2007-02-27 04:01:58 +00:00
|
|
|
/*-
|
|
|
|
* Copyright (c) 2006-2007 Matthew Jacob <mjacob@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.
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
* Based upon work by Pawel Jakub Dawidek <pjd@FreeBSD.org> for all of the
|
|
|
|
* fine geom examples, and by Poul Henning Kamp <phk@FreeBSD.org> for GEOM
|
|
|
|
* itself, all of which is most gratefully acknowledged.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#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/sysctl.h>
|
|
|
|
#include <sys/kthread.h>
|
|
|
|
#include <sys/malloc.h>
|
|
|
|
#include <geom/geom.h>
|
|
|
|
#include <geom/multipath/g_multipath.h>
|
|
|
|
|
|
|
|
|
|
|
|
SYSCTL_DECL(_kern_geom);
|
|
|
|
SYSCTL_NODE(_kern_geom, OID_AUTO, multipath, CTLFLAG_RW, 0,
|
|
|
|
"GEOM_MULTIPATH tunables");
|
|
|
|
static u_int g_multipath_debug = 0;
|
|
|
|
SYSCTL_UINT(_kern_geom_multipath, OID_AUTO, debug, CTLFLAG_RW,
|
|
|
|
&g_multipath_debug, 0, "Debug level");
|
|
|
|
|
|
|
|
static enum {
|
|
|
|
GKT_NIL,
|
|
|
|
GKT_RUN,
|
|
|
|
GKT_DIE
|
|
|
|
} g_multipath_kt_state;
|
|
|
|
static struct bio_queue_head gmtbq;
|
|
|
|
static struct mtx gmtbq_mtx;
|
|
|
|
|
|
|
|
static void g_multipath_orphan(struct g_consumer *);
|
|
|
|
static void g_multipath_start(struct bio *);
|
|
|
|
static void g_multipath_done(struct bio *);
|
|
|
|
static void g_multipath_done_error(struct bio *);
|
|
|
|
static void g_multipath_kt(void *);
|
|
|
|
|
|
|
|
static int g_multipath_destroy(struct g_geom *);
|
|
|
|
static int
|
|
|
|
g_multipath_destroy_geom(struct gctl_req *, struct g_class *, struct g_geom *);
|
|
|
|
|
|
|
|
static g_taste_t g_multipath_taste;
|
|
|
|
static g_ctl_req_t g_multipath_config;
|
|
|
|
static g_init_t g_multipath_init;
|
|
|
|
static g_fini_t g_multipath_fini;
|
|
|
|
|
|
|
|
struct g_class g_multipath_class = {
|
|
|
|
.name = G_MULTIPATH_CLASS_NAME,
|
|
|
|
.version = G_VERSION,
|
|
|
|
.ctlreq = g_multipath_config,
|
|
|
|
.taste = g_multipath_taste,
|
|
|
|
.destroy_geom = g_multipath_destroy_geom,
|
|
|
|
.init = g_multipath_init,
|
|
|
|
.fini = g_multipath_fini
|
|
|
|
};
|
|
|
|
|
|
|
|
#define MP_BAD 0x1
|
|
|
|
#define MP_POSTED 0x2
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_mpd(void *arg, int flags __unused)
|
|
|
|
{
|
|
|
|
struct g_consumer *cp;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
cp = arg;
|
|
|
|
if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) {
|
|
|
|
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
|
|
|
|
}
|
|
|
|
if (cp->provider) {
|
|
|
|
printf("GEOM_MULTIPATH: %s removed from %s\n",
|
|
|
|
cp->provider->name, cp->geom->name);
|
|
|
|
g_detach(cp);
|
|
|
|
}
|
|
|
|
g_destroy_consumer(cp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_orphan(struct g_consumer *cp)
|
|
|
|
{
|
|
|
|
if ((cp->index & MP_POSTED) == 0) {
|
|
|
|
cp->index |= MP_POSTED;
|
|
|
|
