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[NTFS] - Fix IncreaseMftSize(); check IrpContext to see if waiting for exclusive access to the MFT is allowed. As pointed out by Pierre.

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svn path=/branches/GSoC_2016/NTFS/; revision=75170
This commit is contained in:
Trevor Thompson 2017-06-23 17:30:13 +00:00 • committed by Thomas Faber
parent 9ab86116a9
commit 98ddf610bc
3 changed files with 39 additions and 18 deletions
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24
drivers/filesystems/ntfs/create.c
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@ -323,7 +323,7 @@ NtfsOpenFile(PDEVICE_EXTENSION DeviceExt,
static
NTSTATUS
NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
PIRP Irp)
PNTFS_IRP_CONTEXT IrpContext)
{
PDEVICE_EXTENSION DeviceExt;
PIO_STACK_LOCATION Stack;
@ -334,8 +334,9 @@ NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
// PWSTR FileName;
NTSTATUS Status;
UNICODE_STRING FullPath;
PIRP Irp = IrpContext->Irp;
DPRINT1("NtfsCreateFile(%p, %p) called\n", DeviceObject, Irp);
DPRINT1("NtfsCreateFile(%p, %p) called\n", DeviceObject, IrpContext);
DeviceExt = DeviceObject->DeviceExtension;
ASSERT(DeviceExt);
@ -561,7 +562,7 @@ NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
}
// 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 @@ NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
}
// Now we should be able to open the file
return NtfsCreateFile(DeviceObject, Irp);
return NtfsCreateFile(DeviceObject, IrpContext);
}
}
@ -615,7 +616,7 @@ NtfsCreate(PNTFS_IRP_CONTEXT IrpContext)
ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
TRUE);
Status = NtfsCreateFile(DeviceObject,
IrpContext->Irp);
IrpContext);
ExReleaseResourceLite(&DeviceExt->DirResource);
return Status;
@ -634,13 +635,20 @@ NtfsCreate(PNTFS_IRP_CONTEXT IrpContext)
* @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 @@ NtfsCreateFileRecord(PDEVICE_EXTENSION DeviceExt,
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 @@ NtfsCreateFileRecord(PDEVICE_EXTENSION DeviceExt,
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