/*
* Release all access permits and detach all associated attaches for the given
* thread group.
*/
void
xpmem_release_aps_of_tg(struct xpmem_thread_group *ap_tg)
{
struct xpmem_hashlist *hashlist;
struct xpmem_access_permit *ap;
int index;
for (index = 0; index < XPMEM_AP_HASHTABLE_SIZE; index++) {
hashlist = &ap_tg->ap_hashtable[index];
read_lock(&hashlist->lock);
while (!list_empty(&hashlist->list)) {
ap = list_entry((&hashlist->list)->next,
struct xpmem_access_permit,
ap_hashnode);
xpmem_ap_ref(ap);
read_unlock(&hashlist->lock);
xpmem_release_ap(ap_tg, ap);
xpmem_ap_deref(ap);
read_lock(&hashlist->lock);
}
read_unlock(&hashlist->lock);
}
}
/*
* Detach an attached XPMEM address segment.
*/
int
xpmem_detach(vaddr_t at_vaddr)
{
struct xpmem_thread_group *tg;
struct xpmem_access_permit *ap;
struct xpmem_attachment *att;
tg = xpmem_tg_ref_by_gid(current->aspace->id);
if (IS_ERR(tg))
return PTR_ERR(tg);
att = xpmem_att_ref_by_vaddr(tg, at_vaddr);
if (IS_ERR(att)) {
xpmem_tg_deref(tg);
return PTR_ERR(att);
}
mutex_lock(&att->mutex);
if (att->flags & XPMEM_FLAG_DESTROYING) {
mutex_unlock(&att->mutex);
xpmem_att_deref(att);
xpmem_tg_deref(tg);
return 0;
}
att->flags |= XPMEM_FLAG_DESTROYING;
ap = att->ap;
xpmem_ap_ref(ap);
if (current->aspace->id != ap->tg->gid) {
att->flags &= ~XPMEM_FLAG_DESTROYING;
xpmem_ap_deref(ap);
mutex_unlock(&att->mutex);
xpmem_att_deref(att);
return -EACCES;
}
__xpmem_detach_att(ap, att);
mutex_unlock(&att->mutex);
xpmem_att_destroyable(att);
xpmem_ap_deref(ap);
xpmem_att_deref(att);
xpmem_tg_deref(tg);
return 0;
}
