/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_PR_H
#define _UAPI_PR_H

#include <linux/types.h>

enum pr_status {
        PR_STS_SUCCESS                  = 0x0,
        /*
         * The following error codes are based on SCSI, because the interface
         * was originally created for it and has existing users.
         */
        /* Generic device failure. */
        PR_STS_IOERR                    = 0x2,
        PR_STS_RESERVATION_CONFLICT     = 0x18,
        /* Temporary path failure that can be retried. */
        PR_STS_RETRY_PATH_FAILURE       = 0xe0000,
        /* The request was failed due to a fast failure timer. */
        PR_STS_PATH_FAST_FAILED         = 0xf0000,
        /* The path cannot be reached and has been marked as failed. */
        PR_STS_PATH_FAILED              = 0x10000,
};

enum pr_type {
        PR_WRITE_EXCLUSIVE              = 1,
        PR_EXCLUSIVE_ACCESS             = 2,
        PR_WRITE_EXCLUSIVE_REG_ONLY     = 3,
        PR_EXCLUSIVE_ACCESS_REG_ONLY    = 4,
        PR_WRITE_EXCLUSIVE_ALL_REGS     = 5,
        PR_EXCLUSIVE_ACCESS_ALL_REGS    = 6,
};

struct pr_reservation {
        __u64   key;
        __u32   type;
        __u32   flags;
};

struct pr_registration {
        __u64   old_key;
        __u64   new_key;
        __u32   flags;
        __u32   __pad;
};

struct pr_preempt {
        __u64   old_key;
        __u64   new_key;
        __u32   type;
        __u32   flags;
};

struct pr_clear {
        __u64   key;
        __u32   flags;
        __u32   __pad;
};

struct pr_read_keys {
        __u32   generation;
        __u32   num_keys;
        __u64   keys_ptr;
};

struct pr_read_reservation {
        __u64   key;
        __u32   generation;
        __u32   type;
};

#define PR_FL_IGNORE_KEY        (1 << 0)        /* ignore existing key */

#define IOC_PR_REGISTER         _IOW('p', 200, struct pr_registration)
#define IOC_PR_RESERVE          _IOW('p', 201, struct pr_reservation)
#define IOC_PR_RELEASE          _IOW('p', 202, struct pr_reservation)
#define IOC_PR_PREEMPT          _IOW('p', 203, struct pr_preempt)
#define IOC_PR_PREEMPT_ABORT    _IOW('p', 204, struct pr_preempt)
#define IOC_PR_CLEAR            _IOW('p', 205, struct pr_clear)
#define IOC_PR_READ_KEYS        _IOWR('p', 206, struct pr_read_keys)
#define IOC_PR_READ_RESERVATION _IOR('p', 207, struct pr_read_reservation)

#define PR_KEYS_MAX             (1u << 16)

#endif /* _UAPI_PR_H */