1/* $NetBSD: ops_tmpfs.c,v 1.1.1.2 2009/03/20 20:26:50 christos Exp $ */ 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 */ 57static char *tmpfs_match(am_opts *fo); 58static int tmpfs_mount(am_node *am, mntfs *mf); 59static int tmpfs_umount(am_node *am, mntfs *mf); 60 61/* 62 * Ops structure 63 */ 64am_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 */ 89static char * 90tmpfs_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 107static int 108mount_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 174static int 175tmpfs_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 191static int 192tmpfs_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} 198 199