4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2014, Intel Corporation.
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 <linux/kthread.h>
45 #include <obd_class.h>
46 #include <lprocfs_status.h>
47 #include <lustre_disk.h>
48 #include <lustre_kernelcomm.h>
50 spinlock_t obd_types_lock;
52 static struct kmem_cache *obd_device_cachep;
53 struct kmem_cache *obdo_cachep;
54 EXPORT_SYMBOL(obdo_cachep);
55 static struct kmem_cache *import_cachep;
57 static struct list_head obd_zombie_imports;
58 static struct list_head obd_zombie_exports;
59 static 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 struct list_head obd_stale_exports;
68 spinlock_t obd_stale_export_lock;
69 atomic_t obd_stale_export_num;
71 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
72 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
75 * support functions: we could use inter-module communication, but this
76 * is more portable to other OS's
78 static struct obd_device *obd_device_alloc(void)
80 struct obd_device *obd;
82 OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, GFP_NOFS);
84 obd->obd_magic = OBD_DEVICE_MAGIC;
89 static void obd_device_free(struct obd_device *obd)
92 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
93 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
94 if (obd->obd_namespace != NULL) {
95 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
96 obd, obd->obd_namespace, obd->obd_force);
99 lu_ref_fini(&obd->obd_reference);
100 OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
103 struct obd_type *class_search_type(const char *name)
105 struct list_head *tmp;
106 struct obd_type *type;
108 spin_lock(&obd_types_lock);
109 list_for_each(tmp, &obd_types) {
110 type = list_entry(tmp, struct obd_type, typ_chain);
111 if (strcmp(type->typ_name, name) == 0) {
112 spin_unlock(&obd_types_lock);
116 spin_unlock(&obd_types_lock);
119 EXPORT_SYMBOL(class_search_type);
121 struct obd_type *class_get_type(const char *name)
123 struct obd_type *type = class_search_type(name);
125 #ifdef HAVE_MODULE_LOADING_SUPPORT
127 const char *modname = name;
129 if (strcmp(modname, "obdfilter") == 0)
132 if (strcmp(modname, LUSTRE_LWP_NAME) == 0)
133 modname = LUSTRE_OSP_NAME;
135 if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME)))
136 modname = LUSTRE_MDT_NAME;
138 if (!request_module("%s", modname)) {
139 CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
140 type = class_search_type(name);
142 LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
148 spin_lock(&type->obd_type_lock);
150 try_module_get(type->typ_dt_ops->o_owner);
151 spin_unlock(&type->obd_type_lock);
156 void class_put_type(struct obd_type *type)
159 spin_lock(&type->obd_type_lock);
161 module_put(type->typ_dt_ops->o_owner);
162 spin_unlock(&type->obd_type_lock);
165 #define CLASS_MAX_NAME 1024
167 int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
168 bool enable_proc, struct lprocfs_vars *vars,
169 const char *name, struct lu_device_type *ldt)
171 struct obd_type *type;
176 LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
178 if (class_search_type(name)) {
179 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
184 OBD_ALLOC(type, sizeof(*type));
188 OBD_ALLOC_PTR(type->typ_dt_ops);
189 OBD_ALLOC_PTR(type->typ_md_ops);
190 OBD_ALLOC(type->typ_name, strlen(name) + 1);
192 if (type->typ_dt_ops == NULL ||
193 type->typ_md_ops == NULL ||
194 type->typ_name == NULL)
197 *(type->typ_dt_ops) = *dt_ops;
198 /* md_ops is optional */
200 *(type->typ_md_ops) = *md_ops;
201 strcpy(type->typ_name, name);
202 spin_lock_init(&type->obd_type_lock);
204 #ifdef CONFIG_PROC_FS
206 type->typ_procroot = lprocfs_register(type->typ_name,
209 if (IS_ERR(type->typ_procroot)) {
210 rc = PTR_ERR(type->typ_procroot);
211 type->typ_procroot = NULL;
218 rc = lu_device_type_init(ldt);
223 spin_lock(&obd_types_lock);
224 list_add(&type->typ_chain, &obd_types);
225 spin_unlock(&obd_types_lock);
230 if (type->typ_name != NULL) {
231 #ifdef CONFIG_PROC_FS
232 if (type->typ_procroot != NULL)
233 remove_proc_subtree(type->typ_name, proc_lustre_root);
235 OBD_FREE(type->typ_name, strlen(name) + 1);
237 if (type->typ_md_ops != NULL)
238 OBD_FREE_PTR(type->typ_md_ops);
239 if (type->typ_dt_ops != NULL)
240 OBD_FREE_PTR(type->typ_dt_ops);
241 OBD_FREE(type, sizeof(*type));
244 EXPORT_SYMBOL(class_register_type);
246 int class_unregister_type(const char *name)
248 struct obd_type *type = class_search_type(name);
252 CERROR("unknown obd type\n");
256 if (type->typ_refcnt) {
257 CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt);
258 /* This is a bad situation, let's make the best of it */
259 /* Remove ops, but leave the name for debugging */
260 OBD_FREE_PTR(type->typ_dt_ops);
261 OBD_FREE_PTR(type->typ_md_ops);
265 /* we do not use type->typ_procroot as for compatibility purposes
266 * other modules can share names (i.e. lod can use lov entry). so
267 * we can't reference pointer as it can get invalided when another
268 * module removes the entry */
269 #ifdef CONFIG_PROC_FS
270 if (type->typ_procroot != NULL)
271 remove_proc_subtree(type->typ_name, proc_lustre_root);
272 if (type->typ_procsym != NULL)
273 lprocfs_remove(&type->typ_procsym);
276 lu_device_type_fini(type->typ_lu);
278 spin_lock(&obd_types_lock);
279 list_del(&type->typ_chain);
280 spin_unlock(&obd_types_lock);
281 OBD_FREE(type->typ_name, strlen(name) + 1);
282 if (type->typ_dt_ops != NULL)
283 OBD_FREE_PTR(type->typ_dt_ops);
284 if (type->typ_md_ops != NULL)
285 OBD_FREE_PTR(type->typ_md_ops);
286 OBD_FREE(type, sizeof(*type));
288 } /* class_unregister_type */
289 EXPORT_SYMBOL(class_unregister_type);
292 * Create a new obd device.
294 * Find an empty slot in ::obd_devs[], create a new obd device in it.
296 * \param[in] type_name obd device type string.
297 * \param[in] name obd device name.
