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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/dtrace/fbt/@/geom/gate/g_gate.c |
/*-
* Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* Copyright (c) 2009-2010 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Pawel Jakub Dawidek
* under sponsorship from the FreeBSD Foundation.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/geom/gate/g_gate.c 223921 2011-07-11 05:22:31Z ae $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/fcntl.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/limits.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/signalvar.h>
#include <sys/time.h>
#include <machine/atomic.h>
#include <geom/geom.h>
#include <geom/gate/g_gate.h>
FEATURE(geom_gate, "GEOM Gate module");
static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data");
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, "GEOM_GATE stuff");
static int g_gate_debug = 0;
TUNABLE_INT("kern.geom.gate.debug", &g_gate_debug);
SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0,
"Debug level");
static u_int g_gate_maxunits = 256;
TUNABLE_INT("kern.geom.gate.maxunits", &g_gate_maxunits);
SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN,
&g_gate_maxunits, 0, "Maximum number of ggate devices");
struct g_class g_gate_class = {
.name = G_GATE_CLASS_NAME,
.version = G_VERSION,
};
static struct cdev *status_dev;
static d_ioctl_t g_gate_ioctl;
static struct cdevsw g_gate_cdevsw = {
.d_version = D_VERSION,
.d_ioctl = g_gate_ioctl,
.d_name = G_GATE_CTL_NAME
};
static struct g_gate_softc **g_gate_units;
static u_int g_gate_nunits;
static struct mtx g_gate_units_lock;
static int
g_gate_destroy(struct g_gate_softc *sc, boolean_t force)
{
struct g_provider *pp;
struct g_geom *gp;
struct bio *bp;
g_topology_assert();
mtx_assert(&g_gate_units_lock, MA_OWNED);
pp = sc->sc_provider;
if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
mtx_unlock(&g_gate_units_lock);
return (EBUSY);
}
mtx_unlock(&g_gate_units_lock);
mtx_lock(&sc->sc_queue_mtx);
if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0)
sc->sc_flags |= G_GATE_FLAG_DESTROY;
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
gp = pp->geom;
pp->flags |= G_PF_WITHER;
g_orphan_provider(pp, ENXIO);
callout_drain(&sc->sc_callout);
mtx_lock(&sc->sc_queue_mtx);
while ((bp = bioq_first(&sc->sc_inqueue)) != NULL) {
bioq_remove(&sc->sc_inqueue, bp);
sc->sc_queue_count--;
G_GATE_LOGREQ(1, bp, "Request canceled.");
g_io_deliver(bp, ENXIO);
}
while ((bp = bioq_first(&sc->sc_outqueue)) != NULL) {
bioq_remove(&sc->sc_outqueue, bp);
sc->sc_queue_count--;
G_GATE_LOGREQ(1, bp, "Request canceled.");
g_io_deliver(bp, ENXIO);
}
mtx_unlock(&sc->sc_queue_mtx);
g_topology_unlock();
mtx_lock(&g_gate_units_lock);
/* One reference is ours. */
sc->sc_ref--;
while (sc->sc_ref > 0)
msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0);
g_gate_units[sc->sc_unit] = NULL;
KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?"));
g_gate_nunits--;
mtx_unlock(&g_gate_units_lock);
mtx_destroy(&sc->sc_queue_mtx);
g_topology_lock();
G_GATE_DEBUG(1, "Device %s destroyed.", gp->name);
gp->softc = NULL;
g_wither_geom(gp, ENXIO);
sc->sc_provider = NULL;
free(sc, M_GATE);
return (0);
}
static int
g_gate_access(struct g_provider *pp, int dr, int dw, int de)
{
struct g_gate_softc *sc;
if (dr <= 0 && dw <= 0 && de <= 0)
return (0);
sc = pp->geom->softc;
if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0)
return (ENXIO);
/* XXX: Hack to allow read-only mounts. */
#if 0
if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0)
return (EPERM);
#endif
if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0)
return (EPERM);
return (0);
}
static void
g_gate_start(struct bio *bp)
{
struct g_gate_softc *sc;
sc = bp->bio_to->geom->softc;
if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) {
g_io_deliver(bp, ENXIO);
return;
}
G_GATE_LOGREQ(2, bp, "Request received.");
switch (bp->bio_cmd) {
case BIO_READ:
break;
case BIO_DELETE:
case BIO_WRITE:
case BIO_FLUSH:
/* XXX: Hack to allow read-only mounts. */
if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) {
g_io_deliver(bp, EPERM);
return;
}
break;
case BIO_GETATTR:
default:
G_GATE_LOGREQ(2, bp, "Ignoring request.");
g_io_deliver(bp, EOPNOTSUPP);
return;
}
mtx_lock(&sc->sc_queue_mtx);
if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) {
mtx_unlock(&sc->sc_queue_mtx);
G_GATE_LOGREQ(1, bp, "Queue full, request canceled.");
g_io_deliver(bp, ENOMEM);
return;
}
bp->bio_driver1 = (void *)sc->sc_seq;
sc->sc_seq++;
sc->sc_queue_count++;
bioq_insert_tail(&sc->sc_inqueue, bp);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
}
static struct g_gate_softc *
g_gate_hold(int unit, const char *name)
{
struct g_gate_softc *sc = NULL;
mtx_lock(&g_gate_units_lock);
if (unit >= 0 && unit < g_gate_maxunits)
sc = g_gate_units[unit];
else if (unit == G_GATE_NAME_GIVEN) {
KASSERT(name != NULL, ("name is NULL"));
for (unit = 0; unit < g_gate_maxunits; unit++) {
if (g_gate_units[unit] == NULL)
continue;
if (strcmp(name,
g_gate_units[unit]->sc_provider->name) != 0) {
continue;
}
sc = g_gate_units[unit];
break;
}
}
if (sc != NULL)
sc->sc_ref++;
mtx_unlock(&g_gate_units_lock);
return (sc);
}
static void
g_gate_release(struct g_gate_softc *sc)
{
g_topology_assert_not();
mtx_lock(&g_gate_units_lock);
sc->sc_ref--;
KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name));
if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0)
wakeup(&sc->sc_ref);
mtx_unlock(&g_gate_units_lock);
}
static int
g_gate_getunit(int unit, int *errorp)
{
mtx_assert(&g_gate_units_lock, MA_OWNED);
if (unit >= 0) {
if (unit >= g_gate_maxunits)
*errorp = EINVAL;
else if (g_gate_units[unit] == NULL)
return (unit);
else
*errorp = EEXIST;
} else {
for (unit = 0; unit < g_gate_maxunits; unit++) {
if (g_gate_units[unit] == NULL)
return (unit);
}
*errorp = ENFILE;
}
return (-1);
}
static void
g_gate_guard(void *arg)
{
struct g_gate_softc *sc;
struct bintime curtime;
struct bio *bp, *bp2;
sc = arg;
binuptime(&curtime);
g_gate_hold(sc->sc_unit, NULL);
mtx_lock(&sc->sc_queue_mtx);
TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) {
if (curtime.sec - bp->bio_t0.sec < 5)
continue;
bioq_remove(&sc->sc_inqueue, bp);
sc->sc_queue_count--;
G_GATE_LOGREQ(1, bp, "Request timeout.");
g_io_deliver(bp, EIO);
}
TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) {
if (curtime.sec - bp->bio_t0.sec < 5)
continue;
bioq_remove(&sc->sc_outqueue, bp);
sc->sc_queue_count--;
G_GATE_LOGREQ(1, bp, "Request timeout.");
g_io_deliver(bp, EIO);
}
mtx_unlock(&sc->sc_queue_mtx);
if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) {
callout_reset(&sc->sc_callout, sc->sc_timeout * hz,
g_gate_guard, sc);
}
g_gate_release(sc);
}
static void
g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp, struct g_provider *pp)
{
struct g_gate_softc *sc;
sc = gp->softc;
if (sc == NULL || pp != NULL || cp != NULL)
return;
g_gate_hold(sc->sc_unit, NULL);
if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) {
sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only");
} else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) {
sbuf_printf(sb, "%s<access>%s</access>\n", indent,
"write-only");
} else {
sbuf_printf(sb, "%s<access>%s</access>\n", indent,
"read-write");
}
sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout);
sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info);
sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent,
sc->sc_queue_count);
sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent,
sc->sc_queue_size);
sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref);
sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit);
g_topology_unlock();
g_gate_release(sc);
g_topology_lock();
}
static int
g_gate_create(struct g_gate_ctl_create *ggio)
{
struct g_gate_softc *sc;
struct g_geom *gp;
struct g_provider *pp;
char name[NAME_MAX];
int error = 0, unit;
if (ggio->gctl_mediasize == 0) {
G_GATE_DEBUG(1, "Invalid media size.");
return (EINVAL);
}
if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) {
G_GATE_DEBUG(1, "Invalid sector size.");
return (EINVAL);
}
if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) {
G_GATE_DEBUG(1, "Invalid media size.");
return (EINVAL);
}
if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 &&
(ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) {
G_GATE_DEBUG(1, "Invalid flags.");
return (EINVAL);
}
