REFS_SMR_VOLUME_GC_PARAMETERS structure (ntifs.h)

The REFS_SMR_VOLUME_GC_PARAMETERS structure is used as the input structure for FSCTL_SET_REFS_SMR_VOLUME_GC_PARAMETERS.

Syntax

typedef struct _REFS_SMR_VOLUME_GC_PARAMETERS {
  ULONG                     Version;
  ULONG                     Flags;
  REFS_SMR_VOLUME_GC_ACTION Action;
  REFS_SMR_VOLUME_GC_METHOD Method;
  ULONG                     IoGranularity;
  ULONG                     CompressionFormat;
  ULONGLONG                 Unused[8];
} REFS_SMR_VOLUME_GC_PARAMETERS, *PREFS_SMR_VOLUME_GC_PARAMETERS;

Members

Version

The current version of REFS_SMR_VOLUME_GC_PARAMETERS. This field should be set to REFS_SMR_VOLUME_GC_PARAMETERS_VERSION_V1.

Flags

Specifies the flags. Flags is currently ignored.

Action

Specifies the garbage collection action.

Method

Specifies the garbage collection method or strategy. Currently only MsSmrGcMethodCompaction is allowed.

IoGranularity

Specifies the volume's granularity. IoGranularity is a multiple of the cluster size up to the Shingled Magnetic Recording (SMR) band size (256 MB). Zero or non-multiple of cluster size will result in a STATUS_INVALID_PARAMETERS status.

CompressionFormat

Reserved for future use.

Unused[8]

Reserved for future use.

Requirements

Requirement	Value
Minimum supported client	Windows 10, version 1709
Header	ntifs.h (include Ntifs.h)

See also

FSCTL_SET_REFS_SMR_VOLUME_GC_PARAMETERS