4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/genops.c
38 * These are the only exported functions, they provide some generic
39 * infrastructure for managing object devices
42 #define DEBUG_SUBSYSTEM S_CLASS
44 #include <linux/kthread.h>
45 #include <obd_class.h>
46 #include <lprocfs_status.h>
47 #include <lustre_disk.h>
48 #include <lustre_kernelcomm.h>
50 spinlock_t obd_types_lock;
52 static struct kmem_cache *obd_device_cachep;
53 struct kmem_cache *obdo_cachep;
54 EXPORT_SYMBOL(obdo_cachep);
55 static struct kmem_cache *import_cachep;
57 static struct list_head obd_zombie_imports;
58 static struct list_head obd_zombie_exports;
59 static spinlock_t obd_zombie_impexp_lock;
61 static void obd_zombie_impexp_notify(void);
62 static void obd_zombie_export_add(struct obd_export *exp);
63 static void obd_zombie_import_add(struct obd_import *imp);
64 static void print_export_data(struct obd_export *exp,
65 const char *status, int locks);
67 struct list_head obd_stale_exports;
68 spinlock_t obd_stale_export_lock;
69 atomic_t obd_stale_export_num;
71 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
72 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
75 * support functions: we could use inter-module communication, but this
76 * is more portable to other OS's
78 static struct obd_device *obd_device_alloc(void)
80 struct obd_device *obd;
82 OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, GFP_NOFS);
84 obd->obd_magic = OBD_DEVICE_MAGIC;
89 static void obd_device_free(struct obd_device *obd)
92 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
93 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
94 if (obd->obd_namespace != NULL) {
95 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
96 obd, obd->obd_namespace, obd->obd_force);
99 lu_ref_fini(&obd->obd_reference);
100 OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
103 struct obd_type *class_search_type(const char *name)
105 struct list_head *tmp;
106 struct obd_type *type;
108 spin_lock(&obd_types_lock);
109 list_for_each(tmp, &obd_types) {
110 type = list_entry(tmp, struct obd_type, typ_chain);
111 if (strcmp(type->typ_name, name) == 0) {
112 spin_unlock(&obd_types_lock);
116 spin_unlock(&obd_types_lock);
119 EXPORT_SYMBOL(class_search_type);
121 struct obd_type *class_get_type(const char *name)
123 struct obd_type *type = class_search_type(name);
125 #ifdef HAVE_MODULE_LOADING_SUPPORT
127 const char *modname = name;
129 if (strcmp(modname, "obdfilter") == 0)
132 if (strcmp(modname, LUSTRE_LWP_NAME) == 0)
133 modname = LUSTRE_OSP_NAME;
135 if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME)))
136 modname = LUSTRE_MDT_NAME;
138 if (!request_module("%s", modname)) {
139 CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
140 type = class_search_type(name);
142 LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
148 spin_lock(&type->obd_type_lock);
150 try_module_get(type->typ_dt_ops->o_owner);
151 spin_unlock(&type->obd_type_lock);
156 void class_put_type(struct obd_type *type)
159 spin_lock(&type->obd_type_lock);
161 module_put(type->typ_dt_ops->o_owner);
162 spin_unlock(&type->obd_type_lock);
165 #define CLASS_MAX_NAME 1024
167 int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
168 bool enable_proc, struct lprocfs_vars *vars,
169 const char *name, struct lu_device_type *ldt)
171 struct obd_type *type;
176 LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
178 if (class_search_type(name)) {
179 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
184 OBD_ALLOC(type, sizeof(*type));
188 OBD_ALLOC_PTR(type->typ_dt_ops);
189 OBD_ALLOC_PTR(type->typ_md_ops);
190 OBD_ALLOC(type->typ_name, strlen(name) + 1);
192 if (type->typ_dt_ops == NULL ||
193 type->typ_md_ops == NULL ||
194 type->typ_name == NULL)
197 *(type->typ_dt_ops) = *dt_ops;
198 /* md_ops is optional */
200 *(type->typ_md_ops) = *md_ops;
201 strcpy(type->typ_name, name);
202 spin_lock_init(&type->obd_type_lock);
204 #ifdef CONFIG_PROC_FS
206 type->typ_procroot = lprocfs_register(type->typ_name,
209 if (IS_ERR(type->typ_procroot)) {
210 rc = PTR_ERR(type->typ_procroot);
211 type->typ_procroot = NULL;
218 rc = lu_device_type_init(ldt);
223 spin_lock(&obd_types_lock);
224 list_add(&type->typ_chain, &obd_types);
225 spin_unlock(&obd_types_lock);
230 if (type->typ_name != NULL) {
231 #ifdef CONFIG_PROC_FS
232 if (type->typ_procroot != NULL)
233 remove_proc_subtree(type->typ_name, proc_lustre_root);
235 OBD_FREE(type->typ_name, strlen(name) + 1);
237 if (type->typ_md_ops != NULL)
238 OBD_FREE_PTR(type->typ_md_ops);
239 if (type->typ_dt_ops != NULL)
240 OBD_FREE_PTR(type->typ_dt_ops);
241 OBD_FREE(type, sizeof(*type));
244 EXPORT_SYMBOL(class_register_type);
246 int class_unregister_type(const char *name)
248 struct obd_type *type = class_search_type(name);
252 CERROR("unknown obd type\n");
256 if (type->typ_refcnt) {
257 CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt);
258 /* This is a bad situation, let's make the best of it */
259 /* Remove ops, but leave the name for debugging */
260 OBD_FREE_PTR(type->typ_dt_ops);
261 OBD_FREE_PTR(type->typ_md_ops);
265 /* we do not use type->typ_procroot as for compatibility purposes
266 * other modules can share names (i.e. lod can use lov entry). so
267 * we can't reference pointer as it can get invalided when another
268 * module removes the entry */
269 #ifdef CONFIG_PROC_FS
270 if (type->typ_procroot != NULL)
271 remove_proc_subtree(type->typ_name, proc_lustre_root);
272 if (type->typ_procsym != NULL)
273 lprocfs_remove(&type->typ_procsym);
276 lu_device_type_fini(type->typ_lu);
278 spin_lock(&obd_types_lock);
279 list_del(&type->typ_chain);
280 spin_unlock(&obd_types_lock);
281 OBD_FREE(type->typ_name, strlen(name) + 1);
282 if (type->typ_dt_ops != NULL)
283 OBD_FREE_PTR(type->typ_dt_ops);
284 if (type->typ_md_ops != NULL)
285 OBD_FREE_PTR(type->typ_md_ops);
286 OBD_FREE(type, sizeof(*type));
288 } /* class_unregister_type */
289 EXPORT_SYMBOL(class_unregister_type);
292 * Create a new obd device.
294 * Find an empty slot in ::obd_devs[], create a new obd device in it.
296 * \param[in] type_name obd device type string.
297 * \param[in] name obd device name.
