diff options
Diffstat (limited to 'include/linux/pr.h')
| -rw-r--r-- | include/linux/pr.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/pr.h b/include/linux/pr.h index 65c01c10b335..3003daec28a5 100644 --- a/include/linux/pr.h +++ b/include/linux/pr.h @@ -1,8 +1,21 @@ +/* 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); @@ -13,6 +26,19 @@ struct pr_ops { 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 */ |