1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
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
29 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/genops.c
38 * These are the only exported functions, they provide some generic
39 * infrastructure for managing object devices
42 #define DEBUG_SUBSYSTEM S_CLASS
44 #include <liblustre.h>
47 #include <obd_class.h>
48 #include <lprocfs_status.h>
50 extern cfs_list_t obd_types;
51 cfs_spinlock_t obd_types_lock;
53 cfs_mem_cache_t *obd_device_cachep;
54 cfs_mem_cache_t *obdo_cachep;
55 EXPORT_SYMBOL(obdo_cachep);
56 cfs_mem_cache_t *import_cachep;
58 cfs_list_t obd_zombie_imports;
59 cfs_list_t obd_zombie_exports;
60 cfs_spinlock_t obd_zombie_impexp_lock;
61 static void obd_zombie_impexp_notify(void);
62 static void obd_zombie_export_add(struct obd_export *exp);
63 static void obd_zombie_import_add(struct obd_import *imp);
64 static void print_export_data(struct obd_export *exp,
65 const char *status, int locks);
67 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
70 * support functions: we could use inter-module communication, but this
71 * is more portable to other OS's
73 static struct obd_device *obd_device_alloc(void)
75 struct obd_device *obd;
77 OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, CFS_ALLOC_IO);
79 obd->obd_magic = OBD_DEVICE_MAGIC;
83 EXPORT_SYMBOL(obd_device_alloc);
85 static void obd_device_free(struct obd_device *obd)
88 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
89 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
90 if (obd->obd_namespace != NULL) {
91 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
92 obd, obd->obd_namespace, obd->obd_force);
95 lu_ref_fini(&obd->obd_reference);
96 OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
99 struct obd_type *class_search_type(const char *name)
102 struct obd_type *type;
104 cfs_spin_lock(&obd_types_lock);
105 cfs_list_for_each(tmp, &obd_types) {
106 type = cfs_list_entry(tmp, struct obd_type, typ_chain);
107 if (strcmp(type->typ_name, name) == 0) {
108 cfs_spin_unlock(&obd_types_lock);
112 cfs_spin_unlock(&obd_types_lock);
116 struct obd_type *class_get_type(const char *name)
118 struct obd_type *type = class_search_type(name);
120 #ifdef HAVE_MODULE_LOADING_SUPPORT
122 const char *modname = name;
123 if (!cfs_request_module("%s", modname)) {
124 CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
125 type = class_search_type(name);
127 LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
133 cfs_spin_lock(&type->obd_type_lock);
135 cfs_try_module_get(type->typ_dt_ops->o_owner);
136 cfs_spin_unlock(&type->obd_type_lock);
141 void class_put_type(struct obd_type *type)
144 cfs_spin_lock(&type->obd_type_lock);
146 cfs_module_put(type->typ_dt_ops->o_owner);
147 cfs_spin_unlock(&type->obd_type_lock);
150 #define CLASS_MAX_NAME 1024
152 int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
153 struct lprocfs_vars *vars, const char *name,
154 struct lu_device_type *ldt)
156 struct obd_type *type;
161 LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
163 if (class_search_type(name)) {
164 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
169 OBD_ALLOC(type, sizeof(*type));
173 OBD_ALLOC_PTR(type->typ_dt_ops);
174 OBD_ALLOC_PTR(type->typ_md_ops);
175 OBD_ALLOC(type->typ_name, strlen(name) + 1);
177 if (type->typ_dt_ops == NULL ||
178 type->typ_md_ops == NULL ||
179 type->typ_name == NULL)
182 *(type->typ_dt_ops) = *dt_ops;
183 /* md_ops is optional */
185 *(type->typ_md_ops) = *md_ops;
186 strcpy(type->typ_name, name);
187 cfs_spin_lock_init(&type->obd_type_lock);
190 type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root,
192 if (IS_ERR(type->typ_procroot)) {
193 rc = PTR_ERR(type->typ_procroot);
194 type->typ_procroot = NULL;
200 rc = lu_device_type_init(ldt);
205 cfs_spin_lock(&obd_types_lock);
206 cfs_list_add(&type->typ_chain, &obd_types);
207 cfs_spin_unlock(&obd_types_lock);
212 if (type->typ_name != NULL)
213 OBD_FREE(type->typ_name, strlen(name) + 1);
214 if (type->typ_md_ops != NULL)
215 OBD_FREE_PTR(type->typ_md_ops);
216 if (type->typ_dt_ops != NULL)
217 OBD_FREE_PTR(type->typ_dt_ops);
218 OBD_FREE(type, sizeof(*type));
222 int class_unregister_type(const char *name)
224 struct obd_type *type = class_search_type(name);
228 CERROR("unknown obd type\n");
232 if (type->typ_refcnt) {
233 CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt);
234 /* This is a bad situation, let's make the best of it */
235 /* Remove ops, but leave the name for debugging */
236 OBD_FREE_PTR(type->typ_dt_ops);
237 OBD_FREE_PTR(type->typ_md_ops);
241 if (type->typ_procroot) {
242 lprocfs_remove(&type->typ_procroot);
246 lu_device_type_fini(type->typ_lu);
248 cfs_spin_lock(&obd_types_lock);
249 cfs_list_del(&type->typ_chain);
250 cfs_spin_unlock(&obd_types_lock);
251 OBD_FREE(type->typ_name, strlen(name) + 1);
252 if (type->typ_dt_ops != NULL)
253 OBD_FREE_PTR(type->typ_dt_ops);
254 if (type->typ_md_ops != NULL)
255 OBD_FREE_PTR(type->typ_md_ops);
256 OBD_FREE(type, sizeof(*type));
258 } /* class_unregister_type */
261 * Create a new obd device.
263 * Find an empty slot in ::obd_devs[], create a new obd device in it.
265 * \param[in] type_name obd device type string.
266 * \param[in] name obd device name.
