[RFC PATCH 4/4] fs/ntfs3: Add iocharset= mount option as alias for nls=

[Kari Argillander <kari.argillander@gmail.com>]

Other fs drivers are using iocharset= mount option for specifying charset.
So add it also for ntfs3 and mark old nls= mount option as deprecated.

Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
---
 Documentation/filesystems/ntfs3.rst |  4 ++--
 fs/ntfs3/super.c                    | 14 +++++++++-----
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/Documentation/filesystems/ntfs3.rst b/Documentation/filesystems/ntfs3.rst
index af7158de6fde..ded706474825 100644
--- a/Documentation/filesystems/ntfs3.rst
+++ b/Documentation/filesystems/ntfs3.rst
@@ -32,12 +32,12 @@ generic ones.
 
 ===============================================================================
 
-nls=name		This option informs the driver how to interpret path
+iocharset=name		This option informs the driver how to interpret path
 			strings and translate them to Unicode and back. If
 			this option is not set, the default codepage will be
 			used (CONFIG_NLS_DEFAULT).
 			Examples:
-				'nls=utf8'
+				'iocharset=utf8'
 
 uid=
 gid=
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 2a4866c2a512..886c495d2f5c 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -240,7 +240,7 @@ enum Opt {
 	Opt_nohidden,
 	Opt_showmeta,
 	Opt_acl,
-	Opt_nls,
+	Opt_iocharset,
 	Opt_prealloc,
 	Opt_no_acs_rules,
 	Opt_err,
@@ -260,9 +260,13 @@ static const struct fs_parameter_spec ntfs_fs_parameters[] = {
 	fsparam_flag_no("hidden",		Opt_nohidden),
 	fsparam_flag_no("acl",			Opt_acl),
 	fsparam_flag_no("showmeta",		Opt_showmeta),
-	fsparam_string("nls",			Opt_nls),
 	fsparam_flag_no("prealloc",		Opt_prealloc),
 	fsparam_flag("no_acs_rules",		Opt_no_acs_rules),
+	fsparam_string("iocharset",		Opt_iocharset),
+
+	__fsparam(fs_param_is_string,
+		  "nls", Opt_iocharset,
+		  fs_param_deprecated, NULL),
 	{}
 };
 // clang-format on
@@ -342,7 +346,7 @@ static int ntfs_fs_parse_param(struct fs_context *fc, struct fs_parameter *param
 	case Opt_showmeta:
 		opts->showmeta = result.negated ? 0 : 1;
 		break;
-	case Opt_nls:
+	case Opt_iocharset:
 		unload_nls(opts->nls);
 
 		opts->nls = ntfs_load_nls(param->string);
@@ -529,9 +533,9 @@ static int ntfs_show_options(struct seq_file *m, struct dentry *root)
 	if (opts->dmask)
 		seq_printf(m, ",dmask=%04o", ~opts->fs_dmask_inv);
 	if (opts->nls)
-		seq_printf(m, ",nls=%s", opts->nls->charset);
+		seq_printf(m, ",iocharset=%s", opts->nls->charset);
 	else
-		seq_puts(m, ",nls=utf8");
+		seq_puts(m, ",iocharset=utf8");
 	if (opts->sys_immutable)
 		seq_puts(m, ",sys_immutable");
 	if (opts->discard)
-- 
2.25.1