VOID
Ext2OplockComplete (
IN PVOID Context,
IN PIRP Irp
)
{
//
// Check on the return value in the Irp.
//
if (Irp->IoStatus.Status == STATUS_SUCCESS) {
//
// queue the Irp context in the workqueue.
//
Ext2QueueRequest((PEXT2_IRP_CONTEXT)Context);
} else {
//
// complete the request in case of failure
//
Ext2CompleteIrpContext( (PEXT2_IRP_CONTEXT) Context,
Irp->IoStatus.Status );
}
return;
}
VOID
Ext2DeferWrite(IN PEXT2_IRP_CONTEXT IrpContext, PIRP Irp)
{
ASSERT(IrpContext->Irp == Irp);
Ext2QueueRequest(IrpContext);
}
NTSTATUS
Ext2ReadVolume (IN PEXT2_IRP_CONTEXT IrpContext)
{
NTSTATUS Status = STATUS_UNSUCCESSFUL;
PEXT2_VCB Vcb = NULL;
PEXT2_CCB Ccb = NULL;
PEXT2_FCBVCB FcbOrVcb = NULL;
PFILE_OBJECT FileObject = NULL;
PDEVICE_OBJECT DeviceObject = NULL;
PIRP Irp = NULL;
PIO_STACK_LOCATION IoStackLocation = NULL;
ULONG Length;
LARGE_INTEGER ByteOffset;
BOOLEAN PagingIo;
BOOLEAN Nocache;
BOOLEAN SynchronousIo;
BOOLEAN MainResourceAcquired = FALSE;
PUCHAR Buffer = NULL;
EXT2_EXTENT BlockArray;
__try {
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
FileObject = IrpContext->FileObject;
FcbOrVcb = (PEXT2_FCBVCB) FileObject->FsContext;
ASSERT(FcbOrVcb);
if (!(FcbOrVcb->Identifier.Type == EXT2VCB && (PVOID)FcbOrVcb == (PVOID)Vcb)) {
Status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
Ccb = (PEXT2_CCB) FileObject->FsContext2;
Irp = IrpContext->Irp;
Irp->IoStatus.Information = 0;
IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
Length = IoStackLocation->Parameters.Read.Length;
ByteOffset = IoStackLocation->Parameters.Read.ByteOffset;
PagingIo = IsFlagOn(Irp->Flags, IRP_PAGING_IO);
Nocache = IsFlagOn(Irp->Flags, IRP_NOCACHE) || (Ccb != NULL);
SynchronousIo = IsFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO);
if (PagingIo) {
ASSERT(Nocache);
}
if (Length == 0) {
Irp->IoStatus.Information = 0;
Status = STATUS_SUCCESS;
__leave;
}
if (FlagOn(IrpContext->MinorFunction, IRP_MN_DPC)) {
ClearFlag(IrpContext->MinorFunction, IRP_MN_DPC);
Status = STATUS_PENDING;
__leave;
}
if (ByteOffset.QuadPart >=
Vcb->PartitionInformation.PartitionLength.QuadPart ) {
Irp->IoStatus.Information = 0;
Status = STATUS_END_OF_FILE;
__leave;
}
if (ByteOffset.QuadPart + Length > Vcb->Header.FileSize.QuadPart) {
Length = (ULONG)(Vcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
}
/*
* User direct volume access
*/
if (Ccb != NULL && !PagingIo) {
if (!ExAcquireResourceExclusiveLite(
&Vcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) )) {
Status = STATUS_PENDING;
__leave;
}
MainResourceAcquired = TRUE;
if (!FlagOn(Ccb->Flags, CCB_VOLUME_DASD_PURGE)) {
if (!FlagOn(Vcb->Flags, VCB_VOLUME_LOCKED)) {
Ext2FlushVolume(IrpContext, Vcb, FALSE);
}
SetFlag(Ccb->Flags, CCB_VOLUME_DASD_PURGE);
}
ExReleaseResourceLite(&Vcb->MainResource);
MainResourceAcquired = FALSE;
/* will do Nocache i/o */
}
/*
* I/O to volume StreamObject
*/
if (!Nocache) {
if (IsFlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
CcMdlRead(
Vcb->Volume,
&ByteOffset,
Length,
&Irp->MdlAddress,
&Irp->IoStatus );
Status = Irp->IoStatus.Status;
} else {
Buffer = Ext2GetUserBuffer(Irp);
if (Buffer == NULL) {
DbgBreak();
Status = STATUS_INVALID_USER_BUFFER;
__leave;
}
if (!CcCopyRead(
Vcb->Volume,
&ByteOffset,
Length,
Ext2CanIWait(),
Buffer,
&Irp->IoStatus )) {
Status = STATUS_PENDING;
__leave;
}
Status = Irp->IoStatus.Status;
}
} else {
Length &= ~((ULONG)SECTOR_SIZE - 1);
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoWriteAccess );
if (!NT_SUCCESS(Status)) {
__leave;
}
BlockArray.Irp = NULL;
BlockArray.Lba = ByteOffset.QuadPart;
BlockArray.Offset = 0;
BlockArray.Length = Length;
BlockArray.Next = NULL;
Status = Ext2ReadWriteBlocks(IrpContext,
Vcb,
&BlockArray,
Length );
Irp = IrpContext->Irp;
if (!Irp) {
__leave;
}
}
} __finally {
if (MainResourceAcquired) {
ExReleaseResourceLite(&Vcb->MainResource);
}
if (!IrpContext->ExceptionInProgress) {
if (Irp) {
if (Status == STATUS_PENDING &&
!IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_REQUEUED)) {
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoWriteAccess );
if (NT_SUCCESS(Status)) {
Status = Ext2QueueRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
} else {
if (NT_SUCCESS(Status)) {
if (!PagingIo) {
if (SynchronousIo) {
FileObject->CurrentByteOffset.QuadPart =
ByteOffset.QuadPart + Irp->IoStatus.Information;
}
FileObject->Flags |= FO_FILE_FAST_IO_READ;
}
}
Ext2CompleteIrpContext(IrpContext, Status);;
}
} else {
Ext2FreeIrpContext(IrpContext);
}
}
}
return Status;
}
NTSTATUS
Ext2ReadFile(IN PEXT2_IRP_CONTEXT IrpContext)
{
NTSTATUS Status = STATUS_UNSUCCESSFUL;
PEXT2_VCB Vcb = NULL;
PEXT2_FCB Fcb = NULL;
PEXT2_CCB Ccb = NULL;
PFILE_OBJECT FileObject = NULL;
PDEVICE_OBJECT DeviceObject = NULL;
PIRP Irp = NULL;
PIO_STACK_LOCATION IoStackLocation = NULL;
ULONG Length;
ULONG ReturnedLength = 0;
LARGE_INTEGER ByteOffset;
BOOLEAN OpPostIrp = FALSE;
BOOLEAN PagingIo;
BOOLEAN Nocache;
BOOLEAN SynchronousIo;
BOOLEAN MainResourceAcquired = FALSE;
BOOLEAN PagingIoResourceAcquired = FALSE;
PUCHAR Buffer;
__try {
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
FileObject = IrpContext->FileObject;
Fcb = (PEXT2_FCB) FileObject->FsContext;
ASSERT(Fcb);
ASSERT((Fcb->Identifier.Type == EXT2FCB) &&
(Fcb->Identifier.Size == sizeof(EXT2_FCB)));
Ccb = (PEXT2_CCB) FileObject->FsContext2;
Irp = IrpContext->Irp;
IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
Length = IoStackLocation->Parameters.Read.Length;
ByteOffset = IoStackLocation->Parameters.Read.ByteOffset;
PagingIo = IsFlagOn(Irp->Flags, IRP_PAGING_IO);
Nocache = IsFlagOn(Irp->Flags, IRP_NOCACHE);
SynchronousIo = IsFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO);
if (PagingIo) {
ASSERT(Nocache);
}
DEBUG(DL_INF, ("Ext2ReadFile: reading %wZ Off=%I64xh Len=%xh Paging=%xh Nocache=%xh\n",
&Fcb->Mcb->ShortName, ByteOffset.QuadPart, Length, PagingIo, Nocache));
if ((IsSymLink(Fcb) && IsFileDeleted(Fcb->Mcb->Target)) ||
IsFileDeleted(Fcb->Mcb)) {
Status = STATUS_FILE_DELETED;
__leave;
}
if (Length == 0) {
Irp->IoStatus.Information = 0;
Status = STATUS_SUCCESS;
__leave;
}
if (Nocache &&
(ByteOffset.LowPart & (SECTOR_SIZE - 1) ||
Length & (SECTOR_SIZE - 1))) {
Status = STATUS_INVALID_PARAMETER;
DbgBreak();
__leave;
}