268 * \retval NULL if create fails, otherwise return the obd device
271 struct obd_device *class_newdev(const char *type_name, const char *name)
273 struct obd_device *result = NULL;
274 struct obd_device *newdev;
275 struct obd_type *type = NULL;
277 int new_obd_minor = 0;
279 if (strlen(name) >= MAX_OBD_NAME) {
280 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
281 RETURN(ERR_PTR(-EINVAL));
284 type = class_get_type(type_name);
286 CERROR("OBD: unknown type: %s\n", type_name);
287 RETURN(ERR_PTR(-ENODEV));
290 newdev = obd_device_alloc();
291 if (newdev == NULL) {
292 class_put_type(type);
293 RETURN(ERR_PTR(-ENOMEM));
295 LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
297 cfs_spin_lock(&obd_dev_lock);
298 for (i = 0; i < class_devno_max(); i++) {
299 struct obd_device *obd = class_num2obd(i);
300 if (obd && obd->obd_name &&
301 (strcmp(name, obd->obd_name) == 0)) {
302 CERROR("Device %s already exists, won't add\n", name);
304 LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
305 "%p obd_magic %08x != %08x\n", result,
306 result->obd_magic, OBD_DEVICE_MAGIC);
307 LASSERTF(result->obd_minor == new_obd_minor,
308 "%p obd_minor %d != %d\n", result,
309 result->obd_minor, new_obd_minor);
311 obd_devs[result->obd_minor] = NULL;
312 result->obd_name[0]='\0';
314 result = ERR_PTR(-EEXIST);
317 if (!result && !obd) {
319 result->obd_minor = i;
321 result->obd_type = type;
322 strncpy(result->obd_name, name,
323 sizeof(result->obd_name) - 1);
324 obd_devs[i] = result;
327 cfs_spin_unlock(&obd_dev_lock);
329 if (result == NULL && i >= class_devno_max()) {
330 CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n",
332 result = ERR_PTR(-EOVERFLOW);
335 if (IS_ERR(result)) {
336 obd_device_free(newdev);
337 class_put_type(type);
339 CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
340 result->obd_name, result);
345 void class_release_dev(struct obd_device *obd)
347 struct obd_type *obd_type = obd->obd_type;
349 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n",
350 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
351 LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
352 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
353 LASSERT(obd_type != NULL);
355 CDEBUG(D_INFO, "Release obd device %s obd_type name =%s\n",
356 obd->obd_name,obd->obd_type->typ_name);
358 cfs_spin_lock(&obd_dev_lock);
359 obd_devs[obd->obd_minor] = NULL;
360 cfs_spin_unlock(&obd_dev_lock);
361 obd_device_free(obd);
363 class_put_type(obd_type);
366 int class_name2dev(const char *name)
373 cfs_spin_lock(&obd_dev_lock);
374 for (i = 0; i < class_devno_max(); i++) {
375 struct obd_device *obd = class_num2obd(i);
376 if (obd && obd->obd_name && strcmp(name, obd->obd_name) == 0) {
377 /* Make sure we finished attaching before we give
378 out any references */
379 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
380 if (obd->obd_attached) {
381 cfs_spin_unlock(&obd_dev_lock);
387 cfs_spin_unlock(&obd_dev_lock);
392 struct obd_device *class_name2obd(const char *name)
394 int dev = class_name2dev(name);
396 if (dev < 0 || dev > class_devno_max())
398 return class_num2obd(dev);
401 int class_uuid2dev(struct obd_uuid *uuid)
405 cfs_spin_lock(&obd_dev_lock);
406 for (i = 0; i < class_devno_max(); i++) {
407 struct obd_device *obd = class_num2obd(i);
408 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
409 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
410 cfs_spin_unlock(&obd_dev_lock);
414 cfs_spin_unlock(&obd_dev_lock);
419 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
421 int dev = class_uuid2dev(uuid);
424 return class_num2obd(dev);
428 * Get obd device from ::obd_devs[]
430 * \param num [in] array index
432 * \retval NULL if ::obd_devs[\a num] does not contains an obd device
433 * otherwise return the obd device there.
435 struct obd_device *class_num2obd(int num)
437 struct obd_device *obd = NULL;
439 if (num < class_devno_max()) {
444 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
445 "%p obd_magic %08x != %08x\n",
446 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
447 LASSERTF(obd->obd_minor == num,
448 "%p obd_minor %0d != %0d\n",
449 obd, obd->obd_minor, num);
455 void class_obd_list(void)
460 cfs_spin_lock(&obd_dev_lock);
461 for (i = 0; i < class_devno_max(); i++) {
462 struct obd_device *obd = class_num2obd(i);
465 if (obd->obd_stopping)
467 else if (obd->obd_set_up)
469 else if (obd->obd_attached)
473 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
474 i, status, obd->obd_type->typ_name,
475 obd->obd_name, obd->obd_uuid.uuid,
476 cfs_atomic_read(&obd->obd_refcount));
478 cfs_spin_unlock(&obd_dev_lock);
482 /* Search for a client OBD connected to tgt_uuid. If grp_uuid is
483 specified, then only the client with that uuid is returned,
484 otherwise any client connected to the tgt is returned. */
485 struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid,
486 const char * typ_name,
487 struct obd_uuid *grp_uuid)
491 cfs_spin_lock(&obd_dev_lock);
492 for (i = 0; i < class_devno_max(); i++) {
493 struct obd_device *obd = class_num2obd(i);
496 if ((strncmp(obd->obd_type->typ_name, typ_name,
497 strlen(typ_name)) == 0)) {
498 if (obd_uuid_equals(tgt_uuid,
499 &obd->u.cli.cl_target_uuid) &&
500 ((grp_uuid)? obd_uuid_equals(grp_uuid,
501 &obd->obd_uuid) : 1)) {
502 cfs_spin_unlock(&obd_dev_lock);
507 cfs_spin_unlock(&obd_dev_lock);
512 /* Iterate the obd_device list looking devices have grp_uuid. Start
513 searching at *next, and if a device is found, the next index to look
514 at is saved in *next. If next is NULL, then the first matching device
515 will always be returned. */
516 struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
522 else if (*next >= 0 && *next < class_devno_max())
527 cfs_spin_lock(&obd_dev_lock);
528 for (; i < class_devno_max(); i++) {
529 struct obd_device *obd = class_num2obd(i);
532 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
535 cfs_spin_unlock(&obd_dev_lock);
539 cfs_spin_unlock(&obd_dev_lock);
545 * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
546 * adjust sptlrpc settings accordingly.
548 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
550 struct obd_device *obd;
554 LASSERT(namelen > 0);
556 cfs_spin_lock(&obd_dev_lock);
557 for (i = 0; i < class_devno_max(); i++) {
558 obd = class_num2obd(i);
560 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
563 /* only notify mdc, osc, mdt, ost */
564 type = obd->obd_type->typ_name;
565 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
566 strcmp(type, LUSTRE_OSC_NAME) != 0 &&
567 strcmp(type, LUSTRE_MDT_NAME) != 0 &&
568 strcmp(type, LUSTRE_OST_NAME) != 0)
571 if (strncmp(obd->obd_name, fsname, namelen))
574 class_incref(obd, __FUNCTION__, obd);
575 cfs_spin_unlock(&obd_dev_lock);
576 rc2 = obd_set_info_async(obd->obd_self_export,
577 sizeof(KEY_SPTLRPC_CONF),
578 KEY_SPTLRPC_CONF, 0, NULL, NULL);
580 class_decref(obd, __FUNCTION__, obd);
581 cfs_spin_lock(&obd_dev_lock);
583 cfs_spin_unlock(&obd_dev_lock);
586 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
588 void obd_cleanup_caches(void)
593 if (obd_device_cachep) {
594 rc = cfs_mem_cache_destroy(obd_device_cachep);
595 LASSERTF(rc == 0, "Cannot destropy ll_obd_device_cache: rc %d\n", rc);
596 obd_device_cachep = NULL;
599 rc = cfs_mem_cache_destroy(obdo_cachep);
600 LASSERTF(rc == 0, "Cannot destory ll_obdo_cache\n");
604 rc = cfs_mem_cache_destroy(import_cachep);
605 LASSERTF(rc == 0, "Cannot destory ll_import_cache\n");
606 import_cachep = NULL;
609 rc = cfs_mem_cache_destroy(capa_cachep);
610 LASSERTF(rc == 0, "Cannot destory capa_cache\n");
616 int obd_init_caches(void)
620 LASSERT(obd_device_cachep == NULL);
621 obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache",
622 sizeof(struct obd_device),
624 if (!obd_device_cachep)
627 LASSERT(obdo_cachep == NULL);
628 obdo_cachep = cfs_mem_cache_create("ll_obdo_cache", sizeof(struct obdo),
633 LASSERT(import_cachep == NULL);
634 import_cachep = cfs_mem_cache_create("ll_import_cache",
635 sizeof(struct obd_import),
640 LASSERT(capa_cachep == NULL);
641 capa_cachep = cfs_mem_cache_create("capa_cache",
642 sizeof(struct obd_capa), 0, 0);
648 obd_cleanup_caches();
653 /* map connection to client */
654 struct obd_export *class_conn2export(struct lustre_handle *conn)
656 struct obd_export *export;
660 CDEBUG(D_CACHE, "looking for null handle\n");
664 if (conn->cookie == -1) { /* this means assign a new connection */
665 CDEBUG(D_CACHE, "want a new connection\n");
669 CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie);
670 export = class_handle2object(conn->cookie);
674 struct obd_device *class_exp2obd(struct obd_export *exp)
681 struct obd_device *class_conn2obd(struct lustre_handle *conn)
683 struct obd_export *export;
684 export = class_conn2export(conn);
686 struct obd_device *obd = export->exp_obd;
687 class_export_put(export);
693 struct obd_import *class_exp2cliimp(struct obd_export *exp)
695 struct obd_device *obd = exp->exp_obd;
698 return obd->u.cli.cl_import;
701 struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
703 struct obd_device *obd = class_conn2obd(conn);
706 return obd->u.cli.cl_import;
709 /* Export management functions */
710 static void class_export_destroy(struct obd_export *exp)
712 struct obd_device *obd = exp->exp_obd;
715 LASSERT (cfs_atomic_read(&exp->exp_refcount) == 0);
717 CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
718 exp->exp_client_uuid.uuid, obd->obd_name);
720 LASSERT(obd != NULL);
722 /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
723 if (exp->exp_connection)
724 ptlrpc_put_connection_superhack(exp->exp_connection);
726 LASSERT(cfs_list_empty(&exp->exp_outstanding_replies));
727 LASSERT(cfs_list_empty(&exp->exp_uncommitted_replies));
728 LASSERT(cfs_list_empty(&exp->exp_req_replay_queue));
729 LASSERT(cfs_list_empty(&exp->exp_queued_rpc));
730 obd_destroy_export(exp);
731 class_decref(obd, "export", exp);
733 OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
737 static void export_handle_addref(void *export)
739 class_export_get(export);
742 struct obd_export *class_export_get(struct obd_export *exp)
744 cfs_atomic_inc(&exp->exp_refcount);
745 CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
746 cfs_atomic_read(&exp->exp_refcount));
749 EXPORT_SYMBOL(class_export_get);
751 void class_export_put(struct obd_export *exp)
753 LASSERT(exp != NULL);
754 CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
755 cfs_atomic_read(&exp->exp_refcount) - 1);
756 LASSERT(cfs_atomic_read(&exp->exp_refcount) > 0);
757 LASSERT(cfs_atomic_read(&exp->exp_refcount) < 0x5a5a5a);
759 if (cfs_atomic_dec_and_test(&exp->exp_refcount)) {
760 LASSERT(!cfs_list_empty(&exp->exp_obd_chain));
761 CDEBUG(D_IOCTL, "final put %p/%s\n",
762 exp, exp->exp_client_uuid.uuid);
763 obd_zombie_export_add(exp);
766 EXPORT_SYMBOL(class_export_put);
768 /* Creates a new export, adds it to the hash table, and returns a
769 * pointer to it. The refcount is 2: one for the hash reference, and
770 * one for the pointer returned by this function. */
771 struct obd_export *class_new_export(struct obd_device *obd,
772 struct obd_uuid *cluuid)
774 struct obd_export *export;
779 OBD_ALLOC_PTR(export);
781 return ERR_PTR(-ENOMEM);
783 export->exp_conn_cnt = 0;
