1 /* 2 * Copyright (c) 1980, 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)mkfs.c 6.14 (Berkeley) 06/01/90"; 10 #endif /* not lint */ 11 12 #ifndef STANDALONE 13 #include <stdio.h> 14 #include <a.out.h> 15 #endif 16 17 #include <sys/param.h> 18 #include <sys/time.h> 19 #include <sys/wait.h> 20 #include <sys/resource.h> 21 #include <ufs/dinode.h> 22 #include <ufs/fs.h> 23 #include <ufs/dir.h> 24 #include <sys/disklabel.h> 25 #include <machine/endian.h> 26 27 /* 28 * make file system for cylinder-group style file systems 29 */ 30 31 /* 32 * The size of a cylinder group is calculated by CGSIZE. The maximum size 33 * is limited by the fact that cylinder groups are at most one block. 34 * Its size is derived from the size of the maps maintained in the 35 * cylinder group and the (struct cg) size. 36 */ 37 #define CGSIZE(fs) \ 38 /* base cg */ (sizeof(struct cg) + \ 39 /* blktot size */ (fs)->fs_cpg * sizeof(long) + \ 40 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(short) + \ 41 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 42 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY)) 43 44 /* 45 * We limit the size of the inode map to be no more than a 46 * third of the cylinder group space, since we must leave at 47 * least an equal amount of space for the block map. 48 * 49 * N.B.: MAXIPG must be a multiple of INOPB(fs). 50 */ 51 #define MAXIPG(fs) roundup((fs)->fs_bsize * NBBY / 3, INOPB(fs)) 52 53 #define UMASK 0755 54 #define MAXINOPB (MAXBSIZE / sizeof(struct dinode)) 55 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 56 57 /* 58 * variables set up by front end. 59 */ 60 extern int mfs; /* run as the memory based filesystem */ 61 extern int Nflag; /* run mkfs without writing file system */ 62 extern int fssize; /* file system size */ 63 extern int ntracks; /* # tracks/cylinder */ 64 extern int nsectors; /* # sectors/track */ 65 extern int nphyssectors; /* # sectors/track including spares */ 66 extern int secpercyl; /* sectors per cylinder */ 67 extern int sectorsize; /* bytes/sector */ 68 extern int rpm; /* revolutions/minute of drive */ 69 extern int interleave; /* hardware sector interleave */ 70 extern int trackskew; /* sector 0 skew, per track */ 71 extern int headswitch; /* head switch time, usec */ 72 extern int trackseek; /* track-to-track seek, usec */ 73 extern int fsize; /* fragment size */ 74 extern int bsize; /* block size */ 75 extern int cpg; /* cylinders/cylinder group */ 76 extern int cpgflg; /* cylinders/cylinder group flag was given */ 77 extern int minfree; /* free space threshold */ 78 extern int opt; /* optimization preference (space or time) */ 79 extern int density; /* number of bytes per inode */ 80 extern int maxcontig; /* max contiguous blocks to allocate */ 81 extern int rotdelay; /* rotational delay between blocks */ 82 extern int maxbpg; /* maximum blocks per file in a cyl group */ 83 extern int nrpos; /* # of distinguished rotational positions */ 84 extern int bbsize; /* boot block size */ 85 extern int sbsize; /* superblock size */ 86 extern u_long memleft; /* virtual memory available */ 87 extern caddr_t membase; /* start address of memory based filesystem */ 88 extern caddr_t malloc(), calloc(); 89 90 union { 91 struct fs fs; 92 char pad[SBSIZE]; 93 } fsun; 94 #define sblock fsun.fs 95 struct csum *fscs; 96 97 union { 98 struct cg cg; 99 char pad[MAXBSIZE]; 100 } cgun; 101 #define acg cgun.cg 102 103 struct dinode zino[MAXBSIZE / sizeof(struct dinode)]; 104 105 int fsi, fso; 106 time_t utime; 107 daddr_t alloc(); 108 109 mkfs(pp, fsys, fi, fo) 110 struct partition *pp; 111 char *fsys; 112 int fi, fo; 113 { 114 register long i, mincpc, mincpg, inospercg; 115 long cylno, rpos, blk, j, warn = 0; 116 long used, mincpgcnt, bpcg; 117 long mapcramped, inodecramped; 118 long postblsize, rotblsize, totalsbsize; 119 int ppid, status, started(); 120 121 #ifndef STANDALONE 122 time(&utime); 123 #endif 124 if (mfs) { 125 ppid = getpid(); 126 (void) signal(SIGUSR1, started); 127 if (i = fork()) { 128 if (i == -1) { 129 perror("mfs"); 130 exit(10); 131 } 132 if (waitpid(i, &status, 0) != -1 && WIFEXITED(status)) 133 exit(WEXITSTATUS(status)); 134 exit(11); 135 /* NOTREACHED */ 136 } 137 (void)malloc(0); 138 if (fssize * sectorsize > memleft) 139 fssize = (memleft - 16384) / sectorsize; 140 if ((membase = malloc(fssize * sectorsize)) == 0) 141 exit(12); 142 } 143 fsi = fi; 144 fso = fo; 145 /* 146 * Validate the given file system size. 147 * Verify that its last block can actually be accessed. 