static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target,
                             const char *replaces,
                             int64_t speed, uint32_t granularity,
                             int64_t buf_size,
                             BlockdevOnError on_source_error,
                             BlockdevOnError on_target_error,
                             bool unmap,
                             BlockCompletionFunc *cb,
                             void *opaque, Error **errp,
                             const BlockJobDriver *driver,
                             bool is_none_mode, BlockDriverState *base)
{
    MirrorBlockJob *s;
    BlockDriverState *replaced_bs;
    if (granularity == 0) {
        granularity = bdrv_get_default_bitmap_granularity(target);
    assert ((granularity & (granularity - 1)) == 0);
    if ((on_source_error == BLOCKDEV_ON_ERROR_STOP ||
         on_source_error == BLOCKDEV_ON_ERROR_ENOSPC) &&
        (!bs->blk || !blk_iostatus_is_enabled(bs->blk))) {
        error_setg(errp, QERR_INVALID_PARAMETER, "on-source-error");
    if (buf_size < 0) {
        error_setg(errp, "Invalid parameter 'buf-size'");
    if (buf_size == 0) {
        buf_size = DEFAULT_MIRROR_BUF_SIZE;
    s = block_job_create(driver, bs, speed, cb, opaque, errp);
    if (!s) {
    s->replaces = g_strdup(replaces);
    s->on_source_error = on_source_error;
    s->on_target_error = on_target_error;
    s->target = target;
    s->is_none_mode = is_none_mode;
    s->base = base;
    s->granularity = granularity;
    s->buf_size = ROUND_UP(buf_size, granularity);
    s->unmap = unmap;
    s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
    if (!s->dirty_bitmap) {
        g_free(s->replaces);
        block_job_unref(&s->common);
    bdrv_op_block_all(s->target, s->common.blocker);
    bdrv_set_enable_write_cache(s->target, true);
    if (s->target->blk) {
        blk_set_on_error(s->target->blk, on_target_error, on_target_error);
        blk_iostatus_enable(s->target->blk);
    s->common.co = qemu_coroutine_create(mirror_run);
    trace_mirror_start(bs, s, s->common.co, opaque);
    qemu_coroutine_enter(s->common.co, s);