new : allow compression in default setup

With the default mount options, compression of new files are now done
if the parent directory is marked for compression. The mount option
"compression" is not needed any more, but the option "nocompression"
can be used to disable compression of new files.

The default option also applies to applications using libntfs-3g with
no mount command.

include/ntfs-3g/param.h

@@ -44,7 +44,7 @@ enum {
  */
 
 	/* default option for compression */
-#define DEFAULT_COMPRESSION FALSE
+#define DEFAULT_COMPRESSION 1
 	/* (log2 of) number of clusters in a compression block for new files */
 #define STANDARD_COMPRESSION_UNIT 4
 	/* maximum cluster size for allowing compression for new files */

libntfs-3g/volume.c

@@ -54,6 +54,7 @@
 #include <locale.h>
 #endif
 
+#include "param.h"
 #include "compat.h"
 #include "volume.h"
 #include "attrib.h"
@@ -501,6 +502,12 @@ ntfs_volume *ntfs_volume_startup(struct ntfs_device *dev, unsigned long flags)
 	NVolSetShowSysFiles(vol);
 	NVolSetShowHidFiles(vol);
 	NVolClearHideDotFiles(vol);
+		/* set default compression */
+#if DEFAULT_COMPRESSION
+	NVolSetCompression(vol);
+#else
+	NVolClearCompression(vol);
+#endif
 	if (flags & MS_RDONLY)
 		NVolSetReadOnly(vol);
 	

src/lowntfs-3g.c

@@ -3433,6 +3433,8 @@ static int ntfs_open(const char *device)
 		NDevSetSync(ctx->vol->dev);
 	if (ctx->compression)
 		NVolSetCompression(ctx->vol);
+	else
+		NVolClearCompression(ctx->vol);
 #ifdef HAVE_SETXATTR
 			/* archivers must see hidden files */
 	if (ctx->efs_raw)

src/ntfs-3g.c

@@ -3350,6 +3350,8 @@ static int ntfs_open(const char *device)
 		NDevSetSync(ctx->vol->dev);
 	if (ctx->compression)
 		NVolSetCompression(ctx->vol);
+	else
+		NVolClearCompression(ctx->vol);
 #ifdef HAVE_SETXATTR
 			/* archivers must see hidden files */
 	if (ctx->efs_raw)