regardinf Virtual File system VOP_RENAME_APV function.

[Cherukuri, Balaji]

Hi FreeBSD Team,

 

I am implementing a stackable file system similar to NULLFS and I have question on VOP_RENAME_APV function.

 

In VOP_RENAME_APV function:

 

VOP_RENAME_APV(struct vop_vector *vop, struct vop_rename_args *a)

{

        int rc;

 

....

        if (vop->vop_rename != NULL)

                rc = vop->vop_rename(a);

        else

                rc = vop->vop_bypass(&a->a_gen);

 ....

        vop_rename_post(a, rc);

        return (rc);

}

 

I want to know that what is the importance of vop_rename_post function. Actually I returned "EXDEV" from my file system, but still vop_rename_post  function is doing rename operation.

 

I want to know whether it is having default implementation of rename functionality, can I use this function for rename operation directly because I do not have anything new to do in rename functionality.

 

Please let me know, Is there any document which will talk how to write filesystem in FreeBSD environment? 

 

Thanks in advance,

BalajiC