linux-kernel - [PATCH v2 0/4] block: add IOC_PR_READ_KEYS and IOC_PR_READ

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Message-ID: <20251127155424.617569-1-stefanha@redhat.com>
Date: Thu, 27 Nov 2025 10:54:20 -0500
From: Stefan Hajnoczi <stefanha@...hat.com>
To: 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>,
	Stefan Hajnoczi <stefanha@...hat.com>
Subject: [PATCH v2 0/4] block: add IOC_PR_READ_KEYS and IOC_PR_READ_RESERVATION ioctls

v2:
- Fix num_keys validation in patches 1-3 [Hannes]
- Declare local variables at beginning of scope [Hannes]

This series exposes struct pr_ops pr_read_keys() and pr_read_reservations() to
userspace as ioctls, making it possible to list registered reservation keys and
report the current reservation on a block device.

The new ioctls are needed by applications or cluster managers that rely on
inspecting the PR state. This is something that has been possible with SCSI-
and NVME-specific commands but not with the PR ioctls. I hope to move QEMU from
SG_IO to PR ioctls so that NVMe host block devices can be supported alongside
SCSI devices without protocol-specific commands.

These ioctls will also make troubleshooting possible with the blkpr(8)
util-linux tool, for which I have prepared a separate patch series.

Stefan Hajnoczi (4):
  scsi: sd: reject invalid pr_read_keys() num_keys values
  nvme: reject invalid pr_read_keys() num_keys values
  block: add IOC_PR_READ_KEYS ioctl
  block: add IOC_PR_READ_RESERVATION ioctl

 include/uapi/linux/pr.h | 14 +++++++
 block/ioctl.c           | 87 +++++++++++++++++++++++++++++++++++++++++
 drivers/nvme/host/pr.c  |  4 ++
 drivers/scsi/sd.c       | 11 +++++-
 4 files changed, 115 insertions(+), 1 deletion(-)

-- 
2.52.0