[fireball] 32107: - Make caching enable/disable a runtime switch instead of a compile time one.

Author: fireball
Date: Sun Feb  3 21:51:48 2008
New Revision: 32107

URL: http://svn.reactos.org/svn/reactos?rev=32107&view=rev
Log:
- Make caching enable/disable a runtime switch instead of a compile time one.

Modified:
    trunk/reactos/boot/freeldr/freeldr/fs/fat.c

Modified: trunk/reactos/boot/freeldr/freeldr/fs/fat.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/fs/fat...
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/fs/fat.c (original)
+++ trunk/reactos/boot/freeldr/freeldr/fs/fat.c Sun Feb  3 21:51:48 2008
@@ -22,7 +22,7 @@
 #define NDEBUG
 #include <debug.h>

-#define CACHE_ENABLED
+BOOLEAN gCacheEnabled = TRUE;

ULONG			BytesPerSector;			/* Number of bytes per sector */
 ULONG			SectorsPerCluster;		/* Number of sectors per cluster */
@@ -336,28 +336,30 @@
    }
    MmHeapFree(FatVolumeBootSector);

-#ifdef CACHE_ENABLED
-	//
-	// Initialize the disk cache for this drive
-	//
-	if (!CacheInitializeDrive(DriveNumber))
-	{
-		return FALSE;
-	}
-
-	//
-	// Force the FAT sectors into the cache
-	// as long as it is FAT12 or FAT16. FAT32 can
-	// have a multi-megabyte FAT so we don't want that.
-	//
-	if (FatType != FAT32 && FatType != FATX32)
-	{
-		if (!CacheForceDiskSectorsIntoCache(DriveNumber, ActiveFatSectorStart, SectorsPerFat))
+	if (gCacheEnabled)
+	{
+		//
+		// Initialize the disk cache for this drive
+		//
+		if (!CacheInitializeDrive(DriveNumber))
    	{
    		return FALSE;
    	}
-	}
-#else
+
+		//
+		// Force the FAT sectors into the cache
+		// as long as it is FAT12 or FAT16. FAT32 can
+		// have a multi-megabyte FAT so we don't want that.
+		//
+		if (FatType != FAT32 && FatType != FATX32)
+		{
+			if (!CacheForceDiskSectorsIntoCache(DriveNumber, ActiveFatSectorStart, SectorsPerFat))
+			{
+				return FALSE;
+			}
+		}
+	}
+	else
    {
    	GEOMETRY DriveGeometry;
    	ULONG BlockSize;
@@ -370,7 +372,6 @@

BlockSize = MachDiskGetCacheableBlockCount(DriveNumber);
    }
-#endif

return TRUE;
 }
@@ -1422,21 +1423,24 @@

BOOLEAN FatReadVolumeSectors(ULONG DriveNumber, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer)
 {
-#ifdef CACHE_ENABLED
-	return CacheReadDiskSectors(DriveNumber, SectorNumber + FatVolumeStartSector, SectorCount, Buffer);
-#else
-	// Now try to read in the block
-	if (!MachDiskReadLogicalSectors(DriveNumber, SectorNumber + FatVolumeStartSector, SectorCount, (PVOID)DISKREADBUFFER))
-	{
-		return FALSE;
-	}
-
-	// Copy data to the caller
-	RtlCopyMemory(Buffer, (PVOID)DISKREADBUFFER, SectorCount * BytesPerSector);
-
-	// Return success
-	return TRUE;
-#endif
+	if (gCacheEnabled)
+	{
+		return CacheReadDiskSectors(DriveNumber, SectorNumber + FatVolumeStartSector, SectorCount, Buffer);
+	}
+	else
+	{
+		// Now try to read in the block
+		if (!MachDiskReadLogicalSectors(DriveNumber, SectorNumber + FatVolumeStartSector, SectorCount, (PVOID)DISKREADBUFFER))
+		{
+			return FALSE;
+		}
+
+		// Copy data to the caller
+		RtlCopyMemory(Buffer, (PVOID)DISKREADBUFFER, SectorCount * BytesPerSector);
+
+		// Return success
+		return TRUE;
+	}
 }

const FS_VTBL FatVtbl = {