Re: [ros-dev] Re: [ros-svn] [hbirr] 13570: - Started the rewriting of the cache manger.

[Hartmut Birr]

Filip Navara schrieb:
> I tried it and needed the attached changes in order to boot...

Thanks for testing my changes.
> [cc02.diff] Don't try to map data past the end of file in VFAT.

I think that this patch isn't necessary, because the real problem is in 
pin.c.
> [cc03.diff] Fix incorrect check in CcMapData.

The check which you have changed was correct. Currently the file size is 
limited to the number of cache view entries. I will implement a x-level 
tree structure in the future. But some other checks are incorrect. I've 
add a patch.
> Also I've patch which fixes fast mutex implementation and it's usage, 
> which depends on these cache manager changes.

The global lock (fast mutex) implementation is a little bit dirty. 
Currently I implement a function which does remove the unneeded data 
section objects after some time. My problem is the sequence to acquire 
the segment lock and the global lock.

- Hartmut

E:\Sandbox\ros_cache\reactos>set SVN_EDITOR=notepad

E:\Sandbox\ros_cache\reactos>d:\programme\subversion\bin\svn.exe diff ntoskrnl\cc\pin.c        
Index: ntoskrnl/cc/pin.c
===================================================================
--- ntoskrnl/cc/pin.c	(Revision 13570)
+++ ntoskrnl/cc/pin.c	(Arbeitskopie)
@@ -67,20 +67,26 @@

Bcb = FileObject->SectionObjectPointer->SharedCacheMap;

-   if (FileOffset->QuadPart + Length > Bcb->FileSizes.AllocationSize.QuadPart)
+   if (FileOffset->QuadPart >= Bcb->FileSizes.FileSize.QuadPart)
    {
-      DPRINT("%d %I64d %I64d\n", Length, FileOffset->QuadPart + Length, Bcb->FileSizes.AllocationSize.QuadPart);
-//      KEBUGCHECK(0);
+      CHECKPOINT1;
+      *piBcb = NULL;
+      *pBuffer = NULL;
+      return FALSE;
    }

-   if (FileOffset->QuadPart + Length - ROUND_DOWN(FileOffset->QuadPart, CACHE_VIEW_SIZE) > CACHE_VIEW_SIZE)
+   if (FileOffset->QuadPart + Length > Bcb->FileSizes.FileSize.QuadPart)
    {
-      /* not implemented */
+      CHECKPOINT1;
+      Length = Bcb->FileSizes.FileSize.QuadPart - FileOffset->QuadPart;
+   }
+
+   if (ROUND_DOWN(FileOffset->QuadPart, CACHE_VIEW_SIZE) + CACHE_VIEW_SIZE != ROUND_UP(FileOffset->QuadPart + Length, CACHE_VIEW_SIZE))
+   {
+      /* Mapping over the border of a cache view isn't implemented */
       KEBUGCHECK(0);
    }

-
-
    if (Bcb->FileSizes.AllocationSize.QuadPart > sizeof(Bcb->CacheView) / sizeof(Bcb->CacheView[0]) * CACHE_VIEW_SIZE)
    {
       /* not implemented */