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, 2013, 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
  36 #include "qsd_internal.h"
  37
  38 typedef int (enqi_bl_cb_t)(struct ldlm_lock *lock,
  39                            struct ldlm_lock_desc *desc, void *data,
  40                            int flag);
  41 static enqi_bl_cb_t qsd_glb_blocking_ast, qsd_id_blocking_ast;
  42
  43 typedef int (enqi_gl_cb_t)(struct ldlm_lock *lock, void *data);
  44 static enqi_gl_cb_t qsd_glb_glimpse_ast, qsd_id_glimpse_ast;
  45
  46 struct ldlm_enqueue_info qsd_glb_einfo = {
  47         .ei_type        = LDLM_PLAIN,
  48         .ei_mode        = LCK_CR,
  49         .ei_cb_bl       = qsd_glb_blocking_ast,
  50         .ei_cb_cp       = ldlm_completion_ast,
  51         .ei_cb_gl       = qsd_glb_glimpse_ast,
  52 };
  53
  54 struct ldlm_enqueue_info qsd_id_einfo = {
  55         .ei_type        = LDLM_PLAIN,
  56         .ei_mode        = LCK_CR,
  57         .ei_cb_bl       = qsd_id_blocking_ast,
  58         .ei_cb_cp       = ldlm_completion_ast,
  59         .ei_cb_gl       = qsd_id_glimpse_ast,
  60 };
  61
  62 /*
  63  * Return qsd_qtype_info structure associated with a global lock
  64  *
  65  * \param lock - is the global lock from which we should extract the qqi
  66  * \param reset - whether lock->l_ast_data should be cleared
  67  */
  68 static struct qsd_qtype_info *qsd_glb_ast_data_get(struct ldlm_lock *lock,
  69                                                    bool reset) {
  70         struct qsd_qtype_info *qqi;
  71         ENTRY;
  72
  73         lock_res_and_lock(lock);
  74         qqi = lock->l_ast_data;
  75         if (qqi != NULL) {
  76                 qqi_getref(qqi);
  77                 if (reset)
  78                         lock->l_ast_data = NULL;
  79         }
  80         unlock_res_and_lock(lock);
  81
  82         if (qqi != NULL)
  83                 /* it is not safe to call lu_ref_add() under spinlock */
  84                 lu_ref_add(&qqi->qqi_reference, "ast_data_get", lock);
  85
  86         if (reset && qqi != NULL) {
  87                 /* release qqi reference hold for the lock */
  88                 lu_ref_del(&qqi->qqi_reference, "glb_lock", lock);
  89                 qqi_putref(qqi);
  90         }
  91         RETURN(qqi);
  92 }
  93
  94 /*
  95  * Return lquota entry structure associated with a per-ID lock
  96  *
  97  * \param lock - is the per-ID lock from which we should extract the lquota
  98  *               entry
  99  * \param reset - whether lock->l_ast_data should be cleared
 100  */
 101 static struct lquota_entry *qsd_id_ast_data_get(struct ldlm_lock *lock,
 102                                                 bool reset) {
 103         struct lquota_entry *lqe;
 104         ENTRY;
 105
 106         lock_res_and_lock(lock);
 107         lqe = lock->l_ast_data;
 108         if (lqe != NULL) {
 109                 lqe_getref(lqe);
 110                 if (reset)
 111                         lock->l_ast_data = NULL;
 112         }
 113         unlock_res_and_lock(lock);
 114
 115         if (reset && lqe != NULL)
 116                 /* release lqe reference hold for the lock */
 117                 lqe_putref(lqe);
 118         RETURN(lqe);
 119 }
 120
 121 /*
 122  * Glimpse callback handler for all quota locks. This function extracts
 123  * information from the glimpse request.
 124  *
 125  * \param lock - is the lock targeted by the glimpse
 126  * \param data - is a pointer to the glimpse ptlrpc request
 127  * \param req  - is the glimpse request
 128  * \param desc - is the glimpse descriptor describing the purpose of the glimpse
 129  *               request.
 130  * \param lvb  - is the pointer to the lvb in the reply buffer
 131  *
 132  * \retval 0 on success and \desc, \lvb & \arg point to a valid structures,
 133  *         appropriate error on failure
 134  */
 135 static int qsd_common_glimpse_ast(struct ptlrpc_request *req,
 136                                   struct ldlm_gl_lquota_desc **desc, void **lvb)
 137 {
 138         int rc;
 139         ENTRY;
 140
 141         LASSERT(lustre_msg_get_opc(req->rq_reqmsg) == LDLM_GL_CALLBACK);
 142
 143         /* glimpse on quota locks always packs a glimpse descriptor */
 144         req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_DESC_CALLBACK);
 145
 146         /* extract glimpse descriptor */
 147         *desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
 148         if (*desc == NULL)
 149                 RETURN(-EFAULT);
 150
 151         /* prepare reply */
 152         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
 153                              sizeof(struct lquota_lvb));
 154         rc = req_capsule_server_pack(&req->rq_pill);
 155         if (rc != 0) {
 156                 CERROR("Can't pack response, rc %d\n", rc);
 157                 RETURN(rc);
 158         }
 159
 160         /* extract lvb */
 161         *lvb = req_capsule_server_get(&req->rq_pill, &RMF_DLM_LVB);
 162
 163         RETURN(0);
 164 }
 165
 166 /*
 167  * Blocking callback handler for global index lock
 168  *
 169  * \param lock - is the lock for which ast occurred.
 170  * \param desc - is the description of a conflicting lock in case of blocking
 171  *               ast.
 172  * \param data - is the value of lock->l_ast_data
 173  * \param flag - LDLM_CB_BLOCKING or LDLM_CB_CANCELING. Used to distinguish
 174  *               cancellation and blocking ast's.
 175  */
 176 static int qsd_glb_blocking_ast(struct ldlm_lock *lock,
 177                                 struct ldlm_lock_desc *desc, void *data,
 178                                 int flag)
 179 {
 180         int rc = 0;
 181         ENTRY;
 182
 183         switch(flag) {
 184         case LDLM_CB_BLOCKING: {
 185                 struct lustre_handle lockh;
 186
 187                 LDLM_DEBUG(lock, "blocking AST on global quota lock");
 188                 ldlm_lock2handle(lock, &lockh);
 189                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 190                 break;
 191         }
 192         case LDLM_CB_CANCELING: {
 193                 struct qsd_qtype_info *qqi;
 194
 195                 LDLM_DEBUG(lock, "canceling global quota lock");
 196
 197                 qqi = qsd_glb_ast_data_get(lock, true);
 198                 if (qqi == NULL)
 199                         break;
 200
 201                 /* we are losing the global index lock, so let's mark the
 202                  * global & slave indexes as not up-to-date any more */
 203                 write_lock(&qqi->qqi_qsd->qsd_lock);
 204                 qqi->qqi_glb_uptodate = false;
 205                 qqi->qqi_slv_uptodate = false;
 206                 if (lock->l_handle.h_cookie == qqi->qqi_lockh.cookie)
 207                         memset(&qqi->qqi_lockh, 0, sizeof(qqi->qqi_lockh));
 208                 write_unlock(&qqi->qqi_qsd->qsd_lock);
 209
 210                 CDEBUG(D_QUOTA, "%s: losing global index lock for %s type\n",
 211                        qqi->qqi_qsd->qsd_svname, QTYPE_NAME((qqi->qqi_qtype)));
 212
 213                 /* kick off reintegration thread if not running already, if
 214                  * it's just local cancel (for stack clean up or eviction),
 215                  * don't re-trigger the reintegration. */
 216                 if (!ldlm_is_local_only(lock))
 217                         qsd_start_reint_thread(qqi);
 218
 219                 lu_ref_del(&qqi->qqi_reference, "ast_data_get", lock);
 220                 qqi_putref(qqi);
 221                 break;
 222         }
 223         default:
 224                 LASSERTF(0, "invalid flags for blocking ast %d", flag);
 225         }
 226
 227         RETURN(rc);
 228 }
 229
 230 /*
 231  * Glimpse callback handler for global quota lock.
