Hervé Poussineau <poussine@freesurf.fr>
Use fast mutexes instead of spin locks because the file system callbacks shouldn't be called at DISPATCH_LEVEL.

Modified: trunk/reactos/ntoskrnl/io/fs.c

--- trunk/reactos/ntoskrnl/io/fs.c	2005-01-28 21:04:12 UTC (rev 13356)
+++ trunk/reactos/ntoskrnl/io/fs.c	2005-01-28 21:17:11 UTC (rev 13357)
@@ -1,4 +1,4 @@

-/* $Id:$

+/* $Id$

  * 
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS kernel
@@ -35,7 +35,7 @@

 static ERESOURCE FileSystemListLock;
 static LIST_ENTRY FileSystemListHead;
 

-static KSPIN_LOCK FsChangeNotifyListLock;

+static FAST_MUTEX FsChangeNotifyListLock;

 static LIST_ENTRY FsChangeNotifyListHead;
 
 #define TAG_FILE_SYSTEM       TAG('F', 'S', 'Y', 'S')
@@ -178,7 +178,7 @@

   ExInitializeResourceLite(&FileSystemListLock);
 
   InitializeListHead(&FsChangeNotifyListHead);

-  KeInitializeSpinLock(&FsChangeNotifyListLock);

+  ExInitializeFastMutex(&FsChangeNotifyListLock);

 }
 
 
@@ -709,9 +709,8 @@

 {
   PFS_CHANGE_NOTIFY_ENTRY ChangeEntry;
   PLIST_ENTRY Entry;

-  KIRQL oldlvl;

-  KeAcquireSpinLock(&FsChangeNotifyListLock,&oldlvl);

+  ExAcquireFastMutex(&FsChangeNotifyListLock);

   Entry = FsChangeNotifyListHead.Flink;
   while (Entry != &FsChangeNotifyListHead)
     {
@@ -721,7 +720,7 @@

 
       Entry = Entry->Flink;
     }

-  KeReleaseSpinLock(&FsChangeNotifyListLock,oldlvl);

+  ExReleaseFastMutex(&FsChangeNotifyListLock);

 }
 
 
@@ -743,9 +742,10 @@

   Entry->DriverObject = DriverObject;
   Entry->FSDNotificationProc = FSDNotificationProc;
 

-  ExInterlockedInsertHeadList(&FsChangeNotifyListHead,
-			      &Entry->FsChangeNotifyList,
-			      &FsChangeNotifyListLock);

+  ExAcquireFastMutex(&FsChangeNotifyListLock);
+  InsertHeadList(&FsChangeNotifyListHead,
+			      &Entry->FsChangeNotifyList);
+  ExReleaseFastMutex(&FsChangeNotifyListLock);

 
   return(STATUS_SUCCESS);
 }
@@ -760,7 +760,6 @@

 {
   PFS_CHANGE_NOTIFY_ENTRY ChangeEntry;
   PLIST_ENTRY Entry;

-  KIRQL oldlvl;

 
   Entry = FsChangeNotifyListHead.Flink;
   while (Entry != &FsChangeNotifyListHead)
@@ -769,9 +768,9 @@

       if (ChangeEntry->DriverObject == DriverObject &&
 	  ChangeEntry->FSDNotificationProc == FSDNotificationProc)
 	{

-	  KeAcquireSpinLock(&FsChangeNotifyListLock,&oldlvl);

+	  ExAcquireFastMutex(&FsChangeNotifyListLock);

 	  RemoveEntryList(Entry);

-	  KeReleaseSpinLock(&FsChangeNotifyListLock,oldlvl);

+	  ExReleaseFastMutex(&FsChangeNotifyListLock);

 
 	  ExFreePool(Entry);
 	  return;