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                       __u64 *bits)
 122 {
 123         struct ldlm_lock *lock;
 124         ENTRY;
 125
 126         if(bits)
 127                 *bits = 0;
 128
 129         if (!*lockh)
 130                 RETURN(0);
 131
 132         lock = ldlm_handle2lock((struct lustre_handle *)lockh);
 133
 134         LASSERT(lock != NULL);
 135         lock_res_and_lock(lock);
 136 #ifdef __KERNEL__
 137         if (lock->l_ast_data && lock->l_ast_data != data) {
 138                 struct inode *new_inode = data;
 139                 struct inode *old_inode = lock->l_ast_data;
 140                 LASSERTF(old_inode->i_state & I_FREEING,
 141                          "Found existing inode %p/%lu/%u state %lu in lock: "
 142                          "setting data to %p/%lu/%u\n", old_inode,
 143                          old_inode->i_ino, old_inode->i_generation,
 144                          old_inode->i_state,
 145                          new_inode, new_inode->i_ino, new_inode->i_generation);
 146         }
 147 #endif
 148         lock->l_ast_data = data;
 149         if (bits)
 150                 *bits = lock->l_policy_data.l_inodebits.bits;
 151
 152         unlock_res_and_lock(lock);
 153         LDLM_LOCK_PUT(lock);
 154
 155         RETURN(0);
 156 }
 157
 158 ldlm_mode_t mdc_lock_match(struct obd_export *exp, int flags,
 159                            const struct lu_fid *fid, ldlm_type_t type,
 160                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
 161                            struct lustre_handle *lockh)
 162 {
 163         struct ldlm_res_id res_id;
 164         ldlm_mode_t rc;
 165         ENTRY;
 166
 167         fid_build_reg_res_name(fid, &res_id);
 168         rc = ldlm_lock_match(class_exp2obd(exp)->obd_namespace, flags,
 169                              &res_id, type, policy, mode, lockh, 0);
 170         RETURN(rc);
 171 }
 172
 173 int mdc_cancel_unused(struct obd_export *exp,
 174                       const struct lu_fid *fid,
 175                       ldlm_policy_data_t *policy,
 176                       ldlm_mode_t mode,
 177                       ldlm_cancel_flags_t flags,
 178                       void *opaque)
 179 {
 180         struct ldlm_res_id res_id;
 181         struct obd_device *obd = class_exp2obd(exp);
 182         int rc;
 183
 184         ENTRY;
 185
 186         fid_build_reg_res_name(fid, &res_id);
 187         rc = ldlm_cli_cancel_unused_resource(obd->obd_namespace, &res_id,
 188                                              policy, mode, flags, opaque);
 189         RETURN(rc);
 190 }
 191
 192 int mdc_change_cbdata(struct obd_export *exp,
 193                       const struct lu_fid *fid,
 194                       ldlm_iterator_t it, void *data)
 195 {
 196         struct ldlm_res_id res_id;
 197         ENTRY;
 198
 199         fid_build_reg_res_name(fid, &res_id);
 200         ldlm_resource_iterate(class_exp2obd(exp)->obd_namespace,
 201                               &res_id, it, data);
 202
 203         EXIT;
 204         return 0;
 205 }
 206
 207 /* find any ldlm lock of the inode in mdc
 208  * return 0    not find
 209  *        1    find one
 210  *      < 0    error */
 211 int mdc_find_cbdata(struct obd_export *exp,
 212                     const struct lu_fid *fid,
 213                     ldlm_iterator_t it, void *data)
 214 {
 215         struct ldlm_res_id res_id;
 216         int rc = 0;
 217         ENTRY;
 218
 219         fid_build_reg_res_name((struct lu_fid*)fid, &res_id);
 220         rc = ldlm_resource_iterate(class_exp2obd(exp)->obd_namespace, &res_id,
 221                                    it, data);
 222         if (rc == LDLM_ITER_STOP)
 223                 RETURN(1);
 224         else if (rc == LDLM_ITER_CONTINUE)
 225                 RETURN(0);
 226         RETURN(rc);
 227 }
 228
 229 static inline void mdc_clear_replay_flag(struct ptlrpc_request *req, int rc)
 230 {
 231         /* Don't hold error requests for replay. */
 232         if (req->rq_replay) {
 233                 cfs_spin_lock(&req->rq_lock);
 234                 req->rq_replay = 0;
 235                 cfs_spin_unlock(&req->rq_lock);
 236         }
 237         if (rc && req->rq_transno != 0) {
 238                 DEBUG_REQ(D_ERROR, req, "transno returned on error rc %d", rc);
 239                 LBUG();
 240         }
 241 }
 242
 243 /* Save a large LOV EA into the request buffer so that it is available
 244  * for replay.  We don't do this in the initial request because the
 245  * original request doesn't need this buffer (at most it sends just the
 246  * lov_mds_md) and it is a waste of RAM/bandwidth to send the empty
 247  * buffer and may also be difficult to allocate and save a very large
 248  * request buffer for each open. (bug 5707)
 249  *
 250  * OOM here may cause recovery failure if lmm is needed (only for the
 251  * original open if the MDS crashed just when this client also OOM'd)
 252  * but this is incredibly unlikely, and questionable whether the client
 253  * could do MDS recovery under OOM anyways... */
 254 static void mdc_realloc_openmsg(struct ptlrpc_request *req,
 255                                 struct mdt_body *body)
 256 {
 257         int     rc;
 258
 259         /* FIXME: remove this explicit offset. */
 260         rc = sptlrpc_cli_enlarge_reqbuf(req, DLM_INTENT_REC_OFF + 4,
 261                                         body->eadatasize);
 262         if (rc) {
 263                 CERROR("Can't enlarge segment %d size to %d\n",
 264                        DLM_INTENT_REC_OFF + 4, body->eadatasize);
 265                 body->valid &= ~OBD_MD_FLEASIZE;
 266                 body->eadatasize = 0;
 267         }
 268 }
 269
 270 static struct ptlrpc_request *mdc_intent_open_pack(struct obd_export *exp,
 271                                                    struct lookup_intent *it,
 272                                                    struct md_op_data *op_data,
