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, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/obdclass/genops.c
33 * These are the only exported functions, they provide some generic
34 * infrastructure for managing object devices
37 #define DEBUG_SUBSYSTEM S_CLASS
39 #include <linux/pid_namespace.h>
40 #include <linux/workqueue.h>
41 #include <lustre_compat.h>
42 #include <obd_class.h>
43 #include <lustre_log.h>
44 #include <lprocfs_status.h>
45 #include <lustre_disk.h>
46 #include <lustre_kernelcomm.h>
48 DEFINE_RWLOCK(obd_dev_lock);
49 static struct obd_device *obd_devs[MAX_OBD_DEVICES];
51 static struct kmem_cache *obd_device_cachep;
52 static struct kobj_type class_ktype;
53 static struct workqueue_struct *zombie_wq;
55 static void obd_zombie_export_add(struct obd_export *exp);
56 static void obd_zombie_import_add(struct obd_import *imp);
57 static void print_export_data(struct obd_export *exp,
58 const char *status, int locks, int debug_level);
60 static LIST_HEAD(obd_stale_exports);
61 static DEFINE_SPINLOCK(obd_stale_export_lock);
62 static atomic_t obd_stale_export_num = ATOMIC_INIT(0);
65 * support functions: we could use inter-module communication, but this
66 * is more portable to other OS's
68 static struct obd_device *obd_device_alloc(void)
70 struct obd_device *obd;
72 OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, GFP_NOFS);
74 obd->obd_magic = OBD_DEVICE_MAGIC;
79 static void obd_device_free(struct obd_device *obd)
82 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
83 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
84 if (obd->obd_namespace != NULL) {
85 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
86 obd, obd->obd_namespace, obd->obd_force);
89 lu_ref_fini(&obd->obd_reference);
90 OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
93 struct obd_type *class_search_type(const char *name)
95 struct kobject *kobj = kset_find_obj(lustre_kset, name);
97 if (kobj && kobj->ktype == &class_ktype)
98 return container_of(kobj, struct obd_type, typ_kobj);
103 EXPORT_SYMBOL(class_search_type);
105 struct obd_type *class_get_type(const char *name)
107 struct obd_type *type;
109 type = class_search_type(name);
110 #ifdef HAVE_MODULE_LOADING_SUPPORT
112 const char *modname = name;
114 #ifdef HAVE_SERVER_SUPPORT
115 if (strcmp(modname, "obdfilter") == 0)
118 if (strcmp(modname, LUSTRE_LWP_NAME) == 0)
119 modname = LUSTRE_OSP_NAME;
121 if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME)))
122 modname = LUSTRE_MDT_NAME;
123 #endif /* HAVE_SERVER_SUPPORT */
125 if (!request_module("%s", modname)) {
126 CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
127 type = class_search_type(name);
129 LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
135 if (try_module_get(type->typ_dt_ops->o_owner)) {
136 atomic_inc(&type->typ_refcnt);
137 /* class_search_type() returned a counted reference,
138 * but we don't need that count any more as
139 * we have one through typ_refcnt.
141 kobject_put(&type->typ_kobj);
143 kobject_put(&type->typ_kobj);
149 EXPORT_SYMBOL(class_get_type);
151 void class_put_type(struct obd_type *type)
154 module_put(type->typ_dt_ops->o_owner);
155 atomic_dec(&type->typ_refcnt);
157 EXPORT_SYMBOL(class_put_type);
159 static void class_sysfs_release(struct kobject *kobj)
161 struct obd_type *type = container_of(kobj, struct obd_type, typ_kobj);
163 debugfs_remove_recursive(type->typ_debugfs_entry);
164 type->typ_debugfs_entry = NULL;
167 lu_device_type_fini(type->typ_lu);
169 #ifdef CONFIG_PROC_FS
170 if (type->typ_name && type->typ_procroot)
171 remove_proc_subtree(type->typ_name, proc_lustre_root);
173 OBD_FREE(type, sizeof(*type));
176 static struct kobj_type class_ktype = {
177 .sysfs_ops = &lustre_sysfs_ops,
178 .release = class_sysfs_release,
181 #ifdef HAVE_SERVER_SUPPORT
182 struct obd_type *class_add_symlinks(const char *name, bool enable_proc)
184 struct dentry *symlink;
185 struct obd_type *type;
188 type = class_search_type(name);
190 kobject_put(&type->typ_kobj);
191 return ERR_PTR(-EEXIST);
194 OBD_ALLOC(type, sizeof(*type));
196 return ERR_PTR(-ENOMEM);
198 type->typ_kobj.kset = lustre_kset;
199 rc = kobject_init_and_add(&type->typ_kobj, &class_ktype,
200 &lustre_kset->kobj, "%s", name);
204 symlink = debugfs_create_dir(name, debugfs_lustre_root);
205 type->typ_debugfs_entry = symlink;
206 type->typ_sym_filter = true;
209 type->typ_procroot = lprocfs_register(name, proc_lustre_root,
211 if (IS_ERR(type->typ_procroot)) {
212 CERROR("%s: can't create compat proc entry: %d\n",
213 name, (int)PTR_ERR(type->typ_procroot));
214 type->typ_procroot = NULL;
220 EXPORT_SYMBOL(class_add_symlinks);
221 #endif /* HAVE_SERVER_SUPPORT */
223 #define CLASS_MAX_NAME 1024
225 int class_register_type(const struct obd_ops *dt_ops,
226 const struct md_ops *md_ops,
228 const char *name, struct lu_device_type *ldt)
230 struct obd_type *type;
235 LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
237 type = class_search_type(name);
239 #ifdef HAVE_SERVER_SUPPORT
240 if (type->typ_sym_filter)
242 #endif /* HAVE_SERVER_SUPPORT */
243 kobject_put(&type->typ_kobj);
244 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
248 OBD_ALLOC(type, sizeof(*type));
252 type->typ_lu = ldt ? OBD_LU_TYPE_SETUP : NULL;
253 type->typ_kobj.kset = lustre_kset;
254 kobject_init(&type->typ_kobj, &class_ktype);
255 #ifdef HAVE_SERVER_SUPPORT
257 #endif /* HAVE_SERVER_SUPPORT */
259 type->typ_dt_ops = dt_ops;
260 type->typ_md_ops = md_ops;
262 #ifdef HAVE_SERVER_SUPPORT
263 if (type->typ_sym_filter) {
264 type->typ_sym_filter = false;
265 kobject_put(&type->typ_kobj);
269 #ifdef CONFIG_PROC_FS
270 if (enable_proc && !type->typ_procroot) {
271 type->typ_procroot = lprocfs_register(name,
274 if (IS_ERR(type->typ_procroot)) {
275 rc = PTR_ERR(type->typ_procroot);
276 type->typ_procroot = NULL;
281 type->typ_debugfs_entry = debugfs_create_dir(name, debugfs_lustre_root);
283 rc = kobject_add(&type->typ_kobj, &lustre_kset->kobj, "%s", name);
286 #ifdef HAVE_SERVER_SUPPORT
290 rc = lu_device_type_init(ldt);
291 smp_store_release(&type->typ_lu, rc ? NULL : ldt);
292 wake_up_var(&type->typ_lu);
300 kobject_put(&type->typ_kobj);
304 EXPORT_SYMBOL(class_register_type);
306 int class_unregister_type(const char *name)
308 struct obd_type *type = class_search_type(name);
313 CERROR("unknown obd type\n");
317 if (atomic_read(&type->typ_refcnt)) {
318 CERROR("type %s has refcount (%d)\n", name,
319 atomic_read(&type->typ_refcnt));
320 /* This is a bad situation, let's make the best of it */
321 /* Remove ops, but leave the name for debugging */
322 type->typ_dt_ops = NULL;
323 type->typ_md_ops = NULL;
324 GOTO(out_put, rc = -EBUSY);
327 /* Put the final ref */
328 kobject_put(&type->typ_kobj);
330 /* Put the ref returned by class_search_type() */
331 kobject_put(&type->typ_kobj);
334 } /* class_unregister_type */
335 EXPORT_SYMBOL(class_unregister_type);
338 * Create a new obd device.
340 * Allocate the new obd_device and initialize it.
342 * \param[in] type_name obd device type string.
343 * \param[in] name obd device name.
