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Btrfs: verify csums on read

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-03-29 15:15:27 -04:00
committed by David Woodhouse
parent 75dfe3960e
commit f254e52c1c
6 changed files with 279 additions and 60 deletions
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37
fs/btrfs/disk-io.c
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@@ -127,31 +127,46 @@ static int btree_get_block(struct inode *inode, sector_t iblock,
return 0;
}
static int csum_tree_block(struct btrfs_root * root, struct buffer_head *bh,
int verify)
int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
char *result)
{
struct btrfs_node *node = btrfs_buffer_node(bh);
struct scatterlist sg;
struct crypto_hash *tfm = root->fs_info->hash_tfm;
struct hash_desc desc;
int ret;
char result[32];
desc.tfm = tfm;
desc.flags = 0;
sg_init_one(&sg, bh->b_data + 32, bh->b_size - 32);
sg_init_one(&sg, data, len);
spin_lock(&root->fs_info->hash_lock);
ret = crypto_hash_digest(&desc, &sg, bh->b_size - 32, result);
ret = crypto_hash_digest(&desc, &sg, len, result);
spin_unlock(&root->fs_info->hash_lock);
if (ret) {
printk("sha256 digest failed\n");
}
return ret;
}
static int csum_tree_block(struct btrfs_root *root, struct buffer_head *bh,
int verify)
{
char result[BTRFS_CSUM_SIZE];
int ret;
struct btrfs_node *node;
ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
bh->b_size - BTRFS_CSUM_SIZE, result);
if (ret)
return ret;
if (verify) {
if (memcmp(node->header.csum, result, sizeof(result)))
printk("csum verify failed on %Lu\n", bh->b_blocknr);
return -EINVAL;
} else
memcpy(node->header.csum, result, sizeof(node->header.csum));
if (memcmp(bh->b_data, result, BTRFS_CSUM_SIZE)) {
printk("checksum verify failed on %lu\n",
bh->b_blocknr);
return 1;
}
} else {
node = btrfs_buffer_node(bh);
memcpy(&node->header.csum, result, BTRFS_CSUM_SIZE);
}
return 0;
}