On Wed, Aug 28, 2019 at 08:25:16PM +0000, Trond Myklebust wrote: > Umm... Don't forget that NFSv4 ACL aces are typically much larger than > POSIX ACL aces because the user/group names are encoded as strings, not > binary uids and gids. > > IOW: The size of the RPC message is likely to be a lot larger than the > resulting POSIX ACL... Actually this limit is post-idmapping, but, yes, before NFSv4->Posix mapping (complicated in itself), which is why I talked about having to estimate. More interested to hear what you think about whether we need a limit at all. Do we have any ideas how big is too big a number to pass to kmalloc? Or is it OK to just let anything through and let kmalloc fail? --b.