344 * \param[in] uuid obd device UUID
346 * \retval newdev pointer to created obd_device
347 * \retval ERR_PTR(errno) on error
349 struct obd_device *class_newdev(const char *type_name, const char *name,
352 struct obd_device *newdev;
353 struct obd_type *type = NULL;
356 if (strlen(name) >= MAX_OBD_NAME) {
357 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
358 RETURN(ERR_PTR(-EINVAL));
361 type = class_get_type(type_name);
363 CERROR("OBD: unknown type: %s\n", type_name);
364 RETURN(ERR_PTR(-ENODEV));
367 newdev = obd_device_alloc();
368 if (newdev == NULL) {
369 class_put_type(type);
370 RETURN(ERR_PTR(-ENOMEM));
372 LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
373 strncpy(newdev->obd_name, name, sizeof(newdev->obd_name) - 1);
374 newdev->obd_type = type;
375 newdev->obd_minor = -1;
377 rwlock_init(&newdev->obd_pool_lock);
378 newdev->obd_pool_limit = 0;
379 newdev->obd_pool_slv = 0;
381 INIT_LIST_HEAD(&newdev->obd_exports);
382 newdev->obd_num_exports = 0;
383 newdev->obd_grant_check_threshold = 100;
384 INIT_LIST_HEAD(&newdev->obd_unlinked_exports);
385 INIT_LIST_HEAD(&newdev->obd_delayed_exports);
386 INIT_LIST_HEAD(&newdev->obd_exports_timed);
387 INIT_LIST_HEAD(&newdev->obd_nid_stats);
388 spin_lock_init(&newdev->obd_nid_lock);
389 spin_lock_init(&newdev->obd_dev_lock);
390 mutex_init(&newdev->obd_dev_mutex);
391 spin_lock_init(&newdev->obd_osfs_lock);
392 /* newdev->obd_osfs_age must be set to a value in the distant
393 * past to guarantee a fresh statfs is fetched on mount. */
394 newdev->obd_osfs_age = ktime_get_seconds() - 1000;
396 /* XXX belongs in setup not attach */
397 init_rwsem(&newdev->obd_observer_link_sem);
399 spin_lock_init(&newdev->obd_recovery_task_lock);
400 init_waitqueue_head(&newdev->obd_next_transno_waitq);
401 init_waitqueue_head(&newdev->obd_evict_inprogress_waitq);
402 INIT_LIST_HEAD(&newdev->obd_req_replay_queue);
403 INIT_LIST_HEAD(&newdev->obd_lock_replay_queue);
404 INIT_LIST_HEAD(&newdev->obd_final_req_queue);
405 INIT_LIST_HEAD(&newdev->obd_evict_list);
406 INIT_LIST_HEAD(&newdev->obd_lwp_list);
408 llog_group_init(&newdev->obd_olg);
409 /* Detach drops this */
410 atomic_set(&newdev->obd_refcount, 1);
411 lu_ref_init(&newdev->obd_reference);
412 lu_ref_add(&newdev->obd_reference, "newdev", newdev);
414 newdev->obd_conn_inprogress = 0;
416 strncpy(newdev->obd_uuid.uuid, uuid, UUID_MAX);
418 CDEBUG(D_IOCTL, "Allocate new device %s (%p)\n",
419 newdev->obd_name, newdev);
427 * \param[in] obd obd_device to be freed
431 void class_free_dev(struct obd_device *obd)
433 struct obd_type *obd_type = obd->obd_type;
435 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x "
436 "!= %08x\n", obd, obd->obd_magic, OBD_DEVICE_MAGIC);
437 LASSERTF(obd->obd_minor == -1 || obd_devs[obd->obd_minor] == obd,
438 "obd %p != obd_devs[%d] %p\n",
439 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
440 LASSERTF(atomic_read(&obd->obd_refcount) == 0,
441 "obd_refcount should be 0, not %d\n",
442 atomic_read(&obd->obd_refcount));
443 LASSERT(obd_type != NULL);
445 CDEBUG(D_INFO, "Release obd device %s obd_type name = %s\n",
446 obd->obd_name, obd->obd_type->typ_name);
448 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
449 obd->obd_name, obd->obd_uuid.uuid);
450 if (obd->obd_stopping) {
453 /* If we're not stopping, we were never set up */
454 err = obd_cleanup(obd);
456 CERROR("Cleanup %s returned %d\n",
460 obd_device_free(obd);
462 class_put_type(obd_type);
466 * Unregister obd device.
468 * Free slot in obd_dev[] used by \a obd.
470 * \param[in] new_obd obd_device to be unregistered
474 void class_unregister_device(struct obd_device *obd)
476 write_lock(&obd_dev_lock);
477 if (obd->obd_minor >= 0) {
478 LASSERT(obd_devs[obd->obd_minor] == obd);
479 obd_devs[obd->obd_minor] = NULL;
482 write_unlock(&obd_dev_lock);
486 * Register obd device.
488 * Find free slot in obd_devs[], fills it with \a new_obd.
490 * \param[in] new_obd obd_device to be registered
493 * \retval -EEXIST device with this name is registered
494 * \retval -EOVERFLOW obd_devs[] is full
496 int class_register_device(struct obd_device *new_obd)
500 int new_obd_minor = 0;
501 bool minor_assign = false;
502 bool retried = false;
505 write_lock(&obd_dev_lock);
506 for (i = 0; i < class_devno_max(); i++) {
507 struct obd_device *obd = class_num2obd(i);
510 (strcmp(new_obd->obd_name, obd->obd_name) == 0)) {
513 write_unlock(&obd_dev_lock);
515 /* the obd_device could be waited to be
516 * destroyed by the "obd_zombie_impexp_thread".
518 obd_zombie_barrier();
523 CERROR("%s: already exists, won't add\n",
525 /* in case we found a free slot before duplicate */
526 minor_assign = false;
530 if (!minor_assign && obd == NULL) {
537 new_obd->obd_minor = new_obd_minor;
538 LASSERTF(obd_devs[new_obd_minor] == NULL, "obd_devs[%d] "
539 "%p\n", new_obd_minor, obd_devs[new_obd_minor]);
540 obd_devs[new_obd_minor] = new_obd;
544 CERROR("%s: all %u/%u devices used, increase "
545 "MAX_OBD_DEVICES: rc = %d\n", new_obd->obd_name,
546 i, class_devno_max(), ret);
549 write_unlock(&obd_dev_lock);
554 static int class_name2dev_nolock(const char *name)
561 for (i = 0; i < class_devno_max(); i++) {
562 struct obd_device *obd = class_num2obd(i);
564 if (obd && strcmp(name, obd->obd_name) == 0) {
565 /* Make sure we finished attaching before we give
566 out any references */
567 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
568 if (obd->obd_attached) {
578 int class_name2dev(const char *name)
585 read_lock(&obd_dev_lock);
586 i = class_name2dev_nolock(name);
587 read_unlock(&obd_dev_lock);
591 EXPORT_SYMBOL(class_name2dev);
593 struct obd_device *class_name2obd(const char *name)
595 int dev = class_name2dev(name);
597 if (dev < 0 || dev > class_devno_max())
599 return class_num2obd(dev);
601 EXPORT_SYMBOL(class_name2obd);
603 int class_uuid2dev_nolock(struct obd_uuid *uuid)
607 for (i = 0; i < class_devno_max(); i++) {
608 struct obd_device *obd = class_num2obd(i);
610 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
611 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
619 int class_uuid2dev(struct obd_uuid *uuid)
623 read_lock(&obd_dev_lock);
624 i = class_uuid2dev_nolock(uuid);
625 read_unlock(&obd_dev_lock);
629 EXPORT_SYMBOL(class_uuid2dev);
631 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
633 int dev = class_uuid2dev(uuid);
636 return class_num2obd(dev);
638 EXPORT_SYMBOL(class_uuid2obd);
641 * Get obd device from ::obd_devs[]
643 * \param num [in] array index
645 * \retval NULL if ::obd_devs[\a num] does not contains an obd device
646 * otherwise return the obd device there.
648 struct obd_device *class_num2obd(int num)
650 struct obd_device *obd = NULL;
652 if (num < class_devno_max()) {
657 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
658 "%p obd_magic %08x != %08x\n",
659 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
660 LASSERTF(obd->obd_minor == num,
661 "%p obd_minor %0d != %0d\n",
662 obd, obd->obd_minor, num);
667 EXPORT_SYMBOL(class_num2obd);
670 * Find obd in obd_dev[] by name or uuid.
672 * Increment obd's refcount if found.
674 * \param[in] str obd name or uuid
676 * \retval NULL if not found
677 * \retval target pointer to found obd_device
679 struct obd_device *class_dev_by_str(const char *str)
681 struct obd_device *target = NULL;
682 struct obd_uuid tgtuuid;
685 obd_str2uuid(&tgtuuid, str);
687 read_lock(&obd_dev_lock);
688 rc = class_uuid2dev_nolock(&tgtuuid);
690 rc = class_name2dev_nolock(str);
693 target = class_num2obd(rc);
696 class_incref(target, "find", current);
697 read_unlock(&obd_dev_lock);
701 EXPORT_SYMBOL(class_dev_by_str);
704 * Get obd devices count. Device in any
706 * \retval obd device count
708 int get_devices_count(void)
710 int index, max_index = class_devno_max(), dev_count = 0;
712 read_lock(&obd_dev_lock);
713 for (index = 0; index <= max_index; index++) {
714 struct obd_device *obd = class_num2obd(index);
718 read_unlock(&obd_dev_lock);
722 EXPORT_SYMBOL(get_devices_count);
724 void class_obd_list(void)
729 read_lock(&obd_dev_lock);
730 for (i = 0; i < class_devno_max(); i++) {
731 struct obd_device *obd = class_num2obd(i);
735 if (obd->obd_stopping)
737 else if (obd->obd_set_up)
739 else if (obd->obd_attached)
743 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
744 i, status, obd->obd_type->typ_name,
745 obd->obd_name, obd->obd_uuid.uuid,
746 atomic_read(&obd->obd_refcount));
748 read_unlock(&obd_dev_lock);
751 /* Search for a client OBD connected to tgt_uuid. If grp_uuid is
752 * specified, then only the client with that uuid is returned,
753 * otherwise any client connected to the tgt is returned.
755 struct obd_device *class_find_client_obd(struct obd_uuid *tgt_uuid,
756 const char *type_name,
757 struct obd_uuid *grp_uuid)
761 read_lock(&obd_dev_lock);
762 for (i = 0; i < class_devno_max(); i++) {
763 struct obd_device *obd = class_num2obd(i);
767 if ((strncmp(obd->obd_type->typ_name, type_name,
768 strlen(type_name)) == 0)) {
769 if (obd_uuid_equals(tgt_uuid,
770 &obd->u.cli.cl_target_uuid) &&
771 ((grp_uuid)? obd_uuid_equals(grp_uuid,
772 &obd->obd_uuid) : 1)) {
773 read_unlock(&obd_dev_lock);
778 read_unlock(&obd_dev_lock);
782 EXPORT_SYMBOL(class_find_client_obd);
784 /* Iterate the obd_device list looking devices have grp_uuid. Start
785 * searching at *next, and if a device is found, the next index to look
786 * at is saved in *next. If next is NULL, then the first matching device
787 * will always be returned.
789 struct obd_device *class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
795 else if (*next >= 0 && *next < class_devno_max())
800 read_lock(&obd_dev_lock);
801 for (; i < class_devno_max(); i++) {
802 struct obd_device *obd = class_num2obd(i);
806 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
809 read_unlock(&obd_dev_lock);
813 read_unlock(&obd_dev_lock);
817 EXPORT_SYMBOL(class_devices_in_group);
820 * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
821 * adjust sptlrpc settings accordingly.
823 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
825 struct obd_device *obd;
829 LASSERT(namelen > 0);
831 read_lock(&obd_dev_lock);
832 for (i = 0; i < class_devno_max(); i++) {
833 obd = class_num2obd(i);
835 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
838 /* only notify mdc, osc, osp, lwp, mdt, ost
839 * because only these have a -sptlrpc llog */
840 type = obd->obd_type->typ_name;
841 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
842 strcmp(type, LUSTRE_OSC_NAME) != 0 &&
843 strcmp(type, LUSTRE_OSP_NAME) != 0 &&
844 strcmp(type, LUSTRE_LWP_NAME) != 0 &&
845 strcmp(type, LUSTRE_MDT_NAME) != 0 &&
846 strcmp(type, LUSTRE_OST_NAME) != 0)
849 if (strncmp(obd->obd_name, fsname, namelen))
852 class_incref(obd, __FUNCTION__, obd);
853 read_unlock(&obd_dev_lock);
854 rc2 = obd_set_info_async(NULL, obd->obd_self_export,
855 sizeof(KEY_SPTLRPC_CONF),
856 KEY_SPTLRPC_CONF, 0, NULL, NULL);
858 class_decref(obd, __FUNCTION__, obd);
859 read_lock(&obd_dev_lock);
861 read_unlock(&obd_dev_lock);
864 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
866 void obd_cleanup_caches(void)
869 if (obd_device_cachep) {
870 kmem_cache_destroy(obd_device_cachep);
871 obd_device_cachep = NULL;
877 int obd_init_caches(void)
882 LASSERT(obd_device_cachep == NULL);
883 obd_device_cachep = kmem_cache_create_usercopy("ll_obd_dev_cache",
884 sizeof(struct obd_device),
885 0, 0, 0, sizeof(struct obd_device), NULL);
886 if (!obd_device_cachep)
887 GOTO(out, rc = -ENOMEM);
891 obd_cleanup_caches();
895 static const char export_handle_owner[] = "export";
897 /* map connection to client */
898 struct obd_export *class_conn2export(struct lustre_handle *conn)
900 struct obd_export *export;
904 CDEBUG(D_CACHE, "looking for null handle\n");
908 if (conn->cookie == -1) { /* this means assign a new connection */
909 CDEBUG(D_CACHE, "want a new connection\n");
913 CDEBUG(D_INFO, "looking for export cookie %#llx\n", conn->cookie);
914 export = class_handle2object(conn->cookie, export_handle_owner);
917 EXPORT_SYMBOL(class_conn2export);
919 struct obd_device *class_exp2obd(struct obd_export *exp)
925 EXPORT_SYMBOL(class_exp2obd);
927 struct obd_import *class_exp2cliimp(struct obd_export *exp)
929 struct obd_device *obd = exp->exp_obd;
932 return obd->u.cli.cl_import;
934 EXPORT_SYMBOL(class_exp2cliimp);
936 /* Export management functions */
937 static void class_export_destroy(struct obd_export *exp)
939 struct obd_device *obd = exp->exp_obd;
942 LASSERT(refcount_read(&exp->exp_handle.h_ref) == 0);
943 LASSERT(obd != NULL);
945 CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
946 exp->exp_client_uuid.uuid, obd->obd_name);
948 /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
949 ptlrpc_connection_put(exp->exp_connection);
951 LASSERT(list_empty(&exp->exp_outstanding_replies));
952 LASSERT(list_empty(&exp->exp_uncommitted_replies));
953 LASSERT(list_empty(&exp->exp_req_replay_queue));
954 LASSERT(list_empty(&exp->exp_hp_rpcs));
955 obd_destroy_export(exp);
956 /* self export doesn't hold a reference to an obd, although it
957 * exists until freeing of the obd */
958 if (exp != obd->obd_self_export)
959 class_decref(obd, "export", exp);
961 OBD_FREE_PRE(exp, sizeof(*exp), "kfree_rcu");
962 kfree_rcu(exp, exp_handle.h_rcu);
966 struct obd_export *class_export_get(struct obd_export *exp)
968 refcount_inc(&exp->exp_handle.h_ref);
969 CDEBUG(D_INFO, "GET export %p refcount=%d\n", exp,
970 refcount_read(&exp->exp_handle.h_ref));
973 EXPORT_SYMBOL(class_export_get);
975 void class_export_put(struct obd_export *exp)
977 LASSERT(exp != NULL);
978 LASSERT(refcount_read(&exp->exp_handle.h_ref) > 0);
979 LASSERT(refcount_read(&exp->exp_handle.h_ref) < LI_POISON);
980 CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
981 refcount_read(&exp->exp_handle.h_ref) - 1);
983 if (refcount_dec_and_test(&exp->exp_handle.h_ref)) {
984 struct obd_device *obd = exp->exp_obd;
986 CDEBUG(D_IOCTL, "final put %p/%s\n",
987 exp, exp->exp_client_uuid.uuid);
989 /* release nid stat refererence */
990 lprocfs_exp_cleanup(exp);
992 if (exp == obd->obd_self_export) {
993 /* self export should be destroyed without
994 * zombie thread as it doesn't hold a
995 * reference to obd and doesn't hold any
997 class_export_destroy(exp);
998 /* self export is destroyed, no class
999 * references exist and it is safe to free
1001 class_free_dev(obd);
1003 LASSERT(!list_empty(&exp->exp_obd_chain));
1004 obd_zombie_export_add(exp);
1009 EXPORT_SYMBOL(class_export_put);
1011 static void obd_zombie_exp_cull(struct work_struct *ws)
1013 struct obd_export *export;
1015 export = container_of(ws, struct obd_export, exp_zombie_work);
1016 class_export_destroy(export);
1019 /* Creates a new export, adds it to the hash table, and returns a
1020 * pointer to it. The refcount is 2: one for the hash reference, and
1021 * one for the pointer returned by this function. */
1022 struct obd_export *__class_new_export(struct obd_device *obd,
1023 struct obd_uuid *cluuid, bool is_self)
1025 struct obd_export *export;
1029 OBD_ALLOC_PTR(export);
1031 return ERR_PTR(-ENOMEM);
1033 export->exp_conn_cnt = 0;
1034 export->exp_lock_hash = NULL;
1035 export->exp_flock_hash = NULL;
1036 /* 2 = class_handle_hash + last */
1037 refcount_set(&export->exp_handle.h_ref, 2);
1038 atomic_set(&export->exp_rpc_count, 0);
1039 atomic_set(&export->exp_cb_count, 0);
1040 atomic_set(&export->exp_locks_count, 0);
1041 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1042 INIT_LIST_HEAD(&export->exp_locks_list);
1043 spin_lock_init(&export->exp_locks_list_guard);
1045 atomic_set(&export->exp_replay_count, 0);
1046 export->exp_obd = obd;
1047 INIT_LIST_HEAD(&export->exp_outstanding_replies);
1048 spin_lock_init(&export->exp_uncommitted_replies_lock);
1049 INIT_LIST_HEAD(&export->exp_uncommitted_replies);
1050 INIT_LIST_HEAD(&export->exp_req_replay_queue);
1051 INIT_HLIST_NODE(&export->exp_handle.h_link);
1052 INIT_LIST_HEAD(&export->exp_hp_rpcs);
1053 INIT_LIST_HEAD(&export->exp_reg_rpcs);
1054 class_handle_hash(&export->exp_handle, export_handle_owner);
1055 export->exp_last_request_time = ktime_get_real_seconds();
1056 spin_lock_init(&export->exp_lock);
1057 spin_lock_init(&export->exp_rpc_lock);
1058 INIT_HLIST_NODE(&export->exp_gen_hash);
1059 spin_lock_init(&export->exp_bl_list_lock);
1060 INIT_LIST_HEAD(&export->exp_bl_list);
1061 INIT_LIST_HEAD(&export->exp_stale_list);
1062 INIT_WORK(&export->exp_zombie_work, obd_zombie_exp_cull);
1064 export->exp_sp_peer = LUSTRE_SP_ANY;
1065 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
1066 export->exp_client_uuid = *cluuid;
1067 obd_init_export(export);
1069 at_init(&export->exp_bl_lock_at, obd_timeout, 0);
1071 spin_lock(&obd->obd_dev_lock);
1072 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
1073 /* shouldn't happen, but might race */
1074 if (obd->obd_stopping)
1075 GOTO(exit_unlock, rc = -ENODEV);
1077 rc = obd_uuid_add(obd, export);
1079 LCONSOLE_WARN("%s: denying duplicate export for %s: rc = %d\n",
1080 obd->obd_name, cluuid->uuid, rc);
1081 GOTO(exit_unlock, rc = -EALREADY);
1086 class_incref(obd, "export", export);
1087 list_add_tail(&export->exp_obd_chain_timed,
1088 &obd->obd_exports_timed);
1089 list_add(&export->exp_obd_chain, &obd->obd_exports);
1090 obd->obd_num_exports++;
1092 INIT_LIST_HEAD(&export->exp_obd_chain_timed);
1093 INIT_LIST_HEAD(&export->exp_obd_chain);
1095 spin_unlock(&obd->obd_dev_lock);
1099 spin_unlock(&obd->obd_dev_lock);
1100 class_handle_unhash(&export->exp_handle);
1101 obd_destroy_export(export);
1102 OBD_FREE_PTR(export);
1106 struct obd_export *class_new_export(struct obd_device *obd,
1107 struct obd_uuid *uuid)
1109 return __class_new_export(obd, uuid, false);
1111 EXPORT_SYMBOL(class_new_export);
1113 struct obd_export *class_new_export_self(struct obd_device *obd,
1114 struct obd_uuid *uuid)
1116 return __class_new_export(obd, uuid, true);
1119 void class_unlink_export(struct obd_export *exp)
1121 class_handle_unhash(&exp->exp_handle);
1123 if (exp->exp_obd->obd_self_export == exp) {
1124 class_export_put(exp);
1128 spin_lock(&exp->exp_obd->obd_dev_lock);
1129 /* delete an uuid-export hashitem from hashtables */
1130 if (exp != exp->exp_obd->obd_self_export)
1131 obd_uuid_del(exp->exp_obd, exp);
1133 #ifdef HAVE_SERVER_SUPPORT
1134 if (!hlist_unhashed(&exp->exp_gen_hash)) {
1135 struct tg_export_data *ted = &exp->exp_target_data;
1136 struct cfs_hash *hash;
1138 /* Because obd_gen_hash will not be released until
1139 * class_cleanup(), so hash should never be NULL here */
1140 hash = cfs_hash_getref(exp->exp_obd->obd_gen_hash);
1141 LASSERT(hash != NULL);
1142 cfs_hash_del(hash, &ted->ted_lcd->lcd_generation,
1143 &exp->exp_gen_hash);
1144 cfs_hash_putref(hash);
1146 #endif /* HAVE_SERVER_SUPPORT */
1148 list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
1149 list_del_init(&exp->exp_obd_chain_timed);
1150 exp->exp_obd->obd_num_exports--;
1151 spin_unlock(&exp->exp_obd->obd_dev_lock);
1152 atomic_inc(&obd_stale_export_num);
1154 /* A reference is kept by obd_stale_exports list */
1155 obd_stale_export_put(exp);
1157 EXPORT_SYMBOL(class_unlink_export);
1159 /* Import management functions */
1160 static void obd_zombie_import_free(struct obd_import *imp)
1162 struct obd_import_conn *imp_conn;
1165 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
1166 imp->imp_obd->obd_name);
1168 LASSERT(refcount_read(&imp->imp_refcount) == 0);
1170 ptlrpc_connection_put(imp->imp_connection);
1172 while ((imp_conn = list_first_entry_or_null(&imp->imp_conn_list,
1173 struct obd_import_conn,
1174 oic_item)) != NULL) {
1175 list_del_init(&imp_conn->oic_item);
1176 ptlrpc_connection_put(imp_conn->oic_conn);
1177 OBD_FREE(imp_conn, sizeof(*imp_conn));
1180 LASSERT(imp->imp_sec == NULL);
1181 LASSERTF(atomic_read(&imp->imp_reqs) == 0, "%s: imp_reqs = %d\n",
1182 imp->imp_obd->obd_name, atomic_read(&imp->imp_reqs));
1183 class_decref(imp->imp_obd, "import", imp);
1188 struct obd_import *class_import_get(struct obd_import *import)
1190 refcount_inc(&import->imp_refcount);
1191 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
1192 refcount_read(&import->imp_refcount),
1193 import->imp_obd->obd_name);
1196 EXPORT_SYMBOL(class_import_get);
1198 void class_import_put(struct obd_import *imp)
1202 LASSERT(refcount_read(&imp->imp_refcount) > 0);
1204 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
1205 refcount_read(&imp->imp_refcount) - 1,
1206 imp->imp_obd->obd_name);
1208 if (refcount_dec_and_test(&imp->imp_refcount)) {
1209 CDEBUG(D_INFO, "final put import %p\n", imp);
1210 obd_zombie_import_add(imp);
1215 EXPORT_SYMBOL(class_import_put);
1217 static void init_imp_at(struct imp_at *at) {
1219 at_init(&at->iat_net_latency, 0, 0);
1220 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1221 /* max service estimates are tracked on the server side, so
1222 don't use the AT history here, just use the last reported
1223 val. (But keep hist for proc histogram, worst_ever) */
1224 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
1229 static void obd_zombie_imp_cull(struct work_struct *ws)
1231 struct obd_import *import;
1233 import = container_of(ws, struct obd_import, imp_zombie_work);
1234 obd_zombie_import_free(import);
1237 struct obd_import *class_new_import(struct obd_device *obd)
1239 struct obd_import *imp;
1240 struct pid_namespace *curr_pid_ns = ll_task_pid_ns(current);
1242 OBD_ALLOC(imp, sizeof(*imp));
1246 INIT_LIST_HEAD(&imp->imp_pinger_chain);
1247 INIT_LIST_HEAD(&imp->imp_replay_list);
1248 INIT_LIST_HEAD(&imp->imp_sending_list);
1249 INIT_LIST_HEAD(&imp->imp_delayed_list);
1250 INIT_LIST_HEAD(&imp->imp_committed_list);
1251 INIT_LIST_HEAD(&imp->imp_unreplied_list);
1252 imp->imp_known_replied_xid = 0;
1253 imp->imp_replay_cursor = &imp->imp_committed_list;
1254 spin_lock_init(&imp->imp_lock);
1255 imp->imp_last_success_conn = 0;
1256 imp->imp_state = LUSTRE_IMP_NEW;
1257 imp->imp_obd = class_incref(obd, "import", imp);
1258 rwlock_init(&imp->imp_sec_lock);
1259 init_waitqueue_head(&imp->imp_recovery_waitq);
1260 INIT_WORK(&imp->imp_zombie_work, obd_zombie_imp_cull);
1262 if (curr_pid_ns && curr_pid_ns->child_reaper)
1263 imp->imp_sec_refpid = curr_pid_ns->child_reaper->pid;
1265 imp->imp_sec_refpid = 1;
1267 refcount_set(&imp->imp_refcount, 2);
1268 atomic_set(&imp->imp_unregistering, 0);
1269 atomic_set(&imp->imp_reqs, 0);
1270 atomic_set(&imp->imp_inflight, 0);
1271 atomic_set(&imp->imp_replay_inflight, 0);
1272 init_waitqueue_head(&imp->imp_replay_waitq);
1273 atomic_set(&imp->imp_inval_count, 0);
1274 atomic_set(&imp->imp_waiting, 0);
1275 INIT_LIST_HEAD(&imp->imp_conn_list);
1276 init_imp_at(&imp->imp_at);
1278 /* the default magic is V2, will be used in connect RPC, and
1279 * then adjusted according to the flags in request/reply. */
1280 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
1284 EXPORT_SYMBOL(class_new_import);
1286 void class_destroy_import(struct obd_import *import)
1288 LASSERT(import != NULL);
1289 LASSERT(import != LP_POISON);
1291 spin_lock(&import->imp_lock);
1292 import->imp_generation++;
1293 spin_unlock(&import->imp_lock);
1294 class_import_put(import);
1296 EXPORT_SYMBOL(class_destroy_import);
1298 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1300 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1302 spin_lock(&exp->exp_locks_list_guard);
1304 LASSERT(lock->l_exp_refs_nr >= 0);
1306 if (lock->l_exp_refs_target != NULL &&
1307 lock->l_exp_refs_target != exp) {
1308 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1309 exp, lock, lock->l_exp_refs_target);
1311 if ((lock->l_exp_refs_nr ++) == 0) {
1312 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1313 lock->l_exp_refs_target = exp;
1315 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1316 lock, exp, lock->l_exp_refs_nr);
1317 spin_unlock(&exp->exp_locks_list_guard);
1319 EXPORT_SYMBOL(__class_export_add_lock_ref);
1321 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1323 spin_lock(&exp->exp_locks_list_guard);
1324 LASSERT(lock->l_exp_refs_nr > 0);
1325 if (lock->l_exp_refs_target != exp) {
1326 LCONSOLE_WARN("lock %p, "
1327 "mismatching export pointers: %p, %p\n",
1328 lock, lock->l_exp_refs_target, exp);
1330 if (-- lock->l_exp_refs_nr == 0) {
1331 list_del_init(&lock->l_exp_refs_link);
1332 lock->l_exp_refs_target = NULL;
1334 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1335 lock, exp, lock->l_exp_refs_nr);
1336 spin_unlock(&exp->exp_locks_list_guard);
1338 EXPORT_SYMBOL(__class_export_del_lock_ref);
1341 /* A connection defines an export context in which preallocation can
1342 be managed. This releases the export pointer reference, and returns
1343 the export handle, so the export refcount is 1 when this function
1345 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1346 struct obd_uuid *cluuid)
1348 struct obd_export *export;
1349 LASSERT(conn != NULL);
1350 LASSERT(obd != NULL);
1351 LASSERT(cluuid != NULL);
1354 export = class_new_export(obd, cluuid);
1356 RETURN(PTR_ERR(export));
1358 conn->cookie = export->exp_handle.h_cookie;
1359 class_export_put(export);
1361 CDEBUG(D_IOCTL, "connect: client %s, cookie %#llx\n",
1362 cluuid->uuid, conn->cookie);
1365 EXPORT_SYMBOL(class_connect);
1367 /* if export is involved in recovery then clean up related things */
1368 static void class_export_recovery_cleanup(struct obd_export *exp)
1370 struct obd_device *obd = exp->exp_obd;
1372 spin_lock(&obd->obd_recovery_task_lock);
1373 if (obd->obd_recovering) {
1374 if (exp->exp_in_recovery) {
1375 spin_lock(&exp->exp_lock);
1376 exp->exp_in_recovery = 0;
1377 spin_unlock(&exp->exp_lock);
1378 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1379 atomic_dec(&obd->obd_connected_clients);
1382 /* if called during recovery then should update
1383 * obd_stale_clients counter,
1384 * lightweight exports are not counted */
1385 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1386 exp->exp_obd->obd_stale_clients++;
1388 spin_unlock(&obd->obd_recovery_task_lock);
1390 spin_lock(&exp->exp_lock);
1391 /** Cleanup req replay fields */
1392 if (exp->exp_req_replay_needed) {
1393 exp->exp_req_replay_needed = 0;
1395 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1396 atomic_dec(&obd->obd_req_replay_clients);
1399 /** Cleanup lock replay data */
1400 if (exp->exp_lock_replay_needed) {
1401 exp->exp_lock_replay_needed = 0;
1403 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1404 atomic_dec(&obd->obd_lock_replay_clients);
1406 spin_unlock(&exp->exp_lock);
1409 /* This function removes 1-3 references from the export:
1410 * 1 - for export pointer passed
1411 * and if disconnect really need
1412 * 2 - removing from hash
1413 * 3 - in client_unlink_export
1414 * The export pointer passed to this function can destroyed */
1415 int class_disconnect(struct obd_export *export)
1417 int already_disconnected;
1420 if (export == NULL) {
1421 CWARN("attempting to free NULL export %p\n", export);
1425 spin_lock(&export->exp_lock);
1426 already_disconnected = export->exp_disconnected;
1427 export->exp_disconnected = 1;
1428 #ifdef HAVE_SERVER_SUPPORT
1429 /* We hold references of export for uuid hash
1430 * and nid_hash and export link at least. So
1431 * it is safe to call rh*table_remove_fast in
1434 obd_nid_del(export->exp_obd, export);
1435 #endif /* HAVE_SERVER_SUPPORT */
1436 spin_unlock(&export->exp_lock);
1438 /* class_cleanup(), abort_recovery(), and class_fail_export()
1439 * all end up in here, and if any of them race we shouldn't
1440 * call extra class_export_puts(). */
1441 if (already_disconnected)
1442 GOTO(no_disconn, already_disconnected);
1444 CDEBUG(D_IOCTL, "disconnect: cookie %#llx\n",
1445 export->exp_handle.h_cookie);
1447 class_export_recovery_cleanup(export);
1448 class_unlink_export(export);
1450 class_export_put(export);
1453 EXPORT_SYMBOL(class_disconnect);
1455 /* Return non-zero for a fully connected export */
1456 int class_connected_export(struct obd_export *exp)
1461 spin_lock(&exp->exp_lock);
1462 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1463 spin_unlock(&exp->exp_lock);
1467 EXPORT_SYMBOL(class_connected_export);
1469 static void class_disconnect_export_list(struct list_head *list,
1470 enum obd_option flags)
1473 struct obd_export *exp;
1476 /* It's possible that an export may disconnect itself, but
1477 * nothing else will be added to this list.
1479 while ((exp = list_first_entry_or_null(list, struct obd_export,
1480 exp_obd_chain)) != NULL) {
1481 /* need for safe call CDEBUG after obd_disconnect */
1482 class_export_get(exp);
1484 spin_lock(&exp->exp_lock);
1485 exp->exp_flags = flags;
1486 spin_unlock(&exp->exp_lock);
1488 if (obd_uuid_equals(&exp->exp_client_uuid,
1489 &exp->exp_obd->obd_uuid)) {
1491 "exp %p export uuid == obd uuid, don't discon\n",
1493 /* Need to delete this now so we don't end up pointing
1494 * to work_list later when this export is cleaned up. */
1495 list_del_init(&exp->exp_obd_chain);
1496 class_export_put(exp);
1500 class_export_get(exp);
1501 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1502 "last request at %lld\n",
1503 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1504 exp, exp->exp_last_request_time);
1505 /* release one export reference anyway */
1506 rc = obd_disconnect(exp);
1508 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1509 obd_export_nid2str(exp), exp, rc);
1510 class_export_put(exp);
1515 void class_disconnect_exports(struct obd_device *obd)
1517 LIST_HEAD(work_list);
1520 /* Move all of the exports from obd_exports to a work list, en masse. */
1521 spin_lock(&obd->obd_dev_lock);
1522 list_splice_init(&obd->obd_exports, &work_list);
1523 list_splice_init(&obd->obd_delayed_exports, &work_list);
1524 spin_unlock(&obd->obd_dev_lock);
1526 if (!list_empty(&work_list)) {
1527 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1528 "disconnecting them\n", obd->obd_minor, obd);
1529 class_disconnect_export_list(&work_list,
1530 exp_flags_from_obd(obd));
1532 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1533 obd->obd_minor, obd);
1536 EXPORT_SYMBOL(class_disconnect_exports);
1538 /* Remove exports that have not completed recovery.
1540 void class_disconnect_stale_exports(struct obd_device *obd,
1541 int (*test_export)(struct obd_export *))
1543 LIST_HEAD(work_list);
1544 struct obd_export *exp, *n;
1548 spin_lock(&obd->obd_dev_lock);
1549 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1551 /* don't count self-export as client */
1552 if (obd_uuid_equals(&exp->exp_client_uuid,
1553 &exp->exp_obd->obd_uuid))
1556 /* don't evict clients which have no slot in last_rcvd
1557 * (e.g. lightweight connection) */
1558 if (exp->exp_target_data.ted_lr_idx == -1)
1561 spin_lock(&exp->exp_lock);
1562 if (exp->exp_failed || test_export(exp)) {
1563 spin_unlock(&exp->exp_lock);
1566 exp->exp_failed = 1;
1567 spin_unlock(&exp->exp_lock);
1569 list_move(&exp->exp_obd_chain, &work_list);
1571 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1572 obd->obd_name, exp->exp_client_uuid.uuid,
1573 obd_export_nid2str(exp));
1574 print_export_data(exp, "EVICTING", 0, D_HA);
1576 spin_unlock(&obd->obd_dev_lock);
1579 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1580 obd->obd_name, evicted);
1582 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1583 OBD_OPT_ABORT_RECOV);
1586 EXPORT_SYMBOL(class_disconnect_stale_exports);
1588 void class_fail_export(struct obd_export *exp)
1590 int rc, already_failed;
1592 spin_lock(&exp->exp_lock);
1593 already_failed = exp->exp_failed;
1594 exp->exp_failed = 1;
1595 spin_unlock(&exp->exp_lock);
1597 if (already_failed) {
1598 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1599 exp, exp->exp_client_uuid.uuid);
1603 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1604 exp, exp->exp_client_uuid.uuid);
1606 if (obd_dump_on_timeout)
1607 libcfs_debug_dumplog();
1609 /* need for safe call CDEBUG after obd_disconnect */
1610 class_export_get(exp);
1612 /* Most callers into obd_disconnect are removing their own reference
1613 * (request, for example) in addition to the one from the hash table.
1614 * We don't have such a reference here, so make one. */
1615 class_export_get(exp);
1616 rc = obd_disconnect(exp);
1618 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1620 CDEBUG(D_HA, "disconnected export %p/%s\n",
1621 exp, exp->exp_client_uuid.uuid);
1622 class_export_put(exp);
1624 EXPORT_SYMBOL(class_fail_export);
1626 #ifdef HAVE_SERVER_SUPPORT
1628 static int take_first(struct obd_export *exp, void *data)
1630 struct obd_export **expp = data;
1633 /* already have one */
1635 if (exp->exp_failed)
1636 /* Don't want this one */
1638 if (!refcount_inc_not_zero(&exp->exp_handle.h_ref))
1639 /* Cannot get a ref on this one */
1645 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1647 struct lnet_nid nid_key;
1648 struct obd_export *doomed_exp;
1649 int exports_evicted = 0;
1651 libcfs_strnid(&nid_key, nid);
1653 spin_lock(&obd->obd_dev_lock);
1654 /* umount has run already, so evict thread should leave
1655 * its task to umount thread now */
1656 if (obd->obd_stopping) {
1657 spin_unlock(&obd->obd_dev_lock);
1658 return exports_evicted;
1660 spin_unlock(&obd->obd_dev_lock);
1663 while (obd_nid_export_for_each(obd, &nid_key,
1664 take_first, &doomed_exp) > 0) {
1666 LASSERTF(doomed_exp != obd->obd_self_export,
1667 "self-export is hashed by NID?\n");
1669 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative request\n",
1671 obd_uuid2str(&doomed_exp->exp_client_uuid),
1672 obd_export_nid2str(doomed_exp));
1674 class_fail_export(doomed_exp);
1675 class_export_put(doomed_exp);
1680 if (!exports_evicted)
1682 "%s: can't disconnect NID '%s': no exports found\n",
1683 obd->obd_name, nid);
1684 return exports_evicted;
1686 EXPORT_SYMBOL(obd_export_evict_by_nid);
1688 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1690 struct obd_export *doomed_exp = NULL;
1691 struct obd_uuid doomed_uuid;
1692 int exports_evicted = 0;
1694 spin_lock(&obd->obd_dev_lock);
1695 if (obd->obd_stopping) {
1696 spin_unlock(&obd->obd_dev_lock);
1697 return exports_evicted;
1699 spin_unlock(&obd->obd_dev_lock);
1701 obd_str2uuid(&doomed_uuid, uuid);
1702 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1703 CERROR("%s: can't evict myself\n", obd->obd_name);
1704 return exports_evicted;
1707 doomed_exp = obd_uuid_lookup(obd, &doomed_uuid);
1708 if (doomed_exp == NULL) {
1709 CERROR("%s: can't disconnect %s: no exports found\n",
1710 obd->obd_name, uuid);
1712 CWARN("%s: evicting %s at adminstrative request\n",
1713 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1714 class_fail_export(doomed_exp);
1715 class_export_put(doomed_exp);
1716 obd_uuid_del(obd, doomed_exp);
1720 return exports_evicted;
1722 #endif /* HAVE_SERVER_SUPPORT */
1724 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1725 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1726 EXPORT_SYMBOL(class_export_dump_hook);
1729 static void print_export_data(struct obd_export *exp, const char *status,
1730 int locks, int debug_level)
1732 struct ptlrpc_reply_state *rs;
1733 struct ptlrpc_reply_state *first_reply = NULL;
1736 spin_lock(&exp->exp_lock);
1737 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1743 spin_unlock(&exp->exp_lock);
1745 CDEBUG(debug_level, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: "
1746 "%p %s %llu stale:%d\n",
1747 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1748 obd_export_nid2str(exp),
1749 refcount_read(&exp->exp_handle.h_ref),
1750 atomic_read(&exp->exp_rpc_count),
1751 atomic_read(&exp->exp_cb_count),
1752 atomic_read(&exp->exp_locks_count),
1753 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1754 nreplies, first_reply, nreplies > 3 ? "..." : "",
1755 exp->exp_last_committed, !list_empty(&exp->exp_stale_list));
1756 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1757 if (locks && class_export_dump_hook != NULL)
1758 class_export_dump_hook(exp);
1762 void dump_exports(struct obd_device *obd, int locks, int debug_level)
1764 struct obd_export *exp;
1766 spin_lock(&obd->obd_dev_lock);
1767 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1768 print_export_data(exp, "ACTIVE", locks, debug_level);
1769 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1770 print_export_data(exp, "UNLINKED", locks, debug_level);
1771 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1772 print_export_data(exp, "DELAYED", locks, debug_level);
1773 spin_unlock(&obd->obd_dev_lock);
1776 void obd_exports_barrier(struct obd_device *obd)
1779 LASSERT(list_empty(&obd->obd_exports));
1780 spin_lock(&obd->obd_dev_lock);
1781 while (!list_empty(&obd->obd_unlinked_exports)) {
1782 spin_unlock(&obd->obd_dev_lock);
1783 schedule_timeout_uninterruptible(cfs_time_seconds(waited));
1784 if (waited > 5 && is_power_of_2(waited)) {
1785 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1786 "more than %d seconds. "
1787 "The obd refcount = %d. Is it stuck?\n",
1788 obd->obd_name, waited,
1789 atomic_read(&obd->obd_refcount));
1790 dump_exports(obd, 1, D_CONSOLE | D_WARNING);
1793 spin_lock(&obd->obd_dev_lock);
1795 spin_unlock(&obd->obd_dev_lock);
1797 EXPORT_SYMBOL(obd_exports_barrier);
1800 * Add export to the obd_zombe thread and notify it.
1802 static void obd_zombie_export_add(struct obd_export *exp) {
1803 atomic_dec(&obd_stale_export_num);
1804 spin_lock(&exp->exp_obd->obd_dev_lock);
1805 LASSERT(!list_empty(&exp->exp_obd_chain));
1806 list_del_init(&exp->exp_obd_chain);
1807 spin_unlock(&exp->exp_obd->obd_dev_lock);
1809 queue_work(zombie_wq, &exp->exp_zombie_work);
1813 * Add import to the obd_zombe thread and notify it.
1815 static void obd_zombie_import_add(struct obd_import *imp) {
1816 LASSERT(imp->imp_sec == NULL);
1818 queue_work(zombie_wq, &imp->imp_zombie_work);
1822 * wait when obd_zombie import/export queues become empty
1824 void obd_zombie_barrier(void)
1826 flush_workqueue(zombie_wq);
1828 EXPORT_SYMBOL(obd_zombie_barrier);
1831 struct obd_export *obd_stale_export_get(void)
1833 struct obd_export *exp = NULL;
1836 spin_lock(&obd_stale_export_lock);
1837 if (!list_empty(&obd_stale_exports)) {
1838 exp = list_first_entry(&obd_stale_exports,
1839 struct obd_export, exp_stale_list);
1840 list_del_init(&exp->exp_stale_list);
1842 spin_unlock(&obd_stale_export_lock);
1845 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1846 atomic_read(&obd_stale_export_num));
1850 EXPORT_SYMBOL(obd_stale_export_get);
1852 void obd_stale_export_put(struct obd_export *exp)
1856 LASSERT(list_empty(&exp->exp_stale_list));
1857 if (exp->exp_lock_hash &&
1858 atomic_read(&exp->exp_lock_hash->hs_count)) {
1859 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1860 atomic_read(&obd_stale_export_num));
1862 spin_lock_bh(&exp->exp_bl_list_lock);
1863 spin_lock(&obd_stale_export_lock);
1864 /* Add to the tail if there is no blocked locks,
1865 * to the head otherwise. */
1866 if (list_empty(&exp->exp_bl_list))
1867 list_add_tail(&exp->exp_stale_list,
1868 &obd_stale_exports);
1870 list_add(&exp->exp_stale_list,
1871 &obd_stale_exports);
1873 spin_unlock(&obd_stale_export_lock);
1874 spin_unlock_bh(&exp->exp_bl_list_lock);
1876 class_export_put(exp);
1880 EXPORT_SYMBOL(obd_stale_export_put);
1883 * Adjust the position of the export in the stale list,
1884 * i.e. move to the head of the list if is needed.