 232  *
 233  * \param lock - is the lock targeted by the glimpse
 234  * \param data - is a pointer to the glimpse ptlrpc request
 235  */
 236 static int qsd_glb_glimpse_ast(struct ldlm_lock *lock, void *data)
 237 {
 238         struct ptlrpc_request           *req = data;
 239         struct qsd_qtype_info           *qqi;
 240         struct ldlm_gl_lquota_desc      *desc;
 241         struct lquota_lvb               *lvb;
 242         struct lquota_glb_rec            rec;
 243         int                              rc;
 244         ENTRY;
 245
 246         rc = qsd_common_glimpse_ast(req, &desc, (void **)&lvb);
 247         if (rc)
 248                 GOTO(out, rc);
 249
 250         qqi = qsd_glb_ast_data_get(lock, false);
 251         if (qqi == NULL)
 252                 /* valid race */
 253                 GOTO(out, rc = -ELDLM_NO_LOCK_DATA);
 254
 255         CDEBUG(D_QUOTA, "%s: glimpse on glb quota locks, id:"LPU64" ver:"LPU64
 256                " hard:" LPU64" soft:"LPU64"\n", qqi->qqi_qsd->qsd_svname,
 257                desc->gl_id.qid_uid, desc->gl_ver, desc->gl_hardlimit,
 258                desc->gl_softlimit);
 259
 260         if (desc->gl_ver == 0) {
 261                 CERROR("%s: invalid global index version "LPU64"\n",
 262                        qqi->qqi_qsd->qsd_svname, desc->gl_ver);
 263                 GOTO(out_qqi, rc = -EINVAL);
 264         }
 265
 266         /* extract new hard & soft limits from the glimpse descriptor */
 267         rec.qbr_hardlimit = desc->gl_hardlimit;
 268         rec.qbr_softlimit = desc->gl_softlimit;
 269         rec.qbr_time      = desc->gl_time;
 270         rec.qbr_granted   = 0;
 271
 272         /* We can't afford disk io in the context of glimpse callback handling
 273          * thread, so the on-disk global limits update has to be deferred. */
 274         qsd_upd_schedule(qqi, NULL, &desc->gl_id, (union lquota_rec *)&rec,
 275                          desc->gl_ver, true);
 276         EXIT;
 277 out_qqi:
 278         lu_ref_del(&qqi->qqi_reference, "ast_data_get", lock);
 279         qqi_putref(qqi);
 280 out:
 281         req->rq_status = rc;
 282         return rc;
 283 }
 284
 285 /**
 286  * Blocking callback handler for per-ID lock
 287  *
 288  * \param lock - is the lock for which ast occurred.
 289  * \param desc - is the description of a conflicting lock in case of blocking
 290  *               ast.
 291  * \param data - is the value of lock->l_ast_data
 292  * \param flag - LDLM_CB_BLOCKING or LDLM_CB_CANCELING. Used to distinguish
 293  *               cancellation and blocking ast's.
