mount_lfs.c revision 1.18
1 /* $NetBSD: mount_lfs.c,v 1.18 2003/08/07 10:04:28 agc 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 1.18 2003/08/07 10:04:28 agc 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, *options; 100 101 const char *errcause; 102 struct statfs *mntbuf; 103 104 options = NULL; 105 nsegs = "4"; 106 mntflags = noclean = 0; 107 cleaner_bytes = 1; 108 while ((ch = getopt(argc, argv, "bdN:no:s")) != -1) 109 switch (ch) { 110 case 'b': 111 cleaner_bytes = !cleaner_bytes; 112 break; 113 case 'd': 114 cleaner_debug = 1; 115 break; 116 case 'n': 117 noclean = 1; 118 break; 119 case 'N': 120 nsegs = optarg; 121 break; 122 case 'o': 123 getmntopts(optarg, mopts, &mntflags, 0); 124 break; 125 case 's': 126 short_rds = 1; 127 break; 128 case '?': 129 default: 130 usage(); 131 } 132 argc -= optind; 133 argv += optind; 134 135 if (argc != 2) 136 usage(); 137 138 args.fspec = argv[0]; /* the name of the device file */ 139 fs_name = argv[1]; /* the mount point */ 140 141 #define DEFAULT_ROOTUID -2 142 args.export.ex_root = DEFAULT_ROOTUID; 143 if (mntflags & MNT_RDONLY) { 144 args.export.ex_flags = MNT_EXRDONLY; 145 noclean = 1; 146 } else 147 args.export.ex_flags = 0; 148 149 /* 150 * Record the previous status of this filesystem (if any) before 151 * performing the mount, so we can know whether to start or 152 * kill the cleaner process below. 153 */ 154 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 155 if (mntflags & MNT_UPDATE) { 156 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 157 err(1, "getmntinfo"); 158 for (i = 0; i < mntsize; i++) { 159 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 160 oldflags = mntbuf[i].f_flags; 161 break; 162 } 163 } 164 } 165 166 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 167 switch (errno) { 168 case EMFILE: 169 errcause = "mount table full"; 170 break; 171 case EINVAL: 172 if (mntflags & MNT_UPDATE) 173 errcause = 174 "specified device does not match mounted device"; 175 else 176 errcause = "incorrect super block"; 177 break; 178 default: 179 errcause = strerror(errno); 180 break; 181 } 182 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 183 } 184 185 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 186 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 187 noclean = 1; 188 if (!noclean) 189 invoke_cleaner(fs_name); 190 /* NOTREACHED */ 191 192 /* Downgrade to r/o; kill the cleaner */ 193 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 194 kill_cleaner(fs_name); 195 196 exit(0); 197 } 198 199 static void 200 kill_daemon(pidname) 201 char *pidname; 202 { 203 FILE *fp; 204 char s[80]; 205 pid_t pid; 206 207 fp = fopen(pidname, "r"); 208 if (fp) { 209 fgets(s, 80, fp); 210 pid = atoi(s); 211 if (pid) 212 kill(pid, SIGINT); 213 fclose(fp); 214 } 215 } 216 217 static void 218 kill_cleaner(name) 219 char *name; 220 { 221 char *pidname; 222 char *cp; 223 int off; 224 225 /* Parent first */ 226 asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 227 if (!pidname) 228 err(1, "malloc"); 229 off = strlen(_PATH_VARRUN); 230 while((cp = strchr(pidname + off, '/')) != NULL) 231 *cp = '|'; 232 kill_daemon(pidname); 233 free(pidname); 234 235 /* Then child */ 236 asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 237 if (!pidname) 238 err(1, "malloc"); 239 off = strlen(_PATH_VARRUN); 240 while((cp = strchr(pidname + off, '/')) != NULL) 241 *cp = '|'; 242 kill_daemon(pidname); 243 free(pidname); 244 } 245 246 static void 247 invoke_cleaner(name) 248 char *name; 249 { 250 char *args[6], **ap = args; 251 252 /* Build the argument list. */ 253 *ap++ = _PATH_LFS_CLEANERD; 254 if (cleaner_bytes) 255 *ap++ = "-b"; 256 if (nsegs) { 257 *ap++ = "-n"; 258 *ap++ = nsegs; 259 } 260 if (short_rds) 261 *ap++ = "-s"; 262 if (cleaner_debug) 263 *ap++ = "-d"; 264 *ap++ = name; 265 *ap = NULL; 266 267 execv(args[0], args); 268 err(1, "exec %s", _PATH_LFS_CLEANERD); 269 } 270 271 static void 272 usage() 273 { 274 (void)fprintf(stderr, 275 "usage: mount_lfs [-dns] [-o options] special node\n"); 276 exit(1); 277 } 278
Indexes created Fri Oct 03 02:09:57 GMT 2025