linux-kernel - Re: [PATCH -next v5 7/8] xfs: speed up truncating down a big realtime inode

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Date: Fri, 14 Jun 2024 02:13:30 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: Christoph Hellwig <hch@...radead.org>, linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	djwong@...nel.org, brauner@...nel.org, david@...morbit.com,
	chandanbabu@...nel.org, jack@...e.cz, yi.zhang@...wei.com,
	chengzhihao1@...wei.com, yukuai3@...wei.com,
	John Garry <john.g.garry@...cle.com>
Subject: Re: [PATCH -next v5 7/8] xfs: speed up truncating down a big
 realtime inode

On Fri, Jun 14, 2024 at 03:18:07PM +0800, Zhang Yi wrote:
> Thanks for your suggestion.
> 
> Yeah, we could fix the realtime inode problem by just drop this part, but
> for the upcoming forcealign feature and atomic feature by John, IIUC, we
> couldn't split and convert the tail extent like RT inode does, we should
> zero out the entire tail force aligned extent, if not, atomic write could
> be broken by submitting unaligned bios.

Let's worry about that if/when those actually land.  I also see no
rason why those couldn't just use partially convert to unwritten path
offhand (but without having looked into the details).