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block: Add PR callouts for read keys and reservation

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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: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230407200551.12660-2-michael.christie@oracle.com
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2023-04-07 15:05:34 -05:00 committed by Martin K. Petersen
parent fe15c26ee2
commit c787f1baa5
1 changed files with 25 additions and 0 deletions
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25
include/linux/pr.h
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@ -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 */