linux-kernel - Re: [PATCH 4/4] iomap: cleanup iomap_write

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Date: Tue, 12 Mar 2024 05:24:00 -0700
From: Christoph Hellwig <hch@...radead.org>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: Zhang Yi <yi.zhang@...weicloud.com>, linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, brauner@...nel.org, david@...morbit.com,
	tytso@....edu, jack@...e.cz, yi.zhang@...wei.com,
	chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH 4/4] iomap: cleanup iomap_write_iter()

On Mon, Mar 11, 2024 at 09:07:39AM -0700, Darrick J. Wong wrote:
> If at some point iomap_write_end actually starts returning partial write
> completions (e.g. you wrote 250 bytes, but for some reason the pagecache
> only acknowledges 100 bytes were written) then this code no longer
> reverts the iter or truncates posteof pagecache correctly...

I don't think it makes sense to return a partial write from
iomap_write_end.  But to make that clear it really should not return
a byte count by a boolean.  I've been wanting to make that cleanup
for a while, but it would reach all the way into buffer.c.