Re: [PATCH v4 7/9] fs/ntfs3: Add iocharset= mount option as alias for nls=

[Kari Argillander <kari.argillander@gmail.com>]

Choose to add Linus to CC so that he also knows whats coming.

On Sat, Oct 09, 2021 at 01:42:52PM +0200, Pali Rohár wrote:
> Hello!
> 
> This patch have not been applied yet:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/ntfs3/super.c#n247
> 
> What happened that in upstream tree is still only nls= option and not
> this iocharset=?

Very valid question. For some reason Konstantin has not sended pr to
Linus. I have also address my concern that pr is not yet sended and he
will make very massive "patch dumb" to rc6/rc7. See thread [1]. There is
about 50-70 patch already which he will send to rc6/rc7. I have get also
impression that patches which are not yet even applied to ntfs3 tree [2]
will be also sended to rc6/rc7. There is lot of refactoring and new
algorithms which imo are not rc material. I have sended many message to
Konstantin about this topic, but basically ignored.

Basically we do not have anything for next merge window and every patch
will be sended for 5.15.

[1] lore.kernel.org/lkml/20210925082823.fo2wm62xlcexhwvi@kari-VirtualBox
[2] https://github.com/Paragon-Software-Group/linux-ntfs3/commits/master

  Argillander

> 
> On Wednesday 08 September 2021 21:09:38 Pali Rohár wrote:
> > On Tuesday 07 September 2021 18:35:55 Kari Argillander wrote:
> > > Other fs drivers are using iocharset= mount option for specifying charset.
> > > So add it also for ntfs3 and mark old nls= mount option as deprecated.
> > > 
> > > Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
> > 
> > Reviewed-by: Pali Rohár <pali@kernel.org>
> > 
> > > ---
> > >  Documentation/filesystems/ntfs3.rst |  4 ++--
> > >  fs/ntfs3/super.c                    | 18 +++++++++++-------
> > >  2 files changed, 13 insertions(+), 9 deletions(-)
> > > 
> > > diff --git a/Documentation/filesystems/ntfs3.rst b/Documentation/filesystems/ntfs3.rst
> > > index af7158de6fde..ded706474825 100644
> > > --- a/Documentation/filesystems/ntfs3.rst
> > > +++ b/Documentation/filesystems/ntfs3.rst
> > > @@ -32,12 +32,12 @@ generic ones.
> > >  
> > >  ===============================================================================
> > >  
> > > -nls=name		This option informs the driver how to interpret path
> > > +iocharset=name		This option informs the driver how to interpret path
> > >  			strings and translate them to Unicode and back. If
> > >  			this option is not set, the default codepage will be
> > >  			used (CONFIG_NLS_DEFAULT).
> > >  			Examples:
> > > -				'nls=utf8'
> > > +				'iocharset=utf8'
> > >  
> > >  uid=
> > >  gid=
> > > diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> > > index 729ead6f2fac..503e2e23f711 100644
> > > --- a/fs/ntfs3/super.c
> > > +++ b/fs/ntfs3/super.c
> > > @@ -226,7 +226,7 @@ enum Opt {
> > >  	Opt_nohidden,
> > >  	Opt_showmeta,
> > >  	Opt_acl,
> > > -	Opt_nls,
> > > +	Opt_iocharset,
> > >  	Opt_prealloc,
> > >  	Opt_no_acs_rules,
> > >  	Opt_err,
> > > @@ -245,9 +245,13 @@ static const struct fs_parameter_spec ntfs_fs_parameters[] = {
> > >  	fsparam_flag_no("hidden",		Opt_nohidden),
> > >  	fsparam_flag_no("acl",			Opt_acl),
> > >  	fsparam_flag_no("showmeta",		Opt_showmeta),
> > > -	fsparam_string("nls",			Opt_nls),
> > >  	fsparam_flag_no("prealloc",		Opt_prealloc),
> > >  	fsparam_flag("no_acs_rules",		Opt_no_acs_rules),
> > > +	fsparam_string("iocharset",		Opt_iocharset),
> > > +
> > > +	__fsparam(fs_param_is_string,
> > > +		  "nls", Opt_iocharset,
> > > +		  fs_param_deprecated, NULL),
> > >  	{}
> > >  };
> > >  
> > > @@ -346,7 +350,7 @@ static int ntfs_fs_parse_param(struct fs_context *fc,
> > >  	case Opt_showmeta:
> > >  		opts->showmeta = result.negated ? 0 : 1;
> > >  		break;
> > > -	case Opt_nls:
> > > +	case Opt_iocharset:
> > >  		kfree(opts->nls_name);
> > >  		opts->nls_name = param->string;
> > >  		param->string = NULL;
> > > @@ -380,11 +384,11 @@ static int ntfs_fs_reconfigure(struct fs_context *fc)
> > >  	new_opts->nls = ntfs_load_nls(new_opts->nls_name);
> > >  	if (IS_ERR(new_opts->nls)) {
> > >  		new_opts->nls = NULL;
> > > -		errorf(fc, "ntfs3: Cannot load nls %s", new_opts->nls_name);
> > > +		errorf(fc, "ntfs3: Cannot load iocharset %s", new_opts->nls_name);
> > >  		return -EINVAL;
> > >  	}
> > >  	if (new_opts->nls != sbi->options->nls)
> > > -		return invalf(fc, "ntfs3: Cannot use different nls when remounting!");
> > > +		return invalf(fc, "ntfs3: Cannot use different iocharset when remounting!");
> > >  
> > >  	sync_filesystem(sb);
> > >  
> > > @@ -528,9 +532,9 @@ static int ntfs_show_options(struct seq_file *m, struct dentry *root)
> > >  	if (opts->dmask)
> > >  		seq_printf(m, ",dmask=%04o", ~opts->fs_dmask_inv);
> > >  	if (opts->nls)
> > > -		seq_printf(m, ",nls=%s", opts->nls->charset);
> > > +		seq_printf(m, ",iocharset=%s", opts->nls->charset);
> > >  	else
> > > -		seq_puts(m, ",nls=utf8");
> > > +		seq_puts(m, ",iocharset=utf8");
> > >  	if (opts->sys_immutable)
> > >  		seq_puts(m, ",sys_immutable");
> > >  	if (opts->discard)
> > > -- 
> > > 2.25.1
> > >