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34 * Implementation of cl_device and cl_device_type for LOVSUB layer.
36 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 #define DEBUG_SUBSYSTEM S_LOV
41 #include "lov_cl_internal.h"
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;
58 lsr = cl2lovsub_req(slice);
59 kmem_cache_free(lovsub_req_kmem, lsr);
63 * Implementation of struct cl_req_operations::cro_attr_set() for lovsub
64 * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
65 * field, which is filled there.
67 static void lovsub_req_attr_set(const struct lu_env *env,
68 const struct cl_req_slice *slice,
69 const struct cl_object *obj,
70 struct cl_req_attr *attr, u64 flags)
72 struct lovsub_object *subobj;
74 subobj = cl2lovsub(obj);
76 * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
77 * unconditionally. It never changes anyway.
79 attr->cra_oa->o_stripe_idx = subobj->lso_index;
82 static const struct cl_req_operations lovsub_req_ops = {
83 .cro_attr_set = lovsub_req_attr_set,
84 .cro_completion = lovsub_req_completion
87 /*****************************************************************************
89 * Lov-sub device and device type functions.
93 static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
94 const char *name, struct lu_device *next)
96 struct lovsub_device *lsd = lu2lovsub_dev(d);
97 struct lu_device_type *ldt;
100 next->ld_site = d->ld_site;
102 LASSERT(ldt != NULL);
103 rc = ldt->ldt_ops->ldto_device_init(env, next, ldt->ldt_name, NULL);
105 next->ld_site = NULL;
110 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
111 lsd->acid_next = lu2cl_dev(next);
115 static struct lu_device *lovsub_device_fini(const struct lu_env *env,
118 struct lu_device *next;
119 struct lovsub_device *lsd;
121 lsd = lu2lovsub_dev(d);
122 next = cl2lu_dev(lsd->acid_next);
123 lsd->acid_super = NULL;
124 lsd->acid_next = NULL;
128 static struct lu_device *lovsub_device_free(const struct lu_env *env,
131 struct lovsub_device *lsd = lu2lovsub_dev(d);
132 struct lu_device *next = cl2lu_dev(lsd->acid_next);
134 if (atomic_read(&d->ld_ref) && d->ld_site) {
135 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
136 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
138 cl_device_fini(lu2cl_dev(d));
143 static int lovsub_req_init(const struct lu_env *env, struct cl_device *dev,
146 struct lovsub_req *lsr;
149 lsr = kmem_cache_alloc(lovsub_req_kmem, GFP_NOFS | __GFP_ZERO);
151 cl_req_slice_add(req, &lsr->lsrq_cl, dev, &lovsub_req_ops);
158 static const struct lu_device_operations lovsub_lu_ops = {
159 .ldo_object_alloc = lovsub_object_alloc,
160 .ldo_process_config = NULL,
161 .ldo_recovery_complete = NULL
164 static const struct cl_device_operations lovsub_cl_ops = {
165 .cdo_req_init = lovsub_req_init
168 static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
169 struct lu_device_type *t,
170 struct lustre_cfg *cfg)
173 struct lovsub_device *lsd;
175 lsd = kzalloc(sizeof(*lsd), GFP_NOFS);
179 result = cl_device_init(&lsd->acid_cl, t);
181 d = lovsub2lu_dev(lsd);
182 d->ld_ops = &lovsub_lu_ops;
183 lsd->acid_cl.cd_ops = &lovsub_cl_ops;
187 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