299 * \retval NULL if create fails, otherwise return the obd device
302 struct obd_device *class_newdev(const char *type_name, const char *name)
304 struct obd_device *result = NULL;
305 struct obd_device *newdev;
306 struct obd_type *type = NULL;
308 int new_obd_minor = 0;
311 if (strlen(name) >= MAX_OBD_NAME) {
312 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
313 RETURN(ERR_PTR(-EINVAL));
316 type = class_get_type(type_name);
318 CERROR("OBD: unknown type: %s\n", type_name);
319 RETURN(ERR_PTR(-ENODEV));
322 newdev = obd_device_alloc();
324 GOTO(out_type, result = ERR_PTR(-ENOMEM));
326 LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
328 write_lock(&obd_dev_lock);
329 for (i = 0; i < class_devno_max(); i++) {
330 struct obd_device *obd = class_num2obd(i);
332 if (obd && (strcmp(name, obd->obd_name) == 0)) {
333 CERROR("Device %s already exists at %d, won't add\n",
336 LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
337 "%p obd_magic %08x != %08x\n", result,
338 result->obd_magic, OBD_DEVICE_MAGIC);
339 LASSERTF(result->obd_minor == new_obd_minor,
340 "%p obd_minor %d != %d\n", result,
341 result->obd_minor, new_obd_minor);
343 obd_devs[result->obd_minor] = NULL;
344 result->obd_name[0]='\0';
346 result = ERR_PTR(-EEXIST);
349 if (!result && !obd) {
351 result->obd_minor = i;
353 result->obd_type = type;
354 strncpy(result->obd_name, name,
355 sizeof(result->obd_name) - 1);
356 obd_devs[i] = result;
359 write_unlock(&obd_dev_lock);
361 if (result == NULL && i >= class_devno_max()) {
362 CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n",
364 GOTO(out, result = ERR_PTR(-EOVERFLOW));
370 CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
371 result->obd_name, result);
375 obd_device_free(newdev);
377 class_put_type(type);
381 void class_release_dev(struct obd_device *obd)
383 struct obd_type *obd_type = obd->obd_type;
385 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n",
386 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
387 LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
388 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
389 LASSERT(obd_type != NULL);
391 CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n",
392 obd->obd_name, obd->obd_minor, obd->obd_type->typ_name);
394 write_lock(&obd_dev_lock);
395 obd_devs[obd->obd_minor] = NULL;
396 write_unlock(&obd_dev_lock);
397 obd_device_free(obd);
399 class_put_type(obd_type);
402 int class_name2dev(const char *name)
409 read_lock(&obd_dev_lock);
410 for (i = 0; i < class_devno_max(); i++) {
411 struct obd_device *obd = class_num2obd(i);
413 if (obd && strcmp(name, obd->obd_name) == 0) {
414 /* Make sure we finished attaching before we give
415 out any references */
416 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
417 if (obd->obd_attached) {
418 read_unlock(&obd_dev_lock);
424 read_unlock(&obd_dev_lock);
429 struct obd_device *class_name2obd(const char *name)
431 int dev = class_name2dev(name);
433 if (dev < 0 || dev > class_devno_max())
435 return class_num2obd(dev);
437 EXPORT_SYMBOL(class_name2obd);
439 int class_uuid2dev(struct obd_uuid *uuid)
443 read_lock(&obd_dev_lock);
444 for (i = 0; i < class_devno_max(); i++) {
445 struct obd_device *obd = class_num2obd(i);
447 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
448 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
449 read_unlock(&obd_dev_lock);
453 read_unlock(&obd_dev_lock);
458 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
460 int dev = class_uuid2dev(uuid);
463 return class_num2obd(dev);
465 EXPORT_SYMBOL(class_uuid2obd);
468 * Get obd device from ::obd_devs[]
470 * \param num [in] array index
472 * \retval NULL if ::obd_devs[\a num] does not contains an obd device
473 * otherwise return the obd device there.
475 struct obd_device *class_num2obd(int num)
477 struct obd_device *obd = NULL;
479 if (num < class_devno_max()) {
484 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
485 "%p obd_magic %08x != %08x\n",
486 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
487 LASSERTF(obd->obd_minor == num,
488 "%p obd_minor %0d != %0d\n",
489 obd, obd->obd_minor, num);
496 * Get obd devices count. Device in any
498 * \retval obd device count
500 int get_devices_count(void)
502 int index, max_index = class_devno_max(), dev_count = 0;
504 read_lock(&obd_dev_lock);
505 for (index = 0; index <= max_index; index++) {
506 struct obd_device *obd = class_num2obd(index);
510 read_unlock(&obd_dev_lock);
514 EXPORT_SYMBOL(get_devices_count);
516 void class_obd_list(void)
521 read_lock(&obd_dev_lock);
522 for (i = 0; i < class_devno_max(); i++) {
523 struct obd_device *obd = class_num2obd(i);
527 if (obd->obd_stopping)
529 else if (obd->obd_set_up)
531 else if (obd->obd_attached)
535 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
536 i, status, obd->obd_type->typ_name,
537 obd->obd_name, obd->obd_uuid.uuid,
538 atomic_read(&obd->obd_refcount));
540 read_unlock(&obd_dev_lock);
544 /* Search for a client OBD connected to tgt_uuid. If grp_uuid is
545 specified, then only the client with that uuid is returned,
546 otherwise any client connected to the tgt is returned. */
547 struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid,
548 const char * typ_name,
549 struct obd_uuid *grp_uuid)
553 read_lock(&obd_dev_lock);
554 for (i = 0; i < class_devno_max(); i++) {
555 struct obd_device *obd = class_num2obd(i);
559 if ((strncmp(obd->obd_type->typ_name, typ_name,
560 strlen(typ_name)) == 0)) {
561 if (obd_uuid_equals(tgt_uuid,
562 &obd->u.cli.cl_target_uuid) &&
563 ((grp_uuid)? obd_uuid_equals(grp_uuid,
564 &obd->obd_uuid) : 1)) {
565 read_unlock(&obd_dev_lock);
570 read_unlock(&obd_dev_lock);
574 EXPORT_SYMBOL(class_find_client_obd);
576 /* Iterate the obd_device list looking devices have grp_uuid. Start
577 searching at *next, and if a device is found, the next index to look
578 at is saved in *next. If next is NULL, then the first matching device
579 will always be returned. */
580 struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
586 else if (*next >= 0 && *next < class_devno_max())
591 read_lock(&obd_dev_lock);
592 for (; i < class_devno_max(); i++) {
593 struct obd_device *obd = class_num2obd(i);
597 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
600 read_unlock(&obd_dev_lock);
604 read_unlock(&obd_dev_lock);
608 EXPORT_SYMBOL(class_devices_in_group);
611 * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
612 * adjust sptlrpc settings accordingly.
614 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
616 struct obd_device *obd;
620 LASSERT(namelen > 0);
622 read_lock(&obd_dev_lock);
623 for (i = 0; i < class_devno_max(); i++) {
624 obd = class_num2obd(i);
626 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
629 /* only notify mdc, osc, osp, lwp, mdt, ost
630 * because only these have a -sptlrpc llog */
631 type = obd->obd_type->typ_name;
632 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
633 strcmp(type, LUSTRE_OSC_NAME) != 0 &&
634 strcmp(type, LUSTRE_OSP_NAME) != 0 &&
635 strcmp(type, LUSTRE_LWP_NAME) != 0 &&
636 strcmp(type, LUSTRE_MDT_NAME) != 0 &&
637 strcmp(type, LUSTRE_OST_NAME) != 0)
640 if (strncmp(obd->obd_name, fsname, namelen))
643 class_incref(obd, __FUNCTION__, obd);
644 read_unlock(&obd_dev_lock);
645 rc2 = obd_set_info_async(NULL, obd->obd_self_export,
646 sizeof(KEY_SPTLRPC_CONF),
647 KEY_SPTLRPC_CONF, 0, NULL, NULL);
649 class_decref(obd, __FUNCTION__, obd);
650 read_lock(&obd_dev_lock);
652 read_unlock(&obd_dev_lock);
655 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
657 void obd_cleanup_caches(void)
660 if (obd_device_cachep) {
