mount_lfs.c revision 1.22
1 /* $NetBSD: mount_lfs.c,v 1.22 2005/02/09 14:31:29 xtraeme 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 1.22 2005/02/09 14:31:29 xtraeme 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 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; 79 static 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 97 const char *errcause; 98 struct statvfs *mntbuf; 99 100 options = NULL; 101 nsegs = "4"; 102 mntflags = noclean = 0; 103 cleaner_bytes = 1; 104 while ((ch = getopt(argc, argv, "bdN:no:s")) != -1) 105 switch (ch) { 106 case 'b': 107 cleaner_bytes = !cleaner_bytes; 108 break; 109 case 'd': 110 cleaner_debug = 1; 111 break; 112 case 'n': 113 noclean = 1; 114 break; 115 case 'N': 116 nsegs = optarg; 117 break; 118 case 'o': 119 getmntopts(optarg, mopts, &mntflags, 0); 120 break; 121 case 's': 122 short_rds = 1; 123 break; 124 case '?': 125 default: 126 usage(); 127 } 128 argc -= optind; 129 argv += optind; 130 131 if (argc != 2) 132 usage(); 133 134 if (realpath(argv[0], canon_dev) == NULL) /* Check device path */ 135 err(1, "realpath %s", argv[0]); 136 if (strncmp(argv[0], canon_dev, MAXPATHLEN)) { 137 warnx("\"%s\" is a relative path.", argv[0]); 138 warnx("using \"%s\" instead.", canon_dev); 139 } 140 args.fspec = canon_dev; 141 142 if (realpath(argv[1], fs_name) == NULL) /* Check mounton path */ 143 err(1, "realpath %s", argv[1]); 144 if (strncmp(argv[1], fs_name, MAXPATHLEN)) { 145 warnx("\"%s\" is a relative path.", argv[1]); 146 warnx("using \"%s\" instead.", fs_name); 147 } 148 149 #define DEFAULT_ROOTUID -2 150 args.export.ex_root = DEFAULT_ROOTUID; 151 if (mntflags & MNT_RDONLY) { 152 args.export.ex_flags = MNT_EXRDONLY; 153 noclean = 1; 154 } else 155 args.export.ex_flags = 0; 156 157 /* 158 * Record the previous status of this filesystem (if any) before 159 * performing the mount, so we can know whether to start or 160 * kill the cleaner process below. 161 */ 162 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 163 if (mntflags & MNT_UPDATE) { 164 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 165 err(1, "getmntinfo"); 166 for (i = 0; i < mntsize; i++) { 167 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 168 oldflags = mntbuf[i].f_flag; 169 break; 170 } 171 } 172 } 173 174 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 175 switch (errno) { 176 case EMFILE: 177 errcause = "mount table full"; 178 break; 179 case EINVAL: 180 if (mntflags & MNT_UPDATE) 181 errcause = 182 "specified device does not match mounted device"; 183 else 184 errcause = "incorrect super block"; 185 break; 186 default: 187 errcause = strerror(errno); 188 break; 189 } 190 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 191 } 192 193 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 194 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 195 noclean = 1; 196 if (!noclean) 197 invoke_cleaner(fs_name); 198 /* NOTREACHED */ 199 200 /* Downgrade to r/o; kill the cleaner */ 201 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 202 kill_cleaner(fs_name); 203 204 exit(0); 205 } 206 207 static void 208 kill_daemon(char *pidname) 209 { 210 FILE *fp; 211 char s[80]; 212 pid_t pid; 213 214 fp = fopen(pidname, "r"); 215 if (fp) { 216 fgets(s, 80, fp); 217 pid = atoi(s); 218 if (pid) 219 kill(pid, SIGINT); 220 fclose(fp); 221 } 222 } 223 224 static void 225 kill_cleaner(char *name) 226 { 227 char *pidname; 228 char *cp; 229 int off; 230 231 /* Parent first */ 232 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 233 if (!pidname) 234 err(1, "malloc"); 235 off = strlen(_PATH_VARRUN); 236 while((cp = strchr(pidname + off, '/')) != NULL) 237 *cp = '|'; 238 kill_daemon(pidname); 239 free(pidname); 240 241 /* Then child */ 242 asprintf(&pidname, "%slfs_cleanerd:s:%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 } 251 252 static void 253 invoke_cleaner(char *name) 254 { 255 char *args[6], **ap = args; 256 257 /* Build the argument list. */ 258 *ap++ = _PATH_LFS_CLEANERD; 259 if (cleaner_bytes) 260 *ap++ = "-b"; 261 if (nsegs) { 262 *ap++ = "-n"; 263 *ap++ = nsegs; 264 } 265 if (short_rds) 266 *ap++ = "-s"; 267 if (cleaner_debug) 268 *ap++ = "-d"; 269 *ap++ = name; 270 *ap = NULL; 271 272 execv(args[0], args); 273 err(1, "exec %s", _PATH_LFS_CLEANERD); 274 } 275 276 static void 277 usage(void) 278 { 279 (void)fprintf(stderr, 280 "usage: %s [-bdns] [-N nsegs] [-o options] special node\n", 281 getprogname()); 282 exit(1); 283 } 284
Indexes created Fri Oct 03 02:09:57 GMT 2025