linux-kernel - Re: [PATCH 3/4] iomap: don't increase i

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Message-ID: <ZfBJCJqf6zOaSYRL@infradead.org>
Date: Tue, 12 Mar 2024 05:22:32 -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 3/4] iomap: don't increase i_size if it's not a write
 operation

On Mon, Mar 11, 2024 at 08:48:29AM -0700, Darrick J. Wong wrote:
> This change should be a separate patch with its own justification.
> Which is, AFAICT, something along the lines of:
> 
> "Unsharing and zeroing can only happen within EOF, so there is never a
> need to perform posteof pagecache truncation if write begin fails."

Agreed.

> > Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
> 
> Doesn't this patch fix a bug in ext4?

Only with the not yet merged ext4 conversion to iomap for buffered I/O,
which is not merged yet.