void commit_active_start(const char *job_id, BlockDriverState *bs, BlockDriverState *base, int64_t speed, BlockdevOnError on_error, BlockCompletionFunc *cb, void *opaque, Error **errp) { int64_t length, base_length; int orig_base_flags; int ret; Error *local_err = NULL; orig_base_flags = bdrv_get_flags(base); if (bdrv_reopen(base, bs->open_flags, errp)) { return; } length = bdrv_getlength(bs); if (length < 0) { error_setg_errno(errp, -length, "Unable to determine length of %s", bs->filename); goto error_restore_flags; } base_length = bdrv_getlength(base); if (base_length < 0) { error_setg_errno(errp, -base_length, "Unable to determine length of %s", base->filename); goto error_restore_flags; } if (length > base_length) { ret = bdrv_truncate(base, length); if (ret < 0) { error_setg_errno(errp, -ret, "Top image %s is larger than base image %s, and " "resize of base image failed", bs->filename, base->filename); goto error_restore_flags; } } mirror_start_job(job_id, bs, base, NULL, speed, 0, 0, MIRROR_LEAVE_BACKING_CHAIN, on_error, on_error, false, cb, opaque, &local_err, &commit_active_job_driver, false, base); if (local_err) { error_propagate(errp, local_err); goto error_restore_flags; } return; error_restore_flags: /* ignore error and errp for bdrv_reopen, because we want to propagate * the original error */ bdrv_reopen(base, orig_base_flags, NULL); return; }