Commit c787f1ba authored by Mike Christie's avatar Mike Christie Committed by Martin K. Petersen
Browse files

block: Add PR callouts for read keys and reservation 



Add callouts for reading keys and reservations. This allows LIO to support
the READ_KEYS and READ_RESERVATION commands so it can export devices to
VMs for software like windows clustering.

Signed-off-by: default avatarMike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230407200551.12660-2-michael.christie@oracle.com


Reviewed-by: default avatarChaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent fe15c26e

include/linux/pr.h

+25 −0
Original line number Diff line number Diff line
@@ -4,6 +4,18 @@ 


#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);
@@ -14,6 +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 */