lustre/mdc/mdc_locks.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_MDC
  41
  42 #ifdef __KERNEL__
  43 # include <linux/module.h>
  44 # include <linux/pagemap.h>
  45 # include <linux/miscdevice.h>
  46 # include <linux/init.h>
  47 #else
  48 # include <liblustre.h>
  49 #endif
  50
  51 #include <lustre_acl.h>
  52 #include <obd_class.h>
  53 #include <lustre_dlm.h>
  54 /* fid_res_name_eq() */
  55 #include <lustre_fid.h>
  56 #include <lprocfs_status.h>
  57 #include "mdc_internal.h"
  58
  59 struct mdc_getattr_args {
  60         struct obd_export           *ga_exp;
  61         struct md_enqueue_info      *ga_minfo;
  62         struct ldlm_enqueue_info    *ga_einfo;
  63 };
  64
  65 int it_disposition(struct lookup_intent *it, int flag)
  66 {
  67         return it->d.lustre.it_disposition & flag;
  68 }
  69 EXPORT_SYMBOL(it_disposition);
  70
  71 void it_set_disposition(struct lookup_intent *it, int flag)
  72 {
  73         it->d.lustre.it_disposition |= flag;
  74 }
  75 EXPORT_SYMBOL(it_set_disposition);
  76
  77 void it_clear_disposition(struct lookup_intent *it, int flag)
  78 {
  79         it->d.lustre.it_disposition &= ~flag;
  80 }
  81 EXPORT_SYMBOL(it_clear_disposition);
  82
  83 int it_open_error(int phase, struct lookup_intent *it)
  84 {
  85         if (it_disposition(it, DISP_OPEN_OPEN)) {
  86                 if (phase >= DISP_OPEN_OPEN)
  87                         return it->d.lustre.it_status;
  88                 else
  89                         return 0;
  90         }
  91
  92         if (it_disposition(it, DISP_OPEN_CREATE)) {
  93                 if (phase >= DISP_OPEN_CREATE)
  94                         return it->d.lustre.it_status;
  95                 else
  96                         return 0;
  97         }
  98
  99         if (it_disposition(it, DISP_LOOKUP_EXECD)) {
 100                 if (phase >= DISP_LOOKUP_EXECD)
 101                         return it->d.lustre.it_status;
 102                 else
 103                         return 0;
 104         }
 105
 106         if (it_disposition(it, DISP_IT_EXECD)) {
 107                 if (phase >= DISP_IT_EXECD)
 108                         return it->d.lustre.it_status;
 109                 else
 110                         return 0;
 111         }
 112         CERROR("it disp: %X, status: %d\n", it->d.lustre.it_disposition,
 113                it->d.lustre.it_status);
 114         LBUG();
 115         return 0;
 116 }
 117 EXPORT_SYMBOL(it_open_error);
 118
 119 /* this must be called on a lockh that is known to have a referenced lock */
 120 int mdc_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
 121                       __u32 *bits)
 122 {
 123         struct ldlm_lock *lock;
 124         ENTRY;
 125
 126         if(bits)
 127                 *bits = 0;
 128
 129         if (!*lockh) {
 130                 EXIT;
 131                 RETURN(0);
 132         }
 133
 134         lock = ldlm_handle2lock((struct lustre_handle *)lockh);
 135
 136         LASSERT(lock != NULL);
 137         lock_res_and_lock(lock);
 138 #ifdef __KERNEL__
 139         if (lock->l_ast_data && lock->l_ast_data != data) {
 140                 struct inode *new_inode = data;
 141                 struct inode *old_inode = lock->l_ast_data;
 142                 LASSERTF(old_inode->i_state & I_FREEING,
 143                          "Found existing inode %p/%lu/%u state %lu in lock: "
 144                          "setting data to %p/%lu/%u\n", old_inode,
 145                          old_inode->i_ino, old_inode->i_generation,
 146                          old_inode->i_state,
 147                          new_inode, new_inode->i_ino, new_inode->i_generation);
 148         }
 149 #endif
 150         lock->l_ast_data = data;
 151         if (bits)
 152                 *bits = lock->l_policy_data.l_inodebits.bits;
 153
 154         unlock_res_and_lock(lock);
 155         LDLM_LOCK_PUT(lock);
 156
 157         RETURN(0);
 158 }
 159
 160 ldlm_mode_t mdc_lock_match(struct obd_export *exp, int flags,
 161                            const struct lu_fid *fid, ldlm_type_t type,
 162                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
 163                            struct lustre_handle *lockh)
 164 {
 165         struct ldlm_res_id res_id;
 166         ldlm_mode_t rc;
 167         ENTRY;
 168
 169         fid_build_reg_res_name(fid, &res_id);
 170         rc = ldlm_lock_match(class_exp2obd(exp)->obd_namespace, flags,
 171                              &res_id, type, policy, mode, lockh, 0);
 172         RETURN(rc);
 173 }
 174
 175 int mdc_cancel_unused(struct obd_export *exp,
 176                       const struct lu_fid *fid,
 177                       ldlm_policy_data_t *policy,
 178                       ldlm_mode_t mode,
 179                       ldlm_cancel_flags_t flags,
 180                       void *opaque)
 181 {
 182         struct ldlm_res_id res_id;
 183         struct obd_device *obd = class_exp2obd(exp);
 184         int rc;
 185
 186         ENTRY;
 187
 188         fid_build_reg_res_name(fid, &res_id);
 189         rc = ldlm_cli_cancel_unused_resource(obd->obd_namespace, &res_id,
 190                                              policy, mode, flags, opaque);
 191         RETURN(rc);
 192 }
 193
 194 int mdc_change_cbdata(struct obd_export *exp,
 195                       const struct lu_fid *fid,
 196                       ldlm_iterator_t it, void *data)
 197 {
 198         struct ldlm_res_id res_id;
 199         ENTRY;
 200
 201         fid_build_reg_res_name(fid, &res_id);
