From b2eee21330a67de2f1c70d195b4707b4c95e7123 Mon Sep 17 00:00:00 2001
From: Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
Date: Sat, 11 Nov 2017 06:03:48 +0900
Subject: [PATCH] CdfsDismountVolume

---
 drivers/filesystems/cdfs/fsctl.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/filesystems/cdfs/fsctl.c b/drivers/filesystems/cdfs/fsctl.c
index 925819fb8e..80546db46b 100644
--- a/drivers/filesystems/cdfs/fsctl.c
+++ b/drivers/filesystems/cdfs/fsctl.c
@@ -607,6 +607,39 @@ CdfsLockOrUnlockVolume(
     return STATUS_SUCCESS;
 }
 
+static
+NTSTATUS
+CdfsDismountVolume(
+    IN PCDFS_IRP_CONTEXT IrpContext)
+{
+    PFCB Fcb;
+    PFILE_OBJECT FileObject;
+    PDEVICE_EXTENSION DeviceExt;
+    PDEVICE_OBJECT DeviceObject = NULL;
+
+    FileObject = IrpContext->FileObject;
+    Fcb = FileObject->FsContext;
+    if (!BooleanFlagOn(Fcb->Flags, FCB_IS_VOLUME_STREAM))
+        return STATUS_ACCESS_DENIED;
+
+    DeviceExt = IrpContext->DeviceObject->DeviceExtension;
+    if (DeviceExt)
+    {
+        DeviceObject = DeviceExt->VolumeDevice;
+        DeviceExt->VolumeDevice = NULL;
+    }
+    if (DeviceExt && DeviceExt->StreamFileObject)
+    {
+        ObDereferenceObject(DeviceExt->StreamFileObject);
+        DeviceExt->StreamFileObject = NULL;
+    }
+    if (Fcb)
+        ExFreePoolWithTag(Fcb, CDFS_NONPAGED_FCB_TAG);
+    if (DeviceObject)
+        IoDeleteDevice(DeviceObject);
+
+    return STATUS_SUCCESS;
+}
 
 NTSTATUS
 NTAPI
@@ -673,6 +706,11 @@ CdfsFileSystemControl(
                     Status = CdfsLockOrUnlockVolume(IrpContext, FALSE);
                     break;
 
+                case FSCTL_DISMOUNT_VOLUME:
+                    DPRINT("CDFS: IRP_MN_USER_FS_REQUEST / FSCTL_DISMOUNT_VOLUME\n");
+                    Status = CdfsDismountVolume(IrpContext);
+                    break;
+
                 default:
                     DPRINT1("CDFS: IRP_MN_USER_FS_REQUEST / Unknown IoControlCode 0x%x\n",
                     Stack->Parameters.DeviceIoControl.IoControlCode);
-- 
2.14.2