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[FASTFAT] Improvements for volume dismount + minor bugfixing.

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- Cache the RootFcb so that its cleanup can be handled separately
  during dismounting.

- Force volume dismount at cleanup if the VCB_DISMOUNT_PENDING flag
  is set.

- Actually dismount a volume if its VCB has been flagged as not good,
  or if we force dismounting.

NOTE: In their *CheckForDismount() function, our 3rd-party FS drivers
as well as MS' fastfat, perform a comparison check of the current VCB's
VPB ReferenceCount with some sort of "dangling"/"residual" open count.
It seems to be related to the fact that the volume root directory as
well as auxiliary data stream(s) are still opened, and only these are
allowed to be opened at that moment. After analysis it appears that for
the ReactOS' fastfat, this number is equal to "3".

- On dismounting, cleanup and destroy the RootFcb, VolumeFcb and the
  FATFileObject. Then cleanup the SpareVPB or the IoVPB members, and
  finish by removing the dismounted volume from the VolumeListEntry
  and cleaning up the notify synchronization object and the resources.

- During dismounting, and on shutdown, flush the volume before
  resetting its dirty bit.

- On shutdown, after volume flushing, try to unmount it without forcing.

- Release the VCB resources only when we actually dismount the volume
  in VfatCheckForDismount().

- Initialize first the notify list and the synchronization object,
  before sending the FSRTL_VOLUME_MOUNT notification.

- If we failed at mounting a volume but its VCB's FATFileObject was
  already initialized, first call CcUninitializeCacheMap() on it
  before dereferencing it.

- Send FSRTL_VOLUME_LOCK, FSRTL_VOLUME_LOCK_FAILED and
  FSRTL_VOLUME_UNLOCK notifications during volume locking (and failure)
  and volume unlocking.

- Flush the volume before locking it, and clean its dirty bit if needed.

NOTE: In addition to checking for VCB_CLEAR_DIRTY, we also check for the
presence of the VCB_IS_DIRTY flag before cleaning up the dirty bit: this
allows us to not re-clean the bit if it has been previously cleaned.
This is needed for instance in this scenario:
- The volume is locked (it gets flushed and the dirty bit is possibly cleared);
- The volume then gets formatted with a completely different FS, that
  possibly clears up the first sector (e.g. BTRFS ignores 1st sector);
- The volume is then dismounted: if we didn't check whether VCB_IS_DIRTY
  was set prior to resetting it, we could attempt clearing it again! But
  now that the volume's filesystem has been completely changed, we would
  then try to modify the dirty bit on an erroneous position on disk!
  That's why it should not be touched in this case during dismounting.
- The volume is unlocked (same comment as above), and later can be
  detected as being BTRFS.
This commit is contained in:
Hermès Bélusca-Maïto 2018-11-11 17:17:48 +01:00 committed by Pierre Schweitzer
parent 2410eef6d2
commit b77824a375
9 changed files with 220 additions and 81 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/filesystems/fastfat/cleanup.c
View file

@ -161,7 +161,7 @@ VfatCleanupFile(
#ifdef ENABLE_SWAPOUT
if (IsVolume && BooleanFlagOn(DeviceExt->Flags, VCB_DISMOUNT_PENDING))
{
VfatCheckForDismount(DeviceExt, FALSE);
VfatCheckForDismount(DeviceExt, TRUE);
}
#endif

4
drivers/filesystems/fastfat/close.c
View file

@ -21,8 +21,8 @@ VfatCommonCloseFile(
PDEVICE_EXTENSION DeviceExt,
PVFATFCB pFcb)
{
/* Nothing to do for volumes */
if (BooleanFlagOn(pFcb->Flags, FCB_IS_VOLUME))
/* Nothing to do for volumes or for the FAT file object */
if (BooleanFlagOn(pFcb->Flags, FCB_IS_FAT | FCB_IS_VOLUME))
{
return;
}

