e35d3a7828
4 mutex operations per I/O requests. - Use only one mutex to protect both (incoming and outgoing) queue. As MUTEX_PROFILING(9) shows, there is no big contention for this lock. - Protect sc_queue_count with queue mutex, instead of doing atomic operations on it. - Remove DROP_GIANT()/PICKUP_GIANT() - ggate is marked as MPSAFE and no Giant there.
642 lines
16 KiB
C
642 lines
16 KiB
C
/*-
|
|
* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#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/sysctl.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/time.h>
|
|
#include <machine/atomic.h>
|
|
|
|
#include <geom/geom.h>
|
|
#include <geom/gate/g_gate.h>
|
|
|
|
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 u_int g_gate_debug = 0;
|
|
SYSCTL_UINT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0,
|
|
"Debug level");
|
|
|
|
static int g_gate_destroy_geom(struct gctl_req *, struct g_class *,
|
|
struct g_geom *);
|
|
struct g_class g_gate_class = {
|
|
.name = G_GATE_CLASS_NAME,
|
|
.version = G_VERSION,
|
|
.destroy_geom = g_gate_destroy_geom
|
|
};
|
|
|
|
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 LIST_HEAD(, g_gate_softc) g_gate_list =
|
|
LIST_HEAD_INITIALIZER(&g_gate_list);
|
|
static struct mtx g_gate_list_mtx;
|
|
|
|
|
|
static void
|
|
g_gate_wither(struct g_gate_softc *sc)
|
|
{
|
|
|
|
atomic_set_32(&sc->sc_flags, G_GATE_FLAG_DESTROY);
|
|
}
|
|
|
|
static int
|
|
g_gate_destroy(struct g_gate_softc *sc, boolean_t force)
|
|
{
|
|
struct g_provider *pp;
|
|
struct bio *bp;
|
|
|
|
g_topology_assert();
|
|
mtx_assert(&g_gate_list_mtx, MA_OWNED);
|
|
pp = sc->sc_provider;
|
|
if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
return (EBUSY);
|
|
}
|
|
if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) {
|
|
g_gate_wither(sc);
|
|
LIST_REMOVE(sc, sc_next);
|
|
}
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
wakeup(sc);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
if (sc->sc_ref > 0) {
|
|
G_GATE_DEBUG(1, "Cannot destroy %s yet.", sc->sc_name);
|
|
return (0);
|
|
}
|
|
callout_drain(&sc->sc_callout);
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
for (;;) {
|
|
bp = bioq_first(&sc->sc_inqueue);
|
|
if (bp != NULL) {
|
|
bioq_remove(&sc->sc_inqueue, bp);
|
|
sc->sc_queue_count--;
|
|
G_GATE_LOGREQ(1, bp, "Request canceled.");
|
|
g_io_deliver(bp, ENXIO);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
for (;;) {
|
|
bp = bioq_first(&sc->sc_outqueue);
|
|
if (bp != NULL) {
|
|
bioq_remove(&sc->sc_outqueue, bp);
|
|
sc->sc_queue_count--;
|
|
G_GATE_LOGREQ(1, bp, "Request canceled.");
|
|
g_io_deliver(bp, ENXIO);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
mtx_destroy(&sc->sc_queue_mtx);
|
|
G_GATE_DEBUG(0, "Device %s destroyed.", sc->sc_name);
|
|
pp->geom->softc = NULL;
|
|
g_wither_geom(pp->geom, ENXIO);
|
|
sc->sc_provider = NULL;
|
|
free(sc, M_GATE);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
g_gate_destroy_it(void *arg, int flag __unused)
|
|
{
|
|
struct g_gate_softc *sc;
|
|
|
|
g_topology_assert();
|
|
sc = arg;
|
|
mtx_lock(&g_gate_list_mtx);
|
|
g_gate_destroy(sc, 1);
|
|
}
|
|
|
|
static int
|
|
g_gate_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
|
|
{
|
|
|
|
g_topology_assert();
|
|
mtx_lock(&g_gate_list_mtx);
|
|
return (g_gate_destroy(gp->softc, 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:
|
|
/* 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_count > sc->sc_queue_size) {
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
G_GATE_LOGREQ(1, bp, "Queue full, request canceled.");
|
|
g_io_deliver(bp, EIO);
|
|
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_find(u_int unit)
|
|
{
|
|
struct g_gate_softc *sc;
|
|
|
|
mtx_assert(&g_gate_list_mtx, MA_OWNED);
|
|
LIST_FOREACH(sc, &g_gate_list, sc_next) {
|
|
if (sc->sc_unit == unit)
|
|
break;
|
|
}
|
|
return (sc);
|
|
}
|
|
|
|
static struct g_gate_softc *
|
|
g_gate_hold(u_int unit)
|
|
{
|
|
struct g_gate_softc *sc;
|
|
|
|
mtx_lock(&g_gate_list_mtx);
|
|
sc = g_gate_find(unit);
|
|
if (sc != NULL) {
|
|
if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0)
|
|
sc = NULL;
|
|
else
|
|
sc->sc_ref++;
|
|
}
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
return (sc);
|
|
}
|
|
|
|
static void
|
|
