1 /* $NetBSD: mount_lfs.c,v 1.44 2026/09/09 22:22:41 perseant 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1993, 1994\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)mount_lfs.c 8.4 (Berkeley) 4/26/95"; 41 #else 42 __RCSID("$NetBSD: mount_lfs.c,v 1.44 2026/09/09 22:22:41 perseant Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/fcntl.h> 48 #include <sys/mount.h> 49 50 #include <ufs/lfs/lfs.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <stddef.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 #include <paths.h> 60 61 #include <signal.h> 62 63 #include <mntopts.h> 64 #include "pathnames.h" 65 #include "mountprog.h" 66 #include "mount_lfs.h" 67 68 static const struct mntopt mopts[] = { 69 MOPT_STDOPTS, 70 MOPT_UPDATE, 71 MOPT_GETARGS, 72 MOPT_NOATIME, 73 MOPT_RELATIME, 74 MOPT_LOG, 75 MOPT_NULL, 76 }; 77 78 __dead static void usage(void); 79 80 #ifdef WANT_CLEANER 81 __dead static void invoke_cleaner(char *); 82 static void kill_daemon(char *); 83 static void kill_cleaner(char *); 84 #endif /* WANT_CLEANER */ 85 86 #define HOWCLEAN_NONE 0 87 #define HOWCLEAN_USER 1 88 #define HOWCLEAN_KERNEL 2 89 90 static int short_rds, cleaner_debug, cleaner_bytes, fs_idle, howclean; 91 static const char *nsegs; 92 93 #ifndef MOUNT_NOMAIN 94 int 95 main(int argc, char **argv) 96 { 97 98 setprogname(argv[0]); 99 return mount_lfs(argc, argv); 100 } 101 #endif 102 103 void 104 mount_lfs_parseargs(int argc, char *argv[], 105 struct ulfs_args *args, int *mntflags, 106 char *canon_dev, char *canon_dir) 107 { 108 int ch; 109 mntoptparse_t mp; 110 111 memset(args, 0, sizeof(*args)); 112 nsegs = "4"; 113 *mntflags = MNT_LOG; 114 howclean = HOWCLEAN_KERNEL; 115 cleaner_bytes = 1; 116 while ((ch = getopt(argc, argv, "bdikN:no:su")) != -1) 117 switch (ch) { 118 case 'b': 119 cleaner_bytes = !cleaner_bytes; 120 break; 121 case 'd': 122 cleaner_debug = 1; 123 break; 124 case 'i': 125 fs_idle = 1; 126 break; 127 case 'k': 128 howclean = HOWCLEAN_KERNEL; 129 break; 130 case 'n': 131 howclean = HOWCLEAN_NONE; 132 break; 133 case 'N': 134 nsegs = optarg; 135 break; 136 case 'o': 137 mp = getmntopts(optarg, mopts, mntflags, 0); 138 if (mp == NULL) 139 err(EXIT_FAILURE, "getmntopts"); 140 freemntopts(mp); 141 break; 142 case 's': 143 short_rds = 1; 144 break; 145 case 'u': 146 howclean = HOWCLEAN_USER; 147 break; 148 case '?': 149 default: 150 usage(); 151 } 152 argc -= optind; 153 argv += optind; 154 155 if (argc != 2) 156 usage(); 157 158 pathadj(argv[0], canon_dev); 159 args->fspec = canon_dev; 160 161 pathadj(argv[1], canon_dir); 162 } 163 164 int 165 mount_lfs(int argc, char *argv[]) 166 { 167 struct ulfs_args args; 168 int mntflags; 169 int mntsize, oldflags, i; 170 char fs_name[MAXPATHLEN], canon_dev[MAXPATHLEN]; 171 struct statvfs *mntbuf; 172 const char *errcause; 173 174 mount_lfs_parseargs(argc, argv, &args, &mntflags, canon_dev, fs_name); 175 176 /* 177 * Record the previous status of this filesystem (if any) before 178 * performing the mount, so we can know whether to start or 179 * kill the cleaner process below. 