148 */ 149 if (fssize <= 0) 150 printf("preposterous size %d\n", fssize), exit(13); 151 wtfs(fssize - 1, sectorsize, (char *)&sblock); 152 /* 153 * collect and verify the sector and track info 154 */ 155 sblock.fs_nsect = nsectors; 156 sblock.fs_ntrak = ntracks; 157 if (sblock.fs_ntrak <= 0) 158 printf("preposterous ntrak %d\n", sblock.fs_ntrak), exit(14); 159 if (sblock.fs_nsect <= 0) 160 printf("preposterous nsect %d\n", sblock.fs_nsect), exit(15); 161 /* 162 * collect and verify the block and fragment sizes 163 */ 164 sblock.fs_bsize = bsize; 165 sblock.fs_fsize = fsize; 166 if (!POWEROF2(sblock.fs_bsize)) { 167 printf("block size must be a power of 2, not %d\n", 168 sblock.fs_bsize); 169 exit(16); 170 } 171 if (!POWEROF2(sblock.fs_fsize)) { 172 printf("fragment size must be a power of 2, not %d\n", 173 sblock.fs_fsize); 174 exit(17); 175 } 176 if (sblock.fs_fsize < sectorsize) { 177 printf("fragment size %d is too small, minimum is %d\n", 178 sblock.fs_fsize, sectorsize); 179 exit(18); 180 } 181 if (sblock.fs_bsize < MINBSIZE) { 182 printf("block size %d is too small, minimum is %d\n", 183 sblock.fs_bsize, MINBSIZE); 184 exit(19); 185 } 186 if (sblock.fs_bsize < sblock.fs_fsize) { 187 printf("block size (%d) cannot be smaller than fragment size (%d)\n", 188 sblock.fs_bsize, sblock.fs_fsize); 189 exit(20); 190 } 191 sblock.fs_bmask = ~(sblock.fs_bsize - 1); 192 sblock.fs_fmask = ~(sblock.fs_fsize - 1); 193 /* 194 * Planning now for future expansion. 195 */ 196 # if (BYTE_ORDER == BIG_ENDIAN) 197 sblock.fs_qbmask.val[0] = 0; 198 sblock.fs_qbmask.val[1] = ~sblock.fs_bmask; 199 sblock.fs_qfmask.val[0] = 0; 200 sblock.fs_qfmask.val[1] = ~sblock.fs_fmask; 201 # endif /* BIG_ENDIAN */ 202 # if (BYTE_ORDER == LITTLE_ENDIAN) 203 sblock.fs_qbmask.val[0] = ~sblock.fs_bmask; 204 sblock.fs_qbmask.val[1] = 0; 205 sblock.fs_qfmask.val[0] = ~sblock.fs_fmask; 206 sblock.fs_qfmask.val[1] = 0; 207 # endif /* LITTLE_ENDIAN */ 208 for (sblock.fs_bshift = 0, i = sblock.fs_bsize; i > 1; i >>= 1) 209 sblock.fs_bshift++; 210 for (sblock.fs_fshift = 0, i = sblock.fs_fsize; i > 1; i >>= 1) 211 sblock.fs_fshift++; 212 sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize); 213 for (sblock.fs_fragshift = 0, i = sblock.fs_frag; i > 1; i >>= 1) 214 sblock.fs_fragshift++; 215 if (sblock.fs_frag > MAXFRAG) { 216 printf("fragment size %d is too small, minimum with block size %d is %d\n", 217 sblock.fs_fsize, sblock.fs_bsize, 218 sblock.fs_bsize / MAXFRAG); 219 exit(21); 220 } 221 sblock.fs_nrpos = nrpos; 222 sblock.fs_nindir = sblock.fs_bsize / sizeof(daddr_t); 223 sblock.fs_inopb = sblock.fs_bsize / sizeof(struct dinode); 224 sblock.fs_nspf = sblock.fs_fsize / sectorsize; 225 for (sblock.fs_fsbtodb = 0, i = NSPF(&sblock); i > 1; i >>= 1) 226 sblock.fs_fsbtodb++; 227 sblock.fs_sblkno = 228 roundup(howmany(bbsize + sbsize, sblock.fs_fsize), sblock.fs_frag); 229 sblock.fs_cblkno = (daddr_t)(sblock.fs_sblkno + 230 roundup(howmany(sbsize, sblock.fs_fsize), sblock.fs_frag)); 231 sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag; 232 sblock.fs_cgoffset = roundup( 233 howmany(sblock.fs_nsect, NSPF(&sblock)), sblock.fs_frag); 234 for (sblock.fs_cgmask = 0xffffffff, i = sblock.fs_ntrak; i > 1; i >>= 1) 235 sblock.fs_cgmask <<= 1; 236 if (!POWEROF2(sblock.fs_ntrak)) 237 sblock.fs_cgmask <<= 1; 238 /* 239 * Validate specified/determined secpercyl 240 * and calculate minimum cylinders per group. 