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

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Date:   Wed, 8 Sep 2021 21:09:38 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Kari Argillander <kari.argillander@...il.com>
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        ntfs3@...ts.linux.dev, Christoph Hellwig <hch@....de>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: Re: [PATCH v4 7/9] fs/ntfs3: Add iocharset= mount option as alias
 for nls=

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@...il.com>

Reviewed-by: Pali Rohár <pali@...nel.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
>