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Subject[RFC PATCH v2 14/18] jfs: Do not use broken utf8 NLS table for iocharset=utf8 mount option
Date
NLS table for utf8 is broken and cannot be fixed.

So instead of broken utf8 nls functions char2uni() and uni2char() use
functions utf8s_to_utf16s() and utf16s_to_utf8s() which implements correct
conversion between UTF-16 and UTF-8.

These functions implements also correct processing of UTF-16 surrogate
pairs and therefore after this change jfs driver would be able to correctly
handle also file names with 4-byte UTF-8 sequences.

When iochatset=utf8 is used then set sbi->nls_tab to NULL and use it for
distinguish between the fact if NLS table or native UTF-8 functions should
be used.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
fs/jfs/jfs_unicode.c | 17 +++++++++++++++--
fs/jfs/super.c | 24 +++++++++++++++---------
2 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/fs/jfs/jfs_unicode.c b/fs/jfs/jfs_unicode.c
index 2db923872bf1..0b0b80063a98 100644
--- a/fs/jfs/jfs_unicode.c
+++ b/fs/jfs/jfs_unicode.c
@@ -46,6 +46,9 @@ int jfs_strfromUCS_le(char *to, int maxlen, const __le16 * from,
}
}
}
+ } else {
+ outlen = utf16s_to_utf8s((const wchar_t *)from, len,
+ UTF16_LITTLE_ENDIAN, to, maxlen-1);
}
to[outlen] = 0;
return outlen;
@@ -61,6 +64,7 @@ static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
struct nls_table *codepage)
{
int charlen;
+ int outlen;
int i;

if (codepage) {
@@ -75,10 +79,19 @@ static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
return charlen;
}
}
+ outlen = i;
+ } else {
+ outlen = utf8s_to_utf16s(from, len, UTF16_LITTLE_ENDIAN,
+ to, len);
+ if (outlen < 1) {
+ jfs_err("jfs_strtoUCS: utf8s_to_utf16s returned %d.",
+ outlen);
+ return outlen;
+ }
}

- to[i] = 0;
- return i;
+ to[outlen] = 0;
+ return outlen;
}

/*
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index a2bb3d5d3f69..f26460147b62 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -261,16 +261,20 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
/* Don't do anything ;-) */
break;
case Opt_iocharset:
- if (nls_map && nls_map != (void *) -1)
+ if (nls_map && nls_map != (void *) -1) {
unload_nls(nls_map);
- /* compatibility alias none means ISO-8859-1 */
- if (strcmp(args[0].from, "none") == 0)
- nls_map = load_nls("iso8859-1");
- else
- nls_map = load_nls(args[0].from);
- if (!nls_map) {
- pr_err("JFS: charset not found\n");
- goto cleanup;
+ nls_map = NULL;
+ }
+ if (strcmp(args[0].from, "utf8") != 0) {
+ /* compatibility alias none means ISO-8859-1 */
+ if (strcmp(args[0].from, "none") == 0)
+ nls_map = load_nls("iso8859-1");
+ else
+ nls_map = load_nls(args[0].from);
+ if (!nls_map) {
+ pr_err("JFS: charset not found\n");
+ goto cleanup;
+ }
}
break;
case Opt_resize:
@@ -713,6 +717,8 @@ static int jfs_show_options(struct seq_file *seq, struct dentry *root)
seq_printf(seq, ",discard=%u", sbi->minblks_trim);
if (sbi->nls_tab)
seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
+ else
+ seq_puts(seq, ",iocharset=utf8");
if (sbi->flag & JFS_ERR_CONTINUE)
seq_printf(seq, ",errors=continue");
if (sbi->flag & JFS_ERR_PANIC)
--
2.20.1
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