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| author | David Disseldorp <ddiss@suse.de> | 2018-11-07 14:11:07 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-11-21 22:10:36 -0500 |
| commit | b49d6f7885306ee636d5c1af52170f3069ccf5f7 (patch) | |
| tree | 9422920bbe4153c54af39da2e5a0c34c2413677c /drivers/target/target_core_spc.c | |
| parent | 8d0bb86e2cf6c96d88c3de56a2a29329872c454d (diff) | |
| download | linux-next-b49d6f7885306ee636d5c1af52170f3069ccf5f7.tar.gz | |
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_spc.c')
| -rw-r--r-- | drivers/target/target_core_spc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c index f459118bc11b..5c49eb6f4929 100644 --- a/drivers/target/target_core_spc.c +++ b/drivers/target/target_core_spc.c @@ -1281,6 +1281,14 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) struct se_device *dev = cmd->se_dev; unsigned char *cdb = cmd->t_task_cdb; + if (!dev->dev_attrib.emulate_pr && + ((cdb[0] == PERSISTENT_RESERVE_IN) || + (cdb[0] == PERSISTENT_RESERVE_OUT) || + (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || + (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { + return TCM_UNSUPPORTED_SCSI_OPCODE; + } + switch (cdb[0]) { case MODE_SELECT: *size = cdb[4]; |