external/bsd/am-utils/dist/amd/amfs_direct.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_direct.c
  43  *
  44  */
  45
  46 /*
  47  * Direct 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  *** FORWARD DEFINITIONS                                                  ***
  58  ****************************************************************************/
  59 static am_node *amfs_direct_readlink(am_node *mp, int *error_return);
  60
  61 /****************************************************************************
  62  *** OPS STRUCTURES                                                       ***
  63  ****************************************************************************/
  64 am_ops amfs_direct_ops =
  65 {
  66   "direct",
  67   amfs_generic_match,
  68   0,                            /* amfs_direct_init */
  69   amfs_toplvl_mount,
  70   amfs_toplvl_umount,
  71   amfs_generic_lookup_child,
  72   amfs_generic_mount_child,
  73   amfs_error_readdir,
  74   amfs_direct_readlink,
  75   amfs_generic_mounted,
  76   0,                            /* amfs_direct_umounted */
  77   amfs_generic_find_srvr,
  78   0,                            /* amfs_direct_get_wchan */
  79   FS_DIRECT | FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO,
  80 #ifdef HAVE_FS_AUTOFS
  81   AUTOFS_DIRECT_FS_FLAGS,
  82 #endif /* HAVE_FS_AUTOFS */
  83 };
  84
  85
  86 /****************************************************************************
  87  *** FUNCTIONS                                                             ***
  88  ****************************************************************************/
  89
  90 static am_node *
  91 amfs_direct_readlink(am_node *mp, int *error_return)
  92 {
  93   am_node *xp;
  94   int rc = 0;
  95
  96   xp = next_nonerror_node(mp->am_child);
  97   if (!xp) {
  98     if (!mp->am_mnt->mf_private)
  99       amfs_mkcacheref(mp->am_mnt);      /* XXX */
 100     xp = amfs_generic_lookup_child(mp, mp->am_path + 1, &rc, VLOOK_CREATE);
 101     if (xp && rc < 0)
 102       xp = amfs_generic_mount_child(xp, &rc);
 103   }
 104   if (xp) {
 105     new_ttl(xp);                /* (7/12/89) from Rein Tollevik */
 106     return xp;
 107   }
 108   if (amd_state == Finishing)
 109     rc = ENOENT;
 110   *error_return = rc;
 111   return 0;
 112 }