1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_device and cl_device_type for LOVSUB layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
41 #define DEBUG_SUBSYSTEM S_LOV
43 #include "lov_cl_internal.h"
45 /** \addtogroup lov lov @{ */
47 /*****************************************************************************
49 * Lovsub transfer operations.
53 static void lovsub_req_completion(const struct lu_env *env,
54 const struct cl_req_slice *slice, int ioret)
56 struct lovsub_req *lsr;
59 lsr = cl2lovsub_req(slice);
60 OBD_SLAB_FREE_PTR(lsr, lovsub_req_kmem);
65 * Implementation of struct cl_req_operations::cro_attr_set() for lovsub
66 * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
67 * field, which is filled there.
69 static void lovsub_req_attr_set(const struct lu_env *env,
70 const struct cl_req_slice *slice,
71 const struct cl_object *obj,
72 struct cl_req_attr *attr, obd_valid flags)
74 struct lovsub_object *subobj;
77 subobj = cl2lovsub(obj);
79 * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
80 * unconditionally. It never changes anyway.
82 attr->cra_oa->o_stripe_idx = subobj->lso_index;
86 static const struct cl_req_operations lovsub_req_ops = {
87 .cro_attr_set = lovsub_req_attr_set,
88 .cro_completion = lovsub_req_completion
91 /*****************************************************************************
93 * Lov-sub device and device type functions.
97 static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
98 const char *name, struct lu_device *next)
100 struct lovsub_device *lsd = lu2lovsub_dev(d);
101 struct lu_device_type *ldt;
105 next->ld_site = d->ld_site;
107 LASSERT(ldt != NULL);
108 rc = ldt->ldt_ops->ldto_device_init(env, next, ldt->ldt_name, NULL);
110 next->ld_site = NULL;
115 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
116 lsd->acid_next = lu2cl_dev(next);
120 static struct lu_device *lovsub_device_fini(const struct lu_env *env,
123 struct lu_device *next;
124 struct lovsub_device *lsd;
127 lsd = lu2lovsub_dev(d);
128 next = cl2lu_dev(lsd->acid_next);
129 lsd->acid_super = NULL;
130 lsd->acid_next = NULL;
134 static struct lu_device *lovsub_device_free(const struct lu_env *env,
137 struct lovsub_device *lsd = lu2lovsub_dev(d);
138 struct lu_device *next = cl2lu_dev(lsd->acid_next);
140 cl_device_fini(lu2cl_dev(d));
145 static int lovsub_req_init(const struct lu_env *env, struct cl_device *dev,
148 struct lovsub_req *lsr;
151 OBD_SLAB_ALLOC_PTR(lsr, lovsub_req_kmem);
153 cl_req_slice_add(req, &lsr->lsrq_cl, dev, &lovsub_req_ops);
160 static const struct lu_device_operations lovsub_lu_ops = {
161 .ldo_object_alloc = lovsub_object_alloc,
162 .ldo_process_config = NULL,
163 .ldo_recovery_complete = NULL
166 static const struct cl_device_operations lovsub_cl_ops = {
167 .cdo_req_init = lovsub_req_init
170 static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
171 struct lu_device_type *t,
172 struct lustre_cfg *cfg)
175 struct lovsub_device *lsd;
181 result = cl_device_init(&lsd->acid_cl, t);
183 d = lovsub2lu_dev(lsd);
184 d->ld_ops = &lovsub_lu_ops;
185 lsd->acid_cl.cd_ops = &lovsub_cl_ops;
189 d = ERR_PTR(-ENOMEM);
193 static const struct lu_device_type_operations lovsub_device_type_ops = {
194 .ldto_device_alloc = lovsub_device_alloc,
195 .ldto_device_free = lovsub_device_free,
197 .ldto_device_init = lovsub_device_init,
198 .ldto_device_fini = lovsub_device_fini
201 #define LUSTRE_LOVSUB_NAME "lovsub"
203 struct lu_device_type lovsub_device_type = {
204 .ldt_tags = LU_DEVICE_CL,
205 .ldt_name = LUSTRE_LOVSUB_NAME,
206 .ldt_ops = &lovsub_device_type_ops,
207 .ldt_ctx_tags = LCT_CL_THREAD