add support to freebsd

Unix/ventoy_unix_src/FreeBSD/geom_ventoy_src/12.x/sys/geom/ventoy/g_ventoy.c

+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2020 longpanda <admin@ventoy.net>
+ * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
+ */
+
+
+/* 
+ * This file is just copied from g_concat.h and replace strings
+ * "concat" ==> "ventoy"
+ * "CONCAT" ==> "VENTOY"
+ */
+
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/bio.h>
+#include <sys/sbuf.h>
+#include <sys/sysctl.h>
+#include <sys/malloc.h>
+#include <geom/geom.h>
+#include <geom/ventoy/g_ventoy.h>
+
+FEATURE(geom_ventoy, "GEOM ventoy support");
+
+static MALLOC_DEFINE(M_VENTOY, "ventoy_data", "GEOM_VENTOY Data");
+
+SYSCTL_DECL(_kern_geom);
+static SYSCTL_NODE(_kern_geom, OID_AUTO, ventoy, CTLFLAG_RW, 0,
+    "GEOM_VENTOY stuff");
+static u_int g_ventoy_debug = 0;
+SYSCTL_UINT(_kern_geom_ventoy, OID_AUTO, debug, CTLFLAG_RWTUN, &g_ventoy_debug, 0,
+    "Debug level");
+
+extern int resource_string_value(const char *name, int unit, const char *resname, const char **result);
+extern int resource_int_value(const char *name, int unit, const char *resname, int *result);
+
+static int g_ventoy_destroy(struct g_ventoy_softc *sc, boolean_t force);
+static int g_ventoy_destroy_geom(struct gctl_req *req, struct g_class *mp,
+    struct g_geom *gp);
+
+static g_taste_t g_ventoy_taste;
+static g_ctl_req_t g_ventoy_config;
+static g_dumpconf_t g_ventoy_dumpconf;
+
+static const char *g_ventoy_disk_uuid = NULL;
+static bool g_ventoy_tasted = false;
+static off_t g_ventoy_disk_size = 0;
+static off_t g_disk_map_start = 0;
+static off_t g_disk_map_end = 0;
+
+struct g_class g_ventoy_class = {
+	.name = G_VENTOY_CLASS_NAME,
+	.version = G_VERSION,
+	.ctlreq = g_ventoy_config,
+	.taste = g_ventoy_taste,
+	.destroy_geom = g_ventoy_destroy_geom
+};
+
+
+/*
+ * Greatest Common Divisor.
+ */
+static u_int
+gcd(u_int a, u_int b)
+{
+	u_int c;
+
+	while (b != 0) {
+		c = a;
+		a = b;
+		b = (c % b);
+	}
+	return (a);
+}
+
+/*
+ * Least Common Multiple.
+ */
+static u_int
+lcm(u_int a, u_int b)
+{
+
+	return ((a * b) / gcd(a, b));
+}
+
+/*
+ * Return the number of valid disks.
+ */
+static u_int
+g_ventoy_nvalid(struct g_ventoy_softc *sc)
+{
+	u_int i, no;
+
+	no = 0;
+	for (i = 0; i < sc->sc_ndisks; i++) {
+		if (sc->sc_disks[i].d_consumer != NULL)
+			no++;
+	}
+
+	return (no);
+}
+
+static void
+g_ventoy_remove_disk(struct g_ventoy_disk *disk)
+{
+	struct g_consumer *cp;
+	struct g_ventoy_softc *sc;
+
+	g_topology_assert();
+	KASSERT(disk->d_consumer != NULL, ("Non-valid disk in %s.", __func__));
+	sc = disk->d_softc;
+	cp = disk->d_consumer;
+
+	if (!disk->d_removed) {
+		G_VENTOY_DEBUG(0, "Disk %s removed from %s.",
+		    cp->provider->name, sc->sc_name);
+		disk->d_removed = 1;
+	}
+
+	if (sc->sc_provider != NULL) {
+		G_VENTOY_DEBUG(0, "Device %s deactivated.",
+		    sc->sc_provider->name);
+		g_wither_provider(sc->sc_provider, ENXIO);
+		sc->sc_provider = NULL;
+	}
+
+	if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
+		return;
+	disk->d_consumer = NULL;
+	g_detach(cp);
+	g_destroy_consumer(cp);
+	/* If there are no valid disks anymore, remove device. */
+	if (LIST_EMPTY(&sc->sc_geom->consumer))
+		g_ventoy_destroy(sc, 1);
+}
+
+static void
+g_ventoy_orphan(struct g_consumer *cp)
+{
+	struct g_ventoy_softc *sc;
+	struct g_ventoy_disk *disk;
+	struct g_geom *gp;
+
+	g_topology_assert();
+	gp = cp->geom;
+	sc = gp->softc;
+	if (sc == NULL)
+		return;
+
+	disk = cp->private;
+	if (disk == NULL)	/* Possible? */
+		return;
+	g_ventoy_remove_disk(disk);
+}