g_gate_release(struct g_gate_softc *sc)
|
|
{
|
|
|
|
g_topology_assert_not();
|
|
mtx_lock(&g_gate_list_mtx);
|
|
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) {
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
g_waitfor_event(g_gate_destroy_it, sc, M_WAITOK, NULL);
|
|
} else {
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
}
|
|
}
|
|
|
|
static int
|
|
g_gate_getunit(int unit)
|
|
{
|
|
struct g_gate_softc *sc;
|
|
|
|
mtx_assert(&g_gate_list_mtx, MA_OWNED);
|
|
if (unit >= 0) {
|
|
LIST_FOREACH(sc, &g_gate_list, sc_next) {
|
|
if (sc->sc_unit == unit)
|
|
return (-1);
|
|
}
|
|
} else {
|
|
unit = 0;
|
|
once_again:
|
|
LIST_FOREACH(sc, &g_gate_list, sc_next) {
|
|
if (sc->sc_unit == unit) {
|
|
if (++unit > 666)
|
|
return (-1);
|
|
goto once_again;
|
|
}
|
|
}
|
|
}
|
|
return (unit);
|
|
}
|
|
|
|
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);
|
|
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);
|
|
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);
|
|
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;
|
|
|
|
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 < -1) {
|
|
G_GATE_DEBUG(1, "Invalid unit number.");
|
|
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 = 0;
|
|
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_list_mtx);
|
|
ggio->gctl_unit = g_gate_getunit(ggio->gctl_unit);
|
|
if (ggio->gctl_unit == -1) {
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
mtx_destroy(&sc->sc_queue_mtx);
|
|
free(sc, M_GATE);
|
|
return (EBUSY);
|
|
}
|
|
sc->sc_unit = ggio->gctl_unit;
|
|
LIST_INSERT_HEAD(&g_gate_list, sc, sc_next);
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
|
|
g_topology_lock();
|
|
gp = g_new_geomf(&g_gate_class, "%s%d", G_GATE_PROVIDER_NAME,
|
|
sc->sc_unit);
|
|
gp->start = g_gate_start;
|
|
gp->access = g_gate_access;
|
|
gp->dumpconf = g_gate_dumpconf;
|
|
gp->softc = sc;
|
|
pp = g_new_providerf(gp, "%s%d", G_GATE_PROVIDER_NAME, sc->sc_unit);
|
|
pp->mediasize = ggio->gctl_mediasize;
|
|
pp->sectorsize = ggio->gctl_sectorsize;
|
|
sc->sc_provider = pp;
|
|
g_error_provider(pp, 0);
|
|
g_topology_unlock();
|
|
|
|
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) \
|
|
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);
|
|
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);
|
|
if (sc == NULL)
|
|
return (ENXIO);
|
|
g_topology_lock();
|
|
mtx_lock(&g_gate_list_mtx);
|
|
error = g_gate_destroy(sc, ggio->gctl_force);
|
|
if (error == 0)
|
|
g_gate_wither(sc);
|
|
g_topology_unlock();
|
|
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_find(ggio->gctl_unit);
|
|
if (sc == NULL)
|
|
return (ENXIO);
|
|
for (;;) {
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bp = bioq_first(&sc->sc_inqueue);
|
|
if (bp != NULL)
|
|
break;
|
|
if (msleep(sc, &sc->sc_queue_mtx,
|
|
PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) {
|
|
ggio->gctl_error = ECANCELED;
|
|
return (0);
|
|
}
|
|
if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) {
|
|
ggio->gctl_error = ECANCELED;
|
|
return (0);
|
|
}
|
|
}
|
|
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;
|
|
return (0);
|
|
}
|
|
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:
|
|
break;
|
|
case BIO_DELETE:
|
|
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);
|
|
return (error);
|
|
}
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
case G_GATE_CMD_DONE:
|
|
{
|
|
struct g_gate_ctl_io *ggio = (void *)addr;
|
|
|
|
G_GATE_CHECK_VERSION(ggio);
|
|
sc = g_gate_find(ggio->gctl_unit);
|
|
if (sc == NULL)
|
|
return (ENOENT);
|
|
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.
|
|
*/
|
|
return (0);
|
|
}
|
|
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:
|
|
break;
|
|
}
|
|
}
|
|
G_GATE_LOGREQ(2, bp, "Request done.");
|
|
g_io_deliver(bp, bp->bio_error);
|
|
}
|
|
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_list_mtx, "gg_list_lock", NULL, MTX_DEF);
|
|
g_gate_device();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
mtx_lock(&g_gate_list_mtx);
|
|
if (!LIST_EMPTY(&g_gate_list)) {
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
mtx_unlock(&g_gate_list_mtx);
|
|
mtx_destroy(&g_gate_list_mtx);
|
|
if (status_dev != 0)
|
|
destroy_dev(status_dev);
|
|
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);
|