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, 2013, 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         obd_id 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 lov_stripe_md **ea,
 120                        struct obd_trans_info *oti)
 121 {
 122         struct obd_device *obd = class_exp2obd(exp);
 123
 124         if (!obd) {
 125                 CERROR("invalid client cookie "LPX64"\n",
 126                        exp->exp_handle.h_cookie);
 127                 return -EINVAL;
 128         }
 129
 130         if (!(oa->o_mode && S_IFMT)) {
 131                 CERROR("echo obd: no type!\n");
 132                 return -ENOENT;
 133         }
 134
 135         if (!(oa->o_valid & OBD_MD_FLTYPE)) {
 136                 CERROR("invalid o_valid "LPX64"\n", oa->o_valid);
 137                 return -EINVAL;
 138         }
 139
 140         ostid_set_seq_echo(&oa->o_oi);
 141         ostid_set_id(&oa->o_oi, echo_next_id(obd));
 142         oa->o_valid = OBD_MD_FLID;
 143
 144         return 0;
 145 }
 146
 147 static int echo_destroy(const struct lu_env *env, struct obd_export *exp,
 148                         struct obdo *oa, struct lov_stripe_md *ea,
 149                         struct obd_trans_info *oti, struct obd_export *md_exp,
 150                         void *capa)
 151 {
 152         struct obd_device *obd = class_exp2obd(exp);
 153
 154         ENTRY;
 155         if (!obd) {
 156                 CERROR("invalid client cookie "LPX64"\n",
 157                        exp->exp_handle.h_cookie);
 158                 RETURN(-EINVAL);
 159         }
 160
 161         if (!(oa->o_valid & OBD_MD_FLID)) {
 162                 CERROR("obdo missing FLID valid flag: "LPX64"\n", oa->o_valid);
 163                 RETURN(-EINVAL);
 164         }
 165
 166         if (ostid_id(&oa->o_oi) > obd->u.echo.eo_lastino ||
 167             ostid_id(&oa->o_oi) < ECHO_INIT_OID) {
 168                 CERROR("bad destroy objid: "DOSTID"\n", POSTID(&oa->o_oi));
 169                 RETURN(-EINVAL);
 170         }
 171
 172         RETURN(0);
 173 }
 174
 175 static int echo_getattr(const struct lu_env *env, struct obd_export *exp,
 176                         struct obd_info *oinfo)
 177 {
 178         struct obd_device *obd = class_exp2obd(exp);
 179         obd_id id = ostid_id(&oinfo->oi_oa->o_oi);
 180
 181         ENTRY;
 182         if (!obd) {
 183                 CERROR("invalid client cookie "LPX64"\n",
 184                        exp->exp_handle.h_cookie);
 185                 RETURN(-EINVAL);
 186         }
 187
 188         if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
 189                 CERROR("obdo missing FLID valid flag: "LPX64"\n",
 190                        oinfo->oi_oa->o_valid);
 191                 RETURN(-EINVAL);
 192         }
 193
 194         obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid);
 195         ostid_set_seq_echo(&oinfo->oi_oa->o_oi);
 196         ostid_set_id(&oinfo->oi_oa->o_oi, id);
 197
 198         RETURN(0);
 199 }
 200
 201 static int echo_setattr(const struct lu_env *env, struct obd_export *exp,
 202                         struct obd_info *oinfo, struct obd_trans_info *oti)
 203 {
 204         struct obd_device *obd = class_exp2obd(exp);
 205
 206         ENTRY;
 207         if (!obd) {
 208                 CERROR("invalid client cookie "LPX64"\n",
 209                        exp->exp_handle.h_cookie);
 210                 RETURN(-EINVAL);
 211         }
 212
 213         if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
 214                 CERROR("obdo missing FLID valid flag: "LPX64"\n",
 215                        oinfo->oi_oa->o_valid);
 216                 RETURN(-EINVAL);
 217         }
 218
 219         memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa));
 220
 221         if (ostid_id(&oinfo->oi_oa->o_oi) & 4) {
 222                 /* Save lock to force ACKed reply */
 223                 ldlm_lock_addref (&obd->u.echo.eo_nl_lock, LCK_NL);
 224                 oti->oti_ack_locks[0].mode = LCK_NL;
 225                 oti->oti_ack_locks[0].lock = obd->u.echo.eo_nl_lock;
 226         }
 227
 228         RETURN(0);
 229 }
 230
 231 static void
 232 echo_page_debug_setup(struct page *page, int rw, obd_id id,
 233                       __u64 offset, int len)
 234 {
 235         int   page_offset = offset & ~CFS_PAGE_MASK;
 236         char *addr        = ((char *)kmap(page)) + page_offset;
 237
 238         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 239                 CERROR("Unexpected block size %d\n", len);
 240
 241         while (len > 0) {
 242                 if (rw & OBD_BRW_READ)
 243                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 244                                           offset, id);
 245                 else
 246                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 247                                           0xecc0ecc0ecc0ecc0ULL,
 248                                           0xecc0ecc0ecc0ecc0ULL);
 249
 250                 addr   += OBD_ECHO_BLOCK_SIZE;
 251                 offset += OBD_ECHO_BLOCK_SIZE;
 252                 len    -= OBD_ECHO_BLOCK_SIZE;
 253         }
 254
 255         kunmap(page);
 256 }
 257
 258 static int
 259 echo_page_debug_check(struct page *page, obd_id id,
 260                       __u64 offset, int len)
 261 {
 262         int   page_offset = offset & ~CFS_PAGE_MASK;
 263         char *addr        = ((char *)kmap(page)) + page_offset;
 264         int   rc          = 0;
 265         int   rc2;
 266
 267         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 268                 CERROR("Unexpected block size %d\n", len);
 269
 270         while (len > 0) {
 271                 rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
 272                                         offset, id);
 273
 274                 if (rc2 != 0 && rc == 0)
 275                         rc = rc2;
 276
 277                 addr   += OBD_ECHO_BLOCK_SIZE;
 278                 offset += OBD_ECHO_BLOCK_SIZE;
 279                 len    -= OBD_ECHO_BLOCK_SIZE;
 280         }
 281
 282         kunmap(page);
 283
 284         return rc;
 285 }
 286
 287 /* This allows us to verify that desc_private is passed unmolested */
 288 #define DESC_PRIV 0x10293847
 289
 290 static int echo_map_nb_to_lb(struct obdo *oa, struct obd_ioobj *obj,
 291                              struct niobuf_remote *nb, int *pages,
 292                              struct niobuf_local *lb, int cmd, int *left)
 293 {
 294         int gfp_mask = (ostid_id(&obj->ioo_oid) & 1) ?
 295                         GFP_HIGHUSER : GFP_IOFS;
 296         int ispersistent = ostid_id(&obj->ioo_oid) == ECHO_PERSISTENT_OBJID;
 297         int debug_setup = (!ispersistent &&
 298                            (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 299                            (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 300         struct niobuf_local *res = lb;
 301         obd_off offset = nb->offset;
 302         int len = nb->len;
 303
 304         while (len > 0) {
 305                 int plen = PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1));
 306                 if (len < plen)
 307                         plen = len;
 308
 309                 /* check for local buf overflow */
 310                 if (*left == 0)
 311                         return -EINVAL;
 312
 313                 res->lnb_file_offset = offset;
 314                 res->len = plen;
 315                 LASSERT((res->lnb_file_offset & ~CFS_PAGE_MASK) + res->len <=
 316                         PAGE_CACHE_SIZE);
 317
 318                 if (ispersistent &&
 319                     ((res->lnb_file_offset >> PAGE_CACHE_SHIFT) <
 320                       ECHO_PERSISTENT_PAGES)) {
 321                         res->page =
 322                                 echo_persistent_pages[res->lnb_file_offset >>
 323                                                       PAGE_CACHE_SHIFT];
 324                         /* Take extra ref so __free_pages() can be called OK */
 325                         get_page (res->page);
 326                 } else {
 327                         OBD_PAGE_ALLOC(res->page, gfp_mask);
 328                         if (res->page == NULL) {
 329                                 CERROR("can't get page for id " DOSTID"\n",
 330                                        POSTID(&obj->ioo_oid));
 331                                 return -ENOMEM;
 332                         }
 333                 }
 334
 335                 CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n",
 336                        res->page, res->lnb_file_offset, res->len);
 337
 338                 if (cmd & OBD_BRW_READ)
 339                         res->rc = res->len;
 340
 341                 if (debug_setup)
 342                         echo_page_debug_setup(res->page, cmd,
 343                                               ostid_id(&obj->ioo_oid),
 344                                               res->lnb_file_offset, res->len);
 345
 346                 offset += plen;
 347                 len -= plen;
 348                 res++;
 349
 350                 (*left)--;
 351                 (*pages)++;
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int echo_finalize_lb(struct obdo *oa, struct obd_ioobj *obj,
 358                             struct niobuf_remote *rb, int *pgs,
 359                             struct niobuf_local *lb, int verify)
 360 {
 361         struct niobuf_local *res = lb;
 362         obd_off start  = rb->offset >> PAGE_CACHE_SHIFT;
 363         obd_off end    = (rb->offset + rb->len + PAGE_CACHE_SIZE - 1) >>
 364                          PAGE_CACHE_SHIFT;
 365         int     count  = (int)(end - start);
 366         int     rc     = 0;
 367         int     i;
 368
 369         for (i = 0; i < count; i++, (*pgs) ++, res++) {
 370                 struct page *page = res->page;
 371                 void       *addr;
 372
 373                 if (page == NULL) {
 374                         CERROR("null page objid "LPU64":%p, buf %d/%d\n",
 375                                ostid_id(&obj->ioo_oid), page, i,
 376                                obj->ioo_bufcnt);
 377                         return -EFAULT;
 378                 }
 379
 380                 addr = kmap(page);
 381
 382                 CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n",
 383                        res->page, addr, res->lnb_file_offset);
 384
 385                 if (verify) {
 386                         int vrc = echo_page_debug_check(page,
 387                                                         ostid_id(&obj->ioo_oid),
 388                                                         res->lnb_file_offset,
 389                                                         res->len);
 390                         /* check all the pages always */
 391                         if (vrc != 0 && rc == 0)
 392                                 rc = vrc;
 393                 }
 394
 395                 kunmap(page);
 396                 /* NB see comment above regarding persistent pages */
 397                 OBD_PAGE_FREE(page);
 398         }
 399
 400         return rc;
 401 }
 402
 403 static int echo_preprw(const struct lu_env *env, int cmd,
 404                        struct obd_export *export, struct obdo *oa,
 405                        int objcount, struct obd_ioobj *obj,
 406                        struct niobuf_remote *nb, int *pages,
 407                        struct niobuf_local *res, struct obd_trans_info *oti,
 408                        struct lustre_capa *unused)
 409 {
 410         struct obd_device *obd;
 411         int tot_bytes = 0;
 412         int rc = 0;
 413         int i, left;
 414         ENTRY;
 415
 416         obd = export->exp_obd;
 417         if (obd == NULL)
 418                 RETURN(-EINVAL);
 419
 420         /* Temp fix to stop falling foul of osc_announce_cached() */
 421         oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
 422
 423         memset(res, 0, sizeof(*res) * *pages);
 424
 425         CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
 426                cmd == OBD_BRW_READ ? "reading" : "writing", objcount, *pages);
 427
 428         if (oti)
 429                 oti->oti_handle = (void *)DESC_PRIV;
 430
 431         left = *pages;
 432         *pages = 0;
 433
 434         for (i = 0; i < objcount; i++, obj++) {
 435                 int j;
 436
 437                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++) {
 438
 439                         rc = echo_map_nb_to_lb(oa, obj, nb, pages,
 440                                                res + *pages, cmd, &left);
 441                         if (rc)
 442                                 GOTO(preprw_cleanup, rc);
 443
 444                         tot_bytes += nb->len;
 445                 }
 446         }
 447
 448         atomic_add(*pages, &obd->u.echo.eo_prep);
 449
 450         if (cmd & OBD_BRW_READ)
 451                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 452                                     tot_bytes);
 453         else
 454                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 455                                     tot_bytes);
 456
 457         CDEBUG(D_PAGE, "%d pages allocated after prep\n",
 458                atomic_read(&obd->u.echo.eo_prep));
 459
 460         RETURN(0);
 461
 462 preprw_cleanup:
 463         /* It is possible that we would rather handle errors by  allow
 464          * any already-set-up pages to complete, rather than tearing them
 465          * all down again.  I believe that this is what the in-kernel
 466          * prep/commit operations do.
