linux-kernel - Re: [PATCH 18/21] iomap: Convert iomap_add_to

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Message-ID: <YYOciWjJJe6L4cyZ@infradead.org>
Date:   Thu, 4 Nov 2021 01:40:41 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 18/21] iomap: Convert iomap_add_to_ioend to take a folio

On Thu, Nov 04, 2021 at 01:38:48AM -0700, Christoph Hellwig wrote:
> > I _think_ we restrict the maximum file size to 2^63 - 1 to avoid i_size
> > ever being negative.  But that means that end_pos might be 2^63 (ie
> > LONG_MIN), so we need to subtract one from it to get the right answer.
> > Maybe worth a comment?
> 
> Yes, please.

Or we should stick to the u64 type that the existing code uses to side
step that whole issue..