 202         ldlm_resource_iterate(class_exp2obd(exp)->obd_namespace,
 203                               &res_id, it, data);
 204
 205         EXIT;
 206         return 0;
 207 }
 208
 209 /* find any ldlm lock of the inode in mdc
 210  * return 0    not find
 211  *        1    find one
 212  *      < 0    error */
 213 int mdc_find_cbdata(struct obd_export *exp,
 214                     const struct lu_fid *fid,
 215                     ldlm_iterator_t it, void *data)
 216 {
 217         struct ldlm_res_id res_id;
 218         int rc = 0;
 219         ENTRY;
 220
 221         fid_build_reg_res_name((struct lu_fid*)fid, &res_id);
 222         rc = ldlm_resource_iterate(class_exp2obd(exp)->obd_namespace, &res_id,
 223                                    it, data);
 224         if (rc == LDLM_ITER_STOP)
 225                 RETURN(1);
 226         else if (rc == LDLM_ITER_CONTINUE)
 227                 RETURN(0);
 228         RETURN(rc);
 229 }
 230
 231 static inline void mdc_clear_replay_flag(struct ptlrpc_request *req, int rc)
 232 {
 233         /* Don't hold error requests for replay. */
 234         if (req->rq_replay) {
 235                 cfs_spin_lock(&req->rq_lock);
 236                 req->rq_replay = 0;
 237                 cfs_spin_unlock(&req->rq_lock);
 238         }
 239         if (rc && req->rq_transno != 0) {
 240                 DEBUG_REQ(D_ERROR, req, "transno returned on error rc %d", rc);
 241                 LBUG();
 242         }
 243 }
 244
 245 /* Save a large LOV EA into the request buffer so that it is available
 246  * for replay.  We don't do this in the initial request because the
 247  * original request doesn't need this buffer (at most it sends just the
 248  * lov_mds_md) and it is a waste of RAM/bandwidth to send the empty
 249  * buffer and may also be difficult to allocate and save a very large
 250  * request buffer for each open. (bug 5707)
 251  *
 252  * OOM here may cause recovery failure if lmm is needed (only for the
 253  * original open if the MDS crashed just when this client also OOM'd)
 254  * but this is incredibly unlikely, and questionable whether the client
 255  * could do MDS recovery under OOM anyways... */
 256 static void mdc_realloc_openmsg(struct ptlrpc_request *req,
 257                                 struct mdt_body *body)
 258 {
 259         int     rc;
 260
 261         /* FIXME: remove this explicit offset. */
 262         rc = sptlrpc_cli_enlarge_reqbuf(req, DLM_INTENT_REC_OFF + 4,
 263                                         body->eadatasize);
 264         if (rc) {
 265                 CERROR("Can't enlarge segment %d size to %d\n",
 266                        DLM_INTENT_REC_OFF + 4, body->eadatasize);
 267                 body->valid &= ~OBD_MD_FLEASIZE;
 268                 body->eadatasize = 0;
 269         }
 270 }
 271
 272 static struct ptlrpc_request *mdc_intent_open_pack(struct obd_export *exp,
 273                                                    struct lookup_intent *it,
 274                                                    struct md_op_data *op_data,
 275                                                    void *lmm, int lmmsize,
 276                                                    void *cb_data)
 277 {
 278         struct ptlrpc_request *req;
 279         struct obd_device     *obddev = class_exp2obd(exp);
 280         struct ldlm_intent    *lit;
 281         CFS_LIST_HEAD(cancels);
 282         int                    count = 0;
 283         int                    mode;
 284         int                    rc;
 285         ENTRY;
 286
 287         it->it_create_mode = (it->it_create_mode & ~S_IFMT) | S_IFREG;
 288
 289         /* XXX: openlock is not cancelled for cross-refs. */
 290         /* If inode is known, cancel conflicting OPEN locks. */
 291         if (fid_is_sane(&op_data->op_fid2)) {
 292                 if (it->it_flags & (FMODE_WRITE|MDS_OPEN_TRUNC))
 293                         mode = LCK_CW;
 294 #ifdef FMODE_EXEC
 295                 else if (it->it_flags & FMODE_EXEC)
 296                         mode = LCK_PR;
 297 #endif
 298                 else
 299                         mode = LCK_CR;
 300                 count = mdc_resource_get_unused(exp, &op_data->op_fid2,
 301                                                 &cancels, mode,
 302                                                 MDS_INODELOCK_OPEN);
 303         }
 304
 305         /* If CREATE, cancel parent's UPDATE lock. */
 306         if (it->it_op & IT_CREAT)
 307                 mode = LCK_EX;
 308         else
 309                 mode = LCK_CR;
 310         count += mdc_resource_get_unused(exp, &op_data->op_fid1,
 311                                          &cancels, mode,
 312                                          MDS_INODELOCK_UPDATE);
 313
 314         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 315                                    &RQF_LDLM_INTENT_OPEN);
 316         if (req == NULL) {
 317                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 318                 RETURN(ERR_PTR(-ENOMEM));
 319         }
 320
 321         /* parent capability */
 322         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 323         /* child capability, reserve the size according to parent capa, it will
 324          * be filled after we get the reply */
 325         mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa1);
 326
 327         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 328                              op_data->op_namelen + 1);
