1 /* $NetBSD: restart.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/restart.c 43 * 44 */ 45 46 #ifdef HAVE_CONFIG_H 47 # include <config.h> 48 #endif /* HAVE_CONFIG_H */ 49 #include <am_defs.h> 50 #include <amd.h> 51 52 53 static void 54 restart_fake_mntfs(mntent_t *me, am_ops *fs_ops) 55 { 56 mntfs *mf; 57 am_opts mo; 58 char *cp; 59 60 /* 61 * Partially fake up an opts structure 62 */ 63 memset(&mo, 0, sizeof(mo)); 64 mo.opt_rhost = NULL; 65 mo.opt_rfs = NULL; 66 cp = strchr(me->mnt_fsname, ':'); 67 if (cp) { 68 *cp = '\0'; 69 mo.opt_rhost = strdup(me->mnt_fsname); 70 mo.opt_rfs = strdup(cp + 1); 71 *cp = ':'; 72 } else if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) { 73 /* 74 * Hacky workaround for mnttab NFS entries that only list the server 75 */ 76 plog(XLOG_WARNING, "NFS server entry assumed to be %s:/", me->mnt_fsname); 77 mo.opt_rhost = strdup(me->mnt_fsname); 78 mo.opt_rfs = strdup("/"); 79 me->mnt_fsname = str3cat(me->mnt_fsname, mo.opt_rhost, ":", "/"); 80 } 81 mo.opt_fs = me->mnt_dir; 82 mo.opt_opts = me->mnt_opts; 83 84 /* 85 * Make a new mounted filesystem 86 */ 87 mf = find_mntfs(fs_ops, &mo, me->mnt_dir, 88 me->mnt_fsname, "", me->mnt_opts, ""); 89 if (mf->mf_refc == 1) { 90 mf->mf_flags |= MFF_RESTART | MFF_MOUNTED; 91 mf->mf_error = 0; /* Already mounted correctly */ 92 mf->mf_fo = NULL; 93 /* 94 * Only timeout non-NFS entries 95 */ 96 if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) 97 mf->mf_flags |= MFF_RSTKEEP; 98 if (fs_ops->fs_init) { 99 /* 100 * Don't care whether this worked since 101 * it is checked again when the fs is 102 * inherited. 103 */ 104 (void) (*fs_ops->fs_init) (mf); 105 } 106 plog(XLOG_INFO, "%s restarted fstype %s on %s, flags 0x%x", 107 me->mnt_fsname, fs_ops->fs_type, me->mnt_dir, mf->mf_flags); 108 } else { 109 /* Something strange happened - two mounts at the same place! */ 110 free_mntfs(mf); 111 } 112 /* 113 * Clean up mo 114 */ 115 if (mo.opt_rhost) 116 XFREE(mo.opt_rhost); 117 if (mo.opt_rfs) 118 XFREE(mo.opt_rfs); 119 } 120 121 122 /* 123 * Handle an amd restart. 124 * 125 * Scan through the mount list finding all "interesting" mount points. 126 * Next hack up partial data structures and add the mounted file 127 * system to the list of known filesystems. 128 * 129 * This module relies on internal details of other components. If 130 * you change something else make *sure* restart() still works. 131 */ 132 void 133 restart(void) 134 { 135 mntlist *ml, *mlp; 136 137 /* 138 * Read the existing mount table. For each entry, find nfs, ufs or auto 139 * mounts and create a partial am_node to represent it. 140 */ 141 for (mlp = ml = read_mtab("restart", mnttab_file_name); 142 mlp; 143 mlp = mlp->mnext) { 144 mntent_t *me = mlp->mnt; 145 am_ops *fs_ops = NULL; 146 147 if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) { 148 /* 149 * NFS entry, or possibly an Amd entry... 150 * The mnt_fsname for daemon mount points is 151 * host:(pidXXX) 152 * or (seen on Solaris) 153 * host:daemon(pidXXX) 154 */ 155 char *colon = strchr(me->mnt_fsname, ':'); 156 if (colon && strstr(colon, "(pid")) 157 continue; 158 } 159 160 /* Search for the correct filesystem ops */ 161 fs_ops = ops_search(me->mnt_type); 162 163 /* 164 * Catch everything else with symlinks to 165 * avoid recursive mounts. This is debatable... 166 */ 167 if (!fs_ops) 168 fs_ops = &amfs_link_ops; 169 170 restart_fake_mntfs(me, fs_ops); 171 } 172 173 /* 174 * Free the mount list 175 */ 176 free_mntlist(ml); 177 } 178 179 180 /* 181 * Handle an amd restart for amd's own mount points. 182 * 183 * Scan through the mount list finding all daemon mount points 184 * (determined by the presence of a pid inside the mount info). 185 * Next hack up partial data structures and add the mounted file 186 * system to the list of known filesystems. 187 * 188 * This module relies on internal details of other components. If 189 * you change something else make *sure* restart() still works. 190 */ 191 void 192 restart_automounter_nodes(void) 193 { 194 mntlist *ml, *mlp; 195 /* reasonably sized list of restarted nfs ports */ 196 u_short old_ports[256]; 197 198 memset((voidp) &old_ports, 0, sizeof(u_short) * 256); 199 200 /* 201 * Read the existing mount table. For each entry, find nfs, ufs or auto 202 * mounts and create a partial am_node to represent it. 203 */ 204 for (mlp = ml = read_mtab("restart", mnttab_file_name); 205 mlp; 206 mlp = mlp->mnext) { 207 mntent_t *me = mlp->mnt; 208 am_ops *fs_ops = NULL; 209 char *colon; 210 long pid; 211 u_short port; 212 int err; 213 214 if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) 215 continue; /* to next mlp */ 216 /* 217 * NFS entry, or possibly an Amd entry... 218 * The mnt_fsname for daemon mount points is 219 * host:(pidXXX) 220 * or (seen on Solaris) 221 * host:daemon(pidXXX) 222 */ 223 colon = strchr(me->mnt_fsname, ':'); 224 if (!colon || !strstr(colon, "(pid")) 225 continue; 226 /* if got here, then we matched an existing Amd mount point */ 227 err = 1; 228 229 plog(XLOG_WARNING, "%s is an existing automount point", me->mnt_dir); 230 231 /* Is the old automounter still alive? */ 232 if (sscanf(colon, "%*[^(](pid%ld%*[,)]", &pid) != 1) { 233 plog(XLOG_WARNING, "Can't parse pid in %s", me->mnt_fsname); 234 goto give_up; 235 } 236 if (kill(pid, 0) != -1 || errno != ESRCH) { 237 plog(XLOG_WARNING, "Automounter (pid: %ld) still alive", pid); 238 goto give_up; 239 } 240 241 /* 242 * Do we have a map for this mount point? Who cares, we'll restart 243 * anyway -- getting ESTALE is way better than hanging. 244 */ 245 246 /* Can we restart it? Only if it tells us what port it was using... */ 247 if (sscanf(colon, "%*[^,],port%hu)", &port) != 1) { 248 plog(XLOG_WARNING, "No port specified for %s", me->mnt_fsname); 249 goto give_up; 250 } 251 252 /* Maybe we already own that port... */ 253 if (port != nfs_port) { 254 int i; 255 for (i = 0; i < 256; i++) { 256 if (old_ports[i] == port || 257 old_ports[i] == 0) 258 break; 259 } 260 if (i == 256) { 261 plog(XLOG_WARNING, "Too many open ports (256)"); 262 goto give_up; 263 } 264 265 if (old_ports[i] == 0) { 266 int soNFS; 267 SVCXPRT *nfsxprt; 268 if (create_nfs_service(&soNFS, &port, &nfsxprt, nfs_program_2) != 0) { 269 plog(XLOG_WARNING, "Can't bind to port %u", port); 270 goto give_up; 271 } 272 old_ports[i] = nfs_port = port; 273 } 274 } 275 err = 0; 276 277 give_up: 278 if (err) { 279 plog(XLOG_WARNING, "Can't restart %s, leaving it alone", me->mnt_dir); 280 fs_ops = &amfs_link_ops; 281 } else { 282 fs_ops = &amfs_toplvl_ops; 283 } 284 285 restart_fake_mntfs(me, fs_ops); 286 } /* end of "for (mlp" */ 287 288 /* free the mount list */ 289 free_mntlist(ml); 290 } 291