241 */ 242 sblock.fs_spc = secpercyl; 243 for (sblock.fs_cpc = NSPB(&sblock), i = sblock.fs_spc; 244 sblock.fs_cpc > 1 && (i & 1) == 0; 245 sblock.fs_cpc >>= 1, i >>= 1) 246 /* void */; 247 mincpc = sblock.fs_cpc; 248 bpcg = sblock.fs_spc * sectorsize; 249 inospercg = roundup(bpcg / sizeof(struct dinode), INOPB(&sblock)); 250 if (inospercg > MAXIPG(&sblock)) 251 inospercg = MAXIPG(&sblock); 252 used = (sblock.fs_iblkno + inospercg / INOPF(&sblock)) * NSPF(&sblock); 253 mincpgcnt = howmany(sblock.fs_cgoffset * (~sblock.fs_cgmask) + used, 254 sblock.fs_spc); 255 mincpg = roundup(mincpgcnt, mincpc); 256 /* 257 * Insure that cylinder group with mincpg has enough space 258 * for block maps 259 */ 260 sblock.fs_cpg = mincpg; 261 sblock.fs_ipg = inospercg; 262 mapcramped = 0; 263 while (CGSIZE(&sblock) > sblock.fs_bsize) { 264 mapcramped = 1; 265 if (sblock.fs_bsize < MAXBSIZE) { 266 sblock.fs_bsize <<= 1; 267 if ((i & 1) == 0) { 268 i >>= 1; 269 } else { 270 sblock.fs_cpc <<= 1; 271 mincpc <<= 1; 272 mincpg = roundup(mincpgcnt, mincpc); 273 sblock.fs_cpg = mincpg; 274 } 275 sblock.fs_frag <<= 1; 276 sblock.fs_fragshift += 1; 277 if (sblock.fs_frag <= MAXFRAG) 278 continue; 279 } 280 if (sblock.fs_fsize == sblock.fs_bsize) { 281 printf("There is no block size that"); 282 printf(" can support this disk\n"); 283 exit(22); 284 } 285 sblock.fs_frag >>= 1; 286 sblock.fs_fragshift -= 1; 287 sblock.fs_fsize <<= 1; 288 sblock.fs_nspf <<= 1; 289 } 290 /* 291 * Insure that cylinder group with mincpg has enough space for inodes 292 */ 293 inodecramped = 0; 294 used *= sectorsize; 295 inospercg = roundup((mincpg * bpcg - used) / density, INOPB(&sblock)); 296 sblock.fs_ipg = inospercg; 297 while (inospercg > MAXIPG(&sblock)) { 298 inodecramped = 1; 299 if (mincpc == 1 || sblock.fs_frag == 1 || 300 sblock.fs_bsize == MINBSIZE) 301 break; 302 printf("With a block size of %d %s %d\n", sblock.fs_bsize, 303 "minimum bytes per inode is", 304 (mincpg * bpcg - used) / MAXIPG(&sblock) + 1); 305 sblock.fs_bsize >>= 1; 306 sblock.fs_frag >>= 1; 307 sblock.fs_fragshift -= 1; 308 mincpc >>= 1; 309 sblock.fs_cpg = roundup(mincpgcnt, mincpc); 310 if (CGSIZE(&sblock) > sblock.fs_bsize) { 311 sblock.fs_bsize <<= 1; 312 break; 313 } 314 mincpg = sblock.fs_cpg; 315 inospercg = 316 roundup((mincpg * bpcg - used) / density, INOPB(&sblock)); 317 sblock.fs_ipg = inospercg; 318 } 319 if (inodecramped) { 320 if (inospercg > MAXIPG(&sblock)) { 321 printf("Minimum bytes per inode is %d\n", 322 (mincpg * bpcg - used) / MAXIPG(&sblock) + 1); 323 } else if (!mapcramped) { 324 printf("With %d bytes per inode, ", density); 325 printf("minimum cylinders per group is %d\n", mincpg); 326 } 327 } 328 if (mapcramped) { 329 printf("With %d sectors per cylinder, ", sblock.fs_spc); 330 printf("minimum cylinders per group is %d\n", mincpg); 331 } 332 if (inodecramped || mapcramped) { 333 if (sblock.fs_bsize != bsize) 334 printf("%s to be changed from %d to %d\n", 335 "This requires the block size", 336 bsize, sblock.fs_bsize); 337 if (sblock.fs_fsize != fsize) 338 printf("\t%s to be changed from %d to %d\n", 339 "and the fragment size", 340 fsize, sblock.fs_fsize); 341 exit(23); 342 } 343 /* 344 * Calculate the number of cylinders per group 345 */ 346 sblock.fs_cpg = cpg; 347 if (sblock.fs_cpg % mincpc != 0) { 348 printf("%s groups must have a multiple of %d cylinders\n", 349 cpgflg ? "Cylinder" : "Warning: cylinder", mincpc); 350 sblock.fs_cpg = roundup(sblock.fs_cpg, mincpc); 351 if (!cpgflg) 352 cpg = sblock.fs_cpg; 353 } 354 /* 355 * Must insure there is enough space for inodes 356 */ 357 sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density, 358 INOPB(&sblock)); 359 while (sblock.fs_ipg > MAXIPG(&sblock)) { 360 inodecramped = 1; 361 sblock.fs_cpg -= mincpc; 362 sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density, 363 INOPB(&sblock)); 364 } 365 /* 366 * Must insure there is enough space to hold block map 367 */ 368 while (CGSIZE(&sblock) > sblock.fs_bsize) { 369 mapcramped = 1; 370 sblock.fs_cpg -= mincpc; 371 sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density, 372 INOPB(&sblock)); 373 } 374 sblock.fs_fpg = (sblock.fs_cpg * sblock.fs_spc) / NSPF(&sblock); 375 if ((sblock.fs_cpg * sblock.fs_spc) % NSPB(&sblock) != 0) { 376 printf("panic (fs_cpg * fs_spc) % NSPF != 0"); 377 exit(24); 378 } 379 if (sblock.fs_cpg < mincpg) { 380 printf("cylinder groups must have at least %d cylinders\n", 381 mincpg); 382 exit(25); 383 } else if (sblock.fs_cpg != cpg) { 384 if (!cpgflg) 385 printf("Warning: "); 386 else if (!mapcramped && !inodecramped) 387 exit(26); 388 if (mapcramped && inodecramped) 389 printf("Block size and bytes per inode restrict"); 390 else if (mapcramped) 391 printf("Block size restricts"); 392 else 393 printf("Bytes per inode restrict"); 394 printf(" cylinders per group to %d.