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freebsd-skq/sys/geom/multipath/g_multipath.c
Alexander Motin 0c883cef45 Major GEOM MULTIPATH class rewrite: 
- Improved locking and destruction process to fix crashes.
 - Improved "automatic" configuration method to make it consistent and safe
by reading metadata back from all specified paths after writing to one.
 - Added provider size check to reduce chance of ordering conflict with
other GEOM classes.
 - Added "manual" configuration method without using on-disk metadata.
 - Added "add" and "remove" commands to allow manage paths manually.
 - Failed paths are no longer dropped from geom, but only marked as FAIL
and excluded from I/O operations.
 - Automatically restore failed paths when all others paths are marked
as failed, for example, because of device-caused (not transport) errors.
 - Added "fail" and "restore" commands to manually control FAIL flag.
 - geom is now destroyed on last path disconnection.
 - Added optional Active/Active mode support. Unlike Active/Passive
mode, load evenly distributed between all working paths. If supported by
the device, it allows to significantly improve performance, utilizing
bandwidth of all paths. It is controlled by -A option during creation.
Disabled by default now.
 - Improved `status` and `list` commands output.

Sponsored by:	iXsystems, inc.
MFC after:	1 month
2011-11-12 09:52:27 +00:00

1267 lines
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/*-
* Copyright (c) 2011 Alexander Motin <mav@FreeBSD.org>
* 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/sbuf.h>
#include <sys/sysctl.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <geom/geom.h>
#include <geom/multipath/g_multipath.h>
FEATURE(geom_multipath, "GEOM multipath support");
SYSCTL_DECL(_kern_geom);
static 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 u_int g_multipath_exclusive = 1;
SYSCTL_UINT(_kern_geom_multipath, OID_AUTO, exclusive, CTLFLAG_RW,
&g_multipath_exclusive, 0, "Exclusively open providers");
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 struct g_geom *g_multipath_find_geom(struct g_class *, const char *);
static int g_multipath_rotate(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;
static g_dumpconf_t g_multipath_dumpconf;
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_FAIL 0x00000001
#define MP_LOST 0x00000002
#define MP_NEW 0x00000004
#define MP_POSTED 0x00000008
#define MP_BAD (MP_FAIL | MP_LOST | MP_NEW)
#define MP_IDLE 0x00000010
#define MP_IDLE_MASK 0xfffffff0
static int
g_multipath_good(struct g_geom *gp)
{
struct g_consumer *cp;
int n = 0;
LIST_FOREACH(cp, &gp->consumer, consumer) {
if ((cp->index & MP_BAD) == 0)
n++;
}
return (n);
}
static void
g_multipath_fault(struct g_consumer *cp, int cause)
{
struct g_multipath_softc *sc;
struct g_consumer *lcp;
struct g_geom *gp;
gp = cp->geom;
sc = gp->softc;
cp->index |= cause;
if (g_multipath_good(gp) == 0 && sc->sc_ndisks > 0) {
LIST_FOREACH(lcp, &gp->consumer, consumer) {
if (lcp->provider == NULL ||
(lcp->index & (MP_LOST | MP_NEW)))
continue;
if (sc->sc_ndisks > 1 && lcp == cp)
continue;
printf("GEOM_MULTIPATH: "
"all paths in %s were marked FAIL, restore %s\n",
sc->sc_name, lcp->provider->name);
lcp->index &= ~MP_FAIL;
}
}
if (cp != sc->sc_active)
return;
sc->sc_active = NULL;
LIST_FOREACH(lcp, &gp->consumer, consumer) {
if ((lcp->index & MP_BAD) == 0) {
sc->sc_active = lcp;
break;
}
}
if (sc->sc_active == NULL) {
printf("GEOM_MULTIPATH: out of providers for %s\n",
sc->sc_name);
} else if (!sc->sc_active_active) {
printf("GEOM_MULTIPATH: %s is now active path in %s\n",
