tunefs.c revision 1.15
1 /* $NetBSD: tunefs.c,v 1.15 1998/07/26 20:57:54 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 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) 1983, 1993\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[] = "@(#)tunefs.c 8.3 (Berkeley) 5/3/95"; 45 #else 46 __RCSID("$NetBSD: tunefs.c,v 1.15 1998/07/26 20:57:54 mycroft Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * tunefs: change layout parameters to an existing file system. 52 */ 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 56 #include <ufs/ufs/dinode.h> 57 #include <ufs/ffs/fs.h> 58 #include <ufs/ffs/ffs_extern.h> 59 60 #include <errno.h> 61 #include <err.h> 62 #include <fcntl.h> 63 #include <fstab.h> 64 #include <stdio.h> 65 #include <paths.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 70 /* the optimization warning string template */ 71 #define OPTWARN "should optimize for %s with minfree %s %d%%" 72 73 union { 74 struct fs sb; 75 char pad[MAXBSIZE]; 76 } sbun; 77 #define sblock sbun.sb 78 char buf[MAXBSIZE]; 79 80 int fi; 81 long dev_bsize = 1; 82 int needswap = 0; 83 84 void bwrite __P((daddr_t, char *, int)); 85 int bread __P((daddr_t, char *, int)); 86 void getsb __P((struct fs *, const char *)); 87 int main __P((int, char *[])); 88 void usage __P((void)); 89 90 int 91 main(argc, argv) 92 int argc; 93 char *argv[]; 94 { 95 char *cp, *name; 96 const char *special; 97 struct stat st; 98 int i; 99 int Aflag = 0, Nflag = 0; 100 struct fstab *fs; 101 char *chg[2], device[MAXPATHLEN]; 102 103 argc--, argv++; 104 if (argc < 2) 105 usage(); 106 special = argv[argc - 1]; 107 fs = getfsfile(special); 108 if (fs) 109 special = fs->fs_spec; 110 again: 111 if (stat(special, &st) < 0) { 112 if (*special != '/') { 113 if (*special == 'r') 114 special++; 115 (void)sprintf(device, "%s/%s", _PATH_DEV, special); 116 special = device; 117 goto again; 118 } 119 err(1, "%s", special); 120 } 121 if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) 122 errx(10, "%s: not a block or character device", special); 123 getsb(&sblock, special); 124 chg[FS_OPTSPACE] = "space"; 125 chg[FS_OPTTIME] = "time"; 126 for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { 127 for (cp = &argv[0][1]; *cp; cp++) 128 switch (*cp) { 129 130 case 'A': 131 Aflag++; 132 continue; 133 134 case 'N': 135 Nflag++; 136 continue; 137 138 case 'a': 139 name = "maximum contiguous block count"; 140 if (argc < 1) 141 errx(10, "-a: missing %s", name); 142 argc--, argv++; 143 i = atoi(*argv); 144 if (i < 1) 145 errx(10, "%s must be >= 1 (was %s)", 146 name, *argv); 147 warnx("%s changes from %d to %d", 148 name, sblock.fs_maxcontig, i); 149 sblock.fs_maxcontig = i; 150 continue; 151 152 case 'd': 153 name = 154 "rotational delay between contiguous blocks"; 155 if (argc < 1) 156 errx(10, "-d: missing %s", name); 157 argc--, argv++; 158 i = atoi(*argv); 159 warnx("%s changes from %dms to %dms", 160 name, sblock.fs_rotdelay, i); 161 sblock.fs_rotdelay = i; 162 continue; 163 164 case 'e': 165 name = 166 "maximum blocks per file in a cylinder group"; 167 if (argc < 1) 168 errx(10, "-e: missing %s", name); 169 argc--, argv++; 170 i = atoi(*argv); 171 if (i < 1) 172 errx(10, "%s must be >= 1 (was %s)", 173 name, *argv); 174 warnx("%s changes from %d to %d", 175 name, sblock.fs_maxbpg, i); 176 sblock.fs_maxbpg = i; 177 continue; 178 179 case 'm': 180 name = "minimum percentage of free space"; 181 if (argc < 1) 182 errx(10, "-m: missing %s", name); 183 argc--, argv++; 184 i = atoi(*argv); 185 if (i < 0 || i > 99) 186 errx(10, "bad %s (%s)", name, *argv); 187 warnx("%s changes from %d%% to %d%%", 188 name, sblock.fs_minfree, i); 189 sblock.fs_minfree = i; 190 if (i >= MINFREE && 191 sblock.fs_optim == FS_OPTSPACE) 192 warnx(OPTWARN, "time", ">=", MINFREE); 193 if (i < MINFREE && 194 sblock.fs_optim == FS_OPTTIME) 195 warnx(OPTWARN, "space", "<", MINFREE); 196 continue; 197 198 case 'o': 199 name = "optimization preference"; 