\n", sblock.fs_cpg); 395 if (cpgflg) 396 exit(27); 397 } 398 sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock)); 399 /* 400 * Now have size for file system and nsect and ntrak. 401 * Determine number of cylinders and blocks in the file system. 402 */ 403 sblock.fs_size = fssize = dbtofsb(&sblock, fssize); 404 sblock.fs_ncyl = fssize * NSPF(&sblock) / sblock.fs_spc; 405 if (fssize * NSPF(&sblock) > sblock.fs_ncyl * sblock.fs_spc) { 406 sblock.fs_ncyl++; 407 warn = 1; 408 } 409 if (sblock.fs_ncyl < 1) { 410 printf("file systems must have at least one cylinder\n"); 411 exit(28); 412 } 413 /* 414 * Determine feasability/values of rotational layout tables. 415 * 416 * The size of the rotational layout tables is limited by the 417 * size of the superblock, SBSIZE. The amount of space available 418 * for tables is calculated as (SBSIZE - sizeof (struct fs)). 419 * The size of these tables is inversely proportional to the block 420 * size of the file system. The size increases if sectors per track 421 * are not powers of two, because more cylinders must be described 422 * by the tables before the rotational pattern repeats (fs_cpc). 423 */ 424 sblock.fs_interleave = interleave; 425 sblock.fs_trackskew = trackskew; 426 sblock.fs_npsect = nphyssectors; 427 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 428 sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs)); 429 if (sblock.fs_ntrak == 1) { 430 sblock.fs_cpc = 0; 431 goto next; 432 } 433 postblsize = sblock.fs_nrpos * sblock.fs_cpc * sizeof(short); 434 rotblsize = sblock.fs_cpc * sblock.fs_spc / NSPB(&sblock); 435 totalsbsize = sizeof(struct fs) + rotblsize; 436 if (sblock.fs_nrpos == 8 && sblock.fs_cpc <= 16) { 437 /* use old static table space */ 438 sblock.fs_postbloff = (char *)(&sblock.fs_opostbl[0][0]) - 439 (char *)(&sblock.fs_link); 440 sblock.fs_rotbloff = &sblock.fs_space[0] - 441 (u_char *)(&sblock.fs_link); 442 } else { 443 /* use dynamic table space */ 444 sblock.fs_postbloff = &sblock.fs_space[0] - 445 (u_char *)(&sblock.fs_link); 446 sblock.fs_rotbloff = sblock.fs_postbloff + postblsize; 447 totalsbsize += postblsize; 448 } 449 if (totalsbsize > SBSIZE || 450 sblock.fs_nsect > (1 << NBBY) * NSPB(&sblock)) { 451 printf("%s %s %d %s %d.%s", 452 "Warning: insufficient space in super block for\n", 453 "rotational layout tables with nsect", sblock.fs_nsect, 454 "and ntrak", sblock.fs_ntrak, 455 "\nFile system performance may be impaired.\n"); 456 sblock.fs_cpc = 0; 457 goto next; 458 } 459 sblock.fs_sbsize = fragroundup(&sblock, totalsbsize); 460 /* 461 * calculate the available blocks for each rotational position 462 */ 463 for (cylno = 0; cylno < sblock.fs_cpc; cylno++) 464 for (rpos = 0; rpos < sblock.fs_nrpos; rpos++) 465 fs_postbl(&sblock, cylno)[rpos] = -1; 466 for (i = (rotblsize - 1) * sblock.fs_frag; 467 i >= 0; i -= sblock.fs_frag) { 468 cylno = cbtocylno(&sblock, i); 469 rpos = cbtorpos(&sblock, i); 470 blk = fragstoblks(&sblock, i); 471 if (fs_postbl(&sblock, cylno)[rpos] == -1) 472 fs_rotbl(&sblock)[blk] = 0; 473 else 474 fs_rotbl(&sblock)[blk] = 475 fs_postbl(&sblock, cylno)[rpos] - blk; 476 fs_postbl(&sblock, cylno)[rpos] = blk; 477 } 478 next: 479 /* 480 * Compute/validate number of cylinder groups. 481 */ 482 sblock.fs_ncg = sblock.fs_ncyl / sblock.fs_cpg; 483 if (sblock.fs_ncyl % sblock.fs_cpg) 484 sblock.fs_ncg++; 485 sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock); 486 i = MIN(~sblock.fs_cgmask, sblock.fs_ncg - 1); 487 if (cgdmin(&sblock, i) - cgbase(&sblock, i) >= sblock.fs_fpg) { 488 printf("inode blocks/cyl group (%d) >= data blocks (%d)\n", 489 cgdmin(&sblock, i) - cgbase(&sblock, i) / sblock.fs_frag, 490 sblock.fs_fpg / sblock.fs_frag); 491 printf("number of cylinders per cylinder group (%d) %s.