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sys: FsContext now maintains reference to its DeviceObject

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This commit is contained in:
Bill Zissimopoulos
2015-12-10 21:31:02 -08:00
parent 140e567fdc
commit de065afe8d
5 changed files with 68 additions and 60 deletions
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84
src/sys/cleanup.c
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@ -50,56 +50,56 @@ static NTSTATUS FspFsvolCleanup(
NTSTATUS Result;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
PDEVICE_OBJECT FsvrtDeviceObject = FsvolDeviceExtension->FsvrtDeviceObject;
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_CONTEXT *FsContext = FileObject->FsContext;
UINT64 UserContext = FsContext->UserContext;
UINT64 UserContext2 = (UINT_PTR)FileObject->FsContext2;
BOOLEAN DeletePending;
LONG OpenCount;
/* lock the FsContext */
ExAcquireResourceExclusiveLite(FsContext->Header.Resource, TRUE);
/* propagate the FsContext DeleteOnClose to DeletePending */
if (FsContext->DeleteOnClose)
FsContext->DeletePending = TRUE;
DeletePending = FsContext->DeletePending;
/* all handles on this FileObject are gone; decrement its FsContext->OpenCount */
OpenCount = FspFileContextClose(FsContext);
/* unlock the FsContext */
ExReleaseResourceLite(FsContext->Header.Resource);
/* is the FsContext going away as well? */
if (0 == OpenCount)
{
/*
* The following must be done under the file system volume device Resource,
* because we are manipulating its GenericTable.
*/
ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->Base.Resource, TRUE);
try
{
/* remove the FsContext from the file system volume device generic table */
FspFsvolDeviceDeleteContext(DeviceObject, FsContext->UserContext, 0);
}
finally
{
ExReleaseResourceLite(&FsvolDeviceExtension->Base.Resource);
}
}
PDEVICE_OBJECT FsvrtDeviceObject = FsvolDeviceExtension->FsvrtDeviceObject;
if (!FspDeviceRetain(FsvrtDeviceObject))
return STATUS_CANCELLED;
try
{
FSP_FSVRT_DEVICE_EXTENSION *FsvrtDeviceExtension =
FspFsvrtDeviceExtension(FsvrtDeviceObject);
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_CONTEXT *FsContext = FileObject->FsContext;
UINT64 UserContext = FsContext->UserContext;
UINT64 UserContext2 = (UINT_PTR)FileObject->FsContext2;
FSP_FSVRT_DEVICE_EXTENSION *FsvrtDeviceExtension = FspFsvrtDeviceExtension(FsvrtDeviceObject);
BOOLEAN FileNameRequired = 0 != FsvrtDeviceExtension->VolumeParams.FileNameRequired;
BOOLEAN DeletePending;
LONG OpenCount;
FSP_FSCTL_TRANSACT_REQ *Request;
/* lock the FsContext */
ExAcquireResourceExclusiveLite(FsContext->Header.Resource, TRUE);
/* propagate the FsContext DeleteOnClose to DeletePending */
if (FsContext->DeleteOnClose)
FsContext->DeletePending = TRUE;
DeletePending = FsContext->DeletePending;
/* all handles on this FileObject are gone; decrement its FsContext->OpenCount */
OpenCount = FspFileContextClose(FsContext);
/* unlock the FsContext */
ExReleaseResourceLite(FsContext->Header.Resource);
/* is the FsContext going away as well? */
if (0 == OpenCount)
{
/*
* The following must be done under the file system volume device Resource,
* because we are manipulating its GenericTable.
*/
ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->Base.Resource, TRUE);
try
{
/* remove the FsContext from the file system volume device generic table */
FspFsvolDeviceDeleteContext(DeviceObject, FsContext->UserContext, 0);
}
finally
{
ExReleaseResourceLite(&FsvolDeviceExtension->Base.Resource);
}
}
/* create the user-mode file system request */
Result = FspIopCreateRequest(Irp, FileNameRequired ? &FsContext->FileName : 0, 0, &Request);
if (!NT_SUCCESS(Result))