1dd84a43cSPoul-Henning Kamp /*- 2dd84a43cSPoul-Henning Kamp * Copyright (c) 2002 Poul-Henning Kamp 3dd84a43cSPoul-Henning Kamp * Copyright (c) 2002 Networks Associates Technology, Inc. 4dd84a43cSPoul-Henning Kamp * All rights reserved. 5dd84a43cSPoul-Henning Kamp * 6dd84a43cSPoul-Henning Kamp * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7dd84a43cSPoul-Henning Kamp * and NAI Labs, the Security Research Division of Network Associates, Inc. 8dd84a43cSPoul-Henning Kamp * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9dd84a43cSPoul-Henning Kamp * DARPA CHATS research program. 10dd84a43cSPoul-Henning Kamp * 11dd84a43cSPoul-Henning Kamp * Redistribution and use in source and binary forms, with or without 12dd84a43cSPoul-Henning Kamp * modification, are permitted provided that the following conditions 13dd84a43cSPoul-Henning Kamp * are met: 14dd84a43cSPoul-Henning Kamp * 1. Redistributions of source code must retain the above copyright 15dd84a43cSPoul-Henning Kamp * notice, this list of conditions and the following disclaimer. 16dd84a43cSPoul-Henning Kamp * 2. Redistributions in binary form must reproduce the above copyright 17dd84a43cSPoul-Henning Kamp * notice, this list of conditions and the following disclaimer in the 18dd84a43cSPoul-Henning Kamp * documentation and/or other materials provided with the distribution. 19dd84a43cSPoul-Henning Kamp * 3. The names of the authors may not be used to endorse or promote 20dd84a43cSPoul-Henning Kamp * products derived from this software without specific prior written 21dd84a43cSPoul-Henning Kamp * permission. 22dd84a43cSPoul-Henning Kamp * 23dd84a43cSPoul-Henning Kamp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24dd84a43cSPoul-Henning Kamp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25dd84a43cSPoul-Henning Kamp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26dd84a43cSPoul-Henning Kamp * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27dd84a43cSPoul-Henning Kamp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28dd84a43cSPoul-Henning Kamp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29dd84a43cSPoul-Henning Kamp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30dd84a43cSPoul-Henning Kamp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31dd84a43cSPoul-Henning Kamp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32dd84a43cSPoul-Henning Kamp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33dd84a43cSPoul-Henning Kamp * SUCH DAMAGE. 34dd84a43cSPoul-Henning Kamp * 35dd84a43cSPoul-Henning Kamp * $FreeBSD$ 36dd84a43cSPoul-Henning Kamp */ 37dd84a43cSPoul-Henning Kamp 38dd84a43cSPoul-Henning Kamp /* 39dd84a43cSPoul-Henning Kamp * XXX: How do we in general know that objects referenced in events 40dd84a43cSPoul-Henning Kamp * have not been destroyed before we get around to handle the event ? 41dd84a43cSPoul-Henning Kamp */ 42dd84a43cSPoul-Henning Kamp 43dd84a43cSPoul-Henning Kamp #include <sys/param.h> 44dd84a43cSPoul-Henning Kamp #include <sys/malloc.h> 45dd84a43cSPoul-Henning Kamp #include <sys/systm.h> 46dd84a43cSPoul-Henning Kamp #include <sys/kernel.h> 47dd84a43cSPoul-Henning Kamp #include <sys/lock.h> 48dd84a43cSPoul-Henning Kamp #include <sys/mutex.h> 49afcbcfaeSPoul-Henning Kamp #include <machine/stdarg.h> 50dd84a43cSPoul-Henning Kamp #include <sys/errno.h> 51dd84a43cSPoul-Henning Kamp #include <sys/time.h> 52dd84a43cSPoul-Henning Kamp #include <geom/geom.h> 53b1876192SPoul-Henning Kamp #include <geom/geom_int.h> 54dd84a43cSPoul-Henning Kamp 55a974614bSPoul-Henning Kamp TAILQ_HEAD(event_tailq_head, g_event); 56a974614bSPoul-Henning Kamp 57dd84a43cSPoul-Henning Kamp static struct event_tailq_head g_events = TAILQ_HEAD_INITIALIZER(g_events); 58abb50a48SPoul-Henning Kamp static u_int g_pending_events; 59dd84a43cSPoul-Henning Kamp static TAILQ_HEAD(,g_provider) g_doorstep = TAILQ_HEAD_INITIALIZER(g_doorstep); 60903e43feSPoul-Henning Kamp static struct mtx g_eventlock; 61d943f1b0SPoul-Henning Kamp static struct sx g_eventstall; 62dd84a43cSPoul-Henning Kamp 63a974614bSPoul-Henning Kamp #define G_N_EVENTREFS 20 64a974614bSPoul-Henning Kamp 65a974614bSPoul-Henning Kamp struct g_event { 66a974614bSPoul-Henning Kamp TAILQ_ENTRY(g_event) events; 67a974614bSPoul-Henning Kamp g_event_t *func; 680a9c130cSPoul-Henning Kamp void *arg; 690a9c130cSPoul-Henning Kamp int flag; 70a974614bSPoul-Henning Kamp void *ref[G_N_EVENTREFS]; 71a974614bSPoul-Henning Kamp }; 72a974614bSPoul-Henning Kamp 730a9c130cSPoul-Henning Kamp #define EV_DONE 0x80000 740a9c130cSPoul-Henning Kamp #define EV_WAKEUP 0x40000 750a9c130cSPoul-Henning Kamp 76dd84a43cSPoul-Henning Kamp void 77503abe45SPoul-Henning Kamp g_waitidle(void) 78dd84a43cSPoul-Henning Kamp { 79dd84a43cSPoul-Henning Kamp 80dd84a43cSPoul-Henning Kamp while (g_pending_events) 81503abe45SPoul-Henning Kamp tsleep(&g_pending_events, PPAUSE, "g_waitidle", hz/5); 82dd84a43cSPoul-Henning Kamp } 83dd84a43cSPoul-Henning Kamp 84dd84a43cSPoul-Henning Kamp void 85d943f1b0SPoul-Henning Kamp g_stall_events(void) 86d943f1b0SPoul-Henning Kamp { 87d943f1b0SPoul-Henning Kamp 88fbf79df3SPoul-Henning Kamp sx_xlock(&g_eventstall); 89d943f1b0SPoul-Henning Kamp } 90d943f1b0SPoul-Henning Kamp 91d943f1b0SPoul-Henning Kamp void 92d943f1b0SPoul-Henning Kamp g_release_events(void) 93d943f1b0SPoul-Henning Kamp { 94d943f1b0SPoul-Henning Kamp 95fbf79df3SPoul-Henning Kamp sx_xunlock(&g_eventstall); 96d943f1b0SPoul-Henning Kamp } 97d943f1b0SPoul-Henning Kamp 98d943f1b0SPoul-Henning Kamp void 99dd84a43cSPoul-Henning Kamp g_orphan_provider(struct g_provider *pp, int error) 100dd84a43cSPoul-Henning Kamp { 101dd84a43cSPoul-Henning Kamp 102dd84a43cSPoul-Henning Kamp g_trace(G_T_TOPOLOGY, "g_orphan_provider(%p(%s), %d)", 103dd84a43cSPoul-Henning Kamp pp, pp->name, error); 104dd84a43cSPoul-Henning Kamp KASSERT(error != 0, 105dd84a43cSPoul-Henning Kamp ("g_orphan_provider(%p(%s), 0) error must be non-zero\n", 106dd84a43cSPoul-Henning Kamp pp, pp->name)); 107dd84a43cSPoul-Henning Kamp pp->error = error; 108903e43feSPoul-Henning Kamp mtx_lock(&g_eventlock); 109dd84a43cSPoul-Henning Kamp TAILQ_INSERT_TAIL(&g_doorstep, pp, orphan); 110903e43feSPoul-Henning Kamp mtx_unlock(&g_eventlock); 111dd84a43cSPoul-Henning Kamp wakeup(&g_wait_event); 112dd84a43cSPoul-Henning Kamp } 113dd84a43cSPoul-Henning Kamp 114dd84a43cSPoul-Henning Kamp /* 115dd84a43cSPoul-Henning Kamp * This function is called once on each provider which the event handler 116dd84a43cSPoul-Henning Kamp * finds on its g_doorstep. 117dd84a43cSPoul-Henning Kamp */ 118dd84a43cSPoul-Henning Kamp 119dd84a43cSPoul-Henning Kamp static void 120b1876192SPoul-Henning Kamp g_orphan_register(struct g_provider *pp) 121dd84a43cSPoul-Henning Kamp { 122dd84a43cSPoul-Henning Kamp struct g_consumer *cp, *cp2; 123dd84a43cSPoul-Henning Kamp 124dd84a43cSPoul-Henning Kamp g_trace(G_T_TOPOLOGY, "g_orphan_register(%s)", pp->name); 125dd84a43cSPoul-Henning Kamp g_topology_assert(); 126dd84a43cSPoul-Henning Kamp 127dd84a43cSPoul-Henning Kamp /* 128dd84a43cSPoul-Henning Kamp * Tell all consumers the bad news. 129f48b8819SPoul-Henning Kamp * Don't be surprised if they self-destruct. 130dd84a43cSPoul-Henning Kamp */ 131dd84a43cSPoul-Henning Kamp cp = LIST_FIRST(&pp->consumers); 132dd84a43cSPoul-Henning Kamp while (cp != NULL) { 133dd84a43cSPoul-Henning Kamp cp2 = LIST_NEXT(cp, consumers); 13407d77fc6SPoul-Henning Kamp KASSERT(cp->geom->orphan != NULL, 13507d77fc6SPoul-Henning Kamp ("geom %s has no orphan, class %s", 13607d77fc6SPoul-Henning Kamp cp->geom->name, cp->geom->class->name)); 13707d77fc6SPoul-Henning Kamp cp->geom->orphan(cp); 138dd84a43cSPoul-Henning Kamp cp = cp2; 139dd84a43cSPoul-Henning Kamp } 14020d2026bSPoul-Henning Kamp #ifdef notyet 141e5829909SPoul-Henning Kamp cp = LIST_FIRST(&pp->consumers); 142e5829909SPoul-Henning Kamp if (cp != NULL) 143e5829909SPoul-Henning Kamp return; 144e5829909SPoul-Henning Kamp if (pp->geom->flags & G_GEOM_WITHER) 145e5829909SPoul-Henning Kamp g_destroy_provider(pp); 14620d2026bSPoul-Henning Kamp #endif 147dd84a43cSPoul-Henning Kamp } 148dd84a43cSPoul-Henning Kamp 149dd84a43cSPoul-Henning Kamp static void 150dd84a43cSPoul-Henning Kamp g_destroy_event(struct g_event *ep) 151dd84a43cSPoul-Henning Kamp { 152dd84a43cSPoul-Henning Kamp 153dd84a43cSPoul-Henning Kamp g_free(ep); 154dd84a43cSPoul-Henning Kamp } 155dd84a43cSPoul-Henning