[PATCH AUTOSEL 5.10 15/39] udf: Fix iocharset=utf8 mount option

Sasha Levin
2021-09-06T01:26:19Z

From: Pali Rohár <pali@kernel.org>

[ Upstream commit b645333443712d2613e4e863f81090d5dc509657 ]

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.

Link: https://lore.kernel.org/r/20210808162453.1653-4-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 a59bf469dd1c..5d2b820ef303 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -343,10 +343,10 @@ 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;
}
@@ -551,19 +551,24 @@ 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:
@@ -2145,21 +2150,6 @@ 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;

@@ -2314,8 +2304,7 @@ 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);
@@ -2365,8 +2354,7 @@ 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;
--
2.30.2