 273                                                    void *lmm, int lmmsize,
 274                                                    void *cb_data)
 275 {
 276         struct ptlrpc_request *req;
 277         struct obd_device     *obddev = class_exp2obd(exp);
 278         struct ldlm_intent    *lit;
 279         CFS_LIST_HEAD(cancels);
 280         int                    count = 0;
 281         int                    mode;
 282         int                    rc;
 283         ENTRY;
 284
 285         it->it_create_mode = (it->it_create_mode & ~S_IFMT) | S_IFREG;
 286
 287         /* XXX: openlock is not cancelled for cross-refs. */
 288         /* If inode is known, cancel conflicting OPEN locks. */
 289         if (fid_is_sane(&op_data->op_fid2)) {
 290                 if (it->it_flags & (FMODE_WRITE|MDS_OPEN_TRUNC))
 291                         mode = LCK_CW;
 292 #ifdef FMODE_EXEC
 293                 else if (it->it_flags & FMODE_EXEC)
 294                         mode = LCK_PR;
 295 #endif
 296                 else
 297                         mode = LCK_CR;
 298                 count = mdc_resource_get_unused(exp, &op_data->op_fid2,
 299                                                 &cancels, mode,
 300                                                 MDS_INODELOCK_OPEN);
 301         }
 302
 303         /* If CREATE, cancel parent's UPDATE lock. */
 304         if (it->it_op & IT_CREAT)
 305                 mode = LCK_EX;
 306         else
 307                 mode = LCK_CR;
 308         count += mdc_resource_get_unused(exp, &op_data->op_fid1,
 309                                          &cancels, mode,
 310                                          MDS_INODELOCK_UPDATE);
 311
 312         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 313                                    &RQF_LDLM_INTENT_OPEN);
 314         if (req == NULL) {
 315                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 316                 RETURN(ERR_PTR(-ENOMEM));
 317         }
 318
 319         /* parent capability */
 320         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 321         /* child capability, reserve the size according to parent capa, it will
 322          * be filled after we get the reply */
 323         mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa1);
 324
 325         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 326                              op_data->op_namelen + 1);
 327         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 328                              max(lmmsize, obddev->u.cli.cl_default_mds_easize));
 329
 330         rc = ldlm_prep_enqueue_req(exp, req, &cancels, count);
 331         if (rc) {
 332                 ptlrpc_request_free(req);
 333                 return NULL;
 334         }
 335
 336         cfs_spin_lock(&req->rq_lock);
 337         req->rq_replay = req->rq_import->imp_replayable;
 338         cfs_spin_unlock(&req->rq_lock);
 339
 340         /* pack the intent */
 341         lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
 342         lit->opc = (__u64)it->it_op;
 343
 344         /* pack the intended request */
 345         mdc_open_pack(req, op_data, it->it_create_mode, 0, it->it_flags, lmm,
 346                       lmmsize);
 347
 348         /* for remote client, fetch remote perm for current user */
 349         if (client_is_remote(exp))
 350                 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 351                                      sizeof(struct mdt_remote_perm));
 352         ptlrpc_request_set_replen(req);
 353         return req;
 354 }
 355
 356 static struct ptlrpc_request *mdc_intent_unlink_pack(struct obd_export *exp,
 357                                                      struct lookup_intent *it,
 358                                                      struct md_op_data *op_data)
 359 {
 360         struct ptlrpc_request *req;
 361         struct obd_device     *obddev = class_exp2obd(exp);
 362         struct ldlm_intent    *lit;
 363         int                    rc;
 364         ENTRY;
 365
 366         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 367                                    &RQF_LDLM_INTENT_UNLINK);
 368         if (req == NULL)
 369                 RETURN(ERR_PTR(-ENOMEM));
 370
 371         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 372         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 373                              op_data->op_namelen + 1);
 374
 375         rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
 376         if (rc) {
 377                 ptlrpc_request_free(req);
 378                 RETURN(ERR_PTR(rc));
 379         }
 380
 381         /* pack the intent */
 382         lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
 383         lit->opc = (__u64)it->it_op;
 384
 385         /* pack the intended request */
 386         mdc_unlink_pack(req, op_data);
 387
 388         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 389                              obddev->u.cli.cl_max_mds_easize);
 390         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 391                              obddev->u.cli.cl_max_mds_cookiesize);
 392         ptlrpc_request_set_replen(req);
 393         RETURN(req);
 394 }
 395
 396 static struct ptlrpc_request *mdc_intent_getattr_pack(struct obd_export *exp,
 397                                                       struct lookup_intent *it,
 398                                                       struct md_op_data *op_data)
 399 {
 400         struct ptlrpc_request *req;
 401         struct obd_device     *obddev = class_exp2obd(exp);
 402         obd_valid              valid = OBD_MD_FLGETATTR | OBD_MD_FLEASIZE |
 403                                        OBD_MD_FLMODEASIZE | OBD_MD_FLDIREA |
 404                                        OBD_MD_FLMDSCAPA | OBD_MD_MEA |
 405                                        (client_is_remote(exp) ?
