+static void generate_dest_range(bool bdy_align,
+ unsigned long max_range_end,
+ unsigned long *src_offset,
+ unsigned long *size,
+ unsigned long *dst_offset)
+{
+ int tries = 0;
+
+ TRIM_OFF_LEN(*src_offset, *size, file_size);
+ if (bdy_align) {
+ *src_offset -= *src_offset % readbdy;
+ if (o_direct)
+ *size -= *size % readbdy;
+ } else {
+ *src_offset = *src_offset & ~(block_size - 1);
+ *size = *size & ~(block_size - 1);
+ }
+
+ do {
+ if (tries++ >= 30) {
+ *size = 0;
+ break;
+ }
+ *dst_offset = random();
+ TRIM_OFF(*dst_offset, max_range_end);
+ if (bdy_align)
+ *dst_offset -= *dst_offset % writebdy;
+ else
+ *dst_offset = *dst_offset & ~(block_size - 1);
+ } while (range_overlaps(*src_offset, *dst_offset, *size) ||
+ *dst_offset + *size > max_range_end);
+}
+