Re: [PATCH 4/4] block: add IOC_PR_READ_RESERVATION ioctl

Hannes Reinecke
2025-11-27T07:07:55Z

On 11/26/25 17:36, Stefan Hajnoczi wrote:
> Add a Persistent Reservations ioctl to read the current reservation.
> This calls the pr_ops->read_reservation() 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_RESERVATION 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@redhat.com>
> ---
> include/uapi/linux/pr.h | 7 +++++++
> block/ioctl.c | 28 ++++++++++++++++++++++++++++
> 2 files changed, 35 insertions(+)
>
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich