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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2010, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/obdecho/echo.c
  32  *
  33  * Author: Peter Braam <braam@clusterfs.com>
  34  * Author: Andreas Dilger <adilger@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_ECHO
  38
  39 #include <obd_support.h>
  40 #include <obd_class.h>
  41 #include <lustre_dlm.h>
  42 #include <lprocfs_status.h>
  43
  44 #include "echo_internal.h"
  45
  46 /*
  47  * The echo objid needs to be below 2^32, because regular FID numbers are
  48  * limited to 2^32 objects in f_oid for the FID_SEQ_ECHO range. b=23335
  49  */
  50 #define ECHO_INIT_OID        0x10000000ULL
  51 #define ECHO_HANDLE_MAGIC    0xabcd0123fedc9876ULL
  52
  53 #define ECHO_PERSISTENT_PAGES (ECHO_PERSISTENT_SIZE >> PAGE_SHIFT)
  54 static struct page *echo_persistent_pages[ECHO_PERSISTENT_PAGES];
  55
  56 enum {
  57         LPROC_ECHO_READ_BYTES = 1,
  58         LPROC_ECHO_WRITE_BYTES = 2,
  59         LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES + 1
  60 };
  61
  62 struct echo_srv_device {
  63         struct lu_device esd_dev;
  64         struct lu_target esd_lut;
  65 };
  66
  67 static inline struct echo_srv_device *echo_srv_dev(struct lu_device *d)
  68 {
  69         return container_of_safe(d, struct echo_srv_device, esd_dev);
  70 }
  71
  72 static inline struct obd_device *echo_srv_obd(struct echo_srv_device *esd)
  73 {
  74         return esd->esd_dev.ld_obd;
  75 }
  76
  77 static int echo_connect(const struct lu_env *env,
  78                         struct obd_export **exp, struct obd_device *obd,
  79                         struct obd_uuid *cluuid, struct obd_connect_data *data,
  80                         void *localdata)
  81 {
  82         struct lustre_handle conn = { 0 };
  83         int rc;
  84
  85         data->ocd_connect_flags &= ECHO_CONNECT_SUPPORTED;
  86
  87         if (data->ocd_connect_flags & OBD_CONNECT_FLAGS2)
  88                 data->ocd_connect_flags2 &= ECHO_CONNECT_SUPPORTED2;
  89
  90         rc = class_connect(&conn, obd, cluuid);
  91         if (rc) {
  92                 CERROR("can't connect %d\n", rc);
  93                 return rc;
  94         }
  95         *exp = class_conn2export(&conn);
  96
  97         return 0;
  98 }
  99
 100 static int echo_disconnect(struct obd_export *exp)
 101 {
 102         LASSERT(exp != NULL);
 103
 104         return server_disconnect_export(exp);
 105 }
 106
 107 static int echo_init_export(struct obd_export *exp)
 108 {
 109         return ldlm_init_export(exp);
 110 }
 111
 112 static int echo_destroy_export(struct obd_export *exp)
 113 {
 114         ENTRY;
 115
 116         target_destroy_export(exp);
 117         ldlm_destroy_export(exp);
 118
 119         RETURN(0);
 120 }
 121
 122 static u64 echo_next_id(struct obd_device *obd)
 123 {
 124         u64 id;
 125         struct echo_obd *echo = obd2echo(obd);
 126
 127         spin_lock(&echo->eo_lock);
 128         id = ++echo->eo_lastino;
 129         spin_unlock(&echo->eo_lock);
 130
 131         return id;
 132 }
 133
 134 static void
 135 echo_page_debug_setup(struct page *page, int rw, u64 id,
 136                       __u64 offset, int len)
 137 {
 138         int   page_offset = offset & ~PAGE_MASK;
 139         char *addr        = ((char *)kmap(page)) + page_offset;
 140
 141         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 142                 CERROR("Unexpected block size %d\n", len);
 143
 144         while (len > 0) {
 145                 if (rw & OBD_BRW_READ)
 146                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 147                                           offset, id);
 148                 else
 149                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 150                                           0xecc0ecc0ecc0ecc0ULL,
 151                                           0xecc0ecc0ecc0ecc0ULL);
 152
 153                 addr   += OBD_ECHO_BLOCK_SIZE;
 154                 offset += OBD_ECHO_BLOCK_SIZE;
 155                 len    -= OBD_ECHO_BLOCK_SIZE;
 156         }
 157
 158         kunmap(page);
 159 }
 160
 161 static int
 162 echo_page_debug_check(struct page *page, u64 id,
 163                       __u64 offset, int len)
 164 {
 165         int   page_offset = offset & ~PAGE_MASK;
 166         char *addr        = ((char *)kmap(page)) + page_offset;
 167         int   rc          = 0;
 168         int   rc2;
 169
 170         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 171                 CERROR("Unexpected block size %d\n", len);
 172
 173         while (len > 0) {
 174                 rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
 175                                         offset, id);
 176
 177                 if (rc2 != 0 && rc == 0)
 178                         rc = rc2;
 179
 180                 addr   += OBD_ECHO_BLOCK_SIZE;
 181                 offset += OBD_ECHO_BLOCK_SIZE;
 182                 len    -= OBD_ECHO_BLOCK_SIZE;
 183         }
 184
 185         kunmap(page);
 186
 187         return rc;
 188 }
 189
 190 static int echo_map_nb_to_lb(struct obdo *oa, struct obd_ioobj *obj,
 191                              struct niobuf_remote *nb, int *pages,
 192                              struct niobuf_local *lb, int cmd, int *left)
 193 {
 194         gfp_t gfp_mask = (ostid_id(&obj->ioo_oid) & 1) ?
