37     BlockBackend *top;  member
72     BlockDriverState *top_bs = blk_bs(s->top);  in commit_abort()
126     blk_unref(s->top);  in commit_clean()
138     len = blk_co_getlength(s->top);  in commit_run()
156     buf = blk_blockalign(s->top, COMMIT_BUFFER_SIZE);  in commit_run()
170         ret = blk_co_is_allocated_above(s->top, s->base_overlay, true,  in commit_run()
177             ret = blk_co_pread(s->top, offset, n, buf, 0);  in commit_run()
256                   BlockDriverState *base, BlockDriverState *top,  in commit_start()  argument
272     assert(top != bs);  in commit_start()
274     if (bdrv_skip_filters(top) == bdrv_skip_filters(base)) {  in commit_start()
287     top_size = bdrv_getlength(top);  in commit_start()
326     commit_top_bs->total_sectors = top->total_sectors;  in commit_start()
328     ret = bdrv_append(commit_top_bs, top, errp);  in commit_start()
346     s->base_overlay = bdrv_find_overlay(top, base);  in commit_start()
364     for (iter = top; iter != base; iter = bdrv_filter_or_cow_bs(iter)) {  in commit_start()
406     s->top = blk_new(s->common.job.aio_context, 0, BLK_PERM_ALL);  in commit_start()
407     ret = blk_insert_bs(s->top, top, errp);  in commit_start()
411     blk_set_disable_request_queuing(s->top, true);  in commit_start()
417     trace_commit_start(bs, base, top, s);  in commit_start()
430     if (s->top) {  in commit_start()
431         blk_unref(s->top);  in commit_start()
440         bdrv_drained_begin(top);  in commit_start()
442         bdrv_replace_node(commit_top_bs, top, &error_abort);  in commit_start()
444         bdrv_drained_end(top);  in commit_start()