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.
445 lines
11 KiB
C
445 lines
11 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/malloc.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/bio.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/time.h>
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#include <sys/disk.h>
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#include <sys/fcntl.h>
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#include <sys/limits.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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static d_open_t g_dev_open;
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static d_close_t g_dev_close;
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static d_strategy_t g_dev_strategy;
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static d_ioctl_t g_dev_ioctl;
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static struct cdevsw g_dev_cdevsw = {
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.d_open = g_dev_open,
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.d_close = g_dev_close,
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.d_read = physread,
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.d_write = physwrite,
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.d_ioctl = g_dev_ioctl,
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.d_strategy = g_dev_strategy,
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.d_name = "g_dev",
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.d_maj = GEOM_MAJOR,
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.d_flags = D_DISK | D_TRACKCLOSE | D_NOGIANT,
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};
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static g_taste_t g_dev_taste;
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static g_orphan_t g_dev_orphan;
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static struct g_class g_dev_class = {
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.name = "DEV",
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.taste = g_dev_taste,
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};
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void
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g_dev_print(void)
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{
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struct g_geom *gp;
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char const *p = "";
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LIST_FOREACH(gp, &g_dev_class.geom, geom) {
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printf("%s%s", p, gp->name);
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p = " ";
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}
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printf("\n");
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}
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/*
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* XXX: This is disgusting and wrong in every way imaginable: The only reason
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* XXX: we have a clone function is because of the root-mount hack we currently
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* XXX: employ. An improvment would be to unregister this cloner once we know
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* XXX: we no longer need it. Ideally, root-fs would be mounted through DEVFS
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* XXX: eliminating the need for this hack.
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*/
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static void
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g_dev_clone(void *arg __unused, char *name, int namelen __unused, dev_t *dev)
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{
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struct g_geom *gp;
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if (*dev != NODEV)
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return;
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g_waitidle();
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/* g_topology_lock(); */
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LIST_FOREACH(gp, &g_dev_class.geom, geom) {
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if (strcmp(gp->name, name))
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continue;
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*dev = gp->softc;
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g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev);
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return;
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}
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/* g_topology_unlock(); */
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return;
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}
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static void
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g_dev_register_cloner(void *foo __unused)
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{
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static int once;
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/* XXX: why would this happen more than once ?? */
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if (!once) {
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EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000);
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once++;
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}
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}
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SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL);
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struct g_provider *
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g_dev_getprovider(dev_t dev)
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{
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struct g_consumer *cp;
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if (dev == NULL)
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return (NULL);
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if (devsw(dev) != &g_dev_cdevsw)
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return (NULL);
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cp = dev->si_drv2;
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return (cp->provider);
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}
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static struct g_geom *
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g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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static int unit = GEOM_MINOR_PROVIDERS;
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int error;
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dev_t dev;
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g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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LIST_FOREACH(cp, &pp->consumers, consumers)
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if (cp->geom->class == mp)
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return (NULL);
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gp = g_new_geomf(mp, pp->name);
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gp->orphan = g_dev_orphan;
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cp = g_new_consumer(gp);
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error = g_attach(cp, pp);
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KASSERT(error == 0,
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("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error));
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/*
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* XXX: I'm not 100% sure we can call make_dev(9) without Giant
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* yet. Once we can, we don't need to drop topology here either.
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*/
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g_topology_unlock();
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mtx_lock(&Giant);
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dev = make_dev(&g_dev_cdevsw, unit2minor(unit++),
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UID_ROOT, GID_OPERATOR, 0640, gp->name);
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if (pp->flags & G_PF_CANDELETE)
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dev->si_flags |= SI_CANDELETE;
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mtx_unlock(&Giant);
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g_topology_lock();
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dev->si_iosize_max = MAXPHYS;
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dev->si_stripesize = pp->stripesize;
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dev->si_stripeoffset = pp->stripeoffset;
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gp->softc = dev;
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dev->si_drv1 = gp;
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dev->si_drv2 = cp;
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return (gp);
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}
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static int
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g_dev_open(dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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int error, r, w, e;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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if (gp == NULL || cp == NULL || gp->softc != dev)
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return(ENXIO); /* g_dev_taste() not done yet */
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g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
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gp->name, flags, fmt, td);
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r = flags & FREAD ? 1 : 0;
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w = flags & FWRITE ? 1 : 0;
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#ifdef notyet
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e = flags & O_EXCL ? 1 : 0;
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#else
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e = 0;
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#endif
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g_topology_lock();
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if (dev->si_devsw == NULL)
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error = ENXIO; /* We were orphaned */
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else
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error = g_access(cp, r, w, e);
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g_topology_unlock();
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g_waitidle();
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if (!error)
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dev->si_bsize_phys = cp->provider->sectorsize;
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return(error);
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}
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static int
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g_dev_close(dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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int error, r, w, e, i;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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if (gp == NULL || cp == NULL)
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return(ENXIO);
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g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
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gp->name, flags, fmt, td);
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r = flags & FREAD ? -1 : 0;
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w = flags & FWRITE ? -1 : 0;
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#ifdef notyet
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e = flags & O_EXCL ? -1 : 0;
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#else
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e = 0;
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#endif
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g_topology_lock();
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if (dev->si_devsw == NULL)
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error = ENXIO; /* We were orphaned */
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else
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error = g_access(cp, r, w, e);
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for (i = 0; i < 10 * hz;) {
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if (cp->acr != 0 || cp->acw != 0)
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break;
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if (cp->nstart == cp->nend)
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break;
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tsleep(&i, PRIBIO, "gdevwclose", hz / 10);
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i += hz / 10;
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}
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if (cp->acr == 0 && cp->acw == 0 && cp->nstart != cp->nend) {
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printf("WARNING: Final close of geom_dev(%s) %s %s\n",
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gp->name,
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"still has outstanding I/O after 10 seconds.",
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"Completing close anyway, panic may happen later.");
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}
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g_topology_unlock();
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g_waitidle();
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return (error);
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}
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/*
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* XXX: Until we have unmessed the ioctl situation, there is a race against
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* XXX: a concurrent orphanization. We cannot close it by holding topology
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* XXX: since that would prevent us from doing our job, and stalling events
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* XXX: will break (actually: stall) the BSD disklabel hacks.
