return 32 - clz32(i);
}
+/*
+ * Make sure data goes on disk, but if possible do not bother to
+ * write out the inode just for timestamp updates.
+ *
+ * Unfortunately even in 2009 many operating systems do not support
+ * fdatasync and have to fall back to fsync.
+ */
+int qemu_fdatasync(int fd)
+{
+#ifdef _POSIX_SYNCHRONIZED_IO
+ return fdatasync(fd);
+#else
+ return fsync(fd);
+#endif
+}
+
/* io vectors */
void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)