if (FlagOn(IrpContext->MinorFunction, IRP_MN_DPC)) {
ClearFlag(IrpContext->MinorFunction, IRP_MN_DPC);
Status = STATUS_PENDING;
DbgBreak();
__leave;
}
if (!PagingIo && Nocache && (FileObject->SectionObjectPointer->DataSectionObject != NULL)) {
CcFlushCache( FileObject->SectionObjectPointer,
&ByteOffset,
Length,
&Irp->IoStatus );
if (!NT_SUCCESS(Irp->IoStatus.Status)) {
__leave;
}
}
ReturnedLength = Length;
if (PagingIo) {
if (!ExAcquireResourceSharedLite(
&Fcb->PagingIoResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) )) {
Status = STATUS_PENDING;
__leave;
}
PagingIoResourceAcquired = TRUE;
} else {
if (Nocache) {
if (!ExAcquireResourceExclusiveLite(
&Fcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) )) {
Status = STATUS_PENDING;
__leave;
}
MainResourceAcquired = TRUE;
} else {
if (!ExAcquireResourceSharedLite(
&Fcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) )) {
Status = STATUS_PENDING;
__leave;
}
MainResourceAcquired = TRUE;
}
if (!FsRtlCheckLockForReadAccess(
&Fcb->FileLockAnchor,
Irp )) {
Status = STATUS_FILE_LOCK_CONFLICT;
__leave;
}
}
if ((ByteOffset.QuadPart + (LONGLONG)Length) > Fcb->Header.FileSize.QuadPart) {
if (ByteOffset.QuadPart >= Fcb->Header.FileSize.QuadPart) {
Irp->IoStatus.Information = 0;
Status = STATUS_END_OF_FILE;
__leave;
}
ReturnedLength = (ULONG)(Fcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
}
if (!IsDirectory(Fcb) && Ccb != NULL) {
Status = FsRtlCheckOplock( &Fcb->Oplock,
Irp,
IrpContext,
Ext2OplockComplete,
Ext2LockIrp );
if (Status != STATUS_SUCCESS) {
OpPostIrp = TRUE;
__leave;
}
//
// Set the flag indicating if Fast I/O is possible
//
Fcb->Header.IsFastIoPossible = Ext2IsFastIoPossible(Fcb);
}
if (!Nocache) {
if (IsDirectory(Fcb)) {
__leave;
}
if (FileObject->PrivateCacheMap == NULL) {
CcInitializeCacheMap(
FileObject,
(PCC_FILE_SIZES)(&Fcb->Header.AllocationSize),
FALSE,
&Ext2Global->CacheManagerCallbacks,
Fcb );
CcSetReadAheadGranularity(
FileObject,
READ_AHEAD_GRANULARITY );
}
if (FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
CcMdlRead(
FileObject,
(&ByteOffset),
ReturnedLength,
&Irp->MdlAddress,
&Irp->IoStatus );
Status = Irp->IoStatus.Status;
} else {
Buffer = Ext2GetUserBuffer(Irp);
if (Buffer == NULL) {
Status = STATUS_INVALID_USER_BUFFER;
DbgBreak();
__leave;
}
if (!CcCopyRead(FileObject, &ByteOffset, ReturnedLength,
Ext2CanIWait(), Buffer, &Irp->IoStatus)) {
if (Ext2CanIWait() || !CcCopyRead(FileObject, &ByteOffset,
ReturnedLength, TRUE,
Buffer, &Irp->IoStatus)) {
Status = STATUS_PENDING;
DbgBreak();
__leave;
}
}
Status = Irp->IoStatus.Status;
}
} else {
ULONG BytesRead = ReturnedLength;
PUCHAR SystemVA = Ext2GetUserBuffer(IrpContext->Irp);
if (ByteOffset.QuadPart + BytesRead > Fcb->Header.ValidDataLength.QuadPart) {
if (ByteOffset.QuadPart >= Fcb->Header.ValidDataLength.QuadPart) {
if (SystemVA) {
SafeZeroMemory(SystemVA, Length);
}
Irp->IoStatus.Information = ReturnedLength;
Status = STATUS_SUCCESS;
__leave;
} else {
BytesRead = (ULONG)(Fcb->Header.ValidDataLength.QuadPart - ByteOffset.QuadPart);
if (SystemVA) {
SafeZeroMemory(SystemVA + BytesRead, Length - BytesRead);
}
}
}
Status = Ext2LockUserBuffer(
IrpContext->Irp,
BytesRead,
IoReadAccess );
if (!NT_SUCCESS(Status)) {
__leave;
}
Status = Ext2ReadInode(
IrpContext,
Vcb,
Fcb->Mcb,
ByteOffset.QuadPart,
NULL,
BytesRead,
TRUE,
NULL );
/* we need re-queue this request in case STATUS_CANT_WAIT
and fail it in other failure cases */
if (!NT_SUCCESS(Status)) {
__leave;
}
/* pended by low level device */
if (Status == STATUS_PENDING) {
IrpContext->Irp = Irp = NULL;
__leave;
}
Irp = IrpContext->Irp;
ASSERT(Irp);
Status = Irp->IoStatus.Status;
if (!NT_SUCCESS(Status)) {
Ext2NormalizeAndRaiseStatus(IrpContext, Status);
}
}
Irp->IoStatus.Information = ReturnedLength;
} __finally {
if (Irp) {
if (PagingIoResourceAcquired) {
ExReleaseResourceLite(&Fcb->PagingIoResource);
}
if (MainResourceAcquired) {
ExReleaseResourceLite(&Fcb->MainResource);
}
}
if (!OpPostIrp && !IrpContext->ExceptionInProgress) {
if (Irp) {
if ( Status == STATUS_PENDING ||
Status == STATUS_CANT_WAIT) {
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoWriteAccess );
if (NT_SUCCESS(Status)) {
Status = Ext2QueueRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
} else {
if (NT_SUCCESS(Status)) {
if (!PagingIo) {
if (SynchronousIo) {
FileObject->CurrentByteOffset.QuadPart =
ByteOffset.QuadPart + Irp->IoStatus.Information;
}
FileObject->Flags |= FO_FILE_FAST_IO_READ;
}
}
Ext2CompleteIrpContext(IrpContext, Status);
}
} else {
Ext2FreeIrpContext(IrpContext);
}
}
}
DEBUG(DL_IO, ("Ext2ReadFile: %wZ fetch at Off=%I64xh Len=%xh Paging=%xh Nocache=%xh Returned=%xh Status=%xh\n",
&Fcb->Mcb->ShortName, ByteOffset.QuadPart, Length, PagingIo, Nocache, ReturnedLength, Status));
return Status;
}
NTSTATUS
Ext2WriteFile(IN PEXT2_IRP_CONTEXT IrpContext)
{
PEXT2_VCB Vcb = NULL;
PEXT2_FCB Fcb = NULL;
PEXT2_CCB Ccb = NULL;
PFILE_OBJECT FileObject = NULL;
PDEVICE_OBJECT DeviceObject = NULL;
PIRP Irp = NULL;
PIO_STACK_LOCATION IoStackLocation = NULL;
PUCHAR Buffer = NULL;
LARGE_INTEGER ByteOffset;
ULONG ReturnedLength = 0;
ULONG Length;
NTSTATUS Status = STATUS_UNSUCCESSFUL;
BOOLEAN OpPostIrp = FALSE;
BOOLEAN PagingIo = FALSE;
BOOLEAN Nocache = FALSE;
BOOLEAN SynchronousIo = FALSE;
BOOLEAN RecursiveWriteThrough = FALSE;
BOOLEAN MainResourceAcquired = FALSE;
BOOLEAN PagingIoResourceAcquired = FALSE;
BOOLEAN bDeferred = FALSE;
BOOLEAN UpdateFileValidSize = FALSE;
BOOLEAN FileSizesChanged = FALSE;
BOOLEAN rc;
__try {
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
FileObject = IrpContext->FileObject;
Fcb = (PEXT2_FCB) FileObject->FsContext;
Ccb = (PEXT2_CCB) FileObject->FsContext2;
ASSERT(Fcb);
ASSERT((Fcb->Identifier.Type == EXT2FCB) &&
(Fcb->Identifier.Size == sizeof(EXT2_FCB)));
Irp = IrpContext->Irp;
IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
Length = IoStackLocation->Parameters.Write.Length;
ByteOffset = IoStackLocation->Parameters.Write.ByteOffset;
PagingIo = IsFlagOn(Irp->Flags, IRP_PAGING_IO);
Nocache = IsFlagOn(Irp->Flags, IRP_NOCACHE);
SynchronousIo = IsFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO);
if (PagingIo) {
ASSERT(Nocache);
}
DEBUG(DL_INF, ("Ext2WriteFile: %wZ Offset=%I64xh Length=%xh Paging=%xh Nocache=%xh\n",
