linux-kernel - Re: [PATCH v2 03/10] ext4: drop ext4_update_disksize_before

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Message-ID: <20240924101119.xzejk3a2rjmgqed7@quack3>
Date: Tue, 24 Sep 2024 12:11:19 +0200
From: Jan Kara <jack@...e.cz>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	tytso@....edu, adilger.kernel@...ger.ca, ritesh.list@...il.com,
	yi.zhang@...wei.com, chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH v2 03/10] ext4: drop ext4_update_disksize_before_punch()

On Tue 24-09-24 15:43:22, Zhang Yi wrote:
> On 2024/9/21 0:13, Jan Kara wrote:
> > On Wed 04-09-24 14:29:18, Zhang Yi wrote:
> >> From: Zhang Yi <yi.zhang@...wei.com>
> >>
> >> Since we always write back dirty data before zeroing range and punching
> >> hole, the delalloc extended file's disksize of should be updated
> >> properly when writing back pages, hence we don't need to update file's
> >> disksize before discarding page cache in ext4_zero_range() and
> >> ext4_punch_hole(), just drop ext4_update_disksize_before_punch().
> >>
> >> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
> > 
> > So when we don't write out before hole punching & company this needs to stay
> > in some shape or form. 
> > 
> 
> Thanks for taking time to review this series!
> 
> I don't fully understand this comment, please let me confirm. Do you
> suggested that we still don't write out all the data before punching /
> zeroing / collapseing(i.e. drop patch 01), so we need to keep
> ext4_update_disksize_before_punch()(i.e. also drop this patch), is
> that right?

Yes, this is what I meant. Sorry for not being clear.

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR