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, int debug_level);
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 %#llx\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);
1126 EXPORT_SYMBOL(__class_export_add_lock_ref);
1128 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1130 spin_lock(&exp->exp_locks_list_guard);
1131 LASSERT(lock->l_exp_refs_nr > 0);
1132 if (lock->l_exp_refs_target != exp) {
1133 LCONSOLE_WARN("lock %p, "
1134 "mismatching export pointers: %p, %p\n",
1135 lock, lock->l_exp_refs_target, exp);
1137 if (-- lock->l_exp_refs_nr == 0) {
1138 list_del_init(&lock->l_exp_refs_link);
1139 lock->l_exp_refs_target = NULL;
1141 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1142 lock, exp, lock->l_exp_refs_nr);
1143 spin_unlock(&exp->exp_locks_list_guard);
1145 EXPORT_SYMBOL(__class_export_del_lock_ref);
1148 /* A connection defines an export context in which preallocation can
1149 be managed. This releases the export pointer reference, and returns
1150 the export handle, so the export refcount is 1 when this function
1152 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1153 struct obd_uuid *cluuid)
1155 struct obd_export *export;
1156 LASSERT(conn != NULL);
1157 LASSERT(obd != NULL);
1158 LASSERT(cluuid != NULL);
1161 export = class_new_export(obd, cluuid);
1163 RETURN(PTR_ERR(export));
1165 conn->cookie = export->exp_handle.h_cookie;
1166 class_export_put(export);
1168 CDEBUG(D_IOCTL, "connect: client %s, cookie %#llx\n",
1169 cluuid->uuid, conn->cookie);
1172 EXPORT_SYMBOL(class_connect);
1174 /* if export is involved in recovery then clean up related things */
1175 static void class_export_recovery_cleanup(struct obd_export *exp)
1177 struct obd_device *obd = exp->exp_obd;
1179 spin_lock(&obd->obd_recovery_task_lock);
1180 if (obd->obd_recovering) {
1181 if (exp->exp_in_recovery) {
1182 spin_lock(&exp->exp_lock);
1183 exp->exp_in_recovery = 0;
1184 spin_unlock(&exp->exp_lock);
1185 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1186 atomic_dec(&obd->obd_connected_clients);
1189 /* if called during recovery then should update
1190 * obd_stale_clients counter,
1191 * lightweight exports are not counted */
1192 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1193 exp->exp_obd->obd_stale_clients++;
1195 spin_unlock(&obd->obd_recovery_task_lock);
1197 spin_lock(&exp->exp_lock);
1198 /** Cleanup req replay fields */
1199 if (exp->exp_req_replay_needed) {
1200 exp->exp_req_replay_needed = 0;
1202 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1203 atomic_dec(&obd->obd_req_replay_clients);
1206 /** Cleanup lock replay data */
1207 if (exp->exp_lock_replay_needed) {
1208 exp->exp_lock_replay_needed = 0;
1210 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1211 atomic_dec(&obd->obd_lock_replay_clients);
1213 spin_unlock(&exp->exp_lock);
1216 /* This function removes 1-3 references from the export:
1217 * 1 - for export pointer passed
1218 * and if disconnect really need
1219 * 2 - removing from hash
1220 * 3 - in client_unlink_export
1221 * The export pointer passed to this function can destroyed */
1222 int class_disconnect(struct obd_export *export)
1224 int already_disconnected;
1227 if (export == NULL) {
1228 CWARN("attempting to free NULL export %p\n", export);
1232 spin_lock(&export->exp_lock);
1233 already_disconnected = export->exp_disconnected;
1234 export->exp_disconnected = 1;
1235 spin_unlock(&export->exp_lock);
1237 /* class_cleanup(), abort_recovery(), and class_fail_export()
1238 * all end up in here, and if any of them race we shouldn't
1239 * call extra class_export_puts(). */
1240 if (already_disconnected) {
1241 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1242 GOTO(no_disconn, already_disconnected);
1245 CDEBUG(D_IOCTL, "disconnect: cookie %#llx\n",
1246 export->exp_handle.h_cookie);
1248 if (!hlist_unhashed(&export->exp_nid_hash))
1249 cfs_hash_del(export->exp_obd->obd_nid_hash,
1250 &export->exp_connection->c_peer.nid,
1251 &export->exp_nid_hash);
1253 class_export_recovery_cleanup(export);
1254 class_unlink_export(export);
1256 class_export_put(export);
1259 EXPORT_SYMBOL(class_disconnect);
1261 /* Return non-zero for a fully connected export */
1262 int class_connected_export(struct obd_export *exp)