784 export->exp_lock_hash = NULL;
785 cfs_atomic_set(&export->exp_refcount, 2);
786 cfs_atomic_set(&export->exp_rpc_count, 0);
787 cfs_atomic_set(&export->exp_cb_count, 0);
788 cfs_atomic_set(&export->exp_locks_count, 0);
789 #if LUSTRE_TRACKS_LOCK_EXP_REFS
790 CFS_INIT_LIST_HEAD(&export->exp_locks_list);
791 cfs_spin_lock_init(&export->exp_locks_list_guard);
793 cfs_atomic_set(&export->exp_replay_count, 0);
794 export->exp_obd = obd;
795 CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies);
796 cfs_spin_lock_init(&export->exp_uncommitted_replies_lock);
797 CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies);
798 CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue);
799 CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
800 CFS_INIT_LIST_HEAD(&export->exp_queued_rpc);
801 class_handle_hash(&export->exp_handle, export_handle_addref);
802 export->exp_last_request_time = cfs_time_current_sec();
803 cfs_spin_lock_init(&export->exp_lock);
804 CFS_INIT_HLIST_NODE(&export->exp_uuid_hash);
805 CFS_INIT_HLIST_NODE(&export->exp_nid_hash);
807 export->exp_sp_peer = LUSTRE_SP_ANY;
808 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
809 export->exp_client_uuid = *cluuid;
810 obd_init_export(export);
812 cfs_spin_lock(&obd->obd_dev_lock);
813 /* shouldn't happen, but might race */
814 if (obd->obd_stopping)
815 GOTO(exit_unlock, rc = -ENODEV);
817 hash = cfs_hash_getref(obd->obd_uuid_hash);
819 GOTO(exit_unlock, rc = -ENODEV);
820 cfs_spin_unlock(&obd->obd_dev_lock);
822 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
823 rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash);
825 LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
826 obd->obd_name, cluuid->uuid, rc);
827 GOTO(exit_err, rc = -EALREADY);
831 cfs_hash_putref(hash);
833 cfs_spin_lock(&obd->obd_dev_lock);
834 if (obd->obd_stopping)
835 GOTO(exit_unlock, rc = -ENODEV);
837 class_incref(obd, "export", export);
838 cfs_list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
839 cfs_list_add_tail(&export->exp_obd_chain_timed,
840 &export->exp_obd->obd_exports_timed);
841 export->exp_obd->obd_num_exports++;
842 cfs_spin_unlock(&obd->obd_dev_lock);
846 cfs_spin_unlock(&obd->obd_dev_lock);
848 class_handle_unhash(&export->exp_handle);
849 LASSERT(cfs_hlist_unhashed(&export->exp_uuid_hash));
850 obd_destroy_export(export);
851 OBD_FREE_PTR(export);
854 EXPORT_SYMBOL(class_new_export);
856 void class_unlink_export(struct obd_export *exp)
858 class_handle_unhash(&exp->exp_handle);
860 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
861 /* delete an uuid-export hashitem from hashtables */
862 if (!cfs_hlist_unhashed(&exp->exp_uuid_hash))
863 cfs_hash_del(exp->exp_obd->obd_uuid_hash,
864 &exp->exp_client_uuid,
865 &exp->exp_uuid_hash);
867 cfs_list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
868 cfs_list_del_init(&exp->exp_obd_chain_timed);
869 exp->exp_obd->obd_num_exports--;
870 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
871 class_export_put(exp);
873 EXPORT_SYMBOL(class_unlink_export);
875 /* Import management functions */
876 void class_import_destroy(struct obd_import *imp)
880 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
881 imp->imp_obd->obd_name);
883 LASSERT(cfs_atomic_read(&imp->imp_refcount) == 0);
885 ptlrpc_put_connection_superhack(imp->imp_connection);
887 while (!cfs_list_empty(&imp->imp_conn_list)) {
888 struct obd_import_conn *imp_conn;
890 imp_conn = cfs_list_entry(imp->imp_conn_list.next,
891 struct obd_import_conn, oic_item);
892 cfs_list_del_init(&imp_conn->oic_item);
893 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
894 OBD_FREE(imp_conn, sizeof(*imp_conn));
897 LASSERT(imp->imp_sec == NULL);
898 class_decref(imp->imp_obd, "import", imp);
899 OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
903 static void import_handle_addref(void *import)
905 class_import_get(import);
908 struct obd_import *class_import_get(struct obd_import *import)
910 LASSERT(cfs_atomic_read(&import->imp_refcount) >= 0);
911 LASSERT(cfs_atomic_read(&import->imp_refcount) < 0x5a5a5a);
912 cfs_atomic_inc(&import->imp_refcount);
913 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
914 cfs_atomic_read(&import->imp_refcount),
915 import->imp_obd->obd_name);
918 EXPORT_SYMBOL(class_import_get);
920 void class_import_put(struct obd_import *imp)
924 LASSERT(cfs_atomic_read(&imp->imp_refcount) > 0);
925 LASSERT(cfs_atomic_read(&imp->imp_refcount) < 0x5a5a5a);
926 LASSERT(cfs_list_empty(&imp->imp_zombie_chain));
928 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
929 cfs_atomic_read(&imp->imp_refcount) - 1,
930 imp->imp_obd->obd_name);
932 if (cfs_atomic_dec_and_test(&imp->imp_refcount)) {
933 CDEBUG(D_INFO, "final put import %p\n", imp);
934 obd_zombie_import_add(imp);
939 EXPORT_SYMBOL(class_import_put);
941 static void init_imp_at(struct imp_at *at) {
943 at_init(&at->iat_net_latency, 0, 0);
944 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
945 /* max service estimates are tracked on the server side, so
946 don't use the AT history here, just use the last reported
947 val. (But keep hist for proc histogram, worst_ever) */
948 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
