linux-ext4 - Re: [RFC PATCH V3 07/12] mpage_readpage[s]: Introduce post process callback parameters

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Message-ID: <20180528193437.GC3572@thunk.org>
Date:   Mon, 28 May 2018 15:34:37 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Chandan Rajendra <chandan@...ux.vnet.ibm.com>
Cc:     linux-fscrypt@...r.kernel.org, ebiggers3@...il.com,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH V3 07/12] mpage_readpage[s]: Introduce post process
 callback parameters

On Mon, May 28, 2018 at 11:05:52AM +0530, Chandan Rajendra wrote:
> > Can you describe more of what you are doing here; specifically, you
> > deleted all of fs/ext4/readpage.c --- was this because you moved
> > functionality back into fs/mpage.c?  Did you make sure all of the
> > local changes in fs/ext4/readpage was moved back to fs/mpage.c?
> > 
> > If the goal is to refactor code to remove the need for
> > fs/ext4/readpage.c, you should probably make that be the first patch
> > as a prerequisite patch.  And we then need to make sure we don't
> > accidentally break anyone else who might be using fs/mpage.c.  Saying
> > a bit more about why you think the refactor is a good thing would also
> > be useful.
> 
> I will split this patch into two as suggested by you. Also, I will update 
> the commit messages.

Note that I was planning on making changes to fs/ext4/readpage.c as
part of integrating fsverity[1][2] support into ext4.  Basically, I
need to do something like [3] to fs/ext4/readpage.c.

[1] https://www.spinics.net/lists/linux-fsdevel/msg121182.html
[2] https://www.youtube.com/watch?v=GlEWcVuRbNA
[3] https://git.kernel.org/pub/scm/linux/kernel/git/mhalcrow/linux.git/commit/?h=fs-verity-dev&id=827faba05972517f49fa2f2aaf272150f5766af2

Which is why I'm really interested in your reasoning for why you
propose to drop fs/ext4/readpage.c.  :-)

						- Ted