Function hhook_run_hooks

freebsd/kern/kern_hhook.c:95–127

* Run all helper hook functions for a given hook point. */

 * Run all helper hook functions for a given hook point.
 */
void
hhook_run_hooks(struct hhook_head *hhh, void *ctx_data, struct osd *hosd)
{
	struct hhook *hhk;
	void *hdata;
	struct rm_priotracker rmpt;

	KASSERT(hhh->hhh_refcount > 0, ("hhook_head %p refcount is 0", hhh));

	HHH_RLOCK(hhh, &rmpt);
	STAILQ_FOREACH(hhk, &hhh->hhh_hooks, hhk_next) {
		if (hhk->hhk_helper != NULL &&
		    hhk->hhk_helper->h_flags & HELPER_NEEDS_OSD) {
			hdata = osd_get(OSD_KHELP, hosd, hhk->hhk_helper->h_id);
			if (hdata == NULL)
				continue;
		} else
			hdata = NULL;

		/*
		 * XXXLAS: We currently ignore the int returned by the hook,
		 * but will likely want to handle it in future to allow hhook to
		 * be used like pfil and effect changes at the hhook calling
		 * site e.g. we could define a new hook type of HHOOK_TYPE_PFIL
		 * and standardise what particular return values mean and set
		 * the context data to pass exactly the same information as pfil
		 * hooks currently receive, thus replicating pfil with hhook.
		 */
		hhk->hhk_func(hhh->hhh_type, hhh->hhh_id, hhk->hhk_udata,
		    ctx_data, hdata, hosd);
	}
	HHH_RUNLOCK(hhh, &rmpt);
}

/*
 * Register a new helper hook function with a helper hook point.