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7d0fb1f7ef
freebsd/sys/geom/vinum/geom_vinum.c
Ulf Lilleengen 7e11b694f4 - Fix a potential NULL pointer reference. Note that this cannot happen in 
practice, but it is a good programming practice nontheless and it allows the
  kernel to not depend on userland correctness.

Found with:   Coverity Prevent(tm)
CID:          655-659, 664-667
2008-11-25 19:13:58 +00:00

557 lines
13 KiB
C
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/*-
* 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/sysctl.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>
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, vinum, CTLFLAG_RW, 0, "GEOM_VINUM stuff");
u_int g_vinum_debug = 0;
TUNABLE_INT("kern.geom.vinum.debug", &g_vinum_debug);
SYSCTL_UINT(_kern_geom_vinum, OID_AUTO, debug, CTLFLAG_RW, &g_vinum_debug, 0,
"Debug level");
int gv_create(struct g_geom *, struct gctl_req *);
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);
if (bp2 == NULL)
g_io_deliver(bp, ENOMEM);
else {
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 void
gv_init(struct g_class *mp)
{
struct g_geom *gp;
struct gv_softc *sc;
g_trace(G_T_TOPOLOGY, "gv_init(%p)", mp);
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);
}
/* 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));
if (volumes == NULL || plexes == NULL || subdisks == NULL ||
drives == NULL) {
gctl_error(req, "number of objects not given");
return (-1);
}
/* 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));
if (d2 == NULL) {
gctl_error(req, "no drive definition given");
return (-1);
}
d = gv_find_drive(sc, d2->name);
if (d != NULL) {
gctl_error(req, "drive '%s' is already known",
d->name);
continue;
}
d = g_malloc(sizeof(*d), M_WAITOK | M_ZERO);
bcopy(d2, d, sizeof(*d));
/*
* Make sure that the provider specified in the drive
* specification is an active GEOM provider.
*/
pp = g_provider_by_name(d->device);
if (pp == NULL) {
gctl_error(req, "%s: drive not found", d->device);
g_free(d);
return (-1);
}
d->size = pp->mediasize - GV_DATA_START;
d->avail = d->size;
gv_config_new_drive(d);
d->flags |= GV_DRIVE_NEWBORN;
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));
if (v2 == NULL) {
gctl_error(req, "no volume definition given");
return (-1);
}
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));
if (p2 == NULL) {
gctl_error(req, "no plex definition given");
return (-1);
}
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) {
gctl_error(req, "volume '%s' not found", p->volume);
g_free(p);
continue;
}
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;
p->flags |= GV_PLEX_NEWBORN;
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));
if (s2 == NULL) {
gctl_error(req, "no subdisk definition given");
return (-1);
}
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) {
gctl_error(req, "drive '%s' not found", 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) {
gctl_error(req, "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) {
gctl_error(req, "GEOM_VINUM: couldn't give sd '%s' "
"to plex '%s'\n", s->name, p->name);
if (s->drive_sc)
LIST_REMOVE(s, from_drive);
gv_free_sd(s);
g_free(s);
/*
* If this subdisk can't be created, we won't create
* the attached plex either, if it is also a new one.
*/
if (!(p->flags & GV_PLEX_NEWBORN))
continue;
LIST_FOREACH_SAFE(s, &p->subdisks, in_plex, s2) {
if (s->drive_sc)
LIST_REMOVE(s, from_drive);
p->sdcount--;
LIST_REMOVE(s, in_plex);
LIST_REMOVE(s, sd);
gv_free_sd(s);
g_free(s);
}
if (p->vol_sc != NULL) {
LIST_REMOVE(p, in_volume);
p->vol_sc->plexcount--;
}
LIST_REMOVE(p, plex);
g_free(p);
continue;
}
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 if the provider disapears before we get a chance
* to write the config out to the drive, should this
* be handled any differently?
*/
pp = g_provider_by_name(d->device);
if (pp == NULL) {
G_VINUM_DEBUG(0, "%s: drive disappeared?",
d->device);
continue;
}
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);
d->flags &= ~GV_DRIVE_NEWBORN;
}
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);
if (comment == NULL) {
gctl_error(req, "no comment parameter given");
return;
}
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, "move")) {
gv_move(gp, req);
} else if (!strcmp(verb, "parityop")) {
gv_parityop(gp, req);
} else if (!strcmp(verb, "remove")) {
gv_remove(gp, req);
} else if (!strcmp(verb, "rename")) {
gv_rename(gp, req);
} else if (!strcmp(verb, "resetconfig")) {
gv_resetconfig(gp, req);
} else if (!strcmp(verb, "start")) {
gv_start_obj(gp, req);
} else if (!strcmp(verb, "setstate")) {
gv_setstate(gp, req);
} else
gctl_error(req, "Unknown verb parameter");
}
#if 0
static int
gv_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
{
struct g_geom *gp2;
struct g_consumer *cp;
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 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;
cp = LIST_FIRST(&gp2->consumer);
if (cp != NULL)
g_access(cp, -1, -1, -1);
if (gv_is_open(gp2))
return (EBUSY);
}
/* Clean up and deallocate what we allocated. */
LIST_FOREACH_SAFE(d, &sc->drives, drive, d2) {
LIST_REMOVE(d, drive);
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;
}
d->geom->softc = NULL;
g_free(d);
}
LIST_FOREACH_SAFE(s, &sc->subdisks, sd, s2) {
LIST_REMOVE(s, sd);
s->drive_sc = NULL;
s->plex_sc = NULL;
s->provider = NULL;
s->consumer = NULL;
g_free(s);
}
LIST_FOREACH_SAFE(p, &sc->plexes, plex, p2) {
LIST_REMOVE(p, plex);
gv_kill_thread(p);
p->vol_sc = NULL;
p->geom->softc = NULL;
p->provider = NULL;
p->consumer = NULL;
if (p->org == GV_PLEX_RAID5) {
mtx_destroy(&p->worklist_mtx);
}
g_free(p);
}
LIST_FOREACH_SAFE(v, &sc->volumes, volume, v2) {
LIST_REMOVE(v, volume);
v->geom->softc = NULL;
g_free(v);
}
gp->softc = NULL;
g_free(sc);
g_wither_geom(gp, ENXIO);
return (0);
}
#endif
#define VINUM_CLASS_NAME "VINUM"
static struct g_class g_vinum_class = {
.name = VINUM_CLASS_NAME,
.version = G_VERSION,
.init = gv_init,
/*.destroy_geom = gv_destroy_geom,*/
.ctlreq = gv_config,
};
DECLARE_GEOM_CLASS(g_vinum_class, g_vinum);
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