6
drivers/filesystems/fastfat/fat.c
View file

@ -20,12 +20,6 @@
#define CACHEPAGESIZE(pDeviceExt) ((pDeviceExt)->FatInfo.BytesPerCluster > PAGE_SIZE ? \
(pDeviceExt)->FatInfo.BytesPerCluster : PAGE_SIZE)
/* FIXME: because volume is not cached, we have to perform direct IOs
* The day this is fixed, just comment out that line, and check
* it still works (and delete old code ;-))
*/
#define VOLUME_IS_NOT_CACHED_WORK_AROUND_IT
/* FUNCTIONS ****************************************************************/
/*

20
drivers/filesystems/fastfat/fcb.c
View file

@ -277,6 +277,7 @@ vfatDestroyFCB(
#endif
FsRtlUninitializeFileLock(&pFCB->FileLock);
if (!vfatFCBIsRoot(pFCB) &&
!BooleanFlagOn(pFCB->Flags, FCB_IS_FAT) && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME))
{
@ -317,11 +318,15 @@ _vfatGrabFCB(
{
DPRINT1("Inc ref count (%d, oc: %d) for: %p (%wZ) at: %s(%d) %s\n", pFCB->RefCount, pFCB->OpenHandleCount, pFCB, &pFCB->PathNameU, File, Line, Func);
}
#else
DPRINT("Grabbing FCB at %p: %wZ, refCount:%d\n",
pFCB, &pFCB->PathNameU, pFCB->RefCount);
#endif
ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
ASSERT(pFCB != pVCB->VolumeFcb);
ASSERT(!BooleanFlagOn(pFCB->Flags, FCB_IS_FAT));
ASSERT(pFCB != pVCB->VolumeFcb && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME));
ASSERT(pFCB->RefCount > 0);
++pFCB->RefCount;
}
@ -350,7 +355,7 @@ _vfatReleaseFCB(
DPRINT1("Dec ref count (%d, oc: %d) for: %p (%wZ) at: %s(%d) %s\n", pFCB->RefCount, pFCB->OpenHandleCount, pFCB, &pFCB->PathNameU, File, Line, Func);
}
#else
DPRINT("releasing FCB at %p: %wZ, refCount:%d\n",
DPRINT("Releasing FCB at %p: %wZ, refCount:%d\n",
pFCB, &pFCB->PathNameU, pFCB->RefCount);
#endif
@ -360,7 +365,8 @@ _vfatReleaseFCB(
{
ULONG RefCount;
ASSERT(pFCB != pVCB->VolumeFcb);
ASSERT(!BooleanFlagOn(pFCB->Flags, FCB_IS_FAT));
ASSERT(pFCB != pVCB->VolumeFcb && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME));
ASSERT(pFCB->RefCount > 0);
RefCount = --pFCB->RefCount;
@ -647,6 +653,8 @@ vfatMakeRootFCB(
NTSTATUS Status = STATUS_SUCCESS;
UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
ASSERT(pVCB->RootFcb == NULL);
FCB = vfatNewFCB(pVCB, &NameU);
if (vfatVolumeIsFatX(pVCB))
{
@ -690,6 +698,9 @@ vfatMakeRootFCB(
vfatFCBInitializeCacheFromVolume(pVCB, FCB);
vfatAddFCBToTable(pVCB, FCB);
/* Cache it */
pVCB->RootFcb = FCB;
return FCB;
}
@ -705,6 +716,7 @@ vfatOpenRootFCB(
{
FCB = vfatMakeRootFCB(pVCB);
}
ASSERT(FCB == pVCB->RootFcb);
return FCB;
}
@ -747,8 +759,6 @@ vfatAttachFCBToFileObject(
{
PVFATCCB newCCB;
UNREFERENCED_PARAMETER(vcb);
#ifdef KDBG
if (DebugFile.Buffer != NULL && FsRtlIsNameInExpression(&DebugFile, &fcb->LongNameU, FALSE, NULL))
{