200 if (argc < 1) 201 errx(10, "-o: missing %s", name); 202 argc--, argv++; 203 if (strcmp(*argv, chg[FS_OPTSPACE]) == 0) 204 i = FS_OPTSPACE; 205 else if (strcmp(*argv, chg[FS_OPTTIME]) == 0) 206 i = FS_OPTTIME; 207 else 208 errx(10, "bad %s (options are `space' or `time')", 209 name); 210 if (sblock.fs_optim == i) { 211 warnx("%s remains unchanged as %s", 212 name, chg[i]); 213 continue; 214 } 215 warnx("%s changes from %s to %s", 216 name, chg[sblock.fs_optim], chg[i]); 217 sblock.fs_optim = i; 218 if (sblock.fs_minfree >= MINFREE && 219 i == FS_OPTSPACE) 220 warnx(OPTWARN, "time", ">=", MINFREE); 221 if (sblock.fs_minfree < MINFREE && 222 i == FS_OPTTIME) 223 warnx(OPTWARN, "space", "<", MINFREE); 224 continue; 225 226 case 't': 227 name = "track skew in sectors"; 228 if (argc < 1) 229 errx(10, "-t: missing %s", name); 230 argc--, argv++; 231 i = atoi(*argv); 232 if (i < 0) 233 errx(10, "%s: %s must be >= 0", 234 *argv, name); 235 warnx("%s changes from %d to %d", 236 name, sblock.fs_trackskew, i); 237 sblock.fs_trackskew = i; 238 continue; 239 240 default: 241 usage(); 242 } 243 } 244 if (argc != 1) 245 usage(); 246 if (Nflag) { 247 fprintf(stdout, "tunefs: current settings\n"); 248 fprintf(stdout, "\tmaximum contiguous block count %d\n", 249 sblock.fs_maxcontig); 250 fprintf(stdout, 251 "\trotational delay between contiguous blocks %dms\n", 252 sblock.fs_rotdelay); 253 fprintf(stdout, 254 "\tmaximum blocks per file in a cylinder group %d\n", 255 sblock.fs_maxbpg); 256 fprintf(stdout, "\tminimum percentage of free space %d%%\n", 257 sblock.fs_minfree); 258 fprintf(stdout, "\toptimization preference: %s\n", 259 chg[sblock.fs_optim]); 260 fprintf(stdout, "\ttrack skew %d sectors\n", 261 sblock.fs_trackskew); 262 fprintf(stdout, "tunefs: no changes made\n"); 263 exit(0); 264 } 265 fi = open(special, 1); 266 if (fi < 0) 267 err(3, "cannot open %s for writing", special); 268 memcpy(buf, (char *)&sblock, SBSIZE); 269 if (needswap) 270 ffs_sb_swap((struct fs*)buf, (struct fs*)buf, 1); 271 bwrite((daddr_t)SBOFF / dev_bsize, buf, SBSIZE); 272 if (Aflag) 273 for (i = 0; i < sblock.fs_ncg; i++) 274 bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), 275 buf, SBSIZE); 276 close(fi); 277 exit(0); 278 } 279 280 void 281 usage() 282 { 283 284 fprintf(stderr, "Usage: tunefs [-AN] tuneup-options special-device\n"); 285 fprintf(stderr, "where tuneup-options are:\n"); 286 fprintf(stderr, "\t-d rotational delay between contiguous blocks\n"); 287 fprintf(stderr, "\t-a maximum contiguous blocks\n"); 288 fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); 289 fprintf(stderr, "\t-m minimum percentage of free space\n"); 290 fprintf(stderr, "\t-o optimization preference (`space' or `time')\n"); 291 fprintf(stderr, "\t-t track skew in sectors\n"); 292 exit(2); 293 } 294 295 void 296 getsb(fs, file) 297 struct fs *fs; 298 const char *file; 299 { 300 301 fi = open(file, 0); 302 if (fi < 0) 303 err(3, "cannot open %s for reading", file); 304 if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) 305 err(4, "%s: bad super block", file); 306 if (fs->fs_magic != FS_MAGIC) 307 if (fs->fs_magic == bswap32(FS_MAGIC)) { 308 needswap = 1; 309 ffs_sb_swap(fs, fs, 0); 310 } else 311 err(5, "%s: bad magic number", file); 312 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 313 close(fi); 314 } 315 316 void 317 bwrite(blk, buf, size) 318 daddr_t blk; 319 char *buf; 320 int size; 321 { 322 323 if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) 324 err(6, "FS SEEK"); 325 if (write(fi, buf, size) != size) 326 err(7, "FS WRITE"); 327 } 328 329 int 330 bread(bno, buf, cnt) 331 daddr_t bno; 332 char *buf; 333 int cnt; 334 { 335 int i; 336 337 if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) 338 return(1); 339 if ((i = read(fi, buf, cnt)) != cnt) { 340 for(i=0; i<sblock.fs_bsize; i++) 341 buf[i] = 0; 342 return (1); 343 } 344 return (0); 345 } 346
Indexes created Tue Sep 30 20:09:53 GMT 2025