linux-kernel - [RFC PATCH v2 08/18] befs: Allow to use native UTF-8 mode

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Date:   Mon, 26 Dec 2022 15:21:40 +0100
From:   Pali Rohár <pali@...nel.org>
To:     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>,
        Jan Kara <jack@...e.cz>, "Theodore Y . Ts'o" <tytso@....edu>,
        Anton Altaparmakov <anton@...era.com>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Luis de Bethencourt <luisbg@...nel.org>,
        Salah Triki <salah.triki@...il.com>,
        Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@....nz>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>, Dave Kleikamp <shaggy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pavel Machek <pavel@....cz>,
        Christoph Hellwig <hch@...radead.org>,
        Kari Argillander <kari.argillander@...il.com>,
        Viacheslav Dubeyko <slava@...eyko.com>
Subject: [RFC PATCH v2 08/18] befs: Allow to use native UTF-8 mode

befs driver already has a code which avoids usage of NLS when befs_sb->nls
is not set.

But befs_fill_super() always set befs_sb->nls, so activating native UTF-8
is not possible.

Fix it by not setting befs_sb->nls when iocharset is set to utf8. So now
after this cgange mount option iocharset=utf8 activates usage of native
UTF-8 code path in befs driver.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 fs/befs/linuxvfs.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 8d2954e3afd6..e5400123d33f 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -769,6 +769,7 @@ static int befs_show_options(struct seq_file *m, struct dentry *root)
 {
 	struct befs_sb_info *befs_sb = BEFS_SB(root->d_sb);
 	struct befs_mount_options *opts = &befs_sb->mount_opts;
+	struct nls_table *nls = befs_sb->nls;
 
 	if (!uid_eq(opts->uid, GLOBAL_ROOT_UID))
 		seq_printf(m, ",uid=%u",
@@ -776,8 +777,10 @@ static int befs_show_options(struct seq_file *m, struct dentry *root)
 	if (!gid_eq(opts->gid, GLOBAL_ROOT_GID))
 		seq_printf(m, ",gid=%u",
 			   from_kgid_munged(&init_user_ns, opts->gid));
-	if (opts->iocharset)
-		seq_printf(m, ",iocharset=%s", opts->iocharset);
+	if (nls)
+		seq_printf(m, ",iocharset=%s", nls->charset);
+	else
+		seq_puts(m, ",iocharset=utf8");
 	if (opts->debug)
 		seq_puts(m, ",debug");
 	return 0;
@@ -815,6 +818,7 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
 	const unsigned long sb_block = 0;
 	const off_t x86_sb_off = 512;
 	int blocksize;
+	const char *p;
 
 	sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
 	if (sb->s_fs_info == NULL)
@@ -907,8 +911,11 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
 		goto unacquire_priv_sbp;
 	}
 
+	p = befs_sb->mount_opts.iocharset ? befs_sb->mount_opts.iocharset : CONFIG_NLS_DEFAULT;
+	if (strcmp(p, "utf8") == 0) {
+		befs_debug(sb, "Using native UTF-8 without nls");
 	/* load nls library */
-	if (befs_sb->mount_opts.iocharset) {
+	} else if (befs_sb->mount_opts.iocharset) {
 		befs_debug(sb, "Loading nls: %s",
 			   befs_sb->mount_opts.iocharset);
 		befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
-- 
2.20.1