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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_PR_H
#define LINUX_PR_H
#include <uapi/linux/pr.h>
struct pr_keys {
u32 generation;
u32 num_keys;
u64 keys[];
};
struct pr_held_reservation {
u64 key;
u32 generation;
enum pr_type type;
};
struct pr_ops {
int (*pr_register)(struct block_device *bdev, u64 old_key, u64 new_key,
u32 flags);
int (*pr_reserve)(struct block_device *bdev, u64 key,
enum pr_type type, u32 flags);
int (*pr_release)(struct block_device *bdev, u64 key,
enum pr_type type);
int (*pr_preempt)(struct block_device *bdev, u64 old_key, u64 new_key,
enum pr_type type, bool abort);
int (*pr_clear)(struct block_device *bdev, u64 key);
/*
* pr_read_keys - Read the registered keys and return them in the
* pr_keys->keys array. The keys array will have been allocated at the
* end of the pr_keys struct, and pr_keys->num_keys must be set to the
* number of keys the array can hold. If there are more than can fit
* in the array, success will still be returned and pr_keys->num_keys
* will reflect the total number of keys the device contains, so the
* caller can retry with a larger array.
*/
int (*pr_read_keys)(struct block_device *bdev,
struct pr_keys *keys_info);
int (*pr_read_reservation)(struct block_device *bdev,
struct pr_held_reservation *rsv);
};
#endif /* LINUX_PR_H */
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