+int btrfs_wait_cache_io(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_block_group_cache *block_group,
+ struct btrfs_io_ctl *io_ctl,
+ struct btrfs_path *path, u64 offset)
+{
+ int ret;
+ struct inode *inode = io_ctl->inode;
+
+ root = root->fs_info->tree_root;
+
+ /* Flush the dirty pages in the cache file. */
+ ret = flush_dirty_cache(inode);
+ if (ret)
+ goto out;
+
+ /* Update the cache item to tell everyone this cache file is valid. */
+ ret = update_cache_item(trans, root, inode, path, offset,
+ io_ctl->entries, io_ctl->bitmaps);
+out:
+ io_ctl_free(io_ctl);
+ if (ret) {
+ invalidate_inode_pages2(inode->i_mapping);
+ BTRFS_I(inode)->generation = 0;
+ if (block_group) {
+#ifdef DEBUG
+ btrfs_err(root->fs_info,
+ "failed to write free space cache for block group %llu",
+ block_group->key.objectid);
+#endif
+ }
+ }
+ btrfs_update_inode(trans, root, inode);
+
+ if (block_group) {
+ spin_lock(&block_group->lock);
+
+ /*
+ * only mark this as written if we didn't get put back on
+ * the dirty list while waiting for IO.
+ */
+ if (!ret && list_empty(&block_group->dirty_list))
+ block_group->disk_cache_state = BTRFS_DC_WRITTEN;
+ else if (ret)
+ block_group->disk_cache_state = BTRFS_DC_ERROR;
+
+ spin_unlock(&block_group->lock);
+ io_ctl->inode = NULL;
+ iput(inode);
+ }
+
+ return ret;
+
+}
+