sbin/ffsinfo/ffsinfo.c

   1 /*
   2  * Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
   3  * Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Christoph Herrmann and Thomas-Henning von Kamptz, Munich and Frankfurt.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgment:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors, as well as Christoph
  21  *      Herrmann and Thomas-Henning von Kamptz.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * $TSHeader: src/sbin/ffsinfo/ffsinfo.c,v 1.4 2000/12/12 19:30:55 tomsoft Exp $
  39  *
  40  */
  41
  42 #ifndef lint
  43 static const char copyright[] =
  44 "@(#) Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz\n\
  45 Copyright (c) 1980, 1989, 1993 The Regents of the University of California.\n\
  46 All rights reserved.\n";
  47 #endif /* not lint */
  48
  49 #ifndef lint
  50 static const char rcsid[] =
  51   "$FreeBSD$";
  52 #endif /* not lint */
  53
  54 /* ********************************************************** INCLUDES ***** */
  55 #include <sys/param.h>
  56 #include <sys/disklabel.h>
  57 #include <sys/stat.h>
  58
  59 #include <stdio.h>
  60 #include <paths.h>
  61 #include <ctype.h>
  62 #include <err.h>
  63 #include <fcntl.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67
  68 #include "debug.h"
  69
  70 /* *********************************************************** GLOBALS ***** */
  71 #ifdef FS_DEBUG
  72 int     _dbg_lvl_ = (DL_INFO); /* DL_TRC */
  73 #endif /* FS_DEBUG */
  74
  75 static union {
  76         struct fs       fs;
  77         char    pad[SBSIZE];
  78 } fsun1, fsun2;
  79 #define sblock  fsun1.fs
  80 #define osblock fsun2.fs
  81
  82 static union {
  83         struct cg       cg;
  84         char    pad[MAXBSIZE];
  85 } cgun1;
  86 #define acg     cgun1.cg
  87
  88 static char     ablk[MAXBSIZE];
  89 static char     i1blk[MAXBSIZE];
  90 static char     i2blk[MAXBSIZE];
  91 static char     i3blk[MAXBSIZE];
  92
  93 static struct csum      *fscs;
  94
  95 /* ******************************************************** PROTOTYPES ***** */
  96 static void     rdfs(daddr_t, size_t, void *, int);
  97 static void     usage(void);
  98 static struct disklabel *get_disklabel(int);
  99 static struct dinode    *ginode(ino_t, int);
 100 static void     dump_whole_inode(ino_t, int, int);
 101
 102 /* ************************************************************** rdfs ***** */
 103 /*
 104  * Here we read some block(s) from disk.
 105  */
 106 void
 107 rdfs(daddr_t bno, size_t size, void *bf, int fsi)
 108 {
 109         DBG_FUNC("rdfs")
 110         ssize_t n;
 111
 112         DBG_ENTER;
 113
 114         if (lseek(fsi, (off_t)bno * DEV_BSIZE, 0) < 0) {
 115                 err(33, "rdfs: seek error: %ld", (long)bno);
 116         }
 117         n = read(fsi, bf, size);
 118         if (n != (ssize_t)size) {
 119                 err(34, "rdfs: read error: %ld", (long)bno);
 120         }
 121
 122         DBG_LEAVE;
 123         return;
 124 }
 125
 126 /* ************************************************************** main ***** */
 127 /*
 128  * ffsinfo(8) is a tool to dump all metadata of a file system. It helps to find
 129  * errors is the file system much easier. You can run ffsinfo before and  after
 130  * an  fsck(8),  and compare the two ascii dumps easy with diff, and  you  see
 131  * directly where the problem is. You can control how much detail you want  to
 132  * see  with some command line arguments. You can also easy check  the  status
 133  * of  a file system, like is there is enough space for growing  a  file system,
 134  * or  how  many active snapshots do we have. It provides much  more  detailed
 135  * information  then dumpfs. Snapshots, as they are very new, are  not  really
 136  * supported.  They  are just mentioned currently, but it is  planned  to  run
 137  * also over active snapshots, to even get that output.