+
+static int
+g_ventoy_access(struct g_provider *pp, int dr, int dw, int de)
+{
+	struct g_consumer *cp1, *cp2, *tmp;
+	struct g_ventoy_disk *disk;
+	struct g_geom *gp;
+	int error;
+
+    if (dw > 0) /* readonly */
+		return (EPERM);
+
+	g_topology_assert();
+	gp = pp->geom;
+
+	/* On first open, grab an extra "exclusive" bit */
+	if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
+		de++;
+	/* ... and let go of it on last close */
+	if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
+		de--;
+
+	LIST_FOREACH_SAFE(cp1, &gp->consumer, consumer, tmp) {
+		error = g_access(cp1, dr, dw, de);
+		if (error != 0)
+			goto fail;
+		disk = cp1->private;
+		if (cp1->acr == 0 && cp1->acw == 0 && cp1->ace == 0 &&
+		    disk->d_removed) {
+			g_ventoy_remove_disk(disk); /* May destroy geom. */
+		}
+	}
+	return (0);
+
+fail:
+	LIST_FOREACH(cp2, &gp->consumer, consumer) {
+		if (cp1 == cp2)
+			break;
+		g_access(cp2, -dr, -dw, -de);
+	}
+	return (error);
+}
+
+static void
+g_ventoy_kernel_dump(struct bio *bp)
+{
+	struct g_ventoy_softc *sc;
+	struct g_ventoy_disk *disk;
+	struct bio *cbp;
+	struct g_kerneldump *gkd;
+	u_int i;
+
+	sc = bp->bio_to->geom->softc;
+	gkd = (struct g_kerneldump *)bp->bio_data;
+	for (i = 0; i < sc->sc_ndisks; i++) {
+		if (sc->sc_disks[i].d_start <= gkd->offset &&
+		    sc->sc_disks[i].d_end > gkd->offset)
+			break;
+	}
+	if (i == sc->sc_ndisks)
+		g_io_deliver(bp, EOPNOTSUPP);
+	disk = &sc->sc_disks[i];
+	gkd->offset -= disk->d_start;
+	if (gkd->length > disk->d_end - disk->d_start - gkd->offset)
+		gkd->length = disk->d_end - disk->d_start - gkd->offset;
+	cbp = g_clone_bio(bp);
+	if (cbp == NULL) {
+		g_io_deliver(bp, ENOMEM);
+		return;
+	}
+	cbp->bio_done = g_std_done;
+	g_io_request(cbp, disk->d_consumer);
+	G_VENTOY_DEBUG(1, "Kernel dump will go to %s.",
+	    disk->d_consumer->provider->name);
+}
+
+static void
+g_ventoy_done(struct bio *bp)
+{
+	struct g_ventoy_softc *sc;
+	struct bio *pbp;
+
+	pbp = bp->bio_parent;
+	sc = pbp->bio_to->geom->softc;
+	mtx_lock(&sc->sc_lock);
+	if (pbp->bio_error == 0)
+		pbp->bio_error = bp->bio_error;
+	pbp->bio_completed += bp->bio_completed;
+	pbp->bio_inbed++;
+	if (pbp->bio_children == pbp->bio_inbed) {
+		mtx_unlock(&sc->sc_lock);
+		g_io_deliver(pbp, pbp->bio_error);
+	} else
+		mtx_unlock(&sc->sc_lock);
+	g_destroy_bio(bp);
+}
+
+static void
+g_ventoy_flush(struct g_ventoy_softc *sc, struct bio *bp)
+{
+	struct bio_queue_head queue;
+	struct g_consumer *cp;
+	struct bio *cbp;
+	u_int no;
+
+	bioq_init(&queue);
+	for (no = 0; no < sc->sc_ndisks; no++) {
+		cbp = g_clone_bio(bp);
+		if (cbp == NULL) {
+			while ((cbp = bioq_takefirst(&queue)) != NULL)
+				g_destroy_bio(cbp);
+			if (bp->bio_error == 0)
+				bp->bio_error = ENOMEM;
+			g_io_deliver(bp, bp->bio_error);
+			return;
+		}
+		bioq_insert_tail(&queue, cbp);
+		cbp->bio_done = g_ventoy_done;
+		cbp->bio_caller1 = sc->sc_disks[no].d_consumer;
+		cbp->bio_to = sc->sc_disks[no].d_consumer->provider;
+	}
+	while ((cbp = bioq_takefirst(&queue)) != NULL) {
+		G_VENTOY_LOGREQ(cbp, "Sending request.");
+		cp = cbp->bio_caller1;
+		cbp->bio_caller1 = NULL;
+		g_io_request(cbp, cp);
+	}
+}
+
+static void
+g_ventoy_start(struct bio *bp)
+{
+	struct bio_queue_head queue;
+	struct g_ventoy_softc *sc;
+	struct g_ventoy_disk *disk;
+	struct g_provider *pp;
+	off_t offset, end, length, off, len;
+	struct bio *cbp;
+	char *addr;
+	u_int no;
+
+	pp = bp->bio_to;
+	sc = pp->geom->softc;
+	/*
+	 * If sc == NULL, provider's error should be set and g_ventoy_start()
+	 * should not be called at all.
