390 lines
9.2 KiB
C
390 lines
9.2 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* XXX: How do we in general know that objects referenced in events
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* have not been destroyed before we get around to handle the event ?
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*/
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#include <sys/param.h>
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#ifndef _KERNEL
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <err.h>
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#else
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/eventhandler.h>
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#endif
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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static struct event_tailq_head g_events = TAILQ_HEAD_INITIALIZER(g_events);
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static u_int g_pending_events;
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static void g_do_event(struct g_event *ep);
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static TAILQ_HEAD(,g_provider) g_doorstep = TAILQ_HEAD_INITIALIZER(g_doorstep);
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static struct mtx g_eventlock;
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static struct sx g_eventstall;
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static int g_shutdown;
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void
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g_waitidle(void)
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{
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while (g_pending_events)
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tsleep(&g_pending_events, PPAUSE, "g_waitidle", hz/5);
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}
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void
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g_stall_events(void)
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{
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sx_xlock(&g_eventstall);
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}
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void
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g_release_events(void)
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{
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sx_xunlock(&g_eventstall);
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}
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void
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g_orphan_provider(struct g_provider *pp, int error)
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{
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g_trace(G_T_TOPOLOGY, "g_orphan_provider(%p(%s), %d)",
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pp, pp->name, error);
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KASSERT(error != 0,
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("g_orphan_provider(%p(%s), 0) error must be non-zero\n",
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pp, pp->name));
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pp->error = error;
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mtx_lock(&g_eventlock);
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TAILQ_INSERT_TAIL(&g_doorstep, pp, orphan);
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mtx_unlock(&g_eventlock);
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wakeup(&g_wait_event);
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}
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/*
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* This function is called once on each provider which the event handler
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* finds on its g_doorstep.
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*/
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static void
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g_orphan_register(struct g_provider *pp)
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{
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struct g_consumer *cp, *cp2;
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g_trace(G_T_TOPOLOGY, "g_orphan_register(%s)", pp->name);
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g_topology_assert();
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/*
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* Tell all consumers the bad news.
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* Don't be surprised if they self-destruct.
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*/
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cp = LIST_FIRST(&pp->consumers);
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while (cp != NULL) {
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cp2 = LIST_NEXT(cp, consumers);
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KASSERT(cp->geom->orphan != NULL,
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("geom %s has no orphan, class %s",
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cp->geom->name, cp->geom->class->name));
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cp->geom->orphan(cp);
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cp = cp2;
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}
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#ifdef notyet
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cp = LIST_FIRST(&pp->consumers);
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if (cp != NULL)
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return;
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if (pp->geom->flags & G_GEOM_WITHER)
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g_destroy_provider(pp);
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#endif
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}
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static void
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g_destroy_event(struct g_event *ep)
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{
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g_free(ep);
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}
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static void
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g_do_event(struct g_event *ep)
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{
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struct g_class *mp, *mp2;
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struct g_geom *gp;
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struct g_consumer *cp, *cp2;
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struct g_provider *pp;
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int i;
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g_trace(G_T_TOPOLOGY, "g_do_event(%p) %d m:%p g:%p p:%p c:%p - ",
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ep, ep->event, ep->class, ep->geom, ep->provider, ep->consumer);
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g_topology_assert();
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switch (ep->event) {
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case EV_CALL_ME:
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ep->func(ep->arg);
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g_topology_assert();
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break;
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case EV_NEW_CLASS:
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mp2 = ep->class;
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if (g_shutdown)
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break;
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if (mp2->taste == NULL)
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break;
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if (g_shutdown)
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break;
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LIST_FOREACH(mp, &g_classes, class) {
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if (mp2 == mp)
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continue;
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LIST_FOREACH(gp, &mp->geom, geom) {
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LIST_FOREACH(pp, &gp->provider, provider) {
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mp2->taste(ep->class, pp, 0);
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g_topology_assert();
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}
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}
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}
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break;
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case EV_NEW_PROVIDER:
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if (g_shutdown)
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break;
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g_trace(G_T_TOPOLOGY, "EV_NEW_PROVIDER(%s)",
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ep->provider->name);
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LIST_FOREACH(mp, &g_classes, class) {
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if (mp->taste == NULL)
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continue;
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if (!strcmp(ep->provider->name, "geom.ctl") &&
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strcmp(mp->name, "DEV"))
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continue;
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i = 1;
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LIST_FOREACH(cp, &ep->provider->consumers, consumers)
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if(cp->geom->class == mp)
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i = 0;
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if (i) {
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mp->taste(mp, ep->provider, 0);
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g_topology_assert();
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}
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}
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break;
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case EV_SPOILED:
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g_trace(G_T_TOPOLOGY, "EV_SPOILED(%p(%s),%p)",
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ep->provider, ep->provider->name, ep->consumer);
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cp = LIST_FIRST(&ep->provider->consumers);
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while (cp != NULL) {
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cp2 = LIST_NEXT(cp, consumers);
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if (cp->spoiled) {
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g_trace(G_T_TOPOLOGY, "spoiling %p (%s) (%p)",
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cp, cp->geom->name, cp->geom->spoiled);
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if (cp->geom->spoiled != NULL)
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cp->geom->spoiled(cp);
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else
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cp->spoiled = 0;
