linux-kernel - Re: [RFC PATCH 05/20] ntfs: Undeprecate iocharset= mount option

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Message-ID: <20210819102342.6ps7lowpuomyqcdk@kari-VirtualBox>
Date:   Thu, 19 Aug 2021 13:23:42 +0300
From:   Kari Argillander <kari.argillander@...il.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net, linux-cifs@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jan Kara <jack@...e.cz>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Luis de Bethencourt <luisbg@...nel.org>,
        Salah Triki <salah.triki@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Kleikamp <shaggy@...nel.org>,
        Anton Altaparmakov <anton@...era.com>,
        Pavel Machek <pavel@....cz>,
        Marek Behún <marek.behun@....cz>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC PATCH 05/20] ntfs: Undeprecate iocharset= mount option

On Thu, Aug 19, 2021 at 10:12:22AM +0200, Pali Rohár wrote:
> On Thursday 19 August 2021 04:21:08 Kari Argillander wrote:
> > On Sun, Aug 08, 2021 at 06:24:38PM +0200, Pali Rohár wrote:
> > > Other fs drivers are using iocharset= mount option for specifying charset.
> > > So mark iocharset= mount option as preferred and deprecate nls= mount
> > > option.
> >  
> > One idea is also make this change to fs/fc_parser.c and then when we
> > want we can drop support from all filesystem same time. This way we
> > can get more deprecated code off the fs drivers. Draw back is that
> > then every filesstem has this deprecated nls= option if it support
> > iocharsets option. But that should imo be ok.
> 
> Beware that iocharset= is required only for fs which store filenames in
> some specific encoding (in this case extension to UTF-16). For fs which
> store filenames in raw bytes this option should not be parsed at all.

Yeah of course. I was thinking that what we do is that if key is nls=
we change key to iocharset, print deprecated and then send it to driver
parser as usual. This way driver parser will never know that user
specifie nls= because it just get iocharset. But this is probebly too
fancy way to think simple problem. Just idea. 

> Therefore I'm not sure if this parsing should be in global
> fs/fc_parser.c file...