printf("GEOM_MULTIPATH: %s orphaned in %s\n",
|
|
|
|
cp->provider->name, cp->geom->name);
|
|
|
|
g_mpd(cp, 0);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_start(struct bio *bp)
|
|
|
|
{
|
|
|
|
struct g_multipath_softc *sc;
|
|
|
|
struct g_geom *gp;
|
|
|
|
struct g_consumer *cp;
|
|
|
|
struct bio *cbp;
|
|
|
|
|
|
|
|
gp = bp->bio_to->geom;
|
|
|
|
sc = gp->softc;
|
|
|
|
KASSERT(sc != NULL, ("NULL sc"));
|
|
|
|
cp = sc->cp_active;
|
|
|
|
if (cp == NULL) {
|
|
|
|
g_io_deliver(bp, ENXIO);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
cbp = g_clone_bio(bp);
|
|
|
|
if (cbp == NULL) {
|
|
|
|
g_io_deliver(bp, ENOMEM);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
cbp->bio_done = g_multipath_done;
|
|
|
|
g_io_request(cbp, cp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_done(struct bio *bp)
|
|
|
|
{
|
|
|
|
if (bp->bio_error == ENXIO || bp->bio_error == EIO) {
|
|
|
|
mtx_lock(&gmtbq_mtx);
|
|
|
|
bioq_insert_tail(&gmtbq, bp);
|
|
|
|
wakeup(&g_multipath_kt_state);
|
|
|
|
mtx_unlock(&gmtbq_mtx);
|
|
|
|
} else {
|
|
|
|
g_std_done(bp);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_done_error(struct bio *bp)
|
|
|
|
{
|
|
|
|
struct bio *pbp;
|
|
|
|
struct g_geom *gp;
|
|
|
|
struct g_multipath_softc *sc;
|
|
|
|
struct g_consumer *cp;
|
|
|
|
struct g_provider *pp;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If we had a failure, we have to check first to see
|
|
|
|
* whether the consumer it failed on was the currently
|
|
|
|
* active consumer (i.e., this is the first in perhaps
|
|
|
|
* a number of failures). If so, we then switch consumers
|
|
|
|
* to the next available consumer.
|
|
|
|
*/
|
|
|
|
|
|
|
|
g_topology_lock();
|
|
|
|
pbp = bp->bio_parent;
|
|
|
|
gp = pbp->bio_to->geom;
|
|
|
|
sc = gp->softc;
|
|
|
|
cp = bp->bio_from;
|
|
|
|
pp = cp->provider;
|
|
|
|
|
|
|
|
cp->index |= MP_BAD;
|
|
|
|
if (cp->nend == cp->nstart && pp->nend == pp->nstart) {
|
|
|
|
cp->index |= MP_POSTED;
|
|
|
|
g_post_event(g_mpd, cp, M_NOWAIT, NULL);
|
|
|
|
}
|
|
|
|
if (cp == sc->cp_active) {
|
|
|
|
struct g_consumer *lcp;
|
|
|
|
printf("GEOM_MULTIPATH: %s failed in %s\n",
|
|
|
|
pp->name, sc->sc_name);
|
|
|
|
sc->cp_active = NULL;
|
|
|
|
LIST_FOREACH(lcp, &gp->consumer, consumer) {
|
|
|
|
if ((lcp->index & MP_BAD) == 0) {
|
|
|
|
sc->cp_active = lcp;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (sc->cp_active == NULL) {
|
|
|
|
printf("GEOM_MULTIPATH: out of providers for %s\n",
|
|
|
|
sc->sc_name);
|
2009-08-27 08:28:34 +00:00
|
|
|
g_topology_unlock();
|
2007-02-27 04:01:58 +00:00
|
|
|
return;
|
|
|
|
} else {
|
|
|
|
printf("GEOM_MULTIPATH: %s now active path in %s\n",
|
|
|
|
sc->cp_active->provider->name, sc->sc_name);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
g_topology_unlock();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If we can fruitfully restart the I/O, do so.
