svn commit: r336357 - in head/sys/fs: nfs nfsserver

[Rick Macklem]

Author: rmacklem
Date: Mon Jul 16 21:32:50 2018
New Revision: 336357
URL: https://svnweb.freebsd.org/changeset/base/336357

Log:
  Modify the reasons for not issuing a delegation in the NFSv4.1 server.
  
  The ESXi NFSv4.1 client will generate warning messages when the reason for
  not issuing a delegation is two. Two refers to a resource limit and I do
  not see why it would be considered invalid. However it probably was not the
  best choice of reason for not issuing a delegation.
  This patch changes the reasons used to ones that the ESXi client doesn't
  complain about. This change does not affect the FreeBSD client and does
  not appear to affect behaviour of the Linux NFSv4.1 client.
  RFC5661 defines these "reasons" but does not give any guidance w.r.t. which
  ones are more appropriate to return to a client.
  
  Tested by:	andreas.nagy at frequentis.com
  PR:		226650
  MFC after:	2 weeks

Modified:
  head/sys/fs/nfs/nfsproto.h
  head/sys/fs/nfsserver/nfs_nfsdserv.c
  head/sys/fs/nfsserver/nfs_nfsdstate.c

Modified: head/sys/fs/nfs/nfsproto.h
==============================================================================
--- head/sys/fs/nfs/nfsproto.h	Mon Jul 16 19:47:57 2018	(r336356)
+++ head/sys/fs/nfs/nfsproto.h	Mon Jul 16 21:32:50 2018	(r336357)
@@ -568,6 +568,7 @@
 #define	NFSV4OPEN_WDRESOURCE		0x00080000
 #define	NFSV4OPEN_WDCONTENTION		0x00100000
 #define	NFSV4OPEN_WDNOTWANTED		0x00200000
+#define	NFSV4OPEN_WDSUPPFTYPE		0x00400000
 
 /*
  * NFS V4 File Handle types

Modified: head/sys/fs/nfsserver/nfs_nfsdserv.c
==============================================================================
--- head/sys/fs/nfsserver/nfs_nfsdserv.c	Mon Jul 16 19:47:57 2018	(r336356)
+++ head/sys/fs/nfsserver/nfs_nfsdserv.c	Mon Jul 16 21:32:50 2018	(r336357)
@@ -3095,7 +3095,13 @@ nfsrvd_open(struct nfsrv_descript *nd, __unused int is
 			*tl = txdr_unsigned(NFSV4OPEN_DELEGATEWRITE);
 		else if (retext != 0) {
 			*tl = txdr_unsigned(NFSV4OPEN_DELEGATENONEEXT);
-			if ((rflags & NFSV4OPEN_WDCONTENTION) != 0) {
+			if ((rflags & NFSV4OPEN_WDNOTWANTED) != 0) {
+				NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
+				*tl = txdr_unsigned(NFSV4OPEN_NOTWANTED);
+			} else if ((rflags & NFSV4OPEN_WDSUPPFTYPE) != 0) {
+				NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
+				*tl = txdr_unsigned(NFSV4OPEN_NOTSUPPFTYPE);
+			} else if ((rflags & NFSV4OPEN_WDCONTENTION) != 0) {
 				NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 				*tl++ = txdr_unsigned(NFSV4OPEN_CONTENTION);
 				*tl = newnfs_false;

Modified: head/sys/fs/nfsserver/nfs_nfsdstate.c
==============================================================================
--- head/sys/fs/nfsserver/nfs_nfsdstate.c	Mon Jul 16 19:47:57 2018	(r336356)
+++ head/sys/fs/nfsserver/nfs_nfsdstate.c	Mon Jul 16 21:32:50 2018	(r336357)
@@ -3097,7 +3097,13 @@ tryagain:
 		    /*
 		     * This is where we can choose to issue a delegation.
 		     */
-		    if (delegate == 0 || writedeleg == 0 ||
+		    if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
+			*rflagsp |= NFSV4OPEN_WDNOTWANTED;
+		    else if (nfsrv_issuedelegs == 0)
+			*rflagsp |= NFSV4OPEN_WDSUPPFTYPE;
+		    else if (NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
+			*rflagsp |= NFSV4OPEN_WDRESOURCE;
+		    else if (delegate == 0 || writedeleg == 0 ||
 			NFSVNO_EXRDONLY(exp) || (readonly != 0 &&
 			nfsrv_writedelegifpos == 0) ||
 			!NFSVNO_DELEGOK(vp) ||
@@ -3105,11 +3111,6 @@ tryagain:
 			(clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
 			 LCL_CALLBACKSON)
 			*rflagsp |= NFSV4OPEN_WDCONTENTION;
-		    else if (nfsrv_issuedelegs == 0 ||
-			NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
-			*rflagsp |= NFSV4OPEN_WDRESOURCE;
-		    else if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
-			*rflagsp |= NFSV4OPEN_WDNOTWANTED;
 		    else {
 			new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
 			new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
@@ -3160,16 +3161,17 @@ tryagain:
 		    /*
 		     * This is where we can choose to issue a delegation.
 		     */
-		    if (delegate == 0 || (writedeleg == 0 && readonly == 0) ||
-			!NFSVNO_DELEGOK(vp) ||
+		    if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
+			*rflagsp |= NFSV4OPEN_WDNOTWANTED;
+		    else if (nfsrv_issuedelegs == 0)
+			*rflagsp |= NFSV4OPEN_WDSUPPFTYPE;
+		    else if (NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
+			*rflagsp |= NFSV4OPEN_WDRESOURCE;
+		    else if (delegate == 0 || (writedeleg == 0 &&
+			readonly == 0) || !NFSVNO_DELEGOK(vp) ||
 			(clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
 			 LCL_CALLBACKSON)
 			*rflagsp |= NFSV4OPEN_WDCONTENTION;
-		    else if (nfsrv_issuedelegs == 0 ||
-			NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
-			*rflagsp |= NFSV4OPEN_WDRESOURCE;
-		    else if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
-			*rflagsp |= NFSV4OPEN_WDNOTWANTED;
 		    else {
 			new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
 			new_deleg->ls_stateid.other[0] = delegstateidp->other[0]