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-rw-r--r--extent-tree.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/extent-tree.c b/extent-tree.c
index 06ecbe3c..868d4b95 100644
--- a/extent-tree.c
+++ b/extent-tree.c
@@ -461,6 +461,8 @@ struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
dirty_tree_block(trans, root, buf);
btrfs_set_header_generation(&buf->node.header,
root->root_key.offset + 1);
+ memcpy(buf->node.header.fsid, root->fs_info->disk_super->fsid,
+ sizeof(buf->node.header.fsid));
return buf;
}