Add kernel support to the NFS server for the "-manage-gids"

option that will be added to the nfsuserd daemon in a future
commit. It modifies the cache used by NFSv4 for name<-->id
translation (both username/uid and group/gid) to support this.
When "-manage-gids" is set, the server looks up each uid
for the RPC and uses the list of groups cached in the server
instead of the list of groups provided in the RPC request.
The cached group list is acquired for the cache by the nfsuserd
daemon via getgrouplist(3).
This avoids the 16 groups limit for the list in the RPC request.
Since the cache is now used for every RPC when "-manage-gids"
is enabled, the code also modifies the cache to use a separate
mutex for each hash list instead of a single global mutex.

Suggested by:	jpaetzel
Tested by:	jpaetzel
MFC after:	2 weeks

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/nfs/nfssvc.h b/sys/nfs/nfssvc.h
index 65b1681b58e6..a194ed51aea8 100644
--- a/sys/nfs/nfssvc.h
+++ b/sys/nfs/nfssvc.h
@@ -69,6 +69,7 @@
 #define	NFSSVC_SUSPENDNFSD	0x04000000
 #define	NFSSVC_RESUMENFSD	0x08000000
 #define	NFSSVC_DUMPMNTOPTS	0x10000000
+#define	NFSSVC_NEWSTRUCT	0x20000000
 
 /* Argument structure for NFSSVC_DUMPMNTOPTS. */
 struct nfscl_dumpmntopts {