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Message-ID: <Yuwq0kUJMTAX6F4m@casper.infradead.org>
Date: Thu, 4 Aug 2022 21:23:46 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Jeff Layton <jlayton@...nel.org>
Cc: Enzo Matsumiya <ematsumiya@...e.de>, Tom Talpey <tom@...pey.com>,
linux-cifs@...r.kernel.org, smfrench@...il.com, pc@....nz,
ronniesahlberg@...il.com, nspmangalore@...il.com,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
samba-technical@...ts.samba.org, pshilovsky@...ba.org
Subject: Re: [RFC PATCH 0/3] Rename "cifs" module to "smbfs"
On Thu, Aug 04, 2022 at 03:03:23PM -0400, Jeff Layton wrote:
> On Tue, 2022-08-02 at 22:56 -0300, Enzo Matsumiya wrote:
> > On 08/02, Tom Talpey wrote:
> > > The initial goal is to modularize the SMB1 code, so it can be completely
> > > removed from a running system. The extensive refactoring logically leads
> > > to this directory renaming, but renaming is basically a side effect.
> > >
>
> This is a great technical goal. Splitting up cifs.ko into smaller
> modules would be great, in addition to being able to turn off smb1
> support.
I don't know the CIFS module that well. How do you see it being split
up? It's #4 in the list of filesystems:
$ size /lib/modules/5.18.0-3-amd64/kernel/fs/*/*.ko |sort -n |tail
369020 28460 132 397612 6112c /lib/modules/5.18.0-3-amd64/kernel/fs/ubifs/ubifs.ko
395793 50398 960 447151 6d2af /lib/modules/5.18.0-3-amd64/kernel/fs/ceph/ceph.ko
477909 58883 10512 547304 859e8 /lib/modules/5.18.0-3-amd64/kernel/fs/nfsd/nfsd.ko
609260 84848 640 694748 a99dc /lib/modules/5.18.0-3-amd64/kernel/fs/f2fs/f2fs.ko
622638 252078 1008 875724 d5ccc /lib/modules/5.18.0-3-amd64/kernel/fs/nfs/nfsv4.ko
717343 111314 1176 829833 ca989 /lib/modules/5.18.0-3-amd64/kernel/fs/ext4/ext4.ko
884247 206051 504 1090802 10a4f2 /lib/modules/5.18.0-3-amd64/kernel/fs/cifs/cifs.ko
890155 159520 240 1049915 10053b /lib/modules/5.18.0-3-amd64/kernel/fs/ocfs2/ocfs2.ko
1193834 274148 456 1468438 166816 /lib/modules/5.18.0-3-amd64/kernel/fs/xfs/xfs.ko
1393088 126501 15072 1534661 176ac5 /lib/modules/5.18.0-3-amd64/kernel/fs/btrfs/btrfs.ko
... but if you look at how NFS is split up:
311322 76200 392 387914 5eb4a /lib/modules/5.18.0-3-amd64/kernel/fs/nfs/nfs.ko
25157 1100 72 26329 66d9 /lib/modules/5.18.0-3-amd64/kernel/fs/nfs/nfsv2.ko
49332 1544 120 50996 c734 /lib/modules/5.18.0-3-amd64/kernel/fs/nfs/nfsv3.ko
622638 252078 1008 875724 d5ccc /lib/modules/5.18.0-3-amd64/kernel/fs/nfs/nfsv4.ko
you can save a lot of RAM if you don't need NFSv4 (then there's also
nfs_common, 408kB of sunrpc.ko, etc, etc).
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