[PATCH 07/21] nullfs: don't update the access time

[Christian Brauner]

There's no point in updating access times of the nullfs instance. Raise
S_IMMUTABLE.

Fixes: 9d4e752a24f7 ("namespace: allow creating empty mount namespaces")
Cc: stable@xxxxxxxxxxxxxxx # v7.1+
Signed-off-by: Christian Brauner (Amutable) <brauner@xxxxxxxxxx>
---
 fs/nullfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nullfs.c b/fs/nullfs.c
index e06352c7b2cc..40aa228bd81a 100644
--- a/fs/nullfs.c
+++ b/fs/nullfs.c
@@ -32,8 +32,8 @@ static int nullfs_fs_fill_super(struct super_block *s, struct fs_context *fc)
 	make_empty_dir_inode(inode);
 	simple_inode_init_ts(inode);
 	inode->i_ino	= 1;
-	/* ... and immutable. */
-	inode->i_flags |= S_IMMUTABLE;
+	/* ... and immutable, reading it leaves no trace either. */
+	inode->i_flags |= S_IMMUTABLE | S_NOATIME;
 
 	s->s_root = d_make_root(inode);
 	if (!s->s_root)

-- 
2.53.0