[PATCH] knfsd: allow the server to provide a gid list when using AUTH_UNIX authentication

AUTH_UNIX authentication (the standard with NFS) has a limit of 16 groups ids.
 This causes problems for people in more than 16 groups.

So allow the server to map a uid into a list of group ids based on local
knowledge rather depending on the (possibly truncated) list from the client.

If there is no process on the server responding to upcalls, the gidlist in the
request will still be used.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index d85fddeb6388..d3865265fc18 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -137,7 +137,7 @@ EXPORT_SYMBOL(nlm_debug);
 
 extern int register_rpc_pipefs(void);
 extern void unregister_rpc_pipefs(void);
-extern struct cache_detail ip_map_cache;
+extern struct cache_detail ip_map_cache, unix_gid_cache;
 extern int init_socket_xprt(void);
 extern void cleanup_socket_xprt(void);
 
@@ -157,6 +157,7 @@ init_sunrpc(void)
         rpc_proc_init();
 #endif
         cache_register(&ip_map_cache);
+        cache_register(&unix_gid_cache);
         init_socket_xprt();
 out:
         return err;
@@ -170,6 +171,8 @@ cleanup_sunrpc(void)
         rpc_destroy_mempool();
         if (cache_unregister(&ip_map_cache))
                 printk(KERN_ERR "sunrpc: failed to unregister ip_map cache\n");
+        if (cache_unregister(&unix_gid_cache))
+              printk(KERN_ERR "sunrpc: failed to unregister unix_gid cache\n");
 #ifdef RPC_DEBUG
         rpc_unregister_sysctl();
 #endif