|
|
|
|
*/
|
|
|
|
if (sc->cp_active) {
|
|
|
|
g_destroy_bio(bp);
|
|
|
|
pbp->bio_children--;
|
|
|
|
g_multipath_start(pbp);
|
|
|
|
} else {
|
|
|
|
g_std_done(bp);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_kt(void *arg)
|
|
|
|
{
|
|
|
|
g_multipath_kt_state = GKT_RUN;
|
|
|
|
mtx_lock(&gmtbq_mtx);
|
|
|
|
while (g_multipath_kt_state == GKT_RUN) {
|
|
|
|
for (;;) {
|
|
|
|
struct bio *bp;
|
|
|
|
bp = bioq_takefirst(&gmtbq);
|
|
|
|
if (bp == NULL) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
mtx_unlock(&gmtbq_mtx);
|
|
|
|
g_multipath_done_error(bp);
|
|
|
|
mtx_lock(&gmtbq_mtx);
|
|
|
|
}
|
|
|
|
msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO,
|
|
|
|
"gkt:wait", hz / 10);
|
|
|
|
}
|
|
|
|
mtx_unlock(&gmtbq_mtx);
|
|
|
|
wakeup(&g_multipath_kt_state);
|
2007-10-20 23:23:23 +00:00
|
|
|
kproc_exit(0);
|
2007-02-27 04:01:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
g_multipath_access(struct g_provider *pp, int dr, int dw, int de)
|
|
|
|
{
|
|
|
|
struct g_geom *gp;
|
|
|
|
struct g_consumer *cp, *badcp = NULL;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
gp = pp->geom;
|
|
|
|
|
|
|
|
LIST_FOREACH(cp, &gp->consumer, consumer) {
|
|
|
|
error = g_access(cp, dr, dw, de);
|
|
|
|
if (error) {
|
|
|
|
badcp = cp;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
fail:
|
|
|
|
LIST_FOREACH(cp, &gp->consumer, consumer) {
|
|
|
|
if (cp == badcp) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
(void) g_access(cp, -dr, -dw, -de);
|
|
|
|
}
|
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct g_geom *
|
|
|
|
g_multipath_create(struct g_class *mp, struct g_multipath_metadata *md)
|
|
|
|
{
|
|
|
|
struct g_multipath_softc *sc;
|
|
|
|
struct g_geom *gp;
|
|
|
|
struct g_provider *pp;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
|
|
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
|
|
if (strcmp(gp->name, md->md_name) == 0) {
|
|
|
|
printf("GEOM_MULTIPATH: name %s already exists\n",
|
|
|
|
md->md_name);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
gp = g_new_geomf(mp, md->md_name);
|
|
|
|
if (gp == NULL) {
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
|
|
|
|
gp->softc = sc;
|
|
|
|
gp->start = g_multipath_start;
|
|
|
|
gp->orphan = g_multipath_orphan;
|
|
|
|
gp->access = g_multipath_access;
|
|
|
|
memcpy(sc->sc_uuid, md->md_uuid, sizeof (sc->sc_uuid));
|
|
|
|
memcpy(sc->sc_name, md->md_name, sizeof (sc->sc_name));
|
|
|
|
|
|
|
|
pp = g_new_providerf(gp, "multipath/%s", md->md_name);
|
|
|
|
if (pp == NULL) {
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
/* limit the provider to not have it stomp on metadata */
|
|
|
|
pp->mediasize = md->md_size - md->md_sectorsize;
|
|
|
|
pp->sectorsize = md->md_sectorsize;
|
|
|
|
sc->pp = pp;
|
|
|
|
g_error_provider(pp, 0);
|
|
|
|
return (gp);
|
|
|
|
fail:
|
|
|
|
if (gp != NULL) {
|
|
|
|
if (gp->softc != NULL) {
|
|
|
|
g_free(gp->softc);
|
|
|
|
}
|
|
|
|
g_destroy_geom(gp);
|
|
|
|
}
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
g_multipath_add_disk(struct g_geom *gp, struct g_provider *pp)
|
|
|
|
{
|
|
|
|
struct g_multipath_softc *sc;
|
|
|
|
struct g_consumer *cp, *nxtcp;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
|
|
|
|
sc = gp->softc;
|
|
|
|
KASSERT(sc, ("no softc"));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Make sure that the passed provider isn't already attached
|
|
|
|
*/
|
|
|
|
LIST_FOREACH(cp, &gp->consumer, consumer) {
|
|
|
|
if (cp->provider == pp) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (cp) {
|
|
|
|
printf("GEOM_MULTIPATH: provider %s already attached to %s\n",
|
|
|
|
pp->name, gp->name);
|
|
|
|
return (EEXIST);
|
|
|
|
}
|
|
|
|
nxtcp = LIST_FIRST(&gp->consumer);
|
|
|
|
cp = g_new_consumer(gp);
|
|
|
|
if (cp == NULL) {
|
|
|
|
return (ENOMEM);
|
|
|
|
}
|
|
|
|
error = g_attach(cp, pp);
|
|
|
|
if (error != 0) {
|
|
|
|
printf("GEOM_MULTIPATH: cannot attach %s to %s",
|
|
|
|
pp->name, sc->sc_name);
|
|
|
|
g_destroy_consumer(cp);
|
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
cp->private = sc;
|
|
|
|
cp->index = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set access permissions on new consumer to match other consumers
|
|
|
|
*/
|
|
|
|
if (nxtcp && (nxtcp->acr + nxtcp->acw + nxtcp->ace)) {
|
|
|
|
error = g_access(cp, nxtcp->acr, nxtcp->acw, nxtcp->ace);
|
|
|
|
if (error) {
|
|
|
|
printf("GEOM_MULTIPATH: cannot set access in "
|
|
|
|
"attaching %s to %s/%s (%d)\n",
|
|
|
|
pp->name, sc->sc_name, sc->sc_uuid, error);
|
|
|
|
g_detach(cp);
|
|
|
|
g_destroy_consumer(cp);
|
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
printf("GEOM_MULTIPATH: adding %s to %s/%s\n",
|
|
|
|
pp->name, sc->sc_name, sc->sc_uuid);
|
|
|
|
if (sc->cp_active == NULL) {
|
|
|
|
sc->cp_active = cp;
|
|
|
|
printf("GEOM_MULTIPATH: %s now active path in %s\n",
|
|
|
|
pp->name, sc->sc_name);
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
g_multipath_destroy(struct g_geom *gp)
|
|
|
|
{
|
|
|
|
struct g_provider *pp;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
if (gp->softc == NULL) {
|
|
|
|
return (ENXIO);
|
|
|
|
}
|
|
|
|
pp = LIST_FIRST(&gp->provider);
|
|
|
|
if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
|
|
|
|
return (EBUSY);
|
|
|
|
}
|
|
|
|
printf("GEOM_MULTIPATH: destroying %s\n", gp->name);
|
|
|
|
g_free(gp->softc);
|
|
|
|
gp->softc = NULL;
|
|
|
|
g_wither_geom(gp, ENXIO);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
g_multipath_destroy_geom(struct gctl_req *req, struct g_class *mp,
|
|
|
|
struct g_geom *gp)
|
|
|
|
{
|
|
|
|
return (g_multipath_destroy(gp));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_init(struct g_class *mp)
|
|
|
|
{
|
|
|
|
bioq_init(&gmtbq);
|
|
|
|
mtx_init(&gmtbq_mtx, "gmtbq", NULL, MTX_DEF);
|
2007-10-20 23:23:23 +00:00
|
|
|
if (kproc_create(g_multipath_kt, mp, NULL, 0, 0, "g_mp_kt") == 0) {
|
2007-02-27 04:01:58 +00:00
|
|
|
g_multipath_kt_state = GKT_RUN;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_fini(struct g_class *mp)
|
|
|
|
{
|
|
|
|
if (g_multipath_kt_state == GKT_RUN) {
|
|
|
|
mtx_lock(&gmtbq_mtx);
|
|
|
|
g_multipath_kt_state = GKT_DIE;
|
|
|
|
wakeup(&g_multipath_kt_state);
|
|
|
|
msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO,
