d2bae332d6
shown that it is not useful. Rename the relative count g_access_rel() function to g_access(), only the name has changed. Change all g_access_rel() calls in our CVS tree to call g_access() instead. Add an #ifndef BURN_BRIDGES #define of g_access_rel() for source code compatibility.
856 lines
21 KiB
C
856 lines
21 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/devicestat.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/errno.h>
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#include <sys/sbuf.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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#include <machine/stdarg.h>
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struct class_list_head g_classes = LIST_HEAD_INITIALIZER(g_classes);
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static struct g_tailq_head geoms = TAILQ_HEAD_INITIALIZER(geoms);
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char *g_wait_event, *g_wait_up, *g_wait_down, *g_wait_sim;
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static int g_valid_obj(void const *ptr);
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struct g_hh00 {
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struct g_class *mp;
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int error;
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};
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/*
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* This event offers a new class a chance to taste all preexisting providers.
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*/
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static void
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g_load_class(void *arg, int flag)
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{
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struct g_hh00 *hh;
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struct g_class *mp2, *mp;
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struct g_geom *gp;
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struct g_provider *pp;
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g_topology_assert();
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if (flag == EV_CANCEL) /* XXX: can't happen ? */
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return;
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if (g_shutdown)
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return;
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hh = arg;
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mp = hh->mp;
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g_free(hh);
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g_trace(G_T_TOPOLOGY, "g_load_class(%s)", mp->name);
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KASSERT(mp->name != NULL && *mp->name != '\0',
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("GEOM class has no name"));
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LIST_FOREACH(mp2, &g_classes, class) {
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KASSERT(mp2 != mp,
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("The GEOM class %s already loaded", mp2->name));
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KASSERT(strcmp(mp2->name, mp->name) != 0,
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("A GEOM class named %s is already loaded", mp2->name));
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}
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LIST_INIT(&mp->geom);
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LIST_INSERT_HEAD(&g_classes, mp, class);
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if (mp->init != NULL)
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mp->init(mp);
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if (mp->taste == NULL)
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return;
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LIST_FOREACH(mp2, &g_classes, class) {
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if (mp == mp2)
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continue;
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LIST_FOREACH(gp, &mp2->geom, geom) {
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LIST_FOREACH(pp, &gp->provider, provider) {
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mp->taste(mp, 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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}
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static void
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g_unload_class(void *arg, int flag)
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{
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struct g_hh00 *hh;
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struct g_class *mp;
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struct g_geom *gp;
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struct g_provider *pp;
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struct g_consumer *cp;
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int error;
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g_topology_assert();
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hh = arg;
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mp = hh->mp;
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g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name);
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/*
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* We allow unloading if we have no geoms, or a class
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* method we can use to get rid of them.
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*/
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if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) {
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hh->error = EOPNOTSUPP;
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return;
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}
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/* We refuse to unload if anything is open */
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LIST_FOREACH(gp, &mp->geom, geom) {
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LIST_FOREACH(pp, &gp->provider, provider)
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if (pp->acr || pp->acw || pp->ace) {
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hh->error = EBUSY;
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return;
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}
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LIST_FOREACH(cp, &gp->consumer, consumer)
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if (cp->acr || cp->acw || cp->ace) {
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hh->error = EBUSY;
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return;
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}
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}
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/* Bar new entries */
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mp->taste = NULL;
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mp->config = NULL;
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error = 0;
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LIST_FOREACH(gp, &mp->geom, geom) {
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error = mp->destroy_geom(NULL, mp, gp);
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if (error != 0)
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break;
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}
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if (error == 0) {
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if (mp->fini != NULL)
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mp->fini(mp);
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LIST_REMOVE(mp, class);
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}
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hh->error = error;
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return;
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}
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int
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g_modevent(module_t mod, int type, void *data)
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{
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struct g_hh00 *hh;
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int error;
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static int g_ignition;
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if (!g_ignition) {
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g_ignition++;
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g_init();
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}
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hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
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hh->mp = data;
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error = EOPNOTSUPP;
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switch (type) {
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case MOD_LOAD:
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g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", hh->mp->name);
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g_post_event(g_load_class, hh, M_WAITOK, NULL);
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error = 0;
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break;
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case MOD_UNLOAD:
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g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", hh->mp->name);
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error = g_waitfor_event(g_unload_class, hh, M_WAITOK, NULL);
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if (error == 0)
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error = hh->error;
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if (error == 0) {
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g_waitidle();
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KASSERT(LIST_EMPTY(&hh->mp->geom),
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("Unloaded class (%s) still has geom", hh->mp->name));
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}
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g_free(hh);
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break;
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default:
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g_free(hh);
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break;
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}
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return (error);
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}
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struct g_geom *
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g_new_geomf(struct g_class *mp, const char *fmt, ...)
