linux-kernel - Re: [Jfs-discussion] [PATCH 0/3] dedupe smb unicode files

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Date:   Wed, 28 Jun 2023 09:17:15 -0500
From:   Dave Kleikamp <dave.kleikamp@...cle.com>
To:     "Dr. David Alan Gilbert" <linux@...blig.org>,
        Tom Talpey <tom@...pey.com>
Cc:     sfrench@...ba.org, linux-cifs@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net, linkinjeon@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Jfs-discussion] [PATCH 0/3] dedupe smb unicode files

On 6/28/23 8:46AM, Dr. David Alan Gilbert wrote:
> * Dr. David Alan Gilbert (dave@...blig.org) wrote:
>> * Tom Talpey (tom@...pey.com) wrote:
>>> On 6/27/2023 9:14 PM, linux@...blig.org wrote:
>>>> From: "Dr. David Alan Gilbert" <linux@...blig.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.
>>>>
>>>> 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.
>>>>
>>>> I'd love to also boil out the same code from fs/jfs/ - but that's
>>>> a thought for another time (and harder since there's no good test
>>>> for it).
>>>>
>>>> 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
>>>>
>>>> Dr. David Alan Gilbert (3):
>>>>     fs/smb: Remove unicode 'lower' tables
>>>>     fs/smb: Swing unicode common code from server->common
>>>>     fs/smb/client: Use common code in client
>>>>
>>>>    fs/smb/client/cifs_unicode.c                  |   1 -
>>>>    fs/smb/client/cifs_unicode.h                  | 313 +-----------------
>>>>    fs/smb/client/cifs_uniupr.h                   | 239 -------------
>>>>    fs/smb/common/Makefile                        |   1 +
>>>>    .../uniupr.h => common/cifs_unicode_common.c} | 156 +--------
>>>>    fs/smb/common/cifs_unicode_common.h           | 279 ++++++++++++++++
>>>
>>> So far so good, but please drop the "cifs_" prefix from this new file's
>>> name, since its contents apply to later smb dialects as well.
>>
>> Sure.
> 
> Actually, would you be ok with smb_unicode_common ?  The reason is that
> you end up with a module named unicode_common  that sounds too generic.

A bit off topic, but a question for Steve.

Is there a need for separate modules under fs/smb/common/? Or could the 
makefile do something like:

obj-$(CONFIG_SMBFS) += smb_common.o

smb_common-y := cifs.arc4.o cifs_md4.o smb_unicode.o

Shaggy

> 
> Dave
> 
>> Dave
>>
>>> Tom.
>>>
>>>>    fs/smb/server/unicode.c                       |   1 -
>>>>    fs/smb/server/unicode.h                       | 301 +----------------
>>>>    8 files changed, 298 insertions(+), 993 deletions(-)
>>>>    delete mode 100644 fs/smb/client/cifs_uniupr.h
>>>>    rename fs/smb/{server/uniupr.h => common/cifs_unicode_common.c} (50%)
>>>>    create mode 100644 fs/smb/common/cifs_unicode_common.h
>>>>
>> -- 
>>   -----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   |_______/