&Fcb->Mcb->ShortName, ByteOffset.QuadPart, Length, PagingIo, Nocache));
if (IsSpecialFile(Fcb) || IsInodeSymLink(Fcb->Inode) ) {
Status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
if (IsFileDeleted(Fcb->Mcb) ||
(IsSymLink(Fcb) && IsFileDeleted(Fcb->Mcb->Target)) ) {
Status = STATUS_FILE_DELETED;
__leave;
}
if (Length == 0) {
Irp->IoStatus.Information = 0;
Status = STATUS_SUCCESS;
__leave;
}
if (ByteOffset.LowPart == FILE_USE_FILE_POINTER_POSITION &&
ByteOffset.HighPart == -1) {
ByteOffset = FileObject->CurrentByteOffset;
} else if (IsWritingToEof(ByteOffset)) {
ByteOffset.QuadPart = Fcb->Header.FileSize.QuadPart;
}
if (Nocache && !PagingIo &&
( (ByteOffset.LowPart & (SECTOR_SIZE - 1)) ||
(Length & (SECTOR_SIZE - 1))) ) {
Status = STATUS_INVALID_PARAMETER;
__leave;
}
if (FlagOn(IrpContext->MinorFunction, IRP_MN_DPC)) {
ClearFlag(IrpContext->MinorFunction, IRP_MN_DPC);
Status = STATUS_PENDING;
__leave;
}
if (!Nocache) {
BOOLEAN bAgain = IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DEFERRED);
BOOLEAN bWait = IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
BOOLEAN bQueue = IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_REQUEUED);
if ( !CcCanIWrite(
FileObject,
Length,
(bWait && bQueue),
bAgain ) ) {
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoReadAccess);
if (NT_SUCCESS(Status)) {
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_DEFERRED);
CcDeferWrite( FileObject,
(PCC_POST_DEFERRED_WRITE)Ext2DeferWrite,
IrpContext,
Irp,
Length,
bAgain );
bDeferred = TRUE;
Status = STATUS_PENDING;
__leave;
}
}
}
if (IsDirectory(Fcb) && !PagingIo) {
Status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
if (IsFlagOn(Irp->Flags, IRP_SYNCHRONOUS_PAGING_IO) && !IrpContext->IsTopLevel) {
PIRP TopIrp;
TopIrp = IoGetTopLevelIrp();
if ( (ULONG_PTR)TopIrp > FSRTL_MAX_TOP_LEVEL_IRP_FLAG &&
NodeType(TopIrp) == IO_TYPE_IRP) {
PIO_STACK_LOCATION IrpStack;
IrpStack = IoGetCurrentIrpStackLocation(TopIrp);
if ((IrpStack->MajorFunction == IRP_MJ_WRITE) &&
(IrpStack->FileObject->FsContext == FileObject->FsContext) &&
!FlagOn(TopIrp->Flags, IRP_NOCACHE) ) {
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
RecursiveWriteThrough = TRUE;
}
}
}
if (PagingIo) {
if (!ExAcquireResourceSharedLite(&Fcb->PagingIoResource, TRUE)) {
Status = STATUS_PENDING;
__leave;
}
PagingIoResourceAcquired = TRUE;
if ( (ByteOffset.QuadPart + Length) > Fcb->Header.FileSize.QuadPart) {
if (ByteOffset.QuadPart >= Fcb->Header.AllocationSize.QuadPart) {
Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
__leave;
} else {
ReturnedLength = (ULONG)(Fcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
if (ByteOffset.QuadPart + Length > Fcb->Header.AllocationSize.QuadPart)
Length = (ULONG)(Fcb->Header.AllocationSize.QuadPart - ByteOffset.QuadPart);
}
} else {
ReturnedLength = Length;
}
} else {
if (!Ext2CheckFileAccess(Vcb, Fcb->Mcb, Ext2FileCanWrite)) {
Status = STATUS_ACCESS_DENIED;
__leave;
}
if (IsDirectory(Fcb)) {
__leave;
}
if (!ExAcquireResourceExclusiveLite(&Fcb->MainResource, TRUE)) {
Status = STATUS_PENDING;
__leave;
}
MainResourceAcquired = TRUE;
//
// Do flushing for such cases
//
if (Nocache && Ccb != NULL && Fcb->SectionObject.DataSectionObject != NULL) {
ExAcquireSharedStarveExclusive( &Fcb->PagingIoResource, TRUE);
ExReleaseResourceLite(&Fcb->PagingIoResource);
CcFlushCache( &(Fcb->SectionObject),
&ByteOffset,
CEILING_ALIGNED(ULONG, Length, BLOCK_SIZE),
&(Irp->IoStatus));
ClearLongFlag(Fcb->Flags, FCB_FILE_MODIFIED);
if (!NT_SUCCESS(Irp->IoStatus.Status)) {
Status = Irp->IoStatus.Status;
__leave;
}
ExAcquireSharedStarveExclusive( &Fcb->PagingIoResource, TRUE);
ExReleaseResourceLite(&Fcb->PagingIoResource);
CcPurgeCacheSection( &(Fcb->SectionObject),
&(ByteOffset),
CEILING_ALIGNED(ULONG, Length, BLOCK_SIZE),
FALSE );
}
if (!FsRtlCheckLockForWriteAccess(&Fcb->FileLockAnchor, Irp)) {
Status = STATUS_FILE_LOCK_CONFLICT;
__leave;
}
if (Ccb != NULL) {
Status = FsRtlCheckOplock( &Fcb->Oplock,
Irp,
IrpContext,
Ext2OplockComplete,
Ext2LockIrp );
if (Status != STATUS_SUCCESS) {
OpPostIrp = TRUE;
__leave;
}
//
// Set the flag indicating if Fast I/O is possible
//
Fcb->Header.IsFastIoPossible = Ext2IsFastIoPossible(Fcb);
}
//
// Extend the inode size when the i/o is beyond the file end ?
//
if ((ByteOffset.QuadPart + Length) > Fcb->Header.FileSize.QuadPart) {
LARGE_INTEGER AllocationSize, Last;
if (!ExAcquireResourceExclusiveLite(&Fcb->PagingIoResource, TRUE)) {
Status = STATUS_PENDING;
__leave;
}
PagingIoResourceAcquired = TRUE;
/* let this irp wait, since it has to be synchronous */
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
Last.QuadPart = Fcb->Header.AllocationSize.QuadPart;
AllocationSize.QuadPart = (LONGLONG)(ByteOffset.QuadPart + Length);
AllocationSize.QuadPart = CEILING_ALIGNED(ULONGLONG,
(ULONGLONG)AllocationSize.QuadPart,
(ULONGLONG)BLOCK_SIZE);
/* tell Ext2ExpandFile to allocate unwritten extent or NULL blocks
for indirect files, otherwise we might get gabage data in holes */
IrpContext->MajorFunction += IRP_MJ_MAXIMUM_FUNCTION;
Status = Ext2ExpandFile(IrpContext, Vcb, Fcb->Mcb, &AllocationSize);
IrpContext->MajorFunction -= IRP_MJ_MAXIMUM_FUNCTION;
if (AllocationSize.QuadPart > Last.QuadPart) {
Fcb->Header.AllocationSize.QuadPart = AllocationSize.QuadPart;
SetLongFlag(Fcb->Flags, FCB_ALLOC_IN_WRITE);
}
ExReleaseResourceLite(&Fcb->PagingIoResource);
PagingIoResourceAcquired = FALSE;
if (ByteOffset.QuadPart >= Fcb->Header.AllocationSize.QuadPart) {
if (NT_SUCCESS(Status)) {
DbgBreak();
Status = STATUS_UNSUCCESSFUL;
}
__leave;
}
if (ByteOffset.QuadPart + Length > Fcb->Header.AllocationSize.QuadPart) {
Length = (ULONG)(Fcb->Header.AllocationSize.QuadPart - ByteOffset.QuadPart);
}
Fcb->Header.FileSize.QuadPart = Fcb->Inode->i_size = ByteOffset.QuadPart + Length;
Ext2SaveInode(IrpContext, Vcb, Fcb->Inode);
if (CcIsFileCached(FileObject)) {
CcSetFileSizes(FileObject, (PCC_FILE_SIZES)(&(Fcb->Header.AllocationSize)));
}
FileObject->Flags |= FO_FILE_SIZE_CHANGED | FO_FILE_MODIFIED;
FileSizesChanged = TRUE;
if (Fcb->Header.FileSize.QuadPart >= 0x80000000 &&
!IsFlagOn(SUPER_BLOCK->s_feature_ro_compat, EXT2_FEATURE_RO_COMPAT_LARGE_FILE)) {
