[pschweitzer] 65129: [FASTFAT] On the road for getting rid of IopParseDevice() hack.... - Add support for FSCTL_LOCK_VOLUME, FSCTL_UNLOCK_VOLUME, FSCTL_DISMOUNT_VOLUME in VfatFileSystemControl() - ...

Author: pschweitzer
Date: Thu Oct 30 20:56:40 2014
New Revision: 65129

URL: http://svn.reactos.org/svn/reactos?rev=65129&view=rev
Log:
[FASTFAT]
On the road for getting rid of IopParseDevice() hack....

- Add support for FSCTL_LOCK_VOLUME, FSCTL_UNLOCK_VOLUME, FSCTL_DISMOUNT_VOLUME in
VfatFileSystemControl()
- Implement VfatLockOrUnlockVolume(). This brings some kind of volume locking to FastFAT
FSD. It's likely not fully accurate and welcome to race conditions. But, its main
purpose is to be used in usetup. So, this is fine for now.
- Stubplement VfatDismountVolume(). This will be implemented later on, but should be
relatively straightforward as it requires volume to be locked (so, we're the last ones
on it :-)).

Modified:
    trunk/reactos/drivers/filesystems/fastfat/cleanup.c
    trunk/reactos/drivers/filesystems/fastfat/create.c
    trunk/reactos/drivers/filesystems/fastfat/fsctl.c
    trunk/reactos/drivers/filesystems/fastfat/vfat.h

Modified: trunk/reactos/drivers/filesystems/fastfat/cleanup.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/cleanup.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/cleanup.c	[iso-8859-1] Thu Oct 30 20:56:40
2014
@@ -24,6 +24,7 @@
     PVFAT_IRP_CONTEXT IrpContext)
 {
     PVFATFCB pFcb;
+    PDEVICE_EXTENSION DeviceExt = IrpContext->DeviceExt;
     PFILE_OBJECT FileObject = IrpContext->FileObject;
 
     DPRINT("VfatCleanupFile(DeviceExt %p, FileObject %p)\n",
@@ -37,6 +38,7 @@
     if (pFcb->Flags & FCB_IS_VOLUME)
     {
         pFcb->OpenHandleCount--;
+        DeviceExt->OpenHandleCount--;
 
         if (pFcb->OpenHandleCount != 0)
         {
@@ -63,6 +65,7 @@
                            FileObject->FsContext2);
 
         pFcb->OpenHandleCount--;
+        DeviceExt->OpenHandleCount--;
 
         if (!(*pFcb->Attributes & FILE_ATTRIBUTE_DIRECTORY) &&
             FsRtlAreThereCurrentFileLocks(&pFcb->FileLock))

Modified: trunk/reactos/drivers/filesystems/fastfat/create.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/create.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/create.c	[iso-8859-1] Thu Oct 30 20:56:40
2014
@@ -473,10 +473,18 @@
         return STATUS_INVALID_PARAMETER;
     }
 
+    /* Deny create if the volume is locked */
+    if (DeviceExt->Flags & VCB_VOLUME_LOCKED)
+    {
+        return STATUS_ACCESS_DENIED;
+    }
+
     /* This a open operation for the volume itself */
     if (FileObject->FileName.Length == 0 &&
         (FileObject->RelatedFileObject == NULL ||
FileObject->RelatedFileObject->FsContext2 != NULL))
     {
+        DPRINT1("Volume opening\n");
+
         if (RequestedDisposition != FILE_OPEN &&
             RequestedDisposition != FILE_OPEN_IF)
         {
@@ -497,6 +505,7 @@
 
         pFcb = DeviceExt->VolumeFcb;
         vfatAttachFCBToFileObject(DeviceExt, pFcb, FileObject);
+        DeviceExt->OpenHandleCount++;
 
         Irp->IoStatus.Information = FILE_OPENED;
         return STATUS_SUCCESS;
@@ -639,6 +648,7 @@
             }
 
             pFcb->OpenHandleCount++;
+            DeviceExt->OpenHandleCount++;
         }
         else if (ParentFcb != NULL)
         {
@@ -884,6 +894,7 @@
     }
 
     pFcb->OpenHandleCount++;
+    DeviceExt->OpenHandleCount++;
 
