NFSv4: Simplify some cache consistency post-op GETATTRs

Certain asynchronous operations such as write() do not expect
(or care) that other metadata such as the file owner, mode, acls, ...
change. All they want to do is update and/or check the change attribute,
ctime, and mtime.
By skipping the file owner and group update, we also avoid having to do a
potential idmapper upcall for these asynchronous RPC calls.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 9bb81aec91cf..29b1e40dce99 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -106,6 +106,11 @@ struct nfs_server {
         u32                     attr_bitmask[2];/* V4 bitmask representing the set
                                                    of attributes supported on this
                                                    filesystem */
+        u32                     cache_consistency_bitmask[2];
+                                                /* V4 bitmask representing the subset
+                                                   of change attribute, size, ctime
+                                                   and mtime attributes supported by
+                                                   the server */
         u32                     acl_bitmask;    /* V4 bitmask representing the ACEs
                                                    that are supported on this
                                                    filesystem */