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/
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/workqueue.h>
42 #include <lustre_compat.h>
43 #include <obd_class.h>
44 #include <lustre_log.h>
45 #include <lprocfs_status.h>
46 #include <lustre_disk.h>
47 #include <lustre_kernelcomm.h>
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 static struct kobj_type class_ktype;
54 static struct workqueue_struct *zombie_wq;
56 static void obd_zombie_export_add(struct obd_export *exp);
57 static void obd_zombie_import_add(struct obd_import *imp);
58 static void print_export_data(struct obd_export *exp,
59 const char *status, int locks, int debug_level);
61 static LIST_HEAD(obd_stale_exports);
62 static DEFINE_SPINLOCK(obd_stale_export_lock);
63 static atomic_t obd_stale_export_num = ATOMIC_INIT(0);
65 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
66 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
69 * support functions: we could use inter-module communication, but this
70 * is more portable to other OS's
72 static struct obd_device *obd_device_alloc(void)
74 struct obd_device *obd;
76 OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, GFP_NOFS);
78 obd->obd_magic = OBD_DEVICE_MAGIC;
83 static void obd_device_free(struct obd_device *obd)
86 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
87 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
88 if (obd->obd_namespace != NULL) {
89 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
90 obd, obd->obd_namespace, obd->obd_force);
93 lu_ref_fini(&obd->obd_reference);
94 OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
97 struct obd_type *class_search_type(const char *name)
99 struct kobject *kobj = kset_find_obj(lustre_kset, name);
101 if (kobj && kobj->ktype == &class_ktype)
102 return container_of(kobj, struct obd_type, typ_kobj);
107 EXPORT_SYMBOL(class_search_type);
109 struct obd_type *class_get_type(const char *name)
111 struct obd_type *type;
113 type = class_search_type(name);
114 #ifdef HAVE_MODULE_LOADING_SUPPORT
116 const char *modname = name;
118 #ifdef HAVE_SERVER_SUPPORT
119 if (strcmp(modname, "obdfilter") == 0)
122 if (strcmp(modname, LUSTRE_LWP_NAME) == 0)
123 modname = LUSTRE_OSP_NAME;
125 if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME)))
126 modname = LUSTRE_MDT_NAME;
127 #endif /* HAVE_SERVER_SUPPORT */
129 if (!request_module("%s", modname)) {
130 CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
131 type = class_search_type(name);
133 LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
139 if (try_module_get(type->typ_dt_ops->o_owner)) {
140 atomic_inc(&type->typ_refcnt);
141 /* class_search_type() returned a counted reference,
142 * but we don't need that count any more as
143 * we have one through typ_refcnt.
145 kobject_put(&type->typ_kobj);
147 kobject_put(&type->typ_kobj);
154 void class_put_type(struct obd_type *type)
157 module_put(type->typ_dt_ops->o_owner);
158 atomic_dec(&type->typ_refcnt);
161 static void class_sysfs_release(struct kobject *kobj)
163 struct obd_type *type = container_of(kobj, struct obd_type, typ_kobj);
165 debugfs_remove_recursive(type->typ_debugfs_entry);
166 type->typ_debugfs_entry = NULL;
169 lu_device_type_fini(type->typ_lu);
171 #ifdef CONFIG_PROC_FS
172 if (type->typ_name && type->typ_procroot)
173 remove_proc_subtree(type->typ_name, proc_lustre_root);
175 OBD_FREE(type, sizeof(*type));
178 static struct kobj_type class_ktype = {
179 .sysfs_ops = &lustre_sysfs_ops,
180 .release = class_sysfs_release,
183 #ifdef HAVE_SERVER_SUPPORT
184 struct obd_type *class_add_symlinks(const char *name, bool enable_proc)
186 struct dentry *symlink;
187 struct obd_type *type;
190 type = class_search_type(name);
192 kobject_put(&type->typ_kobj);
193 return ERR_PTR(-EEXIST);
196 OBD_ALLOC(type, sizeof(*type));
198 return ERR_PTR(-ENOMEM);
200 type->typ_kobj.kset = lustre_kset;
201 rc = kobject_init_and_add(&type->typ_kobj, &class_ktype,
202 &lustre_kset->kobj, "%s", name);
206 symlink = debugfs_create_dir(name, debugfs_lustre_root);
207 type->typ_debugfs_entry = symlink;
208 type->typ_sym_filter = true;
211 type->typ_procroot = lprocfs_register(name, proc_lustre_root,
213 if (IS_ERR(type->typ_procroot)) {
214 CERROR("%s: can't create compat proc entry: %d\n",
215 name, (int)PTR_ERR(type->typ_procroot));
216 type->typ_procroot = NULL;
222 EXPORT_SYMBOL(class_add_symlinks);
223 #endif /* HAVE_SERVER_SUPPORT */
225 #define CLASS_MAX_NAME 1024
227 int class_register_type(const struct obd_ops *dt_ops,
228 const struct md_ops *md_ops,
229 bool enable_proc, struct lprocfs_vars *vars,
230 const char *name, struct lu_device_type *ldt)
232 struct obd_type *type;
237 LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
239 type = class_search_type(name);
241 #ifdef HAVE_SERVER_SUPPORT
242 if (type->typ_sym_filter)
244 #endif /* HAVE_SERVER_SUPPORT */
245 kobject_put(&type->typ_kobj);
246 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
250 OBD_ALLOC(type, sizeof(*type));
254 type->typ_lu = ldt ? OBD_LU_TYPE_SETUP : NULL;
255 type->typ_kobj.kset = lustre_kset;
256 kobject_init(&type->typ_kobj, &class_ktype);
257 #ifdef HAVE_SERVER_SUPPORT
259 #endif /* HAVE_SERVER_SUPPORT */
261 type->typ_dt_ops = dt_ops;
262 type->typ_md_ops = md_ops;
264 #ifdef HAVE_SERVER_SUPPORT
265 if (type->typ_sym_filter) {
266 type->typ_sym_filter = false;
267 kobject_put(&type->typ_kobj);
271 #ifdef CONFIG_PROC_FS
272 if (enable_proc && !type->typ_procroot) {
273 type->typ_procroot = lprocfs_register(name,
276 if (IS_ERR(type->typ_procroot)) {
277 rc = PTR_ERR(type->typ_procroot);
278 type->typ_procroot = NULL;
283 type->typ_debugfs_entry = debugfs_create_dir(name, debugfs_lustre_root);
284 ldebugfs_add_vars(type->typ_debugfs_entry, vars, type);
286 rc = kobject_add(&type->typ_kobj, &lustre_kset->kobj, "%s", name);
289 #ifdef HAVE_SERVER_SUPPORT
293 rc = lu_device_type_init(ldt);
294 smp_store_release(&type->typ_lu, rc ? NULL : ldt);
295 wake_up_var(&type->typ_lu);
303 kobject_put(&type->typ_kobj);
307 EXPORT_SYMBOL(class_register_type);
309 int class_unregister_type(const char *name)
311 struct obd_type *type = class_search_type(name);
316 CERROR("unknown obd type\n");
320 if (atomic_read(&type->typ_refcnt)) {
321 CERROR("type %s has refcount (%d)\n", name,
322 atomic_read(&type->typ_refcnt));
323 /* This is a bad situation, let's make the best of it */
324 /* Remove ops, but leave the name for debugging */
325 type->typ_dt_ops = NULL;
326 type->typ_md_ops = NULL;
327 GOTO(out_put, rc = -EBUSY);
330 /* Put the final ref */
331 kobject_put(&type->typ_kobj);
333 /* Put the ref returned by class_search_type() */
334 kobject_put(&type->typ_kobj);
337 } /* class_unregister_type */
338 EXPORT_SYMBOL(class_unregister_type);
341 * Create a new obd device.
343 * Allocate the new obd_device and initialize it.
345 * \param[in] type_name obd device type string.
346 * \param[in] name obd device name.
