static void
pefs_insmntque_dtr(struct vnode *vp, void *_pn)
{
struct pefs_node *pn = _pn;
PEFSDEBUG("pefs_insmntque_dtr: free node %p\n", pn);
vp->v_data = NULL;
vp->v_vnlock = &vp->v_lock;
pefs_key_release(pn->pn_tkey.ptk_key);
uma_zfree(pefs_node_zone, pn);
vp->v_op = &dead_vnodeops;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vgone(vp);
vput(vp);
}
static void
dircache_entry_free(struct pefs_dircache_entry *pde)
{
MPASS(pde != NULL);
PEFSDEBUG("dircache_entry_free: %s -> %s\n",
pde->pde_name, pde->pde_encname);
pefs_key_release(pde->pde_tkey.ptk_key);
LIST_REMOVE(pde, pde_dir_entry);
mtx_lock(&dircache_mtx);
LIST_REMOVE(pde, pde_hash_entry);
LIST_REMOVE(pde, pde_enchash_entry);
dircache_entries--;
mtx_unlock(&dircache_mtx);
uma_zfree(dircache_entry_zone, pde);
}
/*
* Make a new or get existing pefs node.
* vp is the alias vnode
* lvp is the lower vnode
* ldvp is the lower directory vnode, used if no key specified
*
* The lvp assumed to be locked and having "spare" reference. This routine
* vrele lvp if pefs node was taken from hash. Otherwise it "transfers" the
* caller's "spare" reference to created pefs vnode.
*/
static int
pefs_node_get(struct mount *mp, struct vnode *lvp, struct vnode **vpp,
pefs_node_init_fn *init_fn, void *context)
{
struct pefs_node *pn;
struct vnode *vp;
int error;
ASSERT_VOP_LOCKED(lvp, "pefs_node_get");
/* Lookup the hash firstly */
*vpp = pefs_nodehash_get(mp, lvp);
if (*vpp != NULL) {
vrele(lvp);
return (0);
}
/*
* We do not serialize vnode creation, instead we will check for
* duplicates later, when adding new vnode to hash.
*
* Note that duplicate can only appear in hash if the lvp is
* locked LK_SHARED.
*/
/*
* Do the MALLOC before the getnewvnode since doing so afterward
* might cause a bogus v_data pointer to get dereferenced
* elsewhere if MALLOC should block.
*/
pn = uma_zalloc(pefs_node_zone, M_WAITOK | M_ZERO);
pn->pn_lowervp = lvp;
/* pn->pn_lowervp should be initialized before calling init_fn. */
error = init_fn(mp, pn, context);
MPASS(!(((pn->pn_flags & PN_HASKEY) == 0) ^
(pn->pn_tkey.ptk_key == NULL)));
if (error != 0) {
uma_zfree(pefs_node_zone, pn);
return (error);
}
error = getnewvnode("pefs", mp, &pefs_vnodeops, &vp);
if (error != 0) {
pefs_key_release(pn->pn_tkey.ptk_key);
uma_zfree(pefs_node_zone, pn);
return (error);
}
if (pn->pn_tkey.ptk_key == NULL)
PEFSDEBUG("pefs_node_get: creating node without key: %p\n", pn);
pn->pn_vnode = vp;
vp->v_type = lvp->v_type;
vp->v_data = pn;
vp->v_vnlock = lvp->v_vnlock;
if (vp->v_vnlock == NULL)
panic("pefs_node_get: Passed a NULL vnlock.\n");
error = insmntque1(vp, mp, pefs_insmntque_dtr, pn);
if (error != 0)
return (error);
/*
* Atomically insert our new node into the hash or vget existing
* if someone else has beaten us to it.
*/
*vpp = pefs_nodehash_insert(mp, pn);
if (*vpp != NULL) {
vrele(lvp);
vp->v_vnlock = &vp->v_lock;
pn->pn_lowervp = NULL;
vrele(vp);
MPASS(PEFS_LOWERVP(*vpp) == lvp);
ASSERT_VOP_LOCKED(*vpp, "pefs_node_get: duplicate");
return (0);
}
if (vp->v_type == VDIR)
pn->pn_dircache = pefs_dircache_get();
*vpp = vp;
MPASS(PEFS_LOWERVP(*vpp) == lvp);
ASSERT_VOP_LOCKED(*vpp, "pefs_node_get");
return (0);
}