953 struct obd_import *class_new_import(struct obd_device *obd)
955 struct obd_import *imp;
957 OBD_ALLOC(imp, sizeof(*imp));
961 CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain);
962 CFS_INIT_LIST_HEAD(&imp->imp_replay_list);
963 CFS_INIT_LIST_HEAD(&imp->imp_sending_list);
964 CFS_INIT_LIST_HEAD(&imp->imp_delayed_list);
965 cfs_spin_lock_init(&imp->imp_lock);
966 imp->imp_last_success_conn = 0;
967 imp->imp_state = LUSTRE_IMP_NEW;
968 imp->imp_obd = class_incref(obd, "import", imp);
969 cfs_sema_init(&imp->imp_sec_mutex, 1);
970 cfs_waitq_init(&imp->imp_recovery_waitq);
972 cfs_atomic_set(&imp->imp_refcount, 2);
973 cfs_atomic_set(&imp->imp_unregistering, 0);
974 cfs_atomic_set(&imp->imp_inflight, 0);
975 cfs_atomic_set(&imp->imp_replay_inflight, 0);
976 cfs_atomic_set(&imp->imp_inval_count, 0);
977 CFS_INIT_LIST_HEAD(&imp->imp_conn_list);
978 CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link);
979 class_handle_hash(&imp->imp_handle, import_handle_addref);
980 init_imp_at(&imp->imp_at);
982 /* the default magic is V2, will be used in connect RPC, and
983 * then adjusted according to the flags in request/reply. */
984 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
988 EXPORT_SYMBOL(class_new_import);
990 void class_destroy_import(struct obd_import *import)
992 LASSERT(import != NULL);
993 LASSERT(import != LP_POISON);
995 class_handle_unhash(&import->imp_handle);
997 cfs_spin_lock(&import->imp_lock);
998 import->imp_generation++;
999 cfs_spin_unlock(&import->imp_lock);
1000 class_import_put(import);
1002 EXPORT_SYMBOL(class_destroy_import);
1004 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1006 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1008 cfs_spin_lock(&exp->exp_locks_list_guard);
1010 LASSERT(lock->l_exp_refs_nr >= 0);
1012 if (lock->l_exp_refs_target != NULL &&
1013 lock->l_exp_refs_target != exp) {
1014 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1015 exp, lock, lock->l_exp_refs_target);
1017 if ((lock->l_exp_refs_nr ++) == 0) {
1018 cfs_list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1019 lock->l_exp_refs_target = exp;
1021 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1022 lock, exp, lock->l_exp_refs_nr);
1023 cfs_spin_unlock(&exp->exp_locks_list_guard);
1025 EXPORT_SYMBOL(__class_export_add_lock_ref);
1027 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1029 cfs_spin_lock(&exp->exp_locks_list_guard);
1030 LASSERT(lock->l_exp_refs_nr > 0);
1031 if (lock->l_exp_refs_target != exp) {
1032 LCONSOLE_WARN("lock %p, "
1033 "mismatching export pointers: %p, %p\n",
1034 lock, lock->l_exp_refs_target, exp);
1036 if (-- lock->l_exp_refs_nr == 0) {
1037 cfs_list_del_init(&lock->l_exp_refs_link);
1038 lock->l_exp_refs_target = NULL;
1040 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1041 lock, exp, lock->l_exp_refs_nr);
1042 cfs_spin_unlock(&exp->exp_locks_list_guard);
1044 EXPORT_SYMBOL(__class_export_del_lock_ref);
1047 /* A connection defines an export context in which preallocation can
1048 be managed. This releases the export pointer reference, and returns
1049 the export handle, so the export refcount is 1 when this function
1051 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1052 struct obd_uuid *cluuid)
1054 struct obd_export *export;
1055 LASSERT(conn != NULL);
1056 LASSERT(obd != NULL);
1057 LASSERT(cluuid != NULL);
1060 export = class_new_export(obd, cluuid);
1062 RETURN(PTR_ERR(export));
1064 conn->cookie = export->exp_handle.h_cookie;
1065 class_export_put(export);
1067 CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1068 cluuid->uuid, conn->cookie);
1071 EXPORT_SYMBOL(class_connect);
1073 /* if export is involved in recovery then clean up related things */
1074 void class_export_recovery_cleanup(struct obd_export *exp)
1076 struct obd_device *obd = exp->exp_obd;
1078 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1079 if (exp->exp_delayed)
1080 obd->obd_delayed_clients--;
1081 if (obd->obd_recovering && exp->exp_in_recovery) {
1082 cfs_spin_lock(&exp->exp_lock);
1083 exp->exp_in_recovery = 0;
1084 cfs_spin_unlock(&exp->exp_lock);
1085 LASSERT(obd->obd_connected_clients);
1086 obd->obd_connected_clients--;
1088 /** Cleanup req replay fields */
1089 if (exp->exp_req_replay_needed) {
1090 cfs_spin_lock(&exp->exp_lock);
1091 exp->exp_req_replay_needed = 0;
1092 cfs_spin_unlock(&exp->exp_lock);
1093 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients));
1094 cfs_atomic_dec(&obd->obd_req_replay_clients);
1096 /** Cleanup lock replay data */
1097 if (exp->exp_lock_replay_needed) {
1098 cfs_spin_lock(&exp->exp_lock);
1099 exp->exp_lock_replay_needed = 0;
1100 cfs_spin_unlock(&exp->exp_lock);
1101 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients));
1102 cfs_atomic_dec(&obd->obd_lock_replay_clients);
1104 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1107 /* This function removes 1-3 references from the export:
1108 * 1 - for export pointer passed
1109 * and if disconnect really need
1110 * 2 - removing from hash
1111 * 3 - in client_unlink_export
1112 * The export pointer passed to this function can destroyed */
1113 int class_disconnect(struct obd_export *export)
