VOID
CdAddInitialAllocation (
__in PIRP_CONTEXT IrpContext,
__inout PFCB Fcb,
__in ULONG StartingBlock,
__in LONGLONG DataLength
)
/*++
Routine Description:
This routine is called to set up the initial entry in an Mcb.
This routine handles the single initial entry for a directory file. We will
round the start block down to a sector boundary. Our caller has already
biased the DataLength with any adjustments. This is used for the case
where there is a single entry and we want to align the data on a sector
boundary.
Arguments:
Fcb - Fcb containing the Mcb to update.
StartingBlock - Starting logical block for this directory. This is
the start of the actual data. We will bias this by the sector
offset of the data.
DataLength - Length of the data.
Return Value:
None
--*/
{
PCD_MCB_ENTRY McbEntry;
PAGED_CODE();
UNREFERENCED_PARAMETER( IrpContext );
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_FCB( Fcb );
ASSERT_LOCKED_FCB( Fcb );
ASSERT( 0 == Fcb->Mcb.CurrentEntryCount);
ASSERT( CDFS_NTC_FCB_DATA != Fcb->NodeTypeCode);
//
// Update the new entry with the input data.
//
McbEntry = Fcb->Mcb.McbArray;
//
// Start with the location and length on disk.
//
McbEntry->DiskOffset = LlBytesFromBlocks( Fcb->Vcb, StartingBlock );
McbEntry->DiskOffset -= Fcb->StreamOffset;
McbEntry->ByteCount = DataLength;
//
// The file offset is the logical position within this file.
// We know this is correct regardless of whether we bias the
// file size or disk offset.
//
McbEntry->FileOffset = 0;
//
// If the file is not interleaved then the size of the data block
// and total block are the same as the byte count.
//
McbEntry->DataBlockByteCount =
McbEntry->TotalBlockByteCount = McbEntry->ByteCount;
//
// Update the number of entries in the Mcb. The Mcb is never sparse
// so whenever we add an entry it becomes the last entry in the Mcb.
//
Fcb->Mcb.CurrentEntryCount = 1;
return;
}
VOID
CdQueueClose (
_In_ PIRP_CONTEXT IrpContext,
_In_ PFCB Fcb,
_In_ ULONG UserReference,
_In_ BOOLEAN DelayedClose
)
/*++
Routine Description:
This routine is called to queue a request to either the async or delayed
close queue. For the delayed queue we need to allocate a smaller
structure to contain the information about the file object. We do
that so we don't put the larger IrpContext structures into this long
lived queue. If we can allocate this structure then we put this
on the async queue instead.
Arguments:
Fcb - Fcb for this file object.
UserReference - Number of user references for this file object. This is
zero for an internal stream.
DelayedClose - Indicates whether this should go on the async or delayed
close queue.
Return Value:
None
--*/
{
PIRP_CONTEXT_LITE IrpContextLite = NULL;
BOOLEAN StartWorker = FALSE;
PAGED_CODE();
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_FCB( Fcb );
//
// Start with the delayed queue request. We can move this to the async
// queue if there is an allocation failure.
//
if (DelayedClose) {
//
// Try to allocate non-paged pool for the IRP_CONTEXT_LITE.
//
IrpContextLite = CdCreateIrpContextLite( IrpContext );
}
//
// We want to clear the top level context in this thread if
// necessary. Call our cleanup routine to do the work.
//
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_MORE_PROCESSING );
CdCleanupIrpContext( IrpContext, TRUE );
//
// Synchronize with the CdData lock.
//
CdLockCdData();
//
// If we have an IrpContext then put the request on the delayed close queue.
//
if (IrpContextLite != NULL) {
//
// Initialize the IrpContextLite.
//
IrpContextLite->NodeTypeCode = CDFS_NTC_IRP_CONTEXT_LITE;
IrpContextLite->NodeByteSize = sizeof( IRP_CONTEXT_LITE );
IrpContextLite->Fcb = Fcb;
IrpContextLite->UserReference = UserReference;
IrpContextLite->RealDevice = IrpContext->RealDevice;
//
// Add this to the delayed close list and increment
// the count.