4
drivers/filesystems/fastfat/flush.c
View file

@ -59,7 +59,9 @@ VfatFlushVolume(
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
DPRINT("VfatFlushVolume(DeviceExt %p, FatFcb %p)\n", DeviceExt, VolumeFcb);
DPRINT("VfatFlushVolume(DeviceExt %p, VolumeFcb %p)\n", DeviceExt, VolumeFcb);
ASSERT(VolumeFcb == DeviceExt->VolumeFcb);
ListEntry = DeviceExt->FcbListHead.Flink;
while (ListEntry != &DeviceExt->FcbListHead)

92
drivers/filesystems/fastfat/fsctl.c
View file

@ -531,7 +531,6 @@ VfatMount(
NTSTATUS Status;
PVFATFCB Fcb = NULL;
PVFATFCB VolumeFcb = NULL;
PVFATCCB Ccb = NULL;
PDEVICE_OBJECT DeviceToMount;
PVPB Vpb;
UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\$$Fat$$");
@ -706,23 +705,14 @@ VfatMount(
goto ByeBye;
}
Ccb = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
if (Ccb == NULL)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
Status = vfatAttachFCBToFileObject(DeviceExt, Fcb, DeviceExt->FATFileObject);
if (!NT_SUCCESS(Status))
goto ByeBye;
}
RtlZeroMemory(Ccb, sizeof (VFATCCB));
DeviceExt->FATFileObject->FsContext = Fcb;
DeviceExt->FATFileObject->FsContext2 = Ccb;
DeviceExt->FATFileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
DeviceExt->FATFileObject->PrivateCacheMap = NULL;
DeviceExt->FATFileObject->Vpb = DeviceObject->Vpb;
Fcb->FileObject = DeviceExt->FATFileObject;
Fcb->Flags |= FCB_IS_FAT;
Fcb->Flags = FCB_IS_FAT;
Fcb->RFCB.FileSize.QuadPart = DeviceExt->FatInfo.FATSectors * DeviceExt->FatInfo.BytesPerSector;
Fcb->RFCB.ValidDataLength = Fcb->RFCB.FileSize;
Fcb->RFCB.AllocationSize = Fcb->RFCB.FileSize;
@ -798,9 +788,15 @@ VfatMount(
SetFlag(DeviceExt->Flags, VCB_IS_SYS_OR_HAS_PAGE);
}
FsRtlNotifyVolumeEvent(DeviceExt->FATFileObject, FSRTL_VOLUME_MOUNT);
FsRtlNotifyInitializeSync(&DeviceExt->NotifySync);
/* Initialize the notify list and synchronization object */
InitializeListHead(&DeviceExt->NotifyList);
FsRtlNotifyInitializeSync(&DeviceExt->NotifySync);
/* The VCB is OK for usage */
SetFlag(DeviceExt->Flags, VCB_GOOD);
/* Send the mount notification */
FsRtlNotifyVolumeEvent(DeviceExt->FATFileObject, FSRTL_VOLUME_MOUNT);
DPRINT("Mount success\n");
@ -811,15 +807,24 @@ ByeBye:
{
/* Cleanup */
if (DeviceExt && DeviceExt->FATFileObject)
ObDereferenceObject (DeviceExt->FATFileObject);
{
LARGE_INTEGER Zero = {{0,0}};
PVFATCCB Ccb = (PVFATCCB)DeviceExt->FATFileObject->FsContext2;
CcUninitializeCacheMap(DeviceExt->FATFileObject,
&Zero,
NULL);
ObDereferenceObject(DeviceExt->FATFileObject);
if (Ccb)
vfatDestroyCCB(Ccb);
DeviceExt->FATFileObject = NULL;
}
if (Fcb)
vfatDestroyFCB(Fcb);
if (DeviceExt && DeviceExt->SpareVPB)
ExFreePoolWithTag(DeviceExt->SpareVPB, TAG_VPB);
if (DeviceExt && DeviceExt->Statistics)
ExFreePoolWithTag(DeviceExt->Statistics, TAG_STATS);
if (Fcb)
vfatDestroyFCB(Fcb);
if (Ccb)
vfatDestroyCCB(Ccb);
