From: Wonhyuk Yang <vvghjk1234@xxxxxxxxx> Thank you for your reply. > By the way, this isn't right. You meant 'if (xa_is_value(page))'. I think you missed a ! operator. Actually I was not sure that there are other internal entries except retry entry and zero entry in the xas_for_each(). > The reason we can see a retry entry here is that we did a readahead of a > single page at index 0. Between that page being inserted and the lookup, > another page was removed from the file (maybe the file was truncated > down) and this caused the node to be removed, and the pointer to the > page got moved into the root of the tree. The pointer in the node was > replaced with a retry entry, indicating that the page is still valid, > it just isn't here any more. And so we retry the lookup. It's a little difficult for me, but thank you for your specific explanation.
