usr/src/cmd/devfsadm/fssnap_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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2000-2001 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <regex.h>
  30 #include <devfsadm.h>
  31 #include <stdio.h>
  32 #include <strings.h>
  33 #include <stdlib.h>
  34 #include <limits.h>
  35 #include <sys/fssnap_if.h>
  36
  37
  38 static int fssnap(di_minor_t minor, di_node_t node);
  39
  40 static devfsadm_create_t fssnap_cbt[] = {
  41         { "pseudo", "ddi_pseudo", SNAP_NAME,
  42             TYPE_EXACT | DRV_EXACT, ILEVEL_0, fssnap,
  43         },
  44 };
  45
  46 DEVFSADM_CREATE_INIT_V0(fssnap_cbt);
  47
  48 /*
  49  * For the master device:
  50  *      /dev/fssnapctl -> /devices/pseudo/fssnap@0:ctl
  51  * For each other device
  52  *      /dev/fssnap/1 -> /devices/pseudo/fssnap@0:1
  53  *      /dev/rfssnap/1 -> /devices/pseudo/fssnap@0:1,raw
  54  */
  55 static int
  56 fssnap(di_minor_t minor, di_node_t node)
  57 {
  58         dev_t   dev;
  59         char mn[MAXNAMELEN + 1];
  60         char blkname[MAXNAMELEN + 1];
  61         char rawname[MAXNAMELEN + 1];
  62         char path[PATH_MAX + 1];
  63
  64         (void) strcpy(mn, di_minor_name(minor));
  65
  66         if (strcmp(mn, "ctl") == 0) {
  67                 (void) devfsadm_mklink(SNAP_CTL_NAME, node, minor, 0);
  68         } else {
  69                 dev = di_minor_devt(minor);
  70                 (void) snprintf(blkname, sizeof (blkname), "%d",
  71                     (int)minor(dev));
  72                 (void) snprintf(rawname, sizeof (rawname), "%d,raw",
  73                     (int)minor(dev));
  74
  75                 if (strcmp(mn, blkname) == 0) {
  76                         (void) snprintf(path, sizeof (path), "%s/%s",
  77                             SNAP_BLOCK_NAME, blkname);
  78                 } else if (strcmp(mn, rawname) == 0) {
  79                         (void) snprintf(path, sizeof (path), "%s/%s",
  80                             SNAP_CHAR_NAME, blkname);
  81                 } else {
  82                         return (DEVFSADM_CONTINUE);
  83                 }
  84
  85                 (void) devfsadm_mklink(path, node, minor, 0);
  86         }
  87         return (DEVFSADM_CONTINUE);
  88 }