 294  */
 295 static int qsd_id_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 296                                void *data, int flag)
 297 {
 298         struct lustre_handle    lockh;
 299         int                     rc = 0;
 300         ENTRY;
 301
 302         switch(flag) {
 303         case LDLM_CB_BLOCKING: {
 304
 305                 LDLM_DEBUG(lock, "blocking AST on ID quota lock");
 306                 ldlm_lock2handle(lock, &lockh);
 307                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 308                 break;
 309         }
 310         case LDLM_CB_CANCELING: {
 311                 struct lu_env           *env;
 312                 struct lquota_entry     *lqe;
 313
 314                 LDLM_DEBUG(lock, "canceling global quota lock");
 315                 lqe = qsd_id_ast_data_get(lock, true);
 316                 if (lqe == NULL)
 317                         break;
 318
 319                 LQUOTA_DEBUG(lqe, "losing ID lock");
 320
 321                 ldlm_lock2handle(lock, &lockh);
 322                 lqe_write_lock(lqe);
 323                 if (lustre_handle_equal(&lockh, &lqe->lqe_lockh)) {
 324                         /* Clear lqe_lockh & reset qunit to 0 */
 325                         qsd_set_qunit(lqe, 0);
 326                         memset(&lqe->lqe_lockh, 0, sizeof(lqe->lqe_lockh));
 327                         qsd_set_edquot(lqe, false);
 328                 }
 329                 lqe_write_unlock(lqe);
 330
 331                 /* If there is dqacq inflight, the release will be skipped
 332                  * at this time, and triggered on dqacq completion later,
 333                  * which means there could be a short window that slave is
 334                  * holding spare grant wihtout per-ID lock. */
 335
 336                 /* don't release quota space for local cancel (stack clean
 337                  * up or eviction) */
 338                 if (!ldlm_is_local_only(lock)) {
 339                         /* allocate environment */
 340                         OBD_ALLOC_PTR(env);
 341                         if (env == NULL) {
 342                                 lqe_putref(lqe);
 343                                 rc = -ENOMEM;
 344                                 break;
 345                         }
 346
 347                         /* initialize environment */
 348                         rc = lu_env_init(env, LCT_DT_THREAD);
 349                         if (rc) {
 350                                 OBD_FREE_PTR(env);
 351                                 lqe_putref(lqe);
 352                                 break;
 353                         }
 354
 355                         rc = qsd_adjust(env, lqe);
 356
 357                         lu_env_fini(env);
 358                         OBD_FREE_PTR(env);
 359                 }
 360
 361                 /* release lqe reference grabbed by qsd_id_ast_data_get() */
 362                 lqe_putref(lqe);
 363                 break;
 364         }
 365         default:
 366                 LASSERTF(0, "invalid flags for blocking ast %d", flag);
 367         }
 368
 369         RETURN(rc);
 370 }
 371
 372 /*
 373  * Glimpse callback handler for per-ID quota locks.
 374  *
 375  * \param lock - is the lock targeted by the glimpse
 376  * \param data - is a pointer to the glimpse ptlrpc request
 377  */
 378 static int qsd_id_glimpse_ast(struct ldlm_lock *lock, void *data)
 379 {
 380         struct ptlrpc_request           *req = data;
 381         struct lquota_entry             *lqe;
 382         struct qsd_instance             *qsd;
 383         struct ldlm_gl_lquota_desc      *desc;
 384         struct lquota_lvb               *lvb;
 385         int                              rc;
 386         bool                             wakeup = false;
 387         ENTRY;
 388
 389         rc = qsd_common_glimpse_ast(req, &desc, (void **)&lvb);
 390         if (rc)
 391                 GOTO(out, rc);
 392
 393         lqe = qsd_id_ast_data_get(lock, false);
 394         if (lqe == NULL)
 395                 /* valid race */
 396                 GOTO(out, rc = -ELDLM_NO_LOCK_DATA);
 397
 398         LQUOTA_DEBUG(lqe, "glimpse on quota locks, new qunit:"LPU64,
 399                      desc->gl_qunit);
 400
 401         qsd = lqe2qqi(lqe)->qqi_qsd;
 402
 403         lqe_write_lock(lqe);
 404         lvb->lvb_id_rel = 0;
 405         if (desc->gl_qunit != 0 && desc->gl_qunit != lqe->lqe_qunit) {
 406                 long long space;
