Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley
        Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United
        Kingdom.
        Registered in England and Wales under Company Registration No. 3798903
From:   David Howells <dhowells@redhat.com>
In-Reply-To: <YW7uN2p8CihCDsln@moria.home.lan>
References: <YW7uN2p8CihCDsln@moria.home.lan> <YUfvK3h8w+MmirDF@casper.infradead.org> <YUo20TzAlqz8Tceg@cmpxchg.org> <YUpC3oV4II+u+lzQ@casper.infradead.org> <YUpKbWDYqRB6eBV+@moria.home.lan> <YUpNLtlbNwdjTko0@moria.home.lan> <YUtHCle/giwHvLN1@cmpxchg.org> <YWpG1xlPbm7Jpf2b@casper.infradead.org> <YW2lKcqwBZGDCz6T@cmpxchg.org> <YW25EDqynlKU14hx@moria.home.lan> <YW3dByBWM0dSRw/X@cmpxchg.org>
To:     Kent Overstreet <kent.overstreet@gmail.com>
Cc:     dhowells@redhat.com, Johannes Weiner <hannes@cmpxchg.org>,
        Matthew Wilcox <willy@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        "Darrick J. Wong" <djwong@kernel.org>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: Splitting struct page into multiple types - Was: re: Folio discussion recap -
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <2981361.1634678044.1@warthog.procyon.org.uk>
Content-Transfer-Encoding: quoted-printable
Date:   Tue, 19 Oct 2021 22:14:04 +0100
Message-ID: <2981362.1634678044@warthog.procyon.org.uk>
Precedence: bulk

Kent Overstreet <kent.overstreet@gmail.com> wrote:

> =

>  - page->lru is used by the old .readpages interface for the list of pag=
es we're
>    doing reads to; Matthew converted most filesystems to his new and imp=
roved
>    .readahead which thankfully no longer uses page->lru, but there's sti=
ll a few
>    filesystems that need to be converted - it looks like cifs and erofs,=
 not
>    sure what's going on with fs/cachefiles/. We need help from the maint=
ainers
>    of those filesystems to get that conversion done, this is holding up =
future
>    cleanups.

fscache and cachefiles should be taken care of by my patchset here:

	https://lore.kernel.org/r/163363935000.1980952.15279841414072653108.stgit=
@warthog.procyon.org.uk
	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log=
/?h=3Dfscache-remove-old-io

With that 9p, afs and ceph use netfs lib to handle readpage, readahead and
part of write_begin.

nfs and cifs do their own wrangling of readpages/readahead, but will call =
out
to the cache directly to handle each page individually.  At some point, ci=
fs
will hopefully be converted to use netfs lib.

David