Add a first version of a GEOMified vinum.

1 files changed, 569 insertions, 0 deletions

diff --git a/sys/geom/vinum/geom_vinum.c b/sys/geom/vinum/geom_vinum.c
new file mode 100644
index 0000000..44a8061
--- /dev/null
+++ b/sys/geom/vinum/geom_vinum.c
@@ -0,0 +1,569 @@
+/*
+ *  Copyright (c) 2004 Lukas Ertl
+ *  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 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 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bio.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/systm.h>
+
+#include <geom/geom.h>
+#include <geom/vinum/geom_vinum_var.h>
+#include <geom/vinum/geom_vinum.h>
+#include <geom/vinum/geom_vinum_share.h>
+
+#if 0
+SYSCTL_DECL(_kern_geom);
+SYSCTL_NODE(_kern_geom, OID_AUTO, vinum, CTLFLAG_RW, 0, "GEOM_VINUM stuff");
+SYSCTL_UINT(_kern_geom_vinum, OID_AUTO, debug, CTLFLAG_RW, &gv_debug, 0,
+    "Debug level");
+#endif
+
+int	gv_create(struct g_geom *, struct gctl_req *);
+void	config_new_drive(struct gv_drive *);
+
+static void
+gv_orphan(struct g_consumer *cp)
+{
+	struct g_geom *gp;
+	struct gv_softc *sc;
+	int error;
+	
+	g_topology_assert();
+
+	KASSERT(cp != NULL, ("gv_orphan: null cp"));
+	gp = cp->geom;
+	KASSERT(gp != NULL, ("gv_orphan: null gp"));
+	sc = gp->softc;
+
+	g_trace(G_T_TOPOLOGY, "gv_orphan(%s)", gp->name);
+
+	if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0)
+		g_access(cp, -cp->acr, -cp->acw, -cp->ace);
+	error = cp->provider->error;
+	if (error == 0)
+		error = ENXIO;
+	g_detach(cp);
+	g_destroy_consumer(cp);
+	if (!LIST_EMPTY(&gp->consumer))
+		return;
+	g_free(sc);
+	g_wither_geom(gp, error);
+}
+
+static void
+gv_start(struct bio *bp)
+{
+	struct bio *bp2;
+	struct g_geom *gp;
+	
+	gp = bp->bio_to->geom;
+	switch(bp->bio_cmd) {
+	case BIO_READ:
+	case BIO_WRITE:
+	case BIO_DELETE:
+		bp2 = g_clone_bio(bp);
+		bp2->bio_done = g_std_done;
+		g_io_request(bp2, LIST_FIRST(&gp->consumer));
+		return;
+	default:
+		g_io_deliver(bp, EOPNOTSUPP);
+		return;
+	}
+}
+
+static int
+gv_access(struct g_provider *pp, int dr, int dw, int de)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	int error;
+	
+	gp = pp->geom;
+	error = ENXIO;
+	cp = LIST_FIRST(&gp->consumer);
+	error = g_access(cp, dr, dw, de);
+	return (error);
+}
+
+static struct g_geom *
+gv_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	struct gv_softc *sc;
+	struct gv_hdr *vhdr;
+	int error, first;
+	char *buf;
+
+	vhdr = NULL;
+	buf = NULL;
+	first = 0;
+
+	g_trace(G_T_TOPOLOGY, "gv_taste(%s, %s)", mp->name, pp->name);
+	g_topology_assert();
+
+	if (pp->sectorsize == 0)
+		return (NULL);
+
+	/* Check if we already have a VINUM geom, or create a new one. */
+	if (LIST_EMPTY(&mp->geom)) { 
+		gp = g_new_geomf(mp, "VINUM");
+		gp->spoiled = gv_orphan;
+		gp->orphan = gv_orphan;
+		gp->access = gv_access;
+		gp->start = gv_start;
+		gp->softc = g_malloc(sizeof(struct gv_softc),
+		    M_WAITOK | M_ZERO);
+		sc = gp->softc;
+		sc->geom = gp;
+		LIST_INIT(&sc->drives);
+		LIST_INIT(&sc->subdisks);
+		LIST_INIT(&sc->plexes);
+		LIST_INIT(&sc->volumes);
+		first++;
+	} else {
+		gp = LIST_FIRST(&mp->geom);
+		sc = gp->softc;
+	}
+	
+
+	/* We need a temporary consumer to read the config from. */
+	cp = g_new_consumer(gp);
+	error = g_attach(cp, pp);
+	if (error) {
+		g_destroy_consumer(cp);
+		if (first) {
+			g_free(sc);
+			g_destroy_geom(gp);
+		}
+		return (NULL);
+	}
+	error = g_access(cp, 1, 0, 0);
+	if (error) {
+		g_detach(cp);
+		g_destroy_consumer(cp);
+		if (first) {
+			g_free(gp->softc);
+			g_destroy_geom(gp);
+		}
+		return (NULL);
+	}
+	
+	g_topology_unlock();
+
+	/* Check if the provided slice is a valid vinum drive. */
+	vhdr = g_read_data(cp, GV_HDR_OFFSET, GV_HDR_LEN, &error);
+	if (vhdr == NULL || error != 0) {
+		g_topology_lock();
+		g_access(cp, -1, 0, 0);
+		g_detach(cp);
+		g_destroy_consumer(cp);
+		if (first) {
+			g_free(sc);
+			g_destroy_geom(gp);
+		}
+		return (NULL);
+	}
+
+	/* This provider has no vinum magic on board. */
+	if (vhdr->magic != GV_MAGIC) {
+		/* Release the temporary consumer, we don't need it anymore. */
+		g_topology_lock();
+		g_access(cp, -1, 0, 0);
+		g_detach(cp);
+		g_destroy_consumer(cp);
+
+		g_free(vhdr);
+
+		/*
+		 * If there is no other VINUM geom yet just take this one; the
+		 * configuration is still empty, but it can be filled by other
+		 * valid vinum drives later.
+		 */
+		if (first)
+			return (gp);
+		else
+			return (NULL);
+
+	/*
+	 * We have found a valid vinum drive, now read the on-disk
+	 * configuration.
+	 */
+	} else {
+		g_free(vhdr);
+
+		buf = g_read_data(cp, GV_CFG_OFFSET, GV_CFG_LEN,
+		    &error);
+		if (buf == NULL || error != 0) {
+			g_topology_lock();
+			g_access(cp, -1, 0, 0);
+			g_detach(cp);
+			g_destroy_consumer(cp);
+			if (first) {
+				g_free(sc);
+				g_destroy_geom(gp);
+			}
+			return (NULL);
+		}
+
+		/* Release the temporary consumer, we don't need it anymore. */
+		g_topology_lock();
+		g_access(cp, -1, 0, 0);
+		g_detach(cp);
+		g_destroy_consumer(cp);
+
+		/* We are the first VINUM geom. */
+		if (first) {
+			gv_parse_config(sc, buf, 0);
+			g_free(buf);
+			return (gp);
+
+		/* Just merge the configs. */
+		} else {
+			gv_parse_config(sc, buf, 1);
+			g_free(buf);
+			return (NULL);
+		}
+	}
+}
+
+/* XXX this really belongs somewhere else */
+void
+config_new_drive(struct gv_drive *d)
+{
+	struct gv_hdr *vhdr;
+	struct gv_freelist *fl;
+
+	KASSERT(d != NULL, ("config_new_drive: NULL d"));
+
+	vhdr = g_malloc(sizeof(*vhdr), M_WAITOK | M_ZERO);
+	vhdr->magic = GV_MAGIC;
+	vhdr->config_length = GV_CFG_LEN;
+
+	bcopy(hostname, vhdr->label.sysname, GV_HOSTNAME_LEN);
+	strncpy(vhdr->label.name, d->name, GV_MAXDRIVENAME);
+	microtime(&vhdr->label.date_of_birth);
+
+	d->hdr = vhdr;
+
+	LIST_INIT(&d->subdisks);
+	LIST_INIT(&d->freelist);
+
+	fl = g_malloc(sizeof(struct gv_freelist), M_WAITOK | M_ZERO);
+	fl->offset = GV_DATA_START;
+	fl->size = d->avail;
+	LIST_INSERT_HEAD(&d->freelist, fl, freelist);
+	d->freelist_entries = 1;
+
+}
+
+/* Handle userland requests for creating new objects. */
+int
+gv_create(struct g_geom *gp, struct gctl_req *req)
+{
+	struct gv_softc *sc;
+	struct gv_drive *d, *d2;
+	struct gv_plex *p, *p2;
+	struct gv_sd *s, *s2;
+	struct gv_volume *v, *v2;
+	struct g_consumer *cp;
+	struct g_provider *pp;
+	int error, i, *drives, *plexes, *subdisks, *volumes;
+	char buf[20], errstr[ERRBUFSIZ];
+
+	g_topology_assert();
+
+	sc = gp->softc;
+
+	/* Find out how many of each object have been passed in. */
