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  2008 Sun Microsystems, Inc. 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 <lustre/lustre_idl.h>
  54 #include <obd_support.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 atomic_t lmv_object_count;
  64
  65 static CFS_LIST_HEAD(obj_list);
  66 static spinlock_t obj_list_lock = 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         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         init_MUTEX(&obj->lo_guard);
  93         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(obj->lo_stripes, obj_size);
 100         if (!obj->lo_stripes)
 101                 goto err_obj;
 102
 103         memset(obj->lo_stripes, 0, obj_size);
 104
 105         CDEBUG(D_INODE, "Allocate object for "DFID"\n",
 106                PFID(fid));
 107         for (i = 0; i < mea->mea_count; i++) {
 108                 int rc;
 109
 110                 CDEBUG(D_INODE, "Process subobject "DFID"\n",
 111                        PFID(&mea->mea_ids[i]));
 112                 obj->lo_stripes[i].ls_fid = mea->mea_ids[i];
 113                 LASSERT(fid_is_sane(&obj->lo_stripes[i].ls_fid));
 114
 115                 /*
 116                  * Cache slave mds number to use it in all cases it is needed
 117                  * instead of constant lookup.
 118                  */
 119                 rc = lmv_fld_lookup(lmv, &obj->lo_stripes[i].ls_fid,
 120                                     &obj->lo_stripes[i].ls_mds);
 121                 if (rc)
 122                         goto err_obj;
 123         }
 124
 125         return obj;
 126 err_obj:
 127         OBD_FREE(obj, sizeof(*obj));
 128         return NULL;
 129 }
 130
 131 void lmv_object_free(struct lmv_object *obj)
 132 {
 133         struct lmv_obd          *lmv = &obj->lo_obd->u.lmv;
 134         unsigned int             obj_size;
 135
 136         LASSERT(!atomic_read(&obj->lo_count));
 137
 138         obj_size = sizeof(struct lmv_stripe) *
 139                 lmv->desc.ld_tgt_count;
 140
 141         OBD_FREE(obj->lo_stripes, obj_size);
 142         OBD_SLAB_FREE(obj, lmv_object_cache, sizeof(*obj));
 143         atomic_dec(&lmv_object_count);
 144 }
 145
 146 static void __lmv_object_add(struct lmv_object *obj)
 147 {
 148         atomic_inc(&obj->lo_count);
 149         list_add(&obj->lo_list, &obj_list);
 150 }
 151
 152 void lmv_object_add(struct lmv_object *obj)
 153 {
 154         spin_lock(&obj_list_lock);
 155         __lmv_object_add(obj);
 156         spin_unlock(&obj_list_lock);
 157 }
 158
 159 static void __lmv_object_del(struct lmv_object *obj)
 160 {
 161         list_del(&obj->lo_list);
 162         lmv_object_free(obj);
 163 }
 164
 165 void lmv_object_del(struct lmv_object *obj)
 166 {
 167         spin_lock(&obj_list_lock);
 168         __lmv_object_del(obj);
 169         spin_unlock(&obj_list_lock);
 170 }
 171
 172 static struct lmv_object *__lmv_object_get(struct lmv_object *obj)
 173 {
 174         LASSERT(obj != NULL);
 175         atomic_inc(&obj->lo_count);
 176         return obj;
 177 }
 178
 179 struct lmv_object *lmv_object_get(struct lmv_object *obj)
 180 {
 181         spin_lock(&obj_list_lock);
 182         __lmv_object_get(obj);
 183         spin_unlock(&obj_list_lock);
 184         return obj;
 185 }
 186
 187 static void __lmv_object_put(struct lmv_object *obj)
 188 {
 189         LASSERT(obj);
 190
 191         if (atomic_dec_and_test(&obj->lo_count)) {
 192                 CDEBUG(D_INODE, "Last reference to "DFID" - "
 193                        "destroying\n", PFID(&obj->lo_fid));
 194                 __lmv_object_del(obj);
 195         }
 196 }
 197
 198 void lmv_object_put(struct lmv_object *obj)
 199 {
 200         spin_lock(&obj_list_lock);
 201         __lmv_object_put(obj);
 202         spin_unlock(&obj_list_lock);
 203 }
 204
 205 void lmv_object_put_unlock(struct lmv_object *obj)
 206 {
 207         lmv_object_unlock(obj);
 208         lmv_object_put(obj);
 209 }
 210
 211 static struct lmv_object *__lmv_object_find(struct obd_device *obd, const struct lu_fid *fid)
 212 {
 213         struct lmv_object       *obj;
 214         struct list_head        *cur;
 215
 216         list_for_each(cur, &obj_list) {
 217                 obj = list_entry(cur, struct lmv_object, lo_list);
 218
 219                 /*
 220                  * Check if object is in destroying phase. If so - skip
 221                  * it.
 222                  */
 223                 if (obj->lo_state & O_FREEING)
 224                         continue;
 225
 226                 /*
 227                  * We should make sure, that we have found object belong to
 228                  * passed obd. It is possible that, object manager will have two
 229                  * objects with the same fid belong to different obds, if client
 230                  * and mds runs on the same host. May be it is good idea to have
 231                  * objects list associated with obd.
 232                  */
 233                 if (obj->lo_obd != obd)
 234                         continue;
 235
 236                 /*
 237                  * Check if this is what we're looking for.
 238                  */
 239                 if (lu_fid_eq(&obj->lo_fid, fid))
 240                         return __lmv_object_get(obj);
 241         }
 242
 243         return NULL;
 244 }
 245
 246 struct lmv_object *lmv_object_find(struct obd_device *obd,
 247                                    const struct lu_fid *fid)
 248 {
 249         struct lmv_object       *obj;
 250         ENTRY;
 251
 252         spin_lock(&obj_list_lock);
 253         obj = __lmv_object_find(obd, fid);
 254         spin_unlock(&obj_list_lock);
 255
 256         RETURN(obj);
 257 }
 258
 259 struct lmv_object *lmv_object_find_lock(struct obd_device *obd,
 260                                         const struct lu_fid *fid)
 261 {
 262         struct lmv_object       *obj;
 263         ENTRY;
 264
 265         obj = lmv_object_find(obd, fid);
 266         if (obj)
 267                 lmv_object_lock(obj);
 268
 269         RETURN(obj);
 270 }
 271
 272 static struct lmv_object *__lmv_object_create(struct obd_device *obd,
 273                                               const struct lu_fid *fid,
 274                                               struct lmv_stripe_md *mea)
 275 {
 276         struct lmv_object       *new;
 277         struct lmv_object       *obj;
 278         ENTRY;
 279
 280         obj = lmv_object_find(obd, fid);
 281         if (obj)
 282                 RETURN(obj);
 283
 284         new = lmv_object_alloc(obd, fid, mea);
 285         if (!new)
 286                 RETURN(NULL);
 287
 288         /*
 289          * Check if someone created it already while we were dealing with
 290          * allocating @obj.
 291          */
 292         spin_lock(&obj_list_lock);
 293         obj = __lmv_object_find(obd, fid);
 294         if (obj) {
 295                 /*
 296                  * Someone created it already - put @obj and getting out.
 297                  */
 298                 spin_unlock(&obj_list_lock);
 299                 lmv_object_free(new);
 300                 RETURN(obj);
 301         }
 302
 303         __lmv_object_add(new);
 304         __lmv_object_get(new);
 305
 306         spin_unlock(&obj_list_lock);
 307
 308         CDEBUG(D_INODE, "New obj in lmv cache: "DFID"\n",
 309                PFID(fid));
 310
 311         RETURN(new);
 312 }
 313
 314 struct lmv_object *lmv_object_create(struct obd_export *exp,
 315                                      const struct lu_fid *fid,
 316                                      struct lmv_stripe_md *mea)
 317 {
 318         struct obd_device       *obd = exp->exp_obd;
 319         struct lmv_obd          *lmv = &obd->u.lmv;
 320         struct ptlrpc_request   *req = NULL;
 321         struct lmv_tgt_desc     *tgt;
 322         struct lmv_object       *obj;
 323         struct lustre_md         md;
 324         int                      mealen;
 325         int                      rc;
 326         ENTRY;
 327
 328         CDEBUG(D_INODE, "Get mea for "DFID" and create lmv obj\n",
 329                PFID(fid));
 330
 331         md.mea = NULL;
 332
 333         if (mea == NULL) {
 334                 __u64 valid;
 335
 336                 CDEBUG(D_INODE, "Mea isn't passed in, get it now\n");
 337                 mealen = lmv_get_easize(lmv);
 338
 339                 /*
 340                  * Time to update mea of parent fid.
 341                  */
 342                 md.mea = NULL;
 343                 valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA | OBD_MD_MEA;
 344
 345                 tgt = lmv_find_target(lmv, fid);
 346                 if (IS_ERR(tgt))
 347                         GOTO(cleanup, obj = (void *)tgt);
 348
 349                 rc = md_getattr(tgt->ltd_exp, fid, NULL, valid, mealen, &req);
 350                 if (rc) {
 351                         CERROR("md_getattr() failed, error %d\n", rc);
 352                         GOTO(cleanup, obj = ERR_PTR(rc));
 353                 }
 354
 355                 rc = md_get_lustre_md(exp, req, NULL, exp, &md);
 356                 if (rc) {
 357                         CERROR("md_get_lustre_md() failed, error %d\n", rc);
 358                         GOTO(cleanup, obj = ERR_PTR(rc));
 359                 }
 360
 361                 if (md.mea == NULL)
 362                         GOTO(cleanup, obj = ERR_PTR(-ENODATA));
 363
 364                 mea = md.mea;
 365         }
 366
 367         /*
 368          * Got mea, now create obj for it.
 369          */
 370         obj = __lmv_object_create(obd, fid, mea);
 371         if (!obj) {
 372                 CERROR("Can't create new object "DFID"\n",
 373                        PFID(fid));
 374                 GOTO(cleanup, obj = ERR_PTR(-ENOMEM));
 375         }
 376
 377         if (md.mea != NULL)
 378                 obd_free_memmd(exp, (void *)&md.mea);
 379
 380         EXIT;
 381 cleanup:
 382         if (req)
 383                 ptlrpc_req_finished(req);
 384         return obj;
 385 }
 386
 387 int lmv_object_delete(struct obd_export *exp, const struct lu_fid *fid)
 388 {
 389         struct obd_device       *obd = exp->exp_obd;
 390         struct lmv_object       *obj;
 391         int                      rc = 0;
 392         ENTRY;
 393
 394         spin_lock(&obj_list_lock);
 395         obj = __lmv_object_find(obd, fid);
 396         if (obj) {
 397                 obj->lo_state |= O_FREEING;
 398                 __lmv_object_put(obj);
 399                 __lmv_object_put(obj);
 400                 rc = 1;
 401         }
 402         spin_unlock(&obj_list_lock);
 403         RETURN(rc);
 404 }
 405
 406 int lmv_object_setup(struct obd_device *obd)
 407 {
 408         ENTRY;
 409         LASSERT(obd != NULL);
 410
 411         CDEBUG(D_INFO, "LMV object manager setup (%s)\n",
 412                obd->obd_uuid.uuid);
 413
 414         RETURN(0);
 415 }
 416
 417 void lmv_object_cleanup(struct obd_device *obd)
 418 {
 419         struct list_head        *cur;
 420         struct list_head        *tmp;
 421         struct lmv_object       *obj;
 422         ENTRY;
 423
 424         CDEBUG(D_INFO, "LMV object manager cleanup (%s)\n",
 425                obd->obd_uuid.uuid);
 426
 427         spin_lock(&obj_list_lock);
 428         list_for_each_safe(cur, tmp, &obj_list) {
 429                 obj = list_entry(cur, struct lmv_object, lo_list);
 430
 431                 if (obj->lo_obd != obd)
 432                         continue;
 433
 434                 obj->lo_state |= O_FREEING;
 435                 if (atomic_read(&obj->lo_count) > 1) {
 436                         CERROR("Object "DFID" has count (%d)\n",
 437                                PFID(&obj->lo_fid), atomic_read(&obj->lo_count));
 438                 }
 439                 __lmv_object_put(obj);
 440         }
 441         spin_unlock(&obj_list_lock);
 442         EXIT;
 443 }