1115 int already_disconnected;
1118 if (export == NULL) {
1120 CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export);
1124 cfs_spin_lock(&export->exp_lock);
1125 already_disconnected = export->exp_disconnected;
1126 export->exp_disconnected = 1;
1127 cfs_spin_unlock(&export->exp_lock);
1129 /* class_cleanup(), abort_recovery(), and class_fail_export()
1130 * all end up in here, and if any of them race we shouldn't
1131 * call extra class_export_puts(). */
1132 if (already_disconnected) {
1133 LASSERT(cfs_hlist_unhashed(&export->exp_nid_hash));
1134 GOTO(no_disconn, already_disconnected);
1137 CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1138 export->exp_handle.h_cookie);
1140 if (!cfs_hlist_unhashed(&export->exp_nid_hash))
1141 cfs_hash_del(export->exp_obd->obd_nid_hash,
1142 &export->exp_connection->c_peer.nid,
1143 &export->exp_nid_hash);
1145 class_export_recovery_cleanup(export);
1146 class_unlink_export(export);
1148 class_export_put(export);
1152 /* Return non-zero for a fully connected export */
1153 int class_connected_export(struct obd_export *exp)
1157 cfs_spin_lock(&exp->exp_lock);
1158 connected = (exp->exp_conn_cnt > 0);
1159 cfs_spin_unlock(&exp->exp_lock);
1164 EXPORT_SYMBOL(class_connected_export);
1166 static void class_disconnect_export_list(cfs_list_t *list,
1167 enum obd_option flags)
1170 struct obd_export *exp;
1173 /* It's possible that an export may disconnect itself, but
1174 * nothing else will be added to this list. */
1175 while (!cfs_list_empty(list)) {
1176 exp = cfs_list_entry(list->next, struct obd_export,
1178 /* need for safe call CDEBUG after obd_disconnect */
1179 class_export_get(exp);
1181 cfs_spin_lock(&exp->exp_lock);
1182 exp->exp_flags = flags;
1183 cfs_spin_unlock(&exp->exp_lock);
1185 if (obd_uuid_equals(&exp->exp_client_uuid,
1186 &exp->exp_obd->obd_uuid)) {
1188 "exp %p export uuid == obd uuid, don't discon\n",
1190 /* Need to delete this now so we don't end up pointing
1191 * to work_list later when this export is cleaned up. */
1192 cfs_list_del_init(&exp->exp_obd_chain);
1193 class_export_put(exp);
1197 class_export_get(exp);
1198 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1199 "last request at "CFS_TIME_T"\n",
1200 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1201 exp, exp->exp_last_request_time);
1202 /* release one export reference anyway */
1203 rc = obd_disconnect(exp);
1205 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1206 obd_export_nid2str(exp), exp, rc);
1207 class_export_put(exp);
1212 void class_disconnect_exports(struct obd_device *obd)
1214 cfs_list_t work_list;
1217 /* Move all of the exports from obd_exports to a work list, en masse. */
1218 CFS_INIT_LIST_HEAD(&work_list);
1219 cfs_spin_lock(&obd->obd_dev_lock);
1220 cfs_list_splice_init(&obd->obd_exports, &work_list);
1221 cfs_list_splice_init(&obd->obd_delayed_exports, &work_list);
1222 cfs_spin_unlock(&obd->obd_dev_lock);
1224 if (!cfs_list_empty(&work_list)) {
1225 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1226 "disconnecting them\n", obd->obd_minor, obd);
1227 class_disconnect_export_list(&work_list,
1228 exp_flags_from_obd(obd));
1230 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1231 obd->obd_minor, obd);
1234 EXPORT_SYMBOL(class_disconnect_exports);
1236 /* Remove exports that have not completed recovery.
1238 void class_disconnect_stale_exports(struct obd_device *obd,
1239 int (*test_export)(struct obd_export *))
1241 cfs_list_t work_list;
1242 cfs_list_t *pos, *n;
1243 struct obd_export *exp;
1247 CFS_INIT_LIST_HEAD(&work_list);
1248 cfs_spin_lock(&obd->obd_dev_lock);
1249 cfs_list_for_each_safe(pos, n, &obd->obd_exports) {
1250 exp = cfs_list_entry(pos, struct obd_export, exp_obd_chain);
1251 if (test_export(exp))
1254 /* don't count self-export as client */
1255 if (obd_uuid_equals(&exp->exp_client_uuid,
1256 &exp->exp_obd->obd_uuid))
1259 cfs_list_move(&exp->exp_obd_chain, &work_list);
1261 CDEBUG(D_ERROR, "%s: disconnect stale client %s@%s\n",
1262 obd->obd_name, exp->exp_client_uuid.uuid,
1263 exp->exp_connection == NULL ? "<unknown>" :
1264 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1265 print_export_data(exp, "EVICTING", 0);
1267 cfs_spin_unlock(&obd->obd_dev_lock);
1270 CDEBUG(D_HA, "%s: disconnecting %d stale clients\n",
1271 obd->obd_name, evicted);
1272 obd->obd_stale_clients += evicted;
1274 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1275 OBD_OPT_ABORT_RECOV);
1278 EXPORT_SYMBOL(class_disconnect_stale_exports);
1280 void class_fail_export(struct obd_export *exp)
1282 int rc, already_failed;
1284 cfs_spin_lock(&exp->exp_lock);
1285 already_failed = exp->exp_failed;
1286 exp->exp_failed = 1;
1287 cfs_spin_unlock(&exp->exp_lock);
1289 if (already_failed) {
1290 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1291 exp, exp->exp_client_uuid.uuid);
1295 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1296 exp, exp->exp_client_uuid.uuid);
1298 if (obd_dump_on_timeout)
1299 libcfs_debug_dumplog();
1301 /* Most callers into obd_disconnect are removing their own reference
1302 * (request, for example) in addition to the one from the hash table.
1303 * We don't have such a reference here, so make one. */
1304 class_export_get(exp);
1305 rc = obd_disconnect(exp);
1307 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1309 CDEBUG(D_HA, "disconnected export %p/%s\n",
1310 exp, exp->exp_client_uuid.uuid);
1312 EXPORT_SYMBOL(class_fail_export);
1314 char *obd_export_nid2str(struct obd_export *exp)
1316 if (exp->exp_connection != NULL)
1317 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1321 EXPORT_SYMBOL(obd_export_nid2str);
1323 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1325 struct obd_export *doomed_exp = NULL;
1326 int exports_evicted = 0;
1328 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1331 doomed_exp = cfs_hash_lookup(obd->obd_nid_hash, &nid_key);
1332 if (doomed_exp == NULL)
1335 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1336 "nid %s found, wanted nid %s, requested nid %s\n",
1337 obd_export_nid2str(doomed_exp),
1338 libcfs_nid2str(nid_key), nid);
1339 LASSERTF(doomed_exp != obd->obd_self_export,
1340 "self-export is hashed by NID?\n");
1342 CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n",
1343 obd->obd_name, nid, doomed_exp->exp_client_uuid.uuid,
1345 class_fail_export(doomed_exp);
1346 class_export_put(doomed_exp);
1349 if (!exports_evicted)
1350 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1351 obd->obd_name, nid);
1352 return exports_evicted;
1354 EXPORT_SYMBOL(obd_export_evict_by_nid);
1356 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1358 struct obd_export *doomed_exp = NULL;
1359 struct obd_uuid doomed_uuid;
1360 int exports_evicted = 0;
1362 obd_str2uuid(&doomed_uuid, uuid);
1363 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1364 CERROR("%s: can't evict myself\n", obd->obd_name);
1365 return exports_evicted;
1368 doomed_exp = cfs_hash_lookup(obd->obd_uuid_hash, &doomed_uuid);
1370 if (doomed_exp == NULL) {
1371 CERROR("%s: can't disconnect %s: no exports found\n",
1372 obd->obd_name, uuid);
1374 CWARN("%s: evicting %s at adminstrative request\n",
1375 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1376 class_fail_export(doomed_exp);
1377 class_export_put(doomed_exp);
1381 return exports_evicted;
1383 EXPORT_SYMBOL(obd_export_evict_by_uuid);
1385 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1386 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1387 EXPORT_SYMBOL(class_export_dump_hook);
1390 static void print_export_data(struct obd_export *exp, const char *status,
1393 struct ptlrpc_reply_state *rs;
1394 struct ptlrpc_reply_state *first_reply = NULL;
1397 cfs_spin_lock(&exp->exp_lock);
1398 cfs_list_for_each_entry(rs, &exp->exp_outstanding_replies,
1404 cfs_spin_unlock(&exp->exp_lock);
1406 CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1407 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1408 obd_export_nid2str(exp), cfs_atomic_read(&exp->exp_refcount),
1409 cfs_atomic_read(&exp->exp_rpc_count),
1410 cfs_atomic_read(&exp->exp_cb_count),
1411 cfs_atomic_read(&exp->exp_locks_count),
1412 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1413 nreplies, first_reply, nreplies > 3 ? "..." : "",
1414 exp->exp_last_committed);
1415 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1416 if (locks && class_export_dump_hook != NULL)
1417 class_export_dump_hook(exp);
1421 void dump_exports(struct obd_device *obd, int locks)
1423 struct obd_export *exp;
1425 cfs_spin_lock(&obd->obd_dev_lock);
1426 cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1427 print_export_data(exp, "ACTIVE", locks);
1428 cfs_list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1429 print_export_data(exp, "UNLINKED", locks);
1430 cfs_list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1431 print_export_data(exp, "DELAYED", locks);
1432 cfs_spin_unlock(&obd->obd_dev_lock);
1433 cfs_spin_lock(&obd_zombie_impexp_lock);
1434 cfs_list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1435 print_export_data(exp, "ZOMBIE", locks);
1436 cfs_spin_unlock(&obd_zombie_impexp_lock);
1438 EXPORT_SYMBOL(dump_exports);
1440 void obd_exports_barrier(struct obd_device *obd)
1443 LASSERT(cfs_list_empty(&obd->obd_exports));
1444 cfs_spin_lock(&obd->obd_dev_lock);
1445 while (!cfs_list_empty(&obd->obd_unlinked_exports)) {
1446 cfs_spin_unlock(&obd->obd_dev_lock);
1447 cfs_schedule_timeout_and_set_state(CFS_TASK_UNINT,
1448 cfs_time_seconds(waited));
1449 if (waited > 5 && IS_PO2(waited)) {
1450 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1451 "more than %d seconds. "
1452 "The obd refcount = %d. Is it stuck?\n",
1453 obd->obd_name, waited,
1454 cfs_atomic_read(&obd->obd_refcount));
1455 dump_exports(obd, 1);
1458 cfs_spin_lock(&obd->obd_dev_lock);
1460 cfs_spin_unlock(&obd->obd_dev_lock);
1462 EXPORT_SYMBOL(obd_exports_barrier);
1465 * kill zombie imports and exports
1467 void obd_zombie_impexp_cull(void)
1469 struct obd_import *import;
1470 struct obd_export *export;
1474 cfs_spin_lock(&obd_zombie_impexp_lock);
1477 if (!cfs_list_empty(&obd_zombie_imports)) {
1478 import = cfs_list_entry(obd_zombie_imports.next,
1481 cfs_list_del_init(&import->imp_zombie_chain);
1485 if (!cfs_list_empty(&obd_zombie_exports)) {
1486 export = cfs_list_entry(obd_zombie_exports.next,
1489 cfs_list_del_init(&export->exp_obd_chain);
1492 cfs_spin_unlock(&obd_zombie_impexp_lock);
1495 class_import_destroy(import);
1498 class_export_destroy(export);
1501 } while (import != NULL || export != NULL);
1505 static cfs_completion_t obd_zombie_start;
1506 static cfs_completion_t obd_zombie_stop;
1507 static unsigned long obd_zombie_flags;
1508 static cfs_waitq_t obd_zombie_waitq;
1509 static pid_t obd_zombie_pid;
1512 OBD_ZOMBIE_STOP = 1 << 1
1516 * check for work for kill zombie import/export thread.