if (ggio->gctl_unit != G_GATE_UNIT_AUTO &&
ggio->gctl_unit != G_GATE_NAME_GIVEN &&
ggio->gctl_unit < 0) {
G_GATE_DEBUG(1, "Invalid unit number.");
return (EINVAL);
}
if (ggio->gctl_unit == G_GATE_NAME_GIVEN &&
ggio->gctl_name[0] == '\0') {
G_GATE_DEBUG(1, "No device name.");
return (EINVAL);
}
sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO);
sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS);
strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info));
sc->sc_seq = 1;
bioq_init(&sc->sc_inqueue);
bioq_init(&sc->sc_outqueue);
mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF);
sc->sc_queue_count = 0;
sc->sc_queue_size = ggio->gctl_maxcount;
if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE)
sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE;
sc->sc_timeout = ggio->gctl_timeout;
callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
mtx_lock(&g_gate_units_lock);
sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error);
if (sc->sc_unit < 0) {
mtx_unlock(&g_gate_units_lock);
mtx_destroy(&sc->sc_queue_mtx);
free(sc, M_GATE);
return (error);
}
if (ggio->gctl_unit == G_GATE_NAME_GIVEN)
snprintf(name, sizeof(name), "%s", ggio->gctl_name);
else {
snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME,
sc->sc_unit);
}
/* Check for name collision. */
for (unit = 0; unit < g_gate_maxunits; unit++) {
if (g_gate_units[unit] == NULL)
continue;
if (strcmp(name, g_gate_units[unit]->sc_name) != 0)
continue;
mtx_unlock(&g_gate_units_lock);
mtx_destroy(&sc->sc_queue_mtx);
free(sc, M_GATE);
return (EEXIST);
}
sc->sc_name = name;
g_gate_units[sc->sc_unit] = sc;
g_gate_nunits++;
mtx_unlock(&g_gate_units_lock);
ggio->gctl_unit = sc->sc_unit;
g_topology_lock();
gp = g_new_geomf(&g_gate_class, "%s", name);
gp->start = g_gate_start;
gp->access = g_gate_access;
gp->dumpconf = g_gate_dumpconf;
gp->softc = sc;
pp = g_new_providerf(gp, "%s", name);
pp->mediasize = ggio->gctl_mediasize;
pp->sectorsize = ggio->gctl_sectorsize;
sc->sc_provider = pp;
g_error_provider(pp, 0);
g_topology_unlock();
mtx_lock(&g_gate_units_lock);
sc->sc_name = sc->sc_provider->name;
mtx_unlock(&g_gate_units_lock);
G_GATE_DEBUG(1, "Device %s created.", gp->name);
if (sc->sc_timeout > 0) {
callout_reset(&sc->sc_callout, sc->sc_timeout * hz,
g_gate_guard, sc);
}
return (0);
}
#define G_GATE_CHECK_VERSION(ggio) do { \
if ((ggio)->gctl_version != G_GATE_VERSION) { \
printf("Version mismatch %d != %d.\n", \
ggio->gctl_version, G_GATE_VERSION); \
return (EINVAL); \
} \
} while (0)
static int
g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
{
struct g_gate_softc *sc;
struct bio *bp;
int error = 0;
G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr,
flags, td);
switch (cmd) {
case G_GATE_CMD_CREATE:
{
struct g_gate_ctl_create *ggio = (void *)addr;
G_GATE_CHECK_VERSION(ggio);
error = g_gate_create(ggio);
/*
* Reset TDP_GEOM flag.
* There are pending events for sure, because we just created
* new provider and other classes want to taste it, but we
* cannot answer on I/O requests until we're here.
*/
td->td_pflags &= ~TDP_GEOM;
return (error);
}
case G_GATE_CMD_DESTROY:
{
struct g_gate_ctl_destroy *ggio = (void *)addr;
G_GATE_CHECK_VERSION(ggio);
sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name);
if (sc == NULL)
return (ENXIO);
g_topology_lock();
mtx_lock(&g_gate_units_lock);
error = g_gate_destroy(sc, ggio->gctl_force);
g_topology_unlock();
if (error != 0)
g_gate_release(sc);
return (error);
}
case G_GATE_CMD_CANCEL:
{
struct g_gate_ctl_cancel *ggio = (void *)addr;
struct bio *tbp, *lbp;
G_GATE_CHECK_VERSION(ggio);
sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name);
if (sc == NULL)
return (ENXIO);
lbp = NULL;
mtx_lock(&sc->sc_queue_mtx);
TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) {
if (ggio->gctl_seq == 0 ||
ggio->gctl_seq == (uintptr_t)bp->bio_driver1) {
G_GATE_LOGREQ(1, bp, "Request canceled.");
bioq_remove(&sc->sc_outqueue, bp);
/*
* Be sure to put requests back onto incoming
* queue in the proper order.
*/
if (lbp == NULL)
bioq_insert_head(&sc->sc_inqueue, bp);
else {
TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue,
lbp, bp, bio_queue);
}
lbp = bp;
/*
* If only one request was canceled, leave now.