sc->sc_active->provider->name, sc->sc_name);
}
}
static struct g_consumer *
g_multipath_choose(struct g_geom *gp)
{
struct g_multipath_softc *sc;
struct g_consumer *best, *cp;
sc = gp->softc;
if (!sc->sc_active_active)
return (sc->sc_active);
best = NULL;
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->index & MP_BAD)
continue;
cp->index += MP_IDLE;
if (best == NULL || cp->private < best->private ||
(cp->private == best->private && cp->index > best->index))
best = cp;
}
if (best != NULL)
best->index &= ~MP_IDLE_MASK;
return (best);
}
static void
g_mpd(void *arg, int flags __unused)
{
struct g_geom *gp;
struct g_multipath_softc *sc;
struct g_consumer *cp;
int w;
g_topology_assert();
cp = arg;
gp = cp->geom;
if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) {
w = cp->acw;
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
if (w > 0 && cp->provider != NULL &&
(cp->provider->geom->flags & G_GEOM_WITHER) == 0) {
g_post_event(g_mpd, cp, M_WAITOK, NULL);
return;
}
}
sc = gp->softc;
mtx_lock(&sc->sc_mtx);
if (cp->provider) {
printf("GEOM_MULTIPATH: %s removed from %s\n",
cp->provider->name, gp->name);
g_detach(cp);
}
g_destroy_consumer(cp);
mtx_unlock(&sc->sc_mtx);
if (LIST_EMPTY(&gp->consumer))
g_multipath_destroy(gp);
}
static void
g_multipath_orphan(struct g_consumer *cp)
{
struct g_multipath_softc *sc;
uintptr_t *cnt;
g_topology_assert();
printf("GEOM_MULTIPATH: %s in %s was disconnected\n",
cp->provider->name, cp->geom->name);
sc = cp->geom->softc;
cnt = (uintptr_t *)&cp->private;
mtx_lock(&sc->sc_mtx);
sc->sc_ndisks--;
g_multipath_fault(cp, MP_LOST);
if (*cnt == 0 && (cp->index & MP_POSTED) == 0) {
cp->index |= MP_POSTED;
mtx_unlock(&sc->sc_mtx);
g_mpd(cp, 0);
} else
mtx_unlock(&sc->sc_mtx);
}
static void
g_multipath_start(struct bio *bp)
{
struct g_multipath_softc *sc;
struct g_geom *gp;
struct g_consumer *cp;
struct bio *cbp;
uintptr_t *cnt;
gp = bp->bio_to->geom;
sc = gp->softc;
KASSERT(sc != NULL, ("NULL sc"));
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
mtx_lock(&sc->sc_mtx);
cp = g_multipath_choose(gp);
if (cp == NULL) {
mtx_unlock(&sc->sc_mtx);
g_destroy_bio(cbp);
g_io_deliver(bp, ENXIO);
return;
}
if ((uintptr_t)bp->bio_driver1 < sc->sc_ndisks)
bp->bio_driver1 = (void *)(uintptr_t)sc->sc_ndisks;
cnt = (uintptr_t *)&cp->private;
(*cnt)++;
mtx_unlock(&sc->sc_mtx);
cbp->bio_done = g_multipath_done;
g_io_request(cbp, cp);
}
static void
g_multipath_done(struct bio *bp)
{
struct g_multipath_softc *sc;
struct g_consumer *cp;
uintptr_t *cnt;
if (bp->bio_error == ENXIO || bp->bio_error == EIO) {
mtx_lock(&gmtbq_mtx);
bioq_insert_tail(&gmtbq, bp);
mtx_unlock(&gmtbq_mtx);
wakeup(&g_multipath_kt_state);
} else {
cp = bp->bio_from;
sc = cp->geom->softc;
cnt = (uintptr_t *)&cp->private;
mtx_lock(&sc->sc_mtx);
(*cnt)--;
if (*cnt == 0 && (cp->index & MP_LOST)) {
cp->index |= MP_POSTED;
mtx_unlock(&sc->sc_mtx);
g_post_event(g_mpd, cp, M_WAITOK, NULL);
} else
mtx_unlock(&sc->sc_mtx);
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;
uintptr_t *cnt;
/*
* 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.
*/
pbp = bp->bio_parent;
gp = pbp->bio_to->geom;
sc = gp->softc;
cp = bp->bio_from;
pp = cp->provider;
cnt = (uintptr_t *)&cp->private;
mtx_lock(&sc->sc_mtx);
printf("GEOM_MULTIPATH: Error %d, %s in %s marked FAIL\n",
bp->bio_error, pp->name, sc->sc_name);
g_multipath_fault(cp, MP_FAIL);
(*cnt)--;
if (*cnt == 0 && (cp->index & (MP_LOST | MP_POSTED)) == MP_LOST) {
cp->index |= MP_POSTED;
mtx_unlock(&sc->sc_mtx);
g_post_event(g_mpd, cp, M_WAITOK, NULL);
} else
mtx_unlock(&sc->sc_mtx);
/*
* If we can fruitfully restart the I/O, do so.