 406                                                OBD_MD_FLRMTPERM : OBD_MD_FLACL);
 407         struct ldlm_intent    *lit;
 408         int                    rc;
 409         ENTRY;
 410
 411         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 412                                    &RQF_LDLM_INTENT_GETATTR);
 413         if (req == NULL)
 414                 RETURN(ERR_PTR(-ENOMEM));
 415
 416         mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 417         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 418                              op_data->op_namelen + 1);
 419
 420         rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
 421         if (rc) {
 422                 ptlrpc_request_free(req);
 423                 RETURN(ERR_PTR(rc));
 424         }
 425
 426         /* pack the intent */
 427         lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
 428         lit->opc = (__u64)it->it_op;
 429
 430         /* pack the intended request */
 431         mdc_getattr_pack(req, valid, it->it_flags, op_data,
 432                          obddev->u.cli.cl_max_mds_easize);
 433
 434         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 435                              obddev->u.cli.cl_max_mds_easize);
 436         if (client_is_remote(exp))
 437                 req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
 438                                      sizeof(struct mdt_remote_perm));
 439         ptlrpc_request_set_replen(req);
 440         RETURN(req);
 441 }
 442
 443 static struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp)
 444 {
 445         struct ptlrpc_request *req;
 446         int rc;
 447         ENTRY;
 448
 449         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LDLM_ENQUEUE);
 450         if (req == NULL)
 451                 RETURN(ERR_PTR(-ENOMEM));
 452
 453         rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
 454         if (rc) {
 455                 ptlrpc_request_free(req);
 456                 RETURN(ERR_PTR(rc));
 457         }
 458
 459         ptlrpc_request_set_replen(req);
 460         RETURN(req);
 461 }
 462
 463 static int mdc_finish_enqueue(struct obd_export *exp,
 464                               struct ptlrpc_request *req,
 465                               struct ldlm_enqueue_info *einfo,
 466                               struct lookup_intent *it,
 467                               struct lustre_handle *lockh,
 468                               int rc)
 469 {
 470         struct req_capsule  *pill = &req->rq_pill;
 471         struct ldlm_request *lockreq;
 472         struct ldlm_reply   *lockrep;
 473         ENTRY;
 474
 475         LASSERT(rc >= 0);
 476         /* Similarly, if we're going to replay this request, we don't want to
 477          * actually get a lock, just perform the intent. */
 478         if (req->rq_transno || req->rq_replay) {
 479                 lockreq = req_capsule_client_get(pill, &RMF_DLM_REQ);
 480                 lockreq->lock_flags |= LDLM_FL_INTENT_ONLY;
 481         }
 482
 483         if (rc == ELDLM_LOCK_ABORTED) {
 484                 einfo->ei_mode = 0;
 485                 memset(lockh, 0, sizeof(*lockh));
 486                 rc = 0;
 487         } else { /* rc = 0 */
 488                 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
 489                 LASSERT(lock);
 490
 491                 /* If the server gave us back a different lock mode, we should
 492                  * fix up our variables. */
 493                 if (lock->l_req_mode != einfo->ei_mode) {
 494                         ldlm_lock_addref(lockh, lock->l_req_mode);
 495                         ldlm_lock_decref(lockh, einfo->ei_mode);
 496                         einfo->ei_mode = lock->l_req_mode;
 497                 }
 498                 LDLM_LOCK_PUT(lock);
 499         }
 500
 501         lockrep = req_capsule_server_get(pill, &RMF_DLM_REP);
 502         LASSERT(lockrep != NULL);                 /* checked by ldlm_cli_enqueue() */
 503
 504         it->d.lustre.it_disposition = (int)lockrep->lock_policy_res1;
 505         it->d.lustre.it_status = (int)lockrep->lock_policy_res2;
 506         it->d.lustre.it_lock_mode = einfo->ei_mode;
 507         it->d.lustre.it_lock_handle = lockh->cookie;
 508         it->d.lustre.it_data = req;
 509
 510         if (it->d.lustre.it_status < 0 && req->rq_replay)
 511                 mdc_clear_replay_flag(req, it->d.lustre.it_status);
 512
 513         /* If we're doing an IT_OPEN which did not result in an actual
 514          * successful open, then we need to remove the bit which saves
 515          * this request for unconditional replay.
