40     BlockBackend *base;  member
59     /* Remove base node parent that still uses BLK_PERM_WRITE/RESIZE before  in commit_prepare()
61     blk_unref(s->base);  in commit_prepare()
62     s->base = NULL;  in commit_prepare()
87     if (s->base) {  in commit_abort()
88         blk_unref(s->base);  in commit_abort()
101      * something to base, the intermediate images aren't valid any more. */  in commit_abort()
120     /* restore base open flags here if appropriate (e.g., change the base back  in commit_clean()
139     /* Copy if allocated above the base */  in commit_iteration()
155              * If the top (sub)clusters are smaller than the base  in commit_iteration()
160             ret = blk_co_pwrite_zeroes(s->base, offset, bytes,  in commit_iteration()
174             ret = blk_co_pwrite(s->base, offset, bytes, buf, 0);  in commit_iteration()
224     base_len = blk_co_getlength(s->base);  in commit_run()
230         ret = blk_co_truncate(s->base, len, false, PREALLOC_MODE_OFF, 0, NULL);  in commit_run()
306                   BlockDriverState *base, BlockDriverState *top,  in commit_start()  argument
324     if (bdrv_skip_filters(top) == bdrv_skip_filters(base)) {  in commit_start()
325         error_setg(errp, "Invalid files for merge: top and base are the same");  in commit_start()
331     base_size = bdrv_getlength(base);  in commit_start()
333         error_setg_errno(errp, -base_size, "Could not inquire base image size");  in commit_start()
354     /* convert base to r/w, if necessary */  in commit_start()
355     s->base_read_only = bdrv_is_read_only(base);  in commit_start()
357         if (bdrv_reopen_set_read_only(base, false, errp) != 0) {  in commit_start()
388      * Block all nodes between top and base, because they will  in commit_start()
391      * nodes (including R/W filters) between top and base.  Assuring  in commit_start()
397     s->base_overlay = bdrv_find_overlay(top, base);  in commit_start()
402      * bdrv_skip_filters(filtered_base) == bdrv_skip_filters(base)  in commit_start()
405     assert(bdrv_skip_filters(filtered_base) == bdrv_skip_filters(base));  in commit_start()
409      * at s->base (if writes are blocked for a node, they are also blocked  in commit_start()
411      * driver above s->base.  in commit_start()
415     for (iter = top; iter != base; iter = bdrv_filter_or_cow_bs(iter)) {  in commit_start()
418              * From here on, all nodes are filters on the base.  This  in commit_start()
433     if (bdrv_freeze_backing_chain(commit_top_bs, base, errp) < 0) {  in commit_start()
440     ret = block_job_add_bdrv(&s->common, "base", base, 0, BLK_PERM_ALL, errp);  in commit_start()
448     s->base = blk_new(s->common.job.aio_context,  in commit_start()
452     ret = blk_insert_bs(s->base, base, errp);  in commit_start()
456     blk_set_disable_request_queuing(s->base, true);  in commit_start()
457     s->base_bs = base;  in commit_start()
471     trace_commit_start(bs, base, top, s);  in commit_start()
478         bdrv_unfreeze_backing_chain(commit_top_bs, base);  in commit_start()
481     if (s->base) {  in commit_start()
482         blk_unref(s->base);  in commit_start()
488         bdrv_reopen_set_read_only(base, true, NULL);  in commit_start()