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 static 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         int result;
  58
  59         ENTRY;
  60         under = &dev->acid_next->cd_lu_dev;
  61         below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
  62         if (below) {
  63                 lu_object_add(obj, below);
  64                 cl_object_page_init(lu2cl(obj), 0);
  65                 result = 0;
  66         } else
  67                 result = -ENOMEM;
  68         RETURN(result);
  69
  70 }
  71
  72 static void lovsub_object_free_rcu(struct rcu_head *head)
  73 {
  74         struct lovsub_object *los = container_of(head, struct lovsub_object,
  75                                                  lso_header.coh_lu.loh_rcu);
  76
  77         kmem_cache_free(lovsub_object_kmem, los);
  78 }
  79
  80 static void lovsub_object_free(const struct lu_env *env, struct lu_object *obj)
  81 {
  82         struct lovsub_object *los = lu2lovsub(obj);
  83         struct lov_object *lov = los->lso_super;
  84
  85         ENTRY;
  86
  87         /*
  88          * We can't assume lov was assigned here, because of the shadow
  89          * object handling in lu_object_find.
  90          */
  91         if (lov) {
  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);
  95
  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);
 101         }
 102
 103         lu_object_fini(obj);
 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);
 107         EXIT;
 108 }
 109
 110 static int lovsub_object_print(const struct lu_env *env, void *cookie,
 111                                lu_printer_t p, const struct lu_object *obj)
 112 {
 113         struct lovsub_object *los = lu2lovsub(obj);
 114
 115         return (*p)(env, cookie, "[%d]", los->lso_index);
 116 }
 117
 118 static int lovsub_attr_update(const struct lu_env *env, struct cl_object *obj,
 119                               const struct cl_attr *attr, unsigned valid)
 120 {
 121         struct lovsub_object *los = cl2lovsub(obj);
 122         struct lov_object *lov = cl2lovsub(obj)->lso_super;
 123
 124         ENTRY;
 125         lov_r0(lov, lov_comp_entry(los->lso_index))->lo_attr_valid = 0;
 126         RETURN(0);
 127 }
 128
 129 static int lovsub_object_glimpse(const struct lu_env *env,
 130                                  const struct cl_object *obj,
 131                                  struct ost_lvb *lvb)
 132 {
 133         struct lovsub_object *los = cl2lovsub(obj);
 134
 135         ENTRY;
 136         RETURN(cl_object_glimpse(env, &los->lso_super->lo_cl, lvb));
 137 }
 138
 139 /**
 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.
 143  */
 144 static void lovsub_req_attr_set(const struct lu_env *env, struct cl_object *obj,
 145                                 struct cl_req_attr *attr)
 146 {
 147         struct lovsub_object *subobj = cl2lovsub(obj);
 148         struct lov_stripe_md *lsm = subobj->lso_super->lo_lsm;
 149
 150         ENTRY;
 151         cl_req_attr_set(env, &subobj->lso_super->lo_cl, attr);
 152
 153         /*
 154          * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
 155          * unconditionally. It never changes anyway.
 156          */
 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;
 161         EXIT;
 162 }
 163
 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
 168 };
 169
 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
 177 };
 178
 179 struct lu_object *lovsub_object_alloc(const struct lu_env *env,
 180                                       const struct lu_object_header *unused,
 181                                       struct lu_device *dev)
 182 {
 183         struct lovsub_object *los;
 184         struct lu_object     *obj;
 185
 186         ENTRY;
 187         OBD_SLAB_ALLOC_PTR_GFP(los, lovsub_object_kmem, GFP_NOFS);
 188         if (los) {
 189                 struct cl_object_header *hdr;
 190
 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;
 198         } else
 199                 obj = NULL;
 200         RETURN(obj);
 201 }
 202
 203 /** @} lov */