 195                         GFP_HIGHUSER : GFP_KERNEL;
 196         int ispersistent = ostid_id(&obj->ioo_oid) == ECHO_PERSISTENT_OBJID;
 197         int debug_setup = (!ispersistent &&
 198                            (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 199                            (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 200         struct niobuf_local *res = lb;
 201         u64 offset = nb->rnb_offset;
 202         int len = nb->rnb_len;
 203
 204         while (len > 0) {
 205                 int plen = PAGE_SIZE - (offset & (PAGE_SIZE - 1));
 206
 207                 if (len < plen)
 208                         plen = len;
 209
 210                 /* check for local buf overflow */
 211                 if (*left == 0)
 212                         return -EINVAL;
 213
 214                 res->lnb_file_offset = offset;
 215                 res->lnb_len = plen;
 216                 LASSERT((res->lnb_file_offset & ~PAGE_MASK) +
 217                         res->lnb_len <= PAGE_SIZE);
 218
 219                 if (ispersistent &&
 220                     ((res->lnb_file_offset >> PAGE_SHIFT) <
 221                       ECHO_PERSISTENT_PAGES)) {
 222                         res->lnb_page =
 223                                 echo_persistent_pages[res->lnb_file_offset >>
 224                                                       PAGE_SHIFT];
 225                         /* Take extra ref so __free_pages() can be called OK */
 226                         get_page(res->lnb_page);
 227                 } else {
 228                         res->lnb_page = alloc_page(gfp_mask);
 229                         if (!res->lnb_page) {
 230                                 CERROR("can't get page for id " DOSTID"\n",
 231                                        POSTID(&obj->ioo_oid));
 232                                 return -ENOMEM;
 233                         }
 234                         /* set mapping so page is not considered encrypted */
 235                         res->lnb_page->mapping = ECHO_MAPPING_UNENCRYPTED;
 236                 }
 237
 238                 CDEBUG(D_PAGE, "$$$$ get page %p @ %llu for %d\n",
 239                        res->lnb_page, res->lnb_file_offset, res->lnb_len);
 240
 241                 if (cmd & OBD_BRW_READ)
 242                         res->lnb_rc = res->lnb_len;
 243
 244                 if (debug_setup)
 245                         echo_page_debug_setup(res->lnb_page, cmd,
 246                                               ostid_id(&obj->ioo_oid),
 247                                               res->lnb_file_offset,
 248                                               res->lnb_len);
 249
 250                 offset += plen;
 251                 len -= plen;
 252                 res++;
 253
 254                 (*left)--;
 255                 (*pages)++;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int echo_finalize_lb(struct obdo *oa, struct obd_ioobj *obj,
 262                             struct niobuf_remote *rb, int *pgs,
 263                             struct niobuf_local *lb, int verify)
 264 {
 265         struct niobuf_local *res = lb;
 266         u64 start = rb->rnb_offset >> PAGE_SHIFT;
 267         u64 end   = (rb->rnb_offset + rb->rnb_len + PAGE_SIZE - 1) >>
 268                     PAGE_SHIFT;
 269         int     count  = (int)(end - start);
 270         int     rc     = 0;
 271         int     i;
 272
 273         for (i = 0; i < count; i++, (*pgs) ++, res++) {
 274                 struct page *page = res->lnb_page;
 275                 void       *addr;
 276
