contrib/amd/amd/ops_lofs.c

   1 /*
   2  * Copyright (c) 1997-1999 Erez Zadok
   3  * Copyright (c) 1990 Jan-Simon Pendry
   4  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   5  * Copyright (c) 1990 The Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Jan-Simon Pendry at Imperial College, London.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgment:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      %W% (Berkeley) %G%
  40  *
  41  * $Id: ops_lofs.c,v 1.2 1999/01/10 21:53:49 ezk Exp $
  42  *
  43  */
  44
  45 /*
  46  * Loopback file system
  47  */
  48
  49 #ifdef HAVE_CONFIG_H
  50 # include <config.h>
  51 #endif /* HAVE_CONFIG_H */
  52 #include <am_defs.h>
  53 #include <amd.h>
  54
  55 /* forward definitions */
  56 static char * lofs_match(am_opts *fo);
  57 static int lofs_fmount(mntfs *mf);
  58 static int lofs_fumount(mntfs *mf);
  59 static int mount_lofs(char *dir, char *fs_name, char *opts);
  60
  61
  62 /*
  63  * Ops structure
  64  */
  65 am_ops lofs_ops =
  66 {
  67   "lofs",
  68   lofs_match,
  69   0,                            /* lofs_init */
  70   amfs_auto_fmount,
  71   lofs_fmount,
  72   amfs_auto_fumount,
  73   lofs_fumount,
  74   amfs_error_lookuppn,
  75   amfs_error_readdir,
  76   0,                            /* lofs_readlink */
  77   0,                            /* lofs_mounted */
  78   0,                            /* lofs_umounted */
  79   find_amfs_auto_srvr,
  80   FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO
  81 };
  82
  83
  84 /*
  85  * LOFS needs remote filesystem.
  86  */
  87 static char *
  88 lofs_match(am_opts *fo)
  89 {
  90   if (!fo->opt_rfs) {
  91     plog(XLOG_USER, "lofs: no source filesystem specified");
  92     return 0;
  93   }
  94 #ifdef DEBUG
  95   dlog("LOFS: mounting fs \"%s\" on \"%s\"",
  96        fo->opt_rfs, fo->opt_fs);
  97 #endif /* DEBUG */
  98
  99   /*
 100    * Determine magic cookie to put in mtab
 101    */
 102   return strdup(fo->opt_rfs);
 103 }
 104
 105
 106 static int
 107 mount_lofs(char *dir, char *fs_name, char *opts)
 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 = dir;
 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
 128   /*
 129    * Call generic mount routine
 130    */
 131   return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name);
 132 }
 133
 134
 135 static int
 136 lofs_fmount(mntfs *mf)
 137 {
 138   int error;
 139
 140   error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts);
 141   if (error) {
 142     errno = error;
 143     plog(XLOG_ERROR, "mount_lofs: %m");
 144     return error;
 145   }
 146   return 0;
 147 }
 148
 149
 150 static int
 151 lofs_fumount(mntfs *mf)
 152 {
 153   return UMOUNT_FS(mf->mf_mount, mnttab_file_name);
 154 }