diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2025-12-01 16:43:28 -0500 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-12-04 07:19:26 -0700 |
| commit | 22a1ffea5f805dfa21b64d1c7b5fe39c0c78c997 (patch) | |
| tree | a01b01e3796c89191f571cebd0181c9473838806 /include | |
| parent | 38ec8469f39e0e96e7dd9b76f05e0f8eb78be681 (diff) | |
block: add IOC_PR_READ_KEYS ioctl
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@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/pr.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/uapi/linux/pr.h b/include/uapi/linux/pr.h index d8126415966f..fcb74eab92c8 100644 --- a/include/uapi/linux/pr.h +++ b/include/uapi/linux/pr.h @@ -56,6 +56,12 @@ struct pr_clear { __u32 __pad; }; +struct pr_read_keys { + __u32 generation; + __u32 num_keys; + __u64 keys_ptr; +}; + #define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */ #define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration) @@ -64,5 +70,6 @@ struct pr_clear { #define IOC_PR_PREEMPT _IOW('p', 203, struct pr_preempt) #define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt) #define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear) +#define IOC_PR_READ_KEYS _IOWR('p', 206, struct pr_read_keys) #endif /* _UAPI_PR_H */ |