/*-
* Implementation of the Target Mode 'Black Hole device' for CAM.
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1999 Justin T. Gibbs.
* 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,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/devicestat.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_periph.h>
#include <cam/cam_queue.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_debug.h>
#include <cam/cam_sim.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
static MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers");
typedef enum {
TARGBH_STATE_NORMAL,
TARGBH_STATE_EXCEPTION,
TARGBH_STATE_TEARDOWN
} targbh_state;
typedef enum {
TARGBH_FLAG_NONE = 0x00,
TARGBH_FLAG_LUN_ENABLED = 0x01
} targbh_flags;
typedef enum {
TARGBH_CCB_WORKQ
} targbh_ccb_types;
#define MAX_ACCEPT 8
#define MAX_IMMEDIATE 16
#define MAX_BUF_SIZE 256 /* Max inquiry/sense/mode page transfer */
/* Offsets into our private CCB area for storing accept information */
#define ccb_type ppriv_field0
#define ccb_descr ppriv_ptr1
/* We stick a pointer to the originating accept TIO in each continue I/O CCB */
#define ccb_atio ppriv_ptr1
TAILQ_HEAD(ccb_queue, ccb_hdr);
struct targbh_softc {
struct ccb_queue pending_queue;
struct ccb_queue work_queue;
struct ccb_queue unknown_atio_queue;
struct devstat device_stats;
targbh_state state;
targbh_flags flags;
u_int init_level;
u_int inq_data_len;
struct ccb_accept_tio *accept_tio_list;
struct ccb_hdr_slist immed_notify_slist;
};
struct targbh_cmd_desc {
struct ccb_accept_tio* atio_link;
u_int data_resid; /* How much left to transfer */
u_int data_increment;/* Amount to send before next disconnect */
void* data; /* The data. Can be from backing_store or not */
void* backing_store;/* Backing store allocated for this descriptor*/
u_int max_size; /* Size of backing_store */
uint32_t timeout;
uint8_t status; /* Status to return to initiator */
};
static struct scsi_inquiry_data no_lun_inq_data =
{
T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
/* version */2, /* format version */2
};
static struct scsi_sense_data_fixed no_lun_sense_data =
{
SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
0,
SSD_KEY_NOT_READY,
{ 0, 0, 0, 0 },
/*extra_len*/offsetof(struct scsi_sense_data_fixed, fru)
- offsetof(struct scsi_sense_data_fixed, extra_len),
{ 0, 0, 0, 0 },
/* Logical Unit Not Supported */
/*ASC*/0x25, /*ASCQ*/0
};
static const int request_sense_size = offsetof(struct scsi_sense_data_fixed, fru);
static periph_init_t targbhinit;
static void targbhasync(void *callback_arg, uint32_t code,
struct cam_path *path, void *arg);
static cam_status targbhenlun(struct cam_periph *periph);
static cam_status targbhdislun(struct cam_periph *periph);
static periph_ctor_t targbhctor;
static periph_dtor_t targbhdtor;
static periph_start_t targbhstart;
static void targbhdone(struct cam_periph *periph,
union ccb *done_ccb);
#ifdef NOTYET
static int targbherror(union ccb *ccb, uint32_t cam_flags,
uint32_t sense_flags);
#endif
static struct targbh_cmd_desc* targbhallocdescr(void);
static void targbhfreedescr(struct targbh_cmd_desc *buf);
static struct periph_driver targbhdriver =
{
targbhinit, "targbh",
TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
};
PERIPHDRIVER_DECLARE(targbh, targbhdriver);
static void
targbhinit(void)
{
cam_status status;
/*
* Install a global async callback. This callback will
* receive async callbacks like "new path registered".
*/
status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED,
targbhasync, NULL, NULL);
if (status != CAM_REQ_CMP) {
printf("targbh: Failed to attach master async callback "
"due to status 0x%x!\n", status);
}
}
static void
targbhasync(void *callback_arg, uint32_t code,
struct cam_path *path, void *arg)
{
struct cam_path *new_path;
struct ccb_pathinq *cpi;
path_id_t bus_path_id;
cam_status status;
cpi = (struct ccb_pathinq *)arg;
if (code == AC_PATH_REGISTERED)
bus_path_id = cpi->ccb_h.path_id;
else
bus_path_id = xpt_path_path_id(path);
/*
* Allocate a peripheral instance for
* this target instance.
*/
status = xpt_create_path(&new_path, NULL,
bus_path_id,
CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
if (status != CAM_REQ_CMP) {
printf("targbhasync: Unable to create path "
"due to status 0x%x\n", status);
return;
}
switch (code) {
case AC_PATH_REGISTERED:
{
/* Only attach to controllers that support target mode */
if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
break;
status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
targbhstart,
"targbh", CAM_PERIPH_BIO,
new_path, targbhasync,
AC_PATH_REGISTERED,
cpi);
break;
}
case AC_PATH_DEREGISTERED:
{
struct cam_periph *periph;
if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
cam_periph_invalidate(periph);
break;
}
default:
break;
}
xpt_free_path(new_path);
}
/* Attempt to enable our lun */
static cam_status
targbhenlun(struct cam_periph *periph)
{
union ccb immed_ccb;
struct targbh_softc *softc;
cam_status status;
int i;
softc = (struct targbh_softc *)periph->softc;
if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
return (CAM_REQ_CMP);
memset(&immed_ccb, 0, sizeof(immed_ccb));
xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
immed_ccb.ccb_h.func_code = XPT_EN_LUN;
/* Don't need support for any vendor specific commands */
immed_ccb.cel.grp6_len = 0;
immed_ccb.cel.grp7_len = 0;
immed_ccb.cel.enable = 1;
xpt_action(&immed_ccb);
status = immed_ccb.ccb_h.status;
if (status != CAM_REQ_CMP) {
xpt_print(periph->path,
"targbhenlun - Enable Lun Rejected with status 0x%x\n",
status);
return (status);
}
softc->flags |= TARGBH_FLAG_LUN_ENABLED;
/*
* Build up a buffer of accept target I/O
* operations for incoming selections.
*/
for (i = 0; i < MAX_ACCEPT; i++) {
struct ccb_accept_tio *atio;
atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH,
M_ZERO | M_NOWAIT);
if (atio == NULL) {
status = CAM_RESRC_UNAVAIL;
break;
}
atio->ccb_h.ccb_descr = targbhallocdescr();
if (atio->ccb_h.ccb_descr == NULL) {
free(atio, M_SCSIBH);
status = CAM_RESRC_UNAVAIL;
break;
}
xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
atio->ccb_h.cbfcnp = targbhdone;
((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
softc->accept_tio_list;
softc->accept_tio_list = atio;
xpt_action((union ccb *)atio);
status = atio->ccb_h.status;
if (status != CAM_REQ_INPROG)
break;
}
if (i == 0) {
xpt_print(periph->path,
"targbhenlun - Could not allocate accept tio CCBs: status "
"= 0x%x\n", status);
targbhdislun(periph);
return (CAM_REQ_CMP_ERR);
}
/*
* Build up a buffer of immediate notify CCBs
* so the SIM can tell us of asynchronous target mode events.
*/
for (i = 0; i < MAX_ACCEPT; i++) {
struct ccb_immediate_notify *inot;
inot = (struct ccb_immediate_notify*)malloc(sizeof(*inot),
M_SCSIBH, M_ZERO | M_NOWAIT);
if (inot == NULL) {
status = CAM_RESRC_UNAVAIL;
break;
}
xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
inot->ccb_h.func_code = XPT_IMMEDIATE_NOTIFY;
inot->ccb_h.cbfcnp = targbhdone;
SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
periph_links.sle);
xpt_action((union ccb *)inot);
status = inot->ccb_h.status;
if (status != CAM_REQ_INPROG)
break;
}
if (i == 0) {
xpt_print(periph->path,
"targbhenlun - Could not allocate immediate notify "
"CCBs: status = 0x%x\n", status);
targbhdislun(periph);
return (CAM_REQ_CMP_ERR);
}
return (CAM_REQ_CMP);
}
static cam_status
targbhdislun(struct cam_periph *periph)
{
union ccb ccb;
struct targbh_softc *softc;
struct ccb_accept_tio* atio;
struct ccb_hdr *ccb_h;
softc = (struct targbh_softc *)periph->softc;
if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
return CAM_REQ_CMP;
memset(&ccb, 0, sizeof(ccb));
/* XXX Block for Continue I/O completion */
/* Kill off all ACCECPT and IMMEDIATE CCBs */
while ((atio = softc->accept_tio_list) != NULL) {
softc->accept_tio_list =
((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
ccb.cab.ccb_h.func_code = XPT_ABORT;
ccb.cab.abort_ccb = (union ccb *)atio;
xpt_action(&ccb);
}
while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
ccb.cab.ccb_h.func_code = XPT_ABORT;
ccb.cab.abort_ccb = (union ccb *)ccb_h;
xpt_action(&ccb);
}
/*
* Dissable this lun.
*/
xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
ccb.cel.ccb_h.func_code = XPT_EN_LUN;
ccb.cel.enable = 0;
xpt_action(&ccb);
if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
printf("targbhdislun - Disabling lun on controller failed "
"with status 0x%x\n", ccb.cel.ccb_h.status);
else
softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
return (ccb.cel.ccb_h.status);
}
static cam_status
targbhctor(struct cam_periph *periph, void *arg)
{
struct targbh_softc *softc;
/* Allocate our per-instance private storage */
softc = (struct targbh_softc *)malloc(sizeof(*softc),
M_SCSIBH, M_NOWAIT);
if (softc == NULL) {
printf("targctor: unable to malloc softc\n");
return (CAM_REQ_CMP_ERR);
}
bzero(softc, sizeof(*softc));
TAILQ_INIT(&softc->pending_queue);
TAILQ_INIT(&softc->work_queue);
softc->accept_tio_list = NULL;
SLIST_INIT(&softc->immed_notify_slist);
softc->state = TARGBH_STATE_NORMAL;
periph->softc = softc;
softc->init_level++;
if (targbhenlun(periph) != CAM_REQ_CMP)
cam_periph_invalidate(periph);
return (CAM_REQ_CMP);
}
static void
targbhdtor(struct cam_periph *periph)
{
struct targbh_softc *softc;
softc = (struct targbh_softc *)periph->softc;
softc->state = TARGBH_STATE_TEARDOWN;
targbhdislun(periph);
switch (softc->init_level) {
case 0:
panic("targdtor - impossible init level");
case 1:
/* FALLTHROUGH */
default:
/* XXX Wait for callback of targbhdislun() */
cam_periph_sleep(periph, softc, PRIBIO, "targbh", hz/2);
free(softc, M_SCSIBH);
break;
}
}
static void
targbhstart(struct cam_periph *periph, union ccb *start_ccb)
{
struct targbh_softc *softc;
struct ccb_hdr *ccbh;
struct ccb_accept_tio *atio;
struct targbh_cmd_desc *desc;
struct ccb_scsiio *csio;
ccb_flags flags;
softc = (struct targbh_softc *)periph->softc;
ccbh = TAILQ_FIRST(&softc->work_queue);
if (ccbh == NULL) {
xpt_release_ccb(start_ccb);
} else {
TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
periph_links.tqe);
atio = (struct ccb_accept_tio*)ccbh;
desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
/* Is this a tagged request? */
flags = atio->ccb_h.flags &
(CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
csio = &start_ccb->csio;
/*
* If we are done with the transaction, tell the
* controller to send status and perform a CMD_CMPLT.
* If we have associated sense data, see if we can
* send that too.
*/
if (desc->data_resid == desc->data_increment) {
flags |= CAM_SEND_STATUS;
if (atio->sense_len) {
csio->sense_len = atio->sense_len;
csio->sense_data = atio->sense_data;
flags |= CAM_SEND_SENSE;
}
}
cam_fill_ctio(csio,
/*retries*/2,
targbhdone,
flags,
(flags & CAM_TAG_ACTION_VALID)?
MSG_SIMPLE_Q_TAG : 0,
atio->tag_id,
atio->init_id,
desc->status,
/*data_ptr*/desc->data_increment == 0
? NULL : desc->data,
/*dxfer_len*/desc->data_increment,
/*timeout*/desc->timeout);
/* Override our wildcard attachment */
start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
start_ccb->ccb_h.ccb_atio = atio;
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Sending a CTIO\n"));
xpt_action(start_ccb);
/*
* If the queue was frozen waiting for the response
* to this ATIO (for instance disconnection was disallowed),
* then release it now that our response has been queued.
*/
if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
cam_release_devq(periph->path,
/*relsim_flags*/0,
/*reduction*/0,
/*timeout*/0,
/*getcount_only*/0);
atio->ccb_h.status &= ~CAM_DEV_QFRZN;
}
ccbh = TAILQ_FIRST(&softc->work_queue);
}
if (ccbh != NULL)
xpt_schedule(periph, CAM_PRIORITY_NORMAL);
}
static void
targbhdone(struct cam_periph *periph, union ccb *done_ccb)
{
struct targbh_softc *softc;
softc = (struct targbh_softc *)periph->softc;
switch (done_ccb->ccb_h.func_code) {
case XPT_ACCEPT_TARGET_IO:
{
struct ccb_accept_tio *atio;
struct targbh_cmd_desc *descr;
uint8_t *cdb;
int priority;
atio = &done_ccb->atio;
descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
cdb = atio->cdb_io.cdb_bytes;
if (softc->state == TARGBH_STATE_TEARDOWN
|| atio->ccb_h.status == CAM_REQ_ABORTED) {
targbhfreedescr(descr);
xpt_free_ccb(done_ccb);
return;
}
/*
* Determine the type of incoming command and
* setup our buffer for a response.
*/
switch (cdb[0]) {
case INQUIRY:
{
struct scsi_inquiry *inq;
inq = (struct scsi_inquiry *)cdb;
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Saw an inquiry!\n"));
/*
* Validate the command. We don't
* support any VPD pages, so complain
* if EVPD is set.
*/
if ((inq->byte2 & SI_EVPD) != 0
|| inq->page_code != 0) {
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_NONE;
/*
* This needs to have other than a
* no_lun_sense_data response.
*/
bcopy(&no_lun_sense_data, &atio->sense_data,
min(sizeof(no_lun_sense_data),
sizeof(atio->sense_data)));
atio->sense_len = sizeof(no_lun_sense_data);
descr->data_resid = 0;
descr->data_increment = 0;
descr->status = SCSI_STATUS_CHECK_COND;
break;
}
/*
* Direction is always relative
* to the initator.
*/
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_IN;
descr->data = &no_lun_inq_data;
descr->data_resid = MIN(sizeof(no_lun_inq_data),
scsi_2btoul(inq->length));
descr->data_increment = descr->data_resid;
descr->timeout = 5 * 1000;
descr->status = SCSI_STATUS_OK;
break;
}
case REQUEST_SENSE:
{
struct scsi_request_sense *rsense;
rsense = (struct scsi_request_sense *)cdb;
/* Refer to static sense data */
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_IN;
descr->data = &no_lun_sense_data;
descr->data_resid = request_sense_size;
descr->data_resid = MIN(descr->data_resid,
SCSI_CDB6_LEN(rsense->length));
descr->data_increment = descr->data_resid;
descr->timeout = 5 * 1000;
descr->status = SCSI_STATUS_OK;
break;
}
default:
/* Constant CA, tell initiator */
/* Direction is always relative to the initator */
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_NONE;
bcopy(&no_lun_sense_data, &atio->sense_data,
min(sizeof(no_lun_sense_data),
sizeof(atio->sense_data)));
atio->sense_len = sizeof (no_lun_sense_data);
descr->data_resid = 0;
descr->data_increment = 0;
descr->timeout = 5 * 1000;
descr->status = SCSI_STATUS_CHECK_COND;
break;
}
/* Queue us up to receive a Continue Target I/O ccb. */
if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
periph_links.tqe);
priority = 0;
} else {
TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
periph_links.tqe);
priority = CAM_PRIORITY_NORMAL;
}
xpt_schedule(periph, priority);
break;
}
case XPT_CONT_TARGET_IO:
{
struct ccb_accept_tio *atio;
struct targbh_cmd_desc *desc;
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Received completed CTIO\n"));
atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
periph_links.tqe);
/*
* We could check for CAM_SENT_SENSE bein set here,
* but since we're not maintaining any CA/UA state,
* there's no point.
*/
atio->sense_len = 0;
done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
/*
* Any errors will not change the data we return,
* so make sure the queue is not left frozen.
* XXX - At some point there may be errors that
* leave us in a connected state with the
* initiator...
*/
if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
printf("Releasing Queue\n");
cam_release_devq(done_ccb->ccb_h.path,
/*relsim_flags*/0,
/*reduction*/0,
/*timeout*/0,
/*getcount_only*/0);
done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
}
desc->data_resid -= desc->data_increment;
xpt_release_ccb(done_ccb);
if (softc->state != TARGBH_STATE_TEARDOWN) {
/*
* Send the original accept TIO back to the
* controller to handle more work.
*/
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Returning ATIO to target\n"));
/* Restore wildcards */
atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
xpt_action((union ccb *)atio);
break;
} else {
targbhfreedescr(desc);
free(atio, M_SCSIBH);
}
break;
}
case XPT_IMMEDIATE_NOTIFY:
{
int frozen;
frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
if (softc->state == TARGBH_STATE_TEARDOWN
|| done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
printf("Freed an immediate notify\n");
xpt_free_ccb(done_ccb);
} else {
/* Requeue for another immediate event */
xpt_action(done_ccb);
}
if (frozen != 0)
cam_release_devq(periph->path,
/*relsim_flags*/0,
/*opening reduction*/0,
/*timeout*/0,
/*getcount_only*/0);
break;
}
default:
panic("targbhdone: Unexpected ccb opcode");
break;
}
}
#ifdef NOTYET
static int
targbherror(union ccb *ccb, uint32_t cam_flags, uint32_t sense_flags)
{
return 0;
}
#endif
static struct targbh_cmd_desc*
targbhallocdescr(void)
{
struct targbh_cmd_desc* descr;
/* Allocate the targbh_descr structure */
descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
M_SCSIBH, M_NOWAIT);
if (descr == NULL)
return (NULL);
bzero(descr, sizeof(*descr));
/* Allocate buffer backing store */
descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT);
if (descr->backing_store == NULL) {
free(descr, M_SCSIBH);
return (NULL);
}
descr->max_size = MAX_BUF_SIZE;
return (descr);
}
static void
targbhfreedescr(struct targbh_cmd_desc *descr)
{
free(descr->backing_store, M_SCSIBH);
free(descr, M_SCSIBH);
}
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