Return to lockspace.c CVS log

Up to [Development] / linux-2.6-xfs / fs / dlm

Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
**
**  This copyrighted material is made available to anyone wishing to use,
**  modify, copy, or redistribute it subject to the terms and conditions
**  of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/

#include "dlm_internal.h"
#include "lockspace.h"
#include "member.h"
#include "recoverd.h"
#include "ast.h"
#include "dir.h"
#include "lowcomms.h"
#include "config.h"
#include "memory.h"
#include "lock.h"
#include "recover.h"
#include "requestqueue.h"

#ifdef CONFIG_DLM_DEBUG
int dlm_create_debug_file(struct dlm_ls *ls);
void dlm_delete_debug_file(struct dlm_ls *ls);
#else
static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
#endif

static int			ls_count;
static struct mutex		ls_lock;
static struct list_head		lslist;
static spinlock_t		lslist_lock;
static struct task_struct *	scand_task;


static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len)
{
	ssize_t ret = len;
	int n = simple_strtol(buf, NULL, 0);

	ls = dlm_find_lockspace_local(ls->ls_local_handle);
	if (!ls)
		return -EINVAL;

	switch (n) {
	case 0:
		dlm_ls_stop(ls);
		break;
	case 1:
		dlm_ls_start(ls);
		break;
	default:
		ret = -EINVAL;
	}
	dlm_put_lockspace(ls);
	return ret;
}

static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len)
{
	ls->ls_uevent_result = simple_strtol(buf, NULL, 0);
	set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags);
	wake_up(&ls->ls_uevent_wait);
	return len;
}

static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id);
}

static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len)
{
	ls->ls_global_id = simple_strtoul(buf, NULL, 0);
	return len;
}

static ssize_t dlm_recover_status_show(struct dlm_ls *ls, char *buf)
{
	uint32_t status = dlm_recover_status(ls);
	return snprintf(buf, PAGE_SIZE, "%x\n", status);
}

static ssize_t dlm_recover_nodeid_show(struct dlm_ls *ls, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", ls->ls_recover_nodeid);
}

struct dlm_attr {
	struct attribute attr;
	ssize_t (*show)(struct dlm_ls *, char *);
	ssize_t (*store)(struct dlm_ls *, const char *, size_t);
};

static struct dlm_attr dlm_attr_control = {
	.attr  = {.name = "control", .mode = S_IWUSR},
	.store = dlm_control_store
};

static struct dlm_attr dlm_attr_event = {
	.attr  = {.name = "event_done", .mode = S_IWUSR},
	.store = dlm_event_store
};

static struct dlm_attr dlm_attr_id = {
	.attr  = {.name = "id", .mode = S_IRUGO | S_IWUSR},
	.show  = dlm_id_show,
	.store = dlm_id_store
};

static struct dlm_attr dlm_attr_recover_status = {
	.attr  = {.name = "recover_status", .mode = S_IRUGO},
	.show  = dlm_recover_status_show
};

static struct dlm_attr dlm_attr_recover_nodeid = {
	.attr  = {.name = "recover_nodeid", .mode = S_IRUGO},
	.show  = dlm_recover_nodeid_show
};

static struct attribute *dlm_attrs[] = {
	&dlm_attr_control.attr,
	&dlm_attr_event.attr,
	&dlm_attr_id.attr,
	&dlm_attr_recover_status.attr,
	&dlm_attr_recover_nodeid.attr,
	NULL,
};

static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr,
			     char *buf)
{
	struct dlm_ls *ls  = container_of(kobj, struct dlm_ls, ls_kobj);
	struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
	return a->show ? a->show(ls, buf) : 0;
}

static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr,
			      const char *buf, size_t len)
{
	struct dlm_ls *ls  = container_of(kobj, struct dlm_ls, ls_kobj);
	struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
	return a->store ? a->store(ls, buf, len) : len;
}

static void lockspace_kobj_release(struct kobject *k)
{
	struct dlm_ls *ls  = container_of(k, struct dlm_ls, ls_kobj);
	kfree(ls);
}

static struct sysfs_ops dlm_attr_ops = {
	.show  = dlm_attr_show,
	.store = dlm_attr_store,
};

static struct kobj_type dlm_ktype = {
	.default_attrs = dlm_attrs,
	.sysfs_ops     = &dlm_attr_ops,
	.release       = lockspace_kobj_release,
};

static struct kset dlm_kset = {
	.kobj   = {.name = "dlm",},
	.ktype  = &dlm_ktype,
};

static int kobject_setup(struct dlm_ls *ls)
{
	char lsname[DLM_LOCKSPACE_LEN];
	int error;

	memset(lsname, 0, DLM_LOCKSPACE_LEN);
	snprintf(lsname, DLM_LOCKSPACE_LEN, "%s", ls->ls_name);

	error = kobject_set_name(&ls->ls_kobj, "%s", lsname);
	if (error)
		return error;

	ls->ls_kobj.kset = &dlm_kset;
	ls->ls_kobj.ktype = &dlm_ktype;
	return 0;
}

static int do_uevent(struct dlm_ls *ls, int in)
{
	int error;

	if (in)
		kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE);
	else
		kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE);

	log_debug(ls, "%s the lockspace group...", in ? "joining" : "leaving");

	/* dlm_controld will see the uevent, do the necessary group management
	   and then write to sysfs to wake us */

	error = wait_event_interruptible(ls->ls_uevent_wait,
			test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags));

	log_debug(ls, "group event done %d %d", error, ls->ls_uevent_result);

	if (error)
		goto out;

	error = ls->ls_uevent_result;
 out:
	if (error)
		log_error(ls, "group %s failed %d %d", in ? "join" : "leave",
			  error, ls->ls_uevent_result);
	return error;
}


int dlm_lockspace_init(void)
{
	int error;

	ls_count = 0;
	mutex_init(&ls_lock);
	INIT_LIST_HEAD(&lslist);
	spin_lock_init(&lslist_lock);

	kobj_set_kset_s(&dlm_kset, kernel_subsys);
	error = kset_register(&dlm_kset);
	if (error)
		printk("dlm_lockspace_init: cannot register kset %d\n", error);
	return error;
}

void dlm_lockspace_exit(void)
{
	kset_unregister(&dlm_kset);
}

static int dlm_scand(void *data)
{
	struct dlm_ls *ls;

	while (!kthread_should_stop()) {
		list_for_each_entry(ls, &lslist, ls_list) {
			if (dlm_lock_recovery_try(ls)) {
				dlm_scan_rsbs(ls);
				dlm_scan_timeout(ls);
				dlm_unlock_recovery(ls);
			}
		}
		schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
	}
	return 0;
}

static int dlm_scand_start(void)
{
	struct task_struct *p;
	int error = 0;

	p = kthread_run(dlm_scand, NULL, "dlm_scand");
	if (IS_ERR(p))
		error = PTR_ERR(p);
	else
		scand_task = p;
	return error;
}

static void dlm_scand_stop(void)
{
	kthread_stop(scand_task);
}

static struct dlm_ls *dlm_find_lockspace_name(char *name, int namelen)
{
	struct dlm_ls *ls;

	spin_lock(&lslist_lock);

	list_for_each_entry(ls, &lslist, ls_list) {
		if (ls->ls_namelen == namelen &&
		    memcmp(ls->ls_name, name, namelen) == 0)
			goto out;
	}
	ls = NULL;
 out:
	spin_unlock(&lslist_lock);
	return ls;
}

struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
{
	struct dlm_ls *ls;

	spin_lock(&lslist_lock);

	list_for_each_entry(ls, &lslist, ls_list) {
		if (ls->ls_global_id == id) {
			ls->ls_count++;
			goto out;
		}
	}
	ls = NULL;
 out:
	spin_unlock(&lslist_lock);
	return ls;
}

struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace)
{
	struct dlm_ls *ls;

	spin_lock(&lslist_lock);
	list_for_each_entry(ls, &lslist, ls_list) {
		if (ls->ls_local_handle == lockspace) {
			ls->ls_count++;
			goto out;
		}
	}
	ls = NULL;
 out:
	spin_unlock(&lslist_lock);
	return ls;
}

struct dlm_ls *dlm_find_lockspace_device(int minor)
{
	struct dlm_ls *ls;

	spin_lock(&lslist_lock);
	list_for_each_entry(ls, &lslist, ls_list) {
		if (ls->ls_device.minor == minor) {
			ls->ls_count++;
			goto out;
		}
	}
	ls = NULL;
 out:
	spin_unlock(&lslist_lock);
	return ls;
}

void dlm_put_lockspace(struct dlm_ls *ls)
{
	spin_lock(&lslist_lock);
	ls->ls_count--;
	spin_unlock(&lslist_lock);
}

static void remove_lockspace(struct dlm_ls *ls)
{
	for (;;) {
		spin_lock(&lslist_lock);
		if (ls->ls_count == 0) {
			list_del(&ls->ls_list);
			spin_unlock(&lslist_lock);
			return;
		}
		spin_unlock(&lslist_lock);
		ssleep(1);
	}
}

static int threads_start(void)
{
	int error;

