cmd/devfsadm/sgen_link.c

	sgen_link.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <devfsadm.h>
#include <stdio.h>
#include <strings.h>
#include <stdlib.h>
#include <limits.h>
#include <ctype.h>

#define SGEN_LINK_RE    "^scsi/.+/c[0-9]+t[0-9A-F]+d[0-9]+$"
#define SGEN_DIR    "scsi"
#define SGEN_CLASS  "generic-scsi"

static int sgen_callback(di_minor_t minor, di_node_t node);
static char *find_ctrlr(di_node_t node, di_minor_t minor);


static devfsadm_create_t sgen_create_cbt[] = {
    { SGEN_CLASS, "ddi_generic:scsi", NULL,
        TYPE_EXACT | CREATE_DEFER, ILEVEL_0, sgen_callback
    }
};

DEVFSADM_CREATE_INIT_V0(sgen_create_cbt);

/*
 * HOT auto cleanup of sgen links not desired.
 */
static devfsadm_remove_t sgen_remove_cbt[] = {
    { SGEN_CLASS, SGEN_LINK_RE, RM_POST,
        ILEVEL_0, devfsadm_rm_all
    }
};

DEVFSADM_REMOVE_INIT_V0(sgen_remove_cbt);

static int
sgen_callback(di_minor_t minor, di_node_t node)
{
    char *baddr, *cnum, *tstr;
    char lpath[PATH_MAX], buf[PATH_MAX];
    uchar_t *wwn;

    if ((cnum = find_ctrlr(node, minor)) == NULL)
        goto done;

    if (di_prop_lookup_strings(DDI_DEV_T_ANY, node,
        "client-guid", (char **)&wwn) > 0) {
        /*
         * MPXIO-enabled devices; lun is always 0.
         */
        if (strlcpy((char *)buf, (char *)wwn, sizeof (buf)) >=
            sizeof (buf))
            goto done;

        for (tstr = buf; *tstr != '\0'; tstr++) {
            *tstr = toupper(*tstr);
        }
        if (snprintf(lpath, sizeof (lpath), "%s/%s/c%st%sd0", SGEN_DIR,
            di_minor_name(minor), cnum, buf) >= sizeof (lpath))
            goto done;

    } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node,
        "port-wwn", &wwn) == 8) {
        /*
         * "normal" fibre channel devices
         */
        int lun, *lunp, count;
        if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "lun", &lunp) > 0)
            lun = *lunp;
        else
            lun = 0;

        for (count = 0, tstr = buf; count < 8; count++, tstr += 2)
            (void) sprintf(tstr, "%02X", wwn[count]);

        *tstr = '\0';
        if (snprintf(lpath, sizeof (lpath), "%s/%s/c%st%sd%d", SGEN_DIR,
            di_minor_name(minor), cnum, buf, lun) >= sizeof (lpath))
            goto done;
    } else {
        /*
         * Parallel SCSI devices
         */
        uint_t targ, lun;

        if ((baddr = di_bus_addr(node)) == NULL)
            goto done;

        if (sscanf(baddr, "%X,%X", &targ, &lun) != 2)
            goto done;

        if (snprintf(lpath, sizeof (lpath), "%s/%s/c%st%dd%d", SGEN_DIR,
            di_minor_name(minor), cnum, targ, lun) >= sizeof (lpath))
            goto done;
    }

    (void) devfsadm_mklink(lpath, node, minor, 0);
done:
    free(cnum);
    return (DEVFSADM_CONTINUE);
}

/* index of enumeration rule applicable to this module */
#define RULE_INDEX  2

static char *
find_ctrlr(di_node_t node, di_minor_t minor)
{
    char path[PATH_MAX + 1];
    char *devfspath;
    char *buf, *mn;

    devfsadm_enumerate_t rules[3] = {
        {"^r?dsk$/^c([0-9]+)", 1, MATCH_PARENT},
        {"^cfg$/^c([0-9]+)$", 1, MATCH_ADDR},
        {"^scsi$/^.+$/^c([0-9]+)", 1, MATCH_PARENT}
    };

    mn = di_minor_name(minor);

    if ((devfspath = di_devfs_path(node)) == NULL) {
        return (NULL);
    }
    (void) strcpy(path, devfspath);
    (void) strcat(path, ":");
    (void) strcat(path, mn);
    di_devfs_path_free(devfspath);

    /*
     * Use controller (parent) component of device path
     */
    if (disk_enumerate_int(path, RULE_INDEX, &buf, rules, 3) ==
        DEVFSADM_MULTIPLE) {

        /*
         * We failed because there are multiple logical controller
         * numbers for a single physical controller.  If we use node
         * name also for DEVICE paths in the match it should fix this
         * and only find one logical controller. (See 4045879).
         * NOTE: Rules for controllers are not changed, as there is
         * no unique controller number for them in this case.
         *
         * MATCH_UNCACHED flag is private to the "disks" and "sgen"
         * modules. NOT to be used by other modules.
         */
        rules[0].flags = MATCH_NODE | MATCH_UNCACHED; /* disks */
        rules[2].flags = MATCH_NODE | MATCH_UNCACHED; /* generic scsi */
        if (devfsadm_enumerate_int(path, RULE_INDEX, &buf, rules, 3)) {
            return (NULL);
        }
    }

    return (buf);
}