bbd3e06436
This commits adds a driver API and ioctls for controlling Persistent Reservations s/genericly/generically/ at the block layer. Persistent Reservations are supported by SCSI and NVMe and allow controlling who gets access to a device in a shared storage setup. Note that we add a pr_ops structure to struct block_device_operations instead of adding the members directly to avoid bloating all instances of devices that will never support Persistent Reservations. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
49 lines
999 B
C
49 lines
999 B
C
#ifndef _UAPI_PR_H
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#define _UAPI_PR_H
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enum pr_type {
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PR_WRITE_EXCLUSIVE = 1,
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PR_EXCLUSIVE_ACCESS = 2,
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PR_WRITE_EXCLUSIVE_REG_ONLY = 3,
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PR_EXCLUSIVE_ACCESS_REG_ONLY = 4,
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PR_WRITE_EXCLUSIVE_ALL_REGS = 5,
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PR_EXCLUSIVE_ACCESS_ALL_REGS = 6,
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};
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struct pr_reservation {
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__u64 key;
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__u32 type;
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__u32 flags;
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};
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struct pr_registration {
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__u64 old_key;
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__u64 new_key;
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__u32 flags;
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__u32 __pad;
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};
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struct pr_preempt {
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__u64 old_key;
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__u64 new_key;
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__u32 type;
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__u32 flags;
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};
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struct pr_clear {
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__u64 key;
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__u32 flags;
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__u32 __pad;
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};
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#define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */
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#define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration)
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#define IOC_PR_RESERVE _IOW('p', 201, struct pr_reservation)
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#define IOC_PR_RELEASE _IOW('p', 202, struct pr_reservation)
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#define IOC_PR_PREEMPT _IOW('p', 203, struct pr_preempt)
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#define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt)
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#define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear)
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#endif /* _UAPI_PR_H */
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