1b1b8ab34Slling /* 2b1b8ab34Slling * GRUB -- GRand Unified Bootloader 3b1b8ab34Slling * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4b1b8ab34Slling * 5b1b8ab34Slling * This program is free software; you can redistribute it and/or modify 6b1b8ab34Slling * it under the terms of the GNU General Public License as published by 7b1b8ab34Slling * the Free Software Foundation; either version 2 of the License, or 8b1b8ab34Slling * (at your option) any later version. 9b1b8ab34Slling * 10b1b8ab34Slling * This program is distributed in the hope that it will be useful, 11b1b8ab34Slling * but WITHOUT ANY WARRANTY; without even the implied warranty of 12b1b8ab34Slling * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13b1b8ab34Slling * GNU General Public License for more details. 14b1b8ab34Slling * 15b1b8ab34Slling * You should have received a copy of the GNU General Public License 16b1b8ab34Slling * along with this program; if not, write to the Free Software 17b1b8ab34Slling * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18b1b8ab34Slling */ 19ad135b5dSChristopher Siden 20b1b8ab34Slling /* 216e1f5caaSNeil Perrin * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 22b1b8ab34Slling * Use is subject to license terms. 23b1b8ab34Slling */ 24b1b8ab34Slling 25ad135b5dSChristopher Siden /* 262acef22dSMatthew Ahrens * Copyright (c) 2013 by Delphix. All rights reserved. 27a6f561b4SSašo Kiselkov * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 28ad135b5dSChristopher Siden */ 29ad135b5dSChristopher Siden 30b1b8ab34Slling /* 31b1b8ab34Slling * The zfs plug-in routines for GRUB are: 32b1b8ab34Slling * 33b1b8ab34Slling * zfs_mount() - locates a valid uberblock of the root pool and reads 34b1b8ab34Slling * in its MOS at the memory address MOS. 35b1b8ab34Slling * 36b1b8ab34Slling * zfs_open() - locates a plain file object by following the MOS 37b1b8ab34Slling * and places its dnode at the memory address DNODE. 38b1b8ab34Slling * 39b1b8ab34Slling * zfs_read() - read in the data blocks pointed by the DNODE. 40b1b8ab34Slling * 41b1b8ab34Slling * ZFS_SCRATCH is used as a working area. 42b1b8ab34Slling * 43b1b8ab34Slling * (memory addr) MOS DNODE ZFS_SCRATCH 44b1b8ab34Slling * | | | 45b1b8ab34Slling * +-------V---------V----------V---------------+ 46b1b8ab34Slling * memory | | dnode | dnode | scratch | 47b1b8ab34Slling * | | 512B | 512B | area | 48b1b8ab34Slling * +--------------------------------------------+ 49b1b8ab34Slling */ 50b1b8ab34Slling 51b1b8ab34Slling #ifdef FSYS_ZFS 52b1b8ab34Slling 53b1b8ab34Slling #include "shared.h" 54b1b8ab34Slling #include "filesys.h" 55b1b8ab34Slling #include "fsys_zfs.h" 56b1b8ab34Slling 57b1b8ab34Slling /* cache for a file block of the currently zfs_open()-ed file */ 58b1b8ab34Slling static void *file_buf = NULL; 59b1b8ab34Slling static uint64_t file_start = 0; 60b1b8ab34Slling static uint64_t file_end = 0; 61b1b8ab34Slling 62b1b8ab34Slling /* cache for a dnode block */ 63b1b8ab34Slling static dnode_phys_t *dnode_buf = NULL; 64b1b8ab34Slling static dnode_phys_t *dnode_mdn = NULL; 65b1b8ab34Slling static uint64_t dnode_start = 0; 66b1b8ab34Slling static uint64_t dnode_end = 0; 67b1b8ab34Slling 68e23347b1SEric Taylor static uint64_t pool_guid = 0; 69051aabe6Staylor static uberblock_t current_uberblock; 70b1b8ab34Slling static char *stackbase; 71b1b8ab34Slling 72b1b8ab34Slling decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = 73b1b8ab34Slling { 7415e6edf1Sgw {"inherit", 0}, /* ZIO_COMPRESS_INHERIT */ 75b1b8ab34Slling {"on", lzjb_decompress}, /* ZIO_COMPRESS_ON */ 7615e6edf1Sgw {"off", 0}, /* ZIO_COMPRESS_OFF */ 7715e6edf1Sgw {"lzjb", lzjb_decompress}, /* ZIO_COMPRESS_LZJB */ 78a6f561b4SSašo Kiselkov {"empty", 0}, /* ZIO_COMPRESS_EMPTY */ 79a6f561b4SSašo Kiselkov {"gzip-1", 0}, /* ZIO_COMPRESS_GZIP_1 */ 80a6f561b4SSašo Kiselkov {"gzip-2", 0}, /* ZIO_COMPRESS_GZIP_2 */ 81a6f561b4SSašo Kiselkov {"gzip-3", 0}, /* ZIO_COMPRESS_GZIP_3 */ 82a6f561b4SSašo Kiselkov {"gzip-4", 0}, /* ZIO_COMPRESS_GZIP_4 */ 83a6f561b4SSašo Kiselkov {"gzip-5", 0}, /* ZIO_COMPRESS_GZIP_5 */ 84a6f561b4SSašo Kiselkov {"gzip-6", 0}, /* ZIO_COMPRESS_GZIP_6 */ 85a6f561b4SSašo Kiselkov {"gzip-7", 0}, /* ZIO_COMPRESS_GZIP_7 */ 86a6f561b4SSašo Kiselkov {"gzip-8", 0}, /* ZIO_COMPRESS_GZIP_8 */ 87a6f561b4SSašo Kiselkov {"gzip-9", 0}, /* ZIO_COMPRESS_GZIP_9 */ 88a6f561b4SSašo Kiselkov {"zle", 0}, /* ZIO_COMPRESS_ZLE */ 89a6f561b4SSašo Kiselkov {"lz4", lz4_decompress} /* ZIO_COMPRESS_LZ4 */ 90b1b8ab34Slling }; 91b1b8ab34Slling 92cd9c78d9SLin Ling static int zio_read_data(blkptr_t *bp, void *buf, char *stack); 93cd9c78d9SLin Ling 94b1b8ab34Slling /* 95b1b8ab34Slling * Our own version of bcmp(). 96b1b8ab34Slling */ 97b1b8ab34Slling static int 98b1b8ab34Slling zfs_bcmp(const void *s1, const void *s2, size_t n) 99b1b8ab34Slling { 100b1b8ab34Slling const uchar_t *ps1 = s1; 101b1b8ab34Slling const uchar_t *ps2 = s2; 102b1b8ab34Slling 103b1b8ab34Slling if (s1 != s2 && n != 0) { 104b1b8ab34Slling do { 105b1b8ab34Slling if (*ps1++ != *ps2++) 106b1b8ab34Slling return (1); 107b1b8ab34Slling } while (--n != 0); 108b1b8ab34Slling } 109b1b8ab34Slling 110b1b8ab34Slling return (0); 111b1b8ab34Slling } 112b1b8ab34Slling 113b1b8ab34Slling /* 114b1b8ab34Slling * Our own version of log2(). Same thing as highbit()-1. 115b1b8ab34Slling */ 116b1b8ab34Slling static int 117b1b8ab34Slling zfs_log2(uint64_t num) 118b1b8ab34Slling { 119b1b8ab34Slling int i = 0; 120b1b8ab34Slling 121b1b8ab34Slling while (num > 1) { 122b1b8ab34Slling i++; 123b1b8ab34Slling num = num >> 1; 124b1b8ab34Slling } 125b1b8ab34Slling 126b1b8ab34Slling return (i); 127b1b8ab34Slling } 128b1b8ab34Slling 129b1b8ab34Slling /* Checksum Functions */ 130b1b8ab34Slling static void 131b1b8ab34Slling zio_checksum_off(const void *buf, uint64_t size, zio_cksum_t *zcp) 132b1b8ab34Slling { 133b1b8ab34Slling ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0); 134b1b8ab34Slling } 135b1b8ab34Slling 136b1b8ab34Slling /* Checksum Table and Values */ 137b1b8ab34Slling zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = { 138ad135b5dSChristopher Siden {{NULL, NULL}, 0, 0, "inherit"}, 139ad135b5dSChristopher Siden {{NULL, NULL}, 0, 0, "on"}, 140ad135b5dSChristopher Siden {{zio_checksum_off, zio_checksum_off}, 0, 0, "off"}, 141ad135b5dSChristopher Siden {{zio_checksum_SHA256, zio_checksum_SHA256}, 1, 1, "label"}, 142ad135b5dSChristopher Siden {{zio_checksum_SHA256, zio_checksum_SHA256}, 1, 1, "gang_header"}, 143ad135b5dSChristopher Siden {{NULL, NULL}, 0, 0, "zilog"}, 144ad135b5dSChristopher Siden {{fletcher_2_native, fletcher_2_byteswap}, 0, 0, "fletcher2"}, 145ad135b5dSChristopher Siden {{fletcher_4_native, fletcher_4_byteswap}, 1, 0, "fletcher4"}, 146ad135b5dSChristopher Siden {{zio_checksum_SHA256, zio_checksum_SHA256}, 1, 0, "SHA256"}, 147ad135b5dSChristopher Siden {{NULL, NULL}, 0, 0, "zilog2"}, 148b1b8ab34Slling }; 149b1b8ab34Slling 150b1b8ab34Slling /* 151b1b8ab34Slling * zio_checksum_verify: Provides support for checksum verification. 152b1b8ab34Slling * 153b1b8ab34Slling * Fletcher2, Fletcher4, and SHA256 are supported. 154b1b8ab34Slling * 155b1b8ab34Slling * Return: 156b1b8ab34Slling * -1 = Failure 157b1b8ab34Slling * 0 = Success 158b1b8ab34Slling */ 159b1b8ab34Slling static int 160b1b8ab34Slling zio_checksum_verify(blkptr_t *bp, char *data, int size) 161b1b8ab34Slling { 162b1b8ab34Slling zio_cksum_t zc = bp->blk_cksum; 163cd9c78d9SLin Ling uint32_t checksum = BP_GET_CHECKSUM(bp); 164b1b8ab34Slling int byteswap = BP_SHOULD_BYTESWAP(bp); 1656e1f5caaSNeil Perrin zio_eck_t *zec = (zio_eck_t *)(data + size) - 1; 166b1b8ab34Slling zio_checksum_info_t *ci = &zio_checksum_table[checksum]; 167b1b8ab34Slling zio_cksum_t actual_cksum, expected_cksum; 168b1b8ab34Slling 169b1b8ab34Slling /* byteswap is not supported */ 170b1b8ab34Slling if (byteswap) 171b1b8ab34Slling return (-1); 172b1b8ab34Slling 173b1b8ab34Slling if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL) 174b1b8ab34Slling return (-1); 175b1b8ab34Slling 1766e1f5caaSNeil Perrin if (ci->ci_eck) { 1776e1f5caaSNeil Perrin expected_cksum = zec->zec_cksum; 1786e1f5caaSNeil Perrin zec->zec_cksum = zc; 179cd9c78d9SLin Ling ci->ci_func[0](data, size, &actual_cksum); 1806e1f5caaSNeil Perrin zec->zec_cksum = expected_cksum; 181b1b8ab34Slling zc = expected_cksum; 182b1b8ab34Slling 183b1b8ab34Slling } else { 184b1b8ab34Slling ci->ci_func[byteswap](data, size, &actual_cksum); 185b1b8ab34Slling } 186b1b8ab34Slling 187b1b8ab34Slling if ((actual_cksum.zc_word[0] - zc.zc_word[0]) | 188b1b8ab34Slling (actual_cksum.zc_word[1] - zc.zc_word[1]) | 189b1b8ab34Slling (actual_cksum.zc_word[2] - zc.zc_word[2]) | 190b1b8ab34Slling (actual_cksum.zc_word[3] - zc.zc_word[3])) 191b1b8ab34Slling return (-1); 192b1b8ab34Slling 193b1b8ab34Slling return (0); 194b1b8ab34Slling } 195b1b8ab34Slling 196b1b8ab34Slling /* 197e23347b1SEric Taylor * vdev_label_start returns the physical disk offset (in bytes) of 198e23347b1SEric Taylor * label "l". 199b1b8ab34Slling */ 200e7cbe64fSgw static uint64_t 201e23347b1SEric Taylor vdev_label_start(uint64_t psize, int l) 202b1b8ab34Slling { 203e23347b1SEric Taylor return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 204b1b8ab34Slling 0 : psize - VDEV_LABELS * sizeof (vdev_label_t))); 205b1b8ab34Slling } 206b1b8ab34Slling 207b1b8ab34Slling /* 208b1b8ab34Slling * vdev_uberblock_compare takes two uberblock structures and returns an integer 209b1b8ab34Slling * indicating the more recent of the two. 210b1b8ab34Slling * Return Value = 1 if ub2 is more recent 211b1b8ab34Slling * Return Value = -1 if ub1 is more recent 212b1b8ab34Slling * The most recent uberblock is determined using its transaction number and 213b1b8ab34Slling * timestamp. The uberblock with the highest transaction number is 214b1b8ab34Slling * considered "newer". If the transaction numbers of the two blocks match, the 215b1b8ab34Slling * timestamps are compared to determine the "newer" of the two. 216b1b8ab34Slling */ 217b1b8ab34Slling static int 218b1b8ab34Slling vdev_uberblock_compare(uberblock_t *ub1, uberblock_t *ub2) 219b1b8ab34Slling { 220b1b8ab34Slling if (ub1->ub_txg < ub2->ub_txg) 221b1b8ab34Slling return (-1); 222b1b8ab34Slling if (ub1->ub_txg > ub2->ub_txg) 223b1b8ab34Slling return (1); 224b1b8ab34Slling 225b1b8ab34Slling if (ub1->ub_timestamp < ub2->ub_timestamp) 226b1b8ab34Slling return (-1); 227b1b8ab34Slling if (ub1->ub_timestamp > ub2->ub_timestamp) 228b1b8ab34Slling return (1); 229b1b8ab34Slling 230b1b8ab34Slling return (0); 231b1b8ab34Slling } 232b1b8ab34Slling 233b1b8ab34Slling /* 234b1b8ab34Slling * Three pieces of information are needed to verify an uberblock: the magic 235b1b8ab34Slling * number, the version number, and the checksum. 