Re: [PATCH] nfsd: Add support for mapping sticky bit into NFS4 ACL

[Cedric Blancher]

On Sat, 5 Oct 2024 at 17:08, Pali Rohár <pali@xxxxxxxxxx> wrote:
>
> Hello Chuck, have you done more research on this as mentioned?
>
> I think that this is really useful for non-POSIX clients as NFS4 ACLs
> are not-POSIX; knfsd is already translating POSIX ACLs to non-POSIX
> NFS4 ACLs, and this is just an improvement to covert also the
> POSIX-sticky-bit in non-POSIX NFS4 ACL.
>
> Also another improvement is that this change allows to modify all parts
> of POSIX access mode (sticky bit, base mode permissions r/w/x and POSIX
> ACL) via NFS4 ACL structure. So non-POSIX NFS4 client would be able to
> add or remove directory sticky bit via NFS4 ACL editor.
>
> Of course, nothing from this is required by RFC8881 specification, but
> specification also does not disallow this for NFS4 servers. It is
> improvement for non-POSIX clients. POSIX clients would of course not use
> it.

Have you tested this change against the Windows ms-nfs41-client
(https://cygwin.com/pipermail/cygwin/2024-September/256473.html) and
OpenText NFSv4 clients? They do use NFSv4 ACLs extensively, and might
break if you abuse NFSv4 ACLs

Ced

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Cedric Blancher <cedric.blancher@xxxxxxxxx>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur