* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/fsrtl/filtrctx.c
* PURPOSE: File Stream Filter Context support for File System Drivers
- * PROGRAMMERS: None.
+ * PROGRAMMERS: Pierre Schweitzer (pierre.schweitzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
}
/*
- * @unimplemented
+ * @implemented
*/
PFSRTL_PER_STREAM_CONTEXT
NTAPI
-FsRtlLookupPerStreamContextInternal(IN PFSRTL_ADVANCED_FCB_HEADER StreamContext,
+FsRtlLookupPerStreamContextInternal(IN PFSRTL_ADVANCED_FCB_HEADER AdvFcbHeader,
IN PVOID OwnerId OPTIONAL,
IN PVOID InstanceId OPTIONAL)
{
- KeBugCheck(FILE_SYSTEM);
- return FALSE;
+ PLIST_ENTRY NextEntry;
+ PFSRTL_PER_STREAM_CONTEXT TmpPerStreamContext, PerStreamContext = NULL;
+
+ ASSERT(AdvFcbHeader);
+ ASSERT(FlagOn(AdvFcbHeader->Flags2, FSRTL_FLAG2_SUPPORTS_FILTER_CONTEXTS));
+
+ ExAcquireFastMutex(AdvFcbHeader->FastMutex);
+
+ /* If list is empty, no need to browse it */
+ if (!IsListEmpty(&(AdvFcbHeader->FilterContexts)))
+ {
+ for (NextEntry = AdvFcbHeader->FilterContexts.Flink;
+ NextEntry != &(AdvFcbHeader->FilterContexts);
+ NextEntry = NextEntry->Flink)
+ {
+ /* If we don't have any criteria for search, first entry will be enough */
+ if (!OwnerId && !InstanceId)
+ {
+ PerStreamContext = (PFSRTL_PER_STREAM_CONTEXT)NextEntry;
+ break;
+ }
+ /* Else, we've to find something that matches with the parameters. */
+ else
+ {
+ TmpPerStreamContext = CONTAINING_RECORD(NextEntry, FSRTL_PER_STREAM_CONTEXT, Links);
+ if ((InstanceId && TmpPerStreamContext->InstanceId == InstanceId && TmpPerStreamContext->OwnerId == OwnerId) ||
+ (OwnerId && TmpPerStreamContext->OwnerId == OwnerId))
+ {
+ PerStreamContext = TmpPerStreamContext;
+ break;
+ }
+ }
+ }
+ }
+ ExReleaseFastMutex(AdvFcbHeader->FastMutex);
+
+ return PerStreamContext;
}
/*
}
/*
- * @unimplemented
+ * @implemented
*/
NTSTATUS
NTAPI
-FsRtlInsertPerStreamContext(IN PFSRTL_ADVANCED_FCB_HEADER PerStreamContext,
- IN PFSRTL_PER_STREAM_CONTEXT Ptr)
+FsRtlInsertPerStreamContext(IN PFSRTL_ADVANCED_FCB_HEADER AdvFcbHeader,
+ IN PFSRTL_PER_STREAM_CONTEXT PerStreamContext)
{
- KeBugCheck(FILE_SYSTEM);
- return STATUS_NOT_IMPLEMENTED;
+ if (!(AdvFcbHeader) || !(AdvFcbHeader->Flags2 & FSRTL_FLAG2_SUPPORTS_FILTER_CONTEXTS))
+ {
+ return STATUS_INVALID_DEVICE_REQUEST;
+ }
+
+ ExAcquireFastMutex(AdvFcbHeader->FastMutex);
+ InsertHeadList(&(AdvFcbHeader->FilterContexts), &(PerStreamContext->Links));
+ ExReleaseFastMutex(AdvFcbHeader->FastMutex);
+ return STATUS_SUCCESS;
}
/*
- * @unimplemented
+ * @implemented
*/
PFSRTL_PER_STREAM_CONTEXT
NTAPI
-FsRtlRemovePerStreamContext(IN PFSRTL_ADVANCED_FCB_HEADER StreamContext,
+FsRtlRemovePerStreamContext(IN PFSRTL_ADVANCED_FCB_HEADER AdvFcbHeader,
IN PVOID OwnerId OPTIONAL,
IN PVOID InstanceId OPTIONAL)
{
- KeBugCheck(FILE_SYSTEM);
- return NULL;
+ PLIST_ENTRY NextEntry;
+ PFSRTL_PER_STREAM_CONTEXT TmpPerStreamContext, PerStreamContext = NULL;
+
+ if (!(AdvFcbHeader) || !(AdvFcbHeader->Flags2 & FSRTL_FLAG2_SUPPORTS_FILTER_CONTEXTS))
+ {
+ return NULL;
+ }
+
+ ExAcquireFastMutex(AdvFcbHeader->FastMutex);
+ /* If list is empty, no need to browse it */
+ if (!IsListEmpty(&(AdvFcbHeader->FilterContexts)))
+ {
+ for (NextEntry = AdvFcbHeader->FilterContexts.Flink;
+ NextEntry != &(AdvFcbHeader->FilterContexts);
+ NextEntry = NextEntry->Flink)
+ {
+ /* If we don't have any criteria for search, first entry will be enough */
+ if (!OwnerId && !InstanceId)
+ {
+ PerStreamContext = (PFSRTL_PER_STREAM_CONTEXT)NextEntry;
+ break;
+ }
+ /* Else, we've to find something that matches with the parameters. */
+ else
+ {
+ TmpPerStreamContext = CONTAINING_RECORD(NextEntry, FSRTL_PER_STREAM_CONTEXT, Links);
+ if ((InstanceId && TmpPerStreamContext->InstanceId == InstanceId && TmpPerStreamContext->OwnerId == OwnerId) ||
+ (OwnerId && TmpPerStreamContext->OwnerId == OwnerId))
+ {
+ PerStreamContext = TmpPerStreamContext;
+ break;
+ }
+ }
+ }
+ /* Finally remove entry from list */
+ if (PerStreamContext)
+ {
+ RemoveEntryList(&(PerStreamContext->Links));
+ }
+ }
+ ExReleaseFastMutex(AdvFcbHeader->FastMutex);
+
+ return PerStreamContext;
+
}
/*
}
/*
- * @unimplemented
+ * @implemented
*/
VOID
NTAPI
-FsRtlTeardownPerStreamContexts(IN PFSRTL_ADVANCED_FCB_HEADER AdvancedHeader)
+FsRtlTeardownPerStreamContexts(IN PFSRTL_ADVANCED_FCB_HEADER AdvFcbHeader)
{
- KeBugCheck(FILE_SYSTEM);
-}
+ PLIST_ENTRY NextEntry;
+ BOOLEAN IsMutexLocked = FALSE;
+ PFSRTL_PER_STREAM_CONTEXT PerStreamContext;
+
+ _SEH2_TRY
+ {
+ /* Acquire mutex to deal with the list */
+ ExAcquireFastMutex(AdvFcbHeader->FastMutex);
+ IsMutexLocked = TRUE;
+
+ /* While there are items... */
+ while (!IsListEmpty(&(AdvFcbHeader->FilterContexts)))
+ {
+ /* ...remove one */
+ NextEntry = RemoveHeadList(&(AdvFcbHeader->FilterContexts));
+ PerStreamContext = CONTAINING_RECORD(NextEntry, FSRTL_PER_STREAM_CONTEXT, Links);
+ /* Release mutex before calling callback */
+ ExReleaseFastMutex(AdvFcbHeader->FastMutex);
+ IsMutexLocked = FALSE;
+
+ /* Call the callback */
+ ASSERT(PerStreamContext->FreeCallback);
+ (*PerStreamContext->FreeCallback)(PerStreamContext);
+
+ /* Relock the list to continue */
+ ExAcquireFastMutex(AdvFcbHeader->FastMutex);
+ IsMutexLocked = TRUE;
+ }
+ }
+ _SEH2_FINALLY
+ {
+ /* If mutex was locked, release */
+ if (IsMutexLocked)
+ {
+ ExReleaseFastMutex(AdvFcbHeader->FastMutex);
+ }
+ }
+ _SEH2_END;
+}