FsRtlIncrementCcFastReadNotPossible function (ntifs.h)

The FsRtlIncrementCcFastReadNotPossible routine increments the CcFastReadNotPossible performance counter in a per processor control block of cache manager system counters.

Syntax

void FsRtlIncrementCcFastReadNotPossible();

Return value

None

Remarks

FsRtlIncrementCcFastReadNotPossible increments the CcFastReadNotPossible performance counter in the per processor control block of cache manager system counters. This counter indicates that a fast I/O read operation (FsRtlCopyRead) was called, but fast I/O was not possible. This counter does not get incremented if fast I/O was not possible because the file resource could not be acquired for shared access. When the resource could not be acquired, the CcFastReadResourceMiss performance counter should be incremented.

File system drivers should call this function to update the performance counter if the driver chooses to override the default fast I/O read handler.

Requirements

Requirement	Value
Minimum supported client	Windows XP
Target Platform	Universal
Header	ntifs.h (include Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe
IRQL	Any level

See also

FsRtlCopyRead

FsRtlIncrementCcFastReadNoWait

FsRtlIncrementCcFastReadResourceMiss

FsRtlIncrementCcFastReadWait