external/bsd/am-utils/dist/amd/ops_lofs.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/ops_lofs.c
  43  *
  44  */
  45
  46 /*
  47  * Loopback 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 /* forward definitions */
  57 static char *lofs_match(am_opts *fo);
  58 static int lofs_mount(am_node *am, mntfs *mf);
  59 static int lofs_umount(am_node *am, mntfs *mf);
  60
  61 /*
  62  * Ops structure
  63  */
  64 am_ops lofs_ops =
  65 {
  66   "lofs",
  67   lofs_match,
  68   0,                            /* lofs_init */
  69   lofs_mount,
  70   lofs_umount,
  71   amfs_error_lookup_child,
  72   amfs_error_mount_child,
  73   amfs_error_readdir,
  74   0,                            /* lofs_readlink */
  75   0,                            /* lofs_mounted */
  76   0,                            /* lofs_umounted */
  77   amfs_generic_find_srvr,
  78   0,                            /* lofs_get_wchan */
  79   FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
  80 #ifdef HAVE_FS_AUTOFS
  81   AUTOFS_LOFS_FS_FLAGS,
  82 #endif /* HAVE_FS_AUTOFS */
  83 };
  84
  85
  86 /*
  87  * LOFS needs remote filesystem.
  88  */
  89 static char *
  90 lofs_match(am_opts *fo)
  91 {
  92   if (!fo->opt_rfs) {
  93     plog(XLOG_USER, "lofs: no source filesystem specified");
  94     return 0;
  95   }
  96   dlog("LOFS: mounting fs \"%s\" on \"%s\"",
  97        fo->opt_rfs, fo->opt_fs);
  98
  99   /*
 100    * Determine magic cookie to put in mtab
 101    */
 102   return strdup(fo->opt_rfs);
 103 }
 104
 105
 106 int
 107 mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs)
 108 {
 109   mntent_t mnt;
 110   int flags;
 111
 112   /*
 113    * Figure out the name of the file system type.
 114    */
 115   MTYPE_TYPE type = MOUNT_TYPE_LOFS;
 116
 117   /*
 118    * Fill in the mount structure
 119    */
 120   memset((voidp) &mnt, 0, sizeof(mnt));
 121   mnt.mnt_dir = mntdir;
 122   mnt.mnt_fsname = fs_name;
 123   mnt.mnt_type = MNTTAB_TYPE_LOFS;
 124   mnt.mnt_opts = opts;
 125
 126   flags = compute_mount_flags(&mnt);
 127 #ifdef HAVE_FS_AUTOFS
 128   if (on_autofs)
 129     flags |= autofs_compute_mount_flags(&mnt);
 130 #endif /* HAVE_FS_AUTOFS */
 131
 132   /*
 133    * Call generic mount routine
 134    */
 135   return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs);
 136 }
 137
 138
 139 static int
 140 lofs_mount(am_node *am, mntfs *mf)
 141 {
 142   int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
 143   int error;
 144
 145   error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
 146   if (error) {
 147     errno = error;
 148     plog(XLOG_ERROR, "mount_lofs: %m");
 149     return error;
 150   }
 151   return 0;
 152 }
 153
 154
 155 static int
 156 lofs_umount(am_node *am, mntfs *mf)
 157 {
 158   int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
 159
 160   return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
 161 }