|
|
|
|
"gmp:fini", 0);
|
|
|
|
mtx_unlock(&gmtbq_mtx);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
g_multipath_read_metadata(struct g_consumer *cp,
|
|
|
|
struct g_multipath_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);
|
|
|
|
}
|
|
|
|
multipath_metadata_decode(buf, md);
|
|
|
|
g_free(buf);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct g_geom *
|
|
|
|
g_multipath_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
|
|
|
|
{
|
|
|
|
struct g_multipath_metadata md;
|
|
|
|
struct g_multipath_softc *sc;
|
|
|
|
struct g_consumer *cp;
|
|
|
|
struct g_geom *gp, *gp1;
|
|
|
|
int error, isnew;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
|
|
|
|
gp = g_new_geomf(mp, "multipath:taste");
|
|
|
|
gp->start = g_multipath_start;
|
|
|
|
gp->access = g_multipath_access;
|
|
|
|
gp->orphan = g_multipath_orphan;
|
|
|
|
cp = g_new_consumer(gp);
|
|
|
|
g_attach(cp, pp);
|
|
|
|
error = g_multipath_read_metadata(cp, &md);
|
|
|
|
g_detach(cp);
|
|
|
|
g_destroy_consumer(cp);
|
|
|
|
g_destroy_geom(gp);
|
|
|
|
if (error != 0) {
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
gp = NULL;
|
|
|
|
|
|
|
|
if (strcmp(md.md_magic, G_MULTIPATH_MAGIC) != 0) {
|
|
|
|
if (g_multipath_debug) {
|
|
|
|
printf("%s is not MULTIPATH\n", pp->name);
|
|
|
|
}
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (md.md_version != G_MULTIPATH_VERSION) {
|
|
|
|
printf("%s has version %d multipath id- this module is version "
|
|
|
|
" %d: rejecting\n", pp->name, md.md_version,
|
|
|
|
G_MULTIPATH_VERSION);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (g_multipath_debug) {
|
|
|
|
printf("MULTIPATH: %s/%s\n", md.md_name, md.md_uuid);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Let's check if such a device already is present. We check against
|
|
|
|
* uuid alone first because that's the true distinguishor. If that
|
|
|
|
* passes, then we check for name conflicts. If there are conflicts,
|
|
|
|
* modify the name.
|
|
|
|
*
|
|
|
|
* The whole purpose of this is to solve the problem that people don't
|
|
|
|
* pick good unique names, but good unique names (like uuids) are a
|
|
|
|
* pain to use. So, we allow people to build GEOMs with friendly names
|
|
|
|
* and uuids, and modify the names in case there's a collision.
|
|
|
|
*/
|
|
|
|
sc = NULL;
|
|
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
|
|
sc = gp->softc;
|
|
|
|
if (sc == NULL) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (strncmp(md.md_uuid, sc->sc_uuid, sizeof(md.md_uuid)) == 0) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
LIST_FOREACH(gp1, &mp->geom, geom) {
|
|
|
|
if (gp1 == gp) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
sc = gp1->softc;
|
|
|
|
if (sc == NULL) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (strncmp(md.md_name, sc->sc_name, sizeof(md.md_name)) == 0) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If gp is NULL, we had no extant MULTIPATH geom with this uuid.
|
|
|
|
*
|
|
|
|
* If gp1 is *not* NULL, that means we have a MULTIPATH geom extant
|
|
|
|
* with the same name (but a different UUID).
