diff options
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | crc32c.c | 103 | ||||
| -rw-r--r-- | crc32c.h | 27 | ||||
| -rw-r--r-- | ctree.h | 2 | ||||
| -rw-r--r-- | disk-io.c | 31 | ||||
| -rw-r--r-- | disk-io.h | 2 |
6 files changed, 166 insertions, 1 deletions
@@ -2,7 +2,7 @@ CC=gcc CFLAGS = -g -Wall -fno-strict-aliasing -Werror objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \ root-tree.o dir-item.o hash.o file-item.o inode-item.o \ - inode-map.o \ + inode-map.o crc32c.o\ # CHECKFLAGS=-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise \ -Wuninitialized -Wshadow -Wundef diff --git a/crc32c.c b/crc32c.c new file mode 100644 index 00000000..f07ba13c --- /dev/null +++ b/crc32c.c @@ -0,0 +1,103 @@ +/* + * Copied from the kernel source code, lib/libcrc32c.c. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ +#include "kerncompat.h" +#include "crc32c.h" + +/* + * This is the CRC-32C table + * Generated with: + * width = 32 bits + * poly = 0x1EDC6F41 + * reflect input bytes = true + * reflect output bytes = true + */ + +static const u32 crc32c_table[256] = { + 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, + 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, + 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, + 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, + 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, + 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, + 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, + 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, + 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, + 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, + 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, + 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, + 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, + 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, + 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, + 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, + 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, + 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, + 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, + 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, + 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, + 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, + 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, + 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, + 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, + 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, + 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, + 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, + 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, + 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, + 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, + 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, + 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, + 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, + 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, + 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, + 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, + 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, + 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, + 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, + 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, + 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, + 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, + 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, + 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, + 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, + 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, + 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, + 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, + 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, + 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, + 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, + 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, + 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, + 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, + 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, + 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, + 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, + 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, + 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, + 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, + 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, + 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, + 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L +}; + +/* + * Steps through buffer one byte at at time, calculates reflected + * crc using table. + */ + +u32 crc32c_le(u32 seed, unsigned char const *data, size_t length) +{ + u32 crc = (__force __u32)(cpu_to_le32(seed)); + + while (length--) + crc = + crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8); + + return le32_to_cpu((__force __le32)crc); +} diff --git a/crc32c.h b/crc32c.h new file mode 100644 index 00000000..6d20a953 --- /dev/null +++ b/crc32c.h @@ -0,0 +1,27 @@ +/* + * Copyright (C) 2007 Red Hat. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef __CRC32C__ +#define __CRC32C__ + +#include "kerncompat.h" + +u32 crc32c_le(u32 seed, unsigned char const *data, size_t length); + +#define crc32c(seed, data, length) crc32c_le(seed, (unsigned char const *)data, length) +#endif @@ -40,6 +40,8 @@ struct btrfs_trans_handle; /* 32 bytes in various csum fields */ #define BTRFS_CSUM_SIZE 32 +/* four bytes for CRC32 */ +#define BTRFS_CRC32_SIZE 4 #define BTRFS_FT_UNKNOWN 0 #define BTRFS_FT_REG_FILE 1 @@ -29,6 +29,7 @@ #include "ctree.h" #include "disk-io.h" #include "transaction.h" +#include "crc32c.h" static int allocated_blocks = 0; int cache_max = 10000; @@ -159,6 +160,30 @@ int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, return 0; } +int btrfs_csum_node(struct btrfs_root *root, struct btrfs_node *node) +{ + u32 crc; + size_t len = root->blocksize - BTRFS_CSUM_SIZE; + + crc = crc32c(0, (char *)(node) + BTRFS_CSUM_SIZE, len); + memcpy(node->header.csum, &crc, BTRFS_CRC32_SIZE); + return 0; +} + +int btrfs_csum_super(struct btrfs_root *root, struct btrfs_super_block *super) +{ + u32 crc; + char block[root->blocksize]; + size_t len = root->blocksize - BTRFS_CSUM_SIZE; + + memset(block, 0, root->blocksize); + memcpy(block, super, sizeof(*super)); + + crc = crc32c(0, block + BTRFS_CSUM_SIZE, len); + memcpy(super->csum, &crc, BTRFS_CRC32_SIZE); + return 0; +} + int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_buffer *buf) { @@ -169,6 +194,9 @@ int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, btrfs_map_bh_to_logical(root, buf, buf->blocknr); if (check_tree_block(root, buf)) BUG(); + + btrfs_csum_node(root, &buf->node); + ret = pwrite(buf->fd, &buf->node, root->blocksize, buf->dev_blocknr * root->blocksize); if (ret != root->blocksize) @@ -361,7 +389,10 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_super_block *s) { int ret; + btrfs_set_super_root(s, root->fs_info->tree_root->node->blocknr); + btrfs_csum_super(root, s); + ret = pwrite(root->fs_info->fp, s, sizeof(*s), BTRFS_SUPER_INFO_OFFSET); if (ret != sizeof(*s)) { @@ -51,6 +51,8 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_super_block *s); int btrfs_map_bh_to_logical(struct btrfs_root *root, struct btrfs_buffer *bh, u64 logical); +int btrfs_csum_super(struct btrfs_root *root, struct btrfs_super_block *super); +int btrfs_csum_node(struct btrfs_root *root, struct btrfs_node *node); #define BTRFS_SUPER_INFO_OFFSET (16 * 1024) #endif |