USN_TRACK_MODIFIED_RANGES structure (ntifs.h)
The USN_TRACK_MODIFIED_RANGES structure contains returned update sequence number (USN) from FSCTL_USN_TRACK_MODIFIED_RANGES control code.
Syntax
typedef struct {
ULONG Flags;
ULONG Unused;
ULONGLONG ChunkSize;
LONGLONG FileSizeThreshold;
} USN_TRACK_MODIFIED_RANGES, *PUSN_TRACK_MODIFIED_RANGES;
Members
Flags
Indicates enabling range tracking.
| Value | Description |
|---|---|
| FLAG_USN_TRACK_MODIFIED_RANGES_ENABLE 0x00000001 | This flag is mandatory with FSCTL_USN_TR**ACK_MODIFIED_RANGES and is used to enable range tracking on the volume. |
Unused
Reserved.
ChunkSize
Chunk size for tracking ranges. A single byte modification will be reflected as the whole chunk being modified.
FileSizeThreshold
File size threshold to start outputting USN_RECORD_V4 structure record(s) for modified file, i.e. if the modified file size is less than this threshold, then no USN_RECORD_V4 record will be output.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8.1 |
| Header | ntifs.h |