 516          *
 517          * It's important that we do this first!  Otherwise we might exit the
 518          * function without doing so, and try to replay a failed create
 519          * (bug 3440) */
 520         if (it->it_op & IT_OPEN && req->rq_replay &&
 521             (!it_disposition(it, DISP_OPEN_OPEN) ||it->d.lustre.it_status != 0))
 522                 mdc_clear_replay_flag(req, it->d.lustre.it_status);
 523
 524         DEBUG_REQ(D_RPCTRACE, req, "op: %d disposition: %x, status: %d",
 525                   it->it_op,it->d.lustre.it_disposition,it->d.lustre.it_status);
 526
 527         /* We know what to expect, so we do any byte flipping required here */
 528         if (it->it_op & (IT_OPEN | IT_UNLINK | IT_LOOKUP | IT_GETATTR)) {
 529                 struct mdt_body *body;
 530
 531                 body = req_capsule_server_get(pill, &RMF_MDT_BODY);
 532                 if (body == NULL) {
 533                         CERROR ("Can't swab mdt_body\n");
 534                         RETURN (-EPROTO);
 535                 }
 536
 537                 if (it_disposition(it, DISP_OPEN_OPEN) &&
 538                     !it_open_error(DISP_OPEN_OPEN, it)) {
 539                         /*
 540                          * If this is a successful OPEN request, we need to set
 541                          * replay handler and data early, so that if replay
 542                          * happens immediately after swabbing below, new reply
 543                          * is swabbed by that handler correctly.
 544                          */
 545                         mdc_set_open_replay_data(NULL, NULL, req);
 546                 }
 547
 548                 if ((body->valid & (OBD_MD_FLDIREA | OBD_MD_FLEASIZE)) != 0) {
 549                         void *eadata;
 550
 551                          mdc_update_max_ea_from_body(exp, body);
 552
 553                         /*
 554                          * The eadata is opaque; just check that it is there.
 555                          * Eventually, obd_unpackmd() will check the contents.
 556                          */
 557                         eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
 558                                                               body->eadatasize);
 559                         if (eadata == NULL)
 560                                 RETURN(-EPROTO);
 561
 562                         /*
 563                          * We save the reply LOV EA in case we have to replay a
 564                          * create for recovery.  If we didn't allocate a large
 565                          * enough request buffer above we need to reallocate it
 566                          * here to hold the actual LOV EA.
 567                          *
 568                          * To not save LOV EA if request is not going to replay
 569                          * (for example error one).
 570                          */
 571                         if ((it->it_op & IT_OPEN) && req->rq_replay) {
 572                                 void *lmm;
 573                                 if (req_capsule_get_size(pill, &RMF_EADATA,
 574                                                          RCL_CLIENT) <
 575                                     body->eadatasize)
 576                                         mdc_realloc_openmsg(req, body);
 577                                 else
 578                                         req_capsule_shrink(pill, &RMF_EADATA,
 579                                                            body->eadatasize,
 580                                                            RCL_CLIENT);
 581
 582                                 req_capsule_set_size(pill, &RMF_EADATA,
 583                                                      RCL_CLIENT,
 584                                                      body->eadatasize);
 585
 586                                 lmm = req_capsule_client_get(pill, &RMF_EADATA);
 587                                 if (lmm)
 588                                         memcpy(lmm, eadata, body->eadatasize);
 589                         }
 590                 }
 591
 592                 if (body->valid & OBD_MD_FLRMTPERM) {
 593                         struct mdt_remote_perm *perm;
 594
 595                         LASSERT(client_is_remote(exp));
 596                         perm = req_capsule_server_swab_get(pill, &RMF_ACL,
 597                                                 lustre_swab_mdt_remote_perm);
 598                         if (perm == NULL)
 599                                 RETURN(-EPROTO);
 600                 }
 601                 if (body->valid & OBD_MD_FLMDSCAPA) {
 602                         struct lustre_capa *capa, *p;
 603
 604                         capa = req_capsule_server_get(pill, &RMF_CAPA1);
 605                         if (capa == NULL)
 606                                 RETURN(-EPROTO);
 607
 608                         if (it->it_op & IT_OPEN) {
 609                                 /* client fid capa will be checked in replay */
 610                                 p = req_capsule_client_get(pill, &RMF_CAPA2);
 611                                 LASSERT(p);
 612                                 *p = *capa;
 613                         }
 614                 }
 615                 if (body->valid & OBD_MD_FLOSSCAPA) {
 616                         struct lustre_capa *capa;
 617
 618                         capa = req_capsule_server_get(pill, &RMF_CAPA2);
 619                         if (capa == NULL)
 620                                 RETURN(-EPROTO);
 621                 }
 622         }
 623
 624         RETURN(rc);
 625 }
 626
 627 /* We always reserve enough space in the reply packet for a stripe MD, because
 628  * we don't know in advance the file type. */
 629 int mdc_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
 630                 struct lookup_intent *it, struct md_op_data *op_data,
 631                 struct lustre_handle *lockh, void *lmm, int lmmsize,