661 kmem_cache_destroy(obd_device_cachep);
662 obd_device_cachep = NULL;
665 kmem_cache_destroy(obdo_cachep);
669 kmem_cache_destroy(import_cachep);
670 import_cachep = NULL;
676 int obd_init_caches(void)
681 LASSERT(obd_device_cachep == NULL);
682 obd_device_cachep = kmem_cache_create("ll_obd_dev_cache",
683 sizeof(struct obd_device),
685 if (!obd_device_cachep)
686 GOTO(out, rc = -ENOMEM);
688 LASSERT(obdo_cachep == NULL);
689 obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo),
692 GOTO(out, rc = -ENOMEM);
694 LASSERT(import_cachep == NULL);
695 import_cachep = kmem_cache_create("ll_import_cache",
696 sizeof(struct obd_import),
699 GOTO(out, rc = -ENOMEM);
703 obd_cleanup_caches();
707 /* map connection to client */
708 struct obd_export *class_conn2export(struct lustre_handle *conn)
710 struct obd_export *export;
714 CDEBUG(D_CACHE, "looking for null handle\n");
718 if (conn->cookie == -1) { /* this means assign a new connection */
719 CDEBUG(D_CACHE, "want a new connection\n");
723 CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie);
724 export = class_handle2object(conn->cookie, NULL);
727 EXPORT_SYMBOL(class_conn2export);
729 struct obd_device *class_exp2obd(struct obd_export *exp)
735 EXPORT_SYMBOL(class_exp2obd);
737 struct obd_device *class_conn2obd(struct lustre_handle *conn)
739 struct obd_export *export;
740 export = class_conn2export(conn);
742 struct obd_device *obd = export->exp_obd;
743 class_export_put(export);
749 struct obd_import *class_exp2cliimp(struct obd_export *exp)
751 struct obd_device *obd = exp->exp_obd;
754 return obd->u.cli.cl_import;
756 EXPORT_SYMBOL(class_exp2cliimp);
758 struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
760 struct obd_device *obd = class_conn2obd(conn);
763 return obd->u.cli.cl_import;
766 /* Export management functions */
767 static void class_export_destroy(struct obd_export *exp)
769 struct obd_device *obd = exp->exp_obd;
772 LASSERT_ATOMIC_ZERO(&exp->exp_refcount);
773 LASSERT(obd != NULL);
775 CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
776 exp->exp_client_uuid.uuid, obd->obd_name);
778 /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
779 if (exp->exp_connection)
780 ptlrpc_put_connection_superhack(exp->exp_connection);
782 LASSERT(list_empty(&exp->exp_outstanding_replies));
783 LASSERT(list_empty(&exp->exp_uncommitted_replies));
784 LASSERT(list_empty(&exp->exp_req_replay_queue));
785 LASSERT(list_empty(&exp->exp_hp_rpcs));
786 obd_destroy_export(exp);
787 class_decref(obd, "export", exp);
789 OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
793 static void export_handle_addref(void *export)
795 class_export_get(export);
798 static struct portals_handle_ops export_handle_ops = {
799 .hop_addref = export_handle_addref,
803 struct obd_export *class_export_get(struct obd_export *exp)
805 atomic_inc(&exp->exp_refcount);
806 CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
807 atomic_read(&exp->exp_refcount));
810 EXPORT_SYMBOL(class_export_get);
812 void class_export_put(struct obd_export *exp)
814 LASSERT(exp != NULL);
815 LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON);
816 CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
817 atomic_read(&exp->exp_refcount) - 1);
819 if (atomic_dec_and_test(&exp->exp_refcount)) {
820 LASSERT(!list_empty(&exp->exp_obd_chain));
821 LASSERT(list_empty(&exp->exp_stale_list));
822 CDEBUG(D_IOCTL, "final put %p/%s\n",
823 exp, exp->exp_client_uuid.uuid);
825 /* release nid stat refererence */
826 lprocfs_exp_cleanup(exp);
828 obd_zombie_export_add(exp);
831 EXPORT_SYMBOL(class_export_put);
833 /* Creates a new export, adds it to the hash table, and returns a
834 * pointer to it. The refcount is 2: one for the hash reference, and
835 * one for the pointer returned by this function. */
836 struct obd_export *class_new_export(struct obd_device *obd,
837 struct obd_uuid *cluuid)
839 struct obd_export *export;
840 struct cfs_hash *hash = NULL;
844 OBD_ALLOC_PTR(export);
846 return ERR_PTR(-ENOMEM);
848 export->exp_conn_cnt = 0;
849 export->exp_lock_hash = NULL;
850 export->exp_flock_hash = NULL;
851 atomic_set(&export->exp_refcount, 2);
852 atomic_set(&export->exp_rpc_count, 0);
853 atomic_set(&export->exp_cb_count, 0);
854 atomic_set(&export->exp_locks_count, 0);
855 #if LUSTRE_TRACKS_LOCK_EXP_REFS
856 INIT_LIST_HEAD(&export->exp_locks_list);
857 spin_lock_init(&export->exp_locks_list_guard);
859 atomic_set(&export->exp_replay_count, 0);
860 export->exp_obd = obd;
861 INIT_LIST_HEAD(&export->exp_outstanding_replies);
862 spin_lock_init(&export->exp_uncommitted_replies_lock);
863 INIT_LIST_HEAD(&export->exp_uncommitted_replies);
864 INIT_LIST_HEAD(&export->exp_req_replay_queue);
865 INIT_LIST_HEAD(&export->exp_handle.h_link);
866 INIT_LIST_HEAD(&export->exp_hp_rpcs);
867 INIT_LIST_HEAD(&export->exp_reg_rpcs);
868 class_handle_hash(&export->exp_handle, &export_handle_ops);
869 export->exp_last_request_time = cfs_time_current_sec();
870 spin_lock_init(&export->exp_lock);
871 spin_lock_init(&export->exp_rpc_lock);
872 INIT_HLIST_NODE(&export->exp_uuid_hash);
873 INIT_HLIST_NODE(&export->exp_nid_hash);
874 INIT_HLIST_NODE(&export->exp_gen_hash);
875 spin_lock_init(&export->exp_bl_list_lock);
876 INIT_LIST_HEAD(&export->exp_bl_list);
877 INIT_LIST_HEAD(&export->exp_stale_list);
879 export->exp_sp_peer = LUSTRE_SP_ANY;
880 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
881 export->exp_client_uuid = *cluuid;
882 obd_init_export(export);
884 spin_lock(&obd->obd_dev_lock);
885 /* shouldn't happen, but might race */
886 if (obd->obd_stopping)
887 GOTO(exit_unlock, rc = -ENODEV);
889 hash = cfs_hash_getref(obd->obd_uuid_hash);
891 GOTO(exit_unlock, rc = -ENODEV);
892 spin_unlock(&obd->obd_dev_lock);
894 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
895 rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash);
897 LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
898 obd->obd_name, cluuid->uuid, rc);
899 GOTO(exit_err, rc = -EALREADY);
903 at_init(&export->exp_bl_lock_at, obd_timeout, 0);
904 spin_lock(&obd->obd_dev_lock);
905 if (obd->obd_stopping) {
906 cfs_hash_del(hash, cluuid, &export->exp_uuid_hash);
907 GOTO(exit_unlock, rc = -ENODEV);
910 class_incref(obd, "export", export);
911 list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
912 list_add_tail(&export->exp_obd_chain_timed,
913 &export->exp_obd->obd_exports_timed);
914 export->exp_obd->obd_num_exports++;
915 spin_unlock(&obd->obd_dev_lock);
916 cfs_hash_putref(hash);
920 spin_unlock(&obd->obd_dev_lock);
923 cfs_hash_putref(hash);
924 class_handle_unhash(&export->exp_handle);
925 LASSERT(hlist_unhashed(&export->exp_uuid_hash));
926 obd_destroy_export(export);
927 OBD_FREE_PTR(export);
930 EXPORT_SYMBOL(class_new_export);
932 void class_unlink_export(struct obd_export *exp)
934 class_handle_unhash(&exp->exp_handle);
936 spin_lock(&exp->exp_obd->obd_dev_lock);
937 /* delete an uuid-export hashitem from hashtables */
938 if (!hlist_unhashed(&exp->exp_uuid_hash))
939 cfs_hash_del(exp->exp_obd->obd_uuid_hash,
940 &exp->exp_client_uuid,
941 &exp->exp_uuid_hash);
943 if (!hlist_unhashed(&exp->exp_gen_hash)) {
944 struct tg_export_data *ted = &exp->exp_target_data;
945 struct cfs_hash *hash;
947 hash = cfs_hash_getref(exp->exp_obd->obd_gen_hash);
948 cfs_hash_del(hash, &ted->ted_lcd->lcd_generation,
950 cfs_hash_putref(hash);
953 list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
954 list_del_init(&exp->exp_obd_chain_timed);
955 exp->exp_obd->obd_num_exports--;
956 spin_unlock(&exp->exp_obd->obd_dev_lock);
957 atomic_inc(&obd_stale_export_num);
959 /* A reference is kept by obd_stale_exports list */
