mount_lfs.c revision 1.16
1 /* $NetBSD: mount_lfs.c,v 1.16 2003/03/22 11:15:50 jdolecek 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)mount_lfs.c 8.4 (Berkeley) 4/26/95"; 45 #else 46 __RCSID("$NetBSD: mount_lfs.c,v 1.16 2003/03/22 11:15:50 jdolecek Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/mount.h> 52 53 #include <ufs/ufs/ufsmount.h> 54 55 #include <err.h> 56 #include <errno.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #include <paths.h> 62 63 #include <signal.h> 64 65 #include <mntopts.h> 66 #include "pathnames.h" 67 68 static const struct mntopt mopts[] = { 69 MOPT_STDOPTS, 70 MOPT_UPDATE, 71 MOPT_GETARGS, 72 MOPT_NOATIME, 73 { NULL } 74 }; 75 76 int main __P((int, char *[])); 77 int mount_lfs __P((int, char *[])); 78 static void invoke_cleaner __P((char *)); 79 static void usage __P((void)); 80 static void kill_daemon __P((char *)); 81 static void kill_cleaner __P((char *)); 82 83 static int short_rds, cleaner_debug, cleaner_bytes; 84 static char *nsegs; 85 86 #ifndef MOUNT_NOMAIN 87 int 88 main(argc, argv) 89 int argc; 90 char **argv; 91 { 92 return mount_lfs(argc, argv); 93 } 94 #endif 95 96 int 97 mount_lfs(argc, argv) 98 int argc; 99 char *argv[]; 100 { 101 struct ufs_args args; 102 int ch, mntflags, noclean, mntsize, oldflags, i; 103 char *fs_name, *options; 104 105 const char *errcause; 106 struct statfs *mntbuf; 107 108 options = NULL; 109 nsegs = "4"; 110 mntflags = noclean = 0; 111 cleaner_bytes = 1; 112 while ((ch = getopt(argc, argv, "bdN:no:s")) != -1) 113 switch (ch) { 114 case 'b': 115 cleaner_bytes = !cleaner_bytes; 116 break; 117 case 'd': 118 cleaner_debug = 1; 119 break; 120 case 'n': 121 noclean = 1; 122 break; 123 case 'N': 124 nsegs = optarg; 125 break; 126 case 'o': 127 getmntopts(optarg, mopts, &mntflags, 0); 128 break; 129 case 's': 130 short_rds = 1; 131 break; 132 case '?': 133 default: 134 usage(); 135 } 136 argc -= optind; 137 argv += optind; 138 139 if (argc != 2) 140 usage(); 141 142 args.fspec = argv[0]; /* the name of the device file */ 143 fs_name = argv[1]; /* the mount point */ 144 145 #define DEFAULT_ROOTUID -2 146 args.export.ex_root = DEFAULT_ROOTUID; 147 if (mntflags & MNT_RDONLY) { 148 args.export.ex_flags = MNT_EXRDONLY; 149 noclean = 1; 150 } else 151 args.export.ex_flags = 0; 152 153 /* 154 * Record the previous status of this filesystem (if any) before 155 * performing the mount, so we can know whether to start or 156 * kill the cleaner process below. 157 */ 158 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 159 if (mntflags & MNT_UPDATE) { 160 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 161 err(1, "getmntinfo"); 162 for (i = 0; i < mntsize; i++) { 163 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 164 oldflags = mntbuf[i].f_flags; 165 break; 166 } 167 } 168 } 169 170 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 171 switch (errno) { 172 case EMFILE: 173 errcause = "mount table full"; 174 break; 175 case EINVAL: 176 if (mntflags & MNT_UPDATE) 177 errcause = 178 "specified device does not match mounted device"; 179 else 180 errcause = "incorrect super block"; 181 break; 182 default: 183 errcause = strerror(errno); 184 break; 185 } 186 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 187 } 188 189 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 190 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 191 noclean = 1; 192 if (!noclean) 193 invoke_cleaner(fs_name); 194 /* NOTREACHED */ 195 196 /* Downgrade to r/o; kill the cleaner */ 197 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 198 kill_cleaner(fs_name); 199 200 exit(0); 201 } 202 203 static void 204 kill_daemon(pidname) 205 char *pidname; 206 { 207 FILE *fp; 208 char s[80]; 209 pid_t pid; 210 211 fp = fopen(pidname, "r"); 212 if (fp) { 213 fgets(s, 80, fp); 214 pid = atoi(s); 215 if (pid) 216 kill(pid, SIGINT); 217 fclose(fp); 218 } 219 } 220 221 static void 222 kill_cleaner(name) 223 char *name; 224 { 225 char *pidname; 226 char *cp; 227 int off; 228 229 /* Parent first */ 230 pidname = malloc(strlen(name) + 20 + strlen(_PATH_VARRUN)); 231 sprintf(pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 232 off = strlen(_PATH_VARRUN); 233 while((cp = strchr(pidname + off, '/')) != NULL) 234 *cp = '|'; 235 kill_daemon(pidname); 236 237 /* Then child */ 238 sprintf(pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 239 off = strlen(_PATH_VARRUN); 240 while((cp = strchr(pidname + off, '/')) != NULL) 241 *cp = '|'; 242 kill_daemon(pidname); 243 } 244 245 static void 246 invoke_cleaner(name) 247 char *name; 248 { 249 char *args[6], **ap = args; 250 251 /* Build the argument list. */ 252 *ap++ = _PATH_LFS_CLEANERD; 253 if (cleaner_bytes) 254 *ap++ = "-b"; 255 if (nsegs) { 256 *ap++ = "-n"; 257 *ap++ = nsegs; 258 } 259 if (short_rds) 260 *ap++ = "-s"; 261 if (cleaner_debug) 262 *ap++ = "-d"; 263 *ap++ = name; 264 *ap = NULL; 265 266 execv(args[0], args); 267 err(1, "exec %s", _PATH_LFS_CLEANERD); 268 } 269 270 static void 271 usage() 272 { 273 (void)fprintf(stderr, 274 "usage: mount_lfs [-dns] [-o options] special node\n"); 275 exit(1); 276 } 277
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