afs: Support interacting with multiple user namespaces

Modify struct afs_file_status to store owner as a kuid_t and group as
a kgid_t.

In xdr_decode_AFSFetchStatus as owner is now a kuid_t and group is now
a kgid_t don't use the EXTRACT macro.  Instead perform the work of
the extract macro explicitly.  Read the value with ntohl and
convert it to the appropriate type with make_kuid or make_kgid.
Test if the value is different from what is stored in status and
update changed.   Update the value in status.

In xdr_encode_AFS_StoreStatus call from_kuid or from_kgid as
we are computing the on the wire encoding.

Initialize uids with GLOBAL_ROOT_UID instead of 0.
Initialize gids with GLOBAL_ROOT_GID instead of 0.

Cc: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 394d24f99efe..4570b02abcc5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1071,7 +1071,6 @@ config UIDGID_CONVERTED
         default y
 
         # Filesystems
-        depends on AFS_FS = n
         depends on CIFS = n
         depends on CODA_FS = n
         depends on GFS2_FS = n