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EWF_VOLUME_CONFIG

3/21/2011

This read-only structure contains configuration information about an Enhanced Write Filter (EWF)-protected volume.

Syntax

typedef struct _EWF_VOLUME_CONFIG
{
  EWF_TYPE Type;
  EWF_STATE State;
  EWF_COMMAND BootCommand;

  UCHAR PersistentData[EWF_MAX_PERSISTENT_DATA];
  USHORT MaxLevels;
  ULONG ClumpSize;
  USHORT CurrentLevel;

  union
  {
    struct
    {
      LONGLONG DiskMapSize;
      LONGLONG DiskDataSize;
    } DiskOverlay;

    struct
    {
      LONGLONG RamDataSize;
    } RamOverlay;
  };

  ULONG MemMapSize;
  EWF_VOLUME_DESC VolumeDesc;
  EWF_LEVEL_DESC LevelDescArray[1];
} EWF_VOLUME_CONFIG, * PEWF_VOLUME_CONFIG;

Members

  • Type
    Specifies the type of overlay for this volume: RAM, registry-described RAM, or disk.
  • State
    Specifies the state of the overlay for this volume. The state can be either enabled or disabled.
  • BootCommand
    Specifies a command to be executed on restart.
  • PersistentData
    Data that survives disable, enable, and restore operations. Persistent data size is EWF_MAX_PERSISTENT_DATA. By default this is 32 bytes.
  • MaxLevels
    Maximum number of checkpoint levels in the overlay.
  • ClumpSize
    Size of the clumps, in bytes. ClumpSize must be 512 bytes.
  • CurrentLevel
    Current checkpoint level.
  • DiskMapSize
    Size of the mapping data that is contained on disk for the protected volume, in bytes (only for disk overlays).
  • DiskDataSize
    Size of the data to be stored on disk for the protected volume, in bytes (only for disk overlays).
  • RamDataSize
    Size of the data to be stored in RAM for the protected volume, in bytes (only for RAM overlays).
  • MemMapSize
    Size of the mapping data that is contained in memory for the protected volume, in bytes.
  • VolumeDesc
    Volume device name and volume ID.
  • LevelDescArray
    Level description and end time, and level data size. Number of entries is specified by MaxLevels.

Requirements

OS Versions: Standard 7

Header: Ewfapi.h

Link Library: Ewfapi.lib

See Also

Reference

EwfMgrGetProtectedVolumeConfig

Concepts

EWF API Functions
EWF API Code Sample