1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project by Marshall 8 * Kirk McKusick and Network Associates Laboratories, the Security 9 * Research Division of Network Associates, Inc. under DARPA/SPAWAR 10 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS 11 * research program. 12 * 13 * Copyright (c) 1980, 1989, 1993 14 * The Regents of the University of California. All rights reserved. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41 #if 0 42 #ifndef lint 43 static char sccsid[] = "@(#)mkfs.c 8.11 (Berkeley) 5/3/95"; 44 #endif /* not lint */ 45 #endif 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #define IN_RTLD /* So we pickup the P_OSREL defines */ 50 #include <sys/param.h> 51 #include <sys/disklabel.h> 52 #include <sys/file.h> 53 #include <sys/ioctl.h> 54 #include <sys/mman.h> 55 #include <sys/resource.h> 56 #include <sys/stat.h> 57 #include <sys/wait.h> 58 #include <err.h> 59 #include <grp.h> 60 #include <limits.h> 61 #include <signal.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <stdint.h> 65 #include <stdio.h> 66 #include <time.h> 67 #include <unistd.h> 68 #include <ufs/ufs/dinode.h> 69 #include <ufs/ufs/dir.h> 70 #include <ufs/ffs/fs.h> 71 #include "newfs.h" 72 73 /* 74 * make file system for cylinder-group style file systems 75 */ 76 #define UMASK 0755 77 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 78 79 static struct csum *fscs; 80 #define sblock disk.d_fs 81 #define acg disk.d_cg 82 83 union dinode { 84 struct ufs1_dinode dp1; 85 struct ufs2_dinode dp2; 86 }; 87 #define DIP(dp, field) \ 88 ((sblock.fs_magic == FS_UFS1_MAGIC) ? \ 89 (dp)->dp1.field : (dp)->dp2.field) 90 91 static caddr_t iobuf; 92 static long iobufsize; 93 static ufs2_daddr_t alloc(int size, int mode); 94 static int charsperline(void); 95 static void clrblock(struct fs *, unsigned char *, int); 96 static void fsinit(time_t); 97 static int ilog2(int); 98 static void initcg(int, time_t); 99 static int isblock(struct fs *, unsigned char *, int); 100 static void iput(union dinode *, ino_t); 101 static int makedir(struct direct *, int); 102 static void setblock(struct fs *, unsigned char *, int); 103 static void wtfs(ufs2_daddr_t, int, char *); 104 static u_int32_t newfs_random(void); 105 106 void 107 mkfs(struct partition *pp, char *fsys) 108 { 109 int fragsperinode, optimalfpg, origdensity, minfpg, lastminfpg; 110 long i, j, csfrags; 111 uint cg; 112 time_t utime; 113 quad_t sizepb; 114 int width; 115 ino_t maxinum; 116 int minfragsperinode; /* minimum ratio of frags to inodes */ 117 char tmpbuf[100]; /* XXX this will break in about 2,500 years */ 118 struct fsrecovery *fsr; 119 char *fsrbuf; 120 union { 121 struct fs fdummy; 122 char cdummy[SBLOCKSIZE]; 123 } dummy; 124 #define fsdummy dummy.fdummy 125 #define chdummy dummy.cdummy 126 127 /* 128 * Our blocks == sector size, and the version of UFS we are using is 129 * specified by Oflag. 130 */ 131 disk.d_bsize = sectorsize; 132 disk.d_ufs = Oflag; 133 if (Rflag) 134 utime = 1000000000; 135 else 136 time(&utime); 137 sblock.fs_old_flags = FS_FLAGS_UPDATED; 138 sblock.fs_flags = 0; 139 if (Uflag) 140 sblock.fs_flags |= FS_DOSOFTDEP; 141 if (Lflag) 142 strlcpy(sblock.fs_volname, volumelabel, MAXVOLLEN); 143 if (Jflag) 144 sblock.fs_flags |= FS_GJOURNAL; 145 if (lflag) 146 sblock.fs_flags |= FS_MULTILABEL; 147 if (tflag) 148 sblock.fs_flags |= FS_TRIM; 149 /* 150 * Validate the given file system size. 151 * Verify that its last block can actually be accessed. 152 * Convert to file system fragment sized units. 153 */ 154 if (fssize <= 0) { 155 printf("preposterous size %jd\n", (intmax_t)fssize); 156 exit(13); 157 } 158 wtfs(fssize - (realsectorsize / DEV_BSIZE), realsectorsize, 159 (char *)&sblock); 160 /* 161 * collect and verify the file system density info 162 */ 163 sblock.fs_avgfilesize = avgfilesize; 164 sblock.fs_avgfpdir = avgfilesperdir; 165 if (sblock.fs_avgfilesize <= 0) 166 printf("illegal expected average file size %d\n", 167 sblock.fs_avgfilesize), exit(14); 168 if (sblock.fs_avgfpdir <= 0) 169 printf("illegal expected number of files per directory %d\n", 170 sblock.fs_avgfpdir), exit(15); 171 172 restart: 173 /* 174 * collect and verify the block and fragment sizes 175 */ 176 sblock.fs_bsize = bsize; 177 sblock.fs_fsize = fsize; 178 if (!POWEROF2(sblock.fs_bsize)) { 179 printf("block size must be a power of 2, not %d\n", 180 sblock.fs_bsize); 181 exit(16); 182 } 183 if (!POWEROF2(sblock.fs_fsize)) { 184 printf("fragment size must be a power of 2, not %d\n", 185 sblock.fs_fsize); 186 exit(17); 187 } 188 if (sblock.fs_fsize < sectorsize) { 189 printf("increasing fragment size from %d to sector size (%d)\n", 190 sblock.fs_fsize, sectorsize); 191 sblock.fs_fsize = sectorsize; 192 } 193 if (sblock.fs_bsize > MAXBSIZE) { 194 printf("decreasing block size from %d to maximum (%d)\n", 195 sblock.fs_bsize, MAXBSIZE); 196 sblock.fs_bsize = MAXBSIZE; 197 } 198 if (sblock.fs_bsize < MINBSIZE) { 199 printf("increasing block size from %d to minimum (%d)\n", 200 sblock.fs_bsize, MINBSIZE); 201 sblock.fs_bsize = MINBSIZE; 202 } 203 if (sblock.fs_fsize > MAXBSIZE) { 204 printf("decreasing fragment size from %d to maximum (%d)\n", 205 sblock.fs_fsize, MAXBSIZE); 206 sblock.fs_fsize = MAXBSIZE; 207 } 208 if (sblock.fs_bsize < sblock.fs_fsize) { 209 printf("increasing block size from %d to fragment size (%d)\n", 210 sblock.fs_bsize, sblock.fs_fsize); 211 sblock.fs_bsize = sblock.fs_fsize; 212 } 213 if (sblock.fs_fsize * MAXFRAG < sblock.fs_bsize) { 214 printf( 215 "increasing fragment size from %d to block size / %d (%d)\n", 216 sblock.fs_fsize, MAXFRAG, sblock.fs_bsize / MAXFRAG); 217 sblock.fs_fsize = sblock.fs_bsize / MAXFRAG; 218 } 219 if (maxbsize == 0) 220 maxbsize = bsize; 221 if (maxbsize < bsize || !POWEROF2(maxbsize)) { 222 sblock.fs_maxbsize = sblock.fs_bsize; 223 printf("Extent size set to %d\n", sblock.fs_maxbsize); 224 } else if (sblock.fs_maxbsize > FS_MAXCONTIG * sblock.fs_bsize) { 225 sblock.fs_maxbsize = FS_MAXCONTIG * sblock.fs_bsize; 226 printf("Extent size reduced to %d\n", sblock.fs_maxbsize); 227 } else { 228 sblock.fs_maxbsize = maxbsize; 229 } 230 /* 231 * Maxcontig sets the default for the maximum number of blocks 232 * that may be allocated sequentially. With file system clustering 233 * it is possible to allocate contiguous blocks up to the maximum 234 * transfer size permitted by the controller or buffering. 235 */ 236 if (maxcontig == 0) 237 maxcontig = MAX(1, MAXPHYS / bsize); 238 sblock.fs_maxcontig = maxcontig; 239 if (sblock.fs_maxcontig < sblock.fs_maxbsize / sblock.fs_bsize) { 240 sblock.fs_maxcontig = sblock.fs_maxbsize / sblock.fs_bsize; 241 printf("Maxcontig raised to %d\n", sblock.fs_maxbsize); 242 } 243 if (sblock.fs_maxcontig > 1) 244 sblock.fs_contigsumsize = MIN(sblock.fs_maxcontig,FS_MAXCONTIG); 245 sblock.fs_bmask = ~(sblock.fs_bsize - 1); 246 sblock.fs_fmask = ~(sblock.fs_fsize - 1); 247 sblock.fs_qbmask = ~sblock.fs_bmask; 248 sblock.fs_qfmask = ~sblock.fs_fmask; 249 sblock.fs_bshift = ilog2(sblock.fs_bsize); 250 sblock.fs_fshift = ilog2(sblock.fs_fsize); 251 sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize); 252 sblock.fs_fragshift = ilog2(sblock.fs_frag); 253 if (sblock.fs_frag > MAXFRAG) { 254 printf("fragment size %d is still too small (can't happen)\n", 255 sblock.fs_bsize / MAXFRAG); 256 exit(21); 257 } 258 sblock.fs_fsbtodb = ilog2(sblock.fs_fsize / sectorsize); 259 sblock.fs_size = fssize = dbtofsb(&sblock, fssize); 260 sblock.fs_providersize = dbtofsb(&sblock, mediasize / sectorsize); 261 262 /* 263 * Before the filesystem is finally initialized, mark it 264 * as incompletely initialized. 265 */ 266 sblock.fs_magic = FS_BAD_MAGIC; 267 268 if (Oflag == 1) { 269 sblock.fs_sblockloc = SBLOCK_UFS1; 270 sblock.fs_sblockactualloc = SBLOCK_UFS1; 271 sblock.fs_nindir = sblock.fs_bsize / sizeof(ufs1_daddr_t); 272 sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode); 273 sblock.fs_maxsymlinklen = ((UFS_NDADDR + UFS_NIADDR) * 274 sizeof(ufs1_daddr_t)); 275 sblock.fs_old_inodefmt = FS_44INODEFMT; 276 sblock.fs_old_cgoffset = 0; 277 sblock.fs_old_cgmask = 0xffffffff; 278 sblock.fs_old_size = sblock.fs_size; 279 sblock.fs_old_rotdelay = 0; 280 sblock.fs_old_rps = 60; 281 sblock.fs_old_nspf = sblock.fs_fsize / sectorsize; 282 sblock.fs_old_cpg = 1; 283 sblock.fs_old_interleave = 1; 284 sblock.fs_old_trackskew = 0; 285 sblock.fs_old_cpc = 0; 286 sblock.fs_old_postblformat = 1; 287 sblock.fs_old_nrpos = 1; 288 } else { 289 sblock.fs_sblockloc = SBLOCK_UFS2; 290 sblock.fs_sblockactualloc = SBLOCK_UFS2; 291 sblock.fs_nindir = sblock.fs_bsize / sizeof(ufs2_daddr_t); 292 sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode); 293 sblock.fs_maxsymlinklen = ((UFS_NDADDR + UFS_NIADDR) * 294 sizeof(ufs2_daddr_t)); 295 } 296 sblock.fs_sblkno = 297 roundup(howmany(sblock.fs_sblockloc + SBLOCKSIZE, sblock.fs_fsize), 298 sblock.fs_frag); 299 sblock.fs_cblkno = sblock.fs_sblkno + 300 roundup(howmany(SBLOCKSIZE, sblock.fs_fsize), sblock.fs_frag); 301 sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag; 302 sblock.fs_maxfilesize = sblock.fs_bsize * UFS_NDADDR - 1; 303 for (sizepb = sblock.fs_bsize, i = 0; i < UFS_NIADDR; i++) { 304 sizepb *= NINDIR(&sblock); 305 sblock.fs_maxfilesize += sizepb; 306 } 307 308 /* 309 * It's impossible to create a snapshot in case that fs_maxfilesize 310 * is smaller than the fssize. 