SetFlag(SUPER_BLOCK->s_feature_ro_compat, EXT2_FEATURE_RO_COMPAT_LARGE_FILE);
Ext2SaveSuper(IrpContext, Vcb);
}
DEBUG(DL_IO, ("Ext2WriteFile: expanding %wZ to FS: %I64xh FA: %I64xh\n",
&Fcb->Mcb->ShortName, Fcb->Header.FileSize.QuadPart,
Fcb->Header.AllocationSize.QuadPart));
}
ReturnedLength = Length;
}
if (!Nocache) {
if (FileObject->PrivateCacheMap == NULL) {
CcInitializeCacheMap(
FileObject,
(PCC_FILE_SIZES)(&Fcb->Header.AllocationSize),
FALSE,
&Ext2Global->CacheManagerCallbacks,
Fcb );
CcSetReadAheadGranularity(
FileObject,
READ_AHEAD_GRANULARITY );
}
if (FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
CcPrepareMdlWrite(
FileObject,
&ByteOffset,
Length,
&Irp->MdlAddress,
&Irp->IoStatus );
Status = Irp->IoStatus.Status;
} else {
Buffer = Ext2GetUserBuffer(Irp);
if (Buffer == NULL) {
DbgBreak();
Status = STATUS_INVALID_USER_BUFFER;
__leave;
}
if (ByteOffset.QuadPart > Fcb->Header.ValidDataLength.QuadPart) {
/* let this irp wait, since it has to be synchronous */
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
rc = Ext2ZeroData(IrpContext, Vcb, FileObject,
&Fcb->Header.ValidDataLength, &ByteOffset);
if (!rc) {
Status = STATUS_PENDING;
DbgBreak();
__leave;
}
}
if (!CcCopyWrite(FileObject, &ByteOffset, Length, Ext2CanIWait(), Buffer)) {
if (Ext2CanIWait() ||
!CcCopyWrite(FileObject, &ByteOffset, Length, TRUE, Buffer)) {
Status = STATUS_PENDING;
DbgBreak();
__leave;
}
}
if (ByteOffset.QuadPart + Length > Fcb->Header.ValidDataLength.QuadPart ) {
if (Fcb->Header.FileSize.QuadPart < ByteOffset.QuadPart + Length) {
Fcb->Header.ValidDataLength.QuadPart = Fcb->Header.FileSize.QuadPart;
} else {
if (Fcb->Header.ValidDataLength.QuadPart < ByteOffset.QuadPart + Length)
Fcb->Header.ValidDataLength.QuadPart = ByteOffset.QuadPart + Length;
}
CcSetFileSizes(FileObject, (PCC_FILE_SIZES)(&(Fcb->Header.AllocationSize)));
FileSizesChanged = TRUE;
}
Status = STATUS_SUCCESS;
}
if (NT_SUCCESS(Status)) {
Irp->IoStatus.Information = Length;
if (IsFlagOn(Vcb->Flags, VCB_FLOPPY_DISK)) {
DEBUG(DL_FLP, ("Ext2WriteFile is starting FlushingDpc...\n"));
Ext2StartFloppyFlushDpc(Vcb, Fcb, FileObject);
}
}
} else {
if (!PagingIo && !RecursiveWriteThrough && !IsLazyWriter(Fcb)) {
if (ByteOffset.QuadPart > Fcb->Header.ValidDataLength.QuadPart) {
/* let this irp wait, since it has to be synchronous */
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
rc = Ext2ZeroData(IrpContext, Vcb, FileObject,
&Fcb->Header.ValidDataLength,
&ByteOffset);
if (!rc) {
Status = STATUS_PENDING;
DbgBreak();
__leave;
}
}
}
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoReadAccess );
if (!NT_SUCCESS(Status)) {
__leave;
}
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = ReturnedLength;
Status = Ext2WriteInode(
IrpContext,
Vcb,
Fcb->Mcb,
(ULONGLONG)(ByteOffset.QuadPart),
NULL,
ReturnedLength,
TRUE,
&Length
);
Irp = IrpContext->Irp;
if (NT_SUCCESS(Status) && !RecursiveWriteThrough && !IsLazyWriter(Fcb)) {
if (ByteOffset.QuadPart + Length > Fcb->Header.ValidDataLength.QuadPart ) {
FileSizesChanged = TRUE;
if (Fcb->Header.FileSize.QuadPart < ByteOffset.QuadPart + Length) {
if (!PagingIo)
Fcb->Header.FileSize.QuadPart = ByteOffset.QuadPart + Length;
Fcb->Header.ValidDataLength.QuadPart = Fcb->Header.FileSize.QuadPart;
} else {
if (Fcb->Header.ValidDataLength.QuadPart < ByteOffset.QuadPart + Length)
Fcb->Header.ValidDataLength.QuadPart = ByteOffset.QuadPart + Length;
}
if (!PagingIo && CcIsFileCached(FileObject)) {
CcSetFileSizes(FileObject, (PCC_FILE_SIZES)(&(Fcb->Header.AllocationSize)));
}
DEBUG(DL_IO, ("Ext2WriteFile: %wZ written FS: %I64xh FA: %I64xh BO: %I64xh LEN: %u\n",
&Fcb->Mcb->ShortName, Fcb->Header.FileSize.QuadPart,
Fcb->Header.AllocationSize.QuadPart, ByteOffset.QuadPart, Length));
}
}
}
if (FileSizesChanged) {
FileObject->Flags |= FO_FILE_SIZE_CHANGED | FO_FILE_MODIFIED;
Ext2NotifyReportChange( IrpContext, Vcb, Fcb->Mcb,
FILE_NOTIFY_CHANGE_SIZE,
FILE_ACTION_MODIFIED );
}
} __finally {
/*
* in case we got excpetions, we need revert MajorFunction
* back to IRP_MJ_WRITE. The reason we do this, is to tell
* Ext2ExpandFile to allocate unwritten extent or don't add
* new blocks for indirect files.
*/
if (IrpContext->MajorFunction > IRP_MJ_MAXIMUM_FUNCTION)
IrpContext->MajorFunction -= IRP_MJ_MAXIMUM_FUNCTION;
if (Irp) {
if (PagingIoResourceAcquired) {
ExReleaseResourceLite(&Fcb->PagingIoResource);
}
if (MainResourceAcquired) {
ExReleaseResourceLite(&Fcb->MainResource);
}
}
if (!OpPostIrp && !IrpContext->ExceptionInProgress) {
if (Irp) {
if (Status == STATUS_PENDING ||
Status == STATUS_CANT_WAIT ) {
if (!bDeferred) {
Status = Ext2QueueRequest(IrpContext);
}
} else {
if (NT_SUCCESS(Status) && !PagingIo) {
if (SynchronousIo) {
FileObject->CurrentByteOffset.QuadPart =
ByteOffset.QuadPart + Irp->IoStatus.Information;
}
SetFlag(FileObject->Flags, FO_FILE_MODIFIED);
SetLongFlag(Fcb->Flags, FCB_FILE_MODIFIED);
}
Ext2CompleteIrpContext(IrpContext, Status);
}
} else {
Ext2FreeIrpContext(IrpContext);
}
}
}
DEBUG(DL_IO, ("Ext2WriteFile: %wZ written at Offset=%I64xh Length=%xh PagingIo=%d Nocache=%d "
"RetLen=%xh VDL=%I64xh FileSize=%I64xh i_size=%I64xh Status=%xh\n",
&Fcb->Mcb->ShortName, ByteOffset, Length, PagingIo, Nocache, ReturnedLength,
Fcb->Header.ValidDataLength.QuadPart,Fcb->Header.FileSize.QuadPart,
Fcb->Inode->i_size, Status));
return Status;
}
NTSTATUS
Ext2WriteVolume (IN PEXT2_IRP_CONTEXT IrpContext)
{
NTSTATUS Status = STATUS_UNSUCCESSFUL;
PEXT2_VCB Vcb = NULL;
PEXT2_CCB Ccb = NULL;
PEXT2_FCBVCB FcbOrVcb = NULL;
PFILE_OBJECT FileObject = NULL;
PDEVICE_OBJECT DeviceObject = NULL;
PIRP Irp = NULL;
PIO_STACK_LOCATION IoStackLocation = NULL;
ULONG Length;
LARGE_INTEGER ByteOffset;
BOOLEAN PagingIo = FALSE;
BOOLEAN Nocache = FALSE;
BOOLEAN SynchronousIo = FALSE;
BOOLEAN MainResourceAcquired = FALSE;
BOOLEAN bDeferred = FALSE;
PUCHAR Buffer = NULL;
PEXT2_EXTENT Chain = NULL;
EXT2_EXTENT BlockArray;
__try {
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
FileObject = IrpContext->FileObject;
FcbOrVcb = (PEXT2_FCBVCB) FileObject->FsContext;
ASSERT(FcbOrVcb);
if (!(FcbOrVcb->Identifier.Type == EXT2VCB && (PVOID)FcbOrVcb == (PVOID)Vcb)) {
Status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
Ccb = (PEXT2_CCB) FileObject->FsContext2;
Irp = IrpContext->Irp;
IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
Length = IoStackLocation->Parameters.Write.Length;
ByteOffset = IoStackLocation->Parameters.Write.ByteOffset;
PagingIo = IsFlagOn(Irp->Flags, IRP_PAGING_IO);
Nocache = IsFlagOn(Irp->Flags, IRP_NOCACHE) || (Ccb != NULL);
SynchronousIo = IsFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO);
if (PagingIo) {
ASSERT(Nocache);
}
DEBUG(DL_INF, ("Ext2WriteVolume: Off=%I64xh Len=%xh Paging=%xh Nocache=%xh\n",
ByteOffset.QuadPart, Length, PagingIo, Nocache));
if (Length == 0) {
Irp->IoStatus.Information = 0;
Status = STATUS_SUCCESS;
__leave;
}
if (Nocache &&
(ByteOffset.LowPart & (SECTOR_SIZE - 1) ||
Length & (SECTOR_SIZE - 1))) {
Status = STATUS_INVALID_PARAMETER;
__leave;
}
if (FlagOn(IrpContext->MinorFunction, IRP_MN_DPC)) {
ClearFlag(IrpContext->MinorFunction, IRP_MN_DPC);
Status = STATUS_PENDING;
__leave;
}
if (ByteOffset.QuadPart >=
Vcb->PartitionInformation.PartitionLength.QuadPart ) {
Irp->IoStatus.Information = 0;
Status = STATUS_END_OF_FILE;
__leave;
}
if (!Nocache) {
BOOLEAN bAgain = IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_DEFERRED);
BOOLEAN bWait = IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
BOOLEAN bQueue = IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_REQUEUED);
if ( !CcCanIWrite(
FileObject,
Length,
(bWait && bQueue),
bAgain ) ) {
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoReadAccess);
if (NT_SUCCESS(Status)) {
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_DEFERRED);
CcDeferWrite( FileObject,
(PCC_POST_DEFERRED_WRITE)Ext2DeferWrite,
IrpContext,
Irp,
Length,
bAgain );
bDeferred = TRUE;
Status = STATUS_PENDING;
__leave;
}
}
}
/*
* User direct volume access
*/
if (Ccb != NULL && !PagingIo) {
if (!FlagOn(Ccb->Flags, CCB_VOLUME_DASD_PURGE)) {
if (!FlagOn(Vcb->Flags, VCB_VOLUME_LOCKED)) {
Status = Ext2PurgeVolume( Vcb, TRUE);
}
SetFlag(Ccb->Flags, CCB_VOLUME_DASD_PURGE);
}
if (!IsFlagOn(Ccb->Flags, CCB_ALLOW_EXTENDED_DASD_IO)) {
if (ByteOffset.QuadPart + Length > Vcb->Header.FileSize.QuadPart) {
Length = (ULONG)(Vcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
}
}
} else if (Nocache && !PagingIo && (Vcb->SectionObject.DataSectionObject != NULL)) {
ExAcquireResourceExclusiveLite(&Vcb->MainResource, TRUE);
MainResourceAcquired = TRUE;
ExAcquireSharedStarveExclusive(&Vcb->PagingIoResource, TRUE);
ExReleaseResourceLite(&Vcb->PagingIoResource);
CcFlushCache( &(Vcb->SectionObject),
&ByteOffset,
Length,
&(Irp->IoStatus));
if (!NT_SUCCESS(Irp->IoStatus.Status)) {
Status = Irp->IoStatus.Status;
__leave;
}
ExAcquireSharedStarveExclusive(&Vcb->PagingIoResource, TRUE);
ExReleaseResourceLite(&Vcb->PagingIoResource);
CcPurgeCacheSection( &(Vcb->SectionObject),
(PLARGE_INTEGER)&(ByteOffset),
Length,
FALSE );
ExReleaseResourceLite(&Vcb->MainResource);
MainResourceAcquired = FALSE;
}
if ( (ByteOffset.QuadPart + Length) > Vcb->Header.FileSize.QuadPart) {
Length = (ULONG)(Vcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
}
if (!Nocache) {
if (FlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {
CcPrepareMdlWrite (
Vcb->Volume,
&ByteOffset,
Length,
&Irp->MdlAddress,
&Irp->IoStatus );
Status = Irp->IoStatus.Status;
} else {
Buffer = Ext2GetUserBuffer(Irp);
if (Buffer == NULL) {
DbgBreak();
Status = STATUS_INVALID_USER_BUFFER;
__leave;
}
if (!CcCopyWrite( Vcb->Volume,
(PLARGE_INTEGER)(&ByteOffset),
Length,
TRUE,
Buffer )) {
Status = STATUS_PENDING;
__leave;
}
Status = Irp->IoStatus.Status;
Ext2AddVcbExtent(Vcb, ByteOffset.QuadPart, (LONGLONG)Length);
}
if (NT_SUCCESS(Status)) {
Irp->IoStatus.Information = Length;
}
} else if (PagingIo) {
LONGLONG DirtyStart;
LONGLONG DirtyLba;
LONGLONG DirtyLength;
LONGLONG RemainLength;
PEXT2_EXTENT Extent = NULL;
PEXT2_EXTENT List = NULL;
Length &= ~((ULONG)SECTOR_SIZE - 1);
Status = Ext2LockUserBuffer(IrpContext->Irp, Length, IoReadAccess);
if (!NT_SUCCESS(Status)) {
__leave;
}
DirtyLba = ByteOffset.QuadPart;
RemainLength = (LONGLONG) Length;
ASSERT(Length >= SECTOR_SIZE);
while (RemainLength > 0) {
DirtyStart = DirtyLba;
ASSERT(DirtyStart >= ByteOffset.QuadPart);
ASSERT(DirtyStart <= ByteOffset.QuadPart + Length);
if (Ext2LookupVcbExtent(Vcb, DirtyStart, &DirtyLba, &DirtyLength)) {
if (DirtyLba == -1) {
DirtyLba = DirtyStart + DirtyLength;
if (ByteOffset.QuadPart + Length > DirtyLba) {
RemainLength = ByteOffset.QuadPart + Length - DirtyLba;
ASSERT(DirtyStart >= ByteOffset.QuadPart);
ASSERT(DirtyStart <= ByteOffset.QuadPart + Length);
} else {
RemainLength = 0;
}
continue;
}
ASSERT(DirtyLba <= DirtyStart);
Extent = Ext2AllocateExtent();
if (!Extent) {
DEBUG(DL_ERR, ( "Ex2WriteVolume: failed to allocate Extent\n"));
Status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
Extent->Irp = NULL;
Extent->Lba = DirtyLba;
Extent->Offset = (ULONG)( DirtyStart + Length -
RemainLength - DirtyLba );
ASSERT(Extent->Offset <= Length);
if (DirtyLba + DirtyLength >= DirtyStart + RemainLength) {
Extent->Length = (ULONG)( DirtyLba +
RemainLength -
DirtyStart );
ASSERT(Extent->Length <= Length);
RemainLength = 0;
} else {
Extent->Length = (ULONG)(DirtyLength + DirtyLba - DirtyStart);
RemainLength = (DirtyStart + RemainLength) -
(DirtyLba + DirtyLength);
ASSERT(RemainLength <= (LONGLONG)Length);
ASSERT(Extent->Length <= Length);
}
ASSERT(Extent->Length >= SECTOR_SIZE);
DirtyLba = DirtyStart + DirtyLength;
if (List) {
List->Next = Extent;
List = Extent;
} else {
Chain = List = Extent;
}
} else {
if (RemainLength > SECTOR_SIZE) {
DirtyLba = DirtyStart + SECTOR_SIZE;
RemainLength -= SECTOR_SIZE;
} else {
RemainLength = 0;
}
}
}
if (Chain) {
Status = Ext2ReadWriteBlocks(IrpContext,
Vcb,
Chain,
Length );
Irp = IrpContext->Irp;
if (NT_SUCCESS(Status)) {
for (Extent = Chain; Extent != NULL; Extent = Extent->Next) {
Ext2RemoveVcbExtent(Vcb, Extent->Lba, Extent->Length);
}
}
if (!Irp) {
__leave;
}
} else {
Irp->IoStatus.Information = Length;
Status = STATUS_SUCCESS;
__leave;
}
} else {
Length &= ~((ULONG)SECTOR_SIZE - 1);
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoWriteAccess );
if (!NT_SUCCESS(Status)) {
__leave;
}
BlockArray.Irp = NULL;
BlockArray.Lba = ByteOffset.QuadPart;
BlockArray.Offset = 0;
BlockArray.Length = Length;
BlockArray.Next = NULL;
Status = Ext2ReadWriteBlocks(IrpContext,
