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Date:   Thu, 20 Jul 2023 23:57:01 +0000
From:   "Dr. David Alan Gilbert" <linux@treblig.org>
To:     Tom Talpey <tom@talpey.com>
Cc:     Dave Kleikamp <dave.kleikamp@oracle.com>,
        Steve French <smfrench@gmail.com>, linkinjeon@kernel.org,
        shaggy@kernel.org, linux-cifs@vger.kernel.org,
        krisman@collabora.com, jfs-discussion@lists.sourceforge.net,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/4] dedupe smb unicode files
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* Tom Talpey (tom@talpey.com) wrote:
> On 7/19/2023 6:06 PM, Dave Kleikamp wrote:
> > On 7/19/23 4:58PM, Dr. David Alan Gilbert wrote:
> > > * Steve French (smfrench@gmail.com) wrote:
> > > > The related question is which tree to send it from, if no problems
> > > > reported (presumably mine since it mostly affect cifs.ko and ksmbd.ko,
> > > > and because there hasn't been activity in fs/nls for years)
> > > 
> > > That was my hope, given that ~half of the patches are directly on that
> > > code, and it's the only very active tree this touches as far as I can
> > > tell.
> > > 
> > > > On Wed, Jul 19, 2023 at 12:56 PM Steve French
> > > > <smfrench@gmail.com> wrote:
> > > > > 
> > > > > No objections to this on my part.  If Shaggy is ok with the JFS
> > > > > change, we could target it for 6.6-rc1 if it tests out ok
> > 
> > For the series:
> > Reviewed-by: Dave Kleikamp <dave.kleikamp@oracle.com>
> > 
> > Steve,
> > Feel free to pull in even the 4th patch into your tree with my consent.
> > Or if you're more comfortable, I could submit it after yours hits
> > mainline.
> > 
> > Shaggy
> 
> The changes look good to me but there is one quirk with the
> copyrights and SPDX in patch 2.
> 
> In the new fs/nls/nls_ucs2_utils.c, the SPDX line changes from
> a "/* ... */" form to "// ...", which may be a proper update, but
> then partway down, adds the same SPDX in "/* ... */ form. These
> should at least be consistent.
> 
> > +++ b/fs/nls/nls_ucs2_utils.c
> > @@ -1,19 +1,25 @@
> > -/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> 
> vs
> 
> > +++ b/fs/nls/nls_ucs2_utils.h
> > @@ -0,0 +1,297 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */

Yeh that's an easy fix - so that's just the fact the .h has
the older /* where I'd fixed up the .c ?

> Second, the copyright in fs/nls/nls_ucs2_utils.c is a bit of
> a mash-up (adding 2009 especially).
> 
> I think it's better to keep the exact text of both copyrights,
> perhaps with a note as to which files had them previously, and
> adding some new note/blank line to separate the recent contributions
> from Namjae and you from the ancient history.

How about the following;

 * This file has taken chunks from a few other files
 * smb/server/uniupr.h had the declaration:
 *
 *   Some of the source code in this file came from fs/cifs/uniupr.h
 *   Copyright (c) International Business Machines  Corp., 2000,2002
 *
 * fs/smb/server/unicode.c had the declaration:
 *
 *   Some of the source code in this file came from fs/cifs/cifs_unicode.c
 *
 *   Copyright (c) International Business Machines  Corp., 2000,2009
 *   Modified by Steve French (sfrench@us.ibm.com)
 *   Modified by Namjae Jeon (linkinjeon@kernel.org)
 *

I haven't added the extra line above Namjae's line, since it's now
a straight copy from the unicode.c entry.
I'm not particularly fussed about adding my own line unless you think
it's needed; git keeps better history!

> > +++ b/fs/nls/nls_ucs2_utils.c
> > ...
> > - *   Some of the source code in this file came from fs/cifs/uniupr.h
> > - *   Copyright (c) International Business Machines  Corp., 2000,2002
> > - *
> > - * uniupr.h - Unicode compressed case ranges
> > + *   Some of the source code in this file came from fs/cifs/cifs_unicode.c
> > + *   via fs/smb/unicode.c and fs/smb/uniupr.h and fs/cifs/uniupr.h
> > + *   Copyright (c) International Business Machines  Corp., 2000,2002,2009
> > + *   Modified by Steve French (sfrench@us.ibm.com)
> > + *   Modified by Namjae Jeon (linkinjeon@kernel.org)
> > + *   Modified by Dr. David Alan Gilbert <linux@treblig.org>
> 
> Apart from considering these:
> 
> Reviewed-by: Tom Talpey <tom@talpey.com>

Thanks!

