drivers/staging/lustre/lustre/osc/osc_dev.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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * Implementation of cl_device, cl_req for OSC layer.
  37  *
  38  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_OSC
  42
  43 /* class_name2obd() */
  44 #include "../include/obd_class.h"
  45
  46 #include "osc_cl_internal.h"
  47
  48 /** \addtogroup osc
  49  * @{
  50  */
  51
  52 struct kmem_cache *osc_lock_kmem;
  53 struct kmem_cache *osc_object_kmem;
  54 struct kmem_cache *osc_thread_kmem;
  55 struct kmem_cache *osc_session_kmem;
  56 struct kmem_cache *osc_req_kmem;
  57 struct kmem_cache *osc_extent_kmem;
  58 struct kmem_cache *osc_quota_kmem;
  59
  60 struct lu_kmem_descr osc_caches[] = {
  61         {
  62                 .ckd_cache = &osc_lock_kmem,
  63                 .ckd_name  = "osc_lock_kmem",
  64                 .ckd_size  = sizeof(struct osc_lock)
  65         },
  66         {
  67                 .ckd_cache = &osc_object_kmem,
  68                 .ckd_name  = "osc_object_kmem",
  69                 .ckd_size  = sizeof(struct osc_object)
  70         },
  71         {
  72                 .ckd_cache = &osc_thread_kmem,
  73                 .ckd_name  = "osc_thread_kmem",
  74                 .ckd_size  = sizeof(struct osc_thread_info)
  75         },
  76         {
  77                 .ckd_cache = &osc_session_kmem,
  78                 .ckd_name  = "osc_session_kmem",
  79                 .ckd_size  = sizeof(struct osc_session)
  80         },
  81         {
  82                 .ckd_cache = &osc_req_kmem,
  83                 .ckd_name  = "osc_req_kmem",
  84                 .ckd_size  = sizeof(struct osc_req)
  85         },
  86         {
  87                 .ckd_cache = &osc_extent_kmem,
  88                 .ckd_name  = "osc_extent_kmem",
  89                 .ckd_size  = sizeof(struct osc_extent)
  90         },
  91         {
  92                 .ckd_cache = &osc_quota_kmem,
  93                 .ckd_name  = "osc_quota_kmem",
  94                 .ckd_size  = sizeof(struct osc_quota_info)
  95         },
  96         {
  97                 .ckd_cache = NULL
  98         }
  99 };
 100
 101 struct lock_class_key osc_ast_guard_class;
 102
 103 /*****************************************************************************
 104  *
 105  * Type conversions.
 106  *
 107  */
 108
 109 static struct lu_device *osc2lu_dev(struct osc_device *osc)
 110 {
 111         return &osc->od_cl.cd_lu_dev;
 112 }
 113
 114 /*****************************************************************************
 115  *
 116  * Osc device and device type functions.
