lustre/obdecho/echo.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) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2010, 2014, 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  * lustre/obdecho/echo.c
  37  *
  38  * Author: Peter Braam <braam@clusterfs.com>
  39  * Author: Andreas Dilger <adilger@clusterfs.com>
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_ECHO
  43
  44 #include <obd_support.h>
  45 #include <obd_class.h>
  46 #include <lustre_debug.h>
  47 #include <lustre_dlm.h>
  48 #include <lprocfs_status.h>
  49
  50 #include "echo_internal.h"
  51
  52 /* The echo objid needs to be below 2^32, because regular FID numbers are
  53  * limited to 2^32 objects in f_oid for the FID_SEQ_ECHO range. b=23335 */
  54 #define ECHO_INIT_OID        0x10000000ULL
  55 #define ECHO_HANDLE_MAGIC    0xabcd0123fedc9876ULL
  56
  57 #define ECHO_PERSISTENT_PAGES (ECHO_PERSISTENT_SIZE >> PAGE_CACHE_SHIFT)
  58 static struct page *echo_persistent_pages[ECHO_PERSISTENT_PAGES];
  59
  60 enum {
  61         LPROC_ECHO_READ_BYTES = 1,
  62         LPROC_ECHO_WRITE_BYTES = 2,
  63         LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES +1
  64 };
  65
  66 static int echo_connect(const struct lu_env *env,
  67                         struct obd_export **exp, struct obd_device *obd,
  68                         struct obd_uuid *cluuid, struct obd_connect_data *data,
  69                         void *localdata)
  70 {
  71         struct lustre_handle conn = { 0 };
  72         int rc;
  73
  74         data->ocd_connect_flags &= ECHO_CONNECT_SUPPORTED;
  75         rc = class_connect(&conn, obd, cluuid);
  76         if (rc) {
  77                 CERROR("can't connect %d\n", rc);
  78                 return rc;
  79         }
  80         *exp = class_conn2export(&conn);
  81
  82         return 0;
  83 }
  84
  85 static int echo_disconnect(struct obd_export *exp)
  86 {
  87         LASSERT (exp != NULL);
  88
  89         return server_disconnect_export(exp);
  90 }
  91
  92 static int echo_init_export(struct obd_export *exp)
  93 {
  94         return ldlm_init_export(exp);
  95 }
  96
  97 static int echo_destroy_export(struct obd_export *exp)
  98 {
  99         ENTRY;
 100
 101         target_destroy_export(exp);
 102         ldlm_destroy_export(exp);
 103
 104         RETURN(0);
 105 }
 106
 107 static u64 echo_next_id(struct obd_device *obddev)
 108 {
 109         u64 id;
 110
 111         spin_lock(&obddev->u.echo.eo_lock);
 112         id = ++obddev->u.echo.eo_lastino;
 113         spin_unlock(&obddev->u.echo.eo_lock);
 114
 115         return id;
 116 }
 117
 118 static int echo_create(const struct lu_env *env, struct obd_export *exp,
 119                        struct obdo *oa, struct obd_trans_info *oti)
 120 {
 121         struct obd_device *obd = class_exp2obd(exp);
 122
 123         if (!obd) {
 124                 CERROR("invalid client cookie "LPX64"\n",
 125                        exp->exp_handle.h_cookie);
 126                 return -EINVAL;
 127         }
 128
 129         if (!(oa->o_mode & S_IFMT)) {
 130                 CERROR("echo obd: no type!\n");
 131                 return -ENOENT;
 132         }
 133
 134         if (!(oa->o_valid & OBD_MD_FLTYPE)) {
 135                 CERROR("invalid o_valid "LPX64"\n", oa->o_valid);
 136                 return -EINVAL;
 137         }
 138
 139         ostid_set_seq_echo(&oa->o_oi);
 140         ostid_set_id(&oa->o_oi, echo_next_id(obd));
 141         oa->o_valid = OBD_MD_FLID;
 142
 143         return 0;
 144 }
 145
 146 static int echo_destroy(const struct lu_env *env, struct obd_export *exp,
 147                         struct obdo *oa, struct obd_trans_info *oti)
 148 {
 149         struct obd_device *obd = class_exp2obd(exp);
 150
 151         ENTRY;
 152         if (!obd) {
 153                 CERROR("invalid client cookie "LPX64"\n",
 154                        exp->exp_handle.h_cookie);
 155                 RETURN(-EINVAL);
 156         }
 157
 158         if (!(oa->o_valid & OBD_MD_FLID)) {
 159                 CERROR("obdo missing FLID valid flag: "LPX64"\n", oa->o_valid);
 160                 RETURN(-EINVAL);
 161         }
 162
 163         if (ostid_id(&oa->o_oi) > obd->u.echo.eo_lastino ||
 164             ostid_id(&oa->o_oi) < ECHO_INIT_OID) {
 165                 CERROR("bad destroy objid: "DOSTID"\n", POSTID(&oa->o_oi));
 166                 RETURN(-EINVAL);
 167         }
 168
 169         RETURN(0);
 170 }
 171
 172 static int echo_getattr(const struct lu_env *env, struct obd_export *exp,
 173                         struct obd_info *oinfo)
 174 {
 175         struct obd_device *obd = class_exp2obd(exp);
 176         u64 id = ostid_id(&oinfo->oi_oa->o_oi);
 177
 178         ENTRY;
 179         if (!obd) {
 180                 CERROR("invalid client cookie "LPX64"\n",
 181                        exp->exp_handle.h_cookie);
 182                 RETURN(-EINVAL);
 183         }
 184
 185         if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
 186                 CERROR("obdo missing FLID valid flag: "LPX64"\n",
 187                        oinfo->oi_oa->o_valid);
 188                 RETURN(-EINVAL);
 189         }
 190
 191         obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid);
 192         ostid_set_seq_echo(&oinfo->oi_oa->o_oi);
 193         ostid_set_id(&oinfo->oi_oa->o_oi, id);
 194
 195         RETURN(0);
 196 }
 197
 198 static int echo_setattr(const struct lu_env *env, struct obd_export *exp,
 199                         struct obd_info *oinfo, struct obd_trans_info *oti)
 200 {
 201         struct obd_device *obd = class_exp2obd(exp);
 202
 203         ENTRY;
 204         if (!obd) {
 205                 CERROR("invalid client cookie "LPX64"\n",
 206                        exp->exp_handle.h_cookie);
 207                 RETURN(-EINVAL);
 208         }
 209
 210         if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
 211                 CERROR("obdo missing FLID valid flag: "LPX64"\n",
 212                        oinfo->oi_oa->o_valid);
 213                 RETURN(-EINVAL);
 214         }
 215
 216         memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa));
 217
 218         if (ostid_id(&oinfo->oi_oa->o_oi) & 4) {
 219                 /* Save lock to force ACKed reply */
 220                 ldlm_lock_addref (&obd->u.echo.eo_nl_lock, LCK_NL);
 221                 oti->oti_ack_locks[0].mode = LCK_NL;
 222                 oti->oti_ack_locks[0].lock = obd->u.echo.eo_nl_lock;
 223         }
 224
 225         RETURN(0);
 226 }
 227
 228 static void
 229 echo_page_debug_setup(struct page *page, int rw, u64 id,
 230                       __u64 offset, int len)
 231 {
 232         int   page_offset = offset & ~CFS_PAGE_MASK;
 233         char *addr        = ((char *)kmap(page)) + page_offset;
 234
 235         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 236                 CERROR("Unexpected block size %d\n", len);
 237
 238         while (len > 0) {
 239                 if (rw & OBD_BRW_READ)
 240                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 241                                           offset, id);
 242                 else
 243                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 244                                           0xecc0ecc0ecc0ecc0ULL,
 245                                           0xecc0ecc0ecc0ecc0ULL);
 246
 247                 addr   += OBD_ECHO_BLOCK_SIZE;
 248                 offset += OBD_ECHO_BLOCK_SIZE;
 249                 len    -= OBD_ECHO_BLOCK_SIZE;
 250         }
 251
 252         kunmap(page);
 253 }
 254
 255 static int
 256 echo_page_debug_check(struct page *page, u64 id,
 257                       __u64 offset, int len)
 258 {
 259         int   page_offset = offset & ~CFS_PAGE_MASK;
 260         char *addr        = ((char *)kmap(page)) + page_offset;
 261         int   rc          = 0;
 262         int   rc2;
 263
 264         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 265                 CERROR("Unexpected block size %d\n", len);
 266
 267         while (len > 0) {
 268                 rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
 269                                         offset, id);
 270
 271                 if (rc2 != 0 && rc == 0)
 272                         rc = rc2;
 273
 274                 addr   += OBD_ECHO_BLOCK_SIZE;
 275                 offset += OBD_ECHO_BLOCK_SIZE;
 276                 len    -= OBD_ECHO_BLOCK_SIZE;
 277         }
 278
 279         kunmap(page);
 280
 281         return rc;
 282 }
 283
 284 /* This allows us to verify that desc_private is passed unmolested */
 285 #define DESC_PRIV 0x10293847
 286
 287 static int echo_map_nb_to_lb(struct obdo *oa, struct obd_ioobj *obj,
 288                              struct niobuf_remote *nb, int *pages,
 289                              struct niobuf_local *lb, int cmd, int *left)
 290 {
 291         gfp_t gfp_mask = (ostid_id(&obj->ioo_oid) & 1) ?
 292                         GFP_HIGHUSER : GFP_IOFS;
 293         int ispersistent = ostid_id(&obj->ioo_oid) == ECHO_PERSISTENT_OBJID;
 294         int debug_setup = (!ispersistent &&
 295                            (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 296                            (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 297         struct niobuf_local *res = lb;
 298         u64 offset = nb->rnb_offset;
 299         int len = nb->rnb_len;
 300
 301         while (len > 0) {
 302                 int plen = PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1));
 303                 if (len < plen)
 304                         plen = len;
 305
 306                 /* check for local buf overflow */
 307                 if (*left == 0)
 308                         return -EINVAL;
 309
 310                 res->lnb_file_offset = offset;
 311                 res->lnb_len = plen;
 312                 LASSERT((res->lnb_file_offset & ~CFS_PAGE_MASK) +
 313                         res->lnb_len <= PAGE_CACHE_SIZE);
 314
 315                 if (ispersistent &&
 316                     ((res->lnb_file_offset >> PAGE_CACHE_SHIFT) <
 317                       ECHO_PERSISTENT_PAGES)) {
 318                         res->lnb_page =
 319                                 echo_persistent_pages[res->lnb_file_offset >>
 320                                                       PAGE_CACHE_SHIFT];
 321                         /* Take extra ref so __free_pages() can be called OK */
 322                         get_page(res->lnb_page);
 323                 } else {
 324                         OBD_PAGE_ALLOC(res->lnb_page, gfp_mask);
 325                         if (res->lnb_page == NULL) {
 326                                 CERROR("can't get page for id " DOSTID"\n",
 327                                        POSTID(&obj->ioo_oid));
 328                                 return -ENOMEM;
 329                         }
 330                 }
 331
 332                 CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n",
 333                        res->lnb_page, res->lnb_file_offset, res->lnb_len);
 334
 335                 if (cmd & OBD_BRW_READ)
 336                         res->lnb_rc = res->lnb_len;
 337
 338                 if (debug_setup)
 339                         echo_page_debug_setup(res->lnb_page, cmd,
 340                                               ostid_id(&obj->ioo_oid),
 341                                               res->lnb_file_offset,
 342                                               res->lnb_len);
 343
 344                 offset += plen;
 345                 len -= plen;
 346                 res++;
 347
 348                 (*left)--;
 349                 (*pages)++;
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int echo_finalize_lb(struct obdo *oa, struct obd_ioobj *obj,
 356                             struct niobuf_remote *rb, int *pgs,
 357                             struct niobuf_local *lb, int verify)
 358 {
 359         struct niobuf_local *res = lb;
 360         u64 start = rb->rnb_offset >> PAGE_CACHE_SHIFT;
 361         u64 end   = (rb->rnb_offset + rb->rnb_len + PAGE_CACHE_SIZE - 1) >>
 362                     PAGE_CACHE_SHIFT;
 363         int     count  = (int)(end - start);
 364         int     rc     = 0;
 365         int     i;
 366
 367         for (i = 0; i < count; i++, (*pgs) ++, res++) {
 368                 struct page *page = res->lnb_page;
 369                 void       *addr;
 370
 371                 if (page == NULL) {
 372                         CERROR("null page objid "LPU64":%p, buf %d/%d\n",
 373                                ostid_id(&obj->ioo_oid), page, i,
 374                                obj->ioo_bufcnt);
 375                         return -EFAULT;
 376                 }
 377
 378                 addr = kmap(page);
 379
 380                 CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n",
 381                        res->lnb_page, addr, res->lnb_file_offset);
 382
 383                 if (verify) {
 384                         int vrc = echo_page_debug_check(page,
 385                                                         ostid_id(&obj->ioo_oid),
 386                                                         res->lnb_file_offset,
 387                                                         res->lnb_len);
 388                         /* check all the pages always */
 389                         if (vrc != 0 && rc == 0)
 390                                 rc = vrc;
 391                 }
 392
 393                 kunmap(page);
 394                 /* NB see comment above regarding persistent pages */
 395                 OBD_PAGE_FREE(page);
 396         }
 397
 398         return rc;
 399 }
 400
 401 static int echo_preprw(const struct lu_env *env, int cmd,
 402                        struct obd_export *export, struct obdo *oa,
 403                        int objcount, struct obd_ioobj *obj,
 404                        struct niobuf_remote *nb, int *pages,
 405                        struct niobuf_local *res, struct obd_trans_info *oti,
 406                        struct lustre_capa *unused)
 407 {
 408         struct obd_device *obd;
 409         int tot_bytes = 0;
 410         int rc = 0;
 411         int i, left;
 412         ENTRY;
 413
 414         obd = export->exp_obd;
 415         if (obd == NULL)
 416                 RETURN(-EINVAL);
 417
 418         /* Temp fix to stop falling foul of osc_announce_cached() */
 419         oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
 420
 421         memset(res, 0, sizeof(*res) * *pages);
 422
 423         CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
 424                cmd == OBD_BRW_READ ? "reading" : "writing", objcount, *pages);
 425
 426         if (oti)
 427                 oti->oti_handle = (void *)DESC_PRIV;
 428
 429         left = *pages;
 430         *pages = 0;
 431
 432         for (i = 0; i < objcount; i++, obj++) {
 433                 int j;
 434
 435                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++) {
 436
 437                         rc = echo_map_nb_to_lb(oa, obj, nb, pages,
 438                                                res + *pages, cmd, &left);
 439                         if (rc)
 440                                 GOTO(preprw_cleanup, rc);
 441
 442                         tot_bytes += nb->rnb_len;
 443                 }
 444         }
 445
 446         atomic_add(*pages, &obd->u.echo.eo_prep);
 447
 448         if (cmd & OBD_BRW_READ)
 449                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 450                                     tot_bytes);
 451         else
 452                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 453                                     tot_bytes);
 454
 455         CDEBUG(D_PAGE, "%d pages allocated after prep\n",
 456                atomic_read(&obd->u.echo.eo_prep));
 457
 458         RETURN(0);
 459
 460 preprw_cleanup:
 461         /* It is possible that we would rather handle errors by  allow
 462          * any already-set-up pages to complete, rather than tearing them
 463          * all down again.  I believe that this is what the in-kernel
 464          * prep/commit operations do.
 465          */
 466         CERROR("cleaning up %u pages (%d obdos)\n", *pages, objcount);
 467         for (i = 0; i < *pages; i++) {
 468                 kunmap(res[i].lnb_page);
 469                 /* NB if this is a persistent page, __free_pages will just
 470                  * lose the extra ref gained above */
 471                 OBD_PAGE_FREE(res[i].lnb_page);
 472                 res[i].lnb_page = NULL;
 473                 atomic_dec(&obd->u.echo.eo_prep);
 474         }
 475
 476         return rc;
 477 }
 478
 479 static int echo_commitrw(const struct lu_env *env, int cmd,
 480                          struct obd_export *export, struct obdo *oa,
 481                          int objcount, struct obd_ioobj *obj,
 482                          struct niobuf_remote *rb, int niocount,
 483                          struct niobuf_local *res, struct obd_trans_info *oti,
 484                          int rc)
 485 {
 486         struct obd_device *obd;
 487         int pgs = 0;
 488         int i;
 489         ENTRY;
 490
 491         obd = export->exp_obd;
 492         if (obd == NULL)
 493                 RETURN(-EINVAL);
 494
 495         if (rc)
 496                 GOTO(commitrw_cleanup, rc);
 497
 498         if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
 499                 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
 500                        objcount, niocount);
 501         } else {
 502                 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
 503                        objcount, niocount);
 504         }
 505
 506         if (niocount && res == NULL) {
 507                 CERROR("NULL res niobuf with niocount %d\n", niocount);
 508                 RETURN(-EINVAL);
 509         }
 510
 511         LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV);
 512
 513         for (i = 0; i < objcount; i++, obj++) {
 514                 int verify = (rc == 0 &&
 515                              ostid_id(&obj->ioo_oid) != ECHO_PERSISTENT_OBJID &&
 516                               (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 517                               (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 518                 int j;
 519
 520                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, rb++) {
 521                         int vrc = echo_finalize_lb(oa, obj, rb, &pgs, &res[pgs],
 522                                                    verify);
 523                         if (vrc == 0)
 524                                 continue;
 525
 526                         if (vrc == -EFAULT)
 527                                 GOTO(commitrw_cleanup, rc = vrc);
 528
 529                         if (rc == 0)
 530                                 rc = vrc;
 531                 }
 532
 533         }
 534
 535         atomic_sub(pgs, &obd->u.echo.eo_prep);
 536
 537         CDEBUG(D_PAGE, "%d pages remain after commit\n",
 538                atomic_read(&obd->u.echo.eo_prep));
 539         RETURN(rc);
 540
 541 commitrw_cleanup:
 542         atomic_sub(pgs, &obd->u.echo.eo_prep);
 543
 544         CERROR("cleaning up %d pages (%d obdos)\n",
 545                niocount - pgs - 1, objcount);
 546
 547         while (pgs < niocount) {
 548                 struct page *page = res[pgs++].lnb_page;
 549
 550                 if (page == NULL)
 551                         continue;
 552
 553                 /* NB see comment above regarding persistent pages */
 554                 OBD_PAGE_FREE(page);
 555                 atomic_dec(&obd->u.echo.eo_prep);
 556         }
 557         return rc;
 558 }
 559
 560 LPROC_SEQ_FOPS_RO_TYPE(echo, uuid);
 561 static struct lprocfs_seq_vars lprocfs_echo_obd_vars[] = {
 562         { .name =       "uuid",
 563           .fops =       &echo_uuid_fops         },
 564         { 0 }
 565 };
 566
 567 static int echo_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 568 {
 569         int                     rc;
 570         __u64                   lock_flags = 0;
 571         struct ldlm_res_id      res_id = {.name = {1}};
 572         char                    ns_name[48];
 573         ENTRY;
 574
 575         obd->u.echo.eo_obt.obt_magic = OBT_MAGIC;
 576         spin_lock_init(&obd->u.echo.eo_lock);
 577         obd->u.echo.eo_lastino = ECHO_INIT_OID;
 578
 579         sprintf(ns_name, "echotgt-%s", obd->obd_uuid.uuid);
 580         obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
 581                                                 LDLM_NAMESPACE_SERVER,
 582                                                 LDLM_NAMESPACE_MODEST,
 583                                                 LDLM_NS_TYPE_OST);
 584         if (obd->obd_namespace == NULL) {
 585                 LBUG();
 586                 RETURN(-ENOMEM);
 587         }
 588
 589         rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_PLAIN,
 590                                     NULL, LCK_NL, &lock_flags, NULL,
 591                                     ldlm_completion_ast, NULL, NULL, 0,
 592                                     LVB_T_NONE, NULL, &obd->u.echo.eo_nl_lock);
 593         LASSERT (rc == ELDLM_OK);
 594
 595         obd->obd_vars = lprocfs_echo_obd_vars;
 596         if (lprocfs_obd_setup(obd) == 0 &&
 597             lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
 598                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 599                                      LPROCFS_CNTR_AVGMINMAX,
 600                                      "read_bytes", "bytes");
 601                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 602                                      LPROCFS_CNTR_AVGMINMAX,
 603                                      "write_bytes", "bytes");
 604         }
 605
 606         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
 607                            "echo_ldlm_cb_client", &obd->obd_ldlm_client);
 608         RETURN(0);
 609 }
 610
 611 static int echo_cleanup(struct obd_device *obd)
 612 {
 613         int leaked;
 614         ENTRY;
 615
 616         lprocfs_obd_cleanup(obd);
 617         lprocfs_free_obd_stats(obd);
 618
 619         ldlm_lock_decref(&obd->u.echo.eo_nl_lock, LCK_NL);
 620
 621         /* XXX Bug 3413; wait for a bit to ensure the BL callback has
 622          * happened before calling ldlm_namespace_free() */
 623         schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE, cfs_time_seconds(1));
 624
 625         ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
 626         obd->obd_namespace = NULL;
 627
 628         leaked = atomic_read(&obd->u.echo.eo_prep);
 629         if (leaked != 0)
 630                 CERROR("%d prep/commitrw pages leaked\n", leaked);
 631
 632         RETURN(0);
 633 }
 634
 635 struct obd_ops echo_obd_ops = {
 636         .o_owner           = THIS_MODULE,
 637         .o_connect         = echo_connect,
 638         .o_disconnect      = echo_disconnect,
 639         .o_init_export     = echo_init_export,
 640         .o_destroy_export  = echo_destroy_export,
 641         .o_create          = echo_create,
 642         .o_destroy         = echo_destroy,
 643         .o_getattr         = echo_getattr,
 644         .o_setattr         = echo_setattr,
 645         .o_preprw          = echo_preprw,
 646         .o_commitrw        = echo_commitrw,
 647         .o_setup           = echo_setup,
 648         .o_cleanup         = echo_cleanup
 649 };
 650
 651 void echo_persistent_pages_fini(void)
 652 {
 653         int     i;
 654
 655         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
 656                 if (echo_persistent_pages[i] != NULL) {
 657                         OBD_PAGE_FREE(echo_persistent_pages[i]);
 658                         echo_persistent_pages[i] = NULL;
 659                 }
 660 }
 661
 662 int echo_persistent_pages_init(void)
 663 {
 664         struct page *pg;
 665         int          i;
 666
 667         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
 668                 gfp_t gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ?
 669                         GFP_IOFS : GFP_HIGHUSER;
 670
 671                 OBD_PAGE_ALLOC(pg, gfp_mask);
 672                 if (pg == NULL) {
 673                         echo_persistent_pages_fini();
 674                         return -ENOMEM;
 675                 }
 676
 677                 memset (kmap (pg), 0, PAGE_CACHE_SIZE);
 678                 kunmap (pg);
 679
 680                 echo_persistent_pages[i] = pg;
 681         }
 682
 683         return 0;
 684 }