Vcb,
&BlockArray,
Length );
if (NT_SUCCESS(Status)) {
Irp->IoStatus.Information = Length;
}
Irp = IrpContext->Irp;
if (!Irp) {
__leave;
}
}
} __finally {
if (MainResourceAcquired) {
ExReleaseResourceLite(&Vcb->MainResource);
}
if (!IrpContext->ExceptionInProgress) {
if (Irp) {
if (Status == STATUS_PENDING) {
if (!bDeferred) {
Status = Ext2LockUserBuffer(
IrpContext->Irp,
Length,
IoReadAccess );
if (NT_SUCCESS(Status)) {
Status = Ext2QueueRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
}
} else {
if (NT_SUCCESS(Status)) {
if (SynchronousIo && !PagingIo) {
FileObject->CurrentByteOffset.QuadPart =
ByteOffset.QuadPart + Irp->IoStatus.Information;
}
if (!PagingIo) {
SetFlag(FileObject->Flags, FO_FILE_MODIFIED);
}
}
Ext2CompleteIrpContext(IrpContext, Status);
}
} else {
Ext2FreeIrpContext(IrpContext);
}
}
if (Chain) {
Ext2DestroyExtentChain(Chain);
}
}
return Status;
}
NTSTATUS
Ext2ShutDown (IN PEXT2_IRP_CONTEXT IrpContext)
{
NTSTATUS Status;
PIRP Irp;
PIO_STACK_LOCATION IrpSp;
PEXT2_VCB Vcb;
PLIST_ENTRY ListEntry;
BOOLEAN GlobalResourceAcquired = FALSE;
__try {
Status = STATUS_SUCCESS;
ASSERT(IrpContext);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
Irp = IrpContext->Irp;
IrpSp = IoGetCurrentIrpStackLocation(Irp);
if (!ExAcquireResourceExclusiveLite(
&Ext2Global->Resource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) )) {
Status = STATUS_PENDING;
__leave;
}
GlobalResourceAcquired = TRUE;
for (ListEntry = Ext2Global->VcbList.Flink;
ListEntry != &(Ext2Global->VcbList);
ListEntry = ListEntry->Flink ) {
Vcb = CONTAINING_RECORD(ListEntry, EXT2_VCB, Next);
if (ExAcquireResourceExclusiveLite(
&Vcb->MainResource,
TRUE )) {
if (IsMounted(Vcb)) {
/* update mount count */
Vcb->SuperBlock->s_mnt_count++;
if (Vcb->SuperBlock->s_mnt_count >
Vcb->SuperBlock->s_max_mnt_count ) {
Vcb->SuperBlock->s_mnt_count =
Vcb->SuperBlock->s_max_mnt_count;
}
Ext2SaveSuper(IrpContext, Vcb);
/* flush dirty cache for all files */
Status = Ext2FlushFiles(IrpContext, Vcb, TRUE);
if (!NT_SUCCESS(Status)) {
DbgBreak();
}
/* flush volume stream's cache to disk */
Status = Ext2FlushVolume(IrpContext, Vcb, TRUE);
if (!NT_SUCCESS(Status) && Status != STATUS_MEDIA_WRITE_PROTECTED) {
DbgBreak();
}
/* send shutdown request to underlying disk */
Ext2DiskShutDown(Vcb);
}
ExReleaseResourceLite(&Vcb->MainResource);
}
}
/*
IoUnregisterFileSystem(Ext2Global->DiskdevObject);
IoUnregisterFileSystem(Ext2Global->CdromdevObject);
*/
} __finally {
if (GlobalResourceAcquired) {
ExReleaseResourceLite(&Ext2Global->Resource);
}
if (!IrpContext->ExceptionInProgress) {
if (Status == STATUS_PENDING) {
Ext2QueueRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
}
}
return Status;
}
NTSTATUS
Ext2Cleanup (IN PEXT2_IRP_CONTEXT IrpContext)
{
PDEVICE_OBJECT DeviceObject;
NTSTATUS Status = STATUS_SUCCESS;
PEXT2_VCB Vcb;
PFILE_OBJECT FileObject;
PEXT2_FCB Fcb;
PEXT2_CCB Ccb;
PIRP Irp;
PEXT2_MCB Mcb;
BOOLEAN VcbResourceAcquired = FALSE;
BOOLEAN FcbResourceAcquired = FALSE;
BOOLEAN FcbPagingIoResourceAcquired = 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;
__leave;
}
Irp = IrpContext->Irp;
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
if (!IsVcbInited(Vcb)) {
Status = STATUS_SUCCESS;
__leave;
}
FileObject = IrpContext->FileObject;
Fcb = (PEXT2_FCB) FileObject->FsContext;
if (!Fcb || (Fcb->Identifier.Type != EXT2VCB &&
Fcb->Identifier.Type != EXT2FCB)) {
Status = STATUS_SUCCESS;
__leave;
}
Mcb = Fcb->Mcb;
Ccb = (PEXT2_CCB) FileObject->FsContext2;
if (IsFlagOn(FileObject->Flags, FO_CLEANUP_COMPLETE)) {
Status = STATUS_SUCCESS;
__leave;
}
VcbResourceAcquired =
ExAcquireResourceExclusiveLite(
&Vcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT)
);
if (Fcb->Identifier.Type == EXT2VCB) {
if (IsFlagOn(Vcb->Flags, VCB_VOLUME_LOCKED) &&
(Vcb->LockFile == FileObject) ) {
ClearFlag(Vcb->Flags, VCB_VOLUME_LOCKED);
Vcb->LockFile = NULL;
Ext2ClearVpbFlag(Vcb->Vpb, VPB_LOCKED);
}
if (Ccb) {
Ext2DerefXcb(&Vcb->OpenHandleCount);
Ext2DerefXcb(&Vcb->OpenVolumeCount);
}
IoRemoveShareAccess(FileObject, &Vcb->ShareAccess);
Status = STATUS_SUCCESS;
__leave;
}
ASSERT((Fcb->Identifier.Type == EXT2FCB) &&
(Fcb->Identifier.Size == sizeof(EXT2_FCB)));
if (IsFlagOn(FileObject->Flags, FO_CLEANUP_COMPLETE)) {
if (IsFlagOn(FileObject->Flags, FO_FILE_MODIFIED) &&
IsFlagOn(Vcb->Flags, VCB_FLOPPY_DISK) &&
!IsFlagOn(Vcb->Flags, VCB_WRITE_PROTECTED) ) {
Status = Ext2FlushFile(IrpContext, Fcb, Ccb);
}
__leave;
}
if (Ccb == NULL) {
Status = STATUS_SUCCESS;
__leave;
}
if (IsDirectory(Fcb)) {
if (IsFlagOn(Ccb->Flags, CCB_DELETE_ON_CLOSE)) {
SetLongFlag(Fcb->Flags, FCB_DELETE_PENDING);
FsRtlNotifyFullChangeDirectory(
Vcb->NotifySync,
&Vcb->NotifyList,
Ccb,
NULL,
FALSE,
FALSE,
0,
NULL,
NULL,
NULL );
}
FsRtlNotifyCleanup(Vcb->NotifySync, &Vcb->NotifyList, Ccb);
}
ExReleaseResourceLite(&Vcb->MainResource);
VcbResourceAcquired = FALSE;
FcbResourceAcquired =
ExAcquireResourceExclusiveLite(
&Fcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT)
);
ASSERT((Ccb->Identifier.Type == EXT2CCB) &&
(Ccb->Identifier.Size == sizeof(EXT2_CCB)));
Ext2DerefXcb(&Vcb->OpenHandleCount);
Ext2DerefXcb(&Fcb->OpenHandleCount);
if (IsFlagOn(FileObject->Flags, FO_FILE_MODIFIED)) {
Fcb->Mcb->FileAttr |= FILE_ATTRIBUTE_ARCHIVE;
}
if (IsDirectory(Fcb)) {
ext3_release_dir(Fcb->Inode, &Ccb->filp);
} else {
if ( IsFlagOn(FileObject->Flags, FO_FILE_MODIFIED) &&
!IsFlagOn(Ccb->Flags, CCB_LAST_WRITE_UPDATED)) {
LARGE_INTEGER SysTime;
KeQuerySystemTime(&SysTime);
Fcb->Inode->i_atime =
Fcb->Inode->i_mtime = Ext2LinuxTime(SysTime);
Fcb->Mcb->LastAccessTime =
Fcb->Mcb->LastWriteTime = Ext2NtTime(Fcb->Inode->i_atime);
Ext2SaveInode(IrpContext, Vcb, Fcb->Inode);
Ext2NotifyReportChange(
IrpContext,
Vcb,
Fcb->Mcb,
FILE_NOTIFY_CHANGE_ATTRIBUTES |
FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_LAST_ACCESS,
FILE_ACTION_MODIFIED );
}
FsRtlCheckOplock( &Fcb->Oplock,
Irp,
IrpContext,
NULL,
NULL );
Fcb->Header.IsFastIoPossible = Ext2IsFastIoPossible(Fcb);
if (!IsFlagOn(FileObject->Flags, FO_CACHE_SUPPORTED)) {
Fcb->NonCachedOpenCount--;
}
if (IsFlagOn(Ccb->Flags, CCB_DELETE_ON_CLOSE)) {
SetLongFlag(Fcb->Flags, FCB_DELETE_PENDING);
}
//
// Drop any byte range locks this process may have on the file.
