// ntifs.h

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;
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Windows Driver Kit DDI reference (ns-ntifs-_refs_smr_volume_gc_parameters)

REFS_SMR_VOLUME_GC_PARAMETERS structure

Description

The REFS_SMR_VOLUME_GC_PARAMETERS structure is used as the input structure for FSCTL_SET_REFS_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`