1 /* 2 * GRUB -- GRand Unified Bootloader 3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 /* 20 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 21 * Use is subject to license terms. 22 */ 23 #pragma ident "%Z%%M% %I% %E% SMI" 24 25 /* 26 * The zfs plug-in routines for GRUB are: 27 * 28 * zfs_mount() - locates a valid uberblock of the root pool and reads 29 * in its MOS at the memory address MOS. 30 * 31 * zfs_open() - locates a plain file object by following the MOS 32 * and places its dnode at the memory address DNODE. 33 * 34 * zfs_read() - read in the data blocks pointed by the DNODE. 35 * 36 * ZFS_SCRATCH is used as a working area. 37 * 38 * (memory addr) MOS DNODE ZFS_SCRATCH 39 * | | | 40 * +-------V---------V----------V---------------+ 41 * memory | | dnode | dnode | scratch | 42 * | | 512B | 512B | area | 43 * +--------------------------------------------+ 44 */ 45 46 #ifdef FSYS_ZFS 47 48 #include "shared.h" 49 #include "filesys.h" 50 #include "fsys_zfs.h" 51 52 /* cache for a file block of the currently zfs_open()-ed file */ 53 static void *file_buf = NULL; 54 static uint64_t file_start = 0; 55 static uint64_t file_end = 0; 56 57 /* cache for a dnode block */ 58 static dnode_phys_t *dnode_buf = NULL; 59 static dnode_phys_t *dnode_mdn = NULL; 60 static uint64_t dnode_start = 0; 61 static uint64_t dnode_end = 0; 62 63 static uberblock_t current_uberblock; 64 65 static char *stackbase; 66 67 decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = 68 { 69 {"inherit", 0}, /* ZIO_COMPRESS_INHERIT */ 70 {"on", lzjb_decompress}, /* ZIO_COMPRESS_ON */ 71 {"off", 0}, /* ZIO_COMPRESS_OFF */ 72 {"lzjb", lzjb_decompress}, /* ZIO_COMPRESS_LZJB */ 73 {"empty", 0} /* ZIO_COMPRESS_EMPTY */ 74 }; 75 76 /* 77 * Our own version of bcmp(). 78 */ 79 static int 80 zfs_bcmp(const void *s1, const void *s2, size_t n) 81 { 82 const uchar_t *ps1 = s1; 83 const uchar_t *ps2 = s2; 84 85 if (s1 != s2 && n != 0) { 86 do { 87 if (*ps1++ != *ps2++) 88 return (1); 89 } while (--n != 0); 90 } 91 92 return (0); 93 } 94 95 /* 96 * Our own version of log2(). Same thing as highbit()-1. 97 */ 98 static int 99 zfs_log2(uint64_t num) 100 { 101 int i = 0; 102 103 while (num > 1) { 104 i++; 105 num = num >> 1; 106 } 107 108 return (i); 109 } 110 111 /* Checksum Functions */ 112 static void 113 zio_checksum_off(const void *buf, uint64_t size, zio_cksum_t *zcp) 114 { 115 ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0); 116 } 117 118 /* Checksum Table and Values */ 119 zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = { 120 NULL, NULL, 0, 0, "inherit", 121 NULL, NULL, 0, 0, "on", 122 zio_checksum_off, zio_checksum_off, 0, 0, "off", 123 zio_checksum_SHA256, zio_checksum_SHA256, 1, 1, "label", 124 zio_checksum_SHA256, zio_checksum_SHA256, 1, 1, "gang_header", 125 fletcher_2_native, fletcher_2_byteswap, 0, 1, "zilog", 126 fletcher_2_native, fletcher_2_byteswap, 0, 0, "fletcher2", 127 fletcher_4_native, fletcher_4_byteswap, 1, 0, "fletcher4", 128 zio_checksum_SHA256, zio_checksum_SHA256, 1, 0, "SHA256", 129 }; 130 131 /* 132 * zio_checksum_verify: Provides support for checksum verification. 133 * 134 * Fletcher2, Fletcher4, and SHA256 are supported. 135 * 136 * Return: 137 * -1 = Failure 138 * 0 = Success 139 */ 140 static int 141 zio_checksum_verify(blkptr_t *bp, char *data, int size) 142 { 143 zio_cksum_t zc = bp->blk_cksum; 144 uint32_t checksum = BP_IS_GANG(bp) ? ZIO_CHECKSUM_GANG_HEADER : 145 BP_GET_CHECKSUM(bp); 146 int byteswap = BP_SHOULD_BYTESWAP(bp); 147 zio_block_tail_t *zbt = (zio_block_tail_t *)(data + size) - 1; 148 zio_checksum_info_t *ci = &zio_checksum_table[checksum]; 149 zio_cksum_t actual_cksum, expected_cksum; 150 151 /* byteswap is not supported */ 152 if (byteswap) 153 return (-1); 154 155 if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL) 156 return (-1); 157 158 if (ci->ci_zbt) { 159 if (checksum == ZIO_CHECKSUM_GANG_HEADER) { 160 /* 161 * 'gang blocks' is not supported. 162 */ 163 return (-1); 164 } 165 166 if (zbt->zbt_magic == BSWAP_64(ZBT_MAGIC)) { 167 /* byte swapping is not supported */ 168 return (-1); 169 } else { 170 expected_cksum = zbt->zbt_cksum; 171 zbt->zbt_cksum = zc; 172 ci->ci_func[0](data, size, &actual_cksum); 173 zbt->zbt_cksum = expected_cksum; 174 } 175 zc = expected_cksum; 176 177 } else { 178 if (BP_IS_GANG(bp)) 179 return (-1); 180 ci->ci_func[byteswap](data, size, &actual_cksum); 181 } 182 183 if ((actual_cksum.zc_word[0] - zc.zc_word[0]) | 184 (actual_cksum.zc_word[1] - zc.zc_word[1]) | 185 (actual_cksum.zc_word[2] - zc.zc_word[2]) | 186 (actual_cksum.zc_word[3] - zc.zc_word[3])) 187 return (-1); 188 189 return (0); 190 } 191 192 /* 193 * vdev_label_offset takes "offset" (the offset within a vdev_label) and 194 * returns its physical disk offset (starting from the beginning of the vdev). 195 * 196 * Input: 197 * psize : Physical size of this vdev 198 * l : Label Number (0-3) 199 * offset : The offset with a vdev_label in which we want the physical 200 * address 201 * Return: 202 * Success : physical disk offset 203 * Failure : errnum = ERR_BAD_ARGUMENT, return value is meaningless 204 */ 205 static uint64_t 206 vdev_label_offset(uint64_t psize, int l, uint64_t offset) 207 { 208 /* XXX Need to add back label support! */ 209 if (l >= VDEV_LABELS/2 || offset > sizeof (vdev_label_t)) { 210 errnum = ERR_BAD_ARGUMENT; 211 return (0); 212 } 213 214 return (offset + l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 215 0 : psize - VDEV_LABELS * sizeof (vdev_label_t))); 216 217 } 218 219 /* 220 * vdev_uberblock_compare takes two uberblock structures and returns an integer 221 * indicating the more recent of the two. 222 * Return Value = 1 if ub2 is more recent 223 * Return Value = -1 if ub1 is more recent 224 * The most recent uberblock is determined using its transaction number and 225 * timestamp. The uberblock with the highest transaction number is 226 * considered "newer". If the transaction numbers of the two blocks match, the 227 * timestamps are compared to determine the "newer" of the two. 228 */ 229 static int 230 vdev_uberblock_compare(uberblock_t *ub1, uberblock_t *ub2) 231 { 232 if (ub1->ub_txg < ub2->ub_txg) 233 return (-1); 234 if (ub1->ub_txg > ub2->ub_txg) 235 return (1); 236 237 if (ub1->ub_timestamp < ub2->ub_timestamp) 238 return (-1); 239 if (ub1->ub_timestamp > ub2->ub_timestamp) 240 return (1); 241 242 return (0); 243 } 244 245 /* 246 * Three pieces of information are needed to verify an uberblock: the magic 247 * number, the version number, and the checksum. 248 * 249 * Currently Implemented: version number, magic number 250 * Need to Implement: checksum 251 * 252 * Return: 253 * 0 - Success 254 * -1 - Failure 255 */ 256 static int 257 uberblock_verify(uberblock_phys_t *ub, int offset) 258 { 259 260 uberblock_t *uber = &ub->ubp_uberblock; 261 blkptr_t bp; 262 263 BP_ZERO(&bp); 264 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 265 BP_SET_BYTEORDER(&bp, ZFS_HOST_BYTEORDER); 266 ZIO_SET_CHECKSUM(&bp.blk_cksum, offset, 0, 0, 0); 267 268 if (zio_checksum_verify(&bp, (char *)ub, UBERBLOCK_SIZE) != 0) 269 return (-1); 270 271 if (uber->ub_magic == UBERBLOCK_MAGIC && 272 uber->ub_version >= SPA_VERSION_1 && 273 uber->ub_version <= SPA_VERSION) 274 return (0); 275 276 return (-1); 277 } 278 279 /* 280 * Find the best uberblock. 281 * Return: 282 * Success - Pointer to the best uberblock. 283 * Failure - NULL 284 */ 285 static uberblock_phys_t * 286 find_bestub(uberblock_phys_t *ub_array, int label) 287 { 288 uberblock_phys_t *ubbest = NULL; 289 int i, offset; 290 291 for (i = 0; i < (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT); i++) { 292 offset = vdev_label_offset(0, label, VDEV_UBERBLOCK_OFFSET(i)); 293 if (errnum == ERR_BAD_ARGUMENT) 294 return (NULL); 295 if (uberblock_verify(&ub_array[i], offset) == 0) { 296 if (ubbest == NULL) { 297 ubbest = &ub_array[i]; 298 } else if (vdev_uberblock_compare( 299 &(ub_array[i].ubp_uberblock), 300 &(ubbest->ubp_uberblock)) > 0) { 301 ubbest = &ub_array[i]; 302 } 303 } 304 } 305 306 return (ubbest); 307 } 308 309 /* 310 * Read in a block and put its uncompressed data in buf. 311 * 312 * Return: 313 * 0 - success 314 * errnum - failure 315 */ 316 static int 317 zio_read(blkptr_t *bp, void *buf, char *stack) 318 { 319 uint64_t offset, sector; 320 int psize, lsize; 321 int i, comp, cksum; 322 323 psize = BP_GET_PSIZE(bp); 324 lsize = BP_GET_LSIZE(bp); 325 comp = BP_GET_COMPRESS(bp); 326 cksum = BP_GET_CHECKSUM(bp); 327 328 if ((unsigned int)comp >= ZIO_COMPRESS_FUNCTIONS || 329 comp != ZIO_COMPRESS_OFF && decomp_table[comp].decomp_func == NULL) 330 return (ERR_FSYS_CORRUPT); 331 332 if ((char *)buf < stack && ((char *)buf) + lsize > stack) 333 return (ERR_FSYS_CORRUPT); 334 /* pick a good dva from the block pointer */ 335 for (i = 0; i < SPA_DVAS_PER_BP; i++) { 336 337 if (bp->blk_dva[i].dva_word[0] == 0 && 338 bp->blk_dva[i].dva_word[1] == 0) 339 continue; 340 341 /* read in a block */ 342 offset = DVA_GET_OFFSET(&bp->blk_dva[i]); 343 sector = DVA_OFFSET_TO_PHYS_SECTOR(offset); 344 345 if (comp != ZIO_COMPRESS_OFF) { 346 347 if (devread(sector, 0, psize, stack) == 0) 348 continue; 349 if (zio_checksum_verify(bp, stack, psize) != 0) 350 continue; 351 decomp_table[comp].decomp_func(stack, buf, psize, 352 lsize); 353 } else { 354 if (devread(sector, 0, psize, buf) == 0) 355 continue; 356 if (zio_checksum_verify(bp, buf, psize) != 0) 357 continue; 358 } 359 return (0); 360 } 361 362 return (ERR_FSYS_CORRUPT); 363 } 364 365 /* 366 * Get the block from a block id. 367 * push the block onto the stack. 