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  *
  46  * Lovsub object operations.
  47  *
  48  */
  49
  50 static int lovsub_object_init(const struct lu_env *env, struct lu_object *obj,
  51                               const struct lu_object_conf *conf)
  52 {
  53         struct lovsub_device *dev = lu2lovsub_dev(obj->lo_dev);
  54         struct lu_object *below;
  55         struct lu_device *under;
  56         int result;
  57
  58         ENTRY;
  59         under = &dev->acid_next->cd_lu_dev;
  60         below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
  61         if (below) {
  62                 lu_object_add(obj, below);
  63                 cl_object_page_init(lu2cl(obj), 0);
  64                 result = 0;
  65         } else
  66                 result = -ENOMEM;
  67         RETURN(result);
  68
  69 }
  70
  71 static void lovsub_object_free_rcu(struct rcu_head *head)
  72 {
  73         struct lovsub_object *los = container_of(head, struct lovsub_object,
  74                                                  lso_header.coh_lu.loh_rcu);
  75
  76         kmem_cache_free(lovsub_object_kmem, los);
  77 }
  78
  79 static void lovsub_object_free(const struct lu_env *env, struct lu_object *obj)
  80 {
  81         struct lovsub_object *los = lu2lovsub(obj);
  82         struct lov_object *lov = los->lso_super;
  83
  84         ENTRY;
  85
  86         /*
  87          * We can't assume lov was assigned here, because of the shadow
  88          * object handling in lu_object_find.
  89          */
  90         if (lov) {
  91                 int index = lov_comp_entry(los->lso_index);
  92                 int stripe = lov_comp_stripe(los->lso_index);
  93                 struct lov_layout_raid0 *r0 = lov_r0(lov, index);
  94
  95                 LASSERT(lov->lo_type == LLT_COMP);
  96                 LASSERT(r0->lo_sub[stripe] == los);
  97                 spin_lock(&r0->lo_sub_lock);
  98                 r0->lo_sub[stripe] = NULL;
  99                 spin_unlock(&r0->lo_sub_lock);
 100         }
 101
 102         lu_object_fini(obj);
 103         lu_object_header_fini(&los->lso_header.coh_lu);
 104         OBD_FREE_PRE(los, sizeof(*los), "slab-freed");
 105         call_rcu(&los->lso_header.coh_lu.loh_rcu, lovsub_object_free_rcu);
 106         EXIT;
 107 }
 108
 109 static int lovsub_object_print(const struct lu_env *env, void *cookie,
 110                                lu_printer_t p, const struct lu_object *obj)
 111 {
 112         struct lovsub_object *los = lu2lovsub(obj);
 113
 114         return (*p)(env, cookie, "[%d]", los->lso_index);
 115 }
 116
 117 static int lovsub_attr_update(const struct lu_env *env, struct cl_object *obj,
 118                               const struct cl_attr *attr, unsigned valid)
 119 {
 120         struct lovsub_object *los = cl2lovsub(obj);
 121         struct lov_object *lov = cl2lovsub(obj)->lso_super;
 122
 123         ENTRY;
 124         lov_r0(lov, lov_comp_entry(los->lso_index))->lo_attr_valid = 0;
 125         RETURN(0);
 126 }
 127
 128 static int lovsub_object_glimpse(const struct lu_env *env,
 129                                  const struct cl_object *obj,
 130                                  struct ost_lvb *lvb)
 131 {
 132         struct lovsub_object *los = cl2lovsub(obj);
 133
 134         ENTRY;
 135         RETURN(cl_object_glimpse(env, &los->lso_super->lo_cl, lvb));
 136 }
 137
 138 /**
 139  * Implementation of struct cl_object_operations::coo_req_attr_set() for lovsub
 140  * layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
 141  * field, which is filled there.
 142  */
 143 static void lovsub_req_attr_set(const struct lu_env *env, struct cl_object *obj,
 144                                 struct cl_req_attr *attr)
 145 {
 146         struct lovsub_object *subobj = cl2lovsub(obj);
 147         struct lov_stripe_md *lsm = subobj->lso_super->lo_lsm;
 148
 149         ENTRY;
 150         cl_req_attr_set(env, &subobj->lso_super->lo_cl, attr);
 151
 152         /*
 153          * There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
 154          * unconditionally. It never changes anyway.
 155          */
 156         attr->cra_oa->o_stripe_idx = lov_comp_stripe(subobj->lso_index);
 157         lov_lsm2layout(lsm, lsm->lsm_entries[lov_comp_entry(subobj->lso_index)],
 158                        &attr->cra_oa->o_layout);
 159         attr->cra_oa->o_valid |= OBD_MD_FLOSTLAYOUT;
 160         EXIT;
 161 }
 162
 163 static const struct cl_object_operations lovsub_ops = {
 164         .coo_attr_update  = lovsub_attr_update,
 165         .coo_glimpse      = lovsub_object_glimpse,
 166         .coo_req_attr_set = lovsub_req_attr_set
 167 };
 168
 169 static const struct lu_object_operations lovsub_lu_obj_ops = {
 170         .loo_object_init      = lovsub_object_init,
 171         .loo_object_delete    = NULL,
 172         .loo_object_release   = NULL,
 173         .loo_object_free      = lovsub_object_free,
 174         .loo_object_print     = lovsub_object_print,
 175         .loo_object_invariant = NULL
 176 };
 177
 178 struct lu_object *lovsub_object_alloc(const struct lu_env *env,
 179                                       const struct lu_object_header *unused,
 180                                       struct lu_device *dev)
 181 {
 182         struct lovsub_object *los;
 183         struct lu_object     *obj;
 184
 185         ENTRY;
 186         OBD_SLAB_ALLOC_PTR_GFP(los, lovsub_object_kmem, GFP_NOFS);
 187         if (los) {
 188                 struct cl_object_header *hdr;
 189
 190                 obj = lovsub2lu(los);
 191                 hdr = &los->lso_header;
 192                 cl_object_header_init(hdr);
 193                 lu_object_init(obj, &hdr->coh_lu, dev);
 194                 lu_object_add_top(&hdr->coh_lu, obj);
 195                 los->lso_cl.co_ops = &lovsub_ops;
 196                 obj->lo_ops = &lovsub_lu_obj_ops;
 197         } else
 198                 obj = NULL;
 199         RETURN(obj);
 200 }
 201
 202 /** @} lov */