ffs.c revision 1.15.2.2
1 /* $NetBSD: ffs.c,v 1.15.2.2 2006/11/09 22:51:09 tron 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #if HAVE_NBTOOL_CONFIG_H 40 #include "nbtool_config.h" 41 #endif 42 43 #include <sys/cdefs.h> 44 #if defined(__RCSID) && !defined(__lint) 45 __RCSID("$NetBSD: ffs.c,v 1.15.2.2 2006/11/09 22:51:09 tron Exp $"); 46 #endif /* !__lint */ 47 48 #include <sys/param.h> 49 50 #if !HAVE_NBTOOL_CONFIG_H 51 #include <sys/mount.h> 52 #endif 53 54 #include <assert.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <stdarg.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "installboot.h" 65 66 /* From <dev/raidframe/raidframevar.h> */ 67 #define RF_PROTECTED_SECTORS 64L 68 69 #undef DIRBLKSIZ 70 71 #include <ufs/ufs/dinode.h> 72 #include <ufs/ufs/dir.h> 73 #include <ufs/ffs/fs.h> 74 #include <ufs/ffs/ffs_extern.h> 75 #include <ufs/ufs/ufs_bswap.h> 76 77 static int ffs_match_common(ib_params *, off_t); 78 static int ffs_read_disk_block(ib_params *, uint64_t, int, char *); 79 static int ffs_find_disk_blocks_ufs1(ib_params *, ino_t, 80 int (*)(ib_params *, void *, uint64_t, uint32_t), void *); 81 static int ffs_find_disk_blocks_ufs2(ib_params *, ino_t, 82 int (*)(ib_params *, void *, uint64_t, uint32_t), void *); 83 static int ffs_findstage2_ino(ib_params *, void *, uint64_t, uint32_t); 84 static int ffs_findstage2_blocks(ib_params *, void *, uint64_t, uint32_t); 85 86 static int is_ufs2; 87 88 89 /* This reads a disk block from the filesystem. */ 90 static int 91 ffs_read_disk_block(ib_params *params, uint64_t blkno, int size, char *blk) 92 { 93 int rv; 94 95 assert(params != NULL); 96 assert(blk != NULL); 97 assert(params->filesystem != NULL); 98 assert(params->fsfd != -1); 99 assert(blkno >= 0); 100 assert(size > 0); 101 assert(blk != NULL); 102 103 rv = pread(params->fsfd, blk, size, blkno * DEV_BSIZE); 104 if (rv == -1) { 105 warn("Reading block %llu in `%s'", 106 (unsigned long long)blkno, params->filesystem); 107 return (0); 108 } else if (rv != size) { 109 warnx("Reading block %llu in `%s': short read", 110 (unsigned long long)blkno, params->filesystem); 111 return (0); 112 } 113 114 return (1); 115 } 116 117 /* 118 * This iterates over the data blocks belonging to an inode, 119 * making a callback each iteration with the disk block number 120 * and the size. 121 */ 122 static int 123 ffs_find_disk_blocks_ufs1(ib_params *params, ino_t ino, 124 int (*callback)(ib_params *, void *, uint64_t, uint32_t), 125 void *state) 126 { 127 char sbbuf[SBLOCKSIZE]; 128 struct fs *fs; 129 char inodebuf[MAXBSIZE]; 130 struct ufs1_dinode *inode; 131 int level_i; 132 int32_t blk, lblk, nblk; 133 int rv; 134 #define LEVELS 4 135 struct { 136 int32_t *blknums; 137 unsigned long blkcount; 138 char diskbuf[MAXBSIZE]; 139 } level[LEVELS]; 140 141 assert(params != NULL); 142 assert(params->fstype != NULL); 143 assert(callback != NULL); 144 assert(state != NULL); 145 146 /* Read the superblock. */ 147 if (!ffs_read_disk_block(params, params->fstype->sblockloc, SBLOCKSIZE, 148 sbbuf)) 149 return (0); 150 fs = (struct fs *)sbbuf; 151 if (params->fstype->needswap) 152 ffs_sb_swap(fs, fs); 153 154 if (fs->fs_inopb <= 0) { 155 warnx("Bad inopb %d in superblock in `%s'", 156 fs->fs_inopb, params->filesystem); 157 return (0); 158 } 159 160 /* Read the inode. */ 161 if (! ffs_read_disk_block(params, 162 fsbtodb(fs, ino_to_fsba(fs, ino)) + params->fstype->offset, 163 fs->fs_bsize, inodebuf)) 164 return (0); 165 inode = (struct ufs1_dinode *)inodebuf; 166 inode += ino_to_fsbo(fs, ino); 167 if (params->fstype->needswap) 168 ffs_dinode1_swap(inode, inode); 169 170 /* Get the block count and initialize for our block walk. */ 171 nblk = howmany(inode->di_size, fs->fs_bsize); 172 lblk = 0; 173 level_i = 0; 174 level[0].blknums = &inode->di_db[0]; 175 level[0].blkcount = NDADDR; 176 level[1].blknums = &inode->di_ib[0]; 177 level[1].blkcount = 1; 178 level[2].blknums = &inode->di_ib[1]; 179 level[2].blkcount = 1; 180 level[3].blknums = &inode->di_ib[2]; 181 level[3].blkcount = 1; 182 183 /* Walk the data blocks. */ 184 while (nblk > 0) { 185 186 /* 187 * If there are no more blocks at this indirection 188 * level, move up one indirection level and loop. 189 */ 190 if (level[level_i].blkcount == 0) { 191 if (++level_i == LEVELS) 192 break; 193 continue; 194 } 195 196 /* Get the next block at this level. */ 197 blk = *(level[level_i].blknums++); 198 level[level_i].blkcount--; 199 if (params->fstype->needswap) 200 blk = bswap32(blk); 201 202 #if 0 203 fprintf(stderr, "ino %lu blk %lu level %d\n", ino, blk, 204 level_i); 205 #endif 206 207 /* 208 * If we're not at the direct level, descend one 209 * level, read in that level's new block list, 210 * and loop. 211 */ 212 if (level_i > 0) { 213 level_i--; 214 if (blk == 0) 215 memset(level[level_i].diskbuf, 0, MAXBSIZE); 216 else if (! ffs_read_disk_block(params, 217 fsbtodb(fs, blk) + params->fstype->offset, 218 fs->fs_bsize, level[level_i].diskbuf)) 219 return (0); 220 /* XXX ondisk32 */ 221 level[level_i].blknums = 222 (int32_t *)level[level_i].diskbuf; 223 level[level_i].blkcount = NINDIR(fs); 224 continue; 225 } 226 227 /* blk is the next direct level block. */ 228 #if 0 229 fprintf(stderr, "ino %lu db %lu blksize %lu\n", ino, 230 fsbtodb(fs, blk), sblksize(fs, inode->di_size, lblk)); 231 #endif 232 rv = (*callback)(params, state, 233 fsbtodb(fs, blk) + params->fstype->offset, 234 sblksize(fs, inode->di_size, lblk)); 235 lblk++; 236 nblk--; 237 if (rv != 1) 238 return (rv); 239 } 240 241 if (nblk != 0) { 242 warnx("Inode %d in `%s' ran out of blocks?", ino, 243 params->filesystem); 244 return (0); 245 } 246 247 return (1); 248 } 249 250 /* 251 * This iterates over the data blocks belonging to an inode, 252 * making a callback each iteration with the disk block number 253 * and the size. 254 */ 255 static int 256 ffs_find_disk_blocks_ufs2(ib_params *params, ino_t ino, 257 int (*callback)(ib_params *, void *, uint64_t, uint32_t), 258 void *state) 259 { 260 char sbbuf[SBLOCKSIZE]; 261 struct fs *fs; 262 char inodebuf[MAXBSIZE]; 263 struct ufs2_dinode *inode; 264 int level_i; 265 int64_t blk, lblk, nblk; 266 int rv; 267 #define LEVELS 4 268 struct { 269 int64_t *blknums; 270 unsigned long blkcount; 271 char diskbuf[MAXBSIZE]; 272 } level[LEVELS]; 273 274 assert(params != NULL); 275 assert(params->fstype != NULL); 276 assert(callback != NULL); 277 assert(state != NULL); 278 279 /* Read the superblock. */ 280 if (!ffs_read_disk_block(params, params->fstype->sblockloc, SBLOCKSIZE, 281 sbbuf)) 282 return (0); 283 fs = (struct fs *)sbbuf; 284 if (params->fstype->needswap) 285 ffs_sb_swap(fs, fs); 286 287 if (fs->fs_inopb <= 0) { 288 warnx("Bad inopb %d in superblock in `%s'", 289 fs->fs_inopb, params->filesystem); 290 return (0); 291 } 292 293 /* Read the inode. */ 294 if (! ffs_read_disk_block(params, fsbtodb(fs, ino_to_fsba(fs, ino)), 295 fs->fs_bsize, inodebuf)) 296 return (0); 297 inode = (struct ufs2_dinode *)inodebuf; 298 inode += ino_to_fsbo(fs, ino); 299 if (params->fstype->needswap) 300 ffs_dinode2_swap(inode, inode); 301 302 /* Get the block count and initialize for our block walk. */ 303 nblk = howmany(inode->di_size, fs->fs_bsize); 304 lblk = 0; 305 level_i = 0; 306 level[0].blknums = &inode->di_db[0]; 307 level[0].blkcount = NDADDR; 308 level[1].blknums = &inode->di_ib[0]; 309 level[1].blkcount = 1; 310 level[2].blknums = &inode->di_ib[1]; 311 level[2].blkcount = 1; 312 level[3].blknums = &inode->di_ib[2]; 313 level[3].blkcount = 1; 314 315 /* Walk the data blocks. */ 316 while (nblk > 0) { 317 318 /* 319 * If there are no more blocks at this indirection 320 * level, move up one indirection level and loop. 321 */ 322 if (level[level_i].blkcount == 0) { 323 if (++level_i == LEVELS) 324 break; 325 continue; 326 } 327 328 /* Get the next block at this level. */ 329 blk = *(level[level_i].blknums++); 330 level[level_i].blkcount--; 331 if (params->fstype->needswap) 332 blk = bswap64(blk); 333 334 #if 0 335 fprintf(stderr, "ino %lu blk %llu level %d\n", ino, 336 (unsigned long long)blk, level_i); 337 #endif 338 339 /* 340 * If we're not at the direct level, descend one 341 * level, read in that level's new block list, 342 * and loop. 343 */ 344 if (level_i > 0) { 345 level_i--; 346 if (blk == 0) 347 memset(level[level_i].diskbuf, 0, MAXBSIZE); 348 else if (! ffs_read_disk_block(params, 349 fsbtodb(fs, blk), 350 fs->fs_bsize, level[level_i].diskbuf)) 351 return (0); 352 level[level_i].blknums = 353 (int64_t *)level[level_i].diskbuf; 354 level[level_i].blkcount = NINDIR(fs); 355 continue; 356 } 357 358 /* blk is the next direct level block. */ 359 #if 0 360 fprintf(stderr, "ino %lu db %llu blksize %lu\n", ino, 361 fsbtodb(fs, blk), sblksize(fs, inode->di_size, lblk)); 362 #endif 363 rv = (*callback)(params, state, 364 fsbtodb(fs, blk), sblksize(fs, inode->di_size, lblk)); 365 lblk++; 366 nblk--; 367 if (rv != 1) 368 return (rv); 369 } 370 371 if (nblk != 0) { 372 warnx("Inode %d in `%s' ran out of blocks?", ino, 373 params->filesystem); 374 return (0); 375 } 376 377 return (1); 378 } 379 380 /* 381 * This callback reads a block of the root directory, 382 * searches for an entry for the secondary bootstrap, 383 * and saves the inode number if one is found. 384 */ 385 static int 386 ffs_findstage2_ino(ib_params *params, void *_ino, 387 uint64_t blk, uint32_t blksize) 388 { 389 char dirbuf[MAXBSIZE]; 390 struct direct *de, *ede; 391 uint32_t ino; 392 393 assert(params != NULL); 394 assert(params->fstype != NULL); 395 assert(params->stage2 != NULL); 396 assert(_ino != NULL); 397 398 /* Skip directory holes. */ 399 if (blk == 0) 400 return (1); 401 402 /* Read the directory block. */ 403 if (! ffs_read_disk_block(params, blk, blksize, dirbuf)) 404 return (0); 405 406 /* Loop over the directory entries. */ 407 de = (struct direct *)&dirbuf[0]; 408 ede = (struct direct *)&dirbuf[blksize]; 409 while (de < ede) { 410 ino = de->d_ino; 411 if (params->fstype->needswap) { 412 ino = bswap32(ino); 413 de->d_reclen = bswap16(de->d_reclen); 414 } 415 if (ino != 0 && strcmp(de->d_name, params->stage2) == 0) { 416 *((uint32_t *)_ino) = ino; 417 return (2); 418 } 419 if (de->d_reclen == 0) 420 break; 421 de = (struct direct *)((char *)de + de->d_reclen); 422 } 423 424 return (1); 425 } 426 427 struct findblks_state { 428 uint32_t maxblk; 429 uint32_t nblk; 430 ib_block *blocks; 431 }; 432 433 /* This callback records the blocks of the secondary bootstrap. */ 434 static int 435 ffs_findstage2_blocks(ib_params *params, void *_state, 436 uint64_t blk, uint32_t blksize) 437 { 438 struct findblks_state *state = _state; 439 440 