368 * 369 * Return: 370 * 0 - success 371 * errnum - failure 372 */ 373 static int 374 dmu_read(dnode_phys_t *dn, uint64_t blkid, void *buf, char *stack) 375 { 376 int idx, level; 377 blkptr_t *bp_array = dn->dn_blkptr; 378 int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 379 blkptr_t *bp, *tmpbuf; 380 381 bp = (blkptr_t *)stack; 382 stack += sizeof (blkptr_t); 383 384 tmpbuf = (blkptr_t *)stack; 385 stack += 1<<dn->dn_indblkshift; 386 387 for (level = dn->dn_nlevels - 1; level >= 0; level--) { 388 idx = (blkid >> (epbs * level)) & ((1<<epbs)-1); 389 *bp = bp_array[idx]; 390 if (level == 0) 391 tmpbuf = buf; 392 if (BP_IS_HOLE(bp)) { 393 grub_memset(buf, 0, 394 dn->dn_datablkszsec << SPA_MINBLOCKSHIFT); 395 break; 396 } else if (errnum = zio_read(bp, tmpbuf, stack)) { 397 return (errnum); 398 } 399 400 bp_array = tmpbuf; 401 } 402 403 return (0); 404 } 405 406 /* 407 * mzap_lookup: Looks up property described by "name" and returns the value 408 * in "value". 409 * 410 * Return: 411 * 0 - success 412 * errnum - failure 413 */ 414 static int 415 mzap_lookup(mzap_phys_t *zapobj, int objsize, char *name, 416 uint64_t *value) 417 { 418 int i, chunks; 419 mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk; 420 421 chunks = objsize/MZAP_ENT_LEN - 1; 422 for (i = 0; i < chunks; i++) { 423 if (grub_strcmp(mzap_ent[i].mze_name, name) == 0) { 424 *value = mzap_ent[i].mze_value; 425 return (0); 426 } 427 } 428 429 return (ERR_FSYS_CORRUPT); 430 } 431 432 static uint64_t 433 zap_hash(uint64_t salt, const char *name) 434 { 435 static uint64_t table[256]; 436 const uint8_t *cp; 437 uint8_t c; 438 uint64_t crc = salt; 439 440 if (table[128] == 0) { 441 uint64_t *ct; 442 int i, j; 443 for (i = 0; i < 256; i++) { 444 for (ct = table + i, *ct = i, j = 8; j > 0; j--) 445 *ct = (*ct >> 1) ^ (-(*ct & 1) & 446 ZFS_CRC64_POLY); 447 } 448 } 449 450 if (crc == 0 || table[128] != ZFS_CRC64_POLY) { 451 errnum = ERR_FSYS_CORRUPT; 452 return (0); 453 } 454 455 for (cp = (const uint8_t *)name; (c = *cp) != '\0'; cp++) 456 crc = (crc >> 8) ^ table[(crc ^ c) & 0xFF]; 457 458 /* 459 * Only use 28 bits, since we need 4 bits in the cookie for the 460 * collision differentiator. We MUST use the high bits, since 461 * those are the onces that we first pay attention to when 462 * chosing the bucket. 463 */ 464 crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1); 465 466 return (crc); 467 } 468 469 /* 470 * Only to be used on 8-bit arrays. 471 * array_len is actual len in bytes (not encoded le_value_length). 472 * buf is null-terminated. 473 */ 474 static int 475 zap_leaf_array_equal(zap_leaf_phys_t *l, int blksft, int chunk, 476 int array_len, const char *buf) 477 { 478 int bseen = 0; 479 480 while (bseen < array_len) { 481 struct zap_leaf_array *la = 482 &ZAP_LEAF_CHUNK(l, blksft, chunk).l_array; 483 int toread = MIN(array_len - bseen, ZAP_LEAF_ARRAY_BYTES); 484 485 if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) 486 return (0); 487 488 if (zfs_bcmp(la->la_array, buf + bseen, toread) != 0) 489 break; 490 chunk = la->la_next; 491 bseen += toread; 492 } 493 return (bseen == array_len); 494 } 495 496 /* 497 * Given a zap_leaf_phys_t, walk thru the zap leaf chunks to get the 498 * value for the property "name". 499 * 500 * Return: 501 * 0 - success 502 * errnum - failure 503 */ 504 static int 505 zap_leaf_lookup(zap_leaf_phys_t *l, int blksft, uint64_t h, 506 const char *name, uint64_t *value) 507 { 508 uint16_t chunk; 509 struct zap_leaf_entry *le; 510 511 /* Verify if this is a valid leaf block */ 512 if (l->l_hdr.lh_block_type != ZBT_LEAF) 513 return (ERR_FSYS_CORRUPT); 514 if (l->l_hdr.lh_magic != ZAP_LEAF_MAGIC) 515 return (ERR_FSYS_CORRUPT); 516 517 for (chunk = l->l_hash[LEAF_HASH(blksft, h)]; 518 chunk != CHAIN_END; chunk = le->le_next) { 519 520 if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) 521 return (ERR_FSYS_CORRUPT); 522 523 le = ZAP_LEAF_ENTRY(l, blksft, chunk); 524 525 /* Verify the chunk entry */ 526 if (le->le_type != ZAP_CHUNK_ENTRY) 527 return (ERR_FSYS_CORRUPT); 528 529 if (le->le_hash != h) 530 continue; 531 532 if (zap_leaf_array_equal(l, blksft, le->le_name_chunk, 533 le->le_name_length, name)) { 534 535 struct zap_leaf_array *la; 536 uint8_t *ip; 537 538 if (le->le_int_size != 8 || le->le_value_length != 1) 539 return (ERR_FSYS_CORRUPT); 540 541 /* get the uint64_t property value */ 542 la = &ZAP_LEAF_CHUNK(l, blksft, 543 le->le_value_chunk).l_array; 544 ip = la->la_array; 545 546 *value = (uint64_t)ip[0] << 56 | (uint64_t)ip[1] << 48 | 547 (uint64_t)ip[2] << 40 | (uint64_t)ip[3] << 32 | 548 (uint64_t)ip[4] << 24 | (uint64_t)ip[5] << 16 | 549 (uint64_t)ip[6] << 8 | (uint64_t)ip[7]; 550 551 return (0); 552 } 553 } 554 555 return (ERR_FSYS_CORRUPT); 556 } 557 558 /* 559 * Fat ZAP lookup 560 * 561 * Return: 562 * 0 - success 563 * errnum - failure 564 */ 565 static int 566 fzap_lookup(dnode_phys_t *zap_dnode, zap_phys_t *zap, 567 char *name, uint64_t *value, char *stack) 568 { 569 zap_leaf_phys_t *l; 570 uint64_t hash, idx, blkid; 571 int blksft = zfs_log2(zap_dnode->dn_datablkszsec << DNODE_SHIFT); 572 573 /* Verify if this is a fat zap header block */ 574 if (zap->zap_magic != (uint64_t)ZAP_MAGIC) 575 return (ERR_FSYS_CORRUPT); 576 577 hash = zap_hash(zap->zap_salt, name); 578 if (errnum) 579 return (errnum); 580 581 /* get block id from index */ 582 if (zap->zap_ptrtbl.zt_numblks != 0) { 583 /* external pointer tables not supported */ 584 return (ERR_FSYS_CORRUPT); 585 } 586 idx = ZAP_HASH_IDX(hash, zap->zap_ptrtbl.zt_shift); 587 blkid = ((uint64_t *)zap)[idx + (1<<(blksft-3-1))]; 588 589 /* Get the leaf block */ 590 l = (zap_leaf_phys_t *)stack; 591 stack += 1<<blksft; 592 if ((1<<blksft) < sizeof (zap_leaf_phys_t)) 593 return (ERR_FSYS_CORRUPT); 594 if (errnum = dmu_read(zap_dnode, blkid, l, stack)) 595 return (errnum); 596 597 return (zap_leaf_lookup(l, blksft, hash, name, value)); 598 } 599 600 /* 601 * Read in the data of a zap object and find the value for a matching 602 * property name. 603 * 604 * Return: 605 * 0 - success 606 * errnum - failure 607 */ 608 static int 609 zap_lookup(dnode_phys_t *zap_dnode, char *name, uint64_t *val, char *stack) 610 { 611 uint64_t block_type; 612 int size; 613 void *zapbuf; 614 615 /* Read in the first block of the zap object data. */ 616 zapbuf = stack; 617 size = zap_dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 618 stack += size; 619 if (errnum = dmu_read(zap_dnode, 0, zapbuf, stack)) 620 return (errnum); 621 622 block_type = *((uint64_t *)zapbuf); 623 624 if (block_type == ZBT_MICRO) { 625 return (mzap_lookup(zapbuf, size, name, val)); 626 } else if (block_type == ZBT_HEADER) { 627 /* this is a fat zap */ 628 return (fzap_lookup(zap_dnode, zapbuf, name, 629 val, stack)); 630 } 631 632 return (ERR_FSYS_CORRUPT); 633 } 634 635 /* 636 * Get the dnode of an object number from the metadnode of an object set. 637 * 638 * Input 639 * mdn - metadnode to get the object dnode 640 * objnum - object number for the object dnode 641 * buf - data buffer that holds the returning dnode 642 * stack - scratch area 643 * 644 * Return: 645 * 0 - success 646 * errnum - failure 647 */ 648 static int 649 dnode_get(dnode_phys_t *mdn, uint64_t objnum, uint8_t type, dnode_phys_t *buf, 650 char *stack) 651 { 652 uint64_t blkid, blksz; /* the block id this object dnode is in */ 653 int epbs; /* shift of number of dnodes in a block */ 654 int idx; /* index within a block */ 655 dnode_phys_t *dnbuf; 656 657 blksz = mdn->dn_datablkszsec << SPA_MINBLOCKSHIFT; 658 epbs = zfs_log2(blksz) - DNODE_SHIFT; 659 blkid = objnum >> epbs; 660 idx = objnum & ((1<<epbs)-1); 661 662 if (dnode_buf != NULL && dnode_mdn == mdn && 663 objnum >= dnode_start && objnum < dnode_end) { 664 grub_memmove(buf, &dnode_buf[idx], DNODE_SIZE); 665 VERIFY_DN_TYPE(buf, type); 666 return (0); 667 } 668 669 if (dnode_buf && blksz == 1<<DNODE_BLOCK_SHIFT) { 670 dnbuf = dnode_buf; 671 dnode_mdn = mdn; 672 dnode_start = blkid << epbs; 673 dnode_end = (blkid + 1) << epbs; 674 } else { 675 dnbuf = (dnode_phys_t *)stack; 676 stack += blksz; 677 } 678 679 if (errnum = dmu_read(mdn, blkid, (char *)dnbuf, stack)) 680 return (errnum); 681 682 grub_memmove(buf, &dnbuf[idx], DNODE_SIZE); 683 VERIFY_DN_TYPE(buf, type); 684 685 return (0); 686 } 687 688 /* 689 * Check if this is a special file that resides at the top 690 * dataset of the pool. Currently this is the GRUB menu, 691 * boot signature and boot signature backup. 692 * str starts with '/'. 693 */ 694 static int 695 is_top_dataset_file(char *str) 696 { 697 char *tptr; 698 699 if ((tptr = grub_strstr(str, "menu.lst")) && 700 (tptr[8] == '\0' || tptr[8] == ' ') && 701 *(tptr-1) == '/') 702 return (1); 703 704 if (grub_strncmp(str, BOOTSIGN_DIR"/", 705 grub_strlen(BOOTSIGN_DIR) + 1) == 0) 706 return (1); 707 708 if (grub_strcmp(str, BOOTSIGN_BACKUP) == 0) 709 return (1); 710 711 return (0); 712 } 713 714 /* 715 * Get the file dnode for a given file name where mdn is the meta dnode 716 * for this ZFS object set. When found, place the file dnode in dn. 717 * The 'path' argument will be mangled. 