On Fri, 2020-07-24 at 11:19 +0100, David Howells wrote: > David Howells <dhowells@xxxxxxxxxx> wrote: > > > > What guarantees that mount_id is going to remain a 32bit entity? > > > > You think it likely we'd have >4 billion concurrent mounts on a > > system? That > > would require >1.2TiB of RAM just for the struct mount allocations. > > > > But I can expand it to __u64. > > That said, sys_name_to_handle_at() assumes it's a 32-bit signed > integer, so > we're currently limited to ~2 billion concurrent mounts:-/ I was wondering about id re-use. Assuming that ids that are returned to the idr db are re-used what would the chance that a recently used id would end up being used? Would that chance increase as ids are consumed and freed over time? Yeah, it's one of those questions ... ;) Ian
