bc1805c6e8
a more complete subsystem, and removes the knowlege of how things are implemented from the drivers. Include locking around filter ops, so a module like aio will know when not to be unloaded if there are outstanding knotes using it's filter ops. Currently, it uses the MTX_DUPOK even though it is not always safe to aquire duplicate locks. Witness currently doesn't support the ability to discover if a dup lock is ok (in some cases). Reviewed by: green, rwatson (both earlier versions)
1188 lines
32 KiB
C
1188 lines
32 KiB
C
/*
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* Generic SCSI Target Kernel Mode Driver
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*
|
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* Copyright (c) 2002 Nate Lawson.
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* Copyright (c) 1998, 1999, 2001, 2002 Justin T. Gibbs.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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|
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <sys/vnode.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/devicestat.h>
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#include <cam/cam.h>
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#include <cam/cam_ccb.h>
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#include <cam/cam_periph.h>
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#include <cam/cam_xpt_periph.h>
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#include <cam/scsi/scsi_targetio.h>
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|
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/* Transaction information attached to each CCB sent by the user */
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struct targ_cmd_descr {
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struct cam_periph_map_info mapinfo;
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TAILQ_ENTRY(targ_cmd_descr) tqe;
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union ccb *user_ccb;
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int priority;
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int func_code;
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};
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|
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/* Offset into the private CCB area for storing our descriptor */
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#define targ_descr periph_priv.entries[1].ptr
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TAILQ_HEAD(descr_queue, targ_cmd_descr);
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|
|
|
typedef enum {
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TARG_STATE_RESV = 0x00, /* Invalid state */
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TARG_STATE_OPENED = 0x01, /* Device opened, softc initialized */
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TARG_STATE_LUN_ENABLED = 0x02 /* Device enabled for a path */
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} targ_state;
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|
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/* Per-instance device software context */
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struct targ_softc {
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/* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
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struct ccb_queue pending_ccb_queue;
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|
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/* Command descriptors awaiting CTIO resources from the XPT */
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struct descr_queue work_queue;
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/* Command descriptors that have been aborted back to the user. */
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struct descr_queue abort_queue;
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|
|
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/*
|
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* Queue of CCBs that have been copied out to userland, but our
|
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* userland daemon has not yet seen.
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*/
|
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struct ccb_queue user_ccb_queue;
|
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|
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struct cam_periph *periph;
|
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struct cam_path *path;
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targ_state state;
|
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struct selinfo read_select;
|
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struct devstat device_stats;
|
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struct mtx mtx;
|
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};
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|
|
|
static d_open_t targopen;
|
|
static d_close_t targclose;
|
|
static d_read_t targread;
|
|
static d_write_t targwrite;
|
|
static d_ioctl_t targioctl;
|
|
static d_poll_t targpoll;
|
|
static d_kqfilter_t targkqfilter;
|
|
static void targreadfiltdetach(struct knote *kn);
|
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static int targreadfilt(struct knote *kn, long hint);
|
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static struct filterops targread_filtops =
|
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{ 1, NULL, targreadfiltdetach, targreadfilt };
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|
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static struct cdevsw targ_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = targopen,
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.d_close = targclose,
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.d_read = targread,
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.d_write = targwrite,
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.d_ioctl = targioctl,
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.d_poll = targpoll,
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.d_name = "targ",
|
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.d_kqfilter = targkqfilter
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};
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|
|
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static cam_status targendislun(struct cam_path *path, int enable,
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int grp6_len, int grp7_len);
|
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static cam_status targenable(struct targ_softc *softc,
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struct cam_path *path,
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int grp6_len, int grp7_len);
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static cam_status targdisable(struct targ_softc *softc);
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static periph_ctor_t targctor;
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static periph_dtor_t targdtor;
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|
static periph_start_t targstart;
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static int targusermerge(struct targ_softc *softc,
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struct targ_cmd_descr *descr,
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union ccb *ccb);
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static int targsendccb(struct targ_softc *softc, union ccb *ccb,
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struct targ_cmd_descr *descr);
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static void targdone(struct cam_periph *periph,
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union ccb *done_ccb);
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static int targreturnccb(struct targ_softc *softc,
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union ccb *ccb);
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static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type,
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int priority);
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static void targfreeccb(struct targ_softc *softc, union ccb *ccb);
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static struct targ_cmd_descr *
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targgetdescr(struct targ_softc *softc);
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static periph_init_t targinit;
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static void targclone(void *arg, char *name, int namelen,
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struct cdev **dev);
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static void targasync(void *callback_arg, u_int32_t code,
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struct cam_path *path, void *arg);
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static void abort_all_pending(struct targ_softc *softc);
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static void notify_user(struct targ_softc *softc);
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static int targcamstatus(cam_status status);
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static size_t targccblen(xpt_opcode func_code);
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|
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|
static struct periph_driver targdriver =
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{
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targinit, "targ",
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TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
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};
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PERIPHDRIVER_DECLARE(targ, targdriver);
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static struct mtx targ_mtx;
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#define TARG_LOCK(softc) mtx_lock(&(softc)->mtx)
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#define TARG_UNLOCK(softc) mtx_unlock(&(softc)->mtx)
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static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
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/* Create softc and initialize it. Only one proc can open each targ device. */
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static int
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targopen(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct targ_softc *softc;
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mtx_lock(&targ_mtx);
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if (dev->si_drv1 != 0) {
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mtx_unlock(&targ_mtx);
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return (EBUSY);
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}
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/* Mark device busy before any potentially blocking operations */
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dev->si_drv1 = (void *)~0;
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mtx_unlock(&targ_mtx);
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|
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/* Create the targ device, allocate its softc, initialize it */
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if ((dev->si_flags & SI_NAMED) == 0) {
|
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make_dev(&targ_cdevsw, minor(dev), UID_ROOT, GID_WHEEL, 0600,
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"targ%d", dev2unit(dev));
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}
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MALLOC(softc, struct targ_softc *, sizeof(*softc), M_TARG,
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M_WAITOK | M_ZERO);
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dev->si_drv1 = softc;
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softc->state = TARG_STATE_OPENED;
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softc->periph = NULL;
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softc->path = NULL;
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mtx_init(&softc->mtx, devtoname(dev), "targ cdev", MTX_DEF);
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TAILQ_INIT(&softc->pending_ccb_queue);
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TAILQ_INIT(&softc->work_queue);
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TAILQ_INIT(&softc->abort_queue);
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TAILQ_INIT(&softc->user_ccb_queue);
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knlist_init(&softc->read_select.si_note, &softc->mtx);
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return (0);
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}
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/* Disable LUN if enabled and teardown softc */
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static int
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targclose(struct cdev *dev, int flag, int fmt, struct thread *td)
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{
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struct targ_softc *softc;
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int error;
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softc = (struct targ_softc *)dev->si_drv1;
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TARG_LOCK(softc);
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error = targdisable(softc);
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if (error == CAM_REQ_CMP) {
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dev->si_drv1 = 0;
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mtx_lock(&targ_mtx);
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if (softc->periph != NULL) {
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cam_periph_invalidate(softc->periph);
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softc->periph = NULL;
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}