 329         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 330                              max(lmmsize, obddev->u.cli.cl_default_mds_easize));
 331
 332         rc = ldlm_prep_enqueue_req(exp, req, &cancels, count);
 333         if (rc) {
 334                 ptlrpc_request_free(req);
 335                 return NULL;
 336         }
 337
 338         cfs_spin_lock(&req->rq_lock);
 339         req->rq_replay = req->rq_import->imp_replayable;
 340         cfs_spin_unlock(&req->rq_lock);
 341
 342         /* pack the intent */
 343         lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
 344         lit->opc = (__u64)it->it_op;
 345
 346         /* pack the intended request */
 347         mdc_open_pack(req, op_data, it->it_create_mode, 0, it->it_flags, lmm,
 348                       lmmsize);
 349
 350         /* for remote client, fetch remote perm for current user */
 351         if (client_is_remote(exp))
 352                 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 353                                      sizeof(struct mdt_remote_perm));
 354         ptlrpc_request_set_replen(req);
 355         return req;
 356 }
 357
 358 static struct ptlrpc_request *mdc_intent_unlink_pack(struct obd_export *exp,
 359                                                      struct lookup_intent *it,
 360                                                      struct md_op_data *op_data)
 361 {
 362         struct ptlrpc_request *req;
 363         struct obd_device     *obddev = class_exp2obd(exp);
 364         struct ldlm_intent    *lit;
 365         int                    rc;
 366         ENTRY;
 367
 368         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 369                                    &RQF_LDLM_INTENT_UNLINK);
 370         if (req == NULL)
 371                 RETURN(ERR_PTR(-ENOMEM));
 372
 373         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 374         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 375                              op_data->op_namelen + 1);
 376
 377         rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
 378         if (rc) {
 379                 ptlrpc_request_free(req);
 380                 RETURN(ERR_PTR(rc));
 381         }
 382
 383         /* pack the intent */
 384         lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
 385         lit->opc = (__u64)it->it_op;
 386
 387         /* pack the intended request */
 388         mdc_unlink_pack(req, op_data);
 389
 390         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 391                              obddev->u.cli.cl_max_mds_easize);
 392         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 393                              obddev->u.cli.cl_max_mds_cookiesize);
 394         ptlrpc_request_set_replen(req);
 395         RETURN(req);
 396 }
 397
 398 static struct ptlrpc_request *mdc_intent_getattr_pack(struct obd_export *exp,
 399                                                       struct lookup_intent *it,
 400                                                       struct md_op_data *op_data)
 401 {
 402         struct ptlrpc_request *req;
 403         struct obd_device     *obddev = class_exp2obd(exp);
 404         obd_valid              valid = OBD_MD_FLGETATTR | OBD_MD_FLEASIZE |
 405                                        OBD_MD_FLMODEASIZE | OBD_MD_FLDIREA |
 406                                        OBD_MD_FLMDSCAPA | OBD_MD_MEA |
 407                                        (client_is_remote(exp) ?
 408                                                OBD_MD_FLRMTPERM : OBD_MD_FLACL);
 409         struct ldlm_intent    *lit;
 410         int                    rc;
 411         ENTRY;
 412
 413         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 414                                    &RQF_LDLM_INTENT_GETATTR);
 415         if (req == NULL)
 416                 RETURN(ERR_PTR(-ENOMEM));
 417
 418         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 419         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 420                              op_data->op_namelen + 1);
 421
 422         rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
 423         if (rc) {
 424                 ptlrpc_request_free(req);
 425                 RETURN(ERR_PTR(rc));
 426         }
 427
 428         /* pack the intent */
 429         lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
 430         lit->opc = (__u64)it->it_op;
 431
 432         /* pack the intended request */
 433         mdc_getattr_pack(req, valid, it->it_flags, op_data,
 434                          obddev->u.cli.cl_max_mds_easize);
 435
 436         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 437                              obddev->u.cli.cl_max_mds_easize);
 438         if (client_is_remote(exp))
 439                 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 440                                      sizeof(struct mdt_remote_perm));
 441         ptlrpc_request_set_replen(req);
 442         RETURN(req);
 443 }
 444
 445 static struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp)
 446 {
 447         struct ptlrpc_request *req;
 448         int rc;
 449         ENTRY;
 450
 451         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LDLM_ENQUEUE);
 452         if (req == NULL)
 453                 RETURN(ERR_PTR(-ENOMEM));
 454
 455         rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
 456         if (rc) {
 457                 ptlrpc_request_free(req);
 458                 RETURN(ERR_PTR(rc));
