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      1 /*	$NetBSD: ops_lofs.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *
     38  * File: am-utils/amd/ops_lofs.c
     39  *
     40  */
     41 
     42 /*
     43  * Loopback file system
     44  */
     45 
     46 #ifdef HAVE_CONFIG_H
     47 # include <config.h>
     48 #endif /* HAVE_CONFIG_H */
     49 #include <am_defs.h>
     50 #include <amd.h>
     51 
     52 /* forward definitions */
     53 static char *lofs_match(am_opts *fo);
     54 static int lofs_mount(am_node *am, mntfs *mf);
     55 static int lofs_umount(am_node *am, mntfs *mf);
     56 
     57 /*
     58  * Ops structure
     59  */
     60 am_ops lofs_ops =
     61 {
     62   "lofs",
     63   lofs_match,
     64   0,				/* lofs_init */
     65   lofs_mount,
     66   lofs_umount,
     67   amfs_error_lookup_child,
     68   amfs_error_mount_child,
     69   amfs_error_readdir,
     70   0,				/* lofs_readlink */
     71   0,				/* lofs_mounted */
     72   0,				/* lofs_umounted */
     73   amfs_generic_find_srvr,
     74   0,				/* lofs_get_wchan */
     75   FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
     76 #ifdef HAVE_FS_AUTOFS
     77   AUTOFS_LOFS_FS_FLAGS,
     78 #endif /* HAVE_FS_AUTOFS */
     79 };
     80 
     81 
     82 /*
     83  * LOFS needs remote filesystem.
     84  */
     85 static char *
     86 lofs_match(am_opts *fo)
     87 {
     88   if (!fo->opt_rfs) {
     89     plog(XLOG_USER, "lofs: no source filesystem specified");
     90     return 0;
     91   }
     92   dlog("LOFS: mounting fs \"%s\" on \"%s\"",
     93        fo->opt_rfs, fo->opt_fs);
     94 
     95   /*
     96    * Determine magic cookie to put in mtab
     97    */
     98   return xstrdup(fo->opt_rfs);
     99 }
    100 
    101 
    102 int
    103 mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs)
    104 {
    105   mntent_t mnt;
    106   int flags;
    107 
    108   /*
    109    * Figure out the name of the file system type.
    110    */
    111   MTYPE_TYPE type = MOUNT_TYPE_LOFS;
    112 
    113   /*
    114    * Fill in the mount structure
    115    */
    116   memset((voidp) &mnt, 0, sizeof(mnt));
    117   mnt.mnt_dir = mntdir;
    118   mnt.mnt_fsname = fs_name;
    119   mnt.mnt_type = MNTTAB_TYPE_LOFS;
    120   mnt.mnt_opts = opts;
    121 
    122   flags = compute_mount_flags(&mnt);
    123 #ifdef HAVE_FS_AUTOFS
    124   if (on_autofs)
    125     flags |= autofs_compute_mount_flags(&mnt);
    126 #endif /* HAVE_FS_AUTOFS */
    127 
    128   /*
    129    * Call generic mount routine
    130    */
    131   return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs);
    132 }
    133 
    134 
    135 static int
    136 lofs_mount(am_node *am, mntfs *mf)
    137 {
    138   int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
    139   int error;
    140 
    141   error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
    142   if (error) {
    143     errno = error;
    144     plog(XLOG_ERROR, "mount_lofs: %m");
    145     return error;
    146   }
    147   return 0;
    148 }
    149 
    150 
    151 static int
    152 lofs_umount(am_node *am, mntfs *mf)
    153 {
    154   int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
    155 
    156   return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
    157 }
    158