Index: block.c
===================================================================
RCS file: /sources/qemu/qemu/block.c,v
retrieving revision 1.27
diff -u -1 -0 -r1.27 block.c
--- block.c	4 Jun 2006 11:39:07 -0000	1.27
+++ block.c	26 Jun 2006 08:39:03 -0000
@@ -754,32 +754,75 @@
         return -1;
     return 0;
 }
 
 static void raw_close(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     close(s->fd);
 }
 
+#ifdef _WIN32
+#include <windows.h>
+#include <winioctl.h>
+
+int qemu_ftruncate64(int fd, int64_t length)
+{
+    LARGE_INTEGER li;
+    LONG high;
+    HANDLE h;
+    BOOL res;
+
+    if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
+	return -1;
+
+    h = (HANDLE)_get_osfhandle(fd);
+
+    /* get current position, ftruncate do not change position */
+    li.HighPart = 0;
+    li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
+    if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
+	return -1;
+
+    high = length >> 32;
+    if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
+	return -1;
+    res = SetEndOfFile(h);
+
+    /* back to old position */
+    SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
+    return res ? 0 : -1;
+}
+
+static int set_sparse(int fd)
+{
+    DWORD returned;
+    return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
+				 NULL, 0, NULL, 0, &returned, NULL);
+}
+#else
+#define set_sparse(fd) 1
+#endif
+
 static int raw_create(const char *filename, int64_t total_size,
                       const char *backing_file, int flags)
 {
     int fd;
 
     if (flags || backing_file)
         return -ENOTSUP;
 
     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 
               0644);
     if (fd < 0)
         return -EIO;
+    set_sparse(fd);
     ftruncate(fd, total_size * 512);
     close(fd);
     return 0;
 }
 
 static void raw_flush(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     fsync(s->fd);
 }
Index: vl.h
===================================================================
RCS file: /sources/qemu/qemu/vl.h,v
retrieving revision 1.132
diff -u -1 -0 -r1.132 vl.h
--- vl.h	25 Jun 2006 22:28:15 -0000	1.132
+++ vl.h	26 Jun 2006 08:39:07 -0000
@@ -44,22 +44,23 @@
 #endif
 #ifndef O_BINARY
 #define O_BINARY 0
 #endif
 
 #ifdef _WIN32
 #include <windows.h>
 #define fsync _commit
 #define lseek _lseeki64
 #define ENOTSUP 4096
-/* XXX: find 64 bit version */
-#define ftruncate chsize
+extern int qemu_ftruncate64(int, int64_t);
+#define ftruncate qemu_ftruncate64
+
 
 static inline char *realpath(const char *path, char *resolved_path)
 {
     _fullpath(resolved_path, path, _MAX_PATH);
     return resolved_path;
 }
 
 #define PRId64 "I64d"
 #define PRIx64 "I64x"
 #define PRIu64 "I64u"