 138  */
 139 int
 140 main(int argc, char **argv)
 141 {
 142         DBG_FUNC("main")
 143         char    *device, *special, *cp;
 144         char    ch;
 145         size_t  len;
 146         struct stat     st;
 147         struct disklabel        *lp;
 148         struct partition        *pp;
 149         int     fsi;
 150         struct csum     *dbg_csp;
 151         int     dbg_csc;
 152         char    dbg_line[80];
 153         int     cylno,i;
 154         int     cfg_cg, cfg_in, cfg_lv;
 155         int     cg_start, cg_stop;
 156         ino_t   in;
 157         char    *out_file;
 158         int     Lflag=0;
 159
 160         DBG_ENTER;
 161
 162         cfg_lv=0xff;
 163         cfg_in=-2;
 164         cfg_cg=-2;
 165         out_file=strdup("/var/tmp/ffsinfo");
 166         if(out_file == NULL) {
 167                 errx(1, "strdup failed");
 168         }
 169
 170         while ((ch=getopt(argc, argv, "Lg:i:l:o:")) != -1) {
 171                 switch(ch) {
 172                 case 'L':
 173                         Lflag=1;
 174                         break;
 175                 case 'g':
 176                         cfg_cg=atol(optarg);
 177                         if(cfg_cg < -1) {
 178                                 usage();
 179                         }
 180                         break;
 181                 case 'i':
 182                         cfg_in=atol(optarg);
 183                         if(cfg_in < 0) {
 184                                 usage();
 185                         }
 186                         break;
 187                 case 'l':
 188                         cfg_lv=atol(optarg);
 189                         if(cfg_lv < 0x1||cfg_lv > 0x3ff) {
 190                                 usage();
 191                         }
 192                         break;
 193                 case 'o':
 194                         free(out_file);
 195                         out_file=strdup(optarg);
 196                         if(out_file == NULL) {
 197                                 errx(1, "strdup failed");
 198                         }
 199                         break;
 200                 case '?':
 201                         /* FALLTHROUGH */
 202                 default:
 203                         usage();
 204                 }
 205         }
 206         argc -= optind;
 207         argv += optind;
 208
 209         if(argc != 1) {
 210                 usage();
 211         }
 212         device=*argv;
 213
 214         /*
 215          * Now we try to guess the (raw)device name.
 216          */
 217         if (0 == strrchr(device, '/') && (stat(device, &st) == -1)) {
 218                 /*
 219                  * No path prefix was given, so try in that order:
 220                  *     /dev/r%s
 221                  *     /dev/%s
 222                  *     /dev/vinum/r%s
 223                  *     /dev/vinum/%s.
 224                  *
 225                  * FreeBSD now doesn't distinguish between raw and  block
 226                  * devices any longer, but it should still work this way.
 227                  */
 228                 len=strlen(device)+strlen(_PATH_DEV)+2+strlen("vinum/");
 229                 special=(char *)malloc(len);
 230                 if(special == NULL) {
 231                         errx(1, "malloc failed");
 232                 }
 233                 snprintf(special, len, "%sr%s", _PATH_DEV, device);
 234                 if (stat(special, &st) == -1) {
 235                         snprintf(special, len, "%s%s", _PATH_DEV, device);
 236                         if (stat(special, &st) == -1) {
 237                                 snprintf(special, len, "%svinum/r%s",
 238                                     _PATH_DEV, device);
 239                                 if (stat(special, &st) == -1) {
 240                                         /*
 241                                          * For now this is the 'last resort'.
 242                                          */
 243                                         snprintf(special, len, "%svinum/%s",
 244                                             _PATH_DEV, device);
 245                                 }
 246                         }
 247                 }
 248                 device = special;
 249         }
 250
 251         /*
 252          * Open our device for reading.
