FsRtlResetLargeMcb function (ntifs.h)
The FsRtlResetLargeMcb routine truncates a map control block (MCB) structure to contain zero mapping pairs. It does not shrink the mapping pairs array.
Syntax
void FsRtlResetLargeMcb(
[in] PLARGE_MCB Mcb,
[in] BOOLEAN SelfSynchronized
);
Parameters
[in] Mcb
Pointer to the MCB structure to truncate.
[in] SelfSynchronized
Indicates whether the caller is already synchronized with respect to the MCB.
Return value
None
Remarks
FsRtlResetLargeMcb truncates a map control block (MCB) structure. File systems use MCB structures to map virtual block numbers (VBN) for a file to the corresponding logical block numbers (LBN) on disk.
If the caller is already synchronized (the SelfSynchronized parameter is set to TRUE), such that no other thread of operation can call an Mcb routine on this MCB during this call, then FsRtlResetLargeMcb just clears out the current mapping pair count. If the SelfSynchronized parameter is set to FALSE, then FsRtlResetLargeMcb will serialize access to the Mcb before clearing the pair count which requires more time.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP |
| Target Platform | Universal |
| Header | ntifs.h (include Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= APC_LEVEL |