+	 */
+	KASSERT(sc != NULL,
+	    ("Provider's error should be set (error=%d)(device=%s).",
+	    bp->bio_to->error, bp->bio_to->name));
+
+	G_VENTOY_LOGREQ(bp, "Request received.");
+
+	switch (bp->bio_cmd) {
+	case BIO_READ:
+	case BIO_WRITE:
+	case BIO_DELETE:
+		break;
+	case BIO_FLUSH:
+		g_ventoy_flush(sc, bp);
+		return;
+	case BIO_GETATTR:
+		if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
+			g_ventoy_kernel_dump(bp);
+			return;
+		}
+		/* To which provider it should be delivered? */
+		/* FALLTHROUGH */
+	default:
+		g_io_deliver(bp, EOPNOTSUPP);
+		return;
+	}
+
+	offset = bp->bio_offset;
+	length = bp->bio_length;
+	if ((bp->bio_flags & BIO_UNMAPPED) != 0)
+		addr = NULL;
+	else
+		addr = bp->bio_data;
+	end = offset + length;
+
+	bioq_init(&queue);
+	for (no = 0; no < sc->sc_ndisks; no++) {
+		disk = &sc->sc_disks[no];
+		if (disk->d_end <= offset)
+			continue;
+		if (disk->d_start >= end)
+			break;
+
+		off = offset - disk->d_start;
+		len = MIN(length, disk->d_end - offset);
+		length -= len;
+		offset += len;
+
+		cbp = g_clone_bio(bp);
+		if (cbp == NULL) {
+			while ((cbp = bioq_takefirst(&queue)) != NULL)
+				g_destroy_bio(cbp);
+			if (bp->bio_error == 0)
+				bp->bio_error = ENOMEM;
+			g_io_deliver(bp, bp->bio_error);
+			return;
+		}
+		bioq_insert_tail(&queue, cbp);
+		/*
+		 * Fill in the component buf structure.
+		 */
+		if (len == bp->bio_length)
+			cbp->bio_done = g_std_done;
+		else
+			cbp->bio_done = g_ventoy_done;
+		cbp->bio_offset = off + disk->d_map_start;
+		cbp->bio_length = len;
+		if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
+			cbp->bio_ma_offset += (uintptr_t)addr;
+			cbp->bio_ma += cbp->bio_ma_offset / PAGE_SIZE;
+			cbp->bio_ma_offset %= PAGE_SIZE;
+			cbp->bio_ma_n = round_page(cbp->bio_ma_offset +
+			    cbp->bio_length) / PAGE_SIZE;
+		} else
+			cbp->bio_data = addr;
+		addr += len;
+		cbp->bio_to = disk->d_consumer->provider;
+		cbp->bio_caller1 = disk;
+
+		if (length == 0)
+			break;
+	}
+	KASSERT(length == 0,
+	    ("Length is still greater than 0 (class=%s, name=%s).",
+	    bp->bio_to->geom->class->name, bp->bio_to->geom->name));
+	while ((cbp = bioq_takefirst(&queue)) != NULL) {
+		G_VENTOY_LOGREQ(cbp, "Sending request.");
+		disk = cbp->bio_caller1;
+		cbp->bio_caller1 = NULL;
+		g_io_request(cbp, disk->d_consumer);
+	}
+}
+
+static void
+g_ventoy_check_and_run(struct g_ventoy_softc *sc)
+{
+	struct g_ventoy_disk *disk;
+	struct g_provider *dp, *pp;
+	u_int no, sectorsize = 0;
+	off_t start;
+
+	g_topology_assert();
+	if (g_ventoy_nvalid(sc) != sc->sc_ndisks)
+		return;
+
+	pp = g_new_providerf(sc->sc_geom, "ventoy/%s", sc->sc_name);
+	pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE |
+	    G_PF_ACCEPT_UNMAPPED;
+	start = 0;
+	for (no = 0; no < sc->sc_ndisks; no++) {
+		disk = &sc->sc_disks[no];
+		dp = disk->d_consumer->provider;
+		disk->d_start = start;
+		disk->d_end = disk->d_start + (disk->d_map_end - disk->d_map_start);
+		if (sc->sc_type == G_VENTOY_TYPE_AUTOMATIC)
+			disk->d_end -= dp->sectorsize;
+		start = disk->d_end;
+		if (no == 0)
+			sectorsize = dp->sectorsize;
+		else
+			sectorsize = lcm(sectorsize, dp->sectorsize);
+
+		/* A provider underneath us doesn't support unmapped */
+		if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
+			G_VENTOY_DEBUG(1, "Cancelling unmapped "
+			    "because of %s.", dp->name);
+			pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
+		}
+	}
+	pp->sectorsize = sectorsize;
+	/* We have sc->sc_disks[sc->sc_ndisks - 1].d_end in 'start'. */
+	pp->mediasize = start;
+	pp->stripesize = sc->sc_disks[0].d_consumer->provider->stripesize;
+	pp->stripeoffset = sc->sc_disks[0].d_consumer->provider->stripeoffset;
+	sc->sc_provider = pp;
+	g_error_provider(pp, 0);
+
+	G_VENTOY_DEBUG(0, "Device %s activated.", sc->sc_provider->name);
+}
+
+static int
+g_ventoy_read_metadata(struct g_consumer *cp, struct g_ventoy_metadata *md)
+{
+	struct g_provider *pp;
+	u_char *buf;
+	int error;
+
+	g_topology_assert();
+
+	error = g_access(cp, 1, 0, 0);
+	if (error != 0)
+		return (error);
+	pp = cp->provider;
+	g_topology_unlock();
+	buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
+	    &error);
+	g_topology_lock();
+	g_access(cp, -1, 0, 0);
+	if (buf == NULL)
+		return (error);
+
+	/* Decode metadata. */
+	ventoy_metadata_decode(buf, md);
+	g_free(buf);
+
+	return (0);
+}
+
+/*
+ * Add disk to given device.
