lustre/quota/qsd_lock.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA
  20  *
  21  * GPL HEADER END
  22  */
  23 /*
  24  * Copyright (c) 2012, 2017, Intel Corporation.
  25  * Use is subject to license terms.
  26  *
  27  * Author: Johann Lombardi <johann.lombardi@intel.com>
  28  * Author: Niu    Yawei    <yawei.niu@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LQUOTA
  32
  33 #include <lustre_dlm.h>
  34 #include <obd_class.h>
  35 #include <lustre_swab.h>
  36
  37 #include "qsd_internal.h"
  38
  39 typedef int (enqi_bl_cb_t)(struct ldlm_lock *lock,
  40                            struct ldlm_lock_desc *desc, void *data,
  41                            int flag);
  42 static enqi_bl_cb_t qsd_glb_blocking_ast, qsd_id_blocking_ast;
  43
  44 typedef int (enqi_gl_cb_t)(struct ldlm_lock *lock, void *data);
  45 static enqi_gl_cb_t qsd_glb_glimpse_ast, qsd_id_glimpse_ast;
  46
  47 struct ldlm_enqueue_info qsd_glb_einfo = {
  48         .ei_type        = LDLM_PLAIN,
  49         .ei_mode        = LCK_CR,
  50         .ei_cb_bl       = qsd_glb_blocking_ast,
  51         .ei_cb_cp       = ldlm_completion_ast,
  52         .ei_cb_gl       = qsd_glb_glimpse_ast,
  53 };
  54
  55 struct ldlm_enqueue_info qsd_id_einfo = {
  56         .ei_type        = LDLM_PLAIN,
  57         .ei_mode        = LCK_CR,
  58         .ei_cb_bl       = qsd_id_blocking_ast,
  59         .ei_cb_cp       = ldlm_completion_ast,
  60         .ei_cb_gl       = qsd_id_glimpse_ast,
  61 };
  62
  63 /*
  64  * Return qsd_qtype_info structure associated with a global lock
  65  *
  66  * \param lock - is the global lock from which we should extract the qqi
  67  * \param reset - whether lock->l_ast_data should be cleared
  68  */
  69 static struct qsd_qtype_info *qsd_glb_ast_data_get(struct ldlm_lock *lock,
  70                                                    bool reset) {
  71         struct qsd_qtype_info *qqi;
  72         ENTRY;
  73
  74         lock_res_and_lock(lock);
  75         qqi = lock->l_ast_data;
  76         if (qqi != NULL) {
  77                 qqi_getref(qqi);
  78                 if (reset)
  79                         lock->l_ast_data = NULL;
  80         }
  81         unlock_res_and_lock(lock);
  82
  83         if (qqi != NULL)
  84                 /* it is not safe to call lu_ref_add() under spinlock */
  85                 lu_ref_add(&qqi->qqi_reference, "ast_data_get", lock);
  86
  87         if (reset && qqi != NULL) {
  88                 /* release qqi reference hold for the lock */
  89                 lu_ref_del(&qqi->qqi_reference, "glb_lock", lock);
  90                 qqi_putref(qqi);
  91         }
  92         RETURN(qqi);
  93 }
  94
  95 /*
  96  * Return lquota entry structure associated with a per-ID lock
  97  *
  98  * \param lock - is the per-ID lock from which we should extract the lquota
  99  *               entry
 100  * \param reset - whether lock->l_ast_data should be cleared
 101  */
 102 static struct lquota_entry *qsd_id_ast_data_get(struct ldlm_lock *lock,
 103                                                 bool reset) {
 104         struct lquota_entry *lqe;
 105         ENTRY;
 106
 107         lock_res_and_lock(lock);
 108         lqe = lock->l_ast_data;
 109         if (lqe != NULL) {
 110                 lqe_getref(lqe);
 111                 if (reset)
 112                         lock->l_ast_data = NULL;
 113         }
 114         unlock_res_and_lock(lock);
 115
 116         if (reset && lqe != NULL)
 117                 /* release lqe reference hold for the lock */
 118                 lqe_putref(lqe);
 119         RETURN(lqe);
 120 }
 121
 122 /*
 123  * Glimpse callback handler for all quota locks. This function extracts
 124  * information from the glimpse request.
