[tthompson] 75170: [NTFS] - Fix IncreaseMftSize(); check IrpContext to see if waiting for exclusive access to the MFT is allowed. As pointed out by Pierre.
23 Jun
2017
23 Jun
'17
5:30 p.m.
Author: tthompson
Date: Fri Jun 23 17:30:13 2017
New Revision: 75170
URL: http://svn.reactos.org/svn/reactos?rev=75170&view=rev
Log:
[NTFS] - Fix IncreaseMftSize(); check IrpContext to see if waiting for exclusive access to
the MFT is allowed. As pointed out by Pierre.
Modified:
branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/create.c
branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c
branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h
Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/create.c
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/create.c [iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/create.c [iso-8859-1] Fri Jun 23
17:30:13 2017
@@ -323,7 +323,7 @@
static
NTSTATUS
NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
- PIRP Irp)
+ PNTFS_IRP_CONTEXT IrpContext)
{
PDEVICE_EXTENSION DeviceExt;
PIO_STACK_LOCATION Stack;
@@ -334,8 +334,9 @@
// PWSTR FileName;
NTSTATUS Status;
UNICODE_STRING FullPath;
-
- DPRINT1("NtfsCreateFile(%p, %p) called\n", DeviceObject, Irp);
+ PIRP Irp = IrpContext->Irp;
+
+ DPRINT1("NtfsCreateFile(%p, %p) called\n", DeviceObject, IrpContext);
DeviceExt = DeviceObject->DeviceExtension;
ASSERT(DeviceExt);
@@ -561,7 +562,7 @@
}
// Create the file record on disk
- Status = NtfsCreateFileRecord(DeviceExt, FileObject);
+ Status = NtfsCreateFileRecord(DeviceExt, FileObject,
BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT));
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't create file record!\n");
@@ -569,7 +570,7 @@
}
// Now we should be able to open the file
- return NtfsCreateFile(DeviceObject, Irp);
+ return NtfsCreateFile(DeviceObject, IrpContext);
}
}
@@ -615,7 +616,7 @@
ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
TRUE);
Status = NtfsCreateFile(DeviceObject,
- IrpContext->Irp);
+ IrpContext);
ExReleaseResourceLite(&DeviceExt->DirResource);
return Status;
@@ -634,13 +635,20 @@
* @param FileObject
* Pointer to a FILE_OBJECT describing the file to be created
*
+* @param CanWait
+* Boolean indicating if the function is allowed to wait for exclusive access to the
master file table.
+* This will only be relevant if the MFT doesn't have any free file records and needs
to be enlarged.
+*
* @return
* STATUS_SUCCESS on success.
* STATUS_INSUFFICIENT_RESOURCES if unable to allocate memory for the file record.
+* STATUS_CANT_WAIT if CanWait was FALSE and the function needed to resize the MFT but
+* couldn't get immediate, exclusive access to it.
*/
NTSTATUS
NtfsCreateFileRecord(PDEVICE_EXTENSION DeviceExt,
- PFILE_OBJECT FileObject)
+ PFILE_OBJECT FileObject,
+ BOOLEAN CanWait)
{
NTSTATUS Status = STATUS_SUCCESS;
PFILE_RECORD_HEADER FileRecord;
@@ -649,7 +657,7 @@
ULONGLONG ParentMftIndex;
ULONGLONG FileMftIndex;
- DPRINT1("NtfsCreateFileRecord(%p, %p)\n", DeviceExt, FileObject);
+ DPRINT1("NtfsCreateFileRecord(%p, %p, %s)\n", DeviceExt, FileObject,
CanWait ? "TRUE" : "FALSE");
// allocate memory for file record
FileRecord = ExAllocatePoolWithTag(NonPagedPool,
@@ -708,7 +716,7 @@
NtfsDumpFileRecord(DeviceExt, FileRecord);
// Now that we've built the file record in memory, we need to store it in the
MFT.
- Status = AddNewMftEntry(FileRecord, DeviceExt, &FileMftIndex);
+ Status = AddNewMftEntry(FileRecord, DeviceExt, &FileMftIndex, CanWait);
if (NT_SUCCESS(Status))
{
// The highest 2 bytes should be the sequence number, unless the parent happens
to be root
Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c [iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c [iso-8859-1] Fri Jun 23
17:30:13 2017
@@ -195,10 +195,16 @@
* @param Vcb
* Pointer to the VCB (DEVICE_EXTENSION) of the target volume.
*
+*
+* @param CanWait
+* Boolean indicating if the function is allowed to wait for exclusive access to the
master file table.
+* This will only be relevant if the MFT doesn't have any free file records and needs
to be enlarged.
+*
* @return
* STATUS_SUCCESS on success.
* STATUS_INSUFFICIENT_RESOURCES if an allocation fails.
* STATUS_INVALID_PARAMETER if there was an error reading the Mft's bitmap.
+* STATUS_CANT_WAIT if CanWait was FALSE and the function could not get immediate,
exclusive access to the MFT.
*
* @remarks
* Increases the size of the Master File Table by 8 records. Bitmap entries for the new
records are cleared,
@@ -206,7 +212,7 @@
* This function will wait for exlusive access to the volume fcb.
*/
NTSTATUS
-IncreaseMftSize(PDEVICE_EXTENSION Vcb)
+IncreaseMftSize(PDEVICE_EXTENSION Vcb, BOOLEAN CanWait)
{
PNTFS_ATTR_CONTEXT BitmapContext;
LARGE_INTEGER BitmapSize;
@@ -221,10 +227,10 @@
ULONG LengthWritten;
NTSTATUS Status;
- DPRINT1("IncreaseMftSize(%p)\n", Vcb);
+ DPRINT1("IncreaseMftSize(%p, %s)\n", Vcb, CanWait ? "TRUE" :
"FALSE");
// We need exclusive access to the mft while we change its size
- if (!ExAcquireResourceExclusiveLite(&(Vcb->DirResource), TRUE))
+ if (!ExAcquireResourceExclusiveLite(&(Vcb->DirResource), CanWait))
{
return STATUS_CANT_WAIT;
}
@@ -1638,17 +1644,22 @@
* @param DestinationIndex
* Pointer to a ULONGLONG which will receive the MFT index where the file record was
stored.
*
+* @param CanWait
+* Boolean indicating if the function is allowed to wait for exclusive access to the
master file table.
+* This will only be relevant if the MFT doesn't have any free file records and needs
to be enlarged.
+*
* @return
* STATUS_SUCCESS on success.
* STATUS_OBJECT_NAME_NOT_FOUND if we can't find the MFT's $Bitmap or if we
weren't able
* to read the attribute.
* STATUS_INSUFFICIENT_RESOURCES if we can't allocate enough memory for a copy of
$Bitmap.
-*
+* STATUS_CANT_WAIT if CanWait was FALSE and the function could not get immediate,
exclusive access to the MFT.
*/
NTSTATUS
AddNewMftEntry(PFILE_RECORD_HEADER FileRecord,
PDEVICE_EXTENSION DeviceExt,
- PULONGLONG DestinationIndex)
+ PULONGLONG DestinationIndex,
+ BOOLEAN CanWait)
{
NTSTATUS Status = STATUS_SUCCESS;
ULONGLONG MftIndex;
@@ -1661,7 +1672,7 @@
LARGE_INTEGER BitmapBits;
UCHAR SystemReservedBits;
- DPRINT1("AddNewMftEntry(%p, %p, %p)\n", FileRecord, DeviceExt,
DestinationIndex);
+ DPRINT1("AddNewMftEntry(%p, %p, %p, %s)\n", FileRecord, DeviceExt,
DestinationIndex, CanWait ? "TRUE" : "FALSE");
// First, we have to read the mft's $Bitmap attribute
Status = FindAttribute(DeviceExt, DeviceExt->MasterFileTable, AttributeBitmap,
L"", 0, &BitmapContext, NULL);
@@ -1717,14 +1728,14 @@
ReleaseAttributeContext(BitmapContext);
// Couldn't find a free record in the MFT, add some blank records and try
again
- Status = IncreaseMftSize(DeviceExt);
+ Status = IncreaseMftSize(DeviceExt, CanWait);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Couldn't find space in MFT for file or increase MFT
size!\n");
return Status;
}
- return AddNewMftEntry(FileRecord, DeviceExt, DestinationIndex);
+ return AddNewMftEntry(FileRecord, DeviceExt, DestinationIndex, CanWait);
}
DPRINT1("Creating file record at MFT index: %I64u\n", MftIndex);
Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h [iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h [iso-8859-1] Fri Jun 23
17:30:13 2017
@@ -667,7 +667,8 @@
NTSTATUS
NtfsCreateFileRecord(PDEVICE_EXTENSION DeviceExt,
- PFILE_OBJECT FileObject);
+ PFILE_OBJECT FileObject,
+ BOOLEAN CanWait);
/* devctl.c */
@@ -825,7 +826,8 @@
NTSTATUS
AddNewMftEntry(PFILE_RECORD_HEADER FileRecord,
PDEVICE_EXTENSION DeviceExt,
- PULONGLONG DestinationIndex);
+ PULONGLONG DestinationIndex,
+ BOOLEAN CanWait);
PNTFS_ATTR_CONTEXT
PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord);
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