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 2008 Sun Microsystems, Inc. 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 struct list_head obd_types;
51 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 struct list_head obd_zombie_imports;
59 struct list_head obd_zombie_exports;
60 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)
101 struct list_head *tmp;
102 struct obd_type *type;
104 spin_lock(&obd_types_lock);
105 list_for_each(tmp, &obd_types) {
106 type = list_entry(tmp, struct obd_type, typ_chain);
107 if (strcmp(type->typ_name, name) == 0) {
108 spin_unlock(&obd_types_lock);
112 spin_unlock(&obd_types_lock);
116 struct obd_type *class_get_type(const char *name)
118 struct obd_type *type = class_search_type(name);
122 const char *modname = name;
123 if (!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 spin_lock(&type->obd_type_lock);
135 try_module_get(type->typ_dt_ops->o_owner);
136 spin_unlock(&type->obd_type_lock);
141 void class_put_type(struct obd_type *type)
144 spin_lock(&type->obd_type_lock);
146 module_put(type->typ_dt_ops->o_owner);
147 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 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 spin_lock(&obd_types_lock);
206 list_add(&type->typ_chain, &obd_types);
207 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 spin_lock(&obd_types_lock);
249 list_del(&type->typ_chain);
250 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 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 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 spin_lock(&obd_dev_lock);
359 obd_devs[obd->obd_minor] = NULL;
360 spin_unlock(&obd_dev_lock);
361 obd_device_free(obd);
363 class_put_type(obd_type);
366 int class_name2dev(const char *name)
373 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 spin_unlock(&obd_dev_lock);
387 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 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 spin_unlock(&obd_dev_lock);
414 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 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 atomic_read(&obd->obd_refcount));
478 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 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 spin_unlock(&obd_dev_lock);
507 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 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 spin_unlock(&obd_dev_lock);
539 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 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 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 spin_lock(&obd_dev_lock);
583 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 (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(list_empty(&exp->exp_outstanding_replies));
727 LASSERT(list_empty(&exp->exp_uncommitted_replies));
728 LASSERT(list_empty(&exp->exp_req_replay_queue));
729 LASSERT(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 atomic_inc(&exp->exp_refcount);
745 CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
746 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 atomic_read(&exp->exp_refcount) - 1);
756 LASSERT(atomic_read(&exp->exp_refcount) > 0);
757 LASSERT(atomic_read(&exp->exp_refcount) < 0x5a5a5a);
759 if (atomic_dec_and_test(&exp->exp_refcount)) {
760 LASSERT(!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;
778 OBD_ALLOC_PTR(export);
780 return ERR_PTR(-ENOMEM);
782 export->exp_conn_cnt = 0;
783 export->exp_lock_hash = NULL;
784 atomic_set(&export->exp_refcount, 2);
785 atomic_set(&export->exp_rpc_count, 0);
786 atomic_set(&export->exp_cb_count, 0);
787 atomic_set(&export->exp_locks_count, 0);
788 #if LUSTRE_TRACKS_LOCK_EXP_REFS
789 CFS_INIT_LIST_HEAD(&export->exp_locks_list);
790 spin_lock_init(&export->exp_locks_list_guard);
792 atomic_set(&export->exp_replay_count, 0);
793 export->exp_obd = obd;
794 CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies);
795 spin_lock_init(&export->exp_uncommitted_replies_lock);
796 CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies);
797 CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue);
798 CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
