1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _PR_H
3#define _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
59struct pr_read_keys {
60 __u32 generation;
61 __u32 num_keys;
62 __u64 keys_ptr;
63};
64
65struct pr_read_reservation {
66 __u64 key;
67 __u32 generation;
68 __u32 type;
69};
70
71#define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */
72
73#define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration)
74#define IOC_PR_RESERVE _IOW('p', 201, struct pr_reservation)
75#define IOC_PR_RELEASE _IOW('p', 202, struct pr_reservation)
76#define IOC_PR_PREEMPT _IOW('p', 203, struct pr_preempt)
77#define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt)
78#define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear)
79#define IOC_PR_READ_KEYS _IOWR('p', 206, struct pr_read_keys)
80#define IOC_PR_READ_RESERVATION _IOR('p', 207, struct pr_read_reservation)
81
82#define PR_KEYS_MAX (1u << 16)
83
84#endif /* _PR_H */