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{
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struct g_geom *gp;
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va_list ap;
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struct sbuf *sb;
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g_topology_assert();
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KASSERT(g_valid_obj(mp), ("g_new_geom_f() on alien class %p", mp));
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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va_start(ap, fmt);
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sbuf_vprintf(sb, fmt, ap);
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va_end(ap);
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sbuf_finish(sb);
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gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO);
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gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
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gp->class = mp;
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gp->rank = 1;
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LIST_INIT(&gp->consumer);
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LIST_INIT(&gp->provider);
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LIST_INSERT_HEAD(&mp->geom, gp, geom);
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TAILQ_INSERT_HEAD(&geoms, gp, geoms);
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strcpy(gp->name, sbuf_data(sb));
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sbuf_delete(sb);
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return (gp);
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}
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void
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g_destroy_geom(struct g_geom *gp)
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{
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g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name);
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g_topology_assert();
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KASSERT(LIST_EMPTY(&gp->consumer),
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("g_destroy_geom(%s) with consumer(s) [%p]",
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gp->name, LIST_FIRST(&gp->consumer)));
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KASSERT(LIST_EMPTY(&gp->provider),
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("g_destroy_geom(%s) with provider(s) [%p]",
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gp->name, LIST_FIRST(&gp->provider)));
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g_cancel_event(gp);
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LIST_REMOVE(gp, geom);
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TAILQ_REMOVE(&geoms, gp, geoms);
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g_free(gp->name);
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g_free(gp);
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}
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/*
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* This function is called (repeatedly) until has withered away.
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*/
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void
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g_wither_geom(struct g_geom *gp, int error)
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{
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struct g_provider *pp, *pp2;
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struct g_consumer *cp, *cp2;
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static int once_is_enough;
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if (once_is_enough)
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return;
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once_is_enough = 1;
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g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name);
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g_topology_assert();
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if (!(gp->flags & G_GEOM_WITHER)) {
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gp->flags |= G_GEOM_WITHER;
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LIST_FOREACH(pp, &gp->provider, provider)
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g_orphan_provider(pp, error);
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}
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for (pp = LIST_FIRST(&gp->provider); pp != NULL; pp = pp2) {
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pp2 = LIST_NEXT(pp, provider);
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if (!LIST_EMPTY(&pp->consumers))
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continue;
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g_destroy_provider(pp);
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}
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for (cp = LIST_FIRST(&gp->consumer); cp != NULL; cp = cp2) {
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cp2 = LIST_NEXT(cp, consumer);
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if (cp->acr || cp->acw || cp->ace)
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continue;
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g_detach(cp);
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g_destroy_consumer(cp);
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}
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if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer))
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g_destroy_geom(gp);
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once_is_enough = 0;
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}
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struct g_consumer *
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g_new_consumer(struct g_geom *gp)
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{
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struct g_consumer *cp;
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g_topology_assert();
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KASSERT(!(gp->flags & G_GEOM_WITHER),
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("g_new_consumer on WITHERing geom(%s) (class %s)",
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gp->name, gp->class->name));
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KASSERT(gp->orphan != NULL,
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("g_new_consumer on geom(%s) (class %s) without orphan",
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gp->name, gp->class->name));
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cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO);
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cp->geom = gp;
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cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED,
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DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
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LIST_INSERT_HEAD(&gp->consumer, cp, consumer);
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return(cp);
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}
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void
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g_destroy_consumer(struct g_consumer *cp)
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{
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struct g_geom *gp;
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g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp);
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g_topology_assert();
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KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached"));
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KASSERT (cp->acr == 0, ("g_destroy_consumer with acr"));
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KASSERT (cp->acw == 0, ("g_destroy_consumer with acw"));
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KASSERT (cp->ace == 0, ("g_destroy_consumer with ace"));
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g_cancel_event(cp);
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gp = cp->geom;
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LIST_REMOVE(cp, consumer);
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devstat_remove_entry(cp->stat);
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g_free(cp);
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if (gp->flags & G_GEOM_WITHER)
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g_wither_geom(gp, 0);
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}
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static void
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g_new_provider_event(void *arg, int flag)
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{
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struct g_class *mp;
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struct g_provider *pp;
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struct g_consumer *cp;
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int i;
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g_topology_assert();
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if (flag == EV_CANCEL)
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return;
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if (g_shutdown)
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return;
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pp = arg;
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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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i = 1;
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LIST_FOREACH(cp, &pp->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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continue;
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mp->taste(mp, pp, 0);
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g_topology_assert();
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/*
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* XXX: Bandaid for 5.2-RELEASE
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* XXX: DO NOT REPLICATE THIS CODE!
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*/
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if (!g_valid_obj(pp)) {
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printf("g_provider %p disappeared while tasting\n", pp);
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return;
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}
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}
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}
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struct g_provider *
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g_new_providerf(struct g_geom *gp, const char *fmt, ...)
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{
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struct g_provider *pp;
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struct sbuf *sb;
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va_list ap;
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g_topology_assert();
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KASSERT(gp->start != NULL,
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("new provider on geom(%s) without ->start (class %s)",
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gp->name, gp->class->name));
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KASSERT(!(gp->flags & G_GEOM_WITHER),
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("new provider on WITHERing geom(%s) (class %s)",
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gp->name, gp->class->name));
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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va_start(ap, fmt);
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sbuf_vprintf(sb, fmt, ap);
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va_end(ap);
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sbuf_finish(sb);
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pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
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pp->name = (char *)(pp + 1);
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strcpy(pp->name, sbuf_data(sb));
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sbuf_delete(sb);
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LIST_INIT(&pp->consumers);
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pp->error = ENXIO;
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pp->geom = gp;
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pp->stat = devstat_new_entry(pp, -1, 0, DEVSTAT_ALL_SUPPORTED,
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DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
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LIST_INSERT_HEAD(&gp->provider, pp, provider);
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g_post_event(g_new_provider_event, pp, M_WAITOK, pp, NULL);
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return (pp);
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}
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void
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g_error_provider(struct g_provider *pp, int error)
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{
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pp->error = error;
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}
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struct g_provider *
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g_provider_by_name(char const *arg)
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{
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struct g_class *cp;
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struct g_geom *gp;
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struct g_provider *pp;
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LIST_FOREACH(cp, &g_classes, class) {
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LIST_FOREACH(gp, &cp->geom, geom) {
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LIST_FOREACH(pp, &gp->provider, provider) {
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if (!strcmp(arg, pp->name))
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return (pp);
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}
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}
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}
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return (NULL);
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}
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|
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void
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g_destroy_provider(struct g_provider *pp)
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{
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struct g_geom *gp;
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g_topology_assert();
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KASSERT(LIST_EMPTY(&pp->consumers),
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("g_destroy_provider but attached"));
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KASSERT (pp->acr == 0, ("g_destroy_provider with acr"));
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KASSERT (pp->acw == 0, ("g_destroy_provider with acw"));
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KASSERT (pp->acw == 0, ("g_destroy_provider with ace"));
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g_cancel_event(pp);
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LIST_REMOVE(pp, provider);
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gp = pp->geom;
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devstat_remove_entry(pp->stat);
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g_free(pp);
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if ((gp->flags & G_GEOM_WITHER))
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g_wither_geom(gp, 0);
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}
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/*
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* We keep the "geoms" list sorted by topological order (== increasing
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* numerical rank) at all times.
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* When an attach is done, the attaching geoms rank is invalidated
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* and it is moved to the tail of the list.
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* All geoms later in the sequence has their ranks reevaluated in
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* sequence. If we cannot assign rank to a geom because it's
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* prerequisites do not have rank, we move that element to the tail
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* of the sequence with invalid rank as well.
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* At some point we encounter our original geom and if we stil fail
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* to assign it a rank, there must be a loop and we fail back to
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* g_attach() which detach again and calls redo_rank again
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* to fix up the damage.
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* It would be much simpler code wise to do it recursively, but we
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* can't risk that on the kernel stack.
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*/
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static int
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redo_rank(struct g_geom *gp)
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{
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struct g_consumer *cp;
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struct g_geom *gp1, *gp2;
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int n, m;
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g_topology_assert();
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/* Invalidate this geoms rank and move it to the tail */
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gp1 = TAILQ_NEXT(gp, geoms);
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if (gp1 != NULL) {
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gp->rank = 0;
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TAILQ_REMOVE(&geoms, gp, geoms);
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TAILQ_INSERT_TAIL(&geoms, gp, geoms);
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} else {
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gp1 = gp;
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}
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/* re-rank the rest of the sequence */
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for (; gp1 != NULL; gp1 = gp2) {
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gp1->rank = 0;
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m = 1;
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LIST_FOREACH(cp, &gp1->consumer, consumer) {
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if (cp->provider == NULL)
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continue;
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n = cp->provider->geom->rank;
|
|
if (n == 0) {
|
|
m = 0;
|
|
break;
|
|
} else if (n >= m)
|
|
m = n + 1;
|
|
}
|
|
gp1->rank = m;
|
|
gp2 = TAILQ_NEXT(gp1, geoms);
|
|
|
|
/* got a rank, moving on */
|
|
if (m != 0)
|
|
continue;
|
|
|
|
/* no rank to original geom means loop */
|
|
if (gp == gp1)
|
|
return (ELOOP);
|
|
|
|
/* no rank, put it at the end move on */
|
|
TAILQ_REMOVE(&geoms, gp1, geoms);
|
|
TAILQ_INSERT_TAIL(&geoms, gp1, geoms);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
g_attach(struct g_consumer *cp, struct g_provider *pp)
|
|
{
|
|
int error;
|
|
|
|
g_topology_assert();
|
|
KASSERT(cp->provider == NULL, ("attach but attached"));
|
|
cp->provider = pp;
|
|
LIST_INSERT_HEAD(&pp->consumers, cp, consumers);
|
|
error = redo_rank(cp->geom);
|
|
if (error) {
|
|
LIST_REMOVE(cp, consumers);
|
|
cp->provider = NULL;
|
|
redo_rank(cp->geom);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
g_detach(struct g_consumer *cp)
|
|
{
|
|
struct g_provider *pp;
|
|
|
|
g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp);
|
|
KASSERT(cp != (void*)0xd0d0d0d0, ("ARGH!"));
|
|
g_topology_assert();
|
|
KASSERT(cp->provider != NULL, ("detach but not attached"));
|
|
KASSERT(cp->acr == 0, ("detach but nonzero acr"));
|
|
KASSERT(cp->acw == 0, ("detach but nonzero acw"));
|
|
KASSERT(cp->ace == 0, ("detach but nonzero ace"));
|
|
KASSERT(cp->nstart == cp->nend,
|
|
("detach with active requests"));
|
|
pp = cp->provider;
|
|
LIST_REMOVE(cp, consumers);
|
|
cp->provider = NULL;
|
|
if (pp->geom->flags & G_GEOM_WITHER)
|
|
g_wither_geom(pp->geom, 0);
|
|
else if (pp->flags & G_PF_WITHER)
|
|
g_destroy_provider(pp);
|
|
redo_rank(cp->geom);
|
|
}
|
|
|
|
/*
|
|
* g_access()
|
|
*
|
|
* Access-check with delta values. The question asked is "can provider
|
|
* "cp" change the access counters by the relative amounts dc[rwe] ?"
|
|
*/
|
|
|
|
int
|
|
g_access(struct g_consumer *cp, int dcr, int dcw, int dce)
|
|
{
|
|
struct g_provider *pp;
|
|
int pr,pw,pe;
|
|
int error;
|
|
|
|
pp = cp->provider;
|
|
|
|
g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)",
|
|
cp, pp->name, dcr, dcw, dce);
|
|
|
|
g_topology_assert();
|
|
KASSERT(cp->provider != NULL, ("access but not attached"));
|
|
KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr"));
|
|
KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw"));
|
|
KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace"));
|
|
KASSERT(dcr != 0 || dcw != 0 || dce != 0, ("NOP access request"));
|
|
KASSERT(pp->geom->access != NULL, ("NULL geom->access"));
|
|
|
|
/*
|
|
* If our class cares about being spoiled, and we have been, we
|
|
* are probably just ahead of the event telling us that. Fail
|
|
* now rather than having to unravel this later.
|
|
*/
|
|
if (cp->geom->spoiled != NULL && cp->spoiled) {
|
|
KASSERT(dcr <= 0, ("spoiled but dcr = %d", dcr));
|
|
KASSERT(dcw <= 0, ("spoiled but dcw = %d", dcw));
|
|
KASSERT(dce <= 0, ("spoiled but dce = %d", dce));
|
|
}
|
|
|
|
/*
|
|
* Figure out what counts the provider would have had, if this
|
|
* consumer had (r0w0e0) at this time.
|
|
*/
|
|
pr = pp->acr - cp->acr;
|
|
pw = pp->acw - cp->acw;
|
|
pe = pp->ace - cp->ace;
|
|
|
|
g_trace(G_T_ACCESS,
|
|
"open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)",
|
|
dcr, dcw, dce,
|
|
cp->acr, cp->acw, cp->ace,
|
|
pp->acr, pp->acw, pp->ace,
|
|
pp, pp->name);
|
|
|
|
/* If foot-shooting is enabled, any open on rank#1 is OK */
|
|
if ((g_debugflags & 16) && pp->geom->rank == 1)
|
|
;
|
|
/* If we try exclusive but already write: fail */
|
|
else if (dce > 0 && pw > 0)
|
|
return (EPERM);
|
|
/* If we try write but already exclusive: fail */
|
|
else if (dcw > 0 && pe > 0)
|
|
return (EPERM);
|
|
/* If we try to open more but provider is error'ed: fail */
|
|
else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0)
|
|
return (pp->error);
|
|
|
|
/* Ok then... */
|
|
|
|
error = pp->geom->access(pp, dcr, dcw, dce);
|
|
if (!error) {
|
|
/*
|
|
* If we open first write, spoil any partner consumers.
|
|
* If we close last write, trigger re-taste.
|
|
*/
|
|
if (pp->acw == 0 && dcw != 0)
|
|
g_spoil(pp, cp);
|
|
else if (pp->acw != 0 && pp->acw == -dcw &&
|
|
!(pp->geom->flags & G_GEOM_WITHER))
|
|
g_post_event(g_new_provider_event, pp, M_WAITOK,
|
|
pp, NULL);
|
|
|
|
pp->acr += dcr;
|
|
pp->acw += dcw;
|
|
pp->ace += dce;
|
|
cp->acr += dcr;
|
|
cp->acw += dcw;
|
|
cp->ace += dce;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
g_handleattr_int(struct bio *bp, const char *attribute, int val)
|
|
{
|
|
|
|
return (g_handleattr(bp, attribute, &val, sizeof val));
|
|
}
|
|
|
|
int
|
|
g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val)
|
|
{
|
|
|
|
return (g_handleattr(bp, attribute, &val, sizeof val));
|
|
}
|
|
|
|
int
|
|
g_handleattr(struct bio *bp, const char *attribute, void *val, int len)
|
|
{
|
|
int error;
|
|
|
|
if (strcmp(bp->bio_attribute, attribute))
|
|
return (0);
|
|
if (bp->bio_length != len) {
|
|
printf("bio_length %jd len %d -> EFAULT\n",
|
|
(intmax_t)bp->bio_length, len);
|
|
error = EFAULT;
|
|
} else {
|
|
error = 0;
|
|
bcopy(val, bp->bio_data, len);
|
|
bp->bio_completed = len;
|
|
}
|
|
g_io_deliver(bp, error);
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
g_std_access(struct g_provider *pp __unused,
|
|
int dr __unused, int dw __unused, int de __unused)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
g_std_done(struct bio *bp)
|
|
{
|
|
struct bio *bp2;
|
|
|
|
bp2 = bp->bio_parent;
|
|
if (bp2->bio_error == 0)
|
|
bp2->bio_error = bp->bio_error;
|
|
bp2->bio_completed += bp->bio_completed;
|
|
g_destroy_bio(bp);
|
|
bp2->bio_inbed++;
|
|
if (bp2->bio_children == bp2->bio_inbed)
|
|
g_io_deliver(bp2, bp2->bio_error);
|
|
}
|
|
|
|
/* XXX: maybe this is only g_slice_spoiled */
|
|
|
|
void
|
|
g_std_spoiled(struct g_consumer *cp)
|
|
{
|
|
struct g_geom *gp;
|
|
struct g_provider *pp;
|
|
|
|
g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp);
|
|
g_topology_assert();
|
|
g_detach(cp);
|
|
gp = cp->geom;
|
|
LIST_FOREACH(pp, &gp->provider, provider)
|
|
g_orphan_provider(pp, ENXIO);
|
|
g_destroy_consumer(cp);
|
|
if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer))
|
|
g_destroy_geom(gp);
|
|
else
|
|
gp->flags |= G_GEOM_WITHER;
|
|
}
|
|
|
|
/*
|
|
* Spoiling happens when a provider is opened for writing, but consumers
|
|
* which are configured by in-band data are attached (slicers for instance).
