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implement acquire/release for ccflush #753

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implement acquire/release for ccflush #753

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28 changes: 26 additions & 2 deletions src/fastio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -323,19 +323,43 @@ static NTSTATUS __stdcall fast_io_release_for_mod_write(PFILE_OBJECT FileObject,

_Function_class_(FAST_IO_ACQUIRE_FOR_CCFLUSH)
static NTSTATUS __stdcall fast_io_acquire_for_ccflush(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject) {
UNUSED(FileObject);
fcb* fcb;

TRACE("(%p, %p)\n", FileObject, DeviceObject);

UNUSED(DeviceObject);

IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);

fcb = FileObject->FsContext;

if (!fcb)
return STATUS_INVALID_PARAMETER;

if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, true))
return STATUS_CANT_WAIT;

if (!ExAcquireResourceExclusiveLite(fcb->Header.Resource, true)) {
ExReleaseResourceLite(&fcb->Vcb->tree_lock);
return STATUS_CANT_WAIT;
}

return STATUS_SUCCESS;
}

_Function_class_(FAST_IO_RELEASE_FOR_CCFLUSH)
static NTSTATUS __stdcall fast_io_release_for_ccflush(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject) {
UNUSED(FileObject);
fcb* fcb;

TRACE("(%p, %p)\n", FileObject, DeviceObject);

UNUSED(DeviceObject);

fcb = FileObject->FsContext;

ExReleaseResourceLite(fcb->Header.Resource);
ExReleaseResourceLite(&fcb->Vcb->tree_lock);

if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
IoSetTopLevelIrp(NULL);

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