lustre/lod/lod_lov.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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright  2009 Sun Microsystems, Inc. All rights reserved
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, Intel Corporation.
  27  */
  28 /*
  29  * lustre/lod/lod_lov.c
  30  *
  31  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  32  */
  33
  34 #ifndef EXPORT_SYMTAB
  35 # define EXPORT_SYMTAB
  36 #endif
  37 #define DEBUG_SUBSYSTEM S_MDS
  38
  39 #include <obd_class.h>
  40 #include <obd_lov.h>
  41
  42 #include "lod_internal.h"
  43
  44 /*
  45  * Keep a refcount of lod->ltd_tgts usage to prevent racing with
  46  * addition/deletion. Any function that expects lov_tgts to remain stationary
  47  * must take a ref.
  48  *
  49  * \param lod - is the lod device from which we want to grab a reference
  50  */
  51 void lod_getref(struct lod_tgt_descs *ltd)
  52 {
  53         down_read(&ltd->ltd_rw_sem);
  54         mutex_lock(&ltd->ltd_mutex);
  55         ltd->ltd_refcount++;
  56         mutex_unlock(&ltd->ltd_mutex);
  57 }
  58
  59 /*
  60  * Companion of lod_getref() to release a reference on the lod table.
  61  * If this is the last reference and the ost entry was scheduled for deletion,
  62  * the descriptor is removed from the array.
  63  *
  64  * \param lod - is the lod device from which we release a reference
  65  */
  66 void lod_putref(struct lod_device *lod, struct lod_tgt_descs *ltd)
  67 {
  68         mutex_lock(&ltd->ltd_mutex);
  69         ltd->ltd_refcount--;
  70         if (ltd->ltd_refcount == 0 && ltd->ltd_death_row) {
  71                 struct lod_tgt_desc *tgt_desc, *tmp;
  72                 int                  idx;
  73                 CFS_LIST_HEAD(kill);
  74
  75                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
  76                        ltd->ltd_death_row);
  77
  78                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx) {
  79                         tgt_desc = LTD_TGT(ltd, idx);
  80                         LASSERT(tgt_desc);
  81
  82                         if (!tgt_desc->ltd_reap)
  83                                 continue;
  84
  85                         cfs_list_add(&tgt_desc->ltd_kill, &kill);
  86                         LTD_TGT(ltd, idx) = NULL;
  87                         /*FIXME: only support ost pool for now */
  88                         if (ltd == &lod->lod_ost_descs) {
  89                                 lod_ost_pool_remove(&lod->lod_pool_info, idx);
  90                                 if (tgt_desc->ltd_active)
  91                                         lod->lod_desc.ld_active_tgt_count--;
  92                         }
  93                         ltd->ltd_tgtnr--;
  94                         cfs_bitmap_clear(ltd->ltd_tgt_bitmap, idx);
  95                         ltd->ltd_death_row--;
  96                 }
  97                 mutex_unlock(&ltd->ltd_mutex);
  98                 up_read(&ltd->ltd_rw_sem);
  99
 100                 cfs_list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
 101                         int rc;
 102                         cfs_list_del(&tgt_desc->ltd_kill);
 103                         if (ltd == &lod->lod_ost_descs) {
 104                                 /* remove from QoS structures */
 105                                 rc = qos_del_tgt(lod, tgt_desc);
 106                                 if (rc)
 107                                         CERROR("%s: qos_del_tgt(%s) failed:"
 108                                                "rc = %d\n",
 109                                                lod2obd(lod)->obd_name,
 110                                               obd_uuid2str(&tgt_desc->ltd_uuid),
 111                                                rc);
 112                         }
 113                         rc = obd_disconnect(tgt_desc->ltd_exp);
 114                         if (rc)
 115                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
 116                                        lod2obd(lod)->obd_name,
 117                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
 118                         OBD_FREE_PTR(tgt_desc);
 119                 }
 120         } else {
 121                 mutex_unlock(&ltd->ltd_mutex);
 122                 up_read(&ltd->ltd_rw_sem);
 123         }
 124 }
 125
 126 static int ltd_bitmap_resize(struct lod_tgt_descs *ltd, __u32 newsize)
 127 {
 128         cfs_bitmap_t *new_bitmap, *old_bitmap = NULL;
 129         int           rc = 0;
 130         ENTRY;
 131
 132         /* grab write reference on the lod. Relocating the array requires
 133          * exclusive access */
 134
 135         down_write(&ltd->ltd_rw_sem);
 136         if (newsize <= ltd->ltd_tgts_size)
 137                 /* someone else has already resize the array */
 138                 GOTO(out, rc = 0);
 139
 140         /* allocate new bitmap */
 141         new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
 142         if (!new_bitmap)
 143                 GOTO(out, rc = -ENOMEM);
 144
 145         if (ltd->ltd_tgts_size > 0) {
 146                 /* the bitmap already exists, we need
 147                  * to copy data from old one */
 148                 cfs_bitmap_copy(new_bitmap, ltd->ltd_tgt_bitmap);
 149                 old_bitmap = ltd->ltd_tgt_bitmap;
 150         }
 151
 152         ltd->ltd_tgts_size  = newsize;
 153         ltd->ltd_tgt_bitmap = new_bitmap;
 154
 155         if (old_bitmap)
 156                 CFS_FREE_BITMAP(old_bitmap);
 157
 158         CDEBUG(D_CONFIG, "tgt size: %d\n", ltd->ltd_tgts_size);
 159
 160         EXIT;
 161 out:
 162         up_write(&ltd->ltd_rw_sem);
 163         return rc;
 164 }
 165
 166 /*
 167  * Connect LOD to a new OSP and add it to the device table.
 168  *
 169  * \param env - is the environment passed by the caller
 170  * \param lod - is the LOD device to be connected to the new OSP
 171  * \param osp - is the name of OSP device name about to be added
 172  * \param index - is the OSP index
 173  * \param gen - is the generation number
 174  * \param tgt_index - is the group of the OSP.
 175  * \param type - is the type of device (mdc or osc)
 176  */
 177 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
 178                    char *osp, unsigned index, unsigned gen, int tgt_index,
 179                    char *type, int active)
 180 {
 181         struct obd_connect_data *data = NULL;
 182         struct obd_export       *exp = NULL;
 183         struct obd_device       *obd;
 184         struct lu_device        *ldev;
 185         struct dt_device        *d;
 186         int                      rc;
 187         struct lod_tgt_desc     *tgt_desc;
 188         struct lod_tgt_descs    *ltd;
 189         struct obd_uuid         obd_uuid;
 190         ENTRY;
 191
 192         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
 193
 194         if (gen <= 0) {
 195                 CERROR("request to add OBD %s with invalid generation: %d\n",
 196                        osp, gen);
 197                 RETURN(-EINVAL);
 198         }
 199
 200         obd_str2uuid(&obd_uuid, osp);
 201
 202         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
 203                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 204         if (obd == NULL) {
 205                 CERROR("can't find %s device\n", osp);
 206                 RETURN(-EINVAL);
 207         }
 208
 209         OBD_ALLOC_PTR(data);
 210         if (data == NULL)
 211                 RETURN(-ENOMEM);
 212
 213         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
 214         data->ocd_version = LUSTRE_VERSION_CODE;
 215         data->ocd_index = index;
 216
 217         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 218                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 219                                            OBD_CONNECT_FULL20 |
 220                                            OBD_CONNECT_INDEX |
 221 #ifdef HAVE_LRU_RESIZE_SUPPORT
 222                                            OBD_CONNECT_LRU_RESIZE |
 223 #endif
 224                                            OBD_CONNECT_MDS |
 225                                            OBD_CONNECT_OSS_CAPA |
 226                                            OBD_CONNECT_REQPORTAL |
 227                                            OBD_CONNECT_SKIP_ORPHAN |
 228                                            OBD_CONNECT_FID |
 229                                            OBD_CONNECT_LVB_TYPE |
 230                                            OBD_CONNECT_VERSION |
 231                                            OBD_CONNECT_PINGLESS;
 232
 233                 data->ocd_group = tgt_index;
 234                 ltd = &lod->lod_ost_descs;
 235         } else {
 236                 struct obd_import *imp = obd->u.cli.cl_import;
 237
 238                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 239                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 240                                            OBD_CONNECT_MDS_CAPA |
 241                                            OBD_CONNECT_OSS_CAPA |
 242                                            OBD_CONNECT_IBITS |
 243                                            OBD_CONNECT_MDS_MDS |
 244                                            OBD_CONNECT_FID |
 245                                            OBD_CONNECT_AT |
 246                                            OBD_CONNECT_FULL20 |
 247                                            OBD_CONNECT_PINGLESS;
 248                 /* XXX set MDS-MDS flags, remove this when running this
 249                  * on client*/
 250                 data->ocd_connect_flags |= OBD_CONNECT_MDS_MDS;
 251                 spin_lock(&imp->imp_lock);
 252                 imp->imp_server_timeout = 1;
 253                 spin_unlock(&imp->imp_lock);
 254                 imp->imp_client->cli_request_portal = MDS_MDS_PORTAL;
 255                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 256                       obd->obd_name);
 257                 ltd = &lod->lod_mdt_descs;
 258         }
 259
 260         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 261         OBD_FREE_PTR(data);
 262         if (rc) {
 263                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 264                        obd->obd_name, osp, rc);
 265                 GOTO(out_free, rc);
 266         }
 267
 268         LASSERT(obd->obd_lu_dev);
 269         LASSERT(obd->obd_lu_dev->ld_site = lod->lod_dt_dev.dd_lu_dev.ld_site);
 270
 271         ldev = obd->obd_lu_dev;
 272         d = lu2dt_dev(ldev);
 273
 274         /* Allocate ost descriptor and fill it */
 275         OBD_ALLOC_PTR(tgt_desc);
 276         if (!tgt_desc)
 277                 GOTO(out_conn, rc = -ENOMEM);
 278
 279         tgt_desc->ltd_tgt    = d;
 280         tgt_desc->ltd_exp    = exp;
 281         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 282         tgt_desc->ltd_gen    = gen;
 283         tgt_desc->ltd_index  = index;
 284         tgt_desc->ltd_active = active;
 285
 286         lod_getref(ltd);
 287         if (index >= ltd->ltd_tgts_size) {
 288                 /* we have to increase the size of the lod_osts array */
 289                 __u32  newsize;
 290
 291                 newsize = max(ltd->ltd_tgts_size, (__u32)2);
 292                 while (newsize < index + 1)
 293                         newsize = newsize << 1;
 294
 295                 /* lod_bitmap_resize() needs lod_rw_sem
 296                  * which we hold with th reference */
 297                 lod_putref(lod, ltd);
 298
 299                 rc = ltd_bitmap_resize(ltd, newsize);
 300                 if (rc)
 301                         GOTO(out_desc, rc);
 302
 303                 lod_getref(ltd);
 304         }
 305
 306         mutex_lock(&ltd->ltd_mutex);
 307         if (cfs_bitmap_check(ltd->ltd_tgt_bitmap, index)) {
 308                 CERROR("%s: device %d is registered already\n", obd->obd_name,
 309                        index);
 310                 GOTO(out_mutex, rc = -EEXIST);
 311         }
 312
 313         if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 314                 OBD_ALLOC_PTR(ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK]);
 315                 if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 316                         CERROR("can't allocate index to add %s\n",
 317                                obd->obd_name);
 318                         GOTO(out_mutex, rc = -ENOMEM);
 319                 }
 320         }
 321
 322         if (!strcmp(LUSTRE_OSC_NAME, type)) {
 323                 /* pool and qos are not supported for MDS stack yet */
 324                 rc = lod_ost_pool_add(&lod->lod_pool_info, index,
 325                                       lod->lod_osts_size);
 326                 if (rc) {
 327                         CERROR("%s: can't set up pool, failed with %d\n",
 328                                obd->obd_name, rc);
 329                         GOTO(out_mutex, rc);
 330                 }
 331
 332                 rc = qos_add_tgt(lod, tgt_desc);
 333                 if (rc) {
 334                         CERROR("%s: qos_add_tgt failed with %d\n",
 335                                 obd->obd_name, rc);
 336                         GOTO(out_pool, rc);
 337                 }
 338
 339                 /* The new OST is now a full citizen */
 340                 if (index >= lod->lod_desc.ld_tgt_count)
 341                         lod->lod_desc.ld_tgt_count = index + 1;
 342                 if (active)
 343                         lod->lod_desc.ld_active_tgt_count++;
 344         }
 345
 346         LTD_TGT(ltd, index) = tgt_desc;
 347         cfs_bitmap_set(ltd->ltd_tgt_bitmap, index);
 348         ltd->ltd_tgtnr++;
 349         mutex_unlock(&ltd->ltd_mutex);
 350         lod_putref(lod, ltd);
 351         if (lod->lod_recovery_completed)
 352                 ldev->ld_ops->ldo_recovery_complete(env, ldev);
 353
 354         RETURN(0);
 355
 356 out_pool:
 357         lod_ost_pool_remove(&lod->lod_pool_info, index);
 358 out_mutex:
 359         mutex_unlock(&ltd->ltd_mutex);
 360         lod_putref(lod, ltd);
 361 out_desc:
 362         OBD_FREE_PTR(tgt_desc);
 363 out_conn:
 364         obd_disconnect(exp);
 365 out_free:
 366         return rc;
 367 }
 368
 369 /*
 370  * helper function to schedule OST removal from the device table
 371  */
 372 static void __lod_del_device(struct lod_tgt_descs *ltd,
 373                              unsigned idx)
 374 {
 375         LASSERT(LTD_TGT(ltd, idx));
 376         if (LTD_TGT(ltd, idx)->ltd_reap == 0) {
 377                 LTD_TGT(ltd, idx)->ltd_reap = 1;
 378                 ltd->ltd_death_row++;
 379         }
 380 }
 381
 382 int lod_fini_tgt(struct lod_device *lod, struct lod_tgt_descs *ltd)
 383 {
 384         int idx;
 385
 386         if (ltd->ltd_tgts_size <= 0)
 387                 return 0;
 388         lod_getref(ltd);
 389         mutex_lock(&ltd->ltd_mutex);
 390         cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx)
 391                 __lod_del_device(ltd, idx);
 392         mutex_unlock(&ltd->ltd_mutex);
 393         lod_putref(lod, ltd);
 394         CFS_FREE_BITMAP(ltd->ltd_tgt_bitmap);
 395         for (idx = 0; idx < TGT_PTRS; idx++) {
 396                 if (ltd->ltd_tgt_idx[idx])
 397                         OBD_FREE_PTR(ltd->ltd_tgt_idx[idx]);
 398         }
 399         ltd->ltd_tgts_size = 0;
 400         return 0;
 401 }
 402
 403 /*
 404  * Add support for administratively disabled OST (through the MGS).
 405  * Schedule a target for deletion.  Disconnection and real removal from the
 406  * table takes place in lod_putref() once the last table user release its
 407  * reference.
