linux-kernel - Re: [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles

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Message-ID: <CAH2r5msHO9HTQGeO6MoR2_U76B9kLeoFS=FRbMuiNsh=YeFdWg@mail.gmail.com>
Date:   Thu, 30 Sep 2021 10:54:32 -0500
From:   Steve French <smfrench@...il.com>
To:     NeilBrown <neilb@...e.de>
Cc:     David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        "Theodore Ts'o" <tytso@....edu>, linux-block@...r.kernel.org,
        ceph-devel <ceph-devel@...r.kernel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Jeff Layton <jlayton@...nel.org>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-mm <linux-mm@...ck.org>, Bob Liu <bob.liu@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        Seth Jennings <sjenning@...ux.vnet.ibm.com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        CIFS <linux-cifs@...r.kernel.org>, Chris Mason <clm@...com>,
        David Sterba <dsterba@...e.com>,
        Minchan Kim <minchan@...nel.org>,
        Steve French <sfrench@...ba.org>,
        Dan Magenheimer <dan.magenheimer@...cle.com>,
        linux-nfs <linux-nfs@...r.kernel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles

On Mon, Sep 27, 2021 at 10:12 PM NeilBrown <neilb@...e.de> wrote:
>
> On Sat, 25 Sep 2021, David Howells wrote:
> > Whilst trying to make this work, I found that NFS's support for swapfiles
> > seems to have been non-functional since Aug 2019 (I think), so the first
> > patch fixes that.  Question is: do we actually *want* to keep this
> > functionality, given that it seems that no one's tested it with an upstream
> > kernel in the last couple of years?
>
> SUSE definitely want to keep this functionality.  We have customers
> using it.
> I agree it would be good if it was being tested somewhere....
>

I am trying to work through the testing of swap over SMB3 mounts
since there are use cases where you need to expand the swap
space to remote storage and so this requirement comes up.  The main difficulty
I run into is forgetting to mount with the mount options (to store mode bits)
(so swap file has the right permissions) and debugging some of the
xfstests relating to swap can be a little confusing.

-- 
Thanks,

Steve