external/bsd/am-utils/dist/amd/ops_tmpfs.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_tmpfs.c
  43  *
  44  */
  45
  46 /*
  47  * TMPFS file system (combines RAM-fs and swap-fs)
  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 char *tmpfs_match(am_opts *fo);
  58 static int tmpfs_mount(am_node *am, mntfs *mf);
  59 static int tmpfs_umount(am_node *am, mntfs *mf);
  60
  61 /*
  62  * Ops structure
  63  */
  64 am_ops tmpfs_ops =
  65 {
  66   "tmpfs",
  67   tmpfs_match,
  68   0,                            /* tmpfs_init */
  69   tmpfs_mount,
  70   tmpfs_umount,
  71   amfs_error_lookup_child,
  72   amfs_error_mount_child,
  73   amfs_error_readdir,
  74   0,                            /* tmpfs_readlink */
  75   0,                            /* tmpfs_mounted */
  76   0,                            /* tmpfs_umounted */
  77   amfs_generic_find_srvr,
  78   0,                            /* tmpfs_get_wchan */
  79   FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
  80 #ifdef HAVE_FS_AUTOFS
  81   AUTOFS_TMPFS_FS_FLAGS,
  82 #endif /* HAVE_FS_AUTOFS */
  83 };
  84
  85
  86 /*
  87  * EFS needs local filesystem and device.
  88  */
  89 static char *
  90 tmpfs_match(am_opts *fo)
  91 {
  92
  93   if (!fo->opt_dev) {
  94     plog(XLOG_USER, "tmpfs: no device specified");
  95     return 0;
  96   }
  97
  98   dlog("EFS: mounting device \"%s\" on \"%s\"", fo->opt_dev, fo->opt_fs);
  99
 100   /*
 101    * Determine magic cookie to put in mtab
 102    */
 103   return strdup(fo->opt_dev);
 104 }
 105
 106
 107 static int
 108 mount_tmpfs(char *mntdir, char *fs_name, char *opts, int on_autofs)
 109 {
 110   tmpfs_args_t tmpfs_args;
 111   mntent_t mnt;
 112   int flags;
 113   const char *p;
 114
 115   /*
 116    * Figure out the name of the file system type.
 117    */
 118   MTYPE_TYPE type = MOUNT_TYPE_TMPFS;
 119
 120   p = NULL;
 121   memset((voidp) &tmpfs_args, 0, sizeof(tmpfs_args)); /* Paranoid */
 122
 123   /*
 124    * Fill in the mount structure
 125    */
 126   memset((voidp) &mnt, 0, sizeof(mnt));
 127   mnt.mnt_dir = mntdir;
 128   mnt.mnt_fsname = fs_name;
 129   mnt.mnt_type = MNTTAB_TYPE_TMPFS;
 130   mnt.mnt_opts = opts;
 131
 132   flags = compute_mount_flags(&mnt);
 133 #ifdef HAVE_FS_AUTOFS
 134   if (on_autofs)
 135     flags |= autofs_compute_mount_flags(&mnt);
 136 #endif /* HAVE_FS_AUTOFS */
 137
 138 #if defined(HAVE_TMPFS_ARGS_T_TA_VERSION) && defined(TMPFS_ARGS_VERSION)
 139   tmpfs_args.ta_version = TMPFS_ARGS_VERSION;
 140 #endif /* HAVE_TMPFS_ARGS_T_TA_VERSION && TMPFS_ARGS_VERSION */
 141 #ifdef HAVE_TMPFS_ARGS_T_TA_NODES_MAX
 142   if ((p = amu_hasmntopt(&mnt, "nodes")) == NULL)
 143         p = "1000000";
 144   tmpfs_args.ta_nodes_max = atoi(p);
 145 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */
 146 #ifdef HAVE_TMPFS_ARGS_T_TA_SIZE_MAX
 147   if ((p = amu_hasmntopt(&mnt, "size")) == NULL)
 148         p = "10000000";
 149   tmpfs_args.ta_size_max = atoi(p);
 150 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */
 151 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_UID
 152   if ((p = amu_hasmntopt(&mnt, "uid")) == NULL)
 153         p = "0";
 154   tmpfs_args.ta_root_uid = atoi(p);
 155 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_UID */
 156 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_GID
 157   if ((p = amu_hasmntopt(&mnt, "gid")) == NULL)
 158         p = "0";
 159   tmpfs_args.ta_root_gid = atoi(p);
 160 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_GID */
 161 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_MODE
 162   if ((p = amu_hasmntopt(&mnt, "mode")) == NULL)
 163         p = "01777";
 164   tmpfs_args.ta_root_mode = strtol(p, NULL, 8);
 165 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_MODE */
 166
 167   /*
 168    * Call generic mount routine
 169    */
 170   return mount_fs(&mnt, flags, (caddr_t) &tmpfs_args, 0, type, 0, NULL, mnttab_file_name, on_autofs);
 171 }
 172
 173
 174 static int
 175 tmpfs_mount(am_node *am, mntfs *mf)
 176 {
 177   int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
 178   int error;
 179
 180   error = mount_tmpfs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
 181   if (error) {
 182     errno = error;
 183     plog(XLOG_ERROR, "mount_tmpfs: %m");
 184     return error;
 185   }
 186
 187   return 0;
 188 }
 189
 190
 191 static int
 192 tmpfs_umount(am_node *am, mntfs *mf)
 193 {
 194   int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
 195
 196   return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
 197 }
 198