//
InsertTailList( &CdData.DelayedCloseQueue,
&IrpContextLite->DelayedCloseLinks );
CdData.DelayedCloseCount += 1;
//
// If we are above our threshold then start the delayed
// close operation.
//
if (CdData.DelayedCloseCount > CdData.MaxDelayedCloseCount) {
CdData.ReduceDelayedClose = TRUE;
if (!CdData.FspCloseActive) {
CdData.FspCloseActive = TRUE;
StartWorker = TRUE;
}
}
//
// Unlock the CdData.
//
CdUnlockCdData();
//
// Cleanup the IrpContext.
//
CdCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
//
// Otherwise drop into the async case below.
//
} else {
//
// Store the information about the file object into the IrpContext.
//
IrpContext->Irp = (PIRP) Fcb;
IrpContext->ExceptionStatus = (NTSTATUS) UserReference;
//
// Add this to the async close list and increment the count.
//
InsertTailList( &CdData.AsyncCloseQueue,
&IrpContext->WorkQueueItem.List );
CdData.AsyncCloseCount += 1;
//
// Remember to start the Fsp close thread if not currently started.
//
if (!CdData.FspCloseActive) {
CdData.FspCloseActive = TRUE;
StartWorker = TRUE;
}
//
// Unlock the CdData.
//
CdUnlockCdData();
}
//
// Start the FspClose thread if we need to.
//
if (StartWorker) {
IoQueueWorkItem( CdData.CloseItem, CdCloseWorker, CriticalWorkQueue, NULL );
}
//
// Return to our caller.
//
return;
}
VOID
CdAddAllocationFromDirent (
__in PIRP_CONTEXT IrpContext,
__inout PFCB Fcb,
__in ULONG McbEntryOffset,
__in LONGLONG StartingFileOffset,
__in PDIRENT Dirent
)
/*++
Routine Description:
This routine is called to add an entry into the Cd Mcb. We grow the Mcb
as necessary and update the new entry.
NOTE - The Fcb has already been locked prior to makeing this call.
Arguments:
Fcb - Fcb containing the Mcb to update.
McbEntryOffset - Offset into the Mcb array to add this data.
StartingFileOffset - Offset in bytes from the start of the file.
Dirent - Dirent containing the on-disk data for this entry.
Return Value:
None
--*/
{
ULONG NewArraySize;
PVOID NewMcbArray;
PCD_MCB_ENTRY McbEntry;
PAGED_CODE();
UNREFERENCED_PARAMETER( IrpContext );
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_FCB( Fcb );
ASSERT_LOCKED_FCB( Fcb );
//
// If we need to grow the Mcb then do it now.
//
if (McbEntryOffset >= Fcb->Mcb.MaximumEntryCount) {
//
// Allocate a new buffer and copy the old data over.
//
NewArraySize = Fcb->Mcb.MaximumEntryCount * 2 * sizeof( CD_MCB_ENTRY );
NewMcbArray = FsRtlAllocatePoolWithTag( CdPagedPool,
NewArraySize,
TAG_MCB_ARRAY );
RtlZeroMemory( NewMcbArray, NewArraySize );
RtlCopyMemory( NewMcbArray,
Fcb->Mcb.McbArray,
Fcb->Mcb.MaximumEntryCount * sizeof( CD_MCB_ENTRY ));
//
// Deallocate the current array unless it is embedded in the Fcb.
//
if (Fcb->Mcb.MaximumEntryCount != 1) {
CdFreePool( &Fcb->Mcb.McbArray );
}
//
// Now update the Mcb with the new array.
//
Fcb->Mcb.MaximumEntryCount *= 2;
Fcb->Mcb.McbArray = NewMcbArray;
}
//
// Update the new entry with the input data.
//
McbEntry = Fcb->Mcb.McbArray + McbEntryOffset;
//
// Start with the location and length on disk.
//
McbEntry->DiskOffset = LlBytesFromBlocks( Fcb->Vcb, Dirent->StartingOffset );
McbEntry->ByteCount = Dirent->DataLength;
//
// Round the byte count up to a logical block boundary if this is
// the last extent.
