> +     if (bio->bi_phys_segments == -1)
> +             bio->bi_phys_segments = 1;
> +     else
> +             bio->bi_phys_segments++;

Minor nitpickm but I'd kust write this as:

        if (bio->bi_phys_segments == -1)
                bio->bi_phys_segments = 0;
        bio->bi_phys_segments++;

Otherwise this looks fine:

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

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