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Date:   Fri, 16 Nov 2018 14:38:45 +0100
From:   Christoph Hellwig <>
To:     Ming Lei <>
Cc:     Jens Axboe <>,,,,
        Dave Chinner <>,
        Kent Overstreet <>,
        Mike Snitzer <>,,
        Alexander Viro <>,, Shaohua Li <>,,,
        David Sterba <>,,
        "Darrick J . Wong" <>,, Gao Xiang <>,
        Christoph Hellwig <>, Theodore Ts'o <>,, Coly Li <>,, Boaz Harrosh <>,
        Bob Peterson <>,
Subject: Re: [PATCH V10 08/19] btrfs: move bio_pages_all() to btrfs

On Thu, Nov 15, 2018 at 04:52:55PM +0800, Ming Lei wrote:
> BTRFS is the only user of this helper, so move this helper into
> BTRFS, and implement it via bio_for_each_segment_all(), since
> bio->bi_vcnt may not equal to number of pages after multipage bvec
> is enabled.

btrfs only uses the value to check if it is larger than 1.  No amount
of multipage bio merging should ever make bi_vcnt go from 0 to 1 or
vice versa.

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