 459         }
 460
 461         ptlrpc_request_set_replen(req);
 462         RETURN(req);
 463 }
 464
 465 static int mdc_finish_enqueue(struct obd_export *exp,
 466                               struct ptlrpc_request *req,
 467                               struct ldlm_enqueue_info *einfo,
 468                               struct lookup_intent *it,
 469                               struct lustre_handle *lockh,
 470                               int rc)
 471 {
 472         struct req_capsule  *pill = &req->rq_pill;
 473         struct ldlm_request *lockreq;
 474         struct ldlm_reply   *lockrep;
 475         ENTRY;
 476
 477         LASSERT(rc >= 0);
 478         /* Similarly, if we're going to replay this request, we don't want to
 479          * actually get a lock, just perform the intent. */
 480         if (req->rq_transno || req->rq_replay) {
 481                 lockreq = req_capsule_client_get(pill, &RMF_DLM_REQ);
 482                 lockreq->lock_flags |= LDLM_FL_INTENT_ONLY;
 483         }
 484
 485         if (rc == ELDLM_LOCK_ABORTED) {
 486                 einfo->ei_mode = 0;
 487                 memset(lockh, 0, sizeof(*lockh));
 488                 rc = 0;
 489         } else { /* rc = 0 */
 490                 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
 491                 LASSERT(lock);
 492
 493                 /* If the server gave us back a different lock mode, we should
 494                  * fix up our variables. */
 495                 if (lock->l_req_mode != einfo->ei_mode) {
 496                         ldlm_lock_addref(lockh, lock->l_req_mode);
 497                         ldlm_lock_decref(lockh, einfo->ei_mode);
 498                         einfo->ei_mode = lock->l_req_mode;
 499                 }
 500                 LDLM_LOCK_PUT(lock);
 501         }
 502
 503         lockrep = req_capsule_server_get(pill, &RMF_DLM_REP);
 504         LASSERT(lockrep != NULL);                 /* checked by ldlm_cli_enqueue() */
 505
 506         it->d.lustre.it_disposition = (int)lockrep->lock_policy_res1;
 507         it->d.lustre.it_status = (int)lockrep->lock_policy_res2;
 508         it->d.lustre.it_lock_mode = einfo->ei_mode;
 509         it->d.lustre.it_lock_handle = lockh->cookie;
 510         it->d.lustre.it_data = req;
 511
 512         if (it->d.lustre.it_status < 0 && req->rq_replay)
 513                 mdc_clear_replay_flag(req, it->d.lustre.it_status);
 514
 515         /* If we're doing an IT_OPEN which did not result in an actual
 516          * successful open, then we need to remove the bit which saves
 517          * this request for unconditional replay.
 518          *
 519          * It's important that we do this first!  Otherwise we might exit the
 520          * function without doing so, and try to replay a failed create
 521          * (bug 3440) */
 522         if (it->it_op & IT_OPEN && req->rq_replay &&
 523             (!it_disposition(it, DISP_OPEN_OPEN) ||it->d.lustre.it_status != 0))
 524                 mdc_clear_replay_flag(req, it->d.lustre.it_status);
 525
 526         DEBUG_REQ(D_RPCTRACE, req, "op: %d disposition: %x, status: %d",
 527                   it->it_op,it->d.lustre.it_disposition,it->d.lustre.it_status);
 528
 529         /* We know what to expect, so we do any byte flipping required here */
 530         if (it->it_op & (IT_OPEN | IT_UNLINK | IT_LOOKUP | IT_GETATTR)) {
 531                 struct mdt_body *body;
 532
 533                 body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 534                 if (body == NULL) {
 535                         CERROR ("Can't swab mdt_body\n");
 536                         RETURN (-EPROTO);
 537                 }
 538
 539                 if (it_disposition(it, DISP_OPEN_OPEN) &&
 540                     !it_open_error(DISP_OPEN_OPEN, it)) {
 541                         /*
 542                          * If this is a successful OPEN request, we need to set
 543                          * replay handler and data early, so that if replay
 544                          * happens immediately after swabbing below, new reply
 545                          * is swabbed by that handler correctly.
 546                          */
 547                         mdc_set_open_replay_data(NULL, NULL, req);
 548                 }
 549
 550                 if ((body->valid & (OBD_MD_FLDIREA | OBD_MD_FLEASIZE)) != 0) {
 551                         void *eadata;
 552
 553                          mdc_update_max_ea_from_body(exp, body);
 554
 555                         /*
 556                          * The eadata is opaque; just check that it is there.
 557                          * Eventually, obd_unpackmd() will check the contents.
 558                          */
 559                         eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 560                                                               body->eadatasize);
 561                         if (eadata == NULL)
 562                                 RETURN(-EPROTO);
 563
 564                         /*
 565                          * We save the reply LOV EA in case we have to replay a
 566                          * create for recovery.  If we didn't allocate a large
 567                          * enough request buffer above we need to reallocate it
 568                          * here to hold the actual LOV EA.
 569                          *
 570                          * To not save LOV EA if request is not going to replay
 571                          * (for example error one).
