FsRtlLookupLastLargeMcbEntry function (ntifs.h)
The FsRtlLookupLastLargeMcbEntry routine retrieves the last mapping entry stored in the map control block (MCB).
Syntax
BOOLEAN FsRtlLookupLastLargeMcbEntry(
PLARGE_MCB Mcb,
PLONGLONG Vbn,
PLONGLONG Lbn
);
Parameters
Mcb
Pointer to an initialized MCB structure to be searched.
Vbn
Pointer to a variable that receives the last virtual block number (VBN) that was mapped.
Lbn
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.
Return value
FsRtlLookupLastLargeMcbEntry returns FALSE if the MCB contains no mapping entries, TRUE otherwise.
Remarks
FsRtlLookupLastLargeMcbEntry searches for the last mapping of the last run in the MCB:
If the MCB contains no mappings, FsRtlLookupLastLargeMcbEntry returns FALSE.
If the last mapping is a hole, FsRtlLookupLastLargeMcbEntry 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 FsRtlLookupLastLargeMcbEntry returns TRUE.
The upper 32 bits of the LBN are ignored. Only the lower 32 bits are used.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | ntifs.h (include Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= APC_LEVEL |