[PATCH v2 0/4] block: add IOC_PR_READ_KEYS and IOC_PR_READ_RESERVATION ioctls

Stefan Hajnoczi
2025-11-27T15:54:34Z

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(-)

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2.52.0