     /* FIXME : test write access if requested */
 

Modified: trunk/reactos/drivers/filesystems/fastfat/fsctl.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/fsctl.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/fsctl.c	[iso-8859-1] Thu Oct 30 20:56:40
2014
@@ -612,6 +612,8 @@
     FsRtlNotifyInitializeSync(&DeviceExt->NotifySync);
     InitializeListHead(&DeviceExt->NotifyList);
 
+    DPRINT1("Mount success\n");
+
     Status = STATUS_SUCCESS;
 
 ByeBye:
@@ -855,6 +857,72 @@
     return Status;
 }
 
+static
+NTSTATUS
+VfatLockOrUnlockVolume(
+    PVFAT_IRP_CONTEXT IrpContext,
+    BOOLEAN Lock)
+{
+    PFILE_OBJECT FileObject;
+    PDEVICE_EXTENSION DeviceExt;
+
+    DPRINT1("VfatLockOrUnlockVolume(%p, %d)\n", IrpContext, Lock);
+
+    DeviceExt = IrpContext->DeviceExt;
+    FileObject = IrpContext->FileObject;
+
+    /* Only allow locking with the volume open */
+    if (FileObject->FsContext != DeviceExt->VolumeFcb)
+    {
+        return STATUS_ACCESS_DENIED;
+    }
+
+    /* Bail out if it's already in the demanded state */
+    if (((DeviceExt->Flags & VCB_VOLUME_LOCKED) && Lock) ||
+        (!(DeviceExt->Flags & VCB_VOLUME_LOCKED) && !Lock))
+    {
+        return STATUS_ACCESS_DENIED;
+    }
+
+    /* Deny locking if we're not alone */
+    if (Lock && DeviceExt->OpenHandleCount != 1)
+    {
+        return STATUS_ACCESS_DENIED;
+    }
+
+    /* Finally, proceed */
+    if (Lock)
+    {
+        DeviceExt->Flags |= VCB_VOLUME_LOCKED;
+    }
+    else
+    {
+        DeviceExt->Flags &= ~VCB_VOLUME_LOCKED;
+    }
+
+    return STATUS_SUCCESS;
+}
+
+static
+NTSTATUS
+VfatDismountVolume(
+    PVFAT_IRP_CONTEXT IrpContext)
+{
+    PDEVICE_EXTENSION DeviceExt;
+
+    DPRINT1("VfatDismountVolume(%p)\n", IrpContext);
+
+    DeviceExt = IrpContext->DeviceExt;
+
+    if (!(DeviceExt->Flags & VCB_VOLUME_LOCKED))
+    {
+        return STATUS_ACCESS_DENIED;
+    }
+
+    UNIMPLEMENTED;
+    return STATUS_NOT_IMPLEMENTED;
+}
+
 /*
  * FUNCTION: File system control
  */
@@ -896,6 +964,18 @@
 
                 case FSCTL_MARK_VOLUME_DIRTY:
                     Status = VfatMarkVolumeDirty(IrpContext);
+                    break;
+
+                case FSCTL_LOCK_VOLUME:
+                    Status = VfatLockOrUnlockVolume(IrpContext, TRUE);
+                    break;
+
+                case FSCTL_UNLOCK_VOLUME:
+                    Status = VfatLockOrUnlockVolume(IrpContext, FALSE);
+                    break;
+
+                case FSCTL_DISMOUNT_VOLUME:
+                    Status = VfatDismountVolume(IrpContext);
                     break;
 
                 default:

Modified: trunk/reactos/drivers/filesystems/fastfat/vfat.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/vfat.h	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/vfat.h	[iso-8859-1] Thu Oct 30 20:56:40
2014
@@ -296,6 +296,9 @@
     /* Notifications */
     LIST_ENTRY NotifyList;
     PNOTIFY_SYNC NotifySync;
+
+    /* Incremented on IRP_MJ_CREATE, decremented on IRP_MJ_CLEANUP */
+    ULONG OpenHandleCount;
 } DEVICE_EXTENSION, VCB, *PVCB;
 
 typedef struct