 125  *
 126  * \param lock - is the lock targeted by the glimpse
 127  * \param data - is a pointer to the glimpse ptlrpc request
 128  * \param req  - is the glimpse request
 129  * \param desc - is the glimpse descriptor describing the purpose of the glimpse
 130  *               request.
 131  * \param lvb  - is the pointer to the lvb in the reply buffer
 132  *
 133  * \retval 0 on success and \desc, \lvb & \arg point to a valid structures,
 134  *         appropriate error on failure
 135  */
 136 static int qsd_common_glimpse_ast(struct ptlrpc_request *req,
 137                                   struct ldlm_gl_lquota_desc **desc, void **lvb)
 138 {
 139         int rc;
 140         ENTRY;
 141
 142         LASSERT(lustre_msg_get_opc(req->rq_reqmsg) == LDLM_GL_CALLBACK);
 143
 144         /* glimpse on quota locks always packs a glimpse descriptor */
 145         req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK_DESC);
 146
 147         /* extract glimpse descriptor */
 148         *desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
 149         if (*desc == NULL)
 150                 RETURN(-EFAULT);
 151
 152         if (ptlrpc_req_need_swab(req))
 153                 lustre_swab_gl_lquota_desc(*desc);
 154
 155         /* prepare reply */
 156         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
 157                              sizeof(struct lquota_lvb));
 158         rc = req_capsule_server_pack(&req->rq_pill);
 159         if (rc != 0) {
 160                 CERROR("Can't pack response, rc %d\n", rc);
 161                 RETURN(rc);
 162         }
 163
 164         /* extract lvb */
 165         *lvb = req_capsule_server_get(&req->rq_pill, &RMF_DLM_LVB);
 166
 167         RETURN(0);
 168 }
 169
 170 /*
 171  * Blocking callback handler for global index lock
 172  *
 173  * \param lock - is the lock for which ast occurred.
 174  * \param desc - is the description of a conflicting lock in case of blocking
 175  *               ast.
 176  * \param data - is the value of lock->l_ast_data
 177  * \param flag - LDLM_CB_BLOCKING or LDLM_CB_CANCELING. Used to distinguish
 178  *               cancellation and blocking ast's.
 179  */
 180 static int qsd_glb_blocking_ast(struct ldlm_lock *lock,
 181                                 struct ldlm_lock_desc *desc, void *data,
 182                                 int flag)
 183 {
 184         int rc = 0;
 185         ENTRY;
 186
 187         switch(flag) {
 188         case LDLM_CB_BLOCKING: {
 189                 struct lustre_handle lockh;
 190
 191                 LDLM_DEBUG(lock, "blocking AST on global quota lock");
 192                 ldlm_lock2handle(lock, &lockh);
 193                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 194                 break;
 195         }
 196         case LDLM_CB_CANCELING: {
 197                 struct qsd_qtype_info *qqi;
 198
 199                 LDLM_DEBUG(lock, "canceling global quota lock");
 200
 201                 qqi = qsd_glb_ast_data_get(lock, true);
 202                 if (qqi == NULL)
 203                         break;
 204
 205                 /* we are losing the global index lock, so let's mark the
 206                  * global & slave indexes as not up-to-date any more */
 207                 write_lock(&qqi->qqi_qsd->qsd_lock);
 208                 qqi->qqi_glb_uptodate = false;
 209                 qqi->qqi_slv_uptodate = false;
 210                 if (lock->l_handle.h_cookie == qqi->qqi_lockh.cookie)
 211                         memset(&qqi->qqi_lockh, 0, sizeof(qqi->qqi_lockh));
 212                 write_unlock(&qqi->qqi_qsd->qsd_lock);
 213
 214                 CDEBUG(D_QUOTA, "%s: losing global index lock for %s type\n",
 215                        qqi->qqi_qsd->qsd_svname, qtype_name((qqi->qqi_qtype)));
 216
 217                 /* kick off reintegration thread if not running already, if
 218                  * it's just local cancel (for stack clean up or eviction),
 219                  * don't re-trigger the reintegration. */
 220                 if (!ldlm_is_local_only(lock))
 221                         qsd_start_reint_thread(qqi);
 222
 223                 lu_ref_del(&qqi->qqi_reference, "ast_data_get", lock);
 224                 qqi_putref(qqi);
 225                 break;
 226         }
 227         default:
 228                 LASSERTF(0, "invalid flags for blocking ast %d\n", flag);
 229         }
 230
 231         RETURN(rc);
 232 }
 233
 234 /*
 235  * Glimpse callback handler for global quota lock.
 236  *
 237  * \param lock - is the lock targeted by the glimpse
 238  * \param data - is a pointer to the glimpse ptlrpc request
 239  */
 240 static int qsd_glb_glimpse_ast(struct ldlm_lock *lock, void *data)
 241 {
 242         struct ptlrpc_request           *req = data;
 243         struct qsd_qtype_info           *qqi;
 244         struct ldlm_gl_lquota_desc      *desc;
 245         struct lquota_lvb               *lvb;
 246         struct lquota_glb_rec            rec;
 247         int                              rc;
 248         ENTRY;
 249
 250         rc = qsd_common_glimpse_ast(req, &desc, (void **)&lvb);
 251         if (rc)
 252                 GOTO(out, rc);
 253
 254         qqi = qsd_glb_ast_data_get(lock, false);
 255         if (qqi == NULL)
 256                 /* valid race */
 257                 GOTO(out, rc = -ELDLM_NO_LOCK_DATA);
 258
 259         CDEBUG(D_QUOTA, "%s: glimpse on glb quota locks, id:%llu ver:%llu"
 260                " hard:" "%llu soft:%llu\n", qqi->qqi_qsd->qsd_svname,
 261                desc->gl_id.qid_uid, desc->gl_ver, desc->gl_hardlimit,
 262                desc->gl_softlimit);
 263
 264         if (desc->gl_ver == 0) {
 265                 CERROR("%s: invalid global index version %llu\n",
 266                        qqi->qqi_qsd->qsd_svname, desc->gl_ver);
 267                 GOTO(out_qqi, rc = -EINVAL);
 268         }
 269
 270         /* extract new hard & soft limits from the glimpse descriptor */
 271         rec.qbr_hardlimit = desc->gl_hardlimit;
 272         rec.qbr_softlimit = desc->gl_softlimit;
 273         rec.qbr_time      = desc->gl_time;
 274         rec.qbr_granted   = 0;
 275
 276         /* We can't afford disk io in the context of glimpse callback handling
 277          * thread, so the on-disk global limits update has to be deferred. */
 278         qsd_upd_schedule(qqi, NULL, &desc->gl_id, (union lquota_rec *)&rec,
 279                          desc->gl_ver, true);
 280         EXIT;
 281 out_qqi:
 282         lu_ref_del(&qqi->qqi_reference, "ast_data_get", lock);
 283         qqi_putref(qqi);
 284 out:
 285         req->rq_status = rc;
 286         return rc;
 287 }
 288
 289 /**
 290  * Blocking callback handler for per-ID lock
 291  *
 292  * \param lock - is the lock for which ast occurred.
 293  * \param desc - is the description of a conflicting lock in case of blocking
 294  *               ast.
 295  * \param data - is the value of lock->l_ast_data
 296  * \param flag - LDLM_CB_BLOCKING or LDLM_CB_CANCELING. Used to distinguish
 297  *               cancellation and blocking ast's.
