sbin/fsck/pass1.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)pass1.c  8.6 (Berkeley) 4/28/95
  30  * $FreeBSD: src/sbin/fsck/pass1.c,v 1.16.2.5 2002/06/23 22:34:58 iedowse Exp $
  31  */
  32
  33 #include <sys/param.h>
  34
  35 #include <vfs/ufs/dinode.h>
  36 #include <vfs/ufs/dir.h>
  37 #include <vfs/ufs/fs.h>
  38
  39 #include <err.h>
  40 #include <string.h>
  41
  42 #include "fsck.h"
  43
  44 struct inostatlist *inostathead; /* A list of inode state information */
  45 struct dups *muldup;            /* end of unique duplicate dup block numbers */
  46 long countdirs;                 /* number of directories we actually found */
  47 ufs_daddr_t n_blks;             /* number of blocks in use */
  48 ufs_daddr_t n_files;            /* number of files in use */
  49
  50 static ufs_daddr_t badblk;
  51 static ufs_daddr_t dupblk;
  52 static ufs1_ino_t lastino;              /* last inode in use */
  53
  54 static void checkinode(ufs1_ino_t inumber, struct inodesc *);
  55
  56 void
  57 pass1(void)
  58 {
  59         u_int8_t *cp;
  60         ufs1_ino_t inumber;
  61         int c, i, cgd, inosused;
  62         struct inostat *info;
  63         struct inodesc idesc;
  64
  65         /*
  66          * Set file system reserved blocks in used block map.
  67          */
  68         for (c = 0; c < sblock.fs_ncg; c++) {
  69                 cgd = cgdmin(&sblock, c);
  70                 if (c == 0) {
  71                         i = cgbase(&sblock, c);
  72                 } else
  73                         i = cgsblock(&sblock, c);
  74                 for (; i < cgd; i++)
  75                         setbmap(i);
  76         }
  77         i = sblock.fs_csaddr;
  78         cgd = i+ howmany(sblock.fs_cssize, sblock.fs_fsize);
  79         for (; i < cgd; i++)
  80                 setbmap(i);
  81         /*
  82          * Find all allocated blocks.
  83          */
  84         memset(&idesc, 0, sizeof(struct inodesc));
  85         idesc.id_type = ADDR;
  86         idesc.id_func = pass1check;
  87         n_files = n_blks = 0;
  88         for (c = 0; c < sblock.fs_ncg; c++) {
  89                 inumber = c * sblock.fs_ipg;
  90                 setinodebuf(inumber);
  91                 inosused = sblock.fs_ipg;
  92                 if (got_siginfo) {
  93                         printf("%s: phase 1: cyl group %d of %d (%d%%)\n",
  94                             cdevname, c, sblock.fs_ncg,
  95                             c * 100 / sblock.fs_ncg);
  96                         got_siginfo = 0;
  97                 }
  98                 /*
  99                  * If we are using soft updates, then we can trust the
 100                  * cylinder group inode allocation maps to tell us which
 101                  * inodes are allocated. We will scan the used inode map
 102                  * to find the inodes that are really in use, and then
 103                  * read only those inodes in from disk.
 104                  */
 105                 if (preen && usedsoftdep) {
 106                         getblk(&cgblk, cgtod(&sblock, c), sblock.fs_cgsize);
 107                         if (!cg_chkmagic(&cgrp))
 108                                 pfatal("CG %d: BAD MAGIC NUMBER\n", c);
 109                         cp = &cg_inosused(&cgrp)[(sblock.fs_ipg - 1) / NBBY];
 110                         for ( ; inosused > 0; inosused -= NBBY, cp--) {
 111                                 if (*cp == 0)
 112                                         continue;
 113                                 for (i = 1 << (NBBY - 1); i > 0; i >>= 1) {
 114                                         if (*cp & i)
 115                                                 break;
 116                                         inosused--;
 117                                 }
 118                                 break;
 119                         }
 120                         if (inosused < 0)
 121                                 inosused = 0;
 122                 }
 123                 /*
 124                  * Allocate inoinfo structures for the allocated inodes.
