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

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Message-ID: <59887f65-4a5b-aa96-7646-4c7b79372bf1@huaweicloud.com>
Date: Mon, 17 Jun 2024 17:11:25 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: 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 2024/6/17 14:59, Christoph Hellwig wrote:
> 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.  

Yeah, that's one solution.

> But let's think of that when the need actually arises.
> 

Sure, I will retest and submit only patch 6&8 to solve current issue in my next
version.

Thanks,
Yi.