1 /* $NetBSD: restart.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/restart.c 39 * 40 */ 41 42 #ifdef HAVE_CONFIG_H 43 # include <config.h> 44 #endif /* HAVE_CONFIG_H */ 45 #include <am_defs.h> 46 #include <amd.h> 47 48 49 static void 50 restart_fake_mntfs(mntent_t *me, am_ops *fs_ops) 51 { 52 mntfs *mf; 53 am_opts mo; 54 char *cp; 55 56 /* 57 * Partially fake up an opts structure 58 */ 59 memset(&mo, 0, sizeof(mo)); 60 mo.opt_rhost = NULL; 61 mo.opt_rfs = NULL; 62 cp = strchr(me->mnt_fsname, ':'); 63 if (cp) { 64 *cp = '\0'; 65 mo.opt_rhost = xstrdup(me->mnt_fsname); 66 mo.opt_rfs = xstrdup(cp + 1); 67 *cp = ':'; 68 } else if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) { 69 /* 70 * Hacky workaround for mnttab NFS entries that only list the server 71 */ 72 plog(XLOG_WARNING, "NFS server entry assumed to be %s:/", me->mnt_fsname); 73 mo.opt_rhost = xstrdup(me->mnt_fsname); 74 mo.opt_rfs = xstrdup("/"); 75 me->mnt_fsname = str3cat(me->mnt_fsname, mo.opt_rhost, ":", "/"); 76 } 77 mo.opt_fs = me->mnt_dir; 78 mo.opt_opts = me->mnt_opts; 79 80 /* 81 * Make a new mounted filesystem 82 */ 83 mf = find_mntfs(fs_ops, &mo, me->mnt_dir, 84 me->mnt_fsname, "", me->mnt_opts, ""); 85 if (mf->mf_refc == 1) { 86 mf->mf_flags |= MFF_RESTART | MFF_MOUNTED; 87 mf->mf_error = 0; /* Already mounted correctly */ 88 /* 89 * Only timeout non-NFS entries 90 */ 91 if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) 92 mf->mf_flags |= MFF_RSTKEEP; 93 if (fs_ops->fs_init) { 94 /* 95 * Don't care whether this worked since 96 * it is checked again when the fs is 97 * inherited. 98 */ 99 (void) (*fs_ops->fs_init) (mf); 100 } 101 plog(XLOG_INFO, "%s restarted fstype %s on %s, flags 0x%x", 102 me->mnt_fsname, fs_ops->fs_type, me->mnt_dir, mf->mf_flags); 103 } else { 104 /* Something strange happened - two mounts at the same place! */ 105 free_mntfs(mf); 106 } 107 /* 108 * Clean up mo 109 */ 110 XFREE(mo.opt_rhost); 111 XFREE(mo.opt_rfs); 112 } 113 114 115 /* 116 * Handle an amd restart. 117 * 118 * Scan through the mount list finding all "interesting" mount points. 119 * Next hack up partial data structures and add the mounted file 120 * system to the list of known filesystems. 121 * 122 * This module relies on internal details of other components. If 123 * you change something else make *sure* restart() still works. 124 */ 125 void 126 restart(void) 127 { 128 mntlist *ml, *mlp; 129 130 /* 131 * Read the existing mount table. For each entry, find nfs, ufs or auto 132 * mounts and create a partial am_node to represent it. 133 */ 134 for (mlp = ml = read_mtab("restart", mnttab_file_name); 135 mlp; 136 mlp = mlp->mnext) { 137 mntent_t *me = mlp->mnt; 138 am_ops *fs_ops = NULL; 139 140 if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) { 141 /* 142 * NFS entry, or possibly an Amd entry... 143 * The mnt_fsname for daemon mount points is 144 * host:(pidXXX) 145 * or (seen on Solaris) 146 * host:daemon(pidXXX) 147 */ 148 char *colon = strchr(me->mnt_fsname, ':'); 149 if (colon && strstr(colon, "(pid")) 150 continue; 151 } 152 153 /* Search for the correct filesystem ops */ 154 fs_ops = ops_search(me->mnt_type); 155 156 /* 157 * Catch everything else with symlinks to 158 * avoid recursive mounts. This is debatable... 