299 * \retval NULL if create fails, otherwise return the obd device
302 struct obd_device *class_newdev(const char *type_name, const char *name)
304 struct obd_device *result = NULL;
305 struct obd_device *newdev;
306 struct obd_type *type = NULL;
308 int new_obd_minor = 0;
311 if (strlen(name) >= MAX_OBD_NAME) {
312 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
313 RETURN(ERR_PTR(-EINVAL));
316 type = class_get_type(type_name);
318 CERROR("OBD: unknown type: %s\n", type_name);
319 RETURN(ERR_PTR(-ENODEV));
322 newdev = obd_device_alloc();
324 GOTO(out_type, result = ERR_PTR(-ENOMEM));
326 LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
328 write_lock(&obd_dev_lock);
329 for (i = 0; i < class_devno_max(); i++) {
330 struct obd_device *obd = class_num2obd(i);
332 if (obd && (strcmp(name, obd->obd_name) == 0)) {
333 CERROR("Device %s already exists at %d, won't add\n",
336 LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
337 "%p obd_magic %08x != %08x\n", result,
338 result->obd_magic, OBD_DEVICE_MAGIC);
339 LASSERTF(result->obd_minor == new_obd_minor,
340 "%p obd_minor %d != %d\n", result,
341 result->obd_minor, new_obd_minor);
343 obd_devs[result->obd_minor] = NULL;
344 result->obd_name[0]='\0';
346 result = ERR_PTR(-EEXIST);
349 if (!result && !obd) {
351 result->obd_minor = i;
353 result->obd_type = type;
354 strncpy(result->obd_name, name,
355 sizeof(result->obd_name) - 1);
356 obd_devs[i] = result;
359 write_unlock(&obd_dev_lock);
361 if (result == NULL && i >= class_devno_max()) {
362 CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n",
364 GOTO(out, result = ERR_PTR(-EOVERFLOW));
370 CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
371 result->obd_name, result);
375 obd_device_free(newdev);
377 class_put_type(type);
381 void class_release_dev(struct obd_device *obd)
383 struct obd_type *obd_type = obd->obd_type;
385 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n",
386 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
387 LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
388 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
389 LASSERT(obd_type != NULL);
391 CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n",
392 obd->obd_name, obd->obd_minor, obd->obd_type->typ_name);
394 write_lock(&obd_dev_lock);
395 obd_devs[obd->obd_minor] = NULL;
396 write_unlock(&obd_dev_lock);
397 obd_device_free(obd);
399 class_put_type(obd_type);
402 int class_name2dev(const char *name)
409 read_lock(&obd_dev_lock);
410 for (i = 0; i < class_devno_max(); i++) {
411 struct obd_device *obd = class_num2obd(i);
413 if (obd && strcmp(name, obd->obd_name) == 0) {
414 /* Make sure we finished attaching before we give
415 out any references */
416 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
417 if (obd->obd_attached) {
418 read_unlock(&obd_dev_lock);
424 read_unlock(&obd_dev_lock);
429 struct obd_device *class_name2obd(const char *name)
431 int dev = class_name2dev(name);
433 if (dev < 0 || dev > class_devno_max())
435 return class_num2obd(dev);
437 EXPORT_SYMBOL(class_name2obd);
439 int class_uuid2dev(struct obd_uuid *uuid)
443 read_lock(&obd_dev_lock);
444 for (i = 0; i < class_devno_max(); i++) {
445 struct obd_device *obd = class_num2obd(i);
447 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
448 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
449 read_unlock(&obd_dev_lock);
453 read_unlock(&obd_dev_lock);
458 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
460 int dev = class_uuid2dev(uuid);
463 return class_num2obd(dev);
465 EXPORT_SYMBOL(class_uuid2obd);
468 * Get obd device from ::obd_devs[]
470 * \param num [in] array index
472 * \retval NULL if ::obd_devs[\a num] does not contains an obd device
473 * otherwise return the obd device there.
475 struct obd_device *class_num2obd(int num)
477 struct obd_device *obd = NULL;
479 if (num < class_devno_max()) {
484 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
485 "%p obd_magic %08x != %08x\n",
486 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
487 LASSERTF(obd->obd_minor == num,
488 "%p obd_minor %0d != %0d\n",
489 obd, obd->obd_minor, num);
496 * Get obd devices count. Device in any
498 * \retval obd device count
500 int get_devices_count(void)
502 int index, max_index = class_devno_max(), dev_count = 0;
504 read_lock(&obd_dev_lock);
505 for (index = 0; index <= max_index; index++) {
506 struct obd_device *obd = class_num2obd(index);
510 read_unlock(&obd_dev_lock);
514 EXPORT_SYMBOL(get_devices_count);
516 void class_obd_list(void)
521 read_lock(&obd_dev_lock);
522 for (i = 0; i < class_devno_max(); i++) {
523 struct obd_device *obd = class_num2obd(i);
527 if (obd->obd_stopping)
529 else if (obd->obd_set_up)
531 else if (obd->obd_attached)
535 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
536 i, status, obd->obd_type->typ_name,
537 obd->obd_name, obd->obd_uuid.uuid,
538 atomic_read(&obd->obd_refcount));
540 read_unlock(&obd_dev_lock);
544 /* Search for a client OBD connected to tgt_uuid. If grp_uuid is
545 specified, then only the client with that uuid is returned,
546 otherwise any client connected to the tgt is returned. */
547 struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid,
548 const char * typ_name,
549 struct obd_uuid *grp_uuid)
553 read_lock(&obd_dev_lock);
554 for (i = 0; i < class_devno_max(); i++) {
555 struct obd_device *obd = class_num2obd(i);
559 if ((strncmp(obd->obd_type->typ_name, typ_name,
560 strlen(typ_name)) == 0)) {
561 if (obd_uuid_equals(tgt_uuid,
562 &obd->u.cli.cl_target_uuid) &&
563 ((grp_uuid)? obd_uuid_equals(grp_uuid,
564 &obd->obd_uuid) : 1)) {
565 read_unlock(&obd_dev_lock);
570 read_unlock(&obd_dev_lock);
574 EXPORT_SYMBOL(class_find_client_obd);
576 /* Iterate the obd_device list looking devices have grp_uuid. Start
577 searching at *next, and if a device is found, the next index to look
578 at is saved in *next. If next is NULL, then the first matching device
579 will always be returned. */
580 struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
586 else if (*next >= 0 && *next < class_devno_max())
591 read_lock(&obd_dev_lock);
592 for (; i < class_devno_max(); i++) {
593 struct obd_device *obd = class_num2obd(i);
597 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
600 read_unlock(&obd_dev_lock);
604 read_unlock(&obd_dev_lock);
608 EXPORT_SYMBOL(class_devices_in_group);
611 * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
612 * adjust sptlrpc settings accordingly.
614 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
616 struct obd_device *obd;
620 LASSERT(namelen > 0);
622 read_lock(&obd_dev_lock);
623 for (i = 0; i < class_devno_max(); i++) {
624 obd = class_num2obd(i);
626 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
629 /* only notify mdc, osc, osp, lwp, mdt, ost
630 * because only these have a -sptlrpc llog */
631 type = obd->obd_type->typ_name;
632 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
633 strcmp(type, LUSTRE_OSC_NAME) != 0 &&
634 strcmp(type, LUSTRE_OSP_NAME) != 0 &&
635 strcmp(type, LUSTRE_LWP_NAME) != 0 &&
636 strcmp(type, LUSTRE_MDT_NAME) != 0 &&
637 strcmp(type, LUSTRE_OST_NAME) != 0)
640 if (strncmp(obd->obd_name, fsname, namelen))
643 class_incref(obd, __FUNCTION__, obd);
644 read_unlock(&obd_dev_lock);
645 rc2 = obd_set_info_async(NULL, obd->obd_self_export,
646 sizeof(KEY_SPTLRPC_CONF),
647 KEY_SPTLRPC_CONF, 0, NULL, NULL);
649 class_decref(obd, __FUNCTION__, obd);
650 read_lock(&obd_dev_lock);
652 read_unlock(&obd_dev_lock);
655 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
657 void obd_cleanup_caches(void)
660 if (obd_device_cachep) {
661 kmem_cache_destroy(obd_device_cachep);
662 obd_device_cachep = NULL;
665 kmem_cache_destroy(obdo_cachep);
669 kmem_cache_destroy(import_cachep);
670 import_cachep = NULL;
676 int obd_init_caches(void)
681 LASSERT(obd_device_cachep == NULL);
682 obd_device_cachep = kmem_cache_create("ll_obd_dev_cache",
683 sizeof(struct obd_device),
685 if (!obd_device_cachep)
686 GOTO(out, rc = -ENOMEM);
688 LASSERT(obdo_cachep == NULL);
689 obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo),
692 GOTO(out, rc = -ENOMEM);
694 LASSERT(import_cachep == NULL);
695 import_cachep = kmem_cache_create("ll_import_cache",
696 sizeof(struct obd_import),
699 GOTO(out, rc = -ENOMEM);
703 obd_cleanup_caches();
707 /* map connection to client */
708 struct obd_export *class_conn2export(struct lustre_handle *conn)
710 struct obd_export *export;
714 CDEBUG(D_CACHE, "looking for null handle\n");
718 if (conn->cookie == -1) { /* this means assign a new connection */
719 CDEBUG(D_CACHE, "want a new connection\n");
723 CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie);
724 export = class_handle2object(conn->cookie, NULL);
727 EXPORT_SYMBOL(class_conn2export);
729 struct obd_device *class_exp2obd(struct obd_export *exp)
735 EXPORT_SYMBOL(class_exp2obd);
737 struct obd_device *class_conn2obd(struct lustre_handle *conn)
739 struct obd_export *export;
740 export = class_conn2export(conn);
742 struct obd_device *obd = export->exp_obd;
743 class_export_put(export);
749 struct obd_import *class_exp2cliimp(struct obd_export *exp)
751 struct obd_device *obd = exp->exp_obd;
754 return obd->u.cli.cl_import;
756 EXPORT_SYMBOL(class_exp2cliimp);
758 struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
760 struct obd_device *obd = class_conn2obd(conn);
763 return obd->u.cli.cl_import;
766 /* Export management functions */
767 static void class_export_destroy(struct obd_export *exp)
769 struct obd_device *obd = exp->exp_obd;
772 LASSERT_ATOMIC_ZERO(&exp->exp_refcount);
773 LASSERT(obd != NULL);
775 CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
776 exp->exp_client_uuid.uuid, obd->obd_name);
778 /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
779 if (exp->exp_connection)
780 ptlrpc_put_connection_superhack(exp->exp_connection);
782 LASSERT(list_empty(&exp->exp_outstanding_replies));
783 LASSERT(list_empty(&exp->exp_uncommitted_replies));
784 LASSERT(list_empty(&exp->exp_req_replay_queue));
785 LASSERT(list_empty(&exp->exp_hp_rpcs));
786 obd_destroy_export(exp);
787 class_decref(obd, "export", exp);
789 OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
793 static void export_handle_addref(void *export)
795 class_export_get(export);
798 static struct portals_handle_ops export_handle_ops = {
799 .hop_addref = export_handle_addref,
803 struct obd_export *class_export_get(struct obd_export *exp)
805 atomic_inc(&exp->exp_refcount);
806 CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
807 atomic_read(&exp->exp_refcount));
810 EXPORT_SYMBOL(class_export_get);
812 void class_export_put(struct obd_export *exp)
814 LASSERT(exp != NULL);
815 LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON);
816 CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
817 atomic_read(&exp->exp_refcount) - 1);
819 if (atomic_dec_and_test(&exp->exp_refcount)) {
820 LASSERT(!list_empty(&exp->exp_obd_chain));
821 LASSERT(list_empty(&exp->exp_stale_list));
822 CDEBUG(D_IOCTL, "final put %p/%s\n",
823 exp, exp->exp_client_uuid.uuid);
825 /* release nid stat refererence */
826 lprocfs_exp_cleanup(exp);
828 obd_zombie_export_add(exp);
831 EXPORT_SYMBOL(class_export_put);
833 /* Creates a new export, adds it to the hash table, and returns a
834 * pointer to it. The refcount is 2: one for the hash reference, and
835 * one for the pointer returned by this function. */
836 struct obd_export *class_new_export(struct obd_device *obd,
837 struct obd_uuid *cluuid)
839 struct obd_export *export;
840 struct cfs_hash *hash = NULL;
844 OBD_ALLOC_PTR(export);
846 return ERR_PTR(-ENOMEM);
848 export->exp_conn_cnt = 0;
849 export->exp_lock_hash = NULL;
850 export->exp_flock_hash = NULL;
851 atomic_set(&export->exp_refcount, 2);
852 atomic_set(&export->exp_rpc_count, 0);
853 atomic_set(&export->exp_cb_count, 0);
854 atomic_set(&export->exp_locks_count, 0);
855 #if LUSTRE_TRACKS_LOCK_EXP_REFS
856 INIT_LIST_HEAD(&export->exp_locks_list);
857 spin_lock_init(&export->exp_locks_list_guard);
859 atomic_set(&export->exp_replay_count, 0);
860 export->exp_obd = obd;
861 INIT_LIST_HEAD(&export->exp_outstanding_replies);
862 spin_lock_init(&export->exp_uncommitted_replies_lock);
863 INIT_LIST_HEAD(&export->exp_uncommitted_replies);
864 INIT_LIST_HEAD(&export->exp_req_replay_queue);
865 INIT_LIST_HEAD(&export->exp_handle.h_link);
866 INIT_LIST_HEAD(&export->exp_hp_rpcs);
867 INIT_LIST_HEAD(&export->exp_reg_rpcs);
868 class_handle_hash(&export->exp_handle, &export_handle_ops);
869 export->exp_last_request_time = cfs_time_current_sec();
870 spin_lock_init(&export->exp_lock);
871 spin_lock_init(&export->exp_rpc_lock);
872 INIT_HLIST_NODE(&export->exp_uuid_hash);
873 INIT_HLIST_NODE(&export->exp_nid_hash);
874 INIT_HLIST_NODE(&export->exp_gen_hash);
875 spin_lock_init(&export->exp_bl_list_lock);
876 INIT_LIST_HEAD(&export->exp_bl_list);
877 INIT_LIST_HEAD(&export->exp_stale_list);
879 export->exp_sp_peer = LUSTRE_SP_ANY;
880 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
881 export->exp_client_uuid = *cluuid;
882 obd_init_export(export);
884 spin_lock(&obd->obd_dev_lock);
885 /* shouldn't happen, but might race */
886 if (obd->obd_stopping)
887 GOTO(exit_unlock, rc = -ENODEV);
889 hash = cfs_hash_getref(obd->obd_uuid_hash);
891 GOTO(exit_unlock, rc = -ENODEV);
892 spin_unlock(&obd->obd_dev_lock);
894 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
895 rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash);
897 LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
898 obd->obd_name, cluuid->uuid, rc);
899 GOTO(exit_err, rc = -EALREADY);
903 at_init(&export->exp_bl_lock_at, obd_timeout, 0);
904 spin_lock(&obd->obd_dev_lock);
905 if (obd->obd_stopping) {
906 cfs_hash_del(hash, cluuid, &export->exp_uuid_hash);
907 GOTO(exit_unlock, rc = -ENODEV);
910 class_incref(obd, "export", export);
911 list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
912 list_add_tail(&export->exp_obd_chain_timed,
913 &export->exp_obd->obd_exports_timed);
914 export->exp_obd->obd_num_exports++;
915 spin_unlock(&obd->obd_dev_lock);
916 cfs_hash_putref(hash);
920 spin_unlock(&obd->obd_dev_lock);
923 cfs_hash_putref(hash);
924 class_handle_unhash(&export->exp_handle);
925 LASSERT(hlist_unhashed(&export->exp_uuid_hash));
926 obd_destroy_export(export);
927 OBD_FREE_PTR(export);
930 EXPORT_SYMBOL(class_new_export);
932 void class_unlink_export(struct obd_export *exp)
934 class_handle_unhash(&exp->exp_handle);
936 spin_lock(&exp->exp_obd->obd_dev_lock);
937 /* delete an uuid-export hashitem from hashtables */
938 if (!hlist_unhashed(&exp->exp_uuid_hash))
939 cfs_hash_del(exp->exp_obd->obd_uuid_hash,
940 &exp->exp_client_uuid,
941 &exp->exp_uuid_hash);
943 if (!hlist_unhashed(&exp->exp_gen_hash)) {
944 struct tg_export_data *ted = &exp->exp_target_data;
945 struct cfs_hash *hash;
947 hash = cfs_hash_getref(exp->exp_obd->obd_gen_hash);
948 cfs_hash_del(hash, &ted->ted_lcd->lcd_generation,
950 cfs_hash_putref(hash);
953 list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
954 list_del_init(&exp->exp_obd_chain_timed);
955 exp->exp_obd->obd_num_exports--;
956 spin_unlock(&exp->exp_obd->obd_dev_lock);
957 atomic_inc(&obd_stale_export_num);
959 /* A reference is kept by obd_stale_exports list */
960 obd_stale_export_put(exp);
963 /* Import management functions */
964 static void class_import_destroy(struct obd_import *imp)
968 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
969 imp->imp_obd->obd_name);
971 LASSERT_ATOMIC_ZERO(&imp->imp_refcount);
973 ptlrpc_put_connection_superhack(imp->imp_connection);
975 while (!list_empty(&imp->imp_conn_list)) {
976 struct obd_import_conn *imp_conn;
978 imp_conn = list_entry(imp->imp_conn_list.next,
979 struct obd_import_conn, oic_item);
980 list_del_init(&imp_conn->oic_item);
981 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
982 OBD_FREE(imp_conn, sizeof(*imp_conn));
985 LASSERT(imp->imp_sec == NULL);
986 class_decref(imp->imp_obd, "import", imp);
987 OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
991 static void import_handle_addref(void *import)
993 class_import_get(import);
996 static struct portals_handle_ops import_handle_ops = {
997 .hop_addref = import_handle_addref,
1001 struct obd_import *class_import_get(struct obd_import *import)
1003 atomic_inc(&import->imp_refcount);
1004 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
1005 atomic_read(&import->imp_refcount),
1006 import->imp_obd->obd_name);
1009 EXPORT_SYMBOL(class_import_get);
1011 void class_import_put(struct obd_import *imp)
1015 LASSERT(list_empty(&imp->imp_zombie_chain));
1016 LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON);
1018 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
1019 atomic_read(&imp->imp_refcount) - 1,
1020 imp->imp_obd->obd_name);
1022 if (atomic_dec_and_test(&imp->imp_refcount)) {
1023 CDEBUG(D_INFO, "final put import %p\n", imp);
1024 obd_zombie_import_add(imp);
1027 /* catch possible import put race */
1028 LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON);
1031 EXPORT_SYMBOL(class_import_put);
1033 static void init_imp_at(struct imp_at *at) {
1035 at_init(&at->iat_net_latency, 0, 0);
1036 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1037 /* max service estimates are tracked on the server side, so
1038 don't use the AT history here, just use the last reported
1039 val. (But keep hist for proc histogram, worst_ever) */
1040 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
1045 struct obd_import *class_new_import(struct obd_device *obd)
1047 struct obd_import *imp;
1049 OBD_ALLOC(imp, sizeof(*imp));
1053 INIT_LIST_HEAD(&imp->imp_pinger_chain);
1054 INIT_LIST_HEAD(&imp->imp_zombie_chain);
1055 INIT_LIST_HEAD(&imp->imp_replay_list);
1056 INIT_LIST_HEAD(&imp->imp_sending_list);
1057 INIT_LIST_HEAD(&imp->imp_delayed_list);
1058 INIT_LIST_HEAD(&imp->imp_committed_list);
1059 imp->imp_replay_cursor = &imp->imp_committed_list;
1060 spin_lock_init(&imp->imp_lock);
1061 imp->imp_last_success_conn = 0;
1062 imp->imp_state = LUSTRE_IMP_NEW;
1063 imp->imp_obd = class_incref(obd, "import", imp);
1064 mutex_init(&imp->imp_sec_mutex);
1065 init_waitqueue_head(&imp->imp_recovery_waitq);
1067 atomic_set(&imp->imp_refcount, 2);
1068 atomic_set(&imp->imp_unregistering, 0);
1069 atomic_set(&imp->imp_inflight, 0);
1070 atomic_set(&imp->imp_replay_inflight, 0);
1071 atomic_set(&imp->imp_inval_count, 0);
1072 INIT_LIST_HEAD(&imp->imp_conn_list);
1073 INIT_LIST_HEAD(&imp->imp_handle.h_link);
1074 class_handle_hash(&imp->imp_handle, &import_handle_ops);
1075 init_imp_at(&imp->imp_at);
1077 /* the default magic is V2, will be used in connect RPC, and
1078 * then adjusted according to the flags in request/reply. */
1079 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
1083 EXPORT_SYMBOL(class_new_import);
1085 void class_destroy_import(struct obd_import *import)
1087 LASSERT(import != NULL);
1088 LASSERT(import != LP_POISON);
1090 class_handle_unhash(&import->imp_handle);
1092 spin_lock(&import->imp_lock);
1093 import->imp_generation++;
1094 spin_unlock(&import->imp_lock);
1095 class_import_put(import);
1097 EXPORT_SYMBOL(class_destroy_import);
1099 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1101 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1103 spin_lock(&exp->exp_locks_list_guard);
1105 LASSERT(lock->l_exp_refs_nr >= 0);
1107 if (lock->l_exp_refs_target != NULL &&
1108 lock->l_exp_refs_target != exp) {
1109 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1110 exp, lock, lock->l_exp_refs_target);
1112 if ((lock->l_exp_refs_nr ++) == 0) {
1113 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1114 lock->l_exp_refs_target = exp;
1116 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1117 lock, exp, lock->l_exp_refs_nr);
1118 spin_unlock(&exp->exp_locks_list_guard);
1121 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1123 spin_lock(&exp->exp_locks_list_guard);
1124 LASSERT(lock->l_exp_refs_nr > 0);
1125 if (lock->l_exp_refs_target != exp) {
1126 LCONSOLE_WARN("lock %p, "
1127 "mismatching export pointers: %p, %p\n",
1128 lock, lock->l_exp_refs_target, exp);
1130 if (-- lock->l_exp_refs_nr == 0) {
1131 list_del_init(&lock->l_exp_refs_link);
1132 lock->l_exp_refs_target = NULL;
1134 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1135 lock, exp, lock->l_exp_refs_nr);
1136 spin_unlock(&exp->exp_locks_list_guard);
1140 /* A connection defines an export context in which preallocation can
1141 be managed. This releases the export pointer reference, and returns
1142 the export handle, so the export refcount is 1 when this function
1144 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1145 struct obd_uuid *cluuid)
1147 struct obd_export *export;
1148 LASSERT(conn != NULL);
1149 LASSERT(obd != NULL);
1150 LASSERT(cluuid != NULL);
1153 export = class_new_export(obd, cluuid);
1155 RETURN(PTR_ERR(export));
1157 conn->cookie = export->exp_handle.h_cookie;
1158 class_export_put(export);
1160 CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1161 cluuid->uuid, conn->cookie);
1164 EXPORT_SYMBOL(class_connect);
1166 /* if export is involved in recovery then clean up related things */
1167 static void class_export_recovery_cleanup(struct obd_export *exp)
1169 struct obd_device *obd = exp->exp_obd;
1171 spin_lock(&obd->obd_recovery_task_lock);
1172 if (obd->obd_recovering) {
1173 if (exp->exp_in_recovery) {
1174 spin_lock(&exp->exp_lock);
1175 exp->exp_in_recovery = 0;
1176 spin_unlock(&exp->exp_lock);
1177 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1178 atomic_dec(&obd->obd_connected_clients);
1181 /* if called during recovery then should update
1182 * obd_stale_clients counter,
1183 * lightweight exports are not counted */
1184 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1185 exp->exp_obd->obd_stale_clients++;
1187 spin_unlock(&obd->obd_recovery_task_lock);
1189 spin_lock(&exp->exp_lock);
1190 /** Cleanup req replay fields */
1191 if (exp->exp_req_replay_needed) {
1192 exp->exp_req_replay_needed = 0;
1194 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1195 atomic_dec(&obd->obd_req_replay_clients);
1198 /** Cleanup lock replay data */
1199 if (exp->exp_lock_replay_needed) {
1200 exp->exp_lock_replay_needed = 0;
1202 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1203 atomic_dec(&obd->obd_lock_replay_clients);
1205 spin_unlock(&exp->exp_lock);
1208 /* This function removes 1-3 references from the export:
1209 * 1 - for export pointer passed
1210 * and if disconnect really need
1211 * 2 - removing from hash
1212 * 3 - in client_unlink_export
1213 * The export pointer passed to this function can destroyed */
1214 int class_disconnect(struct obd_export *export)
1216 int already_disconnected;
1219 if (export == NULL) {
1220 CWARN("attempting to free NULL export %p\n", export);
1224 spin_lock(&export->exp_lock);
1225 already_disconnected = export->exp_disconnected;
1226 export->exp_disconnected = 1;
1227 spin_unlock(&export->exp_lock);
1229 /* class_cleanup(), abort_recovery(), and class_fail_export()
1230 * all end up in here, and if any of them race we shouldn't
1231 * call extra class_export_puts(). */
1232 if (already_disconnected) {
1233 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1234 GOTO(no_disconn, already_disconnected);
1237 CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1238 export->exp_handle.h_cookie);
1240 if (!hlist_unhashed(&export->exp_nid_hash))
1241 cfs_hash_del(export->exp_obd->obd_nid_hash,
1242 &export->exp_connection->c_peer.nid,
1243 &export->exp_nid_hash);
1245 class_export_recovery_cleanup(export);
1246 class_unlink_export(export);
1248 class_export_put(export);
1251 EXPORT_SYMBOL(class_disconnect);
1253 /* Return non-zero for a fully connected export */
1254 int class_connected_export(struct obd_export *exp)
1259 spin_lock(&exp->exp_lock);
1260 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1261 spin_unlock(&exp->exp_lock);
1265 EXPORT_SYMBOL(class_connected_export);
1267 static void class_disconnect_export_list(struct list_head *list,
1268 enum obd_option flags)
1271 struct obd_export *exp;
1274 /* It's possible that an export may disconnect itself, but
1275 * nothing else will be added to this list. */
1276 while (!list_empty(list)) {
1277 exp = list_entry(list->next, struct obd_export,
1279 /* need for safe call CDEBUG after obd_disconnect */
1280 class_export_get(exp);
1282 spin_lock(&exp->exp_lock);
1283 exp->exp_flags = flags;
1284 spin_unlock(&exp->exp_lock);
1286 if (obd_uuid_equals(&exp->exp_client_uuid,
1287 &exp->exp_obd->obd_uuid)) {
1289 "exp %p export uuid == obd uuid, don't discon\n",
1291 /* Need to delete this now so we don't end up pointing
1292 * to work_list later when this export is cleaned up. */
1293 list_del_init(&exp->exp_obd_chain);
1294 class_export_put(exp);
1298 class_export_get(exp);
1299 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1300 "last request at "CFS_TIME_T"\n",
1301 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1302 exp, exp->exp_last_request_time);
1303 /* release one export reference anyway */
1304 rc = obd_disconnect(exp);
1306 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1307 obd_export_nid2str(exp), exp, rc);
1308 class_export_put(exp);
1313 void class_disconnect_exports(struct obd_device *obd)
1315 struct list_head work_list;
1318 /* Move all of the exports from obd_exports to a work list, en masse. */
1319 INIT_LIST_HEAD(&work_list);
1320 spin_lock(&obd->obd_dev_lock);
1321 list_splice_init(&obd->obd_exports, &work_list);
1322 list_splice_init(&obd->obd_delayed_exports, &work_list);
1323 spin_unlock(&obd->obd_dev_lock);
1325 if (!list_empty(&work_list)) {
1326 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1327 "disconnecting them\n", obd->obd_minor, obd);
1328 class_disconnect_export_list(&work_list,
1329 exp_flags_from_obd(obd));
1331 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1332 obd->obd_minor, obd);
1335 EXPORT_SYMBOL(class_disconnect_exports);
1337 /* Remove exports that have not completed recovery.
1339 void class_disconnect_stale_exports(struct obd_device *obd,
1340 int (*test_export)(struct obd_export *))
1342 struct list_head work_list;
1343 struct obd_export *exp, *n;
1347 INIT_LIST_HEAD(&work_list);
1348 spin_lock(&obd->obd_dev_lock);
1349 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1351 /* don't count self-export as client */
1352 if (obd_uuid_equals(&exp->exp_client_uuid,
1353 &exp->exp_obd->obd_uuid))
1356 /* don't evict clients which have no slot in last_rcvd
1357 * (e.g. lightweight connection) */
1358 if (exp->exp_target_data.ted_lr_idx == -1)
1361 spin_lock(&exp->exp_lock);
1362 if (exp->exp_failed || test_export(exp)) {
1363 spin_unlock(&exp->exp_lock);
1366 exp->exp_failed = 1;
1367 spin_unlock(&exp->exp_lock);
1369 list_move(&exp->exp_obd_chain, &work_list);
1371 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1372 obd->obd_name, exp->exp_client_uuid.uuid,
1373 exp->exp_connection == NULL ? "<unknown>" :
1374 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1375 print_export_data(exp, "EVICTING", 0);
1377 spin_unlock(&obd->obd_dev_lock);
1380 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1381 obd->obd_name, evicted);
1383 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1384 OBD_OPT_ABORT_RECOV);
1387 EXPORT_SYMBOL(class_disconnect_stale_exports);
1389 void class_fail_export(struct obd_export *exp)
1391 int rc, already_failed;
1393 spin_lock(&exp->exp_lock);
1394 already_failed = exp->exp_failed;
1395 exp->exp_failed = 1;
1396 spin_unlock(&exp->exp_lock);
1398 if (already_failed) {
1399 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1400 exp, exp->exp_client_uuid.uuid);
1404 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1405 exp, exp->exp_client_uuid.uuid);
1407 if (obd_dump_on_timeout)
1408 libcfs_debug_dumplog();
1410 /* need for safe call CDEBUG after obd_disconnect */
1411 class_export_get(exp);
1413 /* Most callers into obd_disconnect are removing their own reference
1414 * (request, for example) in addition to the one from the hash table.
1415 * We don't have such a reference here, so make one. */
1416 class_export_get(exp);
1417 rc = obd_disconnect(exp);
1419 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1421 CDEBUG(D_HA, "disconnected export %p/%s\n",
1422 exp, exp->exp_client_uuid.uuid);
1423 class_export_put(exp);
1425 EXPORT_SYMBOL(class_fail_export);
1427 char *obd_export_nid2str(struct obd_export *exp)
1429 if (exp->exp_connection != NULL)
1430 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1434 EXPORT_SYMBOL(obd_export_nid2str);
1436 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1438 struct cfs_hash *nid_hash;
1439 struct obd_export *doomed_exp = NULL;
1440 int exports_evicted = 0;
1442 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1444 spin_lock(&obd->obd_dev_lock);
1445 /* umount has run already, so evict thread should leave
1446 * its task to umount thread now */
1447 if (obd->obd_stopping) {
1448 spin_unlock(&obd->obd_dev_lock);
1449 return exports_evicted;
1451 nid_hash = obd->obd_nid_hash;
1452 cfs_hash_getref(nid_hash);
1453 spin_unlock(&obd->obd_dev_lock);
1456 doomed_exp = cfs_hash_lookup(nid_hash, &nid_key);
1457 if (doomed_exp == NULL)
1460 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1461 "nid %s found, wanted nid %s, requested nid %s\n",
1462 obd_export_nid2str(doomed_exp),
1463 libcfs_nid2str(nid_key), nid);
1464 LASSERTF(doomed_exp != obd->obd_self_export,
1465 "self-export is hashed by NID?\n");
1467 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative "
1468 "request\n", obd->obd_name,
1469 obd_uuid2str(&doomed_exp->exp_client_uuid),
1470 obd_export_nid2str(doomed_exp));
1471 class_fail_export(doomed_exp);
1472 class_export_put(doomed_exp);
1475 cfs_hash_putref(nid_hash);
1477 if (!exports_evicted)
1478 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1479 obd->obd_name, nid);
1480 return exports_evicted;
1482 EXPORT_SYMBOL(obd_export_evict_by_nid);
1484 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1486 struct cfs_hash *uuid_hash;
1487 struct obd_export *doomed_exp = NULL;
1488 struct obd_uuid doomed_uuid;
1489 int exports_evicted = 0;
1491 spin_lock(&obd->obd_dev_lock);
1492 if (obd->obd_stopping) {
1493 spin_unlock(&obd->obd_dev_lock);
1494 return exports_evicted;
1496 uuid_hash = obd->obd_uuid_hash;
1497 cfs_hash_getref(uuid_hash);
1498 spin_unlock(&obd->obd_dev_lock);
1500 obd_str2uuid(&doomed_uuid, uuid);