assert(params != NULL); 441 assert(params->stage2 != NULL); 442 assert(_state != NULL); 443 444 if (state->nblk == state->maxblk) { 445 warnx("Secondary bootstrap `%s' has too many blocks (max %d)", 446 params->stage2, state->maxblk); 447 return (0); 448 } 449 state->blocks[state->nblk].block = blk; 450 state->blocks[state->nblk].blocksize = blksize; 451 state->nblk++; 452 return (1); 453 } 454 455 /* 456 * publicly visible functions 457 */ 458 459 static off_t sblock_try[] = SBLOCKSEARCH; 460 461 int 462 ffs_match(ib_params *params) 463 { 464 return ffs_match_common(params, (off_t) 0); 465 } 466 467 int 468 raid_match(ib_params *params) 469 { 470 /* XXX Assumes 512 bytes / sector */ 471 if (DEV_BSIZE != 512) { 472 warnx("Media is %d bytes/sector." 473 " RAID is only supported on 512 bytes/sector media.", 474 DEV_BSIZE); 475 return 0; 476 } 477 return ffs_match_common(params, (off_t) RF_PROTECTED_SECTORS); 478 } 479 480 int 481 ffs_match_common(ib_params *params, off_t offset) 482 { 483 char sbbuf[SBLOCKSIZE]; 484 struct fs *fs; 485 int i; 486 off_t loc; 487 488 assert(params != NULL); 489 assert(params->fstype != NULL); 490 491 fs = (struct fs *)sbbuf; 492 for (i = 0; sblock_try[i] != -1; i++) { 493 loc = sblock_try[i] / DEV_BSIZE + offset; 494 if (!ffs_read_disk_block(params, loc, SBLOCKSIZE, sbbuf)) 495 continue; 496 switch (fs->fs_magic) { 497 case FS_UFS2_MAGIC: 498 is_ufs2 = 1; 499 /* FALLTHROUGH */ 500 case FS_UFS1_MAGIC: 501 params->fstype->needswap = 0; 502 params->fstype->blocksize = fs->fs_bsize; 503 params->fstype->sblockloc = loc; 504 params->fstype->offset = offset; 505 break; 506 case FS_UFS2_MAGIC_SWAPPED: 507 is_ufs2 = 1; 508 /* FALLTHROUGH */ 509 case FS_UFS1_MAGIC_SWAPPED: 510 params->fstype->needswap = 1; 511 params->fstype->blocksize = bswap32(fs->fs_bsize); 512 params->fstype->sblockloc = loc; 513 params->fstype->offset = offset; 514 break; 515 default: 516 continue; 517 } 518 if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2) 519 continue; 520 return 1; 521 } 522 523 return (0); 524 } 525 526 int 527 ffs_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks) 528 { 529 int rv; 530 uint32_t ino; 531 struct findblks_state state; 532 533 assert(params != NULL); 534 assert(params->stage2 != NULL); 535 assert(maxblk != NULL); 536 assert(blocks != NULL); 537 538 if (params->flags & IB_STAGE2START) 539 return (hardcode_stage2(params, maxblk, blocks)); 540 541 /* The secondary bootstrap must be clearly in /. */ 542 if (params->stage2[0] == '/') 543 params->stage2++; 544 if (strchr(params->stage2, '/') != NULL) { 545 warnx("The secondary bootstrap `%s' must be in /", 546 params->stage2); 547 return (0); 548 } 549 550 /* Get the inode number of the secondary bootstrap. */ 551 if (is_ufs2) 552 rv = ffs_find_disk_blocks_ufs2(params, ROOTINO, 553 ffs_findstage2_ino, &ino); 554 else 555 rv = ffs_find_disk_blocks_ufs1(params, ROOTINO, 556 ffs_findstage2_ino, &ino); 557 if (rv != 2) { 558 warnx("Could not find secondary bootstrap `%s' in `%s'", 559 params->stage2, params->filesystem); 560 return (0); 561 } 562 563 /* Record the disk blocks of the secondary bootstrap. */ 564 state.maxblk = *maxblk; 565 state.nblk = 0; 566 state.blocks = blocks; 567 if (is_ufs2) 568 rv = ffs_find_disk_blocks_ufs2(params, ino, 569 ffs_findstage2_blocks, &state); 570 else 571 rv = ffs_find_disk_blocks_ufs1(params, ino, 572 ffs_findstage2_blocks, &state); 573 if (! rv) { 574 return (0); 575 } 576 577 *maxblk = state.nblk; 578 return (1); 579 } 580
Indexes created Wed Oct 01 19:09:53 GMT 2025