 572                          */
 573                         if ((it->it_op & IT_OPEN) && req->rq_replay) {
 574                                 void *lmm;
 575                                 if (req_capsule_get_size(pill, &RMF_EADATA,
 576                                                          RCL_CLIENT) <
 577                                     body->eadatasize)
 578                                         mdc_realloc_openmsg(req, body);
 579                                 else
 580                                         req_capsule_shrink(pill, &RMF_EADATA,
 581                                                            body->eadatasize,
 582                                                            RCL_CLIENT);
 583
 584                                 req_capsule_set_size(pill, &RMF_EADATA,
 585                                                      RCL_CLIENT,
 586                                                      body->eadatasize);
 587
 588                                 lmm = req_capsule_client_get(pill, &RMF_EADATA);
 589                                 if (lmm)
 590                                         memcpy(lmm, eadata, body->eadatasize);
 591                         }
 592                 }
 593
 594                 if (body->valid & OBD_MD_FLRMTPERM) {
 595                         struct mdt_remote_perm *perm;
 596
 597                         LASSERT(client_is_remote(exp));
 598                         perm = req_capsule_server_swab_get(pill, &RMF_ACL,
 599                                                 lustre_swab_mdt_remote_perm);
 600                         if (perm == NULL)
 601                                 RETURN(-EPROTO);
 602                 }
 603                 if (body->valid & OBD_MD_FLMDSCAPA) {
 604                         struct lustre_capa *capa, *p;
 605
 606                         capa = req_capsule_server_get(pill, &RMF_CAPA1);
 607                         if (capa == NULL)
 608                                 RETURN(-EPROTO);
 609
 610                         if (it->it_op & IT_OPEN) {
 611                                 /* client fid capa will be checked in replay */
 612                                 p = req_capsule_client_get(pill, &RMF_CAPA2);
 613                                 LASSERT(p);
 614                                 *p = *capa;
 615                         }
 616                 }
 617                 if (body->valid & OBD_MD_FLOSSCAPA) {
 618                         struct lustre_capa *capa;
 619
 620                         capa = req_capsule_server_get(pill, &RMF_CAPA2);
 621                         if (capa == NULL)
 622                                 RETURN(-EPROTO);
 623                 }
 624         }
 625
 626         RETURN(rc);
 627 }
 628
 629 /* We always reserve enough space in the reply packet for a stripe MD, because
 630  * we don't know in advance the file type. */
 631 int mdc_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
 632                 struct lookup_intent *it, struct md_op_data *op_data,
 633                 struct lustre_handle *lockh, void *lmm, int lmmsize,
 634                 struct ptlrpc_request **reqp, int extra_lock_flags)
 635 {
 636         struct obd_device     *obddev = class_exp2obd(exp);
 637         struct ptlrpc_request *req = NULL;
 638         struct req_capsule    *pill;
 639         int                    flags = extra_lock_flags;
 640         int                    rc;
 641         struct ldlm_res_id res_id;
 642         static const ldlm_policy_data_t lookup_policy =
 643                             { .l_inodebits = { MDS_INODELOCK_LOOKUP } };
 644         static const ldlm_policy_data_t update_policy =
 645                             { .l_inodebits = { MDS_INODELOCK_UPDATE } };
 646         ldlm_policy_data_t const *policy = &lookup_policy;
 647         ENTRY;
 648
 649         LASSERTF(!it || einfo->ei_type == LDLM_IBITS, "lock type %d\n",
 650                  einfo->ei_type);
 651
 652         fid_build_reg_res_name(&op_data->op_fid1, &res_id);
 653
 654         if (it)
 655                 flags |= LDLM_FL_HAS_INTENT;
 656         if (it && it->it_op & (IT_UNLINK | IT_GETATTR | IT_READDIR))
 657                 policy = &update_policy;
 658
 659         if (reqp)
 660                 req = *reqp;
 661
 662         if (!it) {
 663                 /* The only way right now is FLOCK, in this case we hide flock
 664                    policy as lmm, but lmmsize is 0 */
 665                 LASSERT(lmm && lmmsize == 0);
 666                 LASSERTF(einfo->ei_type == LDLM_FLOCK, "lock type %d\n",
 667                          einfo->ei_type);
 668                 policy = (ldlm_policy_data_t *)lmm;
 669                 res_id.name[3] = LDLM_FLOCK;
 670         } else if (it->it_op & IT_OPEN) {
 671                 req = mdc_intent_open_pack(exp, it, op_data, lmm, lmmsize,
 672                                            einfo->ei_cbdata);
 673                 policy = &update_policy;
 674                 einfo->ei_cbdata = NULL;
 675                 lmm = NULL;
 676         } else if (it->it_op & IT_UNLINK)
 677                 req = mdc_intent_unlink_pack(exp, it, op_data);
 678         else if (it->it_op & (IT_GETATTR | IT_LOOKUP))
 679                 req = mdc_intent_getattr_pack(exp, it, op_data);
 680         else if (it->it_op == IT_READDIR)
 681                 req = ldlm_enqueue_pack(exp);
 682         else {
 683                 LBUG();
 684                 RETURN(-EINVAL);
 685         }
 686
 687         if (IS_ERR(req))
 688                 RETURN(PTR_ERR(req));
 689         pill = &req->rq_pill;
 690
 691         /* It is important to obtain rpc_lock first (if applicable), so that
 692          * threads that are serialised with rpc_lock are not polluting our
 693          * rpcs in flight counter. We do not do flock request limiting, though*/
 694         if (it) {
 695                 mdc_get_rpc_lock(obddev->u.cli.cl_rpc_lock, it);
 696                 mdc_enter_request(&obddev->u.cli);
 697         }
 698
 699         rc = ldlm_cli_enqueue(exp, &req, einfo, &res_id, policy, &flags, NULL,
 700                               0, lockh, 0);
 701         if (reqp)
 702                 *reqp = req;
 703
 704         if (it) {
 705                 mdc_exit_request(&obddev->u.cli);
 706                 mdc_put_rpc_lock(obddev->u.cli.cl_rpc_lock, it);
 707         }
 708         if (!it) {
 709                 /* For flock requests we immediatelly return without further
 710                    delay and let caller deal with the rest, since rest of
 711                    this function metadata processing makes no sense for flock
 712                    requests anyway */
 713                 RETURN(rc);
 714         }
 715
 716         if (rc < 0) {
 717                 CERROR("ldlm_cli_enqueue: %d\n", rc);
