external/bsd/am-utils/dist/amd/amfs_linkx.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_linkx.c
  43  *
  44  */
  45
  46 /*
  47  * Symbol-link file system, with test that the target of the link exists.
  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 /* forward declarations */
  57 static int amfs_linkx_mount(am_node *mp, mntfs *mf);
  58 static int amfs_linkx_umount(am_node *mp, mntfs *mf);
  59
  60 /*
  61  * linkx operations
  62  */
  63 struct am_ops amfs_linkx_ops =
  64 {
  65   "linkx",
  66   amfs_link_match,
  67   0,                            /* amfs_linkx_init */
  68   amfs_linkx_mount,
  69   amfs_linkx_umount,
  70   amfs_error_lookup_child,
  71   amfs_error_mount_child,
  72   amfs_error_readdir,
  73   0,                            /* amfs_linkx_readlink */
  74   0,                            /* amfs_linkx_mounted */
  75   0,                            /* amfs_linkx_umounted */
  76   amfs_generic_find_srvr,
  77   0,                            /* amfs_linkx_get_wchan */
  78   FS_MBACKGROUND,
  79 #ifdef HAVE_FS_AUTOFS
  80   AUTOFS_LINKX_FS_FLAGS,
  81 #endif /* HAVE_FS_AUTOFS */
  82 };
  83
  84
  85 static int
  86 amfs_linkx_mount(am_node *mp, mntfs *mf)
  87 {
  88   /*
  89    * Check for existence of target.
  90    */
  91   struct stat stb;
  92   char *ln;
  93
  94   if (mp->am_link)
  95     ln = mp->am_link;
  96   else                          /* should never occur */
  97     ln = mf->mf_mount;
  98
  99   /*
 100    * Use lstat, not stat, since we don't
 101    * want to know if the ultimate target of
 102    * a symlink chain exists, just the first.
 103    */
 104   if (lstat(ln, &stb) < 0)
 105     return errno;
 106
 107   return 0;
 108 }
 109
 110
 111 static int
 112 amfs_linkx_umount(am_node *mp, mntfs *mf)
 113 {
 114   return 0;
 115 }