linux-kernel - Re: [PATCH v14 089/138] mm/filemap: Add FGP

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Message-ID: <1815220.1628633242@warthog.procyon.org.uk>
Date:   Tue, 10 Aug 2021 23:07:22 +0100
From:   David Howells <dhowells@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v14 089/138] mm/filemap: Add FGP_STABLE

Matthew Wilcox (Oracle) <willy@...radead.org> wrote:

> Allow filemap_get_folio() to wait for writeback to complete (if the
> filesystem wants that behaviour).  This is the folio equivalent of
> grab_cache_page_write_begin(), which is moved into the folio-compat
> file as a reminder to migrate all the code using it.  This paves the
> way for getting rid of AOP_FLAG_NOFS once grab_cache_page_write_begin()
> is removed.
> 
> Kernel grows by 11 bytes.  filemap_get_folio() grows by 33 bytes but
> grab_cache_page_write_begin() shrinks by 22 bytes to make up for it.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>

Reviewed-by: David Howells <dhowells@...hat.com>