ovl: port ovl_nlink_end() to cred guard

Use the scoped ovl cred guard.

Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-v4-29-b31603935724@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index e61eb758349ac7d630ce09f2a6fa4178278a3f5e..0d9487cac0e8838c8542d253cd746e5cadb8673c 100644 (file)
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -1211,11 +1211,8 @@ void ovl_nlink_end(struct dentry *dentry)
        ovl_drop_write(dentry);
 
        if (ovl_test_flag(OVL_INDEX, inode) && inode->i_nlink == 0) {
-               const struct cred *old_cred;
-
-               old_cred = ovl_override_creds(dentry->d_sb);
-               ovl_cleanup_index(dentry);
-               ovl_revert_creds(old_cred);
+               with_ovl_creds(dentry->d_sb)
+                       ovl_cleanup_index(dentry);
        }
 
        ovl_inode_unlock(inode);