Commit 8c579fe7 authored by Josef Bacik's avatar Josef Bacik
Browse files

Btrfs: fix error handling in make/read block group 



I noticed that we will add a block group to the space info before we add it to
the block group cache rb tree, so we could potentially allocate from the block
group before it's able to be searched for.  I don't think this is too much of
a problem, the race window is microscopic, but just in case move the tree
insertion to above the space info linking.  This makes it easier to adjust the
error handling as well, so we can remove a couple of BUG_ON(ret)'s and have real
error handling setup for these scenarios.  Thanks,

Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
parent 5c2d867f

fs/btrfs/extent-tree.c

+33 −8
Original line number Diff line number Diff line
@@ -8175,10 +8175,26 @@ int btrfs_read_block_groups(struct btrfs_root *root) 
			free_excluded_extents(root, cache);

		}



		ret = btrfs_add_block_group_cache(root->fs_info, cache);

		if (ret) {

			btrfs_remove_free_space_cache(cache);

			btrfs_put_block_group(cache);

			goto error;

		}



		ret = update_space_info(info, cache->flags, found_key.offset,

					btrfs_block_group_used(&cache->item),

					&space_info);

		BUG_ON(ret); /* -ENOMEM */

		if (ret) {

			btrfs_remove_free_space_cache(cache);

			spin_lock(&info->block_group_cache_lock);

			rb_erase(&cache->cache_node,

				 &info->block_group_cache_tree);

			spin_unlock(&info->block_group_cache_lock);

			btrfs_put_block_group(cache);

			goto error;

		}



		cache->space_info = space_info;

		spin_lock(&cache->space_info->lock);

		cache->space_info->bytes_readonly += cache->bytes_super;
@@ -8186,9 +8202,6 @@ int btrfs_read_block_groups(struct btrfs_root *root) 


		__link_block_group(space_info, cache);



		ret = btrfs_add_block_group_cache(root->fs_info, cache);

		BUG_ON(ret); /* Logic error */



		set_avail_alloc_bits(root->fs_info, cache->flags);

		if (btrfs_chunk_readonly(root, cache->key.objectid))

			set_block_group_ro(cache, 1);
@@ -8311,9 +8324,24 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, 


	free_excluded_extents(root, cache);



	ret = btrfs_add_block_group_cache(root->fs_info, cache);

	if (ret) {

		btrfs_remove_free_space_cache(cache);

		btrfs_put_block_group(cache);

		return ret;

	}



	ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,

				&cache->space_info);

	BUG_ON(ret); /* -ENOMEM */

	if (ret) {

		btrfs_remove_free_space_cache(cache);

		spin_lock(&root->fs_info->block_group_cache_lock);

		rb_erase(&cache->cache_node,

			 &root->fs_info->block_group_cache_tree);

		spin_unlock(&root->fs_info->block_group_cache_lock);

		btrfs_put_block_group(cache);

		return ret;

	}

	update_global_block_rsv(root->fs_info);



	spin_lock(&cache->space_info->lock);
@@ -8322,9 +8350,6 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, 


	__link_block_group(cache->space_info, cache);



	ret = btrfs_add_block_group_cache(root->fs_info, cache);

	BUG_ON(ret); /* Logic error */



	list_add_tail(&cache->new_bg_list, &trans->new_bgs);



	set_avail_alloc_bits(extent_root->fs_info, type);

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