nfs/nlm: procedures for PC clients

*  This change introduces four NLMv4 procedures:

   NM_LOCK, SHARE, UNSHARE and FREE_ALL.

   These are used by PC clients (windows/dos) to control access
   to files.

   1. NM_LOCK: this lock is not monitored by statd.

   2. SHARE: A share reservation is a lock on the whole file
      that is taken whenever a file is opened on windows clients.
      This has ACCESS (N, R, W, RW) and DENY MODE (N, R, W, RW).
        ACCESS:    mode of access requested by the client;
        DENY MODE: what the requesting client wants to
                   deny other clients.

   3. UNSHARE: remove a share reservation obtained by SHARE.
      Called while closing a file.

   4. FREE_ALL: remove all share reservations and locks,
      both monitored and unmonitored, of the calling client.

*  lock and nm_lock use a common function with only
   a flag conveying whether or not to monitor a lock.

*  NOTES:
   1. SHARE reservations are not STACK_WIND'd to subsequent xlators.
      These are maintained in-memory in the nfs xlator.

   2. Consequently, for SHARE reservations to work effectively,
      all PC clients  *must* mount from the same gNfs server.
      Not doing so will result in different servers maintaining
      separate SHARE reservations which will not be enforced
      for obvious reasons.

Change-Id: Id4f22670a94ed58691a6a7f4c80aa8c11421a277
BUG: 800287
Signed-off-by: Rajesh Amaravathi <rajesh@redhat.com>
Reviewed-on: http://review.gluster.com/3212
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishna Srinivas <krishna@gluster.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/rpc/xdr/src/msg-nfs3.c b/rpc/xdr/src/msg-nfs3.c
index f800b3128fa..8078f23f097 100644
--- a/rpc/xdr/src/msg-nfs3.c
+++ b/rpc/xdr/src/msg-nfs3.c
@@ -517,6 +517,20 @@ xdr_to_nlm4_unlockargs (struct iovec inmsg, nlm4_unlockargs *args)
 }
 
 ssize_t
+xdr_to_nlm4_shareargs (struct iovec inmsg, nlm4_shareargs *args)
+{
+        return xdr_to_generic (inmsg, (void*)args,
+                               (xdrproc_t)xdr_nlm4_shareargs);
+}
+
+ssize_t
+xdr_serialize_nlm4_shareres (struct iovec outmsg, nlm4_shareres *res)
+{
+        return xdr_serialize_generic (outmsg, (void *)res,
+                                      (xdrproc_t)xdr_nlm4_shareres);
+}
+
+ssize_t
 xdr_serialize_nlm4_testargs (struct iovec outmsg, nlm4_testargs *args)
 {
         return xdr_serialize_generic (outmsg, (void*)args,
@@ -530,3 +544,9 @@ xdr_to_nlm4_res (struct iovec inmsg, nlm4_res *args)
                                (xdrproc_t)xdr_nlm4_res);
 }
 
+ssize_t
+xdr_to_nlm4_freeallargs (struct iovec inmsg, nlm4_freeallargs *args)
+{
+        return xdr_to_generic (inmsg, (void*)args,
+                               (xdrproc_t)xdr_nlm4_freeallargs);
+}