1501 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1502 CERROR("%s: can't evict myself\n", obd->obd_name);
1503 cfs_hash_putref(uuid_hash);
1504 return exports_evicted;
1507 doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid);
1509 if (doomed_exp == NULL) {
1510 CERROR("%s: can't disconnect %s: no exports found\n",
1511 obd->obd_name, uuid);
1513 CWARN("%s: evicting %s at adminstrative request\n",
1514 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1515 class_fail_export(doomed_exp);
1516 class_export_put(doomed_exp);
1519 cfs_hash_putref(uuid_hash);
1521 return exports_evicted;
1524 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1525 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1528 static void print_export_data(struct obd_export *exp, const char *status,
1531 struct ptlrpc_reply_state *rs;
1532 struct ptlrpc_reply_state *first_reply = NULL;
1535 spin_lock(&exp->exp_lock);
1536 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1542 spin_unlock(&exp->exp_lock);
1544 CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1545 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1546 obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1547 atomic_read(&exp->exp_rpc_count),
1548 atomic_read(&exp->exp_cb_count),
1549 atomic_read(&exp->exp_locks_count),
1550 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1551 nreplies, first_reply, nreplies > 3 ? "..." : "",
1552 exp->exp_last_committed);
1553 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1554 if (locks && class_export_dump_hook != NULL)
1555 class_export_dump_hook(exp);
1559 void dump_exports(struct obd_device *obd, int locks)
1561 struct obd_export *exp;
1563 spin_lock(&obd->obd_dev_lock);
1564 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1565 print_export_data(exp, "ACTIVE", locks);
1566 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1567 print_export_data(exp, "UNLINKED", locks);
1568 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1569 print_export_data(exp, "DELAYED", locks);
1570 spin_unlock(&obd->obd_dev_lock);
1571 spin_lock(&obd_zombie_impexp_lock);
1572 list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1573 print_export_data(exp, "ZOMBIE", locks);
1574 spin_unlock(&obd_zombie_impexp_lock);
1577 void obd_exports_barrier(struct obd_device *obd)
1580 LASSERT(list_empty(&obd->obd_exports));
1581 spin_lock(&obd->obd_dev_lock);
1582 while (!list_empty(&obd->obd_unlinked_exports)) {
1583 spin_unlock(&obd->obd_dev_lock);
1584 set_current_state(TASK_UNINTERRUPTIBLE);
1585 schedule_timeout(cfs_time_seconds(waited));
1586 if (waited > 5 && IS_PO2(waited)) {
1587 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1588 "more than %d seconds. "
1589 "The obd refcount = %d. Is it stuck?\n",
1590 obd->obd_name, waited,
1591 atomic_read(&obd->obd_refcount));
1592 dump_exports(obd, 1);
1595 spin_lock(&obd->obd_dev_lock);
1597 spin_unlock(&obd->obd_dev_lock);
1599 EXPORT_SYMBOL(obd_exports_barrier);
1601 /* Total amount of zombies to be destroyed */
1602 static int zombies_count = 0;
1605 * kill zombie imports and exports
1607 void obd_zombie_impexp_cull(void)
1609 struct obd_import *import;
1610 struct obd_export *export;
1614 spin_lock(&obd_zombie_impexp_lock);
1617 if (!list_empty(&obd_zombie_imports)) {
1618 import = list_entry(obd_zombie_imports.next,
1621 list_del_init(&import->imp_zombie_chain);
1625 if (!list_empty(&obd_zombie_exports)) {
1626 export = list_entry(obd_zombie_exports.next,
1629 list_del_init(&export->exp_obd_chain);
1632 spin_unlock(&obd_zombie_impexp_lock);
1634 if (import != NULL) {
1635 class_import_destroy(import);
1636 spin_lock(&obd_zombie_impexp_lock);
1638 spin_unlock(&obd_zombie_impexp_lock);
1641 if (export != NULL) {
1642 class_export_destroy(export);
1643 spin_lock(&obd_zombie_impexp_lock);
1645 spin_unlock(&obd_zombie_impexp_lock);
1649 } while (import != NULL || export != NULL);
1653 static struct completion obd_zombie_start;
1654 static struct completion obd_zombie_stop;
1655 static unsigned long obd_zombie_flags;
1656 static wait_queue_head_t obd_zombie_waitq;
1657 static pid_t obd_zombie_pid;
1660 OBD_ZOMBIE_STOP = 0x0001,
1664 * check for work for kill zombie import/export thread.
1666 static int obd_zombie_impexp_check(void *arg)
1670 spin_lock(&obd_zombie_impexp_lock);
1671 rc = (zombies_count == 0) &&
1672 !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1673 spin_unlock(&obd_zombie_impexp_lock);
1679 * Add export to the obd_zombe thread and notify it.
1681 static void obd_zombie_export_add(struct obd_export *exp) {
1682 atomic_dec(&obd_stale_export_num);
1683 spin_lock(&exp->exp_obd->obd_dev_lock);
1684 LASSERT(!list_empty(&exp->exp_obd_chain));
1685 list_del_init(&exp->exp_obd_chain);
1686 spin_unlock(&exp->exp_obd->obd_dev_lock);
1687 spin_lock(&obd_zombie_impexp_lock);
1689 list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1690 spin_unlock(&obd_zombie_impexp_lock);
1692 obd_zombie_impexp_notify();
1696 * Add import to the obd_zombe thread and notify it.
1698 static void obd_zombie_import_add(struct obd_import *imp) {
1699 LASSERT(imp->imp_sec == NULL);
1700 spin_lock(&obd_zombie_impexp_lock);
1701 LASSERT(list_empty(&imp->imp_zombie_chain));
1703 list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1704 spin_unlock(&obd_zombie_impexp_lock);
1706 obd_zombie_impexp_notify();
1710 * notify import/export destroy thread about new zombie.
1712 static void obd_zombie_impexp_notify(void)
1715 * Make sure obd_zomebie_impexp_thread get this notification.
1716 * It is possible this signal only get by obd_zombie_barrier, and
1717 * barrier gulps this notification and sleeps away and hangs ensues
1719 wake_up_all(&obd_zombie_waitq);
1723 * check whether obd_zombie is idle
1725 static int obd_zombie_is_idle(void)
1729 LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1730 spin_lock(&obd_zombie_impexp_lock);
1731 rc = (zombies_count == 0);
1732 spin_unlock(&obd_zombie_impexp_lock);
1737 * wait when obd_zombie import/export queues become empty
1739 void obd_zombie_barrier(void)
1741 struct l_wait_info lwi = { 0 };
1743 if (obd_zombie_pid == current_pid())
1744 /* don't wait for myself */
1746 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1748 EXPORT_SYMBOL(obd_zombie_barrier);
1751 struct obd_export *obd_stale_export_get(void)
1753 struct obd_export *exp = NULL;
1756 spin_lock(&obd_stale_export_lock);
1757 if (!list_empty(&obd_stale_exports)) {
1758 exp = list_entry(obd_stale_exports.next,
1759 struct obd_export, exp_stale_list);
1760 list_del_init(&exp->exp_stale_list);
1762 spin_unlock(&obd_stale_export_lock);
1765 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1766 atomic_read(&obd_stale_export_num));
1770 EXPORT_SYMBOL(obd_stale_export_get);
1772 void obd_stale_export_put(struct obd_export *exp)
1776 LASSERT(list_empty(&exp->exp_stale_list));
1777 if (exp->exp_lock_hash &&
1778 atomic_read(&exp->exp_lock_hash->hs_count)) {
1779 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1780 atomic_read(&obd_stale_export_num));
1782 spin_lock_bh(&exp->exp_bl_list_lock);
1783 spin_lock(&obd_stale_export_lock);
1784 /* Add to the tail if there is no blocked locks,
1785 * to the head otherwise. */
1786 if (list_empty(&exp->exp_bl_list))
1787 list_add_tail(&exp->exp_stale_list,
1788 &obd_stale_exports);
1790 list_add(&exp->exp_stale_list,
1791 &obd_stale_exports);
1793 spin_unlock(&obd_stale_export_lock);
1794 spin_unlock_bh(&exp->exp_bl_list_lock);
1796 class_export_put(exp);
1800 EXPORT_SYMBOL(obd_stale_export_put);
1803 * Adjust the position of the export in the stale list,
1804 * i.e. move to the head of the list if is needed.
1806 void obd_stale_export_adjust(struct obd_export *exp)
1808 LASSERT(exp != NULL);
1809 spin_lock_bh(&exp->exp_bl_list_lock);
1810 spin_lock(&obd_stale_export_lock);
1812 if (!list_empty(&exp->exp_stale_list) &&
1813 !list_empty(&exp->exp_bl_list))
1814 list_move(&exp->exp_stale_list, &obd_stale_exports);
1816 spin_unlock(&obd_stale_export_lock);
1817 spin_unlock_bh(&exp->exp_bl_list_lock);
1819 EXPORT_SYMBOL(obd_stale_export_adjust);
1822 * destroy zombie export/import thread.
1824 static int obd_zombie_impexp_thread(void *unused)
1826 unshare_fs_struct();
1827 complete(&obd_zombie_start);
1829 obd_zombie_pid = current_pid();
1831 while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1832 struct l_wait_info lwi = { 0 };
1834 l_wait_event(obd_zombie_waitq,
1835 !obd_zombie_impexp_check(NULL), &lwi);
1836 obd_zombie_impexp_cull();
1839 * Notify obd_zombie_barrier callers that queues
1842 wake_up(&obd_zombie_waitq);
1845 complete(&obd_zombie_stop);
1852 * start destroy zombie import/export thread
1854 int obd_zombie_impexp_init(void)
1856 struct task_struct *task;
1858 INIT_LIST_HEAD(&obd_zombie_imports);
1860 INIT_LIST_HEAD(&obd_zombie_exports);
1861 spin_lock_init(&obd_zombie_impexp_lock);
1862 init_completion(&obd_zombie_start);
1863 init_completion(&obd_zombie_stop);
1864 init_waitqueue_head(&obd_zombie_waitq);
1867 task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
1869 RETURN(PTR_ERR(task));
1871 wait_for_completion(&obd_zombie_start);
1875 * stop destroy zombie import/export thread
1877 void obd_zombie_impexp_stop(void)
1879 set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1880 obd_zombie_impexp_notify();
1881 wait_for_completion(&obd_zombie_stop);
1884 /***** Kernel-userspace comm helpers *******/
1886 /* Get length of entire message, including header */
1887 int kuc_len(int payload_len)
1889 return sizeof(struct kuc_hdr) + payload_len;
1891 EXPORT_SYMBOL(kuc_len);
1893 /* Get a pointer to kuc header, given a ptr to the payload
1894 * @param p Pointer to payload area
1895 * @returns Pointer to kuc header
1897 struct kuc_hdr * kuc_ptr(void *p)
1899 struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
1900 LASSERT(lh->kuc_magic == KUC_MAGIC);
1903 EXPORT_SYMBOL(kuc_ptr);
1905 /* Test if payload is part of kuc message
1906 * @param p Pointer to payload area
1909 int kuc_ispayload(void *p)
1911 struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1;
1913 if (kh->kuc_magic == KUC_MAGIC)
1918 EXPORT_SYMBOL(kuc_ispayload);
1920 /* Alloc space for a message, and fill in header
1921 * @return Pointer to payload area
1923 void *kuc_alloc(int payload_len, int transport, int type)
1926 int len = kuc_len(payload_len);
1930 return ERR_PTR(-ENOMEM);
1932 lh->kuc_magic = KUC_MAGIC;
1933 lh->kuc_transport = transport;
1934 lh->kuc_msgtype = type;
1935 lh->kuc_msglen = len;
1937 return (void *)(lh + 1);
1939 EXPORT_SYMBOL(kuc_alloc);
1941 /* Takes pointer to payload area */
1942 inline void kuc_free(void *p, int payload_len)
1944 struct kuc_hdr *lh = kuc_ptr(p);
1945 OBD_FREE(lh, kuc_len(payload_len));
1947 EXPORT_SYMBOL(kuc_free);
1949 struct obd_request_slot_waiter {
1950 struct list_head orsw_entry;
1951 wait_queue_head_t orsw_waitq;
1955 static bool obd_request_slot_avail(struct client_obd *cli,
1956 struct obd_request_slot_waiter *orsw)
1960 spin_lock(&cli->cl_loi_list_lock);
1961 avail = !!list_empty(&orsw->orsw_entry);
1962 spin_unlock(&cli->cl_loi_list_lock);
1968 * For network flow control, the RPC sponsor needs to acquire a credit
1969 * before sending the RPC. The credits count for a connection is defined
1970 * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
1971 * the subsequent RPC sponsors need to wait until others released their
1972 * credits, or the administrator increased the "cl_max_rpcs_in_flight".
1974 int obd_get_request_slot(struct client_obd *cli)
1976 struct obd_request_slot_waiter orsw;
1977 struct l_wait_info lwi;
1980 spin_lock(&cli->cl_loi_list_lock);
1981 if (cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight) {
1982 cli->cl_r_in_flight++;
1983 spin_unlock(&cli->cl_loi_list_lock);
1987 init_waitqueue_head(&orsw.orsw_waitq);
1988 list_add_tail(&orsw.orsw_entry, &cli->cl_loi_read_list);
1989 orsw.orsw_signaled = false;
1990 spin_unlock(&cli->cl_loi_list_lock);
1992 lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1993 rc = l_wait_event(orsw.orsw_waitq,
1994 obd_request_slot_avail(cli, &orsw) ||
1998 /* Here, we must take the lock to avoid the on-stack 'orsw' to be
1999 * freed but other (such as obd_put_request_slot) is using it. */
2000 spin_lock(&cli->cl_loi_list_lock);
2002 if (!orsw.orsw_signaled) {
2003 if (list_empty(&orsw.orsw_entry))
2004 cli->cl_r_in_flight--;
2006 list_del(&orsw.orsw_entry);
2010 if (orsw.orsw_signaled) {
2011 LASSERT(list_empty(&orsw.orsw_entry));
2015 spin_unlock(&cli->cl_loi_list_lock);
2019 EXPORT_SYMBOL(obd_get_request_slot);
2021 void obd_put_request_slot(struct client_obd *cli)
2023 struct obd_request_slot_waiter *orsw;
2025 spin_lock(&cli->cl_loi_list_lock);
2026 cli->cl_r_in_flight--;
2028 /* If there is free slot, wakeup the first waiter. */
2029 if (!list_empty(&cli->cl_loi_read_list) &&
2030 likely(cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight)) {
2031 orsw = list_entry(cli->cl_loi_read_list.next,
2032 struct obd_request_slot_waiter, orsw_entry);
2033 list_del_init(&orsw->orsw_entry);
2034 cli->cl_r_in_flight++;
2035 wake_up(&orsw->orsw_waitq);
2037 spin_unlock(&cli->cl_loi_list_lock);
2039 EXPORT_SYMBOL(obd_put_request_slot);
2041 __u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
2043 return cli->cl_max_rpcs_in_flight;
2045 EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
2047 int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
2049 struct obd_request_slot_waiter *orsw;
2056 if (max > OBD_MAX_RIF_MAX || max < 1)
2059 typ_name = cli->cl_import->imp_obd->obd_type->typ_name;
2060 if (strcmp(typ_name, LUSTRE_MDC_NAME) == 0) {
2061 /* adjust max_mod_rpcs_in_flight to ensure it is always
2062 * strictly lower that max_rpcs_in_flight */
2064 CERROR("%s: cannot set max_rpcs_in_flight to 1 "
2065 "because it must be higher than "
2066 "max_mod_rpcs_in_flight value",
2067 cli->cl_import->imp_obd->obd_name);
2070 if (max <= cli->cl_max_mod_rpcs_in_flight) {
2071 rc = obd_set_max_mod_rpcs_in_flight(cli, max - 1);
2077 spin_lock(&cli->cl_loi_list_lock);
2078 old = cli->cl_max_rpcs_in_flight;
2079 cli->cl_max_rpcs_in_flight = max;
2082 /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
2083 for (i = 0; i < diff; i++) {
2084 if (list_empty(&cli->cl_loi_read_list))
2087 orsw = list_entry(cli->cl_loi_read_list.next,
2088 struct obd_request_slot_waiter, orsw_entry);
2089 list_del_init(&orsw->orsw_entry);
2090 cli->cl_r_in_flight++;
2091 wake_up(&orsw->orsw_waitq);
2093 spin_unlock(&cli->cl_loi_list_lock);
2097 EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
2099 __u16 obd_get_max_mod_rpcs_in_flight(struct client_obd *cli)
2101 return cli->cl_max_mod_rpcs_in_flight;
2103 EXPORT_SYMBOL(obd_get_max_mod_rpcs_in_flight);
2105 int obd_set_max_mod_rpcs_in_flight(struct client_obd *cli, __u16 max)
2107 struct obd_connect_data *ocd;
2111 if (max > OBD_MAX_RIF_MAX || max < 1)
2114 /* cannot exceed or equal max_rpcs_in_flight */
2115 if (max >= cli->cl_max_rpcs_in_flight) {
2116 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2117 "higher or equal to max_rpcs_in_flight value (%u)\n",
2118 cli->cl_import->imp_obd->obd_name,
2119 max, cli->cl_max_rpcs_in_flight);
2123 /* cannot exceed max modify RPCs in flight supported by the server */
2124 ocd = &cli->cl_import->imp_connect_data;
2125 if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS)
2126 maxmodrpcs = ocd->ocd_maxmodrpcs;
2129 if (max > maxmodrpcs) {
2130 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2131 "higher than max_mod_rpcs_per_client value (%hu) "
2132 "returned by the server at connection\n",
2133 cli->cl_import->imp_obd->obd_name,
2138 spin_lock(&cli->cl_mod_rpcs_lock);
2140 prev = cli->cl_max_mod_rpcs_in_flight;
2141 cli->cl_max_mod_rpcs_in_flight = max;
2143 /* wakeup waiters if limit has been increased */
2144 if (cli->cl_max_mod_rpcs_in_flight > prev)
2145 wake_up(&cli->cl_mod_rpcs_waitq);
2147 spin_unlock(&cli->cl_mod_rpcs_lock);
2151 EXPORT_SYMBOL(obd_set_max_mod_rpcs_in_flight);
2154 #define pct(a, b) (b ? a * 100 / b : 0)
2155 int obd_mod_rpc_stats_seq_show(struct client_obd *cli,
2156 struct seq_file *seq)
2159 unsigned long mod_tot = 0, mod_cum;
2162 do_gettimeofday(&now);
2164 spin_lock(&cli->cl_mod_rpcs_lock);
2166 seq_printf(seq, "snapshot_time: %lu.%lu (secs.usecs)\n",
2167 now.tv_sec, now.tv_usec);
2168 seq_printf(seq, "modify_RPCs_in_flight: %hu\n",
2169 cli->cl_mod_rpcs_in_flight);
2171 seq_printf(seq, "\n\t\t\tmodify\n");
2172 seq_printf(seq, "rpcs in flight rpcs %% cum %%\n");
2174 mod_tot = lprocfs_oh_sum(&cli->cl_mod_rpcs_hist);
2177 for (i = 0; i < OBD_HIST_MAX; i++) {
2178 unsigned long mod = cli->cl_mod_rpcs_hist.oh_buckets[i];
2180 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu\n",
2181 i, mod, pct(mod, mod_tot),
2182 pct(mod_cum, mod_tot));
2183 if (mod_cum == mod_tot)
2187 spin_unlock(&cli->cl_mod_rpcs_lock);
2191 EXPORT_SYMBOL(obd_mod_rpc_stats_seq_show);
2195 /* The number of modify RPCs sent in parallel is limited
2196 * because the server has a finite number of slots per client to
2197 * store request result and ensure reply reconstruction when needed.
2198 * On the client, this limit is stored in cl_max_mod_rpcs_in_flight
2199 * that takes into account server limit and cl_max_rpcs_in_flight
2201 * On the MDC client, to avoid a potential deadlock (see Bugzilla 3462),
2202 * one close request is allowed above the maximum.
2204 static inline bool obd_mod_rpc_slot_avail_locked(struct client_obd *cli,
2209 /* A slot is available if
2210 * - number of modify RPCs in flight is less than the max
2211 * - it's a close RPC and no other close request is in flight
2213 avail = cli->cl_mod_rpcs_in_flight < cli->cl_max_mod_rpcs_in_flight ||
2214 (close_req && cli->cl_close_rpcs_in_flight == 0);
2219 static inline bool obd_mod_rpc_slot_avail(struct client_obd *cli,
2224 spin_lock(&cli->cl_mod_rpcs_lock);
2225 avail = obd_mod_rpc_slot_avail_locked(cli, close_req);
2226 spin_unlock(&cli->cl_mod_rpcs_lock);
2230 /* Get a modify RPC slot from the obd client @cli according
2231 * to the kind of operation @opc that is going to be sent
2232 * and the intent @it of the operation if it applies.
2233 * If the maximum number of modify RPCs in flight is reached
2234 * the thread is put to sleep.
2235 * Returns the tag to be set in the request message. Tag 0
2236 * is reserved for non-modifying requests.
2238 __u16 obd_get_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2239 struct lookup_intent *it)
2241 struct l_wait_info lwi = LWI_INTR(NULL, NULL);
2242 bool close_req = false;
2245 /* read-only metadata RPCs don't consume a slot on MDT
2246 * for reply reconstruction
2248 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2249 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2252 if (opc == MDS_CLOSE)
2256 spin_lock(&cli->cl_mod_rpcs_lock);
2257 max = cli->cl_max_mod_rpcs_in_flight;
2258 if (obd_mod_rpc_slot_avail_locked(cli, close_req)) {
2259 /* there is a slot available */
2260 cli->cl_mod_rpcs_in_flight++;
2262 cli->cl_close_rpcs_in_flight++;
2263 lprocfs_oh_tally(&cli->cl_mod_rpcs_hist,
2264 cli->cl_mod_rpcs_in_flight);
2265 /* find a free tag */
2266 i = find_first_zero_bit(cli->cl_mod_tag_bitmap,
2268 LASSERT(i < OBD_MAX_RIF_MAX);
2269 LASSERT(!test_and_set_bit(i, cli->cl_mod_tag_bitmap));
2270 spin_unlock(&cli->cl_mod_rpcs_lock);
2271 /* tag 0 is reserved for non-modify RPCs */
2274 spin_unlock(&cli->cl_mod_rpcs_lock);
2276 CDEBUG(D_RPCTRACE, "%s: sleeping for a modify RPC slot "
2277 "opc %u, max %hu\n",
2278 cli->cl_import->imp_obd->obd_name, opc, max);
2280 l_wait_event(cli->cl_mod_rpcs_waitq,
2281 obd_mod_rpc_slot_avail(cli, close_req), &lwi);
2284 EXPORT_SYMBOL(obd_get_mod_rpc_slot);
2286 /* Put a modify RPC slot from the obd client @cli according
2287 * to the kind of operation @opc that has been sent and the
2288 * intent @it of the operation if it applies.
2290 void obd_put_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2291 struct lookup_intent *it, __u16 tag)
2293 bool close_req = false;
2295 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2296 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2299 if (opc == MDS_CLOSE)
2302 spin_lock(&cli->cl_mod_rpcs_lock);
2303 cli->cl_mod_rpcs_in_flight--;
2305 cli->cl_close_rpcs_in_flight--;
2306 /* release the tag in the bitmap */
2307 LASSERT(tag - 1 < OBD_MAX_RIF_MAX);
2308 LASSERT(test_and_clear_bit(tag - 1, cli->cl_mod_tag_bitmap) != 0);
2309 spin_unlock(&cli->cl_mod_rpcs_lock);
2310 wake_up(&cli->cl_mod_rpcs_waitq);
2312 EXPORT_SYMBOL(obd_put_mod_rpc_slot);