Dave

> Nice work!
> 
> > > 
> > > Thanks.
> > > 
> > > Dave
> > > 
> > > > > On Wed, Jul 12, 2023 at 6:28 PM Dr. David Alan Gilbert
> > > > > <dave@treblig.org> wrote:
> > > > > > 
> > > > > > * linux@treblig.org (linux@treblig.org) wrote:
> > > > > > > From: "Dr. David Alan Gilbert" <linux@treblig.org>
> > > > > > > 
> > > > > > > The smb client and server code have (mostly) duplicated code
> > > > > > > for unicode manipulation, in particular upper case handling.
> > > > > > > 
> > > > > > > Flatten this lot into shared code.
> > > > > > 
> > > > > > Gentle two week ping on this please.
> > > > > > 
> > > > > > Dave
> > > > > > 
> > > > > > (Apologies to the 3 of you who already got a copy of this ping,
> > > > > > recent due to a missing header ',' )
> > > > > > 
> > > > > > > There's some code that's slightly different between the two, and
> > > > > > > I've not attempted to share that - this should be strictly a no
> > > > > > > behaviour change set.
> > > > > > > 
> > > > > > > In addition, the same tables and code are shared in jfs, however
> > > > > > > there's very little testing available for the unicode in there,
> > > > > > > so just share the raw data tables.
> > > > > > > 
> > > > > > > I suspect there's more UCS-2 code that can be shared, in the NLS code
> > > > > > > and in the UCS-2 code used by the EFI interfaces.
> > > > > > > 
> > > > > > > Lightly tested with a module and a monolithic build,
> > > > > > > and just mounting
> > > > > > > itself.
> > > > > > > 
> > > > > > > This dupe was found using PMD:
> > > > > > >    https://pmd.github.io/pmd/pmd_userdocs_cpd.html
> > > > > > > 
> > > > > > > Dave
> > > > > > > 
> > > > > > > Version 2
> > > > > > >    Moved the shared code to fs/nls after v1 feedback.
> > > > > > >    Renamed shared tables from Smb to Nls prefix
> > > > > > >    Move UniStrcat as well
> > > > > > >    Share the JFS tables
> > > > > > > 
> > > > > > > Dr. David Alan Gilbert (4):
> > > > > > >    fs/smb: Remove unicode 'lower' tables
> > > > > > >    fs/smb: Swing unicode common code from smb->NLS
> > > > > > >    fs/smb/client: Use common code in client
> > > > > > >    fs/jfs: Use common ucs2 upper case table
> > > > > > > 
> > > > > > >   fs/jfs/Kconfig               |   1 +
> > > > > > >   fs/jfs/Makefile              |   2 +-
> > > > > > >   fs/jfs/jfs_unicode.h         |  17 +-
> > > > > > >   fs/jfs/jfs_uniupr.c          | 121 -------------
> > > > > > >   fs/nls/Kconfig               |   8 +
> > > > > > >   fs/nls/Makefile              |   1 +
> > > > > > >   fs/nls/nls_ucs2_data.h       |  15 ++
> > > > > > >   fs/nls/nls_ucs2_utils.c      | 144 +++++++++++++++
> > > > > > >   fs/nls/nls_ucs2_utils.h      | 285 ++++++++++++++++++++++++++++++
> > > > > > >   fs/smb/client/Kconfig        |   1 +
> > > > > > >   fs/smb/client/cifs_unicode.c |   1 -
> > > > > > >   fs/smb/client/cifs_unicode.h | 330
> > > > > > > +----------------------------------
> > > > > > >   fs/smb/client/cifs_uniupr.h  | 239 -------------------------
> > > > > > >   fs/smb/server/Kconfig        |   1 +
> > > > > > >   fs/smb/server/unicode.c      |   1 -
> > > > > > >   fs/smb/server/unicode.h      | 325
> > > > > > > +---------------------------------
> > > > > > >   fs/smb/server/uniupr.h       | 268 ----------------------------
> > > > > > >   17 files changed, 467 insertions(+), 1293 deletions(-)
> > > > > > >   delete mode 100644 fs/jfs/jfs_uniupr.c
> > > > > > >   create mode 100644 fs/nls/nls_ucs2_data.h
> > > > > > >   create mode 100644 fs/nls/nls_ucs2_utils.c
> > > > > > >   create mode 100644 fs/nls/nls_ucs2_utils.h
> > > > > > >   delete mode 100644 fs/smb/client/cifs_uniupr.h
> > > > > > >   delete mode 100644 fs/smb/server/uniupr.h
> > > > > > > 
> > > > > > > -- 
> > > > > > > 2.41.0
> > > > > > > 
> > > > > > -- 
> > > > > >   -----Open up your eyes, open up your mind, open up your code -------
> > > > > > / Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \
> > > > > > \        dave @ treblig.org |                               | In Hex /
> > > > > >   \ _________________________|_____ http://www.treblig.org   |_______/
> > > > > 
> > > > > 
> > > > > 
> > > > > -- 
> > > > > Thanks,
> > > > > 
> > > > > Steve
> > > > 
> > > > 
> > > > 
> > > > -- 
> > > > Thanks,
> > > > 
> > > > Steve
> > 
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\        dave @ treblig.org |                               | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/