 117  *
 118  */
 119
 120 static void *osc_key_init(const struct lu_context *ctx,
 121                           struct lu_context_key *key)
 122 {
 123         struct osc_thread_info *info;
 124
 125         OBD_SLAB_ALLOC_PTR_GFP(info, osc_thread_kmem, GFP_NOFS);
 126         if (info == NULL)
 127                 info = ERR_PTR(-ENOMEM);
 128         return info;
 129 }
 130
 131 static void osc_key_fini(const struct lu_context *ctx,
 132                          struct lu_context_key *key, void *data)
 133 {
 134         struct osc_thread_info *info = data;
 135
 136         OBD_SLAB_FREE_PTR(info, osc_thread_kmem);
 137 }
 138
 139 struct lu_context_key osc_key = {
 140         .lct_tags = LCT_CL_THREAD,
 141         .lct_init = osc_key_init,
 142         .lct_fini = osc_key_fini
 143 };
 144
 145 static void *osc_session_init(const struct lu_context *ctx,
 146                               struct lu_context_key *key)
 147 {
 148         struct osc_session *info;
 149
 150         OBD_SLAB_ALLOC_PTR_GFP(info, osc_session_kmem, GFP_NOFS);
 151         if (info == NULL)
 152                 info = ERR_PTR(-ENOMEM);
 153         return info;
 154 }
 155
 156 static void osc_session_fini(const struct lu_context *ctx,
 157                              struct lu_context_key *key, void *data)
 158 {
 159         struct osc_session *info = data;
 160
 161         OBD_SLAB_FREE_PTR(info, osc_session_kmem);
 162 }
 163
 164 struct lu_context_key osc_session_key = {
 165         .lct_tags = LCT_SESSION,
 166         .lct_init = osc_session_init,
 167         .lct_fini = osc_session_fini
 168 };
 169
 170 /* type constructor/destructor: osc_type_{init,fini,start,stop}(). */
 171 LU_TYPE_INIT_FINI(osc, &osc_key, &osc_session_key);
 172
 173 static int osc_cl_process_config(const struct lu_env *env,
 174                                  struct lu_device *d, struct lustre_cfg *cfg)
 175 {
 176         return osc_process_config_base(d->ld_obd, cfg);
 177 }
 178
 179 static const struct lu_device_operations osc_lu_ops = {
 180         .ldo_object_alloc      = osc_object_alloc,
 181         .ldo_process_config    = osc_cl_process_config,
 182         .ldo_recovery_complete = NULL
 183 };
 184
 185 static const struct cl_device_operations osc_cl_ops = {
 186         .cdo_req_init = osc_req_init
 187 };
 188
 189 static int osc_device_init(const struct lu_env *env, struct lu_device *d,
 190                            const char *name, struct lu_device *next)
 191 {
 192         return 0;
 193 }
 194
 195 static struct lu_device *osc_device_fini(const struct lu_env *env,
 196                                          struct lu_device *d)
 197 {
 198         return NULL;
 199 }
 200
 201 static struct lu_device *osc_device_free(const struct lu_env *env,
 202                                          struct lu_device *d)
 203 {
 204         struct osc_device *od = lu2osc_dev(d);
 205
 206         cl_device_fini(lu2cl_dev(d));
 207         kfree(od);
 208         return NULL;
 209 }
 210
 211 static struct lu_device *osc_device_alloc(const struct lu_env *env,
 212                                           struct lu_device_type *t,
 213                                           struct lustre_cfg *cfg)
 214 {
 215         struct lu_device *d;
 216         struct osc_device *od;
 217         struct obd_device *obd;
 218         int rc;
 219
 220         od = kzalloc(sizeof(*od), GFP_NOFS);
 221         if (!od)
 222                 return ERR_PTR(-ENOMEM);
 223
 224         cl_device_init(&od->od_cl, t);
 225         d = osc2lu_dev(od);
 226         d->ld_ops = &osc_lu_ops;
 227         od->od_cl.cd_ops = &osc_cl_ops;
 228
 229         /* Setup OSC OBD */
 230         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 231         LASSERT(obd != NULL);
 232         rc = osc_setup(obd, cfg);
 233         if (rc) {
 234                 osc_device_free(env, d);
 235                 return ERR_PTR(rc);
 236         }
 237         od->od_exp = obd->obd_self_export;
 238         return d;
 239 }
 240
 241 static const struct lu_device_type_operations osc_device_type_ops = {
 242         .ldto_init = osc_type_init,
 243         .ldto_fini = osc_type_fini,
 244
 245         .ldto_start = osc_type_start,
 246         .ldto_stop  = osc_type_stop,
 247
 248         .ldto_device_alloc = osc_device_alloc,
 249         .ldto_device_free  = osc_device_free,
 250
 251         .ldto_device_init = osc_device_init,
 252         .ldto_device_fini = osc_device_fini
 253 };
 254
 255 struct lu_device_type osc_device_type = {
 256         .ldt_tags = LU_DEVICE_CL,
 257         .ldt_name = LUSTRE_OSC_NAME,
 258         .ldt_ops = &osc_device_type_ops,
 259         .ldt_ctx_tags = LCT_CL_THREAD
 260 };
 261
 262 /** @} osc */