diff options
| author | Mike Christie <michael.christie@oracle.com> | 2023-04-07 15:05:48 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-04-11 21:55:36 -0400 |
| commit | 53062ace0b6e47f17cae2db453858c8a369a2fe4 (patch) | |
| tree | 392b7de4823f0a37a558310fe0a4d3fde331b17c /include/target | |
| parent | 0217da08c1b904be49ac141442bbc1671d3630e7 (diff) | |
scsi: target: Allow backends to hook into PR handling
For the cases where you want to export a device to a VM via a single
I_T nexus and want to passthrough the PR handling to the physical/real
device you have to use pscsi or tcmu. Both are good for specific uses
however for the case where you want good performance, and are not using
SCSI devices directly (using DM/MD RAID or multipath devices) then we are
out of luck.
The following patches allow iblock to mimimally hook into the LIO PR code
and then pass the PR handling to the physical device. Note that like with
the tcmu an pscsi cases it's only supported when you export the device via
one I_T nexus.
This patch adds the initial LIO callouts. The next patch will modify
iblock.
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230407200551.12660-16-michael.christie@oracle.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/target')
| -rw-r--r-- | include/target/target_core_backend.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index c5df78959532..739df993aa5e 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -69,6 +69,10 @@ struct exec_cmd_ops { sense_reason_t (*execute_write_same)(struct se_cmd *cmd); sense_reason_t (*execute_unmap)(struct se_cmd *cmd, sector_t lba, sector_t nolb); + sense_reason_t (*execute_pr_out)(struct se_cmd *cmd, u8 sa, u64 key, + u64 sa_key, u8 type, bool aptpl); + sense_reason_t (*execute_pr_in)(struct se_cmd *cmd, u8 sa, + unsigned char *param_data); }; int transport_backend_register(const struct target_backend_ops *); |