 632                 struct ptlrpc_request **reqp, int extra_lock_flags)
 633 {
 634         struct obd_device     *obddev = class_exp2obd(exp);
 635         struct ptlrpc_request *req = NULL;
 636         struct req_capsule    *pill;
 637         int                    flags = extra_lock_flags;
 638         int                    rc;
 639         struct ldlm_res_id res_id;
 640         static const ldlm_policy_data_t lookup_policy =
 641                             { .l_inodebits = { MDS_INODELOCK_LOOKUP } };
 642         static const ldlm_policy_data_t update_policy =
 643                             { .l_inodebits = { MDS_INODELOCK_UPDATE } };
 644         ldlm_policy_data_t const *policy = &lookup_policy;
 645         ENTRY;
 646
 647         LASSERTF(!it || einfo->ei_type == LDLM_IBITS, "lock type %d\n",
 648                  einfo->ei_type);
 649
 650         fid_build_reg_res_name(&op_data->op_fid1, &res_id);
 651
 652         if (it)
 653                 flags |= LDLM_FL_HAS_INTENT;
 654         if (it && it->it_op & (IT_UNLINK | IT_GETATTR | IT_READDIR))
 655                 policy = &update_policy;
 656
 657         if (reqp)
 658                 req = *reqp;
 659
 660         if (!it) {
 661                 /* The only way right now is FLOCK, in this case we hide flock
 662                    policy as lmm, but lmmsize is 0 */
 663                 LASSERT(lmm && lmmsize == 0);
 664                 LASSERTF(einfo->ei_type == LDLM_FLOCK, "lock type %d\n",
 665                          einfo->ei_type);
 666                 policy = (ldlm_policy_data_t *)lmm;
 667                 res_id.name[3] = LDLM_FLOCK;
 668         } else if (it->it_op & IT_OPEN) {
 669                 req = mdc_intent_open_pack(exp, it, op_data, lmm, lmmsize,
 670                                            einfo->ei_cbdata);
 671                 policy = &update_policy;
 672                 einfo->ei_cbdata = NULL;
 673                 lmm = NULL;
 674         } else if (it->it_op & IT_UNLINK)
 675                 req = mdc_intent_unlink_pack(exp, it, op_data);
 676         else if (it->it_op & (IT_GETATTR | IT_LOOKUP))
 677                 req = mdc_intent_getattr_pack(exp, it, op_data);
 678         else if (it->it_op == IT_READDIR)
 679                 req = ldlm_enqueue_pack(exp);
 680         else {
 681                 LBUG();
 682                 RETURN(-EINVAL);
 683         }
 684
 685         if (IS_ERR(req))
 686                 RETURN(PTR_ERR(req));
 687         pill = &req->rq_pill;
 688
 689         /* It is important to obtain rpc_lock first (if applicable), so that
 690          * threads that are serialised with rpc_lock are not polluting our
 691          * rpcs in flight counter. We do not do flock request limiting, though*/
 692         if (it) {
 693                 mdc_get_rpc_lock(obddev->u.cli.cl_rpc_lock, it);
 694                 rc = mdc_enter_request(&obddev->u.cli);
 695                 if (rc != 0) {
 696                         mdc_put_rpc_lock(obddev->u.cli.cl_rpc_lock, it);
 697                         ptlrpc_req_finished(req);
 698                         RETURN(rc);
 699                 }
 700         }
 701
 702         rc = ldlm_cli_enqueue(exp, &req, einfo, &res_id, policy, &flags, NULL,
 703                               0, lockh, 0);
 704         if (reqp)
 705                 *reqp = req;
 706
 707         if (it) {
 708                 mdc_exit_request(&obddev->u.cli);
 709                 mdc_put_rpc_lock(obddev->u.cli.cl_rpc_lock, it);
 710         }
 711         if (!it) {
 712                 /* For flock requests we immediatelly return without further
 713                    delay and let caller deal with the rest, since rest of
 714                    this function metadata processing makes no sense for flock
 715                    requests anyway */
 716                 RETURN(rc);
 717         }
 718
 719         if (rc < 0) {
 720                 CERROR("ldlm_cli_enqueue: %d\n", rc);
 721                 mdc_clear_replay_flag(req, rc);
 722                 ptlrpc_req_finished(req);
 723                 RETURN(rc);
 724         }
 725         rc = mdc_finish_enqueue(exp, req, einfo, it, lockh, rc);
 726
 727         RETURN(rc);
 728 }
 729
 730 static int mdc_finish_intent_lock(struct obd_export *exp,
 731                                   struct ptlrpc_request *request,
 732                                   struct md_op_data *op_data,
 733                                   struct lookup_intent *it,
 734                                   struct lustre_handle *lockh)
 735 {
 736         struct lustre_handle old_lock;
 737         struct mdt_body *mdt_body;
 738         struct ldlm_lock *lock;
 739         int rc;
 740
 741
 742         LASSERT(request != NULL);
 743         LASSERT(request != LP_POISON);
 744         LASSERT(request->rq_repmsg != LP_POISON);
 745
 746         if (!it_disposition(it, DISP_IT_EXECD)) {
 747                 /* The server failed before it even started executing the
 748                  * intent, i.e. because it couldn't unpack the request. */
 749                 LASSERT(it->d.lustre.it_status != 0);
 750                 RETURN(it->d.lustre.it_status);
 751         }
 752         rc = it_open_error(DISP_IT_EXECD, it);
 753         if (rc)
 754                 RETURN(rc);
 755
 756         mdt_body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
 757         LASSERT(mdt_body != NULL);      /* mdc_enqueue checked */
 758
 759         /* If we were revalidating a fid/name pair, mark the intent in
 760          * case we fail and get called again from lookup */
 761         if (fid_is_sane(&op_data->op_fid2) &&
 762             it->it_create_mode & M_CHECK_STALE &&
 763             it->it_op != IT_GETATTR) {
 764                 it_set_disposition(it, DISP_ENQ_COMPLETE);
 765
 766                 /* Also: did we find the same inode? */
 767                 /* sever can return one of two fids:
 768                  * op_fid2 - new allocated fid - if file is created.
