[PATCH] overlayfs: improve ovl_get_acl

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Provide a proper stub for the !CONFIG_FS_POSIX_ACL case.

Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
 fs/overlayfs/inode.c     | 2 +-
 fs/overlayfs/overlayfs.h | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 492eddeb481f..ba2dde24c1f7 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -460,7 +460,7 @@ struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu)
 	const struct cred *old_cred;
 	struct posix_acl *acl;
+	if (!IS_POSIXACL(realinode))
 		return NULL;
 	if (rcu)
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 4f34b7e02eee..3d8de16a76e9 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -599,7 +599,13 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
 int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
 		  void *value, size_t size);
 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
 struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu);
+#define ovl_get_acl	NULL
 int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
 bool ovl_is_private_xattr(struct super_block *sb, const char *name);

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