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Date:   Thu, 12 Aug 2021 16:17:36 +0200
From:   Jan Kara <jack@suse.cz>
To:     Pali =?iso-8859-1?Q?Roh=E1r?= <pali@kernel.org>
Cc:     linux-fsdevel@vger.kernel.org,
        linux-ntfs-dev@lists.sourceforge.net, linux-cifs@vger.kernel.org,
        jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jan Kara <jack@suse.cz>,
        OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
        "Theodore Y . Ts'o" <tytso@mit.edu>,
        Luis de Bethencourt <luisbg@kernel.org>,
        Salah Triki <salah.triki@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dave Kleikamp <shaggy@kernel.org>,
        Anton Altaparmakov <anton@tuxera.com>,
        Pavel Machek <pavel@ucw.cz>,
        Marek =?iso-8859-1?Q?Beh=FAn?= <marek.behun@nic.cz>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFC PATCH 03/20] udf: Fix iocharset=utf8 mount option
Message-ID: <20210812141736.GE14675@quack2.suse.cz>
References: <20210808162453.1653-1-pali@kernel.org>
 <20210808162453.1653-4-pali@kernel.org>
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On Sun 08-08-21 18:24:36, Pali Roh?r wrote:
> Currently iocharset=utf8 mount option is broken. To use UTF-8 as iocharset,
> it is required to use utf8 mount option.
> 
> Fix iocharset=utf8 mount option to use be equivalent to the utf8 mount
> option.
> 
> If UTF-8 as iocharset is used then s_nls_map is set to NULL. So simplify
> code around, remove UDF_FLAG_NLS_MAP and UDF_FLAG_UTF8 flags as to
> distinguish between UTF-8 and non-UTF-8 it is needed just to check if
> s_nls_map set to NULL or not.
> 
> Signed-off-by: Pali Roh?r <pali@kernel.org>

Thanks for the cleanup. It looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

Or should I take this patch through my tree?

								Honza


> ---
>  fs/udf/super.c   | 50 ++++++++++++++++++------------------------------
>  fs/udf/udf_sb.h  |  2 --
>  fs/udf/unicode.c |  4 ++--
>  3 files changed, 21 insertions(+), 35 deletions(-)
> 
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index 2f83c1204e20..6e8c29107b04 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -349,10 +349,10 @@ static int udf_show_options(struct seq_file *seq, struct dentry *root)
>  		seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
>  	if (sbi->s_anchor != 0)
>  		seq_printf(seq, ",anchor=%u", sbi->s_anchor);
> -	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
> -		seq_puts(seq, ",utf8");
> -	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
> +	if (sbi->s_nls_map)
>  		seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
> +	else
> +		seq_puts(seq, ",iocharset=utf8");
>  
>  	return 0;
>  }
> @@ -558,19 +558,24 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
>  			/* Ignored (never implemented properly) */
>  			break;
>  		case Opt_utf8:
> -			uopt->flags |= (1 << UDF_FLAG_UTF8);
> +			if (!remount) {
> +				unload_nls(uopt->nls_map);
> +				uopt->nls_map = NULL;
> +			}
>  			break;
>  		case Opt_iocharset:
>  			if (!remount) {
> -				if (uopt->nls_map)
> -					unload_nls(uopt->nls_map);
> -				/*
> -				 * load_nls() failure is handled later in
> -				 * udf_fill_super() after all options are
> -				 * parsed.
> -				 */
> +				unload_nls(uopt->nls_map);
> +				uopt->nls_map = NULL;
> +			}
> +			/* When nls_map is not loaded then UTF-8 is used */
> +			if (!remount && strcmp(args[0].from, "utf8") != 0) {
>  				uopt->nls_map = load_nls(args[0].from);
> -				uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
> +				if (!uopt->nls_map) {
> +					pr_err("iocharset %s not found\n",
> +						args[0].from);
> +					return 0;
> +				}
>  			}
>  			break;
>  		case Opt_uforget:
> @@ -2139,21 +2144,6 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
>  	if (!udf_parse_options((char *)options, &uopt, false))
>  		goto parse_options_failure;
>  
> -	if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
> -	    uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
> -		udf_err(sb, "utf8 cannot be combined with iocharset\n");
> -		goto parse_options_failure;
> -	}
> -	if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
> -		uopt.nls_map = load_nls_default();
> -		if (!uopt.nls_map)
> -			uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
> -		else
> -			udf_debug("Using default NLS map\n");
> -	}
> -	if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
> -		uopt.flags |= (1 << UDF_FLAG_UTF8);
> -
>  	fileset.logicalBlockNum = 0xFFFFFFFF;
>  	fileset.partitionReferenceNum = 0xFFFF;
>  
> @@ -2308,8 +2298,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
>  error_out:
>  	iput(sbi->s_vat_inode);
>  parse_options_failure:
> -	if (uopt.nls_map)
> -		unload_nls(uopt.nls_map);
> +	unload_nls(uopt.nls_map);
>  	if (lvid_open)
>  		udf_close_lvid(sb);
>  	brelse(sbi->s_lvid_bh);
> @@ -2359,8 +2348,7 @@ static void udf_put_super(struct super_block *sb)
>  	sbi = UDF_SB(sb);
>  
>  	iput(sbi->s_vat_inode);
> -	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
> -		unload_nls(sbi->s_nls_map);
> +	unload_nls(sbi->s_nls_map);
>  	if (!sb_rdonly(sb))
>  		udf_close_lvid(sb);
>  	brelse(sbi->s_lvid_bh);
> diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
> index 758efe557a19..4fa620543d30 100644
> --- a/fs/udf/udf_sb.h
> +++ b/fs/udf/udf_sb.h
> @@ -20,8 +20,6 @@
>  #define UDF_FLAG_UNDELETE		6
>  #define UDF_FLAG_UNHIDE			7
>  #define UDF_FLAG_VARCONV		8
> -#define UDF_FLAG_NLS_MAP		9
> -#define UDF_FLAG_UTF8			10
>  #define UDF_FLAG_UID_FORGET     11    /* save -1 for uid to disk */
>  #define UDF_FLAG_GID_FORGET     12
>  #define UDF_FLAG_UID_SET	13
> diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
> index 5fcfa96463eb..622569007b53 100644
> --- a/fs/udf/unicode.c
> +++ b/fs/udf/unicode.c
> @@ -177,7 +177,7 @@ static int udf_name_from_CS0(struct super_block *sb,
>  		return 0;
>  	}
>  
> -	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
> +	if (UDF_SB(sb)->s_nls_map)
>  		conv_f = UDF_SB(sb)->s_nls_map->uni2char;
>  	else
>  		conv_f = NULL;
> @@ -285,7 +285,7 @@ static int udf_name_to_CS0(struct super_block *sb,
>  	if (ocu_max_len <= 0)
>  		return 0;
>  
> -	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
> +	if (UDF_SB(sb)->s_nls_map)
>  		conv_f = UDF_SB(sb)->s_nls_map->char2uni;
>  	else
>  		conv_f = NULL;
> -- 
> 2.20.1
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR