usr.sbin/installboot/ffs.c

   1 /*      $NetBSD: ffs.c,v 1.26 2008/10/12 16:03:27 apb Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Matt Fredette.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if defined(__RCSID) && !defined(__lint)
  38 __RCSID("$NetBSD: ffs.c,v 1.26 2008/10/12 16:03:27 apb Exp $");
  39 #endif  /* !__lint */
  40
  41 #include <sys/param.h>
  42
  43 #if !HAVE_NBTOOL_CONFIG_H
  44 #include <sys/mount.h>
  45 #endif
  46
  47 #include <assert.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <stdarg.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56
  57 #include "installboot.h"
  58
  59 /* From <dev/raidframe/raidframevar.h> */
  60 #define RF_PROTECTED_SECTORS 64L
  61
  62 #undef DIRBLKSIZ
  63
  64 #include <ufs/ufs/dinode.h>
  65 #include <ufs/ufs/dir.h>
  66 #include <ufs/ffs/fs.h>
  67 #include <ufs/ffs/ffs_extern.h>
  68 #ifndef NO_FFS_SWAP
  69 #include <ufs/ufs/ufs_bswap.h>
  70 #else
  71 #define ffs_sb_swap(fs_a, fs_b)
  72 #define ffs_dinode1_swap(inode_a, inode_b)
  73 #define ffs_dinode2_swap(inode_a, inode_b)
  74 #endif
  75
  76 static int      ffs_match_common(ib_params *, off_t);
  77 static int      ffs_read_disk_block(ib_params *, uint64_t, int, char []);
  78 static int      ffs_find_disk_blocks_ufs1(ib_params *, ino_t,
  79                     int (*)(ib_params *, void *, uint64_t, uint32_t), void *);
  80 static int      ffs_find_disk_blocks_ufs2(ib_params *, ino_t,
  81                     int (*)(ib_params *, void *, uint64_t, uint32_t), void *);
  82 static int      ffs_findstage2_ino(ib_params *, void *, uint64_t, uint32_t);
  83 static int      ffs_findstage2_blocks(ib_params *, void *, uint64_t, uint32_t);
  84
  85 static int is_ufs2;
  86
  87
  88 /* This reads a disk block from the filesystem. */
  89 static int
  90 ffs_read_disk_block(ib_params *params, uint64_t blkno, int size, char blk[])
  91 {
  92         int     rv;
  93
  94         assert(params != NULL);
  95         assert(params->filesystem != NULL);
  96         assert(params->fsfd != -1);
  97         assert(size > 0);
  98         assert(blk != NULL);
  99
 100         rv = pread(params->fsfd, blk, size, blkno * DEV_BSIZE);
 101         if (rv == -1) {
 102                 warn("Reading block %llu in `%s'",
 103                     (unsigned long long)blkno, params->filesystem);
 104                 return (0);
 105         } else if (rv != size) {
 106                 warnx("Reading block %llu in `%s': short read",
 107                     (unsigned long long)blkno, params->filesystem);
 108                 return (0);
 109         }
 110
 111         return (1);
 112 }
 113
 114 /*
 115  * This iterates over the data blocks belonging to an inode,
 116  * making a callback each iteration with the disk block number
 117  * and the size.
 118  */
 119 static int
 120 ffs_find_disk_blocks_ufs1(ib_params *params, ino_t ino,
 121         int (*callback)(ib_params *, void *, uint64_t, uint32_t),
 122         void *state)
 123 {
 124         char            sbbuf[SBLOCKSIZE];
 125         struct fs       *fs;
 126         char            inodebuf[MAXBSIZE];
 127         struct ufs1_dinode      *inode;
 128         int             level_i;
 129         int32_t blk, lblk, nblk;
 130         int             rv;
 131 #define LEVELS 4
 132         struct {
 133                 int32_t         *blknums;
 134                 unsigned long   blkcount;
 135                 char            diskbuf[MAXBSIZE];
 136         } level[LEVELS];
 137
 138         assert(params != NULL);
 139         assert(params->fstype != NULL);
 140         assert(callback != NULL);
 141         assert(state != NULL);
 142
 143         /* Read the superblock. */
 144         if (!ffs_read_disk_block(params, params->fstype->sblockloc, SBLOCKSIZE,
 145             sbbuf))
 146                 return (0);
 147         fs = (struct fs *)sbbuf;
 148 #ifndef NO_FFS_SWAP
 149         if (params->fstype->needswap)
 150                 ffs_sb_swap(fs, fs);
 151 #endif
 152
 153         if (fs->fs_inopb <= 0) {
 154                 warnx("Bad inopb %d in superblock in `%s'",
 155                     fs->fs_inopb, params->filesystem);
 156                 return (0);
 157         }
 158
 159         /* Read the inode. */
 160         if (! ffs_read_disk_block(params,
 161                 fsbtodb(fs, ino_to_fsba(fs, ino)) + params->fstype->offset,
 162                 fs->fs_bsize, inodebuf))
 163                 return (0);
 164         inode = (struct ufs1_dinode *)inodebuf;
 165         inode += ino_to_fsbo(fs, ino);
 166 #ifndef NO_FFS_SWAP
 167         if (params->fstype->needswap)
 168                 ffs_dinode1_swap(inode, inode);
 169 #endif
 170
 171         /* Get the block count and initialize for our block walk. */
 172         nblk = howmany(inode->di_size, fs->fs_bsize);
 173         lblk = 0;
 174         level_i = 0;
 175         level[0].blknums = &inode->di_db[0];
 176         level[0].blkcount = NDADDR;
 177         level[1].blknums = &inode->di_ib[0];
 178         level[1].blkcount = 1;
 179         level[2].blknums = &inode->di_ib[1];
 180         level[2].blkcount = 1;
 181         level[3].blknums = &inode->di_ib[2];
 182         level[3].blkcount = 1;
 183
 184         /* Walk the data blocks. */
 185         while (nblk > 0) {
 186
 187                 /*
 188                  * If there are no more blocks at this indirection
 189                  * level, move up one indirection level and loop.
 190                  */
 191                 if (level[level_i].blkcount == 0) {
 192                         if (++level_i == LEVELS)
 193                                 break;
 194                         continue;
 195                 }
 196
 197                 /* Get the next block at this level. */
 198                 blk = *(level[level_i].blknums++);
 199                 level[level_i].blkcount--;
 200                 if (params->fstype->needswap)
 201                         blk = bswap32(blk);
 202
 203 #if 0
 204                 fprintf(stderr, "ino %lu blk %lu level %d\n", ino, blk,
 205                     level_i);
 206 #endif
 207
 208                 /*
 209                  * If we're not at the direct level, descend one
 210                  * level, read in that level's new block list,
 211                  * and loop.
 212                  */
 213                 if (level_i > 0) {
 214                         level_i--;
 215                         if (blk == 0)
 216                                 memset(level[level_i].diskbuf, 0, MAXBSIZE);
 217                         else if (! ffs_read_disk_block(params,
 218                                 fsbtodb(fs, blk) + params->fstype->offset,
 219                                 fs->fs_bsize, level[level_i].diskbuf))
 220                                 return (0);
 221                         /* XXX ondisk32 */
 222                         level[level_i].blknums =
 223                                 (int32_t *)level[level_i].diskbuf;
 224                         level[level_i].blkcount = NINDIR(fs);
 225                         continue;
 226                 }
 227
 228                 /* blk is the next direct level block. */
 229 #if 0
 230                 fprintf(stderr, "ino %lu db %lu blksize %lu\n", ino,
 231                     fsbtodb(fs, blk), sblksize(fs, inode->di_size, lblk));
 232 #endif
 233                 rv = (*callback)(params, state,
 234                     fsbtodb(fs, blk) + params->fstype->offset,
 235                     sblksize(fs, (int64_t)inode->di_size, lblk));
 236                 lblk++;
 237                 nblk--;
 238                 if (rv != 1)
 239                         return (rv);
 240         }
 241
 242         if (nblk != 0) {
 243                 warnx("Inode %llu in `%s' ran out of blocks?",
 244                     (unsigned long long)ino, params->filesystem);
 245                 return (0);
 246         }
 247
 248         return (1);
 249 }
 250
 251 /*
 252  * This iterates over the data blocks belonging to an inode,
 253  * making a callback each iteration with the disk block number
 254  * and the size.
 255  */
 256 static int
 257 ffs_find_disk_blocks_ufs2(ib_params *params, ino_t ino,
 258         int (*callback)(ib_params *, void *, uint64_t, uint32_t),
 259         void *state)
 260 {
 261         char            sbbuf[SBLOCKSIZE];
 262         struct fs       *fs;
 263         char            inodebuf[MAXBSIZE];
 264         struct ufs2_dinode      *inode;
 265         int             level_i;
 266         int64_t         blk, lblk, nblk;
 267         int             rv;
 268 #define LEVELS 4
 269         struct {
 270                 int64_t         *blknums;
 271                 unsigned long   blkcount;
 272                 char            diskbuf[MAXBSIZE];
 273         } level[LEVELS];
 274
 275         assert(params != NULL);
 276         assert(params->fstype != NULL);
 277         assert(callback != NULL);
 278         assert(state != NULL);
 279
 280         /* Read the superblock. */
 281         if (!ffs_read_disk_block(params, params->fstype->sblockloc, SBLOCKSIZE,
 282             sbbuf))
 283                 return (0);
 284         fs = (struct fs *)sbbuf;
 285 #ifndef NO_FFS_SWAP
 286         if (params->fstype->needswap)
 287                 ffs_sb_swap(fs, fs);
 288 #endif
 289
 290         if (fs->fs_inopb <= 0) {
 291                 warnx("Bad inopb %d in superblock in `%s'",
 292                     fs->fs_inopb, params->filesystem);
 293                 return (0);
 294         }
 295
 296         /* Read the inode. */
 297         if (! ffs_read_disk_block(params,
 298                 fsbtodb(fs, ino_to_fsba(fs, ino)) + params->fstype->offset,
 299                 fs->fs_bsize, inodebuf))
 300                 return (0);
 301         inode = (struct ufs2_dinode *)inodebuf;
 302         inode += ino_to_fsbo(fs, ino);
 303 #ifndef NO_FFS_SWAP
 304         if (params->fstype->needswap)
 305                 ffs_dinode2_swap(inode, inode);
 306 #endif
 307
 308         /* Get the block count and initialize for our block walk. */
 309         nblk = howmany(inode->di_size, fs->fs_bsize);
 310         lblk = 0;
 311         level_i = 0;
 312         level[0].blknums = &inode->di_db[0];
 313         level[0].blkcount = NDADDR;
 314         level[1].blknums = &inode->di_ib[0];
 315         level[1].blkcount = 1;
 316         level[2].blknums = &inode->di_ib[1];
 317         level[2].blkcount = 1;
 318         level[3].blknums = &inode->di_ib[2];
 319         level[3].blkcount = 1;
 320
 321         /* Walk the data blocks. */
 322         while (nblk > 0) {
 323
 324                 /*
 325                  * If there are no more blocks at this indirection
 326                  * level, move up one indirection level and loop.
 327                  */
 328                 if (level[level_i].blkcount == 0) {
 329                         if (++level_i == LEVELS)
 330                                 break;
 331                         continue;
 332                 }
 333
 334                 /* Get the next block at this level. */
 335                 blk = *(level[level_i].blknums++);
 336                 level[level_i].blkcount--;
 337                 if (params->fstype->needswap)
 338                         blk = bswap64(blk);
 339
 340 #if 0
 341                 fprintf(stderr, "ino %lu blk %llu level %d\n", ino,
 342                     (unsigned long long)blk, level_i);
 343 #endif
 344
 345                 /*
 346                  * If we're not at the direct level, descend one
 347                  * level, read in that level's new block list,
 348                  * and loop.
