FsRtlNumberOfRunsInLargeMcb function (ntifs.h)
The FsRtlNumberOfRunsInLargeMcb routine returns the number of runs in a map control block (MCB).
Syntax
ULONG FsRtlNumberOfRunsInLargeMcb(
PLARGE_MCB Mcb
);
Parameters
Mcb
Supplies the MCB being examined.
Return value
Returns the number of distinct runs mapped by the input MCB.
Remarks
FsRtlNumberOfRunsInLargeMcb returns the number of distinct runs mapped by an MCB.
Runs can be mappings or holes. A mapping is a continuous range of VBNs that is mapped to a corresponding range of logical block numbers (LBN). Mappings cannot overlap. A hole is a continuous range of unmapped VBNs that falls between two mappings. Within the entire range of mapped VBNs, every VBN belongs to exactly one mapping or hole.
Note 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 |