+ */
+static int
+g_ventoy_add_disk(struct g_ventoy_softc *sc, struct g_provider *pp, u_int no)
+{
+	struct g_ventoy_disk *disk;
+	struct g_consumer *cp, *fcp;
+	struct g_geom *gp;
+	int error;
+
+	g_topology_assert();
+	/* Metadata corrupted? */
+	if (no >= sc->sc_ndisks)
+		return (EINVAL);
+
+	disk = &sc->sc_disks[no];
+	/* Check if disk is not already attached. */
+	if (disk->d_consumer != NULL)
+		return (EEXIST);
+
+	gp = sc->sc_geom;
+	fcp = LIST_FIRST(&gp->consumer);
+
+	cp = g_new_consumer(gp);
+	cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
+	error = g_attach(cp, pp);
+	if (error != 0) {
+		g_destroy_consumer(cp);
+		return (error);
+	}
+
+	if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
+		error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
+		if (error != 0) {
+			g_detach(cp);
+			g_destroy_consumer(cp);
+			return (error);
+		}
+	}
+	if (sc->sc_type == G_VENTOY_TYPE_AUTOMATIC) {
+		struct g_ventoy_metadata md;
+
+		/* Re-read metadata. */
+		error = g_ventoy_read_metadata(cp, &md);
+		if (error != 0)
+			goto fail;
+
+		if (strcmp(md.md_magic, G_VENTOY_MAGIC) != 0 ||
+		    strcmp(md.md_name, sc->sc_name) != 0 ||
+		    md.md_id != sc->sc_id) {
+			G_VENTOY_DEBUG(0, "Metadata on %s changed.", pp->name);
+			goto fail;
+		}
+	}
+
+	cp->private = disk;
+	disk->d_consumer = cp;
+	disk->d_softc = sc;
+	disk->d_start = 0;	/* not yet */
+	disk->d_end = 0;	/* not yet */
+	disk->d_removed = 0;
+    
+	disk->d_map_start = g_disk_map_start;
+	disk->d_map_end = g_disk_map_end;
+
+	G_VENTOY_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
+
+	g_ventoy_check_and_run(sc);
+
+	return (0);
+fail:
+	if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
+		g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
+	g_detach(cp);
+	g_destroy_consumer(cp);
+	return (error);
+}
+
+static struct g_geom *
+g_ventoy_create(struct g_class *mp, const struct g_ventoy_metadata *md,
+    u_int type)
+{
+	struct g_ventoy_softc *sc;
+	struct g_geom *gp;
+	u_int no;
+
+	G_VENTOY_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
+	    md->md_id);
+
+	/* One disks is minimum. */
+	if (md->md_all < 1)
+		return (NULL);
+
+	/* Check for duplicate unit */
+	LIST_FOREACH(gp, &mp->geom, geom) {
+		sc = gp->softc;
+		if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
+			G_VENTOY_DEBUG(0, "Device %s already configured.",
+			    gp->name);
+			return (NULL);
+		}
+	}
+	gp = g_new_geomf(mp, "%s", md->md_name);
+	sc = malloc(sizeof(*sc), M_VENTOY, M_WAITOK | M_ZERO);
+	gp->start = g_ventoy_start;
+	gp->spoiled = g_ventoy_orphan;
+	gp->orphan = g_ventoy_orphan;
+	gp->access = g_ventoy_access;
+	gp->dumpconf = g_ventoy_dumpconf;
+
+	sc->sc_id = md->md_id;
+	sc->sc_ndisks = md->md_all;
+	sc->sc_disks = malloc(sizeof(struct g_ventoy_disk) * sc->sc_ndisks,
+	    M_VENTOY, M_WAITOK | M_ZERO);
+	for (no = 0; no < sc->sc_ndisks; no++)
+		sc->sc_disks[no].d_consumer = NULL;
+	sc->sc_type = type;
+	mtx_init(&sc->sc_lock, "gventoy lock", NULL, MTX_DEF);
+
+	gp->softc = sc;
+	sc->sc_geom = gp;
+	sc->sc_provider = NULL;
+
+	G_VENTOY_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
+
+	return (gp);
+}
+
+static int
+g_ventoy_destroy(struct g_ventoy_softc *sc, boolean_t force)
+{
+	struct g_provider *pp;
+	struct g_consumer *cp, *cp1;
+	struct g_geom *gp;
+
+	g_topology_assert();
+
+	if (sc == NULL)
+		return (ENXIO);
+
+	pp = sc->sc_provider;
+	if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
+		if (force) {
+			G_VENTOY_DEBUG(0, "Device %s is still open, so it "
+			    "can't be definitely removed.", pp->name);
+		} else {
+			G_VENTOY_DEBUG(1,
+			    "Device %s is still open (r%dw%de%d).", pp->name,
+			    pp->acr, pp->acw, pp->ace);