//
FsRtlFastUnlockAll(
&Fcb->FileLockAnchor,
FileObject,
IoGetRequestorProcess(Irp),
NULL );
//
// If there are no byte range locks owned by other processes on the
// file the fast I/O read/write functions doesn't have to check for
// locks so we set IsFastIoPossible to FastIoIsPossible again.
//
if (!FsRtlGetNextFileLock(&Fcb->FileLockAnchor, TRUE)) {
if (Fcb->Header.IsFastIoPossible != FastIoIsPossible) {
#if EXT2_DEBUG
DEBUG(DL_INF, (": %-16.16s %-31s %wZ\n",
Ext2GetCurrentProcessName(),
"FastIoIsPossible",
&Fcb->Mcb->FullName
));
#endif
Fcb->Header.IsFastIoPossible = FastIoIsPossible;
}
}
if (Fcb->OpenHandleCount == 0 &&
(IsFlagOn(Fcb->Flags, FCB_ALLOC_IN_CREATE) ||
IsFlagOn(Fcb->Flags, FCB_ALLOC_IN_WRITE)) ) {
LARGE_INTEGER Size;
ExAcquireResourceExclusiveLite(&Fcb->PagingIoResource, TRUE);
FcbPagingIoResourceAcquired = TRUE;
Size.QuadPart = CEILING_ALIGNED(ULONGLONG,
(ULONGLONG)Fcb->Mcb->Inode.i_size,
(ULONGLONG)BLOCK_SIZE);
if (!IsFlagOn(Fcb->Flags, FCB_DELETE_PENDING)) {
Ext2TruncateFile(IrpContext, Vcb, Fcb->Mcb, &Size);
Fcb->Header.ValidDataLength.QuadPart =
Fcb->Header.FileSize.QuadPart = Fcb->Mcb->Inode.i_size;
Fcb->Header.AllocationSize = Size;
if (CcIsFileCached(FileObject)) {
CcSetFileSizes(FileObject,
(PCC_FILE_SIZES)(&(Fcb->Header.AllocationSize)));
}
}
ClearLongFlag(Fcb->Flags, FCB_ALLOC_IN_CREATE|FCB_ALLOC_IN_WRITE);
ExReleaseResourceLite(&Fcb->PagingIoResource);
FcbPagingIoResourceAcquired = FALSE;
}
}
if (IsFlagOn(Fcb->Flags, FCB_DELETE_PENDING)) {
if (Fcb->OpenHandleCount == 0 || (Mcb = Ccb->SymLink)) {
//
// Ext2DeleteFile will acquire these lock inside
//
if (FcbResourceAcquired) {
ExReleaseResourceLite(&Fcb->MainResource);
FcbResourceAcquired = FALSE;
}
//
// this file is to be deleted ...
//
if (Ccb->SymLink) {
Mcb = Ccb->SymLink;
FileObject->DeletePending = FALSE;
}
Status = Ext2DeleteFile(IrpContext, Vcb, Fcb, Mcb);
if (NT_SUCCESS(Status)) {
if (IsMcbDirectory(Mcb)) {
Ext2NotifyReportChange( IrpContext, Vcb, Mcb,
FILE_NOTIFY_CHANGE_DIR_NAME,
FILE_ACTION_REMOVED );
} else {
Ext2NotifyReportChange( IrpContext, Vcb, Mcb,
FILE_NOTIFY_CHANGE_FILE_NAME,
FILE_ACTION_REMOVED );
}
}
//
// re-acquire the main resource lock
//
FcbResourceAcquired =
ExAcquireResourceExclusiveLite(
&Fcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT)
);
if (CcIsFileCached(FileObject)) {
CcSetFileSizes(FileObject,
(PCC_FILE_SIZES)(&(Fcb->Header.AllocationSize)));
SetFlag(FileObject->Flags, FO_FILE_MODIFIED);
}
}
}
if (!IsDirectory(Fcb)) {
if ( IsFlagOn(FileObject->Flags, FO_CACHE_SUPPORTED) &&
(Fcb->NonCachedOpenCount + 1 == Fcb->ReferenceCount) &&
(Fcb->SectionObject.DataSectionObject != NULL)) {
if (!IsFlagOn(Vcb->Flags, VCB_READ_ONLY) &&
!IsFlagOn(Vcb->Flags, VCB_WRITE_PROTECTED) ) {
CcFlushCache(&Fcb->SectionObject, NULL, 0, NULL);
}
if (ExAcquireResourceExclusiveLite(&(Fcb->PagingIoResource), TRUE)) {
ExReleaseResourceLite(&(Fcb->PagingIoResource));
}
CcPurgeCacheSection( &Fcb->SectionObject,
NULL,
0,
FALSE );
}
CcUninitializeCacheMap(FileObject, NULL, NULL);
}
IoRemoveShareAccess(FileObject, &Fcb->ShareAccess);
DEBUG(DL_INF, ( "Ext2Cleanup: OpenCount=%u ReferCount=%u NonCahcedCount=%xh %wZ\n",
Fcb->OpenHandleCount, Fcb->ReferenceCount, Fcb->NonCachedOpenCount, &Fcb->Mcb->FullName));
Status = STATUS_SUCCESS;
if (FileObject) {
SetFlag(FileObject->Flags, FO_CLEANUP_COMPLETE);
}
} __finally {
if (FcbPagingIoResourceAcquired) {
ExReleaseResourceLite(&Fcb->PagingIoResource);
}
if (FcbResourceAcquired) {
ExReleaseResourceLite(&Fcb->MainResource);
}
if (VcbResourceAcquired) {
ExReleaseResourceLite(&Vcb->MainResource);
}
if (!IrpContext->ExceptionInProgress) {
if (Status == STATUS_PENDING) {
Ext2QueueRequest(IrpContext);
} else {
IrpContext->Irp->IoStatus.Status = Status;
Ext2CompleteIrpContext(IrpContext, Status);
}
}
}
return Status;
}
NTSTATUS
Ext2SetVolumeInformation (IN PEXT2_IRP_CONTEXT IrpContext)
{
PDEVICE_OBJECT DeviceObject;
NTSTATUS Status = STATUS_UNSUCCESSFUL;
PEXT2_VCB Vcb;
PIRP Irp;
PIO_STACK_LOCATION IoStackLocation;
FS_INFORMATION_CLASS FsInformationClass;
BOOLEAN VcbResourceAcquired = FALSE;
__try {
ASSERT(IrpContext != NULL);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
//
// This request is not allowed on the main device object
//
if (IsExt2FsDevice(DeviceObject)) {
Status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
ASSERT(IsMounted(Vcb));
if (IsFlagOn(Vcb->Flags, VCB_READ_ONLY)) {
Status = STATUS_MEDIA_WRITE_PROTECTED;
__leave;
}
if (!ExAcquireResourceExclusiveLite(
&Vcb->MainResource, TRUE)) {
Status = STATUS_PENDING;
__leave;
}
VcbResourceAcquired = TRUE;
Ext2VerifyVcb(IrpContext, Vcb);
Irp = IrpContext->Irp;
IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
//Notes: SetVolume is not defined in ntddk.h of win2k ddk,
// But it's same to QueryVolume ....
