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
7 struct pr_keys {
8 u32 generation;
9 u32 num_keys;
10 u64 keys[];
11 };
12
13 struct pr_held_reservation {
14 u64 key;
15 u32 generation;
16 enum pr_type type;
17 };
18
19 struct 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
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