|
|
* Since the write might potentially change the in-band data, such consumers
|
|
* need to re-evaluate their existence after the writing session closes.
|
|
* We do this by (offering to) tear them down when the open for write happens
|
|
* in return for a re-taste when it closes again.
|
|
* Together with the fact that such consumers grab an 'e' bit whenever they
|
|
* are open, regardless of mode, this ends up DTRT.
|
|
*/
|
|
|
|
static void
|
|
g_spoil_event(void *arg, int flag)
|
|
{
|
|
struct g_provider *pp;
|
|
struct g_consumer *cp, *cp2;
|
|
|
|
g_topology_assert();
|
|
if (flag == EV_CANCEL)
|
|
return;
|
|
pp = arg;
|
|
for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) {
|
|
cp2 = LIST_NEXT(cp, consumers);
|
|
if (!cp->spoiled)
|
|
continue;
|
|
cp->spoiled = 0;
|
|
if (cp->geom->spoiled == NULL)
|
|
continue;
|
|
cp->geom->spoiled(cp);
|
|
g_topology_assert();
|
|
}
|
|
}
|
|
|
|
void
|
|
g_spoil(struct g_provider *pp, struct g_consumer *cp)
|
|
{
|
|
struct g_consumer *cp2;
|
|
|
|
g_topology_assert();
|
|
|
|
LIST_FOREACH(cp2, &pp->consumers, consumers) {
|
|
if (cp2 == cp)
|
|
continue;
|
|
/*
|
|
KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr));
|
|
KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw));
|
|
*/
|
|
KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace));
|
|
cp2->spoiled++;
|
|
}
|
|
g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL);
|
|
}
|
|
|
|
int
|
|
g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len)
|
|
{
|
|
int error, i;
|
|
|
|
i = len;
|
|
error = g_io_getattr(attr, cp, &i, var);
|
|
if (error)
|
|
return (error);
|
|
if (i != len)
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* XXX: Bandaid for 5.2.
|
|
* XXX: DO NOT EVEN THINK ABOUT CALLING THIS FUNCTION!
|
|
*/
|
|
static int
|
|
g_valid_obj(void const *ptr)
|
|
{
|
|
struct g_class *mp;
|
|
struct g_geom *gp;
|
|
struct g_consumer *cp;
|
|
struct g_provider *pp;
|
|
|
|
g_topology_assert();
|
|
LIST_FOREACH(mp, &g_classes, class) {
|
|
if (ptr == mp)
|
|
return (1);
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
if (ptr == gp)
|
|
return (1);
|
|
LIST_FOREACH(cp, &gp->consumer, consumer)
|
|
if (ptr == cp)
|
|
return (1);
|
|
LIST_FOREACH(pp, &gp->provider, provider)
|
|
if (ptr == pp)
|
|
return (1);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Check if the given pointer is a live object
|
|
*/
|
|
|
|
void
|
|
g_sanity(void const *ptr)
|
|
{
|
|
struct g_class *mp;
|
|
struct g_geom *gp;
|
|
struct g_consumer *cp;
|
|
struct g_provider *pp;
|
|
|
|
if (!(g_debugflags & 0x8))
|
|
return;
|
|
LIST_FOREACH(mp, &g_classes, class) {
|
|
KASSERT(mp != ptr, ("Ptr is live class"));
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
KASSERT(gp != ptr, ("Ptr is live geom"));
|
|
KASSERT(gp->name != ptr, ("Ptr is live geom's name"));
|
|
LIST_FOREACH(cp, &gp->consumer, consumer) {
|
|
KASSERT(cp != ptr, ("Ptr is live consumer"));
|
|
}
|
|
LIST_FOREACH(pp, &gp->provider, provider) {
|
|
KASSERT(pp != ptr, ("Ptr is live provider"));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|