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626 lines
16 KiB
C
626 lines
16 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/ctype.h>
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#include <sys/bio.h>
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#include <sys/bus.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.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 <sys/sysctl.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 g_dev_softc {
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struct mtx sc_mtx;
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struct cdev *sc_dev;
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struct cdev *sc_alias;
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int sc_open;
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int sc_active;
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};
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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_version = D_VERSION,
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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_flags = D_DISK | D_TRACKCLOSE,
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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 g_attrchanged_t g_dev_attrchanged;
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static struct g_class g_dev_class = {
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.name = "DEV",
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.version = G_VERSION,
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.taste = g_dev_taste,
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.orphan = g_dev_orphan,
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.attrchanged = g_dev_attrchanged
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};
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/*
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* We target 262144 (8 x 32768) sectors by default as this significantly
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* increases the throughput on commonly used SSD's with a marginal
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* increase in non-interruptible request latency.
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*/
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static uint64_t g_dev_del_max_sectors = 262144;
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SYSCTL_DECL(_kern_geom);
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SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff");
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SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW,
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&g_dev_del_max_sectors, 0, "Maximum number of sectors in a single "
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"delete request sent to the provider. Larger requests are chunked "
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"so they can be interrupted. (0 = disable chunking)");
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static void
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g_dev_destroy(void *arg, int flags __unused)
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{
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struct g_consumer *cp;
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struct g_geom *gp;
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struct g_dev_softc *sc;
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g_topology_assert();
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cp = arg;
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gp = cp->geom;
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sc = cp->private;
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g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name);
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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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mtx_destroy(&sc->sc_mtx);
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g_free(sc);
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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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static void
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g_dev_attrchanged(struct g_consumer *cp, const char *attr)
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{
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struct g_dev_softc *sc;
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struct cdev *dev;
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char buf[SPECNAMELEN + 6];
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sc = cp->private;
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if (strcmp(attr, "GEOM::media") == 0) {
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dev = sc->sc_dev;
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snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
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devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK);
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dev = sc->sc_alias;
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if (dev != NULL) {
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snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
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devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf,
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M_WAITOK);
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}
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return;
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}
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if (strcmp(attr, "GEOM::physpath") != 0)
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return;
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if (g_access(cp, 1, 0, 0) == 0) {
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char *physpath;
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int error, physpath_len;
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physpath_len = MAXPATHLEN;
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physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO);
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error =
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g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
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g_access(cp, -1, 0, 0);
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if (error == 0 && strlen(physpath) != 0) {
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struct cdev *old_alias_dev;
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struct cdev **alias_devp;
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dev = sc->sc_dev;
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old_alias_dev = sc->sc_alias;
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alias_devp = (struct cdev **)&sc->sc_alias;
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make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp,
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dev, old_alias_dev, physpath);
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} else if (sc->sc_alias) {
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destroy_dev((struct cdev *)sc->sc_alias);
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sc->sc_alias = NULL;
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}
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g_free(physpath);
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}
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}
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struct g_provider *
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g_dev_getprovider(struct cdev *dev)
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{
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struct g_consumer *cp;
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g_topology_assert();
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if (dev == NULL)
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return (NULL);
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if (dev->si_devsw != &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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struct g_dev_softc *sc;
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int error, len;
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struct cdev *dev, *adev;
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char buf[64], *val;
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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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gp = g_new_geomf(mp, "%s", pp->name);
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sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
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mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF);
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cp = g_new_consumer(gp);
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cp->private = sc;
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cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
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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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error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev,
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&g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name);
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if (error != 0) {
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printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n",
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__func__, gp->name, error);
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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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mtx_destroy(&sc->sc_mtx);
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g_free(sc);
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return (NULL);
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}
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dev->si_flags |= SI_UNMAPPED;
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sc->sc_dev = dev;
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/* Search for device alias name and create it if found. */
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adev = NULL;
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for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) {
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snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name);
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buf[14 + len] = 0;
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val = getenv(buf);
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if (val != NULL) {
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snprintf(buf, sizeof(buf), "%s%s",
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val, gp->name + len);
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freeenv(val);
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make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK,
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&adev, dev, "%s", buf);
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adev->si_flags |= SI_UNMAPPED;
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break;
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}
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}
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dev->si_iosize_max = MAXPHYS;
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dev->si_drv2 = cp;
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if (adev != NULL) {
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adev->si_iosize_max = MAXPHYS;
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adev->si_drv2 = cp;
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}
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g_dev_attrchanged(cp, "GEOM::physpath");
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return (gp);
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}
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static int
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g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct g_consumer *cp;
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struct g_dev_softc *sc;
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int error, r, w, e;
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cp = dev->si_drv2;
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if (cp == NULL)
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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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cp->geom->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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if (w) {
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/*
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* When running in very secure mode, do not allow
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* opens for writing of any disks.
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*/
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error = securelevel_ge(td->td_ucred, 2);
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if (error)
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return (error);
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}
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g_topology_lock();
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error = g_access(cp, r, w, e);
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g_topology_unlock();
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if (error == 0) {
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sc = cp->private;
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mtx_lock(&sc->sc_mtx);
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if (sc->sc_open == 0 && sc->sc_active != 0)
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wakeup(&sc->sc_active);
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sc->sc_open += r + w + e;
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mtx_unlock(&sc->sc_mtx);
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}
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return(error);
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}
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static int
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g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct g_consumer *cp;
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struct g_dev_softc *sc;
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int error, r, w, e;
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cp = dev->si_drv2;
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if (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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cp->geom->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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sc = cp->private;
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mtx_lock(&sc->sc_mtx);
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sc->sc_open += r + w + e;
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while (sc->sc_open == 0 && sc->sc_active != 0)
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msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0);
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mtx_unlock(&sc->sc_mtx);
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g_topology_lock();
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error = g_access(cp, r, w, e);
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g_topology_unlock();
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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(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
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{
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struct g_consumer *cp;
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struct g_provider *pp;
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struct g_kerneldump kd;
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off_t offset, length, chunk;
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int i, error;
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u_int u;
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cp = dev->si_drv2;
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pp = cp->provider;
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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, 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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error = set_dumper(&kd.di, devtoname(dev));
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if (!error)
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dev->si_flags |= SI_DUMPDEV;
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}
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break;
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case DIOCGFLUSH:
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error = g_io_flush(cp);
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break;
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case DIOCGDELETE:
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offset = ((off_t *)data)[0];
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length = ((off_t *)data)[1];
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if ((offset % cp->provider->sectorsize) != 0 ||
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(length % cp->provider->sectorsize) != 0 || length <= 0) {
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printf("%s: offset=%jd length=%jd\n", __func__, offset,
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length);
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error = EINVAL;
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break;
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}
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while (length > 0) {
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chunk = length;
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if (g_dev_del_max_sectors != 0 && chunk >
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g_dev_del_max_sectors * cp->provider->sectorsize) {
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chunk = g_dev_del_max_sectors *
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cp->provider->sectorsize;
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}
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error = g_delete_data(cp, offset, chunk);
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length -= chunk;
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offset += chunk;
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if (error)
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break;
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/*
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* Since the request size can be large, the service
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* time can be is likewise. We make this ioctl
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* interruptible by checking for signals for each bio.
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*/
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if (SIGPENDING(td))
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break;
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}
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break;
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case DIOCGIDENT:
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error = g_io_getattr("GEOM::ident", cp, &i, data);
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break;
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case DIOCGPROVIDERNAME:
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if (pp == NULL)
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return (ENOENT);
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strlcpy(data, pp->name, i);
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break;
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case DIOCGSTRIPESIZE:
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*(off_t *)data = cp->provider->stripesize;
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break;
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case DIOCGSTRIPEOFFSET:
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*(off_t *)data = cp->provider->stripeoffset;
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break;
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case DIOCGPHYSPATH:
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error = g_io_getattr("GEOM::physpath", cp, &i, data);
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if (error == 0 && *(char *)data == '\0')
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error = ENOENT;
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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, fflag, td);
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} else {
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error = ENOIOCTL;
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}
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}
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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 g_consumer *cp;
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struct g_dev_softc *sc;
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struct bio *bp;
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int destroy;
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cp = bp2->bio_from;
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sc = cp->private;
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|
bp = bp2->bio_parent;
|
|
bp->bio_error = bp2->bio_error;
|
|
bp->bio_completed = bp2->bio_completed;
|
|
bp->bio_resid = bp->bio_length - bp2->bio_completed;
|
|
if (bp2->bio_error != 0) {
|
|
g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
|
|
bp2, bp2->bio_error);
|
|
bp->bio_flags |= BIO_ERROR;
|
|
} else {
|
|
g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
|
|
bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed);
|
|
}
|
|
g_destroy_bio(bp2);
|
|
destroy = 0;
|
|
mtx_lock(&sc->sc_mtx);
|
|
if ((--sc->sc_active) == 0) {
|
|
if (sc->sc_open == 0)
|
|
wakeup(&sc->sc_active);
|
|
if (sc->sc_dev == NULL)
|
|
destroy = 1;
|
|
}
|
|
mtx_unlock(&sc->sc_mtx);
|
|
if (destroy)
|
|
g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
|
|
biodone(bp);
|
|
}
|
|
|
|
static void
|
|
g_dev_strategy(struct bio *bp)
|
|
{
|
|
struct g_consumer *cp;
|
|
struct bio *bp2;
|
|
struct cdev *dev;
|
|
struct g_dev_softc *sc;
|
|
|
|
KASSERT(bp->bio_cmd == BIO_READ ||
|
|
bp->bio_cmd == BIO_WRITE ||
|
|
bp->bio_cmd == BIO_DELETE ||
|
|
bp->bio_cmd == BIO_FLUSH,
|
|
("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
|
|
dev = bp->bio_dev;
|
|
cp = dev->si_drv2;
|
|
sc = cp->private;
|
|
KASSERT(cp->acr || cp->acw,
|
|
("Consumer with zero access count in g_dev_strategy"));
|
|
#ifdef INVARIANTS
|
|
if ((bp->bio_offset % cp->provider->sectorsize) != 0 ||
|
|
(bp->bio_bcount % cp->provider->sectorsize) != 0) {
|
|
bp->bio_resid = bp->bio_bcount;
|
|
biofinish(bp, NULL, EINVAL);
|
|
return;
|
|
}
|
|
#endif
|
|
mtx_lock(&sc->sc_mtx);
|
|
KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy"));
|
|
sc->sc_active++;
|
|
mtx_unlock(&sc->sc_mtx);
|
|
|
|
for (;;) {
|
|
/*
|
|
* XXX: This is not an ideal solution, but I belive it to
|
|
* XXX: deadlock safe, all things considered.
|
|
*/
|
|
bp2 = g_clone_bio(bp);
|
|
if (bp2 != NULL)
|
|
break;
|
|
pause("gdstrat", hz / 10);
|
|
}
|
|
KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
|
|
bp2->bio_done = g_dev_done;
|
|
g_trace(G_T_BIO,
|
|
"g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
|
|
bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
|
|
bp2->bio_data, bp2->bio_cmd);
|
|
g_io_request(bp2, cp);
|
|
KASSERT(cp->acr || cp->acw,
|
|
("g_dev_strategy raced with g_dev_close and lost"));
|
|
|
|
}
|
|
|
|
/*
|
|
* g_dev_callback()
|
|
*
|
|
* Called by devfs when asynchronous device destruction is completed.
|
|
* - Mark that we have no attached device any more.
|
|
* - If there are no outstanding requests, schedule geom destruction.
|
|
* Otherwise destruction will be scheduled later by g_dev_done().
|
|
*/
|
|
|
|
static void
|
|
g_dev_callback(void *arg)
|
|
{
|
|
struct g_consumer *cp;
|
|
struct g_dev_softc *sc;
|
|
int destroy;
|
|
|
|
cp = arg;
|
|
sc = cp->private;
|
|
g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name);
|
|
|
|
mtx_lock(&sc->sc_mtx);
|
|
sc->sc_dev = NULL;
|
|
sc->sc_alias = NULL;
|
|
destroy = (sc->sc_active == 0);
|
|
mtx_unlock(&sc->sc_mtx);
|
|
if (destroy)
|
|
g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
|
|
}
|
|
|
|
/*
|
|
* g_dev_orphan()
|
|
*
|
|
* Called from below when the provider orphaned us.
|
|
* - Clear any dump settings.
|
|
* - Request asynchronous device destruction to prevent any more requests
|
|
* from coming in. The provider is already marked with an error, so
|
|
* anything which comes in in the interrim will be returned immediately.
|
|
*/
|
|
|
|
static void
|
|
g_dev_orphan(struct g_consumer *cp)
|
|
{
|
|
struct cdev *dev;
|
|
struct g_dev_softc *sc;
|
|
|
|
g_topology_assert();
|
|
sc = cp->private;
|
|
dev = sc->sc_dev;
|
|
g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name);
|
|
|
|
/* Reset any dump-area set on this device */
|
|
if (dev->si_flags & SI_DUMPDEV)
|
|
set_dumper(NULL, NULL);
|
|
|
|
/* Destroy the struct cdev *so we get no more requests */
|
|
destroy_dev_sched_cb(dev, g_dev_callback, cp);
|
|
}
|
|
|
|
DECLARE_GEOM_CLASS(g_dev_class, g_dev);
|