+static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)
+{
+ bool old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
+ bool new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
+
+ if (old_dir != new_dir && old_is_dir != new_is_dir) {
+ if (old_is_dir) {
+ drop_nlink(old_dir);
+ inc_nlink(new_dir);
+ } else {
+ drop_nlink(new_dir);
+ inc_nlink(old_dir);
+ }
+ }
+ old_dir->i_ctime = old_dir->i_mtime =
+ new_dir->i_ctime = new_dir->i_mtime =
+ old_dentry->d_inode->i_ctime =
+ new_dentry->d_inode->i_ctime = CURRENT_TIME;
+
+ return 0;
+}
+