1886 void obd_stale_export_adjust(struct obd_export *exp)
1888 LASSERT(exp != NULL);
1889 spin_lock_bh(&exp->exp_bl_list_lock);
1890 spin_lock(&obd_stale_export_lock);
1892 if (!list_empty(&exp->exp_stale_list) &&
1893 !list_empty(&exp->exp_bl_list))
1894 list_move(&exp->exp_stale_list, &obd_stale_exports);
1896 spin_unlock(&obd_stale_export_lock);
1897 spin_unlock_bh(&exp->exp_bl_list_lock);
1899 EXPORT_SYMBOL(obd_stale_export_adjust);
1902 * start destroy zombie import/export thread
1904 int obd_zombie_impexp_init(void)
1906 zombie_wq = cfs_cpt_bind_workqueue("obd_zombid", cfs_cpt_tab,
1908 cfs_cpt_number(cfs_cpt_tab));
1910 return IS_ERR(zombie_wq) ? PTR_ERR(zombie_wq) : 0;
1914 * stop destroy zombie import/export thread
1916 void obd_zombie_impexp_stop(void)
1918 destroy_workqueue(zombie_wq);
1919 LASSERT(list_empty(&obd_stale_exports));
1922 /***** Kernel-userspace comm helpers *******/
1924 /* Get length of entire message, including header */
1925 int kuc_len(int payload_len)
1927 return sizeof(struct kuc_hdr) + payload_len;
1929 EXPORT_SYMBOL(kuc_len);
1931 /* Get a pointer to kuc header, given a ptr to the payload
1932 * @param p Pointer to payload area
1933 * @returns Pointer to kuc header
1935 struct kuc_hdr * kuc_ptr(void *p)
1937 struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
1938 LASSERT(lh->kuc_magic == KUC_MAGIC);
1941 EXPORT_SYMBOL(kuc_ptr);
1943 /* Alloc space for a message, and fill in header
1944 * @return Pointer to payload area
1946 void *kuc_alloc(int payload_len, int transport, int type)
1949 int len = kuc_len(payload_len);
1953 return ERR_PTR(-ENOMEM);
1955 lh->kuc_magic = KUC_MAGIC;
1956 lh->kuc_transport = transport;
1957 lh->kuc_msgtype = type;
1958 lh->kuc_msglen = len;
1960 return (void *)(lh + 1);
1962 EXPORT_SYMBOL(kuc_alloc);
1964 /* Takes pointer to payload area */
1965 void kuc_free(void *p, int payload_len)
1967 struct kuc_hdr *lh = kuc_ptr(p);
1968 OBD_FREE(lh, kuc_len(payload_len));
1970 EXPORT_SYMBOL(kuc_free);
1972 struct obd_request_slot_waiter {
1973 struct list_head orsw_entry;
1974 wait_queue_head_t orsw_waitq;
1978 static bool obd_request_slot_avail(struct client_obd *cli,
1979 struct obd_request_slot_waiter *orsw)
1983 spin_lock(&cli->cl_loi_list_lock);
1984 avail = !!list_empty(&orsw->orsw_entry);
1985 spin_unlock(&cli->cl_loi_list_lock);
1991 * For network flow control, the RPC sponsor needs to acquire a credit
1992 * before sending the RPC. The credits count for a connection is defined
1993 * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
1994 * the subsequent RPC sponsors need to wait until others released their
1995 * credits, or the administrator increased the "cl_max_rpcs_in_flight".
1997 int obd_get_request_slot(struct client_obd *cli)
1999 struct obd_request_slot_waiter orsw;
2002 spin_lock(&cli->cl_loi_list_lock);
2003 if (cli->cl_rpcs_in_flight < cli->cl_max_rpcs_in_flight) {
2004 cli->cl_rpcs_in_flight++;
2005 spin_unlock(&cli->cl_loi_list_lock);
2009 init_waitqueue_head(&orsw.orsw_waitq);
2010 list_add_tail(&orsw.orsw_entry, &cli->cl_flight_waiters);
2011 orsw.orsw_signaled = false;
2012 spin_unlock(&cli->cl_loi_list_lock);
2014 rc = l_wait_event_abortable(orsw.orsw_waitq,
2015 obd_request_slot_avail(cli, &orsw) ||
2016 orsw.orsw_signaled);
2018 /* Here, we must take the lock to avoid the on-stack 'orsw' to be
2019 * freed but other (such as obd_put_request_slot) is using it. */
2020 spin_lock(&cli->cl_loi_list_lock);
2022 if (!orsw.orsw_signaled) {
2023 if (list_empty(&orsw.orsw_entry))
2024 cli->cl_rpcs_in_flight--;
2026 list_del(&orsw.orsw_entry);
2031 if (orsw.orsw_signaled) {
2032 LASSERT(list_empty(&orsw.orsw_entry));
2036 spin_unlock(&cli->cl_loi_list_lock);
2040 EXPORT_SYMBOL(obd_get_request_slot);
2042 void obd_put_request_slot(struct client_obd *cli)
2044 struct obd_request_slot_waiter *orsw;
2046 spin_lock(&cli->cl_loi_list_lock);
2047 cli->cl_rpcs_in_flight--;
2049 /* If there is free slot, wakeup the first waiter. */
2050 if (!list_empty(&cli->cl_flight_waiters) &&
2051 likely(cli->cl_rpcs_in_flight < cli->cl_max_rpcs_in_flight)) {
2052 orsw = list_first_entry(&cli->cl_flight_waiters,
2053 struct obd_request_slot_waiter,
2055 list_del_init(&orsw->orsw_entry);
2056 cli->cl_rpcs_in_flight++;
2057 wake_up(&orsw->orsw_waitq);
2059 spin_unlock(&cli->cl_loi_list_lock);
2061 EXPORT_SYMBOL(obd_put_request_slot);
2063 __u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
2065 return cli->cl_max_rpcs_in_flight;
2067 EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
2069 int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
2071 struct obd_request_slot_waiter *orsw;
2077 if (max > OBD_MAX_RIF_MAX || max < 1)
2080 CDEBUG(D_INFO, "%s: max = %hu max_mod = %u rif = %u\n",
2081 cli->cl_import->imp_obd->obd_name, max,
2082 cli->cl_max_mod_rpcs_in_flight, cli->cl_max_rpcs_in_flight);
2084 if (strcmp(cli->cl_import->imp_obd->obd_type->typ_name,
2085 LUSTRE_MDC_NAME) == 0) {
2086 /* adjust max_mod_rpcs_in_flight to ensure it is always
2087 * strictly lower that max_rpcs_in_flight */
2089 CERROR("%s: cannot set mdc.*.max_rpcs_in_flight=1\n",
2090 cli->cl_import->imp_obd->obd_name);
2093 if (max <= cli->cl_max_mod_rpcs_in_flight) {
2094 rc = obd_set_max_mod_rpcs_in_flight(cli, max - 1);
2100 spin_lock(&cli->cl_loi_list_lock);
2101 old = cli->cl_max_rpcs_in_flight;
2102 cli->cl_max_rpcs_in_flight = max;
2103 client_adjust_max_dirty(cli);
2107 /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
2108 for (i = 0; i < diff; i++) {
2109 orsw = list_first_entry_or_null(&cli->cl_loi_read_list,
2110 struct obd_request_slot_waiter,
2115 list_del_init(&orsw->orsw_entry);
2116 cli->cl_rpcs_in_flight++;
2117 wake_up(&orsw->orsw_waitq);
2119 spin_unlock(&cli->cl_loi_list_lock);
2123 EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
2125 __u16 obd_get_max_mod_rpcs_in_flight(struct client_obd *cli)
2127 return cli->cl_max_mod_rpcs_in_flight;
2129 EXPORT_SYMBOL(obd_get_max_mod_rpcs_in_flight);
2131 int obd_set_max_mod_rpcs_in_flight(struct client_obd *cli, __u16 max)
2133 struct obd_connect_data *ocd;
2137 if (max > OBD_MAX_RIF_MAX || max < 1)
2140 ocd = &cli->cl_import->imp_connect_data;
2141 CDEBUG(D_INFO, "%s: max = %hu flags = %llx, max_mod = %u rif = %u\n",
2142 cli->cl_import->imp_obd->obd_name, max, ocd->ocd_connect_flags,
2143 ocd->ocd_maxmodrpcs, cli->cl_max_rpcs_in_flight);
2145 if (max == OBD_MAX_RIF_MAX)
2146 max = OBD_MAX_RIF_MAX - 1;
2148 /* Cannot exceed or equal max_rpcs_in_flight. If we are asked to
2149 * increase this value, also bump up max_rpcs_in_flight to match.