Kamp 156dd84a43cSPoul-Henning Kamp static int 157b1876192SPoul-Henning Kamp one_event(void) 158dd84a43cSPoul-Henning Kamp { 159dd84a43cSPoul-Henning Kamp struct g_event *ep; 160dd84a43cSPoul-Henning Kamp struct g_provider *pp; 161dd84a43cSPoul-Henning Kamp 162d943f1b0SPoul-Henning Kamp sx_xlock(&g_eventstall); 163dd84a43cSPoul-Henning Kamp g_topology_lock(); 164dd84a43cSPoul-Henning Kamp for (;;) { 165903e43feSPoul-Henning Kamp mtx_lock(&g_eventlock); 166dd84a43cSPoul-Henning Kamp pp = TAILQ_FIRST(&g_doorstep); 167dd84a43cSPoul-Henning Kamp if (pp != NULL) 168dd84a43cSPoul-Henning Kamp TAILQ_REMOVE(&g_doorstep, pp, orphan); 169903e43feSPoul-Henning Kamp mtx_unlock(&g_eventlock); 170dd84a43cSPoul-Henning Kamp if (pp == NULL) 171dd84a43cSPoul-Henning Kamp break; 172b1876192SPoul-Henning Kamp g_orphan_register(pp); 173dd84a43cSPoul-Henning Kamp } 174346cd5feSPoul-Henning Kamp mtx_lock(&g_eventlock); 175dd84a43cSPoul-Henning Kamp ep = TAILQ_FIRST(&g_events); 176dd84a43cSPoul-Henning Kamp if (ep == NULL) { 177346cd5feSPoul-Henning Kamp mtx_unlock(&g_eventlock); 178dd84a43cSPoul-Henning Kamp g_topology_unlock(); 179d943f1b0SPoul-Henning Kamp sx_xunlock(&g_eventstall); 180dd84a43cSPoul-Henning Kamp return (0); 181dd84a43cSPoul-Henning Kamp } 182dd84a43cSPoul-Henning Kamp TAILQ_REMOVE(&g_events, ep, events); 183346cd5feSPoul-Henning Kamp mtx_unlock(&g_eventlock); 184d98777f8SPoul-Henning Kamp g_topology_assert(); 185d98777f8SPoul-Henning Kamp ep->func(ep->arg, 0); 186d98777f8SPoul-Henning Kamp g_topology_assert(); 1870a9c130cSPoul-Henning Kamp if (ep->flag & EV_WAKEUP) { 1880a9c130cSPoul-Henning Kamp ep->flag |= EV_DONE; 1890a9c130cSPoul-Henning Kamp wakeup(ep); 1900a9c130cSPoul-Henning Kamp } else { 191dd84a43cSPoul-Henning Kamp g_destroy_event(ep); 1920a9c130cSPoul-Henning Kamp } 193a9ed5e11SPoul-Henning Kamp g_pending_events--; 194a9ed5e11SPoul-Henning Kamp if (g_pending_events == 0) 195a9ed5e11SPoul-Henning Kamp wakeup(&g_pending_events); 196a9ed5e11SPoul-Henning Kamp g_topology_unlock(); 197d943f1b0SPoul-Henning Kamp sx_xunlock(&g_eventstall); 198dd84a43cSPoul-Henning Kamp return (1); 199dd84a43cSPoul-Henning Kamp } 200dd84a43cSPoul-Henning Kamp 201dd84a43cSPoul-Henning Kamp void 202b1876192SPoul-Henning Kamp g_run_events() 203dd84a43cSPoul-Henning Kamp { 204dd84a43cSPoul-Henning Kamp 205b1876192SPoul-Henning Kamp while (one_event()) 206dd84a43cSPoul-Henning Kamp ; 207dd84a43cSPoul-Henning Kamp } 208dd84a43cSPoul-Henning Kamp 209dd84a43cSPoul-Henning Kamp void 210afcbcfaeSPoul-Henning Kamp g_cancel_event(void *ref) 211dddc28bfSPoul-Henning Kamp { 212dddc28bfSPoul-Henning Kamp struct g_event *ep, *epn; 2132ab31b05SPoul-Henning Kamp struct g_provider *pp; 214afcbcfaeSPoul-Henning Kamp u_int n; 215dddc28bfSPoul-Henning Kamp 