1/* 2 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * 36 * File: am-utils/amd/ops_tmpfs.c 37 * 38 */ 39 40/* 41 * TMPFS file system (combines RAM-fs and swap-fs) 42 */ 43 44#ifdef HAVE_CONFIG_H 45# include <config.h> 46#endif /* HAVE_CONFIG_H */ 47#include <am_defs.h> 48#include <amd.h> 49 50/* forward declarations */ 51static char *tmpfs_match(am_opts *fo); 52static int tmpfs_mount(am_node *am, mntfs *mf); 53static int tmpfs_umount(am_node *am, mntfs *mf); 54 55/* 56 * Ops structure 57 */ 58am_ops tmpfs_ops = 59{ 60 "tmpfs", 61 tmpfs_match, 62 0, /* tmpfs_init */ 63 tmpfs_mount, 64 tmpfs_umount, 65 amfs_error_lookup_child, 66 amfs_error_mount_child, 67 amfs_error_readdir, 68 0, /* tmpfs_readlink */ 69 0, /* tmpfs_mounted */ 70 0, /* tmpfs_umounted */ 71 amfs_generic_find_srvr, 72 0, /* tmpfs_get_wchan */ 73 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */ 74#if defined(HAVE_FS_AUTOFS) && defined(AUTOFS_TMPFS_FS_FLAGS) 75 AUTOFS_TMPFS_FS_FLAGS, 76#endif /* HAVE_FS_AUTOFS */ 77}; 78 79 80/* 81 * EFS needs local filesystem and device. 82 */ 83static char * 84tmpfs_match(am_opts *fo) 85{ 86 87 if (!fo->opt_dev) { 88 plog(XLOG_USER, "tmpfs: no device specified"); 89 return 0; 90 } 91 92 dlog("EFS: mounting device \"%s\" on \"%s\"", fo->opt_dev, fo->opt_fs); 93 94 /* 95 * Determine magic cookie to put in mtab 96 */ 97 return xstrdup(fo->opt_dev); 98} 99 100 101static int 102mount_tmpfs(char *mntdir, char *fs_name, char *opts, int on_autofs) 103{ 104 tmpfs_args_t tmpfs_args; 105 mntent_t mnt; 106 int flags; 107 const char *p; 108 109 /* 110 * Figure out the name of the file system type. 111 */ 112 MTYPE_TYPE type = MOUNT_TYPE_TMPFS; 113 114 p = NULL; 115 memset((voidp) &tmpfs_args, 0, sizeof(tmpfs_args)); /* Paranoid */ 116 117 /* 118 * Fill in the mount structure 119 */ 120 memset((voidp) &mnt, 0, sizeof(mnt)); 121 mnt.mnt_dir = mntdir; 122 mnt.mnt_fsname = fs_name; 123 mnt.mnt_type = MNTTAB_TYPE_TMPFS; 124 mnt.mnt_opts = opts; 125 126 flags = compute_mount_flags(&mnt); 127#ifdef HAVE_FS_AUTOFS 128 if (on_autofs) 129 flags |= autofs_compute_mount_flags(&mnt); 130#endif /* HAVE_FS_AUTOFS */ 131 132#if defined(HAVE_TMPFS_ARGS_T_TA_VERSION) && defined(TMPFS_ARGS_VERSION) 133 tmpfs_args.ta_version = TMPFS_ARGS_VERSION; 134#endif /* HAVE_TMPFS_ARGS_T_TA_VERSION && TMPFS_ARGS_VERSION */ 135#ifdef HAVE_TMPFS_ARGS_T_TA_NODES_MAX 136 if ((p = amu_hasmntopt(&mnt, "nodes")) == NULL) 137 p = "1000000"; 138 tmpfs_args.ta_nodes_max = atoi(p); 139#endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */ 140#ifdef HAVE_TMPFS_ARGS_T_TA_SIZE_MAX 141 if ((p = amu_hasmntopt(&mnt, "size")) == NULL) 142 p = "10000000"; 143 tmpfs_args.ta_size_max = atoi(p); 144#endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */ 145#ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_UID 146 if ((p = amu_hasmntopt(&mnt, "uid")) == NULL) 147 p = "0"; 148 tmpfs_args.ta_root_uid = atoi(p); 149#endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_UID */ 150#ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_GID 151 if ((p = amu_hasmntopt(&mnt, "gid")) == NULL) 152 p = "0"; 153 tmpfs_args.ta_root_gid = atoi(p); 154#endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_GID */ 155#ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_MODE 156 if ((p = amu_hasmntopt(&mnt, "mode")) == NULL) 157 p = "01777"; 158 tmpfs_args.ta_root_mode = strtol(p, NULL, 8); 159#endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_MODE */ 160 161 /* 162 * Call generic mount routine 163 */ 164 return mount_fs(&mnt, flags, (caddr_t) &tmpfs_args, 0, type, 0, NULL, mnttab_file_name, on_autofs); 165} 166 167 168static int 169tmpfs_mount(am_node *am, mntfs *mf) 170{ 171 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; 172 int error; 173 174 error = mount_tmpfs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs); 175 if (error) { 176 errno = error; 177 plog(XLOG_ERROR, "mount_tmpfs: %m"); 178 return error; 179 } 180 181 return 0; 182} 183 184 185static int 186tmpfs_umount(am_node *am, mntfs *mf) 187{ 188 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0; 189 190 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags); 191} 192 193