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>

5 files changed, 56 insertions, 2 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);
+}
diff --git a/rpc/xdr/src/msg-nfs3.h b/rpc/xdr/src/msg-nfs3.h
index 1310e02f897..701df300a6e 100644
--- a/rpc/xdr/src/msg-nfs3.h
+++ b/rpc/xdr/src/msg-nfs3.h
@@ -203,9 +203,18 @@ extern ssize_t
 xdr_to_nlm4_unlockargs (struct iovec inmsg, nlm4_unlockargs *args);
 
 extern ssize_t
+xdr_to_nlm4_shareargs (struct iovec inmsg, nlm4_shareargs *args);
+
+extern ssize_t
+xdr_serialize_nlm4_shareres (struct iovec outmsg, nlm4_shareres *res);
+
+extern ssize_t
 xdr_serialize_nlm4_testargs (struct iovec outmsg, nlm4_testargs *args);
 
 extern ssize_t
 xdr_to_nlm4_res (struct iovec inmsg, nlm4_res *args);
 
+extern ssize_t
+xdr_to_nlm4_freeallargs (struct iovec inmsg, nlm4_freeallargs *args);
+
 #endif
diff --git a/rpc/xdr/src/nlm4-xdr.c b/rpc/xdr/src/nlm4-xdr.c
index b41fbb15cac..4cf6a51e8fd 100644
--- a/rpc/xdr/src/nlm4-xdr.c
+++ b/rpc/xdr/src/nlm4-xdr.c
@@ -228,6 +228,17 @@ xdr_nlm4_shareres (XDR *xdrs, nlm4_shareres *objp)
 	return TRUE;
 }
 
+bool_t
+xdr_nlm4_freeallargs (XDR *xdrs, nlm4_freeallargs *objp)
+{
+        if (!xdr_string (xdrs, &objp->name, LM_MAXSTRLEN))
+                return FALSE;
+        if (!xdr_uint32_t (xdrs, &objp->state))
+                return FALSE;
+        return TRUE;
+}
+
+
 /*
 bool_t
 xdr_nlm_sm_status (XDR *xdrs, nlm_sm_status *objp)
diff --git a/rpc/xdr/src/nlm4-xdr.h b/rpc/xdr/src/nlm4-xdr.h
index d95a6ad6e58..3799f6b1d98 100644
--- a/rpc/xdr/src/nlm4-xdr.h
+++ b/rpc/xdr/src/nlm4-xdr.h
@@ -183,6 +183,13 @@ struct nlm4_shareres {
 };
 typedef struct nlm4_shareres nlm4_shareres;
 
+struct nlm4_freeallargs {
+        char *name;
+        u_int32_t state;
+};
+typedef struct nlm4_freeallargs nlm4_freeallargs;
+
+
 #define NLM4_NULL          0
 #define NLM4_TEST          1
 #define NLM4_LOCK          2
@@ -229,6 +236,7 @@ extern  bool_t xdr_nlm4_cancargs (XDR *, nlm4_cancargs*);
 extern  bool_t xdr_nlm4_unlockargs (XDR *, nlm4_unlockargs*);
 extern  bool_t xdr_nlm4_shareargs (XDR *, nlm4_shareargs*);
 extern  bool_t xdr_nlm4_shareres (XDR *, nlm4_shareres*);
+extern  bool_t xdr_nlm4_freeallargs (XDR *, nlm4_freeallargs*);
 
 #else /* K&R C */
 extern bool_t xdr_netobj ();
@@ -248,6 +256,7 @@ extern bool_t xdr_nlm4_cancargs ();
 extern bool_t xdr_nlm4_unlockargs ();
 extern bool_t xdr_nlm4_shareargs ();
 extern bool_t xdr_nlm4_shareres ();
+extern bool_t xdr_nlm4_freeallargs ();
 
 #endif /* K&R C */
 
diff --git a/rpc/xdr/src/nlm4.x b/rpc/xdr/src/nlm4.x
index d738b27770d..a6de6f32bf4 100644
--- a/rpc/xdr/src/nlm4.x
+++ b/rpc/xdr/src/nlm4.x
@@ -74,7 +74,7 @@ struct nlm4_holder {
 };
 
 struct nlm4_lock {
-	string caller_name<MAXNAMELEN>;
+	string caller_name<LM_MAXSTRLEN>;
 	netobj fh;
 	netobj oh;
 	u_int32_t svid;
@@ -83,7 +83,7 @@ struct nlm4_lock {
 };
 
 struct nlm4_share {
-	string caller_name<MAXNAMELEN>;
+	string caller_name<LM_MAXSTRLEN>;
 	netobj fh;
 	netobj oh;
 	fsh_mode mode;
@@ -146,6 +146,11 @@ struct	nlm4_shareres {
 	int	sequence;
 };
 
+struct  nlm4_freeallargs {
+        string       name<LM_MAXSTRLEN>;   /* client hostname */
+        uint32       state;                /* unused */
+};
+
 /*
  * argument for the procedure called by rpc.statd when a monitored host
  * status change.