1b464bd889
When we orphan/wither a provider, an attached geom+consumer could end up being withered as a result and it may be in front of us in the normal object scanning order so we need to do multi-pass. On the other hand, there may be withering stuff we can't get rid off (yet), so we need to keep track of both the existence of withering stuff and if there is more we can do at this time.
883 lines
22 KiB
C
883 lines
22 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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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_VALID_CLASS(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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for (;;) {
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gp = LIST_FIRST(&mp->geom);
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if (gp == NULL)
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break;
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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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G_VALID_CLASS(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_topology_assert();
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G_VALID_GEOM(gp);
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g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name);
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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 the 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;
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g_topology_assert();
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G_VALID_GEOM(gp);
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g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name);
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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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if (!(pp->flags & G_PF_ORPHAN))
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g_orphan_provider(pp, error);
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}
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g_do_wither();
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}
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/*
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* This function is called (repeatedly) until we cant wash away more
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* withered bits at present. Return value contains two bits. Bit 0
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* set means "withering stuff we can't wash now", bit 1 means "call
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* me again, there may be stuff I didn't get the first time around.
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*/
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int
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g_wither_washer()
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{
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struct g_class *mp;
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struct g_geom *gp, *gp2;
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struct g_provider *pp, *pp2;
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struct g_consumer *cp, *cp2;
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int result;
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result = 0;
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g_topology_assert();
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LIST_FOREACH(mp, &g_classes, class) {
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LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
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LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
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if (!(pp->flags & G_PF_WITHER))
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continue;
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if (LIST_EMPTY(&pp->consumers))
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g_destroy_provider(pp);
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else
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result |= 1;
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}
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if (!(gp->flags & G_GEOM_WITHER))
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continue;
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LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
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if (LIST_EMPTY(&pp->consumers))
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g_destroy_provider(pp);
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else
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result |= 1;
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}
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LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp2) {
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if (cp->acr || cp->acw || cp->ace) {
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result |= 1;
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continue;
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}
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g_detach(cp);
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g_destroy_consumer(cp);
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result |= 2;
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}
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if (LIST_EMPTY(&gp->provider) &&
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LIST_EMPTY(&gp->consumer))
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g_destroy_geom(gp);
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else
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result |= 1;
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}
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}
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return (result);
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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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G_VALID_GEOM(gp);
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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_topology_assert();
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G_VALID_CONSUMER(cp);
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g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp);
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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_do_wither();
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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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G_VALID_PROVIDER(pp);
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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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}
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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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G_VALID_GEOM(gp);
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KASSERT(gp->access != NULL,
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("new provider on geom(%s) without ->access (class %s)",
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gp->name, gp->class->name));
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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, gp, 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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/* G_VALID_PROVIDER(pp); We may not have g_topology */
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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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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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G_VALID_PROVIDER(pp);
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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_do_wither();
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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
|
|
* prerequisites do not have rank, we move that element to the tail
|
|
* of the sequence with invalid rank as well.
|
|
* At some point we encounter our original geom and if we stil fail
|
|
* to assign it a rank, there must be a loop and we fail back to
|
|
* g_attach() which detach again and calls redo_rank again
|
|
* to fix up the damage.
|
|
* It would be much simpler code wise to do it recursively, but we
|
|
* can't risk that on the kernel stack.
|
|
*/
|
|
|
|
static int
|
|
redo_rank(struct g_geom *gp)
|
|
{
|
|
struct g_consumer *cp;
|
|
struct g_geom *gp1, *gp2;
|
|
int n, m;
|
|
|
|
g_topology_assert();
|
|
G_VALID_GEOM(gp);
|
|
|
|
/* Invalidate this geoms rank and move it to the tail */
|
|
gp1 = TAILQ_NEXT(gp, geoms);
|
|
if (gp1 != NULL) {
|
|
gp->rank = 0;
|
|
TAILQ_REMOVE(&geoms, gp, geoms);
|
|
TAILQ_INSERT_TAIL(&geoms, gp, geoms);
|
|
} else {
|
|
gp1 = gp;
|
|
}
|
|
|
|
/* re-rank the rest of the sequence */
|
|
for (; gp1 != NULL; gp1 = gp2) {
|
|
gp1->rank = 0;
|
|
m = 1;
|
|
LIST_FOREACH(cp, &gp1->consumer, consumer) {
|
|
if (cp->provider == NULL)
|
|
continue;
|
|
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();
|
|
G_VALID_CONSUMER(cp);
|
|
G_VALID_PROVIDER(pp);
|
|
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_topology_assert();
|
|
G_VALID_CONSUMER(cp);
|
|
g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp);
|
|
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_do_wither();
|
|
else if (pp->flags & G_PF_WITHER)
|
|
g_do_wither();
|
|
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;
|
|
|
|
g_topology_assert();
|
|
G_VALID_CONSUMER(cp);
|
|
pp = cp->provider;
|
|
KASSERT(pp != NULL, ("access but not attached"));
|
|
G_VALID_PROVIDER(pp);
|
|
|
|
g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)",
|
|
cp, pp->name, dcr, dcw, dce);
|
|
|
|
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 &&
|
|
(dcr > 0 || dcw > 0 || dce > 0))
|
|
return (ENXIO);
|
|
|
|
/*
|
|
* 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);
|
|
KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0,
|
|
("Geom provider %s::%s failed closing ->access()",
|
|
pp->geom->class->name, pp->name));
|
|
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,
|
|
int dr __unused, int dw __unused, int de __unused)
|
|
{
|
|
|
|
g_topology_assert();
|
|
G_VALID_PROVIDER(pp);
|
|
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_topology_assert();
|
|
G_VALID_CONSUMER(cp);
|
|
g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp);
|
|
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;
|
|
G_VALID_PROVIDER(pp);
|
|
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();
|
|
G_VALID_PROVIDER(pp);
|
|
G_VALID_CONSUMER(cp);
|
|
|
|
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);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* This function walks (topologically unsafely) the mesh and return a
|
|
* non-zero integer if it finds the argument pointer is an object.
|
|
* The return value indicates which type of object it is belived to be.
|
|
* If topology is not locked, this function is potentially dangerous,
|
|
* but since it is for debugging purposes and can be useful for instance
|
|
* from DDB, we do not assert topology lock is held.
|
|
*/
|
|
int
|
|
g_valid_obj(void const *ptr)
|
|
{
|
|
struct g_class *mp;
|
|
struct g_geom *gp;
|
|
struct g_consumer *cp;
|
|
struct g_provider *pp;
|
|
|
|
LIST_FOREACH(mp, &g_classes, class) {
|
|
if (ptr == mp)
|
|
return (1);
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
if (ptr == gp)
|
|
return (2);
|
|
LIST_FOREACH(cp, &gp->consumer, consumer)
|
|
if (ptr == cp)
|
|
return (3);
|
|
LIST_FOREACH(pp, &gp->provider, provider)
|
|
if (ptr == pp)
|
|
return (4);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
#endif
|