960 obd_stale_export_put(exp);
962 EXPORT_SYMBOL(class_unlink_export);
964 /* Import management functions */
965 static void class_import_destroy(struct obd_import *imp)
969 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
970 imp->imp_obd->obd_name);
972 LASSERT_ATOMIC_ZERO(&imp->imp_refcount);
974 ptlrpc_put_connection_superhack(imp->imp_connection);
976 while (!list_empty(&imp->imp_conn_list)) {
977 struct obd_import_conn *imp_conn;
979 imp_conn = list_entry(imp->imp_conn_list.next,
980 struct obd_import_conn, oic_item);
981 list_del_init(&imp_conn->oic_item);
982 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
983 OBD_FREE(imp_conn, sizeof(*imp_conn));
986 LASSERT(imp->imp_sec == NULL);
987 class_decref(imp->imp_obd, "import", imp);
988 OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
992 static void import_handle_addref(void *import)
994 class_import_get(import);
997 static struct portals_handle_ops import_handle_ops = {
998 .hop_addref = import_handle_addref,
1002 struct obd_import *class_import_get(struct obd_import *import)
1004 atomic_inc(&import->imp_refcount);
1005 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
1006 atomic_read(&import->imp_refcount),
1007 import->imp_obd->obd_name);
1010 EXPORT_SYMBOL(class_import_get);
1012 void class_import_put(struct obd_import *imp)
1016 LASSERT(list_empty(&imp->imp_zombie_chain));
1017 LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON);
1019 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
1020 atomic_read(&imp->imp_refcount) - 1,
1021 imp->imp_obd->obd_name);
1023 if (atomic_dec_and_test(&imp->imp_refcount)) {
1024 CDEBUG(D_INFO, "final put import %p\n", imp);
1025 obd_zombie_import_add(imp);
1028 /* catch possible import put race */
1029 LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON);
1032 EXPORT_SYMBOL(class_import_put);
1034 static void init_imp_at(struct imp_at *at) {
1036 at_init(&at->iat_net_latency, 0, 0);
1037 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1038 /* max service estimates are tracked on the server side, so
1039 don't use the AT history here, just use the last reported
1040 val. (But keep hist for proc histogram, worst_ever) */
1041 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
1046 struct obd_import *class_new_import(struct obd_device *obd)
1048 struct obd_import *imp;
1050 OBD_ALLOC(imp, sizeof(*imp));
1054 INIT_LIST_HEAD(&imp->imp_pinger_chain);
1055 INIT_LIST_HEAD(&imp->imp_zombie_chain);
1056 INIT_LIST_HEAD(&imp->imp_replay_list);
1057 INIT_LIST_HEAD(&imp->imp_sending_list);
1058 INIT_LIST_HEAD(&imp->imp_delayed_list);
1059 INIT_LIST_HEAD(&imp->imp_committed_list);
1060 imp->imp_replay_cursor = &imp->imp_committed_list;
1061 spin_lock_init(&imp->imp_lock);
1062 imp->imp_last_success_conn = 0;
1063 imp->imp_state = LUSTRE_IMP_NEW;
1064 imp->imp_obd = class_incref(obd, "import", imp);
1065 mutex_init(&imp->imp_sec_mutex);
1066 init_waitqueue_head(&imp->imp_recovery_waitq);
1068 atomic_set(&imp->imp_refcount, 2);
1069 atomic_set(&imp->imp_unregistering, 0);
1070 atomic_set(&imp->imp_inflight, 0);
1071 atomic_set(&imp->imp_replay_inflight, 0);
1072 atomic_set(&imp->imp_inval_count, 0);
1073 INIT_LIST_HEAD(&imp->imp_conn_list);
1074 INIT_LIST_HEAD(&imp->imp_handle.h_link);
1075 class_handle_hash(&imp->imp_handle, &import_handle_ops);
1076 init_imp_at(&imp->imp_at);
1078 /* the default magic is V2, will be used in connect RPC, and
1079 * then adjusted according to the flags in request/reply. */
1080 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
1084 EXPORT_SYMBOL(class_new_import);
1086 void class_destroy_import(struct obd_import *import)
1088 LASSERT(import != NULL);
1089 LASSERT(import != LP_POISON);
1091 class_handle_unhash(&import->imp_handle);
1093 spin_lock(&import->imp_lock);
1094 import->imp_generation++;
1095 spin_unlock(&import->imp_lock);
1096 class_import_put(import);
1098 EXPORT_SYMBOL(class_destroy_import);
1100 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1102 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1104 spin_lock(&exp->exp_locks_list_guard);
1106 LASSERT(lock->l_exp_refs_nr >= 0);
1108 if (lock->l_exp_refs_target != NULL &&
1109 lock->l_exp_refs_target != exp) {
1110 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1111 exp, lock, lock->l_exp_refs_target);
1113 if ((lock->l_exp_refs_nr ++) == 0) {
1114 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1115 lock->l_exp_refs_target = exp;
1117 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1118 lock, exp, lock->l_exp_refs_nr);
1119 spin_unlock(&exp->exp_locks_list_guard);
1122 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1124 spin_lock(&exp->exp_locks_list_guard);
1125 LASSERT(lock->l_exp_refs_nr > 0);
1126 if (lock->l_exp_refs_target != exp) {
1127 LCONSOLE_WARN("lock %p, "
1128 "mismatching export pointers: %p, %p\n",
1129 lock, lock->l_exp_refs_target, exp);
1131 if (-- lock->l_exp_refs_nr == 0) {
1132 list_del_init(&lock->l_exp_refs_link);
1133 lock->l_exp_refs_target = NULL;
1135 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1136 lock, exp, lock->l_exp_refs_nr);
1137 spin_unlock(&exp->exp_locks_list_guard);
1141 /* A connection defines an export context in which preallocation can
1142 be managed. This releases the export pointer reference, and returns
1143 the export handle, so the export refcount is 1 when this function
1145 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1146 struct obd_uuid *cluuid)
1148 struct obd_export *export;
1149 LASSERT(conn != NULL);
1150 LASSERT(obd != NULL);
1151 LASSERT(cluuid != NULL);
1154 export = class_new_export(obd, cluuid);
1156 RETURN(PTR_ERR(export));
1158 conn->cookie = export->exp_handle.h_cookie;
1159 class_export_put(export);
1161 CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1162 cluuid->uuid, conn->cookie);
1165 EXPORT_SYMBOL(class_connect);
1167 /* if export is involved in recovery then clean up related things */
1168 static void class_export_recovery_cleanup(struct obd_export *exp)
1170 struct obd_device *obd = exp->exp_obd;
1172 spin_lock(&obd->obd_recovery_task_lock);
1173 if (obd->obd_recovering) {
1174 if (exp->exp_in_recovery) {
1175 spin_lock(&exp->exp_lock);
1176 exp->exp_in_recovery = 0;
1177 spin_unlock(&exp->exp_lock);
1178 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1179 atomic_dec(&obd->obd_connected_clients);
1182 /* if called during recovery then should update
1183 * obd_stale_clients counter,
1184 * lightweight exports are not counted */
1185 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1186 exp->exp_obd->obd_stale_clients++;
1188 spin_unlock(&obd->obd_recovery_task_lock);
1190 spin_lock(&exp->exp_lock);
1191 /** Cleanup req replay fields */
1192 if (exp->exp_req_replay_needed) {
1193 exp->exp_req_replay_needed = 0;
1195 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1196 atomic_dec(&obd->obd_req_replay_clients);
1199 /** Cleanup lock replay data */
1200 if (exp->exp_lock_replay_needed) {
1201 exp->exp_lock_replay_needed = 0;
1203 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1204 atomic_dec(&obd->obd_lock_replay_clients);
1206 spin_unlock(&exp->exp_lock);
1209 /* This function removes 1-3 references from the export:
1210 * 1 - for export pointer passed
1211 * and if disconnect really need
1212 * 2 - removing from hash
1213 * 3 - in client_unlink_export
1214 * The export pointer passed to this function can destroyed */
1215 int class_disconnect(struct obd_export *export)
1217 int already_disconnected;
1220 if (export == NULL) {
1221 CWARN("attempting to free NULL export %p\n", export);
1225 spin_lock(&export->exp_lock);