311 */ 312 if (sblock.fs_maxfilesize < (u_quad_t)fssize) { 313 warnx("WARNING: You will be unable to create snapshots on this " 314 "file system. Correct by using a larger blocksize."); 315 } 316 317 /* 318 * Calculate the number of blocks to put into each cylinder group. 319 * 320 * This algorithm selects the number of blocks per cylinder 321 * group. The first goal is to have at least enough data blocks 322 * in each cylinder group to meet the density requirement. Once 323 * this goal is achieved we try to expand to have at least 324 * MINCYLGRPS cylinder groups. Once this goal is achieved, we 325 * pack as many blocks into each cylinder group map as will fit. 326 * 327 * We start by calculating the smallest number of blocks that we 328 * can put into each cylinder group. If this is too big, we reduce 329 * the density until it fits. 330 */ 331 maxinum = (((int64_t)(1)) << 32) - INOPB(&sblock); 332 minfragsperinode = 1 + fssize / maxinum; 333 if (density == 0) { 334 density = MAX(NFPI, minfragsperinode) * fsize; 335 } else if (density < minfragsperinode * fsize) { 336 origdensity = density; 337 density = minfragsperinode * fsize; 338 fprintf(stderr, "density increased from %d to %d\n", 339 origdensity, density); 340 } 341 origdensity = density; 342 for (;;) { 343 fragsperinode = MAX(numfrags(&sblock, density), 1); 344 if (fragsperinode < minfragsperinode) { 345 bsize <<= 1; 346 fsize <<= 1; 347 printf("Block size too small for a file system %s %d\n", 348 "of this size. Increasing blocksize to", bsize); 349 goto restart; 350 } 351 minfpg = fragsperinode * INOPB(&sblock); 352 if (minfpg > sblock.fs_size) 353 minfpg = sblock.fs_size; 354 sblock.fs_ipg = INOPB(&sblock); 355 sblock.fs_fpg = roundup(sblock.fs_iblkno + 356 sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag); 357 if (sblock.fs_fpg < minfpg) 358 sblock.fs_fpg = minfpg; 359 sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode), 360 INOPB(&sblock)); 361 sblock.fs_fpg = roundup(sblock.fs_iblkno + 362 sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag); 363 if (sblock.fs_fpg < minfpg) 364 sblock.fs_fpg = minfpg; 365 sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode), 366 INOPB(&sblock)); 367 if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize) 368 break; 369 density -= sblock.fs_fsize; 370 } 371 if (density != origdensity) 372 printf("density reduced from %d to %d\n", origdensity, density); 373 /* 374 * Start packing more blocks into the cylinder group until 375 * it cannot grow any larger, the number of cylinder groups 376 * drops below MINCYLGRPS, or we reach the size requested. 377 * For UFS1 inodes per cylinder group are stored in an int16_t 378 * so fs_ipg is limited to 2^15 - 1. 379 */ 380 for ( ; sblock.fs_fpg < maxblkspercg; sblock.fs_fpg += sblock.fs_frag) { 381 sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode), 382 INOPB(&sblock)); 383 if (Oflag > 1 || (Oflag == 1 && sblock.fs_ipg <= 0x7fff)) { 384 if (sblock.fs_size / sblock.fs_fpg < MINCYLGRPS) 385 break; 386 if (CGSIZE(&sblock) < (unsigned long)sblock.fs_bsize) 387 continue; 388 if (CGSIZE(&sblock) == (unsigned long)sblock.fs_bsize) 389 break; 390 } 391 sblock.fs_fpg -= sblock.fs_frag; 392 sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode), 393 INOPB(&sblock)); 394 break; 395 } 396 /* 397 * Check to be sure that the last cylinder group has enough blocks 398 * to be viable. If it is too small, reduce the number of blocks 399 * per cylinder group which will have the effect of moving more 400 * blocks into the last cylinder group. 401 */ 402 optimalfpg = sblock.fs_fpg; 403 for (;;) { 404 sblock.fs_ncg = howmany(sblock.fs_size, sblock.fs_fpg); 405 lastminfpg = roundup(sblock.fs_iblkno + 406 sblock.fs_ipg / INOPF(&sblock), sblock.fs_frag); 407 if (sblock.fs_size < lastminfpg) { 408 printf("Filesystem size %jd < minimum size of %d\n", 409 (intmax_t)sblock.fs_size, lastminfpg); 410 exit(28); 411 } 412 if (sblock.fs_size % sblock.fs_fpg >= lastminfpg || 413 sblock.fs_size % sblock.fs_fpg == 0) 414 break; 415 sblock.fs_fpg -= sblock.fs_frag; 416 sblock.fs_ipg = roundup(howmany(sblock.fs_fpg, fragsperinode), 417 INOPB(&sblock)); 418 } 419 if (optimalfpg != sblock.fs_fpg) 420 printf("Reduced frags per cylinder group from %d to %d %s\n", 421 