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

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Date: Sun, 16 Jun 2024 23:59:26 -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 Sat, Jun 15, 2024 at 07:44:21PM +0800, Zhang Yi wrote:
> The reason why atomic feature can't split and convert the tail extent on truncate
> down now is the dio write iter loop will split an atomic dio which covers the
> whole allocation unit(extsize) since there are two extents in on allocation unit.

We could fix this by merging the two in iomap_begin, as the end_io
handler already deals with multiple ranges.  But let's think of that
when the need actually arises.