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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"
49 /*****************************************************************************
51 * Lovsub transfer operations.
55 static void lovsub_req_completion(const struct lu_env *env,
56 const struct cl_req_slice *slice, int ioret)
58 struct lovsub_req *lsr;
61 lsr = cl2lovsub_req(slice);
62 OBD_SLAB_FREE_PTR(lsr, lovsub_req_kmem);
67 * Implementation of struct cl_req_operations::cro_attr_set() for lovsub
68 * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
69 * field, which is filled there.
71 static void lovsub_req_attr_set(const struct lu_env *env,
72 const struct cl_req_slice *slice,
73 const struct cl_object *obj,
74 struct cl_req_attr *attr, u64 flags)
76 struct lovsub_object *subobj;
79 subobj = cl2lovsub(obj);
81 * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
82 * unconditionally. It never changes anyway.
84 attr->cra_oa->o_stripe_idx = subobj->lso_index;
88 static const struct cl_req_operations lovsub_req_ops = {
89 .cro_attr_set = lovsub_req_attr_set,
90 .cro_completion = lovsub_req_completion
93 /*****************************************************************************
95 * Lov-sub device and device type functions.
99 static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
100 const char *name, struct lu_device *next)
102 struct lovsub_device *lsd = lu2lovsub_dev(d);
103 struct lu_device_type *ldt;
107 next->ld_site = d->ld_site;
109 LASSERT(ldt != NULL);
110 rc = ldt->ldt_ops->ldto_device_init(env, next, ldt->ldt_name, NULL);
112 next->ld_site = NULL;
117 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
118 lsd->acid_next = lu2cl_dev(next);
122 static struct lu_device *lovsub_device_fini(const struct lu_env *env,
125 struct lu_device *next;
126 struct lovsub_device *lsd;
129 lsd = lu2lovsub_dev(d);
130 next = cl2lu_dev(lsd->acid_next);
131 lsd->acid_super = NULL;
132 lsd->acid_next = NULL;
136 static struct lu_device *lovsub_device_free(const struct lu_env *env,
139 struct lovsub_device *lsd = lu2lovsub_dev(d);
140 struct lu_device *next = cl2lu_dev(lsd->acid_next);
142 if (atomic_read(&d->ld_ref) && d->ld_site) {
143 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
144 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
146 cl_device_fini(lu2cl_dev(d));
151 static int lovsub_req_init(const struct lu_env *env, struct cl_device *dev,
154 struct lovsub_req *lsr;
157 OBD_SLAB_ALLOC_PTR_GFP(lsr, lovsub_req_kmem, GFP_NOFS);
159 cl_req_slice_add(req, &lsr->lsrq_cl, dev, &lovsub_req_ops);
166 static const struct lu_device_operations lovsub_lu_ops = {
167 .ldo_object_alloc = lovsub_object_alloc,
168 .ldo_process_config = NULL,
169 .ldo_recovery_complete = NULL
172 static const struct cl_device_operations lovsub_cl_ops = {
173 .cdo_req_init = lovsub_req_init
176 static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
177 struct lu_device_type *t,
178 struct lustre_cfg *cfg)
181 struct lovsub_device *lsd;
187 result = cl_device_init(&lsd->acid_cl, t);
189 d = lovsub2lu_dev(lsd);
190 d->ld_ops = &lovsub_lu_ops;
191 lsd->acid_cl.cd_ops = &lovsub_cl_ops;
195 d = ERR_PTR(-ENOMEM);
199 static const struct lu_device_type_operations lovsub_device_type_ops = {
200 .ldto_device_alloc = lovsub_device_alloc,
201 .ldto_device_free = lovsub_device_free,
203 .ldto_device_init = lovsub_device_init,
204 .ldto_device_fini = lovsub_device_fini
207 #define LUSTRE_LOVSUB_NAME "lovsub"
209 struct lu_device_type lovsub_device_type = {
210 .ldt_tags = LU_DEVICE_CL,
211 .ldt_name = LUSTRE_LOVSUB_NAME,
212 .ldt_ops = &lovsub_device_type_ops,
213 .ldt_ctx_tags = LCT_CL_THREAD