Summary:
The SETATTR RPC allows for changing various attributes of the file, like it's
mode, uid, gid, etc. The one piece of the NFS RFC that isn't implemented is
that NFS allows for a client to pass a ctime to the server that it needs to
check prior to setting the attributes. This is done to avoid concurrent
operations on the file conflicting with each other. This is not implemented for
now as Mercurial appears to not be using it.
Reviewed By: kmancini
Differential Revision: D26760073
fbshipit-source-id: 3474665fcf1b089ef6f7de4a6c45a26ef324240e
30bbc06336