optimalfpg, sblock.fs_fpg, "to enlarge last cyl group"); 422 sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock)); 423 sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock); 424 if (Oflag == 1) { 425 sblock.fs_old_spc = sblock.fs_fpg * sblock.fs_old_nspf; 426 sblock.fs_old_nsect = sblock.fs_old_spc; 427 sblock.fs_old_npsect = sblock.fs_old_spc; 428 sblock.fs_old_ncyl = sblock.fs_ncg; 429 } 430 /* 431 * fill in remaining fields of the super block 432 */ 433 sblock.fs_csaddr = cgdmin(&sblock, 0); 434 sblock.fs_cssize = 435 fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum)); 436 fscs = (struct csum *)calloc(1, sblock.fs_cssize); 437 if (fscs == NULL) 438 errx(31, "calloc failed"); 439 sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs)); 440 if (sblock.fs_sbsize > SBLOCKSIZE) 441 sblock.fs_sbsize = SBLOCKSIZE; 442 if (sblock.fs_sbsize < realsectorsize) 443 sblock.fs_sbsize = realsectorsize; 444 sblock.fs_minfree = minfree; 445 if (metaspace > 0 && metaspace < sblock.fs_fpg / 2) 446 sblock.fs_metaspace = blknum(&sblock, metaspace); 447 else if (metaspace != -1) 448 /* reserve half of minfree for metadata blocks */ 449 sblock.fs_metaspace = blknum(&sblock, 450 (sblock.fs_fpg * minfree) / 200); 451 if (maxbpg == 0) 452 sblock.fs_maxbpg = MAXBLKPG(sblock.fs_bsize); 453 else 454 sblock.fs_maxbpg = maxbpg; 455 sblock.fs_optim = opt; 456 sblock.fs_cgrotor = 0; 457 sblock.fs_pendingblocks = 0; 458 sblock.fs_pendinginodes = 0; 459 sblock.fs_fmod = 0; 460 sblock.fs_ronly = 0; 461 sblock.fs_state = 0; 462 sblock.fs_clean = 1; 463 sblock.fs_id[0] = (long)utime; 464 sblock.fs_id[1] = newfs_random(); 465 sblock.fs_fsmnt[0] = '\0'; 466 csfrags = howmany(sblock.fs_cssize, sblock.fs_fsize); 467 sblock.fs_dsize = sblock.fs_size - sblock.fs_sblkno - 468 sblock.fs_ncg * (sblock.fs_dblkno - sblock.fs_sblkno); 469 sblock.fs_cstotal.cs_nbfree = 470 fragstoblks(&sblock, sblock.fs_dsize) - 471 howmany(csfrags, sblock.fs_frag); 472 sblock.fs_cstotal.cs_nffree = 473 fragnum(&sblock, sblock.fs_size) + 474 (fragnum(&sblock, csfrags) > 0 ? 475 sblock.fs_frag - fragnum(&sblock, csfrags) : 0); 476 sblock.fs_cstotal.cs_nifree = 477 sblock.fs_ncg * sblock.fs_ipg - UFS_ROOTINO; 478 sblock.fs_cstotal.cs_ndir = 0; 479 sblock.fs_dsize -= csfrags; 480 sblock.fs_time = utime; 481 if (Oflag == 1) { 482 sblock.fs_old_time = utime; 483 sblock.fs_old_dsize = sblock.fs_dsize; 484 sblock.fs_old_csaddr = sblock.fs_csaddr; 485 sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir; 486 sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree; 487 sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree; 488 sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree; 489 } 490 /* 491 * Set flags for metadata that is being check-hashed. 492 */ 493 if (Oflag > 1 && getosreldate() >= P_OSREL_CK_CYLGRP) 494 sblock.fs_metackhash = CK_CYLGRP; 495 496 /* 497 * Dump out summary information about file system. 498 */ 499 # define B2MBFACTOR (1 / (1024.0 * 1024.0)) 500 printf("%s: %.1fMB (%jd sectors) block size %d, fragment size %d\n", 501 fsys, (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR, 502 (intmax_t)fsbtodb(&sblock, sblock.fs_size), sblock.fs_bsize, 503 sblock.fs_fsize); 504 printf("\tusing %d cylinder groups of %.2fMB, %d blks, %d inodes.\n", 505 sblock.fs_ncg, (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR, 506 sblock.fs_fpg / sblock.fs_frag, sblock.fs_ipg); 507 if (sblock.fs_flags & FS_DOSOFTDEP) 508 printf("\twith soft updates\n"); 509 # undef B2MBFACTOR 510 511 if (Eflag && !Nflag) { 512 printf("Erasing sectors [%jd...%jd]\n", 513 sblock.fs_sblockloc / disk.d_bsize, 514 fsbtodb(&sblock, sblock.fs_size) - 1); 515 berase(&disk, sblock.fs_sblockloc / disk.d_bsize, 516 sblock.fs_size * sblock.fs_fsize - sblock.fs_sblockloc); 517 } 518 /* 519 * Wipe out old UFS1 superblock(s) if necessary. 520 */ 521 if (!Nflag && Oflag != 1 && realsectorsize <= SBLOCK_UFS1) { 522 i = bread(&disk, part_ofs + SBLOCK_UFS1 / disk.d_bsize, chdummy, 523 SBLOCKSIZE); 524 if (i == -1) 525 err(1, "can't read old UFS1 superblock: %s", 526 disk.d_error); 527 528 if (fsdummy.fs_magic == FS_UFS1_MAGIC) { 529 fsdummy.fs_magic = 0; 530 bwrite(&disk, part_ofs + SBLOCK_UFS1 / disk.d_bsize, 531 chdummy, SBLOCKSIZE); 532 for (cg = 0; cg < fsdummy.fs_ncg; cg++) { 533 if (fsbtodb(&fsdummy, cgsblock(&fsdummy, cg)) > 534 fssize) 535 break; 536 bwrite(&disk, part_ofs + fsbtodb(&fsdummy, 537 cgsblock(&fsdummy, cg)), chdummy, SBLOCKSIZE); 538 } 539 } 540 } 541 if (!Nflag && sbput(disk.d_fd, &disk.d_fs, 0) != 0) 542 err(1, "sbput: %s", disk.d_error); 543 if (Xflag == 1) { 544 printf("** Exiting on Xflag 1\n"); 545 exit(0); 546 } 547 if (Xflag == 2) 548 printf("** Leaving BAD MAGIC on Xflag 2\n"); 549 else 550 sblock.fs_magic = (Oflag != 1) ? FS_UFS2_MAGIC : FS_UFS1_MAGIC; 551 552 /* 553 * Now build the cylinders group blocks and 554 * then print out indices of cylinder groups. 