347 * \param[in] uuid obd device UUID
349 * \retval newdev pointer to created obd_device
350 * \retval ERR_PTR(errno) on error
352 struct obd_device *class_newdev(const char *type_name, const char *name,
355 struct obd_device *newdev;
356 struct obd_type *type = NULL;
359 if (strlen(name) >= MAX_OBD_NAME) {
360 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
361 RETURN(ERR_PTR(-EINVAL));
364 type = class_get_type(type_name);
366 CERROR("OBD: unknown type: %s\n", type_name);
367 RETURN(ERR_PTR(-ENODEV));
370 newdev = obd_device_alloc();
371 if (newdev == NULL) {
372 class_put_type(type);
373 RETURN(ERR_PTR(-ENOMEM));
375 LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
376 strncpy(newdev->obd_name, name, sizeof(newdev->obd_name) - 1);
377 newdev->obd_type = type;
378 newdev->obd_minor = -1;
380 rwlock_init(&newdev->obd_pool_lock);
381 newdev->obd_pool_limit = 0;
382 newdev->obd_pool_slv = 0;
384 INIT_LIST_HEAD(&newdev->obd_exports);
385 INIT_LIST_HEAD(&newdev->obd_unlinked_exports);
386 INIT_LIST_HEAD(&newdev->obd_delayed_exports);
387 INIT_LIST_HEAD(&newdev->obd_exports_timed);
388 INIT_LIST_HEAD(&newdev->obd_nid_stats);
389 spin_lock_init(&newdev->obd_nid_lock);
390 spin_lock_init(&newdev->obd_dev_lock);
391 mutex_init(&newdev->obd_dev_mutex);
392 spin_lock_init(&newdev->obd_osfs_lock);
393 /* newdev->obd_osfs_age must be set to a value in the distant
394 * past to guarantee a fresh statfs is fetched on mount. */
395 newdev->obd_osfs_age = ktime_get_seconds() - 1000;
397 /* XXX belongs in setup not attach */
398 init_rwsem(&newdev->obd_observer_link_sem);
400 spin_lock_init(&newdev->obd_recovery_task_lock);
401 init_waitqueue_head(&newdev->obd_next_transno_waitq);
402 init_waitqueue_head(&newdev->obd_evict_inprogress_waitq);
403 INIT_LIST_HEAD(&newdev->obd_req_replay_queue);
404 INIT_LIST_HEAD(&newdev->obd_lock_replay_queue);
405 INIT_LIST_HEAD(&newdev->obd_final_req_queue);
406 INIT_LIST_HEAD(&newdev->obd_evict_list);
407 INIT_LIST_HEAD(&newdev->obd_lwp_list);
409 llog_group_init(&newdev->obd_olg);
410 /* Detach drops this */
411 atomic_set(&newdev->obd_refcount, 1);
412 lu_ref_init(&newdev->obd_reference);
413 lu_ref_add(&newdev->obd_reference, "newdev", newdev);
415 newdev->obd_conn_inprogress = 0;
417 strncpy(newdev->obd_uuid.uuid, uuid, UUID_MAX);
419 CDEBUG(D_IOCTL, "Allocate new device %s (%p)\n",
420 newdev->obd_name, newdev);
428 * \param[in] obd obd_device to be freed
432 void class_free_dev(struct obd_device *obd)
434 struct obd_type *obd_type = obd->obd_type;
436 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x "
437 "!= %08x\n", obd, obd->obd_magic, OBD_DEVICE_MAGIC);
438 LASSERTF(obd->obd_minor == -1 || obd_devs[obd->obd_minor] == obd,
439 "obd %p != obd_devs[%d] %p\n",
440 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
441 LASSERTF(atomic_read(&obd->obd_refcount) == 0,
442 "obd_refcount should be 0, not %d\n",
443 atomic_read(&obd->obd_refcount));
444 LASSERT(obd_type != NULL);
446 CDEBUG(D_INFO, "Release obd device %s obd_type name = %s\n",
447 obd->obd_name, obd->obd_type->typ_name);
449 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
450 obd->obd_name, obd->obd_uuid.uuid);
451 if (obd->obd_stopping) {
454 /* If we're not stopping, we were never set up */
455 err = obd_cleanup(obd);
457 CERROR("Cleanup %s returned %d\n",
461 obd_device_free(obd);
463 class_put_type(obd_type);
467 * Unregister obd device.
469 * Free slot in obd_dev[] used by \a obd.
471 * \param[in] new_obd obd_device to be unregistered
475 void class_unregister_device(struct obd_device *obd)
477 write_lock(&obd_dev_lock);
478 if (obd->obd_minor >= 0) {
479 LASSERT(obd_devs[obd->obd_minor] == obd);
480 obd_devs[obd->obd_minor] = NULL;
483 write_unlock(&obd_dev_lock);
487 * Register obd device.
489 * Find free slot in obd_devs[], fills it with \a new_obd.
491 * \param[in] new_obd obd_device to be registered
494 * \retval -EEXIST device with this name is registered
495 * \retval -EOVERFLOW obd_devs[] is full
497 int class_register_device(struct obd_device *new_obd)
501 int new_obd_minor = 0;
502 bool minor_assign = false;
503 bool retried = false;
506 write_lock(&obd_dev_lock);
507 for (i = 0; i < class_devno_max(); i++) {
508 struct obd_device *obd = class_num2obd(i);
511 (strcmp(new_obd->obd_name, obd->obd_name) == 0)) {
514 write_unlock(&obd_dev_lock);
516 /* the obd_device could be waited to be
517 * destroyed by the "obd_zombie_impexp_thread".
519 obd_zombie_barrier();
524 CERROR("%s: already exists, won't add\n",
526 /* in case we found a free slot before duplicate */
527 minor_assign = false;
531 if (!minor_assign && obd == NULL) {
538 new_obd->obd_minor = new_obd_minor;
539 LASSERTF(obd_devs[new_obd_minor] == NULL, "obd_devs[%d] "
540 "%p\n", new_obd_minor, obd_devs[new_obd_minor]);
541 obd_devs[new_obd_minor] = new_obd;
545 CERROR("%s: all %u/%u devices used, increase "
546 "MAX_OBD_DEVICES: rc = %d\n", new_obd->obd_name,
547 i, class_devno_max(), ret);
550 write_unlock(&obd_dev_lock);
555 static int class_name2dev_nolock(const char *name)
562 for (i = 0; i < class_devno_max(); i++) {
563 struct obd_device *obd = class_num2obd(i);
565 if (obd && strcmp(name, obd->obd_name) == 0) {
566 /* Make sure we finished attaching before we give
567 out any references */
568 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
569 if (obd->obd_attached) {
579 int class_name2dev(const char *name)
586 read_lock(&obd_dev_lock);
587 i = class_name2dev_nolock(name);
588 read_unlock(&obd_dev_lock);
592 EXPORT_SYMBOL(class_name2dev);
594 struct obd_device *class_name2obd(const char *name)
596 int dev = class_name2dev(name);
598 if (dev < 0 || dev > class_devno_max())
600 return class_num2obd(dev);
602 EXPORT_SYMBOL(class_name2obd);
604 int class_uuid2dev_nolock(struct obd_uuid *uuid)
608 for (i = 0; i < class_devno_max(); i++) {
609 struct obd_device *obd = class_num2obd(i);
611 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
612 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
620 int class_uuid2dev(struct obd_uuid *uuid)
624 read_lock(&obd_dev_lock);
625 i = class_uuid2dev_nolock(uuid);
626 read_unlock(&obd_dev_lock);
630 EXPORT_SYMBOL(class_uuid2dev);
632 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
634 int dev = class_uuid2dev(uuid);
637 return class_num2obd(dev);
639 EXPORT_SYMBOL(class_uuid2obd);
642 * Get obd device from ::obd_devs[]
644 * \param num [in] array index
646 * \retval NULL if ::obd_devs[\a num] does not contains an obd device
647 * otherwise return the obd device there.
649 struct obd_device *class_num2obd(int num)
651 struct obd_device *obd = NULL;
653 if (num < class_devno_max()) {
658 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
659 "%p obd_magic %08x != %08x\n",
660 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
661 LASSERTF(obd->obd_minor == num,
662 "%p obd_minor %0d != %0d\n",
663 obd, obd->obd_minor, num);
668 EXPORT_SYMBOL(class_num2obd);
671 * Find obd in obd_dev[] by name or uuid.
673 * Increment obd's refcount if found.
675 * \param[in] str obd name or uuid
677 * \retval NULL if not found
678 * \retval target pointer to found obd_device
680 struct obd_device *class_dev_by_str(const char *str)
682 struct obd_device *target = NULL;
683 struct obd_uuid tgtuuid;
686 obd_str2uuid(&tgtuuid, str);
688 read_lock(&obd_dev_lock);
689 rc = class_uuid2dev_nolock(&tgtuuid);
691 rc = class_name2dev_nolock(str);
694 target = class_num2obd(rc);
697 class_incref(target, "find", current);
698 read_unlock(&obd_dev_lock);
702 EXPORT_SYMBOL(class_dev_by_str);
705 * Get obd devices count. Device in any
707 * \retval obd device count
709 int get_devices_count(void)
711 int index, max_index = class_devno_max(), dev_count = 0;
713 read_lock(&obd_dev_lock);
714 for (index = 0; index <= max_index; index++) {
715 struct obd_device *obd = class_num2obd(index);
719 read_unlock(&obd_dev_lock);
723 EXPORT_SYMBOL(get_devices_count);
725 void class_obd_list(void)
730 read_lock(&obd_dev_lock);
731 for (i = 0; i < class_devno_max(); i++) {
732 struct obd_device *obd = class_num2obd(i);
736 if (obd->obd_stopping)
738 else if (obd->obd_set_up)
740 else if (obd->obd_attached)
744 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
745 i, status, obd->obd_type->typ_name,
746 obd->obd_name, obd->obd_uuid.uuid,
747 atomic_read(&obd->obd_refcount));
749 read_unlock(&obd_dev_lock);
752 /* Search for a client OBD connected to tgt_uuid. If grp_uuid is
753 * specified, then only the client with that uuid is returned,
754 * otherwise any client connected to the tgt is returned.
