The options "sync", "async", "dirsync", "lazytime", "nolazytime", "mand"
and "nomand" make no sense for the cgroup filesystem.  If these options are
supplied to fsconfig(FSCONFIG_SET_FLAG), then return -EINVAL instead of
silently ignoring the option.

Any implementation, such as mount(8) that needs to parse this option
without failing should simply ignore the return value from fsconfig().

Signed-off-by: Miklos Szeredi <redacted>
---
 kernel/cgroup/cgroup-v1.c | 2 +-
 kernel/cgroup/cgroup.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index f960e6149311..1f50d59f7f4e 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c

@@ -929,7 +929,7 @@ int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param)
 	struct fs_parse_result result;
 	int ret, opt, i;
 
-	ret = vfs_parse_sb_flag(fc, param);
+	ret = vfs_parse_ro_rw(fc, param);
 	if (ret != -ENOPARAM)
 		return ret;
 

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 93890285b510..f2e86b3942b3 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c

@@ -1836,7 +1836,7 @@ static int cgroup2_parse_param(struct fs_context *fc, struct fs_parameter *param
 	struct fs_parse_result result;
 	int ret, opt;
 
-	ret = vfs_parse_sb_flag(fc, param);
+	ret = vfs_parse_ro_rw(fc, param);
 	if (ret != -ENOPARAM)
 		return ret;
 

-- 
2.21.0