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  *
  31  * Implementation of cl_object for LOVSUB layer.
  32  *
  33  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_LOV
  37
  38 #include "lov_cl_internal.h"
  39
  40 /** \addtogroup lov
  41  *  @{
  42  */
  43
  44 /**
  45  * Lovsub object operations.
  46  */
  47
  48 static int lovsub_object_init(const struct lu_env *env, struct lu_object *obj,
  49                               const struct lu_object_conf *conf)
  50 {
  51         struct lovsub_device *dev = lu2lovsub_dev(obj->lo_dev);
  52         struct lu_object *below;
  53         struct lu_device *under;
  54         int result;
  55
  56         ENTRY;
  57         under = &dev->acid_next->cd_lu_dev;
  58         below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
  59         if (below) {
  60                 lu_object_add(obj, below);
  61                 cl_object_page_init(lu2cl(obj), 0);
  62                 result = 0;
  63         } else
  64                 result = -ENOMEM;
  65         RETURN(result);
  66
  67 }
  68
  69 static void lovsub_object_free_rcu(struct rcu_head *head)
  70 {
  71         struct lovsub_object *los = container_of(head, struct lovsub_object,
  72                                                  lso_header.coh_lu.loh_rcu);
  73
  74         kmem_cache_free(lovsub_object_kmem, los);
  75 }
  76
  77 static void lovsub_object_free(const struct lu_env *env, struct lu_object *obj)
  78 {
  79         struct lovsub_object *los = lu2lovsub(obj);
  80         struct lov_object *lov = los->lso_super;
  81
  82         ENTRY;
  83
  84         /*
  85          * We can't assume lov was assigned here, because of the shadow
  86          * object handling in lu_object_find.
  87          */
  88         if (lov) {
  89                 int index = lov_comp_entry(los->lso_index);
  90                 int stripe = lov_comp_stripe(los->lso_index);
  91                 struct lov_layout_raid0 *r0 = lov_r0(lov, index);
  92
  93                 LASSERT(lov->lo_type == LLT_COMP);
  94                 LASSERT(r0->lo_sub[stripe] == los);
  95                 spin_lock(&r0->lo_sub_lock);
  96                 r0->lo_sub[stripe] = NULL;
  97                 spin_unlock(&r0->lo_sub_lock);
  98         }
  99
 100         lu_object_fini(obj);
 101         lu_object_header_fini(&los->lso_header.coh_lu);
 102         OBD_FREE_PRE(los, sizeof(*los), "slab-freed");
 103         call_rcu(&los->lso_header.coh_lu.loh_rcu, lovsub_object_free_rcu);
 104         EXIT;
 105 }
 106
 107 static int lovsub_object_print(const struct lu_env *env, void *cookie,
 108                                lu_printer_t p, const struct lu_object *obj)
 109 {
 110         struct lovsub_object *los = lu2lovsub(obj);
 111
 112         return (*p)(env, cookie, "[%d]", los->lso_index);
 113 }
 114
 115 static int lovsub_attr_update(const struct lu_env *env, struct cl_object *obj,
 116                               const struct cl_attr *attr, unsigned valid)
 117 {
 118         struct lovsub_object *los = cl2lovsub(obj);
 119         struct lov_object *lov = cl2lovsub(obj)->lso_super;
 120
 121         ENTRY;
 122         lov_r0(lov, lov_comp_entry(los->lso_index))->lo_attr_valid = 0;
 123         RETURN(0);
 124 }
 125
 126 static int lovsub_object_glimpse(const struct lu_env *env,
 127                                  const struct cl_object *obj,
 128                                  struct ost_lvb *lvb)
 129 {
 130         struct lovsub_object *los = cl2lovsub(obj);
 131
 132         ENTRY;
 133         RETURN(cl_object_glimpse(env, &los->lso_super->lo_cl, lvb));
 134 }
 135
 136 /**
 137  * Implementation of struct cl_object_operations::coo_req_attr_set() for lovsub
 138  * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
 139  * field, which is filled there.
 140  */
 141 static void lovsub_req_attr_set(const struct lu_env *env, struct cl_object *obj,
 142                                 struct cl_req_attr *attr)
 143 {
 144         struct lovsub_object *subobj = cl2lovsub(obj);
 145         struct lov_stripe_md *lsm = subobj->lso_super->lo_lsm;
 146
 147         ENTRY;
 148         cl_req_attr_set(env, &subobj->lso_super->lo_cl, attr);
 149
 150         /*
 151          * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
 152          * unconditionally. It never changes anyway.
 153          */
 154         attr->cra_oa->o_stripe_idx = lov_comp_stripe(subobj->lso_index);
 155         lov_lsm2layout(lsm, lsm->lsm_entries[lov_comp_entry(subobj->lso_index)],
 156                        &attr->cra_oa->o_layout);
 157         attr->cra_oa->o_valid |= OBD_MD_FLOSTLAYOUT;
 158         EXIT;
 159 }
 160
 161 static const struct cl_object_operations lovsub_ops = {
 162         .coo_attr_update  = lovsub_attr_update,
 163         .coo_glimpse      = lovsub_object_glimpse,
 164         .coo_req_attr_set = lovsub_req_attr_set
 165 };
 166
 167 static const struct lu_object_operations lovsub_lu_obj_ops = {
 168         .loo_object_init      = lovsub_object_init,
 169         .loo_object_delete    = NULL,
 170         .loo_object_release   = NULL,
 171         .loo_object_free      = lovsub_object_free,
 172         .loo_object_print     = lovsub_object_print,
 173         .loo_object_invariant = NULL
 174 };
 175
 176 struct lu_object *lovsub_object_alloc(const struct lu_env *env,
 177                                       const struct lu_object_header *unused,
 178                                       struct lu_device *dev)
 179 {
 180         struct lovsub_object *los;
 181         struct lu_object     *obj;
 182
 183         ENTRY;
 184         OBD_SLAB_ALLOC_PTR_GFP(los, lovsub_object_kmem, GFP_NOFS);
 185         if (los) {
 186                 struct cl_object_header *hdr;
 187
 188                 obj = lovsub2lu(los);
 189                 hdr = &los->lso_header;
 190                 cl_object_header_init(hdr);
 191                 lu_object_init(obj, &hdr->coh_lu, dev);
 192                 lu_object_add_top(&hdr->coh_lu, obj);
 193                 los->lso_cl.co_ops = &lovsub_ops;
 194                 obj->lo_ops = &lovsub_lu_obj_ops;
 195         } else
 196                 obj = NULL;
 197         RETURN(obj);
 198 }
 199
 200 /** @} lov */