756 struct obd_device *class_find_client_obd(struct obd_uuid *tgt_uuid,
757 const char *type_name,
758 struct obd_uuid *grp_uuid)
762 read_lock(&obd_dev_lock);
763 for (i = 0; i < class_devno_max(); i++) {
764 struct obd_device *obd = class_num2obd(i);
768 if ((strncmp(obd->obd_type->typ_name, type_name,
769 strlen(type_name)) == 0)) {
770 if (obd_uuid_equals(tgt_uuid,
771 &obd->u.cli.cl_target_uuid) &&
772 ((grp_uuid)? obd_uuid_equals(grp_uuid,
773 &obd->obd_uuid) : 1)) {
774 read_unlock(&obd_dev_lock);
779 read_unlock(&obd_dev_lock);
783 EXPORT_SYMBOL(class_find_client_obd);
785 /* Iterate the obd_device list looking devices have grp_uuid. Start
786 * searching at *next, and if a device is found, the next index to look
787 * at is saved in *next. If next is NULL, then the first matching device
788 * will always be returned.
790 struct obd_device *class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
796 else if (*next >= 0 && *next < class_devno_max())
801 read_lock(&obd_dev_lock);
802 for (; i < class_devno_max(); i++) {
803 struct obd_device *obd = class_num2obd(i);
807 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
810 read_unlock(&obd_dev_lock);
814 read_unlock(&obd_dev_lock);
818 EXPORT_SYMBOL(class_devices_in_group);
821 * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
822 * adjust sptlrpc settings accordingly.
824 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
826 struct obd_device *obd;
830 LASSERT(namelen > 0);
832 read_lock(&obd_dev_lock);
833 for (i = 0; i < class_devno_max(); i++) {
834 obd = class_num2obd(i);
836 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
839 /* only notify mdc, osc, osp, lwp, mdt, ost
840 * because only these have a -sptlrpc llog */
841 type = obd->obd_type->typ_name;
842 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
843 strcmp(type, LUSTRE_OSC_NAME) != 0 &&
844 strcmp(type, LUSTRE_OSP_NAME) != 0 &&
845 strcmp(type, LUSTRE_LWP_NAME) != 0 &&
846 strcmp(type, LUSTRE_MDT_NAME) != 0 &&
847 strcmp(type, LUSTRE_OST_NAME) != 0)
850 if (strncmp(obd->obd_name, fsname, namelen))
853 class_incref(obd, __FUNCTION__, obd);
854 read_unlock(&obd_dev_lock);
855 rc2 = obd_set_info_async(NULL, obd->obd_self_export,
856 sizeof(KEY_SPTLRPC_CONF),
857 KEY_SPTLRPC_CONF, 0, NULL, NULL);
859 class_decref(obd, __FUNCTION__, obd);
860 read_lock(&obd_dev_lock);
862 read_unlock(&obd_dev_lock);
865 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
867 void obd_cleanup_caches(void)
870 if (obd_device_cachep) {
871 kmem_cache_destroy(obd_device_cachep);
872 obd_device_cachep = NULL;
878 int obd_init_caches(void)
883 LASSERT(obd_device_cachep == NULL);
884 obd_device_cachep = kmem_cache_create_usercopy("ll_obd_dev_cache",
885 sizeof(struct obd_device),
886 0, 0, 0, sizeof(struct obd_device), NULL);
887 if (!obd_device_cachep)
888 GOTO(out, rc = -ENOMEM);
892 obd_cleanup_caches();
896 static const char export_handle_owner[] = "export";
898 /* map connection to client */
899 struct obd_export *class_conn2export(struct lustre_handle *conn)
901 struct obd_export *export;
905 CDEBUG(D_CACHE, "looking for null handle\n");
909 if (conn->cookie == -1) { /* this means assign a new connection */
910 CDEBUG(D_CACHE, "want a new connection\n");
914 CDEBUG(D_INFO, "looking for export cookie %#llx\n", conn->cookie);
915 export = class_handle2object(conn->cookie, export_handle_owner);
918 EXPORT_SYMBOL(class_conn2export);
920 struct obd_device *class_exp2obd(struct obd_export *exp)
926 EXPORT_SYMBOL(class_exp2obd);
928 struct obd_import *class_exp2cliimp(struct obd_export *exp)
930 struct obd_device *obd = exp->exp_obd;
933 return obd->u.cli.cl_import;
935 EXPORT_SYMBOL(class_exp2cliimp);
937 /* Export management functions */
938 static void class_export_destroy(struct obd_export *exp)
940 struct obd_device *obd = exp->exp_obd;
943 LASSERT(refcount_read(&exp->exp_handle.h_ref) == 0);
944 LASSERT(obd != NULL);
946 CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
947 exp->exp_client_uuid.uuid, obd->obd_name);
949 /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
950 if (exp->exp_connection)
951 ptlrpc_put_connection_superhack(exp->exp_connection);
953 LASSERT(list_empty(&exp->exp_outstanding_replies));
954 LASSERT(list_empty(&exp->exp_uncommitted_replies));
955 LASSERT(list_empty(&exp->exp_req_replay_queue));
956 LASSERT(list_empty(&exp->exp_hp_rpcs));
957 obd_destroy_export(exp);
958 /* self export doesn't hold a reference to an obd, although it
959 * exists until freeing of the obd */
960 if (exp != obd->obd_self_export)
961 class_decref(obd, "export", exp);
963 OBD_FREE_PRE(exp, sizeof(*exp), "rcu");
964 kfree_rcu(exp, exp_handle.h_rcu);
968 struct obd_export *class_export_get(struct obd_export *exp)
970 refcount_inc(&exp->exp_handle.h_ref);
971 CDEBUG(D_INFO, "GET export %p refcount=%d\n", exp,
972 refcount_read(&exp->exp_handle.h_ref));
975 EXPORT_SYMBOL(class_export_get);
977 void class_export_put(struct obd_export *exp)
979 LASSERT(exp != NULL);
980 LASSERT(refcount_read(&exp->exp_handle.h_ref) > 0);
981 LASSERT(refcount_read(&exp->exp_handle.h_ref) < LI_POISON);
982 CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
983 refcount_read(&exp->exp_handle.h_ref) - 1);
985 if (refcount_dec_and_test(&exp->exp_handle.h_ref)) {
986 struct obd_device *obd = exp->exp_obd;
988 CDEBUG(D_IOCTL, "final put %p/%s\n",
989 exp, exp->exp_client_uuid.uuid);
991 /* release nid stat refererence */
992 lprocfs_exp_cleanup(exp);
994 if (exp == obd->obd_self_export) {
995 /* self export should be destroyed without
996 * zombie thread as it doesn't hold a
997 * reference to obd and doesn't hold any
999 class_export_destroy(exp);
1000 /* self export is destroyed, no class
1001 * references exist and it is safe to free
1003 class_free_dev(obd);
1005 LASSERT(!list_empty(&exp->exp_obd_chain));
1006 obd_zombie_export_add(exp);
1011 EXPORT_SYMBOL(class_export_put);
1013 static void obd_zombie_exp_cull(struct work_struct *ws)
1015 struct obd_export *export;
1017 export = container_of(ws, struct obd_export, exp_zombie_work);
1018 class_export_destroy(export);
1021 /* Creates a new export, adds it to the hash table, and returns a
1022 * pointer to it. The refcount is 2: one for the hash reference, and
1023 * one for the pointer returned by this function. */
1024 struct obd_export *__class_new_export(struct obd_device *obd,
1025 struct obd_uuid *cluuid, bool is_self)
1027 struct obd_export *export;
1031 OBD_ALLOC_PTR(export);
1033 return ERR_PTR(-ENOMEM);
1035 export->exp_conn_cnt = 0;
1036 export->exp_lock_hash = NULL;
1037 export->exp_flock_hash = NULL;
1038 /* 2 = class_handle_hash + last */
1039 refcount_set(&export->exp_handle.h_ref, 2);
1040 atomic_set(&export->exp_rpc_count, 0);
1041 atomic_set(&export->exp_cb_count, 0);
1042 atomic_set(&export->exp_locks_count, 0);
1043 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1044 INIT_LIST_HEAD(&export->exp_locks_list);
1045 spin_lock_init(&export->exp_locks_list_guard);
1047 atomic_set(&export->exp_replay_count, 0);
1048 export->exp_obd = obd;
1049 INIT_LIST_HEAD(&export->exp_outstanding_replies);
1050 spin_lock_init(&export->exp_uncommitted_replies_lock);
