use a disk image format on top of
it (default for
bdrv_file_open()) */
-#define BDRV_O_DIRECT 0x0020
+#define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
+#define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
+
+#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB)
void bdrv_info(void);
void bdrv_info_stats(void);