ovl: change ovl_create_real() to receive dentry parent

Instead of passing an inode *dir, pass a dentry *parent.  This makes the
calling slightly cleaner.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://lore.kernel.org/20250716004725.1206467-21-neil@brown.name
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: neilbrown

fs/overlayfs/dir.c

@@ -160,9 +160,10 @@ int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct dentry *dir,
 	goto out;
 }
 
-struct dentry *ovl_create_real(struct ovl_fs *ofs, struct inode *dir,
+struct dentry *ovl_create_real(struct ovl_fs *ofs, struct dentry *parent,
 			       struct dentry *newdentry, struct ovl_cattr *attr)
 {
+	struct inode *dir = parent->d_inode;
 	int err;
 
 	if (IS_ERR(newdentry))
@@ -223,7 +224,7 @@ struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir,
 {
 	struct dentry *ret;
 	inode_lock(workdir->d_inode);
-	ret = ovl_create_real(ofs, d_inode(workdir),
+	ret = ovl_create_real(ofs, workdir,
 			      ovl_lookup_temp(ofs, workdir), attr);
 	inode_unlock(workdir->d_inode);
 	return ret;
@@ -329,7 +330,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
 	int err;
 
 	inode_lock_nested(udir, I_MUTEX_PARENT);
-	newdentry = ovl_create_real(ofs, udir,
+	newdentry = ovl_create_real(ofs, upperdir,
 				    ovl_lookup_upper(ofs, dentry->d_name.name,
 						     upperdir, dentry->d_name.len),
 				    attr);

fs/overlayfs/overlayfs.h

@@ -859,7 +859,7 @@ struct ovl_cattr {
 #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) })
 
 struct dentry *ovl_create_real(struct ovl_fs *ofs,
-			       struct inode *dir, struct dentry *newdentry,
+			       struct dentry *parent, struct dentry *newdentry,
 			       struct ovl_cattr *attr);
 int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry);
 int ovl_cleanup_unlocked(struct ovl_fs *ofs, struct dentry *workdir, struct dentry *dentry);

fs/overlayfs/super.c

@@ -622,8 +622,7 @@ static struct dentry *ovl_lookup_or_create(struct ovl_fs *ofs,
 	inode_lock_nested(parent->d_inode, I_MUTEX_PARENT);
 	child = ovl_lookup_upper(ofs, name, parent, len);
 	if (!IS_ERR(child) && !child->d_inode)
-		child = ovl_create_real(ofs, parent->d_inode, child,
-					OVL_CATTR(mode));
+		child = ovl_create_real(ofs, parent, child, OVL_CATTR(mode));
 	inode_unlock(parent->d_inode);
 	dput(parent);