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 static int tape_process(di_minor_t minor, di_node_t node);
  35
  36 static devfsadm_create_t tape_cbt[] = {
  37         { "tape", "ddi_byte:tape", NULL,
  38         TYPE_EXACT, ILEVEL_0,   tape_process
  39         },
  40 };
  41
  42 DEVFSADM_CREATE_INIT_V0(tape_cbt);
  43
  44 #define TAPE_LINK_RE "^rmt/[0-9]+[cbhlmnu]*"
  45
  46 static devfsadm_remove_t tape_remove_cbt[] = {
  47         { "tape", TAPE_LINK_RE, RM_PRE, ILEVEL_0, devfsadm_rm_all
  48         }
  49 };
  50
  51 DEVFSADM_REMOVE_INIT_V0(tape_remove_cbt);
  52
  53
  54 /*
  55  * This function is called for every tape minor node.
  56  * Calls enumerate to assign a logical tape id, and then
  57  * devfsadm_mklink to make the link.
  58  */
  59 static int
  60 tape_process(di_minor_t minor, di_node_t node)
  61 {
  62         int flags = 0;
  63         char l_path[PATH_MAX + 1];
  64         char *buf;
  65         char *mn;
  66         char *devfspath;
  67         devfsadm_enumerate_t rules[1] = {"rmt/([0-9]+)", 1, MATCH_ADDR};
  68
  69         mn = di_minor_name(minor);
  70
  71
  72         if ((mn != NULL) && (*mn >= '0') && (*mn <= '9')) {
  73                 /*
  74                  * first character cannot be a digit as it would combine
  75                  * with the tape instance number to make an ambiguous quantity.
  76                  */
  77                 return (DEVFSADM_CONTINUE);
  78         }
  79
  80         devfspath = di_devfs_path(node);
  81
  82         (void) strcpy(l_path, devfspath);
  83         (void) strcat(l_path, ":");
  84         (void) strcat(l_path, mn);
  85
  86         di_devfs_path_free(devfspath);
  87
  88         /*
  89          *  devfsadm_enumerate finds the logical tape id from the physical path,
  90          *  omitting minor name field. The logical tape id is returned in buf.
  91          */
  92         if (devfsadm_enumerate_int(l_path, 0, &buf, rules, 1)) {
  93                 return (DEVFSADM_CONTINUE);
  94         }
  95
  96         (void) strcpy(l_path, "rmt/");
  97         (void) strcat(l_path, buf);
  98         (void) strcat(l_path, mn);
  99         free(buf);
 100
 101         (void) devfsadm_mklink(l_path, node, minor, flags);
 102
 103         return (DEVFSADM_CONTINUE);
 104 }