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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/obdclass/genops.c
34 * These are the only exported functions, they provide some generic
35 * infrastructure for managing object devices
38 #define DEBUG_SUBSYSTEM S_CLASS
40 #include <linux/pid_namespace.h>
41 #include <linux/kthread.h>
42 #include <obd_class.h>
43 #include <lprocfs_status.h>
44 #include <lustre_disk.h>
45 #include <lustre_kernelcomm.h>
47 static DEFINE_SPINLOCK(obd_types_lock);
48 static LIST_HEAD(obd_types);
49 DEFINE_RWLOCK(obd_dev_lock);
50 static struct obd_device *obd_devs[MAX_OBD_DEVICES];
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 LIST_HEAD(obd_zombie_imports);
58 static LIST_HEAD(obd_zombie_exports);
59 static DEFINE_SPINLOCK(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 static LIST_HEAD(obd_stale_exports);
68 static DEFINE_SPINLOCK(obd_stale_export_lock);
69 static atomic_t obd_stale_export_num = ATOMIC_INIT(0);
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;
1052 struct pid_namespace *curr_pid_ns = ll_task_pid_ns(current);
1054 OBD_ALLOC(imp, sizeof(*imp));
1058 INIT_LIST_HEAD(&imp->imp_pinger_chain);
1059 INIT_LIST_HEAD(&imp->imp_zombie_chain);
1060 INIT_LIST_HEAD(&imp->imp_replay_list);
1061 INIT_LIST_HEAD(&imp->imp_sending_list);
1062 INIT_LIST_HEAD(&imp->imp_delayed_list);
1063 INIT_LIST_HEAD(&imp->imp_committed_list);
1064 INIT_LIST_HEAD(&imp->imp_unreplied_list);
1065 imp->imp_known_replied_xid = 0;
1066 imp->imp_replay_cursor = &imp->imp_committed_list;
1067 spin_lock_init(&imp->imp_lock);
1068 imp->imp_last_success_conn = 0;
1069 imp->imp_state = LUSTRE_IMP_NEW;
1070 imp->imp_obd = class_incref(obd, "import", imp);
1071 mutex_init(&imp->imp_sec_mutex);
1072 init_waitqueue_head(&imp->imp_recovery_waitq);
1074 if (curr_pid_ns->child_reaper)
1075 imp->imp_sec_refpid = curr_pid_ns->child_reaper->pid;
1077 imp->imp_sec_refpid = 1;
1079 atomic_set(&imp->imp_refcount, 2);
1080 atomic_set(&imp->imp_unregistering, 0);
1081 atomic_set(&imp->imp_inflight, 0);
1082 atomic_set(&imp->imp_replay_inflight, 0);
1083 atomic_set(&imp->imp_inval_count, 0);
1084 INIT_LIST_HEAD(&imp->imp_conn_list);
1085 INIT_LIST_HEAD(&imp->imp_handle.h_link);
1086 class_handle_hash(&imp->imp_handle, &import_handle_ops);
1087 init_imp_at(&imp->imp_at);
1089 /* the default magic is V2, will be used in connect RPC, and
1090 * then adjusted according to the flags in request/reply. */
1091 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
1095 EXPORT_SYMBOL(class_new_import);
1097 void class_destroy_import(struct obd_import *import)
1099 LASSERT(import != NULL);
1100 LASSERT(import != LP_POISON);
1102 class_handle_unhash(&import->imp_handle);
1104 spin_lock(&import->imp_lock);
1105 import->imp_generation++;
1106 spin_unlock(&import->imp_lock);
1107 class_import_put(import);
1109 EXPORT_SYMBOL(class_destroy_import);
1111 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1113 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1115 spin_lock(&exp->exp_locks_list_guard);
1117 LASSERT(lock->l_exp_refs_nr >= 0);
1119 if (lock->l_exp_refs_target != NULL &&
1120 lock->l_exp_refs_target != exp) {
1121 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1122 exp, lock, lock->l_exp_refs_target);
1124 if ((lock->l_exp_refs_nr ++) == 0) {
1125 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1126 lock->l_exp_refs_target = exp;
1128 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1129 lock, exp, lock->l_exp_refs_nr);
1130 spin_unlock(&exp->exp_locks_list_guard);
1132 EXPORT_SYMBOL(__class_export_add_lock_ref);
1134 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1136 spin_lock(&exp->exp_locks_list_guard);
1137 LASSERT(lock->l_exp_refs_nr > 0);
1138 if (lock->l_exp_refs_target != exp) {
1139 LCONSOLE_WARN("lock %p, "
1140 "mismatching export pointers: %p, %p\n",
1141 lock, lock->l_exp_refs_target, exp);
1143 if (-- lock->l_exp_refs_nr == 0) {
1144 list_del_init(&lock->l_exp_refs_link);
1145 lock->l_exp_refs_target = NULL;
1147 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1148 lock, exp, lock->l_exp_refs_nr);
1149 spin_unlock(&exp->exp_locks_list_guard);
1151 EXPORT_SYMBOL(__class_export_del_lock_ref);
1154 /* A connection defines an export context in which preallocation can
1155 be managed. This releases the export pointer reference, and returns
1156 the export handle, so the export refcount is 1 when this function
1158 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1159 struct obd_uuid *cluuid)
1161 struct obd_export *export;
1162 LASSERT(conn != NULL);
1163 LASSERT(obd != NULL);
1164 LASSERT(cluuid != NULL);
1167 export = class_new_export(obd, cluuid);
1169 RETURN(PTR_ERR(export));
1171 conn->cookie = export->exp_handle.h_cookie;
1172 class_export_put(export);
1174 CDEBUG(D_IOCTL, "connect: client %s, cookie %#llx\n",
1175 cluuid->uuid, conn->cookie);
1178 EXPORT_SYMBOL(class_connect);
1180 /* if export is involved in recovery then clean up related things */
1181 static void class_export_recovery_cleanup(struct obd_export *exp)
1183 struct obd_device *obd = exp->exp_obd;
1185 spin_lock(&obd->obd_recovery_task_lock);
1186 if (obd->obd_recovering) {
1187 if (exp->exp_in_recovery) {
1188 spin_lock(&exp->exp_lock);
1189 exp->exp_in_recovery = 0;
1190 spin_unlock(&exp->exp_lock);
1191 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1192 atomic_dec(&obd->obd_connected_clients);
1195 /* if called during recovery then should update
1196 * obd_stale_clients counter,
1197 * lightweight exports are not counted */
1198 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1199 exp->exp_obd->obd_stale_clients++;
1201 spin_unlock(&obd->obd_recovery_task_lock);
1203 spin_lock(&exp->exp_lock);
1204 /** Cleanup req replay fields */
1205 if (exp->exp_req_replay_needed) {
1206 exp->exp_req_replay_needed = 0;
1208 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1209 atomic_dec(&obd->obd_req_replay_clients);
1212 /** Cleanup lock replay data */
1213 if (exp->exp_lock_replay_needed) {
1214 exp->exp_lock_replay_needed = 0;
1216 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1217 atomic_dec(&obd->obd_lock_replay_clients);
1219 spin_unlock(&exp->exp_lock);
1222 /* This function removes 1-3 references from the export:
1223 * 1 - for export pointer passed
1224 * and if disconnect really need
1225 * 2 - removing from hash
1226 * 3 - in client_unlink_export
1227 * The export pointer passed to this function can destroyed */
1228 int class_disconnect(struct obd_export *export)
1230 int already_disconnected;
1233 if (export == NULL) {
1234 CWARN("attempting to free NULL export %p\n", export);
1238 spin_lock(&export->exp_lock);
1239 already_disconnected = export->exp_disconnected;
1240 export->exp_disconnected = 1;
1241 /* We hold references of export for uuid hash
1242 * and nid_hash and export link at least. So
1243 * it is safe to call cfs_hash_del in there. */
1244 if (!hlist_unhashed(&export->exp_nid_hash))
1245 cfs_hash_del(export->exp_obd->obd_nid_hash,
1246 &export->exp_connection->c_peer.nid,
1247 &export->exp_nid_hash);
1248 spin_unlock(&export->exp_lock);
1250 /* class_cleanup(), abort_recovery(), and class_fail_export()
1251 * all end up in here, and if any of them race we shouldn't
1252 * call extra class_export_puts(). */
1253 if (already_disconnected) {
1254 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1255 GOTO(no_disconn, already_disconnected);
1258 CDEBUG(D_IOCTL, "disconnect: cookie %#llx\n",
1259 export->exp_handle.h_cookie);
1261 class_export_recovery_cleanup(export);
1262 class_unlink_export(export);
1264 class_export_put(export);
1267 EXPORT_SYMBOL(class_disconnect);
1269 /* Return non-zero for a fully connected export */
1270 int class_connected_export(struct obd_export *exp)
1275 spin_lock(&exp->exp_lock);
1276 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1277 spin_unlock(&exp->exp_lock);
1281 EXPORT_SYMBOL(class_connected_export);
1283 static void class_disconnect_export_list(struct list_head *list,
1284 enum obd_option flags)
1287 struct obd_export *exp;
1290 /* It's possible that an export may disconnect itself, but
1291 * nothing else will be added to this list. */
1292 while (!list_empty(list)) {
1293 exp = list_entry(list->next, struct obd_export,
1295 /* need for safe call CDEBUG after obd_disconnect */
1296 class_export_get(exp);
1298 spin_lock(&exp->exp_lock);
1299 exp->exp_flags = flags;
1300 spin_unlock(&exp->exp_lock);
1302 if (obd_uuid_equals(&exp->exp_client_uuid,
1303 &exp->exp_obd->obd_uuid)) {
1305 "exp %p export uuid == obd uuid, don't discon\n",
1307 /* Need to delete this now so we don't end up pointing
1308 * to work_list later when this export is cleaned up. */
1309 list_del_init(&exp->exp_obd_chain);
1310 class_export_put(exp);
1314 class_export_get(exp);
1315 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1316 "last request at "CFS_TIME_T"\n",
1317 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1318 exp, exp->exp_last_request_time);
1319 /* release one export reference anyway */
1320 rc = obd_disconnect(exp);
1322 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1323 obd_export_nid2str(exp), exp, rc);
1324 class_export_put(exp);
1329 void class_disconnect_exports(struct obd_device *obd)
1331 struct list_head work_list;
1334 /* Move all of the exports from obd_exports to a work list, en masse. */
1335 INIT_LIST_HEAD(&work_list);
1336 spin_lock(&obd->obd_dev_lock);
1337 list_splice_init(&obd->obd_exports, &work_list);
1338 list_splice_init(&obd->obd_delayed_exports, &work_list);
1339 spin_unlock(&obd->obd_dev_lock);
1341 if (!list_empty(&work_list)) {
1342 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1343 "disconnecting them\n", obd->obd_minor, obd);
1344 class_disconnect_export_list(&work_list,
1345 exp_flags_from_obd(obd));
1347 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1348 obd->obd_minor, obd);
1351 EXPORT_SYMBOL(class_disconnect_exports);
1353 /* Remove exports that have not completed recovery.
1355 void class_disconnect_stale_exports(struct obd_device *obd,
1356 int (*test_export)(struct obd_export *))
1358 struct list_head work_list;
1359 struct obd_export *exp, *n;
1363 INIT_LIST_HEAD(&work_list);
1364 spin_lock(&obd->obd_dev_lock);
1365 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1367 /* don't count self-export as client */
1368 if (obd_uuid_equals(&exp->exp_client_uuid,
1369 &exp->exp_obd->obd_uuid))
1372 /* don't evict clients which have no slot in last_rcvd
1373 * (e.g. lightweight connection) */
1374 if (exp->exp_target_data.ted_lr_idx == -1)
1377 spin_lock(&exp->exp_lock);
1378 if (exp->exp_failed || test_export(exp)) {
1379 spin_unlock(&exp->exp_lock);
1382 exp->exp_failed = 1;
1383 spin_unlock(&exp->exp_lock);
1385 list_move(&exp->exp_obd_chain, &work_list);
1387 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1388 obd->obd_name, exp->exp_client_uuid.uuid,
1389 exp->exp_connection == NULL ? "<unknown>" :
1390 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1391 print_export_data(exp, "EVICTING", 0, D_HA);
1393 spin_unlock(&obd->obd_dev_lock);
1396 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1397 obd->obd_name, evicted);
1399 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1400 OBD_OPT_ABORT_RECOV);
1403 EXPORT_SYMBOL(class_disconnect_stale_exports);
1405 void class_fail_export(struct obd_export *exp)
1407 int rc, already_failed;
1409 spin_lock(&exp->exp_lock);
1410 already_failed = exp->exp_failed;
1411 exp->exp_failed = 1;
1412 spin_unlock(&exp->exp_lock);
1414 if (already_failed) {
1415 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1416 exp, exp->exp_client_uuid.uuid);
1420 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1421 exp, exp->exp_client_uuid.uuid);
1423 if (obd_dump_on_timeout)
1424 libcfs_debug_dumplog();
1426 /* need for safe call CDEBUG after obd_disconnect */
1427 class_export_get(exp);
1429 /* Most callers into obd_disconnect are removing their own reference
1430 * (request, for example) in addition to the one from the hash table.
1431 * We don't have such a reference here, so make one. */
1432 class_export_get(exp);
1433 rc = obd_disconnect(exp);
1435 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1437 CDEBUG(D_HA, "disconnected export %p/%s\n",
1438 exp, exp->exp_client_uuid.uuid);
1439 class_export_put(exp);
1441 EXPORT_SYMBOL(class_fail_export);
1443 char *obd_export_nid2str(struct obd_export *exp)
1445 if (exp->exp_connection != NULL)
1446 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1450 EXPORT_SYMBOL(obd_export_nid2str);
1452 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1454 struct cfs_hash *nid_hash;
1455 struct obd_export *doomed_exp = NULL;
1456 int exports_evicted = 0;
1458 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1460 spin_lock(&obd->obd_dev_lock);
1461 /* umount has run already, so evict thread should leave
1462 * its task to umount thread now */
1463 if (obd->obd_stopping) {
1464 spin_unlock(&obd->obd_dev_lock);
1465 return exports_evicted;
1467 nid_hash = obd->obd_nid_hash;
1468 cfs_hash_getref(nid_hash);
1469 spin_unlock(&obd->obd_dev_lock);
1472 doomed_exp = cfs_hash_lookup(nid_hash, &nid_key);
1473 if (doomed_exp == NULL)
1476 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1477 "nid %s found, wanted nid %s, requested nid %s\n",
1478 obd_export_nid2str(doomed_exp),
1479 libcfs_nid2str(nid_key), nid);
1480 LASSERTF(doomed_exp != obd->obd_self_export,
1481 "self-export is hashed by NID?\n");
1483 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative "
1484 "request\n", obd->obd_name,
1485 obd_uuid2str(&doomed_exp->exp_client_uuid),
1486 obd_export_nid2str(doomed_exp));
1487 class_fail_export(doomed_exp);
1488 class_export_put(doomed_exp);
1491 cfs_hash_putref(nid_hash);
1493 if (!exports_evicted)
1494 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1495 obd->obd_name, nid);
1496 return exports_evicted;
1498 EXPORT_SYMBOL(obd_export_evict_by_nid);
1500 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1502 struct cfs_hash *uuid_hash;
1503 struct obd_export *doomed_exp = NULL;
1504 struct obd_uuid doomed_uuid;
1505 int exports_evicted = 0;
1507 spin_lock(&obd->obd_dev_lock);
1508 if (obd->obd_stopping) {
1509 spin_unlock(&obd->obd_dev_lock);
1510 return exports_evicted;
1512 uuid_hash = obd->obd_uuid_hash;
1513 cfs_hash_getref(uuid_hash);
1514 spin_unlock(&obd->obd_dev_lock);
1516 obd_str2uuid(&doomed_uuid, uuid);
1517 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1518 CERROR("%s: can't evict myself\n", obd->obd_name);
1519 cfs_hash_putref(uuid_hash);
1520 return exports_evicted;
1523 doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid);
1525 if (doomed_exp == NULL) {
1526 CERROR("%s: can't disconnect %s: no exports found\n",
1527 obd->obd_name, uuid);
1529 CWARN("%s: evicting %s at adminstrative request\n",
1530 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1531 class_fail_export(doomed_exp);
1532 class_export_put(doomed_exp);
1535 cfs_hash_putref(uuid_hash);
1537 return exports_evicted;
1540 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1541 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1542 EXPORT_SYMBOL(class_export_dump_hook);
1545 static void print_export_data(struct obd_export *exp, const char *status,
1546 int locks, int debug_level)
1548 struct ptlrpc_reply_state *rs;
1549 struct ptlrpc_reply_state *first_reply = NULL;
1552 spin_lock(&exp->exp_lock);
1553 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1559 spin_unlock(&exp->exp_lock);
1561 CDEBUG(debug_level, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: "
1562 "%p %s %llu stale:%d\n",
1563 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1564 obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1565 atomic_read(&exp->exp_rpc_count),
1566 atomic_read(&exp->exp_cb_count),
1567 atomic_read(&exp->exp_locks_count),
1568 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1569 nreplies, first_reply, nreplies > 3 ? "..." : "",
1570 exp->exp_last_committed, !list_empty(&exp->exp_stale_list));
1571 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1572 if (locks && class_export_dump_hook != NULL)
1573 class_export_dump_hook(exp);
1577 void dump_exports(struct obd_device *obd, int locks, int debug_level)
1579 struct obd_export *exp;
1581 spin_lock(&obd->obd_dev_lock);
1582 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1583 print_export_data(exp, "ACTIVE", locks, debug_level);
1584 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1585 print_export_data(exp, "UNLINKED", locks, debug_level);
1586 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1587 print_export_data(exp, "DELAYED", locks, debug_level);
1588 spin_unlock(&obd->obd_dev_lock);
1589 spin_lock(&obd_zombie_impexp_lock);
1590 list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1591 print_export_data(exp, "ZOMBIE", locks, debug_level);
1592 spin_unlock(&obd_zombie_impexp_lock);
1595 void obd_exports_barrier(struct obd_device *obd)
1598 LASSERT(list_empty(&obd->obd_exports));
1599 spin_lock(&obd->obd_dev_lock);
1600 while (!list_empty(&obd->obd_unlinked_exports)) {
1601 spin_unlock(&obd->obd_dev_lock);
1602 set_current_state(TASK_UNINTERRUPTIBLE);
1603 schedule_timeout(cfs_time_seconds(waited));
1604 if (waited > 5 && is_power_of_2(waited)) {
1605 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1606 "more than %d seconds. "
1607 "The obd refcount = %d. Is it stuck?\n",
1608 obd->obd_name, waited,
1609 atomic_read(&obd->obd_refcount));
1610 dump_exports(obd, 1, D_CONSOLE | D_WARNING);
1613 spin_lock(&obd->obd_dev_lock);
1615 spin_unlock(&obd->obd_dev_lock);
1617 EXPORT_SYMBOL(obd_exports_barrier);
1619 /* Total amount of zombies to be destroyed */
1620 static int zombies_count = 0;
1623 * kill zombie imports and exports
1625 void obd_zombie_impexp_cull(void)
1627 struct obd_import *import;
1628 struct obd_export *export;
1632 spin_lock(&obd_zombie_impexp_lock);
1635 if (!list_empty(&obd_zombie_imports)) {
1636 import = list_entry(obd_zombie_imports.next,
1639 list_del_init(&import->imp_zombie_chain);
1643 if (!list_empty(&obd_zombie_exports)) {
1644 export = list_entry(obd_zombie_exports.next,
1647 list_del_init(&export->exp_obd_chain);
1650 spin_unlock(&obd_zombie_impexp_lock);
1652 if (import != NULL) {
1653 class_import_destroy(import);
1654 spin_lock(&obd_zombie_impexp_lock);
1656 spin_unlock(&obd_zombie_impexp_lock);
1659 if (export != NULL) {
1660 class_export_destroy(export);
1661 spin_lock(&obd_zombie_impexp_lock);
1663 spin_unlock(&obd_zombie_impexp_lock);
1667 } while (import != NULL || export != NULL);
1671 static DECLARE_COMPLETION(obd_zombie_start);
1672 static DECLARE_COMPLETION(obd_zombie_stop);
1673 static unsigned long obd_zombie_flags;
1674 static DECLARE_WAIT_QUEUE_HEAD(obd_zombie_waitq);
1675 static pid_t obd_zombie_pid;
1678 OBD_ZOMBIE_STOP = 0x0001,
1682 * check for work for kill zombie import/export thread.
1684 static int obd_zombie_impexp_check(void *arg)
1688 spin_lock(&obd_zombie_impexp_lock);
1689 rc = (zombies_count == 0) &&
1690 !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1691 spin_unlock(&obd_zombie_impexp_lock);
1697 * Add export to the obd_zombe thread and notify it.
1699 static void obd_zombie_export_add(struct obd_export *exp) {
1700 atomic_dec(&obd_stale_export_num);
1701 spin_lock(&exp->exp_obd->obd_dev_lock);
1702 LASSERT(!list_empty(&exp->exp_obd_chain));
1703 list_del_init(&exp->exp_obd_chain);
1704 spin_unlock(&exp->exp_obd->obd_dev_lock);
1705 spin_lock(&obd_zombie_impexp_lock);
1707 list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1708 spin_unlock(&obd_zombie_impexp_lock);
1710 obd_zombie_impexp_notify();
1714 * Add import to the obd_zombe thread and notify it.
1716 static void obd_zombie_import_add(struct obd_import *imp) {
1717 LASSERT(imp->imp_sec == NULL);
1718 spin_lock(&obd_zombie_impexp_lock);
1719 LASSERT(list_empty(&imp->imp_zombie_chain));
1721 list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1722 spin_unlock(&obd_zombie_impexp_lock);
1724 obd_zombie_impexp_notify();
1728 * notify import/export destroy thread about new zombie.
1730 static void obd_zombie_impexp_notify(void)
1733 * Make sure obd_zomebie_impexp_thread get this notification.
1734 * It is possible this signal only get by obd_zombie_barrier, and
1735 * barrier gulps this notification and sleeps away and hangs ensues
1737 wake_up_all(&obd_zombie_waitq);
1741 * check whether obd_zombie is idle
1743 static int obd_zombie_is_idle(void)
1747 LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1748 spin_lock(&obd_zombie_impexp_lock);
1749 rc = (zombies_count == 0);
1750 spin_unlock(&obd_zombie_impexp_lock);
1755 * wait when obd_zombie import/export queues become empty
1757 void obd_zombie_barrier(void)
1759 struct l_wait_info lwi = { 0 };
1761 if (obd_zombie_pid == current_pid())
1762 /* don't wait for myself */
1764 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1766 EXPORT_SYMBOL(obd_zombie_barrier);
1769 struct obd_export *obd_stale_export_get(void)
1771 struct obd_export *exp = NULL;
1774 spin_lock(&obd_stale_export_lock);
1775 if (!list_empty(&obd_stale_exports)) {
1776 exp = list_entry(obd_stale_exports.next,
1777 struct obd_export, exp_stale_list);
1778 list_del_init(&exp->exp_stale_list);
1780 spin_unlock(&obd_stale_export_lock);
1783 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1784 atomic_read(&obd_stale_export_num));
1788 EXPORT_SYMBOL(obd_stale_export_get);
1790 void obd_stale_export_put(struct obd_export *exp)
1794 LASSERT(list_empty(&exp->exp_stale_list));
1795 if (exp->exp_lock_hash &&
1796 atomic_read(&exp->exp_lock_hash->hs_count)) {
1797 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1798 atomic_read(&obd_stale_export_num));
1800 spin_lock_bh(&exp->exp_bl_list_lock);
1801 spin_lock(&obd_stale_export_lock);
1802 /* Add to the tail if there is no blocked locks,
1803 * to the head otherwise. */
1804 if (list_empty(&exp->exp_bl_list))
1805 list_add_tail(&exp->exp_stale_list,
1806 &obd_stale_exports);
1808 list_add(&exp->exp_stale_list,
1809 &obd_stale_exports);
1811 spin_unlock(&obd_stale_export_lock);
1812 spin_unlock_bh(&exp->exp_bl_list_lock);
1814 class_export_put(exp);
1818 EXPORT_SYMBOL(obd_stale_export_put);
1821 * Adjust the position of the export in the stale list,
1822 * i.e. move to the head of the list if is needed.
1824 void obd_stale_export_adjust(struct obd_export *exp)
1826 LASSERT(exp != NULL);
1827 spin_lock_bh(&exp->exp_bl_list_lock);
1828 spin_lock(&obd_stale_export_lock);
1830 if (!list_empty(&exp->exp_stale_list) &&
1831 !list_empty(&exp->exp_bl_list))
1832 list_move(&exp->exp_stale_list, &obd_stale_exports);
1834 spin_unlock(&obd_stale_export_lock);
1835 spin_unlock_bh(&exp->exp_bl_list_lock);
1837 EXPORT_SYMBOL(obd_stale_export_adjust);
1840 * destroy zombie export/import thread.
1842 static int obd_zombie_impexp_thread(void *unused)
1844 unshare_fs_struct();
1845 complete(&obd_zombie_start);
1847 obd_zombie_pid = current_pid();
1849 while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1850 struct l_wait_info lwi = { 0 };
1852 l_wait_event(obd_zombie_waitq,
1853 !obd_zombie_impexp_check(NULL), &lwi);
1854 obd_zombie_impexp_cull();
1857 * Notify obd_zombie_barrier callers that queues
1860 wake_up(&obd_zombie_waitq);
1863 complete(&obd_zombie_stop);
1870 * start destroy zombie import/export thread
1872 int obd_zombie_impexp_init(void)
1874 struct task_struct *task;
1876 task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
1878 RETURN(PTR_ERR(task));
1880 wait_for_completion(&obd_zombie_start);
1884 * stop destroy zombie import/export thread
1886 void obd_zombie_impexp_stop(void)
1888 set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1889 obd_zombie_impexp_notify();
1890 wait_for_completion(&obd_zombie_stop);
1891 LASSERT(list_empty(&obd_stale_exports));
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 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)
2153 unsigned long mod_tot = 0, mod_cum;
2154 struct timespec64 now;
2157 ktime_get_real_ts64(&now);
2159 spin_lock(&cli->cl_mod_rpcs_lock);
2161 seq_printf(seq, "snapshot_time: %llu.%9lu (secs.nsecs)\n",
2162 (s64)now.tv_sec, now.tv_nsec);
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);