1226 already_disconnected = export->exp_disconnected;
1227 export->exp_disconnected = 1;
1228 spin_unlock(&export->exp_lock);
1230 /* class_cleanup(), abort_recovery(), and class_fail_export()
1231 * all end up in here, and if any of them race we shouldn't
1232 * call extra class_export_puts(). */
1233 if (already_disconnected) {
1234 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1235 GOTO(no_disconn, already_disconnected);
1238 CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1239 export->exp_handle.h_cookie);
1241 if (!hlist_unhashed(&export->exp_nid_hash))
1242 cfs_hash_del(export->exp_obd->obd_nid_hash,
1243 &export->exp_connection->c_peer.nid,
1244 &export->exp_nid_hash);
1246 class_export_recovery_cleanup(export);
1247 class_unlink_export(export);
1249 class_export_put(export);
1252 EXPORT_SYMBOL(class_disconnect);
1254 /* Return non-zero for a fully connected export */
1255 int class_connected_export(struct obd_export *exp)
1260 spin_lock(&exp->exp_lock);
1261 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1262 spin_unlock(&exp->exp_lock);
1266 EXPORT_SYMBOL(class_connected_export);
1268 static void class_disconnect_export_list(struct list_head *list,
1269 enum obd_option flags)
1272 struct obd_export *exp;
1275 /* It's possible that an export may disconnect itself, but
1276 * nothing else will be added to this list. */
1277 while (!list_empty(list)) {
1278 exp = list_entry(list->next, struct obd_export,
1280 /* need for safe call CDEBUG after obd_disconnect */
1281 class_export_get(exp);
1283 spin_lock(&exp->exp_lock);
1284 exp->exp_flags = flags;
1285 spin_unlock(&exp->exp_lock);
1287 if (obd_uuid_equals(&exp->exp_client_uuid,
1288 &exp->exp_obd->obd_uuid)) {
1290 "exp %p export uuid == obd uuid, don't discon\n",
1292 /* Need to delete this now so we don't end up pointing
1293 * to work_list later when this export is cleaned up. */
1294 list_del_init(&exp->exp_obd_chain);
1295 class_export_put(exp);
1299 class_export_get(exp);
1300 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1301 "last request at "CFS_TIME_T"\n",
1302 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1303 exp, exp->exp_last_request_time);
1304 /* release one export reference anyway */
1305 rc = obd_disconnect(exp);
1307 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1308 obd_export_nid2str(exp), exp, rc);
1309 class_export_put(exp);
1314 void class_disconnect_exports(struct obd_device *obd)
1316 struct list_head work_list;
1319 /* Move all of the exports from obd_exports to a work list, en masse. */
1320 INIT_LIST_HEAD(&work_list);
1321 spin_lock(&obd->obd_dev_lock);
1322 list_splice_init(&obd->obd_exports, &work_list);
1323 list_splice_init(&obd->obd_delayed_exports, &work_list);
1324 spin_unlock(&obd->obd_dev_lock);
1326 if (!list_empty(&work_list)) {
1327 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1328 "disconnecting them\n", obd->obd_minor, obd);
1329 class_disconnect_export_list(&work_list,
1330 exp_flags_from_obd(obd));
1332 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1333 obd->obd_minor, obd);
1336 EXPORT_SYMBOL(class_disconnect_exports);
1338 /* Remove exports that have not completed recovery.
1340 void class_disconnect_stale_exports(struct obd_device *obd,
1341 int (*test_export)(struct obd_export *))
1343 struct list_head work_list;
1344 struct obd_export *exp, *n;
1348 INIT_LIST_HEAD(&work_list);
1349 spin_lock(&obd->obd_dev_lock);
1350 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1352 /* don't count self-export as client */
1353 if (obd_uuid_equals(&exp->exp_client_uuid,
1354 &exp->exp_obd->obd_uuid))
1357 /* don't evict clients which have no slot in last_rcvd
1358 * (e.g. lightweight connection) */
1359 if (exp->exp_target_data.ted_lr_idx == -1)
1362 spin_lock(&exp->exp_lock);
1363 if (exp->exp_failed || test_export(exp)) {
1364 spin_unlock(&exp->exp_lock);
1367 exp->exp_failed = 1;
1368 spin_unlock(&exp->exp_lock);
1370 list_move(&exp->exp_obd_chain, &work_list);
1372 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1373 obd->obd_name, exp->exp_client_uuid.uuid,
1374 exp->exp_connection == NULL ? "<unknown>" :
1375 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1376 print_export_data(exp, "EVICTING", 0);
1378 spin_unlock(&obd->obd_dev_lock);
1381 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1382 obd->obd_name, evicted);
1384 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1385 OBD_OPT_ABORT_RECOV);
1388 EXPORT_SYMBOL(class_disconnect_stale_exports);
1390 void class_fail_export(struct obd_export *exp)
1392 int rc, already_failed;
1394 spin_lock(&exp->exp_lock);
1395 already_failed = exp->exp_failed;
1396 exp->exp_failed = 1;
1397 spin_unlock(&exp->exp_lock);
1399 if (already_failed) {
1400 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1401 exp, exp->exp_client_uuid.uuid);
1405 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1406 exp, exp->exp_client_uuid.uuid);
1408 if (obd_dump_on_timeout)
1409 libcfs_debug_dumplog();
1411 /* need for safe call CDEBUG after obd_disconnect */
1412 class_export_get(exp);
1414 /* Most callers into obd_disconnect are removing their own reference
1415 * (request, for example) in addition to the one from the hash table.
1416 * We don't have such a reference here, so make one. */
1417 class_export_get(exp);
1418 rc = obd_disconnect(exp);
1420 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1422 CDEBUG(D_HA, "disconnected export %p/%s\n",
1423 exp, exp->exp_client_uuid.uuid);
1424 class_export_put(exp);
1426 EXPORT_SYMBOL(class_fail_export);
1428 char *obd_export_nid2str(struct obd_export *exp)
1430 if (exp->exp_connection != NULL)
1431 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1435 EXPORT_SYMBOL(obd_export_nid2str);
1437 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1439 struct cfs_hash *nid_hash;
1440 struct obd_export *doomed_exp = NULL;
1441 int exports_evicted = 0;
1443 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1445 spin_lock(&obd->obd_dev_lock);
1446 /* umount has run already, so evict thread should leave
1447 * its task to umount thread now */
1448 if (obd->obd_stopping) {
1449 spin_unlock(&obd->obd_dev_lock);
1450 return exports_evicted;
1452 nid_hash = obd->obd_nid_hash;
1453 cfs_hash_getref(nid_hash);
1454 spin_unlock(&obd->obd_dev_lock);
1457 doomed_exp = cfs_hash_lookup(nid_hash, &nid_key);
1458 if (doomed_exp == NULL)
1461 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1462 "nid %s found, wanted nid %s, requested nid %s\n",
1463 obd_export_nid2str(doomed_exp),
1464 libcfs_nid2str(nid_key), nid);
1465 LASSERTF(doomed_exp != obd->obd_self_export,
1466 "self-export is hashed by NID?\n");
1468 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative "
1469 "request\n", obd->obd_name,
1470 obd_uuid2str(&doomed_exp->exp_client_uuid),
1471 obd_export_nid2str(doomed_exp));
1472 class_fail_export(doomed_exp);
1473 class_export_put(doomed_exp);
1476 cfs_hash_putref(nid_hash);
1478 if (!exports_evicted)
1479 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1480 obd->obd_name, nid);
1481 return exports_evicted;
1483 EXPORT_SYMBOL(obd_export_evict_by_nid);
1485 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1487 struct cfs_hash *uuid_hash;
1488 struct obd_export *doomed_exp = NULL;
1489 struct obd_uuid doomed_uuid;
1490 int exports_evicted = 0;
1492 spin_lock(&obd->obd_dev_lock);
1493 if (obd->obd_stopping) {
1494 spin_unlock(&obd->obd_dev_lock);
1495 return exports_evicted;
1497 uuid_hash = obd->obd_uuid_hash;
1498 cfs_hash_getref(uuid_hash);
1499 spin_unlock(&obd->obd_dev_lock);
1501 obd_str2uuid(&doomed_uuid, uuid);
