linux-ext4 - Re: [RFC PATCH v3 07/26] iomap: don't increase i

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Message-ID: <0b316c9a-b2d7-af02-854e-31430d4f53cd@huaweicloud.com>
Date: Fri, 1 Mar 2024 11:26:40 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Dave Chinner <david@...morbit.com>
Cc: Christoph Hellwig <hch@...radead.org>, djwong@...nel.org,
 linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
 tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
 ritesh.list@...il.com, willy@...radead.org, zokeefe@...gle.com,
 yi.zhang@...wei.com, chengzhihao1@...wei.com, yukuai3@...wei.com,
 wangkefeng.wang@...wei.com
Subject: Re: [RFC PATCH v3 07/26] iomap: don't increase i_size if it's not a
 write operation

On 2024/3/1 7:19, Dave Chinner wrote:
> On Thu, Feb 29, 2024 at 04:59:34PM +0800, Zhang Yi wrote:
>> Hello, Dave!
>>
>> On 2024/2/29 6:25, Dave Chinner wrote:
>>> On Wed, Feb 28, 2024 at 04:53:32PM +0800, Zhang Yi wrote:
>>>> On 2024/2/13 13:46, Christoph Hellwig wrote:
...
> 
> The general solution is to have zeroing of speculative prealloc
> extents beyond EOF simply convert the range to unwritten and then
> invalidate any cached pages over that range. At this point, we are
> guaranteed to have zeroes across that range, all without needing to
> do any IO at all...
> 

Sure, thanks for the explanation, I will try to solve this problem
for xfs first.

Thanks,
Yi.