Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / drivers / filesystems / ext2 / src / lock.c

diff --git a/drivers/filesystems/ext2/src/lock.c b/drivers/filesystems/ext2/src/lock.c
new file mode 100644 (file)
index 0000000..640162a
--- /dev/null
+++ b/drivers/filesystems/ext2/src/lock.c
@@ -0,0 +1,125 @@
+/*
+ * COPYRIGHT:        See COPYRIGHT.TXT
+ * PROJECT:          Ext2 File System Driver for WinNT/2K/XP
+ * FILE:             lock.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, Ext2LockControl)
+#endif
+
+NTSTATUS
+Ext2LockControl (IN PEXT2_IRP_CONTEXT IrpContext)
+{
+    PDEVICE_OBJECT  DeviceObject = NULL;
+    PFILE_OBJECT    FileObject = NULL;
+    PEXT2_FCB       Fcb = NULL;
+    PIRP            Irp = NULL;
+
+    NTSTATUS        Status = STATUS_UNSUCCESSFUL;
+    BOOLEAN         CompleteContext = TRUE;
+    BOOLEAN         CompleteIrp = TRUE;
+    BOOLEAN         bFcbAcquired = FALSE;
+
+    _SEH2_TRY {
+
+        ASSERT(IrpContext != NULL);
+
+        ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
+               (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
+
+        DeviceObject = IrpContext->DeviceObject;
+
+        if (IsExt2FsDevice(DeviceObject)) {
+            Status = STATUS_INVALID_DEVICE_REQUEST;
+            _SEH2_LEAVE;
+        }
+
+        FileObject = IrpContext->FileObject;
+
+        Fcb = (PEXT2_FCB) FileObject->FsContext;
+        ASSERT(Fcb != NULL);
+        if (Fcb->Identifier.Type == EXT2VCB) {
+            Status = STATUS_INVALID_PARAMETER;
+            _SEH2_LEAVE;
+        }
+
+        ASSERT((Fcb->Identifier.Type == EXT2FCB) &&
+               (Fcb->Identifier.Size == sizeof(EXT2_FCB)));
+
+        if (FlagOn(Fcb->Mcb->FileAttr, FILE_ATTRIBUTE_DIRECTORY)) {
+            Status = STATUS_INVALID_PARAMETER;
+            _SEH2_LEAVE;
+        }
+
+        ExAcquireResourceSharedLite(&Fcb->MainResource, TRUE);
+        bFcbAcquired = TRUE;
+
+        Irp = IrpContext->Irp;
+
+        CompleteIrp = FALSE;
+
+        Status = FsRtlCheckOplock( &Fcb->Oplock,
+                                   Irp,
+                                   IrpContext,
+                                   Ext2OplockComplete,
+                                   NULL );
+
+        if (Status != STATUS_SUCCESS) {
+            CompleteContext = FALSE;
+            _SEH2_LEAVE;
+        }
+
+        //
+        // FsRtlProcessFileLock acquires FileObject->FsContext->Resource while
+        // modifying the file locks and calls IoCompleteRequest when it's done.
+        //
+
+        Status = FsRtlProcessFileLock(
+                     &Fcb->FileLockAnchor,
+                     Irp,
+                     NULL );
+#if EXT2_DEBUG
+        if (!NT_SUCCESS(Status)) {
+            DEBUG(DL_ERR, (
+                      "Ext2LockControl: %-16.16s %-31s Status: %#x ***\n",
+                      Ext2GetCurrentProcessName(),
+                      "IRP_MJ_LOCK_CONTROL",
+                      Status          ));
+        }
+#endif
+        Fcb->Header.IsFastIoPossible = Ext2IsFastIoPossible(Fcb);
+
+    } _SEH2_FINALLY {
+
+        if (bFcbAcquired) {
+            ExReleaseResourceLite(&Fcb->MainResource);
+        }
+
+        if (!IrpContext->ExceptionInProgress) {
+
+            if (!CompleteIrp) {
+                IrpContext->Irp = NULL;
+            }
+
+            if (CompleteContext) {
+                Ext2CompleteIrpContext(IrpContext, Status);
+            }
+        }
+    } _SEH2_END;
+
+    return Status;
+}