Btrfs: sha256 csums on metadata
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
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d98237b3ed
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87cbda5c1f
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@ -51,11 +51,11 @@ struct btrfs_key {
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* every tree block (leaf or node) starts with this header.
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*/
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struct btrfs_header {
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__le32 csum[8];
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u8 fsid[16]; /* FS specific uuid */
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__le64 blocknr; /* which block this node is supposed to live in */
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__le64 generation;
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__le64 parentid; /* objectid of the tree root */
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__le32 csum;
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__le32 ham;
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__le16 nritems;
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__le16 flags;
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@ -75,9 +75,10 @@ struct buffer_head;
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* it currently lacks any block count etc etc
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*/
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struct btrfs_super_block {
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__le32 csum[8];
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/* the first 3 fields must match struct btrfs_header */
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u8 fsid[16]; /* FS specific uuid */
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__le64 blocknr; /* this block number */
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__le32 csum;
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__le64 magic;
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__le32 blocksize;
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__le64 generation;
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@ -217,6 +218,7 @@ struct btrfs_inode_map_item {
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struct btrfs_disk_key key;
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} __attribute__ ((__packed__));
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struct crypto_hash;
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struct btrfs_fs_info {
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struct btrfs_root *fs_root;
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struct btrfs_root *extent_root;
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@ -236,6 +238,8 @@ struct btrfs_fs_info {
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struct inode *btree_inode;
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struct mutex trans_mutex;
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struct mutex fs_mutex;
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struct crypto_hash *hash_tfm;
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spinlock_t hash_lock;
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};
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/*
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@ -1,6 +1,8 @@
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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@ -126,8 +128,51 @@ static int btree_get_block(struct inode *inode, sector_t iblock,
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return 0;
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}
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static int csum_tree_block(struct btrfs_root * root, struct buffer_head *bh,
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int verify)
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{
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struct btrfs_node *node = btrfs_buffer_node(bh);
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struct scatterlist sg;
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struct crypto_hash *tfm = root->fs_info->hash_tfm;
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struct hash_desc desc;
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int ret;
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char result[32];
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desc.tfm = tfm;
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desc.flags = 0;
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sg_init_one(&sg, bh->b_data + 32, bh->b_size - 32);
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spin_lock(&root->fs_info->hash_lock);
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ret = crypto_hash_digest(&desc, &sg, bh->b_size - 32, result);
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spin_unlock(&root->fs_info->hash_lock);
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if (ret) {
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printk("sha256 digest failed\n");
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}
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if (verify) {
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if (memcmp(node->header.csum, result, sizeof(result)))
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printk("csum verify failed on %Lu\n", bh->b_blocknr);
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return -EINVAL;
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} else
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memcpy(node->header.csum, result, sizeof(node->header.csum));
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return 0;
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}
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static int btree_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct buffer_head *bh;
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struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb);
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struct buffer_head *head;
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if (!page_has_buffers(page)) {
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create_empty_buffers(page, root->fs_info->sb->s_blocksize,
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(1 << BH_Dirty)|(1 << BH_Uptodate));
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}
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head = page_buffers(page);
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bh = head;
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do {
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if (buffer_dirty(bh))
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csum_tree_block(root, bh, 0);
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bh = bh->b_this_page;
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} while (bh != head);
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return block_write_full_page(page, btree_get_block, wbc);
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}
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@ -157,6 +202,7 @@ struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh))
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goto fail;
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csum_tree_block(root, bh, 1);
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} else {
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unlock_buffer(bh);
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}
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@ -233,8 +279,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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GFP_NOFS);
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int ret;
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if (!btrfs_super_root(disk_super))
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if (!btrfs_super_root(disk_super)) {
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return NULL;
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}
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init_bit_radix(&fs_info->pinned_radix);
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init_bit_radix(&fs_info->pending_del_radix);
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sb_set_blocksize(sb, sb_buffer->b_size);
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@ -252,6 +299,12 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
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fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
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mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
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fs_info->hash_tfm = crypto_alloc_hash("sha256", 0, CRYPTO_ALG_ASYNC);
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if (!fs_info->hash_tfm) {
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printk("failed to allocate sha256 hash\n");
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return NULL;
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}
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spin_lock_init(&fs_info->hash_lock);
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mutex_init(&fs_info->trans_mutex);
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mutex_init(&fs_info->fs_mutex);
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@ -262,9 +315,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info->sb_buffer = read_tree_block(tree_root, sb_buffer->b_blocknr);
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if (!fs_info->sb_buffer)
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if (!fs_info->sb_buffer) {
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printk("failed2\n");
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return NULL;
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}
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brelse(sb_buffer);
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sb_buffer = NULL;
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disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
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@ -300,6 +354,7 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
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root->fs_info->tree_root->node->b_blocknr);
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lock_buffer(bh);
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clear_buffer_dirty(bh);
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csum_tree_block(root, bh, 0);
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bh->b_end_io = end_buffer_write_sync;
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get_bh(bh);
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submit_bh(WRITE, bh);
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@ -338,6 +393,7 @@ int close_ctree(struct btrfs_root *root)
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root->fs_info->tree_root->node);
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btrfs_block_release(root, root->commit_root);
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btrfs_block_release(root, root->fs_info->sb_buffer);
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crypto_free_hash(root->fs_info->hash_tfm);
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iput(root->fs_info->btree_inode);
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kfree(root->fs_info->extent_root);
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kfree(root->fs_info->inode_root);
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@ -473,13 +473,13 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
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}
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disk_super = (struct btrfs_super_block *)bh->b_data;
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root = open_ctree(sb, bh, disk_super);
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sb->s_fs_info = root;
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disk_super = root->fs_info->disk_super;
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if (!root) {
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printk("btrfs: open_ctree failed\n");
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return -EIO;
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}
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sb->s_fs_info = root;
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disk_super = root->fs_info->disk_super;
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printk("read in super total blocks %Lu root %Lu\n",
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btrfs_super_total_blocks(disk_super),
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btrfs_super_root_dir(disk_super));
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