lustre/ldlm/ldlm_lockd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002 Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * by Cluster File Systems, Inc.
  10  */
  11
  12 #define EXPORT_SYMTAB
  13
  14 #include <linux/version.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <asm/unistd.h>
  18
  19 #define DEBUG_SUBSYSTEM S_LDLM
  20
  21 #include <linux/lustre_dlm.h>
  22
  23 extern kmem_cache_t *ldlm_resource_slab;
  24 extern kmem_cache_t *ldlm_lock_slab;
  25
  26 static int _ldlm_namespace_new(struct obd_device *obddev,
  27                                struct ptlrpc_request *req)
  28 {
  29         struct ldlm_request *dlm_req;
  30         struct ldlm_namespace *ns;
  31         int rc;
  32         ldlm_error_t err;
  33         ENTRY;
  34
  35         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repbuf);
  36         req->rq_repmsg = (struct lustre_msg *)req->rq_repbuf;
  37         if (rc) {
  38                 CERROR("out of memory\n");
  39                 req->rq_status = -ENOMEM;
  40                 RETURN(0);
  41         }
  42         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
  43
  44         err = ldlm_namespace_new(obddev, dlm_req->lock_desc.l_resource.lr_ns_id,
  45                                  &ns);
  46         req->rq_status = err;
  47
  48         CERROR("err = %d\n", err);
  49
  50         RETURN(0);
  51 }
  52
  53 static int _ldlm_enqueue(struct ptlrpc_request *req)
  54 {
  55         struct ldlm_reply *dlm_rep;
  56         struct ldlm_request *dlm_req;
  57         int rc, size = sizeof(*dlm_rep);
  58         ldlm_error_t err;
  59         ENTRY;
  60
  61         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repbuf);
  62         req->rq_repmsg = (struct lustre_msg *)req->rq_repbuf;
  63         if (rc) {
  64                 CERROR("out of memory\n");
  65                 req->rq_status = -ENOMEM;
  66                 RETURN(0);
  67         }
  68         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
  69         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
  70
  71         memcpy(&dlm_rep->lock_extent, &dlm_req->lock_desc.l_extent,
  72                sizeof(dlm_rep->lock_extent));
  73
  74         err = ldlm_local_lock_enqueue(req->rq_obd,
  75                                       dlm_req->lock_desc.l_resource.lr_ns_id,
  76                                       &dlm_req->lock_handle2,
  77                                       dlm_req->lock_desc.l_resource.lr_name,
  78                                       dlm_req->lock_desc.l_resource.lr_type,
  79                                       &dlm_rep->lock_extent,
  80                                       dlm_req->lock_desc.l_req_mode,
  81                                       &dlm_req->flags,
  82                                       //ldlm_cli_callback,
  83                                       NULL,
  84                                       ldlm_cli_callback,
  85                                       lustre_msg_buf(req->rq_reqmsg, 1),
  86                                       req->rq_reqmsg->buflens[1],
  87                                       &dlm_rep->lock_handle);
  88         if (err != -ENOMEM && err != -ELDLM_BAD_NAMESPACE) {
  89                 struct ldlm_lock *lock;
  90                 lock = ldlm_handle2object(&dlm_rep->lock_handle);
  91                 memcpy(&lock->l_peer, &req->rq_peer, sizeof(lock->l_peer));
  92                 memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
  93                        sizeof(lock->l_remote_handle));
  94         }
  95         req->rq_status = err;
  96
  97         CERROR("err = %d\n", err);
  98
  99         RETURN(0);
 100 }
 101
 102 static int _ldlm_convert(struct ptlrpc_request *req)
 103 {
 104         struct ldlm_request *dlm_req;
 105         int rc;
 106         ENTRY;
 107
 108         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repbuf);
 109         req->rq_repmsg = (struct lustre_msg *)req->rq_repbuf;
 110         if (rc) {
 111                 CERROR("out of memory\n");
 112                 req->rq_status = -ENOMEM;
 113                 RETURN(0);
 114         }
 115         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 116
 117         req->rq_status =
 118                 ldlm_local_lock_convert(req->rq_obd, &dlm_req->lock_handle1,
 119                                         dlm_req->lock_desc.l_req_mode,
 120                                         &dlm_req->flags);
 121         RETURN(0);
 122 }
 123
 124 static int _ldlm_cancel(struct ptlrpc_request *req)
 125 {
 126         struct ldlm_request *dlm_req;
 127         int rc;
 128         ENTRY;
 129
 130         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repbuf);
 131         req->rq_repmsg = (struct lustre_msg *)req->rq_repbuf;
 132         if (rc) {
 133                 CERROR("out of memory\n");
 134                 req->rq_status = -ENOMEM;
 135                 RETURN(0);
 136         }
 137         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 138
 139         req->rq_status =