*/
if (pbp->bio_children < (uintptr_t)pbp->bio_driver1) {
pbp->bio_inbed++;
g_destroy_bio(bp);
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);
kproc_exit(0);
}
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;
struct g_multipath_softc *sc;
int error;
gp = pp->geom;
LIST_FOREACH(cp, &gp->consumer, consumer) {
error = g_access(cp, dr, dw, de);
if (error) {
badcp = cp;
goto fail;
}
}
sc = gp->softc;
sc->sc_opened += dr + dw + de;
if (sc->sc_stopping && sc->sc_opened == 0)
g_multipath_destroy(gp);
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) {
sc = gp->softc;
if (sc == NULL || sc->sc_stopping)
continue;
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);
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
mtx_init(&sc->sc_mtx, "multipath", NULL, MTX_DEF);
memcpy(sc->sc_uuid, md->md_uuid, sizeof (sc->sc_uuid));
memcpy(sc->sc_name, md->md_name, sizeof (sc->sc_name));
sc->sc_active_active = md->md_active_active;
gp->softc = sc;
gp->start = g_multipath_start;
gp->orphan = g_multipath_orphan;
gp->access = g_multipath_access;
gp->dumpconf = g_multipath_dumpconf;
pp = g_new_providerf(gp, "multipath/%s", md->md_name);
if (md->md_size != 0) {
pp->mediasize = md->md_size -
((md->md_uuid[0] != 0) ? md->md_sectorsize : 0);
pp->sectorsize = md->md_sectorsize;
}
sc->sc_pp = pp;
g_error_provider(pp, 0);
printf("GEOM_MULTIPATH: %s created\n", gp->name);
return (gp);
}
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, acr, acw, ace;
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);
cp->private = NULL;
cp->index = MP_NEW;
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);
}
/*
* Set access permissions on new consumer to match other consumers
*/
if (sc->sc_pp) {
acr = sc->sc_pp->acr;
acw = sc->sc_pp->acw;
ace = sc->sc_pp->ace;
} else
acr = acw = ace = 0;
if (g_multipath_exclusive) {
acr++;
acw++;
ace++;
}
error = g_access(cp, acr, acw, ace);
if (error) {
printf("GEOM_MULTIPATH: cannot set access in "
"attaching %s to %s (%d)\n",
pp->name, sc->sc_name, error);
g_detach(cp);
g_destroy_consumer(cp);
return (error);
}
if (sc->sc_pp != NULL && sc->sc_pp->mediasize == 0) {
sc->sc_pp->mediasize = pp->mediasize -
((sc->sc_uuid[0] != 0) ? pp->sectorsize : 0);
sc->sc_pp->sectorsize = pp->sectorsize;
}
if (sc->sc_pp != NULL &&
sc->sc_pp->stripesize == 0 && sc->sc_pp->stripeoffset == 0) {
sc->sc_pp->stripesize = pp->stripesize;
sc->sc_pp->stripeoffset = pp->stripeoffset;
}
mtx_lock(&sc->sc_mtx);
cp->index = 0;
sc->sc_ndisks++;
mtx_unlock(&sc->sc_mtx);
printf("GEOM_MULTIPATH: %s added to %s\n",
pp->name, sc->sc_name);
if (sc->sc_active == NULL) {
sc->sc_active = cp;
if (!sc->sc_active_active)
printf("GEOM_MULTIPATH: %s is now active path in %s\n",
pp->name, sc->sc_name);
}
return (0);
}
static int
g_multipath_destroy(struct g_geom *gp)
{
struct g_multipath_softc *sc;
struct g_consumer *cp, *cp1;
g_topology_assert();
if (gp->softc == NULL)
return (ENXIO);
sc = gp->softc;
if (!sc->sc_stopping) {
printf("GEOM_MULTIPATH: destroying %s\n", gp->name);