 769                  * op_fid3 - existent fid - if file only open.
 770                  * op_fid3 is saved in lmv_intent_open */
 771                 if ((!lu_fid_eq(&op_data->op_fid2, &mdt_body->fid1)) &&
 772                     (!lu_fid_eq(&op_data->op_fid3, &mdt_body->fid1))) {
 773                         CDEBUG(D_DENTRY, "Found stale data "DFID"("DFID")/"DFID
 774                                "\n", PFID(&op_data->op_fid2),
 775                                PFID(&op_data->op_fid2), PFID(&mdt_body->fid1));
 776                         RETURN(-ESTALE);
 777                 }
 778         }
 779
 780         rc = it_open_error(DISP_LOOKUP_EXECD, it);
 781         if (rc)
 782                 RETURN(rc);
 783
 784         /* keep requests around for the multiple phases of the call
 785          * this shows the DISP_XX must guarantee we make it into the call
 786          */
 787         if (!it_disposition(it, DISP_ENQ_CREATE_REF) &&
 788             it_disposition(it, DISP_OPEN_CREATE) &&
 789             !it_open_error(DISP_OPEN_CREATE, it)) {
 790                 it_set_disposition(it, DISP_ENQ_CREATE_REF);
 791                 ptlrpc_request_addref(request); /* balanced in ll_create_node */
 792         }
 793         if (!it_disposition(it, DISP_ENQ_OPEN_REF) &&
 794             it_disposition(it, DISP_OPEN_OPEN) &&
 795             !it_open_error(DISP_OPEN_OPEN, it)) {
 796                 it_set_disposition(it, DISP_ENQ_OPEN_REF);
 797                 ptlrpc_request_addref(request); /* balanced in ll_file_open */
 798                 /* BUG 11546 - eviction in the middle of open rpc processing */
 799                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_ENQUEUE_PAUSE, obd_timeout);
 800         }
 801
 802         if (it->it_op & IT_CREAT) {
 803                 /* XXX this belongs in ll_create_it */
 804         } else if (it->it_op == IT_OPEN) {
 805                 LASSERT(!it_disposition(it, DISP_OPEN_CREATE));
 806         } else {
 807                 LASSERT(it->it_op & (IT_GETATTR | IT_LOOKUP));
 808         }
 809
 810         /* If we already have a matching lock, then cancel the new
 811          * one.  We have to set the data here instead of in
 812          * mdc_enqueue, because we need to use the child's inode as
 813          * the l_ast_data to match, and that's not available until
 814          * intent_finish has performed the iget().) */
 815         lock = ldlm_handle2lock(lockh);
 816         if (lock) {
 817                 ldlm_policy_data_t policy = lock->l_policy_data;
 818                 LDLM_DEBUG(lock, "matching against this");
 819
 820                 LASSERTF(fid_res_name_eq(&mdt_body->fid1,
 821                                          &lock->l_resource->lr_name),
 822                          "Lock res_id: %lu/%lu/%lu, fid: %lu/%lu/%lu.\n",
 823                          (unsigned long)lock->l_resource->lr_name.name[0],
 824                          (unsigned long)lock->l_resource->lr_name.name[1],
 825                          (unsigned long)lock->l_resource->lr_name.name[2],
 826                          (unsigned long)fid_seq(&mdt_body->fid1),
 827                          (unsigned long)fid_oid(&mdt_body->fid1),
 828                          (unsigned long)fid_ver(&mdt_body->fid1));
 829                 LDLM_LOCK_PUT(lock);
 830
 831                 memcpy(&old_lock, lockh, sizeof(*lockh));
 832                 if (ldlm_lock_match(NULL, LDLM_FL_BLOCK_GRANTED, NULL,
 833                                     LDLM_IBITS, &policy, LCK_NL, &old_lock, 0)) {
 834                         ldlm_lock_decref_and_cancel(lockh,
 835                                                     it->d.lustre.it_lock_mode);
 836                         memcpy(lockh, &old_lock, sizeof(old_lock));
 837                         it->d.lustre.it_lock_handle = lockh->cookie;
 838                 }
 839         }
 840         CDEBUG(D_DENTRY,"D_IT dentry %.*s intent: %s status %d disp %x rc %d\n",
 841                op_data->op_namelen, op_data->op_name, ldlm_it2str(it->it_op),
 842                it->d.lustre.it_status, it->d.lustre.it_disposition, rc);
 843         RETURN(rc);
 844 }
 845
 846 int mdc_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
 847                         struct lu_fid *fid, __u64 *bits)
 848 {
 849         /* We could just return 1 immediately, but since we should only
 850          * be called in revalidate_it if we already have a lock, let's
 851          * verify that. */
 852         struct ldlm_res_id res_id;
 853         struct lustre_handle lockh;
 854         ldlm_policy_data_t policy;
 855         ldlm_mode_t mode;
 856         ENTRY;
 857
 858         if (it->d.lustre.it_lock_handle) {
 859                 lockh.cookie = it->d.lustre.it_lock_handle;
 860                 mode = ldlm_revalidate_lock_handle(&lockh, bits);
 861         } else {
 862                 fid_build_reg_res_name(fid, &res_id);
 863                 policy.l_inodebits.bits = (it->it_op == IT_GETATTR) ?
