lustre/lov/lovsub_object.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * Implementation of cl_object for LOVSUB layer.
  33  *
  34  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LOV
  38
  39 #include "lov_cl_internal.h"
  40
  41 /** \addtogroup lov
  42  *  @{
  43  */
  44
  45 /*****************************************************************************
  46  *
  47  * Lovsub object operations.
  48  *
  49  */
  50
  51 int lovsub_object_init(const struct lu_env *env, struct lu_object *obj,
  52                        const struct lu_object_conf *conf)
  53 {
  54         struct lovsub_device *dev = lu2lovsub_dev(obj->lo_dev);
  55         struct lu_object *below;
  56         struct lu_device *under;
  57
  58         int result;
  59
  60         ENTRY;
  61         under = &dev->acid_next->cd_lu_dev;
  62         below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
  63         if (below) {
  64                 lu_object_add(obj, below);
  65                 cl_object_page_init(lu2cl(obj), 0);
  66                 result = 0;
  67         } else
  68                 result = -ENOMEM;
  69         RETURN(result);
  70
  71 }
  72
  73 static void lovsub_object_free_rcu(struct rcu_head *head)
  74 {
  75         struct lovsub_object *los = container_of(head, struct lovsub_object,
  76                                                  lso_header.coh_lu.loh_rcu);
  77
  78         kmem_cache_free(lovsub_object_kmem, los);
  79 }
  80
  81 static void lovsub_object_free(const struct lu_env *env, struct lu_object *obj)
  82 {
  83         struct lovsub_object *los = lu2lovsub(obj);
  84         struct lov_object *lov = los->lso_super;
  85
  86         ENTRY;
  87
  88         /*
  89          * We can't assume lov was assigned here, because of the shadow
  90          * object handling in lu_object_find.
  91          */
  92         if (lov) {
  93                 int index = lov_comp_entry(los->lso_index);
  94                 int stripe = lov_comp_stripe(los->lso_index);
  95                 struct lov_layout_raid0 *r0 = lov_r0(lov, index);
  96
  97                 LASSERT(lov->lo_type == LLT_COMP);
  98                 LASSERT(r0->lo_sub[stripe] == los);
  99                 spin_lock(&r0->lo_sub_lock);
 100                 r0->lo_sub[stripe] = NULL;
 101                 spin_unlock(&r0->lo_sub_lock);
 102         }
 103
 104         lu_object_fini(obj);
 105         lu_object_header_fini(&los->lso_header.coh_lu);
 106         OBD_FREE_PRE(los, sizeof(*los), "slab-freed");
 107         call_rcu(&los->lso_header.coh_lu.loh_rcu, lovsub_object_free_rcu);
 108         EXIT;
 109 }
 110
 111 static int lovsub_object_print(const struct lu_env *env, void *cookie,
 112                                lu_printer_t p, const struct lu_object *obj)
 113 {
 114         struct lovsub_object *los = lu2lovsub(obj);
 115
 116         return (*p)(env, cookie, "[%d]", los->lso_index);
 117 }
 118
 119 static int lovsub_attr_update(const struct lu_env *env, struct cl_object *obj,
 120                               const struct cl_attr *attr, unsigned valid)
 121 {
 122         struct lovsub_object *los = cl2lovsub(obj);
 123         struct lov_object *lov = cl2lovsub(obj)->lso_super;
 124
 125         ENTRY;
 126         lov_r0(lov, lov_comp_entry(los->lso_index))->lo_attr_valid = 0;
 127         RETURN(0);
 128 }
 129
 130 static int lovsub_object_glimpse(const struct lu_env *env,
 131                                  const struct cl_object *obj,
 132                                  struct ost_lvb *lvb)
 133 {
 134         struct lovsub_object *los = cl2lovsub(obj);
 135
 136         ENTRY;
 137         RETURN(cl_object_glimpse(env, &los->lso_super->lo_cl, lvb));
 138 }
 139
 140 /**
 141  * Implementation of struct cl_object_operations::coo_req_attr_set() for lovsub
 142  * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
 143  * field, which is filled there.
 144  */
 145 static void lovsub_req_attr_set(const struct lu_env *env, struct cl_object *obj,
 146                                 struct cl_req_attr *attr)
 147 {
 148         struct lovsub_object *subobj = cl2lovsub(obj);
 149         struct lov_stripe_md *lsm = subobj->lso_super->lo_lsm;
 150
 151         ENTRY;
 152         cl_req_attr_set(env, &subobj->lso_super->lo_cl, attr);
 153
 154         /*
 155          * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
 156          * unconditionally. It never changes anyway.
 157          */
 158         attr->cra_oa->o_stripe_idx = lov_comp_stripe(subobj->lso_index);
 159         lov_lsm2layout(lsm, lsm->lsm_entries[lov_comp_entry(subobj->lso_index)],
 160                        &attr->cra_oa->o_layout);
 161         attr->cra_oa->o_valid |= OBD_MD_FLOSTLAYOUT;
 162         EXIT;
 163 }
 164
 165 static const struct cl_object_operations lovsub_ops = {
 166         .coo_attr_update  = lovsub_attr_update,
 167         .coo_glimpse      = lovsub_object_glimpse,
 168         .coo_req_attr_set = lovsub_req_attr_set
 169 };
 170
 171 static const struct lu_object_operations lovsub_lu_obj_ops = {
 172         .loo_object_init      = lovsub_object_init,
 173         .loo_object_delete    = NULL,
 174         .loo_object_release   = NULL,
 175         .loo_object_free      = lovsub_object_free,
 176         .loo_object_print     = lovsub_object_print,
 177         .loo_object_invariant = NULL
 178 };
 179
 180 struct lu_object *lovsub_object_alloc(const struct lu_env *env,
 181                                       const struct lu_object_header *unused,
 182                                       struct lu_device *dev)
 183 {
 184         struct lovsub_object *los;
 185         struct lu_object     *obj;
 186
 187         ENTRY;
 188         OBD_SLAB_ALLOC_PTR_GFP(los, lovsub_object_kmem, GFP_NOFS);
 189         if (los) {
 190                 struct cl_object_header *hdr;
 191
 192                 obj = lovsub2lu(los);
 193                 hdr = &los->lso_header;
 194                 cl_object_header_init(hdr);
 195                 lu_object_init(obj, &hdr->coh_lu, dev);
 196                 lu_object_add_top(&hdr->coh_lu, obj);
 197                 los->lso_cl.co_ops = &lovsub_ops;
 198                 obj->lo_ops = &lovsub_lu_obj_ops;
 199         } else
 200                 obj = NULL;
 201         RETURN(obj);
 202 }
 203
 204 /** @} lov */