Can I get information from other filesystems from overlayfs?

Question

Can you solve the problem of not knowing the inode information when modifying the path of upperdir in overlayfs?

After changing the upperdir path:

root@bcd0d4e391f8:~/myDir# ls -i   
ls: cannot access 'ssd.c': No such file or directory  
ls: cannot access 'ssd.abc': No such file or directory  
? ssd.abc  ? ssd.c

*The upperdir path was modified by changing the overlayfs code.

---

*Original code

static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
            struct ovl_cattr *attr){    

    struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
    struct inode *udir = upperdir->d_inode;
    struct dentry *newdentry;
    int err;

    newdentry = ovl_create_real(udir,
                lookup_one_len(dentry->d_name.name,
                       upperdir,
                       dentry->d_name.len),
                attr);

*Fix code example

static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
            struct ovl_cattr *attr){
     struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
     struct inode *udir = upperdir->d_inode;
     struct dentry *newdentry;
     int err;
     extern struct qsh_metadata qsh_mt; //HOON  

     newdentry = ovl_create_real(qsh_mt.qsh_dentry->d_inode,
            lookup_one_len(dentry->d_name.name,
                    qsh_mt.qsh_dentry,
                    dentry->d_name.len),
                attr);

*In the above code, I replaced the upperdir part with the disk I want and the mounted dentry object. *extern struct qsh_metadata qsh_mt; => Code I added

ex) struct dentry upperdir = qsh_dentry;
docker base mount : /dev/sda
qsh_dentry : mount /dev/sdb