 407
 408                 /* extract new qunit from glimpse request */
 409                 qsd_set_qunit(lqe, desc->gl_qunit);
 410
 411                 space  = lqe->lqe_granted - lqe->lqe_pending_rel;
 412                 space -= lqe->lqe_usage;
 413                 space -= lqe->lqe_pending_write + lqe->lqe_waiting_write;
 414                 space -= lqe->lqe_qunit;
 415
 416                 if (space > 0) {
 417                         if (lqe->lqe_pending_req > 0) {
 418                                 LQUOTA_DEBUG(lqe, "request in flight, postpone "
 419                                              "release of "LPD64, space);
 420                                 lvb->lvb_id_may_rel = space;
 421                         } else {
 422                                 lqe->lqe_pending_req++;
 423
 424                                 /* release quota space in glimpse reply */
 425                                 LQUOTA_DEBUG(lqe, "releasing "LPD64, space);
 426                                 lqe->lqe_granted -= space;
 427                                 lvb->lvb_id_rel   = space;
 428
 429                                 lqe_write_unlock(lqe);
 430                                 /* change the lqe_granted */
 431                                 qsd_upd_schedule(lqe2qqi(lqe), lqe, &lqe->lqe_id,
 432                                                  (union lquota_rec *)&lqe->lqe_granted,
 433                                                  0, false);
 434                                 lqe_write_lock(lqe);
 435
 436                                 lqe->lqe_pending_req--;
 437                                 wakeup = true;
 438                         }
 439                 }
 440         }
 441
 442         qsd_set_edquot(lqe, !!(desc->gl_flags & LQUOTA_FL_EDQUOT));
 443         lqe_write_unlock(lqe);
 444
 445         if (wakeup)
 446                 wake_up_all(&lqe->lqe_waiters);
 447         lqe_putref(lqe);
 448 out:
 449         req->rq_status = rc;
 450         RETURN(rc);
 451 }
 452
 453 /**
 454  * Check whether a slave already own a ldlm lock for the quota identifier \qid.
 455  *
 456  * \param lockh  - is the local lock handle from lquota entry.
 457  * \param rlockh - is the remote lock handle of the matched lock, if any.
 458  *
 459  * \retval 0      : on successful look up and \lockh contains the lock handle.
 460  * \retval -ENOENT: no lock found
 461  */
 462 int qsd_id_lock_match(struct lustre_handle *lockh, struct lustre_handle *rlockh)
 463 {
 464         struct ldlm_lock        *lock;
 465         int                      rc;
 466         ENTRY;
 467
 468         LASSERT(lockh);
 469
 470         if (!lustre_handle_is_used(lockh))
 471                 RETURN(-ENOENT);
 472
 473         rc = ldlm_lock_addref_try(lockh, qsd_id_einfo.ei_mode);
 474         if (rc)
 475                 RETURN(-ENOENT);
 476
 477         LASSERT(lustre_handle_is_used(lockh));
 478         ldlm_lock_dump_handle(D_QUOTA, lockh);
 479
 480         if (rlockh == NULL)
 481                 /* caller not interested in remote handle */
 482                 RETURN(0);
 483
 484         /* look up lock associated with local handle and extract remote handle
 485          * to be packed in quota request */
 486         lock = ldlm_handle2lock(lockh);
 487         LASSERT(lock != NULL);
 488         lustre_handle_copy(rlockh, &lock->l_remote_handle);
 489         LDLM_LOCK_PUT(lock);
 490
 491         RETURN(0);
 492 }
 493
 494 int qsd_id_lock_cancel(const struct lu_env *env, struct lquota_entry *lqe)
 495 {
 496         struct qsd_thread_info  *qti = qsd_info(env);
 497         int                      rc;
 498         ENTRY;
 499
 500         lqe_write_lock(lqe);
 501         if (lqe->lqe_pending_write || lqe->lqe_waiting_write ||
 502             lqe->lqe_usage || lqe->lqe_granted) {
 503                 lqe_write_unlock(lqe);
 504                 RETURN(0);
 505         }
 506
 507         lustre_handle_copy(&qti->qti_lockh, &lqe->lqe_lockh);
 508         if (lustre_handle_is_used(&qti->qti_lockh)) {
 509                 memset(&lqe->lqe_lockh, 0, sizeof(lqe->lqe_lockh));
 510                 qsd_set_qunit(lqe, 0);
 511                 qsd_set_edquot(lqe, false);
 512         }
 513         lqe_write_unlock(lqe);
 514
 515         rc = qsd_id_lock_match(&qti->qti_lockh, NULL);
 516         if (rc)
 517                 RETURN(rc);
 518
 519         ldlm_lock_decref_and_cancel(&qti->qti_lockh, qsd_id_einfo.ei_mode);
 520         RETURN(0);
 521 }