#ifndef _NTIOAPI_H

// Input structure for IOCTL_MOUNTMGR_CHANGE_NOTIFY.
// Output structure for IOCTL_MOUNTMGR_CHANGE_NOTIFY.
typedef struct _MOUNTMGR_CHANGE_NOTIFY_INFO
{
    ULONG EpicNumber;
} MOUNTMGR_CHANGE_NOTIFY_INFO, *PMOUNTMGR_CHANGE_NOTIFY_INFO;

#endif
View code on GitHub

// mountmgr.h

typedef struct _MOUNTMGR_CHANGE_NOTIFY_INFO {
  ULONG EpicNumber;
} MOUNTMGR_CHANGE_NOTIFY_INFO, *PMOUNTMGR_CHANGE_NOTIFY_INFO;
View the official Windows Driver Kit DDI reference

NtDoc

This structure is documented in Windows Driver Kit.

Edit description on GitHub

Windows Driver Kit DDI reference (ns-mountmgr-_mountmgr_change_notify_info)

Description

The MOUNTMGR_CHANGE_NOTIFY_INFO structure is used by the mount manager to send epic numbers to its clients and vice versa.

Members

`EpicNumber`

Contains the value of a counter used by the mount manager to determine if a client has up-to-date information concerning changes in mount manager's persistent ID database.

Remarks

For more information, see Supporting Mount Manager Requests in a Storage Class Driver.