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sys: fsctl

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This commit is contained in:
Bill Zissimopoulos 2015-12-21 16:09:54 -08:00
parent 68eefd9e24
commit b5bd03df30
1 changed files with 19 additions and 28 deletions
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47
src/sys/fsctl.c
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@ -37,6 +37,19 @@ FSP_DRIVER_DISPATCH FspFileSystemControl;
#pragma alloc_text(PAGE, FspFileSystemControl)
#endif
static inline PDEVICE_OBJECT FspFsvolDeviceObjectFromFileObject(PFILE_OBJECT FileObject)
{
PDEVICE_OBJECT FsvolDeviceObject;
FSP_FSCTL_FILE_CONTEXT2 *FsContext2 = FileObject->FsContext2;
ExAcquireFastMutex(&FsContext2->FastMutex);
FsvolDeviceObject = FsContext2->FsvolDeviceObject;
ExReleaseFastMutex(&FsContext2->FastMutex);
/* no FspDeviceRetain on the volume device, because it exists until the FileObject IRP_MJ_CLEANUP */
return FsvolDeviceObject;
}
static NTSTATUS FspFsctlFileSystemControl(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
{
@ -249,15 +262,10 @@ VOID FspFsctlDeleteVolume(
/* performed during IRP_MJ_CLEANUP! */
PAGED_CODE();
FSP_FSCTL_FILE_CONTEXT2 *FsContext2 = IrpSp->FileObject->FsContext2;
PDEVICE_OBJECT FsvolDeviceObject = 0;
PDEVICE_OBJECT FsvolDeviceObject;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension;
/*
* Check to see if we have a volume. There is no need to protect this
* access in FsContext2->FastMutex, because we are called during IRP_MJ_CLEANUP.
*/
FsvolDeviceObject = FsContext2->FsvolDeviceObject;
FsvolDeviceObject = FspFsvolDeviceObjectFromFileObject(IrpSp->FileObject);
if (0 == FsvolDeviceObject)
return;
FsvolDeviceExtension = FspFsvolDeviceExtension(FsvolDeviceObject);
@ -384,8 +392,7 @@ static NTSTATUS FspFsctlTransact(
return STATUS_BUFFER_TOO_SMALL;
NTSTATUS Result;
FSP_FSCTL_FILE_CONTEXT2 *FsContext2;
PDEVICE_OBJECT FsvolDeviceObject = 0;
PDEVICE_OBJECT FsvolDeviceObject;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension;
PVOID MdlBuffer;
PUINT8 BufferEnd;
@ -394,25 +401,9 @@ static NTSTATUS FspFsctlTransact(
PIRP ProcessIrp, PendingIrp;
LARGE_INTEGER Timeout;
Result = STATUS_SUCCESS;
FsContext2 = IrpSp->FileObject->FsContext2;
ExAcquireFastMutex(&FsContext2->FastMutex);
try
{
/* check to see if we already have a volume */
FsvolDeviceObject = FsContext2->FsvolDeviceObject;
if (0 == FsvolDeviceObject)
Result = STATUS_ACCESS_DENIED;
/* no need to FspDeviceRetain our volume device, because it exists until IRP_MJ_CLEANUP */
}
finally
{
ExReleaseFastMutex(&FsContext2->FastMutex);
}
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceObject = FspFsvolDeviceObjectFromFileObject(IrpSp->FileObject);
if (0 == FsvolDeviceObject)
return STATUS_ACCESS_DENIED;
FsvolDeviceExtension = FspFsvolDeviceExtension(FsvolDeviceObject);
/* process any user-mode file system responses */