csum.c revision 4efbac6fed75c29d3d5f1b676b932754653a2ac5
1ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos/* 2ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * csum.c --- checksumming of ext3 structures 3ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * 4ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * Copyright (C) 2006 Cluster File Systems, Inc. 5470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o * Copyright (C) 2006, 2007 by Andreas Dilger <adilger@clusterfs.com> 6ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * 7ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * %Begin-Header% 8ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * This file may be redistributed under the terms of the GNU Public 9ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * License. 10ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * %End-Header% 11ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos */ 12ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 130eeec8ac61bf1eaa31533b2be825cd75580829c9Theodore Ts'o#if HAVE_SYS_TYPES_H 140eeec8ac61bf1eaa31533b2be825cd75580829c9Theodore Ts'o#include <sys/types.h> 150eeec8ac61bf1eaa31533b2be825cd75580829c9Theodore Ts'o#endif 160eeec8ac61bf1eaa31533b2be825cd75580829c9Theodore Ts'o 17ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#include "ext2_fs.h" 18ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#include "ext2fs.h" 19ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#include "crc16.h" 20ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#include <assert.h> 21ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 22ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#ifndef offsetof 23ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 24ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#endif 25ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 26ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#ifdef DEBUG 27ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#define STATIC 28ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#else 29ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#define STATIC static 30ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#endif 31ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 32ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. SantosSTATIC __u16 ext2fs_group_desc_csum(ext2_filsys fs, dgrp_t group) 33ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos{ 34ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos __u16 crc = 0; 35ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos struct ext2_group_desc *desc; 36ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 37ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos desc = &fs->group_desc[group]; 38ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 39ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { 40ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos int offset = offsetof(struct ext2_group_desc, bg_checksum); 41ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 42ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#ifdef WORDS_BIGENDIAN 43ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos struct ext2_group_desc swabdesc = *desc; 44ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 45ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos /* Have to swab back to little-endian to do the checksum */ 46ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos ext2fs_swap_group_desc(&swabdesc); 47ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos desc = &swabdesc; 48ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 49ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos group = ext2fs_swab32(group); 50ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#endif 51c4dcb1c10ae5e3d523823fe0a2c84d0841ca2ea1Theodore Ts'o crc = ext2fs_crc16(~0, fs->super->s_uuid, 52c4dcb1c10ae5e3d523823fe0a2c84d0841ca2ea1Theodore Ts'o sizeof(fs->super->s_uuid)); 53c4dcb1c10ae5e3d523823fe0a2c84d0841ca2ea1Theodore Ts'o crc = ext2fs_crc16(crc, &group, sizeof(group)); 54c4dcb1c10ae5e3d523823fe0a2c84d0841ca2ea1Theodore Ts'o crc = ext2fs_crc16(crc, desc, offset); 55ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos offset += sizeof(desc->bg_checksum); /* skip checksum */ 56ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos assert(offset == sizeof(*desc)); 57ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos /* for checksum of struct ext4_group_desc do the rest...*/ 58ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos if (offset < fs->super->s_desc_size) { 59c4dcb1c10ae5e3d523823fe0a2c84d0841ca2ea1Theodore Ts'o crc = ext2fs_crc16(crc, (char *)desc + offset, 60ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos fs->super->s_desc_size - offset); 61ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos } 62ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos } 63ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 64ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos return crc; 65ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos} 66ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 67ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santosint ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group) 68ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos{ 694729455f0a68f2fa0a83ec8460d1d4bccba9dcfaTheodore Ts'o if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 704729455f0a68f2fa0a83ec8460d1d4bccba9dcfaTheodore Ts'o EXT4_FEATURE_RO_COMPAT_GDT_CSUM) && 71efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o (fs->group_desc[group].bg_checksum != 724729455f0a68f2fa0a83ec8460d1d4bccba9dcfaTheodore Ts'o ext2fs_group_desc_csum(fs, group))) 73ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos return 0; 74ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 75ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos return 1; 76ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos} 77ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 78ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santosvoid ext2fs_group_desc_csum_set(ext2_filsys fs, dgrp_t group) 79ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos{ 805711ed297b1a3d94086256b5b3b891d4f77b21caTheodore Ts'o if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 815711ed297b1a3d94086256b5b3b891d4f77b21caTheodore Ts'o EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) 825711ed297b1a3d94086256b5b3b891d4f77b21caTheodore Ts'o fs->group_desc[group].bg_checksum = 835711ed297b1a3d94086256b5b3b891d4f77b21caTheodore Ts'o ext2fs_group_desc_csum(fs, group); 84ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos} 85ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 86ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santosstatic __u32 find_last_inode_ingrp(ext2fs_inode_bitmap bitmap, 87ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos __u32 inodes_per_grp, dgrp_t grp_no) 88ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos{ 89ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos ext2_ino_t i, start_ino, end_ino; 90ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 91ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos start_ino = grp_no * inodes_per_grp + 1; 92ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos end_ino = start_ino + inodes_per_grp - 1; 93ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 94ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos for (i = end_ino; i >= start_ino; i--) { 958f82ef9860339039b54a324be137fbc09b762358Valerie Aurora Henson if (ext2fs_fast_test_inode_bitmap2(bitmap, i)) 96ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos return i - start_ino + 1; 97ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos } 98ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos return inodes_per_grp; 99ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos} 100ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 101ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos/* update the bitmap flags, set the itable high watermark, and calculate 102ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos * checksums for the group descriptors */ 103f628acea2671dda839fc086f1017718e41e34ecaAndreas Dilgererrcode_t ext2fs_set_gdt_csum(ext2_filsys fs) 104ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos{ 105ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos struct ext2_super_block *sb = fs->super; 106ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos struct ext2_group_desc *bg = fs->group_desc; 1078895f43a60269464f654e9d87c28768875cd703aTheodore Ts'o int dirty = 0; 108ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos dgrp_t i; 109ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 110f628acea2671dda839fc086f1017718e41e34ecaAndreas Dilger if (!fs->inode_map) 111f628acea2671dda839fc086f1017718e41e34ecaAndreas Dilger return EXT2_ET_NO_INODE_BITMAP; 112f628acea2671dda839fc086f1017718e41e34ecaAndreas Dilger 11316b851cdae98244e117fe91d93b267fcad1102b3Theodore Ts'o if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 11416b851cdae98244e117fe91d93b267fcad1102b3Theodore Ts'o EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) 115f628acea2671dda839fc086f1017718e41e34ecaAndreas Dilger return 0; 116ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 117ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos for (i = 0; i < fs->group_desc_count; i++, bg++) { 118ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos int old_csum = bg->bg_checksum; 11980fc4e698a308de22ace6179f45e0bb67befa74bAndreas Dilger int old_unused = bg->bg_itable_unused; 12080fc4e698a308de22ace6179f45e0bb67befa74bAndreas Dilger int old_flags = bg->bg_flags; 121ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 12216b851cdae98244e117fe91d93b267fcad1102b3Theodore Ts'o if (bg->bg_free_inodes_count == sb->s_inodes_per_group) { 12316b851cdae98244e117fe91d93b267fcad1102b3Theodore Ts'o bg->bg_flags |= EXT2_BG_INODE_UNINIT; 12416b851cdae98244e117fe91d93b267fcad1102b3Theodore Ts'o bg->bg_itable_unused = sb->s_inodes_per_group; 12516b851cdae98244e117fe91d93b267fcad1102b3Theodore Ts'o } else { 126ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos bg->bg_flags &= ~EXT2_BG_INODE_UNINIT; 127ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos bg->bg_itable_unused = sb->s_inodes_per_group - 128ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos find_last_inode_ingrp(fs->inode_map, 129ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos sb->s_inodes_per_group,i); 130ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos } 131ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos 132ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos ext2fs_group_desc_csum_set(fs, i); 13380fc4e698a308de22ace6179f45e0bb67befa74bAndreas Dilger if (old_flags != bg->bg_flags) 13480fc4e698a308de22ace6179f45e0bb67befa74bAndreas Dilger dirty = 1; 13580fc4e698a308de22ace6179f45e0bb67befa74bAndreas Dilger if (old_unused != bg->bg_itable_unused) 13680fc4e698a308de22ace6179f45e0bb67befa74bAndreas Dilger dirty = 1; 137ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos if (old_csum != bg->bg_checksum) 138ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos dirty = 1; 139ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos } 140ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos if (dirty) 141ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos ext2fs_mark_super_dirty(fs); 142f628acea2671dda839fc086f1017718e41e34ecaAndreas Dilger return 0; 143ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos} 144470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 145470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o#ifdef DEBUG 146470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'ovoid print_csum(const char *msg, ext2_filsys fs, dgrp_t group) 147470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o{ 148470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o __u16 crc1, crc2, crc3; 149470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o dgrp_t swabgroup; 150470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o struct ext2_group_desc *desc = &fs->group_desc[group]; 151470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o struct ext2_super_block *sb = fs->super; 152470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 153470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o#ifdef WORDS_BIGENDIAN 154470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o struct ext2_group_desc swabdesc = fs->group_desc[group]; 155470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 156470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o /* Have to swab back to little-endian to do the checksum */ 157470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o ext2fs_swap_group_desc(&swabdesc); 158470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o desc = &swabdesc; 159470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 160470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o swabgroup = ext2fs_swab32(group); 161470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o#else 162470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o swabgroup = group; 163470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o#endif 164470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 165470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o crc1 = ext2fs_crc16(~0, sb->s_uuid, sizeof(fs->super->s_uuid)); 166470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o crc2 = ext2fs_crc16(crc1, &swabgroup, sizeof(swabgroup)); 167470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o crc3 = ext2fs_crc16(crc2, desc, 168470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o offsetof(struct ext2_group_desc, bg_checksum)); 169470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("%s: UUID %016Lx%016Lx(%04x), grp %u(%04x): %04x=%04x\n", 170470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o msg, *(long long *)&sb->s_uuid, *(long long *)&sb->s_uuid[8], 171470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o crc1, group, crc2, crc3, ext2fs_group_desc_csum(fs, group)); 172470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o} 173470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 174470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'ounsigned char sb_uuid[16] = { 0x4f, 0x25, 0xe8, 0xcf, 0xe7, 0x97, 0x48, 0x23, 175470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 0xbe, 0xfa, 0xa7, 0x88, 0x4b, 0xae, 0xec, 0xdb }; 176470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 177470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'oint main(int argc, char **argv) 178470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o{ 179470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o struct ext2_super_block param; 180470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o errcode_t retval; 181470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o ext2_filsys fs; 182470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o int i; 183470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o __u16 csum1, csum2, csum_known = 0xd3a4; 184470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 185470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o memset(¶m, 0, sizeof(param)); 1864efbac6fed75c29d3d5f1b676b932754653a2ac5Valerie Aurora Henson ext2fs_blocks_count_set(¶m, 32768); 187470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 1888f82ef9860339039b54a324be137fbc09b762358Valerie Aurora Henson retval = ext2fs_initialize("test fs", EXT2_FLAG_64BITS, ¶m, 189470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o test_io_manager, &fs); 190470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (retval) { 191470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o com_err("setup", retval, 192470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o "While initializing filesystem"); 193470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 194470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 195470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o memcpy(fs->super->s_uuid, sb_uuid, 16); 196470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->super->s_feature_ro_compat = EXT4_FEATURE_RO_COMPAT_GDT_CSUM; 197470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 198470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o for (i=0; i < fs->group_desc_count; i++) { 199470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_block_bitmap = 124; 200470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_inode_bitmap = 125; 201470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_inode_table = 126; 202470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_free_blocks_count = 31119; 203470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_free_inodes_count = 15701; 204470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_used_dirs_count = 2; 205470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[i].bg_flags = 0; 206470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o }; 207470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 208470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o csum1 = ext2fs_group_desc_csum(fs, 0); 209470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("csum0000", fs, 0); 210470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 211470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (csum1 != csum_known) { 212470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksum for group 0 should be %04x\n", csum_known); 213470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 214470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 215470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o csum2 = ext2fs_group_desc_csum(fs, 1); 216470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("csum0001", fs, 1); 217470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (csum1 == csum2) { 218470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksums for different groups shouldn't match\n"); 219470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 220470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 221470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o csum2 = ext2fs_group_desc_csum(fs, 2); 222470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("csumffff", fs, 2); 223470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (csum1 == csum2) { 224470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksums for different groups shouldn't match\n"); 225470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 226470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 227470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[0].bg_checksum = csum1; 228470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o csum2 = ext2fs_group_desc_csum(fs, 0); 229470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("csum_set", fs, 0); 230470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (csum1 != csum2) { 231470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksums should not depend on checksum field\n"); 232470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 233470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 234470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (!ext2fs_group_desc_csum_verify(fs, 0)) { 235470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksums should verify against gd_checksum\n"); 236470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 237470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 238470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o memset(fs->super->s_uuid, 0x30, sizeof(fs->super->s_uuid)); 239470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("new_uuid", fs, 0); 240470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (ext2fs_group_desc_csum_verify(fs, 0) != 0) { 241470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksums for different filesystems shouldn't match\n"); 242470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 243470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 244470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o csum1 = fs->group_desc[0].bg_checksum = ext2fs_group_desc_csum(fs, 0); 245470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("csum_new", fs, 0); 246470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o fs->group_desc[0].bg_free_blocks_count = 1; 247470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o csum2 = ext2fs_group_desc_csum(fs, 0); 248470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o print_csum("csum_blk", fs, 0); 249470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o if (csum1 == csum2) { 250470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o printf("checksums for different data shouldn't match\n"); 251470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o exit(1); 252470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o } 253470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o 254470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o return 0; 255470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o} 256470e737a872918afd9067de1ce92d571d5671d40Theodore Ts'o#endif 257