Hi, everyone: Could anybody give some tips about how `mdr->slave_commit` is called? As for `link_remote()`, steps are as follows: 1. master mds sends OP_(UN)LINKPREP to salve mds. 2. slave mds replys OP_LINKPREPACK to master mds after its journal has been flushed. 3. master mds continues to process the client request. I only find out there is a chance in MDCache::request_finish() that `mdr->slave_commit` will be called. However, after a successful journal flush, slave mds only sends an ACK to master mds and bypasses MDCache::request_finish(). So when or where is `mdr->slave_commit` called? Thanks!
