resize.c

来自「ocfs1.4.1 oracle分布式文件系统」· C语言 代码 · 共 635 行 · 第 1/2 页

		mlog(ML_ERROR, "The disk is too old and small. "
		     "Force to do offline resize.");
		ret = -EINVAL;
		goto out_unlock;
	}

	if (!OCFS2_IS_VALID_DINODE(fe)) {
		OCFS2_RO_ON_INVALID_DINODE(main_bm_inode->i_sb, fe);
		ret = -EIO;
		goto out_unlock;
	}

	first_new_cluster = le32_to_cpu(fe->i_clusters);
	lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
					      first_new_cluster - 1);

	ret = ocfs2_read_block(osb, lgd_blkno, &group_bh, OCFS2_BH_CACHED,
			       main_bm_inode);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_unlock;
	}

	group = (struct ocfs2_group_desc *)group_bh->b_data;

	ret = ocfs2_check_group_descriptor(inode->i_sb, fe, group);
	if (ret) {
		mlog_errno(ret);
		goto out_unlock;
	}

	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
		le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
		ret = -EINVAL;
		goto out_unlock;
	}

	mlog(0, "extend the last group at %llu, new clusters = %d\n",
	     (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);

	handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
	if (IS_ERR(handle)) {
		mlog_errno(PTR_ERR(handle));
		ret = -EINVAL;
		goto out_unlock;
	}

	/* update the last group descriptor and inode. */
	ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
						main_bm_bh, group_bh,
						first_new_cluster,
						new_clusters);
	if (ret) {
		mlog_errno(ret);
		goto out_commit;
	}

	ocfs2_update_super_and_backups(main_bm_inode, new_clusters);

out_commit:
	ocfs2_commit_trans(osb, handle);
out_unlock:
	brelse(group_bh);
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

out_mutex:
	mutex_unlock(&main_bm_inode->i_mutex);
	iput(main_bm_inode);

out:
	mlog_exit_void();
	return ret;
}

static int ocfs2_check_new_group(struct inode *inode,
				 struct ocfs2_dinode *di,
				 struct ocfs2_new_group_input *input,
				 struct buffer_head *group_bh)
{
	int ret;
	struct ocfs2_group_desc *gd;
	u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
	unsigned int max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) *
				le16_to_cpu(di->id2.i_chain.cl_bpc);


	gd = (struct ocfs2_group_desc *)group_bh->b_data;

	ret = -EIO;
	if (!OCFS2_IS_VALID_GROUP_DESC(gd))
		mlog(ML_ERROR, "Group descriptor # %llu isn't valid.\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno));
	else if (di->i_blkno != gd->bg_parent_dinode)
		mlog(ML_ERROR, "Group descriptor # %llu has bad parent "
		     "pointer (%llu, expected %llu)\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
		     (unsigned long long)le64_to_cpu(di->i_blkno));
	else if (le16_to_cpu(gd->bg_bits) > max_bits)
		mlog(ML_ERROR, "Group descriptor # %llu has bit count of %u\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits));
	else if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits))
		mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
		     "claims that %u are free\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits),
		     le16_to_cpu(gd->bg_free_bits_count));
	else if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size)))
		mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
		     "max bitmap bits of %u\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits),
		     8 * le16_to_cpu(gd->bg_size));
	else if (le16_to_cpu(gd->bg_chain) != input->chain)
		mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
		     "while input has %u set.\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_chain), input->chain);
	else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
		mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
		     "input has %u clusters set\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits), input->clusters);
	else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
		mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
		     "but it should have %u set\n",
		     (unsigned long long)le64_to_cpu(gd->bg_blkno),
		     le16_to_cpu(gd->bg_bits),
		     input->frees * cl_bpc);
	else
		ret = 0;

	return ret;
}

static int ocfs2_verify_group_and_input(struct inode *inode,
					struct ocfs2_dinode *di,
					struct ocfs2_new_group_input *input,
					struct buffer_head *group_bh)
{
	u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
	u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
	u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
	u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
	u32 total_clusters = le32_to_cpu(di->i_clusters);
	int ret = -EINVAL;

	if (cluster < total_clusters)
		mlog(ML_ERROR, "add a group which is in the current volume.\n");
	else if (input->chain >= cl_count)
		mlog(ML_ERROR, "input chain exceeds the limit.\n");
	else if (next_free != cl_count && next_free != input->chain)
		mlog(ML_ERROR,
		     "the add group should be in chain %u\n", next_free);
	else if (total_clusters + input->clusters < total_clusters)
		mlog(ML_ERROR, "add group's clusters overflow.\n");
	else if (input->clusters > cl_cpg)
		mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
	else if (input->frees > input->clusters)
		mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
	else if (total_clusters % cl_cpg != 0)
		mlog(ML_ERROR,
		     "the last group isn't full. Use group extend first.\n");
	else if (input->group != ocfs2_which_cluster_group(inode, cluster))
		mlog(ML_ERROR, "group blkno is invalid\n");
	else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
		mlog(ML_ERROR, "group descriptor check failed.\n");
	else
		ret = 0;

	return ret;
}

/* Add a new group descriptor to global_bitmap. */
int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
{
	int ret;
	handle_t *handle;
	struct buffer_head *main_bm_bh = NULL;
	struct inode *main_bm_inode = NULL;
	struct ocfs2_dinode *fe = NULL;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *group_bh = NULL;
	struct ocfs2_group_desc *group = NULL;
	struct ocfs2_chain_list *cl;
	struct ocfs2_chain_rec *cr;
	u16 cl_bpc;

	mlog_entry_void();

	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
		return -EROFS;

	main_bm_inode = ocfs2_get_system_file_inode(osb,
						    GLOBAL_BITMAP_SYSTEM_INODE,
						    OCFS2_INVALID_SLOT);
	if (!main_bm_inode) {
		ret = -EINVAL;
		mlog_errno(ret);
		goto out;
	}

	mutex_lock(&main_bm_inode->i_mutex);

	ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_mutex;
	}

	fe = (struct ocfs2_dinode *)main_bm_bh->b_data;

	if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
				 ocfs2_group_bitmap_size(osb->sb) * 8) {
		mlog(ML_ERROR, "The disk is too old and small."
		     " Force to do offline resize.");
		ret = -EINVAL;
		goto out_unlock;
	}

	ret = ocfs2_read_block(osb, input->group, &group_bh, 0, NULL);
	if (ret < 0) {
		mlog(ML_ERROR, "Can't read the group descriptor # %llu "
		     "from the device.", (unsigned long long)input->group);
		goto out_unlock;
	}

	ocfs2_set_new_buffer_uptodate(inode, group_bh);

	ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
	if (ret) {
		mlog_errno(ret);
		goto out_unlock;
	}

	mlog(0, "Add a new group  %llu in chain = %u, length = %u\n",
	     (unsigned long long)input->group, input->chain, input->clusters);

	handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
	if (IS_ERR(handle)) {
		mlog_errno(PTR_ERR(handle));
		ret = -EINVAL;
		goto out_unlock;
	}

	cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
	cl = &fe->id2.i_chain;
	cr = &cl->cl_recs[input->chain];

	ret = ocfs2_journal_access(handle, main_bm_inode, group_bh,
				   OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_commit;
	}

	group = (struct ocfs2_group_desc *)group_bh->b_data;
	group->bg_next_group = cr->c_blkno;

	ret = ocfs2_journal_dirty(handle, group_bh);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_commit;
	}

	ret = ocfs2_journal_access(handle, main_bm_inode, main_bm_bh,
				   OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret < 0) {
		mlog_errno(ret);
		goto out_commit;
	}

	if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
		le16_add_cpu(&cl->cl_next_free_rec, 1);
		memset(cr, 0, sizeof(struct ocfs2_chain_rec));
	}

	cr->c_blkno = cpu_to_le64(input->group);
	le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
	le32_add_cpu(&cr->c_free, input->frees * cl_bpc);

	le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
	le32_add_cpu(&fe->id1.bitmap1.i_used,
		     (input->clusters - input->frees) * cl_bpc);
	le32_add_cpu(&fe->i_clusters, input->clusters);

	ocfs2_journal_dirty(handle, main_bm_bh);

	spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
	OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
	le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
	spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
	i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));

	ocfs2_update_super_and_backups(main_bm_inode, input->clusters);

out_commit:
	ocfs2_commit_trans(osb, handle);
out_unlock:
	brelse(group_bh);
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

out_mutex:
	mutex_unlock(&main_bm_inode->i_mutex);
	iput(main_bm_inode);

out:
	mlog_exit_void();
	return ret;
}