NFS: Fake up 'wcc' attributes to prevent cache invalidation after write

NFSv2 and v4 don't offer weak cache consistency attributes on WRITE calls.
In NFSv3, returning wcc data is optional. In all cases, we want to prevent
the client from invalidating our cached data whenever ->write_done()
attempts to update the inode attributes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 03032017ffaa..daab252f2e5c 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -62,7 +62,8 @@ struct nfs_fattr {
 #define NFS_ATTR_FATTR          0x0002          /* post-op attributes */
 #define NFS_ATTR_FATTR_V3       0x0004          /* NFSv3 attributes */
 #define NFS_ATTR_FATTR_V4       0x0008          /* NFSv4 change attribute */
-#define NFS_ATTR_FATTR_V4_REFERRAL      0x0010          /* NFSv4 referral */
+#define NFS_ATTR_WCC_V4         0x0010          /* pre-op change attribute */
+#define NFS_ATTR_FATTR_V4_REFERRAL      0x0020          /* NFSv4 referral */
 
 /*
  * Info on the file system