static NTSTATUS FspFsvolQuerySecurity(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
{
PAGED_CODE();
/* is this a valid FileObject? */
if (!FspFileNodeIsValid(IrpSp->FileObject->FsContext))
return STATUS_INVALID_DEVICE_REQUEST;
NTSTATUS Result;
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
FSP_FILE_DESC *FileDesc = FileObject->FsContext2;
SECURITY_INFORMATION SecurityInformation = IrpSp->Parameters.QuerySecurity.SecurityInformation;
PVOID Buffer = Irp->UserBuffer;
ULONG Length = IrpSp->Parameters.QuerySecurity.Length;
PVOID SecurityBuffer;
FSP_FSCTL_TRANSACT_REQ *Request;
ASSERT(FileNode == FileDesc->FileNode);
FspFileNodeAcquireShared(FileNode, Main);
if (FspFileNodeReferenceSecurity(FileNode, &SecurityBuffer, 0))
{
FspFileNodeRelease(FileNode, Main);
Result = FspQuerySecurityDescriptorInfo(SecurityInformation, Buffer, &Length, SecurityBuffer);
FspFileNodeDereferenceSecurity(SecurityBuffer);
Irp->IoStatus.Information = Length;
return Result;
}
FspFileNodeAcquireShared(FileNode, Pgio);
Result = FspBufferUserBuffer(Irp, Length, IoWriteAccess);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Result = FspIopCreateRequestEx(Irp, 0, 0, FspFsvolQuerySecurityRequestFini, &Request);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Request->Kind = FspFsctlTransactQuerySecurityKind;
Request->Req.QuerySecurity.UserContext = FileNode->UserContext;
Request->Req.QuerySecurity.UserContext2 = FileDesc->UserContext2;
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestFileNode) = FileNode;
return FSP_STATUS_IOQ_POST;
}
static NTSTATUS FspFsvolSetSecurity(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
{
PAGED_CODE();
/* is this a valid FileObject? */
if (!FspFileNodeIsValid(IrpSp->FileObject->FsContext))
return STATUS_INVALID_DEVICE_REQUEST;
NTSTATUS Result;
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
FSP_FILE_DESC *FileDesc = FileObject->FsContext2;
SECURITY_INFORMATION SecurityInformation = IrpSp->Parameters.SetSecurity.SecurityInformation;
PSECURITY_DESCRIPTOR SecurityDescriptor = IrpSp->Parameters.SetSecurity.SecurityDescriptor;
ULONG SecurityDescriptorSize = 0;
ASSERT(FileNode == FileDesc->FileNode);
#if 0
/* captured security descriptor is always valid */
if (0 == SecurityDescriptor || !RtlValidSecurityDescriptor(SecurityDescriptor))
return STATUS_INVALID_PARAMETER;
#endif
SecurityDescriptorSize = RtlLengthSecurityDescriptor(SecurityDescriptor);
FspFileNodeAcquireExclusive(FileNode, Full);
FSP_FSCTL_TRANSACT_REQ *Request;
Result = FspIopCreateRequestEx(Irp, 0, SecurityDescriptorSize, FspFsvolSetSecurityRequestFini,
&Request);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Request->Kind = FspFsctlTransactSetSecurityKind;
Request->Req.SetSecurity.UserContext = FileNode->UserContext;
Request->Req.SetSecurity.UserContext2 = FileDesc->UserContext2;
Request->Req.SetSecurity.SecurityInformation = SecurityInformation;
Request->Req.SetSecurity.SecurityDescriptor.Offset = 0;
Request->Req.SetSecurity.SecurityDescriptor.Size = (UINT16)SecurityDescriptorSize;
RtlCopyMemory(Request->Buffer, SecurityDescriptor, SecurityDescriptorSize);
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestFileNode) = FileNode;
return FSP_STATUS_IOQ_POST;
}
static NTSTATUS FspFsvolWriteNonCached(
PDEVICE_OBJECT FsvolDeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp,
BOOLEAN CanWait)
{
PAGED_CODE();
/* assert: either a top-level IRP or Paging I/O */
ASSERT(0 == FspIrpTopFlags(Irp) || FlagOn(Irp->Flags, IRP_PAGING_IO));
NTSTATUS Result;
