mount_lfs.c revision 1.21
1 /* $NetBSD: mount_lfs.c,v 1.21 2005/01/31 05:19:19 erh 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\n\ 35 The Regents of the University of California. All rights reserved.\n"); 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 1.21 2005/01/31 05:19:19 erh Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/mount.h> 48 49 #include <ufs/ufs/ufsmount.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 64 static const struct mntopt mopts[] = { 65 MOPT_STDOPTS, 66 MOPT_UPDATE, 67 MOPT_GETARGS, 68 MOPT_NOATIME, 69 { NULL } 70 }; 71 72 int main __P((int, char *[])); 73 int mount_lfs __P((int, char *[])); 74 static void invoke_cleaner __P((char *)); 75 static void usage __P((void)); 76 static void kill_daemon __P((char *)); 77 static void kill_cleaner __P((char *)); 78 79 static int short_rds, cleaner_debug, cleaner_bytes; 80 static char *nsegs; 81 82 #ifndef MOUNT_NOMAIN 83 int 84 main(argc, argv) 85 int argc; 86 char **argv; 87 { 88 return mount_lfs(argc, argv); 89 } 90 #endif 91 92 int 93 mount_lfs(argc, argv) 94 int argc; 95 char *argv[]; 96 { 97 struct ufs_args args; 98 int ch, mntflags, noclean, mntsize, oldflags, i; 99 char fs_name[MAXPATHLEN], canon_dev[MAXPATHLEN]; 100 char *options; 101 102 const char *errcause; 103 struct statvfs *mntbuf; 104 105 options = NULL; 106 nsegs = "4"; 107 mntflags = noclean = 0; 108 cleaner_bytes = 1; 109 while ((ch = getopt(argc, argv, "bdN:no:s")) != -1) 110 switch (ch) { 111 case 'b': 112 cleaner_bytes = !cleaner_bytes; 113 break; 114 case 'd': 115 cleaner_debug = 1; 116 break; 117 case 'n': 118 noclean = 1; 119 break; 120 case 'N': 121 nsegs = optarg; 122 break; 123 case 'o': 124 getmntopts(optarg, mopts, &mntflags, 0); 125 break; 126 case 's': 127 short_rds = 1; 128 break; 129 case '?': 130 default: 131 usage(); 132 } 133 argc -= optind; 134 argv += optind; 135 136 if (argc != 2) 137 usage(); 138 139 if (realpath(argv[0], canon_dev) == NULL) /* Check device path */ 140 err(1, "realpath %s", argv[0]); 141 if (strncmp(argv[0], canon_dev, MAXPATHLEN)) { 142 warnx("\"%s\" is a relative path.", argv[0]); 143 warnx("using \"%s\" instead.", canon_dev); 144 } 145 args.fspec = canon_dev; 146 147 if (realpath(argv[1], fs_name) == NULL) /* Check mounton path */ 148 err(1, "realpath %s", argv[1]); 149 if (strncmp(argv[1], fs_name, MAXPATHLEN)) { 150 warnx("\"%s\" is a relative path.", argv[1]); 151 warnx("using \"%s\" instead.", fs_name); 152 } 153 154 #define DEFAULT_ROOTUID -2 155 args.export.ex_root = DEFAULT_ROOTUID; 156 if (mntflags & MNT_RDONLY) { 157 args.export.ex_flags = MNT_EXRDONLY; 158 noclean = 1; 159 } else 160 args.export.ex_flags = 0; 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)) { 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 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 199 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 200 noclean = 1; 201 if (!noclean) 202 invoke_cleaner(fs_name); 203 /* NOTREACHED */ 204 205 /* Downgrade to r/o; kill the cleaner */ 206 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 207 kill_cleaner(fs_name); 208 209 exit(0); 210 } 211 212 static void 213 kill_daemon(pidname) 214 char *pidname; 215 { 216 FILE *fp; 217 char s[80]; 218 pid_t pid; 219 220 fp = fopen(pidname, "r"); 221 if (fp) { 222 fgets(s, 80, fp); 223 pid = atoi(s); 224 if (pid) 225 kill(pid, SIGINT); 226 fclose(fp); 227 } 228 } 229 230 static void 231 kill_cleaner(name) 232 char *name; 233 { 234 char *pidname; 235 char *cp; 236 int off; 237 238 /* Parent first */ 239 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 240 if (!pidname) 241 err(1, "malloc"); 242 off = strlen(_PATH_VARRUN); 243 while((cp = strchr(pidname + off, '/')) != NULL) 244 *cp = '|'; 245 kill_daemon(pidname); 246 free(pidname); 247 248 /* Then child */ 249 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 250 if (!pidname) 251 err(1, "malloc"); 252 off = strlen(_PATH_VARRUN); 253 while((cp = strchr(pidname + off, '/')) != NULL) 254 *cp = '|'; 255 kill_daemon(pidname); 256 free(pidname); 257 } 258 259 static void 260 invoke_cleaner(name) 261 char *name; 262 { 263 char *args[6], **ap = args; 264 265 /* Build the argument list. */ 266 *ap++ = _PATH_LFS_CLEANERD; 267 if (cleaner_bytes) 268 *ap++ = "-b"; 269 if (nsegs) { 270 *ap++ = "-n"; 271 *ap++ = nsegs; 272 } 273 if (short_rds) 274 *ap++ = "-s"; 275 if (cleaner_debug) 276 *ap++ = "-d"; 277 *ap++ = name; 278 *ap = NULL; 279 280 execv(args[0], args); 281 err(1, "exec %s", _PATH_LFS_CLEANERD); 282 } 283 284 static void 285 usage() 286 { 287 (void)fprintf(stderr, 288 "usage: %s [-bdns] [-N nsegs] [-o options] special node\n", 289 getprogname()); 290 exit(1); 291 } 292
Indexes created Fri Oct 03 02:09:57 GMT 2025