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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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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 * Lovsub transfer operations.
51 static void lovsub_req_completion(const struct lu_env *env,
52 const struct cl_req_slice *slice, int ioret)
54 struct lovsub_req *lsr;
56 lsr = cl2lovsub_req(slice);
57 kmem_cache_free(lovsub_req_kmem, lsr);
61 * Implementation of struct cl_req_operations::cro_attr_set() for lovsub
62 * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
63 * field, which is filled there.
65 static void lovsub_req_attr_set(const struct lu_env *env,
66 const struct cl_req_slice *slice,
67 const struct cl_object *obj,
68 struct cl_req_attr *attr, u64 flags)
70 struct lovsub_object *subobj;
72 subobj = cl2lovsub(obj);
74 * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
75 * unconditionally. It never changes anyway.
77 attr->cra_oa->o_stripe_idx = subobj->lso_index;
80 static const struct cl_req_operations lovsub_req_ops = {
81 .cro_attr_set = lovsub_req_attr_set,
82 .cro_completion = lovsub_req_completion
85 /*****************************************************************************
87 * Lov-sub device and device type functions.
91 static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
92 const char *name, struct lu_device *next)
94 struct lovsub_device *lsd = lu2lovsub_dev(d);
95 struct lu_device_type *ldt;
98 next->ld_site = d->ld_site;
100 rc = ldt->ldt_ops->ldto_device_init(env, next, ldt->ldt_name, NULL);
102 next->ld_site = NULL;
107 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
108 lsd->acid_next = lu2cl_dev(next);
112 static struct lu_device *lovsub_device_fini(const struct lu_env *env,
115 struct lu_device *next;
116 struct lovsub_device *lsd;
118 lsd = lu2lovsub_dev(d);
119 next = cl2lu_dev(lsd->acid_next);
120 lsd->acid_super = NULL;
121 lsd->acid_next = NULL;
125 static struct lu_device *lovsub_device_free(const struct lu_env *env,
128 struct lovsub_device *lsd = lu2lovsub_dev(d);
129 struct lu_device *next = cl2lu_dev(lsd->acid_next);
131 if (atomic_read(&d->ld_ref) && d->ld_site) {
132 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
133 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
135 cl_device_fini(lu2cl_dev(d));
140 static int lovsub_req_init(const struct lu_env *env, struct cl_device *dev,
143 struct lovsub_req *lsr;
146 lsr = kmem_cache_zalloc(lovsub_req_kmem, GFP_NOFS);
148 cl_req_slice_add(req, &lsr->lsrq_cl, dev, &lovsub_req_ops);
156 static const struct lu_device_operations lovsub_lu_ops = {
157 .ldo_object_alloc = lovsub_object_alloc,
158 .ldo_process_config = NULL,
159 .ldo_recovery_complete = NULL
162 static const struct cl_device_operations lovsub_cl_ops = {
163 .cdo_req_init = lovsub_req_init
166 static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
167 struct lu_device_type *t,
168 struct lustre_cfg *cfg)
171 struct lovsub_device *lsd;
173 lsd = kzalloc(sizeof(*lsd), GFP_NOFS);
177 result = cl_device_init(&lsd->acid_cl, t);
179 d = lovsub2lu_dev(lsd);
180 d->ld_ops = &lovsub_lu_ops;
181 lsd->acid_cl.cd_ops = &lovsub_cl_ops;
186 d = ERR_PTR(-ENOMEM);
191 static const struct lu_device_type_operations lovsub_device_type_ops = {
192 .ldto_device_alloc = lovsub_device_alloc,
193 .ldto_device_free = lovsub_device_free,
195 .ldto_device_init = lovsub_device_init,
196 .ldto_device_fini = lovsub_device_fini
199 #define LUSTRE_LOVSUB_NAME "lovsub"
201 struct lu_device_type lovsub_device_type = {
202 .ldt_tags = LU_DEVICE_CL,
203 .ldt_name = LUSTRE_LOVSUB_NAME,
204 .ldt_ops = &lovsub_device_type_ops,
205 .ldt_ctx_tags = LCT_CL_THREAD