The FsRtlLookupLastLargeMcbEntryAndIndex routine retrieves the last mapping entry stored in a given map control block (MCB).
BOOLEAN FsRtlLookupLastLargeMcbEntryAndIndex( _In_ PLARGE_MCB OpaqueMcb, _Out_ PLONGLONG LargeVbn, _Out_ PLONGLONG LargeLbn, _Out_ PULONG Index );
- OpaqueMcb [in]
Pointer to an initialized MCB structure to be searched.
- LargeVbn [out]
Pointer to a variable that receives the last virtual block number (VBN) that was mapped.
- LargeLbn [out]
Pointer to a variable that receives the logical block number (LBN) that is mapped to the VBN pointed to by LargeVbn, or -1 if no such LBN exists.
- Index [out]
Pointer to a variable that receives the index of the last run in the MCB.
FsRtlLookupLastLargeMcbEntryAndIndex returns FALSE if the MCB contains no mapping entries, TRUE otherwise.
FsRtlLookupLastLargeMcbEntryAndIndex searches for the last mapping of the last run in the MCB:
If the MCB contains no mappings, FsRtlLookupLastLargeMcbEntryAndIndex returns FALSE.
If the last mapping is a hole, FsRtlLookupLastLargeMcbEntryAndIndex returns TRUE, but the lookup operation yields a value of -1 for the LBN.
If the last mapping is not a hole, the lookup operation yields a positive value for the LBN, and FsRtlLookupLastLargeMcbEntryAndIndex returns TRUE.
Note The upper 32 bits of the LBN are ignored. Only the lower 32 bits are used.
|This routine is available on Microsoft Windows XP and later.|