555 */ 556 printf("super-block backups (for fsck_ffs -b #) at:\n"); 557 i = 0; 558 width = charsperline(); 559 /* 560 * Allocate space for two sets of inode blocks. 561 */ 562 iobufsize = 2 * sblock.fs_bsize; 563 if ((iobuf = calloc(1, iobufsize)) == 0) { 564 printf("Cannot allocate I/O buffer\n"); 565 exit(38); 566 } 567 /* 568 * Write out all the cylinder groups and backup superblocks. 569 */ 570 for (cg = 0; cg < sblock.fs_ncg; cg++) { 571 if (!Nflag) 572 initcg(cg, utime); 573 j = snprintf(tmpbuf, sizeof(tmpbuf), " %jd%s", 574 (intmax_t)fsbtodb(&sblock, cgsblock(&sblock, cg)), 575 cg < (sblock.fs_ncg-1) ? "," : ""); 576 if (j < 0) 577 tmpbuf[j = 0] = '\0'; 578 if (i + j >= width) { 579 printf("\n"); 580 i = 0; 581 } 582 i += j; 583 printf("%s", tmpbuf); 584 fflush(stdout); 585 } 586 printf("\n"); 587 if (Nflag) 588 exit(0); 589 /* 590 * Now construct the initial file system, 591 * then write out the super-block. 592 */ 593 fsinit(utime); 594 if (Oflag == 1) { 595 sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir; 596 sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree; 597 sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree; 598 sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree; 599 } 600 if (Xflag == 3) { 601 printf("** Exiting on Xflag 3\n"); 602 exit(0); 603 } 604 /* 605 * Reference the summary information so it will also be written. 606 */ 607 sblock.fs_csp = fscs; 608 if (sbput(disk.d_fd, &disk.d_fs, 0) != 0) 609 err(1, "sbput: %s", disk.d_error); 610 /* 611 * For UFS1 filesystems with a blocksize of 64K, the first 612 * alternate superblock resides at the location used for 613 * the default UFS2 superblock. As there is a valid 614 * superblock at this location, the boot code will use 615 * it as its first choice. Thus we have to ensure that 616 * all of its statistcs on usage are correct. 617 */ 618 if (Oflag == 1 && sblock.fs_bsize == 65536) 619 wtfs(fsbtodb(&sblock, cgsblock(&sblock, 0)), 620 sblock.fs_bsize, (char *)&sblock); 621 /* 622 * Read the last sector of the boot block, replace the last 623 * 20 bytes with the recovery information, then write it back. 624 * The recovery information only works for UFS2 filesystems. 625 */ 626 if (sblock.fs_magic == FS_UFS2_MAGIC) { 627 if ((fsrbuf = malloc(realsectorsize)) == NULL || bread(&disk, 628 part_ofs + (SBLOCK_UFS2 - realsectorsize) / disk.d_bsize, 629 fsrbuf, realsectorsize) == -1) 630 err(1, "can't read recovery area: %s", disk.d_error); 631 fsr = 632 (struct fsrecovery *)&fsrbuf[realsectorsize - sizeof *fsr]; 633 fsr->fsr_magic = sblock.fs_magic; 634 fsr->fsr_fpg = sblock.fs_fpg; 635 fsr->fsr_fsbtodb = sblock.fs_fsbtodb; 636 fsr->fsr_sblkno = sblock.fs_sblkno; 637 fsr->fsr_ncg = sblock.fs_ncg; 638 wtfs((SBLOCK_UFS2 - realsectorsize) / disk.d_bsize, 639 realsectorsize, fsrbuf); 640 free(fsrbuf); 641 } 642 /* 643 * Update information about this partition in pack 644 * label, to that it may be updated on disk. 645 */ 646 if (pp != NULL) { 647 pp->p_fstype = FS_BSDFFS; 648 pp->p_fsize = sblock.fs_fsize; 649 pp->p_frag = sblock.fs_frag; 650 pp->p_cpg = sblock.fs_fpg; 651 } 652 } 653 654 /* 655 * Initialize a cylinder group. 656 */ 657 void 658 initcg(int cylno, time_t utime) 659 { 660 long blkno, start; 661 off_t savedactualloc; 662 uint i, j, d, dlower, dupper; 663 ufs2_daddr_t cbase, dmax; 664 struct ufs1_dinode *dp1; 665 struct ufs2_dinode *dp2; 666 struct csum *cs; 667 668 /* 669 * Determine block bounds for cylinder group. 670 * Allow space for super block summary information in first 671 * cylinder group. 