 349                  */
 350                 if (level_i > 0) {
 351                         level_i--;
 352                         if (blk == 0)
 353                                 memset(level[level_i].diskbuf, 0, MAXBSIZE);
 354                         else if (! ffs_read_disk_block(params,
 355                                 fsbtodb(fs, blk) + params->fstype->offset,
 356                                 fs->fs_bsize, level[level_i].diskbuf))
 357                                 return (0);
 358                         level[level_i].blknums =
 359                                 (int64_t *)level[level_i].diskbuf;
 360                         level[level_i].blkcount = NINDIR(fs);
 361                         continue;
 362                 }
 363
 364                 /* blk is the next direct level block. */
 365 #if 0
 366                 fprintf(stderr, "ino %lu db %llu blksize %lu\n", ino,
 367                     fsbtodb(fs, blk), sblksize(fs, inode->di_size, lblk));
 368 #endif
 369                 rv = (*callback)(params, state,
 370                     fsbtodb(fs, blk) + params->fstype->offset,
 371                     sblksize(fs, (int64_t)inode->di_size, lblk));
 372                 lblk++;
 373                 nblk--;
 374                 if (rv != 1)
 375                         return (rv);
 376         }
 377
 378         if (nblk != 0) {
 379                 warnx("Inode %llu in `%s' ran out of blocks?",
 380                     (unsigned long long)ino, params->filesystem);
 381                 return (0);
 382         }
 383
 384         return (1);
 385 }
 386
 387 /*
 388  * This callback reads a block of the root directory,
 389  * searches for an entry for the secondary bootstrap,
 390  * and saves the inode number if one is found.
 391  */
 392 static int
 393 ffs_findstage2_ino(ib_params *params, void *_ino,
 394         uint64_t blk, uint32_t blksize)
 395 {
 396         char            dirbuf[MAXBSIZE];
 397         struct direct   *de, *ede;
 398         uint32_t        ino;
 399
 400         assert(params != NULL);
 401         assert(params->fstype != NULL);
 402         assert(params->stage2 != NULL);
 403         assert(_ino != NULL);
 404
 405         /* Skip directory holes. */
 406         if (blk == 0)
 407                 return (1);
 408
 409         /* Read the directory block. */
 410         if (! ffs_read_disk_block(params, blk, blksize, dirbuf))
 411                 return (0);
 412
 413         /* Loop over the directory entries. */
 414         de = (struct direct *)&dirbuf[0];
 415         ede = (struct direct *)&dirbuf[blksize];
 416         while (de < ede) {
 417                 ino = de->d_fileno;
 418                 if (params->fstype->needswap) {
 419                         ino = bswap32(ino);
 420                         de->d_reclen = bswap16(de->d_reclen);
 421                 }
 422                 if (ino != 0 && strcmp(de->d_name, params->stage2) == 0) {
 423                         *((uint32_t *)_ino) = ino;
 424                         return (2);
 425                 }
 426                 if (de->d_reclen == 0)
 427                         break;
 428                 de = (struct direct *)((char *)de + de->d_reclen);
 429         }
 430
 431         return (1);
 432 }
 433
 434 struct findblks_state {
 435         uint32_t        maxblk;
 436         uint32_t        nblk;
 437         ib_block        *blocks;
 438 };
 439
 440 /* This callback records the blocks of the secondary bootstrap. */
 441 static int
 442 ffs_findstage2_blocks(ib_params *params, void *_state,
 443         uint64_t blk, uint32_t blksize)
 444 {
 445         struct findblks_state *state = _state;
 446
 447         assert(params != NULL);
 448         assert(params->stage2 != NULL);
 449         assert(_state != NULL);
 450
 451         if (state->nblk == state->maxblk) {
 452                 warnx("Secondary bootstrap `%s' has too many blocks (max %d)",
 453                     params->stage2, state->maxblk);
 454                 return (0);
 455         }
 456         state->blocks[state->nblk].block = blk;
 457         state->blocks[state->nblk].blocksize = blksize;
 458         state->nblk++;
 459         return (1);
 460 }
 461
 462 /*
 463  *      publicly visible functions
 464  */
 465
 466 static off_t sblock_try[] = SBLOCKSEARCH;
 467
 468 int
 469 ffs_match(ib_params *params)
 470 {
 471         return ffs_match_common(params, (off_t) 0);
 472 }
 473
 474 int
 475 raid_match(ib_params *params)
 476 {
 477         /* XXX Assumes 512 bytes / sector */
 478         if (DEV_BSIZE != 512) {
 479                 warnx("Media is %d bytes/sector."
