linux-kernel - Re: [PATCH v2 3/4] block: add IOC_PR_READ

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Message-ID: <4ea9e53e-6618-4821-8002-7dc5d1b7194a@suse.de>
Date: Thu, 27 Nov 2025 19:06:07 +0100
From: Hannes Reinecke <hare@...e.de>
To: Stefan Hajnoczi <stefanha@...hat.com>, linux-block@...r.kernel.org
Cc: Keith Busch <kbusch@...nel.org>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 linux-kernel@...r.kernel.org,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Christoph Hellwig <hch@....de>, Mike Christie <michael.christie@...cle.com>,
 linux-nvme@...ts.infradead.org, Jens Axboe <axboe@...nel.dk>,
 linux-scsi@...r.kernel.org, Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH v2 3/4] block: add IOC_PR_READ_KEYS ioctl

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@...hat.com>
> ---
>   include/uapi/linux/pr.h |  7 +++++
>   block/ioctl.c           | 59 +++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 66 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

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