 277                 if (!page) {
 278                         CERROR("null page objid %llu:%p, buf %d/%d\n",
 279                                ostid_id(&obj->ioo_oid), page, i,
 280                                obj->ioo_bufcnt);
 281                         return -EFAULT;
 282                 }
 283
 284                 addr = kmap(page);
 285
 286                 CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@%llu\n",
 287                        res->lnb_page, addr, res->lnb_file_offset);
 288
 289                 if (verify) {
 290                         int vrc = echo_page_debug_check(page,
 291                                                         ostid_id(&obj->ioo_oid),
 292                                                         res->lnb_file_offset,
 293                                                         res->lnb_len);
 294                         /* check all the pages always */
 295                         if (vrc != 0 && rc == 0)
 296                                 rc = vrc;
 297                 }
 298
 299                 kunmap(page);
 300                 /* NB see comment above regarding persistent pages */
 301                 __free_page(page);
 302         }
 303
 304         return rc;
 305 }
 306
 307 static int echo_preprw(const struct lu_env *env, int cmd,
 308                        struct obd_export *export, struct obdo *oa,
 309                        int objcount, struct obd_ioobj *obj,
 310                        struct niobuf_remote *nb, int *pages,
 311                        struct niobuf_local *res)
 312 {
 313         struct obd_device *obd;
 314         int tot_bytes = 0;
 315         int rc = 0;
 316         int i, left;
 317
 318         ENTRY;
 319
 320         obd = export->exp_obd;
 321         if (!obd)
 322                 RETURN(-EINVAL);
 323
 324         /* Temp fix to stop falling foul of osc_announce_cached() */
 325         oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
 326
 327         memset(res, 0, sizeof(*res) * *pages);
 328
 329         CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
 330                cmd == OBD_BRW_READ ? "reading" : "writing", objcount, *pages);
 331
 332         left = *pages;
 333         *pages = 0;
 334
 335         for (i = 0; i < objcount; i++, obj++) {
 336                 int j;
 337
 338                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++) {
 339                         rc = echo_map_nb_to_lb(oa, obj, nb, pages,
 340                                                res + *pages, cmd, &left);
 341                         if (rc)
 342                                 GOTO(preprw_cleanup, rc);
 343
 344                         tot_bytes += nb->rnb_len;
 345                 }
 346         }
 347
 348         atomic_add(*pages, &obd2echo(obd)->eo_prep);
 349
 350         if (cmd & OBD_BRW_READ)
 351                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 352                                     tot_bytes);
 353         else
 354                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 355                                     tot_bytes);
 356
 357         CDEBUG(D_PAGE, "%d pages allocated after prep\n",
 358                atomic_read(&obd2echo(obd)->eo_prep));
 359
 360         RETURN(0);
 361
 362 preprw_cleanup:
 363         /*
 364          * It is possible that we would rather handle errors by  allow
 365          * any already-set-up pages to complete, rather than tearing them
 366          * all down again.  I believe that this is what the in-kernel
 367          * prep/commit operations do.