1502 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1503 CERROR("%s: can't evict myself\n", obd->obd_name);
1504 cfs_hash_putref(uuid_hash);
1505 return exports_evicted;
1508 doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid);
1510 if (doomed_exp == NULL) {
1511 CERROR("%s: can't disconnect %s: no exports found\n",
1512 obd->obd_name, uuid);
1514 CWARN("%s: evicting %s at adminstrative request\n",
1515 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1516 class_fail_export(doomed_exp);
1517 class_export_put(doomed_exp);
1520 cfs_hash_putref(uuid_hash);
1522 return exports_evicted;
1525 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1526 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1529 static void print_export_data(struct obd_export *exp, const char *status,
1532 struct ptlrpc_reply_state *rs;
1533 struct ptlrpc_reply_state *first_reply = NULL;
1536 spin_lock(&exp->exp_lock);
1537 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1543 spin_unlock(&exp->exp_lock);
1545 CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1546 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1547 obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1548 atomic_read(&exp->exp_rpc_count),
1549 atomic_read(&exp->exp_cb_count),
1550 atomic_read(&exp->exp_locks_count),
1551 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1552 nreplies, first_reply, nreplies > 3 ? "..." : "",
1553 exp->exp_last_committed);
1554 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1555 if (locks && class_export_dump_hook != NULL)
1556 class_export_dump_hook(exp);
1560 void dump_exports(struct obd_device *obd, int locks)
1562 struct obd_export *exp;
1564 spin_lock(&obd->obd_dev_lock);
1565 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1566 print_export_data(exp, "ACTIVE", locks);
1567 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1568 print_export_data(exp, "UNLINKED", locks);
1569 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1570 print_export_data(exp, "DELAYED", locks);
1571 spin_unlock(&obd->obd_dev_lock);
1572 spin_lock(&obd_zombie_impexp_lock);
1573 list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1574 print_export_data(exp, "ZOMBIE", locks);
1575 spin_unlock(&obd_zombie_impexp_lock);
1578 void obd_exports_barrier(struct obd_device *obd)
1581 LASSERT(list_empty(&obd->obd_exports));
1582 spin_lock(&obd->obd_dev_lock);
1583 while (!list_empty(&obd->obd_unlinked_exports)) {
1584 spin_unlock(&obd->obd_dev_lock);
1585 set_current_state(TASK_UNINTERRUPTIBLE);
1586 schedule_timeout(cfs_time_seconds(waited));
1587 if (waited > 5 && IS_PO2(waited)) {
1588 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1589 "more than %d seconds. "
1590 "The obd refcount = %d. Is it stuck?\n",
1591 obd->obd_name, waited,
1592 atomic_read(&obd->obd_refcount));
1593 dump_exports(obd, 1);
1596 spin_lock(&obd->obd_dev_lock);
1598 spin_unlock(&obd->obd_dev_lock);
1600 EXPORT_SYMBOL(obd_exports_barrier);
1602 /* Total amount of zombies to be destroyed */
1603 static int zombies_count = 0;
1606 * kill zombie imports and exports
1608 void obd_zombie_impexp_cull(void)
1610 struct obd_import *import;
1611 struct obd_export *export;
1615 spin_lock(&obd_zombie_impexp_lock);
1618 if (!list_empty(&obd_zombie_imports)) {
1619 import = list_entry(obd_zombie_imports.next,
1622 list_del_init(&import->imp_zombie_chain);
1626 if (!list_empty(&obd_zombie_exports)) {
1627 export = list_entry(obd_zombie_exports.next,
1630 list_del_init(&export->exp_obd_chain);
1633 spin_unlock(&obd_zombie_impexp_lock);
1635 if (import != NULL) {
1636 class_import_destroy(import);
1637 spin_lock(&obd_zombie_impexp_lock);
1639 spin_unlock(&obd_zombie_impexp_lock);
1642 if (export != NULL) {
1643 class_export_destroy(export);
1644 spin_lock(&obd_zombie_impexp_lock);
1646 spin_unlock(&obd_zombie_impexp_lock);
1650 } while (import != NULL || export != NULL);
1654 static struct completion obd_zombie_start;
1655 static struct completion obd_zombie_stop;
1656 static unsigned long obd_zombie_flags;
1657 static wait_queue_head_t obd_zombie_waitq;
1658 static pid_t obd_zombie_pid;
1661 OBD_ZOMBIE_STOP = 0x0001,
1665 * check for work for kill zombie import/export thread.
1667 static int obd_zombie_impexp_check(void *arg)
1671 spin_lock(&obd_zombie_impexp_lock);
1672 rc = (zombies_count == 0) &&
1673 !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1674 spin_unlock(&obd_zombie_impexp_lock);
1680 * Add export to the obd_zombe thread and notify it.
1682 static void obd_zombie_export_add(struct obd_export *exp) {
1683 atomic_dec(&obd_stale_export_num);
1684 spin_lock(&exp->exp_obd->obd_dev_lock);
1685 LASSERT(!list_empty(&exp->exp_obd_chain));
1686 list_del_init(&exp->exp_obd_chain);
1687 spin_unlock(&exp->exp_obd->obd_dev_lock);
1688 spin_lock(&obd_zombie_impexp_lock);
1690 list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1691 spin_unlock(&obd_zombie_impexp_lock);
1693 obd_zombie_impexp_notify();
1697 * Add import to the obd_zombe thread and notify it.
1699 static void obd_zombie_import_add(struct obd_import *imp) {
1700 LASSERT(imp->imp_sec == NULL);
1701 spin_lock(&obd_zombie_impexp_lock);
1702 LASSERT(list_empty(&imp->imp_zombie_chain));
1704 list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1705 spin_unlock(&obd_zombie_impexp_lock);
1707 obd_zombie_impexp_notify();
1711 * notify import/export destroy thread about new zombie.
1713 static void obd_zombie_impexp_notify(void)
1716 * Make sure obd_zomebie_impexp_thread get this notification.
1717 * It is possible this signal only get by obd_zombie_barrier, and
1718 * barrier gulps this notification and sleeps away and hangs ensues
1720 wake_up_all(&obd_zombie_waitq);
1724 * check whether obd_zombie is idle
1726 static int obd_zombie_is_idle(void)
1730 LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1731 spin_lock(&obd_zombie_impexp_lock);
1732 rc = (zombies_count == 0);
1733 spin_unlock(&obd_zombie_impexp_lock);
1738 * wait when obd_zombie import/export queues become empty
1740 void obd_zombie_barrier(void)
1742 struct l_wait_info lwi = { 0 };
1744 if (obd_zombie_pid == current_pid())
1745 /* don't wait for myself */
1747 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1749 EXPORT_SYMBOL(obd_zombie_barrier);
1752 struct obd_export *obd_stale_export_get(void)
1754 struct obd_export *exp = NULL;
1757 spin_lock(&obd_stale_export_lock);
1758 if (!list_empty(&obd_stale_exports)) {
1759 exp = list_entry(obd_stale_exports.next,
1760 struct obd_export, exp_stale_list);
1761 list_del_init(&exp->exp_stale_list);
1763 spin_unlock(&obd_stale_export_lock);
1766 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1767 atomic_read(&obd_stale_export_num));
1771 EXPORT_SYMBOL(obd_stale_export_get);
1773 void obd_stale_export_put(struct obd_export *exp)
1777 LASSERT(list_empty(&exp->exp_stale_list));
1778 if (exp->exp_lock_hash &&
1779 atomic_read(&exp->exp_lock_hash->hs_count)) {
1780 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1781 atomic_read(&obd_stale_export_num));
1783 spin_lock_bh(&exp->exp_bl_list_lock);
1784 spin_lock(&obd_stale_export_lock);
1785 /* Add to the tail if there is no blocked locks,
1786 * to the head otherwise. */
1787 if (list_empty(&exp->exp_bl_list))
1788 list_add_tail(&exp->exp_stale_list,
1789 &obd_stale_exports);
1791 list_add(&exp->exp_stale_list,
1792 &obd_stale_exports);
1794 spin_unlock(&obd_stale_export_lock);
1795 spin_unlock_bh(&exp->exp_bl_list_lock);
1797 class_export_put(exp);
1801 EXPORT_SYMBOL(obd_stale_export_put);
1804 * Adjust the position of the export in the stale list,
1805 * i.e. move to the head of the list if is needed.
1807 void obd_stale_export_adjust(struct obd_export *exp)
1809 LASSERT(exp != NULL);
1810 spin_lock_bh(&exp->exp_bl_list_lock);
1811 spin_lock(&obd_stale_export_lock);
1813 if (!list_empty(&exp->exp_stale_list) &&
1814 !list_empty(&exp->exp_bl_list))
1815 list_move(&exp->exp_stale_list, &obd_stale_exports);
1817 spin_unlock(&obd_stale_export_lock);
1818 spin_unlock_bh(&exp->exp_bl_list_lock);
1820 EXPORT_SYMBOL(obd_stale_export_adjust);
1823 * destroy zombie export/import thread.
1825 static int obd_zombie_impexp_thread(void *unused)
1827 unshare_fs_struct();
1828 complete(&obd_zombie_start);
1830 obd_zombie_pid = current_pid();
1832 while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1833 struct l_wait_info lwi = { 0 };
1835 l_wait_event(obd_zombie_waitq,
1836 !obd_zombie_impexp_check(NULL), &lwi);
1837 obd_zombie_impexp_cull();
1840 * Notify obd_zombie_barrier callers that queues
1843 wake_up(&obd_zombie_waitq);
1846 complete(&obd_zombie_stop);
1853 * start destroy zombie import/export thread
1855 int obd_zombie_impexp_init(void)
1857 struct task_struct *task;
1859 INIT_LIST_HEAD(&obd_zombie_imports);
1861 INIT_LIST_HEAD(&obd_zombie_exports);
1862 spin_lock_init(&obd_zombie_impexp_lock);
1863 init_completion(&obd_zombie_start);
1864 init_completion(&obd_zombie_stop);
1865 init_waitqueue_head(&obd_zombie_waitq);
1868 task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
1870 RETURN(PTR_ERR(task));
1872 wait_for_completion(&obd_zombie_start);
1876 * stop destroy zombie import/export thread
1878 void obd_zombie_impexp_stop(void)
1880 set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1881 obd_zombie_impexp_notify();
1882 wait_for_completion(&obd_zombie_stop);
1885 /***** Kernel-userspace comm helpers *******/
1887 /* Get length of entire message, including header */
1888 int kuc_len(int payload_len)
1890 return sizeof(struct kuc_hdr) + payload_len;
1892 EXPORT_SYMBOL(kuc_len);
1894 /* Get a pointer to kuc header, given a ptr to the payload
1895 * @param p Pointer to payload area
1896 * @returns Pointer to kuc header
1898 struct kuc_hdr * kuc_ptr(void *p)
1900 struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
1901 LASSERT(lh->kuc_magic == KUC_MAGIC);
1904 EXPORT_SYMBOL(kuc_ptr);
1906 /* Test if payload is part of kuc message
1907 * @param p Pointer to payload area
1910 int kuc_ispayload(void *p)
1912 struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1;
1914 if (kh->kuc_magic == KUC_MAGIC)
1919 EXPORT_SYMBOL(kuc_ispayload);
1921 /* Alloc space for a message, and fill in header
1922 * @return Pointer to payload area
1924 void *kuc_alloc(int payload_len, int transport, int type)
1927 int len = kuc_len(payload_len);
1931 return ERR_PTR(-ENOMEM);
1933 lh->kuc_magic = KUC_MAGIC;
1934 lh->kuc_transport = transport;
1935 lh->kuc_msgtype = type;
1936 lh->kuc_msglen = len;
1938 return (void *)(lh + 1);
1940 EXPORT_SYMBOL(kuc_alloc);
1942 /* Takes pointer to payload area */
1943 inline void kuc_free(void *p, int payload_len)
1945 struct kuc_hdr *lh = kuc_ptr(p);
1946 OBD_FREE(lh, kuc_len(payload_len));
1948 EXPORT_SYMBOL(kuc_free);
1950 struct obd_request_slot_waiter {
1951 struct list_head orsw_entry;
1952 wait_queue_head_t orsw_waitq;
1956 static bool obd_request_slot_avail(struct client_obd *cli,
1957 struct obd_request_slot_waiter *orsw)
1961 spin_lock(&cli->cl_loi_list_lock);
1962 avail = !!list_empty(&orsw->orsw_entry);
1963 spin_unlock(&cli->cl_loi_list_lock);
1969 * For network flow control, the RPC sponsor needs to acquire a credit
1970 * before sending the RPC. The credits count for a connection is defined
1971 * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
1972 * the subsequent RPC sponsors need to wait until others released their
1973 * credits, or the administrator increased the "cl_max_rpcs_in_flight".
1975 int obd_get_request_slot(struct client_obd *cli)
1977 struct obd_request_slot_waiter orsw;
1978 struct l_wait_info lwi;
1981 spin_lock(&cli->cl_loi_list_lock);
1982 if (cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight) {
1983 cli->cl_r_in_flight++;
1984 spin_unlock(&cli->cl_loi_list_lock);
1988 init_waitqueue_head(&orsw.orsw_waitq);
1989 list_add_tail(&orsw.orsw_entry, &cli->cl_loi_read_list);
1990 orsw.orsw_signaled = false;
1991 spin_unlock(&cli->cl_loi_list_lock);
1993 lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1994 rc = l_wait_event(orsw.orsw_waitq,
1995 obd_request_slot_avail(cli, &orsw) ||
1999 /* Here, we must take the lock to avoid the on-stack 'orsw' to be
2000 * freed but other (such as obd_put_request_slot) is using it. */
2001 spin_lock(&cli->cl_loi_list_lock);
2003 if (!orsw.orsw_signaled) {
2004 if (list_empty(&orsw.orsw_entry))
2005 cli->cl_r_in_flight--;
2007 list_del(&orsw.orsw_entry);
2011 if (orsw.orsw_signaled) {
2012 LASSERT(list_empty(&orsw.orsw_entry));
2016 spin_unlock(&cli->cl_loi_list_lock);
2020 EXPORT_SYMBOL(obd_get_request_slot);
2022 void obd_put_request_slot(struct client_obd *cli)
2024 struct obd_request_slot_waiter *orsw;
2026 spin_lock(&cli->cl_loi_list_lock);
2027 cli->cl_r_in_flight--;
2029 /* If there is free slot, wakeup the first waiter. */
2030 if (!list_empty(&cli->cl_loi_read_list) &&
2031 likely(cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight)) {
2032 orsw = list_entry(cli->cl_loi_read_list.next,
2033 struct obd_request_slot_waiter, orsw_entry);
2034 list_del_init(&orsw->orsw_entry);
2035 cli->cl_r_in_flight++;
2036 wake_up(&orsw->orsw_waitq);
2038 spin_unlock(&cli->cl_loi_list_lock);
2040 EXPORT_SYMBOL(obd_put_request_slot);
2042 __u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
2044 return cli->cl_max_rpcs_in_flight;
2046 EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
2048 int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
2050 struct obd_request_slot_waiter *orsw;
2057 if (max > OBD_MAX_RIF_MAX || max < 1)
2060 typ_name = cli->cl_import->imp_obd->obd_type->typ_name;
2061 if (strcmp(typ_name, LUSTRE_MDC_NAME) == 0) {
2062 /* adjust max_mod_rpcs_in_flight to ensure it is always
2063 * strictly lower that max_rpcs_in_flight */
2065 CERROR("%s: cannot set max_rpcs_in_flight to 1 "
2066 "because it must be higher than "
2067 "max_mod_rpcs_in_flight value",
2068 cli->cl_import->imp_obd->obd_name);
2071 if (max <= cli->cl_max_mod_rpcs_in_flight) {
2072 rc = obd_set_max_mod_rpcs_in_flight(cli, max - 1);
2078 spin_lock(&cli->cl_loi_list_lock);
2079 old = cli->cl_max_rpcs_in_flight;
2080 cli->cl_max_rpcs_in_flight = max;