 408  *
 409  * \param env - is the environment passed by the caller
 410  * \param lod - is the lod device currently connected to the OSP about to be
 411  *              removed
 412  * \param osp - is the name of OSP device about to be removed
 413  * \param idx - is the OSP index
 414  * \param gen - is the generation number, not used currently
 415  */
 416 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 417                    struct lod_tgt_descs *ltd, char *osp, unsigned idx,
 418                    unsigned gen)
 419 {
 420         struct obd_device *obd;
 421         int                rc = 0;
 422         struct obd_uuid    uuid;
 423         ENTRY;
 424
 425         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 426
 427         obd_str2uuid(&uuid, osp);
 428
 429         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 430                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 431         if (obd == NULL) {
 432                 CERROR("can't find %s device\n", osp);
 433                 RETURN(-EINVAL);
 434         }
 435
 436         if (gen <= 0) {
 437                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 438                        "\n", obd->obd_name, osp, gen);
 439                 RETURN(-EINVAL);
 440         }
 441
 442         obd_str2uuid(&uuid,  osp);
 443
 444         lod_getref(ltd);
 445         mutex_lock(&ltd->ltd_mutex);
 446         /* check that the index is allocated in the bitmap */
 447         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) ||
 448             !LTD_TGT(ltd, idx)) {
 449                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 450                 GOTO(out, rc = -EINVAL);
 451         }
 452
 453         /* check that the UUID matches */
 454         if (!obd_uuid_equals(&uuid, &LTD_TGT(ltd, idx)->ltd_uuid)) {
 455                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 456                        obd->obd_name, obd_uuid2str(&LTD_TGT(ltd,idx)->ltd_uuid),
 457                        idx, osp);
 458                 GOTO(out, rc = -EINVAL);
 459         }
 460
 461         __lod_del_device(ltd, idx);
 462         EXIT;
 463 out:
 464         mutex_unlock(&ltd->ltd_mutex);
 465         lod_putref(lod, ltd);
 466         return(rc);
 467 }
 468
 469 int lod_ea_store_resize(struct lod_thread_info *info, int size)
 470 {
 471         int round = size_roundup_power2(size);
 472
 473         LASSERT(round <= lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
 474         if (info->lti_ea_store) {
 475                 LASSERT(info->lti_ea_store_size);
 476                 LASSERT(info->lti_ea_store_size < round);
 477                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 478                        info->lti_ea_store_size, round);
 479                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 480                 info->lti_ea_store = NULL;
 481                 info->lti_ea_store_size = 0;
 482         }
 483
 484         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 485         if (info->lti_ea_store == NULL)
 486                 RETURN(-ENOMEM);
 487         info->lti_ea_store_size = round;
 488         RETURN(0);
 489 }
 490
 491 /*
 492  * generate and write LOV EA for given striped object
 493  */
 494 int lod_generate_and_set_lovea(const struct lu_env *env,
 495                                struct lod_object *lo, struct thandle *th)
 496 {
 497         struct lod_thread_info  *info = lod_env_info(env);
 498         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 499         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 500         struct lov_mds_md_v1    *lmm;
 501         struct lov_ost_data_v1  *objs;
 502         __u32                    magic;
 503         int                      i, rc, lmm_size;
 504         int                      cplen = 0;
 505         ENTRY;
 506
 507         LASSERT(lo);
 508         LASSERT(lo->ldo_stripenr > 0);
 509
 510         magic = lo->ldo_pool ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 511         lmm_size = lov_mds_md_size(lo->ldo_stripenr, magic);
 512         if (info->lti_ea_store_size < lmm_size) {
 513                 rc = lod_ea_store_resize(info, lmm_size);
 514                 if (rc)
 515                         RETURN(rc);
 516         }
 517
 518         lmm = info->lti_ea_store;
 519
 520         lmm->lmm_magic = cpu_to_le32(magic);
 521         lmm->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
 522         fid_ostid_pack(fid, &lmm->lmm_oi);
 523         ostid_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 524         lmm->lmm_stripe_size = cpu_to_le32(lo->ldo_stripe_size);
 525         lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_stripenr);
 526         lmm->lmm_layout_gen = 0;
 527         if (magic == LOV_MAGIC_V1) {
 528                 objs = &lmm->lmm_objects[0];
 529         } else {
 530                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 531                 cplen = strlcpy(v3->lmm_pool_name, lo->ldo_pool,
 532                                 sizeof(v3->lmm_pool_name));
 533                 if (cplen >= sizeof(v3->lmm_pool_name))
 534                         RETURN(-E2BIG);
 535                 objs = &v3->lmm_objects[0];
 536         }
 537
 538         for (i = 0; i < lo->ldo_stripenr; i++) {
 539                 const struct lu_fid     *fid;
