static int
null_vptocnp(struct vop_vptocnp_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode **dvp = ap->a_vpp;
struct vnode *lvp, *ldvp;
struct ucred *cred = ap->a_cred;
int error, locked;
if (vp->v_type == VDIR)
return (vop_stdvptocnp(ap));
locked = VOP_ISLOCKED(vp);
lvp = NULLVPTOLOWERVP(vp);
vhold(lvp);
VOP_UNLOCK(vp, 0); /* vp is held by vn_vptocnp_locked that called us */
ldvp = lvp;
error = vn_vptocnp(&ldvp, cred, ap->a_buf, ap->a_buflen);
vdrop(lvp);
if (error != 0) {
vn_lock(vp, locked | LK_RETRY);
return (ENOENT);
}
/*
* Exclusive lock is required by insmntque1 call in
* null_nodeget()
*/
error = vn_lock(ldvp, LK_EXCLUSIVE);
if (error != 0) {
vn_lock(vp, locked | LK_RETRY);
vdrop(ldvp);
return (ENOENT);
}
vref(ldvp);
vdrop(ldvp);
error = null_nodeget(vp->v_mount, ldvp, dvp);
if (error == 0) {
#ifdef DIAGNOSTIC
NULLVPTOLOWERVP(*dvp);
#endif
vhold(*dvp);
vput(*dvp);
} else
vput(ldvp);
vn_lock(vp, locked | LK_RETRY);
return (error);
}
static int
pefs_node_lookup_name(struct vnode *lvp, struct vnode *ldvp, struct ucred *cred,
char *encname, int *encname_len)
{
struct vnode *nldvp;
int error, locked, dlocked;
int buflen = *encname_len;
ASSERT_VOP_LOCKED(lvp, "pefs_node_lookup_name");
locked = VOP_ISLOCKED(lvp);
if (ldvp) {
dlocked = VOP_ISLOCKED(ldvp);
if (dlocked)
VOP_UNLOCK(ldvp, 0);
} else
dlocked = 0;
vref(lvp);
VOP_UNLOCK(lvp, 0);
nldvp = lvp;
error = vn_vptocnp(&nldvp, cred, encname, encname_len);
if (error == 0)
vrele(nldvp);
vrele(lvp);
if (ldvp && dlocked)
vn_lock(ldvp, dlocked | LK_RETRY);
vn_lock(lvp, locked | LK_RETRY);
if (error != 0)
return (ENOENT);
memcpy(encname, encname + *encname_len, buflen - *encname_len);
*encname_len = buflen - *encname_len;
if (*encname_len < buflen)
encname[*encname_len] = '\0';
return (0);
}