if (DeviceObject)
IoDeleteDevice(DeviceObject);
}
@ -1125,6 +1130,11 @@ VfatLockOrUnlockVolume(
return STATUS_ACCESS_DENIED;
}
if (Lock)
{
FsRtlNotifyVolumeEvent(IrpContext->Stack->FileObject, FSRTL_VOLUME_LOCK);
}
/* Deny locking if we're not alone */
if (Lock && DeviceExt->OpenHandleCount != 1)
{
@ -1208,6 +1218,8 @@ VfatLockOrUnlockVolume(
}
}
FsRtlNotifyVolumeEvent(IrpContext->Stack->FileObject, FSRTL_VOLUME_LOCK_FAILED);
return STATUS_ACCESS_DENIED;
#if 1
@ -1225,6 +1237,18 @@ VfatLockOrUnlockVolume(
/* Finally, proceed */
if (Lock)
{
/* Flush volume & files */
VfatFlushVolume(DeviceExt, DeviceExt->VolumeFcb);
/* The volume is now clean */
if (BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_CLEAR_DIRTY) &&
BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_IS_DIRTY))
{
/* Drop the dirty bit */
if (NT_SUCCESS(SetDirtyStatus(DeviceExt, FALSE)))
ClearFlag(DeviceExt->VolumeFcb->Flags, VCB_IS_DIRTY);
}
DeviceExt->Flags |= VCB_VOLUME_LOCKED;
Vpb->Flags |= VPB_LOCKED;
}
@ -1232,6 +1256,8 @@ VfatLockOrUnlockVolume(
{
DeviceExt->Flags &= ~VCB_VOLUME_LOCKED;
Vpb->Flags &= ~VPB_LOCKED;
FsRtlNotifyVolumeEvent(IrpContext->Stack->FileObject, FSRTL_VOLUME_UNLOCK);
}
return STATUS_SUCCESS;
@ -1277,25 +1303,35 @@ VfatDismountVolume(
ExAcquireResourceExclusiveLite(&DeviceExt->FatResource, TRUE);
/* We're performing a clean shutdown */
if (BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_CLEAR_DIRTY))
/* Flush volume & files */
VfatFlushVolume(DeviceExt, (PVFATFCB)FileObject->FsContext);
/* The volume is now clean */
if (BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_CLEAR_DIRTY) &&
BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_IS_DIRTY))
{
/* Drop the dirty bit */
if (NT_SUCCESS(SetDirtyStatus(DeviceExt, FALSE)))
DeviceExt->VolumeFcb->Flags &= ~VCB_IS_DIRTY;
}
/* Flush volume & files */
VfatFlushVolume(DeviceExt, (PVFATFCB)FileObject->FsContext);
/* Rebrowse the FCB in order to free them now */
while (!IsListEmpty(&DeviceExt->FcbListHead))
{
NextEntry = RemoveTailList(&DeviceExt->FcbListHead);
Fcb = CONTAINING_RECORD(NextEntry, VFATFCB, FcbListEntry);
if (Fcb == DeviceExt->RootFcb)
DeviceExt->RootFcb = NULL;
else if (Fcb == DeviceExt->VolumeFcb)
DeviceExt->VolumeFcb = NULL;
vfatDestroyFCB(Fcb);
}
/* We are uninitializing, the VCB cannot be used anymore */
ClearFlag(DeviceExt->Flags, VCB_GOOD);
/* Mark we're being dismounted */
DeviceExt->Flags |= VCB_DISMOUNT_PENDING;
#ifndef ENABLE_SWAPOUT
@ -1304,12 +1340,6 @@ VfatDismountVolume(
ExReleaseResourceLite(&DeviceExt->FatResource);
/* Release a few resources and quit, we're done */
ExFreePoolWithTag(DeviceExt->Statistics, TAG_STATS);
ExDeleteResourceLite(&DeviceExt->DirResource);
ExDeleteResourceLite(&DeviceExt->FatResource);
ObDereferenceObject(DeviceExt->FATFileObject);
return STATUS_SUCCESS;
}

