2007-03-23 00:13:20 +08:00
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#include <linux/module.h>
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#include <linux/fs.h>
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2007-03-29 01:57:48 +08:00
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#include <linux/blkdev.h>
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2007-03-29 07:44:27 +08:00
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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2007-02-02 22:18:22 +08:00
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#include "ctree.h"
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#include "disk-io.h"
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2007-03-17 04:20:31 +08:00
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#include "transaction.h"
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2007-02-02 22:18:22 +08:00
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2007-03-29 01:57:48 +08:00
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2007-03-23 00:13:20 +08:00
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static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-23 00:13:20 +08:00
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struct btrfs_node *node = btrfs_buffer_node(buf);
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2007-03-29 01:57:48 +08:00
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if (buf->b_blocknr != btrfs_header_blocknr(&node->header)) {
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2007-02-23 21:38:36 +08:00
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BUG();
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2007-03-29 01:57:48 +08:00
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}
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2007-03-23 00:13:20 +08:00
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if (root->node && btrfs_header_parentid(&node->header) !=
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2007-03-23 23:00:45 +08:00
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btrfs_header_parentid(btrfs_buffer_header(root->node))) {
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2007-03-24 03:56:19 +08:00
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BUG();
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2007-03-23 23:00:45 +08:00
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}
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2007-02-23 21:38:36 +08:00
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return 0;
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2007-02-02 22:18:22 +08:00
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}
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2007-03-29 01:57:48 +08:00
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struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr)
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{
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struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
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int blockbits = root->fs_info->sb->s_blocksize_bits;
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unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits);
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struct page *page;
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struct buffer_head *bh;
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struct buffer_head *head;
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struct buffer_head *ret = NULL;
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page = find_lock_page(mapping, index);
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if (!page)
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return NULL;
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if (!page_has_buffers(page))
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goto out_unlock;
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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_mapped(bh) && bh->b_blocknr == blocknr) {
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ret = bh;
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get_bh(bh);
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goto out_unlock;
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}
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bh = bh->b_this_page;
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} while (bh != head);
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out_unlock:
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unlock_page(page);
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page_cache_release(page);
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return ret;
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}
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struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root,
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u64 blocknr)
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{
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struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
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int blockbits = root->fs_info->sb->s_blocksize_bits;
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unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits);
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struct page *page;
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struct buffer_head *bh;
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struct buffer_head *head;
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struct buffer_head *ret = NULL;
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u64 first_block = index << (PAGE_CACHE_SHIFT - blockbits);
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page = grab_cache_page(mapping, index);
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if (!page)
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return NULL;
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if (!page_has_buffers(page))
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create_empty_buffers(page, root->fs_info->sb->s_blocksize, 0);
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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_mapped(bh)) {
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bh->b_bdev = root->fs_info->sb->s_bdev;
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bh->b_blocknr = first_block;
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set_buffer_mapped(bh);
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}
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if (bh->b_blocknr == blocknr) {
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ret = bh;
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get_bh(bh);
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goto out_unlock;
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}
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bh = bh->b_this_page;
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first_block++;
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} while (bh != head);
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out_unlock:
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unlock_page(page);
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page_cache_release(page);
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return ret;
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}
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static sector_t max_block(struct block_device *bdev)
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{
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sector_t retval = ~((sector_t)0);
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loff_t sz = i_size_read(bdev->bd_inode);
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if (sz) {
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unsigned int size = block_size(bdev);
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unsigned int sizebits = blksize_bits(size);
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retval = (sz >> sizebits);
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}
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return retval;
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}
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static int btree_get_block(struct inode *inode, sector_t iblock,
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struct buffer_head *bh, int create)
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{
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if (iblock >= max_block(inode->i_sb->s_bdev)) {
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if (create)
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return -EIO;
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/*
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* for reads, we're just trying to fill a partial page.
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* return a hole, they will have to call get_block again
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* before they can fill it, and they will get -EIO at that
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* time
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*/
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return 0;
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}
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bh->b_bdev = inode->i_sb->s_bdev;
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bh->b_blocknr = iblock;
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set_buffer_mapped(bh);
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return 0;
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}
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2007-03-29 07:44:27 +08:00
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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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2007-03-29 01:57:48 +08:00
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static int btree_writepage(struct page *page, struct writeback_control *wbc)
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2007-03-02 07:59:40 +08:00
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{
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2007-03-29 07:44:27 +08:00
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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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2007-03-29 01:57:48 +08:00
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return block_write_full_page(page, btree_get_block, wbc);
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2007-03-02 07:59:40 +08:00
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}
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2007-03-29 01:57:48 +08:00
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static int btree_readpage(struct file * file, struct page * page)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-29 01:57:48 +08:00
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return block_read_full_page(page, btree_get_block);
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2007-02-02 22:18:22 +08:00
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}
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2007-03-29 01:57:48 +08:00
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static struct address_space_operations btree_aops = {
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.readpage = btree_readpage,
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.writepage = btree_writepage,
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.sync_page = block_sync_page,
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};
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2007-03-23 00:13:20 +08:00
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struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-29 01:57:48 +08:00
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struct buffer_head *bh = NULL;
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2007-02-02 22:18:22 +08:00
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2007-03-29 01:57:48 +08:00
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bh = btrfs_find_create_tree_block(root, blocknr);
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if (!bh)
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return bh;
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lock_buffer(bh);
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if (!buffer_uptodate(bh)) {
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get_bh(bh);
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bh->b_end_io = end_buffer_read_sync;
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submit_bh(READ, bh);
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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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2007-03-29 07:44:27 +08:00
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csum_tree_block(root, bh, 1);
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2007-03-29 01:57:48 +08:00
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} else {
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unlock_buffer(bh);
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}
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if (check_tree_block(root, bh))
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2007-02-22 06:04:57 +08:00
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BUG();
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2007-03-29 01:57:48 +08:00
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return bh;
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fail:
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brelse(bh);
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return NULL;
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2007-02-02 22:18:22 +08:00
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}
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2007-03-17 04:20:31 +08:00
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int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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2007-03-23 00:13:20 +08:00
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struct buffer_head *buf)
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2007-03-02 07:59:40 +08:00
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{
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2007-03-23 00:13:20 +08:00
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mark_buffer_dirty(buf);
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2007-03-02 07:59:40 +08:00
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return 0;
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}
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2007-03-17 04:20:31 +08:00
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int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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2007-03-23 00:13:20 +08:00
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struct buffer_head *buf)
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2007-03-02 07:59:40 +08:00
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{
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2007-03-23 00:13:20 +08:00
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clear_buffer_dirty(buf);
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2007-03-02 07:59:40 +08:00
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return 0;
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}
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2007-03-15 02:14:43 +08:00
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static int __setup_root(struct btrfs_super_block *super,
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2007-03-21 02:38:32 +08:00
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struct btrfs_root *root,
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struct btrfs_fs_info *fs_info,
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2007-03-23 00:13:20 +08:00
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u64 objectid)
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2007-02-21 05:40:44 +08:00
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{
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2007-02-22 06:04:57 +08:00
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root->node = NULL;
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2007-03-07 09:08:01 +08:00
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root->commit_root = NULL;
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2007-03-15 02:14:43 +08:00
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root->blocksize = btrfs_super_blocksize(super);
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root->ref_cows = 0;
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2007-03-21 02:38:32 +08:00
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root->fs_info = fs_info;
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2007-03-14 04:47:54 +08:00
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memset(&root->root_key, 0, sizeof(root->root_key));
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memset(&root->root_item, 0, sizeof(root->root_item));
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return 0;
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}
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2007-03-15 02:14:43 +08:00
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static int find_and_setup_root(struct btrfs_super_block *super,
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2007-03-21 02:38:32 +08:00
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struct btrfs_root *tree_root,
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struct btrfs_fs_info *fs_info,
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u64 objectid,
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2007-03-23 00:13:20 +08:00
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struct btrfs_root *root)
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2007-03-14 04:47:54 +08:00
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{
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int ret;
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2007-03-23 00:13:20 +08:00
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__setup_root(super, root, fs_info, objectid);
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2007-03-14 04:47:54 +08:00
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ret = btrfs_find_last_root(tree_root, objectid,
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&root->root_item, &root->root_key);
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BUG_ON(ret);
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root->node = read_tree_block(root,
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btrfs_root_blocknr(&root->root_item));
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BUG_ON(!root->node);
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2007-02-21 05:40:44 +08:00
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return 0;
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}
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2007-03-23 00:13:20 +08:00
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struct btrfs_root *open_ctree(struct super_block *sb,
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struct buffer_head *sb_buffer,
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struct btrfs_super_block *disk_super)
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2007-03-21 23:12:56 +08:00
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{
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2007-03-23 00:13:20 +08:00
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struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
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GFP_NOFS);
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2007-02-02 22:18:22 +08:00
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int ret;
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2007-03-29 07:44:27 +08:00
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if (!btrfs_super_root(disk_super)) {
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2007-03-23 00:13:20 +08:00
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return NULL;
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2007-03-29 07:44:27 +08:00
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}
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2007-03-26 22:15:30 +08:00
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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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2007-03-29 01:57:48 +08:00
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sb_set_blocksize(sb, sb_buffer->b_size);
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2007-03-21 02:38:32 +08:00
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fs_info->running_transaction = NULL;
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fs_info->fs_root = root;
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fs_info->tree_root = tree_root;
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fs_info->extent_root = extent_root;
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fs_info->inode_root = inode_root;
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fs_info->last_inode_alloc = 0;
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fs_info->last_inode_alloc_dirid = 0;
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2007-03-23 00:13:20 +08:00
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fs_info->disk_super = disk_super;
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fs_info->sb = sb;
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2007-03-29 01:57:48 +08:00
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fs_info->btree_inode = new_inode(sb);
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fs_info->btree_inode->i_ino = 1;
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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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2007-03-29 07:44:27 +08:00
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fs_info->hash_tfm = crypto_alloc_hash("sha256", 0, CRYPTO_ALG_ASYNC);
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2007-03-29 21:59:15 +08:00
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spin_lock_init(&fs_info->hash_lock);
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if (!fs_info->hash_tfm || IS_ERR(fs_info->hash_tfm)) {
|
2007-03-29 07:44:27 +08:00
|
|
|
printk("failed to allocate sha256 hash\n");
|
|
|
|
return NULL;
|
|
|
|
}
|
2007-03-29 01:57:48 +08:00
|
|
|
|
2007-03-23 03:59:16 +08:00
|
|
|
mutex_init(&fs_info->trans_mutex);
|
2007-03-24 07:47:49 +08:00
|
|
|
mutex_init(&fs_info->fs_mutex);
|
2007-03-21 02:38:32 +08:00
|
|
|
memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
|
|
|
|
memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
|
2007-03-14 04:47:54 +08:00
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
__setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
|
2007-03-29 01:57:48 +08:00
|
|
|
|
|
|
|
fs_info->sb_buffer = read_tree_block(tree_root, sb_buffer->b_blocknr);
|
|
|
|
|
2007-03-29 07:44:27 +08:00
|
|
|
if (!fs_info->sb_buffer) {
|
|
|
|
printk("failed2\n");
|
2007-03-29 01:57:48 +08:00
|
|
|
return NULL;
|
2007-03-29 07:44:27 +08:00
|
|
|
}
|
2007-03-29 01:57:48 +08:00
|
|
|
brelse(sb_buffer);
|
|
|
|
sb_buffer = NULL;
|
|
|
|
disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
|
|
|
|
fs_info->disk_super = disk_super;
|
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
tree_root->node = read_tree_block(tree_root,
|
|
|
|
btrfs_super_root(disk_super));
|
2007-03-14 04:47:54 +08:00
|
|
|
BUG_ON(!tree_root->node);
|
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
ret = find_and_setup_root(disk_super, tree_root, fs_info,
|
|
|
|
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
|
2007-03-14 04:47:54 +08:00
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
ret = find_and_setup_root(disk_super, tree_root, fs_info,
|
|
|
|
BTRFS_INODE_MAP_OBJECTID, inode_root);
|
2007-03-21 02:38:32 +08:00
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
ret = find_and_setup_root(disk_super, tree_root, fs_info,
|
|
|
|
BTRFS_FS_TREE_OBJECTID, root);
|
2007-03-14 04:47:54 +08:00
|
|
|
BUG_ON(ret);
|
2007-03-07 09:08:01 +08:00
|
|
|
root->commit_root = root->node;
|
2007-03-23 00:13:20 +08:00
|
|
|
get_bh(root->node);
|
2007-03-14 04:47:54 +08:00
|
|
|
root->ref_cows = 1;
|
2007-03-21 03:57:25 +08:00
|
|
|
root->fs_info->generation = root->root_key.offset + 1;
|
2007-02-02 22:18:22 +08:00
|
|
|
return root;
|
|
|
|
}
|
|
|
|
|
2007-03-17 04:20:31 +08:00
|
|
|
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
|
2007-03-23 03:59:16 +08:00
|
|
|
*root)
|
2007-02-02 22:18:22 +08:00
|
|
|
{
|
2007-03-23 22:01:08 +08:00
|
|
|
struct buffer_head *bh = root->fs_info->sb_buffer;
|
|
|
|
btrfs_set_super_root(root->fs_info->disk_super,
|
|
|
|
root->fs_info->tree_root->node->b_blocknr);
|
|
|
|
lock_buffer(bh);
|
|
|
|
clear_buffer_dirty(bh);
|
2007-03-29 07:44:27 +08:00
|
|
|
csum_tree_block(root, bh, 0);
|
2007-03-23 22:01:08 +08:00
|
|
|
bh->b_end_io = end_buffer_write_sync;
|
|
|
|
get_bh(bh);
|
|
|
|
submit_bh(WRITE, bh);
|
|
|
|
wait_on_buffer(bh);
|
|
|
|
if (!buffer_uptodate(bh)) {
|
|
|
|
WARN_ON(1);
|
|
|
|
return -EIO;
|
2007-02-22 06:04:57 +08:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
int close_ctree(struct btrfs_root *root)
|
2007-02-22 06:04:57 +08:00
|
|
|
{
|
2007-03-14 04:47:54 +08:00
|
|
|
int ret;
|
2007-03-17 04:20:31 +08:00
|
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
|
2007-03-23 03:59:16 +08:00
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
|
|
btrfs_commit_transaction(trans, root);
|
|
|
|
/* run commit again to drop the original snapshot */
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
|
|
btrfs_commit_transaction(trans, root);
|
|
|
|
ret = btrfs_write_and_wait_transaction(NULL, root);
|
2007-03-14 04:47:54 +08:00
|
|
|
BUG_ON(ret);
|
2007-03-23 03:59:16 +08:00
|
|
|
write_ctree_super(NULL, root);
|
2007-03-02 07:59:40 +08:00
|
|
|
|
2007-02-22 06:04:57 +08:00
|
|
|
if (root->node)
|
2007-03-13 22:46:10 +08:00
|
|
|
btrfs_block_release(root, root->node);
|
2007-03-21 02:38:32 +08:00
|
|
|
if (root->fs_info->extent_root->node)
|
|
|
|
btrfs_block_release(root->fs_info->extent_root,
|
|
|
|
root->fs_info->extent_root->node);
|
|
|
|
if (root->fs_info->inode_root->node)
|
|
|
|
btrfs_block_release(root->fs_info->inode_root,
|
|
|
|
root->fs_info->inode_root->node);
|
|
|
|
if (root->fs_info->tree_root->node)
|
|
|
|
btrfs_block_release(root->fs_info->tree_root,
|
|
|
|
root->fs_info->tree_root->node);
|
2007-03-13 22:46:10 +08:00
|
|
|
btrfs_block_release(root, root->commit_root);
|
2007-03-23 00:13:20 +08:00
|
|
|
btrfs_block_release(root, root->fs_info->sb_buffer);
|
2007-03-29 07:44:27 +08:00
|
|
|
crypto_free_hash(root->fs_info->hash_tfm);
|
2007-03-29 21:59:15 +08:00
|
|
|
truncate_inode_pages(root->fs_info->btree_inode->i_mapping, 0);
|
2007-03-29 01:57:48 +08:00
|
|
|
iput(root->fs_info->btree_inode);
|
2007-03-23 00:13:20 +08:00
|
|
|
kfree(root->fs_info->extent_root);
|
|
|
|
kfree(root->fs_info->inode_root);
|
|
|
|
kfree(root->fs_info->tree_root);
|
|
|
|
kfree(root->fs_info);
|
|
|
|
kfree(root);
|
2007-02-02 22:18:22 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
|
2007-02-02 22:18:22 +08:00
|
|
|
{
|
2007-03-23 00:13:20 +08:00
|
|
|
brelse(buf);
|
2007-02-02 22:18:22 +08:00
|
|
|
}
|
|
|
|
|