 540                 struct lod_device       *lod;
 541                 __u32                   index;
 542
 543                 lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 544                 LASSERT(lo->ldo_stripe[i]);
 545                 fid = lu_object_fid(&lo->ldo_stripe[i]->do_lu);
 546
 547                 rc = fid_ostid_pack(fid, &info->lti_ostid);
 548                 LASSERT(rc == 0);
 549
 550                 ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 551                 objs[i].l_ost_gen    = cpu_to_le32(0);
 552                 rc = lod_fld_lookup(env, lod, fid, &index, LU_SEQ_RANGE_OST);
 553                 if (rc < 0) {
 554                         CERROR("%s: Can not locate "DFID": rc = %d\n",
 555                                lod2obd(lod)->obd_name, PFID(fid), rc);
 556                         RETURN(rc);
 557                 }
 558                 objs[i].l_ost_idx = cpu_to_le32(index);
 559         }
 560
 561         info->lti_buf.lb_buf = lmm;
 562         info->lti_buf.lb_len = lmm_size;
 563         rc = dt_xattr_set(env, next, &info->lti_buf, XATTR_NAME_LOV, 0,
 564                           th, BYPASS_CAPA);
 565
 566         RETURN(rc);
 567 }
 568
 569 int lod_get_lov_ea(const struct lu_env *env, struct lod_object *lo)
 570 {
 571         struct lod_thread_info *info = lod_env_info(env);
 572         struct dt_object       *next = dt_object_child(&lo->ldo_obj);
 573         int                     rc;
 574         ENTRY;
 575
 576         LASSERT(info);
 577
 578         if (unlikely(info->lti_ea_store_size == 0)) {
 579                 /* just to enter in allocation block below */
 580                 rc = -ERANGE;
 581         } else {
 582 repeat:
 583                 info->lti_buf.lb_buf = info->lti_ea_store;
 584                 info->lti_buf.lb_len = info->lti_ea_store_size;
 585                 rc = dt_xattr_get(env, next, &info->lti_buf, XATTR_NAME_LOV,
 586                                   BYPASS_CAPA);
 587         }
 588         /* if object is not striped or inaccessible */
 589         if (rc == -ENODATA)
 590                 RETURN(0);
 591
 592         if (rc == -ERANGE) {
 593                 /* EA doesn't fit, reallocate new buffer */
 594                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, XATTR_NAME_LOV,
 595                                   BYPASS_CAPA);
 596                 if (rc == -ENODATA)
 597                         RETURN(0);
 598                 else if (rc < 0)
 599                         RETURN(rc);
 600
 601                 LASSERT(rc > 0);
 602                 rc = lod_ea_store_resize(info, rc);
 603                 if (rc)
 604                         RETURN(rc);
 605                 goto repeat;
 606         }
 607
 608         RETURN(rc);
 609 }
 610
 611 int lod_store_def_striping(const struct lu_env *env, struct dt_object *dt,
 612                            struct thandle *th)
 613 {
 614         struct lod_thread_info  *info = lod_env_info(env);
 615         struct lod_object       *lo = lod_dt_obj(dt);
 616         struct dt_object        *next = dt_object_child(dt);
 617         struct lov_user_md_v3   *v3;
 618         int                      rc;
 619         int                      cplen = 0;
 620         ENTRY;
 621
 622         LASSERT(S_ISDIR(dt->do_lu.lo_header->loh_attr));
 623
 624         /*
 625          * store striping defaults into new directory
 626          * used to implement defaults inheritance
 627          */
 628
 629         /* probably nothing to inherite */
 630         if (lo->ldo_striping_cached == 0)
 631                 RETURN(0);
 632
 633         if (LOVEA_DELETE_VALUES(lo->ldo_def_stripe_size, lo->ldo_def_stripenr,
 634                                 lo->ldo_def_stripe_offset))
 635                 RETURN(0);
 636
 637         /* XXX: use thread info */
 638         OBD_ALLOC_PTR(v3);
 639         if (v3 == NULL)
 640                 RETURN(-ENOMEM);
 641
 642         v3->lmm_magic = cpu_to_le32(LOV_MAGIC_V3);
 643         v3->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
 644         v3->lmm_stripe_size = cpu_to_le32(lo->ldo_def_stripe_size);
 645         v3->lmm_stripe_count = cpu_to_le16(lo->ldo_def_stripenr);
 646         v3->lmm_stripe_offset = cpu_to_le16(lo->ldo_def_stripe_offset);
 647         if (lo->ldo_pool) {
 648                 cplen = strlcpy(v3->lmm_pool_name, lo->ldo_pool,
 649                                 sizeof(v3->lmm_pool_name));
 650                 if (cplen >= sizeof(v3->lmm_pool_name)) {
 651                         OBD_FREE_PTR(v3);
 652                         RETURN(-E2BIG);
 653                 }
 654         }
 655
 656         info->lti_buf.lb_buf = v3;
 657         info->lti_buf.lb_len = sizeof(*v3);
 658         rc = dt_xattr_set(env, next, &info->lti_buf, XATTR_NAME_LOV, 0, th,
 659                         BYPASS_CAPA);
 660
 661         OBD_FREE_PTR(v3);
 662
 663         RETURN(rc);
 664 }
 665
 666 /*
 667  * allocate array of objects pointers, find/create objects
 668  * stripenr and other fields should be initialized by this moment
 669  */
 670 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
 671                            struct lov_ost_data_v1 *objs)
 672 {
 673         struct lod_thread_info  *info = lod_env_info(env);
 674         struct lod_device       *md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 675         struct lu_object        *o, *n;