718 * 719 * Return: 720 * 0 - success 721 * errnum - failure 722 */ 723 static int 724 dnode_get_path(dnode_phys_t *mdn, char *path, dnode_phys_t *dn, 725 char *stack) 726 { 727 uint64_t objnum, version; 728 char *cname, ch; 729 730 if (errnum = dnode_get(mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE, 731 dn, stack)) 732 return (errnum); 733 734 if (errnum = zap_lookup(dn, ZPL_VERSION_STR, &version, stack)) 735 return (errnum); 736 if (version > ZPL_VERSION) 737 return (-1); 738 739 if (errnum = zap_lookup(dn, ZFS_ROOT_OBJ, &objnum, stack)) 740 return (errnum); 741 742 if (errnum = dnode_get(mdn, objnum, DMU_OT_DIRECTORY_CONTENTS, 743 dn, stack)) 744 return (errnum); 745 746 /* skip leading slashes */ 747 while (*path == '/') 748 path++; 749 750 while (*path && !isspace(*path)) { 751 752 /* get the next component name */ 753 cname = path; 754 while (*path && !isspace(*path) && *path != '/') 755 path++; 756 ch = *path; 757 *path = 0; /* ensure null termination */ 758 759 if (errnum = zap_lookup(dn, cname, &objnum, stack)) 760 return (errnum); 761 762 objnum = ZFS_DIRENT_OBJ(objnum); 763 if (errnum = dnode_get(mdn, objnum, 0, dn, stack)) 764 return (errnum); 765 766 *path = ch; 767 while (*path == '/') 768 path++; 769 } 770 771 /* We found the dnode for this file. Verify if it is a plain file. */ 772 VERIFY_DN_TYPE(dn, DMU_OT_PLAIN_FILE_CONTENTS); 773 774 return (0); 775 } 776 777 /* 778 * Get the default 'bootfs' property value from the rootpool. 779 * 780 * Return: 781 * 0 - success 782 * errnum -failure 783 */ 784 static int 785 get_default_bootfsobj(dnode_phys_t *mosmdn, uint64_t *obj, char *stack) 786 { 787 uint64_t objnum = 0; 788 dnode_phys_t *dn = (dnode_phys_t *)stack; 789 stack += DNODE_SIZE; 790 791 if (errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, 792 DMU_OT_OBJECT_DIRECTORY, dn, stack)) 793 return (errnum); 794 795 /* 796 * find the object number for 'pool_props', and get the dnode 797 * of the 'pool_props'. 798 */ 799 if (zap_lookup(dn, DMU_POOL_PROPS, &objnum, stack)) 800 return (ERR_FILESYSTEM_NOT_FOUND); 801 802 if (errnum = dnode_get(mosmdn, objnum, DMU_OT_POOL_PROPS, dn, stack)) 803 return (errnum); 804 805 if (zap_lookup(dn, ZPOOL_PROP_BOOTFS, &objnum, stack)) 806 return (ERR_FILESYSTEM_NOT_FOUND); 807 808 if (!objnum) 809 return (ERR_FILESYSTEM_NOT_FOUND); 810 811 *obj = objnum; 812 return (0); 813 } 814 815 /* 816 * Given a MOS metadnode, get the metadnode of a given filesystem name (fsname), 817 * e.g. pool/rootfs, or a given object number (obj), e.g. the object number 818 * of pool/rootfs. 819 * 820 * If no fsname and no obj are given, return the DSL_DIR metadnode. 821 * If fsname is given, return its metadnode and its matching object number. 822 * If only obj is given, return the metadnode for this object number. 823 * 824 * Return: 825 * 0 - success 826 * errnum - failure 827 */ 828 static int 829 get_objset_mdn(dnode_phys_t *mosmdn, char *fsname, uint64_t *obj, 830 dnode_phys_t *mdn, char *stack) 831 { 832 uint64_t objnum, headobj; 833 char *cname, ch; 834 blkptr_t *bp; 835 objset_phys_t *osp; 836 837 if (fsname == NULL && obj) { 838 headobj = *obj; 839 goto skip; 840 } 841 842 if (errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, 843 DMU_OT_OBJECT_DIRECTORY, mdn, stack)) 844 return (errnum); 845 846 if (errnum = zap_lookup(mdn, DMU_POOL_ROOT_DATASET, &objnum, 847 stack)) 848 return (errnum); 849 850 if (errnum = dnode_get(mosmdn, objnum, DMU_OT_DSL_DIR, mdn, stack)) 851 return (errnum); 852 853 if (fsname == NULL) { 854 headobj = 855 ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_head_dataset_obj; 856 goto skip; 857 } 858 859 /* take out the pool name */ 860 while (*fsname && !isspace(*fsname) && *fsname != '/') 861 fsname++; 862 863 while (*fsname && !isspace(*fsname)) { 864 uint64_t childobj; 865 866 while (*fsname == '/') 867 fsname++; 868 869 cname = fsname; 870 while (*fsname && !isspace(*fsname) && *fsname != '/') 871 fsname++; 872 ch = *fsname; 873 *fsname = 0; 874 875 childobj = 876 ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_child_dir_zapobj; 877 if (errnum = dnode_get(mosmdn, childobj, 878 DMU_OT_DSL_DIR_CHILD_MAP, mdn, stack)) 879 return (errnum); 880 881 if (zap_lookup(mdn, cname, &objnum, stack)) 882 return (ERR_FILESYSTEM_NOT_FOUND); 883 884 if (errnum = dnode_get(mosmdn, objnum, DMU_OT_DSL_DIR, 885 mdn, stack)) 886 return (errnum); 887 888 *fsname = ch; 889 } 890 headobj = ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_head_dataset_obj; 891 if (obj) 892 *obj = headobj; 893 894 skip: 895 if (errnum = dnode_get(mosmdn, headobj, DMU_OT_DSL_DATASET, mdn, stack)) 896 return (errnum); 897 898 /* TODO: Add snapshot support here - for fsname=snapshot-name */ 899 900 bp = &((dsl_dataset_phys_t *)DN_BONUS(mdn))->ds_bp; 901 osp = (objset_phys_t *)stack; 902 stack += sizeof (objset_phys_t); 903 if (errnum = zio_read(bp, osp, stack)) 904 return (errnum); 905 906 grub_memmove((char *)mdn, (char *)&osp->os_meta_dnode, DNODE_SIZE); 907 908 return (0); 909 } 910 911 /* 912 * For a given XDR packed nvlist, verify the first 4 bytes and move on. 913 * 914 * An XDR packed nvlist is encoded as (comments from nvs_xdr_create) : 915 * 916 * encoding method/host endian (4 bytes) 917 * nvl_version (4 bytes) 918 * nvl_nvflag (4 bytes) 919 * encoded nvpairs: 920 * encoded size of the nvpair (4 bytes) 921 * decoded size of the nvpair (4 bytes) 922 * name string size (4 bytes) 923 * name string data (sizeof(NV_ALIGN4(string)) 924 * data type (4 bytes) 925 * # of elements in the nvpair (4 bytes) 926 * data 927 * 2 zero's for the last nvpair 928 * (end of the entire list) (8 bytes) 929 * 930 * Return: 931 * 0 - success 932 * 1 - failure 933 */ 934 static int 935 nvlist_unpack(char *nvlist, char **out) 936 { 937 /* Verify if the 1st and 2nd byte in the nvlist are valid. */ 938 if (nvlist[0] != NV_ENCODE_XDR || nvlist[1] != HOST_ENDIAN) 939 return (1); 940 941 nvlist += 4; 942 *out = nvlist; 943 return (0); 944 } 945 946 static char * 947 nvlist_array(char *nvlist, int index) 948 { 949 int i, encode_size; 950 951 for (i = 0; i < index; i++) { 952 /* skip the header, nvl_version, and nvl_nvflag */ 953 nvlist = nvlist + 4 * 2; 954 955 while (encode_size = BSWAP_32(*(uint32_t *)nvlist)) 956 nvlist += encode_size; /* goto the next nvpair */ 957 958 nvlist = nvlist + 4 * 2; /* skip the ending 2 zeros - 8 bytes */ 959 } 960 961 return (nvlist); 962 } 963 964 static int 965 nvlist_lookup_value(char *nvlist, char *name, void *val, int valtype, 966 int *nelmp) 967 { 968 int name_len, type, slen, encode_size; 969 char *nvpair, *nvp_name, *strval = val; 970 uint64_t *intval = val; 971 972 /* skip the header, nvl_version, and nvl_nvflag */ 973 nvlist = nvlist + 4 * 2; 974 975 /* 976 * Loop thru the nvpair list 977 * The XDR representation of an integer is in big-endian byte order. 978 */ 979 while (encode_size = BSWAP_32(*(uint32_t *)nvlist)) { 980 981 nvpair = nvlist + 4 * 2; /* skip the encode/decode size */ 982 983 name_len = BSWAP_32(*(uint32_t *)nvpair); 984 nvpair += 4; 985 986 nvp_name = nvpair; 987 nvpair = nvpair + ((name_len + 3) & ~3); /* align */ 988 989 type = BSWAP_32(*(uint32_t *)nvpair); 990 nvpair += 4; 991 992 if ((grub_strncmp(nvp_name, name, name_len) == 0) && 993 type == valtype) { 994 int nelm; 995 996 if ((nelm = BSWAP_32(*(uint32_t *)nvpair)) < 1) 997 return (1); 998 nvpair += 4; 999 1000 switch (valtype) { 1001 case DATA_TYPE_STRING: 1002 slen = BSWAP_32(*(uint32_t *)nvpair); 1003 nvpair += 4; 1004 grub_memmove(strval, nvpair, slen); 1005 strval[slen] = '\0'; 1006 return (0); 1007 1008 case DATA_TYPE_UINT64: 1009 *intval = BSWAP_64(*(uint64_t *)nvpair); 1010 return (0); 1011 1012 case DATA_TYPE_NVLIST: 1013 *(void **)val = (void *)nvpair; 1014 return (0); 1015 1016 case DATA_TYPE_NVLIST_ARRAY: 1017 *(void **)val = (void *)nvpair; 1018 if (nelmp) 1019 *nelmp = nelm; 1020 return (0); 1021 } 1022 } 1023 1024 nvlist += encode_size; /* goto the next nvpair */ 1025 } 1026 1027 return (1); 1028 } 1029 1030 /* 1031 * Check if this vdev is online and is in a good state. 1032 */ 1033 static int 1034 vdev_validate(char *nv) 1035 { 1036 uint64_t ival; 1037 1038 if (nvlist_lookup_value(nv, ZPOOL_CONFIG_OFFLINE, &ival, 1039 DATA_TYPE_UINT64, NULL) == 0 || 1040 nvlist_lookup_value(nv, ZPOOL_CONFIG_FAULTED, &ival, 1041 DATA_TYPE_UINT64, NULL) == 0 || 1042 nvlist_lookup_value(nv, ZPOOL_CONFIG_REMOVED, &ival, 1043 DATA_TYPE_UINT64, NULL) == 0) 1044 return (ERR_DEV_VALUES); 1045 1046 return (0); 1047 } 1048 1049 /* 1050 * Get a list of valid vdev pathname from the boot device. 1051 * The caller should already allocate MAXNAMELEN memory for bootpath. 1052 */ 1053 int 1054 vdev_get_bootpath(char *nv, uint64_t inguid, char *devid, char *bootpath) 1055 { 1056 char type[16]; 1057 1058 bootpath[0] = '\0'; 1059 if (nvlist_lookup_value(nv, ZPOOL_CONFIG_TYPE, &type, DATA_TYPE_STRING, 1060 NULL)) 1061 return (ERR_FSYS_CORRUPT); 1062 1063 if (strcmp(type, VDEV_TYPE_DISK) == 0) { 1064 if (vdev_validate(nv) != 0 || 1065 (nvlist_lookup_value(nv, ZPOOL_CONFIG_PHYS_PATH, 1066 bootpath, DATA_TYPE_STRING, NULL) != 0) || 1067 (nvlist_lookup_value(nv, ZPOOL_CONFIG_DEVID, 1068 devid, DATA_TYPE_STRING, NULL) != 0)) 1069 return (ERR_NO_BOOTPATH); 1070 1071 } else if (strcmp(type, VDEV_TYPE_MIRROR) == 0) { 1072 int nelm, i; 1073 char *child; 1074 1075 if (nvlist_lookup_value(nv, ZPOOL_CONFIG_CHILDREN, &child, 1076 DATA_TYPE_NVLIST_ARRAY, &nelm)) 1077 return (ERR_FSYS_CORRUPT); 1078 1079 for (i = 0; i < nelm; i++) { 1080 char tmp_path[MAXNAMELEN]; 1081 char tmp_devid[MAXNAMELEN]; 1082 char *child_i; 1083 uint64_t guid; 1084 1085 child_i = nvlist_array(child, i); 1086 if (vdev_validate(child_i) != 0) 1087 continue; 1088 1089 if (nvlist_lookup_value(child_i, ZPOOL_CONFIG_PHYS_PATH, 1090 tmp_path, DATA_TYPE_STRING, NULL) != 0) 1091 return (ERR_NO_BOOTPATH); 1092 1093 if ((strlen(bootpath) + strlen(tmp_path)) > MAXNAMELEN) 1094 return (ERR_WONT_FIT); 1095 1096 if (nvlist_lookup_value(child_i, ZPOOL_CONFIG_GUID, 1097 &guid, DATA_TYPE_UINT64, NULL) != 0) 1098 return (ERR_NO_BOOTPATH); 1099 if (nvlist_lookup_value(child_i, ZPOOL_CONFIG_DEVID, 1100 tmp_devid, DATA_TYPE_STRING, NULL) != 0) 1101 return (ERR_NO_BOOTPATH); 1102 if (guid == inguid) { 1103 sprintf(devid, "%s", tmp_devid); 1104 sprintf(bootpath, "%s", tmp_path); 1105 break; 1106 } 1107 } 1108 } 1109 1110 return (strlen(bootpath) > 0 ? 0 : ERR_NO_BOOTPATH); 1111 } 1112 1113 /* 1114 * Check the disk label information and retrieve needed vdev name-value pairs. 1115 * 1116 * Return: 1117 * 0 - success 1118 * ERR_* - failure 1119 */ 1120 int 1121 check_pool_label(int label, char *stack, char *outdevid, char *outpath) 1122 { 1123 vdev_phys_t *vdev; 1124 uint64_t sector, pool_state, txg = 0; 1125 char *nvlist, *nv; 1126 uint64_t diskguid; 1127 1128 sector = (label * sizeof (vdev_label_t) + VDEV_SKIP_SIZE + 1129 VDEV_BOOT_HEADER_SIZE) >> SPA_MINBLOCKSHIFT; 1130 1131 /* Read in the vdev name-value pair list (112K). */ 1132 if (devread(sector, 0, VDEV_PHYS_SIZE, stack) == 0) 1133 return (ERR_READ); 1134 1135 vdev = (vdev_phys_t *)stack; 1136 stack += sizeof(vdev_phys_t); 1137 1138 if (nvlist_unpack(vdev->vp_nvlist, &nvlist)) 1139 return (ERR_FSYS_CORRUPT); 1140 1141 if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_STATE, &pool_state, 1142 DATA_TYPE_UINT64, NULL)) 1143 return (ERR_FSYS_CORRUPT); 1144 1145 if (pool_state == POOL_STATE_DESTROYED) 1146 return (ERR_FILESYSTEM_NOT_FOUND); 1147 1148 if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_NAME, 1149 current_rootpool, DATA_TYPE_STRING, NULL)) 1150 return (ERR_FSYS_CORRUPT); 1151 1152 if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_TXG, &txg, 1153 DATA_TYPE_UINT64, NULL)) 1154 return (ERR_FSYS_CORRUPT); 1155 1156 /* not an active device */ 1157 if (txg == 0) 1158 return (ERR_NO_BOOTPATH); 1159 1160 if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_VDEV_TREE, &nv, 1161 DATA_TYPE_NVLIST, NULL)) 1162 return (ERR_FSYS_CORRUPT); 1163 if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_GUID, &diskguid, 1164 DATA_TYPE_UINT64, NULL)) 1165 return (ERR_FSYS_CORRUPT); 1166 if (vdev_get_bootpath(nv, diskguid, outdevid, outpath)) 1167 return (ERR_NO_BOOTPATH); 1168 return (0); 1169 } 1170 1171 /* 1172 * zfs_mount() locates a valid uberblock of the root pool and read in its MOS 1173 * to the memory address MOS. 1174 * 1175 * Return: 1176 * 1 - success 1177 * 0 - failure 1178 */ 1179 int 1180 zfs_mount(void) 1181 { 1182 char *stack; 1183 int label = 0; 1184 uberblock_phys_t *ub_array, *ubbest = NULL; 1185 vdev_boot_header_t *bh; 1186 objset_phys_t *osp; 1187 char tmp_bootpath[MAXNAMELEN]; 1188 char tmp_devid[MAXNAMELEN]; 1189 1190 /* if it's our first time here, zero the best uberblock out */ 1191 if (best_drive == 0 && best_part == 0 && find_best_root) 1192 grub_memset(¤t_uberblock, 0, sizeof(uberblock_t)); 1193 1194 stackbase = ZFS_SCRATCH; 1195 stack = stackbase; 1196 ub_array = (uberblock_phys_t *)stack; 1197 stack += VDEV_UBERBLOCK_RING; 1198 1199 bh = (vdev_boot_header_t *)stack; 1200 stack += VDEV_BOOT_HEADER_SIZE; 1201 1202 osp = (objset_phys_t *)stack; 1203 stack += sizeof (objset_phys_t); 1204 1205 /* XXX add back labels support? */ 1206 for (label = 0; ubbest == NULL && label < (VDEV_LABELS/2); label++) { 1207 uint64_t sector = (label * sizeof (vdev_label_t) + 1208 VDEV_SKIP_SIZE) >> SPA_MINBLOCKSHIFT; 1209 if (devread(sector, 0, VDEV_BOOT_HEADER_SIZE, 1210 (char *)bh) == 0) 1211 continue; 1212 if ((bh->vb_magic != VDEV_BOOT_MAGIC) || 1213 (bh->vb_version != VDEV_BOOT_VERSION)) { 1214 continue; 1215 } 1216 sector += (VDEV_BOOT_HEADER_SIZE + 1217 VDEV_PHYS_SIZE) >> SPA_MINBLOCKSHIFT; 1218 1219 /* Read in the uberblock ring (128K). */ 1220 if (devread(sector, 0, VDEV_UBERBLOCK_RING, 1221 (char *)ub_array) == 0) 1222 continue; 1223 1224 if ((ubbest = find_bestub(ub_array, label)) != NULL && 1225 zio_read(&ubbest->ubp_uberblock.ub_rootbp, osp, stack) 1226 == 0) { 1227 1228 VERIFY_OS_TYPE(osp, DMU_OST_META); 1229 1230 if (check_pool_label(label, stack, tmp_devid, tmp_bootpath)) 1231 return (0); 1232 1233 if (find_best_root && 1234 vdev_uberblock_compare(&ubbest->ubp_uberblock, 1235 &(current_uberblock)) <= 0) 1236 continue; 1237 /* Got the MOS. Save it at the memory addr MOS. */ 1238 grub_memmove(MOS, &osp->os_meta_dnode, DNODE_SIZE); 1239 grub_memmove(¤t_uberblock, 1240 &ubbest->ubp_uberblock, 1241 sizeof(uberblock_t)); 1242 grub_memmove(current_bootpath, tmp_bootpath, 1243 MAXNAMELEN); 1244 grub_memmove(current_devid, tmp_devid, 1245 grub_strlen(tmp_devid)); 1246 is_zfs_mount = 1; 1247 return (1); 1248 } 1249 } 1250 1251 return (0); 1252 } 1253 1254 /* 1255 * zfs_open() locates a file in the rootpool by following the 1256 * MOS and places the dnode of the file in the memory address DNODE. 1257 * 1258 * Return: 1259 * 1 - success 1260 * 0 - failure 1261 */ 1262 int 1263 zfs_open(char *filename) 1264 { 1265 char *stack; 1266 dnode_phys_t *mdn; 1267 1268 file_buf = NULL; 1269 stackbase = ZFS_SCRATCH; 1270 stack = stackbase; 1271 1272 mdn = (dnode_phys_t *)stack; 1273 stack += sizeof (dnode_phys_t); 1274 1275 dnode_mdn = NULL; 1276 dnode_buf = (dnode_phys_t *)stack; 1277 stack += 1<<DNODE_BLOCK_SHIFT; 1278 1279 /* 1280 * menu.lst is placed at the root pool filesystem level, 1281 * do not goto 'current_bootfs'. 1282 */ 1283 if (is_top_dataset_file(filename)) { 1284 if (errnum = get_objset_mdn(MOS, NULL, NULL, mdn, stack)) 1285 return (0); 1286 1287 current_bootfs_obj = 0; 1288 } else { 1289 if (current_bootfs[0] == '\0') { 1290 /* Get the default root filesystem object number */ 1291 if (errnum = get_default_bootfsobj(MOS, 1292 ¤t_bootfs_obj, stack)) 1293 return (0); 1294 1295 if (errnum = get_objset_mdn(MOS, NULL, 1296 ¤t_bootfs_obj, mdn, stack)) 1297 return (0); 1298 } else { 1299 if (errnum = get_objset_mdn(MOS, current_bootfs, 1300 ¤t_bootfs_obj, mdn, stack)) { 1301 grub_memset(current_bootfs, 0, MAXNAMELEN); 1302 return (0); 1303 } 1304 } 1305 } 1306 1307 if (dnode_get_path(mdn, filename, DNODE, stack)) { 1308 errnum = ERR_FILE_NOT_FOUND; 1309 return (0); 1310 } 1311 1312 /* get the file size and set the file position to 0 */ 1313 filemax = ((znode_phys_t *)DN_BONUS(DNODE))->zp_size; 1314 filepos = 0; 1315 1316 dnode_buf = NULL; 1317 return (1); 1318 } 1319 1320 /* 1321 * zfs_read reads in the data blocks pointed by the DNODE. 1322 * 1323 * Return: 1324 * len - the length successfully read in to the buffer 1325 * 0 - failure 1326 */ 1327 int 1328 zfs_read(char *buf, int len) 1329 { 1330 char *stack; 1331 char *tmpbuf; 1332 int blksz, length, movesize; 1333 1334 if (file_buf == NULL) { 1335 file_buf = stackbase; 1336 stackbase += SPA_MAXBLOCKSIZE; 1337 file_start = file_end = 0; 1338 } 1339 stack = stackbase; 1340 1341 /* 1342 * If offset is in memory, move it into the buffer provided and return. 1343 */ 1344 if (filepos >= file_start && filepos+len <= file_end) { 1345 grub_memmove(buf, file_buf + filepos - file_start, len); 1346 filepos += len; 1347 return (len); 1348 } 1349 1350 blksz = DNODE->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1351 1352 /* 1353 * Entire Dnode is too big to fit into the space available. We 1354 * will need to read it in chunks. This could be optimized to 1355 * read in as large a chunk as there is space available, but for 1356 * now, this only reads in one data block at a time. 1357 */ 1358 length = len; 1359 while (length) { 1360 /* 1361 * Find requested blkid and the offset within that block. 1362 */ 1363 uint64_t blkid = filepos / blksz; 1364 1365 if (errnum = dmu_read(DNODE, blkid, file_buf, stack)) 1366 return (0); 1367 1368 file_start = blkid * blksz; 1369 file_end = file_start + blksz; 1370 1371 movesize = MIN(length, file_end - filepos); 1372 1373 grub_memmove(buf, file_buf + filepos - file_start, 1374 movesize); 1375 buf += movesize; 1376 length -= movesize; 1377 filepos += movesize; 1378 } 1379 1380 return (len); 1381 } 1382 1383 /* 1384 * No-Op 1385 */ 1386 int 1387 zfs_embed(int *start_sector, int needed_sectors) 1388 { 1389 return (1); 1390 } 1391 1392 #endif /* FSYS_ZFS */ 1393