| Current Path : /sys/amd64/compile/hs32/modules/usr/src/sys/modules/txp/@/dev/iscsi/initiator/ |
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/txp/@/dev/iscsi/initiator/iscsi.c |
/*-
* Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
* 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 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 THE 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.
*
*/
/*
| $Id: iscsi.c 752 2009-08-20 11:23:28Z danny $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/iscsi/initiator/iscsi.c 224778 2011-08-11 12:30:23Z rwatson $");
#include "opt_iscsi_initiator.h"
#include <sys/param.h>
#include <sys/capability.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/socketvar.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/ioccom.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <vm/uma.h>
#include <sys/sx.h>
#include <dev/iscsi/initiator/iscsi.h>
#include <dev/iscsi/initiator/iscsivar.h>
static char *iscsi_driver_version = "2.2.4.2";
static struct isc_softc *isc;
MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI driver");
MALLOC_DEFINE(M_ISCSIBUF, "iSCbuf", "iSCSI buffers");
MALLOC_DEFINE(M_TMP, "iSCtmp", "iSCSI tmp");
#ifdef ISCSI_INITIATOR_DEBUG
int iscsi_debug = ISCSI_INITIATOR_DEBUG;
SYSCTL_INT(_debug, OID_AUTO, iscsi_initiator, CTLFLAG_RW, &iscsi_debug, 0,
"iSCSI driver debug flag");
struct mtx iscsi_dbg_mtx;
#endif
static int max_sessions = MAX_SESSIONS;
SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_sessions, CTLFLAG_RDTUN, &max_sessions, MAX_SESSIONS,
"Max sessions allowed");
static int max_pdus = MAX_PDUS;
SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_pdus, CTLFLAG_RDTUN, &max_pdus, MAX_PDUS,
"Max pdu pool");
static char isid[6+1] = {
0x80,
'D',
'I',
'B',
'0',
'0',
0
};
static int i_create_session(struct cdev *dev, int *ndev);
static int i_ping(struct cdev *dev);
static int i_send(struct cdev *dev, caddr_t arg, struct thread *td);
static int i_recv(struct cdev *dev, caddr_t arg, struct thread *td);
static int i_setsoc(isc_session_t *sp, int fd, struct thread *td);
static int i_fullfeature(struct cdev *dev, int flag);
static d_open_t iscsi_open;
static d_close_t iscsi_close;
static d_ioctl_t iscsi_ioctl;
#ifdef ISCSI_INITIATOR_DEBUG
static d_read_t iscsi_read;
#endif
static struct cdevsw iscsi_cdevsw = {
.d_version = D_VERSION,
.d_open = iscsi_open,
.d_close = iscsi_close,
.d_ioctl = iscsi_ioctl,
#ifdef ISCSI_INITIATOR_DEBUG
.d_read = iscsi_read,
#endif
.d_name = "iSCSI",
};
static int
iscsi_open(struct cdev *dev, int flags, int otype, struct thread *td)
{
debug_called(8);
debug(7, "dev=%d", dev2unit(dev));
if(dev2unit(dev) > max_sessions) {
// should not happen
return ENODEV;
}
return 0;
}
static int
iscsi_close(struct cdev *dev, int flag, int otyp, struct thread *td)
{
isc_session_t *sp;
debug_called(8);
debug(3, "session=%d flag=%x", dev2unit(dev), flag);
if(dev2unit(dev) == max_sessions) {
return 0;
}
sp = dev->si_drv2;
if(sp != NULL) {
sdebug(3, "sp->flags=%x", sp->flags );
/*
| if still in full phase, this probably means
| that something went realy bad.
| it could be a result from 'shutdown', in which case
| we will ignore it (so buffers can be flushed).
| the problem is that there is no way of differentiating
| between a shutdown procedure and 'iscontrol' dying.
*/
if(sp->flags & ISC_FFPHASE)
// delay in case this is a shutdown.
tsleep(sp, PRIBIO, "isc-cls", 60*hz);
ism_stop(sp);
}
debug(2, "done");
return 0;
}
static int
iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
{
struct isc_softc *sc;
isc_session_t *sp;
isc_opt_t *opt;
int error;
debug_called(8);
error = 0;
if(dev2unit(dev) == max_sessions) {
/*
| non Session commands
*/
sc = dev->si_drv1;
if(sc == NULL)
return ENXIO;
switch(cmd) {
case ISCSISETSES:
error = i_create_session(dev, (int *)arg);
if(error == 0)
break;
default:
error = ENXIO;
}
return error;
}
/*
| session commands
*/
sp = dev->si_drv2;
if(sp == NULL)
return ENXIO;
sdebug(6, "dev=%d cmd=%d", dev2unit(dev), (int)(cmd & 0xff));
switch(cmd) {
case ISCSISETSOC:
error = i_setsoc(sp, *(u_int *)arg, td);
break;
case ISCSISETOPT:
opt = (isc_opt_t *)arg;
error = i_setopt(sp, opt);
break;
case ISCSISEND:
error = i_send(dev, arg, td);
break;
case ISCSIRECV:
error = i_recv(dev, arg, td);
break;
case ISCSIPING:
error = i_ping(dev);
break;
case ISCSISTART:
error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 1);
if(error == 0) {
sp->proc = td->td_proc;
SYSCTL_ADD_INT(&sp->clist, SYSCTL_CHILDREN(sp->oid),
OID_AUTO, "pid", CTLFLAG_RD,
&sp->proc->p_pid, sizeof(pid_t), "control process id");
}
break;
case ISCSIRESTART:
error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 2);
break;
case ISCSISTOP:
error = i_fullfeature(dev, 0);
break;
case ISCSISIGNAL: {
int sig = *(int *)arg;
if(sig < 0 || sig > _SIG_MAXSIG)
error = EINVAL;
else
sp->signal = sig;
break;
}
case ISCSIGETCAM: {
iscsi_cam_t *cp = (iscsi_cam_t *)arg;
error = ic_getCamVals(sp, cp);
break;
}
default:
error = ENOIOCTL;
}
return error;
}
static int
iscsi_read(struct cdev *dev, struct uio *uio, int ioflag)
{
#ifdef ISCSI_INITIATOR_DEBUG
struct isc_softc *sc;
isc_session_t *sp;
pduq_t *pq;
char buf[1024];
sc = dev->si_drv1;
sp = dev->si_drv2;
if(dev2unit(dev) == max_sessions) {
sprintf(buf, "/----- Session ------/\n");
uiomove(buf, strlen(buf), uio);
int i = 0;
TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
if(uio->uio_resid == 0)
return 0;
sprintf(buf, "%03d] '%s' '%s'\n", i++, sp->opt.targetAddress, sp->opt.targetName);
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- free -----/\n", sc->npdu_alloc, sc->npdu_max);
i = 0;
uiomove(buf, strlen(buf), uio);
}
else {
int i = 0;
struct socket *so = sp->soc;
#define pukeit(i, pq) do {\
sprintf(buf, "%03d] %06x %02x %06x %06x %jd\n",\
i, ntohl(pq->pdu.ipdu.bhs.CmdSN),\
pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
ntohl(pq->pdu.ipdu.bhs.ExpStSN),\
(intmax_t)pq->ts.sec);\
} while(0)
sprintf(buf, "%d/%d /---- hld -----/\n", sp->stats.nhld, sp->stats.max_hld);
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->hld, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- rsp -----/\n", sp->stats.nrsp, sp->stats.max_rsp);
uiomove(buf, strlen(buf), uio);
i = 0;
TAILQ_FOREACH(pq, &sp->rsp, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- csnd -----/\n", sp->stats.ncsnd, sp->stats.max_csnd);
i = 0;
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->csnd, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- wsnd -----/\n", sp->stats.nwsnd, sp->stats.max_wsnd);
i = 0;
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->wsnd, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- isnd -----/\n", sp->stats.nisnd, sp->stats.max_isnd);
i = 0;
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->isnd, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "/---- Stats ---/\n");
uiomove(buf, strlen(buf), uio);
sprintf(buf, "recv=%d sent=%d\n", sp->stats.nrecv, sp->stats.nsent);
uiomove(buf, strlen(buf), uio);
sprintf(buf, "flags=%x pdus: alloc=%d max=%d\n",
sp->flags, sc->npdu_alloc, sc->npdu_max);
uiomove(buf, strlen(buf), uio);
sprintf(buf, "cws=%d last cmd=%x exp=%x max=%x stat=%x itt=%x\n",
sp->cws, sp->sn.cmd, sp->sn.expCmd, sp->sn.maxCmd, sp->sn.stat, sp->sn.itt);
uiomove(buf, strlen(buf), uio);
sprintf(buf, "/---- socket -----/\nso_count=%d so_state=%x\n", so->so_count, so->so_state);
uiomove(buf, strlen(buf), uio);
}
#endif
return 0;
}
static int
i_ping(struct cdev *dev)
{
return 0;
}
/*
| low level I/O
*/
static int
i_setsoc(isc_session_t *sp, int fd, struct thread *td)
{
int error = 0;
if(sp->soc != NULL)
isc_stop_receiver(sp);
error = fget(td, fd, CAP_SOCK_ALL, &sp->fp);
if(error)
return error;
if((error = fgetsock(td, fd, CAP_SOCK_ALL, &sp->soc, 0)) == 0) {
sp->td = td;
isc_start_receiver(sp);
}
else {
fdrop(sp->fp, td);
sp->fp = NULL;
}
return error;
}
static int
i_send(struct cdev *dev, caddr_t arg, struct thread *td)
{
isc_session_t *sp = dev->si_drv2;
caddr_t bp;
pduq_t *pq;
pdu_t *pp;
int n, error;
debug_called(8);
if(sp->soc == NULL)
return ENOTCONN;
if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL)
return EAGAIN;
pp = &pq->pdu;
pq->pdu = *(pdu_t *)arg;
if((error = i_prepPDU(sp, pq)) != 0)
goto out;
bp = NULL;
if((pq->len - sizeof(union ipdu_u)) > 0) {
pq->buf = bp = malloc(pq->len - sizeof(union ipdu_u), M_ISCSIBUF, M_NOWAIT);
if(pq->buf == NULL) {
error = EAGAIN;
goto out;
}
}
else
pq->buf = NULL; // just in case?
sdebug(2, "len=%d ahs_len=%d ds_len=%d buf=%zu@%p",
pq->len, pp->ahs_len, pp->ds_len, pq->len - sizeof(union ipdu_u), bp);
if(pp->ahs_len) {
// XXX: never tested, looks suspicious
n = pp->ahs_len;
error = copyin(pp->ahs_addr, bp, n);
if(error != 0) {
sdebug(3, "copyin ahs: error=%d", error);
goto out;
}
pp->ahs_addr = (ahs_t *)bp;
bp += n;
}
if(pp->ds_len) {
n = pp->ds_len;
error = copyin(pp->ds_addr, bp, n);
if(error != 0) {
sdebug(3, "copyin ds: error=%d", error);
goto out;
}
pp->ds_addr = bp;
bp += n;
while(n & 03) {
n++;
*bp++ = 0;
}
}
error = isc_qout(sp, pq);
if(error == 0)
wakeup(&sp->flags); // XXX: to 'push' proc_out ...
out:
if(error)
pdu_free(sp->isc, pq);
return error;
}
static int
i_recv(struct cdev *dev, caddr_t arg, struct thread *td)
{
isc_session_t *sp = dev->si_drv2;
pduq_t *pq;
pdu_t *pp, *up;
caddr_t bp;
int error, mustfree, cnt;
size_t need, have, n;
debug_called(8);
if(sp == NULL)
return EIO;
if(sp->soc == NULL)
return ENOTCONN;
cnt = 6; // XXX: maybe the user can request a time out?
mtx_lock(&sp->rsp_mtx);
while((pq = TAILQ_FIRST(&sp->rsp)) == NULL) {
msleep(&sp->rsp, &sp->rsp_mtx, PRIBIO, "isc_rsp", hz*10);
if(cnt-- == 0) break; // XXX: for now, needs work
}
if(pq != NULL) {
sp->stats.nrsp--;
TAILQ_REMOVE(&sp->rsp, pq, pq_link);
}
mtx_unlock(&sp->rsp_mtx);
sdebug(6, "cnt=%d", cnt);
if(pq == NULL) {
error = ENOTCONN;
sdebug(3, "error=%d sp->flags=%x ", error, sp->flags);
return error;
}
up = (pdu_t *)arg;
pp = &pq->pdu;
up->ipdu = pp->ipdu;
n = 0;
up->ds_len = 0;
up->ahs_len = 0;
error = 0;
if(pq->mp) {
u_int len;
// Grr...
len = 0;
if(pp->ahs_len) {
len += pp->ahs_len;
}
if(pp->ds_len) {
len += pp->ds_len;
}
mustfree = 0;
if(len > pq->mp->m_len) {
mustfree++;
bp = malloc(len, M_TMP, M_WAITOK);
sdebug(4, "need mbufcopy: %d", len);
i_mbufcopy(pq->mp, bp, len);
}
else
bp = mtod(pq->mp, caddr_t);
if(pp->ahs_len) {
need = pp->ahs_len;
n = MIN(up->ahs_size, need);
error = copyout(bp, (caddr_t)up->ahs_addr, n);
up->ahs_len = n;
bp += need;
}
if(!error && pp->ds_len) {
need = pp->ds_len;
if((have = up->ds_size) == 0) {
have = up->ahs_size - n;
up->ds_addr = (caddr_t)up->ahs_addr + n;
}
n = MIN(have, need);
error = copyout(bp, (caddr_t)up->ds_addr, n);
up->ds_len = n;
}
if(mustfree)
free(bp, M_TMP);
}
sdebug(6, "len=%d ahs_len=%d ds_len=%d", pq->len, pp->ahs_len, pp->ds_len);
pdu_free(sp->isc, pq);
return error;
}
static int
i_fullfeature(struct cdev *dev, int flag)
{
isc_session_t *sp = dev->si_drv2;
int error;
sdebug(2, "flag=%d", flag);
error = 0;
switch(flag) {
case 0: // stop
sp->flags &= ~ISC_FFPHASE;
break;
case 1: // start
sp->flags |= ISC_FFPHASE;
error = ic_init(sp);
break;
case 2: // restart
sp->flags |= ISC_FFPHASE;
ism_restart(sp);
break;
}
return error;
}
static int
i_create_session(struct cdev *dev, int *ndev)
{
struct isc_softc *sc = dev->si_drv1;
isc_session_t *sp;
int error, n;
debug_called(8);
sp = malloc(sizeof(isc_session_t), M_ISCSI, M_WAITOK | M_ZERO);
if(sp == NULL)
return ENOMEM;
sx_xlock(&sc->unit_sx);
if((n = alloc_unr(sc->unit)) < 0) {
sx_unlock(&sc->unit_sx);
free(sp, M_ISCSI);
xdebug("too many sessions!");
return EPERM;
}
sx_unlock(&sc->unit_sx);
mtx_lock(&sc->isc_mtx);
TAILQ_INSERT_TAIL(&sc->isc_sess, sp, sp_link);
isc->nsess++;
mtx_unlock(&sc->isc_mtx);
sp->dev = make_dev(&iscsi_cdevsw, n, UID_ROOT, GID_WHEEL, 0600, "iscsi%d", n);
*ndev = sp->sid = n;
sp->isc = sc;
sp->dev->si_drv1 = sc;
sp->dev->si_drv2 = sp;
sp->opt.maxRecvDataSegmentLength = 8192;
sp->opt.maxXmitDataSegmentLength = 8192;
sp->opt.maxBurstLength = 65536; // 64k
sp->opt.maxluns = ISCSI_MAX_LUNS;
error = ism_start(sp);
return error;
}
#ifdef notused
static void
iscsi_counters(isc_session_t *sp)
{
int h, r, s;
pduq_t *pq;
#define _puke(i, pq) do {\
debug(2, "%03d] %06x %02x %x %ld %jd %x\n",\
i, ntohl( pq->pdu.ipdu.bhs.CmdSN), \
pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
(long)pq->ts.sec, pq->ts.frac, pq->flags);\
} while(0)
h = r = s = 0;
TAILQ_FOREACH(pq, &sp->hld, pq_link) {
_puke(h, pq);
h++;
}
TAILQ_FOREACH(pq, &sp->rsp, pq_link) r++;
TAILQ_FOREACH(pq, &sp->csnd, pq_link) s++;
TAILQ_FOREACH(pq, &sp->wsnd, pq_link) s++;
TAILQ_FOREACH(pq, &sp->isnd, pq_link) s++;
debug(2, "hld=%d rsp=%d snd=%d", h, r, s);
}
#endif
static void
iscsi_shutdown(void *v)
{
struct isc_softc *sc = v;
isc_session_t *sp;
int n;
debug_called(8);
if(sc == NULL) {
xdebug("sc is NULL!");
return;
}
#ifdef DO_EVENTHANDLER
if(sc->eh == NULL)
debug(2, "sc->eh is NULL");
else {
EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->eh);
debug(2, "done n=%d", sc->nsess);
}
#endif
n = 0;
TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
debug(2, "%2d] sp->flags=0x%08x", n, sp->flags);
n++;
}
debug(2, "done");
}
static void
free_pdus(struct isc_softc *sc)
{
debug_called(8);
if(sc->pdu_zone != NULL) {
uma_zdestroy(sc->pdu_zone);
sc->pdu_zone = NULL;
}
}
static void
iscsi_start(void)
{
debug_called(8);
TUNABLE_INT_FETCH("net.iscsi_initiator.max_sessions", &max_sessions);
TUNABLE_INT_FETCH("net.iscsi_initiator.max_pdus", &max_pdus);
isc = malloc(sizeof(struct isc_softc), M_ISCSI, M_ZERO|M_WAITOK);
isc->dev = make_dev(&iscsi_cdevsw, max_sessions, UID_ROOT, GID_WHEEL, 0600, "iscsi");
isc->dev->si_drv1 = isc;
mtx_init(&isc->isc_mtx, "iscsi", NULL, MTX_DEF);
TAILQ_INIT(&isc->isc_sess);
/*
| now init the free pdu list
*/
isc->pdu_zone = uma_zcreate("pdu", sizeof(pduq_t),
NULL, NULL, NULL, NULL,
0, 0);
if(isc->pdu_zone == NULL) {
xdebug("iscsi_initiator: uma_zcreate failed");
// XXX: should fail...
}
uma_zone_set_max(isc->pdu_zone, max_pdus);
isc->unit = new_unrhdr(0, max_sessions-1, NULL);
sx_init(&isc->unit_sx, "iscsi sx");
#ifdef DO_EVENTHANDLER
if((isc->eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, iscsi_shutdown,
sc, SHUTDOWN_PRI_DEFAULT-1)) == NULL)
xdebug("shutdown event registration failed\n");
#endif
/*
| sysctl stuff
*/
sysctl_ctx_init(&isc->clist);
isc->oid = SYSCTL_ADD_NODE(&isc->clist,
SYSCTL_STATIC_CHILDREN(_net),
OID_AUTO,
"iscsi_initiator",
CTLFLAG_RD,
0,
"iSCSI Subsystem");
SYSCTL_ADD_STRING(&isc->clist,
SYSCTL_CHILDREN(isc->oid),
OID_AUTO,
"driver_version",
CTLFLAG_RD,
iscsi_driver_version,
0,
"iscsi driver version");
SYSCTL_ADD_STRING(&isc->clist,
SYSCTL_CHILDREN(isc->oid),
OID_AUTO,
"isid",
CTLFLAG_RW,
isid,
6+1,
"initiator part of the Session Identifier");
SYSCTL_ADD_INT(&isc->clist,
SYSCTL_CHILDREN(isc->oid),
OID_AUTO,
"sessions",
CTLFLAG_RD,
&isc->nsess,
sizeof(isc->nsess),
"number of active session");
printf("iscsi: version %s\n", iscsi_driver_version);
}
/*
| Notes:
| unload SHOULD fail if there is activity
| activity: there is/are active session/s
*/
static void
iscsi_stop(void)
{
isc_session_t *sp, *sp_tmp;
debug_called(8);
/*
| go through all the sessions
| Note: close should have done this ...
*/
TAILQ_FOREACH_SAFE(sp, &isc->isc_sess, sp_link, sp_tmp) {
//XXX: check for activity ...
ism_stop(sp);
if(sp->cam_sim != NULL)
ic_destroy(sp);
}
mtx_destroy(&isc->isc_mtx);
sx_destroy(&isc->unit_sx);
free_pdus(isc);
if(isc->dev)
destroy_dev(isc->dev);
if(sysctl_ctx_free(&isc->clist))
xdebug("sysctl_ctx_free failed");
iscsi_shutdown(isc); // XXX: check EVENTHANDLER_ ...
free(isc, M_ISCSI);
}
static int
iscsi_modevent(module_t mod, int what, void *arg)
{
debug_called(8);
switch(what) {
case MOD_LOAD:
iscsi_start();
break;
case MOD_QUIESCE:
if(isc->nsess) {
xdebug("iscsi module busy(nsess=%d), cannot unload", isc->nsess);
log(LOG_ERR, "iscsi module busy, cannot unload");
}
return isc->nsess;
case MOD_SHUTDOWN:
break;
case MOD_UNLOAD:
iscsi_stop();
break;
default:
break;
}
return 0;
}
moduledata_t iscsi_mod = {
"iscsi",
(modeventhand_t) iscsi_modevent,
0
};
#ifdef ISCSI_ROOT
static void
iscsi_rootconf(void)
{
#if 0
nfs_setup_diskless();
if (nfs_diskless_valid)
rootdevnames[0] = "nfs:";
#endif
printf("** iscsi_rootconf **\n");
}
SYSINIT(cpu_rootconf1, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, iscsi_rootconf, NULL)
#endif
DECLARE_MODULE(iscsi, iscsi_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_DEPEND(iscsi, cam, 1, 1, 1);