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sys: IRP_MJ_FLUSH_BUFFERS

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This commit is contained in:
Bill Zissimopoulos
2016-04-02 11:38:24 -07:00
parent b187d47bca
commit e6ab31a0e0
8 changed files with 128 additions and 4 deletions
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72
src/sys/flush.c
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@ -9,20 +9,74 @@
static NTSTATUS FspFsvolFlushBuffers(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp);
FSP_IOCMPL_DISPATCH FspFsvolFlushBuffersComplete;
static FSP_IOP_REQUEST_FINI FspFsvolFlushBuffersRequestFini;
FSP_DRIVER_DISPATCH FspFlushBuffers;
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FspFsvolFlushBuffers)
#pragma alloc_text(PAGE, FspFsvolFlushBuffersComplete)
#pragma alloc_text(PAGE, FspFsvolFlushBuffersRequestFini)
#pragma alloc_text(PAGE, FspFlushBuffers)
#endif
enum
{
/* FlushBuffers */
RequestFileNode = 0,
};
static NTSTATUS FspFsvolFlushBuffers(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
{
PAGED_CODE();
return STATUS_INVALID_DEVICE_REQUEST;
NTSTATUS Result;
FSP_FSCTL_TRANSACT_REQ *Request;
/* is this a valid FileObject? */
if (!FspFileNodeIsValid(IrpSp->FileObject->FsContext))
{
/* indicate that we are flushing the whole volume! */
Result = FspIopCreateRequest(Irp, 0, 0, &Request);
if (!NT_SUCCESS(Result))
return Result;
Request->Kind = FspFsctlTransactFlushBuffersKind;
return FSP_STATUS_IOQ_POST;
}
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
FSP_FILE_DESC *FileDesc = FileObject->FsContext2;
IO_STATUS_BLOCK IoStatus;
ASSERT(FileNode == FileDesc->FileNode);
FspFileNodeAcquireExclusive(FileNode, Full);
Result = FspCcFlushCache(FileObject->SectionObjectPointer, 0, 0, &IoStatus);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Result = FspIopCreateRequestEx(Irp, 0, 0, FspFsvolFlushBuffersRequestFini, &Request);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Request->Kind = FspFsctlTransactFlushBuffersKind;
Request->Req.FlushBuffers.UserContext = FileNode->UserContext;
Request->Req.FlushBuffers.UserContext2 = FileDesc->UserContext2;
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestFileNode) = FileNode;
return FSP_STATUS_IOQ_POST;
}
NTSTATUS FspFsvolFlushBuffersComplete(
@ -30,7 +84,18 @@ NTSTATUS FspFsvolFlushBuffersComplete(
{
FSP_ENTER_IOC(PAGED_CODE());
FSP_LEAVE_IOC("%s", "");
FSP_LEAVE_IOC("FileObject=%p",
IrpSp->FileObject);
}
static VOID FspFsvolFlushBuffersRequestFini(FSP_FSCTL_TRANSACT_REQ *Request, PVOID Context[4])
{
PAGED_CODE();
FSP_FILE_NODE *FileNode = Context[RequestFileNode];
if (0 != FileNode)
FspFileNodeReleaseOwner(FileNode, Full, Request);
}
NTSTATUS FspFlushBuffers(
@ -46,5 +111,6 @@ NTSTATUS FspFlushBuffers(
FSP_RETURN(Result = STATUS_INVALID_DEVICE_REQUEST);
}
FSP_LEAVE_MJ("%s", "");
FSP_LEAVE_MJ("FileObject=%p",
IrpSp->FileObject);
}