 718                 mdc_clear_replay_flag(req, rc);
 719                 ptlrpc_req_finished(req);
 720                 RETURN(rc);
 721         }
 722         rc = mdc_finish_enqueue(exp, req, einfo, it, lockh, rc);
 723
 724         RETURN(rc);
 725 }
 726
 727 static int mdc_finish_intent_lock(struct obd_export *exp,
 728                                   struct ptlrpc_request *request,
 729                                   struct md_op_data *op_data,
 730                                   struct lookup_intent *it,
 731                                   struct lustre_handle *lockh)
 732 {
 733         struct lustre_handle old_lock;
 734         struct mdt_body *mdt_body;
 735         struct ldlm_lock *lock;
 736         int rc;
 737
 738
 739         LASSERT(request != NULL);
 740         LASSERT(request != LP_POISON);
 741         LASSERT(request->rq_repmsg != LP_POISON);
 742
 743         if (!it_disposition(it, DISP_IT_EXECD)) {
 744                 /* The server failed before it even started executing the
 745                  * intent, i.e. because it couldn't unpack the request. */
 746                 LASSERT(it->d.lustre.it_status != 0);
 747                 RETURN(it->d.lustre.it_status);
 748         }
 749         rc = it_open_error(DISP_IT_EXECD, it);
 750         if (rc)
 751                 RETURN(rc);
 752
 753         mdt_body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
 754         LASSERT(mdt_body != NULL);      /* mdc_enqueue checked */
 755
 756         /* If we were revalidating a fid/name pair, mark the intent in
 757          * case we fail and get called again from lookup */
 758         if (fid_is_sane(&op_data->op_fid2) &&
 759             it->it_create_mode & M_CHECK_STALE &&
 760             it->it_op != IT_GETATTR) {
 761                 it_set_disposition(it, DISP_ENQ_COMPLETE);
 762
 763                 /* Also: did we find the same inode? */
 764                 /* sever can return one of two fids:
 765                  * op_fid2 - new allocated fid - if file is created.
 766                  * op_fid3 - existent fid - if file only open.
 767                  * op_fid3 is saved in lmv_intent_open */
 768                 if ((!lu_fid_eq(&op_data->op_fid2, &mdt_body->fid1)) &&
 769                     (!lu_fid_eq(&op_data->op_fid3, &mdt_body->fid1))) {
 770                         CDEBUG(D_DENTRY, "Found stale data "DFID"("DFID")/"DFID
 771                                "\n", PFID(&op_data->op_fid2),
 772                                PFID(&op_data->op_fid2), PFID(&mdt_body->fid1));
 773                         RETURN(-ESTALE);
 774                 }
 775         }
 776
 777         rc = it_open_error(DISP_LOOKUP_EXECD, it);
 778         if (rc)
 779                 RETURN(rc);
 780
 781         /* keep requests around for the multiple phases of the call
 782          * this shows the DISP_XX must guarantee we make it into the call
 783          */
 784         if (!it_disposition(it, DISP_ENQ_CREATE_REF) &&
 785             it_disposition(it, DISP_OPEN_CREATE) &&
 786             !it_open_error(DISP_OPEN_CREATE, it)) {
 787                 it_set_disposition(it, DISP_ENQ_CREATE_REF);
 788                 ptlrpc_request_addref(request); /* balanced in ll_create_node */
 789         }
 790         if (!it_disposition(it, DISP_ENQ_OPEN_REF) &&
 791             it_disposition(it, DISP_OPEN_OPEN) &&
 792             !it_open_error(DISP_OPEN_OPEN, it)) {
 793                 it_set_disposition(it, DISP_ENQ_OPEN_REF);
 794                 ptlrpc_request_addref(request); /* balanced in ll_file_open */
 795                 /* BUG 11546 - eviction in the middle of open rpc processing */
 796                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_ENQUEUE_PAUSE, obd_timeout);
 797         }
 798
 799         if (it->it_op & IT_CREAT) {
 800                 /* XXX this belongs in ll_create_it */
 801         } else if (it->it_op == IT_OPEN) {
 802                 LASSERT(!it_disposition(it, DISP_OPEN_CREATE));
 803         } else {
 804                 LASSERT(it->it_op & (IT_GETATTR | IT_LOOKUP));
 805         }
 806
 807         /* If we already have a matching lock, then cancel the new
 808          * one.  We have to set the data here instead of in
 809          * mdc_enqueue, because we need to use the child's inode as
 810          * the l_ast_data to match, and that's not available until
 811          * intent_finish has performed the iget().) */
 812         lock = ldlm_handle2lock(lockh);
 813         if (lock) {
 814                 ldlm_policy_data_t policy = lock->l_policy_data;
 815                 LDLM_DEBUG(lock, "matching against this");
 816
 817                 LASSERTF(fid_res_name_eq(&mdt_body->fid1,
 818                                          &lock->l_resource->lr_name),
 819                          "Lock res_id: %lu/%lu/%lu, fid: %lu/%lu/%lu.\n",
 820                          (unsigned long)lock->l_resource->lr_name.name[0],
 821                          (unsigned long)lock->l_resource->lr_name.name[1],
 822                          (unsigned long)lock->l_resource->lr_name.name[2],
 823                          (unsigned long)fid_seq(&mdt_body->fid1),
 824                          (unsigned long)fid_oid(&mdt_body->fid1),
 825                          (unsigned long)fid_ver(&mdt_body->fid1));
 826                 LDLM_LOCK_PUT(lock);
 827
 828                 memcpy(&old_lock, lockh, sizeof(*lockh));
 829                 if (ldlm_lock_match(NULL, LDLM_FL_BLOCK_GRANTED, NULL,
 830                                     LDLM_IBITS, &policy, LCK_NL, &old_lock, 0)) {
 831                         ldlm_lock_decref_and_cancel(lockh,
 832                                                     it->d.lustre.it_lock_mode);
 833                         memcpy(lockh, &old_lock, sizeof(old_lock));
 834                         it->d.lustre.it_lock_handle = lockh->cookie;
 835                 }
 836         }
 837         CDEBUG(D_DENTRY,"D_IT dentry %.*s intent: %s status %d disp %x rc %d\n",
 838                op_data->op_namelen, op_data->op_name, ldlm_it2str(it->it_op),
 839                it->d.lustre.it_status, it->d.lustre.it_disposition, rc);
 840         RETURN(rc);
 841 }
 842
 843 int mdc_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
 844                         struct lu_fid *fid)
 845 {
 846         /* We could just return 1 immediately, but since we should only
 847          * be called in revalidate_it if we already have a lock, let's
 848          * verify that. */
 849         struct ldlm_res_id res_id;
 850         struct lustre_handle lockh;
 851         ldlm_policy_data_t policy;
 852         ldlm_mode_t mode;
 853         ENTRY;
 854
 855         fid_build_reg_res_name(fid, &res_id);
 856         policy.l_inodebits.bits = (it->it_op == IT_GETATTR) ?
 857                                   MDS_INODELOCK_UPDATE : MDS_INODELOCK_LOOKUP;
 858
 859         mode = ldlm_lock_match(exp->exp_obd->obd_namespace,
 860                                LDLM_FL_BLOCK_GRANTED, &res_id, LDLM_IBITS,
 861                                &policy, LCK_CR|LCK_CW|LCK_PR|LCK_PW, &lockh, 0);
 862         if (mode) {
 863                 it->d.lustre.it_lock_handle = lockh.cookie;
 864                 it->d.lustre.it_lock_mode = mode;
 865         }
 866
 867         RETURN(!!mode);
 868 }
 869
 870 /*
 871  * This long block is all about fixing up the lock and request state
 872  * so that it is correct as of the moment _before_ the operation was
 873  * applied; that way, the VFS will think that everything is normal and
 874  * call Lustre's regular VFS methods.
 875  *
 876  * If we're performing a creation, that means that unless the creation
 877  * failed with EEXIST, we should fake up a negative dentry.
 878  *
 879  * For everything else, we want to lookup to succeed.
 880  *
 881  * One additional note: if CREATE or OPEN succeeded, we add an extra
 882  * reference to the request because we need to keep it around until
 883  * ll_create/ll_open gets called.
 884  *
 885  * The server will return to us, in it_disposition, an indication of
 886  * exactly what d.lustre.it_status refers to.
 887  *
 888  * If DISP_OPEN_OPEN is set, then d.lustre.it_status refers to the open() call,
 889  * otherwise if DISP_OPEN_CREATE is set, then it status is the
 890  * creation failure mode.  In either case, one of DISP_LOOKUP_NEG or
 891  * DISP_LOOKUP_POS will be set, indicating whether the child lookup
 892  * was successful.
 893  *
 894  * Else, if DISP_LOOKUP_EXECD then d.lustre.it_status is the rc of the
 895  * child lookup.
 896  */
 897 int mdc_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 898                     void *lmm, int lmmsize, struct lookup_intent *it,
 899                     int lookup_flags, struct ptlrpc_request **reqp,
 900                     ldlm_blocking_callback cb_blocking,
 901                     int extra_lock_flags)
 902 {
 903         struct lustre_handle lockh;
 904         int rc = 0;
 905         ENTRY;
 906         LASSERT(it);
 907
 908         CDEBUG(D_DLMTRACE, "(name: %.*s,"DFID") in obj "DFID
 909                ", intent: %s flags %#o\n", op_data->op_namelen,
 910                op_data->op_name, PFID(&op_data->op_fid2),
 911                PFID(&op_data->op_fid1), ldlm_it2str(it->it_op),
 912                it->it_flags);
 913
 914         lockh.cookie = 0;
 915         if (fid_is_sane(&op_data->op_fid2) &&
 916             (it->it_op & (IT_LOOKUP | IT_GETATTR))) {
 917                 /* We could just return 1 immediately, but since we should only
 918                  * be called in revalidate_it if we already have a lock, let's
 919                  * verify that. */
 920                 rc = mdc_revalidate_lock(exp, it, &op_data->op_fid2);
 921                 /* Only return failure if it was not GETATTR by cfid
 922                    (from inode_revalidate) */
 923                 if (rc || op_data->op_namelen != 0)
 924                         RETURN(rc);
 925         }
 926
 927         /* lookup_it may be called only after revalidate_it has run, because
 928          * revalidate_it cannot return errors, only zero.  Returning zero causes
 929          * this call to lookup, which *can* return an error.
