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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2007-03-30 20:47:31 +08:00
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#include <linux/swap.h>
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2007-04-09 22:42:37 +08:00
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#include <linux/radix-tree.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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2007-04-09 22:42:37 +08:00
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#include "btrfs_inode.h"
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2007-02-02 22:18:22 +08:00
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2007-04-12 03:53:25 +08:00
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struct dev_lookup {
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u64 block_start;
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u64 num_blocks;
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2007-04-13 00:14:00 +08:00
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u64 device_id;
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2007-04-12 03:53:25 +08:00
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struct block_device *bdev;
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};
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2007-04-12 22:43:05 +08:00
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int btrfs_insert_dev_radix(struct btrfs_root *root,
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struct block_device *bdev,
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2007-04-13 00:14:00 +08:00
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u64 device_id,
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2007-04-12 22:43:05 +08:00
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u64 block_start,
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u64 num_blocks)
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{
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struct dev_lookup *lookup;
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int ret;
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lookup = kmalloc(sizeof(*lookup), GFP_NOFS);
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if (!lookup)
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return -ENOMEM;
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lookup->block_start = block_start;
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lookup->num_blocks = num_blocks;
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lookup->bdev = bdev;
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2007-04-13 00:14:00 +08:00
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lookup->device_id = device_id;
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2007-04-12 22:43:05 +08:00
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ret = radix_tree_insert(&root->fs_info->dev_radix, block_start +
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num_blocks - 1, lookup);
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return ret;
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}
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2007-04-12 03:53:25 +08:00
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u64 bh_blocknr(struct buffer_head *bh)
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{
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int blkbits = bh->b_page->mapping->host->i_blkbits;
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u64 blocknr = bh->b_page->index << (PAGE_CACHE_SHIFT - blkbits);
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unsigned long offset;
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if (PageHighMem(bh->b_page))
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offset = (unsigned long)bh->b_data;
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else
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offset = bh->b_data - (char *)page_address(bh->b_page);
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blocknr += offset >> (PAGE_CACHE_SHIFT - blkbits);
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return blocknr;
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}
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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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2007-04-12 03:53:25 +08:00
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if (bh_blocknr(buf) != btrfs_header_blocknr(&node->header)) {
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2007-04-12 22:43:05 +08:00
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printk(KERN_CRIT "bh_blocknr(buf) is %Lu, header is %Lu\n",
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bh_blocknr(buf), 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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2007-02-23 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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2007-04-02 22:50:19 +08:00
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2007-03-29 01:57:48 +08:00
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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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2007-04-12 03:53:25 +08:00
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if (buffer_mapped(bh) && bh_blocknr(bh) == blocknr) {
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2007-03-29 01:57:48 +08:00
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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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2007-03-31 02:27:56 +08:00
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if (ret) {
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2007-03-30 20:47:31 +08:00
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touch_buffer(ret);
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2007-03-31 02:27:56 +08:00
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}
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2007-03-29 01:57:48 +08:00
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page_cache_release(page);
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return ret;
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}
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2007-04-12 22:43:05 +08:00
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int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
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2007-04-12 03:53:25 +08:00
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u64 logical)
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{
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struct dev_lookup *lookup[2];
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int ret;
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2007-04-20 01:37:44 +08:00
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if (logical == 0) {
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bh->b_bdev = NULL;
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bh->b_blocknr = 0;
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set_buffer_mapped(bh);
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return 0;
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}
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2007-04-12 03:53:25 +08:00
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root = root->fs_info->dev_root;
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ret = radix_tree_gang_lookup(&root->fs_info->dev_radix,
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(void **)lookup,
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(unsigned long)logical,
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ARRAY_SIZE(lookup));
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if (ret == 0 || lookup[0]->block_start > logical ||
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lookup[0]->block_start + lookup[0]->num_blocks <= logical) {
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ret = -ENOENT;
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goto out;
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}
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bh->b_bdev = lookup[0]->bdev;
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bh->b_blocknr = logical - lookup[0]->block_start;
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set_buffer_mapped(bh);
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ret = 0;
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out:
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return ret;
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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_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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2007-04-12 03:53:25 +08:00
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int err;
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2007-03-29 01:57:48 +08:00
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u64 first_block = index << (PAGE_CACHE_SHIFT - blockbits);
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2007-03-30 20:47:31 +08:00
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2007-03-29 01:57:48 +08:00
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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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2007-04-12 22:43:05 +08:00
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err = btrfs_map_bh_to_logical(root, bh, first_block);
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2007-04-12 03:53:25 +08:00
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BUG_ON(err);
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2007-03-29 01:57:48 +08:00
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}
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2007-04-12 03:53:25 +08:00
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if (bh_blocknr(bh) == blocknr) {
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2007-03-29 01:57:48 +08:00
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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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2007-03-30 20:47:31 +08:00
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if (ret)
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touch_buffer(ret);
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2007-03-29 01:57:48 +08:00
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page_cache_release(page);
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return ret;
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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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2007-04-12 03:53:25 +08:00
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int err;
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struct btrfs_root *root = BTRFS_I(bh->b_page->mapping->host)->root;
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2007-04-12 22:43:05 +08:00
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err = btrfs_map_bh_to_logical(root, bh, iblock);
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2007-04-12 03:53:25 +08:00
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return err;
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2007-03-29 01:57:48 +08:00
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}
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2007-03-30 03:15:27 +08:00
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int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
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char *result)
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2007-03-29 07:44:27 +08:00
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{
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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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desc.tfm = tfm;
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desc.flags = 0;
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2007-03-30 03:15:27 +08:00
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sg_init_one(&sg, data, len);
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2007-03-29 07:44:27 +08:00
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spin_lock(&root->fs_info->hash_lock);
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2007-03-30 20:47:31 +08:00
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ret = crypto_hash_digest(&desc, &sg, 1, result);
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2007-03-29 07:44:27 +08:00
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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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2007-03-30 03:15:27 +08:00
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return ret;
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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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char result[BTRFS_CSUM_SIZE];
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int ret;
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struct btrfs_node *node;
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ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
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bh->b_size - BTRFS_CSUM_SIZE, result);
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if (ret)
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return ret;
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2007-03-29 07:44:27 +08:00
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if (verify) {
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2007-03-30 03:15:27 +08:00
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if (memcmp(bh->b_data, result, BTRFS_CSUM_SIZE)) {
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2007-04-12 03:53:25 +08:00
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printk("checksum verify failed on %Lu\n",
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bh_blocknr(bh));
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2007-03-30 03:15:27 +08:00
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return 1;
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}
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} else {
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node = btrfs_buffer_node(bh);
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2007-03-30 20:47:31 +08:00
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memcpy(node->header.csum, result, BTRFS_CSUM_SIZE);
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2007-03-30 03:15:27 +08:00
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}
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2007-03-29 07:44:27 +08:00
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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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2007-04-09 22:42:37 +08:00
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struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
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2007-03-29 07:44:27 +08:00
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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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2007-04-03 23:43:19 +08:00
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if (buffer_uptodate(bh))
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goto uptodate;
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2007-03-29 01:57:48 +08:00
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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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2007-04-03 23:43:19 +08:00
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uptodate:
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2007-03-29 01:57:48 +08:00
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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,
|
2007-03-23 00:13:20 +08:00
|
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struct buffer_head *buf)
|
2007-03-02 07:59:40 +08:00
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{
|
2007-03-31 02:27:56 +08:00
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WARN_ON(atomic_read(&buf->b_count) == 0);
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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,
|
2007-03-23 00:13:20 +08:00
|
|
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struct buffer_head *buf)
|
2007-03-02 07:59:40 +08:00
|
|
|
{
|
2007-03-31 02:27:56 +08:00
|
|
|
WARN_ON(atomic_read(&buf->b_count) == 0);
|
2007-03-23 00:13:20 +08:00
|
|
|
clear_buffer_dirty(buf);
|
2007-03-02 07:59:40 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-02 22:50:19 +08:00
|
|
|
static int __setup_root(int blocksize,
|
2007-03-21 02:38:32 +08:00
|
|
|
struct btrfs_root *root,
|
|
|
|
struct btrfs_fs_info *fs_info,
|
2007-03-23 00:13:20 +08:00
|
|
|
u64 objectid)
|
2007-02-21 05:40:44 +08:00
|
|
|
{
|
2007-02-22 06:04:57 +08:00
|
|
|
root->node = NULL;
|
2007-04-09 22:42:37 +08:00
|
|
|
root->inode = NULL;
|
2007-03-07 09:08:01 +08:00
|
|
|
root->commit_root = NULL;
|
2007-04-02 22:50:19 +08:00
|
|
|
root->blocksize = blocksize;
|
2007-03-15 02:14:43 +08:00
|
|
|
root->ref_cows = 0;
|
2007-03-21 02:38:32 +08:00
|
|
|
root->fs_info = fs_info;
|
2007-04-09 22:42:37 +08:00
|
|
|
root->objectid = objectid;
|
|
|
|
root->last_trans = 0;
|
2007-04-11 00:13:09 +08:00
|
|
|
root->highest_inode = 0;
|
|
|
|
root->last_inode_alloc = 0;
|
2007-03-14 04:47:54 +08:00
|
|
|
memset(&root->root_key, 0, sizeof(root->root_key));
|
|
|
|
memset(&root->root_item, 0, sizeof(root->root_item));
|
2007-04-21 08:23:12 +08:00
|
|
|
root->root_key.objectid = objectid;
|
2007-03-14 04:47:54 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-02 22:50:19 +08:00
|
|
|
static int find_and_setup_root(int blocksize,
|
2007-03-21 02:38:32 +08:00
|
|
|
struct btrfs_root *tree_root,
|
|
|
|
struct btrfs_fs_info *fs_info,
|
|
|
|
u64 objectid,
|
2007-03-23 00:13:20 +08:00
|
|
|
struct btrfs_root *root)
|
2007-03-14 04:47:54 +08:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2007-04-02 22:50:19 +08:00
|
|
|
__setup_root(blocksize, root, fs_info, objectid);
|
2007-03-14 04:47:54 +08:00
|
|
|
ret = btrfs_find_last_root(tree_root, objectid,
|
|
|
|
&root->root_item, &root->root_key);
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
|
|
|
root->node = read_tree_block(root,
|
|
|
|
btrfs_root_blocknr(&root->root_item));
|
|
|
|
BUG_ON(!root->node);
|
2007-02-21 05:40:44 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-09 22:42:37 +08:00
|
|
|
struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
|
|
|
|
struct btrfs_key *location)
|
|
|
|
{
|
|
|
|
struct btrfs_root *root;
|
|
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
|
|
struct btrfs_path *path;
|
|
|
|
struct btrfs_leaf *l;
|
2007-04-11 00:13:09 +08:00
|
|
|
u64 highest_inode;
|
2007-04-09 22:42:37 +08:00
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
printk("read_fs_root looking for %Lu %Lu %u\n", location->objectid, location->offset, location->flags);
|
2007-04-11 04:58:11 +08:00
|
|
|
root = radix_tree_lookup(&fs_info->fs_roots_radix,
|
|
|
|
(unsigned long)location->objectid);
|
|
|
|
if (root) {
|
|
|
|
printk("found %p in cache\n", root);
|
|
|
|
return root;
|
|
|
|
}
|
2007-04-09 22:42:37 +08:00
|
|
|
root = kmalloc(sizeof(*root), GFP_NOFS);
|
|
|
|
if (!root) {
|
|
|
|
printk("failed1\n");
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
}
|
|
|
|
if (location->offset == (u64)-1) {
|
|
|
|
ret = find_and_setup_root(fs_info->sb->s_blocksize,
|
|
|
|
fs_info->tree_root, fs_info,
|
|
|
|
location->objectid, root);
|
|
|
|
if (ret) {
|
|
|
|
printk("failed2\n");
|
|
|
|
kfree(root);
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
}
|
|
|
|
goto insert;
|
|
|
|
}
|
|
|
|
|
|
|
|
__setup_root(fs_info->sb->s_blocksize, root, fs_info,
|
|
|
|
location->objectid);
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
|
|
|
ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
|
|
|
|
if (ret != 0) {
|
|
|
|
printk("internal search_slot gives us %d\n", ret);
|
|
|
|
if (ret > 0)
|
|
|
|
ret = -ENOENT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
l = btrfs_buffer_leaf(path->nodes[0]);
|
|
|
|
memcpy(&root->root_item,
|
|
|
|
btrfs_item_ptr(l, path->slots[0], struct btrfs_root_item),
|
|
|
|
sizeof(root->root_item));
|
|
|
|
memcpy(&root->root_key, location, sizeof(*location));
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
|
|
btrfs_release_path(root, path);
|
|
|
|
btrfs_free_path(path);
|
|
|
|
if (ret) {
|
|
|
|
kfree(root);
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
}
|
|
|
|
root->node = read_tree_block(root,
|
|
|
|
btrfs_root_blocknr(&root->root_item));
|
|
|
|
BUG_ON(!root->node);
|
|
|
|
insert:
|
|
|
|
printk("inserting %p\n", root);
|
|
|
|
root->ref_cows = 1;
|
2007-04-11 04:58:11 +08:00
|
|
|
ret = radix_tree_insert(&fs_info->fs_roots_radix,
|
|
|
|
(unsigned long)root->root_key.objectid,
|
2007-04-09 22:42:37 +08:00
|
|
|
root);
|
|
|
|
if (ret) {
|
|
|
|
printk("radix_tree_insert gives us %d\n", ret);
|
|
|
|
brelse(root->node);
|
|
|
|
kfree(root);
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
}
|
2007-04-11 00:13:09 +08:00
|
|
|
ret = btrfs_find_highest_inode(root, &highest_inode);
|
|
|
|
if (ret == 0) {
|
|
|
|
root->highest_inode = highest_inode;
|
|
|
|
root->last_inode_alloc = highest_inode;
|
|
|
|
printk("highest inode is %Lu\n", highest_inode);
|
|
|
|
}
|
2007-04-09 22:42:37 +08:00
|
|
|
printk("all worked\n");
|
|
|
|
return root;
|
|
|
|
}
|
|
|
|
|
2007-04-13 00:14:00 +08:00
|
|
|
static int btrfs_open_disk(struct btrfs_root *root, u64 device_id,
|
|
|
|
u64 block_start, u64 num_blocks,
|
|
|
|
char *filename, int name_len)
|
2007-04-12 22:43:05 +08:00
|
|
|
{
|
|
|
|
char *null_filename;
|
|
|
|
struct block_device *bdev;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
null_filename = kmalloc(name_len + 1, GFP_NOFS);
|
|
|
|
if (!null_filename)
|
|
|
|
return -ENOMEM;
|
|
|
|
memcpy(null_filename, filename, name_len);
|
|
|
|
null_filename[name_len] = '\0';
|
|
|
|
|
|
|
|
bdev = open_bdev_excl(null_filename, O_RDWR, root->fs_info->sb);
|
|
|
|
if (IS_ERR(bdev)) {
|
|
|
|
ret = PTR_ERR(bdev);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
set_blocksize(bdev, root->fs_info->sb->s_blocksize);
|
2007-04-13 00:14:00 +08:00
|
|
|
ret = btrfs_insert_dev_radix(root, bdev, device_id,
|
|
|
|
block_start, num_blocks);
|
2007-04-12 22:43:05 +08:00
|
|
|
BUG_ON(ret);
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
|
|
kfree(null_filename);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int read_device_info(struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
struct btrfs_path *path;
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key key;
|
|
|
|
struct btrfs_leaf *leaf;
|
|
|
|
struct btrfs_device_item *dev_item;
|
|
|
|
int nritems;
|
|
|
|
int slot;
|
|
|
|
|
|
|
|
root = root->fs_info->dev_root;
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
if (!path)
|
|
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
|
|
key.offset = 0;
|
|
|
|
key.flags = 0;
|
|
|
|
btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY);
|
|
|
|
|
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
|
|
leaf = btrfs_buffer_leaf(path->nodes[0]);
|
|
|
|
nritems = btrfs_header_nritems(&leaf->header);
|
|
|
|
while(1) {
|
|
|
|
slot = path->slots[0];
|
|
|
|
if (slot >= nritems) {
|
|
|
|
ret = btrfs_next_leaf(root, path);
|
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
leaf = btrfs_buffer_leaf(path->nodes[0]);
|
|
|
|
nritems = btrfs_header_nritems(&leaf->header);
|
|
|
|
slot = path->slots[0];
|
|
|
|
}
|
|
|
|
btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
|
|
|
|
if (btrfs_key_type(&key) != BTRFS_DEV_ITEM_KEY) {
|
|
|
|
path->slots[0]++;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
dev_item = btrfs_item_ptr(leaf, slot, struct btrfs_device_item);
|
|
|
|
printk("found key %Lu %Lu\n", key.objectid, key.offset);
|
2007-04-13 00:14:00 +08:00
|
|
|
if (btrfs_device_id(dev_item) !=
|
|
|
|
btrfs_super_device_id(root->fs_info->disk_super)) {
|
|
|
|
ret = btrfs_open_disk(root, btrfs_device_id(dev_item),
|
|
|
|
key.objectid, key.offset,
|
|
|
|
(char *)(dev_item + 1),
|
|
|
|
btrfs_device_pathlen(dev_item));
|
|
|
|
BUG_ON(ret);
|
|
|
|
}
|
2007-04-12 22:43:05 +08:00
|
|
|
path->slots[0]++;
|
|
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-02 22:50:19 +08:00
|
|
|
struct btrfs_root *open_ctree(struct super_block *sb)
|
2007-03-21 23:12:56 +08:00
|
|
|
{
|
2007-03-23 00:13:20 +08:00
|
|
|
struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
|
|
|
|
GFP_NOFS);
|
2007-04-12 01:57:44 +08:00
|
|
|
struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
|
|
|
|
GFP_NOFS);
|
2007-03-23 00:13:20 +08:00
|
|
|
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
|
|
|
|
GFP_NOFS);
|
|
|
|
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
|
|
|
|
GFP_NOFS);
|
2007-02-02 22:18:22 +08:00
|
|
|
int ret;
|
2007-04-02 22:50:19 +08:00
|
|
|
struct btrfs_super_block *disk_super;
|
2007-04-12 03:53:25 +08:00
|
|
|
struct dev_lookup *dev_lookup;
|
2007-02-02 22:18:22 +08:00
|
|
|
|
2007-03-26 22:15:30 +08:00
|
|
|
init_bit_radix(&fs_info->pinned_radix);
|
|
|
|
init_bit_radix(&fs_info->pending_del_radix);
|
2007-04-09 22:42:37 +08:00
|
|
|
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
|
2007-04-12 03:53:25 +08:00
|
|
|
INIT_RADIX_TREE(&fs_info->dev_radix, GFP_NOFS);
|
2007-04-20 09:01:03 +08:00
|
|
|
INIT_LIST_HEAD(&fs_info->trans_list);
|
2007-04-02 22:50:19 +08:00
|
|
|
sb_set_blocksize(sb, 4096);
|
2007-03-21 02:38:32 +08:00
|
|
|
fs_info->running_transaction = NULL;
|
|
|
|
fs_info->tree_root = tree_root;
|
|
|
|
fs_info->extent_root = extent_root;
|
2007-04-12 01:57:44 +08:00
|
|
|
fs_info->dev_root = dev_root;
|
2007-03-23 00:13:20 +08:00
|
|
|
fs_info->sb = sb;
|
2007-03-29 01:57:48 +08:00
|
|
|
fs_info->btree_inode = new_inode(sb);
|
|
|
|
fs_info->btree_inode->i_ino = 1;
|
2007-04-02 22:50:19 +08:00
|
|
|
fs_info->btree_inode->i_nlink = 1;
|
2007-03-29 01:57:48 +08:00
|
|
|
fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
|
|
|
|
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
|
2007-04-21 01:16:02 +08:00
|
|
|
fs_info->do_barriers = 1;
|
2007-04-26 03:52:25 +08:00
|
|
|
fs_info->extent_tree_insert_nr = 0;
|
|
|
|
fs_info->extent_tree_prealloc_nr = 0;
|
2007-04-09 22:42:37 +08:00
|
|
|
BTRFS_I(fs_info->btree_inode)->root = tree_root;
|
|
|
|
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
|
|
|
|
sizeof(struct btrfs_key));
|
2007-03-30 20:47:31 +08:00
|
|
|
insert_inode_hash(fs_info->btree_inode);
|
2007-03-29 01:57:48 +08:00
|
|
|
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
|
2007-03-29 07:44:27 +08:00
|
|
|
fs_info->hash_tfm = crypto_alloc_hash("sha256", 0, CRYPTO_ALG_ASYNC);
|
2007-03-29 21:59:15 +08:00
|
|
|
spin_lock_init(&fs_info->hash_lock);
|
|
|
|
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;
|
|
|
|
}
|
2007-03-23 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->last_insert, 0, sizeof(fs_info->last_insert));
|
2007-03-14 04:47:54 +08:00
|
|
|
|
2007-04-12 01:57:44 +08:00
|
|
|
__setup_root(sb->s_blocksize, dev_root,
|
|
|
|
fs_info, BTRFS_DEV_TREE_OBJECTID);
|
|
|
|
|
2007-04-02 22:50:19 +08:00
|
|
|
__setup_root(sb->s_blocksize, tree_root,
|
|
|
|
fs_info, BTRFS_ROOT_TREE_OBJECTID);
|
2007-04-12 03:53:25 +08:00
|
|
|
|
|
|
|
dev_lookup = kmalloc(sizeof(*dev_lookup), GFP_NOFS);
|
|
|
|
dev_lookup->block_start = 0;
|
|
|
|
dev_lookup->num_blocks = (u32)-2;
|
|
|
|
dev_lookup->bdev = sb->s_bdev;
|
2007-04-13 00:14:00 +08:00
|
|
|
dev_lookup->device_id = 0;
|
2007-04-12 03:53:25 +08:00
|
|
|
ret = radix_tree_insert(&fs_info->dev_radix, (u32)-2, dev_lookup);
|
|
|
|
BUG_ON(ret);
|
2007-04-02 22:50:19 +08:00
|
|
|
fs_info->sb_buffer = read_tree_block(tree_root,
|
|
|
|
BTRFS_SUPER_INFO_OFFSET /
|
|
|
|
sb->s_blocksize);
|
2007-03-29 01:57:48 +08:00
|
|
|
|
2007-04-09 22:42:37 +08:00
|
|
|
if (!fs_info->sb_buffer)
|
2007-03-29 01:57:48 +08:00
|
|
|
return NULL;
|
|
|
|
disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
|
2007-04-09 22:42:37 +08:00
|
|
|
if (!btrfs_super_root(disk_super))
|
2007-04-02 22:50:19 +08:00
|
|
|
return NULL;
|
2007-04-09 22:42:37 +08:00
|
|
|
|
2007-04-12 22:43:05 +08:00
|
|
|
i_size_write(fs_info->btree_inode,
|
|
|
|
btrfs_super_total_blocks(disk_super) <<
|
|
|
|
fs_info->btree_inode->i_blkbits);
|
|
|
|
|
2007-04-12 03:53:25 +08:00
|
|
|
radix_tree_delete(&fs_info->dev_radix, (u32)-2);
|
|
|
|
dev_lookup->block_start = btrfs_super_device_block_start(disk_super);
|
|
|
|
dev_lookup->num_blocks = btrfs_super_device_num_blocks(disk_super);
|
2007-04-13 00:14:00 +08:00
|
|
|
dev_lookup->device_id = btrfs_super_device_id(disk_super);
|
|
|
|
|
2007-04-12 03:53:25 +08:00
|
|
|
ret = radix_tree_insert(&fs_info->dev_radix,
|
|
|
|
dev_lookup->block_start +
|
2007-04-12 22:43:05 +08:00
|
|
|
dev_lookup->num_blocks - 1, dev_lookup);
|
2007-04-12 03:53:25 +08:00
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-03-29 01:57:48 +08:00
|
|
|
fs_info->disk_super = disk_super;
|
2007-04-12 22:43:05 +08:00
|
|
|
|
2007-04-12 01:57:44 +08:00
|
|
|
dev_root->node = read_tree_block(tree_root,
|
|
|
|
btrfs_super_device_root(disk_super));
|
2007-04-12 22:43:05 +08:00
|
|
|
|
|
|
|
ret = read_device_info(dev_root);
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
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);
|
|
|
|
|
2007-04-02 22:50:19 +08:00
|
|
|
mutex_lock(&fs_info->fs_mutex);
|
|
|
|
ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
|
2007-03-23 00:13:20 +08:00
|
|
|
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
|
2007-03-14 04:47:54 +08:00
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-04-09 22:42:37 +08:00
|
|
|
fs_info->generation = btrfs_super_generation(disk_super) + 1;
|
2007-04-07 03:37:36 +08:00
|
|
|
memset(&fs_info->kobj, 0, sizeof(fs_info->kobj));
|
|
|
|
kobj_set_kset_s(fs_info, btrfs_subsys);
|
|
|
|
kobject_set_name(&fs_info->kobj, "%s", sb->s_id);
|
|
|
|
kobject_register(&fs_info->kobj);
|
2007-04-06 01:35:25 +08:00
|
|
|
mutex_unlock(&fs_info->fs_mutex);
|
2007-04-09 22:42:37 +08:00
|
|
|
return tree_root;
|
2007-02-02 22:18:22 +08:00
|
|
|
}
|
|
|
|
|
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
|
|
|
{
|
2007-04-21 01:16:02 +08:00
|
|
|
int ret;
|
2007-03-23 22:01:08 +08:00
|
|
|
struct buffer_head *bh = root->fs_info->sb_buffer;
|
2007-04-02 22:50:19 +08:00
|
|
|
|
2007-03-23 22:01:08 +08:00
|
|
|
btrfs_set_super_root(root->fs_info->disk_super,
|
2007-04-12 03:53:25 +08:00
|
|
|
bh_blocknr(root->fs_info->tree_root->node));
|
2007-03-23 22:01:08 +08:00
|
|
|
lock_buffer(bh);
|
2007-04-02 22:50:19 +08:00
|
|
|
WARN_ON(atomic_read(&bh->b_count) < 1);
|
2007-03-23 22:01:08 +08:00
|
|
|
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);
|
2007-04-21 01:16:02 +08:00
|
|
|
if (root->fs_info->do_barriers)
|
|
|
|
ret = submit_bh(WRITE_BARRIER, bh);
|
|
|
|
else
|
|
|
|
ret = submit_bh(WRITE, bh);
|
|
|
|
if (ret == -EOPNOTSUPP) {
|
|
|
|
set_buffer_uptodate(bh);
|
|
|
|
root->fs_info->do_barriers = 0;
|
|
|
|
ret = submit_bh(WRITE, bh);
|
|
|
|
}
|
2007-03-23 22:01:08 +08:00
|
|
|
wait_on_buffer(bh);
|
|
|
|
if (!buffer_uptodate(bh)) {
|
|
|
|
WARN_ON(1);
|
|
|
|
return -EIO;
|
2007-02-22 06:04:57 +08:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-11 04:58:11 +08:00
|
|
|
static int free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
radix_tree_delete(&fs_info->fs_roots_radix,
|
|
|
|
(unsigned long)root->root_key.objectid);
|
|
|
|
if (root->inode)
|
|
|
|
iput(root->inode);
|
|
|
|
if (root->node)
|
|
|
|
brelse(root->node);
|
|
|
|
if (root->commit_root)
|
|
|
|
brelse(root->commit_root);
|
|
|
|
kfree(root);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-09 22:42:37 +08:00
|
|
|
int del_fs_roots(struct btrfs_fs_info *fs_info)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_root *gang[8];
|
|
|
|
int i;
|
|
|
|
|
|
|
|
while(1) {
|
|
|
|
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
|
|
(void **)gang, 0,
|
|
|
|
ARRAY_SIZE(gang));
|
|
|
|
if (!ret)
|
|
|
|
break;
|
2007-04-11 04:58:11 +08:00
|
|
|
for (i = 0; i < ret; i++)
|
|
|
|
free_fs_root(fs_info, gang[i]);
|
2007-04-09 22:42:37 +08:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2007-04-13 00:14:00 +08:00
|
|
|
|
2007-04-12 03:53:25 +08:00
|
|
|
static int free_dev_radix(struct btrfs_fs_info *fs_info)
|
|
|
|
{
|
|
|
|
struct dev_lookup *lookup[8];
|
|
|
|
struct block_device *super_bdev = fs_info->sb->s_bdev;
|
|
|
|
int ret;
|
|
|
|
int i;
|
|
|
|
while(1) {
|
|
|
|
ret = radix_tree_gang_lookup(&fs_info->dev_radix,
|
|
|
|
(void **)lookup, 0,
|
|
|
|
ARRAY_SIZE(lookup));
|
|
|
|
if (!ret)
|
|
|
|
break;
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
|
|
if (lookup[i]->bdev != super_bdev)
|
|
|
|
close_bdev_excl(lookup[i]->bdev);
|
|
|
|
radix_tree_delete(&fs_info->dev_radix,
|
|
|
|
lookup[i]->block_start +
|
2007-04-12 22:43:05 +08:00
|
|
|
lookup[i]->num_blocks - 1);
|
2007-04-12 03:53:25 +08:00
|
|
|
kfree(lookup[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2007-04-09 22:42:37 +08:00
|
|
|
|
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;
|
2007-04-09 22:42:37 +08:00
|
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
2007-03-17 04:20:31 +08:00
|
|
|
|
2007-04-09 22:42:37 +08:00
|
|
|
mutex_lock(&fs_info->fs_mutex);
|
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);
|
2007-04-09 22:42:37 +08:00
|
|
|
mutex_unlock(&fs_info->fs_mutex);
|
|
|
|
|
|
|
|
if (fs_info->extent_root->node)
|
|
|
|
btrfs_block_release(fs_info->extent_root,
|
|
|
|
fs_info->extent_root->node);
|
2007-04-12 01:57:44 +08:00
|
|
|
if (fs_info->dev_root->node)
|
|
|
|
btrfs_block_release(fs_info->dev_root,
|
|
|
|
fs_info->dev_root->node);
|
2007-04-09 22:42:37 +08:00
|
|
|
if (fs_info->tree_root->node)
|
|
|
|
btrfs_block_release(fs_info->tree_root,
|
|
|
|
fs_info->tree_root->node);
|
|
|
|
btrfs_block_release(root, fs_info->sb_buffer);
|
|
|
|
crypto_free_hash(fs_info->hash_tfm);
|
|
|
|
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
|
|
|
|
iput(fs_info->btree_inode);
|
2007-04-12 03:53:25 +08:00
|
|
|
|
|
|
|
free_dev_radix(fs_info);
|
2007-04-09 22:42:37 +08:00
|
|
|
del_fs_roots(fs_info);
|
|
|
|
kfree(fs_info->extent_root);
|
|
|
|
kfree(fs_info->tree_root);
|
|
|
|
kobject_unregister(&fs_info->kobj);
|
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
|
|
|
{
|
2007-04-03 02:53:59 +08:00
|
|
|
brelse(buf);
|
2007-02-02 22:18:22 +08:00
|
|
|
}
|
|
|
|
|