1267 spin_lock(&exp->exp_lock);
1268 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1269 spin_unlock(&exp->exp_lock);
1273 EXPORT_SYMBOL(class_connected_export);
1275 static void class_disconnect_export_list(struct list_head *list,
1276 enum obd_option flags)
1279 struct obd_export *exp;
1282 /* It's possible that an export may disconnect itself, but
1283 * nothing else will be added to this list. */
1284 while (!list_empty(list)) {
1285 exp = list_entry(list->next, struct obd_export,
1287 /* need for safe call CDEBUG after obd_disconnect */
1288 class_export_get(exp);
1290 spin_lock(&exp->exp_lock);
1291 exp->exp_flags = flags;
1292 spin_unlock(&exp->exp_lock);
1294 if (obd_uuid_equals(&exp->exp_client_uuid,
1295 &exp->exp_obd->obd_uuid)) {
1297 "exp %p export uuid == obd uuid, don't discon\n",
1299 /* Need to delete this now so we don't end up pointing
1300 * to work_list later when this export is cleaned up. */
1301 list_del_init(&exp->exp_obd_chain);
1302 class_export_put(exp);
1306 class_export_get(exp);
1307 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1308 "last request at "CFS_TIME_T"\n",
1309 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1310 exp, exp->exp_last_request_time);
1311 /* release one export reference anyway */
1312 rc = obd_disconnect(exp);
1314 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1315 obd_export_nid2str(exp), exp, rc);
1316 class_export_put(exp);
1321 void class_disconnect_exports(struct obd_device *obd)
1323 struct list_head work_list;
1326 /* Move all of the exports from obd_exports to a work list, en masse. */
1327 INIT_LIST_HEAD(&work_list);
1328 spin_lock(&obd->obd_dev_lock);
1329 list_splice_init(&obd->obd_exports, &work_list);
1330 list_splice_init(&obd->obd_delayed_exports, &work_list);
1331 spin_unlock(&obd->obd_dev_lock);
1333 if (!list_empty(&work_list)) {
1334 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1335 "disconnecting them\n", obd->obd_minor, obd);
1336 class_disconnect_export_list(&work_list,
1337 exp_flags_from_obd(obd));
1339 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1340 obd->obd_minor, obd);
1343 EXPORT_SYMBOL(class_disconnect_exports);
1345 /* Remove exports that have not completed recovery.
1347 void class_disconnect_stale_exports(struct obd_device *obd,
1348 int (*test_export)(struct obd_export *))
1350 struct list_head work_list;
1351 struct obd_export *exp, *n;
1355 INIT_LIST_HEAD(&work_list);
1356 spin_lock(&obd->obd_dev_lock);
1357 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1359 /* don't count self-export as client */
1360 if (obd_uuid_equals(&exp->exp_client_uuid,
1361 &exp->exp_obd->obd_uuid))
1364 /* don't evict clients which have no slot in last_rcvd
1365 * (e.g. lightweight connection) */
1366 if (exp->exp_target_data.ted_lr_idx == -1)
1369 spin_lock(&exp->exp_lock);
1370 if (exp->exp_failed || test_export(exp)) {
1371 spin_unlock(&exp->exp_lock);
1374 exp->exp_failed = 1;
1375 spin_unlock(&exp->exp_lock);
1377 list_move(&exp->exp_obd_chain, &work_list);
1379 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1380 obd->obd_name, exp->exp_client_uuid.uuid,
1381 exp->exp_connection == NULL ? "<unknown>" :
1382 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1383 print_export_data(exp, "EVICTING", 0, D_HA);
1385 spin_unlock(&obd->obd_dev_lock);
1388 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1389 obd->obd_name, evicted);
1391 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1392 OBD_OPT_ABORT_RECOV);
1395 EXPORT_SYMBOL(class_disconnect_stale_exports);
1397 void class_fail_export(struct obd_export *exp)
1399 int rc, already_failed;
1401 spin_lock(&exp->exp_lock);
1402 already_failed = exp->exp_failed;
1403 exp->exp_failed = 1;
1404 spin_unlock(&exp->exp_lock);
1406 if (already_failed) {
1407 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1408 exp, exp->exp_client_uuid.uuid);
1412 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1413 exp, exp->exp_client_uuid.uuid);
1415 if (obd_dump_on_timeout)
1416 libcfs_debug_dumplog();
1418 /* need for safe call CDEBUG after obd_disconnect */
1419 class_export_get(exp);
1421 /* Most callers into obd_disconnect are removing their own reference
1422 * (request, for example) in addition to the one from the hash table.
1423 * We don't have such a reference here, so make one. */
1424 class_export_get(exp);
1425 rc = obd_disconnect(exp);
1427 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1429 CDEBUG(D_HA, "disconnected export %p/%s\n",
1430 exp, exp->exp_client_uuid.uuid);
1431 class_export_put(exp);
1433 EXPORT_SYMBOL(class_fail_export);
1435 char *obd_export_nid2str(struct obd_export *exp)
1437 if (exp->exp_connection != NULL)
1438 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1442 EXPORT_SYMBOL(obd_export_nid2str);
1444 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1446 struct cfs_hash *nid_hash;
1447 struct obd_export *doomed_exp = NULL;
1448 int exports_evicted = 0;
1450 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1452 spin_lock(&obd->obd_dev_lock);
1453 /* umount has run already, so evict thread should leave
1454 * its task to umount thread now */
1455 if (obd->obd_stopping) {
1456 spin_unlock(&obd->obd_dev_lock);
1457 return exports_evicted;
1459 nid_hash = obd->obd_nid_hash;
1460 cfs_hash_getref(nid_hash);
1461 spin_unlock(&obd->obd_dev_lock);
1464 doomed_exp = cfs_hash_lookup(nid_hash, &nid_key);
1465 if (doomed_exp == NULL)
1468 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1469 "nid %s found, wanted nid %s, requested nid %s\n",
1470 obd_export_nid2str(doomed_exp),
1471 libcfs_nid2str(nid_key), nid);
1472 LASSERTF(doomed_exp != obd->obd_self_export,
1473 "self-export is hashed by NID?\n");
1475 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative "
1476 "request\n", obd->obd_name,
1477 obd_uuid2str(&doomed_exp->exp_client_uuid),
1478 obd_export_nid2str(doomed_exp));
1479 class_fail_export(doomed_exp);
1480 class_export_put(doomed_exp);
1483 cfs_hash_putref(nid_hash);
1485 if (!exports_evicted)
1486 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1487 obd->obd_name, nid);
1488 return exports_evicted;
1490 EXPORT_SYMBOL(obd_export_evict_by_nid);
1492 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1494 struct cfs_hash *uuid_hash;
1495 struct obd_export *doomed_exp = NULL;
1496 struct obd_uuid doomed_uuid;
1497 int exports_evicted = 0;
1499 spin_lock(&obd->obd_dev_lock);
1500 if (obd->obd_stopping) {
1501 spin_unlock(&obd->obd_dev_lock);
1502 return exports_evicted;
1504 uuid_hash = obd->obd_uuid_hash;
1505 cfs_hash_getref(uuid_hash);
1506 spin_unlock(&obd->obd_dev_lock);
1508 obd_str2uuid(&doomed_uuid, uuid);
1509 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1510 CERROR("%s: can't evict myself\n", obd->obd_name);
1511 cfs_hash_putref(uuid_hash);
1512 return exports_evicted;
1515 doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid);
1517 if (doomed_exp == NULL) {
1518 CERROR("%s: can't disconnect %s: no exports found\n",
1519 obd->obd_name, uuid);
1521 CWARN("%s: evicting %s at adminstrative request\n",
1522 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1523 class_fail_export(doomed_exp);
1524 class_export_put(doomed_exp);
1527 cfs_hash_putref(uuid_hash);
1529 return exports_evicted;
1532 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1533 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1534 EXPORT_SYMBOL(class_export_dump_hook);
1537 static void print_export_data(struct obd_export *exp, const char *status,
1538 int locks, int debug_level)
1540 struct ptlrpc_reply_state *rs;
1541 struct ptlrpc_reply_state *first_reply = NULL;
1544 spin_lock(&exp->exp_lock);
1545 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1551 spin_unlock(&exp->exp_lock);
1553 CDEBUG(debug_level, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: "
1554 "%p %s %llu stale:%d\n",
1555 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1556 obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1557 atomic_read(&exp->exp_rpc_count),
1558 atomic_read(&exp->exp_cb_count),
1559 atomic_read(&exp->exp_locks_count),
1560 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1561 nreplies, first_reply, nreplies > 3 ? "..." : "",
1562 exp->exp_last_committed, !list_empty(&exp->exp_stale_list));
1563 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1564 if (locks && class_export_dump_hook != NULL)
1565 class_export_dump_hook(exp);
1569 void dump_exports(struct obd_device *obd, int locks, int debug_level)
1571 struct obd_export *exp;
1573 spin_lock(&obd->obd_dev_lock);
1574 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1575 print_export_data(exp, "ACTIVE", locks, debug_level);
1576 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1577 print_export_data(exp, "UNLINKED", locks, debug_level);
1578 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1579 print_export_data(exp, "DELAYED", locks, debug_level);
1580 spin_unlock(&obd->obd_dev_lock);
1581 spin_lock(&obd_zombie_impexp_lock);
1582 list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1583 print_export_data(exp, "ZOMBIE", locks, debug_level);
1584 spin_unlock(&obd_zombie_impexp_lock);
1587 void obd_exports_barrier(struct obd_device *obd)
1590 LASSERT(list_empty(&obd->obd_exports));
1591 spin_lock(&obd->obd_dev_lock);
1592 while (!list_empty(&obd->obd_unlinked_exports)) {
1593 spin_unlock(&obd->obd_dev_lock);
1594 set_current_state(TASK_UNINTERRUPTIBLE);
1595 schedule_timeout(cfs_time_seconds(waited));
1596 if (waited > 5 && IS_PO2(waited)) {
1597 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1598 "more than %d seconds. "
1599 "The obd refcount = %d. Is it stuck?\n",
1600 obd->obd_name, waited,
1601 atomic_read(&obd->obd_refcount));
1602 dump_exports(obd, 1, D_CONSOLE | D_WARNING);
1605 spin_lock(&obd->obd_dev_lock);
1607 spin_unlock(&obd->obd_dev_lock);
1609 EXPORT_SYMBOL(obd_exports_barrier);
1611 /* Total amount of zombies to be destroyed */
1612 static int zombies_count = 0;
1615 * kill zombie imports and exports
1617 void obd_zombie_impexp_cull(void)
1619 struct obd_import *import;
1620 struct obd_export *export;
1624 spin_lock(&obd_zombie_impexp_lock);
1627 if (!list_empty(&obd_zombie_imports)) {
1628 import = list_entry(obd_zombie_imports.next,
1631 list_del_init(&import->imp_zombie_chain);
1635 if (!list_empty(&obd_zombie_exports)) {
1636 export = list_entry(obd_zombie_exports.next,
1639 list_del_init(&export->exp_obd_chain);
1642 spin_unlock(&obd_zombie_impexp_lock);
1644 if (import != NULL) {
1645 class_import_destroy(import);
1646 spin_lock(&obd_zombie_impexp_lock);
1648 spin_unlock(&obd_zombie_impexp_lock);
1651 if (export != NULL) {
1652 class_export_destroy(export);
1653 spin_lock(&obd_zombie_impexp_lock);
1655 spin_unlock(&obd_zombie_impexp_lock);
1659 } while (import != NULL || export != NULL);
1663 static struct completion obd_zombie_start;
1664 static struct completion obd_zombie_stop;
1665 static unsigned long obd_zombie_flags;
1666 static wait_queue_head_t obd_zombie_waitq;
1667 static pid_t obd_zombie_pid;
1670 OBD_ZOMBIE_STOP = 0x0001,
1674 * check for work for kill zombie import/export thread.
1676 static int obd_zombie_impexp_check(void *arg)
1680 spin_lock(&obd_zombie_impexp_lock);
1681 rc = (zombies_count == 0) &&
1682 !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1683 spin_unlock(&obd_zombie_impexp_lock);
1689 * Add export to the obd_zombe thread and notify it.
1691 static void obd_zombie_export_add(struct obd_export *exp) {
1692 atomic_dec(&obd_stale_export_num);
1693 spin_lock(&exp->exp_obd->obd_dev_lock);
1694 LASSERT(!list_empty(&exp->exp_obd_chain));
1695 list_del_init(&exp->exp_obd_chain);
1696 spin_unlock(&exp->exp_obd->obd_dev_lock);
1697 spin_lock(&obd_zombie_impexp_lock);
1699 list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1700 spin_unlock(&obd_zombie_impexp_lock);
1702 obd_zombie_impexp_notify();
1706 * Add import to the obd_zombe thread and notify it.
1708 static void obd_zombie_import_add(struct obd_import *imp) {
1709 LASSERT(imp->imp_sec == NULL);
1710 spin_lock(&obd_zombie_impexp_lock);
1711 LASSERT(list_empty(&imp->imp_zombie_chain));
1713 list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1714 spin_unlock(&obd_zombie_impexp_lock);
1716 obd_zombie_impexp_notify();
1720 * notify import/export destroy thread about new zombie.
1722 static void obd_zombie_impexp_notify(void)
1725 * Make sure obd_zomebie_impexp_thread get this notification.
1726 * It is possible this signal only get by obd_zombie_barrier, and
1727 * barrier gulps this notification and sleeps away and hangs ensues
1729 wake_up_all(&obd_zombie_waitq);
1733 * check whether obd_zombie is idle
1735 static int obd_zombie_is_idle(void)
1739 LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1740 spin_lock(&obd_zombie_impexp_lock);
1741 rc = (zombies_count == 0);
1742 spin_unlock(&obd_zombie_impexp_lock);
1747 * wait when obd_zombie import/export queues become empty
1749 void obd_zombie_barrier(void)
1751 struct l_wait_info lwi = { 0 };
1753 if (obd_zombie_pid == current_pid())
1754 /* don't wait for myself */
1756 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1758 EXPORT_SYMBOL(obd_zombie_barrier);
1761 struct obd_export *obd_stale_export_get(void)
1763 struct obd_export *exp = NULL;
1766 spin_lock(&obd_stale_export_lock);
1767 if (!list_empty(&obd_stale_exports)) {
1768 exp = list_entry(obd_stale_exports.next,
1769 struct obd_export, exp_stale_list);
1770 list_del_init(&exp->exp_stale_list);
1772 spin_unlock(&obd_stale_export_lock);
1775 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1776 atomic_read(&obd_stale_export_num));
1780 EXPORT_SYMBOL(obd_stale_export_get);
1782 void obd_stale_export_put(struct obd_export *exp)
1786 LASSERT(list_empty(&exp->exp_stale_list));
1787 if (exp->exp_lock_hash &&
1788 atomic_read(&exp->exp_lock_hash->hs_count)) {
1789 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1790 atomic_read(&obd_stale_export_num));
1792 spin_lock_bh(&exp->exp_bl_list_lock);
1793 spin_lock(&obd_stale_export_lock);
1794 /* Add to the tail if there is no blocked locks,
1795 * to the head otherwise. */
1796 if (list_empty(&exp->exp_bl_list))
1797 list_add_tail(&exp->exp_stale_list,
1798 &obd_stale_exports);
1800 list_add(&exp->exp_stale_list,
1801 &obd_stale_exports);
1803 spin_unlock(&obd_stale_export_lock);
1804 spin_unlock_bh(&exp->exp_bl_list_lock);
1806 class_export_put(exp);
1810 EXPORT_SYMBOL(obd_stale_export_put);
1813 * Adjust the position of the export in the stale list,
1814 * i.e. move to the head of the list if is needed.
1816 void obd_stale_export_adjust(struct obd_export *exp)
1818 LASSERT(exp != NULL);
1819 spin_lock_bh(&exp->exp_bl_list_lock);
1820 spin_lock(&obd_stale_export_lock);
1822 if (!list_empty(&exp->exp_stale_list) &&
1823 !list_empty(&exp->exp_bl_list))
1824 list_move(&exp->exp_stale_list, &obd_stale_exports);
1826 spin_unlock(&obd_stale_export_lock);
1827 spin_unlock_bh(&exp->exp_bl_list_lock);
1829 EXPORT_SYMBOL(obd_stale_export_adjust);
1832 * destroy zombie export/import thread.
1834 static int obd_zombie_impexp_thread(void *unused)
1836 unshare_fs_struct();
1837 complete(&obd_zombie_start);
1839 obd_zombie_pid = current_pid();
1841 while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1842 struct l_wait_info lwi = { 0 };
1844 l_wait_event(obd_zombie_waitq,
1845 !obd_zombie_impexp_check(NULL), &lwi);
1846 obd_zombie_impexp_cull();
1849 * Notify obd_zombie_barrier callers that queues
1852 wake_up(&obd_zombie_waitq);
1855 complete(&obd_zombie_stop);
1862 * start destroy zombie import/export thread
1864 int obd_zombie_impexp_init(void)
1866 struct task_struct *task;
1868 INIT_LIST_HEAD(&obd_zombie_imports);
1870 INIT_LIST_HEAD(&obd_zombie_exports);
1871 spin_lock_init(&obd_zombie_impexp_lock);
1872 init_completion(&obd_zombie_start);
1873 init_completion(&obd_zombie_stop);
1874 init_waitqueue_head(&obd_zombie_waitq);
1877 task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
1879 RETURN(PTR_ERR(task));
1881 wait_for_completion(&obd_zombie_start);
1885 * stop destroy zombie import/export thread
1887 void obd_zombie_impexp_stop(void)
1889 set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1890 obd_zombie_impexp_notify();
1891 wait_for_completion(&obd_zombie_stop);
1894 /***** Kernel-userspace comm helpers *******/
1896 /* Get length of entire message, including header */
1897 int kuc_len(int payload_len)
1899 return sizeof(struct kuc_hdr) + payload_len;
1901 EXPORT_SYMBOL(kuc_len);
1903 /* Get a pointer to kuc header, given a ptr to the payload
1904 * @param p Pointer to payload area
1905 * @returns Pointer to kuc header
1907 struct kuc_hdr * kuc_ptr(void *p)
1909 struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
1910 LASSERT(lh->kuc_magic == KUC_MAGIC);
1913 EXPORT_SYMBOL(kuc_ptr);
1915 /* Alloc space for a message, and fill in header
1916 * @return Pointer to payload area
1918 void *kuc_alloc(int payload_len, int transport, int type)
1921 int len = kuc_len(payload_len);
1925 return ERR_PTR(-ENOMEM);
1927 lh->kuc_magic = KUC_MAGIC;
1928 lh->kuc_transport = transport;
1929 lh->kuc_msgtype = type;
1930 lh->kuc_msglen = len;
1932 return (void *)(lh + 1);
1934 EXPORT_SYMBOL(kuc_alloc);
1936 /* Takes pointer to payload area */
1937 inline void kuc_free(void *p, int payload_len)
1939 struct kuc_hdr *lh = kuc_ptr(p);
1940 OBD_FREE(lh, kuc_len(payload_len));
1942 EXPORT_SYMBOL(kuc_free);
1944 struct obd_request_slot_waiter {
1945 struct list_head orsw_entry;
1946 wait_queue_head_t orsw_waitq;
1950 static bool obd_request_slot_avail(struct client_obd *cli,
1951 struct obd_request_slot_waiter *orsw)
1955 spin_lock(&cli->cl_loi_list_lock);
1956 avail = !!list_empty(&orsw->orsw_entry);
1957 spin_unlock(&cli->cl_loi_list_lock);
1963 * For network flow control, the RPC sponsor needs to acquire a credit
1964 * before sending the RPC. The credits count for a connection is defined
1965 * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
1966 * the subsequent RPC sponsors need to wait until others released their
1967 * credits, or the administrator increased the "cl_max_rpcs_in_flight".
1969 int obd_get_request_slot(struct client_obd *cli)
1971 struct obd_request_slot_waiter orsw;
1972 struct l_wait_info lwi;
1975 spin_lock(&cli->cl_loi_list_lock);
1976 if (cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight) {
1977 cli->cl_r_in_flight++;
1978 spin_unlock(&cli->cl_loi_list_lock);
1982 init_waitqueue_head(&orsw.orsw_waitq);
1983 list_add_tail(&orsw.orsw_entry, &cli->cl_loi_read_list);
1984 orsw.orsw_signaled = false;
1985 spin_unlock(&cli->cl_loi_list_lock);
1987 lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1988 rc = l_wait_event(orsw.orsw_waitq,
1989 obd_request_slot_avail(cli, &orsw) ||
1993 /* Here, we must take the lock to avoid the on-stack 'orsw' to be
1994 * freed but other (such as obd_put_request_slot) is using it. */
1995 spin_lock(&cli->cl_loi_list_lock);
1997 if (!orsw.orsw_signaled) {
1998 if (list_empty(&orsw.orsw_entry))
1999 cli->cl_r_in_flight--;
2001 list_del(&orsw.orsw_entry);
2005 if (orsw.orsw_signaled) {
2006 LASSERT(list_empty(&orsw.orsw_entry));
2010 spin_unlock(&cli->cl_loi_list_lock);
2014 EXPORT_SYMBOL(obd_get_request_slot);
2016 void obd_put_request_slot(struct client_obd *cli)
2018 struct obd_request_slot_waiter *orsw;
2020 spin_lock(&cli->cl_loi_list_lock);
2021 cli->cl_r_in_flight--;
2023 /* If there is free slot, wakeup the first waiter. */
2024 if (!list_empty(&cli->cl_loi_read_list) &&
2025 likely(cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight)) {
2026 orsw = list_entry(cli->cl_loi_read_list.next,
2027 struct obd_request_slot_waiter, orsw_entry);
2028 list_del_init(&orsw->orsw_entry);
2029 cli->cl_r_in_flight++;
2030 wake_up(&orsw->orsw_waitq);
2032 spin_unlock(&cli->cl_loi_list_lock);
2034 EXPORT_SYMBOL(obd_put_request_slot);
2036 __u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
2038 return cli->cl_max_rpcs_in_flight;
2040 EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
2042 int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
2044 struct obd_request_slot_waiter *orsw;
2051 if (max > OBD_MAX_RIF_MAX || max < 1)
2054 typ_name = cli->cl_import->imp_obd->obd_type->typ_name;
2055 if (strcmp(typ_name, LUSTRE_MDC_NAME) == 0) {
2056 /* adjust max_mod_rpcs_in_flight to ensure it is always
2057 * strictly lower that max_rpcs_in_flight */
2059 CERROR("%s: cannot set max_rpcs_in_flight to 1 "
2060 "because it must be higher than "
2061 "max_mod_rpcs_in_flight value",
2062 cli->cl_import->imp_obd->obd_name);
2065 if (max <= cli->cl_max_mod_rpcs_in_flight) {
2066 rc = obd_set_max_mod_rpcs_in_flight(cli, max - 1);
2072 spin_lock(&cli->cl_loi_list_lock);
2073 old = cli->cl_max_rpcs_in_flight;
2074 cli->cl_max_rpcs_in_flight = max;
2077 /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
2078 for (i = 0; i < diff; i++) {
2079 if (list_empty(&cli->cl_loi_read_list))
2082 orsw = list_entry(cli->cl_loi_read_list.next,
2083 struct obd_request_slot_waiter, orsw_entry);
2084 list_del_init(&orsw->orsw_entry);
2085 cli->cl_r_in_flight++;
2086 wake_up(&orsw->orsw_waitq);
2088 spin_unlock(&cli->cl_loi_list_lock);
2092 EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
2094 __u16 obd_get_max_mod_rpcs_in_flight(struct client_obd *cli)
2096 return cli->cl_max_mod_rpcs_in_flight;
2098 EXPORT_SYMBOL(obd_get_max_mod_rpcs_in_flight);
2100 int obd_set_max_mod_rpcs_in_flight(struct client_obd *cli, __u16 max)
2102 struct obd_connect_data *ocd;
2106 if (max > OBD_MAX_RIF_MAX || max < 1)
2109 /* cannot exceed or equal max_rpcs_in_flight */
2110 if (max >= cli->cl_max_rpcs_in_flight) {
2111 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2112 "higher or equal to max_rpcs_in_flight value (%u)\n",
2113 cli->cl_import->imp_obd->obd_name,
2114 max, cli->cl_max_rpcs_in_flight);
2118 /* cannot exceed max modify RPCs in flight supported by the server */
2119 ocd = &cli->cl_import->imp_connect_data;
2120 if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS)
2121 maxmodrpcs = ocd->ocd_maxmodrpcs;
2124 if (max > maxmodrpcs) {
2125 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2126 "higher than max_mod_rpcs_per_client value (%hu) "
2127 "returned by the server at connection\n",
2128 cli->cl_import->imp_obd->obd_name,
2133 spin_lock(&cli->cl_mod_rpcs_lock);
2135 prev = cli->cl_max_mod_rpcs_in_flight;
2136 cli->cl_max_mod_rpcs_in_flight = max;
2138 /* wakeup waiters if limit has been increased */
2139 if (cli->cl_max_mod_rpcs_in_flight > prev)
2140 wake_up(&cli->cl_mod_rpcs_waitq);
2142 spin_unlock(&cli->cl_mod_rpcs_lock);
2146 EXPORT_SYMBOL(obd_set_max_mod_rpcs_in_flight);
2149 #define pct(a, b) (b ? a * 100 / b : 0)
2150 int obd_mod_rpc_stats_seq_show(struct client_obd *cli,
2151 struct seq_file *seq)
2154 unsigned long mod_tot = 0, mod_cum;
2157 do_gettimeofday(&now);
2159 spin_lock(&cli->cl_mod_rpcs_lock);
2161 seq_printf(seq, "snapshot_time: %lu.%lu (secs.usecs)\n",
2162 now.tv_sec, now.tv_usec);
2163 seq_printf(seq, "modify_RPCs_in_flight: %hu\n",
2164 cli->cl_mod_rpcs_in_flight);
2166 seq_printf(seq, "\n\t\t\tmodify\n");
2167 seq_printf(seq, "rpcs in flight rpcs %% cum %%\n");
2169 mod_tot = lprocfs_oh_sum(&cli->cl_mod_rpcs_hist);
2172 for (i = 0; i < OBD_HIST_MAX; i++) {
2173 unsigned long mod = cli->cl_mod_rpcs_hist.oh_buckets[i];
2175 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu\n",
2176 i, mod, pct(mod, mod_tot),
2177 pct(mod_cum, mod_tot));
2178 if (mod_cum == mod_tot)
2182 spin_unlock(&cli->cl_mod_rpcs_lock);
2186 EXPORT_SYMBOL(obd_mod_rpc_stats_seq_show);
2190 /* The number of modify RPCs sent in parallel is limited
2191 * because the server has a finite number of slots per client to
2192 * store request result and ensure reply reconstruction when needed.
2193 * On the client, this limit is stored in cl_max_mod_rpcs_in_flight
2194 * that takes into account server limit and cl_max_rpcs_in_flight
2196 * On the MDC client, to avoid a potential deadlock (see Bugzilla 3462),
2197 * one close request is allowed above the maximum.
2199 static inline bool obd_mod_rpc_slot_avail_locked(struct client_obd *cli,
2204 /* A slot is available if
2205 * - number of modify RPCs in flight is less than the max
2206 * - it's a close RPC and no other close request is in flight
2208 avail = cli->cl_mod_rpcs_in_flight < cli->cl_max_mod_rpcs_in_flight ||
2209 (close_req && cli->cl_close_rpcs_in_flight == 0);
2214 static inline bool obd_mod_rpc_slot_avail(struct client_obd *cli,
2219 spin_lock(&cli->cl_mod_rpcs_lock);
2220 avail = obd_mod_rpc_slot_avail_locked(cli, close_req);
2221 spin_unlock(&cli->cl_mod_rpcs_lock);
2225 /* Get a modify RPC slot from the obd client @cli according
2226 * to the kind of operation @opc that is going to be sent
2227 * and the intent @it of the operation if it applies.
2228 * If the maximum number of modify RPCs in flight is reached
2229 * the thread is put to sleep.
2230 * Returns the tag to be set in the request message. Tag 0
2231 * is reserved for non-modifying requests.
2233 __u16 obd_get_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2234 struct lookup_intent *it)
2236 struct l_wait_info lwi = LWI_INTR(NULL, NULL);
2237 bool close_req = false;
2240 /* read-only metadata RPCs don't consume a slot on MDT
2241 * for reply reconstruction
2243 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2244 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2247 if (opc == MDS_CLOSE)
2251 spin_lock(&cli->cl_mod_rpcs_lock);
2252 max = cli->cl_max_mod_rpcs_in_flight;
2253 if (obd_mod_rpc_slot_avail_locked(cli, close_req)) {
2254 /* there is a slot available */
2255 cli->cl_mod_rpcs_in_flight++;
2257 cli->cl_close_rpcs_in_flight++;
2258 lprocfs_oh_tally(&cli->cl_mod_rpcs_hist,
2259 cli->cl_mod_rpcs_in_flight);
2260 /* find a free tag */
2261 i = find_first_zero_bit(cli->cl_mod_tag_bitmap,
2263 LASSERT(i < OBD_MAX_RIF_MAX);
2264 LASSERT(!test_and_set_bit(i, cli->cl_mod_tag_bitmap));
2265 spin_unlock(&cli->cl_mod_rpcs_lock);
2266 /* tag 0 is reserved for non-modify RPCs */
2269 spin_unlock(&cli->cl_mod_rpcs_lock);
2271 CDEBUG(D_RPCTRACE, "%s: sleeping for a modify RPC slot "
2272 "opc %u, max %hu\n",
2273 cli->cl_import->imp_obd->obd_name, opc, max);
2275 l_wait_event(cli->cl_mod_rpcs_waitq,
2276 obd_mod_rpc_slot_avail(cli, close_req), &lwi);
2279 EXPORT_SYMBOL(obd_get_mod_rpc_slot);
2281 /* Put a modify RPC slot from the obd client @cli according
2282 * to the kind of operation @opc that has been sent and the
2283 * intent @it of the operation if it applies.
2285 void obd_put_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2286 struct lookup_intent *it, __u16 tag)
2288 bool close_req = false;
2290 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2291 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2294 if (opc == MDS_CLOSE)
2297 spin_lock(&cli->cl_mod_rpcs_lock);
2298 cli->cl_mod_rpcs_in_flight--;
2300 cli->cl_close_rpcs_in_flight--;
2301 /* release the tag in the bitmap */
2302 LASSERT(tag - 1 < OBD_MAX_RIF_MAX);
2303 LASSERT(test_and_clear_bit(tag - 1, cli->cl_mod_tag_bitmap) != 0);
2304 spin_unlock(&cli->cl_mod_rpcs_lock);
2305 wake_up(&cli->cl_mod_rpcs_waitq);
2307 EXPORT_SYMBOL(obd_put_mod_rpc_slot);