1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2bbd3e064SChristoph Hellwig #ifndef LINUX_PR_H 3bbd3e064SChristoph Hellwig #define LINUX_PR_H 4bbd3e064SChristoph Hellwig 5bbd3e064SChristoph Hellwig #include <uapi/linux/pr.h> 6bbd3e064SChristoph Hellwig 7*c787f1baSMike Christie struct pr_keys { 8*c787f1baSMike Christie u32 generation; 9*c787f1baSMike Christie u32 num_keys; 10*c787f1baSMike Christie u64 keys[]; 11*c787f1baSMike Christie }; 12*c787f1baSMike Christie 13*c787f1baSMike Christie struct pr_held_reservation { 14*c787f1baSMike Christie u64 key; 15*c787f1baSMike Christie u32 generation; 16*c787f1baSMike Christie enum pr_type type; 17*c787f1baSMike Christie }; 18*c787f1baSMike Christie 19bbd3e064SChristoph Hellwig struct pr_ops { 20bbd3e064SChristoph Hellwig int (*pr_register)(struct block_device *bdev, u64 old_key, u64 new_key, 21bbd3e064SChristoph Hellwig u32 flags); 22bbd3e064SChristoph Hellwig int (*pr_reserve)(struct block_device *bdev, u64 key, 23bbd3e064SChristoph Hellwig enum pr_type type, u32 flags); 24bbd3e064SChristoph Hellwig int (*pr_release)(struct block_device *bdev, u64 key, 25bbd3e064SChristoph Hellwig enum pr_type type); 26bbd3e064SChristoph Hellwig int (*pr_preempt)(struct block_device *bdev, u64 old_key, u64 new_key, 27bbd3e064SChristoph Hellwig enum pr_type type, bool abort); 28bbd3e064SChristoph Hellwig int (*pr_clear)(struct block_device *bdev, u64 key); 29*c787f1baSMike Christie /* 30*c787f1baSMike Christie * pr_read_keys - Read the registered keys and return them in the 31*c787f1baSMike Christie * pr_keys->keys array. The keys array will have been allocated at the 32*c787f1baSMike Christie * end of the pr_keys struct, and pr_keys->num_keys must be set to the 33*c787f1baSMike Christie * number of keys the array can hold. If there are more than can fit 34*c787f1baSMike Christie * in the array, success will still be returned and pr_keys->num_keys 35*c787f1baSMike Christie * will reflect the total number of keys the device contains, so the 36*c787f1baSMike Christie * caller can retry with a larger array. 37*c787f1baSMike Christie */ 38*c787f1baSMike Christie int (*pr_read_keys)(struct block_device *bdev, 39*c787f1baSMike Christie struct pr_keys *keys_info); 40*c787f1baSMike Christie int (*pr_read_reservation)(struct block_device *bdev, 41*c787f1baSMike Christie struct pr_held_reservation *rsv); 42bbd3e064SChristoph Hellwig }; 43bbd3e064SChristoph Hellwig 44bbd3e064SChristoph Hellwig #endif /* LINUX_PR_H */ 45