005678efff PRgen: 0x00000000
No SPC-3 Reservation holder
SPC3_PERSISTENT_RESERVATIONS
*) PROUT RESERVE: With a prout_type=1 for PR Type: WRITE_EXCLUSIVE (0x01)
initiator# sg_persist --out --reserve --param-rk=0x5678efff --prout-type=1 -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation Out cmd: 5f 01 01 00 00 00 00 00 18 00
PR out: command (Reserve) successful
target# cat /sys/kernel/config/target/core/iblock_0/lvm_test0/pr/*
SPC-3 Reservation FABRIC[iSCSI]: Initiator: iqn.1993-08.org.debian:01:2dadf92d0ef
SPC-3 Reservation holder: All Target Ports reserved
0x00000001
SPC-3 PR Registrations:
iSCSI Node: iqn.1993-08.org.debian:01:2dadf92d0ef Key: 0x000000005678efff PRgen: 0x00000000
SPC-3 Reservation Type: Write Exclusive Access
SPC3_PERSISTENT_RESERVATIONS
*) PRIN READ_RESERVATIONS:
initiator# sg_persist --in --read-reservation -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation In cmd: 5e 01 00 00 00 00 00 20 00 00
PR generation=0x1, Reservation follows:
Key=0x5678efff
scope: LU_SCOPE, type: Write Exclusive
*) PROUT RELEASE:
initiator# sg_persist --out --release --param-rk=0x5678efff --prout-type=1 -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation Out cmd: 5f 02 01 00 00 00 00 00 18 00
PR out: command (Release) successful
target# cat /sys/kernel/config/target/core/iblock_0/lvm_test0/pr/*
No SPC-3 Reservation holder
No SPC-3 Reservation holder
0x00000001
SPC-3 PR Registrations:
iSCSI Node: iqn.1993-08.org.debian:01:2dadf92d0ef Key: 0x000000005678efff PRgen: 0x00000000
No SPC-3 Reservation holder
SPC3_PERSISTENT_RESERVATIONS
*) PRIN UNREGISTER:
initiator# sg_persist --out --register --param-rk=0x5678efff --param-sark=0 -v /dev/sde
inquiry cdb: 12 00 00 00 24 00
LIO-ORG IBLOCK v3.0
Peripheral device type: disk
Persistent Reservation Out cmd: 5f 00 00 00 00 00 00 00 18 00
PR out: command (Register) successful
target#cat /sys/kernel/config/target/core/iblock_0/lvm_test0/pr/*
No SPC-3 Reservation holder
No SPC-3 Reservation holder
0x00000001
SPC-3 PR Registrations:
None
No SPC-3 Reservation holder
SPC3_PERSISTENT_RESERVATIONS
Comments..?
--nab
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