236b1b8ab34Slling * 237b1b8ab34Slling * Return: 238b1b8ab34Slling * 0 - Success 239b1b8ab34Slling * -1 - Failure 240b1b8ab34Slling */ 241b1b8ab34Slling static int 24281b2d573SHans Rosenfeld uberblock_verify(uberblock_t *uber, uint64_t ub_size, uint64_t offset) 243b1b8ab34Slling { 244b1b8ab34Slling blkptr_t bp; 245b1b8ab34Slling 246b1b8ab34Slling BP_ZERO(&bp); 247b1b8ab34Slling BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 248b1b8ab34Slling BP_SET_BYTEORDER(&bp, ZFS_HOST_BYTEORDER); 249b1b8ab34Slling ZIO_SET_CHECKSUM(&bp.blk_cksum, offset, 0, 0, 0); 250b1b8ab34Slling 25181b2d573SHans Rosenfeld if (zio_checksum_verify(&bp, (char *)uber, ub_size) != 0) 252b1b8ab34Slling return (-1); 253b1b8ab34Slling 254b1b8ab34Slling if (uber->ub_magic == UBERBLOCK_MAGIC && 255ad135b5dSChristopher Siden SPA_VERSION_IS_SUPPORTED(uber->ub_version)) 256b1b8ab34Slling return (0); 257b1b8ab34Slling 258b1b8ab34Slling return (-1); 259b1b8ab34Slling } 260b1b8ab34Slling 261b1b8ab34Slling /* 262b1b8ab34Slling * Find the best uberblock. 263b1b8ab34Slling * Return: 264b1b8ab34Slling * Success - Pointer to the best uberblock. 265b1b8ab34Slling * Failure - NULL 266b1b8ab34Slling */ 26781b2d573SHans Rosenfeld static uberblock_t * 26881b2d573SHans Rosenfeld find_bestub(char *ub_array, uint64_t ashift, uint64_t sector) 269b1b8ab34Slling { 27081b2d573SHans Rosenfeld uberblock_t *ubbest = NULL; 27181b2d573SHans Rosenfeld uberblock_t *ubnext; 27281b2d573SHans Rosenfeld uint64_t offset, ub_size; 273e23347b1SEric Taylor int i; 274b1b8ab34Slling 27581b2d573SHans Rosenfeld ub_size = VDEV_UBERBLOCK_SIZE(ashift); 27681b2d573SHans Rosenfeld 27781b2d573SHans Rosenfeld for (i = 0; i < VDEV_UBERBLOCK_COUNT(ashift); i++) { 27881b2d573SHans Rosenfeld ubnext = (uberblock_t *)ub_array; 27981b2d573SHans Rosenfeld ub_array += ub_size; 280e23347b1SEric Taylor offset = (sector << SPA_MINBLOCKSHIFT) + 28181b2d573SHans Rosenfeld VDEV_UBERBLOCK_OFFSET(ashift, i); 28281b2d573SHans Rosenfeld 28381b2d573SHans Rosenfeld if (uberblock_verify(ubnext, ub_size, offset) != 0) 28481b2d573SHans Rosenfeld continue; 28581b2d573SHans Rosenfeld 28681b2d573SHans Rosenfeld if (ubbest == NULL || 28781b2d573SHans Rosenfeld vdev_uberblock_compare(ubnext, ubbest) > 0) 28881b2d573SHans Rosenfeld ubbest = ubnext; 289b1b8ab34Slling } 290b1b8ab34Slling 291b1b8ab34Slling return (ubbest); 292b1b8ab34Slling } 293b1b8ab34Slling 294b1b8ab34Slling /* 295cd9c78d9SLin Ling * Read a block of data based on the gang block address dva, 296cd9c78d9SLin Ling * and put its data in buf. 297b1b8ab34Slling * 298b1b8ab34Slling * Return: 299b1b8ab34Slling * 0 - success 300cd9c78d9SLin Ling * 1 - failure 301b1b8ab34Slling */ 302b1b8ab34Slling static int 303cd9c78d9SLin Ling zio_read_gang(blkptr_t *bp, dva_t *dva, void *buf, char *stack) 304b1b8ab34Slling { 305cd9c78d9SLin Ling zio_gbh_phys_t *zio_gb; 306b1b8ab34Slling uint64_t offset, sector; 307cd9c78d9SLin Ling blkptr_t tmpbp; 308cd9c78d9SLin Ling int i; 309b1b8ab34Slling 310cd9c78d9SLin Ling zio_gb = (zio_gbh_phys_t *)stack; 311cd9c78d9SLin Ling stack += SPA_GANGBLOCKSIZE; 312cd9c78d9SLin Ling offset = DVA_GET_OFFSET(dva); 313ad135b5dSChristopher Siden sector = DVA_OFFSET_TO_PHYS_SECTOR(offset); 314b1b8ab34Slling 315cd9c78d9SLin Ling /* read in the gang block header */ 316cd9c78d9SLin Ling if (devread(sector, 0, SPA_GANGBLOCKSIZE, (char *)zio_gb) == 0) { 317cd9c78d9SLin Ling grub_printf("failed to read in a gang block header\n"); 318cd9c78d9SLin Ling return (1); 319cd9c78d9SLin Ling } 320cd9c78d9SLin Ling 321cd9c78d9SLin Ling /* self checksuming the gang block header */ 322cd9c78d9SLin Ling BP_ZERO(&tmpbp); 323cd9c78d9SLin Ling BP_SET_CHECKSUM(&tmpbp, ZIO_CHECKSUM_GANG_HEADER); 324cd9c78d9SLin Ling BP_SET_BYTEORDER(&tmpbp, ZFS_HOST_BYTEORDER); 325cd9c78d9SLin Ling ZIO_SET_CHECKSUM(&tmpbp.blk_cksum, DVA_GET_VDEV(dva), 326cd9c78d9SLin Ling DVA_GET_OFFSET(dva), bp->blk_birth, 0); 327cd9c78d9SLin Ling if (zio_checksum_verify(&tmpbp, (char *)zio_gb, SPA_GANGBLOCKSIZE)) { 328cd9c78d9SLin Ling grub_printf("failed to checksum a gang block header\n"); 329cd9c78d9SLin Ling return (1); 330cd9c78d9SLin Ling } 331cd9c78d9SLin Ling 332cd9c78d9SLin Ling for (i = 0; i < SPA_GBH_NBLKPTRS; i++) { 333*43466aaeSMax Grossman if (BP_IS_HOLE(&zio_gb->zg_blkptr[i])) 334cd9c78d9SLin Ling continue; 335cd9c78d9SLin Ling 336cd9c78d9SLin Ling if (zio_read_data(&zio_gb->zg_blkptr[i], buf, stack)) 337cd9c78d9SLin Ling return (1); 338cd9c78d9SLin Ling buf += BP_GET_PSIZE(&zio_gb->zg_blkptr[i]); 339cd9c78d9SLin Ling } 340cd9c78d9SLin Ling 341cd9c78d9SLin Ling return (0); 342cd9c78d9SLin Ling } 343cd9c78d9SLin Ling 344cd9c78d9SLin Ling /* 345cd9c78d9SLin Ling * Read in a block of raw data to buf. 346cd9c78d9SLin Ling * 347cd9c78d9SLin Ling * Return: 348cd9c78d9SLin Ling * 0 - success 349cd9c78d9SLin Ling * 1 - failure 350cd9c78d9SLin Ling */ 351cd9c78d9SLin Ling static int 352cd9c78d9SLin Ling zio_read_data(blkptr_t *bp, void *buf, char *stack) 353cd9c78d9SLin Ling { 354cd9c78d9SLin Ling int i, psize; 355cd9c78d9SLin Ling 356cd9c78d9SLin Ling psize = BP_GET_PSIZE(bp); 357ae8180dbSlling 358b1b8ab34Slling /* pick a good dva from the block pointer */ 359b1b8ab34Slling for (i = 0; i < SPA_DVAS_PER_BP; i++) { 360cd9c78d9SLin Ling uint64_t offset, sector; 361b1b8ab34Slling 362b1b8ab34Slling if (bp->blk_dva[i].dva_word[0] == 0 && 363b1b8ab34Slling bp->blk_dva[i].dva_word[1] == 0) 364b1b8ab34Slling continue; 365b1b8ab34Slling 366cd9c78d9SLin Ling if (DVA_GET_GANG(&bp->blk_dva[i])) { 367cd9c78d9SLin Ling if (zio_read_gang(bp, &bp->blk_dva[i], buf, stack) == 0) 368cd9c78d9SLin Ling return (0); 369b1b8ab34Slling } else { 370cd9c78d9SLin Ling /* read in a data block */ 371cd9c78d9SLin Ling offset = DVA_GET_OFFSET(&bp->blk_dva[i]); 372ad135b5dSChristopher Siden sector = DVA_OFFSET_TO_PHYS_SECTOR(offset); 373ad135b5dSChristopher Siden if (devread(sector, 0, psize, buf) != 0) 374cd9c78d9SLin Ling return (0); 375b1b8ab34Slling } 376b1b8ab34Slling } 377b1b8ab34Slling 378cd9c78d9SLin Ling return (1); 379cd9c78d9SLin Ling } 380cd9c78d9SLin Ling 381cd9c78d9SLin Ling /* 382cd9c78d9SLin Ling * Read in a block of data, verify its checksum, decompress if needed, 383cd9c78d9SLin Ling * and put the uncompressed data in buf. 384cd9c78d9SLin Ling * 385cd9c78d9SLin Ling * Return: 386cd9c78d9SLin Ling * 0 - success 387cd9c78d9SLin Ling * errnum - failure 388cd9c78d9SLin Ling */ 389cd9c78d9SLin Ling static int 390cd9c78d9SLin Ling zio_read(blkptr_t *bp, void *buf, char *stack) 391cd9c78d9SLin Ling { 392cd9c78d9SLin Ling int lsize, psize, comp; 393cd9c78d9SLin Ling char *retbuf; 394cd9c78d9SLin Ling 395cd9c78d9SLin Ling comp = BP_GET_COMPRESS(bp); 396cd9c78d9SLin Ling lsize = BP_GET_LSIZE(bp); 397cd9c78d9SLin Ling psize = BP_GET_PSIZE(bp); 398cd9c78d9SLin Ling 399cd9c78d9SLin Ling if ((unsigned int)comp >= ZIO_COMPRESS_FUNCTIONS || 400cd9c78d9SLin Ling (comp != ZIO_COMPRESS_OFF && 401cd9c78d9SLin Ling decomp_table[comp].decomp_func == NULL)) { 402cd9c78d9SLin Ling grub_printf("compression algorithm not supported\n"); 403cd9c78d9SLin Ling return (ERR_FSYS_CORRUPT); 404cd9c78d9SLin Ling } 405cd9c78d9SLin Ling 406cd9c78d9SLin Ling if ((char *)buf < stack && ((char *)buf) + lsize > stack) { 407cd9c78d9SLin Ling grub_printf("not enough memory allocated\n"); 408cd9c78d9SLin Ling return (ERR_WONT_FIT); 409cd9c78d9SLin Ling } 410cd9c78d9SLin Ling 411cd9c78d9SLin Ling retbuf = buf; 412cd9c78d9SLin Ling if (comp != ZIO_COMPRESS_OFF) { 413cd9c78d9SLin Ling buf = stack; 414cd9c78d9SLin Ling stack += psize; 415cd9c78d9SLin Ling } 416cd9c78d9SLin Ling 417ad135b5dSChristopher Siden if (zio_read_data(bp, buf, stack) != 0) { 418cd9c78d9SLin Ling grub_printf("zio_read_data failed\n"); 419cd9c78d9SLin Ling return (ERR_FSYS_CORRUPT); 420cd9c78d9SLin Ling } 421cd9c78d9SLin Ling 422cd9c78d9SLin Ling if (zio_checksum_verify(bp, buf, psize) != 0) { 423cd9c78d9SLin Ling grub_printf("checksum verification failed\n"); 424cd9c78d9SLin Ling return (ERR_FSYS_CORRUPT); 425cd9c78d9SLin Ling } 426cd9c78d9SLin Ling 427a6f561b4SSašo Kiselkov if (comp != ZIO_COMPRESS_OFF) { 428a6f561b4SSašo Kiselkov if (decomp_table[comp].decomp_func(buf, retbuf, psize, 429a6f561b4SSašo Kiselkov lsize) != 0) { 430a6f561b4SSašo Kiselkov grub_printf("zio_read decompression failed\n"); 431a6f561b4SSašo Kiselkov return (ERR_FSYS_CORRUPT); 432a6f561b4SSašo Kiselkov } 433a6f561b4SSašo Kiselkov } 434cd9c78d9SLin Ling 435cd9c78d9SLin Ling return (0); 436b1b8ab34Slling } 437b1b8ab34Slling 438b1b8ab34Slling /* 439b1b8ab34Slling * Get the block from a block id. 440b1b8ab34Slling * push the block onto the stack. 