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*/
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static int
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g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_kerneldump kd;
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int i, error;
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u_int u;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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error = 0;
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KASSERT(cp->acr || cp->acw,
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("Consumer with zero access count in g_dev_ioctl"));
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i = IOCPARM_LEN(cmd);
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switch (cmd) {
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case DIOCGSECTORSIZE:
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*(u_int *)data = cp->provider->sectorsize;
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if (*(u_int *)data == 0)
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error = ENOENT;
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break;
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case DIOCGMEDIASIZE:
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*(off_t *)data = cp->provider->mediasize;
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if (*(off_t *)data == 0)
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error = ENOENT;
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break;
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case DIOCGFWSECTORS:
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error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
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if (error == 0 && *(u_int *)data == 0)
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error = ENOENT;
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break;
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case DIOCGFWHEADS:
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error = g_io_getattr("GEOM::fwheads", cp, &i, data);
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if (error == 0 && *(u_int *)data == 0)
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error = ENOENT;
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break;
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case DIOCGFRONTSTUFF:
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error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
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break;
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case DIOCSKERNELDUMP:
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u = *((u_int *)data);
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if (!u) {
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set_dumper(NULL);
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error = 0;
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break;
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}
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kd.offset = 0;
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kd.length = OFF_MAX;
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i = sizeof kd;
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error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd);
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if (!error)
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dev->si_flags |= SI_DUMPDEV;
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break;
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default:
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if (cp->provider->geom->ioctl != NULL) {
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error = cp->provider->geom->ioctl(cp->provider, cmd, data, td);
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} else {
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error = ENOIOCTL;
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}
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}
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g_waitidle();
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return (error);
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}
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static void
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g_dev_done(struct bio *bp2)
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{
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struct bio *bp;
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bp = bp2->bio_parent;
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bp->bio_error = bp2->bio_error;
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if (bp->bio_error != 0) {
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g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
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bp2, bp->bio_error);
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bp->bio_flags |= BIO_ERROR;
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} else {
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g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
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bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed);
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}
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bp->bio_resid = bp->bio_bcount - bp2->bio_completed;
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g_destroy_bio(bp2);
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biodone(bp);
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}
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static void
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g_dev_strategy(struct bio *bp)
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{
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struct g_consumer *cp;
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struct bio *bp2;
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dev_t dev;
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KASSERT(bp->bio_cmd == BIO_READ ||
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bp->bio_cmd == BIO_WRITE ||
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bp->bio_cmd == BIO_DELETE,
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("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
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dev = bp->bio_dev;
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cp = dev->si_drv2;
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KASSERT(cp->acr || cp->acw,
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("Consumer with zero access count in g_dev_strategy"));
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for (;;) {
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/*
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* XXX: This is not an ideal solution, but I belive it to
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* XXX: deadlock safe, all things considered.
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*/
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bp2 = g_clone_bio(bp);
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if (bp2 != NULL)
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break;
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tsleep(&bp, PRIBIO, "gdstrat", hz / 10);
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}
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KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
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bp2->bio_length = (off_t)bp->bio_bcount;
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bp2->bio_done = g_dev_done;
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g_trace(G_T_BIO,
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"g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
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bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
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bp2->bio_data, bp2->bio_cmd);
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g_io_request(bp2, cp);
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KASSERT(cp->acr || cp->acw,
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("g_dev_strategy raced with g_dev_close and lost"));
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}
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/*
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* g_dev_orphan()
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*
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* Called from below when the provider orphaned us.
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* - Clear any dump settings.
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* - Destroy the dev_t to prevent any more request from coming in. The
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* provider is already marked with an error, so anything which comes in
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* in the interrim will be returned immediately.
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* - Wait for any outstanding I/O to finish.
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* - Set our access counts to zero, whatever they were.
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* - Detach and self-destruct.
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*/
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static void
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g_dev_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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dev_t dev;
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g_topology_assert();
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gp = cp->geom;
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dev = gp->softc;
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g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name);
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/* Reset any dump-area set on this device */
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if (dev->si_flags & SI_DUMPDEV)
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set_dumper(NULL);
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/* Destroy the dev_t so we get no more requests */
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destroy_dev(dev);
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/* Wait for the cows to come home */
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while (cp->nstart != cp->nend)
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msleep(&dev, NULL, PRIBIO, "gdevorphan", hz / 10);
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if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
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g_access(cp, -cp->acr, -cp->acw, -cp->ace);
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g_detach(cp);
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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}
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DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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