216dddc28bfSPoul-Henning Kamp mtx_lock(&g_eventlock); 2172ab31b05SPoul-Henning Kamp TAILQ_FOREACH(pp, &g_doorstep, orphan) { 2182ab31b05SPoul-Henning Kamp if (pp != ref) 2192ab31b05SPoul-Henning Kamp continue; 2202ab31b05SPoul-Henning Kamp TAILQ_REMOVE(&g_doorstep, pp, orphan); 2212ab31b05SPoul-Henning Kamp break; 2222ab31b05SPoul-Henning Kamp } 223afcbcfaeSPoul-Henning Kamp for (ep = TAILQ_FIRST(&g_events); ep != NULL; ep = epn) { 224dddc28bfSPoul-Henning Kamp epn = TAILQ_NEXT(ep, events); 225afcbcfaeSPoul-Henning Kamp for (n = 0; n < G_N_EVENTREFS; n++) { 226afcbcfaeSPoul-Henning Kamp if (ep->ref[n] == NULL) 227afcbcfaeSPoul-Henning Kamp break; 228afcbcfaeSPoul-Henning Kamp if (ep->ref[n] == ref) { 229dddc28bfSPoul-Henning Kamp TAILQ_REMOVE(&g_events, ep, events); 230316aed03SPoul-Henning Kamp ep->func(ep->arg, EV_CANCEL); 2310a9c130cSPoul-Henning Kamp if (ep->flag & EV_WAKEUP) { 2320a9c130cSPoul-Henning Kamp ep->flag |= EV_DONE; 2330a9c130cSPoul-Henning Kamp wakeup(ep); 2340a9c130cSPoul-Henning Kamp } else { 2350a9c130cSPoul-Henning Kamp g_destroy_event(ep); 2360a9c130cSPoul-Henning Kamp } 237afcbcfaeSPoul-Henning Kamp break; 238dddc28bfSPoul-Henning Kamp } 239afcbcfaeSPoul-Henning Kamp } 240dddc28bfSPoul-Henning Kamp } 241dddc28bfSPoul-Henning Kamp mtx_unlock(&g_eventlock); 242dddc28bfSPoul-Henning Kamp } 243dddc28bfSPoul-Henning Kamp 2440a9c130cSPoul-Henning Kamp static int 2450a9c130cSPoul-Henning Kamp g_post_event_x(g_event_t *func, void *arg, int flag, struct g_event **epp, va_list ap) 246346cd5feSPoul-Henning Kamp { 247346cd5feSPoul-Henning Kamp struct g_event *ep; 248afcbcfaeSPoul-Henning Kamp void *p; 249afcbcfaeSPoul-Henning Kamp u_int n; 250346cd5feSPoul-Henning Kamp 2510a9c130cSPoul-Henning Kamp g_trace(G_T_TOPOLOGY, "g_post_event_x(%p, %p, %d", func, arg, flag); 2528cd1535aSPoul-Henning Kamp ep = g_malloc(sizeof *ep, flag | M_ZERO); 253346cd5feSPoul-Henning Kamp if (ep == NULL) 254346cd5feSPoul-Henning Kamp return (ENOMEM); 2550a9c130cSPoul-Henning Kamp ep->flag = flag; 256afcbcfaeSPoul-Henning Kamp for (n = 0; n < G_N_EVENTREFS; n++) { 257afcbcfaeSPoul-Henning Kamp p = va_arg(ap, void *); 258afcbcfaeSPoul-Henning Kamp if (p == NULL) 259afcbcfaeSPoul-Henning Kamp break; 260afcbcfaeSPoul-Henning Kamp g_trace(G_T_TOPOLOGY, " ref %p", p); 261afcbcfaeSPoul-Henning Kamp ep->ref[n++] = p; 262afcbcfaeSPoul-Henning Kamp } 263afcbcfaeSPoul-Henning Kamp va_end(ap); 264afcbcfaeSPoul-Henning Kamp KASSERT(p == NULL, ("Too many references to event")); 265346cd5feSPoul-Henning Kamp ep->func = func; 266346cd5feSPoul-Henning Kamp ep->arg = arg; 267346cd5feSPoul-Henning Kamp mtx_lock(&g_eventlock); 268346cd5feSPoul-Henning Kamp g_pending_events++; 269346cd5feSPoul-Henning Kamp TAILQ_INSERT_TAIL(&g_events, ep, events); 270346cd5feSPoul-Henning Kamp mtx_unlock(&g_eventlock); 271346cd5feSPoul-Henning Kamp wakeup(&g_wait_event); 2720a9c130cSPoul-Henning Kamp if (epp != NULL) 2730a9c130cSPoul-Henning Kamp *epp = ep; 2740a9c130cSPoul-Henning Kamp return (0); 2750a9c130cSPoul-Henning Kamp } 2760a9c130cSPoul-Henning Kamp 2770a9c130cSPoul-Henning Kamp int 2780a9c130cSPoul-Henning Kamp g_post_event(g_event_t *func, void *arg, int flag, ...) 2790a9c130cSPoul-Henning Kamp { 2800a9c130cSPoul-Henning Kamp va_list ap; 2810a9c130cSPoul-Henning Kamp 2820a9c130cSPoul-Henning Kamp va_start(ap, flag); 2830a9c130cSPoul-Henning Kamp KASSERT(flag == M_WAITOK || flag == M_NOWAIT, 2840a9c130cSPoul-Henning Kamp ("Wrong flag to g_post_event")); 2850a9c130cSPoul-Henning Kamp return (g_post_event_x(func, arg, flag, NULL, ap)); 2860a9c130cSPoul-Henning Kamp } 2870a9c130cSPoul-Henning Kamp 2880a9c130cSPoul-Henning Kamp 2890a9c130cSPoul-Henning Kamp /* 2900a9c130cSPoul-Henning Kamp * XXX: It might actually be useful to call this function with topology held. 2910a9c130cSPoul-Henning Kamp * XXX: This would ensure that the event gets created before anything else 2920a9c130cSPoul-Henning Kamp * XXX: changes. At present all users have a handle on things in some other 2930a9c130cSPoul-Henning Kamp * XXX: way, so this remains an XXX for now. 2940a9c130cSPoul-Henning Kamp */ 2950a9c130cSPoul-Henning Kamp 2960a9c130cSPoul-Henning Kamp int 2970a9c130cSPoul-Henning Kamp g_waitfor_event(g_event_t *func, void *arg, int flag, ...) 2980a9c130cSPoul-Henning Kamp { 2990a9c130cSPoul-Henning Kamp va_list ap; 3000a9c130cSPoul-Henning Kamp struct g_event *ep; 3010a9c130cSPoul-Henning Kamp int error; 3020a9c130cSPoul-Henning Kamp 3030a9c130cSPoul-Henning Kamp /* g_topology_assert_not(); */ 3040a9c130cSPoul-Henning Kamp va_start(ap, flag); 3050a9c130cSPoul-Henning Kamp KASSERT(flag == M_WAITOK || flag == M_NOWAIT, 3060a9c130cSPoul-Henning Kamp ("Wrong flag to g_post_event")); 3070a9c130cSPoul-Henning Kamp error = g_post_event_x(func, arg, flag | EV_WAKEUP, &ep, ap); 3080a9c130cSPoul-Henning Kamp if (error) 3090a9c130cSPoul-Henning Kamp return (error); 3100a9c130cSPoul-Henning Kamp do 3110a9c130cSPoul-Henning Kamp tsleep(ep, PRIBIO, "g_waitfor_event", hz); 3120a9c130cSPoul-Henning Kamp while (!(ep->flag & EV_DONE)); 3130a9c130cSPoul-Henning Kamp g_destroy_event(ep); 314346cd5feSPoul-Henning Kamp return (0); 315346cd5feSPoul-Henning Kamp } 316346cd5feSPoul-Henning Kamp 317dd84a43cSPoul-Henning Kamp void 318dd84a43cSPoul-Henning Kamp g_event_init() 319dd84a43cSPoul-Henning Kamp { 320dd84a43cSPoul-Henning Kamp 321903e43feSPoul-Henning Kamp mtx_init(&g_eventlock, "GEOM orphanage", NULL, MTX_DEF); 322d943f1b0SPoul-Henning Kamp sx_init(&g_eventstall, "GEOM event stalling"); 323dd84a43cSPoul-Henning Kamp } 324