441b1b8ab34Slling * 442b1b8ab34Slling * Return: 443b1b8ab34Slling * 0 - success 444b1b8ab34Slling * errnum - failure 445b1b8ab34Slling */ 446b1b8ab34Slling static int 447b1b8ab34Slling dmu_read(dnode_phys_t *dn, uint64_t blkid, void *buf, char *stack) 448b1b8ab34Slling { 449b1b8ab34Slling int idx, level; 450b1b8ab34Slling blkptr_t *bp_array = dn->dn_blkptr; 451b1b8ab34Slling int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 452b1b8ab34Slling blkptr_t *bp, *tmpbuf; 453b1b8ab34Slling 454b1b8ab34Slling bp = (blkptr_t *)stack; 455b1b8ab34Slling stack += sizeof (blkptr_t); 456b1b8ab34Slling 457b1b8ab34Slling tmpbuf = (blkptr_t *)stack; 458b1b8ab34Slling stack += 1<<dn->dn_indblkshift; 459b1b8ab34Slling 460b1b8ab34Slling for (level = dn->dn_nlevels - 1; level >= 0; level--) { 461b1b8ab34Slling idx = (blkid >> (epbs * level)) & ((1<<epbs)-1); 462b1b8ab34Slling *bp = bp_array[idx]; 463b1b8ab34Slling if (level == 0) 464b1b8ab34Slling tmpbuf = buf; 465ae8180dbSlling if (BP_IS_HOLE(bp)) { 466ae8180dbSlling grub_memset(buf, 0, 467ae8180dbSlling dn->dn_datablkszsec << SPA_MINBLOCKSHIFT); 468ae8180dbSlling break; 469ae8180dbSlling } else if (errnum = zio_read(bp, tmpbuf, stack)) { 470b1b8ab34Slling return (errnum); 471ae8180dbSlling } 472b1b8ab34Slling 473b1b8ab34Slling bp_array = tmpbuf; 474b1b8ab34Slling } 475b1b8ab34Slling 476b1b8ab34Slling return (0); 477b1b8ab34Slling } 478b1b8ab34Slling 479b1b8ab34Slling /* 480b1b8ab34Slling * mzap_lookup: Looks up property described by "name" and returns the value 481b1b8ab34Slling * in "value". 482b1b8ab34Slling * 483b1b8ab34Slling * Return: 484b1b8ab34Slling * 0 - success 485b1b8ab34Slling * errnum - failure 486b1b8ab34Slling */ 487b1b8ab34Slling static int 488ad135b5dSChristopher Siden mzap_lookup(mzap_phys_t *zapobj, int objsize, const char *name, 489b1b8ab34Slling uint64_t *value) 490b1b8ab34Slling { 491b1b8ab34Slling int i, chunks; 492b1b8ab34Slling mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk; 493b1b8ab34Slling 494ad135b5dSChristopher Siden chunks = objsize / MZAP_ENT_LEN - 1; 495b1b8ab34Slling for (i = 0; i < chunks; i++) { 496b1b8ab34Slling if (grub_strcmp(mzap_ent[i].mze_name, name) == 0) { 497b1b8ab34Slling *value = mzap_ent[i].mze_value; 498b1b8ab34Slling return (0); 499b1b8ab34Slling } 500b1b8ab34Slling } 501b1b8ab34Slling 502b1b8ab34Slling return (ERR_FSYS_CORRUPT); 503b1b8ab34Slling } 504b1b8ab34Slling 505b1b8ab34Slling static uint64_t 506b1b8ab34Slling zap_hash(uint64_t salt, const char *name) 507b1b8ab34Slling { 508b1b8ab34Slling static uint64_t table[256]; 509b1b8ab34Slling const uint8_t *cp; 510b1b8ab34Slling uint8_t c; 511b1b8ab34Slling uint64_t crc = salt; 512b1b8ab34Slling 513b1b8ab34Slling if (table[128] == 0) { 514b1b8ab34Slling uint64_t *ct; 515b1b8ab34Slling int i, j; 516b1b8ab34Slling for (i = 0; i < 256; i++) { 517b1b8ab34Slling for (ct = table + i, *ct = i, j = 8; j > 0; j--) 518b1b8ab34Slling *ct = (*ct >> 1) ^ (-(*ct & 1) & 519b1b8ab34Slling ZFS_CRC64_POLY); 520b1b8ab34Slling } 521b1b8ab34Slling } 522b1b8ab34Slling 523b1b8ab34Slling if (crc == 0 || table[128] != ZFS_CRC64_POLY) { 524b1b8ab34Slling errnum = ERR_FSYS_CORRUPT; 525b1b8ab34Slling return (0); 526b1b8ab34Slling } 527b1b8ab34Slling 528b1b8ab34Slling for (cp = (const uint8_t *)name; (c = *cp) != '\0'; cp++) 529b1b8ab34Slling crc = (crc >> 8) ^ table[(crc ^ c) & 0xFF]; 530b1b8ab34Slling 531b1b8ab34Slling /* 532b1b8ab34Slling * Only use 28 bits, since we need 4 bits in the cookie for the 533b1b8ab34Slling * collision differentiator. We MUST use the high bits, since 534ad135b5dSChristopher Siden * those are the ones that we first pay attention to when 535ad135b5dSChristopher Siden * choosing the bucket. 536b1b8ab34Slling */ 537b24ab676SJeff Bonwick crc &= ~((1ULL << (64 - 28)) - 1); 538b1b8ab34Slling 539b1b8ab34Slling return (crc); 540b1b8ab34Slling } 541b1b8ab34Slling 542b1b8ab34Slling /* 543b1b8ab34Slling * Only to be used on 8-bit arrays. 544b1b8ab34Slling * array_len is actual len in bytes (not encoded le_value_length). 545b1b8ab34Slling * buf is null-terminated. 546b1b8ab34Slling */ 547b1b8ab34Slling static int 548b1b8ab34Slling zap_leaf_array_equal(zap_leaf_phys_t *l, int blksft, int chunk, 549b1b8ab34Slling int array_len, const char *buf) 550b1b8ab34Slling { 551b1b8ab34Slling int bseen = 0; 552b1b8ab34Slling 553b1b8ab34Slling while (bseen < array_len) { 554b1b8ab34Slling struct zap_leaf_array *la = 555b1b8ab34Slling &ZAP_LEAF_CHUNK(l, blksft, chunk).l_array; 556b1b8ab34Slling int toread = MIN(array_len - bseen, ZAP_LEAF_ARRAY_BYTES); 557b1b8ab34Slling 558b1b8ab34Slling if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) 559b1b8ab34Slling return (0); 560b1b8ab34Slling 561b1b8ab34Slling if (zfs_bcmp(la->la_array, buf + bseen, toread) != 0) 562b1b8ab34Slling break; 563b1b8ab34Slling chunk = la->la_next; 564b1b8ab34Slling bseen += toread; 565b1b8ab34Slling } 566b1b8ab34Slling return (bseen == array_len); 567b1b8ab34Slling } 568b1b8ab34Slling 569b1b8ab34Slling /* 570b1b8ab34Slling * Given a zap_leaf_phys_t, walk thru the zap leaf chunks to get the 571b1b8ab34Slling * value for the property "name". 572b1b8ab34Slling * 573b1b8ab34Slling * Return: 574b1b8ab34Slling * 0 - success 575b1b8ab34Slling * errnum - failure 576b1b8ab34Slling */ 577e7cbe64fSgw static int 578b1b8ab34Slling zap_leaf_lookup(zap_leaf_phys_t *l, int blksft, uint64_t h, 579b1b8ab34Slling const char *name, uint64_t *value) 580b1b8ab34Slling { 581b1b8ab34Slling uint16_t chunk; 582b1b8ab34Slling struct zap_leaf_entry *le; 583b1b8ab34Slling 584b1b8ab34Slling /* Verify if this is a valid leaf block */ 585b1b8ab34Slling if (l->l_hdr.lh_block_type != ZBT_LEAF) 586b1b8ab34Slling return (ERR_FSYS_CORRUPT); 587b1b8ab34Slling if (l->l_hdr.lh_magic != ZAP_LEAF_MAGIC) 588b1b8ab34Slling return (ERR_FSYS_CORRUPT); 589b1b8ab34Slling 590b1b8ab34Slling for (chunk = l->l_hash[LEAF_HASH(blksft, h)]; 591b1b8ab34Slling chunk != CHAIN_END; chunk = le->le_next) { 592b1b8ab34Slling 593b1b8ab34Slling if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) 594b1b8ab34Slling return (ERR_FSYS_CORRUPT); 595b1b8ab34Slling 596b1b8ab34Slling le = ZAP_LEAF_ENTRY(l, blksft, chunk); 597b1b8ab34Slling 598b1b8ab34Slling /* Verify the chunk entry */ 599b1b8ab34Slling if (le->le_type != ZAP_CHUNK_ENTRY) 600b1b8ab34Slling return (ERR_FSYS_CORRUPT); 601b1b8ab34Slling 602b1b8ab34Slling if (le->le_hash != h) 603b1b8ab34Slling continue; 604b1b8ab34Slling 605b1b8ab34Slling if (zap_leaf_array_equal(l, blksft, le->le_name_chunk, 606b1b8ab34Slling le->le_name_length, name)) { 607b1b8ab34Slling 608b1b8ab34Slling struct zap_leaf_array *la; 609b1b8ab34Slling uint8_t *ip; 610b1b8ab34Slling 611b1b8ab34Slling if (le->le_int_size != 8 || le->le_value_length != 1) 612e37b211cStaylor return (ERR_FSYS_CORRUPT); 613b1b8ab34Slling 614b1b8ab34Slling /* get the uint64_t property value */ 615b1b8ab34Slling la = &ZAP_LEAF_CHUNK(l, blksft, 616b1b8ab34Slling le->le_value_chunk).l_array; 617b1b8ab34Slling ip = la->la_array; 618b1b8ab34Slling 619b1b8ab34Slling *value = (uint64_t)ip[0] << 56 | (uint64_t)ip[1] << 48 | 620b1b8ab34Slling (uint64_t)ip[2] << 40 | (uint64_t)ip[3] << 32 | 621b1b8ab34Slling (uint64_t)ip[4] << 24 | (uint64_t)ip[5] << 16 | 622b1b8ab34Slling (uint64_t)ip[6] << 8 | (uint64_t)ip[7]; 623b1b8ab34Slling 624b1b8ab34Slling return (0); 625b1b8ab34Slling } 626b1b8ab34Slling } 627b1b8ab34Slling 628b1b8ab34Slling return (ERR_FSYS_CORRUPT); 629b1b8ab34Slling } 630b1b8ab34Slling 631b1b8ab34Slling /* 632b1b8ab34Slling * Fat ZAP lookup 633b1b8ab34Slling * 634b1b8ab34Slling * Return: 635b1b8ab34Slling * 0 - success 636b1b8ab34Slling * errnum - failure 637b1b8ab34Slling */ 638e7cbe64fSgw static int 639b1b8ab34Slling fzap_lookup(dnode_phys_t *zap_dnode, zap_phys_t *zap, 640ad135b5dSChristopher Siden const char *name, uint64_t *value, char *stack) 641b1b8ab34Slling { 642b1b8ab34Slling zap_leaf_phys_t *l; 643b1b8ab34Slling uint64_t hash, idx, blkid; 644b1b8ab34Slling int blksft = zfs_log2(zap_dnode->dn_datablkszsec << DNODE_SHIFT); 645b1b8ab34Slling 646b1b8ab34Slling /* Verify if this is a fat zap header block */ 647b24ab676SJeff Bonwick if (zap->zap_magic != (uint64_t)ZAP_MAGIC || 648b24ab676SJeff Bonwick zap->zap_flags != 0) 649b1b8ab34Slling return (ERR_FSYS_CORRUPT); 650b1b8ab34Slling 651b1b8ab34Slling hash = zap_hash(zap->zap_salt, name); 652b1b8ab34Slling if (errnum) 653b1b8ab34Slling return (errnum); 654b1b8ab34Slling 655b1b8ab34Slling /* get block id from index */ 656b1b8ab34Slling if (zap->zap_ptrtbl.zt_numblks != 0) { 657b1b8ab34Slling /* external pointer tables not supported */ 658b1b8ab34Slling return (ERR_FSYS_CORRUPT); 659b1b8ab34Slling } 660b1b8ab34Slling idx = ZAP_HASH_IDX(hash, zap->zap_ptrtbl.zt_shift); 661b1b8ab34Slling blkid = ((uint64_t *)zap)[idx + (1<<(blksft-3-1))]; 662b1b8ab34Slling 663b1b8ab34Slling /* Get the leaf block */ 664b1b8ab34Slling l = (zap_leaf_phys_t *)stack; 665b1b8ab34Slling stack += 1<<blksft; 666051aabe6Staylor if ((1<<blksft) < sizeof (zap_leaf_phys_t)) 667e37b211cStaylor return (ERR_FSYS_CORRUPT); 668b1b8ab34Slling if (errnum = dmu_read(zap_dnode, blkid, l, stack)) 669b1b8ab34Slling return (errnum); 670b1b8ab34Slling 671b1b8ab34Slling return (zap_leaf_lookup(l, blksft, hash, name, value)); 672b1b8ab34Slling } 673b1b8ab34Slling 674b1b8ab34Slling /* 675b1b8ab34Slling * Read in the data of a zap object and find the value for a matching 676b1b8ab34Slling * property name. 677b1b8ab34Slling * 678b1b8ab34Slling * Return: 679b1b8ab34Slling * 0 - success 680b1b8ab34Slling * errnum - failure 681b1b8ab34Slling */ 682b1b8ab34Slling static int 683ad135b5dSChristopher Siden zap_lookup(dnode_phys_t *zap_dnode, const char *name, uint64_t *val, 684ad135b5dSChristopher Siden char *stack) 685b1b8ab34Slling { 686b1b8ab34Slling uint64_t block_type; 687b1b8ab34Slling int size; 688b1b8ab34Slling void *zapbuf; 689b1b8ab34Slling 690b1b8ab34Slling /* Read in the first block of the zap object data. */ 691b1b8ab34Slling zapbuf = stack; 692b1b8ab34Slling size = zap_dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 693b1b8ab34Slling stack += size; 6940a586ceaSMark Shellenbaum 695ad135b5dSChristopher Siden if ((errnum = dmu_read(zap_dnode, 0, zapbuf, stack)) != 0) 696b1b8ab34Slling return (errnum); 697b1b8ab34Slling 698b1b8ab34Slling block_type = *((uint64_t *)zapbuf); 699b1b8ab34Slling 700b1b8ab34Slling if (block_type == ZBT_MICRO) { 701b1b8ab34Slling return (mzap_lookup(zapbuf, size, name, val)); 702b1b8ab34Slling } else if (block_type == ZBT_HEADER) { 703b1b8ab34Slling /* this is a fat zap */ 704b1b8ab34Slling return (fzap_lookup(zap_dnode, zapbuf, name, 705b1b8ab34Slling val, stack)); 706b1b8ab34Slling } 707b1b8ab34Slling 708b1b8ab34Slling return (ERR_FSYS_CORRUPT); 709b1b8ab34Slling } 710b1b8ab34Slling 711ad135b5dSChristopher Siden typedef struct zap_attribute { 712ad135b5dSChristopher Siden int za_integer_length; 713ad135b5dSChristopher Siden uint64_t za_num_integers; 714ad135b5dSChristopher Siden uint64_t za_first_integer; 715ad135b5dSChristopher Siden char *za_name; 716ad135b5dSChristopher Siden } zap_attribute_t; 717ad135b5dSChristopher Siden 718ad135b5dSChristopher Siden typedef int (zap_cb_t)(zap_attribute_t *za, void *arg, char *stack); 719ad135b5dSChristopher Siden 720ad135b5dSChristopher Siden static int 721ad135b5dSChristopher Siden zap_iterate(dnode_phys_t *zap_dnode, zap_cb_t *cb, void *arg, char *stack) 722ad135b5dSChristopher Siden { 723ad135b5dSChristopher Siden uint32_t size = zap_dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 724ad135b5dSChristopher Siden zap_attribute_t za; 725ad135b5dSChristopher Siden int i; 726ad135b5dSChristopher Siden mzap_phys_t *mzp = (mzap_phys_t *)stack; 727ad135b5dSChristopher Siden stack += size; 728ad135b5dSChristopher Siden 729ad135b5dSChristopher Siden if ((errnum = dmu_read(zap_dnode, 0, mzp, stack)) != 0) 730ad135b5dSChristopher Siden return (errnum); 731ad135b5dSChristopher Siden 732ad135b5dSChristopher Siden /* 733ad135b5dSChristopher Siden * Iteration over fatzap objects has not yet been implemented. 734ad135b5dSChristopher Siden * If we encounter a pool in which there are more features for 735ad135b5dSChristopher Siden * read than can fit inside a microzap (i.e., more than 2048 736ad135b5dSChristopher Siden * features for read), we can add support for fatzap iteration. 737ad135b5dSChristopher Siden * For now, fail. 738ad135b5dSChristopher Siden */ 739ad135b5dSChristopher Siden if (mzp->mz_block_type != ZBT_MICRO) { 740ad135b5dSChristopher Siden grub_printf("feature information stored in fatzap, pool " 741ad135b5dSChristopher Siden "version not supported\n"); 742ad135b5dSChristopher Siden return (1); 743ad135b5dSChristopher Siden } 744ad135b5dSChristopher Siden 745ad135b5dSChristopher Siden za.za_integer_length = 8; 746ad135b5dSChristopher Siden za.za_num_integers = 1; 747ad135b5dSChristopher Siden for (i = 0; i < size / MZAP_ENT_LEN - 1; i++) { 748ad135b5dSChristopher Siden mzap_ent_phys_t *mzep = &mzp->mz_chunk[i]; 749ad135b5dSChristopher Siden int err; 750ad135b5dSChristopher Siden 751ad135b5dSChristopher Siden za.za_first_integer = mzep->mze_value; 752ad135b5dSChristopher Siden za.za_name = mzep->mze_name; 753ad135b5dSChristopher Siden err = cb(&za, arg, stack); 754ad135b5dSChristopher Siden if (err != 0) 755ad135b5dSChristopher Siden return (err); 756ad135b5dSChristopher Siden } 757ad135b5dSChristopher Siden 758ad135b5dSChristopher Siden return (0); 759ad135b5dSChristopher Siden } 760ad135b5dSChristopher Siden 761b1b8ab34Slling /* 762b1b8ab34Slling * Get the dnode of an object number from the metadnode of an object set. 763b1b8ab34Slling * 764b1b8ab34Slling * Input 765b1b8ab34Slling * mdn - metadnode to get the object dnode 766b1b8ab34Slling * objnum - object number for the object dnode 767b1b8ab34Slling * buf - data buffer that holds the returning dnode 768b1b8ab34Slling * stack - scratch area 769b1b8ab34Slling * 770b1b8ab34Slling * Return: 771b1b8ab34Slling * 0 - success 772b1b8ab34Slling * errnum - failure 773b1b8ab34Slling */ 774b1b8ab34Slling static int 775b1b8ab34Slling dnode_get(dnode_phys_t *mdn, uint64_t objnum, uint8_t type, dnode_phys_t *buf, 776b1b8ab34Slling char *stack) 777b1b8ab34Slling { 778b1b8ab34Slling uint64_t blkid, blksz; /* the block id this object dnode is in */ 779b1b8ab34Slling int epbs; /* shift of number of dnodes in a block */ 780b1b8ab34Slling int idx; /* index within a block */ 781b1b8ab34Slling dnode_phys_t *dnbuf; 782b1b8ab34Slling 783b1b8ab34Slling blksz = mdn->dn_datablkszsec << SPA_MINBLOCKSHIFT; 784b1b8ab34Slling epbs = zfs_log2(blksz) - DNODE_SHIFT; 785b1b8ab34Slling blkid = objnum >> epbs; 786b1b8ab34Slling idx = objnum & ((1<<epbs)-1); 787b1b8ab34Slling 788b1b8ab34Slling if (dnode_buf != NULL && dnode_mdn == mdn && 789b1b8ab34Slling objnum >= dnode_start && objnum < dnode_end) { 790b1b8ab34Slling grub_memmove(buf, &dnode_buf[idx], DNODE_SIZE); 791b1b8ab34Slling VERIFY_DN_TYPE(buf, type); 792b1b8ab34Slling return (0); 793b1b8ab34Slling } 794b1b8ab34Slling 795b1b8ab34Slling if (dnode_buf && blksz == 1<<DNODE_BLOCK_SHIFT) { 796b1b8ab34Slling dnbuf = dnode_buf; 797b1b8ab34Slling dnode_mdn = mdn; 798b1b8ab34Slling dnode_start = blkid << epbs; 799b1b8ab34Slling dnode_end = (blkid + 1) << epbs; 800b1b8ab34Slling } else { 801b1b8ab34Slling dnbuf = (dnode_phys_t *)stack; 802b1b8ab34Slling stack += blksz; 803b1b8ab34Slling } 804b1b8ab34Slling 805b1b8ab34Slling if (errnum = dmu_read(mdn, blkid, (char *)dnbuf, stack)) 806b1b8ab34Slling return (errnum); 807b1b8ab34Slling 808b1b8ab34Slling grub_memmove(buf, &dnbuf[idx], DNODE_SIZE); 809b1b8ab34Slling VERIFY_DN_TYPE(buf, type); 810b1b8ab34Slling 811b1b8ab34Slling return (0); 812b1b8ab34Slling } 813b1b8ab34Slling 814b1b8ab34Slling /* 815eb2bd662Svikram * Check if this is a special file that resides at the top 816eb2bd662Svikram * dataset of the pool. Currently this is the GRUB menu, 817eb2bd662Svikram * boot signature and boot signature backup. 818b1b8ab34Slling * str starts with '/'. 819b1b8ab34Slling */ 820b1b8ab34Slling static int 821eb2bd662Svikram is_top_dataset_file(char *str) 822b1b8ab34Slling { 823b1b8ab34Slling char *tptr; 824b1b8ab34Slling 825b1b8ab34Slling if ((tptr = grub_strstr(str, "menu.lst")) && 826b1b8ab34Slling (tptr[8] == '\0' || tptr[8] == ' ') && 827b1b8ab34Slling *(tptr-1) == '/') 828b1b8ab34Slling return (1); 829b1b8ab34Slling 830eb2bd662Svikram if (grub_strncmp(str, BOOTSIGN_DIR"/", 8311183b401Svikram grub_strlen(BOOTSIGN_DIR) + 1) == 0) 832eb2bd662Svikram return (1); 833eb2bd662Svikram 834eb2bd662Svikram if (grub_strcmp(str, BOOTSIGN_BACKUP) == 0) 835eb2bd662Svikram return (1); 836eb2bd662Svikram 837b1b8ab34Slling return (0); 838b1b8ab34Slling } 839b1b8ab34Slling 840ad135b5dSChristopher Siden static int 841ad135b5dSChristopher Siden check_feature(zap_attribute_t *za, void *arg, char *stack) 842ad135b5dSChristopher Siden { 843ad135b5dSChristopher Siden const char **names = arg; 844ad135b5dSChristopher Siden int i; 845ad135b5dSChristopher Siden 846ad135b5dSChristopher Siden if (za->za_first_integer == 0) 847ad135b5dSChristopher Siden return (0); 848ad135b5dSChristopher Siden 849ad135b5dSChristopher Siden for (i = 0; names[i] != NULL; i++) { 850ad135b5dSChristopher Siden if (grub_strcmp(za->za_name, names[i]) == 0) { 851ad135b5dSChristopher Siden return (0); 852ad135b5dSChristopher Siden } 853ad135b5dSChristopher Siden } 854ad135b5dSChristopher Siden grub_printf("missing feature for read '%s'\n", za->za_name); 855ad135b5dSChristopher Siden return (ERR_NEWER_VERSION); 856ad135b5dSChristopher Siden } 857ad135b5dSChristopher Siden 858b1b8ab34Slling /* 859b1b8ab34Slling * Get the file dnode for a given file name where mdn is the meta dnode 860b1b8ab34Slling * for this ZFS object set. When found, place the file dnode in dn. 861b1b8ab34Slling * The 'path' argument will be mangled. 862b1b8ab34Slling * 863b1b8ab34Slling * Return: 864b1b8ab34Slling * 0 - success 865b1b8ab34Slling * errnum - failure 866b1b8ab34Slling */ 867b1b8ab34Slling static int 868b1b8ab34Slling dnode_get_path(dnode_phys_t *mdn, char *path, dnode_phys_t *dn, 869b1b8ab34Slling char *stack) 870b1b8ab34Slling { 871e7437265Sahrens uint64_t objnum, version; 872b1b8ab34Slling char *cname, ch; 873b1b8ab34Slling 874b1b8ab34Slling if (errnum = dnode_get(mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE, 875b1b8ab34Slling dn, stack)) 876b1b8ab34Slling return (errnum); 877b1b8ab34Slling 878e7437265Sahrens if (errnum = zap_lookup(dn, ZPL_VERSION_STR, &version, stack)) 879e7437265Sahrens return (errnum); 880e7437265Sahrens if (version > ZPL_VERSION) 881e7437265Sahrens return (-1); 882e7437265Sahrens 883b1b8ab34Slling if (errnum = zap_lookup(dn, ZFS_ROOT_OBJ, &objnum, stack)) 884b1b8ab34Slling return (errnum); 885b1b8ab34Slling 886b1b8ab34Slling if (errnum = dnode_get(mdn, objnum, DMU_OT_DIRECTORY_CONTENTS, 887b1b8ab34Slling dn, stack)) 888b1b8ab34Slling return (errnum); 889b1b8ab34Slling 890b1b8ab34Slling /* skip leading slashes */ 891b1b8ab34Slling while (*path == '/') 892b1b8ab34Slling path++; 893b1b8ab34Slling 894ad135b5dSChristopher Siden while (*path && !grub_isspace(*path)) { 895b1b8ab34Slling 896b1b8ab34Slling /* get the next component name */ 897b1b8ab34Slling cname = path; 898ad135b5dSChristopher Siden while (*path && !grub_isspace(*path) && *path != '/') 899b1b8ab34Slling path++; 900b1b8ab34Slling ch = *path; 901b1b8ab34Slling *path = 0; /* ensure null termination */ 902b1b8ab34Slling 903b1b8ab34Slling if (errnum = zap_lookup(dn, cname, &objnum, stack)) 904b1b8ab34Slling return (errnum); 905b1b8ab34Slling 906e7437265Sahrens objnum = ZFS_DIRENT_OBJ(objnum); 907b1b8ab34Slling if (errnum = dnode_get(mdn, objnum, 0, dn, stack)) 908b1b8ab34Slling return (errnum); 909b1b8ab34Slling 910b1b8ab34Slling *path = ch; 911b1b8ab34Slling while (*path == '/') 912b1b8ab34Slling path++; 913b1b8ab34Slling } 914b1b8ab34Slling 915b1b8ab34Slling /* We found the dnode for this file. Verify if it is a plain file. */ 916b1b8ab34Slling VERIFY_DN_TYPE(dn, DMU_OT_PLAIN_FILE_CONTENTS); 917b1b8ab34Slling 918b1b8ab34Slling return (0); 919b1b8ab34Slling } 920b1b8ab34Slling 921b1b8ab34Slling /* 922b1b8ab34Slling * Get the default 'bootfs' property value from the rootpool. 923b1b8ab34Slling * 924b1b8ab34Slling * Return: 925b1b8ab34Slling * 0 - success 926b1b8ab34Slling * errnum -failure 927b1b8ab34Slling */ 928b1b8ab34Slling static int 929b1b8ab34Slling get_default_bootfsobj(dnode_phys_t *mosmdn, uint64_t *obj, char *stack) 930b1b8ab34Slling { 931b1b8ab34Slling uint64_t objnum = 0; 932b1b8ab34Slling dnode_phys_t *dn = (dnode_phys_t *)stack; 933b1b8ab34Slling stack += DNODE_SIZE; 934b1b8ab34Slling 935ae8180dbSlling if (errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, 936b1b8ab34Slling DMU_OT_OBJECT_DIRECTORY, dn, stack)) 937ae8180dbSlling return (errnum); 938b1b8ab34Slling 939b1b8ab34Slling /* 940b1b8ab34Slling * find the object number for 'pool_props', and get the dnode 941b1b8ab34Slling * of the 'pool_props'. 942b1b8ab34Slling */ 943b1b8ab34Slling if (zap_lookup(dn, DMU_POOL_PROPS, &objnum, stack)) 944b1b8ab34Slling return (ERR_FILESYSTEM_NOT_FOUND); 945b1b8ab34Slling 946ae8180dbSlling if (errnum = dnode_get(mosmdn, objnum, DMU_OT_POOL_PROPS, dn, stack)) 947ae8180dbSlling return (errnum); 948b1b8ab34Slling 949b1b8ab34Slling if (zap_lookup(dn, ZPOOL_PROP_BOOTFS, &objnum, stack)) 950b1b8ab34Slling return (ERR_FILESYSTEM_NOT_FOUND); 951b1b8ab34Slling 952b1b8ab34Slling if (!objnum) 953b1b8ab34Slling return (ERR_FILESYSTEM_NOT_FOUND); 954b1b8ab34Slling 955b1b8ab34Slling *obj = objnum; 956b1b8ab34Slling return (0); 957b1b8ab34Slling } 958b1b8ab34Slling 959ad135b5dSChristopher Siden /* 960ad135b5dSChristopher Siden * List of pool features that the grub implementation of ZFS supports for 961ad135b5dSChristopher Siden * read. Note that features that are only required for write do not need 962ad135b5dSChristopher Siden * to be listed here since grub opens pools in read-only mode. 96333915f34SRichard Lowe * 96433915f34SRichard Lowe * When this list is updated the version number in usr/src/grub/capability 96533915f34SRichard Lowe * must be incremented to ensure the new grub gets installed. 966ad135b5dSChristopher Siden */ 967ad135b5dSChristopher Siden static const char *spa_feature_names[] = { 968a6f561b4SSašo Kiselkov "org.illumos:lz4_compress", 969*43466aaeSMax Grossman "com.delphix:hole_birth", 9702acef22dSMatthew Ahrens "com.delphix:extensible_dataset", 971ad135b5dSChristopher Siden NULL 972ad135b5dSChristopher Siden }; 973ad135b5dSChristopher Siden 974ad135b5dSChristopher Siden /* 975ad135b5dSChristopher Siden * Checks whether the MOS features that are active are supported by this 976ad135b5dSChristopher Siden * (GRUB's) implementation of ZFS. 977ad135b5dSChristopher Siden * 978ad135b5dSChristopher Siden * Return: 979ad135b5dSChristopher Siden * 0: Success. 980ad135b5dSChristopher Siden * errnum: Failure. 981ad135b5dSChristopher Siden */ 982ad135b5dSChristopher Siden static int 983ad135b5dSChristopher Siden check_mos_features(dnode_phys_t *mosmdn, char *stack) 984ad135b5dSChristopher Siden { 985ad135b5dSChristopher Siden uint64_t objnum; 986ad135b5dSChristopher Siden dnode_phys_t *dn; 987ad135b5dSChristopher Siden uint8_t error = 0; 988ad135b5dSChristopher Siden 989ad135b5dSChristopher Siden dn = (dnode_phys_t *)stack; 990ad135b5dSChristopher Siden stack += DNODE_SIZE; 991ad135b5dSChristopher Siden 992ad135b5dSChristopher Siden if ((errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, 993ad135b5dSChristopher Siden DMU_OT_OBJECT_DIRECTORY, dn, stack)) != 0) 994ad135b5dSChristopher Siden return (errnum); 995ad135b5dSChristopher Siden 996ad135b5dSChristopher Siden /* 997ad135b5dSChristopher Siden * Find the object number for 'features_for_read' and retrieve its 998ad135b5dSChristopher Siden * corresponding dnode. Note that we don't check features_for_write 999ad135b5dSChristopher Siden * because GRUB is not opening the pool for write. 1000ad135b5dSChristopher Siden */ 1001ad135b5dSChristopher Siden if ((errnum = zap_lookup(dn, DMU_POOL_FEATURES_FOR_READ, &objnum, 1002ad135b5dSChristopher Siden stack)) != 0) 1003ad135b5dSChristopher Siden return (errnum); 1004ad135b5dSChristopher Siden 1005ad135b5dSChristopher Siden if ((errnum = dnode_get(mosmdn, objnum, DMU_OTN_ZAP_METADATA, 1006ad135b5dSChristopher Siden dn, stack)) != 0) 1007ad135b5dSChristopher Siden return (errnum); 1008ad135b5dSChristopher Siden 1009ad135b5dSChristopher Siden return (zap_iterate(dn, check_feature, spa_feature_names, stack)); 1010ad135b5dSChristopher Siden } 1011ad135b5dSChristopher Siden 1012b1b8ab34Slling /* 1013b1b8ab34Slling * Given a MOS metadnode, get the metadnode of a given filesystem name (fsname), 1014b1b8ab34Slling * e.g. pool/rootfs, or a given object number (obj), e.g. the object number 1015b1b8ab34Slling * of pool/rootfs. 1016b1b8ab34Slling * 1017b1b8ab34Slling * If no fsname and no obj are given, return the DSL_DIR metadnode. 1018b1b8ab34Slling * If fsname is given, return its metadnode and its matching object number. 1019b1b8ab34Slling * If only obj is given, return the metadnode for this object number. 1020b1b8ab34Slling * 1021b1b8ab34Slling * Return: 1022b1b8ab34Slling * 0 - success 1023b1b8ab34Slling * errnum - failure 1024b1b8ab34Slling */ 1025b1b8ab34Slling static int 1026b1b8ab34Slling get_objset_mdn(dnode_phys_t *mosmdn, char *fsname, uint64_t *obj, 1027b1b8ab34Slling dnode_phys_t *mdn, char *stack) 1028b1b8ab34Slling { 1029b1b8ab34Slling uint64_t objnum, headobj; 1030b1b8ab34Slling char *cname, ch; 1031b1b8ab34Slling blkptr_t *bp; 1032b1b8ab34Slling objset_phys_t *osp; 1033fe3e2633SEric Taylor int issnapshot = 0; 1034fe3e2633SEric Taylor char *snapname; 1035b1b8ab34Slling 1036b1b8ab34Slling if (fsname == NULL && obj) { 1037b1b8ab34Slling headobj = *obj; 1038b1b8ab34Slling goto skip; 1039b1b8ab34Slling } 1040b1b8ab34Slling 1041b1b8ab34Slling if (errnum = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT, 1042b1b8ab34Slling DMU_OT_OBJECT_DIRECTORY, mdn, stack)) 1043b1b8ab34Slling return (errnum); 1044b1b8ab34Slling 1045b1b8ab34Slling if (errnum = zap_lookup(mdn, DMU_POOL_ROOT_DATASET, &objnum, 1046b1b8ab34Slling stack)) 1047b1b8ab34Slling return (errnum); 1048b1b8ab34Slling 10492acef22dSMatthew Ahrens if (errnum = dnode_get(mosmdn, objnum, 0, mdn, stack)) 1050b1b8ab34Slling return (errnum); 1051b1b8ab34Slling 1052b1b8ab34Slling if (fsname == NULL) { 1053b1b8ab34Slling headobj = 1054b1b8ab34Slling ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_head_dataset_obj; 1055b1b8ab34Slling goto skip; 1056b1b8ab34Slling } 1057b1b8ab34Slling 1058b1b8ab34Slling /* take out the pool name */ 1059ad135b5dSChristopher Siden while (*fsname && !grub_isspace(*fsname) && *fsname != '/') 1060b1b8ab34Slling fsname++; 1061b1b8ab34Slling 1062ad135b5dSChristopher Siden while (*fsname && !grub_isspace(*fsname)) { 1063b1b8ab34Slling uint64_t childobj; 1064b1b8ab34Slling 1065b1b8ab34Slling while (*fsname == '/') 1066b1b8ab34Slling fsname++; 1067b1b8ab34Slling 1068b1b8ab34Slling cname = fsname; 1069ad135b5dSChristopher Siden while (*fsname && !grub_isspace(*fsname) && *fsname != '/') 1070b1b8ab34Slling fsname++; 1071b1b8ab34Slling ch = *fsname; 1072b1b8ab34Slling *fsname = 0; 1073b1b8ab34Slling 1074fe3e2633SEric Taylor snapname = cname; 1075ad135b5dSChristopher Siden while (*snapname && !grub_isspace(*snapname) && *snapname != 1076ad135b5dSChristopher Siden '@') 1077fe3e2633SEric Taylor snapname++; 1078fe3e2633SEric Taylor if (*snapname == '@') { 1079fe3e2633SEric Taylor issnapshot = 1; 1080fe3e2633SEric Taylor *snapname = 0; 1081fe3e2633SEric Taylor } 1082b1b8ab34Slling childobj = 1083b1b8ab34Slling ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_child_dir_zapobj; 1084b1b8ab34Slling if (errnum = dnode_get(mosmdn, childobj, 1085b1b8ab34Slling DMU_OT_DSL_DIR_CHILD_MAP, mdn, stack)) 1086b1b8ab34Slling return (errnum); 1087b1b8ab34Slling 1088ae8180dbSlling if (zap_lookup(mdn, cname, &objnum, stack)) 1089ae8180dbSlling return (ERR_FILESYSTEM_NOT_FOUND); 1090b1b8ab34Slling 10912acef22dSMatthew Ahrens if (errnum = dnode_get(mosmdn, objnum, 0, 1092b1b8ab34Slling mdn, stack)) 1093b1b8ab34Slling return (errnum); 1094b1b8ab34Slling 1095b1b8ab34Slling *fsname = ch; 1096fe3e2633SEric Taylor if (issnapshot) 1097fe3e2633SEric Taylor *snapname = '@'; 1098b1b8ab34Slling } 1099b1b8ab34Slling headobj = ((dsl_dir_phys_t *)DN_BONUS(mdn))->dd_head_dataset_obj; 1100b1b8ab34Slling if (obj) 1101b1b8ab34Slling *obj = headobj; 1102b1b8ab34Slling 1103b1b8ab34Slling skip: 11042acef22dSMatthew Ahrens if (errnum = dnode_get(mosmdn, headobj, 0, mdn, stack)) 1105b1b8ab34Slling return (errnum); 1106fe3e2633SEric Taylor if (issnapshot) { 1107fe3e2633SEric Taylor uint64_t snapobj; 1108fe3e2633SEric Taylor 1109fe3e2633SEric Taylor snapobj = ((dsl_dataset_phys_t *)DN_BONUS(mdn))-> 1110fe3e2633SEric Taylor ds_snapnames_zapobj; 1111b1b8ab34Slling 1112fe3e2633SEric Taylor if (errnum = dnode_get(mosmdn, snapobj, 1113fe3e2633SEric Taylor DMU_OT_DSL_DS_SNAP_MAP, mdn, stack)) 1114fe3e2633SEric Taylor return (errnum); 1115fe3e2633SEric Taylor if (zap_lookup(mdn, snapname + 1, &headobj, stack)) 1116fe3e2633SEric Taylor return (ERR_FILESYSTEM_NOT_FOUND); 11172acef22dSMatthew Ahrens if (errnum = dnode_get(mosmdn, headobj, 0, mdn, stack)) 1118fe3e2633SEric Taylor return (errnum); 1119fe3e2633SEric Taylor if (obj) 1120fe3e2633SEric Taylor *obj = headobj; 1121fe3e2633SEric Taylor } 1122b1b8ab34Slling 1123b1b8ab34Slling bp = &((dsl_dataset_phys_t *)DN_BONUS(mdn))->ds_bp; 1124b1b8ab34Slling osp = (objset_phys_t *)stack; 1125b1b8ab34Slling stack += sizeof (objset_phys_t); 1126b1b8ab34Slling if (errnum = zio_read(bp, osp, stack)) 1127b1b8ab34Slling return (errnum); 1128b1b8ab34Slling 1129b1b8ab34Slling grub_memmove((char *)mdn, (char *)&osp->os_meta_dnode, DNODE_SIZE); 1130b1b8ab34Slling 1131b1b8ab34Slling return (0); 1132b1b8ab34Slling } 1133b1b8ab34Slling 1134b1b8ab34Slling /* 1135e7cbe64fSgw * For a given XDR packed nvlist, verify the first 4 bytes and move on. 1136b1b8ab34Slling * 1137e7cbe64fSgw * An XDR packed nvlist is encoded as (comments from nvs_xdr_create) : 1138b1b8ab34Slling * 1139b1b8ab34Slling * encoding method/host endian (4 bytes) 1140b1b8ab34Slling * nvl_version (4 bytes) 1141b1b8ab34Slling * nvl_nvflag (4 bytes) 1142b1b8ab34Slling * encoded nvpairs: 1143b1b8ab34Slling * encoded size of the nvpair (4 bytes) 1144b1b8ab34Slling * decoded size of the nvpair (4 bytes) 1145b1b8ab34Slling * name string size (4 bytes) 1146b1b8ab34Slling * name string data (sizeof(NV_ALIGN4(string)) 1147b1b8ab34Slling * data type (4 bytes) 1148b1b8ab34Slling * # of elements in the nvpair (4 bytes) 1149b1b8ab34Slling * data 1150b1b8ab34Slling * 2 zero's for the last nvpair 1151b1b8ab34Slling * (end of the entire list) (8 bytes) 1152b1b8ab34Slling * 1153b1b8ab34Slling * Return: 1154b1b8ab34Slling * 0 - success 1155b1b8ab34Slling * 1 - failure 1156b1b8ab34Slling */ 1157e7cbe64fSgw static int 1158e7cbe64fSgw nvlist_unpack(char *nvlist, char **out) 1159b1b8ab34Slling { 1160b1b8ab34Slling /* Verify if the 1st and 2nd byte in the nvlist are valid. */ 1161b1b8ab34Slling if (nvlist[0] != NV_ENCODE_XDR || nvlist[1] != HOST_ENDIAN) 1162b1b8ab34Slling return (1); 1163b1b8ab34Slling 1164ad135b5dSChristopher Siden *out = nvlist + 4; 1165e7cbe64fSgw return (0); 1166e7cbe64fSgw } 1167e7cbe64fSgw 1168e7cbe64fSgw static char * 1169e7cbe64fSgw nvlist_array(char *nvlist, int index) 1170e7cbe64fSgw { 1171e7cbe64fSgw int i, encode_size; 1172e7cbe64fSgw 1173e7cbe64fSgw for (i = 0; i < index; i++) { 1174e7cbe64fSgw /* skip the header, nvl_version, and nvl_nvflag */ 1175e7cbe64fSgw nvlist = nvlist + 4 * 2; 1176e7cbe64fSgw 1177e7cbe64fSgw while (encode_size = BSWAP_32(*(uint32_t *)nvlist)) 1178e7cbe64fSgw nvlist += encode_size; /* goto the next nvpair */ 1179e7cbe64fSgw 1180e7cbe64fSgw nvlist = nvlist + 4 * 2; /* skip the ending 2 zeros - 8 bytes */ 1181e7cbe64fSgw } 1182e7cbe64fSgw 1183e7cbe64fSgw return (nvlist); 1184e7cbe64fSgw } 1185e7cbe64fSgw 1186ad135b5dSChristopher Siden /* 1187ad135b5dSChristopher Siden * The nvlist_next_nvpair() function returns a handle to the next nvpair in the 1188ad135b5dSChristopher Siden * list following nvpair. If nvpair is NULL, the first pair is returned. If 1189ad135b5dSChristopher Siden * nvpair is the last pair in the nvlist, NULL is returned. 1190ad135b5dSChristopher Siden */ 1191ad135b5dSChristopher Siden static char * 1192ad135b5dSChristopher Siden nvlist_next_nvpair(char *nvl, char *nvpair) 1193ad135b5dSChristopher Siden { 1194ad135b5dSChristopher Siden char *cur, *prev; 1195ad135b5dSChristopher Siden int encode_size; 1196ad135b5dSChristopher Siden 1197ad135b5dSChristopher Siden if (nvl == NULL) 1198ad135b5dSChristopher Siden return (NULL); 1199ad135b5dSChristopher Siden 1200ad135b5dSChristopher Siden if (nvpair == NULL) { 1201ad135b5dSChristopher Siden /* skip over nvl_version and nvl_nvflag */ 1202ad135b5dSChristopher Siden nvpair = nvl + 4 * 2; 1203ad135b5dSChristopher Siden } else { 1204ad135b5dSChristopher Siden /* skip to the next nvpair */ 1205ad135b5dSChristopher Siden encode_size = BSWAP_32(*(uint32_t *)nvpair); 1206ad135b5dSChristopher Siden nvpair += encode_size; 1207ad135b5dSChristopher Siden } 1208ad135b5dSChristopher Siden 1209ad135b5dSChristopher Siden /* 8 bytes of 0 marks the end of the list */ 1210ad135b5dSChristopher Siden if (*(uint64_t *)nvpair == 0) 1211ad135b5dSChristopher Siden return (NULL); 1212ad135b5dSChristopher Siden 1213ad135b5dSChristopher Siden return (nvpair); 1214ad135b5dSChristopher Siden } 1215ad135b5dSChristopher Siden 1216ad135b5dSChristopher Siden /* 1217ad135b5dSChristopher Siden * This function returns 0 on success and 1 on failure. On success, a string 1218ad135b5dSChristopher Siden * containing the name of nvpair is saved in buf. 1219ad135b5dSChristopher Siden */ 1220e7cbe64fSgw static int 1221ad135b5dSChristopher Siden nvpair_name(char *nvp, char *buf, int buflen) 1222ad135b5dSChristopher Siden { 1223ad135b5dSChristopher Siden int len; 1224ad135b5dSChristopher Siden 1225ad135b5dSChristopher Siden /* skip over encode/decode size */ 1226ad135b5dSChristopher Siden nvp += 4 * 2; 1227ad135b5dSChristopher Siden 1228ad135b5dSChristopher Siden len = BSWAP_32(*(uint32_t *)nvp); 1229ad135b5dSChristopher Siden if (buflen < len + 1) 1230ad135b5dSChristopher Siden return (1); 1231ad135b5dSChristopher Siden 1232ad135b5dSChristopher Siden grub_memmove(buf, nvp + 4, len); 1233ad135b5dSChristopher Siden buf[len] = '\0'; 1234ad135b5dSChristopher Siden 1235ad135b5dSChristopher Siden return (0); 1236ad135b5dSChristopher Siden } 1237ad135b5dSChristopher Siden 1238ad135b5dSChristopher Siden /* 1239ad135b5dSChristopher Siden * This function retrieves the value of the nvpair in the form of enumerated 1240ad135b5dSChristopher Siden * type data_type_t. This is used to determine the appropriate type to pass to 1241ad135b5dSChristopher Siden * nvpair_value(). 1242ad135b5dSChristopher Siden */ 1243ad135b5dSChristopher Siden static int 1244ad135b5dSChristopher Siden nvpair_type(char *nvp) 1245e7cbe64fSgw { 1246ad135b5dSChristopher Siden int name_len, type; 1247ad135b5dSChristopher Siden 1248ad135b5dSChristopher Siden /* skip over encode/decode size */ 1249ad135b5dSChristopher Siden nvp += 4 * 2; 1250ad135b5dSChristopher Siden 1251ad135b5dSChristopher Siden /* skip over name_len */ 1252ad135b5dSChristopher Siden name_len = BSWAP_32(*(uint32_t *)nvp); 1253ad135b5dSChristopher Siden nvp += 4; 1254ad135b5dSChristopher Siden 1255ad135b5dSChristopher Siden /* skip over name */ 1256ad135b5dSChristopher Siden nvp = nvp + ((name_len + 3) & ~3); /* align */ 1257ad135b5dSChristopher Siden 1258ad135b5dSChristopher Siden type = BSWAP_32(*(uint32_t *)nvp); 1259ad135b5dSChristopher Siden 1260ad135b5dSChristopher Siden return (type); 1261ad135b5dSChristopher Siden } 1262ad135b5dSChristopher Siden 1263ad135b5dSChristopher Siden static int 1264ad135b5dSChristopher Siden nvpair_value(char *nvp, void *val, int valtype, int *nelmp) 1265ad135b5dSChristopher Siden { 1266ad135b5dSChristopher Siden int name_len, type, slen; 1267ad135b5dSChristopher Siden char *strval = val; 1268e7cbe64fSgw uint64_t *intval = val; 1269e7cbe64fSgw 1270ad135b5dSChristopher Siden /* skip over encode/decode size */ 1271ad135b5dSChristopher Siden nvp += 4 * 2; 1272b1b8ab34Slling 1273ad135b5dSChristopher Siden /* skip over name_len */ 1274ad135b5dSChristopher Siden name_len = BSWAP_32(*(uint32_t *)nvp); 1275ad135b5dSChristopher Siden nvp += 4; 1276b1b8ab34Slling 1277ad135b5dSChristopher Siden /* skip over name */ 1278ad135b5dSChristopher Siden nvp = nvp + ((name_len + 3) & ~3); /* align */ 1279b1b8ab34Slling 1280ad135b5dSChristopher Siden /* skip over type */ 1281ad135b5dSChristopher Siden type = BSWAP_32(*(uint32_t *)nvp); 1282ad135b5dSChristopher Siden nvp += 4; 1283b1b8ab34Slling 1284ad135b5dSChristopher Siden if (type == valtype) { 1285ad135b5dSChristopher Siden int nelm; 1286b1b8ab34Slling 1287ad135b5dSChristopher Siden nelm = BSWAP_32(*(uint32_t *)nvp); 1288ad135b5dSChristopher Siden if (valtype != DATA_TYPE_BOOLEAN && nelm < 1) 1289ad135b5dSChristopher Siden return (1); 1290ad135b5dSChristopher Siden nvp += 4; 1291b1b8ab34Slling 1292ad135b5dSChristopher Siden switch (valtype) { 1293ad135b5dSChristopher Siden case DATA_TYPE_BOOLEAN: 1294ad135b5dSChristopher Siden return (0); 1295b1b8ab34Slling 1296ad135b5dSChristopher Siden case DATA_TYPE_STRING: 1297ad135b5dSChristopher Siden slen = BSWAP_32(*(uint32_t *)nvp); 1298ad135b5dSChristopher Siden nvp += 4; 1299ad135b5dSChristopher Siden grub_memmove(strval, nvp, slen); 1300ad135b5dSChristopher Siden strval[slen] = '\0'; 1301ad135b5dSChristopher Siden return (0); 1302b1b8ab34Slling 1303ad135b5dSChristopher Siden case DATA_TYPE_UINT64: 1304ad135b5dSChristopher Siden *intval = BSWAP_64(*(uint64_t *)nvp); 1305ad135b5dSChristopher Siden return (0); 1306e7cbe64fSgw 1307ad135b5dSChristopher Siden case DATA_TYPE_NVLIST: 1308ad135b5dSChristopher Siden *(void **)val = (void *)nvp; 1309ad135b5dSChristopher Siden return (0); 1310e7cbe64fSgw 1311ad135b5dSChristopher Siden case DATA_TYPE_NVLIST_ARRAY: 1312ad135b5dSChristopher Siden *(void **)val = (void *)nvp; 1313ad135b5dSChristopher Siden if (nelmp) 1314ad135b5dSChristopher Siden *nelmp = nelm; 1315ad135b5dSChristopher Siden return (0); 1316b1b8ab34Slling } 1317b1b8ab34Slling } 1318b1b8ab34Slling 1319b1b8ab34Slling return (1); 1320b1b8ab34Slling } 1321b1b8ab34Slling 1322ad135b5dSChristopher Siden static int 1323ad135b5dSChristopher Siden nvlist_lookup_value(char *nvlist, char *name, void *val, int valtype, 1324ad135b5dSChristopher Siden int *nelmp) 1325ad135b5dSChristopher Siden { 1326ad135b5dSChristopher Siden char *nvpair; 1327ad135b5dSChristopher Siden 1328ad135b5dSChristopher Siden for (nvpair = nvlist_next_nvpair(nvlist, NULL); 1329ad135b5dSChristopher Siden nvpair != NULL; 1330ad135b5dSChristopher Siden nvpair = nvlist_next_nvpair(nvlist, nvpair)) { 1331ad135b5dSChristopher Siden int name_len = BSWAP_32(*(uint32_t *)(nvpair + 4 * 2)); 1332ad135b5dSChristopher Siden char *nvp_name = nvpair + 4 * 3; 1333ad135b5dSChristopher Siden 1334ad135b5dSChristopher Siden if ((grub_strncmp(nvp_name, name, name_len) == 0) && 1335ad135b5dSChristopher Siden nvpair_type(nvpair) == valtype) { 1336ad135b5dSChristopher Siden return (nvpair_value(nvpair, val, valtype, nelmp)); 1337ad135b5dSChristopher Siden } 1338ad135b5dSChristopher Siden } 1339ad135b5dSChristopher Siden return (1); 1340ad135b5dSChristopher Siden } 1341ad135b5dSChristopher Siden 1342b1b8ab34Slling /* 1343e7cbe64fSgw * Check if this vdev is online and is in a good state. 1344e7cbe64fSgw */ 1345e7cbe64fSgw static int 1346e7cbe64fSgw vdev_validate(char *nv) 1347e7cbe64fSgw { 1348e7cbe64fSgw uint64_t ival; 1349e7cbe64fSgw 1350e7cbe64fSgw if (nvlist_lookup_value(nv, ZPOOL_CONFIG_OFFLINE, &ival, 1351e7cbe64fSgw DATA_TYPE_UINT64, NULL) == 0 || 1352e7cbe64fSgw nvlist_lookup_value(nv, ZPOOL_CONFIG_FAULTED, &ival, 1353e7cbe64fSgw DATA_TYPE_UINT64, NULL) == 0 || 1354e7cbe64fSgw nvlist_lookup_value(nv, ZPOOL_CONFIG_REMOVED, &ival, 1355e7cbe64fSgw DATA_TYPE_UINT64, NULL) == 0) 1356e7cbe64fSgw return (ERR_DEV_VALUES); 1357e7cbe64fSgw 1358e7cbe64fSgw return (0); 1359e7cbe64fSgw } 1360e7cbe64fSgw 1361e7cbe64fSgw /* 136221ecdf64SLin Ling * Get a valid vdev pathname/devid from the boot device. 1363ffb5616eSLin Ling * The caller should already allocate MAXPATHLEN memory for bootpath and devid. 1364e7cbe64fSgw */ 136521ecdf64SLin Ling static int 136621ecdf64SLin Ling vdev_get_bootpath(char *nv, uint64_t inguid, char *devid, char *bootpath, 136721ecdf64SLin Ling int is_spare) 1368e7cbe64fSgw { 1369e7cbe64fSgw char type[16]; 1370e7cbe64fSgw 1371e7cbe64fSgw if (nvlist_lookup_value(nv, ZPOOL_CONFIG_TYPE, &type, DATA_TYPE_STRING, 1372e7cbe64fSgw NULL)) 1373e7cbe64fSgw return (ERR_FSYS_CORRUPT); 1374e7cbe64fSgw 1375ad135b5dSChristopher Siden if (grub_strcmp(type, VDEV_TYPE_DISK) == 0) { 1376ffb5616eSLin Ling uint64_t guid; 1377ffb5616eSLin Ling 1378ffb5616eSLin Ling if (vdev_validate(nv) != 0) 1379ffb5616eSLin Ling return (ERR_NO_BOOTPATH); 1380ffb5616eSLin Ling 1381ffb5616eSLin Ling if (nvlist_lookup_value(nv, ZPOOL_CONFIG_GUID, 1382ffb5616eSLin Ling &guid, DATA_TYPE_UINT64, NULL) != 0) 1383ffb5616eSLin Ling return (ERR_NO_BOOTPATH); 1384ffb5616eSLin Ling 1385ffb5616eSLin Ling if (guid != inguid) 1386e7cbe64fSgw return (ERR_NO_BOOTPATH); 1387e7cbe64fSgw 138821ecdf64SLin Ling /* for a spare vdev, pick the disk labeled with "is_spare" */ 138921ecdf64SLin Ling if (is_spare) { 139021ecdf64SLin Ling uint64_t spare = 0; 139121ecdf64SLin Ling (void) nvlist_lookup_value(nv, ZPOOL_CONFIG_IS_SPARE, 139221ecdf64SLin Ling &spare, DATA_TYPE_UINT64, NULL); 139321ecdf64SLin Ling if (!spare) 139421ecdf64SLin Ling return (ERR_NO_BOOTPATH); 139521ecdf64SLin Ling } 139621ecdf64SLin Ling 1397ffb5616eSLin Ling if (nvlist_lookup_value(nv, ZPOOL_CONFIG_PHYS_PATH, 1398ffb5616eSLin Ling bootpath, DATA_TYPE_STRING, NULL) != 0) 1399ffb5616eSLin Ling bootpath[0] = '\0'; 1400ffb5616eSLin Ling 1401ffb5616eSLin Ling if (nvlist_lookup_value(nv, ZPOOL_CONFIG_DEVID, 1402ffb5616eSLin Ling devid, DATA_TYPE_STRING, NULL) != 0) 1403ffb5616eSLin Ling devid[0] = '\0'; 1404ffb5616eSLin Ling 1405ad135b5dSChristopher Siden if (grub_strlen(bootpath) >= MAXPATHLEN || 1406ad135b5dSChristopher Siden grub_strlen(devid) >= MAXPATHLEN) 1407ffb5616eSLin Ling return (ERR_WONT_FIT); 1408ffb5616eSLin Ling 1409ffb5616eSLin Ling return (0); 1410ffb5616eSLin Ling 1411ad135b5dSChristopher Siden } else if (grub_strcmp(type, VDEV_TYPE_MIRROR) == 0 || 1412ad135b5dSChristopher Siden grub_strcmp(type, VDEV_TYPE_REPLACING) == 0 || 1413ad135b5dSChristopher Siden (is_spare = (grub_strcmp(type, VDEV_TYPE_SPARE) == 0))) { 1414e7cbe64fSgw int nelm, i; 1415e7cbe64fSgw char *child; 1416e7cbe64fSgw 1417e7cbe64fSgw if (nvlist_lookup_value(nv, ZPOOL_CONFIG_CHILDREN, &child, 1418e7cbe64fSgw DATA_TYPE_NVLIST_ARRAY, &nelm)) 1419e7cbe64fSgw return (ERR_FSYS_CORRUPT); 1420e7cbe64fSgw 1421e7cbe64fSgw for (i = 0; i < nelm; i++) { 1422e7cbe64fSgw char *child_i; 1423e7cbe64fSgw 1424e7cbe64fSgw child_i = nvlist_array(child, i); 1425ffb5616eSLin Ling if (vdev_get_bootpath(child_i, inguid, devid, 142621ecdf64SLin Ling bootpath, is_spare) == 0) 1427ffb5616eSLin Ling return (0); 1428e7cbe64fSgw } 1429e7cbe64fSgw } 1430e7cbe64fSgw 1431ffb5616eSLin Ling return (ERR_NO_BOOTPATH); 1432e7cbe64fSgw } 1433e7cbe64fSgw 1434e7cbe64fSgw /* 1435e7cbe64fSgw * Check the disk label information and retrieve needed vdev name-value pairs. 1436b1b8ab34Slling * 1437b1b8ab34Slling * Return: 1438b1b8ab34Slling * 0 - success 1439e7cbe64fSgw * ERR_* - failure 1440b1b8ab34Slling */ 1441ad135b5dSChristopher Siden static int 1442e23347b1SEric Taylor check_pool_label(uint64_t sector, char *stack, char *outdevid, 1443ad135b5dSChristopher Siden char *outpath, uint64_t *outguid, uint64_t *outashift, uint64_t *outversion) 1444b1b8ab34Slling { 1445b1b8ab34Slling vdev_phys_t *vdev; 1446e23347b1SEric Taylor uint64_t pool_state, txg = 0; 1447ad135b5dSChristopher Siden char *nvlist, *nv, *features; 1448051aabe6Staylor uint64_t diskguid; 1449b1b8ab34Slling 1450e23347b1SEric Taylor sector += (VDEV_SKIP_SIZE >> SPA_MINBLOCKSHIFT); 1451b1b8ab34Slling 1452b1b8ab34Slling /* Read in the vdev name-value pair list (112K). */ 1453b1b8ab34Slling if (devread(sector, 0, VDEV_PHYS_SIZE, stack) == 0) 1454b1b8ab34Slling return (ERR_READ); 1455b1b8ab34Slling 1456b1b8ab34Slling vdev = (vdev_phys_t *)stack; 1457e4c3b53dStaylor stack += sizeof (vdev_phys_t); 1458b1b8ab34Slling 1459e7cbe64fSgw if (nvlist_unpack(vdev->vp_nvlist, &nvlist)) 1460b1b8ab34Slling return (ERR_FSYS_CORRUPT); 1461e7cbe64fSgw 1462e7cbe64fSgw if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_STATE, &pool_state, 1463e7cbe64fSgw DATA_TYPE_UINT64, NULL)) 1464e7cbe64fSgw return (ERR_FSYS_CORRUPT); 1465e7cbe64fSgw 1466e7cbe64fSgw if (pool_state == POOL_STATE_DESTROYED) 1467e7cbe64fSgw return (ERR_FILESYSTEM_NOT_FOUND); 1468e7cbe64fSgw 1469e7cbe64fSgw if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_NAME, 1470e7cbe64fSgw current_rootpool, DATA_TYPE_STRING, NULL)) 1471e7cbe64fSgw return (ERR_FSYS_CORRUPT); 1472e7cbe64fSgw 1473e7cbe64fSgw if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_TXG, &txg, 1474e7cbe64fSgw DATA_TYPE_UINT64, NULL)) 1475e7cbe64fSgw return (ERR_FSYS_CORRUPT); 1476e7cbe64fSgw 1477e7cbe64fSgw /* not an active device */ 1478e7cbe64fSgw if (txg == 0) 1479e7cbe64fSgw return (ERR_NO_BOOTPATH); 1480e7cbe64fSgw 1481ad135b5dSChristopher Siden if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_VERSION, outversion, 1482fe3e2633SEric Taylor DATA_TYPE_UINT64, NULL)) 1483fe3e2633SEric Taylor return (ERR_FSYS_CORRUPT); 1484ad135b5dSChristopher Siden if (!SPA_VERSION_IS_SUPPORTED(*outversion)) 1485fe3e2633SEric Taylor return (ERR_NEWER_VERSION); 1486e7cbe64fSgw if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_VDEV_TREE, &nv, 1487e7cbe64fSgw DATA_TYPE_NVLIST, NULL)) 1488e7cbe64fSgw return (ERR_FSYS_CORRUPT); 1489051aabe6Staylor if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_GUID, &diskguid, 1490051aabe6Staylor DATA_TYPE_UINT64, NULL)) 1491051aabe6Staylor return (ERR_FSYS_CORRUPT); 149281b2d573SHans Rosenfeld if (nvlist_lookup_value(nv, ZPOOL_CONFIG_ASHIFT, outashift, 149381b2d573SHans Rosenfeld DATA_TYPE_UINT64, NULL) != 0) 149481b2d573SHans Rosenfeld return (ERR_FSYS_CORRUPT); 149521ecdf64SLin Ling if (vdev_get_bootpath(nv, diskguid, outdevid, outpath, 0)) 1496e7cbe64fSgw return (ERR_NO_BOOTPATH); 1497e23347b1SEric Taylor if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_POOL_GUID, outguid, 1498e23347b1SEric Taylor DATA_TYPE_UINT64, NULL)) 1499e23347b1SEric Taylor return (ERR_FSYS_CORRUPT); 1500ad135b5dSChristopher Siden 1501ad135b5dSChristopher Siden if (nvlist_lookup_value(nvlist, ZPOOL_CONFIG_FEATURES_FOR_READ, 1502ad135b5dSChristopher Siden &features, DATA_TYPE_NVLIST, NULL) == 0) { 1503ad135b5dSChristopher Siden char *nvp; 1504ad135b5dSChristopher Siden char *name = stack; 1505ad135b5dSChristopher Siden stack += MAXNAMELEN; 1506ad135b5dSChristopher Siden 1507ad135b5dSChristopher Siden for (nvp = nvlist_next_nvpair(features, NULL); 1508ad135b5dSChristopher Siden nvp != NULL; 1509ad135b5dSChristopher Siden nvp = nvlist_next_nvpair(features, nvp)) { 1510ad135b5dSChristopher Siden zap_attribute_t za; 1511ad135b5dSChristopher Siden 1512ad135b5dSChristopher Siden if (nvpair_name(nvp, name, MAXNAMELEN) != 0) 1513ad135b5dSChristopher Siden return (ERR_FSYS_CORRUPT); 1514ad135b5dSChristopher Siden 1515ad135b5dSChristopher Siden za.za_integer_length = 8; 1516ad135b5dSChristopher Siden za.za_num_integers = 1; 1517ad135b5dSChristopher Siden za.za_first_integer = 1; 1518ad135b5dSChristopher Siden za.za_name = name; 1519ad135b5dSChristopher Siden if (check_feature(&za, spa_feature_names, stack) != 0) 1520ad135b5dSChristopher Siden return (ERR_NEWER_VERSION); 1521ad135b5dSChristopher Siden } 1522ad135b5dSChristopher Siden } 1523ad135b5dSChristopher Siden 1524e7cbe64fSgw return (0); 1525b1b8ab34Slling } 1526b1b8ab34Slling 1527b1b8ab34Slling /* 1528b1b8ab34Slling * zfs_mount() locates a valid uberblock of the root pool and read in its MOS 1529b1b8ab34Slling * to the memory address MOS. 1530b1b8ab34Slling * 1531b1b8ab34Slling * Return: 1532b1b8ab34Slling * 1 - success 1533b1b8ab34Slling * 0 - failure 1534b1b8ab34Slling */ 1535b1b8ab34Slling int 1536b1b8ab34Slling zfs_mount(void) 1537b1b8ab34Slling { 153881b2d573SHans Rosenfeld char *stack, *ub_array; 1539b1b8ab34Slling int label = 0; 154081b2d573SHans Rosenfeld uberblock_t *ubbest; 1541b1b8ab34Slling objset_phys_t *osp; 1542051aabe6Staylor char tmp_bootpath[MAXNAMELEN]; 1543051aabe6Staylor char tmp_devid[MAXNAMELEN]; 1544ad135b5dSChristopher Siden uint64_t tmp_guid, ashift, version; 1545e23347b1SEric Taylor uint64_t adjpl = (uint64_t)part_length << SPA_MINBLOCKSHIFT; 1546bbe6aa77SJan Setje-Eilers int err = errnum; /* preserve previous errnum state */ 1547051aabe6Staylor 1548051aabe6Staylor /* if it's our first time here, zero the best uberblock out */ 1549e23347b1SEric Taylor if (best_drive == 0 && best_part == 0 && find_best_root) { 1550e37b211cStaylor grub_memset(¤t_uberblock, 0, sizeof (uberblock_t)); 1551e23347b1SEric Taylor pool_guid = 0; 1552e23347b1SEric Taylor } 1553b1b8ab34Slling 1554b1b8ab34Slling stackbase = ZFS_SCRATCH; 1555b1b8ab34Slling stack = stackbase; 155681b2d573SHans Rosenfeld ub_array = stack; 1557b1b8ab34Slling stack += VDEV_UBERBLOCK_RING; 1558b1b8ab34Slling 1559b1b8ab34Slling osp = (objset_phys_t *)stack; 1560b1b8ab34Slling stack += sizeof (objset_phys_t); 1561e23347b1SEric Taylor adjpl = P2ALIGN(adjpl, (uint64_t)sizeof (vdev_label_t)); 1562b1b8ab34Slling 1563e23347b1SEric Taylor for (label = 0; label < VDEV_LABELS; label++) { 156498c507c4SJan Setje-Eilers 156598c507c4SJan Setje-Eilers /* 156698c507c4SJan Setje-Eilers * some eltorito stacks don't give us a size and 156798c507c4SJan Setje-Eilers * we end up setting the size to MAXUINT, further 156898c507c4SJan Setje-Eilers * some of these devices stop working once a single 156998c507c4SJan Setje-Eilers * read past the end has been issued. Checking 157098c507c4SJan Setje-Eilers * for a maximum part_length and skipping the backup 157198c507c4SJan Setje-Eilers * labels at the end of the slice/partition/device 157298c507c4SJan Setje-Eilers * avoids breaking down on such devices. 157398c507c4SJan Setje-Eilers */ 157498c507c4SJan Setje-Eilers if (part_length == MAXUINT && label == 2) 157598c507c4SJan Setje-Eilers break; 157698c507c4SJan Setje-Eilers 1577e23347b1SEric Taylor uint64_t sector = vdev_label_start(adjpl, 1578e23347b1SEric Taylor label) >> SPA_MINBLOCKSHIFT; 1579b1b8ab34Slling 1580b1b8ab34Slling /* Read in the uberblock ring (128K). */ 1581e23347b1SEric Taylor if (devread(sector + 158281b2d573SHans Rosenfeld ((VDEV_SKIP_SIZE + VDEV_PHYS_SIZE) >> SPA_MINBLOCKSHIFT), 158381b2d573SHans Rosenfeld 0, VDEV_UBERBLOCK_RING, ub_array) == 0) 1584b1b8ab34Slling continue; 1585b1b8ab34Slling 158681b2d573SHans Rosenfeld if (check_pool_label(sector, stack, tmp_devid, 1587ad135b5dSChristopher Siden tmp_bootpath, &tmp_guid, &ashift, &version)) 158881b2d573SHans Rosenfeld continue; 158981b2d573SHans Rosenfeld 159081b2d573SHans Rosenfeld if (pool_guid == 0) 159181b2d573SHans Rosenfeld pool_guid = tmp_guid; 159281b2d573SHans Rosenfeld 159381b2d573SHans Rosenfeld if ((ubbest = find_bestub(ub_array, ashift, sector)) == NULL || 159481b2d573SHans Rosenfeld zio_read(&ubbest->ub_rootbp, osp, stack) != 0) 159581b2d573SHans Rosenfeld continue; 159681b2d573SHans Rosenfeld 159781b2d573SHans Rosenfeld VERIFY_OS_TYPE(osp, DMU_OST_META); 159881b2d573SHans Rosenfeld 1599ad135b5dSChristopher Siden if (version >= SPA_VERSION_FEATURES && 1600ad135b5dSChristopher Siden check_mos_features(&osp->os_meta_dnode, stack) != 0) 1601ad135b5dSChristopher Siden continue; 1602ad135b5dSChristopher Siden 160381b2d573SHans Rosenfeld if (find_best_root && ((pool_guid != tmp_guid) || 160481b2d573SHans Rosenfeld vdev_uberblock_compare(ubbest, &(current_uberblock)) <= 0)) 160581b2d573SHans Rosenfeld continue; 160681b2d573SHans Rosenfeld 160781b2d573SHans Rosenfeld /* Got the MOS. Save it at the memory addr MOS. */ 160881b2d573SHans Rosenfeld grub_memmove(MOS, &osp->os_meta_dnode, DNODE_SIZE); 160981b2d573SHans Rosenfeld grub_memmove(¤t_uberblock, ubbest, sizeof (uberblock_t)); 161081b2d573SHans Rosenfeld grub_memmove(current_bootpath, tmp_bootpath, MAXNAMELEN); 161181b2d573SHans Rosenfeld grub_memmove(current_devid, tmp_devid, grub_strlen(tmp_devid)); 161281b2d573SHans Rosenfeld is_zfs_mount = 1; 161381b2d573SHans Rosenfeld return (1); 1614b1b8ab34Slling } 1615b1b8ab34Slling 1616bbe6aa77SJan Setje-Eilers /* 1617bbe6aa77SJan Setje-Eilers * While some fs impls. (tftp) rely on setting and keeping 1618bbe6aa77SJan Setje-Eilers * global errnums set, others won't reset it and will break 1619bbe6aa77SJan Setje-Eilers * when issuing rawreads. The goal here is to simply not 1620bbe6aa77SJan Setje-Eilers * have zfs mount attempts impact the previous state. 1621bbe6aa77SJan Setje-Eilers */ 1622bbe6aa77SJan Setje-Eilers errnum = err; 1623b1b8ab34Slling return (0); 1624b1b8ab34Slling } 1625b1b8ab34Slling 1626b1b8ab34Slling /* 1627b1b8ab34Slling * zfs_open() locates a file in the rootpool by following the 1628b1b8ab34Slling * MOS and places the dnode of the file in the memory address DNODE. 1629b1b8ab34Slling * 1630b1b8ab34Slling * Return: 1631b1b8ab34Slling * 1 - success 1632b1b8ab34Slling * 0 - failure 1633b1b8ab34Slling */ 1634b1b8ab34Slling int 1635b1b8ab34Slling zfs_open(char *filename) 1636b1b8ab34Slling { 1637b1b8ab34Slling char *stack; 1638b1b8ab34Slling dnode_phys_t *mdn; 1639b1b8ab34Slling 1640b1b8ab34Slling file_buf = NULL; 1641b1b8ab34Slling stackbase = ZFS_SCRATCH; 1642b1b8ab34Slling stack = stackbase; 1643b1b8ab34Slling 1644b1b8ab34Slling mdn = (dnode_phys_t *)stack; 1645b1b8ab34Slling stack += sizeof (dnode_phys_t); 1646b1b8ab34Slling 1647b1b8ab34Slling dnode_mdn = NULL; 1648b1b8ab34Slling dnode_buf = (dnode_phys_t *)stack; 1649b1b8ab34Slling stack += 1<<DNODE_BLOCK_SHIFT; 1650b1b8ab34Slling 1651b1b8ab34Slling /* 1652b1b8ab34Slling * menu.lst is placed at the root pool filesystem level, 1653b1b8ab34Slling * do not goto 'current_bootfs'. 1654b1b8ab34Slling */ 1655eb2bd662Svikram if (is_top_dataset_file(filename)) { 1656b1b8ab34Slling if (errnum = get_objset_mdn(MOS, NULL, NULL, mdn, stack)) 1657b1b8ab34Slling return (0); 1658b1b8ab34Slling 1659b1b8ab34Slling current_bootfs_obj = 0; 1660b1b8ab34Slling } else { 1661b1b8ab34Slling if (current_bootfs[0] == '\0') { 1662b1b8ab34Slling /* Get the default root filesystem object number */ 1663ae8180dbSlling if (errnum = get_default_bootfsobj(MOS, 1664ae8180dbSlling ¤t_bootfs_obj, stack)) 1665b1b8ab34Slling return (0); 1666b1b8ab34Slling 1667b1b8ab34Slling if (errnum = get_objset_mdn(MOS, NULL, 1668b1b8ab34Slling ¤t_bootfs_obj, mdn, stack)) 1669b1b8ab34Slling return (0); 1670b1b8ab34Slling } else { 1671b35c6776Staylor if (errnum = get_objset_mdn(MOS, current_bootfs, 1672b35c6776Staylor ¤t_bootfs_obj, mdn, stack)) { 1673051aabe6Staylor grub_memset(current_bootfs, 0, MAXNAMELEN); 1674b1b8ab34Slling return (0); 1675b35c6776Staylor } 1676b1b8ab34Slling } 1677b1b8ab34Slling } 1678b1b8ab34Slling 1679b1b8ab34Slling if (dnode_get_path(mdn, filename, DNODE, stack)) { 1680b1b8ab34Slling errnum = ERR_FILE_NOT_FOUND; 1681b1b8ab34Slling return (0); 1682b1b8ab34Slling } 1683b1b8ab34Slling 1684b1b8ab34Slling /* get the file size and set the file position to 0 */ 16850a586ceaSMark Shellenbaum 16860a586ceaSMark Shellenbaum /* 16870a586ceaSMark Shellenbaum * For DMU_OT_SA we will need to locate the SIZE attribute 16880a586ceaSMark Shellenbaum * attribute, which could be either in the bonus buffer 16890a586ceaSMark Shellenbaum * or the "spill" block. 16900a586ceaSMark Shellenbaum */ 16910a586ceaSMark Shellenbaum if (DNODE->dn_bonustype == DMU_OT_SA) { 16920a586ceaSMark Shellenbaum sa_hdr_phys_t *sahdrp; 16930a586ceaSMark Shellenbaum int hdrsize; 16940a586ceaSMark Shellenbaum 16950a586ceaSMark Shellenbaum if (DNODE->dn_bonuslen != 0) { 16960a586ceaSMark Shellenbaum sahdrp = (sa_hdr_phys_t *)DN_BONUS(DNODE); 16970a586ceaSMark Shellenbaum } else { 16980a586ceaSMark Shellenbaum if (DNODE->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 16990a586ceaSMark Shellenbaum blkptr_t *bp = &DNODE->dn_spill; 17000a586ceaSMark Shellenbaum void *buf; 17010a586ceaSMark Shellenbaum 17020a586ceaSMark Shellenbaum buf = (void *)stack; 17030a586ceaSMark Shellenbaum stack += BP_GET_LSIZE(bp); 17040a586ceaSMark Shellenbaum 17050a586ceaSMark Shellenbaum /* reset errnum to rawread() failure */ 17060a586ceaSMark Shellenbaum errnum = 0; 17070a586ceaSMark Shellenbaum if (zio_read(bp, buf, stack) != 0) { 17080a586ceaSMark Shellenbaum return (0); 17090a586ceaSMark Shellenbaum } 17100a586ceaSMark Shellenbaum sahdrp = buf; 17110a586ceaSMark Shellenbaum } else { 17120a586ceaSMark Shellenbaum errnum = ERR_FSYS_CORRUPT; 17130a586ceaSMark Shellenbaum return (0); 17140a586ceaSMark Shellenbaum } 17150a586ceaSMark Shellenbaum } 17160a586ceaSMark Shellenbaum hdrsize = SA_HDR_SIZE(sahdrp); 17170a586ceaSMark Shellenbaum filemax = *(uint64_t *)((char *)sahdrp + hdrsize + 17180a586ceaSMark Shellenbaum SA_SIZE_OFFSET); 17190a586ceaSMark Shellenbaum } else { 17200a586ceaSMark Shellenbaum filemax = ((znode_phys_t *)DN_BONUS(DNODE))->zp_size; 17210a586ceaSMark Shellenbaum } 1722b1b8ab34Slling filepos = 0; 1723b1b8ab34Slling 1724b1b8ab34Slling dnode_buf = NULL; 1725b1b8ab34Slling return (1); 1726b1b8ab34Slling } 1727b1b8ab34Slling 1728b1b8ab34Slling /* 1729b1b8ab34Slling * zfs_read reads in the data blocks pointed by the DNODE. 1730b1b8ab34Slling * 1731b1b8ab34Slling * Return: 1732b1b8ab34Slling * len - the length successfully read in to the buffer 1733b1b8ab34Slling * 0 - failure 1734b1b8ab34Slling */ 1735b1b8ab34Slling int 1736b1b8ab34Slling zfs_read(char *buf, int len) 1737b1b8ab34Slling { 1738b1b8ab34Slling char *stack; 1739b1b8ab34Slling int blksz, length, movesize; 1740b1b8ab34Slling 1741b1b8ab34Slling if (file_buf == NULL) { 1742b1b8ab34Slling file_buf = stackbase; 1743b1b8ab34Slling stackbase += SPA_MAXBLOCKSIZE; 1744b1b8ab34Slling file_start = file_end = 0; 1745b1b8ab34Slling } 1746b1b8ab34Slling stack = stackbase; 1747b1b8ab34Slling 1748b1b8ab34Slling /* 1749b1b8ab34Slling * If offset is in memory, move it into the buffer provided and return. 1750b1b8ab34Slling */ 1751b1b8ab34Slling if (filepos >= file_start && filepos+len <= file_end) { 1752b1b8ab34Slling grub_memmove(buf, file_buf + filepos - file_start, len); 1753b1b8ab34Slling filepos += len; 1754b1b8ab34Slling return (len); 1755b1b8ab34Slling } 1756b1b8ab34Slling 1757b1b8ab34Slling blksz = DNODE->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1758b1b8ab34Slling 1759b1b8ab34Slling /* 1760b1b8ab34Slling * Entire Dnode is too big to fit into the space available. We 1761b1b8ab34Slling * will need to read it in chunks. This could be optimized to 1762b1b8ab34Slling * read in as large a chunk as there is space available, but for 1763b1b8ab34Slling * now, this only reads in one data block at a time. 1764b1b8ab34Slling */ 1765b1b8ab34Slling length = len; 1766b1b8ab34Slling while (length) { 1767b1b8ab34Slling /* 1768b1b8ab34Slling * Find requested blkid and the offset within that block. 1769b1b8ab34Slling */ 1770b1b8ab34Slling uint64_t blkid = filepos / blksz; 1771b1b8ab34Slling 1772b1b8ab34Slling if (errnum = dmu_read(DNODE, blkid, file_buf, stack)) 1773b1b8ab34Slling return (0); 1774b1b8ab34Slling 1775b1b8ab34Slling file_start = blkid * blksz; 1776b1b8ab34Slling file_end = file_start + blksz; 1777b1b8ab34Slling 1778b1b8ab34Slling movesize = MIN(length, file_end - filepos); 1779b1b8ab34Slling 1780b1b8ab34Slling grub_memmove(buf, file_buf + filepos - file_start, 1781b1b8ab34Slling movesize); 1782b1b8ab34Slling buf += movesize; 1783b1b8ab34Slling length -= movesize; 1784b1b8ab34Slling filepos += movesize; 1785b1b8ab34Slling } 1786b1b8ab34Slling 1787b1b8ab34Slling return (len); 1788b1b8ab34Slling } 1789b1b8ab34Slling 1790b1b8ab34Slling /* 1791b1b8ab34Slling * No-Op 1792b1b8ab34Slling */ 1793b1b8ab34Slling int 1794b1b8ab34Slling zfs_embed(int *start_sector, int needed_sectors) 1795b1b8ab34Slling { 1796b1b8ab34Slling return (1); 1797b1b8ab34Slling } 1798b1b8ab34Slling 1799b1b8ab34Slling #endif /* FSYS_ZFS */ 1800