 253          */
 254         fsi = open(device, O_RDONLY);
 255         if (fsi < 0) {
 256                 err(1, "%s", device);
 257         }
 258
 259         stat(device, &st);
 260
 261         if(S_ISREG(st.st_mode)) { /* label check not supported for files */
 262                 Lflag=1;
 263         }
 264
 265         if(!Lflag) {
 266                 /*
 267                  * Try  to read a label and gess the slice if not  specified.
 268                  * This code should guess the right thing and avaid to bother
 269                  * the user user with the task of specifying the option -v on
 270                  * vinum volumes.
 271                  */
 272                 cp=device+strlen(device)-1;
 273                 lp = get_disklabel(fsi);
 274                 if(lp->d_type == DTYPE_VINUM) {
 275                         pp = &lp->d_partitions[0];
 276                 } else if (isdigit(*cp)) {
 277                         pp = &lp->d_partitions[2];
 278                 } else if (*cp>='a' && *cp<='h') {
 279                         pp = &lp->d_partitions[*cp - 'a'];
 280                 } else {
 281                         errx(1, "unknown device");
 282                 }
 283
 284                 /*
 285                  * Check if that partition looks suited for dumping.
 286                  */
 287                 if (pp->p_size < 1) {
 288                         errx(1, "partition is unavailable");
 289                 }
 290                 if (pp->p_fstype != FS_BSDFFS) {
 291                         errx(1, "partition not 4.2BSD");
 292                 }
 293         }
 294
 295         /*
 296          * Read the current superblock.
 297          */
 298         rdfs((daddr_t)(SBOFF/DEV_BSIZE), (size_t)SBSIZE, (void *)&sblock, fsi);
 299         if (sblock.fs_magic != FS_MAGIC) {
 300                 errx(1, "superblock not recognized");
 301         }
 302
 303         DBG_OPEN(out_file); /* already here we need a superblock */
 304
 305         if(cfg_lv & 0x001) {
 306                 DBG_DUMP_FS(&sblock,
 307                     "primary sblock");
 308         }
 309
 310         /*
 311          * Determine here what cylinder groups to dump.
 312          */
 313         if(cfg_cg==-2) {
 314                 cg_start=0;
 315                 cg_stop=sblock.fs_ncg;
 316         } else if (cfg_cg==-1) {
 317                 cg_start=sblock.fs_ncg-1;
 318                 cg_stop=sblock.fs_ncg;
 319         } else if (cfg_cg<sblock.fs_ncg) {
 320                 cg_start=cfg_cg;
 321                 cg_stop=cfg_cg+1;
 322         } else {
 323                 cg_start=sblock.fs_ncg;
 324                 cg_stop=sblock.fs_ncg;
 325         }
 326
 327         if (cfg_lv & 0x004) {
 328                 fscs = (struct csum *)calloc((size_t)1,
 329                     (size_t)sblock.fs_cssize);
 330                 if(fscs == NULL) {
 331                         errx(1, "calloc failed");
 332                 }
 333
 334                 /*
 335                  * Get the cylinder summary into the memory ...
 336                  */
 337                 for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize) {
 338                         rdfs(fsbtodb(&sblock, sblock.fs_csaddr +
 339                             numfrags(&sblock, i)), (size_t)(sblock.fs_cssize-i<
 340                             sblock.fs_bsize ? sblock.fs_cssize - i :
 341                             sblock.fs_bsize), (void *)(((char *)fscs)+i), fsi);
 342                 }
 343
 344                 dbg_csp=fscs;
 345                 /*
 346                  * ... and dump it.
 347                  */
 348                 for(dbg_csc=0; dbg_csc<sblock.fs_ncg; dbg_csc++) {
 349                         snprintf(dbg_line, sizeof(dbg_line),
 350                             "%d. csum in fscs", dbg_csc);
 351                         DBG_DUMP_CSUM(&sblock,
 352                             dbg_line,
 353                             dbg_csp++);
 354                 }
 355         }
 356
 357         /*
 358          * For each requested cylinder group ...
