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