linux-kernel - Re: [PATCH v2 2/7] bvec/iter: disallow zero-length segment bvecs

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Message-ID: <20210104163755.GA22407@casper.infradead.org>
Date:   Mon, 4 Jan 2021 16:37:55 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Ming Lei <ming.lei@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Jonathan Corbet <corbet@....net>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, target-devel@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 2/7] bvec/iter: disallow zero-length segment bvecs

On Sat, Jan 02, 2021 at 03:17:34PM +0000, Pavel Begunkov wrote:
> --- a/Documentation/filesystems/porting.rst
> +++ b/Documentation/filesystems/porting.rst
> @@ -865,3 +865,10 @@ no matter what.  Everything is handled by the caller.
>  
>  clone_private_mount() returns a longterm mount now, so the proper destructor of
>  its result is kern_unmount() or kern_unmount_array().
> +
> +---
> +
> +**mandatory**
> +
> +zero-length bvec segments are disallowed, they must be filtered out before
> +passed on to an iterator.

Why are you putting this in filesystems/porting?  Filesystems don't usually
generate bvecs ... there's nothing in this current series that stops them.
I'd suggest Documentation/block/biovecs.rst or biodoc.rst (and frankly,
biodoc.rst needs a good cleanup)