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, 2015, 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 /* Because obd_gen_hash will not be released until
948 * class_cleanup(), so hash should never be NULL here */
949 hash = cfs_hash_getref(exp->exp_obd->obd_gen_hash);
950 LASSERT(hash != NULL);
951 cfs_hash_del(hash, &ted->ted_lcd->lcd_generation,
953 cfs_hash_putref(hash);
956 list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
957 list_del_init(&exp->exp_obd_chain_timed);
958 exp->exp_obd->obd_num_exports--;
959 spin_unlock(&exp->exp_obd->obd_dev_lock);
960 atomic_inc(&obd_stale_export_num);
962 /* A reference is kept by obd_stale_exports list */
963 obd_stale_export_put(exp);
965 EXPORT_SYMBOL(class_unlink_export);
967 /* Import management functions */
968 static void class_import_destroy(struct obd_import *imp)
972 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
973 imp->imp_obd->obd_name);
975 LASSERT_ATOMIC_ZERO(&imp->imp_refcount);
977 ptlrpc_put_connection_superhack(imp->imp_connection);
979 while (!list_empty(&imp->imp_conn_list)) {
980 struct obd_import_conn *imp_conn;
982 imp_conn = list_entry(imp->imp_conn_list.next,
983 struct obd_import_conn, oic_item);
984 list_del_init(&imp_conn->oic_item);
985 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
986 OBD_FREE(imp_conn, sizeof(*imp_conn));
989 LASSERT(imp->imp_sec == NULL);
990 class_decref(imp->imp_obd, "import", imp);
991 OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
995 static void import_handle_addref(void *import)
997 class_import_get(import);
1000 static struct portals_handle_ops import_handle_ops = {
1001 .hop_addref = import_handle_addref,
1005 struct obd_import *class_import_get(struct obd_import *import)
1007 atomic_inc(&import->imp_refcount);
1008 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
1009 atomic_read(&import->imp_refcount),
1010 import->imp_obd->obd_name);
1013 EXPORT_SYMBOL(class_import_get);
1015 void class_import_put(struct obd_import *imp)
1019 LASSERT(list_empty(&imp->imp_zombie_chain));
1020 LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON);
1022 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
1023 atomic_read(&imp->imp_refcount) - 1,
1024 imp->imp_obd->obd_name);
1026 if (atomic_dec_and_test(&imp->imp_refcount)) {
1027 CDEBUG(D_INFO, "final put import %p\n", imp);
1028 obd_zombie_import_add(imp);
1031 /* catch possible import put race */
1032 LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON);
1035 EXPORT_SYMBOL(class_import_put);
1037 static void init_imp_at(struct imp_at *at) {
1039 at_init(&at->iat_net_latency, 0, 0);
1040 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1041 /* max service estimates are tracked on the server side, so
1042 don't use the AT history here, just use the last reported
1043 val. (But keep hist for proc histogram, worst_ever) */
1044 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
1049 struct obd_import *class_new_import(struct obd_device *obd)
1051 struct obd_import *imp;
1053 OBD_ALLOC(imp, sizeof(*imp));
1057 INIT_LIST_HEAD(&imp->imp_pinger_chain);
1058 INIT_LIST_HEAD(&imp->imp_zombie_chain);
1059 INIT_LIST_HEAD(&imp->imp_replay_list);
1060 INIT_LIST_HEAD(&imp->imp_sending_list);
1061 INIT_LIST_HEAD(&imp->imp_delayed_list);
1062 INIT_LIST_HEAD(&imp->imp_committed_list);
1063 INIT_LIST_HEAD(&imp->imp_unreplied_list);
1064 imp->imp_known_replied_xid = 0;
1065 imp->imp_replay_cursor = &imp->imp_committed_list;
1066 spin_lock_init(&imp->imp_lock);
1067 imp->imp_last_success_conn = 0;
1068 imp->imp_state = LUSTRE_IMP_NEW;
1069 imp->imp_obd = class_incref(obd, "import", imp);
1070 mutex_init(&imp->imp_sec_mutex);
1071 init_waitqueue_head(&imp->imp_recovery_waitq);
1073 atomic_set(&imp->imp_refcount, 2);
1074 atomic_set(&imp->imp_unregistering, 0);
1075 atomic_set(&imp->imp_inflight, 0);
1076 atomic_set(&imp->imp_replay_inflight, 0);
1077 atomic_set(&imp->imp_inval_count, 0);
1078 INIT_LIST_HEAD(&imp->imp_conn_list);
1079 INIT_LIST_HEAD(&imp->imp_handle.h_link);
1080 class_handle_hash(&imp->imp_handle, &import_handle_ops);
1081 init_imp_at(&imp->imp_at);
1083 /* the default magic is V2, will be used in connect RPC, and
1084 * then adjusted according to the flags in request/reply. */
1085 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
1089 EXPORT_SYMBOL(class_new_import);
1091 void class_destroy_import(struct obd_import *import)
1093 LASSERT(import != NULL);
1094 LASSERT(import != LP_POISON);
1096 class_handle_unhash(&import->imp_handle);
1098 spin_lock(&import->imp_lock);
1099 import->imp_generation++;
1100 spin_unlock(&import->imp_lock);
1101 class_import_put(import);
1103 EXPORT_SYMBOL(class_destroy_import);
1105 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1107 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1109 spin_lock(&exp->exp_locks_list_guard);
1111 LASSERT(lock->l_exp_refs_nr >= 0);
1113 if (lock->l_exp_refs_target != NULL &&
1114 lock->l_exp_refs_target != exp) {
1115 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1116 exp, lock, lock->l_exp_refs_target);
1118 if ((lock->l_exp_refs_nr ++) == 0) {
1119 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1120 lock->l_exp_refs_target = exp;
1122 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1123 lock, exp, lock->l_exp_refs_nr);
1124 spin_unlock(&exp->exp_locks_list_guard);
1127 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1129 spin_lock(&exp->exp_locks_list_guard);
1130 LASSERT(lock->l_exp_refs_nr > 0);
1131 if (lock->l_exp_refs_target != exp) {
1132 LCONSOLE_WARN("lock %p, "
1133 "mismatching export pointers: %p, %p\n",
1134 lock, lock->l_exp_refs_target, exp);
1136 if (-- lock->l_exp_refs_nr == 0) {
1137 list_del_init(&lock->l_exp_refs_link);
1138 lock->l_exp_refs_target = NULL;
1140 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1141 lock, exp, lock->l_exp_refs_nr);
1142 spin_unlock(&exp->exp_locks_list_guard);
1146 /* A connection defines an export context in which preallocation can
1147 be managed. This releases the export pointer reference, and returns
1148 the export handle, so the export refcount is 1 when this function
1150 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1151 struct obd_uuid *cluuid)
1153 struct obd_export *export;
1154 LASSERT(conn != NULL);
1155 LASSERT(obd != NULL);
1156 LASSERT(cluuid != NULL);
1159 export = class_new_export(obd, cluuid);
1161 RETURN(PTR_ERR(export));
1163 conn->cookie = export->exp_handle.h_cookie;
1164 class_export_put(export);
1166 CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1167 cluuid->uuid, conn->cookie);
1170 EXPORT_SYMBOL(class_connect);
1172 /* if export is involved in recovery then clean up related things */
1173 static void class_export_recovery_cleanup(struct obd_export *exp)
1175 struct obd_device *obd = exp->exp_obd;
1177 spin_lock(&obd->obd_recovery_task_lock);
1178 if (obd->obd_recovering) {
1179 if (exp->exp_in_recovery) {
1180 spin_lock(&exp->exp_lock);
1181 exp->exp_in_recovery = 0;
1182 spin_unlock(&exp->exp_lock);
1183 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1184 atomic_dec(&obd->obd_connected_clients);
1187 /* if called during recovery then should update
1188 * obd_stale_clients counter,
1189 * lightweight exports are not counted */
1190 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1191 exp->exp_obd->obd_stale_clients++;
1193 spin_unlock(&obd->obd_recovery_task_lock);
1195 spin_lock(&exp->exp_lock);
1196 /** Cleanup req replay fields */
1197 if (exp->exp_req_replay_needed) {
1198 exp->exp_req_replay_needed = 0;
1200 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1201 atomic_dec(&obd->obd_req_replay_clients);
1204 /** Cleanup lock replay data */
1205 if (exp->exp_lock_replay_needed) {
1206 exp->exp_lock_replay_needed = 0;
1208 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1209 atomic_dec(&obd->obd_lock_replay_clients);
1211 spin_unlock(&exp->exp_lock);
1214 /* This function removes 1-3 references from the export:
1215 * 1 - for export pointer passed
1216 * and if disconnect really need
1217 * 2 - removing from hash
1218 * 3 - in client_unlink_export
1219 * The export pointer passed to this function can destroyed */
1220 int class_disconnect(struct obd_export *export)
1222 int already_disconnected;
1225 if (export == NULL) {
1226 CWARN("attempting to free NULL export %p\n", export);
1230 spin_lock(&export->exp_lock);
1231 already_disconnected = export->exp_disconnected;
1232 export->exp_disconnected = 1;
1233 spin_unlock(&export->exp_lock);
1235 /* class_cleanup(), abort_recovery(), and class_fail_export()
1236 * all end up in here, and if any of them race we shouldn't
1237 * call extra class_export_puts(). */
1238 if (already_disconnected) {
1239 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1240 GOTO(no_disconn, already_disconnected);
1243 CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1244 export->exp_handle.h_cookie);
1246 if (!hlist_unhashed(&export->exp_nid_hash))
1247 cfs_hash_del(export->exp_obd->obd_nid_hash,
1248 &export->exp_connection->c_peer.nid,
1249 &export->exp_nid_hash);
1251 class_export_recovery_cleanup(export);
1252 class_unlink_export(export);
1254 class_export_put(export);
1257 EXPORT_SYMBOL(class_disconnect);
1259 /* Return non-zero for a fully connected export */
1260 int class_connected_export(struct obd_export *exp)
1265 spin_lock(&exp->exp_lock);
1266 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1267 spin_unlock(&exp->exp_lock);
1271 EXPORT_SYMBOL(class_connected_export);
1273 static void class_disconnect_export_list(struct list_head *list,
1274 enum obd_option flags)
1277 struct obd_export *exp;
1280 /* It's possible that an export may disconnect itself, but
1281 * nothing else will be added to this list. */
1282 while (!list_empty(list)) {
1283 exp = list_entry(list->next, struct obd_export,
1285 /* need for safe call CDEBUG after obd_disconnect */
1286 class_export_get(exp);
1288 spin_lock(&exp->exp_lock);
1289 exp->exp_flags = flags;
1290 spin_unlock(&exp->exp_lock);
1292 if (obd_uuid_equals(&exp->exp_client_uuid,
1293 &exp->exp_obd->obd_uuid)) {
1295 "exp %p export uuid == obd uuid, don't discon\n",
1297 /* Need to delete this now so we don't end up pointing
1298 * to work_list later when this export is cleaned up. */
1299 list_del_init(&exp->exp_obd_chain);
1300 class_export_put(exp);
1304 class_export_get(exp);
1305 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1306 "last request at "CFS_TIME_T"\n",
1307 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1308 exp, exp->exp_last_request_time);
1309 /* release one export reference anyway */
1310 rc = obd_disconnect(exp);
1312 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1313 obd_export_nid2str(exp), exp, rc);
1314 class_export_put(exp);
1319 void class_disconnect_exports(struct obd_device *obd)
1321 struct list_head work_list;
1324 /* Move all of the exports from obd_exports to a work list, en masse. */
1325 INIT_LIST_HEAD(&work_list);
1326 spin_lock(&obd->obd_dev_lock);
1327 list_splice_init(&obd->obd_exports, &work_list);
1328 list_splice_init(&obd->obd_delayed_exports, &work_list);
1329 spin_unlock(&obd->obd_dev_lock);
1331 if (!list_empty(&work_list)) {
1332 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1333 "disconnecting them\n", obd->obd_minor, obd);
1334 class_disconnect_export_list(&work_list,
1335 exp_flags_from_obd(obd));
1337 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1338 obd->obd_minor, obd);
1341 EXPORT_SYMBOL(class_disconnect_exports);
1343 /* Remove exports that have not completed recovery.
1345 void class_disconnect_stale_exports(struct obd_device *obd,
1346 int (*test_export)(struct obd_export *))
1348 struct list_head work_list;
1349 struct obd_export *exp, *n;
1353 INIT_LIST_HEAD(&work_list);
1354 spin_lock(&obd->obd_dev_lock);
1355 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1357 /* don't count self-export as client */
1358 if (obd_uuid_equals(&exp->exp_client_uuid,
1359 &exp->exp_obd->obd_uuid))
1362 /* don't evict clients which have no slot in last_rcvd
1363 * (e.g. lightweight connection) */
1364 if (exp->exp_target_data.ted_lr_idx == -1)
1367 spin_lock(&exp->exp_lock);
1368 if (exp->exp_failed || test_export(exp)) {
1369 spin_unlock(&exp->exp_lock);
1372 exp->exp_failed = 1;
1373 spin_unlock(&exp->exp_lock);
1375 list_move(&exp->exp_obd_chain, &work_list);
1377 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1378 obd->obd_name, exp->exp_client_uuid.uuid,
1379 exp->exp_connection == NULL ? "<unknown>" :
1380 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1381 print_export_data(exp, "EVICTING", 0);
1383 spin_unlock(&obd->obd_dev_lock);
1386 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1387 obd->obd_name, evicted);
1389 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1390 OBD_OPT_ABORT_RECOV);
1393 EXPORT_SYMBOL(class_disconnect_stale_exports);
1395 void class_fail_export(struct obd_export *exp)
1397 int rc, already_failed;
1399 spin_lock(&exp->exp_lock);
1400 already_failed = exp->exp_failed;
1401 exp->exp_failed = 1;
1402 spin_unlock(&exp->exp_lock);
1404 if (already_failed) {
1405 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1406 exp, exp->exp_client_uuid.uuid);
1410 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1411 exp, exp->exp_client_uuid.uuid);
1413 if (obd_dump_on_timeout)
1414 libcfs_debug_dumplog();
1416 /* need for safe call CDEBUG after obd_disconnect */
1417 class_export_get(exp);
1419 /* Most callers into obd_disconnect are removing their own reference
1420 * (request, for example) in addition to the one from the hash table.
1421 * We don't have such a reference here, so make one. */
1422 class_export_get(exp);
1423 rc = obd_disconnect(exp);
1425 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1427 CDEBUG(D_HA, "disconnected export %p/%s\n",
1428 exp, exp->exp_client_uuid.uuid);
1429 class_export_put(exp);
1431 EXPORT_SYMBOL(class_fail_export);
1433 char *obd_export_nid2str(struct obd_export *exp)
1435 if (exp->exp_connection != NULL)
1436 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1440 EXPORT_SYMBOL(obd_export_nid2str);
1442 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1444 struct cfs_hash *nid_hash;
1445 struct obd_export *doomed_exp = NULL;
1446 int exports_evicted = 0;
1448 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1450 spin_lock(&obd->obd_dev_lock);
1451 /* umount has run already, so evict thread should leave
1452 * its task to umount thread now */
1453 if (obd->obd_stopping) {
1454 spin_unlock(&obd->obd_dev_lock);
1455 return exports_evicted;
1457 nid_hash = obd->obd_nid_hash;
1458 cfs_hash_getref(nid_hash);
1459 spin_unlock(&obd->obd_dev_lock);
1462 doomed_exp = cfs_hash_lookup(nid_hash, &nid_key);
1463 if (doomed_exp == NULL)
1466 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1467 "nid %s found, wanted nid %s, requested nid %s\n",
1468 obd_export_nid2str(doomed_exp),
1469 libcfs_nid2str(nid_key), nid);
1470 LASSERTF(doomed_exp != obd->obd_self_export,
1471 "self-export is hashed by NID?\n");
1473 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative "
1474 "request\n", obd->obd_name,
1475 obd_uuid2str(&doomed_exp->exp_client_uuid),
1476 obd_export_nid2str(doomed_exp));
1477 class_fail_export(doomed_exp);
1478 class_export_put(doomed_exp);
1481 cfs_hash_putref(nid_hash);
1483 if (!exports_evicted)
1484 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1485 obd->obd_name, nid);
1486 return exports_evicted;
1488 EXPORT_SYMBOL(obd_export_evict_by_nid);
1490 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1492 struct cfs_hash *uuid_hash;
1493 struct obd_export *doomed_exp = NULL;
1494 struct obd_uuid doomed_uuid;
1495 int exports_evicted = 0;
1497 spin_lock(&obd->obd_dev_lock);
1498 if (obd->obd_stopping) {
1499 spin_unlock(&obd->obd_dev_lock);
1500 return exports_evicted;
1502 uuid_hash = obd->obd_uuid_hash;
1503 cfs_hash_getref(uuid_hash);
1504 spin_unlock(&obd->obd_dev_lock);
1506 obd_str2uuid(&doomed_uuid, uuid);
1507 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1508 CERROR("%s: can't evict myself\n", obd->obd_name);
1509 cfs_hash_putref(uuid_hash);
1510 return exports_evicted;
1513 doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid);
1515 if (doomed_exp == NULL) {
1516 CERROR("%s: can't disconnect %s: no exports found\n",
1517 obd->obd_name, uuid);
1519 CWARN("%s: evicting %s at adminstrative request\n",
1520 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1521 class_fail_export(doomed_exp);
1522 class_export_put(doomed_exp);
1525 cfs_hash_putref(uuid_hash);
1527 return exports_evicted;
1530 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1531 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1534 static void print_export_data(struct obd_export *exp, const char *status,
1537 struct ptlrpc_reply_state *rs;
1538 struct ptlrpc_reply_state *first_reply = NULL;
1541 spin_lock(&exp->exp_lock);
1542 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1548 spin_unlock(&exp->exp_lock);
1550 CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1551 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1552 obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1553 atomic_read(&exp->exp_rpc_count),
1554 atomic_read(&exp->exp_cb_count),
1555 atomic_read(&exp->exp_locks_count),
1556 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1557 nreplies, first_reply, nreplies > 3 ? "..." : "",
1558 exp->exp_last_committed);
1559 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1560 if (locks && class_export_dump_hook != NULL)
1561 class_export_dump_hook(exp);
1565 void dump_exports(struct obd_device *obd, int locks)
1567 struct obd_export *exp;
1569 spin_lock(&obd->obd_dev_lock);
1570 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1571 print_export_data(exp, "ACTIVE", locks);
1572 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1573 print_export_data(exp, "UNLINKED", locks);
1574 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1575 print_export_data(exp, "DELAYED", locks);
1576 spin_unlock(&obd->obd_dev_lock);
1577 spin_lock(&obd_zombie_impexp_lock);
1578 list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1579 print_export_data(exp, "ZOMBIE", locks);
1580 spin_unlock(&obd_zombie_impexp_lock);
1583 void obd_exports_barrier(struct obd_device *obd)
1586 LASSERT(list_empty(&obd->obd_exports));
1587 spin_lock(&obd->obd_dev_lock);
1588 while (!list_empty(&obd->obd_unlinked_exports)) {
1589 spin_unlock(&obd->obd_dev_lock);
1590 set_current_state(TASK_UNINTERRUPTIBLE);
1591 schedule_timeout(cfs_time_seconds(waited));
1592 if (waited > 5 && IS_PO2(waited)) {
1593 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1594 "more than %d seconds. "
1595 "The obd refcount = %d. Is it stuck?\n",
1596 obd->obd_name, waited,
1597 atomic_read(&obd->obd_refcount));
1598 dump_exports(obd, 1);
1601 spin_lock(&obd->obd_dev_lock);
1603 spin_unlock(&obd->obd_dev_lock);
1605 EXPORT_SYMBOL(obd_exports_barrier);
1607 /* Total amount of zombies to be destroyed */
1608 static int zombies_count = 0;
1611 * kill zombie imports and exports
1613 void obd_zombie_impexp_cull(void)
1615 struct obd_import *import;
1616 struct obd_export *export;
1620 spin_lock(&obd_zombie_impexp_lock);
1623 if (!list_empty(&obd_zombie_imports)) {
1624 import = list_entry(obd_zombie_imports.next,
1627 list_del_init(&import->imp_zombie_chain);
1631 if (!list_empty(&obd_zombie_exports)) {
1632 export = list_entry(obd_zombie_exports.next,
1635 list_del_init(&export->exp_obd_chain);
1638 spin_unlock(&obd_zombie_impexp_lock);
1640 if (import != NULL) {
1641 class_import_destroy(import);
1642 spin_lock(&obd_zombie_impexp_lock);
1644 spin_unlock(&obd_zombie_impexp_lock);
1647 if (export != NULL) {
1648 class_export_destroy(export);
1649 spin_lock(&obd_zombie_impexp_lock);
1651 spin_unlock(&obd_zombie_impexp_lock);
1655 } while (import != NULL || export != NULL);
1659 static struct completion obd_zombie_start;
1660 static struct completion obd_zombie_stop;
1661 static unsigned long obd_zombie_flags;
1662 static wait_queue_head_t obd_zombie_waitq;
1663 static pid_t obd_zombie_pid;
1666 OBD_ZOMBIE_STOP = 0x0001,
1670 * check for work for kill zombie import/export thread.
1672 static int obd_zombie_impexp_check(void *arg)
1676 spin_lock(&obd_zombie_impexp_lock);
1677 rc = (zombies_count == 0) &&
1678 !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1679 spin_unlock(&obd_zombie_impexp_lock);
1685 * Add export to the obd_zombe thread and notify it.
1687 static void obd_zombie_export_add(struct obd_export *exp) {
1688 atomic_dec(&obd_stale_export_num);
1689 spin_lock(&exp->exp_obd->obd_dev_lock);
1690 LASSERT(!list_empty(&exp->exp_obd_chain));
1691 list_del_init(&exp->exp_obd_chain);
1692 spin_unlock(&exp->exp_obd->obd_dev_lock);
1693 spin_lock(&obd_zombie_impexp_lock);
1695 list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1696 spin_unlock(&obd_zombie_impexp_lock);
1698 obd_zombie_impexp_notify();
1702 * Add import to the obd_zombe thread and notify it.
1704 static void obd_zombie_import_add(struct obd_import *imp) {
1705 LASSERT(imp->imp_sec == NULL);
1706 spin_lock(&obd_zombie_impexp_lock);
1707 LASSERT(list_empty(&imp->imp_zombie_chain));
1709 list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1710 spin_unlock(&obd_zombie_impexp_lock);
1712 obd_zombie_impexp_notify();
1716 * notify import/export destroy thread about new zombie.
1718 static void obd_zombie_impexp_notify(void)
1721 * Make sure obd_zomebie_impexp_thread get this notification.
1722 * It is possible this signal only get by obd_zombie_barrier, and
1723 * barrier gulps this notification and sleeps away and hangs ensues
1725 wake_up_all(&obd_zombie_waitq);
1729 * check whether obd_zombie is idle
1731 static int obd_zombie_is_idle(void)
1735 LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1736 spin_lock(&obd_zombie_impexp_lock);
1737 rc = (zombies_count == 0);
1738 spin_unlock(&obd_zombie_impexp_lock);
1743 * wait when obd_zombie import/export queues become empty
1745 void obd_zombie_barrier(void)
1747 struct l_wait_info lwi = { 0 };
1749 if (obd_zombie_pid == current_pid())
1750 /* don't wait for myself */
1752 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1754 EXPORT_SYMBOL(obd_zombie_barrier);
1757 struct obd_export *obd_stale_export_get(void)
1759 struct obd_export *exp = NULL;
1762 spin_lock(&obd_stale_export_lock);
1763 if (!list_empty(&obd_stale_exports)) {
1764 exp = list_entry(obd_stale_exports.next,
1765 struct obd_export, exp_stale_list);
1766 list_del_init(&exp->exp_stale_list);
1768 spin_unlock(&obd_stale_export_lock);
1771 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1772 atomic_read(&obd_stale_export_num));
1776 EXPORT_SYMBOL(obd_stale_export_get);
1778 void obd_stale_export_put(struct obd_export *exp)
1782 LASSERT(list_empty(&exp->exp_stale_list));
1783 if (exp->exp_lock_hash &&
1784 atomic_read(&exp->exp_lock_hash->hs_count)) {
1785 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1786 atomic_read(&obd_stale_export_num));
1788 spin_lock_bh(&exp->exp_bl_list_lock);
1789 spin_lock(&obd_stale_export_lock);
1790 /* Add to the tail if there is no blocked locks,
1791 * to the head otherwise. */
1792 if (list_empty(&exp->exp_bl_list))
1793 list_add_tail(&exp->exp_stale_list,
1794 &obd_stale_exports);
1796 list_add(&exp->exp_stale_list,
1797 &obd_stale_exports);
1799 spin_unlock(&obd_stale_export_lock);
1800 spin_unlock_bh(&exp->exp_bl_list_lock);
1802 class_export_put(exp);
1806 EXPORT_SYMBOL(obd_stale_export_put);
1809 * Adjust the position of the export in the stale list,
1810 * i.e. move to the head of the list if is needed.
1812 void obd_stale_export_adjust(struct obd_export *exp)
1814 LASSERT(exp != NULL);
1815 spin_lock_bh(&exp->exp_bl_list_lock);
1816 spin_lock(&obd_stale_export_lock);
1818 if (!list_empty(&exp->exp_stale_list) &&
1819 !list_empty(&exp->exp_bl_list))
1820 list_move(&exp->exp_stale_list, &obd_stale_exports);
1822 spin_unlock(&obd_stale_export_lock);
1823 spin_unlock_bh(&exp->exp_bl_list_lock);
1825 EXPORT_SYMBOL(obd_stale_export_adjust);
1828 * destroy zombie export/import thread.
1830 static int obd_zombie_impexp_thread(void *unused)
1832 unshare_fs_struct();
1833 complete(&obd_zombie_start);
1835 obd_zombie_pid = current_pid();
1837 while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1838 struct l_wait_info lwi = { 0 };
1840 l_wait_event(obd_zombie_waitq,
1841 !obd_zombie_impexp_check(NULL), &lwi);
1842 obd_zombie_impexp_cull();
1845 * Notify obd_zombie_barrier callers that queues
1848 wake_up(&obd_zombie_waitq);
1851 complete(&obd_zombie_stop);
1858 * start destroy zombie import/export thread
1860 int obd_zombie_impexp_init(void)
1862 struct task_struct *task;
1864 INIT_LIST_HEAD(&obd_zombie_imports);
1866 INIT_LIST_HEAD(&obd_zombie_exports);
1867 spin_lock_init(&obd_zombie_impexp_lock);
1868 init_completion(&obd_zombie_start);
1869 init_completion(&obd_zombie_stop);
1870 init_waitqueue_head(&obd_zombie_waitq);
1873 task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
1875 RETURN(PTR_ERR(task));
1877 wait_for_completion(&obd_zombie_start);
1881 * stop destroy zombie import/export thread
1883 void obd_zombie_impexp_stop(void)
1885 set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1886 obd_zombie_impexp_notify();
1887 wait_for_completion(&obd_zombie_stop);
1890 /***** Kernel-userspace comm helpers *******/
1892 /* Get length of entire message, including header */
1893 int kuc_len(int payload_len)
1895 return sizeof(struct kuc_hdr) + payload_len;
1897 EXPORT_SYMBOL(kuc_len);
1899 /* Get a pointer to kuc header, given a ptr to the payload
1900 * @param p Pointer to payload area
1901 * @returns Pointer to kuc header
1903 struct kuc_hdr * kuc_ptr(void *p)
1905 struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
1906 LASSERT(lh->kuc_magic == KUC_MAGIC);
1909 EXPORT_SYMBOL(kuc_ptr);
1911 /* Test if payload is part of kuc message
1912 * @param p Pointer to payload area
1915 int kuc_ispayload(void *p)
1917 struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1;
1919 if (kh->kuc_magic == KUC_MAGIC)
1924 EXPORT_SYMBOL(kuc_ispayload);
1926 /* Alloc space for a message, and fill in header
1927 * @return Pointer to payload area
1929 void *kuc_alloc(int payload_len, int transport, int type)
1932 int len = kuc_len(payload_len);
1936 return ERR_PTR(-ENOMEM);
1938 lh->kuc_magic = KUC_MAGIC;
1939 lh->kuc_transport = transport;
1940 lh->kuc_msgtype = type;
1941 lh->kuc_msglen = len;
1943 return (void *)(lh + 1);
1945 EXPORT_SYMBOL(kuc_alloc);
1947 /* Takes pointer to payload area */
1948 inline void kuc_free(void *p, int payload_len)
1950 struct kuc_hdr *lh = kuc_ptr(p);
1951 OBD_FREE(lh, kuc_len(payload_len));
1953 EXPORT_SYMBOL(kuc_free);
1955 struct obd_request_slot_waiter {
1956 struct list_head orsw_entry;
1957 wait_queue_head_t orsw_waitq;
1961 static bool obd_request_slot_avail(struct client_obd *cli,
1962 struct obd_request_slot_waiter *orsw)
1966 spin_lock(&cli->cl_loi_list_lock);
1967 avail = !!list_empty(&orsw->orsw_entry);
1968 spin_unlock(&cli->cl_loi_list_lock);
1974 * For network flow control, the RPC sponsor needs to acquire a credit
1975 * before sending the RPC. The credits count for a connection is defined
1976 * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
1977 * the subsequent RPC sponsors need to wait until others released their
1978 * credits, or the administrator increased the "cl_max_rpcs_in_flight".
1980 int obd_get_request_slot(struct client_obd *cli)
1982 struct obd_request_slot_waiter orsw;
1983 struct l_wait_info lwi;
1986 spin_lock(&cli->cl_loi_list_lock);
1987 if (cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight) {
1988 cli->cl_r_in_flight++;
1989 spin_unlock(&cli->cl_loi_list_lock);
1993 init_waitqueue_head(&orsw.orsw_waitq);
1994 list_add_tail(&orsw.orsw_entry, &cli->cl_loi_read_list);
1995 orsw.orsw_signaled = false;
1996 spin_unlock(&cli->cl_loi_list_lock);
1998 lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1999 rc = l_wait_event(orsw.orsw_waitq,
2000 obd_request_slot_avail(cli, &orsw) ||
2004 /* Here, we must take the lock to avoid the on-stack 'orsw' to be
2005 * freed but other (such as obd_put_request_slot) is using it. */
2006 spin_lock(&cli->cl_loi_list_lock);
2008 if (!orsw.orsw_signaled) {
2009 if (list_empty(&orsw.orsw_entry))
2010 cli->cl_r_in_flight--;
2012 list_del(&orsw.orsw_entry);
2016 if (orsw.orsw_signaled) {
2017 LASSERT(list_empty(&orsw.orsw_entry));
2021 spin_unlock(&cli->cl_loi_list_lock);
2025 EXPORT_SYMBOL(obd_get_request_slot);
2027 void obd_put_request_slot(struct client_obd *cli)
2029 struct obd_request_slot_waiter *orsw;
2031 spin_lock(&cli->cl_loi_list_lock);
2032 cli->cl_r_in_flight--;
2034 /* If there is free slot, wakeup the first waiter. */
2035 if (!list_empty(&cli->cl_loi_read_list) &&
2036 likely(cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight)) {
2037 orsw = list_entry(cli->cl_loi_read_list.next,
2038 struct obd_request_slot_waiter, orsw_entry);
2039 list_del_init(&orsw->orsw_entry);
2040 cli->cl_r_in_flight++;
2041 wake_up(&orsw->orsw_waitq);
2043 spin_unlock(&cli->cl_loi_list_lock);
2045 EXPORT_SYMBOL(obd_put_request_slot);
2047 __u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
2049 return cli->cl_max_rpcs_in_flight;
2051 EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
2053 int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
2055 struct obd_request_slot_waiter *orsw;
2062 if (max > OBD_MAX_RIF_MAX || max < 1)
2065 typ_name = cli->cl_import->imp_obd->obd_type->typ_name;
2066 if (strcmp(typ_name, LUSTRE_MDC_NAME) == 0) {
2067 /* adjust max_mod_rpcs_in_flight to ensure it is always
2068 * strictly lower that max_rpcs_in_flight */
2070 CERROR("%s: cannot set max_rpcs_in_flight to 1 "
2071 "because it must be higher than "
2072 "max_mod_rpcs_in_flight value",
2073 cli->cl_import->imp_obd->obd_name);
2076 if (max <= cli->cl_max_mod_rpcs_in_flight) {
2077 rc = obd_set_max_mod_rpcs_in_flight(cli, max - 1);
2083 spin_lock(&cli->cl_loi_list_lock);
2084 old = cli->cl_max_rpcs_in_flight;
2085 cli->cl_max_rpcs_in_flight = max;
2088 /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
2089 for (i = 0; i < diff; i++) {
2090 if (list_empty(&cli->cl_loi_read_list))
2093 orsw = list_entry(cli->cl_loi_read_list.next,
2094 struct obd_request_slot_waiter, orsw_entry);
2095 list_del_init(&orsw->orsw_entry);
2096 cli->cl_r_in_flight++;
2097 wake_up(&orsw->orsw_waitq);
2099 spin_unlock(&cli->cl_loi_list_lock);
2103 EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
2105 __u16 obd_get_max_mod_rpcs_in_flight(struct client_obd *cli)
2107 return cli->cl_max_mod_rpcs_in_flight;
2109 EXPORT_SYMBOL(obd_get_max_mod_rpcs_in_flight);
2111 int obd_set_max_mod_rpcs_in_flight(struct client_obd *cli, __u16 max)
2113 struct obd_connect_data *ocd;
2117 if (max > OBD_MAX_RIF_MAX || max < 1)
2120 /* cannot exceed or equal max_rpcs_in_flight */
2121 if (max >= cli->cl_max_rpcs_in_flight) {
2122 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2123 "higher or equal to max_rpcs_in_flight value (%u)\n",
2124 cli->cl_import->imp_obd->obd_name,
2125 max, cli->cl_max_rpcs_in_flight);
2129 /* cannot exceed max modify RPCs in flight supported by the server */
2130 ocd = &cli->cl_import->imp_connect_data;
2131 if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS)
2132 maxmodrpcs = ocd->ocd_maxmodrpcs;
2135 if (max > maxmodrpcs) {
2136 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2137 "higher than max_mod_rpcs_per_client value (%hu) "
2138 "returned by the server at connection\n",
2139 cli->cl_import->imp_obd->obd_name,
2144 spin_lock(&cli->cl_mod_rpcs_lock);
2146 prev = cli->cl_max_mod_rpcs_in_flight;
2147 cli->cl_max_mod_rpcs_in_flight = max;
2149 /* wakeup waiters if limit has been increased */
2150 if (cli->cl_max_mod_rpcs_in_flight > prev)
2151 wake_up(&cli->cl_mod_rpcs_waitq);
2153 spin_unlock(&cli->cl_mod_rpcs_lock);
2157 EXPORT_SYMBOL(obd_set_max_mod_rpcs_in_flight);
2160 #define pct(a, b) (b ? a * 100 / b : 0)
2161 int obd_mod_rpc_stats_seq_show(struct client_obd *cli,
2162 struct seq_file *seq)
2165 unsigned long mod_tot = 0, mod_cum;
2168 do_gettimeofday(&now);
2170 spin_lock(&cli->cl_mod_rpcs_lock);
2172 seq_printf(seq, "snapshot_time: %lu.%lu (secs.usecs)\n",
2173 now.tv_sec, now.tv_usec);
2174 seq_printf(seq, "modify_RPCs_in_flight: %hu\n",
2175 cli->cl_mod_rpcs_in_flight);
2177 seq_printf(seq, "\n\t\t\tmodify\n");
2178 seq_printf(seq, "rpcs in flight rpcs %% cum %%\n");
2180 mod_tot = lprocfs_oh_sum(&cli->cl_mod_rpcs_hist);
2183 for (i = 0; i < OBD_HIST_MAX; i++) {
2184 unsigned long mod = cli->cl_mod_rpcs_hist.oh_buckets[i];
2186 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu\n",
2187 i, mod, pct(mod, mod_tot),
2188 pct(mod_cum, mod_tot));
2189 if (mod_cum == mod_tot)
2193 spin_unlock(&cli->cl_mod_rpcs_lock);
2197 EXPORT_SYMBOL(obd_mod_rpc_stats_seq_show);
2201 /* The number of modify RPCs sent in parallel is limited
2202 * because the server has a finite number of slots per client to
2203 * store request result and ensure reply reconstruction when needed.
2204 * On the client, this limit is stored in cl_max_mod_rpcs_in_flight
2205 * that takes into account server limit and cl_max_rpcs_in_flight
2207 * On the MDC client, to avoid a potential deadlock (see Bugzilla 3462),
2208 * one close request is allowed above the maximum.
2210 static inline bool obd_mod_rpc_slot_avail_locked(struct client_obd *cli,
2215 /* A slot is available if
2216 * - number of modify RPCs in flight is less than the max
2217 * - it's a close RPC and no other close request is in flight
2219 avail = cli->cl_mod_rpcs_in_flight < cli->cl_max_mod_rpcs_in_flight ||
2220 (close_req && cli->cl_close_rpcs_in_flight == 0);
2225 static inline bool obd_mod_rpc_slot_avail(struct client_obd *cli,
2230 spin_lock(&cli->cl_mod_rpcs_lock);
2231 avail = obd_mod_rpc_slot_avail_locked(cli, close_req);
2232 spin_unlock(&cli->cl_mod_rpcs_lock);
2236 /* Get a modify RPC slot from the obd client @cli according
2237 * to the kind of operation @opc that is going to be sent
2238 * and the intent @it of the operation if it applies.
2239 * If the maximum number of modify RPCs in flight is reached
2240 * the thread is put to sleep.
2241 * Returns the tag to be set in the request message. Tag 0
2242 * is reserved for non-modifying requests.
2244 __u16 obd_get_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2245 struct lookup_intent *it)
2247 struct l_wait_info lwi = LWI_INTR(NULL, NULL);
2248 bool close_req = false;
2251 /* read-only metadata RPCs don't consume a slot on MDT
2252 * for reply reconstruction
2254 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2255 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2258 if (opc == MDS_CLOSE)
2262 spin_lock(&cli->cl_mod_rpcs_lock);
2263 max = cli->cl_max_mod_rpcs_in_flight;
2264 if (obd_mod_rpc_slot_avail_locked(cli, close_req)) {
2265 /* there is a slot available */
2266 cli->cl_mod_rpcs_in_flight++;
2268 cli->cl_close_rpcs_in_flight++;
2269 lprocfs_oh_tally(&cli->cl_mod_rpcs_hist,
2270 cli->cl_mod_rpcs_in_flight);
2271 /* find a free tag */
2272 i = find_first_zero_bit(cli->cl_mod_tag_bitmap,
2274 LASSERT(i < OBD_MAX_RIF_MAX);
2275 LASSERT(!test_and_set_bit(i, cli->cl_mod_tag_bitmap));
2276 spin_unlock(&cli->cl_mod_rpcs_lock);
2277 /* tag 0 is reserved for non-modify RPCs */
2280 spin_unlock(&cli->cl_mod_rpcs_lock);
2282 CDEBUG(D_RPCTRACE, "%s: sleeping for a modify RPC slot "
2283 "opc %u, max %hu\n",
2284 cli->cl_import->imp_obd->obd_name, opc, max);
2286 l_wait_event(cli->cl_mod_rpcs_waitq,
2287 obd_mod_rpc_slot_avail(cli, close_req), &lwi);
2290 EXPORT_SYMBOL(obd_get_mod_rpc_slot);
2292 /* Put a modify RPC slot from the obd client @cli according
2293 * to the kind of operation @opc that has been sent and the
2294 * intent @it of the operation if it applies.
2296 void obd_put_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2297 struct lookup_intent *it, __u16 tag)
2299 bool close_req = false;
2301 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2302 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2305 if (opc == MDS_CLOSE)
2308 spin_lock(&cli->cl_mod_rpcs_lock);
2309 cli->cl_mod_rpcs_in_flight--;
2311 cli->cl_close_rpcs_in_flight--;
2312 /* release the tag in the bitmap */
2313 LASSERT(tag - 1 < OBD_MAX_RIF_MAX);
2314 LASSERT(test_and_clear_bit(tag - 1, cli->cl_mod_tag_bitmap) != 0);
2315 spin_unlock(&cli->cl_mod_rpcs_lock);
2316 wake_up(&cli->cl_mod_rpcs_waitq);
2318 EXPORT_SYMBOL(obd_put_mod_rpc_slot);