\n", 492 sblock.fs_cpg, "must be increased"); 493 exit(29); 494 } 495 j = sblock.fs_ncg - 1; 496 if ((i = fssize - j * sblock.fs_fpg) < sblock.fs_fpg && 497 cgdmin(&sblock, j) - cgbase(&sblock, j) > i) { 498 if (j == 0) { 499 printf("Filesystem must have at least %d sectors\n", 500 NSPF(&sblock) * 501 (cgdmin(&sblock, 0) + 3 * sblock.fs_frag)); 502 exit(30); 503 } 504 printf("Warning: inode blocks/cyl group (%d) >= data blocks (%d) in last\n", 505 (cgdmin(&sblock, j) - cgbase(&sblock, j)) / sblock.fs_frag, 506 i / sblock.fs_frag); 507 printf(" cylinder group. This implies %d sector(s) cannot be allocated.\n", 508 i * NSPF(&sblock)); 509 sblock.fs_ncg--; 510 sblock.fs_ncyl -= sblock.fs_ncyl % sblock.fs_cpg; 511 sblock.fs_size = fssize = sblock.fs_ncyl * sblock.fs_spc / 512 NSPF(&sblock); 513 warn = 0; 514 } 515 if (warn && !mfs) { 516 printf("Warning: %d sector(s) in last cylinder unallocated\n", 517 sblock.fs_spc - 518 (fssize * NSPF(&sblock) - (sblock.fs_ncyl - 1) 519 * sblock.fs_spc)); 520 } 521 /* 522 * fill in remaining fields of the super block 523 */ 524 sblock.fs_csaddr = cgdmin(&sblock, 0); 525 sblock.fs_cssize = 526 fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum)); 527 i = sblock.fs_bsize / sizeof(struct csum); 528 sblock.fs_csmask = ~(i - 1); 529 for (sblock.fs_csshift = 0; i > 1; i >>= 1) 530 sblock.fs_csshift++; 531 fscs = (struct csum *)calloc(1, sblock.fs_cssize); 532 sblock.fs_magic = FS_MAGIC; 533 sblock.fs_rotdelay = rotdelay; 534 sblock.fs_minfree = minfree; 535 sblock.fs_maxcontig = maxcontig; 536 sblock.fs_headswitch = headswitch; 537 sblock.fs_trkseek = trackseek; 538 sblock.fs_maxbpg = maxbpg; 539 sblock.fs_rps = rpm / 60; 540 sblock.fs_optim = opt; 541 sblock.fs_cgrotor = 0; 542 sblock.fs_cstotal.cs_ndir = 0; 543 sblock.fs_cstotal.cs_nbfree = 0; 544 sblock.fs_cstotal.cs_nifree = 0; 545 sblock.fs_cstotal.cs_nffree = 0; 546 sblock.fs_fmod = 0; 547 sblock.fs_ronly = 0; 548 /* 549 * Dump out summary information about file system. 550 */ 551 if (!mfs) { 552 printf("%s:\t%d sectors in %d %s of %d tracks, %d sectors\n", 553 fsys, sblock.fs_size * NSPF(&sblock), sblock.fs_ncyl, 554 "cylinders", sblock.fs_ntrak, sblock.fs_nsect); 555 printf("\t%.1fMB in %d cyl groups (%d c/g, %.2fMB/g, %d i/g)\n", 556 (float)sblock.fs_size * sblock.fs_fsize * 1e-6, 557 sblock.fs_ncg, sblock.fs_cpg, 558 (float)sblock.fs_fpg * sblock.fs_fsize * 1e-6, 559 sblock.fs_ipg); 560 } 561 /* 562 * Now build the cylinders group blocks and 563 * then print out indices of cylinder groups. 564 */ 565 if (!mfs) 566 printf("super-block backups (for fsck -b #) at:"); 567 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) { 568 initcg(cylno); 569 if (mfs) 570 continue; 571 if (cylno % 9 == 0) 572 printf("\n"); 573 printf(" %d,", fsbtodb(&sblock, cgsblock(&sblock, cylno))); 574 } 575 if (!mfs) 576 printf("\n"); 577 if (Nflag && !mfs) 578 exit(0); 579 /* 580 * Now construct the initial file system, 581 * then write out the super-block. 582 */ 583 fsinit(); 584 sblock.fs_time = utime; 585 wtfs(SBOFF / sectorsize, sbsize, (char *)&sblock); 586 for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize) 587 wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)), 588 sblock.fs_cssize - i < sblock.fs_bsize ? 589 sblock.fs_cssize - i : sblock.fs_bsize, 590 ((char *)fscs) + i); 591 /* 592 * Write out the duplicate super blocks 593 */ 594 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 595 wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)), 596 sbsize, (char *)&sblock); 597 /* 598 * Update information about this partion in pack 599 * label, to that it may be updated on disk. 600 */ 601 pp->p_fstype = FS_BSDFFS; 602 pp->p_fsize = sblock.fs_fsize; 603 pp->p_frag = sblock.fs_frag; 604 pp->p_cpg = sblock.fs_cpg; 605 /* 606 * Notify parent process of success. 607 */ 608 if (mfs) 609 kill(ppid, SIGUSR1); 610 } 611 612 /* 613 * Initialize a cylinder group. 614 */ 615 initcg(cylno) 616 int cylno; 617 { 618 daddr_t cbase, d, dlower, dupper, dmax; 619 long i, j, s; 620 register struct csum *cs; 621 622 /* 623 * Determine block bounds for cylinder group. 624 * Allow space for super block summary information in first 625 * cylinder group. 