[PATCH 01/11] fs/ntfs3: show supported options when an unknown one is given

[Konstantin Komarov]

When an unrecognised mount option is passed, fs_parse() returns
-ENOPARAM. Print the list of supported options alongside the key, so the
correct spelling can be found directly.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
---
 fs/ntfs3/super.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index d3093f72ea38..7fd83027007b 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -339,6 +339,17 @@ static int ntfs_fs_parse_param(struct fs_context *fc,
 	int opt;
 
 	opt = fs_parse(fc, ntfs_fs_parameters, param, &result);
+
+	if (opt == -ENOPARAM && strcmp(param->key, "source")) {
+		/* Show mini help. */
+		pr_err("ntfs3: unknown option \"%s\". Use uid,gid,umask,"
+		       "dmask,fmask,sys_immutable,discard,force,sparse,"
+		       "nohidden,hide_dot_files,windows_names,showmeta,acl,"
+		       "iocharset,prealloc,nocase,delalloc,ads",
+		       param->key);
+		return -ENOPARAM;
+	}
+
 	if (opt < 0)
 		return opt;
 
-- 
2.43.0