sc->sc_stopping = 1;
}
if (sc->sc_opened != 0) {
if (sc->sc_pp != NULL) {
g_wither_provider(sc->sc_pp, ENXIO);
sc->sc_pp = NULL;
}
return (EINPROGRESS);
}
LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) {
mtx_lock(&sc->sc_mtx);
if ((cp->index & MP_POSTED) == 0) {
cp->index |= MP_POSTED;
mtx_unlock(&sc->sc_mtx);
g_mpd(cp, 0);
if (cp1 == NULL)
return(0); /* Recursion happened. */
} else
mtx_unlock(&sc->sc_mtx);
}
if (!LIST_EMPTY(&gp->consumer))
return (EINPROGRESS);
mtx_destroy(&sc->sc_mtx);
g_free(gp->softc);
gp->softc = NULL;
printf("GEOM_MULTIPATH: %s destroyed\n", gp->name);
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 int
g_multipath_rotate(struct g_geom *gp)
{
struct g_consumer *lcp;
struct g_multipath_softc *sc = gp->softc;
g_topology_assert();
if (sc == NULL)
return (ENXIO);
LIST_FOREACH(lcp, &gp->consumer, consumer) {
if ((lcp->index & MP_BAD) == 0) {
if (sc->sc_active != lcp)
break;
}
}
if (lcp) {
sc->sc_active = lcp;
if (!sc->sc_active_active)
printf("GEOM_MULTIPATH: %s is now active path in %s\n",
lcp->provider->name, sc->sc_name);
}
return (0);
}
static void
g_multipath_init(struct g_class *mp)
{
bioq_init(&gmtbq);
mtx_init(&gmtbq_mtx, "gmtbq", NULL, MTX_DEF);
if (kproc_create(g_multipath_kt, mp, NULL, 0, 0, "g_mp_kt") == 0)
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 (md.md_size != 0 && md.md_size != pp->mediasize)
return (NULL);
if (md.md_sectorsize != 0 && md.md_sectorsize != pp->sectorsize)
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 || sc->sc_stopping)
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 || sc->sc_stopping)
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_add_name(struct gctl_req *req, struct g_class *mp,
const char *name)
{
struct g_multipath_softc *sc;
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp;
const char *mpname;
static const char devpf[6] = "/dev/";
g_topology_assert();
mpname = gctl_get_asciiparam(req, "arg0");
if (mpname == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
gp = g_multipath_find_geom(mp, mpname);
if (gp == NULL) {
gctl_error(req, "Device %s is invalid", mpname);
return;
}
sc = gp->softc;
if (strncmp(name, devpf, 5) == 0)
name += 5;
pp = g_provider_by_name(name);
if (pp == NULL) {
gctl_error(req, "Provider %s is invalid", name);
return;
}
/*
* Check to make sure parameters match.
*/
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->provider == pp) {
gctl_error(req, "provider %s is already there",
pp->name);
return;
}
}
if (sc->sc_pp != NULL && sc->sc_pp->mediasize != 0 &&
sc->sc_pp->mediasize + (sc->sc_uuid[0] != 0 ? pp->sectorsize : 0)
!= pp->mediasize) {
gctl_error(req, "Providers size mismatch %jd != %jd",
(intmax_t) sc->sc_pp->mediasize +
(sc->sc_uuid[0] != 0 ? pp->sectorsize : 0),
(intmax_t) pp->mediasize);
return;
}
if (sc->sc_pp != NULL && sc->sc_pp->sectorsize != 0 &&
sc->sc_pp->sectorsize != pp->sectorsize) {
gctl_error(req, "Providers sectorsize mismatch %u != %u",
sc->sc_pp->sectorsize, pp->sectorsize);
return;
}
/*
* Now add....