141
drivers/filesystems/fastfat/misc.c
View file

@ -416,23 +416,43 @@ VfatLockUserBuffer(
BOOLEAN
VfatCheckForDismount(
IN PDEVICE_EXTENSION DeviceExt,
IN BOOLEAN Create)
IN BOOLEAN Force)
{
KIRQL OldIrql;
ULONG UnCleanCount;
PVPB Vpb;
BOOLEAN Delete;
DPRINT1("VfatCheckForDismount(%p, %u)\n", DeviceExt, Create);
DPRINT1("VfatCheckForDismount(%p, %u)\n", DeviceExt, Force);
/* If the VCB is OK (not under uninitialization) and we don't force dismount, do nothing */
if (BooleanFlagOn(DeviceExt->Flags, VCB_GOOD) && !Force)
{
return FALSE;
}
/*
* NOTE: In their *CheckForDismount() function, our 3rd-party FS drivers
* as well as MS' fastfat, perform a comparison check of the current VCB's
* VPB ReferenceCount with some sort of "dangling"/"residual" open count,
* depending on whether or not we are in IRP_MJ_CREATE.
* It seems to be related to the fact that the volume root directory as
* well as auxiliary data stream(s) are still opened, and only these are
* allowed to be opened at that moment. After analysis it appears that for
* the ReactOS' fastfat, this number is equal to "3".
*/
UnCleanCount = 3;
/* Lock VPB */
IoAcquireVpbSpinLock(&OldIrql);
/* Reference it and check if a create is being done */
Vpb = DeviceExt->IoVPB;
if (Vpb->ReferenceCount != Create)
DPRINT("Vpb->ReferenceCount = %d\n", Vpb->ReferenceCount);
if (Vpb->ReferenceCount != UnCleanCount || DeviceExt->OpenHandleCount != 0)
{
/* Copy the VPB to our local own to prepare later dismount */
if (DeviceExt->SpareVPB != NULL)
/* If we force-unmount, copy the VPB to our local own to prepare later dismount */
if (Force && Vpb->RealDevice->Vpb == Vpb && DeviceExt->SpareVPB != NULL)
{
RtlZeroMemory(DeviceExt->SpareVPB, sizeof(VPB));
DeviceExt->SpareVPB->Type = IO_TYPE_VPB;
@ -443,9 +463,12 @@ VfatCheckForDismount(
DeviceExt->IoVPB->RealDevice->Vpb = DeviceExt->SpareVPB;
DeviceExt->SpareVPB = NULL;
DeviceExt->IoVPB->Flags |= VPB_PERSISTENT;
/* We are uninitializing, the VCB cannot be used anymore */
ClearFlag(DeviceExt->Flags, VCB_GOOD);
}
/* Don't do anything */
/* Don't do anything for now */
Delete = FALSE;
}
else
@ -453,12 +476,30 @@ VfatCheckForDismount(
/* Otherwise, delete the volume */
Delete = TRUE;
/* Check if it has a VPB and unmount it */
if (Vpb->RealDevice->Vpb == Vpb)
/* Swap the VPB with our local own */
if (Vpb->RealDevice->Vpb == Vpb && DeviceExt->SpareVPB != NULL)
{
Vpb->DeviceObject = NULL;
Vpb->Flags &= ~VPB_MOUNTED;
RtlZeroMemory(DeviceExt->SpareVPB, sizeof(VPB));
DeviceExt->SpareVPB->Type = IO_TYPE_VPB;
DeviceExt->SpareVPB->Size = sizeof(VPB);
DeviceExt->SpareVPB->RealDevice = DeviceExt->IoVPB->RealDevice;
DeviceExt->SpareVPB->DeviceObject = NULL;
DeviceExt->SpareVPB->Flags = DeviceExt->IoVPB->Flags & VPB_REMOVE_PENDING;
DeviceExt->IoVPB->RealDevice->Vpb = DeviceExt->SpareVPB;
DeviceExt->SpareVPB = NULL;
DeviceExt->IoVPB->Flags |= VPB_PERSISTENT;