2151 if (max >= cli->cl_max_rpcs_in_flight) {
2153 "%s: increasing max_rpcs_in_flight=%hu to allow larger max_mod_rpcs_in_flight=%u\n",
2154 cli->cl_import->imp_obd->obd_name, max + 1, max);
2155 obd_set_max_rpcs_in_flight(cli, max + 1);
2158 /* cannot exceed max modify RPCs in flight supported by the server,
2159 * but verify ocd_connect_flags is at least initialized first. If
2160 * not, allow it and fix value later in ptlrpc_connect_set_flags().
2162 if (!ocd->ocd_connect_flags) {
2163 maxmodrpcs = cli->cl_max_rpcs_in_flight - 1;
2164 } else if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
2165 maxmodrpcs = ocd->ocd_maxmodrpcs;
2166 if (maxmodrpcs == 0) { /* connection not finished yet */
2167 maxmodrpcs = cli->cl_max_rpcs_in_flight - 1;
2169 "%s: partial connect, assume maxmodrpcs=%hu\n",
2170 cli->cl_import->imp_obd->obd_name, maxmodrpcs);
2175 if (max > maxmodrpcs) {
2176 CERROR("%s: can't set max_mod_rpcs_in_flight=%hu higher than mdt.*.max_mod_rpcs_in_flight=%hu returned by the MDT server at connection.\n",
2177 cli->cl_import->imp_obd->obd_name,
2182 spin_lock_irq(&cli->cl_mod_rpcs_waitq.lock);
2184 prev = cli->cl_max_mod_rpcs_in_flight;
2185 cli->cl_max_mod_rpcs_in_flight = max;
2187 /* wakeup waiters if limit has been increased */
2188 if (cli->cl_max_mod_rpcs_in_flight > prev)
2189 wake_up_locked(&cli->cl_mod_rpcs_waitq);
2191 spin_unlock_irq(&cli->cl_mod_rpcs_waitq.lock);
2195 EXPORT_SYMBOL(obd_set_max_mod_rpcs_in_flight);
2197 int obd_mod_rpc_stats_seq_show(struct client_obd *cli,
2198 struct seq_file *seq)
2200 unsigned long mod_tot = 0, mod_cum;
2203 spin_lock_irq(&cli->cl_mod_rpcs_waitq.lock);
2204 lprocfs_stats_header(seq, ktime_get_real(), cli->cl_mod_rpcs_init, 25,
2206 seq_printf(seq, "modify_RPCs_in_flight: %hu\n",
2207 cli->cl_mod_rpcs_in_flight);
2209 seq_printf(seq, "\n\t\t\tmodify\n");
2210 seq_printf(seq, "rpcs in flight rpcs %% cum %%\n");
2212 mod_tot = lprocfs_oh_sum(&cli->cl_mod_rpcs_hist);
2215 for (i = 0; i < OBD_HIST_MAX; i++) {
2216 unsigned long mod = cli->cl_mod_rpcs_hist.oh_buckets[i];
2219 seq_printf(seq, "%d:\t\t%10lu %3u %3u\n",
2220 i, mod, pct(mod, mod_tot),
2221 pct(mod_cum, mod_tot));
2222 if (mod_cum == mod_tot)
2226 spin_unlock_irq(&cli->cl_mod_rpcs_waitq.lock);
2230 EXPORT_SYMBOL(obd_mod_rpc_stats_seq_show);
2232 /* The number of modify RPCs sent in parallel is limited
2233 * because the server has a finite number of slots per client to
2234 * store request result and ensure reply reconstruction when needed.
2235 * On the client, this limit is stored in cl_max_mod_rpcs_in_flight
2236 * that takes into account server limit and cl_max_rpcs_in_flight
2238 * On the MDC client, to avoid a potential deadlock (see Bugzilla 3462),
2239 * one close request is allowed above the maximum.
2242 struct client_obd *cli;
2244 wait_queue_entry_t wqe;
2246 static int claim_mod_rpc_function(wait_queue_entry_t *wq_entry,
2247 unsigned int mode, int flags, void *key)
2249 struct mod_waiter *w = container_of(wq_entry, struct mod_waiter, wqe);
2250 struct client_obd *cli = w->cli;
2251 bool close_req = w->close_req;
2255 /* As woken_wake_function() doesn't remove us from the wait_queue,
2256 * we could get called twice for the same thread - take care.
2258 if (wq_entry->flags & WQ_FLAG_WOKEN)
2259 /* Already woke this thread, don't try again */
2262 /* A slot is available if
2263 * - number of modify RPCs in flight is less than the max
2264 * - it's a close RPC and no other close request is in flight
2266 avail = cli->cl_mod_rpcs_in_flight < cli->cl_max_mod_rpcs_in_flight ||
2267 (close_req && cli->cl_close_rpcs_in_flight == 0);
2269 cli->cl_mod_rpcs_in_flight++;
2271 cli->cl_close_rpcs_in_flight++;
2272 ret = woken_wake_function(wq_entry, mode, flags, key);
2273 } else if (cli->cl_close_rpcs_in_flight)
2274 /* No other waiter could be woken */
2276 else if (key == NULL)
2277 /* This was not a wakeup from a close completion, so there is no
2278 * point seeing if there are close waiters to be woken
2282 /* There might be be a close we could wake, keep looking */
2287 /* Get a modify RPC slot from the obd client @cli according
2288 * to the kind of operation @opc that is going to be sent
2289 * and the intent @it of the operation if it applies.
2290 * If the maximum number of modify RPCs in flight is reached
2291 * the thread is put to sleep.
2292 * Returns the tag to be set in the request message. Tag 0
2293 * is reserved for non-modifying requests.
2295 __u16 obd_get_mod_rpc_slot(struct client_obd *cli, __u32 opc)
2297 struct mod_waiter wait = {
2299 .close_req = (opc == MDS_CLOSE),
2303 init_wait(&wait.wqe);
2304 wait.wqe.func = claim_mod_rpc_function;
2306 spin_lock_irq(&cli->cl_mod_rpcs_waitq.lock);
2307 __add_wait_queue(&cli->cl_mod_rpcs_waitq, &wait.wqe);
2308 /* This wakeup will only succeed if the maximums haven't
2309 * been reached. If that happens, WQ_FLAG_WOKEN will be cleared
2310 * and there will be no need to wait.
2312 wake_up_locked(&cli->cl_mod_rpcs_waitq);
2313 if (!(wait.wqe.flags & WQ_FLAG_WOKEN)) {
2314 spin_unlock_irq(&cli->cl_mod_rpcs_waitq.lock);
2315 wait_woken(&wait.wqe, TASK_UNINTERRUPTIBLE,
2316 MAX_SCHEDULE_TIMEOUT);
2317 spin_lock_irq(&cli->cl_mod_rpcs_waitq.lock);
2319 __remove_wait_queue(&cli->cl_mod_rpcs_waitq, &wait.wqe);
2321 max = cli->cl_max_mod_rpcs_in_flight;
2322 lprocfs_oh_tally(&cli->cl_mod_rpcs_hist,
2323 cli->cl_mod_rpcs_in_flight);
2324 /* find a free tag */
2325 i = find_first_zero_bit(cli->cl_mod_tag_bitmap,
2327 LASSERT(i < OBD_MAX_RIF_MAX);
2328 LASSERT(!test_and_set_bit(i, cli->cl_mod_tag_bitmap));
2329 spin_unlock_irq(&cli->cl_mod_rpcs_waitq.lock);
2330 /* tag 0 is reserved for non-modify RPCs */
2333 "%s: modify RPC slot %u is allocated opc %u, max %hu\n",
2334 cli->cl_import->imp_obd->obd_name,
2339 EXPORT_SYMBOL(obd_get_mod_rpc_slot);
2341 /* Put a modify RPC slot from the obd client @cli according
2342 * to the kind of operation @opc that has been sent.
2344 void obd_put_mod_rpc_slot(struct client_obd *cli, __u32 opc, __u16 tag)
2346 bool close_req = false;
2351 if (opc == MDS_CLOSE)
2354 spin_lock_irq(&cli->cl_mod_rpcs_waitq.lock);
2355 cli->cl_mod_rpcs_in_flight--;
2357 cli->cl_close_rpcs_in_flight--;
2358 /* release the tag in the bitmap */
2359 LASSERT(tag - 1 < OBD_MAX_RIF_MAX);
2360 LASSERT(test_and_clear_bit(tag - 1, cli->cl_mod_tag_bitmap) != 0);
2361 __wake_up_locked_key(&cli->cl_mod_rpcs_waitq, TASK_NORMAL,
2363 spin_unlock_irq(&cli->cl_mod_rpcs_waitq.lock);
2365 EXPORT_SYMBOL(obd_put_mod_rpc_slot);