|
|
|
|
*
|
|
|
|
* If gp is NULL, then modify the name with a random number and
|
|
|
|
* complain, but allow the creation of the geom to continue.
|
|
|
|
*
|
|
|
|
* If gp is *not* NULL, just use the geom's name as we're attaching
|
|
|
|
* this disk to the (previously generated) name.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (gp1) {
|
|
|
|
sc = gp1->softc;
|
|
|
|
if (gp == NULL) {
|
|
|
|
char buf[16];
|
|
|
|
u_long rand = random();
|
|
|
|
|
|
|
|
snprintf(buf, sizeof (buf), "%s-%lu", md.md_name, rand);
|
|
|
|
printf("GEOM_MULTIPATH: geom %s/%s exists already\n",
|
|
|
|
sc->sc_name, sc->sc_uuid);
|
|
|
|
printf("GEOM_MULTIPATH: %s will be (temporarily) %s\n",
|
|
|
|
md.md_uuid, buf);
|
|
|
|
strlcpy(md.md_name, buf, sizeof (md.md_name));
|
|
|
|
} else {
|
|
|
|
strlcpy(md.md_name, sc->sc_name, sizeof (md.md_name));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (gp == NULL) {
|
|
|
|
gp = g_multipath_create(mp, &md);
|
|
|
|
if (gp == NULL) {
|
|
|
|
printf("GEOM_MULTIPATH: cannot create geom %s/%s\n",
|
|
|
|
md.md_name, md.md_uuid);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
isnew = 1;
|
|
|
|
} else {
|
|
|
|
isnew = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
sc = gp->softc;
|
|
|
|
KASSERT(sc != NULL, ("sc is NULL"));
|
|
|
|
error = g_multipath_add_disk(gp, pp);
|
|
|
|
if (error != 0) {
|
|
|
|
if (isnew) {
|
|
|
|
g_multipath_destroy(gp);
|
|
|
|
}
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
return (gp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_ctl_create(struct gctl_req *req, struct g_class *mp)
|
|
|
|
{
|
|
|
|
struct g_geom *gp;
|
|
|
|
struct g_provider *pp0, *pp1;
|
|
|
|
struct g_multipath_metadata md;
|
|
|
|
const char *name, *mpname, *uuid;
|
|
|
|
static const char devpf[6] = "/dev/";
|
|
|
|
int *nargs, error;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
|
|
|
|
mpname = gctl_get_asciiparam(req, "arg0");
|
|
|
|
if (mpname == NULL) {
|
|
|
|
gctl_error(req, "No 'arg0' argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
|
|
|
|
if (nargs == NULL) {
|
|
|
|
gctl_error(req, "No 'nargs' argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (*nargs != 4) {
|
|
|
|
gctl_error(req, "missing device or uuid arguments");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
name = gctl_get_asciiparam(req, "arg1");
|
|
|
|
if (name == NULL) {
|
|
|
|
gctl_error(req, "No 'arg1' argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (strncmp(name, devpf, 5) == 0) {
|
|
|
|
name += 5;
|
|
|
|
}
|
|
|
|
pp0 = g_provider_by_name(name);
|
|
|
|
if (pp0 == NULL) {
|
|
|
|
gctl_error(req, "Provider %s is invalid", name);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
name = gctl_get_asciiparam(req, "arg2");
|
|
|
|
if (name == NULL) {
|
|
|
|
gctl_error(req, "No 'arg2' argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (strncmp(name, devpf, 5) == 0) {
|
|
|
|
name += 5;
|
|
|
|
}
|
|
|
|
pp1 = g_provider_by_name(name);
|
|
|
|
if (pp1 == NULL) {
|
|
|
|
gctl_error(req, "Provider %s is invalid", name);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
uuid = gctl_get_asciiparam(req, "arg3");
|
|
|
|
if (uuid == NULL) {
|
|
|
|
gctl_error(req, "No uuid argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (strlen(uuid) != 36) {
|
|
|
|
gctl_error(req, "Malformed uuid argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check to make sure parameters from the two providers are the same
|
|
|
|
*/
|
|
|
|
if (pp0 == pp1) {
|
|
|
|
gctl_error(req, "providers %s and %s are the same",
|
|
|
|
pp0->name, pp1->name);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (pp0->mediasize != pp1->mediasize) {
|
|
|
|
gctl_error(req, "Provider %s is %jd; Provider %s is %jd",
|
|
|
|
pp0->name, (intmax_t) pp0->mediasize,
|
|
|
|
pp1->name, (intmax_t) pp1->mediasize);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (pp0->sectorsize != pp1->sectorsize) {
|
|
|
|
gctl_error(req, "Provider %s has sectorsize %u; Provider %s "
|
|
|
|
"has sectorsize %u", pp0->name, pp0->sectorsize,
|
|
|
|
pp1->name, pp1->sectorsize);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* cons up enough of a metadata structure to use.
