+extern char **do_tune2fs_l (const char *device);
+extern int do_blockdev_setro (const char *device);
+extern int do_blockdev_setrw (const char *device);
+extern int do_blockdev_getro (const char *device);
+extern int do_blockdev_getss (const char *device);
+extern int do_blockdev_getbsz (const char *device);
+extern int do_blockdev_setbsz (const char *device, int blocksize);
+extern int64_t do_blockdev_getsz (const char *device);
+extern int64_t do_blockdev_getsize64 (const char *device);
+extern int do_blockdev_flushbufs (const char *device);
+extern int do_blockdev_rereadpt (const char *device);