+	volumes = gctl_get_paraml(req, "volumes", sizeof(*volumes));
+	plexes = gctl_get_paraml(req, "plexes", sizeof(*plexes));
+	subdisks = gctl_get_paraml(req, "subdisks", sizeof(*subdisks));
+	drives = gctl_get_paraml(req, "drives", sizeof(*drives));
+
+	/* First, handle drive definitions ... */
+	for (i = 0; i < *drives; i++) {
+		snprintf(buf, sizeof(buf), "drive%d", i);
+		d2 = gctl_get_paraml(req, buf, sizeof(*d2));
+		d = g_malloc(sizeof(*d), M_WAITOK | M_ZERO);
+		bcopy(d2, d, sizeof(*d));
+
+		/* XXX */
+		pp = g_provider_by_name(d->device);
+		d->size = pp->mediasize - GV_DATA_START;
+		d->avail = d->size;
+
+		config_new_drive(d);
+
+		LIST_INSERT_HEAD(&sc->drives, d, drive);
+	}
+
+	/* ... then volume definitions ... */
+	for (i = 0; i < *volumes; i++) {
+		error = 0;
+		snprintf(buf, sizeof(buf), "volume%d", i);
+		v2 = gctl_get_paraml(req, buf, sizeof(*v2));
+
+		v = gv_find_vol(sc, v2->name);
+		if (v != NULL) {
+			gctl_error(req, "volume '%s' is already known",
+			    v->name);
+			return (-1);
+		}
+
+		v = g_malloc(sizeof(*v), M_WAITOK | M_ZERO);
+		bcopy(v2, v, sizeof(*v));
+
+		v->vinumconf = sc;
+		LIST_INIT(&v->plexes);
+		LIST_INSERT_HEAD(&sc->volumes, v, volume);
+	}
+
+	/* ... then plex definitions ... */
+	for (i = 0; i < *plexes; i++) {
+		error = 0;
+		snprintf(buf, sizeof(buf), "plex%d", i);
+		p2 = gctl_get_paraml(req, buf, sizeof(*p2));
+
+		p = gv_find_plex(sc, p2->name);
+		if (p != NULL) {
+			gctl_error(req, "plex '%s' is already known", p->name);
+			return (-1);
+		}
+
+		p = g_malloc(sizeof(*p), M_WAITOK | M_ZERO);
+		bcopy(p2, p, sizeof(*p));
+
+		/* Find the volume this plex should be attached to. */
+		v = gv_find_vol(sc, p->volume);
+		if (v != NULL) {
+			if (v->plexcount)
+				p->flags |= GV_PLEX_ADDED;
+			p->vol_sc = v;
+			v->plexcount++;
+			LIST_INSERT_HEAD(&v->plexes, p, in_volume);
+		}
+
+		p->vinumconf = sc;
+		LIST_INIT(&p->subdisks);
+		LIST_INSERT_HEAD(&sc->plexes, p, plex);
+	}
+
+	/* ... and finally, subdisk definitions. */
+	for (i = 0; i < *subdisks; i++) {
+		error = 0;
+		snprintf(buf, sizeof(buf), "sd%d", i);
+		s2 = gctl_get_paraml(req, buf, sizeof(*s2));
+
+		s = gv_find_sd(sc, s2->name);
+		if (s != NULL) {
+			gctl_error(req, "subdisk '%s' is already known",
+			    s->name);
+			return (-1);
+		}
+
+		s = g_malloc(sizeof(*s), M_WAITOK | M_ZERO);
+		bcopy(s2, s, sizeof(*s));
+
+		/* Find the drive where this subdisk should be put on. */
+		d = gv_find_drive(sc, s->drive);
+
+		/* drive not found - XXX */
+		if (d == NULL) {
+			printf("FOO: drive '%s' not found\n", s->drive);
+			g_free(s);
+			continue;
+		}
+
+		/* Find the plex where this subdisk belongs to. */
+		p = gv_find_plex(sc, s->plex);
+
+		/* plex not found - XXX */
+		if (p == NULL) {
+			printf("FOO: plex '%s' not found\n", s->plex);
+			g_free(s);
+			continue;
+		}
+
+		/*
+		 * First we give the subdisk to the drive, to handle autosized
+		 * values ...
+		 */
+		error = gv_sd_to_drive(sc, d, s, errstr, sizeof(errstr));
+		if (error) {
+			gctl_error(req, errstr);
+			g_free(s);
+			continue;
+		}
+
+		/*
+		 * Then, we give the subdisk to the plex; we check if the
+		 * given values are correct and maybe adjust them.