 480                         "  RAID is only supported on 512 bytes/sector media.",
 481                         DEV_BSIZE);
 482                 return 0;
 483         }
 484         return ffs_match_common(params, (off_t) RF_PROTECTED_SECTORS);
 485 }
 486
 487 int
 488 ffs_match_common(ib_params *params, off_t offset)
 489 {
 490         char            sbbuf[SBLOCKSIZE];
 491         struct fs       *fs;
 492         int i;
 493         off_t loc;
 494
 495         assert(params != NULL);
 496         assert(params->fstype != NULL);
 497
 498         fs = (struct fs *)sbbuf;
 499         for (i = 0; sblock_try[i] != -1; i++) {
 500                 loc = sblock_try[i] / DEV_BSIZE + offset;
 501                 if (!ffs_read_disk_block(params, loc, SBLOCKSIZE, sbbuf))
 502                         continue;
 503                 switch (fs->fs_magic) {
 504                 case FS_UFS2_MAGIC:
 505                         is_ufs2 = 1;
 506                         /* FALLTHROUGH */
 507                 case FS_UFS1_MAGIC:
 508                         params->fstype->needswap = 0;
 509                         params->fstype->blocksize = fs->fs_bsize;
 510                         params->fstype->sblockloc = loc;
 511                         params->fstype->offset = offset;
 512                         break;
 513 #ifndef FFS_NO_SWAP
 514                 case FS_UFS2_MAGIC_SWAPPED:
 515                         is_ufs2 = 1;
 516                         /* FALLTHROUGH */
 517                 case FS_UFS1_MAGIC_SWAPPED:
 518                         params->fstype->needswap = 1;
 519                         params->fstype->blocksize = bswap32(fs->fs_bsize);
 520                         params->fstype->sblockloc = loc;
 521                         params->fstype->offset = offset;
 522                         break;
 523 #endif
 524                 default:
 525                         continue;
 526                 }
 527                 if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2)
 528                         continue;
 529                 return 1;
 530         }
 531
 532         return (0);
 533 }
 534
 535 int
 536 ffs_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks)
 537 {
 538         int                     rv;
 539         uint32_t                ino;
 540         struct findblks_state   state;
 541
 542         assert(params != NULL);
 543         assert(params->stage2 != NULL);
 544         assert(maxblk != NULL);
 545         assert(blocks != NULL);
 546
 547         if (params->flags & IB_STAGE2START)
 548                 return (hardcode_stage2(params, maxblk, blocks));
 549
 550         /* The secondary bootstrap must be clearly in /. */
 551         if (params->stage2[0] == '/')
 552                 params->stage2++;
 553         if (strchr(params->stage2, '/') != NULL) {
 554                 warnx("The secondary bootstrap `%s' must be in /",
 555                     params->stage2);
 556                 warnx("(Path must be relative to the file system in `%s')",
 557                     params->filesystem);
 558                 return (0);
 559         }
 560
 561         /* Get the inode number of the secondary bootstrap. */
 562         if (is_ufs2)
 563                 rv = ffs_find_disk_blocks_ufs2(params, ROOTINO,
 564                     ffs_findstage2_ino, &ino);
 565         else
 566                 rv = ffs_find_disk_blocks_ufs1(params, ROOTINO,
 567                     ffs_findstage2_ino, &ino);
 568         if (rv != 2) {
 569                 warnx("Could not find secondary bootstrap `%s' in `%s'",
 570                     params->stage2, params->filesystem);
 571                 warnx("(Path must be relative to the file system in `%s')",
 572                     params->filesystem);
 573                 return (0);
 574         }
 575
 576         /* Record the disk blocks of the secondary bootstrap. */
 577         state.maxblk = *maxblk;
 578         state.nblk = 0;
 579         state.blocks = blocks;
 580         if (is_ufs2)
 581                 rv = ffs_find_disk_blocks_ufs2(params, ino,
 582                     ffs_findstage2_blocks, &state);
 583         else
 584                 rv = ffs_find_disk_blocks_ufs1(params, ino,
 585                     ffs_findstage2_blocks, &state);
 586         if (! rv) {
 587                 return (0);
 588         }
 589
 590         *maxblk = state.nblk;
 591         return (1);
 592 }