1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef LINUX_PR_H
3#define LINUX_PR_H
4
5#include <uapi/linux/pr.h>
6
7struct pr_keys {
8	u32	generation;
9	u32	num_keys;
10	u64	keys[];
11};
12
13struct pr_held_reservation {
14	u64		key;
15	u32		generation;
16	enum pr_type	type;
17};
18
19struct pr_ops {
20	int (*pr_register)(struct block_device *bdev, u64 old_key, u64 new_key,
21			u32 flags);
22	int (*pr_reserve)(struct block_device *bdev, u64 key,
23			enum pr_type type, u32 flags);
24	int (*pr_release)(struct block_device *bdev, u64 key,
25			enum pr_type type);
26	int (*pr_preempt)(struct block_device *bdev, u64 old_key, u64 new_key,
27			enum pr_type type, bool abort);
28	int (*pr_clear)(struct block_device *bdev, u64 key);
29	/*
30	 * pr_read_keys - Read the registered keys and return them in the
31	 * pr_keys->keys array. The keys array will have been allocated at the
32	 * end of the pr_keys struct, and pr_keys->num_keys must be set to the
33	 * number of keys the array can hold. If there are more than can fit
34	 * in the array, success will still be returned and pr_keys->num_keys
35	 * will reflect the total number of keys the device contains, so the
36	 * caller can retry with a larger array.
37	 */
38	int (*pr_read_keys)(struct block_device *bdev,
39			struct pr_keys *keys_info);
40	int (*pr_read_reservation)(struct block_device *bdev,
41			struct pr_held_reservation *rsv);
42};
43
44#endif /* LINUX_PR_H */
45