FsInformationClass =
IoStackLocation->Parameters./*SetVolume*/QueryVolume.FsInformationClass;
switch (FsInformationClass) {
case FileFsLabelInformation:
{
PFILE_FS_LABEL_INFORMATION VolLabelInfo = NULL;
ULONG VolLabelLen;
UNICODE_STRING LabelName ;
OEM_STRING OemName;
VolLabelInfo = (PFILE_FS_LABEL_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
VolLabelLen = VolLabelInfo->VolumeLabelLength;
if (VolLabelLen > (16 * sizeof(WCHAR))) {
Status = STATUS_INVALID_VOLUME_LABEL;
__leave;
}
RtlCopyMemory( Vcb->Vpb->VolumeLabel,
VolLabelInfo->VolumeLabel,
VolLabelLen );
RtlZeroMemory(Vcb->SuperBlock->s_volume_name, 16);
LabelName.Buffer = VolLabelInfo->VolumeLabel;
LabelName.MaximumLength = (USHORT)16 * sizeof(WCHAR);
LabelName.Length = (USHORT)VolLabelLen;
OemName.Buffer = SUPER_BLOCK->s_volume_name;
OemName.Length = 0;
OemName.MaximumLength = 16;
Ext2UnicodeToOEM(Vcb, &OemName, &LabelName);
Vcb->Vpb->VolumeLabelLength = (USHORT) VolLabelLen;
if (Ext2SaveSuper(IrpContext, Vcb)) {
Status = STATUS_SUCCESS;
}
Irp->IoStatus.Information = 0;
}
break;
default:
Status = STATUS_INVALID_INFO_CLASS;
}
} __finally {
if (VcbResourceAcquired) {
ExReleaseResourceLite(&Vcb->MainResource);
}
if (!IrpContext->ExceptionInProgress) {
if (Status == STATUS_PENDING) {
Ext2QueueRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
}
}
return Status;
}
NTSTATUS
Ext2QueryVolumeInformation (IN PEXT2_IRP_CONTEXT IrpContext)
{
PDEVICE_OBJECT DeviceObject;
NTSTATUS Status = STATUS_UNSUCCESSFUL;
PEXT2_VCB Vcb;
PIRP Irp;
PIO_STACK_LOCATION IoStackLocation;
FS_INFORMATION_CLASS FsInformationClass;
ULONG Length;
PVOID Buffer;
BOOLEAN VcbResourceAcquired = FALSE;
__try {
ASSERT(IrpContext != NULL);
ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
(IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
DeviceObject = IrpContext->DeviceObject;
//
// This request is not allowed on the main device object
//
if (IsExt2FsDevice(DeviceObject)) {
Status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
ASSERT(Vcb != NULL);
ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
(Vcb->Identifier.Size == sizeof(EXT2_VCB)));
if (!IsMounted(Vcb)) {
Status = STATUS_VOLUME_DISMOUNTED;
__leave;
}
if (!ExAcquireResourceSharedLite(
&Vcb->MainResource,
IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT)
)) {
Status = STATUS_PENDING;
__leave;
}
VcbResourceAcquired = TRUE;
Irp = IrpContext->Irp;
IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
FsInformationClass =
IoStackLocation->Parameters.QueryVolume.FsInformationClass;
Length = IoStackLocation->Parameters.QueryVolume.Length;
Buffer = Irp->AssociatedIrp.SystemBuffer;
RtlZeroMemory(Buffer, Length);
switch (FsInformationClass) {
case FileFsVolumeInformation:
{
PFILE_FS_VOLUME_INFORMATION FsVolInfo;
ULONG VolumeLabelLength;
ULONG RequiredLength;
if (Length < sizeof(FILE_FS_VOLUME_INFORMATION)) {
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
FsVolInfo = (PFILE_FS_VOLUME_INFORMATION) Buffer;
FsVolInfo->VolumeCreationTime.QuadPart = 0;
FsVolInfo->VolumeSerialNumber = Vcb->Vpb->SerialNumber;
VolumeLabelLength = Vcb->Vpb->VolumeLabelLength;
FsVolInfo->VolumeLabelLength = VolumeLabelLength;
/* We don't support ObjectId */
FsVolInfo->SupportsObjects = FALSE;
RequiredLength = sizeof(FILE_FS_VOLUME_INFORMATION)
+ VolumeLabelLength - sizeof(WCHAR);
if (Length < RequiredLength) {
Irp->IoStatus.Information =
sizeof(FILE_FS_VOLUME_INFORMATION);
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
RtlCopyMemory(FsVolInfo->VolumeLabel, Vcb->Vpb->VolumeLabel, Vcb->Vpb->VolumeLabelLength);
Irp->IoStatus.Information = RequiredLength;
Status = STATUS_SUCCESS;
}
break;
case FileFsSizeInformation:
{
PFILE_FS_SIZE_INFORMATION FsSizeInfo;
if (Length < sizeof(FILE_FS_SIZE_INFORMATION)) {
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
FsSizeInfo = (PFILE_FS_SIZE_INFORMATION) Buffer;
FsSizeInfo->TotalAllocationUnits.QuadPart =
ext3_blocks_count(SUPER_BLOCK);
FsSizeInfo->AvailableAllocationUnits.QuadPart =
ext3_free_blocks_count(SUPER_BLOCK);
FsSizeInfo->SectorsPerAllocationUnit =
Vcb->BlockSize / Vcb->DiskGeometry.BytesPerSector;
FsSizeInfo->BytesPerSector =
Vcb->DiskGeometry.BytesPerSector;
Irp->IoStatus.Information = sizeof(FILE_FS_SIZE_INFORMATION);
Status = STATUS_SUCCESS;
}
break;
case FileFsDeviceInformation:
{
PFILE_FS_DEVICE_INFORMATION FsDevInfo;
if (Length < sizeof(FILE_FS_DEVICE_INFORMATION)) {
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
FsDevInfo = (PFILE_FS_DEVICE_INFORMATION) Buffer;
FsDevInfo->DeviceType =
Vcb->TargetDeviceObject->DeviceType;
if (FsDevInfo->DeviceType != FILE_DEVICE_DISK) {
DbgBreak();
}
FsDevInfo->Characteristics =
Vcb->TargetDeviceObject->Characteristics;
if (FlagOn(Vcb->Flags, VCB_READ_ONLY)) {
SetFlag( FsDevInfo->Characteristics,
FILE_READ_ONLY_DEVICE );
}
Irp->IoStatus.Information = sizeof(FILE_FS_DEVICE_INFORMATION);
Status = STATUS_SUCCESS;
}
break;
case FileFsAttributeInformation:
{
PFILE_FS_ATTRIBUTE_INFORMATION FsAttrInfo;
ULONG RequiredLength;
if (Length < sizeof(FILE_FS_ATTRIBUTE_INFORMATION)) {
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
FsAttrInfo =
(PFILE_FS_ATTRIBUTE_INFORMATION) Buffer;
FsAttrInfo->FileSystemAttributes =
FILE_CASE_SENSITIVE_SEARCH | FILE_CASE_PRESERVED_NAMES;
FsAttrInfo->MaximumComponentNameLength = EXT2_NAME_LEN;
FsAttrInfo->FileSystemNameLength = 8;
RequiredLength = sizeof(FILE_FS_ATTRIBUTE_INFORMATION) +
8 - sizeof(WCHAR);
if (Length < RequiredLength) {
Irp->IoStatus.Information =
sizeof(FILE_FS_ATTRIBUTE_INFORMATION);
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
if (Vcb->IsExt3fs) {
RtlCopyMemory(FsAttrInfo->FileSystemName, L"EXT3\0", 10);
} else {
RtlCopyMemory(FsAttrInfo->FileSystemName, L"EXT2\0", 10);
}
Irp->IoStatus.Information = RequiredLength;
Status = STATUS_SUCCESS;
}
break;
#if (_WIN32_WINNT >= 0x0500)
case FileFsFullSizeInformation:
{
PFILE_FS_FULL_SIZE_INFORMATION PFFFSI;
if (Length < sizeof(FILE_FS_FULL_SIZE_INFORMATION)) {
Status = STATUS_BUFFER_OVERFLOW;
__leave;
}
PFFFSI = (PFILE_FS_FULL_SIZE_INFORMATION) Buffer;
/*
typedef struct _FILE_FS_FULL_SIZE_INFORMATION {
LARGE_INTEGER TotalAllocationUnits;
LARGE_INTEGER CallerAvailableAllocationUnits;
LARGE_INTEGER ActualAvailableAllocationUnits;
ULONG SectorsPerAllocationUnit;
ULONG BytesPerSector;
} FILE_FS_FULL_SIZE_INFORMATION, *PFILE_FS_FULL_SIZE_INFORMATION;
*/
{
PFFFSI->TotalAllocationUnits.QuadPart =
ext3_blocks_count(SUPER_BLOCK);
PFFFSI->CallerAvailableAllocationUnits.QuadPart =
ext3_free_blocks_count(SUPER_BLOCK);
/* - Vcb->SuperBlock->s_r_blocks_count; */
PFFFSI->ActualAvailableAllocationUnits.QuadPart =
ext3_free_blocks_count(SUPER_BLOCK);
}
PFFFSI->SectorsPerAllocationUnit =
Vcb->BlockSize / Vcb->DiskGeometry.BytesPerSector;
PFFFSI->BytesPerSector = Vcb->DiskGeometry.BytesPerSector;
Irp->IoStatus.Information = sizeof(FILE_FS_FULL_SIZE_INFORMATION);
Status = STATUS_SUCCESS;
}
break;
#endif // (_WIN32_WINNT >= 0x0500)
default:
Status = STATUS_INVALID_INFO_CLASS;
break;
}
} __finally {
if (VcbResourceAcquired) {
ExReleaseResourceLite(&Vcb->MainResource);
}
if (!IrpContext->ExceptionInProgress) {
if (Status == STATUS_PENDING) {
Ext2QueueRequest(IrpContext);
} else {
Ext2CompleteIrpContext(IrpContext, Status);
}
}
}
return Status;
}
