lustre/lmv/lmv_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.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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, Whamcloud, Inc.
  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 #define DEBUG_SUBSYSTEM S_LMV
  38 #ifdef __KERNEL__
  39 #include <linux/slab.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/pagemap.h>
  44 #include <asm/div64.h>
  45 #include <linux/seq_file.h>
  46 #else
  47 #include <liblustre.h>
  48 #endif
  49
  50 #include <obd_support.h>
  51 #include <lustre/lustre_idl.h>
  52 #include <lustre_lib.h>
  53 #include <lustre_net.h>
  54 #include <lustre_dlm.h>
  55 #include <obd_class.h>
  56 #include <lprocfs_status.h>
  57 #include "lmv_internal.h"
  58
  59 extern cfs_mem_cache_t *lmv_object_cache;
  60 extern cfs_atomic_t lmv_object_count;
  61
  62 static CFS_LIST_HEAD(obj_list);
  63 static DEFINE_SPINLOCK(obj_list_lock);
  64
  65 struct lmv_object *lmv_object_alloc(struct obd_device *obd,
  66                                     const struct lu_fid *fid,
  67                                     struct lmv_stripe_md *mea)
  68 {
  69         struct lmv_obd          *lmv = &obd->u.lmv;
  70         unsigned int             obj_size;
  71         struct lmv_object       *obj;
  72         int                      i;
  73
  74         LASSERT(mea->mea_magic == MEA_MAGIC_LAST_CHAR
  75                 || mea->mea_magic == MEA_MAGIC_ALL_CHARS
  76                 || mea->mea_magic == MEA_MAGIC_HASH_SEGMENT);
  77
  78         OBD_SLAB_ALLOC_PTR(obj, lmv_object_cache);
  79         if (!obj)
  80                 return NULL;
  81
  82         cfs_atomic_inc(&lmv_object_count);
  83
  84         obj->lo_fid = *fid;
  85         obj->lo_obd = obd;
  86         obj->lo_state = 0;
  87         obj->lo_hashtype = mea->mea_magic;
  88
  89         mutex_init(&obj->lo_guard);
  90         cfs_atomic_set(&obj->lo_count, 0);
  91         obj->lo_objcount = mea->mea_count;
  92
  93         obj_size = sizeof(struct lmv_stripe) *
  94                 lmv->desc.ld_tgt_count;
  95
  96         OBD_ALLOC_LARGE(obj->lo_stripes, obj_size);
  97         if (!obj->lo_stripes)
  98                 goto err_obj;
  99
 100         CDEBUG(D_INODE, "Allocate object for "DFID"\n",
 101                PFID(fid));
 102         for (i = 0; i < mea->mea_count; i++) {
 103                 int rc;
 104
 105                 CDEBUG(D_INODE, "Process subobject "DFID"\n",
 106                        PFID(&mea->mea_ids[i]));
 107                 obj->lo_stripes[i].ls_fid = mea->mea_ids[i];
 108                 LASSERT(fid_is_sane(&obj->lo_stripes[i].ls_fid));
 109
 110                 /*
 111                  * Cache slave mds number to use it in all cases it is needed
 112                  * instead of constant lookup.
 113                  */
 114                 rc = lmv_fld_lookup(lmv, &obj->lo_stripes[i].ls_fid,
 115                                     &obj->lo_stripes[i].ls_mds);
 116                 if (rc)
 117                         goto err_obj;
 118         }
 119
 120         return obj;
 121 err_obj:
 122         OBD_FREE(obj, sizeof(*obj));
 123         return NULL;
 124 }
 125
 126 void lmv_object_free(struct lmv_object *obj)
 127 {
 128         struct lmv_obd          *lmv = &obj->lo_obd->u.lmv;
 129         unsigned int             obj_size;
 130
 131         LASSERT(!cfs_atomic_read(&obj->lo_count));
 132
 133         obj_size = sizeof(struct lmv_stripe) *
 134                 lmv->desc.ld_tgt_count;
 135
 136         OBD_FREE_LARGE(obj->lo_stripes, obj_size);
 137         OBD_SLAB_FREE(obj, lmv_object_cache, sizeof(*obj));
 138         cfs_atomic_dec(&lmv_object_count);
 139 }
 140
 141 static void __lmv_object_add(struct lmv_object *obj)
 142 {
 143         cfs_atomic_inc(&obj->lo_count);
 144         cfs_list_add(&obj->lo_list, &obj_list);
 145 }
 146
 147 void lmv_object_add(struct lmv_object *obj)
 148 {
 149         spin_lock(&obj_list_lock);
 150         __lmv_object_add(obj);
 151         spin_unlock(&obj_list_lock);
 152 }
 153
 154 static void __lmv_object_del(struct lmv_object *obj)
 155 {
 156         cfs_list_del(&obj->lo_list);
 157         lmv_object_free(obj);
 158 }
 159
 160 void lmv_object_del(struct lmv_object *obj)
 161 {
 162         spin_lock(&obj_list_lock);
 163         __lmv_object_del(obj);
 164         spin_unlock(&obj_list_lock);
 165 }
 166
 167 static struct lmv_object *__lmv_object_get(struct lmv_object *obj)
 168 {
 169         LASSERT(obj != NULL);
 170         cfs_atomic_inc(&obj->lo_count);
 171         return obj;
 172 }
 173
 174 struct lmv_object *lmv_object_get(struct lmv_object *obj)
 175 {
 176         spin_lock(&obj_list_lock);
 177         __lmv_object_get(obj);
 178         spin_unlock(&obj_list_lock);
 179         return obj;
 180 }
 181
 182 static void __lmv_object_put(struct lmv_object *obj)
 183 {
 184         LASSERT(obj);
 185
 186         if (cfs_atomic_dec_and_test(&obj->lo_count)) {
 187                 CDEBUG(D_INODE, "Last reference to "DFID" - "
 188                        "destroying\n", PFID(&obj->lo_fid));
 189                 __lmv_object_del(obj);
 190         }
 191 }
 192
 193 void lmv_object_put(struct lmv_object *obj)
 194 {
 195         spin_lock(&obj_list_lock);
 196         __lmv_object_put(obj);
 197         spin_unlock(&obj_list_lock);
 198 }
 199
 200 void lmv_object_put_unlock(struct lmv_object *obj)
 201 {
 202         lmv_object_unlock(obj);
 203         lmv_object_put(obj);
 204 }
 205
 206 static struct lmv_object *__lmv_object_find(struct obd_device *obd, const struct lu_fid *fid)
 207 {
 208         struct lmv_object       *obj;
 209         cfs_list_t              *cur;
 210
 211         cfs_list_for_each(cur, &obj_list) {
 212                 obj = cfs_list_entry(cur, struct lmv_object, lo_list);
 213
 214                 /*
 215                  * Check if object is in destroying phase. If so - skip
 216                  * it.
 217                  */
 218                 if (obj->lo_state & O_FREEING)
 219                         continue;
 220
 221                 /*
 222                  * We should make sure, that we have found object belong to
 223                  * passed obd. It is possible that, object manager will have two
 224                  * objects with the same fid belong to different obds, if client
 225                  * and mds runs on the same host. May be it is good idea to have
 226                  * objects list associated with obd.
 227                  */
 228                 if (obj->lo_obd != obd)
 229                         continue;
 230
 231                 /*
 232                  * Check if this is what we're looking for.
 233                  */
 234                 if (lu_fid_eq(&obj->lo_fid, fid))
 235                         return __lmv_object_get(obj);
 236         }
 237
 238         return NULL;
 239 }
 240
 241 struct lmv_object *lmv_object_find(struct obd_device *obd,
 242                                    const struct lu_fid *fid)
 243 {
 244         struct lmv_obd          *lmv = &obd->u.lmv;
 245         struct lmv_object       *obj = NULL;
 246         ENTRY;
 247
 248         /* For single MDT case, lmv_object list is always empty. */
 249         if (lmv->desc.ld_tgt_count > 1) {
 250                 spin_lock(&obj_list_lock);
 251                 obj = __lmv_object_find(obd, fid);
 252                 spin_unlock(&obj_list_lock);
 253         }
 254
 255         RETURN(obj);
 256 }
 257
 258 struct lmv_object *lmv_object_find_lock(struct obd_device *obd,
 259                                         const struct lu_fid *fid)
 260 {
 261         struct lmv_object       *obj;
 262         ENTRY;
 263
 264         obj = lmv_object_find(obd, fid);
 265         if (obj)
 266                 lmv_object_lock(obj);
 267
 268         RETURN(obj);
 269 }
 270
 271 static struct lmv_object *__lmv_object_create(struct obd_device *obd,
 272                                               const struct lu_fid *fid,
 273                                               struct lmv_stripe_md *mea)
 274 {
 275         struct lmv_object       *new;
 276         struct lmv_object       *obj;
 277         ENTRY;
 278
 279         obj = lmv_object_find(obd, fid);
 280         if (obj)
 281                 RETURN(obj);
 282
 283         new = lmv_object_alloc(obd, fid, mea);
 284         if (!new)
 285                 RETURN(NULL);
 286
 287         /*
 288          * Check if someone created it already while we were dealing with
 289          * allocating @obj.
 290          */
 291         spin_lock(&obj_list_lock);
 292         obj = __lmv_object_find(obd, fid);
 293         if (obj) {
 294                 /*
 295                  * Someone created it already - put @obj and getting out.
 296                  */
 297                 spin_unlock(&obj_list_lock);
 298                 lmv_object_free(new);
 299                 RETURN(obj);
 300         }
 301
 302         __lmv_object_add(new);
 303         __lmv_object_get(new);
 304
 305         spin_unlock(&obj_list_lock);
 306
 307         CDEBUG(D_INODE, "New obj in lmv cache: "DFID"\n", 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         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         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         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         spin_unlock(&obj_list_lock);
 450         EXIT;
 451 }