NFS: Request fh_expire_type attribute in "server caps" operation

The fh_expire_type file attribute is a filesystem wide attribute that
consists of flags that indicate what characteristics file handles
on this FSID have.

Our client doesn't support volatile file handles.  It should find
out early (say, at mount time) whether the server is going to play
shenanighans with file handles during a migration.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 03d0b91c2d5b..7073fc74481c 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -148,6 +148,9 @@ struct nfs_server {
         u32                     acl_bitmask;    /* V4 bitmask representing the ACEs
                                                    that are supported on this
                                                    filesystem */
+        u32                     fh_expire_type; /* V4 bitmask representing file
+                                                   handle volatility type for
+                                                   this filesystem */
         struct pnfs_layoutdriver_type  *pnfs_curr_ld; /* Active layout driver */
         struct rpc_wait_queue   roc_rpcwaitq;
         void                    *pnfs_ld_data;  /* per mount point data */