+			return (EBUSY);
+		}
+	}
+
+	gp = sc->sc_geom;
+	LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) {
+		g_ventoy_remove_disk(cp->private);
+		if (cp1 == NULL)
+			return (0);	/* Recursion happened. */
+	}
+	if (!LIST_EMPTY(&gp->consumer))
+		return (EINPROGRESS);
+
+	gp->softc = NULL;
+	KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
+	    gp->name));
+	free(sc->sc_disks, M_VENTOY);
+	mtx_destroy(&sc->sc_lock);
+	free(sc, M_VENTOY);
+
+	G_VENTOY_DEBUG(0, "Device %s destroyed.", gp->name);
+	g_wither_geom(gp, ENXIO);
+	return (0);
+}
+
+static int
+g_ventoy_destroy_geom(struct gctl_req *req __unused,
+    struct g_class *mp __unused, struct g_geom *gp)
+{
+	struct g_ventoy_softc *sc;
+
+	sc = gp->softc;
+	return (g_ventoy_destroy(sc, 0));
+}
+
+static bool g_vtoy_check_disk(struct g_class *mp, struct g_provider *pp)
+{
+    int i;
+    uint8_t *buf;
+    char uuid[64];
+    const char *value;
+    struct g_consumer *cp;
+	struct g_geom *gp;
+    
+    if (g_ventoy_disk_size == 0)
+    {
+        if (resource_string_value("ventoy", 0, "disksize", &value) == 0)
+        {
+            G_DEBUG("ventoy.disksize: %s\n", value);
+            g_ventoy_disk_size = strtouq(value, NULL, 0);
+        }
+
+        if (resource_string_value("ventoy", 0, "diskuuid", &g_ventoy_disk_uuid) == 0)
+        {
+            G_DEBUG("ventoy.diskuuid: <%s>\n", g_ventoy_disk_uuid);
+        }
+    }
+
+    if (g_ventoy_disk_size != pp->mediasize)
+    {
+        return false;
+    }
+
+    if (strncmp(pp->name, "cd", 2) == 0 || strchr(pp->name, '/'))
+    {
+        return false;
+    }
+
+    /* read UUID from disk */
+    gp = g_new_geomf(mp, "ventoy:taste");
+	gp->start = NULL;
+	gp->access = g_ventoy_access;
+	gp->orphan = g_ventoy_orphan;
+	cp = g_new_consumer(gp);
+	g_attach(cp, pp);
+
+    g_access(cp, 1, 0, 0);
+	g_topology_unlock();
+	buf = g_read_data(cp, 0, pp->sectorsize, NULL); 
+	g_topology_lock();
+	g_access(cp, -1, 0, 0);
+    
+    g_detach(cp);
+	g_destroy_consumer(cp);
+	g_destroy_geom(gp);
+	gp = NULL;
+
+    if (!buf)
+    {
+        return false;
+    }
+
+    for (i = 0; i < 16; i++)
+    {
+        sprintf(uuid + i * 2, "%02x", buf[0x180 + i]);
+    }
+    g_free(buf);
+    
+    if (strncmp(g_ventoy_disk_uuid, uuid, 32) == 0)
+    {
+        return true;
+    }
+
+    return false;
+}
+
+static struct g_geom *
+g_ventoy_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
+{
+    int i;
+	int error;
+    int disknum;
+    char *endpos;
+    const char *value;
+	struct g_geom *gp;
+	struct g_ventoy_metadata md;
+	struct g_ventoy_softc *sc;
+
+    if (g_ventoy_tasted)
+    {
+        return NULL;
+    }
+
+	G_DEBUG("%s(%s, %s)\n", __func__, mp->name, pp->name);
+	g_topology_assert();
+
+	/* Skip providers that are already open for writing. */
+	if (pp->acw > 0)
+		return (NULL);
+
+    if (!g_vtoy_check_disk(mp, pp))
+    {
+        return NULL;
+    }
+
+    if (strcmp(pp->name, "ada1"))
+    {
+        return NULL;
+    }
+
+    g_ventoy_tasted = true;
+
+    G_DEBUG("######### ventoy disk <%s> #############\n", pp->name);
+
+    resource_int_value("ventoy", 0, "segnum", &disknum);
+
+    strlcpy(md.md_magic, G_VENTOY_MAGIC, sizeof(md.md_magic));
+	md.md_version = G_VENTOY_VERSION;
+	strlcpy(md.md_name, "IMAGE", sizeof(md.md_name));
+	md.md_id = arc4random();
+	md.md_no = 0;
+	md.md_all = (uint16_t)disknum;
+	bzero(md.md_provider, sizeof(md.md_provider));
+	/* This field is not important here. */
+	md.md_provsize = 0;
+
+	gp = g_ventoy_create(mp, &md, G_VENTOY_TYPE_MANUAL);
+	if (gp == NULL) {
+		G_VENTOY_DEBUG(0, "Cannot create device %s.",
+		    md.md_name);
+		return (NULL);
+	}
+	sc = gp->softc;
+
+    for (i = 0; i < disknum; i ++)
+    {
+        if (resource_string_value("ventoy", i, "seg", &value) == 0)
+        {
+            g_disk_map_start = strtouq(value, &endpos, 0);
+            g_disk_map_end = strtouq(endpos + 1, NULL, 0);
+        }
+        else
+        {
+            printf("Failed to parse ventoy seg %d\n", i);
+            continue;
+        }
+
+        G_DEBUG("ventoy segment%d: %s\n", i, value);
+        
+        G_VENTOY_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
+    	error = g_ventoy_add_disk(sc, pp, i);
+    	if (error != 0) {
+    		G_VENTOY_DEBUG(0,
+    		    "Cannot add disk %s to %s (error=%d).", pp->name,
+    		    gp->name, error);
+    		g_ventoy_destroy(sc, 1);
+    		return (NULL);
+    	}
+        
+        g_disk_map_start = 0;
+        g_disk_map_end = 0;
+    }
+
+	return (gp);
+}
+
+static void
+g_ventoy_ctl_create(struct gctl_req *req, struct g_class *mp)
+{
+	u_int attached, no;
+	struct g_ventoy_metadata md;
+	struct g_provider *pp;
+	struct g_ventoy_softc *sc;
+	struct g_geom *gp;
+	struct sbuf *sb;
+	const char *name;
+	char param[16];
+	int *nargs;
+
+	g_topology_assert();
+	nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
+	if (nargs == NULL) {
+		gctl_error(req, "No '%s' argument.", "nargs");
+		return;
+	}
+	if (*nargs < 2) {
+		gctl_error(req, "Too few arguments.");
+		return;
+	}
+
+	strlcpy(md.md_magic, G_VENTOY_MAGIC, sizeof(md.md_magic));
+	md.md_version = G_VENTOY_VERSION;
+	name = gctl_get_asciiparam(req, "arg0");
+	if (name == NULL) {
+		gctl_error(req, "No 'arg%u' argument.", 0);
+		return;
+	}
+	strlcpy(md.md_name, name, sizeof(md.md_name));
+	md.md_id = arc4random();
+	md.md_no = 0;
+	md.md_all = *nargs - 1;
+	bzero(md.md_provider, sizeof(md.md_provider));
+	/* This field is not important here. */
+	md.md_provsize = 0;
+
+	/* Check all providers are valid */
+	for (no = 1; no < *nargs; no++) {
+		snprintf(param, sizeof(param), "arg%u", no);
+		name = gctl_get_asciiparam(req, param);
+		if (name == NULL) {
+			gctl_error(req, "No 'arg%u' argument.", no);
+			return;
+		}
+		if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
+			name += strlen("/dev/");
+		pp = g_provider_by_name(name);
+		if (pp == NULL) {
+			G_VENTOY_DEBUG(1, "Disk %s is invalid.", name);
+			gctl_error(req, "Disk %s is invalid.", name);
+			return;
+		}
+	}
+
+	gp = g_ventoy_create(mp, &md, G_VENTOY_TYPE_MANUAL);
+	if (gp == NULL) {
+		gctl_error(req, "Can't configure %s.", md.md_name);
+		return;
+	}
+
+	sc = gp->softc;
+	sb = sbuf_new_auto();
+	sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
+	for (attached = 0, no = 1; no < *nargs; no++) {
+		snprintf(param, sizeof(param), "arg%u", no);
+		name = gctl_get_asciiparam(req, param);
+		if (name == NULL) {
+			gctl_error(req, "No 'arg%d' argument.", no);
+			return;
+		}
+		if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
+			name += strlen("/dev/");
+		pp = g_provider_by_name(name);
+		KASSERT(pp != NULL, ("Provider %s disappear?!", name));
+		if (g_ventoy_add_disk(sc, pp, no - 1) != 0) {
+			G_VENTOY_DEBUG(1, "Disk %u (%s) not attached to %s.",
+			    no, pp->name, gp->name);
+			sbuf_printf(sb, " %s", pp->name);
+			continue;
+		}
+		attached++;
+	}
+	sbuf_finish(sb);
+	if (md.md_all != attached) {
+		g_ventoy_destroy(gp->softc, 1);
+		gctl_error(req, "%s", sbuf_data(sb));
+	}
+	sbuf_delete(sb);
+}
+
+static struct g_ventoy_softc *
+g_ventoy_find_device(struct g_class *mp, const char *name)
+{
+	struct g_ventoy_softc *sc;
+	struct g_geom *gp;
+
+	LIST_FOREACH(gp, &mp->geom, geom) {
+		sc = gp->softc;
+		if (sc == NULL)
+			continue;
+		if (strcmp(sc->sc_name, name) == 0)
+			return (sc);
+	}
+	return (NULL);
+}
