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 | |