mount_lfs.c revision 1.25
1 /* $NetBSD: mount_lfs.c,v 1.25 2005/06/27 02:56:20 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 1.25 2005/06/27 02:56:20 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 { 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 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, "bdiN: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 'i': 113 fs_idle = 1; 114 break; 115 case 'n': 116 noclean = 1; 117 break; 118 case 'N': 119 nsegs = optarg; 120 break; 121 case 'o': 122 getmntopts(optarg, mopts, &mntflags, 0); 123 break; 124 case 's': 125 short_rds = 1; 126 break; 127 case '?': 128 default: 129 usage(); 130 } 131 argc -= optind; 132 argv += optind; 133 134 if (argc != 2) 135 usage(); 136 137 if (realpath(argv[0], canon_dev) == NULL) /* Check device path */ 138 err(1, "realpath %s", argv[0]); 139 if (strncmp(argv[0], canon_dev, MAXPATHLEN)) { 140 warnx("\"%s\" is a relative path.", argv[0]); 141 warnx("using \"%s\" instead.", canon_dev); 142 } 143 args.fspec = canon_dev; 144 145 if (realpath(argv[1], fs_name) == NULL) /* Check mounton path */ 146 err(1, "realpath %s", argv[1]); 147 if (strncmp(argv[1], fs_name, MAXPATHLEN)) { 148 warnx("\"%s\" is a relative path.", argv[1]); 149 warnx("using \"%s\" instead.", fs_name); 150 } 151 152 #define DEFAULT_ROOTUID -2 153 args.export.ex_root = DEFAULT_ROOTUID; 154 if (mntflags & MNT_RDONLY) { 155 args.export.ex_flags = MNT_EXRDONLY; 156 noclean = 1; 157 } else 158 args.export.ex_flags = 0; 159 160 /* 161 * Record the previous status of this filesystem (if any) before 162 * performing the mount, so we can know whether to start or 163 * kill the cleaner process below. 164 */ 165 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 166 if (mntflags & MNT_UPDATE) { 167 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 168 err(1, "getmntinfo"); 169 for (i = 0; i < mntsize; i++) { 170 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 171 oldflags = mntbuf[i].f_flag; 172 break; 173 } 174 } 175 } 176 177 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 178 switch (errno) { 179 case EMFILE: 180 errcause = "mount table full"; 181 break; 182 case EINVAL: 183 if (mntflags & MNT_UPDATE) 184 errcause = 185 "specified device does not match mounted device"; 186 else 187 errcause = "incorrect super block"; 188 break; 189 default: 190 errcause = strerror(errno); 191 break; 192 } 193 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 194 } 195 196 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 197 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 198 noclean = 1; 199 if (!noclean) 200 invoke_cleaner(fs_name); 201 /* NOTREACHED */ 202 203 /* Downgrade to r/o; kill the cleaner */ 204 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 205 kill_cleaner(fs_name); 206 207 exit(0); 208 } 209 210 static void 211 kill_daemon(char *pidname) 212 { 213 FILE *fp; 214 char s[80]; 215 pid_t pid; 216 217 fp = fopen(pidname, "r"); 218 if (fp) { 219 fgets(s, 80, fp); 220 pid = atoi(s); 221 if (pid) 222 kill(pid, SIGINT); 223 fclose(fp); 224 } 225 } 226 227 static void 228 kill_cleaner(char *name) 229 { 230 char *pidname; 231 char *cp; 232 int off; 233 234 /* Parent first */ 235 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 236 if (!pidname) 237 err(1, "malloc"); 238 off = strlen(_PATH_VARRUN); 239 while((cp = strchr(pidname + off, '/')) != NULL) 240 *cp = '|'; 241 kill_daemon(pidname); 242 free(pidname); 243 244 /* Then child */ 245 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 246 if (!pidname) 247 err(1, "malloc"); 248 off = strlen(_PATH_VARRUN); 249 while((cp = strchr(pidname + off, '/')) != NULL) 250 *cp = '|'; 251 kill_daemon(pidname); 252 free(pidname); 253 } 254 255 static void 256 invoke_cleaner(char *name) 257 { 258 const char *args[7], **ap = args; 259 260 /* Build the argument list. */ 261 *ap++ = _PATH_LFS_CLEANERD; 262 if (cleaner_bytes) 263 *ap++ = "-b"; 264 if (nsegs) { 265 *ap++ = "-n"; 266 *ap++ = nsegs; 267 } 268 if (short_rds) 269 *ap++ = "-s"; 270 if (cleaner_debug) 271 *ap++ = "-d"; 272 if (fs_idle) 273 *ap++ = "-f"; 274 *ap++ = name; 275 *ap = NULL; 276 277 execv(args[0], __UNCONST(args)); 278 err(1, "exec %s", _PATH_LFS_CLEANERD); 279 } 280 281 static void 282 usage(void) 283 { 284 (void)fprintf(stderr, 285 "usage: %s [-bdins] [-N nsegs] [-o options] special node\n", 286 getprogname()); 287 exit(1); 288 } 289
Indexes created Fri Oct 03 02:09:57 GMT 2025