*/
if (ggio->gctl_seq != 0)
break;
}
}
if (ggio->gctl_unit == G_GATE_NAME_GIVEN)
ggio->gctl_unit = sc->sc_unit;
mtx_unlock(&sc->sc_queue_mtx);
g_gate_release(sc);
return (error);
}
case G_GATE_CMD_START:
{
struct g_gate_ctl_io *ggio = (void *)addr;
G_GATE_CHECK_VERSION(ggio);
sc = g_gate_hold(ggio->gctl_unit, NULL);
if (sc == NULL)
return (ENXIO);
error = 0;
for (;;) {
mtx_lock(&sc->sc_queue_mtx);
bp = bioq_first(&sc->sc_inqueue);
if (bp != NULL)
break;
if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) {
ggio->gctl_error = ECANCELED;
mtx_unlock(&sc->sc_queue_mtx);
goto start_end;
}
if (msleep(sc, &sc->sc_queue_mtx,
PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) {
ggio->gctl_error = ECANCELED;
goto start_end;
}
}
ggio->gctl_cmd = bp->bio_cmd;
if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) &&
bp->bio_length > ggio->gctl_length) {
mtx_unlock(&sc->sc_queue_mtx);
ggio->gctl_length = bp->bio_length;
ggio->gctl_error = ENOMEM;
goto start_end;
}
bioq_remove(&sc->sc_inqueue, bp);
bioq_insert_tail(&sc->sc_outqueue, bp);
mtx_unlock(&sc->sc_queue_mtx);
ggio->gctl_seq = (uintptr_t)bp->bio_driver1;
ggio->gctl_offset = bp->bio_offset;
ggio->gctl_length = bp->bio_length;
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_DELETE:
case BIO_FLUSH:
break;
case BIO_WRITE:
error = copyout(bp->bio_data, ggio->gctl_data,
bp->bio_length);
if (error != 0) {
mtx_lock(&sc->sc_queue_mtx);
bioq_remove(&sc->sc_outqueue, bp);
bioq_insert_head(&sc->sc_inqueue, bp);
mtx_unlock(&sc->sc_queue_mtx);
goto start_end;
}
break;
}
start_end:
g_gate_release(sc);
return (error);
}
case G_GATE_CMD_DONE:
{
struct g_gate_ctl_io *ggio = (void *)addr;
G_GATE_CHECK_VERSION(ggio);
sc = g_gate_hold(ggio->gctl_unit, NULL);
if (sc == NULL)
return (ENOENT);
error = 0;
mtx_lock(&sc->sc_queue_mtx);
TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) {
if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1)
break;
}
if (bp != NULL) {
bioq_remove(&sc->sc_outqueue, bp);
sc->sc_queue_count--;
}
mtx_unlock(&sc->sc_queue_mtx);
if (bp == NULL) {
/*
* Request was probably canceled.
*/
goto done_end;
}
if (ggio->gctl_error == EAGAIN) {
bp->bio_error = 0;
G_GATE_LOGREQ(1, bp, "Request desisted.");
mtx_lock(&sc->sc_queue_mtx);
sc->sc_queue_count++;
bioq_insert_head(&sc->sc_inqueue, bp);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
} else {
bp->bio_error = ggio->gctl_error;
if (bp->bio_error == 0) {
bp->bio_completed = bp->bio_length;
switch (bp->bio_cmd) {
case BIO_READ:
error = copyin(ggio->gctl_data,
bp->bio_data, bp->bio_length);
if (error != 0)
bp->bio_error = error;
break;
case BIO_DELETE:
case BIO_WRITE:
case BIO_FLUSH:
break;
}
}
G_GATE_LOGREQ(2, bp, "Request done.");
g_io_deliver(bp, bp->bio_error);
}
done_end:
g_gate_release(sc);
return (error);
}
}
return (ENOIOCTL);
}
static void
g_gate_device(void)
{
status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600,
G_GATE_CTL_NAME);
}
static int
g_gate_modevent(module_t mod, int type, void *data)
{
int error = 0;
switch (type) {
case MOD_LOAD:
mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF);
g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]),
M_GATE, M_WAITOK | M_ZERO);
g_gate_nunits = 0;
g_gate_device();
break;
case MOD_UNLOAD:
mtx_lock(&g_gate_units_lock);
if (g_gate_nunits > 0) {
mtx_unlock(&g_gate_units_lock);
error = EBUSY;
break;
}
mtx_unlock(&g_gate_units_lock);
mtx_destroy(&g_gate_units_lock);
if (status_dev != 0)
destroy_dev(status_dev);
free(g_gate_units, M_GATE);
break;
default:
return (EOPNOTSUPP);
break;
}
return (error);
}
static moduledata_t g_gate_module = {
G_GATE_MOD_NAME,
g_gate_modevent,
NULL
};
DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
DECLARE_GEOM_CLASS(g_gate_class, g_gate);