LXR linux/drivers/staging/lustre/lustre/llite/vvp

   1/*
   2 * GPL HEADER START
   3 *
   4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 only,
   8 * as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License version 2 for more details (a copy is included
  14 * in the LICENSE file that accompanied this code).
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * version 2 along with this program; If not, see
  18 * http://www.gnu.org/licenses/gpl-2.0.html
  19 *
  20 * GPL HEADER END
  21 */
  22/*
  23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24 * Use is subject to license terms.
  25 *
  26 * Copyright (c) 2014, 2015, Intel Corporation.
  27 */
  28/*
  29 * This file is part of Lustre, http://www.lustre.org/
  30 * Lustre is a trademark of Sun Microsystems, Inc.
  31 *
  32 * Implementation of cl_lock for VVP layer.
  33 *
  34 *   Author: Nikita Danilov <nikita.danilov@sun.com>
  35 */
  36
  37#define DEBUG_SUBSYSTEM S_LLITE
  38
  39#include "../include/obd_support.h"
  40
  41#include "vvp_internal.h"
  42
  43/*****************************************************************************
  44 *
  45 * Vvp lock functions.
  46 *
  47 */
  48
  49static void vvp_lock_fini(const struct lu_env *env, struct cl_lock_slice *slice)
  50{
  51        struct vvp_lock *vlk = cl2vvp_lock(slice);
  52
  53        kmem_cache_free(vvp_lock_kmem, vlk);
  54}
  55
  56static int vvp_lock_enqueue(const struct lu_env *env,
  57                            const struct cl_lock_slice *slice,
  58                            struct cl_io *unused, struct cl_sync_io *anchor)
  59{
  60        CLOBINVRNT(env, slice->cls_obj, vvp_object_invariant(slice->cls_obj));
  61
  62        return 0;
  63}
  64
  65static const struct cl_lock_operations vvp_lock_ops = {
  66        .clo_fini       = vvp_lock_fini,
  67        .clo_enqueue    = vvp_lock_enqueue,
  68};
  69
  70int vvp_lock_init(const struct lu_env *env, struct cl_object *obj,
  71                  struct cl_lock *lock, const struct cl_io *unused)
  72{
  73        struct vvp_lock *vlk;
  74        int result;
  75
  76        CLOBINVRNT(env, obj, vvp_object_invariant(obj));
  77
  78        vlk = kmem_cache_zalloc(vvp_lock_kmem, GFP_NOFS);
  79        if (vlk) {
  80                cl_lock_slice_add(lock, &vlk->vlk_cl, obj, &vvp_lock_ops);
  81                result = 0;
  82        } else {
  83                result = -ENOMEM;
  84        }
  85        return result;
  86}
  87