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NFSD: Add a Kconfig setting to enable support for NFSv4 POSIX ACLs

A new IETF draft extends NFSv4.2 with POSIX ACL attributes:

https://www.ietf.org/archive/id/draft-ietf-nfsv4-posix-acls-00.txt

This draft has not yet been ratified. A build-time configuration
option allows developers and distributors to decide whether to
expose this experimental protocol extension to NFSv4 clients. The
option is disabled by default to prevent unintended deployment of
potentially unstable protocol features in production environments.

This approach mirrors the existing NFSD_V4_DELEG_TIMESTAMPS option,
which gates another experimental NFSv4 extension based on an
unratified IETF draft.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Chuck Lever feb8a46b 6bc85bab

+19
+19
fs/nfsd/Kconfig
··· 186 186 draft-ietf-nfsv4-delstid-08 "Extending the Opening of Files". This 187 187 is currently an experimental feature and is therefore left disabled 188 188 by default. 189 + 190 + config NFSD_V4_POSIX_ACLS 191 + bool "Support NFSv4 POSIX draft ACLs" 192 + depends on NFSD_V4 193 + default n 194 + help 195 + Include experimental support for POSIX Access Control Lists 196 + (ACLs) in NFSv4 as specified in the IETF draft 197 + draft-ietf-nfsv4-posix-acls. This protocol extension enables 198 + NFSv4 clients to retrieve and modify POSIX ACLs on exported 199 + filesystems that support them. 200 + 201 + This feature is based on an unratified IETF draft 202 + specification that may change in ways that impact 203 + interoperability with existing clients. Enable only for 204 + testing environments or when interoperability with specific 205 + clients that implement this draft is required. 206 + 207 + If unsure, say N.