672 */ 673 cbase = cgbase(&sblock, cylno); 674 dmax = cbase + sblock.fs_fpg; 675 if (dmax > sblock.fs_size) 676 dmax = sblock.fs_size; 677 dlower = cgsblock(&sblock, cylno) - cbase; 678 dupper = cgdmin(&sblock, cylno) - cbase; 679 if (cylno == 0) 680 dupper += howmany(sblock.fs_cssize, sblock.fs_fsize); 681 cs = &fscs[cylno]; 682 memset(&acg, 0, sblock.fs_cgsize); 683 acg.cg_time = utime; 684 acg.cg_magic = CG_MAGIC; 685 acg.cg_cgx = cylno; 686 acg.cg_niblk = sblock.fs_ipg; 687 acg.cg_initediblk = MIN(sblock.fs_ipg, 2 * INOPB(&sblock)); 688 acg.cg_ndblk = dmax - cbase; 689 if (sblock.fs_contigsumsize > 0) 690 acg.cg_nclusterblks = acg.cg_ndblk / sblock.fs_frag; 691 start = &acg.cg_space[0] - (u_char *)(&acg.cg_firstfield); 692 if (Oflag == 2) { 693 acg.cg_iusedoff = start; 694 } else { 695 acg.cg_old_ncyl = sblock.fs_old_cpg; 696 acg.cg_old_time = acg.cg_time; 697 acg.cg_time = 0; 698 acg.cg_old_niblk = acg.cg_niblk; 699 acg.cg_niblk = 0; 700 acg.cg_initediblk = 0; 701 acg.cg_old_btotoff = start; 702 acg.cg_old_boff = acg.cg_old_btotoff + 703 sblock.fs_old_cpg * sizeof(int32_t); 704 acg.cg_iusedoff = acg.cg_old_boff + 705 sblock.fs_old_cpg * sizeof(u_int16_t); 706 } 707 acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT); 708 acg.cg_nextfreeoff = acg.cg_freeoff + howmany(sblock.fs_fpg, CHAR_BIT); 709 if (sblock.fs_contigsumsize > 0) { 710 acg.cg_clustersumoff = 711 roundup(acg.cg_nextfreeoff, sizeof(u_int32_t)); 712 acg.cg_clustersumoff -= sizeof(u_int32_t); 713 acg.cg_clusteroff = acg.cg_clustersumoff + 714 (sblock.fs_contigsumsize + 1) * sizeof(u_int32_t); 715 acg.cg_nextfreeoff = acg.cg_clusteroff + 716 howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT); 717 } 718 if (acg.cg_nextfreeoff > (unsigned)sblock.fs_cgsize) { 719 printf("Panic: cylinder group too big\n"); 720 exit(37); 721 } 722 acg.cg_cs.cs_nifree += sblock.fs_ipg; 723 if (cylno == 0) 724 for (i = 0; i < (long)UFS_ROOTINO; i++) { 725 setbit(cg_inosused(&acg), i); 726 acg.cg_cs.cs_nifree--; 727 } 728 if (cylno > 0) { 729 /* 730 * In cylno 0, beginning space is reserved 731 * for boot and super blocks. 732 */ 733 for (d = 0; d < dlower; d += sblock.fs_frag) { 734 blkno = d / sblock.fs_frag; 735 setblock(&sblock, cg_blksfree(&acg), blkno); 736 if (sblock.fs_contigsumsize > 0) 737 setbit(cg_clustersfree(&acg), blkno); 738 acg.cg_cs.cs_nbfree++; 739 } 740 } 741 if ((i = dupper % sblock.fs_frag)) { 742 acg.cg_frsum[sblock.fs_frag - i]++; 743 for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) { 744 setbit(cg_blksfree(&acg), dupper); 745 acg.cg_cs.cs_nffree++; 746 } 747 } 748 for (d = dupper; d + sblock.fs_frag <= acg.cg_ndblk; 749 d += sblock.fs_frag) { 750 blkno = d / sblock.fs_frag; 751 setblock(&sblock, cg_blksfree(&acg), blkno); 752 if (sblock.fs_contigsumsize > 0) 753 setbit(cg_clustersfree(&acg), blkno); 754 acg.cg_cs.cs_nbfree++; 755 } 756 if (d < acg.cg_ndblk) { 757 acg.cg_frsum[acg.cg_ndblk - d]++; 758 for (; d < acg.cg_ndblk; d++) { 759 setbit(cg_blksfree(&acg), d); 760 acg.cg_cs.cs_nffree++; 761 } 762 } 763 if (sblock.fs_contigsumsize > 0) { 764 int32_t *sump = cg_clustersum(&acg); 765 u_char *mapp = cg_clustersfree(&acg); 766 int map = *mapp++; 767 int bit = 1; 768 int run = 0; 769 770 for (i = 0; i < acg.cg_nclusterblks; i++) { 771 if ((map & bit) != 0) 772 run++; 773 else if (run != 0) { 774 if (run > sblock.fs_contigsumsize) 775 run = sblock.fs_contigsumsize; 776 sump[run]++; 777 run = 0; 778 } 779 if ((i & (CHAR_BIT - 1)) != CHAR_BIT - 1) 780 bit <<= 1; 781 else { 782 map = *mapp++; 783 bit = 1; 784 } 785 } 786 if (run != 0) { 787 if (run > sblock.fs_contigsumsize) 788 run = sblock.fs_contigsumsize; 789 sump[run]++; 790 } 791 } 792 *cs = acg.cg_cs; 793 /* 794 * Write out the duplicate super block. Then write the cylinder 795 * group map and two blocks worth of inodes in a single write. 796 */ 797 savedactualloc = sblock.fs_sblockactualloc; 798 sblock.fs_sblockactualloc = 799 dbtob(fsbtodb(&sblock, cgsblock(&sblock, cylno))); 800 if (sbput(disk.d_fd, &disk.d_fs, 0) != 0) 801 err(1, "sbput: %s", disk.d_error); 802 sblock.fs_sblockactualloc = savedactualloc; 803 if (cgput(&disk, &acg) != 0) 804 err(1, "initcg: cgput: %s", disk.d_error); 805 start = 0; 806 dp1 = (struct ufs1_dinode *)(&iobuf[start]); 807 dp2 = (struct ufs2_dinode *)(&iobuf[start]); 808 for (i = 0; i < acg.cg_initediblk; i++) { 809 if (sblock.fs_magic == FS_UFS1_MAGIC) { 810 dp1->di_gen = newfs_random(); 811 dp1++; 812 } else { 813 dp2->di_gen = newfs_random(); 814 dp2++; 815 } 816 } 817 wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno)), iobufsize, iobuf); 818 /* 819 * For the old file system, we have to initialize all the inodes. 820 */ 821 if (Oflag == 1) { 822 for (i = 2 * sblock.fs_frag; 823 i < sblock.fs_ipg / INOPF(&sblock); 824 i += sblock.fs_frag) { 825 dp1 = (struct ufs1_dinode *)(&iobuf[start]); 826 for (j = 0; j < INOPB(&sblock); j++) { 827 dp1->di_gen = newfs_random(); 828 dp1++; 829 } 830 wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i), 831 sblock.fs_bsize, &iobuf[start]); 832 } 833 } 834 } 835 836 /* 837 * initialize the file system 838 */ 839 #define ROOTLINKCNT 3 840 841 static struct direct root_dir[] = { 842 { UFS_ROOTINO, sizeof(struct direct), DT_DIR, 1, "." }, 843 { UFS_ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." }, 844 { UFS_ROOTINO + 1, sizeof(struct direct), DT_DIR, 5, ".snap" }, 845 }; 846 847 #define SNAPLINKCNT 2 848 849 static struct direct snap_dir[] = { 850 { UFS_ROOTINO + 1, sizeof(struct direct), DT_DIR, 1, "." }, 851 { UFS_ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." }, 852 }; 853 854 void 855 fsinit(time_t utime) 856 { 857 union dinode node; 858 struct group *grp; 859 gid_t gid; 860 int entries; 861 862 memset(&node, 0, sizeof node); 863 if ((grp = getgrnam("operator")) != NULL) { 864 gid = grp->gr_gid; 865 } else { 866 warnx("Cannot retrieve operator gid, using gid 0."); 867 gid = 0; 868 } 869 entries = (nflag) ? ROOTLINKCNT - 1: ROOTLINKCNT; 870 if (sblock.fs_magic == FS_UFS1_MAGIC) { 871 /* 872 * initialize the node 873 */ 874 node.dp1.di_atime = utime; 875 node.dp1.di_mtime = utime; 876 node.dp1.di_ctime = utime; 877 /* 878 * create the root directory 879 */ 880 node.dp1.di_mode = IFDIR | UMASK; 881 node.dp1.di_nlink = entries; 882 node.dp1.di_size = makedir(root_dir, entries); 883 node.dp1.di_db[0] = alloc(sblock.fs_fsize, node.dp1.di_mode); 884 node.dp1.di_blocks = 885 btodb(fragroundup(&sblock, node.dp1.di_size)); 886 wtfs(fsbtodb(&sblock, node.dp1.di_db[0]), sblock.fs_fsize, 887 iobuf); 888 iput(&node, UFS_ROOTINO); 889 if (!nflag) { 890 /* 891 * create the .snap directory 892 */ 893 node.dp1.di_mode |= 020; 894 node.dp1.di_gid = gid; 895 node.dp1.di_nlink = SNAPLINKCNT; 896 node.dp1.di_size = makedir(snap_dir, SNAPLINKCNT); 897 node.dp1.di_db[0] = 898 alloc(sblock.fs_fsize, node.dp1.di_mode); 899 node.dp1.di_blocks = 900 btodb(fragroundup(&sblock, node.dp1.di_size)); 901 wtfs(fsbtodb(&sblock, node.dp1.di_db[0]), 902 sblock.fs_fsize, iobuf); 903 iput(&node, UFS_ROOTINO + 1); 904 } 905 } else { 906 /* 907 * initialize the node 908 */ 909 node.dp2.di_atime = utime; 910 node.dp2.di_mtime = utime; 911 node.dp2.di_ctime = utime; 912 node.dp2.di_birthtime = utime; 913 /* 914 * create the root directory 915 */ 916 node.dp2.di_mode = IFDIR | UMASK; 917 node.dp2.di_nlink = entries; 918 node.dp2.di_size = makedir(root_dir, entries); 919 node.dp2.di_db[0] = alloc(sblock.fs_fsize, node.dp2.di_mode); 920 node.dp2.di_blocks = 921 btodb(fragroundup(&sblock, node.dp2.di_size)); 922 wtfs(fsbtodb(&sblock, node.dp2.di_db[0]), sblock.fs_fsize, 923 iobuf); 924 iput(&node, UFS_ROOTINO); 925 if (!nflag) { 926 /* 927 * create the .snap directory 928 */ 929 node.dp2.di_mode |= 020; 930 node.dp2.di_gid = gid; 931 node.dp2.di_nlink = SNAPLINKCNT; 932 node.dp2.di_size = makedir(snap_dir, SNAPLINKCNT); 933 node.dp2.di_db[0] = 934 alloc(sblock.fs_fsize, node.dp2.di_mode); 935 node.dp2.di_blocks = 936 btodb(fragroundup(&sblock, node.dp2.di_size)); 937 wtfs(fsbtodb(&sblock, node.dp2.di_db[0]), 938 sblock.fs_fsize, iobuf); 939 iput(&node, UFS_ROOTINO + 1); 940 } 941 } 942 } 943 944 /* 945 * construct a set of directory entries in "iobuf". 946 * return size of directory. 947 */ 948 int 949 makedir(struct direct *protodir, int entries) 950 { 951 char *cp; 952 int i, spcleft; 953 954 spcleft = DIRBLKSIZ; 955 memset(iobuf, 0, DIRBLKSIZ); 956 for (cp = iobuf, i = 0; i < entries - 1; i++) { 957 protodir[i].d_reclen = DIRSIZ(0, &protodir[i]); 958 memmove(cp, &protodir[i], protodir[i].d_reclen); 959 cp += protodir[i].d_reclen; 960 spcleft -= protodir[i].d_reclen; 961 } 962 protodir[i].d_reclen = spcleft; 963 memmove(cp, &protodir[i], DIRSIZ(0, &protodir[i])); 964 return (DIRBLKSIZ); 965 } 966 967 /* 968 * allocate a block or frag 969 */ 970 ufs2_daddr_t 971 alloc(int size, int mode) 972 { 973 int i, blkno, frag; 974 uint d; 975 976 bread(&disk, part_ofs + fsbtodb(&sblock, cgtod(&sblock, 0)), (char *)&acg, 977 sblock.fs_cgsize); 978 if (acg.cg_magic != CG_MAGIC) { 979 printf("cg 0: bad magic number\n"); 980 exit(38); 981 } 982 if (acg.cg_cs.cs_nbfree == 0) { 983 printf("first cylinder group ran out of space\n"); 984 exit(39); 985 } 986 for (d = 0; d < acg.cg_ndblk; d += sblock.fs_frag) 987 if (isblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag)) 988 goto goth; 989 printf("internal error: can't find block in cyl 0\n"); 990 exit(40); 991 goth: 992 blkno = fragstoblks(&sblock, d); 993 clrblock(&sblock, cg_blksfree(&acg), blkno); 994 if (sblock.fs_contigsumsize > 0) 995 clrbit(cg_clustersfree(&acg), blkno); 996 acg.cg_cs.cs_nbfree--; 997 sblock.fs_cstotal.cs_nbfree--; 998 fscs[0].cs_nbfree--; 999 if (mode & IFDIR) { 1000 acg.cg_cs.cs_ndir++; 1001 sblock.fs_cstotal.cs_ndir++; 1002 fscs[0].cs_ndir++; 1003 } 1004 if (size != sblock.fs_bsize) { 1005 frag = howmany(size, sblock.fs_fsize); 1006 fscs[0].cs_nffree += sblock.fs_frag - frag; 1007 sblock.fs_cstotal.cs_nffree += sblock.fs_frag - frag; 1008 acg.cg_cs.cs_nffree += sblock.fs_frag - frag; 1009 acg.cg_frsum[sblock.fs_frag - frag]++; 1010 for (i = frag; i < sblock.fs_frag; i++) 1011 setbit(cg_blksfree(&acg), d + i); 1012 } 1013 if (cgput(&disk, &acg) != 0) 1014 err(1, "alloc: cgput: %s", disk.d_error); 1015 return ((ufs2_daddr_t)d); 1016 } 1017 1018 /* 1019 * Allocate an inode on the disk 1020 */ 1021 void 1022 iput(union dinode *ip, ino_t ino) 1023 { 1024 ufs2_daddr_t d; 1025 1026 bread(&disk, part_ofs + fsbtodb(&sblock, cgtod(&sblock, 0)), (char *)&acg, 1027 sblock.fs_cgsize); 1028 if (acg.cg_magic != CG_MAGIC) { 1029 printf("cg 0: bad magic number\n"); 1030 exit(31); 1031 } 1032 acg.cg_cs.cs_nifree--; 1033 setbit(cg_inosused(&acg), ino); 1034 if (cgput(&disk, &acg) != 0) 1035 err(1, "iput: cgput: %s", disk.d_error); 1036 sblock.fs_cstotal.cs_nifree--; 1037 fscs[0].cs_nifree--; 1038 if (ino >= (unsigned long)sblock.fs_ipg * sblock.fs_ncg) { 1039 printf("fsinit: inode value out of range (%ju).\n", 1040 (uintmax_t)ino); 1041 exit(32); 1042 } 1043 d = fsbtodb(&sblock, ino_to_fsba(&sblock, ino)); 1044 bread(&disk, part_ofs + d, (char *)iobuf, sblock.fs_bsize); 1045 if (sblock.fs_magic == FS_UFS1_MAGIC) 1046 ((struct ufs1_dinode *)iobuf)[ino_to_fsbo(&sblock, ino)] = 1047 ip->dp1; 1048 else 1049 ((struct ufs2_dinode *)iobuf)[ino_to_fsbo(&sblock, ino)] = 1050 ip->dp2; 1051 wtfs(d, sblock.fs_bsize, (char *)iobuf); 1052 } 1053 1054 /* 1055 * possibly write to disk 1056 */ 1057 static void 1058 wtfs(ufs2_daddr_t bno, int size, char *bf) 1059 { 1060 if (Nflag) 1061 return; 1062 if (bwrite(&disk, part_ofs + bno, bf, size) < 0) 1063 err(36, "wtfs: %d bytes at sector %jd", size, (intmax_t)bno); 1064 } 1065 1066 /* 1067 * check if a block is available 1068 */ 1069 static int 1070 isblock(struct fs *fs, unsigned char *cp, int h) 1071 { 1072 unsigned char mask; 1073 1074 switch (fs->fs_frag) { 1075 case 8: 1076 return (cp[h] == 0xff); 1077 case 4: 1078 mask = 0x0f << ((h & 0x1) << 2); 1079 return ((cp[h >> 1] & mask) == mask); 1080 case 2: 1081 mask = 0x03 << ((h & 0x3) << 1); 1082 return ((cp[h >> 2] & mask) == mask); 1083 case 1: 1084 mask = 0x01 << (h & 0x7); 1085 return ((cp[h >> 3] & mask) == mask); 1086 default: 1087 fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag); 1088 return (0); 1089 } 1090 } 1091 1092 /* 1093 * take a block out of the map 1094 */ 1095 static void 1096 clrblock(struct fs *fs, unsigned char *cp, int h) 1097 { 1098 switch ((fs)->fs_frag) { 1099 case 8: 1100 cp[h] = 0; 1101 return; 1102 case 4: 1103 cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2)); 1104 return; 1105 case 2: 1106 cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1)); 1107 return; 1108 case 1: 1109 cp[h >> 3] &= ~(0x01 << (h & 0x7)); 1110 return; 1111 default: 1112 fprintf(stderr, "clrblock bad fs_frag %d\n", fs->fs_frag); 1113 return; 1114 } 1115 } 1116 1117 /* 1118 * put a block into the map 1119 */ 1120 static void 1121 setblock(struct fs *fs, unsigned char *cp, int h) 1122 { 1123 switch (fs->fs_frag) { 1124 case 8: 1125 cp[h] = 0xff; 1126 return; 1127 case 4: 1128 cp[h >> 1] |= (0x0f << ((h & 0x1) << 2)); 1129 return; 1130 case 2: 1131 cp[h >> 2] |= (0x03 << ((h & 0x3) << 1)); 1132 return; 1133 case 1: 1134 cp[h >> 3] |= (0x01 << (h & 0x7)); 1135 return; 1136 default: 1137 fprintf(stderr, "setblock bad fs_frag %d\n", fs->fs_frag); 1138 return; 1139 } 1140 } 1141 1142 /* 1143 * Determine the number of characters in a 1144 * single line. 1145 */ 1146 1147 static int 1148 charsperline(void) 1149 { 1150 int columns; 1151 char *cp; 1152 struct winsize ws; 1153 1154 columns = 0; 1155 if (ioctl(0, TIOCGWINSZ, &ws) != -1) 1156 columns = ws.ws_col; 1157 if (columns == 0 && (cp = getenv("COLUMNS"))) 1158 columns = atoi(cp); 1159 if (columns == 0) 1160 columns = 80; /* last resort */ 1161 return (columns); 1162 } 1163 1164 static int 1165 ilog2(int val) 1166 { 1167 u_int n; 1168 1169 for (n = 0; n < sizeof(n) * CHAR_BIT; n++) 1170 if (1 << n == val) 1171 return (n); 1172 errx(1, "ilog2: %d is not a power of 2\n", val); 1173 } 1174 1175 /* 1176 * For the regression test, return predictable random values. 1177 * Otherwise use a true random number generator. 1178 */ 1179 static u_int32_t 1180 newfs_random(void) 1181 { 1182 static int nextnum = 1; 1183 1184 if (Rflag) 1185 return (nextnum++); 1186 return (arc4random()); 1187 } 1188