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c787f1baa5
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>
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_PR_H
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#define LINUX_PR_H
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#include <uapi/linux/pr.h>
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struct pr_keys {
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u32 generation;
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u32 num_keys;
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u64 keys[];
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};
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struct pr_held_reservation {
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u64 key;
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u32 generation;
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enum pr_type type;
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};
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struct pr_ops {
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int (*pr_register)(struct block_device *bdev, u64 old_key, u64 new_key,
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u32 flags);
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int (*pr_reserve)(struct block_device *bdev, u64 key,
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enum pr_type type, u32 flags);
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int (*pr_release)(struct block_device *bdev, u64 key,
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enum pr_type type);
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int (*pr_preempt)(struct block_device *bdev, u64 old_key, u64 new_key,
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enum pr_type type, bool abort);
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int (*pr_clear)(struct block_device *bdev, u64 key);
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/*
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* pr_read_keys - Read the registered keys and return them in the
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* pr_keys->keys array. The keys array will have been allocated at the
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* end of the pr_keys struct, and pr_keys->num_keys must be set to the
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* number of keys the array can hold. If there are more than can fit
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* in the array, success will still be returned and pr_keys->num_keys
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* will reflect the total number of keys the device contains, so the
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* caller can retry with a larger array.
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*/
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int (*pr_read_keys)(struct block_device *bdev,
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struct pr_keys *keys_info);
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int (*pr_read_reservation)(struct block_device *bdev,
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struct pr_held_reservation *rsv);
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};
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#endif /* LINUX_PR_H */
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