1051 INIT_LIST_HEAD(&export->exp_uncommitted_replies);
1052 INIT_LIST_HEAD(&export->exp_req_replay_queue);
1053 INIT_HLIST_NODE(&export->exp_handle.h_link);
1054 INIT_LIST_HEAD(&export->exp_hp_rpcs);
1055 INIT_LIST_HEAD(&export->exp_reg_rpcs);
1056 class_handle_hash(&export->exp_handle, export_handle_owner);
1057 export->exp_last_request_time = ktime_get_real_seconds();
1058 spin_lock_init(&export->exp_lock);
1059 spin_lock_init(&export->exp_rpc_lock);
1060 INIT_HLIST_NODE(&export->exp_gen_hash);
1061 spin_lock_init(&export->exp_bl_list_lock);
1062 INIT_LIST_HEAD(&export->exp_bl_list);
1063 INIT_LIST_HEAD(&export->exp_stale_list);
1064 INIT_WORK(&export->exp_zombie_work, obd_zombie_exp_cull);
1066 export->exp_sp_peer = LUSTRE_SP_ANY;
1067 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
1068 export->exp_client_uuid = *cluuid;
1069 obd_init_export(export);
1071 at_init(&export->exp_bl_lock_at, obd_timeout, 0);
1073 spin_lock(&obd->obd_dev_lock);
1074 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
1075 /* shouldn't happen, but might race */
1076 if (obd->obd_stopping)
1077 GOTO(exit_unlock, rc = -ENODEV);
1079 rc = obd_uuid_add(obd, export);
1081 LCONSOLE_WARN("%s: denying duplicate export for %s: rc = %d\n",
1082 obd->obd_name, cluuid->uuid, rc);
1083 GOTO(exit_unlock, rc = -EALREADY);
1088 class_incref(obd, "export", export);
1089 list_add_tail(&export->exp_obd_chain_timed,
1090 &obd->obd_exports_timed);
1091 list_add(&export->exp_obd_chain, &obd->obd_exports);
1092 obd->obd_num_exports++;
1094 INIT_LIST_HEAD(&export->exp_obd_chain_timed);
1095 INIT_LIST_HEAD(&export->exp_obd_chain);
1097 spin_unlock(&obd->obd_dev_lock);
1101 spin_unlock(&obd->obd_dev_lock);
1102 class_handle_unhash(&export->exp_handle);
1103 obd_destroy_export(export);
1104 OBD_FREE_PTR(export);
1108 struct obd_export *class_new_export(struct obd_device *obd,
1109 struct obd_uuid *uuid)
1111 return __class_new_export(obd, uuid, false);
1113 EXPORT_SYMBOL(class_new_export);
1115 struct obd_export *class_new_export_self(struct obd_device *obd,
1116 struct obd_uuid *uuid)
1118 return __class_new_export(obd, uuid, true);
1121 void class_unlink_export(struct obd_export *exp)
1123 class_handle_unhash(&exp->exp_handle);
1125 if (exp->exp_obd->obd_self_export == exp) {
1126 class_export_put(exp);
1130 spin_lock(&exp->exp_obd->obd_dev_lock);
1131 /* delete an uuid-export hashitem from hashtables */
1132 if (exp != exp->exp_obd->obd_self_export)
1133 obd_uuid_del(exp->exp_obd, exp);
1135 #ifdef HAVE_SERVER_SUPPORT
1136 if (!hlist_unhashed(&exp->exp_gen_hash)) {
1137 struct tg_export_data *ted = &exp->exp_target_data;
1138 struct cfs_hash *hash;
1140 /* Because obd_gen_hash will not be released until
1141 * class_cleanup(), so hash should never be NULL here */
1142 hash = cfs_hash_getref(exp->exp_obd->obd_gen_hash);
1143 LASSERT(hash != NULL);
1144 cfs_hash_del(hash, &ted->ted_lcd->lcd_generation,
1145 &exp->exp_gen_hash);
1146 cfs_hash_putref(hash);
1148 #endif /* HAVE_SERVER_SUPPORT */
1150 list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
1151 list_del_init(&exp->exp_obd_chain_timed);
1152 exp->exp_obd->obd_num_exports--;
1153 spin_unlock(&exp->exp_obd->obd_dev_lock);
1154 atomic_inc(&obd_stale_export_num);
1156 /* A reference is kept by obd_stale_exports list */
1157 obd_stale_export_put(exp);
1159 EXPORT_SYMBOL(class_unlink_export);
1161 /* Import management functions */
1162 static void obd_zombie_import_free(struct obd_import *imp)
1166 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
1167 imp->imp_obd->obd_name);
1169 LASSERT(refcount_read(&imp->imp_refcount) == 0);
1171 ptlrpc_put_connection_superhack(imp->imp_connection);
1173 while (!list_empty(&imp->imp_conn_list)) {
1174 struct obd_import_conn *imp_conn;
1176 imp_conn = list_first_entry(&imp->imp_conn_list,
1177 struct obd_import_conn, oic_item);
1178 list_del_init(&imp_conn->oic_item);
1179 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
1180 OBD_FREE(imp_conn, sizeof(*imp_conn));
1183 LASSERT(imp->imp_sec == NULL);
1184 LASSERTF(atomic_read(&imp->imp_reqs) == 0, "%s: imp_reqs = %d\n",
1185 imp->imp_obd->obd_name, atomic_read(&imp->imp_reqs));
1186 class_decref(imp->imp_obd, "import", imp);
1191 struct obd_import *class_import_get(struct obd_import *import)
1193 refcount_inc(&import->imp_refcount);
1194 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
1195 refcount_read(&import->imp_refcount),
1196 import->imp_obd->obd_name);
1199 EXPORT_SYMBOL(class_import_get);
1201 void class_import_put(struct obd_import *imp)
1205 LASSERT(refcount_read(&imp->imp_refcount) > 0);
1207 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
1208 refcount_read(&imp->imp_refcount) - 1,
1209 imp->imp_obd->obd_name);
1211 if (refcount_dec_and_test(&imp->imp_refcount)) {
1212 CDEBUG(D_INFO, "final put import %p\n", imp);
1213 obd_zombie_import_add(imp);
1218 EXPORT_SYMBOL(class_import_put);
1220 static void init_imp_at(struct imp_at *at) {
1222 at_init(&at->iat_net_latency, 0, 0);
1223 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1224 /* max service estimates are tracked on the server side, so
1225 don't use the AT history here, just use the last reported
1226 val. (But keep hist for proc histogram, worst_ever) */
1227 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
1232 static void obd_zombie_imp_cull(struct work_struct *ws)
1234 struct obd_import *import;
1236 import = container_of(ws, struct obd_import, imp_zombie_work);
1237 obd_zombie_import_free(import);
1240 struct obd_import *class_new_import(struct obd_device *obd)
1242 struct obd_import *imp;
1243 struct pid_namespace *curr_pid_ns = ll_task_pid_ns(current);
1245 OBD_ALLOC(imp, sizeof(*imp));
1249 INIT_LIST_HEAD(&imp->imp_pinger_chain);
1250 INIT_LIST_HEAD(&imp->imp_replay_list);
1251 INIT_LIST_HEAD(&imp->imp_sending_list);
1252 INIT_LIST_HEAD(&imp->imp_delayed_list);
1253 INIT_LIST_HEAD(&imp->imp_committed_list);
1254 INIT_LIST_HEAD(&imp->imp_unreplied_list);
1255 imp->imp_known_replied_xid = 0;
1256 imp->imp_replay_cursor = &imp->imp_committed_list;
1257 spin_lock_init(&imp->imp_lock);
1258 imp->imp_last_success_conn = 0;
1259 imp->imp_state = LUSTRE_IMP_NEW;
1260 imp->imp_obd = class_incref(obd, "import", imp);
1261 rwlock_init(&imp->imp_sec_lock);
1262 init_waitqueue_head(&imp->imp_recovery_waitq);
1263 INIT_WORK(&imp->imp_zombie_work, obd_zombie_imp_cull);
1265 if (curr_pid_ns && curr_pid_ns->child_reaper)
1266 imp->imp_sec_refpid = curr_pid_ns->child_reaper->pid;
1268 imp->imp_sec_refpid = 1;
1270 refcount_set(&imp->imp_refcount, 2);
1271 atomic_set(&imp->imp_unregistering, 0);
1272 atomic_set(&imp->imp_reqs, 0);
1273 atomic_set(&imp->imp_inflight, 0);
1274 atomic_set(&imp->imp_replay_inflight, 0);
1275 atomic_set(&imp->imp_inval_count, 0);
1276 INIT_LIST_HEAD(&imp->imp_conn_list);
1277 init_imp_at(&imp->imp_at);
1279 /* the default magic is V2, will be used in connect RPC, and
1280 * then adjusted according to the flags in request/reply. */
1281 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
1285 EXPORT_SYMBOL(class_new_import);
1287 void class_destroy_import(struct obd_import *import)
1289 LASSERT(import != NULL);
1290 LASSERT(import != LP_POISON);
1292 spin_lock(&import->imp_lock);
1293 import->imp_generation++;
1294 spin_unlock(&import->imp_lock);
1295 class_import_put(import);
1297 EXPORT_SYMBOL(class_destroy_import);
1299 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1301 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1303 spin_lock(&exp->exp_locks_list_guard);
1305 LASSERT(lock->l_exp_refs_nr >= 0);
1307 if (lock->l_exp_refs_target != NULL &&
1308 lock->l_exp_refs_target != exp) {
1309 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1310 exp, lock, lock->l_exp_refs_target);
1312 if ((lock->l_exp_refs_nr ++) == 0) {
1313 list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1314 lock->l_exp_refs_target = exp;
1316 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1317 lock, exp, lock->l_exp_refs_nr);
1318 spin_unlock(&exp->exp_locks_list_guard);
1320 EXPORT_SYMBOL(__class_export_add_lock_ref);
1322 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1324 spin_lock(&exp->exp_locks_list_guard);
1325 LASSERT(lock->l_exp_refs_nr > 0);
1326 if (lock->l_exp_refs_target != exp) {
1327 LCONSOLE_WARN("lock %p, "
1328 "mismatching export pointers: %p, %p\n",
1329 lock, lock->l_exp_refs_target, exp);
1331 if (-- lock->l_exp_refs_nr == 0) {
1332 list_del_init(&lock->l_exp_refs_link);
1333 lock->l_exp_refs_target = NULL;
1335 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1336 lock, exp, lock->l_exp_refs_nr);
1337 spin_unlock(&exp->exp_locks_list_guard);
1339 EXPORT_SYMBOL(__class_export_del_lock_ref);
1342 /* A connection defines an export context in which preallocation can
1343 be managed. This releases the export pointer reference, and returns
1344 the export handle, so the export refcount is 1 when this function
1346 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1347 struct obd_uuid *cluuid)
1349 struct obd_export *export;
1350 LASSERT(conn != NULL);
1351 LASSERT(obd != NULL);
1352 LASSERT(cluuid != NULL);
1355 export = class_new_export(obd, cluuid);
1357 RETURN(PTR_ERR(export));
1359 conn->cookie = export->exp_handle.h_cookie;
1360 class_export_put(export);
1362 CDEBUG(D_IOCTL, "connect: client %s, cookie %#llx\n",
1363 cluuid->uuid, conn->cookie);
1366 EXPORT_SYMBOL(class_connect);
1368 /* if export is involved in recovery then clean up related things */
1369 static void class_export_recovery_cleanup(struct obd_export *exp)
1371 struct obd_device *obd = exp->exp_obd;
1373 spin_lock(&obd->obd_recovery_task_lock);
1374 if (obd->obd_recovering) {
1375 if (exp->exp_in_recovery) {
1376 spin_lock(&exp->exp_lock);
1377 exp->exp_in_recovery = 0;
1378 spin_unlock(&exp->exp_lock);
1379 LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
1380 atomic_dec(&obd->obd_connected_clients);
1383 /* if called during recovery then should update
1384 * obd_stale_clients counter,
1385 * lightweight exports are not counted */
1386 if ((exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
1387 exp->exp_obd->obd_stale_clients++;
1389 spin_unlock(&obd->obd_recovery_task_lock);
1391 spin_lock(&exp->exp_lock);
1392 /** Cleanup req replay fields */
1393 if (exp->exp_req_replay_needed) {
1394 exp->exp_req_replay_needed = 0;
1396 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1397 atomic_dec(&obd->obd_req_replay_clients);
1400 /** Cleanup lock replay data */
1401 if (exp->exp_lock_replay_needed) {
1402 exp->exp_lock_replay_needed = 0;
1404 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1405 atomic_dec(&obd->obd_lock_replay_clients);
1407 spin_unlock(&exp->exp_lock);
1410 /* This function removes 1-3 references from the export:
1411 * 1 - for export pointer passed
1412 * and if disconnect really need
1413 * 2 - removing from hash
1414 * 3 - in client_unlink_export
1415 * The export pointer passed to this function can destroyed */
1416 int class_disconnect(struct obd_export *export)
1418 int already_disconnected;
1421 if (export == NULL) {
1422 CWARN("attempting to free NULL export %p\n", export);
1426 spin_lock(&export->exp_lock);
1427 already_disconnected = export->exp_disconnected;
1428 export->exp_disconnected = 1;
1429 #ifdef HAVE_SERVER_SUPPORT
1430 /* We hold references of export for uuid hash
1431 * and nid_hash and export link at least. So
1432 * it is safe to call rh*table_remove_fast in
1435 obd_nid_del(export->exp_obd, export);
1436 #endif /* HAVE_SERVER_SUPPORT */
1437 spin_unlock(&export->exp_lock);
1439 /* class_cleanup(), abort_recovery(), and class_fail_export()
1440 * all end up in here, and if any of them race we shouldn't
1441 * call extra class_export_puts(). */
1442 if (already_disconnected)
1443 GOTO(no_disconn, already_disconnected);
1445 CDEBUG(D_IOCTL, "disconnect: cookie %#llx\n",
1446 export->exp_handle.h_cookie);
1448 class_export_recovery_cleanup(export);
1449 class_unlink_export(export);
1451 class_export_put(export);
1454 EXPORT_SYMBOL(class_disconnect);
1456 /* Return non-zero for a fully connected export */
1457 int class_connected_export(struct obd_export *exp)
1462 spin_lock(&exp->exp_lock);
1463 connected = (exp->exp_conn_cnt > 0) && !exp->exp_failed;
1464 spin_unlock(&exp->exp_lock);
1468 EXPORT_SYMBOL(class_connected_export);
1470 static void class_disconnect_export_list(struct list_head *list,
1471 enum obd_option flags)
1474 struct obd_export *exp;
1477 /* It's possible that an export may disconnect itself, but
1478 * nothing else will be added to this list. */
1479 while (!list_empty(list)) {
1480 exp = list_first_entry(list, struct obd_export,
1482 /* need for safe call CDEBUG after obd_disconnect */
1483 class_export_get(exp);
1485 spin_lock(&exp->exp_lock);
1486 exp->exp_flags = flags;
1487 spin_unlock(&exp->exp_lock);
1489 if (obd_uuid_equals(&exp->exp_client_uuid,
1490 &exp->exp_obd->obd_uuid)) {
1492 "exp %p export uuid == obd uuid, don't discon\n",
1494 /* Need to delete this now so we don't end up pointing
1495 * to work_list later when this export is cleaned up. */
1496 list_del_init(&exp->exp_obd_chain);
1497 class_export_put(exp);
1501 class_export_get(exp);
1502 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1503 "last request at %lld\n",
1504 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1505 exp, exp->exp_last_request_time);
1506 /* release one export reference anyway */
1507 rc = obd_disconnect(exp);
1509 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1510 obd_export_nid2str(exp), exp, rc);
1511 class_export_put(exp);
1516 void class_disconnect_exports(struct obd_device *obd)
1518 LIST_HEAD(work_list);
1521 /* Move all of the exports from obd_exports to a work list, en masse. */
1522 spin_lock(&obd->obd_dev_lock);
1523 list_splice_init(&obd->obd_exports, &work_list);
1524 list_splice_init(&obd->obd_delayed_exports, &work_list);
1525 spin_unlock(&obd->obd_dev_lock);
1527 if (!list_empty(&work_list)) {
1528 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1529 "disconnecting them\n", obd->obd_minor, obd);
1530 class_disconnect_export_list(&work_list,
1531 exp_flags_from_obd(obd));
1533 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1534 obd->obd_minor, obd);
1537 EXPORT_SYMBOL(class_disconnect_exports);
1539 /* Remove exports that have not completed recovery.
