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It should handle the case that a directory was restriped and the LMV layout was changed. In this case, the files under the directory will be migrated to another MDT. To simplify the impelmentation, we do not migrate the files according to the new LMV layout in the Trash Can. This may result in the lookup() operation will be issued to a wrong MDT and return -ENOENT wrongly (after files in the trash can are restored). However, the readdir() operations will still return all the dir entries in the striped trash even the parent LMV layout was restriped re-striped and changed.