linux-kernel - Re: [PATCH 2/2] block: Rework bio_for_each_folio

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Message-ID: <ZCrtEWEYGdGN++wX@infradead.org>
Date:   Mon, 3 Apr 2023 08:13:21 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        willy@...radead.org, axboe@...nel.dk
Subject: Re: [PATCH 2/2] block: Rework bio_for_each_folio_all()

On Mon, Mar 27, 2023 at 01:44:02PM -0400, Kent Overstreet wrote:
> +	bio_for_each_folio_all(fv, bio, iter)
> +		iomap_finish_folio_read(fv.fv_folio, fv.fv_offset, fv.fv_len, error);

Please avoid the overly long lines.  Also if we pass all arguments
of the folio_vec we might as ell just pass that folio_vec anyway.

> -	BUG_ON(iter->idx > bio->bi_vcnt || (iter->idx == bio->bi_vcnt && iter->done));
> +	BUG_ON(iter->idx > bio->bi_vcnt ||
> +	       (iter->idx == bio->bi_vcnt && iter->done));

Seems like this should be folded into the previous patch.  Also I
generally prefer to avoid top-level || in asserts and just do multiple
asserts, as that shows which condition triggered.