159 */ 160 if (!fs_ops) 161 fs_ops = &amfs_link_ops; 162 163 restart_fake_mntfs(me, fs_ops); 164 } 165 166 /* 167 * Free the mount list 168 */ 169 free_mntlist(ml); 170 } 171 172 173 /* 174 * Handle an amd restart for amd's own mount points. 175 * 176 * Scan through the mount list finding all daemon mount points 177 * (determined by the presence of a pid inside the mount info). 178 * Next hack up partial data structures and add the mounted file 179 * system to the list of known filesystems. 180 * 181 * This module relies on internal details of other components. If 182 * you change something else make *sure* restart() still works. 183 */ 184 void 185 restart_automounter_nodes(void) 186 { 187 mntlist *ml, *mlp; 188 /* reasonably sized list of restarted nfs ports */ 189 u_short old_ports[256]; 190 191 memset((voidp) &old_ports, 0, sizeof(u_short) * 256); 192 193 /* 194 * Read the existing mount table. For each entry, find nfs, ufs or auto 195 * mounts and create a partial am_node to represent it. 196 */ 197 for (mlp = ml = read_mtab("restart", mnttab_file_name); 198 mlp; 199 mlp = mlp->mnext) { 200 mntent_t *me = mlp->mnt; 201 am_ops *fs_ops = NULL; 202 char *colon; 203 long pid; 204 u_short port; 205 int err; 206 207 if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) 208 continue; /* to next mlp */ 209 /* 210 * NFS entry, or possibly an Amd entry... 211 * The mnt_fsname for daemon mount points is 212 * host:(pidXXX) 213 * or (seen on Solaris) 214 * host:daemon(pidXXX) 215 */ 216 colon = strchr(me->mnt_fsname, ':'); 217 if (!colon || !strstr(colon, "(pid")) 218 continue; 219 /* if got here, then we matched an existing Amd mount point */ 220 err = 1; 221 222 plog(XLOG_WARNING, "%s is an existing automount point", me->mnt_dir); 223 224 /* Is the old automounter still alive? */ 225 if (sscanf(colon, "%*[^(](pid%ld%*[,)]", &pid) != 1) { 226 plog(XLOG_WARNING, "Can't parse pid in %s", me->mnt_fsname); 227 goto give_up; 228 } 229 if (kill(pid, 0) != -1 || errno != ESRCH) { 230 plog(XLOG_WARNING, "Automounter (pid: %ld) still alive", pid); 231 goto give_up; 232 } 233 234 /* 235 * Do we have a map for this mount point? Who cares, we'll restart 236 * anyway -- getting ESTALE is way better than hanging. 237 */ 238 239 /* Can we restart it? Only if it tells us what port it was using... */ 240 if (sscanf(colon, "%*[^,],port%hu)", &port) != 1) { 241 plog(XLOG_WARNING, "No port specified for %s", me->mnt_fsname); 242 goto give_up; 243 } 244 245 /* Maybe we already own that port... */ 246 if (port != nfs_port) { 247 int i; 248 for (i = 0; i < 256; i++) { 249 if (old_ports[i] == port || 250 old_ports[i] == 0) 251 break; 252 } 253 if (i == 256) { 254 plog(XLOG_WARNING, "Too many open ports (256)"); 255 goto give_up; 256 } 257 258 if (old_ports[i] == 0) { 259 int soNFS; 260 SVCXPRT *nfsxprt; 261 if (create_nfs_service(&soNFS, &port, &nfsxprt, nfs_dispatcher, 262 get_nfs_dispatcher_version(nfs_dispatcher)) != 0) { 263 plog(XLOG_WARNING, "Can't bind to port %u", port); 264 goto give_up; 265 } 266 old_ports[i] = nfs_port = port; 267 } 268 } 269 err = 0; 270 271 give_up: 272 if (err) { 273 plog(XLOG_WARNING, "Can't restart %s, leaving it alone", me->mnt_dir); 274 fs_ops = &amfs_link_ops; 275 } else { 276 fs_ops = &amfs_toplvl_ops; 277 } 278 279 restart_fake_mntfs(me, fs_ops); 280 } /* end of "for (mlp" */ 281 282 /* free the mount list */ 283 free_mntlist(ml); 284 } 285