 864                                   MDS_INODELOCK_UPDATE : MDS_INODELOCK_LOOKUP;
 865                 mode = ldlm_lock_match(exp->exp_obd->obd_namespace,
 866                                        LDLM_FL_BLOCK_GRANTED, &res_id,
 867                                        LDLM_IBITS, &policy,
 868                                        LCK_CR|LCK_CW|LCK_PR|LCK_PW, &lockh, 0);
 869         }
 870
 871         if (mode) {
 872                 it->d.lustre.it_lock_handle = lockh.cookie;
 873                 it->d.lustre.it_lock_mode = mode;
 874         } else {
 875                 it->d.lustre.it_lock_handle = 0;
 876                 it->d.lustre.it_lock_mode = 0;
 877         }
 878
 879         RETURN(!!mode);
 880 }
 881
 882 /*
 883  * This long block is all about fixing up the lock and request state
 884  * so that it is correct as of the moment _before_ the operation was
 885  * applied; that way, the VFS will think that everything is normal and
 886  * call Lustre's regular VFS methods.
 887  *
 888  * If we're performing a creation, that means that unless the creation
 889  * failed with EEXIST, we should fake up a negative dentry.
 890  *
 891  * For everything else, we want to lookup to succeed.
 892  *
 893  * One additional note: if CREATE or OPEN succeeded, we add an extra
 894  * reference to the request because we need to keep it around until
 895  * ll_create/ll_open gets called.
 896  *
 897  * The server will return to us, in it_disposition, an indication of
 898  * exactly what d.lustre.it_status refers to.
 899  *
 900  * If DISP_OPEN_OPEN is set, then d.lustre.it_status refers to the open() call,
 901  * otherwise if DISP_OPEN_CREATE is set, then it status is the
 902  * creation failure mode.  In either case, one of DISP_LOOKUP_NEG or
 903  * DISP_LOOKUP_POS will be set, indicating whether the child lookup
 904  * was successful.
 905  *
 906  * Else, if DISP_LOOKUP_EXECD then d.lustre.it_status is the rc of the
 907  * child lookup.
 908  */
 909 int mdc_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 910                     void *lmm, int lmmsize, struct lookup_intent *it,
 911                     int lookup_flags, struct ptlrpc_request **reqp,
 912                     ldlm_blocking_callback cb_blocking,
 913                     int extra_lock_flags)
 914 {
 915         struct lustre_handle lockh;
 916         int rc = 0;
 917         ENTRY;
 918         LASSERT(it);
 919
 920         CDEBUG(D_DLMTRACE, "(name: %.*s,"DFID") in obj "DFID
 921                ", intent: %s flags %#o\n", op_data->op_namelen,
 922                op_data->op_name, PFID(&op_data->op_fid2),
 923                PFID(&op_data->op_fid1), ldlm_it2str(it->it_op),
 924                it->it_flags);
 925
 926         lockh.cookie = 0;
 927         if (fid_is_sane(&op_data->op_fid2) &&
 928             (it->it_op & (IT_LOOKUP | IT_GETATTR))) {
 929                 /* We could just return 1 immediately, but since we should only
 930                  * be called in revalidate_it if we already have a lock, let's
 931                  * verify that. */
 932                 it->d.lustre.it_lock_handle = 0;
 933                 rc = mdc_revalidate_lock(exp, it, &op_data->op_fid2, NULL);
 934                 /* Only return failure if it was not GETATTR by cfid
 935                    (from inode_revalidate) */
 936                 if (rc || op_data->op_namelen != 0)
 937                         RETURN(rc);
 938         }
 939
 940         /* lookup_it may be called only after revalidate_it has run, because
 941          * revalidate_it cannot return errors, only zero.  Returning zero causes
 942          * this call to lookup, which *can* return an error.
