include/uapi/linux/pr.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _UAPI_PR_H
   3 #define _UAPI_PR_H
   4
   5 #include <linux/types.h>
   6
   7 enum pr_status {
   8         PR_STS_SUCCESS                  = 0x0,
   9         /*
  10          * The following error codes are based on SCSI, because the interface
  11          * was originally created for it and has existing users.
  12          */
  13         /* Generic device failure. */
  14         PR_STS_IOERR                    = 0x2,
  15         PR_STS_RESERVATION_CONFLICT     = 0x18,
  16         /* Temporary path failure that can be retried. */
  17         PR_STS_RETRY_PATH_FAILURE       = 0xe0000,
  18         /* The request was failed due to a fast failure timer. */
  19         PR_STS_PATH_FAST_FAILED         = 0xf0000,
  20         /* The path cannot be reached and has been marked as failed. */
  21         PR_STS_PATH_FAILED              = 0x10000,
  22 };
  23
  24 enum pr_type {
  25         PR_WRITE_EXCLUSIVE              = 1,
  26         PR_EXCLUSIVE_ACCESS             = 2,
  27         PR_WRITE_EXCLUSIVE_REG_ONLY     = 3,
  28         PR_EXCLUSIVE_ACCESS_REG_ONLY    = 4,
  29         PR_WRITE_EXCLUSIVE_ALL_REGS     = 5,
  30         PR_EXCLUSIVE_ACCESS_ALL_REGS    = 6,
  31 };
  32
  33 struct pr_reservation {
  34         __u64   key;
  35         __u32   type;
  36         __u32   flags;
  37 };
  38
  39 struct pr_registration {
  40         __u64   old_key;
  41         __u64   new_key;
  42         __u32   flags;
  43         __u32   __pad;
  44 };
  45
  46 struct pr_preempt {
  47         __u64   old_key;
  48         __u64   new_key;
  49         __u32   type;
  50         __u32   flags;
  51 };
  52
  53 struct pr_clear {
  54         __u64   key;
  55         __u32   flags;
  56         __u32   __pad;
  57 };
  58
  59 #define PR_FL_IGNORE_KEY        (1 << 0)        /* ignore existing key */
  60
  61 #define IOC_PR_REGISTER         _IOW('p', 200, struct pr_registration)
  62 #define IOC_PR_RESERVE          _IOW('p', 201, struct pr_reservation)
  63 #define IOC_PR_RELEASE          _IOW('p', 202, struct pr_reservation)
  64 #define IOC_PR_PREEMPT          _IOW('p', 203, struct pr_preempt)
  65 #define IOC_PR_PREEMPT_ABORT    _IOW('p', 204, struct pr_preempt)
  66 #define IOC_PR_CLEAR            _IOW('p', 205, struct pr_clear)
  67
  68 #endif /* _UAPI_PR_H */