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
FSP_FILE_DESC *FileDesc = FileObject->FsContext2;
LARGE_INTEGER WriteOffset = IrpSp->Parameters.Write.ByteOffset;
ULONG WriteLength = IrpSp->Parameters.Write.Length;
ULONG WriteKey = IrpSp->Parameters.Write.Key;
BOOLEAN WriteToEndOfFile =
FILE_WRITE_TO_END_OF_FILE == WriteOffset.LowPart && -1L == WriteOffset.HighPart;
BOOLEAN PagingIo = BooleanFlagOn(Irp->Flags, IRP_PAGING_IO);
FSP_FSCTL_TRANSACT_REQ *Request;
BOOLEAN Success;
ASSERT(FileNode == FileDesc->FileNode);
/* no MDL requests on the non-cached path */
if (FlagOn(IrpSp->MinorFunction, IRP_MN_MDL))
return STATUS_INVALID_PARAMETER;
/* paging I/O cannot change the file size */
if (PagingIo && WriteToEndOfFile)
return STATUS_INVALID_PARAMETER;
/* stop CcWriteBehind from calling me! */
if (FspIoqStopped(FspFsvolDeviceExtension(FsvolDeviceObject)->Ioq))
return FspFsvolDeviceStoppedStatus(FsvolDeviceObject);
/* probe and lock the user buffer */
Result = FspLockUserBuffer(Irp, WriteLength, IoReadAccess);
if (!NT_SUCCESS(Result))
return Result;
/* acquire FileNode exclusive Full */
Success = DEBUGTEST(90) &&
FspFileNodeTryAcquireExclusiveF(FileNode, FspFileNodeAcquireFull, CanWait);
if (!Success)
return FspWqRepostIrpWorkItem(Irp, FspFsvolWriteNonCached, 0);
/* perform oplock check */
if (!PagingIo)
{
Result = FspFileNodeOplockCheckAsync(
FileNode, FspFileNodeAcquireFull, FspFsvolWriteNonCached,
Irp);
if (STATUS_PENDING == Result)
return Result;
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
}
/* check the file locks */
if (!PagingIo && !FsRtlCheckLockForWriteAccess(&FileNode->FileLock, Irp))
{
FspFileNodeRelease(FileNode, Full);
return STATUS_FILE_LOCK_CONFLICT;
}
/* if this is a non-cached transfer on a cached file then flush and purge the file */
if (!PagingIo && 0 != FileObject->SectionObjectPointer->DataSectionObject)
{
if (!CanWait)
{
FspFileNodeRelease(FileNode, Full);
return FspWqRepostIrpWorkItem(Irp, FspFsvolWriteNonCached, 0);
}
Result = FspFileNodeFlushAndPurgeCache(FileNode,
IrpSp->Parameters.Write.ByteOffset.QuadPart,
IrpSp->Parameters.Write.Length,
TRUE);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
}
Request = FspIrpRequest(Irp);
if (0 == Request)
{
/* create request */
Result = FspIopCreateRequestEx(Irp, 0, 0, FspFsvolWriteNonCachedRequestFini, &Request);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
}
else
{
/* reuse existing request */
ASSERT(Request->Size == sizeof *Request);
ASSERT(Request->Hint == (UINT_PTR)Irp);
FspIopResetRequest(Request, FspFsvolWriteNonCachedRequestFini);
RtlZeroMemory(&Request->Req,
sizeof *Request - FIELD_OFFSET(FSP_FSCTL_TRANSACT_REQ, Req));
}
Request->Kind = FspFsctlTransactWriteKind;
Request->Req.Write.UserContext = FileNode->UserContext;
Request->Req.Write.UserContext2 = FileDesc->UserContext2;
Request->Req.Write.Offset = WriteOffset.QuadPart;
Request->Req.Write.Length = WriteLength;
Request->Req.Write.Key = WriteKey;
Request->Req.Write.ConstrainedIo = !!PagingIo;
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestIrp) = Irp;
FSP_STATISTICS *Statistics = FspFsvolDeviceStatistics(FsvolDeviceObject);
if (PagingIo)
{
FspStatisticsInc(Statistics, Base.UserFileWrites);
FspStatisticsAdd(Statistics, Base.UserFileWriteBytes, WriteLength);
FspStatisticsInc(Statistics, Base.UserDiskWrites);
}
else
{
FspStatisticsInc(Statistics, Specific.NonCachedWrites);
FspStatisticsAdd(Statistics, Specific.NonCachedWriteBytes, WriteLength);
FspStatisticsInc(Statistics, Specific.NonCachedDiskWrites);
}
return FSP_STATUS_IOQ_POST;
}