static void
dev_free_devlocked(struct cdev *cdev)
{
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_OWNED);
cdp = cdev2priv(cdev);
TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
}
static void
dev_free_devlocked(struct cdev *cdev)
{
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_OWNED);
cdp = cdev2priv(cdev);
KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0,
("destroy_dev() was not called after delist_dev(%p)", cdev));
TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
}
/*
* Read the cdev structure in the kernel in order to work out the
* associated dev_t
*/
dev_t
dev2udev(struct cdev *dev)
{
struct cdev_priv priv;
if (KVM_READ(cdev2priv(dev), &priv, sizeof priv)) {
return ((dev_t)priv.cdp_inode);
} else {
dprintf(stderr, "can't convert cdev *%p to a dev_t\n", dev);
return -1;
}
}
struct cdevsw *
dev_refthread(struct cdev *dev)
{
struct cdevsw *csw;
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_NOTOWNED);
dev_lock();
csw = dev->si_devsw;
if (csw != NULL) {
cdp = cdev2priv(dev);
if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
dev->si_threadcount++;
else
csw = NULL;
}
dev_unlock();
return (csw);
}
struct cdevsw *
devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
{
struct cdevsw *csw;
struct cdev_priv *cdp;
struct cdev *dev;
mtx_assert(&devmtx, MA_NOTOWNED);
if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
dev = vp->v_rdev;
if (dev == NULL)
return (NULL);
KASSERT((dev->si_flags & SI_ETERNAL) != 0,
("Not eternal cdev"));
*ref = 0;
csw = dev->si_devsw;
KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
*devp = dev;
return (csw);
}
csw = NULL;
dev_lock();
dev = vp->v_rdev;
if (dev == NULL) {
dev_unlock();
return (NULL);
}
cdp = cdev2priv(dev);
if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
csw = dev->si_devsw;
if (csw != NULL)
dev->si_threadcount++;
}
dev_unlock();
if (csw != NULL) {
*devp = dev;
*ref = 1;
}
return (csw);
}
struct cdevsw *
devvn_refthread(struct vnode *vp, struct cdev **devp)
{
struct cdevsw *csw;
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_NOTOWNED);
csw = NULL;
dev_lock();
*devp = vp->v_rdev;
if (*devp != NULL) {
cdp = cdev2priv(*devp);
if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
csw = (*devp)->si_devsw;
if (csw != NULL)
(*devp)->si_threadcount++;
}
}
dev_unlock();
return (csw);
}
struct cdevsw *
dev_refthread(struct cdev *dev, int *ref)
{
struct cdevsw *csw;
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_NOTOWNED);
if ((dev->si_flags & SI_ETERNAL) != 0) {
*ref = 0;
return (dev->si_devsw);
}
dev_lock();
csw = dev->si_devsw;
if (csw != NULL) {
cdp = cdev2priv(dev);
if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
atomic_add_long(&dev->si_threadcount, 1);
else
csw = NULL;
}
dev_unlock();
*ref = 1;
return (csw);
}