799 CFS_INIT_LIST_HEAD(&export->exp_queued_rpc);
800 class_handle_hash(&export->exp_handle, export_handle_addref);
801 export->exp_last_request_time = cfs_time_current_sec();
802 spin_lock_init(&export->exp_lock);
803 INIT_HLIST_NODE(&export->exp_uuid_hash);
804 INIT_HLIST_NODE(&export->exp_nid_hash);
806 export->exp_sp_peer = LUSTRE_SP_ANY;
807 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
808 export->exp_client_uuid = *cluuid;
809 obd_init_export(export);
811 spin_lock(&obd->obd_dev_lock);
812 /* shouldn't happen, but might race */
813 if (obd->obd_stopping)
814 GOTO(exit_err, rc = -ENODEV);
816 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
817 rc = cfs_hash_add_unique(obd->obd_uuid_hash, cluuid,
818 &export->exp_uuid_hash);
820 LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
821 obd->obd_name, cluuid->uuid, rc);
822 GOTO(exit_err, rc = -EALREADY);
826 class_incref(obd, "export", export);
827 list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
828 list_add_tail(&export->exp_obd_chain_timed,
829 &export->exp_obd->obd_exports_timed);
830 export->exp_obd->obd_num_exports++;
831 spin_unlock(&obd->obd_dev_lock);
835 spin_unlock(&obd->obd_dev_lock);
836 class_handle_unhash(&export->exp_handle);
837 LASSERT(hlist_unhashed(&export->exp_uuid_hash));
838 obd_destroy_export(export);
839 OBD_FREE_PTR(export);
842 EXPORT_SYMBOL(class_new_export);
844 void class_unlink_export(struct obd_export *exp)
846 class_handle_unhash(&exp->exp_handle);
848 spin_lock(&exp->exp_obd->obd_dev_lock);
849 /* delete an uuid-export hashitem from hashtables */
850 if (!hlist_unhashed(&exp->exp_uuid_hash))
851 cfs_hash_del(exp->exp_obd->obd_uuid_hash,
852 &exp->exp_client_uuid,
853 &exp->exp_uuid_hash);
855 list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
856 list_del_init(&exp->exp_obd_chain_timed);
857 exp->exp_obd->obd_num_exports--;
858 spin_unlock(&exp->exp_obd->obd_dev_lock);
859 class_export_put(exp);
861 EXPORT_SYMBOL(class_unlink_export);
863 /* Import management functions */
864 void class_import_destroy(struct obd_import *imp)
868 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
869 imp->imp_obd->obd_name);
871 LASSERT(atomic_read(&imp->imp_refcount) == 0);
873 ptlrpc_put_connection_superhack(imp->imp_connection);
875 while (!list_empty(&imp->imp_conn_list)) {
876 struct obd_import_conn *imp_conn;
878 imp_conn = list_entry(imp->imp_conn_list.next,
879 struct obd_import_conn, oic_item);
880 list_del_init(&imp_conn->oic_item);
881 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
882 OBD_FREE(imp_conn, sizeof(*imp_conn));
885 LASSERT(imp->imp_sec == NULL);
886 class_decref(imp->imp_obd, "import", imp);
887 OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
891 static void import_handle_addref(void *import)
893 class_import_get(import);
896 struct obd_import *class_import_get(struct obd_import *import)
898 LASSERT(atomic_read(&import->imp_refcount) >= 0);
899 LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a);
900 atomic_inc(&import->imp_refcount);
901 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
902 atomic_read(&import->imp_refcount),
903 import->imp_obd->obd_name);
906 EXPORT_SYMBOL(class_import_get);
908 void class_import_put(struct obd_import *imp)
912 LASSERT(atomic_read(&imp->imp_refcount) > 0);
913 LASSERT(atomic_read(&imp->imp_refcount) < 0x5a5a5a);
914 LASSERT(list_empty(&imp->imp_zombie_chain));
916 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
917 atomic_read(&imp->imp_refcount) - 1,
918 imp->imp_obd->obd_name);
920 if (atomic_dec_and_test(&imp->imp_refcount)) {
921 CDEBUG(D_INFO, "final put import %p\n", imp);
922 obd_zombie_import_add(imp);
927 EXPORT_SYMBOL(class_import_put);
929 static void init_imp_at(struct imp_at *at) {
931 at_init(&at->iat_net_latency, 0, 0);
932 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
933 /* max service estimates are tracked on the server side, so
934 don't use the AT history here, just use the last reported
935 val. (But keep hist for proc histogram, worst_ever) */
936 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
941 struct obd_import *class_new_import(struct obd_device *obd)