 676         struct lu_device        *nd;
 677         struct dt_object       **stripe;
 678         int                      stripe_len;
 679         int                      i, idx, rc = 0;
 680         ENTRY;
 681
 682         LASSERT(lo);
 683         LASSERT(lo->ldo_stripe == NULL);
 684         LASSERT(lo->ldo_stripenr > 0);
 685         LASSERT(lo->ldo_stripe_size > 0);
 686
 687         stripe_len = lo->ldo_stripenr;
 688         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
 689         if (stripe == NULL)
 690                 RETURN(-ENOMEM);
 691
 692         for (i = 0; i < lo->ldo_stripenr; i++) {
 693                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
 694                 idx = le64_to_cpu(objs[i].l_ost_idx);
 695                 fid_ostid_unpack(&info->lti_fid, &info->lti_ostid, idx);
 696                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
 697                          PFID(&info->lti_fid));
 698                 /*
 699                  * XXX: assertion is left for testing, to make
 700                  * sure we never process requests till configuration
 701                  * is completed. to be changed to -EINVAL
 702                  */
 703
 704                 lod_getref(&md->lod_ost_descs);
 705                 LASSERT(cfs_bitmap_check(md->lod_ost_bitmap, idx));
 706                 LASSERT(OST_TGT(md,idx));
 707                 LASSERTF(OST_TGT(md,idx)->ltd_ost, "idx %d\n", idx);
 708                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
 709                 lod_putref(md, &md->lod_ost_descs);
 710
 711                 /* In the function below, .hs_keycmp resolves to
 712                  * u_obj_hop_keycmp() */
 713                 /* coverity[overrun-buffer-val] */
 714                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
 715                 if (IS_ERR(o))
 716                         GOTO(out, rc = PTR_ERR(o));
 717
 718                 n = lu_object_locate(o->lo_header, nd->ld_type);
 719                 LASSERT(n);
 720
 721                 stripe[i] = container_of(n, struct dt_object, do_lu);
 722         }
 723
 724 out:
 725         if (rc != 0) {
 726                 for (i = 0; i < stripe_len; i++)
 727                         if (stripe[i] != NULL)
 728                                 lu_object_put(env, &stripe[i]->do_lu);
 729
 730                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
 731         } else {
 732                 lo->ldo_stripe = stripe;
 733                 lo->ldo_stripes_allocated = stripe_len;
 734         }
 735
 736         RETURN(rc);
 737 }
 738
 739 /*
 740  * Parse striping information stored in lti_ea_store
 741  */
 742 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
 743                        const struct lu_buf *buf)
 744 {
 745         struct lov_mds_md_v1    *lmm;
 746         struct lov_ost_data_v1  *objs;
 747         __u32                    magic;
 748         int                      rc = 0;
 749         ENTRY;
 750
 751         LASSERT(buf);
 752         LASSERT(buf->lb_buf);
 753         LASSERT(buf->lb_len);
 754
 755         lmm = (struct lov_mds_md_v1 *) buf->lb_buf;
 756         magic = le32_to_cpu(lmm->lmm_magic);
 757
 758         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 759                 GOTO(out, rc = -EINVAL);
 760         if (le32_to_cpu(lmm->lmm_pattern) != LOV_PATTERN_RAID0)
 761                 GOTO(out, rc = -EINVAL);
 762
 763         lo->ldo_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 764         lo->ldo_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
 765         lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 766
 767         LASSERT(buf->lb_len >= lov_mds_md_size(lo->ldo_stripenr, magic));
 768
 769         if (magic == LOV_MAGIC_V3) {
 770                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 771                 objs = &v3->lmm_objects[0];
 772                 lod_object_set_pool(lo, v3->lmm_pool_name);
 773         } else {
 774                 objs = &lmm->lmm_objects[0];
 775         }
 776
 777         rc = lod_initialize_objects(env, lo, objs);
 778
 779 out:
 780         RETURN(rc);
 781 }
 782
 783 /*
 784  * Load and parse striping information, create in-core representation for the
 785  * stripes
 786  */
 787 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
 788 {
 789         struct lod_thread_info  *info = lod_env_info(env);
 790         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 791         int                      rc;
 792         ENTRY;
 793
 794         /*
 795          * currently this code is supposed to be called from declaration
 796          * phase only, thus the object is not expected to be locked by caller
 797          */
 798         dt_write_lock(env, next, 0);
 799         /* already initialized? */
 800         if (lo->ldo_stripe) {
 801                 int i;
 802                 /* check validity */
 803                 for (i = 0; i < lo->ldo_stripenr; i++)
 804                         LASSERTF(lo->ldo_stripe[i], "stripe %d is NULL\n", i);
 805                 GOTO(out, rc = 0);
 806         }
 807
 808         if (!dt_object_exists(next))
 809                 GOTO(out, rc = 0);
 810
 811         /* only regular files can be striped */
 812         if (!(lu_object_attr(lod2lu_obj(lo)) & S_IFREG))
 813                 GOTO(out, rc = 0);
 814
 815         LASSERT(lo->ldo_stripenr == 0);
 816
 817         rc = lod_get_lov_ea(env, lo);
 818         if (rc <= 0)
 819                 GOTO(out, rc);
 820
 821         /*
 822          * there is LOV EA (striping information) in this object
 823          * let's parse it and create in-core objects for the stripes
 824          */
 825         info->lti_buf.lb_buf = info->lti_ea_store;
 826         info->lti_buf.lb_len = info->lti_ea_store_size;
 827         rc = lod_parse_striping(env, lo, &info->lti_buf);
 828 out:
 829         dt_write_unlock(env, next);
 830         RETURN(rc);
 831 }
 832
 833 int lod_verify_striping(struct lod_device *d, const struct lu_buf *buf,
 834                         int specific)
 835 {
 836         struct lov_user_md_v1   *lum;
 837         struct lov_user_md_v3   *v3 = NULL;
 838         struct pool_desc        *pool = NULL;
 839         int                      rc;
 840         ENTRY;
 841
 842         lum = buf->lb_buf;
 843
 844         if (lum->lmm_magic != LOV_USER_MAGIC_V1 &&
 845             lum->lmm_magic != LOV_USER_MAGIC_V3 &&
 846             lum->lmm_magic != LOV_MAGIC_V1_DEF &&
 847             lum->lmm_magic != LOV_MAGIC_V3_DEF) {
 848                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#x\n",
 849                        lum->lmm_magic);
 850                 RETURN(-EINVAL);
 851         }
 852
 853         if ((specific && lum->lmm_pattern != LOV_PATTERN_RAID0) ||
 854             (specific == 0 && lum->lmm_pattern != 0)) {
 855                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
 856                        lum->lmm_pattern);
 857                 RETURN(-EINVAL);
 858         }
 859
 860         /* 64kB is the largest common page size we see (ia64), and matches the
 861          * check in lfs */
 862         if (lum->lmm_stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
 863                 CDEBUG(D_IOCTL, "stripe size %u not multiple of %u, fixing\n",
 864                        lum->lmm_stripe_size, LOV_MIN_STRIPE_SIZE);
 865                 RETURN(-EINVAL);
 866         }
 867
 868         /* an offset of -1 is treated as a "special" valid offset */
 869         if (lum->lmm_stripe_offset != (typeof(lum->lmm_stripe_offset))(-1)) {
 870                 /* if offset is not within valid range [0, osts_size) */
 871                 if (lum->lmm_stripe_offset >= d->lod_osts_size) {
 872                         CDEBUG(D_IOCTL, "stripe offset %u >= bitmap size %u\n",
 873                                lum->lmm_stripe_offset, d->lod_osts_size);
 874                         RETURN(-EINVAL);
 875                 }
 876
 877                 /* if lmm_stripe_offset is *not* in bitmap */
 878                 if (!cfs_bitmap_check(d->lod_ost_bitmap,
 879                                       lum->lmm_stripe_offset)) {
 880                         CDEBUG(D_IOCTL, "stripe offset %u not in bitmap\n",
 881                                lum->lmm_stripe_offset);
 882                         RETURN(-EINVAL);
 883                 }
 884         }
 885
 886         if (lum->lmm_magic == LOV_USER_MAGIC_V3)
 887                 v3 = buf->lb_buf;
 888
 889         if (v3)
 890                 /* In the function below, .hs_keycmp resolves to
 891                  * pool_hashkey_keycmp() */
 892                 /* coverity[overrun-buffer-val] */
 893                 pool = lod_find_pool(d, v3->lmm_pool_name);
 894
 895         if (pool != NULL) {
 896                 __u16 offs = v3->lmm_stripe_offset;
 897
 898                 if (offs != (typeof(v3->lmm_stripe_offset))(-1)) {
 899                         rc = lod_check_index_in_pool(offs, pool);
 900                         if (rc < 0) {
 901                                 lod_pool_putref(pool);
 902                                 RETURN(-EINVAL);
 903                         }
 904                 }
 905
 906                 if (specific && lum->lmm_stripe_count > pool_tgt_count(pool)) {
 907                         CDEBUG(D_IOCTL,
 908                                "stripe count %u > # OSTs %u in the pool\n",
 909                                lum->lmm_stripe_count, pool_tgt_count(pool));
 910                         lod_pool_putref(pool);
 911                         RETURN(-EINVAL);
 912                 }
 913
 914                 lod_pool_putref(pool);
 915         }
 916
 917         RETURN(0);
 918 }
 919
 920 void lod_fix_desc_stripe_size(__u64 *val)
 921 {
 922         if (*val < LOV_DEFAULT_STRIPE_SIZE) {
 923                 LCONSOLE_WARN("Increasing default stripe size to min %u\n",
 924                               LOV_DEFAULT_STRIPE_SIZE);
 925                 *val = LOV_DEFAULT_STRIPE_SIZE;
 926         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
 927                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
 928                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
 929                               "multiple of %u)\n",
 930                               *val, LOV_MIN_STRIPE_SIZE);
 931         }
 932 }
 933
 934 void lod_fix_desc_stripe_count(__u32 *val)
 935 {
 936         if (*val == 0)
 937                 *val = 1;
 938 }
 939
 940 void lod_fix_desc_pattern(__u32 *val)
 941 {
 942         /* from lov_setstripe */
 943         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
 944                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
 945                 *val = 0;
 946         }
 947 }
 948
 949 void lod_fix_desc_qos_maxage(__u32 *val)
 950 {
 951         /* fix qos_maxage */
 952         if (*val == 0)
 953                 *val = QOS_DEFAULT_MAXAGE;
 954 }
 955
 956 void lod_fix_desc(struct lov_desc *desc)
 957 {
 958         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
 959         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
 960         lod_fix_desc_pattern(&desc->ld_pattern);
 961         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
 962 }
 963
 964 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
 965 {
 966         struct obd_device          *obd;
 967         struct lov_desc            *desc;
 968         int                         rc;
 969         ENTRY;
 970
 971         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
 972         LASSERT(obd != NULL);
 973         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
 974
 975         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 976                 CERROR("LOD setup requires a descriptor\n");
 977                 RETURN(-EINVAL);
 978         }
 979
 980         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
 981
 982         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 983                 CERROR("descriptor size wrong: %d > %d\n",
 984                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
 985                 RETURN(-EINVAL);
 986         }
 987
 988         if (desc->ld_magic != LOV_DESC_MAGIC) {
 989                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
 990                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
 991                                obd->obd_name, desc);
 992                         lustre_swab_lov_desc(desc);
 993                 } else {
 994                         CERROR("%s: Bad lov desc magic: %#x\n",
 995                                obd->obd_name, desc->ld_magic);
 996                         RETURN(-EINVAL);
 997                 }
 998         }
 999
1000         lod_fix_desc(desc);
1001
1002         desc->ld_active_tgt_count = 0;
1003         lod->lod_desc = *desc;
1004
1005         lod->lod_sp_me = LUSTRE_SP_CLI;
1006
1007         /* Set up allocation policy (QoS and RR) */
1008         CFS_INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
1009         init_rwsem(&lod->lod_qos.lq_rw_sem);
1010         lod->lod_qos.lq_dirty = 1;
1011         lod->lod_qos.lq_rr.lqr_dirty = 1;
1012         lod->lod_qos.lq_reset = 1;
1013         /* Default priority is toward free space balance */
1014         lod->lod_qos.lq_prio_free = 232;
1015         /* Default threshold for rr (roughly 17%) */
1016         lod->lod_qos.lq_threshold_rr = 43;
1017         /* Init statfs fields */
1018         OBD_ALLOC_PTR(lod->lod_qos.lq_statfs_data);
1019         if (NULL == lod->lod_qos.lq_statfs_data)
1020                 RETURN(-ENOMEM);
1021         cfs_waitq_init(&lod->lod_qos.lq_statfs_waitq);
1022
1023         /* Set up OST pool environment */
1024         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
1025                                                    HASH_POOLS_MAX_BITS,
1026                                                    HASH_POOLS_BKT_BITS, 0,
1027                                                    CFS_HASH_MIN_THETA,
1028                                                    CFS_HASH_MAX_THETA,
1029                                                    &pool_hash_operations,
1030                                                    CFS_HASH_DEFAULT);
1031         if (!lod->lod_pools_hash_body)
1032                 GOTO(out_statfs, rc = -ENOMEM);
1033         CFS_INIT_LIST_HEAD(&lod->lod_pool_list);
1034         lod->lod_pool_count = 0;
1035         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
1036         if (rc)
1037                 GOTO(out_hash, rc);
1038         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
1039         if (rc)
1040                 GOTO(out_pool_info, rc);
1041
1042         RETURN(0);
1043
1044 out_pool_info:
1045         lod_ost_pool_free(&lod->lod_pool_info);
1046 out_hash:
1047         cfs_hash_putref(lod->lod_pools_hash_body);
1048 out_statfs:
1049         OBD_FREE_PTR(lod->lod_qos.lq_statfs_data);
1050         return rc;
1051 }
1052
1053 int lod_pools_fini(struct lod_device *lod)
1054 {
1055         struct obd_device   *obd = lod2obd(lod);
1056         cfs_list_t          *pos, *tmp;
1057         struct pool_desc    *pool;
1058         ENTRY;
1059
1060         cfs_list_for_each_safe(pos, tmp, &lod->lod_pool_list) {
1061                 pool = cfs_list_entry(pos, struct pool_desc, pool_list);
1062                 /* free pool structs */
1063                 CDEBUG(D_INFO, "delete pool %p\n", pool);
1064                 /* In the function below, .hs_keycmp resolves to
1065                  * pool_hashkey_keycmp() */
1066                 /* coverity[overrun-buffer-val] */
1067                 lod_pool_del(obd, pool->pool_name);
1068         }
1069
1070         cfs_hash_putref(lod->lod_pools_hash_body);
1071         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
1072         lod_ost_pool_free(&lod->lod_pool_info);
1073         OBD_FREE_PTR(lod->lod_qos.lq_statfs_data);
1074         RETURN(0);
1075 }
1076