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From: "Pali Rohár" <pali@kernel.org>
To: 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 Behún" <marek.behun@nic.cz>,
	"Christoph Hellwig" <hch@infradead.org>
Subject: [RFC PATCH 14/20] jfs: Remove custom iso8859-1 implementation
Date: Sun,  8 Aug 2021 18:24:47 +0200	[thread overview]
Message-ID: <20210808162453.1653-15-pali@kernel.org> (raw)
In-Reply-To: <20210808162453.1653-1-pali@kernel.org>

When iocharset= mount option is not specified or when is set to
iocharset=none then jfs driver uses its own custom iso8895-1 encoding
implementation.

NLS already provides iso8895-1 module, so use it instead of custom jfs
iso8859-1 implementation.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 fs/jfs/jfs_unicode.c | 14 +-------------
 fs/jfs/super.c       | 29 +++++++++++++++++++----------
 2 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/fs/jfs/jfs_unicode.c b/fs/jfs/jfs_unicode.c
index 0c1e9027245a..1d0f65d13b58 100644
--- a/fs/jfs/jfs_unicode.c
+++ b/fs/jfs/jfs_unicode.c
@@ -33,13 +33,8 @@ int jfs_strfromUCS_le(char *to, const __le16 * from,
 					       NLS_MAX_CHARSET_SIZE);
 			if (charlen > 0)
 				outlen += charlen;
-			else
+			else {
 				to[outlen++] = '?';
-		}
-	} else {
-		for (i = 0; (i < len) && from[i]; i++) {
-			if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
-				to[i] = '?';
 				if (unlikely(warn)) {
 					warn--;
 					warn_again--;
@@ -49,12 +44,8 @@ int jfs_strfromUCS_le(char *to, const __le16 * from,
 					printk(KERN_ERR
 				"mount with iocharset=utf8 to access\n");
 				}
-
 			}
-			else
-				to[i] = (char) (le16_to_cpu(from[i]));
 		}
-		outlen = i;
 	}
 	to[outlen] = 0;
 	return outlen;
@@ -84,9 +75,6 @@ static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
 				return charlen;
 			}
 		}
-	} else {
-		for (i = 0; (i < len) && from[i]; i++)
-			to[i] = (wchar_t) from[i];
 	}
 
 	to[i] = 0;
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 9030aeaf0f88..8ba2ac032292 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -231,7 +231,7 @@ static const match_table_t tokens = {
 };
 
 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
-			 int *flag)
+			 int *flag, int remount)
 {
 	void *nls_map = (void *)-1;	/* -1: no change;  NULL: none */
 	char *p;
@@ -263,14 +263,14 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 		case Opt_iocharset:
 			if (nls_map && nls_map != (void *) -1)
 				unload_nls(nls_map);
-			if (!strcmp(args[0].from, "none"))
-				nls_map = NULL;
-			else {
+			/* 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;
-				}
+			if (!nls_map) {
+				pr_err("JFS: charset not found\n");
+				goto cleanup;
 			}
 			break;
 		case Opt_resize:
@@ -414,6 +414,15 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 		}
 	}
 
+	if (!remount && nls_map == (void *) -1) {
+		/* Previously default NLS table was ISO-8859-1 */
+		nls_map = load_nls("iso8859-1");
+		if (!nls_map) {
+			pr_err("JFS: iso8859-1 charset not found\n");
+			goto cleanup;
+		}
+	}
+
 	if (nls_map != (void *) -1) {
 		/* Discard old (if remount) */
 		unload_nls(sbi->nls_tab);
@@ -435,7 +444,7 @@ static int jfs_remount(struct super_block *sb, int *flags, char *data)
 	int ret;
 
 	sync_filesystem(sb);
-	if (!parse_options(data, sb, &newLVSize, &flag))
+	if (!parse_options(data, sb, &newLVSize, &flag, 1))
 		return -EINVAL;
 
 	if (newLVSize) {
@@ -513,7 +522,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	/* initialize the mount flag and determine the default error handler */
 	flag = JFS_ERR_REMOUNT_RO;
 
