linux-kernel - [RFC PATCH 0/3] 9p: Further netfslib-related changes

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Date: Mon, 29 Jan 2024 11:54:34 +0000
From: David Howells <dhowells@...hat.com>
To: Eric Van Hensbergen <ericvh@...nel.org>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Latchesar Ionkov <lucho@...kov.net>
Cc: David Howells <dhowells@...hat.com>,
	Christian Schoenebeck <linux_oss@...debyte.com>,
	Matthew Wilcox <willy@...radead.org>,
	Jeff Layton <jlayton@...nel.org>,
	Christian Brauner <christian@...uner.io>,
	netfs@...ts.linux.dev,
	v9fs@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/3] 9p: Further netfslib-related changes

Hi Eric, Dominique,

Here are some netfslib-related changes we might want to consider applying
to 9p:

 (1) Enable large folio support for 9p.  This is handled entirely by
     netfslib and is already supported in afs.  I wonder if we should limit
     the maximum folio size to 1MiB to match the maximum I/O size in the 9p
     protocol.

 (2) Make better use of netfslib's writethrough caching support by not
     disabling caching for O_DSYNC.  netfs_perform_write() will set up
     and dispatch write requests as it copies data into the pagecache.

 (3) Always update netfs_inode::remote_size to reflect what we think the
     server's idea of the file size is.  This is separate from
     inode::i_size which is our idea of what it should be if all of our
     outstanding dirty data is committed.

The patches can also be found here:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=netfs-9p

Thanks,
David

David Howells (2):
  9p: Make better use of netfslib's writethrough caching
  9p: Always update remote_i_size in stat2inode

Dominique Martinet (1):
  9p: Enable large folio support

 fs/9p/fid.h            | 3 +--
 fs/9p/vfs_inode.c      | 1 +
 fs/9p/vfs_inode_dotl.c | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)