 943          *
 944          * We only want to execute the request associated with the intent one
 945          * time, however, so don't send the request again.  Instead, skip past
 946          * this and use the request from revalidate.  In this case, revalidate
 947          * never dropped its reference, so the refcounts are all OK */
 948         if (!it_disposition(it, DISP_ENQ_COMPLETE)) {
 949                 struct ldlm_enqueue_info einfo =
 950                         { LDLM_IBITS, it_to_lock_mode(it), cb_blocking,
 951                           ldlm_completion_ast, NULL, NULL, NULL };
 952
 953                 /* For case if upper layer did not alloc fid, do it now. */
 954                 if (!fid_is_sane(&op_data->op_fid2) && it->it_op & IT_CREAT) {
 955                         rc = mdc_fid_alloc(exp, &op_data->op_fid2, op_data);
 956                         if (rc < 0) {
 957                                 CERROR("Can't alloc new fid, rc %d\n", rc);
 958                                 RETURN(rc);
 959                         }
 960                 }
 961                 rc = mdc_enqueue(exp, &einfo, it, op_data, &lockh,
 962                                  lmm, lmmsize, NULL, extra_lock_flags);
 963                 if (rc < 0)
 964                         RETURN(rc);
 965         } else if (!fid_is_sane(&op_data->op_fid2) ||
 966                    !(it->it_create_mode & M_CHECK_STALE)) {
 967                 /* DISP_ENQ_COMPLETE set means there is extra reference on
 968                  * request referenced from this intent, saved for subsequent
 969                  * lookup.  This path is executed when we proceed to this
 970                  * lookup, so we clear DISP_ENQ_COMPLETE */
 971                 it_clear_disposition(it, DISP_ENQ_COMPLETE);
 972         }
 973         *reqp = it->d.lustre.it_data;
 974         rc = mdc_finish_intent_lock(exp, *reqp, op_data, it, &lockh);
 975         RETURN(rc);
 976 }
 977
 978 static int mdc_intent_getattr_async_interpret(const struct lu_env *env,
 979                                               struct ptlrpc_request *req,
 980                                               void *args, int rc)
 981 {
 982         struct mdc_getattr_args  *ga = args;
 983         struct obd_export        *exp = ga->ga_exp;
 984         struct md_enqueue_info   *minfo = ga->ga_minfo;
 985         struct ldlm_enqueue_info *einfo = ga->ga_einfo;
 986         struct lookup_intent     *it;
 987         struct lustre_handle     *lockh;
 988         struct obd_device        *obddev;
 989         int                       flags = LDLM_FL_HAS_INTENT;
 990         ENTRY;
 991
 992         it    = &minfo->mi_it;
 993         lockh = &minfo->mi_lockh;
 994
 995         obddev = class_exp2obd(exp);
 996
 997         mdc_exit_request(&obddev->u.cli);
 998         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_GETATTR_ENQUEUE))
 999                 rc = -ETIMEDOUT;
1000
1001         rc = ldlm_cli_enqueue_fini(exp, req, einfo->ei_type, 1, einfo->ei_mode,
1002                                    &flags, NULL, 0, lockh, rc);
1003         if (rc < 0) {
1004                 CERROR("ldlm_cli_enqueue_fini: %d\n", rc);
1005                 mdc_clear_replay_flag(req, rc);
1006                 GOTO(out, rc);
1007         }
1008
1009         rc = mdc_finish_enqueue(exp, req, einfo, it, lockh, rc);
1010         if (rc)
1011                 GOTO(out, rc);
1012
1013         rc = mdc_finish_intent_lock(exp, req, &minfo->mi_data, it, lockh);
1014         EXIT;
1015
1016 out:
1017         OBD_FREE_PTR(einfo);
1018         minfo->mi_cb(req, minfo, rc);
1019         return 0;
1020 }
1021
1022 int mdc_intent_getattr_async(struct obd_export *exp,
1023                              struct md_enqueue_info *minfo,
1024                              struct ldlm_enqueue_info *einfo)
1025 {
1026         struct md_op_data       *op_data = &minfo->mi_data;
1027         struct lookup_intent    *it = &minfo->mi_it;
1028         struct ptlrpc_request   *req;
1029         struct mdc_getattr_args *ga;
1030         struct obd_device       *obddev = class_exp2obd(exp);
1031         struct ldlm_res_id       res_id;
1032         /*XXX: Both MDS_INODELOCK_LOOKUP and MDS_INODELOCK_UPDATE are needed
1033          *     for statahead currently. Consider CMD in future, such two bits
1034          *     maybe managed by different MDS, should be adjusted then. */
1035         ldlm_policy_data_t       policy = {
1036                                         .l_inodebits = { MDS_INODELOCK_LOOKUP |
1037                                                          MDS_INODELOCK_UPDATE }
1038                                  };
1039         int                      rc = 0;
1040         int                      flags = LDLM_FL_HAS_INTENT;
1041         ENTRY;
1042
1043         CDEBUG(D_DLMTRACE,"name: %.*s in inode "DFID", intent: %s flags %#o\n",
1044                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1045                ldlm_it2str(it->it_op), it->it_flags);
1046
1047         fid_build_reg_res_name(&op_data->op_fid1, &res_id);
1048         req = mdc_intent_getattr_pack(exp, it, op_data);
1049         if (!req)
1050                 RETURN(-ENOMEM);
1051
1052         rc = mdc_enter_request(&obddev->u.cli);
1053         if (rc != 0) {
1054                 ptlrpc_req_finished(req);
1055                 RETURN(rc);
1056         }
1057
1058         rc = ldlm_cli_enqueue(exp, &req, einfo, &res_id, &policy, &flags, NULL,
1059                               0, &minfo->mi_lockh, 1);
1060         if (rc < 0) {
1061                 mdc_exit_request(&obddev->u.cli);
1062                 ptlrpc_req_finished(req);
1063                 RETURN(rc);
1064         }
1065
1066         CLASSERT(sizeof(*ga) <= sizeof(req->rq_async_args));
1067         ga = ptlrpc_req_async_args(req);
1068         ga->ga_exp = exp;
1069         ga->ga_minfo = minfo;
1070         ga->ga_einfo = einfo;
1071
1072         req->rq_interpret_reply = mdc_intent_getattr_async_interpret;
1073         ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
1074
1075         RETURN(0);
1076 }