linux-kernel - Re: [PATCH v4 39/39] 9p: Use netfslib read/write

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Date:   Wed, 13 Dec 2023 16:39:54 +0100
From:   Christian Schoenebeck <linux_oss@...debyte.com>
To:     Jeff Layton <jlayton@...nel.org>,
        Steve French <smfrench@...il.com>,
        David Howells <dhowells@...hat.com>
Cc:     David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Marc Dionne <marc.dionne@...istor.com>,
        Paulo Alcantara <pc@...guebit.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Eric Van Hensbergen <ericvh@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Christian Brauner <christian@...uner.io>,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs@...ts.linux.dev,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Latchesar Ionkov <lucho@...kov.net>
Subject: Re: [PATCH v4 39/39] 9p: Use netfslib read/write_iter

On Wednesday, December 13, 2023 4:23:49 PM CET David Howells wrote:
> Use netfslib's read and write iteration helpers, allowing netfslib to take
> over the management of the page cache for 9p files and to manage local disk
> caching.  In particular, this eliminates write_begin, write_end, writepage
> and all mentions of struct page and struct folio from 9p.
> 
> Note that netfslib now offers the possibility of write-through caching if
> that is desirable for 9p: just set the NETFS_ICTX_WRITETHROUGH flag in
> v9inode->netfs.flags in v9fs_set_netfs_context().
> 
> Note also this is untested as I can't get ganesha.nfsd to correctly parse
> the config to turn on 9p support.

Do you have a chance to test this 9p patch with QEMU instead maybe?

/Christian