First commit of the GEOM subsystem to make it easier for people to

test and play with this.

This is not yet production quality and should be run only on dedicated
test boxes.

For people who want to develop transformations for GEOM there exist a
set of shims to run geom in userland (ask phk@freebsd.org).

Reports of all kinds to: phk@freebsd.org
Please include in report:
        dmesg
        sysctl debug.geomdot
        sysctl debug.geomconf

Known significant limitations:
        no kernel dump facility.
        ioctls severely restricted.

Sponsored by:   DARPA, NAI Labs

1 files changed, 382 insertions, 0 deletions

diff --git a/sys/geom/geom_dev.c b/sys/geom/geom_dev.c
new file mode 100644
index 0000000..16f4ad5
--- /dev/null
+++ b/sys/geom/geom_dev.c
@@ -0,0 +1,382 @@
+/*-
+ * Copyright (c) 2002 Poul-Henning Kamp
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by Poul-Henning Kamp
+ * and NAI Labs, the Security Research Division of Network Associates, Inc.
+ * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
+ * DARPA CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/conf.h>
+#include <sys/bio.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/disk.h>
+#include <sys/fcntl.h>
+#include <geom/geom.h>
+
+
+#define CDEV_MAJOR	4
+
+static d_open_t		g_dev_open;
+static d_close_t	g_dev_close;
+static d_strategy_t	g_dev_strategy;
+static d_ioctl_t	g_dev_ioctl;
+static d_psize_t	g_dev_psize;
+
+static struct cdevsw g_dev_cdevsw = {
+        /* open */      g_dev_open,
+        /* close */     g_dev_close,
+        /* read */      physread,
+        /* write */     physwrite,
+        /* ioctl */     g_dev_ioctl,
+        /* poll */      nopoll,
+        /* mmap */      nommap,
+        /* strategy */  g_dev_strategy,
+        /* name */      "g_dev",
+        /* maj */       CDEV_MAJOR,
+        /* dump */      nodump,
+        /* psize */     g_dev_psize,
+        /* flags */     D_DISK | D_CANFREE | D_TRACKCLOSE,
+};
+
+static g_taste_t g_dev_taste;
+static g_orphan_t g_dev_orphan;
+
+static struct g_method g_dev_method	= {
+	"DEV-method",
+	g_dev_taste,
+	NULL,
+	g_dev_orphan,
+	NULL,
+	G_METHOD_INITSTUFF
+};
+
+static void
+g_dev_clone(void *arg, char *name, int namelen, dev_t *dev)
+{
+	struct g_geom *gp;
+
+	if (*dev != NODEV)
+		return;
+
+	g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name);
+	g_rattle();
+
+	/* XXX: can I drop Giant here ??? */
+	/* g_topology_lock(); */
+	LIST_FOREACH(gp, &g_dev_method.geom, geom) {
+		if (strcmp(gp->name, name))
+			continue;
+		*dev = gp->softc;
+		g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev);
+		return;
+	}
+	/* g_topology_unlock(); */
+	return;
+}
+
+static void
+g_dev_register_cloner(void *foo __unused)
+{
+	static int once;
+
+	if (!once) {
+		if (!once)
+			EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000);
+		once++;
+	}
+}
+
+SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL);
+
+static struct g_geom *
+g_dev_taste(struct g_method *mp, struct g_provider *pp, struct thread *tp __unused, int insist __unused)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	static int unit;
+#if 1
+	u_int secsize;
+	off_t mediasize;
+	int error, j;
+#endif
+	dev_t dev;
+
+	g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
+	g_topology_assert();
+	LIST_FOREACH(cp, &pp->consumers, consumers)
+		if (cp->geom->method == mp)
+			return (NULL);
+	gp = g_new_geomf(mp, pp->name);
+	cp = g_new_consumer(gp);
+	g_attach(cp, pp);
+#if 1
+	error = g_access_rel(cp, 1, 0, 0);
+	g_topology_unlock();
+	if (!error) {
+		j = sizeof secsize;
+		error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize, tp);
+		if (error) {
+			secsize = 512;
+			printf("g_bsd_taste: error %d Sectors are %d bytes\n",
+			    error, secsize);
+		}
+		j = sizeof mediasize;
+		error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize, tp);
+		if (error) {
+			mediasize = 0;
+			printf("g_error %d Mediasize is %lld bytes\n",
+			    error, mediasize);
+		}
+		g_topology_lock();
+		g_access_rel(cp, -1, 0, 0);
+		g_topology_unlock();
+	} else {
+		secsize = 512;
+		mediasize = 0;
+	}
+#else
+	g_topology_unlock();
+#endif
+	mtx_lock(&Giant);
+#if 1
+	if (mediasize != 0)
+		printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n",
+		    pp->name, mediasize, mediasize / secsize, secsize);
+	else
+		printf("GEOM: \"%s\" (size unavailable)\n", pp->name);
+#endif
+	dev = make_dev(&g_dev_cdevsw, unit++,
+	    UID_ROOT, GID_WHEEL, 0600, gp->name);
+	gp->softc = dev;
+	dev->si_drv1 = gp;
+	dev->si_drv2 = cp;
+	mtx_unlock(&Giant);
+	g_topology_lock();
+	return (gp);
+}
+
+static int
+g_dev_open(dev_t dev, int flags, int fmt, struct thread *td)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	int error, r, w, e;
+
+	gp = dev->si_drv1;
+	cp = dev->si_drv2;
+	if (gp == NULL || cp == NULL)
+		return(ENXIO);
+	g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
+	    gp->name, flags, fmt, td);
+	mtx_unlock(&Giant);
+	g_topology_lock();
+	g_silence();
+	r = flags & FREAD ? 1 : 0;
+	w = flags & FWRITE ? 1 : 0;
+	e = flags & O_EXCL ? 1 : 0;
+	error = g_access_rel(cp, r, w, e);
+	g_topology_unlock();
+	mtx_lock(&Giant);
+	g_rattle();
+	return(error);
+}
+
+static int
+g_dev_close(dev_t dev, int flags, int fmt, struct thread *td)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	int error, r, w, e;
+
+	gp = dev->si_drv1;
+	cp = dev->si_drv2;
+	if (gp == NULL || cp == NULL)
+		return(ENXIO);
+	g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
+	    gp->name, flags, fmt, td);
+	mtx_unlock(&Giant);
+	g_topology_lock();
+	g_silence();
+	r = flags & FREAD ? -1 : 0;
+	w = flags & FWRITE ? -1 : 0;
+	e = flags & O_EXCL ? -1 : 0;
+	error = g_access_rel(cp, r, w, e);
+	g_topology_unlock();
+	mtx_lock(&Giant);
+	g_rattle();
+	return (error);
+}
+
+static int
+g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	char *nm;
+	int i, error;
+
+	gp = dev->si_drv1;
+	cp = dev->si_drv2;
+
+	error = 0;
+	mtx_unlock(&Giant);
+	switch (cmd) {
+	case DIOCGDINFO:	nm = "IOCTL::DIOCGDINFO";	break;
+	case DIOCGDVIRGIN:	nm = "IOCTL::DIOCGDVIRGIN";	break;
+	case DIOCGPART:		nm = "IOCTL::DIOCGPART";	break;
+	default:		nm = "?";			break;
+	}
+	i = IOCGROUP(cmd);
+	if (*nm == '?') {
+		printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name);
+		if (i > ' ' && i <= '~')
+			printf(" '%c'", (int)IOCGROUP(cmd));
+		else
+			printf(" 0x%lx", IOCGROUP(cmd));
+		printf("/%ld ", cmd & 0xff);
+		if (cmd & IOC_IN)
+			printf("I");
+		if (cmd & IOC_OUT)
+			printf("O");
+		printf("(%ld)", IOCPARM_LEN(cmd));
+		printf(" \"%s\"\n", nm);
+		error = ENOIOCTL;
+	}
+	if (error == 0) {
+		i = IOCPARM_LEN(cmd);
+		error = g_io_getattr(nm, cp, &i, data, td);
+		if (error != 0 && cmd == DIOCGDVIRGIN) {
+			g_topology_lock();
+			gp = g_create_geomf("BSD-method", cp->provider, NULL);
+			g_topology_unlock();
+		}
+	}
+	mtx_lock(&Giant);
+	g_rattle();
+	if (error == ENOIOCTL)
+		error = ENOTTY;
+	return (error);
+}
+
+static int
+g_dev_psize(dev_t dev)
+{
+	struct g_consumer *cp;
+	int i, error;
+	off_t mediasize;
+
+	cp = dev->si_drv2;
+
+	i = sizeof mediasize;
+	error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize, NULL);
+	if (error)
+		return (-1);
+	return (mediasize >> DEV_BSHIFT);
+}
+
+static void
+g_dev_done(struct bio *bp2)
+{
+	struct bio *bp;
+
+	bp = bp2->bio_linkage;
+	bp->bio_error = bp2->bio_error;
+	if (bp->bio_error != 0) {
+		g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
+		    bp2, bp->bio_error);
+		bp->bio_flags |= BIO_ERROR;
+	} else {
+		g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld",
+		    bp2, bp, bp->bio_resid, bp2->bio_completed);
+	}
+	bp->bio_resid = bp->bio_bcount - bp2->bio_completed;
+	g_destroy_bio(bp2);
+	mtx_lock(&Giant);
+	biodone(bp);
+	mtx_unlock(&Giant);
+}
+
+static void
+g_dev_strategy(struct bio *bp)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	struct bio *bp2;
+	dev_t dev;
+
+	mtx_unlock(&Giant);
+	dev = bp->bio_dev;
+	gp = dev->si_drv1;
+	cp = dev->si_drv2;
+	bp2 = g_clone_bio(bp);
+	bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT;
+	bp2->bio_length = (off_t)bp->bio_bcount;
+	bp2->bio_done = g_dev_done;
+	g_trace(G_T_BIO,
+	    "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d",
+	    bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data,
+	    bp2->bio_cmd);
+	g_io_request(bp2, cp);
+	mtx_lock(&Giant);
+}
+
+
+static void
+g_dev_orphan(struct g_consumer *cp, struct thread *tp)
+{
+	struct g_geom *gp;
+	dev_t dev;
+
+	gp = cp->geom;
+	g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name);
+	g_topology_assert();
+	if (cp->biocount > 0)
+		return;
+	dev = gp->softc;
+	destroy_dev(dev);
+	if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
+		g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace);
+	g_dettach(cp);
+	g_destroy_consumer(cp);
+	g_destroy_geom(gp);
+}
+
+DECLARE_GEOM_METHOD(g_dev_method, g_dev)
+