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29 * This file is part of Lustre, http://www.lustre.org/
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32 * Implementation of cl_object 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 object operations.
51 static int lovsub_object_init(const struct lu_env *env, struct lu_object *obj,
52 const struct lu_object_conf *conf)
54 struct lovsub_device *dev = lu2lovsub_dev(obj->lo_dev);
55 struct lu_object *below;
56 struct lu_device *under;
60 under = &dev->acid_next->cd_lu_dev;
61 below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
63 lu_object_add(obj, below);
64 cl_object_page_init(lu2cl(obj), 0);
72 static void lovsub_object_free_rcu(struct rcu_head *head)
74 struct lovsub_object *los = container_of(head, struct lovsub_object,
75 lso_header.coh_lu.loh_rcu);
77 kmem_cache_free(lovsub_object_kmem, los);
80 static void lovsub_object_free(const struct lu_env *env, struct lu_object *obj)
82 struct lovsub_object *los = lu2lovsub(obj);
83 struct lov_object *lov = los->lso_super;
88 * We can't assume lov was assigned here, because of the shadow
89 * object handling in lu_object_find.
92 int index = lov_comp_entry(los->lso_index);
93 int stripe = lov_comp_stripe(los->lso_index);
94 struct lov_layout_raid0 *r0 = lov_r0(lov, index);
96 LASSERT(lov->lo_type == LLT_COMP);
97 LASSERT(r0->lo_sub[stripe] == los);
98 spin_lock(&r0->lo_sub_lock);
99 r0->lo_sub[stripe] = NULL;
100 spin_unlock(&r0->lo_sub_lock);
104 lu_object_header_fini(&los->lso_header.coh_lu);
105 OBD_FREE_PRE(los, sizeof(*los), "slab-freed");
106 call_rcu(&los->lso_header.coh_lu.loh_rcu, lovsub_object_free_rcu);
110 static int lovsub_object_print(const struct lu_env *env, void *cookie,
111 lu_printer_t p, const struct lu_object *obj)
113 struct lovsub_object *los = lu2lovsub(obj);
115 return (*p)(env, cookie, "[%d]", los->lso_index);
118 static int lovsub_attr_update(const struct lu_env *env, struct cl_object *obj,
119 const struct cl_attr *attr, unsigned valid)
121 struct lovsub_object *los = cl2lovsub(obj);
122 struct lov_object *lov = cl2lovsub(obj)->lso_super;
125 lov_r0(lov, lov_comp_entry(los->lso_index))->lo_attr_valid = 0;
129 static int lovsub_object_glimpse(const struct lu_env *env,
130 const struct cl_object *obj,
133 struct lovsub_object *los = cl2lovsub(obj);
136 RETURN(cl_object_glimpse(env, &los->lso_super->lo_cl, lvb));
140 * Implementation of struct cl_object_operations::coo_req_attr_set() for lovsub
141 * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
142 * field, which is filled there.
144 static void lovsub_req_attr_set(const struct lu_env *env, struct cl_object *obj,
145 struct cl_req_attr *attr)
147 struct lovsub_object *subobj = cl2lovsub(obj);
148 struct lov_stripe_md *lsm = subobj->lso_super->lo_lsm;
151 cl_req_attr_set(env, &subobj->lso_super->lo_cl, attr);
154 * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
155 * unconditionally. It never changes anyway.
157 attr->cra_oa->o_stripe_idx = lov_comp_stripe(subobj->lso_index);
158 lov_lsm2layout(lsm, lsm->lsm_entries[lov_comp_entry(subobj->lso_index)],
159 &attr->cra_oa->o_layout);
160 attr->cra_oa->o_valid |= OBD_MD_FLOSTLAYOUT;
164 static const struct cl_object_operations lovsub_ops = {
165 .coo_attr_update = lovsub_attr_update,
166 .coo_glimpse = lovsub_object_glimpse,
167 .coo_req_attr_set = lovsub_req_attr_set
170 static const struct lu_object_operations lovsub_lu_obj_ops = {
171 .loo_object_init = lovsub_object_init,
172 .loo_object_delete = NULL,
173 .loo_object_release = NULL,
174 .loo_object_free = lovsub_object_free,
175 .loo_object_print = lovsub_object_print,
176 .loo_object_invariant = NULL
179 struct lu_object *lovsub_object_alloc(const struct lu_env *env,
180 const struct lu_object_header *unused,
181 struct lu_device *dev)
183 struct lovsub_object *los;
184 struct lu_object *obj;
187 OBD_SLAB_ALLOC_PTR_GFP(los, lovsub_object_kmem, GFP_NOFS);
189 struct cl_object_header *hdr;
191 obj = lovsub2lu(los);
192 hdr = &los->lso_header;
193 cl_object_header_init(hdr);
194 lu_object_init(obj, &hdr->coh_lu, dev);
195 lu_object_add_top(&hdr->coh_lu, obj);
196 los->lso_cl.co_ops = &lovsub_ops;
197 obj->lo_ops = &lovsub_lu_obj_ops;