linux-ext4 - Re: [PATCH v4 1/8] ext4: move out iomap field population into separate helper

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Message-ID: <20191009090903.GA2125@poseidon.bobrowski.net>
Date:   Wed, 9 Oct 2019 20:09:05 +1100
From:   Matthew Bobrowski <mbobrowski@...browski.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     Christoph Hellwig <hch@...radead.org>, tytso@....edu, jack@...e.cz,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, david@...morbit.com,
        darrick.wong@...cle.com
Subject: Re: [PATCH v4 1/8] ext4: move out iomap field population into
 separate helper

On Wed, Oct 09, 2019 at 01:20:17PM +0530, Ritesh Harjani wrote:
> On 10/9/19 12:37 PM, Christoph Hellwig wrote:
> > On Wed, Oct 09, 2019 at 11:32:54AM +0530, Ritesh Harjani wrote:
> > > We can also get rid of "first_block" argument here.
> > 
> > That would just duplicate filling it out in all callers, so why?
> > 
> 
> What I meant is "first_block" is same as map->m_lblk.
> (unless ext4_map_blocks can change map->m_lblk, which AFAICT, it should
> not).
> So why pass an extra argument when we are already passing 'map'
> structure.
> So we can fill iomap->offset using map->m_lblk in ext4_set_iomap()
> function.

What you're saying makes sense Ritesh and I will update it as such. I
believe what Christoph was actually referring to was what I explained
to Jan to the email that I just sent out. This was around the possible
code duplication and having some iomap value setting related logic
outside ext4_set_iomap(), when in fact there's no real reason why it
can't be inside.

--<M>--