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| author | David Disseldorp | 2018-11-07 14:11:07 +0100 |
|---|---|---|
| committer | Martin K. Petersen | 2018-11-22 04:10:36 +0100 |
| commit | b49d6f7885306ee636d5c1af52170f3069ccf5f7 (patch) | |
| tree | 9422920bbe4153c54af39da2e5a0c34c2413677c /drivers/target/target_core_pr.c | |
| parent | scsi: cxgb4i: fix thermal configuration dependencies (diff) | |
| download | kernel-qcow2-linux-b49d6f7885306ee636d5c1af52170f3069ccf5f7.tar.gz kernel-qcow2-linux-b49d6f7885306ee636d5c1af52170f3069ccf5f7.tar.xz kernel-qcow2-linux-b49d6f7885306ee636d5c1af52170f3069ccf5f7.zip | |
scsi: target: add emulate_pr backstore attr to toggle PR support
The new emulate_pr backstore attribute allows for Persistent Reservation
and SCSI2 RESERVE/RELEASE support to be completely disabled. This can be
useful for scenarios such as:
- Ensuring ATS (Compare & Write) usage on recent VMware ESXi initiators.
- Allowing clustered (e.g. tcm-user) backends to block such requests,
avoiding the multi-node reservation state propagation.
When explicitly disabled, PR and RESERVE/RELEASE requests receive Invalid
Command Operation Code response sense data.
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target/target_core_pr.c')
| -rw-r--r-- | drivers/target/target_core_pr.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index 10db5656fd5d..91a2927acd36 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -4095,6 +4095,8 @@ target_check_reservation(struct se_cmd *cmd) return 0; if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) return 0; + if (!dev->dev_attrib.emulate_pr) + return 0; if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) return 0; |