*/
(void) g_multipath_add_disk(gp, pp);
}
static void
g_multipath_ctl_add(struct gctl_req *req, struct g_class *mp)
{
struct g_multipath_softc *sc;
struct g_geom *gp;
const char *mpname, *name;
mpname = gctl_get_asciiparam(req, "arg0");
if (mpname == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
gp = g_multipath_find_geom(mp, mpname);
if (gp == NULL) {
gctl_error(req, "Device %s not found", mpname);
return;
}
sc = gp->softc;
name = gctl_get_asciiparam(req, "arg1");
if (name == NULL) {
gctl_error(req, "No 'arg1' argument");
return;
}
g_multipath_ctl_add_name(req, mp, name);
}
static void
g_multipath_ctl_create(struct gctl_req *req, struct g_class *mp)
{
struct g_multipath_metadata md;
struct g_multipath_softc *sc;
struct g_geom *gp;
const char *mpname, *name;
char param[16];
int *nargs, i, *active_active;
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (*nargs < 2) {
gctl_error(req, "wrong number of arguments.");
return;
}
mpname = gctl_get_asciiparam(req, "arg0");
if (mpname == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
gp = g_multipath_find_geom(mp, mpname);
if (gp != NULL) {
gctl_error(req, "Device %s already exist", mpname);
return;
}
sc = gp->softc;
memset(&md, 0, sizeof(md));
strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic));
md.md_version = G_MULTIPATH_VERSION;
strlcpy(md.md_name, mpname, sizeof(md.md_name));
md.md_size = 0;
md.md_sectorsize = 0;
md.md_uuid[0] = 0;
active_active = gctl_get_paraml(req, "active_active",
sizeof(*active_active));
md.md_active_active =
(active_active == NULL || *active_active == 0) ? 0 : 1;
gp = g_multipath_create(mp, &md);
if (gp == NULL) {
gctl_error(req, "GEOM_MULTIPATH: cannot create geom %s/%s\n",
md.md_name, md.md_uuid);
return;
}
sc = gp->softc;
for (i = 1; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
g_multipath_ctl_add_name(req, mp, name);
}
if (sc->sc_ndisks != (*nargs - 1))
g_multipath_destroy(gp);
}
static void
g_multipath_ctl_fail(struct gctl_req *req, struct g_class *mp, int fail)
{
struct g_multipath_softc *sc;
struct g_geom *gp;
struct g_consumer *cp;
const char *mpname, *name;
int found;
mpname = gctl_get_asciiparam(req, "arg0");
if (mpname == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
gp = g_multipath_find_geom(mp, mpname);
if (gp == NULL) {
gctl_error(req, "Device %s not found", mpname);
return;
}
sc = gp->softc;
name = gctl_get_asciiparam(req, "arg1");
if (name == NULL) {
gctl_error(req, "No 'arg1' argument");
return;
}
found = 0;
mtx_lock(&sc->sc_mtx);
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->provider != NULL &&
strcmp(cp->provider->name, name) == 0 &&
(cp->index & MP_LOST) == 0) {
found = 1;
printf("GEOM_MULTIPATH: %s in %s is marked %s.\n",
name, sc->sc_name, fail ? "FAIL" : "OK");
if (fail) {
g_multipath_fault(cp, MP_FAIL);
} else {
cp->index &= ~MP_FAIL;
}
}
}
mtx_unlock(&sc->sc_mtx);
if (found == 0)
gctl_error(req, "Provider %s not found", name);
}
static void
g_multipath_ctl_remove(struct gctl_req *req, struct g_class *mp)
{
struct g_multipath_softc *sc;
struct g_geom *gp;
struct g_consumer *cp, *cp1;
const char *mpname, *name;
uintptr_t *cnt;
int found;
mpname = gctl_get_asciiparam(req, "arg0");
if (mpname == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
gp = g_multipath_find_geom(mp, mpname);
if (gp == NULL) {
gctl_error(req, "Device %s not found", mpname);
return;
}
sc = gp->softc;
name = gctl_get_asciiparam(req, "arg1");
if (name == NULL) {
gctl_error(req, "No 'arg1' argument");
return;
}
found = 0;
mtx_lock(&sc->sc_mtx);
LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) {
if (cp->provider != NULL &&
strcmp(cp->provider->name, name) == 0 &&
(cp->index & MP_LOST) == 0) {
found = 1;
printf("GEOM_MULTIPATH: removing %s from %s\n",
cp->provider->name, cp->geom->name);
sc->sc_ndisks--;
g_multipath_fault(cp, MP_LOST);
cnt = (uintptr_t *)&cp->private;
if (*cnt == 0 && (cp->index & MP_POSTED) == 0) {
cp->index |= MP_POSTED;
mtx_unlock(&sc->sc_mtx);
g_mpd(cp, 0);
if (cp1 == NULL)
return; /* Recursion happened. */
mtx_lock(&sc->sc_mtx);
}
}
}
mtx_unlock(&sc->sc_mtx);
if (found == 0)
gctl_error(req, "Provider %s not found", name);
}