 359          */
 360         for(cylno=cg_start; cylno<cg_stop; cylno++) {
 361                 snprintf(dbg_line, sizeof(dbg_line), "cgr %d", cylno);
 362                 if(cfg_lv & 0x002) {
 363                         /*
 364                          * ... dump the superblock copies ...
 365                          */
 366                         rdfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 367                             (size_t)SBSIZE, (void *)&osblock, fsi);
 368                         DBG_DUMP_FS(&osblock,
 369                             dbg_line);
 370                 }
 371                 /*
 372                  * ... read the cylinder group and dump whatever was requested.
 373                  */
 374                 rdfs(fsbtodb(&sblock, cgtod(&sblock, cylno)),
 375                     (size_t)sblock.fs_cgsize, (void *)&acg, fsi);
 376                 if(cfg_lv & 0x008) {
 377                         DBG_DUMP_CG(&sblock,
 378                             dbg_line,
 379                             &acg);
 380                 }
 381                 if(cfg_lv & 0x010) {
 382                         DBG_DUMP_INMAP(&sblock,
 383                             dbg_line,
 384                             &acg);
 385                 }
 386                 if(cfg_lv & 0x020) {
 387                         DBG_DUMP_FRMAP(&sblock,
 388                             dbg_line,
 389                             &acg);
 390                 }
 391                 if(cfg_lv & 0x040) {
 392                         DBG_DUMP_CLMAP(&sblock,
 393                             dbg_line,
 394                             &acg);
 395                         DBG_DUMP_CLSUM(&sblock,
 396                             dbg_line,
 397                             &acg);
 398                 }
 399                 if(cfg_lv & 0x080) {
 400                         DBG_DUMP_SPTBL(&sblock,
 401                             dbg_line,
 402                             &acg);
 403                 }
 404         }
 405         /*
 406          * Dump the requested inode(s).
 407          */
 408         if(cfg_in != -2) {
 409                 dump_whole_inode((ino_t)cfg_in, fsi, cfg_lv);
 410         } else {
 411                 for(in=cg_start*sblock.fs_ipg; in<(ino_t)cg_stop*sblock.fs_ipg;
 412                     in++) {
 413                         dump_whole_inode(in, fsi, cfg_lv);
 414                 }
 415         }
 416
 417         DBG_CLOSE;
 418
 419         close(fsi);
 420
 421         DBG_LEAVE;
 422         return 0;
 423 }
 424
 425 /* ************************************************** dump_whole_inode ***** */
 426 /*
 427  * Here we dump a list of all blocks allocated by this inode. We follow
 428  * all indirect blocks.
 429  */
 430 void
 431 dump_whole_inode(ino_t inode, int fsi, int level)
 432 {
 433         DBG_FUNC("dump_whole_inode")
 434         struct dinode   *ino;
 435         int     rb;
 436         unsigned int    ind2ctr, ind3ctr;
 437         ufs_daddr_t     *ind2ptr, *ind3ptr;
 438         char    comment[80];
 439
 440         DBG_ENTER;
 441
 442         /*
 443          * Read the inode from disk/cache.
 444          */
 445         ino=ginode(inode, fsi);
 446
 447         if(ino->di_nlink==0) {
 448                 DBG_LEAVE;
 449                 return; /* inode not in use */
 450         }
 451
 452         /*
 453          * Dump the main inode structure.
 454          */
 455         snprintf(comment, sizeof(comment), "Inode 0x%08x", inode);
 456         if (level & 0x100) {
 457                 DBG_DUMP_INO(&sblock,
 458                     comment,
 459                     ino);
 460         }
 461
 462         if (!(level & 0x200)) {
 463                 DBG_LEAVE;
 464                 return;
 465         }
 466
 467         /*
 468          * Ok, now prepare for dumping all direct and indirect pointers.