2083 /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
2084 for (i = 0; i < diff; i++) {
2085 if (list_empty(&cli->cl_loi_read_list))
2088 orsw = list_entry(cli->cl_loi_read_list.next,
2089 struct obd_request_slot_waiter, orsw_entry);
2090 list_del_init(&orsw->orsw_entry);
2091 cli->cl_r_in_flight++;
2092 wake_up(&orsw->orsw_waitq);
2094 spin_unlock(&cli->cl_loi_list_lock);
2098 EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
2100 __u16 obd_get_max_mod_rpcs_in_flight(struct client_obd *cli)
2102 return cli->cl_max_mod_rpcs_in_flight;
2104 EXPORT_SYMBOL(obd_get_max_mod_rpcs_in_flight);
2106 int obd_set_max_mod_rpcs_in_flight(struct client_obd *cli, __u16 max)
2108 struct obd_connect_data *ocd;
2112 if (max > OBD_MAX_RIF_MAX || max < 1)
2115 /* cannot exceed or equal max_rpcs_in_flight */
2116 if (max >= cli->cl_max_rpcs_in_flight) {
2117 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2118 "higher or equal to max_rpcs_in_flight value (%u)\n",
2119 cli->cl_import->imp_obd->obd_name,
2120 max, cli->cl_max_rpcs_in_flight);
2124 /* cannot exceed max modify RPCs in flight supported by the server */
2125 ocd = &cli->cl_import->imp_connect_data;
2126 if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS)
2127 maxmodrpcs = ocd->ocd_maxmodrpcs;
2130 if (max > maxmodrpcs) {
2131 CERROR("%s: can't set max_mod_rpcs_in_flight to a value (%hu) "
2132 "higher than max_mod_rpcs_per_client value (%hu) "
2133 "returned by the server at connection\n",
2134 cli->cl_import->imp_obd->obd_name,
2139 spin_lock(&cli->cl_mod_rpcs_lock);
2141 prev = cli->cl_max_mod_rpcs_in_flight;
2142 cli->cl_max_mod_rpcs_in_flight = max;
2144 /* wakeup waiters if limit has been increased */
2145 if (cli->cl_max_mod_rpcs_in_flight > prev)
2146 wake_up(&cli->cl_mod_rpcs_waitq);
2148 spin_unlock(&cli->cl_mod_rpcs_lock);
2152 EXPORT_SYMBOL(obd_set_max_mod_rpcs_in_flight);
2155 #define pct(a, b) (b ? a * 100 / b : 0)
2156 int obd_mod_rpc_stats_seq_show(struct client_obd *cli,
2157 struct seq_file *seq)
2160 unsigned long mod_tot = 0, mod_cum;
2163 do_gettimeofday(&now);
2165 spin_lock(&cli->cl_mod_rpcs_lock);
2167 seq_printf(seq, "snapshot_time: %lu.%lu (secs.usecs)\n",
2168 now.tv_sec, now.tv_usec);
2169 seq_printf(seq, "modify_RPCs_in_flight: %hu\n",
2170 cli->cl_mod_rpcs_in_flight);
2172 seq_printf(seq, "\n\t\t\tmodify\n");
2173 seq_printf(seq, "rpcs in flight rpcs %% cum %%\n");
2175 mod_tot = lprocfs_oh_sum(&cli->cl_mod_rpcs_hist);
2178 for (i = 0; i < OBD_HIST_MAX; i++) {
2179 unsigned long mod = cli->cl_mod_rpcs_hist.oh_buckets[i];
2181 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu\n",
2182 i, mod, pct(mod, mod_tot),
2183 pct(mod_cum, mod_tot));
2184 if (mod_cum == mod_tot)
2188 spin_unlock(&cli->cl_mod_rpcs_lock);
2192 EXPORT_SYMBOL(obd_mod_rpc_stats_seq_show);
2196 /* The number of modify RPCs sent in parallel is limited
2197 * because the server has a finite number of slots per client to
2198 * store request result and ensure reply reconstruction when needed.
2199 * On the client, this limit is stored in cl_max_mod_rpcs_in_flight
2200 * that takes into account server limit and cl_max_rpcs_in_flight
2202 * On the MDC client, to avoid a potential deadlock (see Bugzilla 3462),
2203 * one close request is allowed above the maximum.
2205 static inline bool obd_mod_rpc_slot_avail_locked(struct client_obd *cli,
2210 /* A slot is available if
2211 * - number of modify RPCs in flight is less than the max
2212 * - it's a close RPC and no other close request is in flight
2214 avail = cli->cl_mod_rpcs_in_flight < cli->cl_max_mod_rpcs_in_flight ||
2215 (close_req && cli->cl_close_rpcs_in_flight == 0);
2220 static inline bool obd_mod_rpc_slot_avail(struct client_obd *cli,
2225 spin_lock(&cli->cl_mod_rpcs_lock);
2226 avail = obd_mod_rpc_slot_avail_locked(cli, close_req);
2227 spin_unlock(&cli->cl_mod_rpcs_lock);
2231 /* Get a modify RPC slot from the obd client @cli according
2232 * to the kind of operation @opc that is going to be sent
2233 * and the intent @it of the operation if it applies.
2234 * If the maximum number of modify RPCs in flight is reached
2235 * the thread is put to sleep.
2236 * Returns the tag to be set in the request message. Tag 0
2237 * is reserved for non-modifying requests.
2239 __u16 obd_get_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2240 struct lookup_intent *it)
2242 struct l_wait_info lwi = LWI_INTR(NULL, NULL);
2243 bool close_req = false;
2246 /* read-only metadata RPCs don't consume a slot on MDT
2247 * for reply reconstruction
2249 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2250 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2253 if (opc == MDS_CLOSE)
2257 spin_lock(&cli->cl_mod_rpcs_lock);
2258 max = cli->cl_max_mod_rpcs_in_flight;
2259 if (obd_mod_rpc_slot_avail_locked(cli, close_req)) {
2260 /* there is a slot available */
2261 cli->cl_mod_rpcs_in_flight++;
2263 cli->cl_close_rpcs_in_flight++;
2264 lprocfs_oh_tally(&cli->cl_mod_rpcs_hist,
2265 cli->cl_mod_rpcs_in_flight);
2266 /* find a free tag */
2267 i = find_first_zero_bit(cli->cl_mod_tag_bitmap,
2269 LASSERT(i < OBD_MAX_RIF_MAX);
2270 LASSERT(!test_and_set_bit(i, cli->cl_mod_tag_bitmap));
2271 spin_unlock(&cli->cl_mod_rpcs_lock);
2272 /* tag 0 is reserved for non-modify RPCs */
2275 spin_unlock(&cli->cl_mod_rpcs_lock);
2277 CDEBUG(D_RPCTRACE, "%s: sleeping for a modify RPC slot "
2278 "opc %u, max %hu\n",
2279 cli->cl_import->imp_obd->obd_name, opc, max);
2281 l_wait_event(cli->cl_mod_rpcs_waitq,
2282 obd_mod_rpc_slot_avail(cli, close_req), &lwi);
2285 EXPORT_SYMBOL(obd_get_mod_rpc_slot);
2287 /* Put a modify RPC slot from the obd client @cli according
2288 * to the kind of operation @opc that has been sent and the
2289 * intent @it of the operation if it applies.
2291 void obd_put_mod_rpc_slot(struct client_obd *cli, __u32 opc,
2292 struct lookup_intent *it, __u16 tag)
2294 bool close_req = false;
2296 if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
2297 it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
2300 if (opc == MDS_CLOSE)
2303 spin_lock(&cli->cl_mod_rpcs_lock);
2304 cli->cl_mod_rpcs_in_flight--;
2306 cli->cl_close_rpcs_in_flight--;
2307 /* release the tag in the bitmap */
2308 LASSERT(tag - 1 < OBD_MAX_RIF_MAX);
2309 LASSERT(test_and_clear_bit(tag - 1, cli->cl_mod_tag_bitmap) != 0);
2310 spin_unlock(&cli->cl_mod_rpcs_lock);
2311 wake_up(&cli->cl_mod_rpcs_waitq);
2313 EXPORT_SYMBOL(obd_put_mod_rpc_slot);