+
+static void
+g_ventoy_ctl_destroy(struct gctl_req *req, struct g_class *mp)
+{
+	struct g_ventoy_softc *sc;
+	int *force, *nargs, error;
+	const char *name;
+	char param[16];
+	u_int i;
+
+	g_topology_assert();
+
+	nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
+	if (nargs == NULL) {
+		gctl_error(req, "No '%s' argument.", "nargs");
+		return;
+	}
+	if (*nargs <= 0) {
+		gctl_error(req, "Missing device(s).");
+		return;
+	}
+	force = gctl_get_paraml(req, "force", sizeof(*force));
+	if (force == NULL) {
+		gctl_error(req, "No '%s' argument.", "force");
+		return;
+	}
+
+	for (i = 0; i < (u_int)*nargs; i++) {
+		snprintf(param, sizeof(param), "arg%u", i);
+		name = gctl_get_asciiparam(req, param);
+		if (name == NULL) {
+			gctl_error(req, "No 'arg%u' argument.", i);
+			return;
+		}
+		sc = g_ventoy_find_device(mp, name);
+		if (sc == NULL) {
+			gctl_error(req, "No such device: %s.", name);
+			return;
+		}
+		error = g_ventoy_destroy(sc, *force);
+		if (error != 0) {
+			gctl_error(req, "Cannot destroy device %s (error=%d).",
+			    sc->sc_name, error);
+			return;
+		}
+	}
+}
+
+static void
+g_ventoy_config(struct gctl_req *req, struct g_class *mp, const char *verb)
+{
+	uint32_t *version;
+
+    return;
+    
+	g_topology_assert();
+    
+	version = gctl_get_paraml(req, "version", sizeof(*version));
+	if (version == NULL) {
+		gctl_error(req, "No '%s' argument.", "version");
+		return;
+	}
+	if (*version != G_VENTOY_VERSION) {
+		gctl_error(req, "Userland and kernel parts are out of sync.");
+		return;
+	}
+
+	if (strcmp(verb, "create") == 0) {
+		g_ventoy_ctl_create(req, mp);
+		return;
+	} else if (strcmp(verb, "destroy") == 0 ||
+	    strcmp(verb, "stop") == 0) {
+		g_ventoy_ctl_destroy(req, mp);
+		return;
+	}
+	gctl_error(req, "Unknown verb.");
+}
+
+static void
+g_ventoy_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
+    struct g_consumer *cp, struct g_provider *pp)
+{
+	struct g_ventoy_softc *sc;
+
+	g_topology_assert();
+	sc = gp->softc;
+	if (sc == NULL)
+		return;
+	if (pp != NULL) {
+		/* Nothing here. */
+	} else if (cp != NULL) {
+		struct g_ventoy_disk *disk;
+
+		disk = cp->private;
+		if (disk == NULL)
+			return;
+		sbuf_printf(sb, "%s<End>%jd</End>\n", indent,
+		    (intmax_t)disk->d_end);
+		sbuf_printf(sb, "%s<Start>%jd</Start>\n", indent,
+		    (intmax_t)disk->d_start);
+	} else {
+		sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
+		sbuf_printf(sb, "%s<Type>", indent);
+		switch (sc->sc_type) {
+		case G_VENTOY_TYPE_AUTOMATIC:
+			sbuf_cat(sb, "AUTOMATIC");
+			break;
+		case G_VENTOY_TYPE_MANUAL:
+			sbuf_cat(sb, "MANUAL");
+			break;
+		default:
+			sbuf_cat(sb, "UNKNOWN");
+			break;
+		}
+		sbuf_cat(sb, "</Type>\n");
+		sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
+		    indent, sc->sc_ndisks, g_ventoy_nvalid(sc));
+		sbuf_printf(sb, "%s<State>", indent);
+		if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
+			sbuf_cat(sb, "UP");
+		else
+			sbuf_cat(sb, "DOWN");
+		sbuf_cat(sb, "</State>\n");
+	}
+}
+
+DECLARE_GEOM_CLASS(g_ventoy_class, g_ventoy);
+//MODULE_VERSION(geom_ventoy, 0);

Unix/ventoy_unix_src/FreeBSD/geom_ventoy_src/12.x/sys/geom/ventoy/g_ventoy.h

+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2020 longpanda <admin@ventoy.net>
+ * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
+ *
+ * $FreeBSD$
+ */
+
+/* 
+ * This file is just copied from g_concat.h and replace strings
+ * "concat" ==> "ventoy"
+ * "CONCAT" ==> "VENTOY"
+ */
+
+#ifndef	_G_VENTOY_H_
+#define	_G_VENTOY_H_
+
+#include <sys/endian.h>
+
+#define	G_VENTOY_CLASS_NAME	"VENTOY"
+
+#define	G_VENTOY_MAGIC		"GEOM::VENTOY"
+/*
+ * Version history:
+ * 1 - Initial version number.
