rpc: implement server.manage-gids for group resolving on the bricks

The new volume option 'server.manage-gids' can be enabled in
environments where a user belongs to more than the current absolute
maximum of 93 groups. This option triggers the following behavior:

1. The AUTH_GLUSTERFS structure sent by GlusterFS clients (fuse, nfs or
   libgfapi) will contain only one (1) auxiliary group, instead of
   a full list. This reduces network usage and prevents problems in
   encoding the AUTH_GLUSTERFS structure which should fit in 400 bytes.
2. The single group in the RPC Calls received by the server is replaced
   by resolving the groups server-side. Permission checks and similar in
   lower xlators are applied against the full list of groups where the
   user belongs to, and not the single auxiliary group that the client
   sent.

Cherry picked from commit 2fd499d148fc8865c77de8b2c73fe0b7e1737882:
> BUG: 1053579
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-on: http://review.gluster.org/7501
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: Santosh Pradhan <spradhan@redhat.com>
> Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
> Reviewed-by: Anand Avati <avati@redhat.com>

Change-Id: I9e540de13e3022f8b63ff893ecba511129a47b91
BUG: 1096425
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/7830
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Santosh Pradhan <spradhan@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/xlators/protocol/server/src/server.h b/xlators/protocol/server/src/server.h
index 43e84921c8a..6e54ecf6d1a 100644
--- a/xlators/protocol/server/src/server.h
+++ b/xlators/protocol/server/src/server.h
@@ -22,6 +22,7 @@
 #include "glusterfs3.h"
 #include "timer.h"
 #include "client_t.h"
+#include "gidcache.h"
 
 #define DEFAULT_BLOCK_SIZE         4194304   /* 4MB */
 #define DEFAULT_VOLUME_FILE_PATH   CONFDIR "/glusterfs.vol"
@@ -57,6 +58,10 @@ struct server_conf {
         dict_t                 *auth_modules;
         pthread_mutex_t         mutex;
         struct list_head        xprt_list;
+
+        gf_boolean_t            server_manage_gids; /* resolve gids on brick */
+        gid_cache_t             gid_cache;
+        int32_t                 gid_cache_timeout;
 };
 typedef struct server_conf server_conf_t;