1 /* $NetBSD: ops_tmpfs.c,v 1.1.1.1 2008/09/19 20:07:16 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2007 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 memset((voidp) &tmpfs_args, 0, sizeof(tmpfs_args)); /* Paranoid */ 121 122 /* 123 * Fill in the mount structure 124 */ 125 memset((voidp) &mnt, 0, sizeof(mnt)); 126 mnt.mnt_dir = mntdir; 127 mnt.mnt_fsname = fs_name; 128 mnt.mnt_type = MNTTAB_TYPE_TMPFS; 129 mnt.mnt_opts = opts; 130 131 flags = compute_mount_flags(&mnt); 132 #ifdef HAVE_FS_AUTOFS 133 if (on_autofs) 134 flags |= autofs_compute_mount_flags(&mnt); 135 #endif /* HAVE_FS_AUTOFS */ 136 137 #if defined(HAVE_TMPFS_ARGS_T_TA_VERSION) && defined(TMPFS_ARGS_VERSION) 138 tmpfs_args.ta_version = TMPFS_ARGS_VERSION; 139 #endif /* HAVE_TMPFS_ARGS_T_TA_VERSION && TMPFS_ARGS_VERSION */ 140 #ifdef HAVE_TMPFS_ARGS_T_TA_NODES_MAX 141 if ((p = amu_hasmntopt(&mnt, "nodes")) == NULL) 142 p = "1000000"; 143 tmpfs_args.ta_nodes_max = atoi(p); 144 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */ 145 #ifdef HAVE_TMPFS_ARGS_T_TA_SIZE_MAX 146 if ((p = amu_hasmntopt(&mnt, "size")) == NULL) 147 p = "10000000"; 148 tmpfs_args.ta_size_max = atoi(p); 149 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */ 150 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_UID 151 if ((p = amu_hasmntopt(&mnt, "uid")) == NULL) 152 p = "0"; 153 tmpfs_args.ta_root_uid = atoi(p); 154 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_UID */ 155 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_GID 156 if ((p = amu_hasmntopt(&mnt, "gid")) == NULL) 157 p = "0"; 158 tmpfs_args.ta_root_gid = atoi(p); 159 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_GID */ 160 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_MODE 161 if ((p = amu_hasmntopt(&mnt, "mode")) == NULL) 162 p = "01777"; 163 tmpfs_args.ta_root_mode = strtol(p, NULL, 8); 164 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_MODE */ 165 166 /* 167 * Call generic mount routine 168 */ 169 return mount_fs(&mnt, flags, (caddr_t) &tmpfs_args, 0, type, 0, NULL, mnttab_file_name, on_autofs); 170 } 171 172 173 static int 174 tmpfs_mount(am_node *am, mntfs *mf) 175 { 176 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; 177 int error; 178 179 error = mount_tmpfs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs); 180 if (error) { 181 errno = error; 182 plog(XLOG_ERROR, "mount_tmpfs: %m"); 183 return error; 184 } 185 186 return 0; 187 } 188 189 190 static int 191 tmpfs_umount(am_node *am, mntfs *mf) 192 { 193 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0; 194 195 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags); 196 } 197 198