external/bsd/am-utils/dist/amd/amfs_auto.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1997-2009 Erez Zadok
   5  * Copyright (c) 1990 Jan-Simon Pendry
   6  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   7  * Copyright (c) 1990 The Regents of the University of California.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Jan-Simon Pendry at Imperial College, London.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgment:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *
  42  * File: am-utils/amd/amfs_auto.c
  43  *
  44  */
  45
  46 /*
  47  * Automount file system
  48  */
  49
  50 #ifdef HAVE_CONFIG_H
  51 # include <config.h>
  52 #endif /* HAVE_CONFIG_H */
  53 #include <am_defs.h>
  54 #include <amd.h>
  55
  56 /****************************************************************************
  57  *** MACROS                                                               ***
  58  ****************************************************************************/
  59
  60
  61 /****************************************************************************
  62  *** STRUCTURES                                                           ***
  63  ****************************************************************************/
  64
  65
  66 /****************************************************************************
  67  *** FORWARD DEFINITIONS                                                  ***
  68  ****************************************************************************/
  69 static int amfs_auto_mount(am_node *mp, mntfs *mf);
  70
  71
  72 /****************************************************************************
  73  *** OPS STRUCTURES                                                       ***
  74  ****************************************************************************/
  75 am_ops amfs_auto_ops =
  76 {
  77   "auto",
  78   amfs_generic_match,
  79   0,                            /* amfs_auto_init */
  80   amfs_auto_mount,
  81   amfs_generic_umount,
  82   amfs_generic_lookup_child,
  83   amfs_generic_mount_child,
  84   amfs_generic_readdir,
  85   0,                            /* amfs_auto_readlink */
  86   amfs_generic_mounted,
  87   0,                            /* amfs_auto_umounted */
  88   amfs_generic_find_srvr,
  89   0,                            /* amfs_auto_get_wchan */
  90   FS_AMQINFO | FS_DIRECTORY,
  91 #ifdef HAVE_FS_AUTOFS
  92   AUTOFS_AUTO_FS_FLAGS,
  93 #endif /* HAVE_FS_AUTOFS */
  94 };
  95
  96
  97 /****************************************************************************
  98  *** FUNCTIONS                                                             ***
  99  ****************************************************************************/
 100 /*
 101  * Mount a sub-mount
 102  */
 103 static int
 104 amfs_auto_mount(am_node *mp, mntfs *mf)
 105 {
 106   /*
 107    * Pseudo-directories are used to provide some structure
 108    * to the automounted directories instead
 109    * of putting them all in the top-level automount directory.
 110    *
 111    * Here, just increment the parent's link count.
 112    */
 113   mp->am_parent->am_fattr.na_nlink++;
 114
 115   /*
 116    * Info field of . means use parent's info field.
 117    * Historical - not documented.
 118    */
 119   if (mf->mf_info[0] == '.' && mf->mf_info[1] == '\0')
 120     mf->mf_info = strealloc(mf->mf_info, mp->am_parent->am_mnt->mf_info);
 121
 122   /*
 123    * Compute prefix:
 124    *
 125    * If there is an option prefix then use that else
 126    * If the parent had a prefix then use that with name
 127    *      of this node appended else
 128    * Use the name of this node.
 129    *
 130    * That means if you want no prefix you must say so
 131    * in the map.
 132    */
 133   if (mf->mf_fo->opt_pref) {
 134     /* allow pref:=null to set a real null prefix */
 135     if (STREQ(mf->mf_fo->opt_pref, "null")) {
 136       mp->am_pref = strdup("");
 137     } else {
 138       /*
 139        * the prefix specified as an option
 140        */
 141       mp->am_pref = strdup(mf->mf_fo->opt_pref);
 142     }
 143   } else {
 144     /*
 145      * else the parent's prefix
 146      * followed by the name
 147      * followed by /
 148      */
 149     char *ppref = mp->am_parent->am_pref;
 150     if (ppref == 0)
 151       ppref = "";
 152     mp->am_pref = str3cat((char *) NULL, ppref, mp->am_name, "/");
 153   }
 154
 155 #ifdef HAVE_FS_AUTOFS
 156   if (mf->mf_flags & MFF_IS_AUTOFS) {
 157     char opts[SIZEOF_OPTS];
 158     int error;
 159
 160     autofs_get_opts(opts, sizeof(opts), mp->am_autofs_fh);
 161
 162     /* now do the mount */
 163     error = amfs_mount(mp, mf, opts);
 164     if (error) {
 165       errno = error;
 166       plog(XLOG_FATAL, "amfs_auto_mount: amfs_mount failed: %m");
 167       return error;
 168     }
 169   }
 170 #endif /* HAVE_FS_AUTOFS */
 171
 172   /*
 173    * Attach a map cache
 174    */
 175   amfs_mkcacheref(mf);
 176
 177   return 0;
 178 }