> +     if (sb->s_iflags & SB_I_DYNBDI) {
> +             bdi_put(sb->s_bdi);
> +             sb->s_bdi = &noop_backing_dev_info;

At some point I'd really like to get rid of noop_backing_dev_info and
have a NULL here..

Otherwise this looks fine..

Reviewed-by: Christoph Hellwig <[email protected]>
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