nfsd: convert fi_deleg_file and ls_file fields to nfsd_file

Have them keep an nfsd_file reference instead of a struct file.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
index a79e24b..2681c70 100644
--- a/fs/nfsd/nfs4layouts.c
+++ b/fs/nfsd/nfs4layouts.c
@@ -169,8 +169,8 @@ nfsd4_free_layout_stateid(struct nfs4_stid *stid)
 	spin_unlock(&fp->fi_lock);
 
 	if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
-		vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
-	fput(ls->ls_file);
+		vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls);
+	nfsd_file_put(ls->ls_file);
 
 	if (ls->ls_recalled)
 		atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
@@ -197,7 +197,7 @@ nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
 	fl->fl_end = OFFSET_MAX;
 	fl->fl_owner = ls;
 	fl->fl_pid = current->tgid;
-	fl->fl_file = ls->ls_file;
+	fl->fl_file = ls->ls_file->nf_file;
 
 	status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
 	if (status) {
@@ -236,13 +236,13 @@ nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
 			NFSPROC4_CLNT_CB_LAYOUT);
 
 	if (parent->sc_type == NFS4_DELEG_STID)
-		ls->ls_file = get_file(fp->fi_deleg_file);
+		ls->ls_file = nfsd_file_get(fp->fi_deleg_file);
 	else
 		ls->ls_file = find_any_file(fp);
 	BUG_ON(!ls->ls_file);
 
 	if (nfsd4_layout_setlease(ls)) {
-		fput(ls->ls_file);
+		nfsd_file_put(ls->ls_file);
 		put_nfs4_file(fp);
 		kmem_cache_free(nfs4_layout_stateid_cache, ls);
 		return NULL;
@@ -626,7 +626,7 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
 
 	argv[0] = (char *)nfsd_recall_failed;
 	argv[1] = addr_str;
-	argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
+	argv[2] = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_id;
 	argv[3] = NULL;
 
 	error = call_usermodehelper(nfsd_recall_failed, argv, envp,