1 /* $NetBSD: mount_lfs.c,v 1.39 2016/02/21 22:51:29 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. 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 1.39 2016/02/21 22:51:29 christos Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/mount.h> 48 49 #include <ufs/lfs/lfs.h> 50 51 #include <err.h> 52 #include <errno.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <paths.h> 58 59 #include <signal.h> 60 61 #include <mntopts.h> 62 #include "pathnames.h" 63 #include "mountprog.h" 64 #include "mount_lfs.h" 65 66 static const struct mntopt mopts[] = { 67 MOPT_STDOPTS, 68 MOPT_UPDATE, 69 MOPT_GETARGS, 70 MOPT_NOATIME, 71 MOPT_RELATIME, 72 MOPT_NULL, 73 }; 74 75 __dead static void usage(void); 76 77 #ifdef WANT_CLEANER 78 __dead static void invoke_cleaner(char *); 79 static void kill_daemon(char *); 80 static void kill_cleaner(char *); 81 #endif /* WANT_CLEANER */ 82 83 static int short_rds, cleaner_debug, cleaner_bytes, fs_idle, noclean; 84 static const char *nsegs; 85 86 #ifndef MOUNT_NOMAIN 87 int 88 main(int argc, char **argv) 89 { 90 91 setprogname(argv[0]); 92 return mount_lfs(argc, argv); 93 } 94 #endif 95 96 void 97 mount_lfs_parseargs(int argc, char *argv[], 98 struct ulfs_args *args, int *mntflags, 99 char *canon_dev, char *canon_dir) 100 { 101 int ch; 102 mntoptparse_t mp; 103 104 memset(args, 0, sizeof(*args)); 105 nsegs = "4"; 106 *mntflags = noclean = 0; 107 cleaner_bytes = 1; 108 while ((ch = getopt(argc, argv, "bdiN:no:s")) != -1) 109 switch (ch) { 110 case 'b': 111 cleaner_bytes = !cleaner_bytes; 112 break; 113 case 'd': 114 cleaner_debug = 1; 115 break; 116 case 'i': 117 fs_idle = 1; 118 break; 119 case 'n': 120 noclean = 1; 121 break; 122 case 'N': 123 nsegs = optarg; 124 break; 125 case 'o': 126 mp = getmntopts(optarg, mopts, mntflags, 0); 127 if (mp == NULL) 128 err(1, "getmntopts"); 129 freemntopts(mp); 130 break; 131 case 's': 132 short_rds = 1; 133 break; 134 case '?': 135 default: 136 usage(); 137 } 138 argc -= optind; 139 argv += optind; 140 141 if (argc != 2) 142 usage(); 143 144 pathadj(argv[0], canon_dev); 145 args->fspec = canon_dev; 146 147 pathadj(argv[1], canon_dir); 148 } 149 150 int 151 mount_lfs(int argc, char *argv[]) 152 { 153 struct ulfs_args args; 154 int mntflags; 155 int mntsize, oldflags, i; 156 char fs_name[MAXPATHLEN], canon_dev[MAXPATHLEN]; 157 struct statvfs *mntbuf; 158 const char *errcause; 159 160 mount_lfs_parseargs(argc, argv, &args, &mntflags, canon_dev, fs_name); 161 162 /* 163 * Record the previous status of this filesystem (if any) before 164 * performing the mount, so we can know whether to start or 165 * kill the cleaner process below. 166 */ 167 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 168 if (mntflags & MNT_UPDATE) { 169 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 170 err(1, "getmntinfo"); 171 for (i = 0; i < mntsize; i++) { 172 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 173 oldflags = mntbuf[i].f_flag; 174 break; 175 } 176 } 177 } 178 179 if (mount(MOUNT_LFS, fs_name, mntflags, &args, sizeof args) == -1) { 180 switch (errno) { 181 case EMFILE: 182 errcause = "mount table full"; 183 break; 184 case EINVAL: 185 if (mntflags & MNT_UPDATE) 186 errcause = 187 "specified device does not match mounted device"; 188 else 189 errcause = "incorrect super block"; 190 break; 191 default: 192 errcause = strerror(errno); 193 break; 194 } 195 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 196 } 197 198 #ifdef WANT_CLEANER 199 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 200 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY) 201 || (mntflags & MNT_GETARGS)) 202 noclean = 1; 203 if (!noclean) 204 invoke_cleaner(fs_name); 205 /* NOTREACHED */ 206 207 /* Downgrade to r/o; kill the cleaner */ 208 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 209 kill_cleaner(fs_name); 210 #else 211 __USE(oldflags); 212 #endif /* WANT_CLEANER */ 213 214 exit(0); 215 } 216 217 #ifdef WANT_CLEANER 218 static void 219 kill_daemon(char *pidname) 220 { 221 FILE *fp; 222 char s[80]; 223 pid_t pid; 224 225 fp = fopen(pidname, "r"); 226 if (fp) { 227 fgets(s, 80, fp); 228 pid = atoi(s); 229 if (pid) 230 kill(pid, SIGINT); 231 fclose(fp); 232 } 233 } 234 235 static void 236 kill_cleaner(char *name) 237 { 238 char *pidname; 239 char *cp; 240 int off; 241 242 /* Parent first */ 243 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 244 if (!pidname) 245 err(1, "malloc"); 246 off = strlen(_PATH_VARRUN); 247 while((cp = strchr(pidname + off, '/')) != NULL) 248 *cp = '|'; 249 kill_daemon(pidname); 250 free(pidname); 251 252 /* Then child */ 253 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 254 if (!pidname) 255 err(1, "malloc"); 256 off = strlen(_PATH_VARRUN); 257 while((cp = strchr(pidname + off, '/')) != NULL) 258 *cp = '|'; 259 kill_daemon(pidname); 260 free(pidname); 261 } 262 263 static void 264 invoke_cleaner(char *name) 265 { 266 const char *args[7], **ap = args; 267 268 /* Build the argument list. */ 269 *ap++ = _PATH_LFS_CLEANERD; 270 if (cleaner_bytes) 271 *ap++ = "-b"; 272 if (nsegs) { 273 *ap++ = "-n"; 274 *ap++ = nsegs; 275 } 276 if (short_rds) 277 *ap++ = "-s"; 278 if (cleaner_debug) 279 *ap++ = "-d"; 280 if (fs_idle) 281 *ap++ = "-f"; 282 *ap++ = name; 283 *ap = NULL; 284 285 execv(args[0], __UNCONST(args)); 286 err(1, "exec %s", _PATH_LFS_CLEANERD); 287 } 288 #endif /* WANT_CLEANER */ 289 290 static void 291 usage(void) 292 { 293 (void)fprintf(stderr, 294 "usage: %s [-bdins] [-N nsegs] [-o options] special node\n", 295 getprogname()); 296 exit(1); 297 } 298
Indexes created Thu Oct 02 14:10:14 GMT 2025