mount_lfs.c revision 1.37
1 /* $NetBSD: mount_lfs.c,v 1.37 2013/10/19 23:14:27 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 1.37 2013/10/19 23:14:27 christos 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 #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_NULL, 72 }; 73 74 __dead static void usage(void); 75 76 #ifdef WANT_CLEANER 77 __dead static void invoke_cleaner(char *); 78 static void kill_daemon(char *); 79 static void kill_cleaner(char *); 80 #endif /* WANT_CLEANER */ 81 82 static int short_rds, cleaner_debug, cleaner_bytes, fs_idle, noclean; 83 static const char *nsegs; 84 85 #ifndef MOUNT_NOMAIN 86 int 87 main(int argc, char **argv) 88 { 89 90 setprogname(argv[0]); 91 return mount_lfs(argc, argv); 92 } 93 #endif 94 95 void 96 mount_lfs_parseargs(int argc, char *argv[], 97 struct ufs_args *args, int *mntflags, 98 char *canon_dev, char *canon_dir) 99 { 100 int ch; 101 mntoptparse_t mp; 102 103 memset(args, 0, sizeof(*args)); 104 nsegs = "4"; 105 *mntflags = noclean = 0; 106 cleaner_bytes = 1; 107 while ((ch = getopt(argc, argv, "bdiN:no:s")) != -1) 108 switch (ch) { 109 case 'b': 110 cleaner_bytes = !cleaner_bytes; 111 break; 112 case 'd': 113 cleaner_debug = 1; 114 break; 115 case 'i': 116 fs_idle = 1; 117 break; 118 case 'n': 119 noclean = 1; 120 break; 121 case 'N': 122 nsegs = optarg; 123 break; 124 case 'o': 125 mp = getmntopts(optarg, mopts, mntflags, 0); 126 if (mp == NULL) 127 err(1, "getmntopts"); 128 freemntopts(mp); 129 break; 130 case 's': 131 short_rds = 1; 132 break; 133 case '?': 134 default: 135 usage(); 136 } 137 argc -= optind; 138 argv += optind; 139 140 if (argc != 2) 141 usage(); 142 143 pathadj(argv[0], canon_dev); 144 args->fspec = canon_dev; 145 146 pathadj(argv[1], canon_dir); 147 } 148 149 int 150 mount_lfs(int argc, char *argv[]) 151 { 152 struct ufs_args args; 153 int mntflags; 154 int mntsize, oldflags, i; 155 char fs_name[MAXPATHLEN], canon_dev[MAXPATHLEN]; 156 struct statvfs *mntbuf; 157 const char *errcause; 158 159 mount_lfs_parseargs(argc, argv, &args, &mntflags, canon_dev, fs_name); 160 161 /* 162 * Record the previous status of this filesystem (if any) before 163 * performing the mount, so we can know whether to start or 164 * kill the cleaner process below. 165 */ 166 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 167 if (mntflags & MNT_UPDATE) { 168 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 169 err(1, "getmntinfo"); 170 for (i = 0; i < mntsize; i++) { 171 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 172 oldflags = mntbuf[i].f_flag; 173 break; 174 } 175 } 176 } 177 178 if (mount(MOUNT_LFS, fs_name, mntflags, &args, sizeof args) == -1) { 179 switch (errno) { 180 case EMFILE: 181 errcause = "mount table full"; 182 break; 183 case EINVAL: 184 if (mntflags & MNT_UPDATE) 185 errcause = 186 "specified device does not match mounted device"; 187 else 188 errcause = "incorrect super block"; 189 break; 190 default: 191 errcause = strerror(errno); 192 break; 193 } 194 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 195 } 196 197 #ifdef WANT_CLEANER 198 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 199 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY) 200 || (mntflags & MNT_GETARGS)) 201 noclean = 1; 202 if (!noclean) 203 invoke_cleaner(fs_name); 204 /* NOTREACHED */ 205 206 /* Downgrade to r/o; kill the cleaner */ 207 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 208 kill_cleaner(fs_name); 209 #else 210 __USE(oldflags); 211 #endif /* WANT_CLEANER */ 212 213 exit(0); 214 } 215 216 #ifdef WANT_CLEANER 217 static void 218 kill_daemon(char *pidname) 219 { 220 FILE *fp; 221 char s[80]; 222 pid_t pid; 223 224 fp = fopen(pidname, "r"); 225 if (fp) { 226 fgets(s, 80, fp); 227 pid = atoi(s); 228 if (pid) 229 kill(pid, SIGINT); 230 fclose(fp); 231 } 232 } 233 234 static void 235 kill_cleaner(char *name) 236 { 237 char *pidname; 238 char *cp; 239 int off; 240 241 /* Parent first */ 242 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 243 if (!pidname) 244 err(1, "malloc"); 245 off = strlen(_PATH_VARRUN); 246 while((cp = strchr(pidname + off, '/')) != NULL) 247 *cp = '|'; 248 kill_daemon(pidname); 249 free(pidname); 250 251 /* Then child */ 252 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 253 if (!pidname) 254 err(1, "malloc"); 255 off = strlen(_PATH_VARRUN); 256 while((cp = strchr(pidname + off, '/')) != NULL) 257 *cp = '|'; 258 kill_daemon(pidname); 259 free(pidname); 260 } 261 262 static void 263 invoke_cleaner(char *name) 264 { 265 const char *args[7], **ap = args; 266 267 /* Build the argument list. */ 268 *ap++ = _PATH_LFS_CLEANERD; 269 if (cleaner_bytes) 270 *ap++ = "-b"; 271 if (nsegs) { 272 *ap++ = "-n"; 273 *ap++ = nsegs; 274 } 275 if (short_rds) 276 *ap++ = "-s"; 277 if (cleaner_debug) 278 *ap++ = "-d"; 279 if (fs_idle) 280 *ap++ = "-f"; 281 *ap++ = name; 282 *ap = NULL; 283 284 execv(args[0], __UNCONST(args)); 285 err(1, "exec %s", _PATH_LFS_CLEANERD); 286 } 287 #endif /* WANT_CLEANER */ 288 289 static void 290 usage(void) 291 { 292 (void)fprintf(stderr, 293 "usage: %s [-bdins] [-N nsegs] [-o options] special node\n", 294 getprogname()); 295 exit(1); 296 } 297
Indexes created Fri Oct 03 02:09:57 GMT 2025