nfs: remove unused writeverf code

Remove duplicate writeverf structure from merge of nfs_pgio_header and
nfs_pgio_data and remove writeverf related flags and logic to handle
more than one RPC per nfs_pgio_header.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/objlayout/objlayout.c b/fs/nfs/objlayout/objlayout.c
index 8631278..697a16d 100644
--- a/fs/nfs/objlayout/objlayout.c
+++ b/fs/nfs/objlayout/objlayout.c
@@ -328,7 +328,7 @@
 	oir->status = hdr->task.tk_status = status;
 	if (status >= 0) {
 		hdr->res.count = status;
-		hdr->writeverf.committed = oir->committed;
+		hdr->verf.committed = oir->committed;
 	} else {
 		hdr->pnfs_error = status;
 	}
@@ -336,7 +336,7 @@
 	/* must not use oir after this point */
 
 	dprintk("%s: Return status %zd committed %d sync=%d\n", __func__,
-		status, hdr->writeverf.committed, sync);
+		status, hdr->verf.committed, sync);
 
 	if (sync)
 		pnfs_ld_write_done(hdr);