1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI_PR_H
3#define _UAPI_PR_H
4
5#include <linux/types.h>
6
7enum pr_status {
8	PR_STS_SUCCESS			= 0x0,
9	/*
10	 * The following error codes are based on SCSI, because the interface
11	 * was originally created for it and has existing users.
12	 */
13	/* Generic device failure. */
14	PR_STS_IOERR			= 0x2,
15	PR_STS_RESERVATION_CONFLICT	= 0x18,
16	/* Temporary path failure that can be retried. */
17	PR_STS_RETRY_PATH_FAILURE	= 0xe0000,
18	/* The request was failed due to a fast failure timer. */
19	PR_STS_PATH_FAST_FAILED		= 0xf0000,
20	/* The path cannot be reached and has been marked as failed. */
21	PR_STS_PATH_FAILED		= 0x10000,
22};
23
24enum pr_type {
25	PR_WRITE_EXCLUSIVE		= 1,
26	PR_EXCLUSIVE_ACCESS		= 2,
27	PR_WRITE_EXCLUSIVE_REG_ONLY	= 3,
28	PR_EXCLUSIVE_ACCESS_REG_ONLY	= 4,
29	PR_WRITE_EXCLUSIVE_ALL_REGS	= 5,
30	PR_EXCLUSIVE_ACCESS_ALL_REGS	= 6,
31};
32
33struct pr_reservation {
34	__u64	key;
35	__u32	type;
36	__u32	flags;
37};
38
39struct pr_registration {
40	__u64	old_key;
41	__u64	new_key;
42	__u32	flags;
43	__u32	__pad;
44};
45
46struct pr_preempt {
47	__u64	old_key;
48	__u64	new_key;
49	__u32	type;
50	__u32	flags;
51};
52
53struct pr_clear {
54	__u64	key;
55	__u32	flags;
56	__u32	__pad;
57};
58
59#define PR_FL_IGNORE_KEY	(1 << 0)	/* ignore existing key */
60
61#define IOC_PR_REGISTER		_IOW('p', 200, struct pr_registration)
62#define IOC_PR_RESERVE		_IOW('p', 201, struct pr_reservation)
63#define IOC_PR_RELEASE		_IOW('p', 202, struct pr_reservation)
64#define IOC_PR_PREEMPT		_IOW('p', 203, struct pr_preempt)
65#define IOC_PR_PREEMPT_ABORT	_IOW('p', 204, struct pr_preempt)
66#define IOC_PR_CLEAR		_IOW('p', 205, struct pr_clear)
67
68#endif /* _UAPI_PR_H */
69