zFILEMAP_LOGICAL

Contains a map of the logical extents being used on the volume and shows how fragmented a file is.

Service:File System Services (64-Bit)

Defined In:zPublics.h

Syntax

typedef struct zLogicalExtentElement_s
 {
    QUAD   blockNumber;
    QUAD   numBlocks;
} zLogicalExtentElement_s;

Fields

blockNumber: Specifies the logical block number in the volume where this extent starts. If this field contains FILEMAP_SPARSEBLOCK, this is an extent that describes an unallocated or sparse section of the file.
numBlocks: Specifies the number of logically contiguous blocks in this extent.

Remarks

Each extent element identifies a different fragment of the file on the logical volume. All fragments, including sparse ones, are represented by an extent.