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}
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cp = cp2;
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}
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break;
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case EV_LAST:
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default:
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KASSERT(1 == 0, ("Unknown event %d", ep->event));
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}
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}
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static int
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one_event(void)
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{
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struct g_event *ep;
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struct g_provider *pp;
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sx_xlock(&g_eventstall);
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g_topology_lock();
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for (;;) {
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mtx_lock(&g_eventlock);
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pp = TAILQ_FIRST(&g_doorstep);
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if (pp != NULL)
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TAILQ_REMOVE(&g_doorstep, pp, orphan);
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mtx_unlock(&g_eventlock);
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if (pp == NULL)
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break;
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g_orphan_register(pp);
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}
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mtx_lock(&g_eventlock);
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ep = TAILQ_FIRST(&g_events);
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if (ep == NULL) {
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mtx_unlock(&g_eventlock);
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g_topology_unlock();
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sx_xunlock(&g_eventstall);
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return (0);
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}
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TAILQ_REMOVE(&g_events, ep, events);
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mtx_unlock(&g_eventlock);
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if (ep->class != NULL)
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ep->class->event = NULL;
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if (ep->geom != NULL)
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ep->geom->event = NULL;
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if (ep->provider != NULL)
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ep->provider->event = NULL;
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if (ep->consumer != NULL)
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ep->consumer->event = NULL;
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g_do_event(ep);
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g_destroy_event(ep);
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g_pending_events--;
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if (g_pending_events == 0)
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wakeup(&g_pending_events);
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g_topology_unlock();
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sx_xunlock(&g_eventstall);
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return (1);
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}
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void
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g_run_events()
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{
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while (one_event())
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;
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}
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void
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g_post_event(enum g_events ev, struct g_class *mp, struct g_geom *gp, struct g_provider *pp, struct g_consumer *cp)
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{
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struct g_event *ep;
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g_trace(G_T_TOPOLOGY, "g_post_event(%d, %p, %p, %p, %p)",
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ev, mp, gp, pp, cp);
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g_topology_assert();
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ep = g_malloc(sizeof *ep, M_WAITOK | M_ZERO);
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ep->event = ev;
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if (mp != NULL) {
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ep->class = mp;
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KASSERT(mp->event == NULL, ("Double event on class %d %d",
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ep->event, mp->event->event));
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mp->event = ep;
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}
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if (gp != NULL) {
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ep->geom = gp;
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KASSERT(gp->event == NULL, ("Double event on geom %d %d",
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ep->event, gp->event->event));
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gp->event = ep;
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}
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if (pp != NULL) {
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ep->provider = pp;
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KASSERT(pp->event == NULL, ("Double event on provider %s %d %d",
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pp->name, ep->event, pp->event->event));
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pp->event = ep;
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}
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if (cp != NULL) {
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ep->consumer = cp;
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KASSERT(cp->event == NULL, ("Double event on consumer %d %d",
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ep->event, cp->event->event));
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cp->event = ep;
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}
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mtx_lock(&g_eventlock);
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g_pending_events++;
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TAILQ_INSERT_TAIL(&g_events, ep, events);
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mtx_unlock(&g_eventlock);
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wakeup(&g_wait_event);
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}
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void
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g_cancel_event(struct g_class *mp, struct g_geom *gp, struct g_provider *pp, struct g_consumer *cp)
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{
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struct g_event *ep, *epn;
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mtx_lock(&g_eventlock);
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ep = TAILQ_FIRST(&g_events);
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for (;ep != NULL;) {
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epn = TAILQ_NEXT(ep, events);
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if (
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(ep->class != NULL && ep->class == mp) ||
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(ep->geom != NULL && ep->geom == gp) ||
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(ep->provider != NULL && ep->provider == pp) ||
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(ep->consumer != NULL && ep->consumer == cp)) {
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TAILQ_REMOVE(&g_events, ep, events);
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g_free(ep);
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}
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ep = epn;
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}
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mtx_unlock(&g_eventlock);
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}
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int
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g_call_me(g_call_me_t *func, void *arg)
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{
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struct g_event *ep;
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g_trace(G_T_TOPOLOGY, "g_call_me(%p, %p", func, arg);
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ep = g_malloc(sizeof *ep, M_NOWAIT | M_ZERO);
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if (ep == NULL)
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return (ENOMEM);
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ep->event = EV_CALL_ME;
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ep->func = func;
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ep->arg = arg;
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mtx_lock(&g_eventlock);
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g_pending_events++;
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TAILQ_INSERT_TAIL(&g_events, ep, events);
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mtx_unlock(&g_eventlock);
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wakeup(&g_wait_event);
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return (0);
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}
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#ifdef _KERNEL
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static void
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geom_shutdown(void *foo __unused)
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{
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g_shutdown = 1;
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}
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#endif
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void
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g_event_init()
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{
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#ifdef _KERNEL
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EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
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SHUTDOWN_PRI_FIRST);
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#endif
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mtx_init(&g_eventlock, "GEOM orphanage", NULL, MTX_DEF);
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sx_init(&g_eventstall, "GEOM event stalling");
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}
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