 368          */
 369         CERROR("cleaning up %u pages (%d obdos)\n", *pages, objcount);
 370         for (i = 0; i < *pages; i++) {
 371                 kunmap(res[i].lnb_page);
 372                 /*
 373                  * NB if this is a persistent page, __free_page() will just
 374                  * lose the extra ref gained above
 375                  */
 376                 __free_page(res[i].lnb_page);
 377                 res[i].lnb_page = NULL;
 378                 atomic_dec(&obd2echo(obd)->eo_prep);
 379         }
 380
 381         return rc;
 382 }
 383
 384 static int echo_commitrw(const struct lu_env *env, int cmd,
 385                          struct obd_export *export, struct obdo *oa,
 386                          int objcount, struct obd_ioobj *obj,
 387                          struct niobuf_remote *rb, int niocount,
 388                          struct niobuf_local *res, int rc, int nob,
 389                          ktime_t kstart)
 390 {
 391         struct obd_device *obd;
 392         int pgs = 0;
 393         int i;
 394
 395         ENTRY;
 396
 397         obd = export->exp_obd;
 398         if (!obd)
 399                 RETURN(-EINVAL);
 400
 401         if (rc)
 402                 GOTO(commitrw_cleanup, rc);
 403
 404         if (cmd == OBD_BRW_READ) {
 405                 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
 406                        objcount, niocount);
 407         } else {
 408                 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
 409                        objcount, niocount);
 410         }
 411
 412         if (niocount && !res) {
 413                 CERROR("NULL res niobuf with niocount %d\n", niocount);
 414                 RETURN(-EINVAL);
 415         }
 416
 417         for (i = 0; i < objcount; i++, obj++) {
 418                 int verify = (rc == 0 &&
 419                              ostid_id(&obj->ioo_oid) != ECHO_PERSISTENT_OBJID &&
 420                               (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 421                               (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 422                 int j;
 423
 424                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, rb++) {
 425                         int vrc = echo_finalize_lb(oa, obj, rb, &pgs, &res[pgs],
 426                                                    verify);
 427                         if (vrc == 0)
 428                                 continue;
 429
 430                         if (vrc == -EFAULT)
 431                                 GOTO(commitrw_cleanup, rc = vrc);
 432
 433                         if (rc == 0)
 434                                 rc = vrc;
 435                 }
 436         }
 437
 438         atomic_sub(pgs, &obd2echo(obd)->eo_prep);
 439
 440         CDEBUG(D_PAGE, "%d pages remain after commit\n",
 441                atomic_read(&obd2echo(obd)->eo_prep));
 442         RETURN(rc);
 443
 444 commitrw_cleanup:
 445         atomic_sub(pgs, &obd2echo(obd)->eo_prep);
 446
 447         CERROR("cleaning up %d pages (%d obdos)\n",
 448                niocount - pgs - 1, objcount);
 449
 450         while (pgs < niocount) {
 451                 struct page *page = res[pgs++].lnb_page;
 452
 453                 if (!page)
 454                         continue;
 455
 456                 /* NB see comment above regarding persistent pages */
 457                 __free_page(page);
 458                 atomic_dec(&obd2echo(obd)->eo_prep);
 459         }
 460         return rc;
 461 }
 462
 463 LPROC_SEQ_FOPS_RO_TYPE(echo, uuid);
 464 static struct lprocfs_vars lprocfs_echo_obd_vars[] = {
 465         { .name =       "uuid",
 466           .fops =       &echo_uuid_fops         },
 467         { NULL }
 468 };
 469
 470 const struct obd_ops echo_obd_ops = {
 471         .o_owner           = THIS_MODULE,
 472         .o_connect         = echo_connect,
 473         .o_disconnect      = echo_disconnect,
 474         .o_init_export     = echo_init_export,
 475         .o_destroy_export  = echo_destroy_export,
 476         .o_preprw          = echo_preprw,
 477         .o_commitrw        = echo_commitrw,
 478 };
 479
 480 /**
 481  * Echo Server request handler for OST_CREATE RPC.
 482  *
 483  * This is part of request processing. Its simulates the object
 484  * creation on OST.
 485  *
 486  * \param[in] tsi       target session environment for this request
 487  *
 488  * \retval              0 if successful
 489  * \retval              negative value on error
 490  */
 491 static int esd_create_hdl(struct tgt_session_info *tsi)
 492 {
 493         const struct obdo *oa = &tsi->tsi_ost_body->oa;
 494         struct obd_device *obd = tsi->tsi_exp->exp_obd;
 495         struct ost_body *repbody;
 496         struct obdo *rep_oa;
 497
 498         ENTRY;
 499
 500         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
 501         if (!repbody)
 502                 RETURN(-ENOMEM);
 503
 504         if (!(oa->o_mode & S_IFMT)) {
 505                 CERROR("%s: no type is set in obdo!\n",
 506                        tsi->tsi_exp->exp_obd->obd_name);
 507                 RETURN(-ENOENT);
 508         }
 509
 510         if (!(oa->o_valid & OBD_MD_FLTYPE)) {
 511                 CERROR("%s: invalid o_valid in obdo: %#llx\n",
 512                        tsi->tsi_exp->exp_obd->obd_name, oa->o_valid);
 513                 RETURN(-EINVAL);
 514         }
 515
 516         rep_oa = &repbody->oa;
 517
 518         if (!fid_seq_is_echo(ostid_seq(&oa->o_oi))) {
 519                 CERROR("%s: invalid seq %#llx\n",
 520                        tsi->tsi_exp->exp_obd->obd_name, ostid_seq(&oa->o_oi));
 521                 return -EINVAL;
 522         }
 523
 524         ostid_set_seq_echo(&rep_oa->o_oi);
 525         ostid_set_id(&rep_oa->o_oi, echo_next_id(obd));
 526
 527         CDEBUG(D_INFO, "%s: Create object "DOSTID"\n",
 528                tsi->tsi_exp->exp_obd->obd_name, POSTID(&rep_oa->o_oi));
 529
 530         rep_oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
 531
 532         RETURN(0);
 533 }
 534
 535 /**
 536  * Echo Server request handler for OST_DESTROY RPC.
 537  *
 538  * This is Echo Server part of request handling. It simulates the objects
 539  * destroy on OST.
 540  *
 541  * \param[in] tsi       target session environment for this request
 542  *
 543  * \retval              0 if successful
 544  * \retval              negative value on error
 545  */
 546 static int esd_destroy_hdl(struct tgt_session_info *tsi)
 547 {
 548         const struct obdo *oa = &tsi->tsi_ost_body->oa;
 549         struct obd_device *obd = tsi->tsi_exp->exp_obd;
 550         struct ost_body *repbody;
 551         u64 oid;
 552
 553         ENTRY;
 554
 555         oid = ostid_id(&oa->o_oi);
 556         LASSERT(oid != 0);
 557
 558         if (!(oa->o_valid & OBD_MD_FLID)) {
 559                 CERROR("%s: obdo missing FLID valid flag: %#llx\n",
 560                        tsi->tsi_exp->exp_obd->obd_name, oa->o_valid);
 561                 RETURN(-EINVAL);
 562         }
 563
 564         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
 565
 566         if (ostid_id(&oa->o_oi) > obd2echo(obd)->eo_lastino ||
 567             ostid_id(&oa->o_oi) < ECHO_INIT_OID) {
 568                 CERROR("%s: bad objid to destroy: "DOSTID"\n",
 569                        tsi->tsi_exp->exp_obd->obd_name, POSTID(&oa->o_oi));
 570                 RETURN(-EINVAL);
 571         }
 572
 573         CDEBUG(D_INFO, "%s: Destroy object "DOSTID"\n",
 574                tsi->tsi_exp->exp_obd->obd_name, POSTID(&oa->o_oi));
 575
 576         repbody->oa.o_oi = oa->o_oi;
 577         RETURN(0);
 578 }
 579
 580 /**
 581  * Echo Server request handler for OST_GETATTR RPC.
 582  *
 583  * This is Echo Server part of request handling. It returns an object
 584  * attributes to the client. All objects have the same attributes in
 585  * Echo Server.
 586  *
 587  * \param[in] tsi       target session environment for this request
 588  *
 589  * \retval              0 if successful
 590  * \retval              negative value on error
 591  */
 592 static int esd_getattr_hdl(struct tgt_session_info *tsi)
 593 {
 594         const struct obdo *oa = &tsi->tsi_ost_body->oa;
 595         struct obd_device *obd = tsi->tsi_exp->exp_obd;
 596         struct ost_body *repbody;
 597
 598         ENTRY;
 599
 600         if (!(oa->o_valid & OBD_MD_FLID)) {
 601                 CERROR("%s: obdo missing FLID valid flag: %#llx\n",
 602                        tsi->tsi_exp->exp_obd->obd_name, oa->o_valid);
 603                 RETURN(-EINVAL);
 604         }
 605
 606         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
 607         if (!repbody)
 608                 RETURN(-ENOMEM);
 609
 610         repbody->oa.o_oi = oa->o_oi;
 611         repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
 612
 613         obdo_cpy_md(&repbody->oa, &obd2echo(obd)->eo_oa, oa->o_valid);
 614
 615         repbody->oa.o_valid |= OBD_MD_FLFLAGS;
 616         repbody->oa.o_flags = OBD_FL_FLUSH;
 617
 618         RETURN(0);
 619 }
 620
 621 /**
 622  * Echo Server request handler for OST_SETATTR RPC.
 623  *
 624  * This is Echo Server part of request handling. It sets common
 625  * attributes from request to the Echo Server objects.
 626  *
 627  * \param[in] tsi       target session environment for this request
 628  *
 629  * \retval              0 if successful
 630  * \retval              negative value on error
 631  */
 632 static int esd_setattr_hdl(struct tgt_session_info *tsi)
 633 {
 634         struct ost_body *body = tsi->tsi_ost_body;
 635         struct obd_device *obd = tsi->tsi_exp->exp_obd;
 636         struct ost_body *repbody;
 637
 638         ENTRY;
 639
 640         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 641                 CERROR("%s: obdo missing FLID valid flag: %#llx\n",
 642                        tsi->tsi_exp->exp_obd->obd_name,
 643                        body->oa.o_valid);
 644                 RETURN(-EINVAL);
 645         }
 646
 647         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
 648         if (!repbody)
 649                 RETURN(-ENOMEM);
 650
 651         repbody->oa.o_oi = body->oa.o_oi;
 652         repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
 653
 654         obd2echo(obd)->eo_oa = body->oa;
 655
 656         RETURN(0);
 657 }
 658
 659 #define OBD_FAIL_OST_READ_NET   OBD_FAIL_OST_BRW_NET
 660 #define OBD_FAIL_OST_WRITE_NET  OBD_FAIL_OST_BRW_NET
 661 #define OST_BRW_READ    OST_READ
 662 #define OST_BRW_WRITE   OST_WRITE
 663
 664 /**
 665  * Table of Echo Server specific request handlers
 666  *
 667  * This table contains all opcodes accepted by Echo Server and
 668  * specifies handlers for them. The tgt_request_handler()
 669  * uses such table from each target to process incoming
 670  * requests.
 671  */
 672 static struct tgt_handler esd_tgt_handlers[] = {
 673 TGT_RPC_HANDLER(OST_FIRST_OPC, 0, OST_CONNECT, tgt_connect,
 674                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
 675 TGT_RPC_HANDLER(OST_FIRST_OPC, 0, OST_DISCONNECT, tgt_disconnect,
 676                 &RQF_OST_DISCONNECT, LUSTRE_OBD_VERSION),
 677 TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_GETATTR, esd_getattr_hdl),
 678 TGT_OST_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, OST_SETATTR,
 679             esd_setattr_hdl),
 680 TGT_OST_HDL(HAS_REPLY | IS_MUTABLE, OST_CREATE, esd_create_hdl),
 681 TGT_OST_HDL(HAS_REPLY | IS_MUTABLE, OST_DESTROY, esd_destroy_hdl),
 682 TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_BRW_READ, tgt_brw_read),
 683 TGT_OST_HDL(HAS_BODY | IS_MUTABLE, OST_BRW_WRITE, tgt_brw_write),
 684 };
 685
 686 static struct tgt_opc_slice esd_common_slice[] = {
 687         {
 688                 .tos_opc_start  = OST_FIRST_OPC,
 689                 .tos_opc_end    = OST_LAST_OPC,
 690                 .tos_hs         = esd_tgt_handlers
 691         },
 692         {
 693                 .tos_opc_start  = OBD_FIRST_OPC,
 694                 .tos_opc_end    = OBD_LAST_OPC,
 695                 .tos_hs         = tgt_obd_handlers
 696         },
 697         {
 698                 .tos_opc_start  = LDLM_FIRST_OPC,
 699                 .tos_opc_end    = LDLM_LAST_OPC,
 700                 .tos_hs         = tgt_dlm_handlers
 701         },
 702         {
 703                 .tos_opc_start  = SEC_FIRST_OPC,
 704                 .tos_opc_end    = SEC_LAST_OPC,
 705                 .tos_hs         = tgt_sec_ctx_handlers
 706         },
 707         {
 708                 .tos_hs         = NULL
 709         }
 710 };
 711
 712 /**
 713  * lu_device_operations matrix for ECHO SRV device is NULL,
 714  * this device is just serving incoming requests immediately
 715  * without building a stack of lu_devices.
 716  */
 717 static const struct lu_device_operations echo_srv_lu_ops = { 0 };
 718
 719 /**
 720  * Initialize Echo Server device with parameters in the config log \a cfg.
 721  *
 722  * This is the main starting point of Echo Server initialization. It fills all
 723  * parameters with their initial values and starts Echo Server.
 724  *
 725  * \param[in] env       execution environment
 726  * \param[in] m         Echo Server device
 727  * \param[in] ldt       LU device type of Echo Server
 728  * \param[in] cfg       configuration log
 729  *
 730  * \retval              0 if successful
 731  * \retval              negative value on error
 732  */
 733 static int echo_srv_init0(const struct lu_env *env,
 734                           struct echo_srv_device *esd,
 735                           struct lu_device_type *ldt, struct lustre_cfg *cfg)
 736 {
 737         const char *dev = lustre_cfg_string(cfg, 0);
 738         struct obd_device *obd;
 739         char ns_name[48];
 740         int rc;
 741
 742         ENTRY;
 743
 744         obd = class_name2obd(dev);
 745         if (!obd) {
 746                 CERROR("Cannot find obd with name %s\n", dev);
 747                 RETURN(-ENODEV);
 748         }
 749
 750         spin_lock_init(&obd2echo(obd)->eo_lock);
 751         obd2echo(obd)->eo_lastino = ECHO_INIT_OID;
 752
 753         esd->esd_dev.ld_ops = &echo_srv_lu_ops;
 754         esd->esd_dev.ld_obd = obd;
 755         /* set this lu_device to obd, because error handling need it */
 756         obd->obd_lu_dev = &esd->esd_dev;
 757
 758         /* No connection accepted until configurations will finish */
 759         spin_lock(&obd->obd_dev_lock);
 760         obd->obd_no_conn = 1;
 761         spin_unlock(&obd->obd_dev_lock);
 762
 763         /* non-replayable target */
 764         obd->obd_replayable = 0;
 765
 766         snprintf(ns_name, sizeof(ns_name), "echotgt-%s", obd->obd_uuid.uuid);
 767         obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
 768                                                 LDLM_NAMESPACE_SERVER,
 769                                                 LDLM_NAMESPACE_MODEST,
 770                                                 LDLM_NS_TYPE_OST);
 771         if (IS_ERR(obd->obd_namespace)) {
 772                 rc = PTR_ERR(obd->obd_namespace);
 773                 CERROR("%s: unable to create server namespace: rc = %d\n",
 774                        obd->obd_name, rc);
 775                 obd->obd_namespace = NULL;
 776                 RETURN(rc);
 777         }
 778
 779         obd->obd_vars = lprocfs_echo_obd_vars;
 780         if (!lprocfs_obd_setup(obd, true) &&
 781             lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
 782                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 783                                      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
 784                                      "read_bytes");
 785                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 786                                      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
 787                                      "write_bytes");
 788         }
 789
 790         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
 791                            "echo_ldlm_cb_client", &obd->obd_ldlm_client);
 792
 793         rc = tgt_init(env, &esd->esd_lut, obd, NULL, esd_common_slice,
 794                       OBD_FAIL_OST_ALL_REQUEST_NET,
 795                       OBD_FAIL_OST_ALL_REPLY_NET);
 796         if (rc)
 797                 GOTO(err_out, rc);
 798
 799         spin_lock(&obd->obd_dev_lock);
 800         obd->obd_no_conn = 0;
 801         spin_unlock(&obd->obd_dev_lock);
 802
 803         RETURN(0);
 804
 805 err_out:
 806         ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
 807         obd->obd_namespace = NULL;
 808
 809         lprocfs_obd_cleanup(obd);
 810         lprocfs_free_obd_stats(obd);
 811         RETURN(rc);
 812 }
 813
 814 /**
 815  * Stop the Echo Server device.
 816  *
 817  * This function stops the Echo Server device and all its subsystems.
 818  * This is the end of Echo Server lifecycle.
 819  *
 820  * \param[in] env       execution environment
 821  * \param[in] esd               ESD device
 822  */
 823 static void echo_srv_fini(const struct lu_env *env,
 824                           struct echo_srv_device *esd)
 825 {
 826         struct obd_device *obd = echo_srv_obd(esd);
 827         struct lu_device *d = &esd->esd_dev;
 828         int leaked;
 829
 830         ENTRY;
 831
 832         class_disconnect_exports(obd);
 833         if (obd->obd_namespace)
 834                 ldlm_namespace_free_prior(obd->obd_namespace, NULL,
 835                                           obd->obd_force);
 836
 837         obd_exports_barrier(obd);
 838         obd_zombie_barrier();
 839
 840         tgt_fini(env, &esd->esd_lut);
 841
 842         if (obd->obd_namespace) {
 843                 ldlm_namespace_free_post(obd->obd_namespace);
 844                 obd->obd_namespace = NULL;
 845         }
 846
 847         lprocfs_obd_cleanup(obd);
 848         lprocfs_free_obd_stats(obd);
 849
 850         leaked = atomic_read(&obd2echo(obd)->eo_prep);
 851         if (leaked != 0)
 852                 CERROR("%d prep/commitrw pages leaked\n", leaked);
 853
 854         LASSERT(atomic_read(&d->ld_ref) == 0);
 855         EXIT;
 856 }
 857
 858 /**
 859  * Implementation of lu_device_type_operations::ldto_device_fini.
