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/*
* COPYRIGHT: See COPYRIGHT.TXT
* PROJECT: Ext2 File System Driver for WinNT/2K/XP
* FILE: close.c
* PROGRAMMER: Matt Wu <mattwu@163.com>
* HOMEPAGE: http://www.ext2fsd.com
* UPDATE HISTORY:
*/
/* INCLUDES *****************************************************************/
#include "ext2fs.h"
/* GLOBALS ***************************************************************/
extern PEXT2_GLOBAL Ext2Global;
/* DEFINITIONS *************************************************************/
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, Ext2QueueCloseRequest)
#pragma alloc_text(PAGE, Ext2DeQueueCloseRequest)
#endif
NTSTATUS
Ext2Close (IN PEXT2_IRP_CONTEXT IrpContext)
{
PDEVICE_OBJECT DeviceObject;
NTSTATUS Status = STATUS_SUCCESS;
PEXT2_VCB Vcb = NULL;
PFILE_OBJECT FileObject;
PEXT2_FCB Fcb = NULL;
PEXT2_CCB Ccb = NULL;
BOOLEAN VcbResourceAcquired = FALSE;
BOOLEAN FcbResourceAcquired = FALSE;
BOOLEAN FcbDerefDeferred = FALSE;
__try {
ASSERT(IrpContext != NULL);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
if (IsExt2FsDevice(DeviceObject)) {
Status = STATUS_SUCCESS;
Vcb = NULL;
__leave;
}
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE)) {
FileObject = NULL;
Fcb = IrpContext->Fcb;
Ccb = IrpContext->Ccb;
} else {
FileObject = IrpContext->FileObject;
Fcb = (PEXT2_FCB) FileObject->FsContext;
if (!Fcb) {
Status = STATUS_SUCCESS;
__leave;
}
ASSERT(Fcb != NULL);
Ccb = (PEXT2_CCB) FileObject->FsContext2;
}
DEBUG(DL_INF, ( "Ext2Close: (VCB) Vcb = %p ReferCount = %d\n",
Vcb, Vcb->ReferenceCount));
/*
* WARNING: don't release Vcb resource lock here.
*
* CcPurgeCacheSection will lead a recursive irp: IRP_MJ_CLOSE
* which would cause revrese order of lock acquirision:
* 1) IRP_MJ_CLEANUP: a) Vcb lock -> b) Fcb lock
* 2) IRP_MJ_CLOSE: c) Vcb lock -> d) Fcb lock
*/
if (Fcb->Identifier.Type == EXT2VCB) {
if (!ExAcquireResourceExclusiveLite(
&Vcb->MainResource,
TRUE )) {
DEBUG(DL_INF, ("Ext2Close: PENDING ... Vcb: %xh/%xh\n",
Vcb->OpenHandleCount, Vcb->ReferenceCount));
Status = STATUS_PENDING;
__leave;
}
VcbResourceAcquired = TRUE;
if (Ccb) {
Ext2DerefXcb(&Vcb->ReferenceCount);
Ext2FreeCcb(Vcb, Ccb);
if (FileObject) {
FileObject->FsContext2 = Ccb = NULL;
}
}
Status = STATUS_SUCCESS;
__leave;
}
if ( Fcb->Identifier.Type != EXT2FCB ||
Fcb->Identifier.Size != sizeof(EXT2_FCB)) {
__leave;
}
if (!ExAcquireResourceExclusiveLite(
&Fcb->MainResource,
TRUE )) {
Status = STATUS_PENDING;
__leave;
}
FcbResourceAcquired = TRUE;
Fcb->Header.IsFastIoPossible = FastIoIsNotPossible;
if (Ccb == NULL ||
Ccb->Identifier.Type != EXT2CCB ||
Ccb->Identifier.Size != sizeof(EXT2_CCB)) {
Status = STATUS_SUCCESS;
__leave;
}
DEBUG(DL_INF, ( "Ext2Close: Fcb = %p OpenHandleCount= %u ReferenceCount=%u NonCachedCount=%u %wZ\n",
Fcb, Fcb->OpenHandleCount, Fcb->ReferenceCount, Fcb->NonCachedOpenCount, &Fcb->Mcb->FullName ));
Ext2FreeCcb(Vcb, Ccb);
if (FileObject) {
FileObject->FsContext2 = Ccb = NULL;
}
/* only deref fcb, Ext2ReleaseFcb might lead deadlock */
FcbDerefDeferred = TRUE;
if (IsFlagOn(Fcb->Flags, FCB_DELETE_PENDING) ||
NULL == Fcb->Mcb ||
IsFileDeleted(Fcb->Mcb)) {
Fcb->TsDrop.QuadPart = 0;
} else {
KeQuerySystemTime(&Fcb->TsDrop);
}
Ext2DerefXcb(&Vcb->ReferenceCount);
if (FileObject) {
FileObject->FsContext = NULL;
}
Status = STATUS_SUCCESS;
} __finally {
if (FcbResourceAcquired) {
ExReleaseResourceLite(&Fcb->MainResource);
}
if (VcbResourceAcquired) {
ExReleaseResourceLite(&Vcb->MainResource);
}
if (!IrpContext->ExceptionInProgress) {
if (Status == STATUS_PENDING) {
Ext2QueueCloseRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
}
if (FcbDerefDeferred)
Ext2DerefXcb(&Fcb->ReferenceCount);
}
return Status;
}
VOID
Ext2QueueCloseRequest (IN PEXT2_IRP_CONTEXT IrpContext)
{
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE)) {
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_FILE_BUSY)) {
Ext2Sleep(500); /* 0.5 sec*/
} else {
Ext2Sleep(50); /* 0.05 sec*/
}
} else {
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_DELAY_CLOSE);
IrpContext->Fcb = (PEXT2_FCB) IrpContext->FileObject->FsContext;
IrpContext->Ccb = (PEXT2_CCB) IrpContext->FileObject->FsContext2;
}
ExInitializeWorkItem(
&IrpContext->WorkQueueItem,
Ext2DeQueueCloseRequest,
IrpContext);
ExQueueWorkItem(&IrpContext->WorkQueueItem, DelayedWorkQueue);
}
VOID
Ext2DeQueueCloseRequest (IN PVOID Context)
{
PEXT2_IRP_CONTEXT IrpContext;
IrpContext = (PEXT2_IRP_CONTEXT) Context;
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
__try {
__try {
FsRtlEnterFileSystem();
Ext2Close(IrpContext);
} __except (Ext2ExceptionFilter(IrpContext, GetExceptionInformation())) {
Ext2ExceptionHandler(IrpContext);
}
} __finally {
FsRtlExitFileSystem();
}
}
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