+ * 2 - Added 'stop' command to gconcat(8).
+ * 3 - Added md_provider field to metadata and '-h' option to gconcat(8).
+ * 4 - Added md_provsize field to metadata.
+ */
+#define	G_VENTOY_VERSION	4
+
+#ifdef _KERNEL
+#define	G_VENTOY_TYPE_MANUAL	0
+#define	G_VENTOY_TYPE_AUTOMATIC	1
+
+#define G_DEBUG(...) if (bootverbose) printf(__VA_ARGS__)
+#define G_VENTOY_DEBUG(lvl, ...) if (g_ventoy_debug) printf(__VA_ARGS__)
+#define G_VENTOY_LOGREQ(bp, ...) if (g_ventoy_debug) printf(__VA_ARGS__)
+
+struct g_ventoy_disk {
+	struct g_consumer	*d_consumer;
+	struct g_ventoy_softc	*d_softc;
+	off_t			 d_start;
+	off_t			 d_end;
+    off_t			 d_map_start;
+    off_t			 d_map_end;
+	int			 d_candelete;
+	int			 d_removed;
+};
+
+struct g_ventoy_softc {
+	u_int		 sc_type;	/* provider type */
+	struct g_geom	*sc_geom;
+	struct g_provider *sc_provider;
+	uint32_t	 sc_id;		/* concat unique ID */
+
+	struct g_ventoy_disk *sc_disks;
+	uint16_t	 sc_ndisks;
+	struct mtx	 sc_lock;
+};
+#define	sc_name	sc_geom->name
+#endif	/* _KERNEL */
+
+struct g_ventoy_metadata {
+	char		md_magic[16];	/* Magic value. */
+	uint32_t	md_version;	/* Version number. */
+	char		md_name[16];	/* Concat name. */
+	uint32_t	md_id;		/* Unique ID. */
+	uint16_t	md_no;		/* Disk number. */
+	uint16_t	md_all;		/* Number of all disks. */
+	char		md_provider[16]; /* Hardcoded provider. */
+	uint64_t	md_provsize;	/* Provider's size. */
+};
+static __inline void
+ventoy_metadata_encode(const struct g_ventoy_metadata *md, u_char *data)
+{
+
+	bcopy(md->md_magic, data, sizeof(md->md_magic));
+	le32enc(data + 16, md->md_version);
+	bcopy(md->md_name, data + 20, sizeof(md->md_name));
+	le32enc(data + 36, md->md_id);
+	le16enc(data + 40, md->md_no);
+	le16enc(data + 42, md->md_all);
+	bcopy(md->md_provider, data + 44, sizeof(md->md_provider));
+	le64enc(data + 60, md->md_provsize);
+}
+static __inline void
+ventoy_metadata_decode(const u_char *data, struct g_ventoy_metadata *md)
+{
+
+	bcopy(data, md->md_magic, sizeof(md->md_magic));
+	md->md_version = le32dec(data + 16);
+	bcopy(data + 20, md->md_name, sizeof(md->md_name));
+	md->md_id = le32dec(data + 36);
+	md->md_no = le16dec(data + 40);
+	md->md_all = le16dec(data + 42);
+	bcopy(data + 44, md->md_provider, sizeof(md->md_provider));
+	md->md_provsize = le64dec(data + 60);
+}
+#endif	/* _G_VENTOY_H_ */

Unix/ventoy_unix_src/FreeBSD/geom_ventoy_src/12.x/sys/modules/geom/geom_ventoy/Makefile

+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/geom/ventoy
+
+KMOD=	geom_ventoy
+SRCS=	g_ventoy.c
+
+.include <bsd.kmod.mk>

Ventoy2Disk/Ventoy2Disk/Ventoy2Disk.c

@@ -167,8 +167,7 @@ static BOOL IsVentoyPhyDrive(int PhyDrive, UINT64 SizeBytes, MBR_HEAD *pMBR, UIN
 		PartStartSector = MBR.PartTbl[0].StartSectorId + MBR.PartTbl[0].SectorCount;
 		PartSectorCount = VENTOY_EFI_PART_SIZE / 512;
 
-		if (MBR.PartTbl[1].FsFlag != 0xEF ||
-			MBR.PartTbl[1].StartSectorId != PartStartSector ||
+		if (MBR.PartTbl[1].StartSectorId != PartStartSector ||
 			MBR.PartTbl[1].SectorCount != PartSectorCount)
 		{
 			Log("Part2 not match [0x%x 0x%x] [%u %u] [%u %u]",