1541 void class_disconnect_stale_exports(struct obd_device *obd,
1542 int (*test_export)(struct obd_export *))
1544 LIST_HEAD(work_list);
1545 struct obd_export *exp, *n;
1549 spin_lock(&obd->obd_dev_lock);
1550 list_for_each_entry_safe(exp, n, &obd->obd_exports,
1552 /* don't count self-export as client */
1553 if (obd_uuid_equals(&exp->exp_client_uuid,
1554 &exp->exp_obd->obd_uuid))
1557 /* don't evict clients which have no slot in last_rcvd
1558 * (e.g. lightweight connection) */
1559 if (exp->exp_target_data.ted_lr_idx == -1)
1562 spin_lock(&exp->exp_lock);
1563 if (exp->exp_failed || test_export(exp)) {
1564 spin_unlock(&exp->exp_lock);
1567 exp->exp_failed = 1;
1568 spin_unlock(&exp->exp_lock);
1570 list_move(&exp->exp_obd_chain, &work_list);
1572 CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
1573 obd->obd_name, exp->exp_client_uuid.uuid,
1574 obd_export_nid2str(exp));
1575 print_export_data(exp, "EVICTING", 0, D_HA);
1577 spin_unlock(&obd->obd_dev_lock);
1580 LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
1581 obd->obd_name, evicted);
1583 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1584 OBD_OPT_ABORT_RECOV);
1587 EXPORT_SYMBOL(class_disconnect_stale_exports);
1589 void class_fail_export(struct obd_export *exp)
1591 int rc, already_failed;
1593 spin_lock(&exp->exp_lock);
1594 already_failed = exp->exp_failed;
1595 exp->exp_failed = 1;
1596 spin_unlock(&exp->exp_lock);
1598 if (already_failed) {
1599 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1600 exp, exp->exp_client_uuid.uuid);
1604 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1605 exp, exp->exp_client_uuid.uuid);
1607 if (obd_dump_on_timeout)
1608 libcfs_debug_dumplog();
1610 /* need for safe call CDEBUG after obd_disconnect */
1611 class_export_get(exp);
1613 /* Most callers into obd_disconnect are removing their own reference
1614 * (request, for example) in addition to the one from the hash table.
1615 * We don't have such a reference here, so make one. */
1616 class_export_get(exp);
1617 rc = obd_disconnect(exp);
1619 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1621 CDEBUG(D_HA, "disconnected export %p/%s\n",
1622 exp, exp->exp_client_uuid.uuid);
1623 class_export_put(exp);
1625 EXPORT_SYMBOL(class_fail_export);
1627 #ifdef HAVE_SERVER_SUPPORT
1628 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1630 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1631 struct obd_export *doomed_exp;
1632 struct rhashtable_iter iter;
1633 int exports_evicted = 0;
1635 spin_lock(&obd->obd_dev_lock);
1636 /* umount has run already, so evict thread should leave
1637 * its task to umount thread now */
1638 if (obd->obd_stopping) {
1639 spin_unlock(&obd->obd_dev_lock);
1640 return exports_evicted;
1642 spin_unlock(&obd->obd_dev_lock);
1644 rhltable_walk_enter(&obd->obd_nid_hash, &iter);
1645 rhashtable_walk_start(&iter);
1646 while ((doomed_exp = rhashtable_walk_next(&iter)) != NULL) {
1647 if (IS_ERR(doomed_exp))
1650 if (!doomed_exp->exp_connection ||
1651 doomed_exp->exp_connection->c_peer.nid != nid_key)
1654 if (!refcount_inc_not_zero(&doomed_exp->exp_handle.h_ref))
1657 rhashtable_walk_stop(&iter);
1659 LASSERTF(doomed_exp != obd->obd_self_export,
1660 "self-export is hashed by NID?\n");
1662 LCONSOLE_WARN("%s: evicting %s (at %s) by administrative request\n",
1664 obd_uuid2str(&doomed_exp->exp_client_uuid),
1665 obd_export_nid2str(doomed_exp));
1667 class_fail_export(doomed_exp);
1668 class_export_put(doomed_exp);
1671 rhashtable_walk_start(&iter);
1673 rhashtable_walk_stop(&iter);
1674 rhashtable_walk_exit(&iter);
1676 if (!exports_evicted)
1677 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1678 obd->obd_name, nid);
1679 return exports_evicted;
1681 EXPORT_SYMBOL(obd_export_evict_by_nid);
1683 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1685 struct obd_export *doomed_exp = NULL;
1686 struct obd_uuid doomed_uuid;
1687 int exports_evicted = 0;
1689 spin_lock(&obd->obd_dev_lock);
1690 if (obd->obd_stopping) {
1691 spin_unlock(&obd->obd_dev_lock);
1692 return exports_evicted;
1694 spin_unlock(&obd->obd_dev_lock);
1696 obd_str2uuid(&doomed_uuid, uuid);
1697 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1698 CERROR("%s: can't evict myself\n", obd->obd_name);
1699 return exports_evicted;
1702 doomed_exp = obd_uuid_lookup(obd, &doomed_uuid);
1703 if (doomed_exp == NULL) {
1704 CERROR("%s: can't disconnect %s: no exports found\n",
1705 obd->obd_name, uuid);
1707 CWARN("%s: evicting %s at adminstrative request\n",
1708 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1709 class_fail_export(doomed_exp);
1710 class_export_put(doomed_exp);
1711 obd_uuid_del(obd, doomed_exp);
1715 return exports_evicted;
1717 #endif /* HAVE_SERVER_SUPPORT */
1719 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1720 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1721 EXPORT_SYMBOL(class_export_dump_hook);
1724 static void print_export_data(struct obd_export *exp, const char *status,
1725 int locks, int debug_level)
1727 struct ptlrpc_reply_state *rs;
1728 struct ptlrpc_reply_state *first_reply = NULL;
1731 spin_lock(&exp->exp_lock);
1732 list_for_each_entry(rs, &exp->exp_outstanding_replies,
1738 spin_unlock(&exp->exp_lock);
1740 CDEBUG(debug_level, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: "
1741 "%p %s %llu stale:%d\n",
1742 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1743 obd_export_nid2str(exp),
1744 refcount_read(&exp->exp_handle.h_ref),
1745 atomic_read(&exp->exp_rpc_count),
1746 atomic_read(&exp->exp_cb_count),
1747 atomic_read(&exp->exp_locks_count),
1748 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1749 nreplies, first_reply, nreplies > 3 ? "..." : "",
1750 exp->exp_last_committed, !list_empty(&exp->exp_stale_list));
1751 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1752 if (locks && class_export_dump_hook != NULL)
1753 class_export_dump_hook(exp);
1757 void dump_exports(struct obd_device *obd, int locks, int debug_level)
1759 struct obd_export *exp;
1761 spin_lock(&obd->obd_dev_lock);
1762 list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1763 print_export_data(exp, "ACTIVE", locks, debug_level);
1764 list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1765 print_export_data(exp, "UNLINKED", locks, debug_level);
1766 list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1767 print_export_data(exp, "DELAYED", locks, debug_level);
1768 spin_unlock(&obd->obd_dev_lock);
1771 void obd_exports_barrier(struct obd_device *obd)
1774 LASSERT(list_empty(&obd->obd_exports));
1775 spin_lock(&obd->obd_dev_lock);
1776 while (!list_empty(&obd->obd_unlinked_exports)) {
1777 spin_unlock(&obd->obd_dev_lock);
1778 schedule_timeout_uninterruptible(cfs_time_seconds(waited));
1779 if (waited > 5 && is_power_of_2(waited)) {
1780 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1781 "more than %d seconds. "
1782 "The obd refcount = %d. Is it stuck?\n",
1783 obd->obd_name, waited,
1784 atomic_read(&obd->obd_refcount));
1785 dump_exports(obd, 1, D_CONSOLE | D_WARNING);
1788 spin_lock(&obd->obd_dev_lock);
1790 spin_unlock(&obd->obd_dev_lock);
1792 EXPORT_SYMBOL(obd_exports_barrier);
1795 * Add export to the obd_zombe thread and notify it.
1797 static void obd_zombie_export_add(struct obd_export *exp) {
1798 atomic_dec(&obd_stale_export_num);
1799 spin_lock(&exp->exp_obd->obd_dev_lock);
1800 LASSERT(!list_empty(&exp->exp_obd_chain));
1801 list_del_init(&exp->exp_obd_chain);
1802 spin_unlock(&exp->exp_obd->obd_dev_lock);
1804 queue_work(zombie_wq, &exp->exp_zombie_work);
1808 * Add import to the obd_zombe thread and notify it.
