+ /*
+ * device/file sizes are zero and no size given, punt
+ */
+ if ((!total_size || total_size == -1ULL) && !td->o.size) {
+ log_err("%s: you need to specify size=\n", td->o.name);
+ td_verror(td, EINVAL, "total_file_size");
+ return 1;
+ }
+
+ /*
+ * now file sizes are known, so we can set ->io_size. if size= is
+ * not given, ->io_size is just equal to ->real_file_size. if size
+ * is given, ->io_size is size / nr_files.
+ */
+ extend_size = total_size = 0;
+ need_extend = 0;
+ for_each_file(td, f, i) {
+ f->file_offset = td->o.start_offset;
+
+ if (!td->o.file_size_low) {
+ /*
+ * no file size range given, file size is equal to
+ * total size divided by number of files. if that is
+ * zero, set it to the real file size.
+ */
+ f->io_size = td->o.size / td->o.nr_files;
+ if (!f->io_size) {
+ if (f->file_offset > f->real_file_size)
+ goto err_offset;
+ f->io_size = f->real_file_size - f->file_offset;
+ }
+ } else if (f->real_file_size < td->o.file_size_low ||
+ f->real_file_size > td->o.file_size_high) {
+ if (f->file_offset > td->o.file_size_low)
+ goto err_offset;
+ /*
+ * file size given. if it's fixed, use that. if it's a
+ * range, generate a random size in-between.
+ */
+ if (td->o.file_size_low == td->o.file_size_high)
+ f->io_size = td->o.file_size_low - f->file_offset;
+ else
+ f->io_size = get_rand_file_size(td) - f->file_offset;
+ } else if (f->file_offset > f->real_file_size)
+ goto err_offset;
+ else
+ f->io_size = f->real_file_size - f->file_offset;
+
+ if (f->io_size == -1ULL)
+ total_size = -1ULL;
+ else
+ total_size += f->io_size;
+
+ if (f->filetype == FIO_TYPE_FILE &&
+ (f->io_size + f->file_offset) > f->real_file_size &&
+ !(td->io_ops->flags & FIO_DISKLESSIO)) {
+ need_extend++;
+ extend_size += (f->io_size + f->file_offset);
+ f->flags |= FIO_FILE_EXTEND;
+ }
+ }
+
+ if (!td->o.size || td->o.size > total_size)
+ td->o.size = total_size;
+
+ /*
+ * See if we need to extend some files
+ */
+ if (need_extend) {
+ temp_stall_ts = 1;
+ log_info("%s: Laying out IO file(s) (%u file(s) / %LuMiB)\n",
+ td->o.name, need_extend, extend_size >> 20);
+
+ for_each_file(td, f, i) {
+ if (!(f->flags & FIO_FILE_EXTEND))
+ continue;
+
+ assert(f->filetype == FIO_TYPE_FILE);
+ f->flags &= ~FIO_FILE_EXTEND;
+ f->real_file_size = (f->io_size + f->file_offset);
+ err = extend_file(td, f);
+ if (err)
+ break;
+ }
+ temp_stall_ts = 0;
+ }
+
+ if (err)
+ return err;
+
+ if (!td->o.zone_size)
+ td->o.zone_size = td->o.size;
+
+ /*
+ * iolog already set the total io size, if we read back
+ * stored entries.
+ */
+ if (!td->o.read_iolog_file)
+ td->total_io_size = td->o.size * td->o.loops;
+ return 0;
+err_offset:
+ log_err("%s: you need to specify valid offset=\n", td->o.name);
+ return 1;