Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
The FsRtlIncrementCcFastMdlReadWait routine increments the cache manager's CcFastMdlReadWait performance counter member in a processor control block (PRCB) object.
Syntax
void FsRtlIncrementCcFastMdlReadWait();
Return value
None
Remarks
FsRtlIncrementCcFastMdlReadWait increments the cache manager's CcFastMdlReadWait performance counter in the per-processor control block for the processor on which FsRtlIncrementCcFastMdlReadWait is called. This counter records the number of fast I/O MDL read operations (FsRtlMdlRead) serviced by a file system driver.
File system drivers should call this function to update the CcFastMdlReadWait performance counter if the driver chooses to override the default fast I/O MDL read handler.
The counter is only used to record fast I/O MDL read operations for a nonzero length. FsRtlIncrementCcFastMdlReadWait should not be called for a zero-length fast I/O MDL read.
File system drivers should not increment the CcFastMdlReadWait performance counter if their fast I/O MDL read handler returns FALSE due to IoGetTopLevelIrp returning a non-NULL value. The counter should only be incremented if the file system driver actually attempts to satisfy a nonzero-length fast I/O MDL read.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista |
| Target Platform | Universal |
| Header | ntifs.h (include FltKernel.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= APC_LEVEL |