-	if (!parse_options((char *) data, sb, &newLVSize, &flag))
+	if (!parse_options((char *) data, sb, &newLVSize, &flag, 0))
 		goto out_kfree;
 	sbi->flag = flag;
 
-- 
2.20.1


  parent reply	other threads:[~2021-08-08 16:25 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-08 16:24 [RFC PATCH 00/20] fs: Remove usage of broken nls_utf8 and drop it Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 01/20] fat: Fix iocharset=utf8 mount option Pali Rohár
2021-08-15  3:42   ` OGAWA Hirofumi
2021-08-15  9:42     ` Pali Rohár
2021-08-15 11:23       ` OGAWA Hirofumi
2021-08-23  3:51   ` Kari Argillander
2021-08-08 16:24 ` [RFC PATCH 02/20] hfsplus: Add iocharset= mount option as alias for nls= Pali Rohár
2021-08-09 17:51   ` Viacheslav Dubeyko
2021-08-09 20:49   ` Kari Argillander
2021-08-09 21:25     ` Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 03/20] udf: Fix iocharset=utf8 mount option Pali Rohár
2021-08-12 14:17   ` Jan Kara
2021-08-12 15:51     ` Pali Rohár
2021-08-13 13:48       ` Jan Kara
2021-08-19  8:34         ` Pali Rohár
2021-08-19 10:41           ` Jan Kara
2021-08-08 16:24 ` [RFC PATCH 04/20] isofs: joliet: " Pali Rohár
2021-08-12 14:18   ` Jan Kara
2021-08-08 16:24 ` [RFC PATCH 05/20] ntfs: Undeprecate iocharset= " Pali Rohár
2021-08-09 20:52   ` Kari Argillander
2021-08-19  1:21   ` Kari Argillander
2021-08-19  8:12     ` Pali Rohár
2021-08-19 10:23       ` Kari Argillander
2021-08-19 22:04         ` Pali Rohár
2021-08-19 23:18           ` Kari Argillander
2021-08-08 16:24 ` [RFC PATCH 06/20] ntfs: Fix error processing when load_nls() fails Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 07/20] befs: Fix printing iocharset= mount option Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 08/20] befs: Rename enum value Opt_charset to Opt_iocharset to match " Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 09/20] befs: Fix error processing when load_nls() fails Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 10/20] befs: Allow to use native UTF-8 mode Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 11/20] hfs: Explicitly set hsb->nls_disk when hsb->nls_io is set Pali Rohár
2021-08-09 17:31   ` Viacheslav Dubeyko
2021-08-09 17:37     ` Matthew Wilcox
2021-08-09 17:47       ` Pali Rohár
2021-08-09 20:43         ` Steve French
2021-08-09 18:00       ` Viacheslav Dubeyko
2021-08-08 16:24 ` [RFC PATCH 12/20] hfs: Do not use broken utf8 NLS table for iocharset=utf8 mount option Pali Rohár
2021-08-09 17:49   ` Viacheslav Dubeyko
2021-08-08 16:24 ` [RFC PATCH 13/20] hfsplus: " Pali Rohár
2021-08-09 17:42   ` Viacheslav Dubeyko
2021-08-08 16:24 ` Pali Rohár [this message]
2021-08-08 16:24 ` [RFC PATCH 15/20] jfs: Fix buffer overflow in jfs_strfromUCS_le() function Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 16/20] jfs: Do not use broken utf8 NLS table for iocharset=utf8 mount option Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 17/20] ntfs: " Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 18/20] cifs: " Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 19/20] cifs: Remove usage of load_nls_default() calls Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 20/20] nls: Drop broken nls_utf8 module Pali Rohár
2021-09-03 21:26 ` [RFC PATCH 00/20] fs: Remove usage of broken nls_utf8 and drop it Kari Argillander
2021-09-03 21:37   ` Pali Rohár
2021-09-03 22:06     ` Kari Argillander

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