 298  */
 299 static int qsd_id_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 300                                void *data, int flag)
 301 {
 302         struct lustre_handle    lockh;
 303         int                     rc = 0;
 304         ENTRY;
 305
 306         switch(flag) {
 307         case LDLM_CB_BLOCKING: {
 308
 309                 LDLM_DEBUG(lock, "blocking AST on ID quota lock");
 310                 ldlm_lock2handle(lock, &lockh);
 311                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 312                 break;
 313         }
 314         case LDLM_CB_CANCELING: {
 315                 struct lu_env           *env;
 316                 struct lquota_entry     *lqe;
 317
 318                 LDLM_DEBUG(lock, "canceling ID quota lock");
 319                 lqe = qsd_id_ast_data_get(lock, true);
 320                 if (lqe == NULL)
 321                         break;
 322
 323                 LQUOTA_DEBUG(lqe, "losing ID lock");
 324
 325                 ldlm_lock2handle(lock, &lockh);
 326                 lqe_write_lock(lqe);
 327                 if (lustre_handle_equal(&lockh, &lqe->lqe_lockh)) {
 328                         /* Clear lqe_lockh & reset qunit to 0 */
 329                         qsd_set_qunit(lqe, 0);
 330                         memset(&lqe->lqe_lockh, 0, sizeof(lqe->lqe_lockh));
 331                         qsd_set_edquot(lqe, false);
 332                 }
 333                 lqe_write_unlock(lqe);
 334
 335                 /* If there is dqacq inflight, the release will be skipped
 336                  * at this time, and triggered on dqacq completion later,
 337                  * which means there could be a short window that slave is
 338                  * holding spare grant wihtout per-ID lock. */
 339
 340                 /* don't release quota space for local cancel (stack clean
 341                  * up or eviction) */
 342                 if (!ldlm_is_local_only(lock)) {
 343                         /* allocate environment */
 344                         OBD_ALLOC_PTR(env);
 345                         if (env == NULL) {
 346                                 lqe_putref(lqe);
 347                                 rc = -ENOMEM;
 348                                 break;
 349                         }
 350
 351                         /* initialize environment */
 352                         rc = lu_env_init(env, LCT_DT_THREAD);
 353                         if (rc) {
 354                                 OBD_FREE_PTR(env);
 355                                 lqe_putref(lqe);
 356                                 break;
 357                         }
 358
 359                         rc = qsd_adjust(env, lqe);
 360
 361                         lu_env_fini(env);
 362                         OBD_FREE_PTR(env);
 363                 }
 364
 365                 /* release lqe reference grabbed by qsd_id_ast_data_get() */
 366                 lqe_putref(lqe);
 367                 break;
 368         }
 369         default:
 370                 LASSERTF(0, "invalid flags for blocking ast %d\n", flag);
 371         }
 372
 373         RETURN(rc);
 374 }
 375
 376 /*
 377  * Glimpse callback handler for per-ID quota locks.
 378  *
 379  * \param lock - is the lock targeted by the glimpse
 380  * \param data - is a pointer to the glimpse ptlrpc request
 381  */
 382 static int qsd_id_glimpse_ast(struct ldlm_lock *lock, void *data)
 383 {
 384         struct ptlrpc_request           *req = data;
 385         struct lquota_entry             *lqe;
 386         struct ldlm_gl_lquota_desc      *desc;
 387         struct lquota_lvb               *lvb;
 388         int                              rc;
 389         bool                             wakeup = false;
 390         ENTRY;
 391
 392         rc = qsd_common_glimpse_ast(req, &desc, (void **)&lvb);
 393         if (rc)
 394                 GOTO(out, rc);
 395
 396         lqe = qsd_id_ast_data_get(lock, false);
 397         if (lqe == NULL)
 398                 /* valid race */
 399                 GOTO(out, rc = -ELDLM_NO_LOCK_DATA);
 400
 401         LQUOTA_DEBUG(lqe, "glimpse on quota locks, new qunit:%llu",
 402                      desc->gl_qunit);
 403
 404         lqe_write_lock(lqe);
 405         lvb->lvb_id_rel = 0;
 406         if (desc->gl_qunit != 0 && desc->gl_qunit != lqe->lqe_qunit) {
 407                 long long space;
 408
 409                 /* extract new qunit from glimpse request */
