4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2013, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_device and cl_device_type for LOVSUB layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
37 #define DEBUG_SUBSYSTEM S_LOV
39 #include "lov_cl_internal.h"
45 /*****************************************************************************
47 * Lov-sub device and device type functions.
51 static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
52 const char *name, struct lu_device *next)
54 struct lovsub_device *lsd = lu2lovsub_dev(d);
55 struct lu_device_type *ldt;
58 next->ld_site = d->ld_site;
60 rc = ldt->ldt_ops->ldto_device_init(env, next, ldt->ldt_name, NULL);
67 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
68 lsd->acid_next = lu2cl_dev(next);
72 static struct lu_device *lovsub_device_fini(const struct lu_env *env,
75 struct lu_device *next;
76 struct lovsub_device *lsd;
78 lsd = lu2lovsub_dev(d);
79 next = cl2lu_dev(lsd->acid_next);
80 lsd->acid_next = NULL;
84 static struct lu_device *lovsub_device_free(const struct lu_env *env,
87 struct lovsub_device *lsd = lu2lovsub_dev(d);
88 struct lu_device *next = cl2lu_dev(lsd->acid_next);
90 if (atomic_read(&d->ld_ref) && d->ld_site) {
91 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
92 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
94 cl_device_fini(lu2cl_dev(d));
99 static const struct lu_device_operations lovsub_lu_ops = {
100 .ldo_object_alloc = lovsub_object_alloc,
101 .ldo_process_config = NULL,
102 .ldo_recovery_complete = NULL
105 static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
106 struct lu_device_type *t,
107 struct lustre_cfg *cfg)
110 struct lovsub_device *lsd;
112 lsd = kzalloc(sizeof(*lsd), GFP_NOFS);
116 result = cl_device_init(&lsd->acid_cl, t);
118 d = lovsub2lu_dev(lsd);
119 d->ld_ops = &lovsub_lu_ops;
124 d = ERR_PTR(-ENOMEM);
129 static const struct lu_device_type_operations lovsub_device_type_ops = {
130 .ldto_device_alloc = lovsub_device_alloc,
131 .ldto_device_free = lovsub_device_free,
133 .ldto_device_init = lovsub_device_init,
134 .ldto_device_fini = lovsub_device_fini
137 #define LUSTRE_LOVSUB_NAME "lovsub"
139 struct lu_device_type lovsub_device_type = {
140 .ldt_tags = LU_DEVICE_CL,
141 .ldt_name = LUSTRE_LOVSUB_NAME,
142 .ldt_ops = &lovsub_device_type_ops,
143 .ldt_ctx_tags = LCT_CL_THREAD