/* We are uninitializing, the VCB cannot be used anymore */
ClearFlag(DeviceExt->Flags, VCB_GOOD);
}
/*
* We defer setting the VPB's DeviceObject to NULL for later because
* we want to handle the closing of the internal opened meta-files.
*/
/* Clear the mounted and locked flags in the VPB */
ClearFlag(Vpb->Flags, VPB_MOUNTED | VPB_LOCKED);
}
/* Release lock and return status */
@ -467,34 +508,82 @@ VfatCheckForDismount(
/* If we were to delete, delete volume */
if (Delete)
{
PVPB DelVpb;
LARGE_INTEGER Zero = {{0,0}};
PVFATFCB Fcb;
/* We are uninitializing, the VCB cannot be used anymore */
ClearFlag(DeviceExt->Flags, VCB_GOOD);
/* Invalidate and close the internal opened meta-files */
if (DeviceExt->RootFcb)
{
Fcb = DeviceExt->RootFcb;
CcUninitializeCacheMap(Fcb->FileObject,
&Zero,
NULL);
ObDereferenceObject(Fcb->FileObject);
DeviceExt->RootFcb = NULL;
vfatDestroyFCB(Fcb);
}
if (DeviceExt->VolumeFcb)
{
Fcb = DeviceExt->VolumeFcb;
#ifndef VOLUME_IS_NOT_CACHED_WORK_AROUND_IT
CcUninitializeCacheMap(Fcb->FileObject,
&Zero,
NULL);
ObDereferenceObject(Fcb->FileObject);
#endif
DeviceExt->VolumeFcb = NULL;
vfatDestroyFCB(Fcb);
}
if (DeviceExt->FATFileObject)
{
Fcb = (PVFATFCB)DeviceExt->FATFileObject->FsContext;
CcUninitializeCacheMap(DeviceExt->FATFileObject,
&Zero,
NULL);
ObDereferenceObject(DeviceExt->FATFileObject);
DeviceExt->FATFileObject->FsContext = NULL;
DeviceExt->FATFileObject = NULL;
vfatDestroyFCB(Fcb);
}
/*
* Now that the closing of the internal opened meta-files has been
* handled, we can now set the VPB's DeviceObject to NULL.
*/
Vpb->DeviceObject = NULL;
/* If we have a local VPB, we'll have to delete it
* but we won't dismount us - something went bad before
*/
if (DeviceExt->SpareVPB)
{
DelVpb = DeviceExt->SpareVPB;
ExFreePool(DeviceExt->SpareVPB);
}
/* Otherwise, dismount our device if possible */
else
/* Otherwise, delete any of the available VPB if its reference count is zero */
else if (DeviceExt->IoVPB->ReferenceCount == 0)
{
if (DeviceExt->IoVPB->ReferenceCount)
{
ObfDereferenceObject(DeviceExt->StorageDevice);
IoDeleteDevice(DeviceExt->VolumeDevice);
return Delete;
}
DelVpb = DeviceExt->IoVPB;
ExFreePool(DeviceExt->IoVPB);
}
/* Delete any of the available VPB and dismount */
ExFreePool(DelVpb);
/* Remove the volume from the list */
ExAcquireResourceExclusiveLite(&VfatGlobalData->VolumeListLock, TRUE);
RemoveEntryList(&DeviceExt->VolumeListEntry);
ExReleaseResourceLite(&VfatGlobalData->VolumeListLock);
/* Uninitialize the notify synchronization object */
FsRtlNotifyUninitializeSync(&DeviceExt->NotifySync);
/* Release resources */
ExFreePoolWithTag(DeviceExt->Statistics, TAG_STATS);
ExDeleteResourceLite(&DeviceExt->DirResource);
ExDeleteResourceLite(&DeviceExt->FatResource);
/* Dismount our device if possible */
ObfDereferenceObject(DeviceExt->StorageDevice);
IoDeleteDevice(DeviceExt->VolumeDevice);
return Delete;
}
return Delete;