1810 static void obd_zombie_import_add(struct obd_import *imp) {
1811 LASSERT(imp->imp_sec == NULL);
1813 queue_work(zombie_wq, &imp->imp_zombie_work);
1817 * wait when obd_zombie import/export queues become empty
1819 void obd_zombie_barrier(void)
1821 flush_workqueue(zombie_wq);
1823 EXPORT_SYMBOL(obd_zombie_barrier);
1826 struct obd_export *obd_stale_export_get(void)
1828 struct obd_export *exp = NULL;
1831 spin_lock(&obd_stale_export_lock);
1832 if (!list_empty(&obd_stale_exports)) {
1833 exp = list_first_entry(&obd_stale_exports,
1834 struct obd_export, exp_stale_list);
1835 list_del_init(&exp->exp_stale_list);
1837 spin_unlock(&obd_stale_export_lock);
1840 CDEBUG(D_DLMTRACE, "Get export %p: total %d\n", exp,
1841 atomic_read(&obd_stale_export_num));
1845 EXPORT_SYMBOL(obd_stale_export_get);
1847 void obd_stale_export_put(struct obd_export *exp)
1851 LASSERT(list_empty(&exp->exp_stale_list));
1852 if (exp->exp_lock_hash &&
1853 atomic_read(&exp->exp_lock_hash->hs_count)) {
1854 CDEBUG(D_DLMTRACE, "Put export %p: total %d\n", exp,
1855 atomic_read(&obd_stale_export_num));
1857 spin_lock_bh(&exp->exp_bl_list_lock);
1858 spin_lock(&obd_stale_export_lock);
1859 /* Add to the tail if there is no blocked locks,
1860 * to the head otherwise. */
1861 if (list_empty(&exp->exp_bl_list))
1862 list_add_tail(&exp->exp_stale_list,
1863 &obd_stale_exports);
1865 list_add(&exp->exp_stale_list,
1866 &obd_stale_exports);
1868 spin_unlock(&obd_stale_export_lock);
1869 spin_unlock_bh(&exp->exp_bl_list_lock);
1871 class_export_put(exp);
1875 EXPORT_SYMBOL(obd_stale_export_put);
1878 * Adjust the position of the export in the stale list,
1879 * i.e. move to the head of the list if is needed.
1881 void obd_stale_export_adjust(struct obd_export *exp)
1883 LASSERT(exp != NULL);
1884 spin_lock_bh(&exp->exp_bl_list_lock);
1885 spin_lock(&obd_stale_export_lock);
1887 if (!list_empty(&exp->exp_stale_list) &&
1888 !list_empty(&exp->exp_bl_list))
1889 list_move(&exp->exp_stale_list, &obd_stale_exports);
1891 spin_unlock(&obd_stale_export_lock);
1892 spin_unlock_bh(&exp->exp_bl_list_lock);
1894 EXPORT_SYMBOL(obd_stale_export_adjust);
1897 * start destroy zombie import/export thread
1899 int obd_zombie_impexp_init(void)
1901 zombie_wq = cfs_cpt_bind_workqueue("obd_zombid", cfs_cpt_tab,
1903 cfs_cpt_number(cfs_cpt_tab));
1905 return IS_ERR(zombie_wq) ? PTR_ERR(zombie_wq) : 0;
1909 * stop destroy zombie import/export thread
1911 void obd_zombie_impexp_stop(void)
1913 destroy_workqueue(zombie_wq);
1914 LASSERT(list_empty(&obd_stale_exports));
1917 /***** Kernel-userspace comm helpers *******/
1919 /* Get length of entire message, including header */
1920 int kuc_len(int payload_len)
1922 return sizeof(struct kuc_hdr) + payload_len;
1924 EXPORT_SYMBOL(kuc_len);
1926 /* Get a pointer to kuc header, given a ptr to the payload
1927 * @param p Pointer to payload area
1928 * @returns Pointer to kuc header
1930 struct kuc_hdr * kuc_ptr(void *p)
1932 struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
1933 LASSERT(lh->kuc_magic == KUC_MAGIC);
1936 EXPORT_SYMBOL(kuc_ptr);
1938 /* Alloc space for a message, and fill in header
1939 * @return Pointer to payload area
1941 void *kuc_alloc(int payload_len, int transport, int type)
1944 int len = kuc_len(payload_len);
1948 return ERR_PTR(-ENOMEM);
1950 lh->kuc_magic = KUC_MAGIC;
1951 lh->kuc_transport = transport;
1952 lh->kuc_msgtype = type;
1953 lh->kuc_msglen = len;
1955 return (void *)(lh + 1);
1957 EXPORT_SYMBOL(kuc_alloc);
1959 /* Takes pointer to payload area */
1960 void kuc_free(void *p, int payload_len)
1962 struct kuc_hdr *lh = kuc_ptr(p);
1963 OBD_FREE(lh, kuc_len(payload_len));
1965 EXPORT_SYMBOL(kuc_free);
1967 struct obd_request_slot_waiter {
1968 struct list_head orsw_entry;
1969 wait_queue_head_t orsw_waitq;
1973 static bool obd_request_slot_avail(struct client_obd *cli,
1974 struct obd_request_slot_waiter *orsw)
1978 spin_lock(&cli->cl_loi_list_lock);
1979 avail = !!list_empty(&orsw->orsw_entry);
1980 spin_unlock(&cli->cl_loi_list_lock);
1986 * For network flow control, the RPC sponsor needs to acquire a credit
1987 * before sending the RPC. The credits count for a connection is defined
1988 * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
1989 * the subsequent RPC sponsors need to wait until others released their
1990 * credits, or the administrator increased the "cl_max_rpcs_in_flight".
1992 int obd_get_request_slot(struct client_obd *cli)
1994 struct obd_request_slot_waiter orsw;
1997 spin_lock(&cli->cl_loi_list_lock);
1998 if (cli->cl_rpcs_in_flight < cli->cl_max_rpcs_in_flight) {
1999 cli->cl_rpcs_in_flight++;
2000 spin_unlock(&cli->cl_loi_list_lock);
2004 init_waitqueue_head(&orsw.orsw_waitq);
2005 list_add_tail(&orsw.orsw_entry, &cli->cl_flight_waiters);
2006 orsw.orsw_signaled = false;
2007 spin_unlock(&cli->cl_loi_list_lock);
2009 rc = l_wait_event_abortable(orsw.orsw_waitq,
2010 obd_request_slot_avail(cli, &orsw) ||
2011 orsw.orsw_signaled);
2013 /* Here, we must take the lock to avoid the on-stack 'orsw' to be
2014 * freed but other (such as obd_put_request_slot) is using it. */
2015 spin_lock(&cli->cl_loi_list_lock);
2017 if (!orsw.orsw_signaled) {
2018 if (list_empty(&orsw.orsw_entry))
2019 cli->cl_rpcs_in_flight--;
2021 list_del(&orsw.orsw_entry);
2026 if (orsw.orsw_signaled) {
2027 LASSERT(list_empty(&orsw.orsw_entry));
2031 spin_unlock(&cli->cl_loi_list_lock);
2035 EXPORT_SYMBOL(obd_get_request_slot);
2037 void obd_put_request_slot(struct client_obd *cli)
2039 struct obd_request_slot_waiter *orsw;
2041 spin_lock(&cli->cl_loi_list_lock);
2042 cli->cl_rpcs_in_flight--;
2044 /* If there is free slot, wakeup the first waiter. */
2045 if (!list_empty(&cli->cl_flight_waiters) &&
2046 likely(cli->cl_rpcs_in_flight < cli->cl_max_rpcs_in_flight)) {
2047 orsw = list_first_entry(&cli->cl_flight_waiters,
2048 struct obd_request_slot_waiter,
2050 list_del_init(&orsw->orsw_entry);
2051 cli->cl_rpcs_in_flight++;
2052 wake_up(&orsw->orsw_waitq);
2054 spin_unlock(&cli->cl_loi_list_lock);
2056 EXPORT_SYMBOL(obd_put_request_slot);
2058 __u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
2060 return cli->cl_max_rpcs_in_flight;
2062 EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
2064 int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
2066 struct obd_request_slot_waiter *orsw;
2072 if (max > OBD_MAX_RIF_MAX || max < 1)
2075 CDEBUG(D_INFO, "%s: max = %hu max_mod = %u rif = %u\n",
2076 cli->cl_import->imp_obd->obd_name, max,
2077 cli->cl_max_mod_rpcs_in_flight, cli->cl_max_rpcs_in_flight);
2079 if (strcmp(cli->cl_import->imp_obd->obd_type->typ_name,
2080 LUSTRE_MDC_NAME) == 0) {
2081 /* adjust max_mod_rpcs_in_flight to ensure it is always
2082 * strictly lower that max_rpcs_in_flight */
2084 CERROR("%s: cannot set mdc.*.max_rpcs_in_flight=1\n",
2085 cli->cl_import->imp_obd->obd_name);
2088 if (max <= cli->cl_max_mod_rpcs_in_flight) {
2089 rc = obd_set_max_mod_rpcs_in_flight(cli, max - 1);
2095 spin_lock(&cli->cl_loi_list_lock);
2096 old = cli->cl_max_rpcs_in_flight;
2097 cli->cl_max_rpcs_in_flight = max;
2098 client_adjust_max_dirty(cli);
2102 /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
2103 for (i = 0; i < diff; i++) {
2104 if (list_empty(&cli->cl_flight_waiters))
2107 orsw = list_first_entry(&cli->cl_flight_waiters,
2108 struct obd_request_slot_waiter,
2110 list_del_init(&orsw->orsw_entry);
2111 cli->cl_rpcs_in_flight++;
2112 wake_up(&orsw->orsw_waitq);
2114 spin_unlock(&cli->cl_loi_list_lock);
2118 EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
2120 __u16 obd_get_max_mod_rpcs_in_flight(struct client_obd *cli)
2122 return cli->cl_max_mod_rpcs_in_flight;
2124 EXPORT_SYMBOL(obd_get_max_mod_rpcs_in_flight);
2126 int obd_set_max_mod_rpcs_in_flight(struct client_obd *cli, __u16 max)
2128 struct obd_connect_data *ocd;
2132 if (max > OBD_MAX_RIF_MAX || max < 1)
2135 ocd = &cli->cl_import->imp_connect_data;
2136 CDEBUG(D_INFO, "%s: max = %hu flags = %llx, max_mod = %u rif = %u\n",
2137 cli->cl_import->imp_obd->obd_name, max, ocd->ocd_connect_flags,
2138 ocd->ocd_maxmodrpcs, cli->cl_max_rpcs_in_flight);
2140 if (max == OBD_MAX_RIF_MAX)
2141 max = OBD_MAX_RIF_MAX - 1;
2143 /* Cannot exceed or equal max_rpcs_in_flight. If we are asked to
2144 * increase this value, also bump up max_rpcs_in_flight to match.
