svn commit: r229830 - stable/8/sys/fs/nfsserver

[Rick Macklem]

Author: rmacklem
Date: Sun Jan  8 23:30:23 2012
New Revision: 229830
URL: http://svn.freebsd.org/changeset/base/229830

Log:
  MFC: r228560
  Patch the new NFS server in a manner analagous to r228520 for the
  old NFS server, so that it correctly handles a count == 0 argument
  for Commit.

Modified:
  stable/8/sys/fs/nfsserver/nfs_nfsdport.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/fs/nfsserver/nfs_nfsdport.c
==============================================================================
--- stable/8/sys/fs/nfsserver/nfs_nfsdport.c	Sun Jan  8 23:11:03 2012	(r229829)
+++ stable/8/sys/fs/nfsserver/nfs_nfsdport.c	Sun Jan  8 23:30:23 2012	(r229830)
@@ -1249,7 +1249,13 @@ nfsvno_fsync(struct vnode *vp, u_int64_t
 {
 	int error = 0;
 
-	if (cnt > MAX_COMMIT_COUNT) {
+	/*
+	 * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
+	 * file is done.  At this time VOP_FSYNC does not accept offset and
+	 * byte count parameters so call VOP_FSYNC the whole file for now.
+	 * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
+	 */
+	if (cnt == 0 || cnt > MAX_COMMIT_COUNT) {
 		/*
 		 * Give up and do the whole thing
 		 */