[NTFS] Use LookasideList allocations for NTFS_ATTR_CONTEXT.

TODO: use a specific tag

drivers/filesystems/ntfs/mft.c

@@ -42,9 +42,7 @@ PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord)
 {
     PNTFS_ATTR_CONTEXT Context;
 
-    Context = ExAllocatePoolWithTag(NonPagedPool,
-                                    sizeof(NTFS_ATTR_CONTEXT),
-                                    TAG_NTFS);
+    Context = ExAllocateFromNPagedLookasideList(&NtfsGlobalData->AttrCtxtLookasideList);
     if(!Context)
     {
         DPRINT1("Error: Unable to allocate memory for context!\n");
@@ -56,7 +54,7 @@ PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord)
     if(!Context->pRecord)
     {
         DPRINT1("Error: Unable to allocate memory for attribute record!\n");
-        ExFreePoolWithTag(Context, TAG_NTFS);
+        ExFreeToNPagedLookasideList(&NtfsGlobalData->AttrCtxtLookasideList, Context);
         return NULL;
     }
 
@@ -93,7 +91,7 @@ PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord)
         {
             DPRINT1("Unable to convert data runs to MCB!\n");
             ExFreePoolWithTag(Context->pRecord, TAG_NTFS);
-            ExFreePoolWithTag(Context, TAG_NTFS);
+            ExFreeToNPagedLookasideList(&NtfsGlobalData->AttrCtxtLookasideList, Context);
             return NULL;
         }
     }
@@ -115,7 +113,7 @@ ReleaseAttributeContext(PNTFS_ATTR_CONTEXT Context)
         ExFreePoolWithTag(Context->pRecord, TAG_NTFS);
     }
 
-    ExFreePoolWithTag(Context, TAG_NTFS);
+    ExFreeToNPagedLookasideList(&NtfsGlobalData->AttrCtxtLookasideList, Context);
 }
 
 

drivers/filesystems/ntfs/ntfs.c

@@ -146,6 +146,9 @@ DriverEntry(PDRIVER_OBJECT DriverObject,
     /* Initialize lookaside list for FCBs */
     ExInitializeNPagedLookasideList(&NtfsGlobalData->FcbLookasideList,
                                     NULL, NULL, 0, sizeof(NTFS_FCB), TAG_FCB, 0);
+    /* Initialize lookaside list for attributes contexts */
+    ExInitializeNPagedLookasideList(&NtfsGlobalData->AttrCtxtLookasideList,
+                                    NULL, NULL, 0, sizeof(NTFS_ATTR_CONTEXT), TAG_NTFS, 0);
 
     /* Driver can't be unloaded */
     DriverObject->DriverUnload = NULL;

drivers/filesystems/ntfs/ntfs.h

@@ -152,6 +152,7 @@ typedef struct
     FAST_IO_DISPATCH FastIoDispatch;
     NPAGED_LOOKASIDE_LIST IrpContextLookasideList;
     NPAGED_LOOKASIDE_LIST FcbLookasideList;
+    NPAGED_LOOKASIDE_LIST AttrCtxtLookasideList;
     BOOLEAN EnableWriteSupport;
 } NTFS_GLOBAL_DATA, *PNTFS_GLOBAL_DATA;