 469          */
 470         rb=howmany(ino->di_size, sblock.fs_bsize)-NDADDR;
 471         if(rb>0) {
 472                 /*
 473                  * Dump single indirect block.
 474                  */
 475                 rdfs(fsbtodb(&sblock, ino->di_ib[0]), (size_t)sblock.fs_bsize,
 476                     (void *)&i1blk, fsi);
 477                 snprintf(comment, sizeof(comment), "Inode 0x%08x: indirect 0",
 478                     inode);
 479                 DBG_DUMP_IBLK(&sblock,
 480                     comment,
 481                     i1blk,
 482                     (size_t)rb);
 483                 rb-=howmany(sblock.fs_bsize, sizeof(ufs_daddr_t));
 484         }
 485         if(rb>0) {
 486                 /*
 487                  * Dump double indirect blocks.
 488                  */
 489                 rdfs(fsbtodb(&sblock, ino->di_ib[1]), (size_t)sblock.fs_bsize,
 490                     (void *)&i2blk, fsi);
 491                 snprintf(comment, sizeof(comment), "Inode 0x%08x: indirect 1",
 492                     inode);
 493                 DBG_DUMP_IBLK(&sblock,
 494                     comment,
 495                     i2blk,
 496                     howmany(rb, howmany(sblock.fs_bsize, sizeof(ufs_daddr_t))));
 497                 for(ind2ctr=0; ((ind2ctr < howmany(sblock.fs_bsize,
 498                     sizeof(ufs_daddr_t)))&&(rb>0)); ind2ctr++) {
 499                         ind2ptr=&((ufs_daddr_t *)(void *)&i2blk)[ind2ctr];
 500
 501                         rdfs(fsbtodb(&sblock, *ind2ptr),
 502                             (size_t)sblock.fs_bsize, (void *)&i1blk, fsi);
 503                         snprintf(comment, sizeof(comment),
 504                             "Inode 0x%08x: indirect 1->%d", inode, ind2ctr);
 505                         DBG_DUMP_IBLK(&sblock,
 506                             comment,
 507                             i1blk,
 508                             (size_t)rb);
 509                         rb-=howmany(sblock.fs_bsize, sizeof(ufs_daddr_t));
 510                 }
 511         }
 512         if(rb>0) {
 513                 /*
 514                  * Dump triple indirect blocks.
 515                  */
 516                 rdfs(fsbtodb(&sblock, ino->di_ib[2]), (size_t)sblock.fs_bsize,
 517                     (void *)&i3blk, fsi);
 518                 snprintf(comment, sizeof(comment), "Inode 0x%08x: indirect 2",
 519                     inode);
 520 #define SQUARE(a) ((a)*(a))
 521                 DBG_DUMP_IBLK(&sblock,
 522                     comment,
 523                     i3blk,
 524                     howmany(rb,
 525                       SQUARE(howmany(sblock.fs_bsize, sizeof(ufs_daddr_t)))));
 526 #undef SQUARE
 527                 for(ind3ctr=0; ((ind3ctr < howmany(sblock.fs_bsize,
 528                     sizeof(ufs_daddr_t)))&&(rb>0)); ind3ctr ++) {
 529                         ind3ptr=&((ufs_daddr_t *)(void *)&i3blk)[ind3ctr];
 530
 531                         rdfs(fsbtodb(&sblock, *ind3ptr),
 532                             (size_t)sblock.fs_bsize, (void *)&i2blk, fsi);
 533                         snprintf(comment, sizeof(comment),
 534                             "Inode 0x%08x: indirect 2->%d", inode, ind3ctr);
 535                         DBG_DUMP_IBLK(&sblock,
 536                             comment,
 537                             i2blk,
 538                             howmany(rb,
 539                               howmany(sblock.fs_bsize, sizeof(ufs_daddr_t))));
 540                         for(ind2ctr=0; ((ind2ctr < howmany(sblock.fs_bsize,
 541                             sizeof(ufs_daddr_t)))&&(rb>0)); ind2ctr ++) {
