[PATCH v2 3/4] block: add IOC_PR_READ_KEYS ioctl

[Hannes Reinecke]

On 11/27/25 16:54, Stefan Hajnoczi wrote:
> Add a Persistent Reservations ioctl to read the list of currently
> registered reservation keys. This calls the pr_ops->read_keys() function
> that was previously added in commit c787f1baa503 ("block: Add PR
> callouts for read keys and reservation") but was only used by the
> in-kernel SCSI target so far.
> 
> The IOC_PR_READ_KEYS ioctl is necessary so that userspace applications
> that rely on Persistent Reservations ioctls have a way of inspecting the
> current state. Cluster managers and validation tests need this
> functionality.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
> ---
>   include/uapi/linux/pr.h |  7 +++++
>   block/ioctl.c           | 59 +++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 66 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare at suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare at suse.de                                +49 911 74053 688
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