 860  *
 861  * Finalize device. Dual to echo_srv_device_init(). It is called from
 862  * obd_precleanup() and stops the current device.
 863  *
 864  * \param[in] env       execution environment
 865  * \param[in] d         LU device of ESD
 866  *
 867  * \retval              NULL
 868  */
 869 static struct lu_device *echo_srv_device_fini(const struct lu_env *env,
 870                                               struct lu_device *d)
 871 {
 872         ENTRY;
 873         echo_srv_fini(env, echo_srv_dev(d));
 874         RETURN(NULL);
 875 }
 876
 877 /**
 878  * Implementation of lu_device_type_operations::ldto_device_free.
 879  *
 880  * Free Echo Server device. Dual to echo_srv_device_alloc().
 881  *
 882  * \param[in] env       execution environment
 883  * \param[in] d         LU device of ESD
 884  *
 885  * \retval              NULL
 886  */
 887 static struct lu_device *echo_srv_device_free(const struct lu_env *env,
 888                                               struct lu_device *d)
 889 {
 890         struct echo_srv_device *esd = echo_srv_dev(d);
 891
 892         lu_device_fini(&esd->esd_dev);
 893         OBD_FREE_PTR(esd);
 894         RETURN(NULL);
 895 }
 896
 897 /**
 898  * Implementation of lu_device_type_operations::ldto_device_alloc.
 899  *
 900  * This function allocates the new Echo Server device. It is called from
 901  * obd_setup() if OBD device had lu_device_type defined.
 902  *
 903  * \param[in] env       execution environment
 904  * \param[in] t         lu_device_type of ESD device
 905  * \param[in] cfg       configuration log
 906  *
 907  * \retval              pointer to the lu_device of just allocated OFD
 908  * \retval              ERR_PTR of return value on error
 909  */
 910 static struct lu_device *echo_srv_device_alloc(const struct lu_env *env,
 911                                                struct lu_device_type *t,
 912                                                struct lustre_cfg *cfg)
 913 {
 914         struct echo_srv_device *esd;
 915         struct lu_device *l;
 916         int rc;
 917
 918         OBD_ALLOC_PTR(esd);
 919         if (!esd)
 920                 return ERR_PTR(-ENOMEM);
 921
 922         l = &esd->esd_dev;
 923         lu_device_init(l, t);
 924         rc = echo_srv_init0(env, esd, t, cfg);
 925         if (rc != 0) {
 926                 echo_srv_device_free(env, l);
 927                 l = ERR_PTR(rc);
 928         }
 929
 930         return l;
 931 }
 932
 933 static const struct lu_device_type_operations echo_srv_type_ops = {
 934         .ldto_device_alloc = echo_srv_device_alloc,
 935         .ldto_device_free = echo_srv_device_free,
 936         .ldto_device_fini = echo_srv_device_fini
 937 };
 938
 939 struct lu_device_type echo_srv_type = {
 940         .ldt_tags = LU_DEVICE_DT,
 941         .ldt_name = LUSTRE_ECHO_NAME,
 942         .ldt_ops = &echo_srv_type_ops,
 943         .ldt_ctx_tags = LCT_DT_THREAD,
 944 };
 945
 946 void echo_persistent_pages_fini(void)
 947 {
 948         int i;
 949
 950         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
 951                 if (echo_persistent_pages[i]) {
 952                         __free_page(echo_persistent_pages[i]);
 953                         echo_persistent_pages[i] = NULL;
 954                 }
 955 }
 956
 957 int echo_persistent_pages_init(void)
 958 {
 959         struct page *pg;
 960         int          i;
 961
 962         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
 963                 gfp_t gfp_mask = (i < ECHO_PERSISTENT_PAGES / 2) ?
 964                         GFP_KERNEL : GFP_HIGHUSER;
 965
 966                 pg = alloc_page(gfp_mask);
 967                 if (!pg) {
 968                         echo_persistent_pages_fini();
 969                         return -ENOMEM;
 970                 }
 971
 972                 memset(kmap(pg), 0, PAGE_SIZE);
 973                 kunmap(pg);
 974                 /* set mapping so page is not considered encrypted */
 975                 pg->mapping = ECHO_MAPPING_UNENCRYPTED;
 976
 977                 echo_persistent_pages[i] = pg;
 978         }
 979
 980         return 0;
 981 }