linux-kernel - Re: [RFC PATCH] f2fs: Convert f2fs_write_cache_pages() to use filemap_get_folios

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Message-ID: <Y6Vh3iu1xD7jgF9/@infradead.org>
Date:   Fri, 23 Dec 2022 00:07:58 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Vishal Moola <vishal.moola@...il.com>
Cc:     Matthew Wilcox <willy@...radead.org>, Chao Yu <chao@...nel.org>,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-mm@...ck.org,
        fengnanchang@...il.com, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH] f2fs: Convert f2fs_write_cache_pages() to use
 filemap_get_folios_tag()

On Wed, Dec 21, 2022 at 09:17:30AM -0800, Vishal Moola wrote:
> > That said, folio_ref_inct() is very much MM-internal and filesystems
> > should be using folio_get(), so please make that modification in the
> > next revision, Vishal.
> 
> Ok, I'll go through and fix all of those in the next version.

Btw, something a lot more productive in this area would be to figure out
how we could convert all these copy and paste versions of
write_cache_pages to use common code.  This might need changes to the
common code, but the amount of duplicate and poorly maintained versions
of this loop is a bit alarming:

 - btree_write_cache_pages
 - extent_write_cache_pages
 - f2fs_write_cache_pages
 - gfs2_write_cache_jdata