[pschweitzer] 72124: [FASTFAT] Track child FCB in parent FCB to allow browsing them in case it's needed. This allows fixing a FIXME and offering better performances when renaming a directory. CORE-...

Author: pschweitzer
Date: Sat Aug  6 08:30:30 2016
New Revision: 72124

URL: http://svn.reactos.org/svn/reactos?rev=72124&view=rev
Log:
[FASTFAT]
Track child FCB in parent FCB to allow browsing them in case it's needed.
This allows fixing a FIXME and offering better performances when renaming a directory.

CORE-11377
CORE-11426

Modified:
    trunk/reactos/drivers/filesystems/fastfat/fcb.c
    trunk/reactos/drivers/filesystems/fastfat/finfo.c

Modified: trunk/reactos/drivers/filesystems/fastfat/fcb.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/fcb.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/fcb.c	[iso-8859-1] Sat Aug  6 08:30:30 2016
@@ -153,6 +153,7 @@
     rcFCB->RFCB.PagingIoResource = &rcFCB->PagingIoResource;
     rcFCB->RFCB.Resource = &rcFCB->MainResource;
     rcFCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
+    InitializeListHead(&rcFCB->ParentListHead);
 
     return  rcFCB;
 }
@@ -271,6 +272,8 @@
     ExDeleteResourceLite(&pFCB->PagingIoResource);
     ExDeleteResourceLite(&pFCB->MainResource);
     ExFreeToNPagedLookasideList(&VfatGlobalData->FcbLookasideList, pFCB);
+    RemoveEntryList(&pFCB->ParentListEntry);
+    ASSERT(IsListEmpty(&pFCB->ParentListHead));
 }
 
 BOOLEAN
@@ -455,6 +458,7 @@
 
     /* Save old parent */
     OldParent = Fcb->parentFcb;
+    RemoveEntryList(&Fcb->ParentListEntry);
 
     /* Reinit FCB */
     vfatInitFCBFromDirEntry(pVCB, Fcb, DirContext);
@@ -464,6 +468,7 @@
         CcFlushCache(&Fcb->SectionObjectPointers, NULL, 0, NULL);
     }
     Fcb->parentFcb = ParentFcb;
+    InsertTailList(&ParentFcb->ParentListHead, &Fcb->ParentListEntry);
     vfatAddFCBToTable(pVCB, Fcb);
 
     /* If we moved across directories, dereference our old parent
@@ -673,6 +678,7 @@
         vfatFCBInitializeCacheFromVolume(vcb, rcFCB);
     }
     rcFCB->parentFcb = directoryFCB;
+    InsertTailList(&directoryFCB->ParentListHead,
&rcFCB->ParentListEntry);
     vfatAddFCBToTable(vcb, rcFCB);
     *fileFCB = rcFCB;
 

Modified: trunk/reactos/drivers/filesystems/fastfat/finfo.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/finfo.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/finfo.c	[iso-8859-1] Sat Aug  6 08:30:30
2016
@@ -704,19 +704,17 @@
     vfatSplitPathName(&NewName, &NewPath, &NewFile);
     DPRINT("New dir: %wZ, New file: %wZ\n", &NewPath, &NewFile);
 
-    /* FIXME: Do it in a more efficient way, like linking FCBs to their parent FCB so
that we browse less FCBs
-     * Note: The FIXME is the way MS FastFAT seems to do it
-     */
-    if (vfatFCBIsDirectory(FCB))
+    if (vfatFCBIsDirectory(FCB) && !IsListEmpty(&FCB->ParentListHead))
     {
         PLIST_ENTRY Entry;
         PVFATFCB VolFCB;
 
-        for (Entry = DeviceExt->FcbListHead.Flink; Entry !=
&DeviceExt->FcbListHead; Entry = Entry->Flink)
-        {
-            VolFCB = CONTAINING_RECORD(Entry, VFATFCB, FcbListEntry);
-            if (VolFCB->parentFcb == FCB && VolFCB->OpenHandleCount != 0)
-            {
+        for (Entry = FCB->ParentListHead.Flink; Entry != &FCB->ParentListHead;
Entry = Entry->Flink)
+        {
+            VolFCB = CONTAINING_RECORD(Entry, VFATFCB, ParentListEntry);
+            if (VolFCB->OpenHandleCount != 0)
+            {
+                ASSERT(VolFCB->parentFCB == FCB);
                 DPRINT1("At least one children file opened! %wZ (%u, %u)\n",
&VolFCB->PathNameU, VolFCB->RefCount, VolFCB->OpenHandleCount);
                 Status = STATUS_ACCESS_DENIED;
                 ASSERT(OldReferences == FCB->parentFcb->RefCount);