	/* Thread which process lock requests for all lockspace's */
	error = dlm_astd_start();
	if (error) {
		log_print("cannot start dlm_astd thread %d", error);
		goto fail;
	}

	error = dlm_scand_start();
	if (error) {
		log_print("cannot start dlm_scand thread %d", error);
		goto astd_fail;
	}

	/* Thread for sending/receiving messages for all lockspace's */
	error = dlm_lowcomms_start();
	if (error) {
		log_print("cannot start dlm lowcomms %d", error);
		goto scand_fail;
	}

	return 0;

 scand_fail:
	dlm_scand_stop();
 astd_fail:
	dlm_astd_stop();
 fail:
	return error;
}

static void threads_stop(void)
{
	dlm_scand_stop();
	dlm_lowcomms_stop();
	dlm_astd_stop();
}

static int new_lockspace(char *name, int namelen, void **lockspace,
			 uint32_t flags, int lvblen)
{
	struct dlm_ls *ls;
	int i, size, error = -ENOMEM;
	int do_unreg = 0;

	if (namelen > DLM_LOCKSPACE_LEN)
		return -EINVAL;

	if (!lvblen || (lvblen % 8))
		return -EINVAL;

	if (!try_module_get(THIS_MODULE))
		return -EINVAL;

	ls = dlm_find_lockspace_name(name, namelen);
	if (ls) {
		*lockspace = ls;
		module_put(THIS_MODULE);
		return -EEXIST;
	}

	ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_KERNEL);
	if (!ls)
		goto out;
	memcpy(ls->ls_name, name, namelen);
	ls->ls_namelen = namelen;
	ls->ls_lvblen = lvblen;
	ls->ls_count = 0;
	ls->ls_flags = 0;

	if (flags & DLM_LSFL_TIMEWARN)
		set_bit(LSFL_TIMEWARN, &ls->ls_flags);

	if (flags & DLM_LSFL_FS)
		ls->ls_allocation = GFP_NOFS;
	else
		ls->ls_allocation = GFP_KERNEL;

	/* ls_exflags are forced to match among nodes, and we don't
	   need to require all nodes to have TIMEWARN or FS set */
	ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS));

	size = dlm_config.ci_rsbtbl_size;
	ls->ls_rsbtbl_size = size;

	ls->ls_rsbtbl = kmalloc(sizeof(struct dlm_rsbtable) * size, GFP_KERNEL);
	if (!ls->ls_rsbtbl)
		goto out_lsfree;
	for (i = 0; i < size; i++) {
		INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list);
		INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss);
		rwlock_init(&ls->ls_rsbtbl[i].lock);
	}

	size = dlm_config.ci_lkbtbl_size;
	ls->ls_lkbtbl_size = size;

	ls->ls_lkbtbl = kmalloc(sizeof(struct dlm_lkbtable) * size, GFP_KERNEL);
	if (!ls->ls_lkbtbl)
		goto out_rsbfree;
	for (i = 0; i < size; i++) {
		INIT_LIST_HEAD(&ls->ls_lkbtbl[i].list);
		rwlock_init(&ls->ls_lkbtbl[i].lock);
		ls->ls_lkbtbl[i].counter = 1;
	}

	size = dlm_config.ci_dirtbl_size;
	ls->ls_dirtbl_size = size;

	ls->ls_dirtbl = kmalloc(sizeof(struct dlm_dirtable) * size, GFP_KERNEL);
	if (!ls->ls_dirtbl)
		goto out_lkbfree;
	for (i = 0; i < size; i++) {
		INIT_LIST_HEAD(&ls->ls_dirtbl[i].list);
		rwlock_init(&ls->ls_dirtbl[i].lock);
	}

	INIT_LIST_HEAD(&ls->ls_waiters);
	mutex_init(&ls->ls_waiters_mutex);
	INIT_LIST_HEAD(&ls->ls_orphans);
	mutex_init(&ls->ls_orphans_mutex);
	INIT_LIST_HEAD(&ls->ls_timeout);
	mutex_init(&ls->ls_timeout_mutex);