//
if (!FlagOn( Dirent->DirentFlags, CD_ATTRIBUTE_MULTI )) {
McbEntry->ByteCount = BlockAlign( Fcb->Vcb, McbEntry->ByteCount );
}
//
// The file offset is the logical position within this file.
// We know this is correct regardless of whether we bias the
// file size or disk offset.
//
McbEntry->FileOffset = StartingFileOffset;
//
// Convert the interleave information from logical blocks to
// bytes.
//
if (Dirent->FileUnitSize != 0) {
McbEntry->DataBlockByteCount = LlBytesFromBlocks( Fcb->Vcb, Dirent->FileUnitSize );
McbEntry->TotalBlockByteCount = McbEntry->DataBlockByteCount +
LlBytesFromBlocks( Fcb->Vcb, Dirent->InterleaveGapSize );
//
// If the file is not interleaved then the size of the data block
// and total block are the same as the byte count.
//
} else {
McbEntry->DataBlockByteCount =
McbEntry->TotalBlockByteCount = McbEntry->ByteCount;
}
//
// Update the number of entries in the Mcb. The Mcb is never sparse
// so whenever we add an entry it becomes the last entry in the Mcb.
//
Fcb->Mcb.CurrentEntryCount = McbEntryOffset + 1;
return;
}
BOOLEAN
CdCommonClosePrivate (
_In_ PIRP_CONTEXT IrpContext,
_In_ PVCB Vcb,
_In_ PFCB Fcb,
_In_ ULONG UserReference,
_In_ BOOLEAN FromFsd
)
/*++
Routine Description:
This is the worker routine for the close operation. We can be called in
an Fsd thread or from a worker Fsp thread. If called from the Fsd thread
then we acquire the resources without waiting. Otherwise we know it is
safe to wait.
We check to see whether we should post this request to the delayed close
queue. If we are to process the close here then we acquire the Vcb and
Fcb. We will adjust the counts and call our teardown routine to see
if any of the structures should go away.
Arguments:
Vcb - Vcb for this volume.
Fcb - Fcb for this request.
UserReference - Number of user references for this file object. This is
zero for an internal stream.
FromFsd - This request was called from an Fsd thread. Indicates whether
we should wait to acquire resources.
DelayedClose - Address to store whether we should try to put this on
the delayed close queue. Ignored if this routine can process this
close.
Return Value:
BOOLEAN - TRUE if this thread processed the close, FALSE otherwise.
--*/
{
BOOLEAN RemovedFcb;
PAGED_CODE();
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_FCB( Fcb );
//
// Try to acquire the Vcb and Fcb. If we can't acquire them then return
// and let our caller know he should post the request to the async
// queue.
//
if (CdAcquireVcbShared( IrpContext, Vcb, FromFsd )) {
if (!CdAcquireFcbExclusive( IrpContext, Fcb, FromFsd )) {
//
// We couldn't get the Fcb. Release the Vcb and let our caller
// know to post this request.
//
CdReleaseVcb( IrpContext, Vcb );
return FALSE;
}
//
// We didn't get the Vcb. Let our caller know to post this request.
//
} else {
return FALSE;
}
//
// Lock the Vcb and decrement the reference counts.
//
CdLockVcb( IrpContext, Vcb );
CdDecrementReferenceCounts( IrpContext, Fcb, 1, UserReference );
CdUnlockVcb( IrpContext, Vcb );
//
// Call our teardown routine to see if this object can go away.
// If we don't remove the Fcb then release it.
//
CdTeardownStructures( IrpContext, Fcb, &RemovedFcb );
if (!RemovedFcb) {
CdReleaseFcb( IrpContext, Fcb );
}
else {
_Analysis_assume_lock_not_held_(Fcb->FcbNonpaged->FcbResource);
}
//
// Release the Vcb and return to our caller. Let him know we completed
// this request.
//
CdReleaseVcb( IrpContext, Vcb );
return TRUE;
}