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mtx_unlock(&targ_mtx);
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TARG_UNLOCK(softc);
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mtx_destroy(&softc->mtx);
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destroy_dev(dev);
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FREE(softc, M_TARG);
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} else {
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TARG_UNLOCK(softc);
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}
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return (error);
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}
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/* Enable/disable LUNs, set debugging level */
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static int
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targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
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{
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struct targ_softc *softc;
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cam_status status;
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softc = (struct targ_softc *)dev->si_drv1;
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switch (cmd) {
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case TARGIOCENABLE:
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{
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struct ioc_enable_lun *new_lun;
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struct cam_path *path;
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new_lun = (struct ioc_enable_lun *)addr;
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status = xpt_create_path(&path, /*periph*/NULL,
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new_lun->path_id,
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new_lun->target_id,
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new_lun->lun_id);
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if (status != CAM_REQ_CMP) {
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printf("Couldn't create path, status %#x\n", status);
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break;
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}
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TARG_LOCK(softc);
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status = targenable(softc, path, new_lun->grp6_len,
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new_lun->grp7_len);
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TARG_UNLOCK(softc);
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xpt_free_path(path);
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break;
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}
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case TARGIOCDISABLE:
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TARG_LOCK(softc);
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status = targdisable(softc);
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TARG_UNLOCK(softc);
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break;
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case TARGIOCDEBUG:
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{
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#ifdef CAMDEBUG
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struct ccb_debug cdbg;
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bzero(&cdbg, sizeof cdbg);
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if (*((int *)addr) != 0)
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cdbg.flags = CAM_DEBUG_PERIPH;
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else
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cdbg.flags = CAM_DEBUG_NONE;
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xpt_setup_ccb(&cdbg.ccb_h, softc->path, /*priority*/0);
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cdbg.ccb_h.func_code = XPT_DEBUG;
|
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cdbg.ccb_h.cbfcnp = targdone;
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|
|
/* If no periph available, disallow debugging changes */
|
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TARG_LOCK(softc);
|
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if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
|
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status = CAM_DEV_NOT_THERE;
|
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TARG_UNLOCK(softc);
|
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break;
|
|
}
|
|
xpt_action((union ccb *)&cdbg);
|
|
TARG_UNLOCK(softc);
|
|
status = cdbg.ccb_h.status & CAM_STATUS_MASK;
|
|
#else
|
|
status = CAM_FUNC_NOTAVAIL;
|
|
#endif
|
|
break;
|
|
}
|
|
default:
|
|
status = CAM_PROVIDE_FAIL;
|
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break;
|
|
}
|
|
|
|
return (targcamstatus(status));
|
|
}
|
|
|
|
/* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
|
|
static int
|
|
targpoll(struct cdev *dev, int poll_events, struct thread *td)
|
|
{
|
|
struct targ_softc *softc;
|
|
int revents;
|
|
|
|
softc = (struct targ_softc *)dev->si_drv1;
|
|
|
|
/* Poll for write() is always ok. */
|
|
revents = poll_events & (POLLOUT | POLLWRNORM);
|
|
if ((poll_events & (POLLIN | POLLRDNORM)) != 0) {
|
|
/* Poll for read() depends on user and abort queues. */
|
|
TARG_LOCK(softc);
|
|
if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
|
|
!TAILQ_EMPTY(&softc->abort_queue)) {
|
|
revents |= poll_events & (POLLIN | POLLRDNORM);
|
|
}
|
|
/* Only sleep if the user didn't poll for write. */
|
|
if (revents == 0)
|
|
selrecord(td, &softc->read_select);
|
|
TARG_UNLOCK(softc);
|
|
}
|
|
|
|
return (revents);
|
|
}
|
|
|
|
static int
|
|
targkqfilter(struct cdev *dev, struct knote *kn)
|
|
{
|
|
struct targ_softc *softc;
|
|
|
|
softc = (struct targ_softc *)dev->si_drv1;
|
|
kn->kn_hook = (caddr_t)softc;
|
|
kn->kn_fop = &targread_filtops;
|
|
knlist_add(&softc->read_select.si_note, kn, 0);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
targreadfiltdetach(struct knote *kn)
|
|
{
|
|
struct targ_softc *softc;
|
|
|
|
softc = (struct targ_softc *)kn->kn_hook;
|
|
knlist_remove(&softc->read_select.si_note, kn, 0);
|
|
}
|
|
|
|
/* Notify the user's kqueue when the user queue or abort queue gets a CCB */
|
|
static int
|
|
targreadfilt(struct knote *kn, long hint)
|
|
{
|
|
struct targ_softc *softc;
|
|
int retval;
|
|
|
|
softc = (struct targ_softc *)kn->kn_hook;
|
|
retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
|
|
!TAILQ_EMPTY(&softc->abort_queue);
|
|
return (retval);
|
|
}
|
|
|
|
/* Send the HBA the enable/disable message */
|
|
static cam_status
|
|
targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
|
|
{
|
|
struct ccb_en_lun en_ccb;
|
|
cam_status status;
|
|
|
|
/* Tell the lun to begin answering selects */
|
|
xpt_setup_ccb(&en_ccb.ccb_h, path, /*priority*/1);
|
|
en_ccb.ccb_h.func_code = XPT_EN_LUN;
|
|
/* Don't need support for any vendor specific commands */
|
|
en_ccb.grp6_len = grp6_len;
|
|
en_ccb.grp7_len = grp7_len;
|
|
en_ccb.enable = enable ? 1 : 0;
|
|
xpt_action((union ccb *)&en_ccb);
|
|
status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
|
|
if (status != CAM_REQ_CMP) {
|
|
xpt_print_path(path);
|
|
printf("%sable lun CCB rejected, status %#x\n",
|
|
enable ? "en" : "dis", status);
|
|
}
|
|
return (status);
|
|
}
|
|
|
|
/* Enable target mode on a LUN, given its path */
|
|
static cam_status
|
|
targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
|
|
int grp7_len)
|
|
{
|
|
struct cam_periph *periph;
|
|
struct ccb_pathinq cpi;
|
|
cam_status status;
|
|
|
|
if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
|
|
return (CAM_LUN_ALRDY_ENA);
|
|
|
|
/* Make sure SIM supports target mode */
|
|
xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
|
|
cpi.ccb_h.func_code = XPT_PATH_INQ;
|
|
xpt_action((union ccb *)&cpi);
|
|
status = cpi.ccb_h.status & CAM_STATUS_MASK;
|
|
if (status != CAM_REQ_CMP) {
|
|
printf("pathinq failed, status %#x\n", status);
|
|
goto enable_fail;
|
|
}
|
|
if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
|
|
printf("controller does not support target mode\n");
|
|
status = CAM_FUNC_NOTAVAIL;
|
|
goto enable_fail;
|
|
}
|
|
|
|
/* Destroy any periph on our path if it is disabled */
|
|
mtx_lock(&targ_mtx);
|
|
periph = cam_periph_find(path, "targ");
|
|
if (periph != NULL) {
|
|
struct targ_softc *del_softc;
|
|
|
|
del_softc = (struct targ_softc *)periph->softc;
|
|
if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
|
|
cam_periph_invalidate(del_softc->periph);
|
|
del_softc->periph = NULL;
|
|
} else {
|
|
printf("Requested path still in use by targ%d\n",
|
|
periph->unit_number);
|
|
mtx_unlock(&targ_mtx);
|
|
status = CAM_LUN_ALRDY_ENA;
|
|
goto enable_fail;
|
|
}
|
|
}
|
|
|
|
/* Create a periph instance attached to this path */
|
|
status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
|
|
"targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
|
|
mtx_unlock(&targ_mtx);
|
|
if (status != CAM_REQ_CMP) {
|
|
printf("cam_periph_alloc failed, status %#x\n", status);
|
|
goto enable_fail;
|
|
}
|
|
|
|
/* Ensure that the periph now exists. */
|
|
if (cam_periph_find(path, "targ") == NULL) {
|
|
panic("targenable: succeeded but no periph?");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* Send the enable lun message */
|
|
status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
|
|
if (status != CAM_REQ_CMP) {
|
|
printf("enable lun failed, status %#x\n", status);
|
|
goto enable_fail;
|
|
}
|
|
softc->state |= TARG_STATE_LUN_ENABLED;
|
|
|
|
enable_fail:
|
|
return (status);
|
|
}
|
|
|
|
/* Disable this softc's target instance if enabled */
|
|
static cam_status
|
|
targdisable(struct targ_softc *softc)
|
|
{
|
|
cam_status status;
|
|
|
|
if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
|
|
return (CAM_REQ_CMP);
|
|
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
|
|
|
|
/* Abort any ccbs pending on the controller */
|
|
abort_all_pending(softc);
|
|
|
|
/* Disable this lun */
|
|
status = targendislun(softc->path, /*enable*/0,
|
|
/*grp6_len*/0, /*grp7_len*/0);
|
|
if (status == CAM_REQ_CMP)
|
|
softc->state &= ~TARG_STATE_LUN_ENABLED;
|
|
else
|
|
printf("Disable lun failed, status %#x\n", status);
|
|
|
|
return (status);
|
|
}
|
|
|
|
/* Initialize a periph (called from cam_periph_alloc) */
|
|
static cam_status
|
|
targctor(struct cam_periph *periph, void *arg)
|
|
{
|
|
struct targ_softc *softc;
|
|
|
|
/* Store pointer to softc for periph-driven routines */
|
|
softc = (struct targ_softc *)arg;
|
|
periph->softc = softc;
|
|
softc->periph = periph;
|
|
softc->path = periph->path;
|
|
return (CAM_REQ_CMP);
|
|
}
|
|
|
|
static void
|
|
targdtor(struct cam_periph *periph)
|
|
{
|
|
struct targ_softc *softc;
|
|
struct ccb_hdr *ccb_h;
|
|
struct targ_cmd_descr *descr;
|
|
|
|
softc = (struct targ_softc *)periph->softc;
|
|
|
|
/*
|
|
* targdisable() aborts CCBs back to the user and leaves them
|
|
* on user_ccb_queue and abort_queue in case the user is still
|
|
* interested in them. We free them now.
|
|
*/
|
|
while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
|
|
TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
|
|
targfreeccb(softc, (union ccb *)ccb_h);
|
|
}
|
|
while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
|
|
TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
|
|
FREE(descr, M_TARG);
|
|
}
|
|
|
|
softc->periph = NULL;
|
|
softc->path = NULL;
|
|
periph->softc = NULL;
|
|
}
|
|
|
|
/* Receive CCBs from user mode proc and send them to the HBA */
|
|
static int
|
|
targwrite(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
union ccb *user_ccb;
|
|
struct targ_softc *softc;
|
|
struct targ_cmd_descr *descr;
|
|
int write_len, error;
|
|
int func_code, priority;
|
|
|
|
softc = (struct targ_softc *)dev->si_drv1;
|
|
write_len = error = 0;
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("write - uio_resid %d\n", uio->uio_resid));
|
|
while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
|
|
union ccb *ccb;
|
|
int error;
|
|
|
|
error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
|
|
if (error != 0) {
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("write - uiomove failed (%d)\n", error));
|
|
break;
|
|
}
|
|
priority = fuword32(&user_ccb->ccb_h.pinfo.priority);
|
|
if (priority == -1) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
func_code = fuword32(&user_ccb->ccb_h.func_code);
|
|
switch (func_code) {
|
|
case XPT_ACCEPT_TARGET_IO:
|
|
case XPT_IMMED_NOTIFY:
|
|
ccb = targgetccb(softc, func_code, priority);
|
|
descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
|
|
descr->user_ccb = user_ccb;
|
|
descr->func_code = func_code;
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("Sent ATIO/INOT (%p)\n", user_ccb));
|
|
xpt_action(ccb);
|
|
TARG_LOCK(softc);
|
|
TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
|
|
&ccb->ccb_h,
|
|
periph_links.tqe);
|
|
TARG_UNLOCK(softc);
|
|
break;
|
|
default:
|
|
if ((func_code & XPT_FC_QUEUED) != 0) {
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("Sending queued ccb %#x (%p)\n",
|
|
func_code, user_ccb));
|
|
descr = targgetdescr(softc);
|
|
descr->user_ccb = user_ccb;
|
|
descr->priority = priority;
|
|
descr->func_code = func_code;
|
|
TARG_LOCK(softc);
|
|
TAILQ_INSERT_TAIL(&softc->work_queue,
|
|
descr, tqe);
|
|
TARG_UNLOCK(softc);
|
|
xpt_schedule(softc->periph, priority);
|
|
} else {
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("Sending inline ccb %#x (%p)\n",
|
|
func_code, user_ccb));
|
|
ccb = targgetccb(softc, func_code, priority);
|
|
descr = (struct targ_cmd_descr *)
|
|
ccb->ccb_h.targ_descr;
|
|
descr->user_ccb = user_ccb;
|
|
descr->priority = priority;
|
|
descr->func_code = func_code;
|
|
if (targusermerge(softc, descr, ccb) != EFAULT)
|
|
targsendccb(softc, ccb, descr);
|
|
targreturnccb(softc, ccb);
|
|
}
|
|
break;
|
|
}
|
|
write_len += sizeof(user_ccb);
|
|
}
|
|
|
|
/*
|
|
* If we've successfully taken in some amount of
|
|
* data, return success for that data first. If
|
|
* an error is persistent, it will be reported
|
|
* on the next write.
|
|
*/
|
|
if (error != 0 && write_len == 0)
|
|
return (error);
|
|
if (write_len == 0 && uio->uio_resid != 0)
|
|
return (ENOSPC);
|
|
return (0);
|
|
}
|
|
|
|
/* Process requests (descrs) via the periph-supplied CCBs */
|
|
static void
|
|
targstart(struct cam_periph *periph, union ccb *start_ccb)
|
|
{
|
|
struct targ_softc *softc;
|
|
struct targ_cmd_descr *descr, *next_descr;
|
|
int error;
|
|
|
|
softc = (struct targ_softc *)periph->softc;
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
|
|
|
|
TARG_LOCK(softc);
|
|
descr = TAILQ_FIRST(&softc->work_queue);
|
|
if (descr == NULL) {
|
|
TARG_UNLOCK(softc);
|
|
xpt_release_ccb(start_ccb);
|
|
} else {
|
|
TAILQ_REMOVE(&softc->work_queue, descr, tqe);
|
|
next_descr = TAILQ_FIRST(&softc->work_queue);
|
|
TARG_UNLOCK(softc);
|
|
|
|
/* Initiate a transaction using the descr and supplied CCB */
|
|
error = targusermerge(softc, descr, start_ccb);
|
|
if (error == 0)
|
|
error = targsendccb(softc, start_ccb, descr);
|
|
if (error != 0) {
|
|
xpt_print_path(periph->path);
|
|
printf("targsendccb failed, err %d\n", error);
|
|
xpt_release_ccb(start_ccb);
|
|
suword(&descr->user_ccb->ccb_h.status,
|
|
CAM_REQ_CMP_ERR);
|
|
TARG_LOCK(softc);
|
|
TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
|
|
TARG_UNLOCK(softc);
|
|
notify_user(softc);
|
|
}
|
|
|
|
/* If we have more work to do, stay scheduled */
|
|
if (next_descr != NULL)
|
|
xpt_schedule(periph, next_descr->priority);
|
|
}
|
|
}
|
|
|
|
static int
|
|
targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
|
|
union ccb *ccb)
|
|
{
|
|
struct ccb_hdr *u_ccbh, *k_ccbh;
|
|
size_t ccb_len;
|
|
int error;
|
|
|
|
u_ccbh = &descr->user_ccb->ccb_h;
|
|
k_ccbh = &ccb->ccb_h;
|
|
|
|
/*
|
|
* There are some fields in the CCB header that need to be
|
|
* preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
|
|
*/
|
|
xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
|
|
k_ccbh->retry_count = fuword32(&u_ccbh->retry_count);
|
|
k_ccbh->func_code = descr->func_code;
|
|
k_ccbh->flags = fuword32(&u_ccbh->flags);
|
|
k_ccbh->timeout = fuword32(&u_ccbh->timeout);
|
|
ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
|
|
error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
|
|
if (error != 0) {
|
|
k_ccbh->status = CAM_REQ_CMP_ERR;
|
|
return (error);
|
|
}
|
|
|
|
/* Translate usermode abort_ccb pointer to its kernel counterpart */
|
|
if (k_ccbh->func_code == XPT_ABORT) {
|
|
struct ccb_abort *cab;
|
|
struct ccb_hdr *ccb_h;
|
|
|
|
cab = (struct ccb_abort *)ccb;
|
|
TARG_LOCK(softc);
|
|
TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
|
|
periph_links.tqe) {
|
|
struct targ_cmd_descr *ab_descr;
|
|
|
|
ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
|
|
if (ab_descr->user_ccb == cab->abort_ccb) {
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("Changing abort for %p to %p\n",
|
|
cab->abort_ccb, ccb_h));
|
|
cab->abort_ccb = (union ccb *)ccb_h;
|
|
break;
|
|
}
|
|
}
|
|
TARG_UNLOCK(softc);
|
|
/* CCB not found, set appropriate status */
|
|
if (ccb_h == NULL) {
|
|
k_ccbh->status = CAM_PATH_INVALID;
|
|
error = ESRCH;
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* Build and send a kernel CCB formed from descr->user_ccb */
|
|
static int
|
|
targsendccb(struct targ_softc *softc, union ccb *ccb,
|
|
struct targ_cmd_descr *descr)
|
|
{
|
|
struct cam_periph_map_info *mapinfo;
|
|
struct ccb_hdr *ccb_h;
|
|
int error;
|
|
|
|
ccb_h = &ccb->ccb_h;
|
|
mapinfo = &descr->mapinfo;
|
|
mapinfo->num_bufs_used = 0;
|
|
|
|
/*
|
|
* There's no way for the user to have a completion
|
|
* function, so we put our own completion function in here.
|
|
* We also stash in a reference to our descriptor so targreturnccb()
|
|
* can find our mapping info.
|
|
*/
|
|
ccb_h->cbfcnp = targdone;
|
|
ccb_h->targ_descr = descr;
|
|
|
|
/*
|
|
* We only attempt to map the user memory into kernel space
|
|
* if they haven't passed in a physical memory pointer,
|
|
* and if there is actually an I/O operation to perform.
|
|
* Right now cam_periph_mapmem() only supports SCSI and device
|
|
* match CCBs. For the SCSI CCBs, we only pass the CCB in if
|
|
* there's actually data to map. cam_periph_mapmem() will do the
|
|
* right thing, even if there isn't data to map, but since CCBs
|
|
* without data are a reasonably common occurance (e.g. test unit
|
|
* ready), it will save a few cycles if we check for it here.
|
|
*/
|
|
if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
|
|
&& (((ccb_h->func_code == XPT_CONT_TARGET_IO)
|
|
&& ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
|
|
|| (ccb_h->func_code == XPT_DEV_MATCH))) {
|
|
|
|
error = cam_periph_mapmem(ccb, mapinfo);
|
|
|
|
/*
|
|
* cam_periph_mapmem returned an error, we can't continue.
|
|
* Return the error to the user.
|
|
*/
|
|
if (error) {
|
|
ccb_h->status = CAM_REQ_CMP_ERR;
|
|
mapinfo->num_bufs_used = 0;
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Once queued on the pending CCB list, this CCB will be protected
|
|
* by our error recovery handler.
|
|
*/
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
|
|
if (XPT_FC_IS_QUEUED(ccb)) {
|
|
TARG_LOCK(softc);
|
|
TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
|
|
periph_links.tqe);
|
|
TARG_UNLOCK(softc);
|
|
}
|
|
xpt_action(ccb);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Completion routine for CCBs (called at splsoftcam) */
|
|
static void
|
|
targdone(struct cam_periph *periph, union ccb *done_ccb)
|
|
{
|
|
struct targ_softc *softc;
|
|
cam_status status;
|
|
|
|
CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
|
|
softc = (struct targ_softc *)periph->softc;
|
|
TARG_LOCK(softc);
|
|
TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
|
|
periph_links.tqe);
|
|
status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
|
|
|
|
/* If we're no longer enabled, throw away CCB */
|
|
if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
|
|
targfreeccb(softc, done_ccb);
|
|
TARG_UNLOCK(softc);
|
|
return;
|
|
}
|
|
/* abort_all_pending() waits for pending queue to be empty */
|
|
if (TAILQ_EMPTY(&softc->pending_ccb_queue))
|
|
wakeup(&softc->pending_ccb_queue);
|
|
|
|
switch (done_ccb->ccb_h.func_code) {
|
|
/* All FC_*_QUEUED CCBs go back to userland */
|
|
case XPT_IMMED_NOTIFY:
|
|
case XPT_ACCEPT_TARGET_IO:
|
|
case XPT_CONT_TARGET_IO:
|
|
TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
|
|
periph_links.tqe);
|
|
TARG_UNLOCK(softc);
|
|
notify_user(softc);
|
|
break;
|
|
default:
|
|
panic("targdone: impossible xpt opcode %#x",
|
|
done_ccb->ccb_h.func_code);
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
|
|
/* Return CCBs to the user from the user queue and abort queue */
|
|
static int
|
|
targread(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct descr_queue *abort_queue;
|
|
struct targ_cmd_descr *user_descr;
|
|
struct targ_softc *softc;
|
|
struct ccb_queue *user_queue;
|
|
struct ccb_hdr *ccb_h;
|
|
union ccb *user_ccb;
|
|
int read_len, error;
|
|
|
|
error = 0;
|
|
read_len = 0;
|
|
softc = (struct targ_softc *)dev->si_drv1;
|
|
user_queue = &softc->user_ccb_queue;
|
|
abort_queue = &softc->abort_queue;
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
|
|
|
|
/* If no data is available, wait or return immediately */
|
|
TARG_LOCK(softc);
|
|
ccb_h = TAILQ_FIRST(user_queue);
|
|
user_descr = TAILQ_FIRST(abort_queue);
|
|
while (ccb_h == NULL && user_descr == NULL) {
|
|
if ((ioflag & IO_NDELAY) == 0) {
|
|
error = msleep(user_queue, &softc->mtx,
|
|
PRIBIO | PCATCH, "targrd", 0);
|
|
ccb_h = TAILQ_FIRST(user_queue);
|
|
user_descr = TAILQ_FIRST(abort_queue);
|
|
if (error != 0) {
|
|
if (error == ERESTART) {
|
|
continue;
|
|
} else {
|
|
TARG_UNLOCK(softc);
|
|
goto read_fail;
|
|
}
|
|
}
|
|
} else {
|
|
TARG_UNLOCK(softc);
|
|
return (EAGAIN);
|
|
}
|
|
}
|
|
|
|
/* Data is available so fill the user's buffer */
|
|
while (ccb_h != NULL) {
|
|
struct targ_cmd_descr *descr;
|
|
|
|
if (uio->uio_resid < sizeof(user_ccb))
|
|
break;
|
|
TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
|
|
TARG_UNLOCK(softc);
|
|
descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
|
|
user_ccb = descr->user_ccb;
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("targread ccb %p (%p)\n", ccb_h, user_ccb));
|
|
error = targreturnccb(softc, (union ccb *)ccb_h);
|
|
if (error != 0)
|
|
goto read_fail;
|
|
error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
|
|
if (error != 0)
|
|
goto read_fail;
|
|
read_len += sizeof(user_ccb);
|
|
|
|
TARG_LOCK(softc);
|
|
ccb_h = TAILQ_FIRST(user_queue);
|
|
}
|
|
|
|
/* Flush out any aborted descriptors */
|
|
while (user_descr != NULL) {
|
|
if (uio->uio_resid < sizeof(user_ccb))
|
|
break;
|
|
TAILQ_REMOVE(abort_queue, user_descr, tqe);
|
|
TARG_UNLOCK(softc);
|
|
user_ccb = user_descr->user_ccb;
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("targread aborted descr %p (%p)\n",
|
|
user_descr, user_ccb));
|
|
suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
|
|
error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
|
|
if (error != 0)
|
|
goto read_fail;
|
|
read_len += sizeof(user_ccb);
|
|
|
|
TARG_LOCK(softc);
|
|
user_descr = TAILQ_FIRST(abort_queue);
|
|
}
|
|
TARG_UNLOCK(softc);
|
|
|
|
/*
|
|
* If we've successfully read some amount of data, don't report an
|
|
* error. If the error is persistent, it will be reported on the
|
|
* next read().
|
|
*/
|
|
if (read_len == 0 && uio->uio_resid != 0)
|
|
error = ENOSPC;
|
|
|
|
read_fail:
|
|
return (error);
|
|
}
|
|
|
|
/* Copy completed ccb back to the user */
|
|
static int
|
|
targreturnccb(struct targ_softc *softc, union ccb *ccb)
|
|
{
|
|
struct targ_cmd_descr *descr;
|
|
struct ccb_hdr *u_ccbh;
|
|
size_t ccb_len;
|
|
int error;
|
|
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
|
|
descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
|
|
u_ccbh = &descr->user_ccb->ccb_h;
|
|
|
|
/* Copy out the central portion of the ccb_hdr */
|
|
copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
|
|
offsetof(struct ccb_hdr, periph_priv) -
|
|
offsetof(struct ccb_hdr, retry_count));
|
|
|
|
/* Copy out the rest of the ccb (after the ccb_hdr) */
|
|
ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
|
|
if (descr->mapinfo.num_bufs_used != 0)
|
|
cam_periph_unmapmem(ccb, &descr->mapinfo);
|
|
error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
|
|
if (error != 0) {
|
|
xpt_print_path(softc->path);
|
|
printf("targreturnccb - CCB copyout failed (%d)\n",
|
|
error);
|
|
}
|
|
/* Free CCB or send back to devq. */
|
|
targfreeccb(softc, ccb);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static union ccb *
|
|
targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
|
|
{
|
|
union ccb *ccb;
|
|
int ccb_len;
|
|
|
|
ccb_len = targccblen(type);
|
|
MALLOC(ccb, union ccb *, ccb_len, M_TARG, M_WAITOK);
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
|
|
|
|
xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
|
|
ccb->ccb_h.func_code = type;
|
|
ccb->ccb_h.cbfcnp = targdone;
|
|
ccb->ccb_h.targ_descr = targgetdescr(softc);
|
|
return (ccb);
|
|
}
|
|
|
|
static void
|
|
targfreeccb(struct targ_softc *softc, union ccb *ccb)
|
|
{
|
|
CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
|
|
ccb->ccb_h.targ_descr));
|
|
FREE(ccb->ccb_h.targ_descr, M_TARG);
|
|
|
|
switch (ccb->ccb_h.func_code) {
|
|
case XPT_ACCEPT_TARGET_IO:
|
|
case XPT_IMMED_NOTIFY:
|
|
CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
|
|
FREE(ccb, M_TARG);
|
|
break;
|
|
default:
|
|
/* Send back CCB if we got it from the periph */
|
|
if (XPT_FC_IS_QUEUED(ccb)) {
|
|
CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
|
|
("returning queued ccb %p\n", ccb));
|
|
xpt_release_ccb(ccb);
|
|
} else {
|
|
CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
|
|
("freeing ccb %p\n", ccb));
|
|
FREE(ccb, M_TARG);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct targ_cmd_descr *
|
|
targgetdescr(struct targ_softc *softc)
|
|
{
|
|
struct targ_cmd_descr *descr;
|
|
|
|
MALLOC(descr, struct targ_cmd_descr *, sizeof(*descr), M_TARG,
|
|
M_WAITOK);
|
|
descr->mapinfo.num_bufs_used = 0;
|
|
return (descr);
|
|
}
|
|
|
|
static void
|
|
targinit(void)
|
|
{
|
|
mtx_init(&targ_mtx, "targ global", NULL, MTX_DEF);
|
|
EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000);
|
|
}
|
|
|
|
static void
|
|
targclone(void *arg, char *name, int namelen, struct cdev **dev)
|
|
{
|
|
int u;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
if (dev_stdclone(name, NULL, "targ", &u) != 1)
|
|
return;
|
|
*dev = make_dev(&targ_cdevsw, unit2minor(u), UID_ROOT, GID_WHEEL,
|
|
0600, "targ%d", u);
|
|
(*dev)->si_flags |= SI_CHEAPCLONE;
|
|
}
|
|
|
|
static void
|
|
targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
|
|
{
|
|
/* All events are handled in usermode by INOTs */
|
|
panic("targasync() called, should be an INOT instead");
|
|
}
|
|
|
|
/* Cancel all pending requests and CCBs awaiting work. */
|
|
static void
|
|
abort_all_pending(struct targ_softc *softc)
|
|
{
|
|
struct targ_cmd_descr *descr;
|
|
struct ccb_abort cab;
|
|
struct ccb_hdr *ccb_h;
|
|
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n"));
|
|
|
|
/* First abort the descriptors awaiting resources */
|
|
while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) {
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("Aborting descr from workq %p\n", descr));
|
|
TAILQ_REMOVE(&softc->work_queue, descr, tqe);
|
|
TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
|
|
}
|
|
|
|
/*
|
|
* Then abort all pending CCBs.
|
|
* targdone() will return the aborted CCB via user_ccb_queue
|
|
*/
|
|
xpt_setup_ccb(&cab.ccb_h, softc->path, /*priority*/0);
|
|
cab.ccb_h.func_code = XPT_ABORT;
|
|
cab.ccb_h.status = CAM_REQ_CMP_ERR;
|
|
TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) {
|
|
CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
|
|
("Aborting pending CCB %p\n", ccb_h));
|
|
cab.abort_ccb = (union ccb *)ccb_h;
|
|
xpt_action((union ccb *)&cab);
|
|
if (cab.ccb_h.status != CAM_REQ_CMP) {
|
|
xpt_print_path(cab.ccb_h.path);
|
|
printf("Unable to abort CCB, status %#x\n",
|
|
cab.ccb_h.status);
|
|
}
|
|
}
|
|
|
|
/* If we aborted at least one pending CCB ok, wait for it. */
|
|
if (cab.ccb_h.status == CAM_REQ_CMP) {
|
|
msleep(&softc->pending_ccb_queue, &softc->mtx,
|
|
PRIBIO | PCATCH, "tgabrt", 0);
|
|
}
|
|
|
|
/* If we aborted anything from the work queue, wakeup user. */
|
|
if (!TAILQ_EMPTY(&softc->user_ccb_queue)
|
|
|| !TAILQ_EMPTY(&softc->abort_queue))
|
|
notify_user(softc);
|
|
}
|
|
|
|
/* Notify the user that data is ready */
|
|
static void
|
|
notify_user(struct targ_softc *softc)
|
|
{
|
|
/*
|
|
* Notify users sleeping via poll(), kqueue(), and
|
|
* blocking read().
|
|
*/
|
|
selwakeuppri(&softc->read_select, PRIBIO);
|
|
KNOTE_LOCKED(&softc->read_select.si_note, 0);
|
|
wakeup(&softc->user_ccb_queue);
|
|
}
|
|
|
|
/* Convert CAM status to errno values */
|
|
static int
|
|
targcamstatus(cam_status status)
|
|
{
|
|
switch (status & CAM_STATUS_MASK) {
|
|
case CAM_REQ_CMP: /* CCB request completed without error */
|
|
return (0);
|
|
case CAM_REQ_INPROG: /* CCB request is in progress */
|
|
return (EINPROGRESS);
|
|
case CAM_REQ_CMP_ERR: /* CCB request completed with an error */
|
|
return (EIO);
|
|
case CAM_PROVIDE_FAIL: /* Unable to provide requested capability */
|
|
return (ENOTTY);
|
|
case CAM_FUNC_NOTAVAIL: /* The requested function is not available */
|
|
return (ENOTSUP);
|
|
case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */
|
|
return (EADDRINUSE);
|
|
case CAM_PATH_INVALID: /* Supplied Path ID is invalid */
|
|
case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */
|
|
return (ENOENT);
|
|
case CAM_REQ_ABORTED: /* CCB request aborted by the host */
|
|
return (ECANCELED);
|
|
case CAM_CMD_TIMEOUT: /* Command timeout */
|
|
return (ETIMEDOUT);
|
|
case CAM_REQUEUE_REQ: /* Requeue to preserve transaction ordering */
|
|
return (EAGAIN);
|
|
case CAM_REQ_INVALID: /* CCB request was invalid */
|
|
return (EINVAL);
|
|
case CAM_RESRC_UNAVAIL: /* Resource Unavailable */
|
|
return (ENOMEM);
|
|
case CAM_BUSY: /* CAM subsytem is busy */
|
|
case CAM_UA_ABORT: /* Unable to abort CCB request */
|
|
return (EBUSY);
|
|
default:
|
|
return (ENXIO);
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
targccblen(xpt_opcode func_code)
|
|
{
|
|
int len;
|
|
|
|
/* Codes we expect to see as a target */
|
|
switch (func_code) {
|
|
case XPT_CONT_TARGET_IO:
|
|
case XPT_SCSI_IO:
|
|
len = sizeof(struct ccb_scsiio);
|
|
break;
|
|
case XPT_ACCEPT_TARGET_IO:
|
|
len = sizeof(struct ccb_accept_tio);
|
|
break;
|
|
case XPT_IMMED_NOTIFY:
|
|
len = sizeof(struct ccb_immed_notify);
|
|
break;
|
|
case XPT_REL_SIMQ:
|
|
len = sizeof(struct ccb_relsim);
|
|
break;
|
|
case XPT_PATH_INQ:
|
|
len = sizeof(struct ccb_pathinq);
|
|
break;
|
|
case XPT_DEBUG:
|
|
len = sizeof(struct ccb_debug);
|
|
break;
|
|
case XPT_ABORT:
|
|
len = sizeof(struct ccb_abort);
|
|
break;
|
|
case XPT_EN_LUN:
|
|
len = sizeof(struct ccb_en_lun);
|
|
break;
|
|
default:
|
|
len = sizeof(union ccb);
|
|
break;
|
|
}
|
|
|
|
return (len);
|
|
}
|