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CREATE_USN_JOURNAL_DATA structure (winioctl.h)

  • Article

Contains information that describes an update sequence number (USN) change journal.

Syntax

typedef struct {
  DWORDLONG MaximumSize;
  DWORDLONG AllocationDelta;
} CREATE_USN_JOURNAL_DATA, *PCREATE_USN_JOURNAL_DATA;

Members

MaximumSize

The target maximum size that the NTFS file system allocates for the change journal, in bytes.

The change journal can grow larger than this value, but it is then truncated at the next NTFS file system checkpoint to less than this value.

AllocationDelta

The size of memory allocation that is added to the end and removed from the beginning of the change journal, in bytes.

The change journal can grow to more than the sum of the values of MaximumSize and AllocationDelta before being trimmed.

Remarks

For more information, see Creating, Modifying, and Deleting a Change Journal.

Requirements

Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Header winioctl.h (include Windows.h)

See also

FSCTL_CREATE_USN_JOURNAL