943 struct obd_import *imp;
945 OBD_ALLOC(imp, sizeof(*imp));
949 CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain);
950 CFS_INIT_LIST_HEAD(&imp->imp_replay_list);
951 CFS_INIT_LIST_HEAD(&imp->imp_sending_list);
952 CFS_INIT_LIST_HEAD(&imp->imp_delayed_list);
953 spin_lock_init(&imp->imp_lock);
954 imp->imp_last_success_conn = 0;
955 imp->imp_state = LUSTRE_IMP_NEW;
956 imp->imp_obd = class_incref(obd, "import", imp);
957 sema_init(&imp->imp_sec_mutex, 1);
958 cfs_waitq_init(&imp->imp_recovery_waitq);
960 atomic_set(&imp->imp_refcount, 2);
961 atomic_set(&imp->imp_unregistering, 0);
962 atomic_set(&imp->imp_inflight, 0);
963 atomic_set(&imp->imp_replay_inflight, 0);
964 atomic_set(&imp->imp_inval_count, 0);
965 CFS_INIT_LIST_HEAD(&imp->imp_conn_list);
966 CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link);
967 class_handle_hash(&imp->imp_handle, import_handle_addref);
968 init_imp_at(&imp->imp_at);
970 /* the default magic is V2, will be used in connect RPC, and
971 * then adjusted according to the flags in request/reply. */
972 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
976 EXPORT_SYMBOL(class_new_import);
978 void class_destroy_import(struct obd_import *import)
980 LASSERT(import != NULL);
981 LASSERT(import != LP_POISON);
983 class_handle_unhash(&import->imp_handle);
985 spin_lock(&import->imp_lock);
986 import->imp_generation++;
987 spin_unlock(&import->imp_lock);
988 class_import_put(import);
990 EXPORT_SYMBOL(class_destroy_import);
992 #if LUSTRE_TRACKS_LOCK_EXP_REFS
994 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
996 spin_lock(&exp->exp_locks_list_guard);
998 LASSERT(lock->l_exp_refs_nr >= 0);
1000 if (lock->l_exp_refs_target != NULL &&
1001 lock->l_exp_refs_target != exp) {
1002 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1003 exp, lock, lock->l_exp_refs_target);
1005 if ((lock->l_exp_refs_nr ++) == 0) {
1006 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1007 lock->l_exp_refs_target = exp;
1009 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1010 lock, exp, lock->l_exp_refs_nr);
1011 spin_unlock(&exp->exp_locks_list_guard);
1013 EXPORT_SYMBOL(__class_export_add_lock_ref);
1015 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1017 spin_lock(&exp->exp_locks_list_guard);
1018 LASSERT(lock->l_exp_refs_nr > 0);
1019 if (lock->l_exp_refs_target != exp) {
1020 LCONSOLE_WARN("lock %p, "
1021 "mismatching export pointers: %p, %p\n",
1022 lock, lock->l_exp_refs_target, exp);
1024 if (-- lock->l_exp_refs_nr == 0) {
1025 list_del_init(&lock->l_exp_refs_link);
1026 lock->l_exp_refs_target = NULL;
1028 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1029 lock, exp, lock->l_exp_refs_nr);
1030 spin_unlock(&exp->exp_locks_list_guard);
1032 EXPORT_SYMBOL(__class_export_del_lock_ref);
1035 /* A connection defines an export context in which preallocation can
1036 be managed. This releases the export pointer reference, and returns
1037 the export handle, so the export refcount is 1 when this function
1039 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1040 struct obd_uuid *cluuid)
1042 struct obd_export *export;
1043 LASSERT(conn != NULL);
1044 LASSERT(obd != NULL);
1045 LASSERT(cluuid != NULL);
1048 export = class_new_export(obd, cluuid);
1050 RETURN(PTR_ERR(export));
1052 conn->cookie = export->exp_handle.h_cookie;
1053 class_export_put(export);
1055 CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1056 cluuid->uuid, conn->cookie);
1059 EXPORT_SYMBOL(class_connect);
1061 /* if export is involved in recovery then clean up related things */
1062 void class_export_recovery_cleanup(struct obd_export *exp)
1064 struct obd_device *obd = exp->exp_obd;
1066 spin_lock_bh(&obd->obd_processing_task_lock);
1067 if (exp->exp_delayed)
1068 obd->obd_delayed_clients--;
1069 if (obd->obd_recovering && exp->exp_in_recovery) {
1070 spin_lock(&exp->exp_lock);
1071 exp->exp_in_recovery = 0;
1072 spin_unlock(&exp->exp_lock);
1073 LASSERT(obd->obd_connected_clients);
1074 obd->obd_connected_clients--;
1076 /** Cleanup req replay fields */
1077 if (exp->exp_req_replay_needed) {
1078 spin_lock(&exp->exp_lock);
1079 exp->exp_req_replay_needed = 0;
1080 spin_unlock(&exp->exp_lock);
1081 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1082 atomic_dec(&obd->obd_req_replay_clients);
1084 /** Cleanup lock replay data */
1085 if (exp->exp_lock_replay_needed) {
1086 spin_lock(&exp->exp_lock);
1087 exp->exp_lock_replay_needed = 0;
1088 spin_unlock(&exp->exp_lock);
1089 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1090 atomic_dec(&obd->obd_lock_replay_clients);
1092 spin_unlock_bh(&obd->obd_processing_task_lock);
1095 /* This function removes 1-3 references from the export:
1096 * 1 - for export pointer passed
1097 * and if disconnect really need
1098 * 2 - removing from hash
1099 * 3 - in client_unlink_export
1100 * The export pointer passed to this function can destroyed */
1101 int class_disconnect(struct obd_export *export)
1103 int already_disconnected;
1106 if (export == NULL) {
1108 CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export);
1112 spin_lock(&export->exp_lock);
1113 already_disconnected = export->exp_disconnected;
1114 export->exp_disconnected = 1;
1115 spin_unlock(&export->exp_lock);
1117 /* class_cleanup(), abort_recovery(), and class_fail_export()
1118 * all end up in here, and if any of them race we shouldn't
1119 * call extra class_export_puts(). */
1120 if (already_disconnected) {
1121 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1122 GOTO(no_disconn, already_disconnected);
1125 CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1126 export->exp_handle.h_cookie);
1128 if (!hlist_unhashed(&export->exp_nid_hash))
1129 cfs_hash_del(export->exp_obd->obd_nid_hash,
1130 &export->exp_connection->c_peer.nid,
1131 &export->exp_nid_hash);
1133 class_export_recovery_cleanup(export);
1134 class_unlink_export(export);
1136 class_export_put(export);
1140 /* Return non-zero for a fully connected export */
1141 int class_connected_export(struct obd_export *exp)
1145 spin_lock(&exp->exp_lock);
1146 connected = (exp->exp_conn_cnt > 0);
1147 spin_unlock(&exp->exp_lock);
1152 EXPORT_SYMBOL(class_connected_export);
1154 static void class_disconnect_export_list(struct list_head *list,
1155 enum obd_option flags)
1158 struct obd_export *exp;
1161 /* It's possible that an export may disconnect itself, but
1162 * nothing else will be added to this list. */
1163 while (!list_empty(list)) {
1164 exp = list_entry(list->next, struct obd_export, exp_obd_chain);
1165 /* need for safe call CDEBUG after obd_disconnect */
1166 class_export_get(exp);
1168 spin_lock(&exp->exp_lock);
1169 exp->exp_flags = flags;
1170 spin_unlock(&exp->exp_lock);
1172 if (obd_uuid_equals(&exp->exp_client_uuid,
1173 &exp->exp_obd->obd_uuid)) {
1175 "exp %p export uuid == obd uuid, don't discon\n",
1177 /* Need to delete this now so we don't end up pointing
1178 * to work_list later when this export is cleaned up. */
1179 list_del_init(&exp->exp_obd_chain);
1180 class_export_put(exp);
1184 class_export_get(exp);
1185 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1186 "last request at "CFS_TIME_T"\n",
1187 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1188 exp, exp->exp_last_request_time);
1189 /* release one export reference anyway */
1190 rc = obd_disconnect(exp);
1192 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1193 obd_export_nid2str(exp), exp, rc);
1194 class_export_put(exp);
1199 void class_disconnect_exports(struct obd_device *obd)
1201 struct list_head work_list;
1204 /* Move all of the exports from obd_exports to a work list, en masse. */
1205 CFS_INIT_LIST_HEAD(&work_list);
1206 spin_lock(&obd->obd_dev_lock);
1207 list_splice_init(&obd->obd_exports, &work_list);
1208 list_splice_init(&obd->obd_delayed_exports, &work_list);
1209 spin_unlock(&obd->obd_dev_lock);
1211 if (!list_empty(&work_list)) {
1212 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1213 "disconnecting them\n", obd->obd_minor, obd);
1214 class_disconnect_export_list(&work_list,
1215 exp_flags_from_obd(obd));
1217 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1218 obd->obd_minor, obd);
1221 EXPORT_SYMBOL(class_disconnect_exports);
1223 /* Remove exports that have not completed recovery.
1225 void class_disconnect_stale_exports(struct obd_device *obd,
1226 int (*test_export)(struct obd_export *))
1228 struct list_head work_list;
1229 struct list_head *pos, *n;
1230 struct obd_export *exp;
1234 CFS_INIT_LIST_HEAD(&work_list);
1235 spin_lock(&obd->obd_dev_lock);
1236 list_for_each_safe(pos, n, &obd->obd_exports) {
1237 exp = list_entry(pos, struct obd_export, exp_obd_chain);
1238 if (test_export(exp))
1241 /* don't count self-export as client */
1242 if (obd_uuid_equals(&exp->exp_client_uuid,
1243 &exp->exp_obd->obd_uuid))
1246 list_move(&exp->exp_obd_chain, &work_list);
1248 CDEBUG(D_ERROR, "%s: disconnect stale client %s@%s\n",
1249 obd->obd_name, exp->exp_client_uuid.uuid,
1250 exp->exp_connection == NULL ? "<unknown>" :
1251 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1252 print_export_data(exp, "EVICTING", 0);
1254 spin_unlock(&obd->obd_dev_lock);
1257 CDEBUG(D_HA, "%s: disconnecting %d stale clients\n",
1258 obd->obd_name, evicted);
1259 obd->obd_stale_clients += evicted;
1261 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1262 OBD_OPT_ABORT_RECOV);
1265 EXPORT_SYMBOL(class_disconnect_stale_exports);
1267 void class_fail_export(struct obd_export *exp)
1269 int rc, already_failed;
1271 spin_lock(&exp->exp_lock);
1272 already_failed = exp->exp_failed;
1273 exp->exp_failed = 1;
1274 spin_unlock(&exp->exp_lock);
1276 if (already_failed) {
1277 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1278 exp, exp->exp_client_uuid.uuid);
1282 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1283 exp, exp->exp_client_uuid.uuid);
1285 if (obd_dump_on_timeout)
1286 libcfs_debug_dumplog();
1288 /* Most callers into obd_disconnect are removing their own reference
1289 * (request, for example) in addition to the one from the hash table.
1290 * We don't have such a reference here, so make one. */
1291 class_export_get(exp);
1292 rc = obd_disconnect(exp);
1294 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1296 CDEBUG(D_HA, "disconnected export %p/%s\n",
1297 exp, exp->exp_client_uuid.uuid);
1299 EXPORT_SYMBOL(class_fail_export);
1301 char *obd_export_nid2str(struct obd_export *exp)
1303 if (exp->exp_connection != NULL)
1304 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1308 EXPORT_SYMBOL(obd_export_nid2str);
1310 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1312 struct obd_export *doomed_exp = NULL;
1313 int exports_evicted = 0;
1315 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1318 doomed_exp = cfs_hash_lookup(obd->obd_nid_hash, &nid_key);
1319 if (doomed_exp == NULL)
1322 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1323 "nid %s found, wanted nid %s, requested nid %s\n",
1324 obd_export_nid2str(doomed_exp),
1325 libcfs_nid2str(nid_key), nid);
1326 LASSERTF(doomed_exp != obd->obd_self_export,
1327 "self-export is hashed by NID?\n");
1329 CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n",
1330 obd->obd_name, nid, doomed_exp->exp_client_uuid.uuid,
1332 class_fail_export(doomed_exp);
1333 class_export_put(doomed_exp);
1336 if (!exports_evicted)
1337 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1338 obd->obd_name, nid);
1339 return exports_evicted;
1341 EXPORT_SYMBOL(obd_export_evict_by_nid);
1343 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1345 struct obd_export *doomed_exp = NULL;
1346 struct obd_uuid doomed_uuid;
1347 int exports_evicted = 0;
1349 obd_str2uuid(&doomed_uuid, uuid);
1350 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1351 CERROR("%s: can't evict myself\n", obd->obd_name);
1352 return exports_evicted;
1355 doomed_exp = cfs_hash_lookup(obd->obd_uuid_hash, &doomed_uuid);
1357 if (doomed_exp == NULL) {
1358 CERROR("%s: can't disconnect %s: no exports found\n",
1359 obd->obd_name, uuid);
1361 CWARN("%s: evicting %s at adminstrative request\n",
1362 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1363 class_fail_export(doomed_exp);
1364 class_export_put(doomed_exp);
1368 return exports_evicted;
1370 EXPORT_SYMBOL(obd_export_evict_by_uuid);
1372 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1373 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1374 EXPORT_SYMBOL(class_export_dump_hook);
1377 static void print_export_data(struct obd_export *exp, const char *status,
1380 struct ptlrpc_reply_state *rs;
1381 struct ptlrpc_reply_state *first_reply = NULL;
1384 spin_lock(&exp->exp_lock);
1385 list_for_each_entry (rs, &exp->exp_outstanding_replies, rs_exp_list) {
1390 spin_unlock(&exp->exp_lock);
1392 CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1393 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1394 obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1395 atomic_read(&exp->exp_rpc_count),
1396 atomic_read(&exp->exp_cb_count),
1397 atomic_read(&exp->exp_locks_count),
1398 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1399 nreplies, first_reply, nreplies > 3 ? "..." : "",
1400 exp->exp_last_committed);
1401 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1402 if (locks && class_export_dump_hook != NULL)
1403 class_export_dump_hook(exp);
1407 void dump_exports(struct obd_device *obd, int locks)
1409 struct obd_export *exp;
1411 spin_lock(&obd->obd_dev_lock);
1412 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1413 print_export_data(exp, "ACTIVE", locks);
1414 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1415 print_export_data(exp, "UNLINKED", locks);
1416 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1417 print_export_data(exp, "DELAYED", locks);
1418 spin_unlock(&obd->obd_dev_lock);
1419 spin_lock(&obd_zombie_impexp_lock);
1420 list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1421 print_export_data(exp, "ZOMBIE", locks);
1422 spin_unlock(&obd_zombie_impexp_lock);
1424 EXPORT_SYMBOL(dump_exports);
1426 void obd_exports_barrier(struct obd_device *obd)
1429 LASSERT(list_empty(&obd->obd_exports));
1430 spin_lock(&obd->obd_dev_lock);
1431 while (!list_empty(&obd->obd_unlinked_exports)) {
1432 spin_unlock(&obd->obd_dev_lock);
1433 cfs_schedule_timeout(CFS_TASK_UNINT, cfs_time_seconds(waited));
1434 if (waited > 5 && IS_PO2(waited)) {
1435 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1436 "more than %d seconds. "
1437 "The obd refcount = %d. Is it stuck?\n",
1438 obd->obd_name, waited,
1439 atomic_read(&obd->obd_refcount));
1440 dump_exports(obd, 0);
1443 spin_lock(&obd->obd_dev_lock);
1445 spin_unlock(&obd->obd_dev_lock);
1447 EXPORT_SYMBOL(obd_exports_barrier);
1450 * kill zombie imports and exports
1452 void obd_zombie_impexp_cull(void)
1454 struct obd_import *import;
1455 struct obd_export *export;
1459 spin_lock(&obd_zombie_impexp_lock);
1462 if (!list_empty(&obd_zombie_imports)) {
1463 import = list_entry(obd_zombie_imports.next,
1466 list_del_init(&import->imp_zombie_chain);
1470 if (!list_empty(&obd_zombie_exports)) {
1471 export = list_entry(obd_zombie_exports.next,
1474 list_del_init(&export->exp_obd_chain);
1477 spin_unlock(&obd_zombie_impexp_lock);
1480 class_import_destroy(import);
1483 class_export_destroy(export);
1485 } while (import != NULL || export != NULL);
1489 static struct completion obd_zombie_start;
1490 static struct completion obd_zombie_stop;
1491 static unsigned long obd_zombie_flags;
1492 static cfs_waitq_t obd_zombie_waitq;
1493 static pid_t obd_zombie_pid;
1496 OBD_ZOMBIE_STOP = 1 << 1
1500 * check for work for kill zombie import/export thread.
1502 static int obd_zombie_impexp_check(void *arg)
1506 spin_lock(&obd_zombie_impexp_lock);
1507 rc = list_empty(&obd_zombie_imports) &&
1508 list_empty(&obd_zombie_exports) &&
1509 !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1511 spin_unlock(&obd_zombie_impexp_lock);
1517 * Add export to the obd_zombe thread and notify it.
1519 static void obd_zombie_export_add(struct obd_export *exp) {
1520 spin_lock(&exp->exp_obd->obd_dev_lock);
1521 LASSERT(!list_empty(&exp->exp_obd_chain));
1522 list_del_init(&exp->exp_obd_chain);
1523 spin_unlock(&exp->exp_obd->obd_dev_lock);
1524 spin_lock(&obd_zombie_impexp_lock);
1525 list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1526 spin_unlock(&obd_zombie_impexp_lock);
1528 if (obd_zombie_impexp_notify != NULL)
1529 obd_zombie_impexp_notify();
1533 * Add import to the obd_zombe thread and notify it.
1535 static void obd_zombie_import_add(struct obd_import *imp) {
1536 LASSERT(imp->imp_sec == NULL);
1537 spin_lock(&obd_zombie_impexp_lock);
1538 LASSERT(list_empty(&imp->imp_zombie_chain));
1539 list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1540 spin_unlock(&obd_zombie_impexp_lock);
1542 if (obd_zombie_impexp_notify != NULL)
1543 obd_zombie_impexp_notify();
1547 * notify import/export destroy thread about new zombie.
1549 static void obd_zombie_impexp_notify(void)
1551 cfs_waitq_signal(&obd_zombie_waitq);
1555 * check whether obd_zombie is idle
1557 static int obd_zombie_is_idle(void)
1561 LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1562 spin_lock(&obd_zombie_impexp_lock);
1563 rc = list_empty(&obd_zombie_imports) &&
1564 list_empty(&obd_zombie_exports);
1565 spin_unlock(&obd_zombie_impexp_lock);
1570 * wait when obd_zombie import/export queues become empty
1572 void obd_zombie_barrier(void)
1574 struct l_wait_info lwi = { 0 };
1576 if (obd_zombie_pid == cfs_curproc_pid())
1577 /* don't wait for myself */
1579 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1581 EXPORT_SYMBOL(obd_zombie_barrier);
1586 * destroy zombie export/import thread.
1588 static int obd_zombie_impexp_thread(void *unused)
1592 if ((rc = cfs_daemonize_ctxt("obd_zombid"))) {
1593 complete(&obd_zombie_start);
1597 complete(&obd_zombie_start);
1599 obd_zombie_pid = cfs_curproc_pid();
1601 while(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1602 struct l_wait_info lwi = { 0 };
1604 l_wait_event(obd_zombie_waitq,
1605 !obd_zombie_impexp_check(NULL), &lwi);
1606 obd_zombie_impexp_cull();
1609 * Notify obd_zombie_barrier callers that queues
1612 cfs_waitq_signal(&obd_zombie_waitq);
1615 complete(&obd_zombie_stop);
1620 #else /* ! KERNEL */
1622 static atomic_t zombie_recur = ATOMIC_INIT(0);
1623 static void *obd_zombie_impexp_work_cb;
1624 static void *obd_zombie_impexp_idle_cb;
1626 int obd_zombie_impexp_kill(void *arg)
1630 if (atomic_inc_return(&zombie_recur) == 1) {
1631 obd_zombie_impexp_cull();
1634 atomic_dec(&zombie_recur);
1641 * start destroy zombie import/export thread
1643 int obd_zombie_impexp_init(void)
1647 CFS_INIT_LIST_HEAD(&obd_zombie_imports);
1648 CFS_INIT_LIST_HEAD(&obd_zombie_exports);
1649 spin_lock_init(&obd_zombie_impexp_lock);
1650 init_completion(&obd_zombie_start);
1651 init_completion(&obd_zombie_stop);
1652 cfs_waitq_init(&obd_zombie_waitq);
1656 rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
1660 wait_for_completion(&obd_zombie_start);
1663 obd_zombie_impexp_work_cb =
1664 liblustre_register_wait_callback("obd_zombi_impexp_kill",
1665 &obd_zombie_impexp_kill, NULL);
1667 obd_zombie_impexp_idle_cb =
1668 liblustre_register_idle_callback("obd_zombi_impexp_check",
1669 &obd_zombie_impexp_check, NULL);
1675 * stop destroy zombie import/export thread
1677 void obd_zombie_impexp_stop(void)
1679 set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1680 obd_zombie_impexp_notify();
1682 wait_for_completion(&obd_zombie_stop);
1684 liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb);
1685 liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb);