usr/src/cmd/devfsadm/tape_link.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <devfsadm.h>
  29 #include <strings.h>
  30 #include <stdlib.h>
  31 #include <limits.h>
  32 #include <bsm/devalloc.h>
  33
  34 extern int system_labeled;
  35
  36 static int tape_process(di_minor_t minor, di_node_t node);
  37
  38 static devfsadm_create_t tape_cbt[] = {
  39         { "tape", "ddi_byte:tape", NULL,
  40         TYPE_EXACT, ILEVEL_0,   tape_process
  41         },
  42 };
  43
  44 DEVFSADM_CREATE_INIT_V0(tape_cbt);
  45
  46 #define TAPE_LINK_RE "^rmt/[0-9]+[cbhlmnu]*"
  47
  48 static devfsadm_remove_t tape_remove_cbt[] = {
  49         { "tape", TAPE_LINK_RE, RM_PRE, ILEVEL_0, devfsadm_rm_all
  50         }
  51 };
  52
  53 DEVFSADM_REMOVE_INIT_V0(tape_remove_cbt);
  54
  55
  56 /*
  57  * This function is called for every tape minor node.
  58  * Calls enumerate to assign a logical tape id, and then
  59  * devfsadm_mklink to make the link.
  60  */
  61 static int
  62 tape_process(di_minor_t minor, di_node_t node)
  63 {
  64         int flags = 0;
  65         char l_path[PATH_MAX + 1];
  66         char *buf;
  67         char *mn;
  68         char *devfspath;
  69         devfsadm_enumerate_t rules[1] = {"rmt/([0-9]+)", 1, MATCH_ADDR};
  70
  71         mn = di_minor_name(minor);
  72
  73
  74         if ((mn != NULL) && (*mn >= '0') && (*mn <= '9')) {
  75                 /*
  76                  * first character cannot be a digit as it would combine
  77                  * with the tape instance number to make an ambiguous quantity.
  78                  */
  79                 return (DEVFSADM_CONTINUE);
  80         }
  81
  82         devfspath = di_devfs_path(node);
  83
  84         (void) strcpy(l_path, devfspath);
  85         (void) strcat(l_path, ":");
  86         (void) strcat(l_path, mn);
  87
  88         di_devfs_path_free(devfspath);
  89
  90         /*
  91          *  devfsadm_enumerate finds the logical tape id from the physical path,
  92          *  omitting minor name field. The logical tape id is returned in buf.
  93          */
  94         if (devfsadm_enumerate_int(l_path, 0, &buf, rules, 1)) {
  95                 return (DEVFSADM_CONTINUE);
  96         }
  97
  98         (void) strcpy(l_path, "rmt/");
  99         (void) strcat(l_path, buf);
 100         (void) strcat(l_path, mn);
 101         free(buf);
 102
 103         if (system_labeled)
 104                 flags = DA_ADD|DA_TAPE;
 105
 106         (void) devfsadm_mklink(l_path, node, minor, flags);
 107
 108         return (DEVFSADM_CONTINUE);
 109 }