626 */ 627 cbase = cgbase(&sblock, cylno); 628 dmax = cbase + sblock.fs_fpg; 629 if (dmax > sblock.fs_size) 630 dmax = sblock.fs_size; 631 dlower = cgsblock(&sblock, cylno) - cbase; 632 dupper = cgdmin(&sblock, cylno) - cbase; 633 if (cylno == 0) 634 dupper += howmany(sblock.fs_cssize, sblock.fs_fsize); 635 cs = fscs + cylno; 636 acg.cg_time = utime; 637 acg.cg_magic = CG_MAGIC; 638 acg.cg_cgx = cylno; 639 if (cylno == sblock.fs_ncg - 1) 640 acg.cg_ncyl = sblock.fs_ncyl % sblock.fs_cpg; 641 else 642 acg.cg_ncyl = sblock.fs_cpg; 643 acg.cg_niblk = sblock.fs_ipg; 644 acg.cg_ndblk = dmax - cbase; 645 acg.cg_cs.cs_ndir = 0; 646 acg.cg_cs.cs_nffree = 0; 647 acg.cg_cs.cs_nbfree = 0; 648 acg.cg_cs.cs_nifree = 0; 649 acg.cg_rotor = 0; 650 acg.cg_frotor = 0; 651 acg.cg_irotor = 0; 652 acg.cg_btotoff = &acg.cg_space[0] - (u_char *)(&acg.cg_link); 653 acg.cg_boff = acg.cg_btotoff + sblock.fs_cpg * sizeof(long); 654 acg.cg_iusedoff = acg.cg_boff + 655 sblock.fs_cpg * sblock.fs_nrpos * sizeof(short); 656 acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, NBBY); 657 acg.cg_nextfreeoff = acg.cg_freeoff + 658 howmany(sblock.fs_cpg * sblock.fs_spc / NSPF(&sblock), NBBY); 659 for (i = 0; i < sblock.fs_frag; i++) { 660 acg.cg_frsum[i] = 0; 661 } 662 bzero((caddr_t)cg_inosused(&acg), acg.cg_freeoff - acg.cg_iusedoff); 663 acg.cg_cs.cs_nifree += sblock.fs_ipg; 664 if (cylno == 0) 665 for (i = 0; i < ROOTINO; i++) { 666 setbit(cg_inosused(&acg), i); 667 acg.cg_cs.cs_nifree--; 668 } 669 for (i = 0; i < sblock.fs_ipg / INOPF(&sblock); i += sblock.fs_frag) 670 wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i), 671 sblock.fs_bsize, (char *)zino); 672 bzero((caddr_t)cg_blktot(&acg), acg.cg_boff - acg.cg_btotoff); 673 bzero((caddr_t)cg_blks(&sblock, &acg, 0), 674 acg.cg_iusedoff - acg.cg_boff); 675 bzero((caddr_t)cg_blksfree(&acg), acg.cg_nextfreeoff - acg.cg_freeoff); 676 if (cylno > 0) { 677 /* 678 * In cylno 0, beginning space is reserved 679 * for boot and super blocks. 680 */ 681 for (d = 0; d < dlower; d += sblock.fs_frag) { 682 setblock(&sblock, cg_blksfree(&acg), d/sblock.fs_frag); 683 acg.cg_cs.cs_nbfree++; 684 cg_blktot(&acg)[cbtocylno(&sblock, d)]++; 685 cg_blks(&sblock, &acg, cbtocylno(&sblock, d)) 686 [cbtorpos(&sblock, d)]++; 687 } 688 sblock.fs_dsize += dlower; 689 } 690 sblock.fs_dsize += acg.cg_ndblk - dupper; 691 if (i = dupper % sblock.fs_frag) { 692 acg.cg_frsum[sblock.fs_frag - i]++; 693 for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) { 694 setbit(cg_blksfree(&acg), dupper); 695 acg.cg_cs.cs_nffree++; 696 } 697 } 698 for (d = dupper; d + sblock.fs_frag <= dmax - cbase; ) { 699 setblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag); 700 acg.cg_cs.cs_nbfree++; 701 cg_blktot(&acg)[cbtocylno(&sblock, d)]++; 702 cg_blks(&sblock, &acg, cbtocylno(&sblock, d)) 703 [cbtorpos(&sblock, d)]++; 704 d += sblock.fs_frag; 705 } 706 if (d < dmax - cbase) { 707 acg.cg_frsum[dmax - cbase - d]++; 708 for (; d < dmax - cbase; d++) { 709 setbit(cg_blksfree(&acg), d); 710 acg.cg_cs.cs_nffree++; 711 } 712 } 713 sblock.fs_cstotal.cs_ndir += acg.cg_cs.cs_ndir; 714 sblock.fs_cstotal.cs_nffree += acg.cg_cs.cs_nffree; 715 sblock.fs_cstotal.cs_nbfree += acg.cg_cs.cs_nbfree; 716 sblock.fs_cstotal.cs_nifree += acg.cg_cs.cs_nifree; 717 *cs = acg.cg_cs; 718 wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)), 719 sblock.fs_bsize, (char *)&acg); 720 } 721 722 /* 723 * initialize the file system 724 */ 725 struct dinode node; 726 727 #ifdef LOSTDIR 728 #define PREDEFDIR 3 729 #else 730 #define PREDEFDIR 2 731 #endif 732 733 struct direct root_dir[] = { 734 { ROOTINO, sizeof(struct direct), 1, "." }, 735 { ROOTINO, sizeof(struct direct), 2, ".." }, 736 #ifdef LOSTDIR 737 { LOSTFOUNDINO, sizeof(struct direct), 10, "lost+found" }, 738 #endif 739 }; 740 #ifdef LOSTDIR 741 struct direct lost_found_dir[] = { 742 { LOSTFOUNDINO, sizeof(struct direct), 1, "." }, 743 { ROOTINO, sizeof(struct direct), 2, ".." }, 744 { 0, DIRBLKSIZ, 0, 0 }, 745 }; 746 #endif 747 char buf[MAXBSIZE]; 748 749 fsinit() 750 { 751 int i; 752 753 /* 754 * initialize the node 755 */ 756 node.di_atime = utime; 757 node.di_mtime = utime; 758 node.di_ctime = utime; 759 #ifdef LOSTDIR 760 /* 761 * create the lost+found directory 762 */ 763 (void)makedir(lost_found_dir, 2); 764 for (i = DIRBLKSIZ; i < sblock.fs_bsize; i += DIRBLKSIZ) 765 