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Message-ID: <20210812155134.g67ncugjvruos3cy@pali>
Date: Thu, 12 Aug 2021 17:51:34 +0200
From: Pali Rohár <pali@...nel.org>
To: Jan Kara <jack@...e.cz>
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>,
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 03/20] udf: Fix iocharset=utf8 mount option
On Thursday 12 August 2021 16:17:36 Jan Kara wrote:
> On Sun 08-08-21 18:24:36, Pali Rohár 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 Rohár <pali@...nel.org>
>
> Thanks for the cleanup. It looks good. Feel free to add:
>
> Reviewed-by: Jan Kara <jack@...e.cz>
>
> Or should I take this patch through my tree?
Hello! Patches are just RFC, mostly untested and not ready for merging.
I will wait for feedback and then I do more testing nad prepare new
patch series.
>
> 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@...e.com>
> SUSE Labs, CR
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