NFSv4.1/pnfs: Mark the layout stateid invalid when all segments are removed

According to RFC5661, section 12.5.3. the layout stateid is no longer
valid once the client no longer holds any layout segments. Ensure that
we mark it invalid.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index ca488b52cbfb..0fbe734cc38c 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -361,8 +361,10 @@ pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
         list_del_init(&lseg->pls_list);
         /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
         atomic_dec(&lo->plh_refcount);
-        if (list_empty(&lo->plh_segs))
+        if (list_empty(&lo->plh_segs)) {
+                set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
                 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
+        }
         rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
 }