 467          */
 468         CERROR("cleaning up %u pages (%d obdos)\n", *pages, objcount);
 469         for (i = 0; i < *pages; i++) {
 470                 kunmap(res[i].page);
 471                 /* NB if this is a persistent page, __free_pages will just
 472                  * lose the extra ref gained above */
 473                 OBD_PAGE_FREE(res[i].page);
 474                 res[i].page = NULL;
 475                 atomic_dec(&obd->u.echo.eo_prep);
 476         }
 477
 478         return rc;
 479 }
 480
 481 static int echo_commitrw(const struct lu_env *env, int cmd,
 482                          struct obd_export *export, struct obdo *oa,
 483                          int objcount, struct obd_ioobj *obj,
 484                          struct niobuf_remote *rb, int niocount,
 485                          struct niobuf_local *res, struct obd_trans_info *oti,
 486                          int rc)
 487 {
 488         struct obd_device *obd;
 489         int pgs = 0;
 490         int i;
 491         ENTRY;
 492
 493         obd = export->exp_obd;
 494         if (obd == NULL)
 495                 RETURN(-EINVAL);
 496
 497         if (rc)
 498                 GOTO(commitrw_cleanup, rc);
 499
 500         if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
 501                 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
 502                        objcount, niocount);
 503         } else {
 504                 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
 505                        objcount, niocount);
 506         }
 507
 508         if (niocount && res == NULL) {
 509                 CERROR("NULL res niobuf with niocount %d\n", niocount);
 510                 RETURN(-EINVAL);
 511         }
 512
 513         LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV);
 514
 515         for (i = 0; i < objcount; i++, obj++) {
 516                 int verify = (rc == 0 &&
 517                              ostid_id(&obj->ioo_oid) != ECHO_PERSISTENT_OBJID &&
 518                               (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 519                               (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 520                 int j;
 521
 522                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, rb++) {
 523                         int vrc = echo_finalize_lb(oa, obj, rb, &pgs, &res[pgs],
 524                                                    verify);
 525                         if (vrc == 0)
 526                                 continue;
 527
 528                         if (vrc == -EFAULT)
 529                                 GOTO(commitrw_cleanup, rc = vrc);
 530
 531                         if (rc == 0)
 532                                 rc = vrc;
 533                 }
 534
 535         }
 536
 537         atomic_sub(pgs, &obd->u.echo.eo_prep);
 538
 539         CDEBUG(D_PAGE, "%d pages remain after commit\n",
 540                atomic_read(&obd->u.echo.eo_prep));
 541         RETURN(rc);
 542
 543 commitrw_cleanup:
 544         atomic_sub(pgs, &obd->u.echo.eo_prep);
 545
 546         CERROR("cleaning up %d pages (%d obdos)\n",
 547                niocount - pgs - 1, objcount);
 548
 549         while (pgs < niocount) {
 550                 struct page *page = res[pgs++].page;
 551
 552                 if (page == NULL)
 553                         continue;
 554
 555                 /* NB see comment above regarding persistent pages */
 556                 OBD_PAGE_FREE(page);
 557                 atomic_dec(&obd->u.echo.eo_prep);
 558         }
 559         return rc;
 560 }
 561
 562 LPROC_SEQ_FOPS_RO_TYPE(echo, uuid);
 563 static struct lprocfs_seq_vars lprocfs_echo_obd_vars[] = {
 564         { "uuid",       &echo_uuid_fops         },
 565         { 0 }
 566 };
 567
 568 static int echo_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 569 {
 570         int                     rc;
 571         __u64                   lock_flags = 0;
 572         struct ldlm_res_id      res_id = {.name = {1}};
 573         char                    ns_name[48];
 574         ENTRY;
 575
 576         obd->u.echo.eo_obt.obt_magic = OBT_MAGIC;
 577         spin_lock_init(&obd->u.echo.eo_lock);
 578         obd->u.echo.eo_lastino = ECHO_INIT_OID;
 579
 580         sprintf(ns_name, "echotgt-%s", obd->obd_uuid.uuid);
 581         obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
 582                                                 LDLM_NAMESPACE_SERVER,
 583                                                 LDLM_NAMESPACE_MODEST,
 584                                                 LDLM_NS_TYPE_OST);
 585         if (obd->obd_namespace == NULL) {
 586                 LBUG();
 587                 RETURN(-ENOMEM);
 588         }
 589
 590         rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_PLAIN,
 591                                     NULL, LCK_NL, &lock_flags, NULL,
 592                                     ldlm_completion_ast, NULL, NULL, 0,
 593                                     LVB_T_NONE, NULL, &obd->u.echo.eo_nl_lock);
 594         LASSERT (rc == ELDLM_OK);
 595
 596         obd->obd_vars = lprocfs_echo_obd_vars;
 597         if (lprocfs_seq_obd_setup(obd) == 0 &&
 598             lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
 599                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 600                                      LPROCFS_CNTR_AVGMINMAX,
 601                                      "read_bytes", "bytes");
 602                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 603                                      LPROCFS_CNTR_AVGMINMAX,
 604                                      "write_bytes", "bytes");
 605         }
 606
 607         ptlrpc_init_client (LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
 608                             "echo_ldlm_cb_client", &obd->obd_ldlm_client);
 609         RETURN(0);
 610 }
 611
 612 static int echo_cleanup(struct obd_device *obd)
 613 {
 614         int leaked;
 615         ENTRY;
 616
 617         lprocfs_obd_cleanup(obd);
 618         lprocfs_free_obd_stats(obd);
 619
 620         ldlm_lock_decref(&obd->u.echo.eo_nl_lock, LCK_NL);
 621
 622         /* XXX Bug 3413; wait for a bit to ensure the BL callback has
 623          * happened before calling ldlm_namespace_free() */
 624         schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE, cfs_time_seconds(1));
 625
 626         ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
 627         obd->obd_namespace = NULL;
 628
 629         leaked = atomic_read(&obd->u.echo.eo_prep);
 630         if (leaked != 0)
 631                 CERROR("%d prep/commitrw pages leaked\n", leaked);
 632
 633         RETURN(0);
 634 }
 635
 636 struct obd_ops echo_obd_ops = {
 637         .o_owner           = THIS_MODULE,
 638         .o_connect         = echo_connect,
 639         .o_disconnect      = echo_disconnect,
 640         .o_init_export     = echo_init_export,
 641         .o_destroy_export  = echo_destroy_export,
 642         .o_create          = echo_create,
 643         .o_destroy         = echo_destroy,
 644         .o_getattr         = echo_getattr,
 645         .o_setattr         = echo_setattr,
 646         .o_preprw          = echo_preprw,
 647         .o_commitrw        = echo_commitrw,
 648         .o_setup           = echo_setup,
 649         .o_cleanup         = echo_cleanup
 650 };
 651
 652 void echo_persistent_pages_fini(void)
 653 {
 654         int     i;
 655
 656         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
 657                 if (echo_persistent_pages[i] != NULL) {
 658                         OBD_PAGE_FREE(echo_persistent_pages[i]);
 659                         echo_persistent_pages[i] = NULL;
 660                 }
 661 }
 662
 663 int echo_persistent_pages_init(void)
 664 {
 665         struct page *pg;
 666         int          i;
 667
 668         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
 669                 int gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ?
 670                         GFP_IOFS : GFP_HIGHUSER;
 671
 672                 OBD_PAGE_ALLOC(pg, gfp_mask);
 673                 if (pg == NULL) {
 674                         echo_persistent_pages_fini();
 675                         return -ENOMEM;
 676                 }
 677
 678                 memset (kmap (pg), 0, PAGE_CACHE_SIZE);
 679                 kunmap (pg);
 680
 681                 echo_persistent_pages[i] = pg;
 682         }
 683
 684         return 0;
 685 }