 930          *
 931          * We only want to execute the request associated with the intent one
 932          * time, however, so don't send the request again.  Instead, skip past
 933          * this and use the request from revalidate.  In this case, revalidate
 934          * never dropped its reference, so the refcounts are all OK */
 935         if (!it_disposition(it, DISP_ENQ_COMPLETE)) {
 936                 struct ldlm_enqueue_info einfo =
 937                         { LDLM_IBITS, it_to_lock_mode(it), cb_blocking,
 938                           ldlm_completion_ast, NULL, NULL, NULL };
 939
 940                 /* For case if upper layer did not alloc fid, do it now. */
 941                 if (!fid_is_sane(&op_data->op_fid2) && it->it_op & IT_CREAT) {
 942                         rc = mdc_fid_alloc(exp, &op_data->op_fid2, op_data);
 943                         if (rc < 0) {
 944                                 CERROR("Can't alloc new fid, rc %d\n", rc);
 945                                 RETURN(rc);
 946                         }
 947                 }
 948                 rc = mdc_enqueue(exp, &einfo, it, op_data, &lockh,
 949                                  lmm, lmmsize, NULL, extra_lock_flags);
 950                 if (rc < 0)
 951                         RETURN(rc);
 952         } else if (!fid_is_sane(&op_data->op_fid2) ||
 953                    !(it->it_create_mode & M_CHECK_STALE)) {
 954                 /* DISP_ENQ_COMPLETE set means there is extra reference on
 955                  * request referenced from this intent, saved for subsequent
 956                  * lookup.  This path is executed when we proceed to this
 957                  * lookup, so we clear DISP_ENQ_COMPLETE */
 958                 it_clear_disposition(it, DISP_ENQ_COMPLETE);
 959         }
 960         *reqp = it->d.lustre.it_data;
 961         rc = mdc_finish_intent_lock(exp, *reqp, op_data, it, &lockh);
 962         RETURN(rc);
 963 }
 964
 965 static int mdc_intent_getattr_async_interpret(const struct lu_env *env,
 966                                               struct ptlrpc_request *req,
 967                                               void *args, int rc)
 968 {
 969         struct mdc_getattr_args  *ga = args;
 970         struct obd_export        *exp = ga->ga_exp;
 971         struct md_enqueue_info   *minfo = ga->ga_minfo;
 972         struct ldlm_enqueue_info *einfo = ga->ga_einfo;
 973         struct lookup_intent     *it;
 974         struct lustre_handle     *lockh;
 975         struct obd_device        *obddev;
 976         int                       flags = LDLM_FL_HAS_INTENT;
 977         ENTRY;
 978
 979         it    = &minfo->mi_it;
 980         lockh = &minfo->mi_lockh;
 981
 982         obddev = class_exp2obd(exp);
 983
 984         mdc_exit_request(&obddev->u.cli);
 985         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_GETATTR_ENQUEUE))
 986                 rc = -ETIMEDOUT;
 987
 988         rc = ldlm_cli_enqueue_fini(exp, req, einfo->ei_type, 1, einfo->ei_mode,
 989                                    &flags, NULL, 0, lockh, rc);
 990         if (rc < 0) {
 991                 CERROR("ldlm_cli_enqueue_fini: %d\n", rc);
 992                 mdc_clear_replay_flag(req, rc);
 993                 GOTO(out, rc);
 994         }
 995
 996         rc = mdc_finish_enqueue(exp, req, einfo, it, lockh, rc);
 997         if (rc)
 998                 GOTO(out, rc);
 999
1000         rc = mdc_finish_intent_lock(exp, req, &minfo->mi_data, it, lockh);
1001         EXIT;
1002
1003 out:
1004         OBD_FREE_PTR(einfo);
1005         minfo->mi_cb(req, minfo, rc);
1006         return 0;
1007 }
1008
1009 int mdc_intent_getattr_async(struct obd_export *exp,
1010                              struct md_enqueue_info *minfo,
1011                              struct ldlm_enqueue_info *einfo)
1012 {
1013         struct md_op_data       *op_data = &minfo->mi_data;
1014         struct lookup_intent    *it = &minfo->mi_it;
1015         struct ptlrpc_request   *req;
1016         struct mdc_getattr_args *ga;
1017         struct obd_device       *obddev = class_exp2obd(exp);
1018         struct ldlm_res_id       res_id;
1019         /*XXX: Both MDS_INODELOCK_LOOKUP and MDS_INODELOCK_UPDATE are needed
1020          *     for statahead currently. Consider CMD in future, such two bits
1021          *     maybe managed by different MDS, should be adjusted then. */
1022         ldlm_policy_data_t       policy = {
1023                                         .l_inodebits = { MDS_INODELOCK_LOOKUP |
1024                                                          MDS_INODELOCK_UPDATE }
1025                                  };
1026         int                      rc;
1027         int                      flags = LDLM_FL_HAS_INTENT;
1028         ENTRY;
1029
1030         CDEBUG(D_DLMTRACE,"name: %.*s in inode "DFID", intent: %s flags %#o\n",
1031                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1032                ldlm_it2str(it->it_op), it->it_flags);
1033
1034         fid_build_reg_res_name(&op_data->op_fid1, &res_id);
1035         req = mdc_intent_getattr_pack(exp, it, op_data);
1036         if (!req)
1037                 RETURN(-ENOMEM);
1038
1039         mdc_enter_request(&obddev->u.cli);
1040         rc = ldlm_cli_enqueue(exp, &req, einfo, &res_id, &policy, &flags, NULL,
1041                               0, &minfo->mi_lockh, 1);
1042         if (rc < 0) {
1043                 mdc_exit_request(&obddev->u.cli);
1044                 RETURN(rc);
1045         }
1046
1047         CLASSERT(sizeof(*ga) <= sizeof(req->rq_async_args));
1048         ga = ptlrpc_req_async_args(req);
1049         ga->ga_exp = exp;
1050         ga->ga_minfo = minfo;
1051         ga->ga_einfo = einfo;
1052
1053         req->rq_interpret_reply = mdc_intent_getattr_async_interpret;
1054         ptlrpcd_add_req(req, PSCOPE_OTHER);
1055
1056         RETURN(0);
1057 }