bcopy(&lost_found_dir[2], &buf[i], DIRSIZ(&lost_found_dir[2])); 766 node.di_mode = IFDIR | UMASK; 767 node.di_nlink = 2; 768 node.di_size = sblock.fs_bsize; 769 node.di_db[0] = alloc(node.di_size, node.di_mode); 770 node.di_blocks = btodb(fragroundup(&sblock, node.di_size)); 771 wtfs(fsbtodb(&sblock, node.di_db[0]), node.di_size, buf); 772 iput(&node, LOSTFOUNDINO); 773 #endif 774 /* 775 * create the root directory 776 */ 777 if (mfs) 778 node.di_mode = IFDIR | 01777; 779 else 780 node.di_mode = IFDIR | UMASK; 781 node.di_nlink = PREDEFDIR; 782 node.di_size = makedir(root_dir, PREDEFDIR); 783 node.di_db[0] = alloc(sblock.fs_fsize, node.di_mode); 784 node.di_blocks = btodb(fragroundup(&sblock, node.di_size)); 785 wtfs(fsbtodb(&sblock, node.di_db[0]), sblock.fs_fsize, buf); 786 iput(&node, ROOTINO); 787 } 788 789 /* 790 * construct a set of directory entries in "buf". 791 * return size of directory. 792 */ 793 makedir(protodir, entries) 794 register struct direct *protodir; 795 int entries; 796 { 797 char *cp; 798 int i, spcleft; 799 800 spcleft = DIRBLKSIZ; 801 for (cp = buf, i = 0; i < entries - 1; i++) { 802 protodir[i].d_reclen = DIRSIZ(&protodir[i]); 803 bcopy(&protodir[i], cp, protodir[i].d_reclen); 804 cp += protodir[i].d_reclen; 805 spcleft -= protodir[i].d_reclen; 806 } 807 protodir[i].d_reclen = spcleft; 808 bcopy(&protodir[i], cp, DIRSIZ(&protodir[i])); 809 return (DIRBLKSIZ); 810 } 811 812 /* 813 * allocate a block or frag 814 */ 815 daddr_t 816 alloc(size, mode) 817 int size; 818 int mode; 819 { 820 int i, frag; 821 daddr_t d; 822 823 rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, 824 (char *)&acg); 825 if (acg.cg_magic != CG_MAGIC) { 826 printf("cg 0: bad magic number\n"); 827 return (0); 828 } 829 if (acg.cg_cs.cs_nbfree == 0) { 830 printf("first cylinder group ran out of space\n"); 831 return (0); 832 } 833 for (d = 0; d < acg.cg_ndblk; d += sblock.fs_frag) 834 if (isblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag)) 835 goto goth; 836 printf("internal error: can't find block in cyl 0\n"); 837 return (0); 838 goth: 839 clrblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag); 840 acg.cg_cs.cs_nbfree--; 841 sblock.fs_cstotal.cs_nbfree--; 842 fscs[0].cs_nbfree--; 843 if (mode & IFDIR) { 844 acg.cg_cs.cs_ndir++; 845 sblock.fs_cstotal.cs_ndir++; 846 fscs[0].cs_ndir++; 847 } 848 cg_blktot(&acg)[cbtocylno(&sblock, d)]--; 849 cg_blks(&sblock, &acg, cbtocylno(&sblock, d))[cbtorpos(&sblock, d)]--; 850 if (size != sblock.fs_bsize) { 851 frag = howmany(size, sblock.fs_fsize); 852 fscs[0].cs_nffree += sblock.fs_frag - frag; 853 sblock.fs_cstotal.cs_nffree += sblock.fs_frag - frag; 854 acg.cg_cs.cs_nffree += sblock.fs_frag - frag; 855 acg.cg_frsum[sblock.fs_frag - frag]++; 856 for (i = frag; i < sblock.fs_frag; i++) 857 setbit(cg_blksfree(&acg), d + i); 858 } 859 wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, 860 (char *)&acg); 861 return (d); 862 } 863 864 /* 865 * Allocate an inode on the disk 866 */ 867 iput(ip, ino) 868 register struct dinode *ip; 869 register ino_t ino; 870 { 871 struct dinode buf[MAXINOPB]; 872 daddr_t d; 873 int c; 874 875 c = itog(&sblock, ino); 876 rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, 877 (char *)&acg); 878 if (acg.cg_magic != CG_MAGIC) { 879 printf("cg 0: bad magic number\n"); 880 exit(31); 881 } 882 acg.cg_cs.cs_nifree--; 883 setbit(cg_inosused(&acg), ino); 884 wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, 885 (char *)&acg); 886 sblock.fs_cstotal.cs_nifree--; 887 fscs[0].cs_nifree--; 888 if (ino >= sblock.fs_ipg * sblock.fs_ncg) { 889 printf("fsinit: inode value out of range (%d).\n", ino); 890 exit(32); 891 } 892 d = fsbtodb(&sblock, itod(&sblock, ino)); 893 rdfs(d, sblock.fs_bsize, buf); 894 buf[itoo(&sblock, ino)] = *ip; 895 wtfs(d, sblock.fs_bsize, buf); 896 } 897 898 /* 899 * Notify parent process that the filesystem has created itself successfully. 900 */ 901 started() 902 { 903 904 exit(0); 905 } 906 907 /* 908 * Replace libc function with one suited to our needs. 