 410                 qsd_set_qunit(lqe, desc->gl_qunit);
 411
 412                 space  = lqe->lqe_granted - lqe->lqe_pending_rel;
 413                 space -= lqe->lqe_usage;
 414                 space -= lqe->lqe_pending_write + lqe->lqe_waiting_write;
 415                 space -= lqe->lqe_qunit;
 416
 417                 if (space > 0) {
 418                         if (lqe->lqe_pending_req > 0) {
 419                                 LQUOTA_DEBUG(lqe, "request in flight, postpone "
 420                                              "release of %lld", space);
 421                                 lvb->lvb_id_may_rel = space;
 422                         } else {
 423                                 lqe->lqe_pending_req++;
 424
 425                                 /* release quota space in glimpse reply */
 426                                 LQUOTA_DEBUG(lqe, "releasing %lld", space);
 427                                 lqe->lqe_granted -= space;
 428                                 lvb->lvb_id_rel   = space;
 429
 430                                 lqe_write_unlock(lqe);
 431                                 /* change the lqe_granted */
 432                                 qsd_upd_schedule(lqe2qqi(lqe), lqe, &lqe->lqe_id,
 433                                                  (union lquota_rec *)&lqe->lqe_granted,
 434                                                  0, false);
 435                                 lqe_write_lock(lqe);
 436
 437                                 lqe->lqe_pending_req--;
 438                                 wakeup = true;
 439                         }
 440                 }
 441         }
 442
 443         qsd_set_edquot(lqe, !!(desc->gl_flags & LQUOTA_FL_EDQUOT));
 444         lqe_write_unlock(lqe);
 445
 446         if (wakeup)
 447                 wake_up_all(&lqe->lqe_waiters);
 448         lqe_putref(lqe);
 449 out:
 450         req->rq_status = rc;
 451         RETURN(rc);
 452 }
 453
 454 /**
 455  * Check whether a slave already own a ldlm lock for the quota identifier \qid.
 456  *
 457  * \param lockh  - is the local lock handle from lquota entry.
 458  * \param rlockh - is the remote lock handle of the matched lock, if any.
 459  *
 460  * \retval 0      : on successful look up and \lockh contains the lock handle.
 461  * \retval -ENOENT: no lock found
 462  */
 463 int qsd_id_lock_match(struct lustre_handle *lockh, struct lustre_handle *rlockh)
 464 {
 465         struct ldlm_lock        *lock;
 466         int                      rc;
 467         ENTRY;
 468
 469         LASSERT(lockh);
 470
 471         if (!lustre_handle_is_used(lockh))
 472                 RETURN(-ENOENT);
 473
 474         rc = ldlm_lock_addref_try(lockh, qsd_id_einfo.ei_mode);
 475         if (rc)
 476                 RETURN(-ENOENT);
 477
 478         LASSERT(lustre_handle_is_used(lockh));
 479         ldlm_lock_dump_handle(D_QUOTA, lockh);
 480
 481         if (rlockh == NULL)
 482                 /* caller not interested in remote handle */
 483                 RETURN(0);
 484
 485         /* look up lock associated with local handle and extract remote handle
 486          * to be packed in quota request */
 487         lock = ldlm_handle2lock(lockh);
 488         LASSERT(lock != NULL);
 489         lustre_handle_copy(rlockh, &lock->l_remote_handle);
 490         LDLM_LOCK_PUT(lock);
 491
 492         RETURN(0);
 493 }
 494
 495 int qsd_id_lock_cancel(const struct lu_env *env, struct lquota_entry *lqe)
 496 {
 497         struct qsd_thread_info  *qti = qsd_info(env);
 498         int                      rc;
 499         ENTRY;
 500
 501         lqe_write_lock(lqe);
 502         if (lqe->lqe_pending_write || lqe->lqe_waiting_write ||
 503             lqe->lqe_usage || lqe->lqe_granted) {
 504                 lqe_write_unlock(lqe);
 505                 RETURN(0);
 506         }
 507
 508         lustre_handle_copy(&qti->qti_lockh, &lqe->lqe_lockh);
 509         if (lustre_handle_is_used(&qti->qti_lockh)) {
 510                 memset(&lqe->lqe_lockh, 0, sizeof(lqe->lqe_lockh));
 511                 qsd_set_qunit(lqe, 0);
 512                 qsd_set_edquot(lqe, false);
 513         }
 514         lqe_write_unlock(lqe);
 515
 516         rc = qsd_id_lock_match(&qti->qti_lockh, NULL);
 517         if (rc)
 518                 RETURN(rc);
 519
 520         ldlm_lock_decref_and_cancel(&qti->qti_lockh, qsd_id_einfo.ei_mode);
 521         RETURN(0);
 522 }