netdev - 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