909 */ 910 caddr_t 911 malloc(size) 912 register u_long size; 913 { 914 u_long base, i; 915 static u_long pgsz; 916 struct rlimit rlp; 917 918 if (pgsz == 0) { 919 base = sbrk(0); 920 pgsz = getpagesize() - 1; 921 i = (base + pgsz) &~ pgsz; 922 base = sbrk(i - base); 923 if (getrlimit(RLIMIT_DATA, &rlp) < 0) 924 perror("getrlimit"); 925 rlp.rlim_cur = rlp.rlim_max; 926 if (setrlimit(RLIMIT_DATA, &rlp) < 0) 927 perror("setrlimit"); 928 memleft = rlp.rlim_max - base; 929 } 930 size = (size + pgsz) &~ pgsz; 931 if (size > memleft) 932 size = memleft; 933 memleft -= size; 934 if (size == 0) 935 return (0); 936 return ((caddr_t)sbrk(size)); 937 } 938 939 /* 940 * Replace libc function with one suited to our needs. 941 */ 942 caddr_t 943 realloc(ptr, size) 944 char *ptr; 945 u_long size; 946 { 947 948 /* always fail for now */ 949 return ((caddr_t)0); 950 } 951 952 /* 953 * Replace libc function with one suited to our needs. 954 */ 955 char * 956 calloc(size, numelm) 957 u_long size, numelm; 958 { 959 caddr_t base; 960 961 size *= numelm; 962 base = malloc(size); 963 bzero(base, size); 964 return (base); 965 } 966 967 /* 968 * Replace libc function with one suited to our needs. 969 */ 970 free(ptr) 971 char *ptr; 972 { 973 974 /* do not worry about it for now */ 975 } 976 977 /* 978 * read a block from the file system 979 */ 980 rdfs(bno, size, bf) 981 daddr_t bno; 982 int size; 983 char *bf; 984 { 985 int n; 986 987 if (mfs) { 988 bcopy(membase + bno * sectorsize, bf, size); 989 return; 990 } 991 if (lseek(fsi, bno * sectorsize, 0) < 0) { 992 printf("seek error: %ld\n", bno); 993 perror("rdfs"); 994 exit(33); 995 } 996 n = read(fsi, bf, size); 997 if(n != size) { 998 printf("read error: %ld\n", bno); 999 perror("rdfs"); 1000 exit(34); 1001 } 1002 } 1003 1004 /* 1005 * write a block to the file system 1006 */ 1007 wtfs(bno, size, bf) 1008 daddr_t bno; 1009 int size; 1010 char *bf; 1011 { 1012 int n; 1013 1014 if (mfs) { 1015 bcopy(bf, membase + bno * sectorsize, size); 1016 return; 1017 } 1018 if (Nflag) 1019 return; 1020 if (lseek(fso, bno * sectorsize, 0) < 0) { 1021 printf("seek error: %ld\n", bno); 1022 perror("wtfs"); 1023 exit(35); 1024 } 1025 n = write(fso, bf, size); 1026 if(n != size) { 1027 printf("write error: %ld\n", bno); 1028 perror("wtfs"); 1029 exit(36); 1030 } 1031 } 1032 1033 /* 1034 * check if a block is available 1035 */ 1036 isblock(fs, cp, h) 1037 struct fs *fs; 1038 unsigned char *cp; 1039 int h; 1040 { 1041 unsigned char mask; 1042 1043 switch (fs->fs_frag) { 1044 case 8: 1045 return (cp[h] == 0xff); 1046 case 4: 1047 mask = 0x0f << ((h & 0x1) << 2); 1048 return ((cp[h >> 1] & mask) == mask); 1049 case 2: 1050 mask = 0x03 << ((h & 0x3) << 1); 1051 return ((cp[h >> 2] & mask) == mask); 1052 case 1: 1053 mask = 0x01 << (h & 0x7); 1054 return ((cp[h >> 3] & mask) == mask); 1055 default: 1056 #ifdef STANDALONE 1057 printf("isblock bad fs_frag %d\n", fs->fs_frag); 1058 #else 1059 fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag); 1060 #endif 1061 return (0); 1062 } 1063 } 1064 1065 /* 1066 * take a block out of the map 1067 */ 1068 clrblock(fs, cp, h) 1069 struct fs *fs; 1070 unsigned char *cp; 1071 int h; 1072 { 1073 switch ((fs)->fs_frag) { 1074 case 8: 1075 cp[h] = 0; 1076 return; 1077 case 4: 1078 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2)); 1079 return; 1080 case 2: 1081 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1)); 1082 return; 1083 case 1: 1084 cp[h >> 3] &= ~(0x01 << (h & 0x7)); 1085 return; 1086 default: 1087 #ifdef STANDALONE 1088 printf("clrblock bad fs_frag %d\n", fs->fs_frag); 1089 #else 1090 fprintf(stderr, "clrblock bad fs_frag %d\n", fs->fs_frag); 1091 #endif 1092 return; 1093 } 1094 } 1095 1096 /* 1097 * put a block into the map 1098 */ 1099 setblock(fs, cp, h) 1100 struct fs *fs; 1101 unsigned char *cp; 1102 int h; 1103 { 1104 switch (fs->fs_frag) { 1105 case 8: 1106 cp[h] = 0xff; 1107 return; 1108 case 4: 1109 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2)); 1110 return; 1111 case 2: 1112 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1)); 1113 return; 1114 case 1: 1115 cp[h >> 3] |= (0x01 << (h & 0x7)); 1116 return; 1117 default: 1118 #ifdef STANDALONE 1119 printf("setblock bad fs_frag %d\n", fs->fs_frag); 1120 #else 1121 fprintf(stderr, "setblock bad fs_frag %d\n", fs->fs_frag); 1122 #endif 1123 return; 1124 } 1125 } 1126