[PATCH v6 15/18] scsi: target: Allow backends to hook into PR handling

[Hannes Reinecke]

On 4/7/23 22:05, Mike Christie wrote:
> 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 at oracle.com>
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> ---
>   drivers/target/target_core_pr.c      | 62 +++++++++++++++++++++++++++-
>   include/target/target_core_backend.h |  4 ++
>   2 files changed, 65 insertions(+), 1 deletion(-)
> Reviewed-by: Hannes Reinecke <hare at suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
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