	INIT_LIST_HEAD(&ls->ls_nodes);
	INIT_LIST_HEAD(&ls->ls_nodes_gone);
	ls->ls_num_nodes = 0;
	ls->ls_low_nodeid = 0;
	ls->ls_total_weight = 0;
	ls->ls_node_array = NULL;

	memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb));
	ls->ls_stub_rsb.res_ls = ls;

	ls->ls_debug_rsb_dentry = NULL;
	ls->ls_debug_waiters_dentry = NULL;

	init_waitqueue_head(&ls->ls_uevent_wait);
	ls->ls_uevent_result = 0;
	init_completion(&ls->ls_members_done);
	ls->ls_members_result = -1;

	ls->ls_recoverd_task = NULL;
	mutex_init(&ls->ls_recoverd_active);
	spin_lock_init(&ls->ls_recover_lock);
	spin_lock_init(&ls->ls_rcom_spin);
	get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t));
	ls->ls_recover_status = 0;
	ls->ls_recover_seq = 0;
	ls->ls_recover_args = NULL;
	init_rwsem(&ls->ls_in_recovery);
	INIT_LIST_HEAD(&ls->ls_requestqueue);
	mutex_init(&ls->ls_requestqueue_mutex);
	mutex_init(&ls->ls_clear_proc_locks);

	ls->ls_recover_buf = kmalloc(dlm_config.ci_buffer_size, GFP_KERNEL);
	if (!ls->ls_recover_buf)
		goto out_dirfree;

	INIT_LIST_HEAD(&ls->ls_recover_list);
	spin_lock_init(&ls->ls_recover_list_lock);
	ls->ls_recover_list_count = 0;
	ls->ls_local_handle = ls;
	init_waitqueue_head(&ls->ls_wait_general);
	INIT_LIST_HEAD(&ls->ls_root_list);
	init_rwsem(&ls->ls_root_sem);

	down_write(&ls->ls_in_recovery);

	spin_lock(&lslist_lock);
	list_add(&ls->ls_list, &lslist);
	spin_unlock(&lslist_lock);

	/* needs to find ls in lslist */
	error = dlm_recoverd_start(ls);
	if (error) {
		log_error(ls, "can't start dlm_recoverd %d", error);
		goto out_delist;
	}

	error = kobject_setup(ls);
	if (error)
		goto out_stop;

	error = kobject_register(&ls->ls_kobj);
	if (error)
		goto out_stop;

	/* let kobject handle freeing of ls if there's an error */
	do_unreg = 1;

	/* This uevent triggers dlm_controld in userspace to add us to the
	   group of nodes that are members of this lockspace (managed by the
	   cluster infrastructure.)  Once it's done that, it tells us who the
	   current lockspace members are (via configfs) and then tells the
	   lockspace to start running (via sysfs) in dlm_ls_start(). */

	error = do_uevent(ls, 1);
	if (error)
		goto out_stop;

	wait_for_completion(&ls->ls_members_done);
	error = ls->ls_members_result;
	if (error)
		goto out_members;

	dlm_create_debug_file(ls);

	log_debug(ls, "join complete");

	*lockspace = ls;
	return 0;

 out_members:
	do_uevent(ls, 0);
	dlm_clear_members(ls);
	kfree(ls->ls_node_array);
 out_stop:
	dlm_recoverd_stop(ls);
 out_delist:
	spin_lock(&lslist_lock);
	list_del(&ls->ls_list);
	spin_unlock(&lslist_lock);
	kfree(ls->ls_recover_buf);
 out_dirfree:
	kfree(ls->ls_dirtbl);
 out_lkbfree:
	kfree(ls->ls_lkbtbl);
 out_rsbfree:
	kfree(ls->ls_rsbtbl);
 out_lsfree:
	if (do_unreg)
		kobject_unregister(&ls->ls_kobj);
	else
		kfree(ls);
 out:
	module_put(THIS_MODULE);
	return error;
}

int dlm_new_lockspace(char *name, int namelen, void **lockspace,
		      uint32_t flags, int lvblen)
{
	int error = 0;

	mutex_lock(&ls_lock);
	if (!ls_count)
		error = threads_start();
	if (error)
		goto out;

	error = new_lockspace(name, namelen, lockspace, flags, lvblen);
	if (!error)
		ls_count++;
	else if (!ls_count)
		threads_stop();
 out:
	mutex_unlock(&ls_lock);
	return error;
}