2146 if (max >= cli->cl_max_rpcs_in_flight) {
2148 "%s: increasing max_rpcs_in_flight=%hu to allow larger max_mod_rpcs_in_flight=%u\n",
2149 cli->cl_import->imp_obd->obd_name, max + 1, max);
2150 obd_set_max_rpcs_in_flight(cli, max + 1);
2153 /* cannot exceed max modify RPCs in flight supported by the server,
2154 * but verify ocd_connect_flags is at least initialized first. If
2155 * not, allow it and fix value later in ptlrpc_connect_set_flags().
2157 if (!ocd->ocd_connect_flags) {
2158 maxmodrpcs = cli->cl_max_rpcs_in_flight - 1;
2159 } else if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
2160 maxmodrpcs = ocd->ocd_maxmodrpcs;
2161 if (maxmodrpcs == 0) { /* connection not finished yet */
2162 maxmodrpcs = cli->cl_max_rpcs_in_flight - 1;
2164 "%s: partial connect, assume maxmodrpcs=%hu\n",
2165 cli->cl_import->imp_obd->obd_name, maxmodrpcs);
2170 if (max > maxmodrpcs) {
2171 CERROR("%s: can't set max_mod_rpcs_in_flight=%hu higher than ocd_maxmodrpcs=%hu returned by the server at connection\n",
2172 cli->cl_import->imp_obd->obd_name,
2177 spin_lock(&cli->cl_mod_rpcs_lock);
2179 prev = cli->cl_max_mod_rpcs_in_flight;
2180 cli->cl_max_mod_rpcs_in_flight = max;
2182 /* wakeup waiters if limit has been increased */
2183 if (cli->cl_max_mod_rpcs_in_flight > prev)
2184 wake_up(&cli->cl_mod_rpcs_waitq);
2186 spin_unlock(&cli->cl_mod_rpcs_lock);
2190 EXPORT_SYMBOL(obd_set_max_mod_rpcs_in_flight);
2192 int obd_mod_rpc_stats_seq_show(struct client_obd *cli,
2193 struct seq_file *seq)
2195 unsigned long mod_tot = 0, mod_cum;
2196 struct timespec64 now;
2199 ktime_get_real_ts64(&now);
2201 spin_lock(&cli->cl_mod_rpcs_lock);
2203 seq_printf(seq, "snapshot_time: %llu.%9lu (secs.nsecs)\n",
2204 (s64)now.tv_sec, now.tv_nsec);
2205 seq_printf(seq, "modify_RPCs_in_flight: %hu\n",
2206 cli->cl_mod_rpcs_in_flight);
2208 seq_printf(seq, "\n\t\t\tmodify\n");
2209 seq_printf(seq, "rpcs in flight rpcs %% cum %%\n");
2211 mod_tot = lprocfs_oh_sum(&cli->cl_mod_rpcs_hist);
2214 for (i = 0; i < OBD_HIST_MAX; i++) {
2215 unsigned long mod = cli->cl_mod_rpcs_hist.oh_buckets[i];
2217 seq_printf(seq, "%d:\t\t%10lu %3u %3u\n",
2218 i, mod, pct(mod, mod_tot),
2219 pct(mod_cum, mod_tot));
2220 if (mod_cum == mod_tot)
2224 spin_unlock(&cli->cl_mod_rpcs_lock);
2228 EXPORT_SYMBOL(obd_mod_rpc_stats_seq_show);
2230 /* The number of modify RPCs sent in parallel is limited
2231 * because the server has a finite number of slots per client to
2232 * store request result and ensure reply reconstruction when needed.
2233 * On the client, this limit is stored in cl_max_mod_rpcs_in_flight
2234 * that takes into account server limit and cl_max_rpcs_in_flight
2236 * On the MDC client, to avoid a potential deadlock (see Bugzilla 3462),
2237 * one close request is allowed above the maximum.
2239 static inline bool obd_mod_rpc_slot_avail_locked(struct client_obd *cli,
2244 /* A slot is available if
2245 * - number of modify RPCs in flight is less than the max
2246 * - it's a close RPC and no other close request is in flight
2248 avail = cli->cl_mod_rpcs_in_flight < cli->cl_max_mod_rpcs_in_flight ||
2249 (close_req && cli->cl_close_rpcs_in_flight == 0);
2254 static inline bool obd_mod_rpc_slot_avail(struct client_obd *cli,
2259 spin_lock(&cli->cl_mod_rpcs_lock);
2260 avail = obd_mod_rpc_slot_avail_locked(cli, close_req);
2261 spin_unlock(&cli->cl_mod_rpcs_lock);
2266 /* Get a modify RPC slot from the obd client @cli according
2267 * to the kind of operation @opc that is going to be sent
2268 * and the intent @it of the operation if it applies.
2269 * If the maximum number of modify RPCs in flight is reached
2270 * the thread is put to sleep.
2271 * Returns the tag to be set in the request message. Tag 0
2272 * is reserved for non-modifying requests.
2274 __u16 obd_get_mod_rpc_slot(struct client_obd *cli, __u32 opc)
2276 bool close_req = false;
2279 if (opc == MDS_CLOSE)
2283 spin_lock(&cli->cl_mod_rpcs_lock);
2284 max = cli->cl_max_mod_rpcs_in_flight;
2285 if (obd_mod_rpc_slot_avail_locked(cli, close_req)) {
2286 /* there is a slot available */
2287 cli->cl_mod_rpcs_in_flight++;
2289 cli->cl_close_rpcs_in_flight++;
2290 lprocfs_oh_tally(&cli->cl_mod_rpcs_hist,
2291 cli->cl_mod_rpcs_in_flight);
2292 /* find a free tag */
2293 i = find_first_zero_bit(cli->cl_mod_tag_bitmap,
2295 LASSERT(i < OBD_MAX_RIF_MAX);
2296 LASSERT(!test_and_set_bit(i, cli->cl_mod_tag_bitmap));
2297 spin_unlock(&cli->cl_mod_rpcs_lock);
2298 /* tag 0 is reserved for non-modify RPCs */
2301 "%s: modify RPC slot %u is allocated opc %u, max %hu\n",
2302 cli->cl_import->imp_obd->obd_name,
2307 spin_unlock(&cli->cl_mod_rpcs_lock);
2309 CDEBUG(D_RPCTRACE, "%s: sleeping for a modify RPC slot "
2310 "opc %u, max %hu\n",
2311 cli->cl_import->imp_obd->obd_name, opc, max);
2313 wait_event_idle_exclusive(cli->cl_mod_rpcs_waitq,
2314 obd_mod_rpc_slot_avail(cli,
2318 EXPORT_SYMBOL(obd_get_mod_rpc_slot);
2320 /* Put a modify RPC slot from the obd client @cli according
2321 * to the kind of operation @opc that has been sent.
2323 void obd_put_mod_rpc_slot(struct client_obd *cli, __u32 opc, __u16 tag)
2325 bool close_req = false;
2330 if (opc == MDS_CLOSE)
2333 spin_lock(&cli->cl_mod_rpcs_lock);
2334 cli->cl_mod_rpcs_in_flight--;
2336 cli->cl_close_rpcs_in_flight--;
2337 /* release the tag in the bitmap */
2338 LASSERT(tag - 1 < OBD_MAX_RIF_MAX);
2339 LASSERT(test_and_clear_bit(tag - 1, cli->cl_mod_tag_bitmap) != 0);
2340 spin_unlock(&cli->cl_mod_rpcs_lock);
2341 wake_up(&cli->cl_mod_rpcs_waitq);
2343 EXPORT_SYMBOL(obd_put_mod_rpc_slot);