 125                  */
 126                 inostathead[c].il_numalloced = inosused;
 127                 if (inosused == 0) {
 128                         inostathead[c].il_stat = 0;
 129                         continue;
 130                 }
 131                 info = calloc((unsigned)inosused, sizeof(struct inostat));
 132                 if (info == NULL)
 133                         pfatal("cannot alloc %u bytes for inoinfo\n",
 134                             (unsigned)(sizeof(struct inostat) * inosused));
 135                 inostathead[c].il_stat = info;
 136                 /*
 137                  * Scan the allocated inodes.
 138                  */
 139                 for (i = 0; i < inosused; i++, inumber++) {
 140                         if (inumber < UFS_ROOTINO) {
 141                                 getnextinode(inumber);
 142                                 continue;
 143                         }
 144                         checkinode(inumber, &idesc);
 145                 }
 146                 lastino += 1;
 147                 if (inosused < sblock.fs_ipg || inumber == lastino)
 148                         continue;
 149                 /*
 150                  * If we were not able to determine in advance which inodes
 151                  * were in use, then reduce the size of the inoinfo structure
 152                  * to the size necessary to describe the inodes that we
 153                  * really found.
 154                  */
 155                 inosused = lastino - (c * sblock.fs_ipg);
 156                 if (inosused < 0)
 157                         inosused = 0;
 158                 inostathead[c].il_numalloced = inosused;
 159                 if (inosused == 0) {
 160                         free(inostathead[c].il_stat);
 161                         inostathead[c].il_stat = 0;
 162                         continue;
 163                 }
 164                 info = calloc((unsigned)inosused, sizeof(struct inostat));
 165                 if (info == NULL)
 166                         pfatal("cannot alloc %u bytes for inoinfo\n",
 167                             (unsigned)(sizeof(struct inostat) * inosused));
 168                 memmove(info, inostathead[c].il_stat, inosused * sizeof(*info));
 169                 free(inostathead[c].il_stat);
 170                 inostathead[c].il_stat = info;
 171         }
 172         freeinodebuf();
 173 }
 174
 175 static void
 176 checkinode(ufs1_ino_t inumber, struct inodesc *idesc)
 177 {
 178         struct ufs1_dinode *dp;
 179         struct zlncnt *zlnp;
 180         u_int64_t kernmaxfilesize;
 181         ufs_daddr_t ndb, j;
 182         mode_t mode;
 183         char *symbuf;
 184
 185         dp = getnextinode(inumber);
 186         mode = dp->di_mode & IFMT;
 187         if (mode == 0) {
 188                 if (memcmp(dp->di_db, zino.di_db,
 189                         UFS_NDADDR * sizeof(ufs_daddr_t)) ||
 190                     memcmp(dp->di_ib, zino.di_ib,
 191                         UFS_NIADDR * sizeof(ufs_daddr_t)) ||
 192                     dp->di_mode || dp->di_size) {
 193                         pfatal("PARTIALLY ALLOCATED INODE I=%u", inumber);
 194                         if (reply("CLEAR") == 1) {
 195                                 dp = ginode(inumber);
 196                                 clearinode(dp);
 197                                 inodirty();
 198                         }
 199                 }
 200                 inoinfo(inumber)->ino_state = USTATE;
 201                 return;
 202         }
 203         lastino = inumber;
 204         /* This should match the file size limit in ffs_mountfs(). */
 205         kernmaxfilesize = (u_int64_t)0x40000000 * sblock.fs_bsize - 1;
 206         if (kernmaxfilesize > (u_int64_t)0x80000000u * PAGE_SIZE - 1)
 207                 kernmaxfilesize = (u_int64_t)0x80000000u * PAGE_SIZE - 1;
 208         if (dp->di_size > kernmaxfilesize ||
 209             dp->di_size > sblock.fs_maxfilesize ||
 210             (mode == IFDIR && dp->di_size > MAXDIRSIZE)) {
 211                 if (debug)
 212                         printf("bad size %ju:", (uintmax_t)dp->di_size);
 213                 goto unknown;
 214         }
 215         if (!preen && mode == IFMT && reply("HOLD BAD BLOCK") == 1) {
 216                 dp = ginode(inumber);
 217                 dp->di_size = sblock.fs_fsize;
 218                 dp->di_mode = IFREG|0600;
 219                 inodirty();
 220         }
 221         if ((mode == IFBLK || mode == IFCHR || mode == IFIFO ||
