lustre/lmv/lmv_object.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LMV
  41 #ifdef __KERNEL__
  42 #include <linux/slab.h>
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45 #include <linux/slab.h>
  46 #include <linux/pagemap.h>
  47 #include <asm/div64.h>
  48 #include <linux/seq_file.h>
  49 #else
  50 #include <liblustre.h>
  51 #endif
  52
  53 #include <obd_support.h>
  54 #include <lustre/lustre_idl.h>
  55 #include <lustre_lib.h>
  56 #include <lustre_net.h>
  57 #include <lustre_dlm.h>
  58 #include <obd_class.h>
  59 #include <lprocfs_status.h>
  60 #include "lmv_internal.h"
  61
  62 extern cfs_mem_cache_t *lmv_object_cache;
  63 extern cfs_atomic_t lmv_object_count;
  64
  65 static CFS_LIST_HEAD(obj_list);
  66 static cfs_spinlock_t obj_list_lock = CFS_SPIN_LOCK_UNLOCKED;
  67
  68 struct lmv_object *lmv_object_alloc(struct obd_device *obd,
  69                                     const struct lu_fid *fid,
  70                                     struct lmv_stripe_md *mea)
  71 {
  72         struct lmv_obd          *lmv = &obd->u.lmv;
  73         unsigned int             obj_size;
  74         struct lmv_object       *obj;
  75         int                      i;
  76
  77         LASSERT(mea->mea_magic == MEA_MAGIC_LAST_CHAR
  78                 || mea->mea_magic == MEA_MAGIC_ALL_CHARS
  79                 || mea->mea_magic == MEA_MAGIC_HASH_SEGMENT);
  80
  81         OBD_SLAB_ALLOC_PTR(obj, lmv_object_cache);
  82         if (!obj)
  83                 return NULL;
  84
  85         cfs_atomic_inc(&lmv_object_count);
  86
  87         obj->lo_fid = *fid;
  88         obj->lo_obd = obd;
  89         obj->lo_state = 0;
  90         obj->lo_hashtype = mea->mea_magic;
  91
  92         cfs_init_mutex(&obj->lo_guard);
  93         cfs_atomic_set(&obj->lo_count, 0);
  94         obj->lo_objcount = mea->mea_count;
  95
  96         obj_size = sizeof(struct lmv_stripe) *
  97                 lmv->desc.ld_tgt_count;
  98
  99         OBD_ALLOC_LARGE(obj->lo_stripes, obj_size);
 100         if (!obj->lo_stripes)
 101                 goto err_obj;
 102
 103         CDEBUG(D_INODE, "Allocate object for "DFID"\n",
 104                PFID(fid));
 105         for (i = 0; i < mea->mea_count; i++) {
 106                 int rc;
 107
 108                 CDEBUG(D_INODE, "Process subobject "DFID"\n",
 109                        PFID(&mea->mea_ids[i]));
 110                 obj->lo_stripes[i].ls_fid = mea->mea_ids[i];
 111                 LASSERT(fid_is_sane(&obj->lo_stripes[i].ls_fid));
 112
 113                 /*
 114                  * Cache slave mds number to use it in all cases it is needed
 115                  * instead of constant lookup.
 116                  */
 117                 rc = lmv_fld_lookup(lmv, &obj->lo_stripes[i].ls_fid,
 118                                     &obj->lo_stripes[i].ls_mds);
 119                 if (rc)
 120                         goto err_obj;
 121         }
 122
 123         return obj;
 124 err_obj:
 125         OBD_FREE(obj, sizeof(*obj));
 126         return NULL;
 127 }
 128
 129 void lmv_object_free(struct lmv_object *obj)
 130 {
 131         struct lmv_obd          *lmv = &obj->lo_obd->u.lmv;
 132         unsigned int             obj_size;
 133
 134         LASSERT(!cfs_atomic_read(&obj->lo_count));
 135
 136         obj_size = sizeof(struct lmv_stripe) *
 137                 lmv->desc.ld_tgt_count;
 138
 139         OBD_FREE_LARGE(obj->lo_stripes, obj_size);
 140         OBD_SLAB_FREE(obj, lmv_object_cache, sizeof(*obj));
 141         cfs_atomic_dec(&lmv_object_count);
 142 }
 143
 144 static void __lmv_object_add(struct lmv_object *obj)
 145 {
 146         cfs_atomic_inc(&obj->lo_count);
 147         cfs_list_add(&obj->lo_list, &obj_list);
 148 }
 149
 150 void lmv_object_add(struct lmv_object *obj)
 151 {
 152         cfs_spin_lock(&obj_list_lock);
 153         __lmv_object_add(obj);
 154         cfs_spin_unlock(&obj_list_lock);
 155 }
 156
 157 static void __lmv_object_del(struct lmv_object *obj)
 158 {
 159         cfs_list_del(&obj->lo_list);
 160         lmv_object_free(obj);
 161 }
 162
 163 void lmv_object_del(struct lmv_object *obj)
 164 {
 165         cfs_spin_lock(&obj_list_lock);
 166         __lmv_object_del(obj);
 167         cfs_spin_unlock(&obj_list_lock);
 168 }
 169
 170 static struct lmv_object *__lmv_object_get(struct lmv_object *obj)
 171 {
 172         LASSERT(obj != NULL);
 173         cfs_atomic_inc(&obj->lo_count);
 174         return obj;
 175 }
 176
 177 struct lmv_object *lmv_object_get(struct lmv_object *obj)
 178 {
 179         cfs_spin_lock(&obj_list_lock);
 180         __lmv_object_get(obj);
 181         cfs_spin_unlock(&obj_list_lock);
 182         return obj;
 183 }
 184
 185 static void __lmv_object_put(struct lmv_object *obj)
 186 {
 187         LASSERT(obj);
 188
 189         if (cfs_atomic_dec_and_test(&obj->lo_count)) {
 190                 CDEBUG(D_INODE, "Last reference to "DFID" - "
 191                        "destroying\n", PFID(&obj->lo_fid));
 192                 __lmv_object_del(obj);
 193         }
 194 }
 195
 196 void lmv_object_put(struct lmv_object *obj)
 197 {
 198         cfs_spin_lock(&obj_list_lock);
 199         __lmv_object_put(obj);
 200         cfs_spin_unlock(&obj_list_lock);
 201 }
 202
 203 void lmv_object_put_unlock(struct lmv_object *obj)
 204 {
 205         lmv_object_unlock(obj);
 206         lmv_object_put(obj);
 207 }
 208
 209 static struct lmv_object *__lmv_object_find(struct obd_device *obd, const struct lu_fid *fid)
 210 {
 211         struct lmv_object       *obj;
 212         cfs_list_t              *cur;
 213
 214         cfs_list_for_each(cur, &obj_list) {
 215                 obj = cfs_list_entry(cur, struct lmv_object, lo_list);
 216
 217                 /*
 218                  * Check if object is in destroying phase. If so - skip
 219                  * it.
 220                  */
 221                 if (obj->lo_state & O_FREEING)
 222                         continue;
 223
 224                 /*
 225                  * We should make sure, that we have found object belong to
 226                  * passed obd. It is possible that, object manager will have two
 227                  * objects with the same fid belong to different obds, if client
 228                  * and mds runs on the same host. May be it is good idea to have
 229                  * objects list associated with obd.
 230                  */
 231                 if (obj->lo_obd != obd)
 232                         continue;
 233
 234                 /*
 235                  * Check if this is what we're looking for.
 236                  */
 237                 if (lu_fid_eq(&obj->lo_fid, fid))
 238                         return __lmv_object_get(obj);
 239         }
 240
 241         return NULL;
 242 }
 243
 244 struct lmv_object *lmv_object_find(struct obd_device *obd,
 245                                    const struct lu_fid *fid)
 246 {
 247         struct lmv_object       *obj;
 248         ENTRY;
 249
 250         cfs_spin_lock(&obj_list_lock);
 251         obj = __lmv_object_find(obd, fid);
 252         cfs_spin_unlock(&obj_list_lock);
 253
 254         RETURN(obj);
 255 }
 256
 257 struct lmv_object *lmv_object_find_lock(struct obd_device *obd,
 258                                         const struct lu_fid *fid)
 259 {
 260         struct lmv_object       *obj;
 261         ENTRY;
 262
 263         obj = lmv_object_find(obd, fid);
 264         if (obj)
 265                 lmv_object_lock(obj);
 266
 267         RETURN(obj);
 268 }
 269
 270 static struct lmv_object *__lmv_object_create(struct obd_device *obd,
 271                                               const struct lu_fid *fid,
 272                                               struct lmv_stripe_md *mea)
 273 {
 274         struct lmv_object       *new;
 275         struct lmv_object       *obj;
 276         ENTRY;
 277
 278         obj = lmv_object_find(obd, fid);
 279         if (obj)
 280                 RETURN(obj);
 281
 282         new = lmv_object_alloc(obd, fid, mea);
 283         if (!new)
 284                 RETURN(NULL);
 285
 286         /*
 287          * Check if someone created it already while we were dealing with
 288          * allocating @obj.
 289          */
 290         cfs_spin_lock(&obj_list_lock);
 291         obj = __lmv_object_find(obd, fid);
 292         if (obj) {
 293                 /*
 294                  * Someone created it already - put @obj and getting out.
 295                  */
 296                 cfs_spin_unlock(&obj_list_lock);
 297                 lmv_object_free(new);
 298                 RETURN(obj);
 299         }
 300
 301         __lmv_object_add(new);
 302         __lmv_object_get(new);
 303
 304         cfs_spin_unlock(&obj_list_lock);
 305
 306         CDEBUG(D_INODE, "New obj in lmv cache: "DFID"\n",
 307                PFID(fid));
 308
 309         RETURN(new);
 310 }
 311
 312 struct lmv_object *lmv_object_create(struct obd_export *exp,
 313                                      const struct lu_fid *fid,
 314                                      struct lmv_stripe_md *mea)
 315 {
 316         struct obd_device       *obd = exp->exp_obd;
 317         struct lmv_obd          *lmv = &obd->u.lmv;
 318         struct ptlrpc_request   *req = NULL;
 319         struct lmv_tgt_desc     *tgt;
 320         struct lmv_object       *obj;
 321         struct lustre_md         md;
 322         int                      mealen;
 323         int                      rc;
 324         ENTRY;
 325
 326         CDEBUG(D_INODE, "Get mea for "DFID" and create lmv obj\n",
 327                PFID(fid));
 328
 329         md.mea = NULL;
 330
 331         if (mea == NULL) {
 332                 struct md_op_data *op_data;
 333                 __u64 valid;
 334
 335                 CDEBUG(D_INODE, "Mea isn't passed in, get it now\n");
 336                 mealen = lmv_get_easize(lmv);
 337
 338                 /*
 339                  * Time to update mea of parent fid.
 340                  */
 341                 md.mea = NULL;
 342                 valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA | OBD_MD_MEA;
 343
 344                 tgt = lmv_find_target(lmv, fid);
 345                 if (IS_ERR(tgt))
 346                         GOTO(cleanup, obj = (void *)tgt);
 347
 348                 OBD_ALLOC_PTR(op_data);
 349                 if (op_data == NULL)
 350                         GOTO(cleanup, obj = ERR_PTR(-ENOMEM));
 351
 352                 op_data->op_fid1 = *fid;
 353                 op_data->op_mode = mealen;
 354                 op_data->op_valid = valid;
 355                 rc = md_getattr(tgt->ltd_exp, op_data, &req);
 356                 OBD_FREE_PTR(op_data);
 357                 if (rc) {
 358                         CERROR("md_getattr() failed, error %d\n", rc);
 359                         GOTO(cleanup, obj = ERR_PTR(rc));
 360                 }
 361
 362                 rc = md_get_lustre_md(exp, req, NULL, exp, &md);
 363                 if (rc) {
 364                         CERROR("md_get_lustre_md() failed, error %d\n", rc);
 365                         GOTO(cleanup, obj = ERR_PTR(rc));
 366                 }
 367
 368                 if (md.mea == NULL)
 369                         GOTO(cleanup, obj = ERR_PTR(-ENODATA));
 370
 371                 mea = md.mea;
 372         }
 373
 374         /*
 375          * Got mea, now create obj for it.
 376          */
 377         obj = __lmv_object_create(obd, fid, mea);
 378         if (!obj) {
 379                 CERROR("Can't create new object "DFID"\n",
 380                        PFID(fid));
 381                 GOTO(cleanup, obj = ERR_PTR(-ENOMEM));
 382         }
 383
 384         if (md.mea != NULL)
 385                 obd_free_memmd(exp, (void *)&md.mea);
 386
 387         EXIT;
 388 cleanup:
 389         if (req)
 390                 ptlrpc_req_finished(req);
 391         return obj;
 392 }
 393
 394 int lmv_object_delete(struct obd_export *exp, const struct lu_fid *fid)
 395 {
 396         struct obd_device       *obd = exp->exp_obd;
 397         struct lmv_object       *obj;
 398         int                      rc = 0;
 399         ENTRY;
 400
 401         cfs_spin_lock(&obj_list_lock);
 402         obj = __lmv_object_find(obd, fid);
 403         if (obj) {
 404                 obj->lo_state |= O_FREEING;
 405                 __lmv_object_put(obj);
 406                 __lmv_object_put(obj);
 407                 rc = 1;
 408         }
 409         cfs_spin_unlock(&obj_list_lock);
 410         RETURN(rc);
 411 }
 412
 413 int lmv_object_setup(struct obd_device *obd)
 414 {
 415         ENTRY;
 416         LASSERT(obd != NULL);
 417
 418         CDEBUG(D_INFO, "LMV object manager setup (%s)\n",
 419                obd->obd_uuid.uuid);
 420
 421         RETURN(0);
 422 }
 423
 424 void lmv_object_cleanup(struct obd_device *obd)
 425 {
 426         cfs_list_t              *cur;
 427         cfs_list_t              *tmp;
 428         struct lmv_object       *obj;
 429         ENTRY;
 430
 431         CDEBUG(D_INFO, "LMV object manager cleanup (%s)\n",
 432                obd->obd_uuid.uuid);
 433
 434         cfs_spin_lock(&obj_list_lock);
 435         cfs_list_for_each_safe(cur, tmp, &obj_list) {
 436                 obj = cfs_list_entry(cur, struct lmv_object, lo_list);
 437
 438                 if (obj->lo_obd != obd)
 439                         continue;
 440
 441                 obj->lo_state |= O_FREEING;
 442                 if (cfs_atomic_read(&obj->lo_count) > 1) {
 443                         CERROR("Object "DFID" has count (%d)\n",
 444                                PFID(&obj->lo_fid),
 445                                cfs_atomic_read(&obj->lo_count));
 446                 }
 447                 __lmv_object_put(obj);
 448         }
 449         cfs_spin_unlock(&obj_list_lock);
 450         EXIT;
 451 }