mount_lfs.c revision 1.28
1 /* $NetBSD: mount_lfs.c,v 1.28 2006/10/16 03:37:42 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\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 1.28 2006/10/16 03:37:42 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 64 static const struct mntopt mopts[] = { 65 MOPT_STDOPTS, 66 MOPT_UPDATE, 67 MOPT_GETARGS, 68 MOPT_NOATIME, 69 MOPT_NULL, 70 }; 71 72 int mount_lfs(int, char *[]); 73 static void invoke_cleaner(char *); 74 static void usage(void); 75 static void kill_daemon(char *); 76 static void kill_cleaner(char *); 77 78 static int short_rds, cleaner_debug, cleaner_bytes, fs_idle; 79 static const char *nsegs; 80 81 #ifndef MOUNT_NOMAIN 82 int 83 main(int argc, char **argv) 84 { 85 return mount_lfs(argc, argv); 86 } 87 #endif 88 89 int 90 mount_lfs(int argc, char *argv[]) 91 { 92 struct ufs_args args; 93 int ch, mntflags, noclean, mntsize, oldflags, i; 94 char fs_name[MAXPATHLEN], canon_dev[MAXPATHLEN]; 95 char *options; 96 mntoptparse_t mp; 97 98 const char *errcause; 99 struct statvfs *mntbuf; 100 101 options = NULL; 102 nsegs = "4"; 103 mntflags = noclean = 0; 104 cleaner_bytes = 1; 105 while ((ch = getopt(argc, argv, "bdiN:no:s")) != -1) 106 switch (ch) { 107 case 'b': 108 cleaner_bytes = !cleaner_bytes; 109 break; 110 case 'd': 111 cleaner_debug = 1; 112 break; 113 case 'i': 114 fs_idle = 1; 115 break; 116 case 'n': 117 noclean = 1; 118 break; 119 case 'N': 120 nsegs = optarg; 121 break; 122 case 'o': 123 mp = getmntopts(optarg, mopts, &mntflags, 0); 124 if (mp == NULL) 125 err(1, "getmntopts"); 126 freemntopts(mp); 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 if (realpath(argv[0], canon_dev) == NULL) /* Check device path */ 142 err(1, "realpath %s", argv[0]); 143 if (strncmp(argv[0], canon_dev, MAXPATHLEN)) { 144 warnx("\"%s\" is a relative path.", argv[0]); 145 warnx("using \"%s\" instead.", canon_dev); 146 } 147 args.fspec = canon_dev; 148 149 if (realpath(argv[1], fs_name) == NULL) /* Check mounton path */ 150 err(1, "realpath %s", argv[1]); 151 if (strncmp(argv[1], fs_name, MAXPATHLEN)) { 152 warnx("\"%s\" is a relative path.", argv[1]); 153 warnx("using \"%s\" instead.", fs_name); 154 } 155 156 /* 157 * Record the previous status of this filesystem (if any) before 158 * performing the mount, so we can know whether to start or 159 * kill the cleaner process below. 160 */ 161 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 162 if (mntflags & MNT_UPDATE) { 163 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 164 err(1, "getmntinfo"); 165 for (i = 0; i < mntsize; i++) { 166 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 167 oldflags = mntbuf[i].f_flag; 168 break; 169 } 170 } 171 } 172 173 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 174 switch (errno) { 175 case EMFILE: 176 errcause = "mount table full"; 177 break; 178 case EINVAL: 179 if (mntflags & MNT_UPDATE) 180 errcause = 181 "specified device does not match mounted device"; 182 else 183 errcause = "incorrect super block"; 184 break; 185 default: 186 errcause = strerror(errno); 187 break; 188 } 189 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 190 } 191 192 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 193 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 194 noclean = 1; 195 if (!noclean) 196 invoke_cleaner(fs_name); 197 /* NOTREACHED */ 198 199 /* Downgrade to r/o; kill the cleaner */ 200 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 201 kill_cleaner(fs_name); 202 203 exit(0); 204 } 205 206 static void 207 kill_daemon(char *pidname) 208 { 209 FILE *fp; 210 char s[80]; 211 pid_t pid; 212 213 fp = fopen(pidname, "r"); 214 if (fp) { 215 fgets(s, 80, fp); 216 pid = atoi(s); 217 if (pid) 218 kill(pid, SIGINT); 219 fclose(fp); 220 } 221 } 222 223 static void 224 kill_cleaner(char *name) 225 { 226 char *pidname; 227 char *cp; 228 int off; 229 230 /* Parent first */ 231 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 232 if (!pidname) 233 err(1, "malloc"); 234 off = strlen(_PATH_VARRUN); 235 while((cp = strchr(pidname + off, '/')) != NULL) 236 *cp = '|'; 237 kill_daemon(pidname); 238 free(pidname); 239 240 /* Then child */ 241 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 242 if (!pidname) 243 err(1, "malloc"); 244 off = strlen(_PATH_VARRUN); 245 while((cp = strchr(pidname + off, '/')) != NULL) 246 *cp = '|'; 247 kill_daemon(pidname); 248 free(pidname); 249 } 250 251 static void 252 invoke_cleaner(char *name) 253 { 254 const char *args[7], **ap = args; 255 256 /* Build the argument list. */ 257 *ap++ = _PATH_LFS_CLEANERD; 258 if (cleaner_bytes) 259 *ap++ = "-b"; 260 if (nsegs) { 261 *ap++ = "-n"; 262 *ap++ = nsegs; 263 } 264 if (short_rds) 265 *ap++ = "-s"; 266 if (cleaner_debug) 267 *ap++ = "-d"; 268 if (fs_idle) 269 *ap++ = "-f"; 270 *ap++ = name; 271 *ap = NULL; 272 273 execv(args[0], __UNCONST(args)); 274 err(1, "exec %s", _PATH_LFS_CLEANERD); 275 } 276 277 static void 278 usage(void) 279 { 280 (void)fprintf(stderr, 281 "usage: %s [-bdins] [-N nsegs] [-o options] special node\n", 282 getprogname()); 283 exit(1); 284 } 285
Indexes created Fri Oct 03 02:09:57 GMT 2025