 222              mode == IFSOCK) && dp->di_size != 0) {
 223                 if (debug)
 224                         printf("bad special-file size %ju:", (uintmax_t)dp->di_size);
 225                 goto unknown;
 226         }
 227         ndb = howmany(dp->di_size, sblock.fs_bsize);
 228         if (ndb < 0) {
 229                 if (debug)
 230                         printf("bad size %ju ndb %d:",
 231                                 (uintmax_t)dp->di_size, ndb);
 232                 goto unknown;
 233         }
 234         if (mode == IFBLK || mode == IFCHR)
 235                 ndb++;
 236         if (mode == IFLNK) {
 237                 if (doinglevel2 &&
 238                     dp->di_size > 0 && dp->di_size < UFS1_MAXSYMLINKLEN &&
 239                     dp->di_blocks != 0) {
 240                         symbuf = alloca(secsize);
 241                         if (bread(fsreadfd, symbuf,
 242                             fsbtodb(&sblock, dp->di_db[0]),
 243                             (long)secsize) != 0)
 244                                 errx(EEXIT, "cannot read symlink");
 245                         if (debug) {
 246                                 symbuf[dp->di_size] = 0;
 247                                 printf("convert symlink %lu(%s) of size %ld\n",
 248                                     (u_long)inumber, symbuf, (long)dp->di_size);
 249                         }
 250                         dp = ginode(inumber);
 251                         memmove(dp->di_shortlink, symbuf, (long)dp->di_size);
 252                         dp->di_blocks = 0;
 253                         inodirty();
 254                 }
 255                 /*
 256                  * Fake ndb value so direct/indirect block checks below
 257                  * will detect any garbage after symlink string.
 258                  */
 259                 if (dp->di_size < sblock.fs_maxsymlinklen) {
 260                         ndb = howmany(dp->di_size, sizeof(ufs_daddr_t));
 261                         if (ndb > UFS_NDADDR) {
 262                                 j = ndb - UFS_NDADDR;
 263                                 for (ndb = 1; j > 1; j--)
 264                                         ndb *= NINDIR(&sblock);
 265                                 ndb += UFS_NDADDR;
 266                         }
 267                 }
 268         }
 269         for (j = ndb; j < UFS_NDADDR; j++)
 270                 if (dp->di_db[j] != 0) {
 271                         if (debug)
 272                                 printf("bad direct addr: %ld\n",
 273                                     (long)dp->di_db[j]);
 274                         goto unknown;
 275                 }
 276         for (j = 0, ndb -= UFS_NDADDR; ndb > 0; j++)
 277                 ndb /= NINDIR(&sblock);
 278         for (; j < UFS_NIADDR; j++)
 279                 if (dp->di_ib[j] != 0) {
 280                         if (debug)
 281                                 printf("bad indirect addr: %ld\n",
 282                                     (long)dp->di_ib[j]);
 283                         goto unknown;
 284                 }
 285         if (ftypeok(dp) == 0)
 286                 goto unknown;
 287         n_files++;
 288         inoinfo(inumber)->ino_linkcnt = dp->di_nlink;
 289         if (dp->di_nlink <= 0) {
 290                 zlnp = (struct zlncnt *)malloc(sizeof *zlnp);
 291                 if (zlnp == NULL) {
 292                         pfatal("LINK COUNT TABLE OVERFLOW");
 293                         if (reply("CONTINUE") == 0) {
 294                                 ckfini(0);
 295                                 exit(EEXIT);
 296                         }
 297                 } else {
 298                         zlnp->zlncnt = inumber;
 299                         zlnp->next = zlnhead;
 300                         zlnhead = zlnp;
 301                 }
 302         }
 303         if (mode == IFDIR) {
 304                 if (dp->di_size == 0)
 305                         inoinfo(inumber)->ino_state = DCLEAR;
 306                 else
 307                         inoinfo(inumber)->ino_state = DSTATE;
 308                 cacheino(dp, inumber);
 309                 countdirs++;
 310         } else
 311                 inoinfo(inumber)->ino_state = FSTATE;
 312         inoinfo(inumber)->ino_type = IFTODT(mode);
 313         if (doinglevel2 &&
 314             (dp->di_ouid != (u_short)-1 || dp->di_ogid != (u_short)-1)) {
 315                 dp = ginode(inumber);
 316                 dp->di_uid = dp->di_ouid;
 317                 dp->di_ouid = -1;