static struct g_geom *
g_multipath_find_geom(struct g_class *mp, const char *name)
{
struct g_geom *gp;
struct g_multipath_softc *sc;
LIST_FOREACH(gp, &mp->geom, geom) {
sc = gp->softc;
if (sc == NULL || sc->sc_stopping)
continue;
if (strcmp(gp->name, name) == 0)
return (gp);
}
return (NULL);
}
static void
g_multipath_ctl_stop(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 && error != EINPROGRESS)
gctl_error(req, "failed to stop %s (err=%d)", name, error);
}
static void
g_multipath_ctl_destroy(struct gctl_req *req, struct g_class *mp)
{
struct g_geom *gp;
struct g_multipath_softc *sc;
struct g_consumer *cp;
struct g_provider *pp;
const char *name;
uint8_t *buf;
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;
}
sc = gp->softc;
if (sc->sc_uuid[0] != 0 && sc->sc_active != NULL) {
cp = sc->sc_active;
pp = cp->provider;
error = g_access(cp, 1, 1, 1);
if (error != 0) {
gctl_error(req, "Can't open %s (%d)", pp->name, error);
goto destroy;
}
g_topology_unlock();
buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
error = g_write_data(cp, pp->mediasize - pp->sectorsize,
buf, pp->sectorsize);
g_topology_lock();
g_access(cp, -1, -1, -1);
if (error != 0)
gctl_error(req, "Can't erase metadata on %s (%d)",
pp->name, error);
}
destroy:
error = g_multipath_destroy(gp);
if (error != 0 && error != EINPROGRESS)
gctl_error(req, "failed to destroy %s (err=%d)", name, error);
}
static void
g_multipath_ctl_rotate(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_rotate(gp);
if (error != 0) {
gctl_error(req, "failed to rotate %s (err=%d)", name, error);
}
}
static void
g_multipath_ctl_getactive(struct gctl_req *req, struct g_class *mp)
{
struct sbuf *sb;
struct g_geom *gp;
struct g_multipath_softc *sc;
struct g_consumer *cp;
const char *name;
int empty;
sb = sbuf_new_auto();
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;
}
sc = gp->softc;
if (sc->sc_active_active) {
empty = 1;
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->index & MP_BAD)
continue;
if (!empty)
sbuf_cat(sb, " ");
sbuf_cat(sb, cp->provider->name);
empty = 0;
}
if (empty)
sbuf_cat(sb, "none");
sbuf_cat(sb, "\n");
} else if (sc->sc_active && sc->sc_active->provider) {
sbuf_printf(sb, "%s\n", sc->sc_active->provider->name);
} else {
sbuf_printf(sb, "none\n");
}
sbuf_finish(sb);
gctl_set_param_err(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
sbuf_delete(sb);
}
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, "add") == 0) {
g_multipath_ctl_add(req, mp);
} else if (strcmp(verb, "create") == 0) {
g_multipath_ctl_create(req, mp);
} else if (strcmp(verb, "stop") == 0) {
g_multipath_ctl_stop(req, mp);
} else if (strcmp(verb, "destroy") == 0) {
g_multipath_ctl_destroy(req, mp);
} else if (strcmp(verb, "fail") == 0) {
g_multipath_ctl_fail(req, mp, 1);
} else if (strcmp(verb, "restore") == 0) {
g_multipath_ctl_fail(req, mp, 0);
} else if (strcmp(verb, "remove") == 0) {
g_multipath_ctl_remove(req, mp);
} else if (strcmp(verb, "rotate") == 0) {
g_multipath_ctl_rotate(req, mp);
} else if (strcmp(verb, "getactive") == 0) {
g_multipath_ctl_getactive(req, mp);
} else {
gctl_error(req, "Unknown verb %s", verb);
}
}
static void
g_multipath_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp, struct g_provider *pp)
{
struct g_multipath_softc *sc;
int good;
g_topology_assert();
sc = gp->softc;
if (sc == NULL)
return;
if (cp != NULL) {
sbuf_printf(sb, "%s<State>%s</State>", indent,
(cp->index & MP_NEW) ? "NEW" :
(cp->index & MP_LOST) ? "LOST" :
(cp->index & MP_FAIL) ? "FAIL" :
(sc->sc_active_active || sc->sc_active == cp) ?
"ACTIVE" : "PASSIVE");
} else {
good = g_multipath_good(gp);
sbuf_printf(sb, "%s<State>%s</State>", indent,
good == 0 ? "BROKEN" :
(good != sc->sc_ndisks || sc->sc_ndisks == 1) ?
"DEGRADED" : "OPTIMAL");
}
if (cp == NULL && pp == NULL) {
sbuf_printf(sb, "%s<UUID>%s</UUID>", indent, sc->sc_uuid);
sbuf_printf(sb, "%s<Mode>Active/%s</Mode>", indent,
sc->sc_active_active ? "Active" : "Passive");
sbuf_printf(sb, "%s<Type>%s</Type>", indent,
sc->sc_uuid[0] == 0 ? "MANUAL" : "AUTOMATIC");
}
}
DECLARE_GEOM_CLASS(g_multipath_class, g_multipath);
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