linux-ext4 - Re: [RFC v3 4/7] iomap: Add iomap_folio

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Message-ID: <Y6gUAtg4MZC2ZG6v@casper.infradead.org>
Date:   Sun, 25 Dec 2022 09:12:34 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Andreas Grünbacher 
        <andreas.gruenbacher@...il.com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, cluster-devel@...hat.com
Subject: Re: [RFC v3 4/7] iomap: Add iomap_folio_prepare helper

On Fri, Dec 23, 2022 at 11:23:34PM -0800, Christoph Hellwig wrote:
> On Fri, Dec 23, 2022 at 10:05:05PM +0100, Andreas Grünbacher wrote:
> > > I'd name this __iomap_get_folio to match __filemap_get_folio.
> > 
> > I was looking at it from the filesystem point of view: this helper is
> > meant to be used in ->folio_prepare() handlers, so
> > iomap_folio_prepare() seemed to be a better name than
> > __iomap_get_folio().
> 
> Well, I think the right name for the methods that gets a folio is
> probably ->folio_get anyway.

For the a_ops, the convention I've been following is:

folio_mark_dirty()
 -> aops->dirty_folio()
   -> iomap_dirty_folio()

ie VERB_folio() as the name of the operation, and MODULE_VERB_folio()
as the implementation.  Seems to work pretty well.