[tthompson] 71857: [NTFS] Simplify GetLastClusterInDataRun() and clean up NtfsAllocateClusters(). No functional changes.

Author: tthompson
Date: Fri Jul  8 11:59:25 2016
New Revision: 71857

URL: http://svn.reactos.org/svn/reactos?rev=71857&view=rev
Log:
[NTFS]
Simplify GetLastClusterInDataRun() and clean up NtfsAllocateClusters(). No functional
changes.

Modified:
    branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/attrib.c
    branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/volinfo.c

Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/attrib.c
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/attrib.c	[iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/attrib.c	[iso-8859-1] Fri Jul  8
11:59:25 2016
@@ -583,28 +583,16 @@
     {
         DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
        
-        if (DataRunOffset == -1)
-        {
-            // sparse run
-            if (*DataRun == 0)
-            {
-                // if it's the last run, return the last cluster of the last run
-                *LastCluster = LastLCN + DataRunLength - 1;
-                break;
-            }
-        }
-        else
+        if (DataRunOffset != -1)
         {
             // Normal data run.
             DataRunStartLCN = LastLCN + DataRunOffset;
             LastLCN = DataRunStartLCN;
+            *LastCluster = LastLCN + DataRunLength - 1;
         }             
 
-        if (*DataRun == 0)
-        {
-            *LastCluster = LastLCN + DataRunLength - 1;
-            break;
-        }
+        if (*DataRun == 0)            
+            break;
     }
 
     return STATUS_SUCCESS;

Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/volinfo.c
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/volinfo.c	[iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/volinfo.c	[iso-8859-1] Fri Jul  8
11:59:25 2016
@@ -162,38 +162,35 @@
     RtlInitializeBitMap(&Bitmap, (PULONG)BitmapData,
DeviceExt->NtfsInfo.ClusterCount);
     FreeClusters = RtlNumberOfClearBits(&Bitmap);
 
-    if (FreeClusters >= DesiredClusters)
-    {
-        // TODO: Observe MFT reservation zone
-
-        // Can we get one contiguous run?
-        ULONG AssignedRun = RtlFindClearBitsAndSet(&Bitmap, DesiredClusters,
FirstDesiredCluster);
-        ULONG LengthWritten;
-
-        if (AssignedRun != 0xFFFFFFFF)
+    if( FreeClusters < DesiredClusters )
+        Status = STATUS_DISK_FULL;
+    
+    // TODO: Observe MFT reservation zone
+
+    // Can we get one contiguous run?
+    ULONG AssignedRun = RtlFindClearBitsAndSet(&Bitmap, DesiredClusters,
FirstDesiredCluster);
+    ULONG LengthWritten;
+
+    if (AssignedRun != 0xFFFFFFFF)
+    {
+        *FirstAssignedCluster = AssignedRun;
+        *AssignedClusters = DesiredClusters;
+    }
+    else
+    {
+        // we can't get one contiguous run
+        *AssignedClusters = RtlFindNextForwardRunClear(&Bitmap, FirstDesiredCluster,
FirstAssignedCluster);
+        
+        if (*AssignedClusters == 0)
         {
-            *FirstAssignedCluster = AssignedRun;
-            *AssignedClusters = DesiredClusters;
+            // we couldn't find any runs starting at DesiredFirstCluster
+            *AssignedClusters = RtlFindLongestRunClear(&Bitmap,
FirstAssignedCluster);
         }
-        else
-        {
-            // we can't get one contiguous run
-            *AssignedClusters = RtlFindNextForwardRunClear(&Bitmap,
FirstDesiredCluster, FirstAssignedCluster);
-        
-            if (*AssignedClusters == 0)
-            {
-                // we couldn't find any runs starting at DesiredFirstCluster
-                *AssignedClusters = RtlFindLongestRunClear(&Bitmap,
FirstAssignedCluster);
-            }
             
-        }
+    }
                 
-        Status = WriteAttribute(DeviceExt, DataContext, 0, BitmapData,
(ULONG)BitmapDataSize, &LengthWritten);
-    }
-    else
-        Status = STATUS_DISK_FULL;
-
-
+    Status = WriteAttribute(DeviceExt, DataContext, 0, BitmapData, (ULONG)BitmapDataSize,
&LengthWritten);
+    
     ReleaseAttributeContext(DataContext);
 
     ExFreePoolWithTag(BitmapData, TAG_NTFS);