+		 */
+		error = gv_sd_to_plex(p, s, 1);
+		if (error) {
+			printf("FOO: couldn't give sd '%s' to plex '%s'\n",
+			    s->name, p->name);
+		}
+		s->flags |= GV_SD_NEWBORN;
+
+		s->vinumconf = sc;
+		LIST_INSERT_HEAD(&sc->subdisks, s, sd);
+	}
+
+	LIST_FOREACH(s, &sc->subdisks, sd)
+		gv_update_sd_state(s);
+	LIST_FOREACH(p, &sc->plexes, plex)
+		gv_update_plex_config(p);
+	LIST_FOREACH(v, &sc->volumes, volume)
+		gv_update_vol_state(v);
+
+	/*
+	 * Write out the configuration to each drive.  If the drive doesn't
+	 * have a valid geom_slice geom yet, attach it temporarily to our VINUM
+	 * geom.
+	 */
+	LIST_FOREACH(d, &sc->drives, drive) {
+		if (d->geom == NULL) {
+			/* XXX */
+			pp = g_provider_by_name(d->device);
+			cp = g_new_consumer(gp);
+			g_attach(cp, pp);
+			gv_save_config(cp, d, sc);
+			g_detach(cp);
+			g_destroy_consumer(cp);
+		} else
+			gv_save_config(NULL, d, sc);
+	}
+
+	return (0);
+}
+
+static void
+gv_config(struct gctl_req *req, struct g_class *mp, char const *verb)
+{
+	struct g_geom *gp;
+	struct gv_softc *sc;
+	struct sbuf *sb;
+	char *comment;
+
+	g_topology_assert();
+
+	gp = LIST_FIRST(&mp->geom);
+	sc = gp->softc;
+
+	if (!strcmp(verb, "list")) {
+		gv_list(gp, req);
+
+	/* Save our configuration back to disk. */
+	} else if (!strcmp(verb, "saveconfig")) {
+
+		gv_save_config_all(sc);
+
+	/* Return configuration in string form. */
+	} else if (!strcmp(verb, "getconfig")) {
+		comment = gctl_get_param(req, "comment", NULL);
+
+		sb = sbuf_new(NULL, NULL, GV_CFG_LEN, SBUF_FIXEDLEN);
+		gv_format_config(sc, sb, 0, comment);
+		sbuf_finish(sb);
+		gctl_set_param(req, "config", sbuf_data(sb), sbuf_len(sb) + 1);
+		sbuf_delete(sb);
+
+	} else if (!strcmp(verb, "create")) {
+		gv_create(gp, req);
+
+	} else if (!strcmp(verb, "remove")) {
+		gv_remove(gp, req);
+
+	} else if (!strcmp(verb, "start")) {
+		gv_start_obj(gp, req);
+
+	} else
+		gctl_error(req, "Unknown verb parameter");
+}
+
+static int
+gv_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
+{
+	struct g_geom *gp2;
+	struct gv_softc *sc;
+	struct gv_drive *d, *d2;
+	struct gv_freelist *fl, *fl2;
+
+	g_trace(G_T_TOPOLOGY, "gv_destroy_geom: %s", gp->name);
+	g_topology_assert();
+
+	KASSERT(gp != NULL, ("gv_destroy_geom: null gp"));
+	KASSERT(gp->softc != NULL, ("gv_destroy_geom: null sc"));
+
+	sc = gp->softc;
+
+	/*
+	 * Check if any of our drives is still open; if so, refuse destruction.
+	 */
+	LIST_FOREACH(d, &sc->drives, drive) {
+		gp2 = d->geom;
+		if (gv_is_open(gp2))
+			return (EBUSY);
+	}
+
+	LIST_FOREACH_SAFE(d, &sc->drives, drive, d2) {
+		g_free(d->hdr);
+		d->hdr = NULL;
+		LIST_FOREACH_SAFE(fl, &d->freelist, freelist, fl2) {
+			d->freelist_entries--;
+			LIST_REMOVE(fl, freelist);
+			g_free(fl);
+			fl = NULL;
+		}
+		LIST_REMOVE(d, drive);
+	}
+
+	g_free(sc);
+	sc = NULL;
+	g_wither_geom(gp, ENXIO);
+	return (0);
+}
+
+#define	VINUM_CLASS_NAME "VINUM"
+
+static struct g_class g_vinum_class	= {
+	.name = VINUM_CLASS_NAME,
+	.taste = gv_taste,
+	.destroy_geom = gv_destroy_geom,
+	.ctlreq = gv_config,
+};
+
+DECLARE_GEOM_CLASS(g_vinum_class, g_vinum);