/* Return 1 if the lockspace still has active remote locks,
 *        2 if the lockspace still has active local locks.
 */
static int lockspace_busy(struct dlm_ls *ls)
{
	int i, lkb_found = 0;
	struct dlm_lkb *lkb;

	/* NOTE: We check the lockidtbl here rather than the resource table.
	   This is because there may be LKBs queued as ASTs that have been
	   unlinked from their RSBs and are pending deletion once the AST has
	   been delivered */

	for (i = 0; i < ls->ls_lkbtbl_size; i++) {
		read_lock(&ls->ls_lkbtbl[i].lock);
		if (!list_empty(&ls->ls_lkbtbl[i].list)) {
			lkb_found = 1;
			list_for_each_entry(lkb, &ls->ls_lkbtbl[i].list,
					    lkb_idtbl_list) {
				if (!lkb->lkb_nodeid) {
					read_unlock(&ls->ls_lkbtbl[i].lock);
					return 2;
				}
			}
		}
		read_unlock(&ls->ls_lkbtbl[i].lock);
	}
	return lkb_found;
}

static int release_lockspace(struct dlm_ls *ls, int force)
{
	struct dlm_lkb *lkb;
	struct dlm_rsb *rsb;
	struct list_head *head;
	int i;
	int busy = lockspace_busy(ls);

	if (busy > force)
		return -EBUSY;

	if (force < 3)
		do_uevent(ls, 0);

	dlm_recoverd_stop(ls);

	remove_lockspace(ls);

	dlm_delete_debug_file(ls);

	dlm_astd_suspend();

	kfree(ls->ls_recover_buf);

	/*
	 * Free direntry structs.
	 */

	dlm_dir_clear(ls);
	kfree(ls->ls_dirtbl);

	/*
	 * Free all lkb's on lkbtbl[] lists.
	 */

	for (i = 0; i < ls->ls_lkbtbl_size; i++) {
		head = &ls->ls_lkbtbl[i].list;
		while (!list_empty(head)) {
			lkb = list_entry(head->next, struct dlm_lkb,
					 lkb_idtbl_list);

			list_del(&lkb->lkb_idtbl_list);

			dlm_del_ast(lkb);

			if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
				free_lvb(lkb->lkb_lvbptr);

			free_lkb(lkb);
		}
	}
	dlm_astd_resume();

	kfree(ls->ls_lkbtbl);

	/*
	 * Free all rsb's on rsbtbl[] lists
	 */

	for (i = 0; i < ls->ls_rsbtbl_size; i++) {
		head = &ls->ls_rsbtbl[i].list;
		while (!list_empty(head)) {
			rsb = list_entry(head->next, struct dlm_rsb,
					 res_hashchain);

			list_del(&rsb->res_hashchain);
			free_rsb(rsb);
		}

		head = &ls->ls_rsbtbl[i].toss;
		while (!list_empty(head)) {
			rsb = list_entry(head->next, struct dlm_rsb,
					 res_hashchain);
			list_del(&rsb->res_hashchain);
			free_rsb(rsb);
		}
	}

	kfree(ls->ls_rsbtbl);

	/*
	 * Free structures on any other lists
	 */

	dlm_purge_requestqueue(ls);
	kfree(ls->ls_recover_args);
	dlm_clear_free_entries(ls);
	dlm_clear_members(ls);
	dlm_clear_members_gone(ls);
	kfree(ls->ls_node_array);
	kobject_unregister(&ls->ls_kobj);
	/* The ls structure will be freed when the kobject is done with */

	mutex_lock(&ls_lock);
	ls_count--;
	if (!ls_count)
		threads_stop();
	mutex_unlock(&ls_lock);

	module_put(THIS_MODULE);
	return 0;
}

/*
 * Called when a system has released all its locks and is not going to use the
 * lockspace any longer.  We free everything we're managing for this lockspace.
 * Remaining nodes will go through the recovery process as if we'd died.  The
 * lockspace must continue to function as usual, participating in recoveries,
 * until this returns.
 *
 * Force has 4 possible values:
 * 0 - don't destroy locksapce if it has any LKBs
 * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs
 * 2 - destroy lockspace regardless of LKBs
 * 3 - destroy lockspace as part of a forced shutdown
 */

int dlm_release_lockspace(void *lockspace, int force)
{
	struct dlm_ls *ls;

	ls = dlm_find_lockspace_local(lockspace);
	if (!ls)
		return -EINVAL;
	dlm_put_lockspace(ls);
	return release_lockspace(ls, force);
}