17
drivers/filesystems/fastfat/shutdown.c
View file

@ -74,15 +74,19 @@ VfatShutdown(
ListEntry = ListEntry->Flink;
ExAcquireResourceExclusiveLite(&DeviceExt->DirResource, TRUE);
/* It was a clean volume mounted */
if (DeviceExt->VolumeFcb->Flags & VCB_CLEAR_DIRTY)
/* Flush volume & files */
Status = VfatFlushVolume(DeviceExt, DeviceExt->VolumeFcb);
/* We're performing a clean shutdown */
if (BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_CLEAR_DIRTY) &&
BooleanFlagOn(DeviceExt->VolumeFcb->Flags, VCB_IS_DIRTY))
{
/* So, drop the dirty bit we set */
/* Drop the dirty bit */
if (NT_SUCCESS(SetDirtyStatus(DeviceExt, FALSE)))
DeviceExt->VolumeFcb->Flags &= ~VCB_IS_DIRTY;
}
Status = VfatFlushVolume(DeviceExt, DeviceExt->VolumeFcb);
if (NT_SUCCESS(Status))
{
Status = VfatDiskShutDown(DeviceExt);
@ -97,7 +101,10 @@ VfatShutdown(
}
ExReleaseResourceLite(&DeviceExt->DirResource);
/* FIXME: Unmount the logical volume */
/* Unmount the logical volume */
#ifdef ENABLE_SWAPOUT
VfatCheckForDismount(DeviceExt, FALSE);
#endif
if (!NT_SUCCESS(Status))
Irp->IoStatus.Status = Status;

15
drivers/filesystems/fastfat/vfat.h
View file

@ -16,12 +16,16 @@
#define INIT_SECTION /* Done via alloc_text for MSC */
#endif
#define USE_ROS_CC_AND_FS
#if 0
#ifndef _MSC_VER
#define ENABLE_SWAPOUT
#endif
#endif
/* FIXME: because volume is not cached, we have to perform direct IOs
* The day this is fixed, just comment out that line, and check
* it still works (and delete old code ;-))
*/
#define VOLUME_IS_NOT_CACHED_WORK_AROUND_IT
#define ROUND_DOWN(n, align) \
(((ULONG)n) & ~((align) - 1l))
@ -244,6 +248,8 @@ typedef union _DIR_ENTRY DIR_ENTRY, *PDIR_ENTRY;
#define VCB_IS_SYS_OR_HAS_PAGE 0x0008
#define VCB_IS_DIRTY 0x4000 /* Volume is dirty */
#define VCB_CLEAR_DIRTY 0x8000 /* Clean dirty flag at shutdown */
/* VCB condition state */
#define VCB_GOOD 0x0010 /* If not set, the VCB is improper for usage */
typedef struct
{
@ -326,6 +332,7 @@ typedef struct DEVICE_EXTENSION
BOOLEAN AvailableClustersValid;
ULONG Flags;
struct _VFATFCB *VolumeFcb;
struct _VFATFCB *RootFcb;
PSTATISTICS Statistics;
/* Pointers to functions for manipulating FAT. */