svn commit: r317477 - stable/9/sys/fs/nfsclient

[Rick Macklem]

Author: rmacklem
Date: Wed Apr 26 23:32:57 2017
New Revision: 317477
URL: https://svnweb.freebsd.org/changeset/base/317477

Log:
  MFC: r316667
  Fix the NFSv4 client hndling of a stale write verifier in the Commit operation.
  
  When the NFSv4 client Commit operation encountered a stale write verifier,
  it erroneously mapped that to EIO. This could have caused recently written
  data to be lost when a server crashes/reboots between an UNSTABLE write
  and the subsequent commit. This patch fixes this.
  The bug was only for the NFSv4 client and did not affect NFSv3.

Modified:
  stable/9/sys/fs/nfsclient/nfs_clport.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/fs/   (props changed)

Modified: stable/9/sys/fs/nfsclient/nfs_clport.c
==============================================================================
--- stable/9/sys/fs/nfsclient/nfs_clport.c	Wed Apr 26 23:24:05 2017	(r317476)
+++ stable/9/sys/fs/nfsclient/nfs_clport.c	Wed Apr 26 23:32:57 2017	(r317477)
@@ -1129,7 +1129,7 @@ nfscl_maperr(struct thread *td, int erro
 {
 	struct proc *p;
 
-	if (error < 10000)
+	if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
 		return (error);
 	if (td != NULL)
 		p = td->td_proc;