 318                 dp->di_gid = dp->di_ogid;
 319                 dp->di_ogid = -1;
 320                 inodirty();
 321         }
 322         badblk = dupblk = 0;
 323         idesc->id_number = inumber;
 324         ckinode(dp, idesc);
 325         idesc->id_entryno *= btodb(sblock.fs_fsize);
 326         if (dp->di_blocks != idesc->id_entryno) {
 327                 pwarn("INCORRECT BLOCK COUNT I=%u (%d should be %d)",
 328                     inumber, dp->di_blocks, idesc->id_entryno);
 329                 if (preen)
 330                         printf(" (CORRECTED)\n");
 331                 else if (reply("CORRECT") == 0)
 332                         return;
 333                 dp = ginode(inumber);
 334                 dp->di_blocks = idesc->id_entryno;
 335                 inodirty();
 336         }
 337         return;
 338 unknown:
 339         pfatal("UNKNOWN FILE TYPE I=%u", inumber);
 340         inoinfo(inumber)->ino_state = FCLEAR;
 341         if (reply("CLEAR") == 1) {
 342                 inoinfo(inumber)->ino_state = USTATE;
 343                 dp = ginode(inumber);
 344                 clearinode(dp);
 345                 inodirty();
 346         }
 347 }
 348
 349 int
 350 pass1check(struct inodesc *idesc)
 351 {
 352         int res = KEEPON;
 353         int anyout, nfrags;
 354         ufs_daddr_t blkno = idesc->id_blkno;
 355         struct dups *dlp;
 356         struct dups *new;
 357
 358         if ((anyout = chkrange(blkno, idesc->id_numfrags)) != 0) {
 359                 blkerror(idesc->id_number, "BAD", blkno);
 360                 if (badblk++ >= MAXBAD) {
 361                         pwarn("EXCESSIVE BAD BLKS I=%u",
 362                                 idesc->id_number);
 363                         if (preen)
 364                                 printf(" (SKIPPING)\n");
 365                         else if (reply("CONTINUE") == 0) {
 366                                 ckfini(0);
 367                                 exit(EEXIT);
 368                         }
 369                         return (STOP);
 370                 }
 371         }
 372         for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
 373                 if (anyout && chkrange(blkno, 1)) {
 374                         res = SKIP;
 375                 } else if (!testbmap(blkno)) {
 376                         n_blks++;
 377                         setbmap(blkno);
 378                 } else {
 379                         blkerror(idesc->id_number, "DUP", blkno);
 380                         if (dupblk++ >= MAXDUP) {
 381                                 pwarn("EXCESSIVE DUP BLKS I=%u",
 382                                         idesc->id_number);
 383                                 if (preen)
 384                                         printf(" (SKIPPING)\n");
 385                                 else if (reply("CONTINUE") == 0) {
 386                                         ckfini(0);
 387                                         exit(EEXIT);
 388                                 }
 389                                 return (STOP);
 390                         }
 391                         new = (struct dups *)malloc(sizeof(struct dups));
 392                         if (new == NULL) {
 393                                 pfatal("DUP TABLE OVERFLOW.");
 394                                 if (reply("CONTINUE") == 0) {
 395                                         ckfini(0);
 396                                         exit(EEXIT);
 397                                 }
 398                                 return (STOP);
 399                         }
 400                         new->dup = blkno;
 401                         if (muldup == 0) {
 402                                 duplist = muldup = new;
 403                                 new->next = 0;
 404                         } else {
 405                                 new->next = muldup->next;
 406                                 muldup->next = new;
 407                         }
 408                         for (dlp = duplist; dlp != muldup; dlp = dlp->next)
 409                                 if (dlp->dup == blkno)
 410                                         break;
 411                         if (dlp == muldup && dlp->dup != blkno)
 412                                 muldup = new;
 413                 }
 414                 /*
 415                  * count the number of blocks found in id_entryno
 416                  */
 417                 idesc->id_entryno++;
 418         }
 419         return (res);
 420 }