 140                 ldlm_local_lock_cancel(req->rq_obd, &dlm_req->lock_handle1);
 141         RETURN(0);
 142 }
 143
 144 static int _ldlm_callback(struct ptlrpc_request *req)
 145 {
 146         struct ldlm_request *dlm_req;
 147         struct ldlm_lock *lock;
 148         int rc;
 149         ENTRY;
 150
 151         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repbuf);
 152         req->rq_repmsg = (struct lustre_msg *)req->rq_repbuf;
 153         if (rc) {
 154                 CERROR("out of memory\n");
 155                 req->rq_status = -ENOMEM;
 156                 RETURN(0);
 157         }
 158         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 159
 160         lock = ldlm_handle2object(&dlm_req->lock_handle1);
 161         ldlm_lock_dump(lock);
 162
 163         req->rq_status = 0;
 164
 165         RETURN(0);
 166 }
 167
 168 static int ldlm_handle(struct obd_device *dev, struct ptlrpc_service *svc,
 169                        struct ptlrpc_request *req)
 170 {
 171         int rc;
 172         ENTRY;
 173
 174         rc = lustre_unpack_msg(req->rq_reqbuf, req->rq_reqlen);
 175         req->rq_reqmsg = (struct lustre_msg *)req->rq_reqbuf;
 176         if (rc) {
 177                 CERROR("lustre_ldlm: Invalid request\n");
 178                 GOTO(out, rc);
 179         }
 180
 181         if (req->rq_reqmsg->type != PTL_RPC_REQUEST) {
 182                 CERROR("lustre_ldlm: wrong packet type sent %d\n",
 183                        req->rq_reqmsg->type);
 184                 GOTO(out, rc = -EINVAL);
 185         }
 186
 187         switch (req->rq_reqmsg->opc) {
 188         case LDLM_NAMESPACE_NEW:
 189                 CDEBUG(D_INODE, "namespace_new\n");
 190                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_NAMESPACE_NEW, 0);
 191                 rc = _ldlm_namespace_new(dev, req);
 192                 break;
 193
 194         case LDLM_ENQUEUE:
 195                 CDEBUG(D_INODE, "enqueue\n");
 196                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 197                 rc = _ldlm_enqueue(req);
 198                 break;
 199
 200         case LDLM_CONVERT:
 201                 CDEBUG(D_INODE, "convert\n");
 202                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
 203                 rc = _ldlm_convert(req);
 204                 break;
 205
 206         case LDLM_CANCEL:
 207                 CDEBUG(D_INODE, "cancel\n");
 208                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 209                 rc = _ldlm_cancel(req);
 210                 break;
 211
 212         case LDLM_CALLBACK:
 213                 CDEBUG(D_INODE, "callback\n");
 214                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CALLBACK, 0);
 215                 rc = _ldlm_callback(req);
 216                 break;
 217
 218         default:
 219                 rc = ptlrpc_error(svc, req);
 220                 RETURN(rc);
 221         }
 222
 223 out:
 224         if (rc)
 225                 RETURN(ptlrpc_error(svc, req));
 226         else
 227                 RETURN(ptlrpc_reply(svc, req));
 228 }
 229
 230 static int ldlm_iocontrol(int cmd, struct obd_conn *conn, int len, void *karg,
 231                           void *uarg)
 232 {
 233         struct obd_device *obddev = conn->oc_dev;
 234         int err;
 235         ENTRY;
 236
 237         if (_IOC_TYPE(cmd) != IOC_LDLM_TYPE || _IOC_NR(cmd) < IOC_LDLM_MIN_NR ||
 238             _IOC_NR(cmd) > IOC_LDLM_MAX_NR) {
 239                 CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
 240                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 241                 RETURN(-EINVAL);
 242         }
 243
 244         switch (cmd) {
 245         case IOC_LDLM_TEST: {
 246                 err = ldlm_test(obddev);
 247                 CERROR("-- done err %d\n", err);
 248                 GOTO(out, err);
 249         }
 250         default:
 251                 GOTO(out, err = -EINVAL);
 252         }
 253
 254  out:
 255         return err;
 256 }
 257
 258 static int ldlm_setup(struct obd_device *obddev, obd_count len, void *data)
 259 {
 260         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 261         int err;
 262         ENTRY;
 263
 264         INIT_LIST_HEAD(&obddev->u.ldlm.ldlm_namespaces);
 265         obddev->u.ldlm.ldlm_lock = SPIN_LOCK_UNLOCKED;
 266
 267         ldlm->ldlm_service = ptlrpc_init_svc(64 * 1024,
 268                                              LDLM_REQUEST_PORTAL,
 269                                              LDLM_REPLY_PORTAL,
 270                                              "self", ldlm_handle);
 271         if (!ldlm->ldlm_service)
 272                 LBUG();
 273
 274         err = ptlrpc_start_thread(obddev, ldlm->ldlm_service, "lustre_dlm");
 275         if (err) {
 276                 CERROR("cannot start thread\n");
 277                 LBUG();
 278         }
 279
 280         OBD_ALLOC(ldlm->ldlm_client, sizeof(*ldlm->ldlm_client));
 281         if (ldlm->ldlm_client == NULL)
 282                 LBUG();
 283
 284         ptlrpc_init_client(-1, LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
 285                            ldlm->ldlm_client);
 286         err = ptlrpc_connect_client("ldlm", ldlm->ldlm_client,
 287                                     &ldlm->ldlm_server_peer);
 288         if (err) {
 289                 CERROR("cannot create client\n");
 290                 LBUG();
 291         }
 292
 293         MOD_INC_USE_COUNT;
 294         RETURN(0);
 295 }
 296
 297 static int cleanup_resource(struct ldlm_resource *res, struct list_head *q)
 298 {
 299         struct list_head *tmp, *pos;
 300         int rc = 0;
 301
 302         list_for_each_safe(tmp, pos, q) {
 303                 struct ldlm_lock *lock;
 304
 305                 if (rc) {
 306                         /* Res was already cleaned up. */
 307                         LBUG();
 308                 }
 309
 310                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 311
 312                 ldlm_resource_del_lock(lock);
 313                 ldlm_lock_free(lock);
 314                 rc = ldlm_resource_put(res);
 315         }
 316
 317         return rc;
 318 }
 319
 320 static int do_free_namespace(struct ldlm_namespace *ns)
 321 {
 322         struct list_head *tmp, *pos;
 323         int i, rc;
 324
 325         for (i = 0; i < RES_HASH_SIZE; i++) {
 326                 list_for_each_safe(tmp, pos, &(ns->ns_hash[i])) {
 327                         struct ldlm_resource *res;
 328                         res = list_entry(tmp, struct ldlm_resource, lr_hash);
 329                         list_del_init(&res->lr_hash);
 330
 331                         rc = cleanup_resource(res, &res->lr_granted);
 332                         if (!rc)
 333                                 rc = cleanup_resource(res, &res->lr_converting);
 334                         if (!rc)
 335                                 rc = cleanup_resource(res, &res->lr_waiting);
 336
 337                         while (rc == 0)
 338                                 rc = ldlm_resource_put(res);
 339                 }
 340         }
 341
 342         return ldlm_namespace_free(ns);
 343 }
 344
 345 static int ldlm_free_all(struct obd_device *obddev)
 346 {
 347         struct list_head *tmp, *pos;
 348         int rc = 0;
 349
 350         ldlm_lock(obddev);
 351
 352         list_for_each_safe(tmp, pos, &obddev->u.ldlm.ldlm_namespaces) {
 353                 struct ldlm_namespace *ns;
 354                 ns = list_entry(tmp, struct ldlm_namespace, ns_link);
 355
 356                 rc |= do_free_namespace(ns);
 357         }
 358
 359         ldlm_unlock(obddev);
 360
 361         return rc;
 362 }
 363
 364 static int ldlm_cleanup(struct obd_device *obddev)
 365 {
 366         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 367         ENTRY;
 368
 369         ptlrpc_stop_thread(ldlm->ldlm_service);
 370         rpc_unregister_service(ldlm->ldlm_service);
 371
 372         if (!list_empty(&ldlm->ldlm_service->srv_reqs)) {
 373                 // XXX reply with errors and clean up
 374                 CERROR("Request list not empty!\n");
 375         }
 376
 377         OBD_FREE(ldlm->ldlm_client, sizeof(*ldlm->ldlm_client));
 378         OBD_FREE(ldlm->ldlm_service, sizeof(*ldlm->ldlm_service));
 379
 380         if (ldlm_free_all(obddev)) {
 381                 CERROR("ldlm_free_all could not complete.\n");
 382                 RETURN(-1);
 383         }
 384
 385         MOD_DEC_USE_COUNT;
 386         RETURN(0);
 387 }
 388
 389 struct obd_ops ldlm_obd_ops = {
 390         o_iocontrol:   ldlm_iocontrol,
 391         o_setup:       ldlm_setup,
 392         o_cleanup:     ldlm_cleanup,
 393         o_connect:     gen_connect,
 394         o_disconnect:  gen_disconnect
 395 };
 396
 397
 398 static int __init ldlm_init(void)
 399 {
 400         int rc = obd_register_type(&ldlm_obd_ops, OBD_LDLM_DEVICENAME);
 401         if (rc != 0)
 402                 return rc;
 403
 404         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
 405                                                sizeof(struct ldlm_resource), 0,
 406                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 407         if (ldlm_resource_slab == NULL)
 408                 return -ENOMEM;
 409
 410         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
 411                                            sizeof(struct ldlm_lock), 0,
 412                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
 413         if (ldlm_lock_slab == NULL) {
 414                 kmem_cache_destroy(ldlm_resource_slab);
 415                 return -ENOMEM;
 416         }
 417
 418         return 0;
 419 }
 420
 421 static void __exit ldlm_exit(void)
 422 {
 423         obd_unregister_type(OBD_LDLM_DEVICENAME);
 424         kmem_cache_destroy(ldlm_resource_slab);
 425         kmem_cache_destroy(ldlm_lock_slab);
 426 }
 427
 428 MODULE_AUTHOR("Cluster File Systems, Inc. <braam@clusterfs.com>");
 429 MODULE_DESCRIPTION("Lustre Lock Management Module v0.1");
 430 MODULE_LICENSE("GPL");
 431
 432 module_init(ldlm_init);
 433 module_exit(ldlm_exit);