can mds prepare inodes?

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hi developers,
   I have a question about the prealloc_inos variable in SessionMap.h
   when the client first request to allocate an inode,
prepare_new_inode function will prepare new inodes to the session. so
if  the client's first request is to make a dir, the MDS always
return  a  safe message to the client, but why it  do not answer
unsafe to th client?
  i want to  prepare new inodes to the session in
handle_client_stat,can i do that? in other words, should i allocate
inodes when client mounted on the ceph cluster?
thanks!
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