180 */ 181 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 182 if (mntflags & MNT_UPDATE) { 183 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 184 err(EXIT_FAILURE, "getmntinfo"); 185 for (i = 0; i < mntsize; i++) { 186 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 187 oldflags = mntbuf[i].f_flag; 188 break; 189 } 190 } 191 } 192 193 if (mount(MOUNT_LFS, fs_name, mntflags, &args, sizeof args) == -1) { 194 switch (errno) { 195 case EMFILE: 196 errcause = "mount table full"; 197 break; 198 case EINVAL: 199 if (mntflags & MNT_UPDATE) 200 errcause = 201 "specified device does not match mounted device"; 202 else 203 errcause = "incorrect super block"; 204 break; 205 default: 206 errcause = strerror(errno); 207 break; 208 } 209 errx(EXIT_FAILURE, "%s on %s: %s", args.fspec, fs_name, errcause); 210 } 211 212 #ifdef WANT_CLEANER 213 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 214 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY) 215 || (mntflags & MNT_GETARGS)) 216 howclean = HOWCLEAN_NONE; 217 if (howclean != HOWCLEAN_NONE) 218 invoke_cleaner(fs_name); 219 /* NOTREACHED */ 220 221 /* Downgrade to r/o; kill the cleaner */ 222 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 223 kill_cleaner(fs_name); 224 #else 225 __USE(oldflags); 226 #endif /* WANT_CLEANER */ 227 228 return EXIT_SUCCESS; 229 } 230 231 #ifdef WANT_CLEANER 232 static void 233 kill_daemon(char *pidname) 234 { 235 FILE *fp; 236 char s[80]; 237 pid_t pid; 238 239 fp = fopen(pidname, "r"); 240 if (fp) { 241 fgets(s, sizeof(s), fp); 242 pid = atoi(s); 243 if (pid) 244 kill(pid, SIGINT); 245 fclose(fp); 246 } 247 } 248 249 static void 250 kill_cleaner(char *name) 251 { 252 char *pidname; 253 char *cp; 254 int off; 255 256 /* Parent first */ 257 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 258 if (!pidname) 259 err(EXIT_FAILURE, "malloc"); 260 off = strlen(_PATH_VARRUN); 261 while((cp = strchr(pidname + off, '/')) != NULL) 262 *cp = '|'; 263 kill_daemon(pidname); 264 free(pidname); 265 266 /* Then child */ 267 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 268 if (!pidname) 269 err(EXIT_FAILURE, "malloc"); 270 off = strlen(_PATH_VARRUN); 271 while((cp = strchr(pidname + off, '/')) != NULL) 272 *cp = '|'; 273 kill_daemon(pidname); 274 free(pidname); 275 } 276 277 static void 278 invoke_cleaner(char *name) 279 { 280 const char *args[7], **ap = args; 281 int fd; 282 struct lfs_autoclean_params autoclean; 283 284 if (howclean == HOWCLEAN_KERNEL) { 285 fd = open(name, O_RDONLY); 286 if (fd < 0) 287 err(EXIT_FAILURE, "opening mounted root"); 288 289 autoclean.size = sizeof(autoclean); 290 autoclean.mode = LFS_CLEANMODE_GREEDY; 291 autoclean.thresh = -1; 292 autoclean.target = -1; 293 if (fcntl(fd, LFCNAUTOCLEAN, &autoclean) < 0) 294 err(EXIT_FAILURE, "LFCNAUTOCLEAN failed"); 295 296 close(fd); 297 exit(0); 298 } 299 300 if (howclean == HOWCLEAN_USER) { 301 /* Build the argument list. */ 302 *ap++ = _PATH_LFS_CLEANERD; 303 if (cleaner_bytes) 304 *ap++ = "-b"; 305 if (nsegs) { 306 *ap++ = "-n"; 307 *ap++ = nsegs; 308 } 309 if (short_rds) 310 *ap++ = "-s"; 311 if (cleaner_debug) 312 *ap++ = "-d"; 313 if (fs_idle) 314 *ap++ = "-f"; 315 *ap++ = name; 316 *ap = NULL; 317 318 execv(args[0], __UNCONST(args)); 319 err(EXIT_FAILURE, "exec %s", _PATH_LFS_CLEANERD); 320 } 321 322 __unreachable(); 323 } 324 #endif /* WANT_CLEANER */ 325 326 static void 327 usage(void) 328 { 329 (void)fprintf(stderr, 330 "usage: %s [-bdins] [-N nsegs] [-o options] special node\n", 331 getprogname()); 332 exit(EXIT_FAILURE); 333 } 334
Indexes created Sun Oct 25 00:26:45 UTC 2026