1 /* $NetBSD: mount_lfs.c,v 1.14 2002/09/21 18:43:35 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. 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 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)mount_lfs.c 8.4 (Berkeley) 4/26/95"; 45 #else 46 __RCSID("$NetBSD: mount_lfs.c,v 1.14 2002/09/21 18:43:35 christos Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/mount.h> 52 53 #include <ufs/ufs/ufsmount.h> 54 55 #include <err.h> 56 #include <errno.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #include <paths.h> 62 63 #include <signal.h> 64 65 #include "mntopts.h" 66 #include "pathnames.h" 67 68 static const struct mntopt mopts[] = { 69 MOPT_STDOPTS, 70 MOPT_UPDATE, 71 MOPT_GETARGS, 72 { NULL } 73 }; 74 75 int main __P((int, char *[])); 76 int mount_lfs __P((int, char *[])); 77 static void invoke_cleaner __P((char *)); 78 static void usage __P((void)); 79 static void kill_daemon __P((char *)); 80 static void kill_cleaner __P((char *)); 81 82 static int short_rds, cleaner_debug, cleaner_bytes; 83 static char *nsegs; 84 85 #ifndef MOUNT_NOMAIN 86 int 87 main(argc, argv) 88 int argc; 89 char **argv; 90 { 91 return mount_lfs(argc, argv); 92 } 93 #endif 94 95 int 96 mount_lfs(argc, argv) 97 int argc; 98 char *argv[]; 99 { 100 struct ufs_args args; 101 int ch, mntflags, noclean, mntsize, oldflags, i; 102 char *fs_name, *options; 103 104 const char *errcause; 105 struct statfs *mntbuf; 106 107 options = NULL; 108 nsegs = "4"; 109 mntflags = noclean = 0; 110 cleaner_bytes = 1; 111 while ((ch = getopt(argc, argv, "bdN:no:s")) != -1) 112 switch (ch) { 113 case 'b': 114 cleaner_bytes = !cleaner_bytes; 115 break; 116 case 'd': 117 cleaner_debug = 1; 118 break; 119 case 'n': 120 noclean = 1; 121 break; 122 case 'N': 123 nsegs = optarg; 124 break; 125 case 'o': 126 getmntopts(optarg, mopts, &mntflags, 0); 127 break; 128 case 's': 129 short_rds = 1; 130 break; 131 case '?': 132 default: 133 usage(); 134 } 135 argc -= optind; 136 argv += optind; 137 138 if (argc != 2) 139 usage(); 140 141 args.fspec = argv[0]; /* the name of the device file */ 142 fs_name = argv[1]; /* the mount point */ 143 144 #define DEFAULT_ROOTUID -2 145 args.export.ex_root = DEFAULT_ROOTUID; 146 if (mntflags & MNT_RDONLY) { 147 args.export.ex_flags = MNT_EXRDONLY; 148 noclean = 1; 149 } else 150 args.export.ex_flags = 0; 151 152 /* 153 * Record the previous status of this filesystem (if any) before 154 * performing the mount, so we can know whether to start or 155 * kill the cleaner process below. 156 */ 157 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 158 if (mntflags & MNT_UPDATE) { 159 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 160 err(1, "getmntinfo"); 161 for (i = 0; i < mntsize; i++) { 162 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 163 oldflags = mntbuf[i].f_flags; 164 break; 165 } 166 } 167 } 168 169 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 170 switch (errno) { 171 case EMFILE: 172 errcause = "mount table full"; 173 break; 174 case EINVAL: 175 if (mntflags & MNT_UPDATE) 176 errcause = 177 "specified device does not match mounted device"; 178 else 179 errcause = "incorrect super block"; 180 break; 181 default: 182 errcause = strerror(errno); 183 break; 184 } 185 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 186 } 187 188 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 189 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 190 noclean = 1; 191 if (!noclean) 192 invoke_cleaner(fs_name); 193 /* NOTREACHED */ 194 195 /* Downgrade to r/o; kill the cleaner */ 196 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 197 kill_cleaner(fs_name); 198 199 exit(0); 200 } 201 202 static void 203 kill_daemon(pidname) 204 char *pidname; 205 { 206 FILE *fp; 207 char s[80]; 208 pid_t pid; 209 210 fp = fopen(pidname, "r"); 211 if (fp) { 212 fgets(s, 80, fp); 213 pid = atoi(s); 214 if (pid) 215 kill(pid, SIGINT); 216 fclose(fp); 217 } 218 } 219 220 static void 221 kill_cleaner(name) 222 char *name; 223 { 224 char *pidname; 225 char *cp; 226 int off; 227 228 /* Parent first */ 229 pidname = malloc(strlen(name) + 20 + strlen(_PATH_VARRUN)); 230 sprintf(pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 231 off = strlen(_PATH_VARRUN); 232 while((cp = strchr(pidname + off, '/')) != NULL) 233 *cp = '|'; 234 kill_daemon(pidname); 235 236 /* Then child */ 237 sprintf(pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 238 off = strlen(_PATH_VARRUN); 239 while((cp = strchr(pidname + off, '/')) != NULL) 240 *cp = '|'; 241 kill_daemon(pidname); 242 } 243 244 static void 245 invoke_cleaner(name) 246 char *name; 247 { 248 char *args[6], **ap = args; 249 250 /* Build the argument list. */ 251 *ap++ = _PATH_LFS_CLEANERD; 252 if (cleaner_bytes) 253 *ap++ = "-b"; 254 if (nsegs) { 255 *ap++ = "-n"; 256 *ap++ = nsegs; 257 } 258 if (short_rds) 259 *ap++ = "-s"; 260 if (cleaner_debug) 261 *ap++ = "-d"; 262 *ap++ = name; 263 *ap = NULL; 264 265 execv(args[0], args); 266 err(1, "exec %s", _PATH_LFS_CLEANERD); 267 } 268 269 static void 270 usage() 271 { 272 (void)fprintf(stderr, 273 "usage: mount_lfs [-dns] [-o options] special node\n"); 274 exit(1); 275 } 276