 542                                 ind2ptr=&((ufs_daddr_t *)(void *)&i2blk)
 543                                     [ind2ctr];
 544                                 rdfs(fsbtodb(&sblock, *ind2ptr),
 545                                     (size_t)sblock.fs_bsize, (void *)&i1blk,
 546                                     fsi);
 547                                 snprintf(comment, sizeof(comment),
 548                                     "Inode 0x%08x: indirect 2->%d->%d", inode,
 549                                     ind3ctr, ind3ctr);
 550                                 DBG_DUMP_IBLK(&sblock,
 551                                     comment,
 552                                     i1blk,
 553                                     (size_t)rb);
 554                                 rb-=howmany(sblock.fs_bsize,
 555                                     sizeof(ufs_daddr_t));
 556                         }
 557                 }
 558         }
 559
 560         DBG_LEAVE;
 561         return;
 562 }
 563
 564 /* ***************************************************** get_disklabel ***** */
 565 /*
 566  * Read the disklabel from disk.
 567  */
 568 struct disklabel *
 569 get_disklabel(int fd)
 570 {
 571         DBG_FUNC("get_disklabel")
 572         static struct disklabel *lab;
 573
 574         DBG_ENTER;
 575
 576         lab=(struct disklabel *)malloc(sizeof(struct disklabel));
 577         if (!lab) {
 578                 errx(1, "malloc failed");
 579         }
 580         if (ioctl(fd, DIOCGDINFO, (char *)lab) < 0) {
 581                 errx(1, "DIOCGDINFO failed");
 582                 exit(-1);
 583         }
 584
 585         DBG_LEAVE;
 586         return (lab);
 587 }
 588
 589
 590 /* ************************************************************* usage ***** */
 591 /*
 592  * Dump a line of usage.
 593  */
 594 void
 595 usage(void)
 596 {
 597         DBG_FUNC("usage")
 598
 599         DBG_ENTER;
 600
 601         fprintf(stderr,
 602             "usage: ffsinfo [-L] [-g cylgrp] [-i inode] [-l level] "
 603             "[-o outfile]\n"
 604             "               special | file\n");
 605
 606         DBG_LEAVE;
 607         exit(1);
 608 }
 609
 610 /* ************************************************************ ginode ***** */
 611 /*
 612  * This function provides access to an individual inode. We find out in which
 613  * block  the  requested inode is located, read it from disk if  needed,  and
 614  * return  the pointer into that block. We maintain a cache of one  block  to
 615  * not  read the same block again and again if we iterate linearly  over  all
 616  * inodes.
 617  */
 618 struct dinode *
 619 ginode(ino_t inumber, int fsi)
 620 {
 621         DBG_FUNC("ginode")
 622         ufs_daddr_t     iblk;
 623         static ino_t    startinum=0;    /* first inode in cached block */
 624         struct dinode   *pi;
 625
 626         DBG_ENTER;
 627
 628         pi=(struct dinode *)(void *)ablk;
 629         if (startinum == 0 || inumber < startinum ||
 630             inumber >= startinum + INOPB(&sblock)) {
 631                 /*
 632                  * The block needed is not cached, so we have to read it from
 633                  * disk now.
 634                  */
 635                 iblk = ino_to_fsba(&sblock, inumber);
 636                 rdfs(fsbtodb(&sblock, iblk), (size_t)sblock.fs_bsize,
 637                     (void *)&ablk, fsi);
 638                 startinum = (inumber / INOPB(&sblock)) * INOPB(&sblock);
 639         }
 640
 641         DBG_LEAVE;
 642         return (&(pi[inumber % INOPB(&sblock)]));
 643 }
 644