|
|
|
|
*/
|
|
|
|
memset(&md, 0, sizeof(md));
|
|
|
|
md.md_size = pp0->mediasize;
|
|
|
|
md.md_sectorsize = pp0->sectorsize;
|
|
|
|
strncpy(md.md_name, mpname, sizeof (md.md_name));
|
|
|
|
strncpy(md.md_uuid, uuid, sizeof (md.md_uuid));
|
|
|
|
|
|
|
|
gp = g_multipath_create(mp, &md);
|
|
|
|
if (gp == NULL) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
error = g_multipath_add_disk(gp, pp0);
|
|
|
|
if (error) {
|
|
|
|
g_multipath_destroy(gp);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
error = g_multipath_add_disk(gp, pp1);
|
|
|
|
if (error) {
|
|
|
|
g_multipath_destroy(gp);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct g_geom *
|
|
|
|
g_multipath_find_geom(struct g_class *mp, const char *name)
|
|
|
|
{
|
|
|
|
struct g_geom *gp;
|
|
|
|
|
|
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
|
|
if (strcmp(gp->name, name) == 0) {
|
|
|
|
return (gp);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_ctl_destroy(struct gctl_req *req, struct g_class *mp)
|
|
|
|
{
|
|
|
|
struct g_geom *gp;
|
|
|
|
const char *name;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
g_topology_assert();
|
|
|
|
|
|
|
|
name = gctl_get_asciiparam(req, "arg0");
|
|
|
|
if (name == NULL) {
|
|
|
|
gctl_error(req, "No 'arg0' argument");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
gp = g_multipath_find_geom(mp, name);
|
|
|
|
if (gp == NULL) {
|
|
|
|
gctl_error(req, "Device %s is invalid", name);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
error = g_multipath_destroy(gp);
|
|
|
|
if (error != 0) {
|
|
|
|
gctl_error(req, "failed to destroy %s (err=%d)", name, error);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
g_multipath_config(struct gctl_req *req, struct g_class *mp, const char *verb)
|
|
|
|
{
|
|
|
|
uint32_t *version;
|
|
|
|
g_topology_assert();
|
|
|
|
version = gctl_get_paraml(req, "version", sizeof(*version));
|
|
|
|
if (version == NULL) {
|
|
|
|
gctl_error(req, "No 'version' argument");
|
|
|
|
} else if (*version != G_MULTIPATH_VERSION) {
|
|
|
|
gctl_error(req, "Userland and kernel parts are out of sync");
|
|
|
|
} else if (strcmp(verb, "create") == 0) {
|
|
|
|
g_multipath_ctl_create(req, mp);
|
|
|
|
} else if (strcmp(verb, "destroy") == 0) {
|
|
|
|
g_multipath_ctl_destroy(req, mp);
|
|
|
|
} else {
|
|
|
|
gctl_error(req, "Unknown verb %s", verb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
DECLARE_GEOM_CLASS(g_multipath_class, g_multipath);
|