1518 static int obd_zombie_impexp_check(void *arg)
1522 cfs_spin_lock(&obd_zombie_impexp_lock);
1523 rc = cfs_list_empty(&obd_zombie_imports) &&
1524 cfs_list_empty(&obd_zombie_exports) &&
1525 !cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1527 cfs_spin_unlock(&obd_zombie_impexp_lock);
1533 * Add export to the obd_zombe thread and notify it.
1535 static void obd_zombie_export_add(struct obd_export *exp) {
1536 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
1537 LASSERT(!cfs_list_empty(&exp->exp_obd_chain));
1538 cfs_list_del_init(&exp->exp_obd_chain);
1539 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
1540 cfs_spin_lock(&obd_zombie_impexp_lock);
1541 cfs_list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1542 cfs_spin_unlock(&obd_zombie_impexp_lock);
1544 if (obd_zombie_impexp_notify != NULL)
1545 obd_zombie_impexp_notify();
1549 * Add import to the obd_zombe thread and notify it.
1551 static void obd_zombie_import_add(struct obd_import *imp) {
1552 LASSERT(imp->imp_sec == NULL);
1553 cfs_spin_lock(&obd_zombie_impexp_lock);
1554 LASSERT(cfs_list_empty(&imp->imp_zombie_chain));
1555 cfs_list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1556 cfs_spin_unlock(&obd_zombie_impexp_lock);
1558 if (obd_zombie_impexp_notify != NULL)
1559 obd_zombie_impexp_notify();
1563 * notify import/export destroy thread about new zombie.
1565 static void obd_zombie_impexp_notify(void)
1567 cfs_waitq_signal(&obd_zombie_waitq);
1571 * check whether obd_zombie is idle
1573 static int obd_zombie_is_idle(void)
1577 LASSERT(!cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1578 cfs_spin_lock(&obd_zombie_impexp_lock);
1579 rc = cfs_list_empty(&obd_zombie_imports) &&
1580 cfs_list_empty(&obd_zombie_exports);
1581 cfs_spin_unlock(&obd_zombie_impexp_lock);
1586 * wait when obd_zombie import/export queues become empty
1588 void obd_zombie_barrier(void)
1590 struct l_wait_info lwi = { 0 };
1592 if (obd_zombie_pid == cfs_curproc_pid())
1593 /* don't wait for myself */
1595 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1597 EXPORT_SYMBOL(obd_zombie_barrier);
1602 * destroy zombie export/import thread.
1604 static int obd_zombie_impexp_thread(void *unused)
1608 if ((rc = cfs_daemonize_ctxt("obd_zombid"))) {
1609 cfs_complete(&obd_zombie_start);
1613 cfs_complete(&obd_zombie_start);
1615 obd_zombie_pid = cfs_curproc_pid();
1617 while(!cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1618 struct l_wait_info lwi = { 0 };
1620 l_wait_event(obd_zombie_waitq,
1621 !obd_zombie_impexp_check(NULL), &lwi);
1622 obd_zombie_impexp_cull();
1625 * Notify obd_zombie_barrier callers that queues
1628 cfs_waitq_signal(&obd_zombie_waitq);
1631 cfs_complete(&obd_zombie_stop);
1636 #else /* ! KERNEL */
1638 static cfs_atomic_t zombie_recur = CFS_ATOMIC_INIT(0);
1639 static void *obd_zombie_impexp_work_cb;
1640 static void *obd_zombie_impexp_idle_cb;
1642 int obd_zombie_impexp_kill(void *arg)
1646 if (cfs_atomic_inc_return(&zombie_recur) == 1) {
1647 obd_zombie_impexp_cull();
1650 cfs_atomic_dec(&zombie_recur);
1657 * start destroy zombie import/export thread
1659 int obd_zombie_impexp_init(void)
1663 CFS_INIT_LIST_HEAD(&obd_zombie_imports);
1664 CFS_INIT_LIST_HEAD(&obd_zombie_exports);
1665 cfs_spin_lock_init(&obd_zombie_impexp_lock);
1666 cfs_init_completion(&obd_zombie_start);
1667 cfs_init_completion(&obd_zombie_stop);
1668 cfs_waitq_init(&obd_zombie_waitq);
1672 rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
1676 cfs_wait_for_completion(&obd_zombie_start);
1679 obd_zombie_impexp_work_cb =
1680 liblustre_register_wait_callback("obd_zombi_impexp_kill",
1681 &obd_zombie_impexp_kill, NULL);
1683 obd_zombie_impexp_idle_cb =
1684 liblustre_register_idle_callback("obd_zombi_impexp_check",
1685 &obd_zombie_impexp_check, NULL);
1691 * stop destroy zombie import/export thread
1693 void obd_zombie_impexp_stop(void)
1695 cfs_set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1696 obd_zombie_impexp_notify();
1698 cfs_wait_for_completion(&obd_zombie_stop);
1700 liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb);
1701 liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb);