“6f3ec9952c13f0adf632e89456df43946cec6525”上不存在“README.md”
lockspace.c 19.7 KB
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/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
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**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
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**
**  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 "dir.h"
#include "lowcomms.h"
#include "config.h"
#include "memory.h"
#include "lock.h"
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#include "recover.h"
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#include "requestqueue.h"
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#include "user.h"
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#include "ast.h"
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static int			ls_count;
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static struct mutex		ls_lock;
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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);

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

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	switch (n) {
	case 0:
		dlm_ls_stop(ls);
		break;
	case 1:
		dlm_ls_start(ls);
		break;
	default:
		ret = -EINVAL;
	}
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	dlm_put_lockspace(ls);
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	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)
{
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	return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id);
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}

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;
}

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static ssize_t dlm_nodir_show(struct dlm_ls *ls, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%u\n", dlm_no_directory(ls));
}

static ssize_t dlm_nodir_store(struct dlm_ls *ls, const char *buf, size_t len)
{
	int val = simple_strtoul(buf, NULL, 0);
	if (val == 1)
		set_bit(LSFL_NODIR, &ls->ls_flags);
	return len;
}

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

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

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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
};

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static struct dlm_attr dlm_attr_nodir = {
	.attr  = {.name = "nodir", .mode = S_IRUGO | S_IWUSR},
	.show  = dlm_nodir_show,
	.store = dlm_nodir_store
};

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

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

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

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

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

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

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static struct kset *dlm_kset;
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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);

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	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 */

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	error = wait_event_interruptible(ls->ls_uevent_wait,
			test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags));
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	log_debug(ls, "group event done %d %d", error, ls->ls_uevent_result);

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	if (error)
		goto out;

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

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static int dlm_uevent(struct kset *kset, struct kobject *kobj,
		      struct kobj_uevent_env *env)
{
	struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);

	add_uevent_var(env, "LOCKSPACE=%s", ls->ls_name);
	return 0;
}

static struct kset_uevent_ops dlm_uevent_ops = {
	.uevent = dlm_uevent,
};
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int __init dlm_lockspace_init(void)
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{
	ls_count = 0;
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	mutex_init(&ls_lock);
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	INIT_LIST_HEAD(&lslist);
	spin_lock_init(&lslist_lock);

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	dlm_kset = kset_create_and_add("dlm", &dlm_uevent_ops, kernel_kobj);
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	if (!dlm_kset) {
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		printk(KERN_WARNING "%s: can not create kset\n", __func__);
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		return -ENOMEM;
	}
	return 0;
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}

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

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static struct dlm_ls *find_ls_to_scan(void)
{
	struct dlm_ls *ls;

	spin_lock(&lslist_lock);
	list_for_each_entry(ls, &lslist, ls_list) {
		if (time_after_eq(jiffies, ls->ls_scan_time +
					    dlm_config.ci_scan_secs * HZ)) {
			spin_unlock(&lslist_lock);
			return ls;
		}
	}
	spin_unlock(&lslist_lock);
	return NULL;
}

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

	while (!kthread_should_stop()) {
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		ls = find_ls_to_scan();
		if (ls) {
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			if (dlm_lock_recovery_try(ls)) {
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				ls->ls_scan_time = jiffies;
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				dlm_scan_rsbs(ls);
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				dlm_scan_timeout(ls);
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				dlm_scan_waiters(ls);
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				dlm_unlock_recovery(ls);
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			} else {
				ls->ls_scan_time += HZ;
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			}
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			continue;
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		}
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		schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
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	}
	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);
}

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;
}

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struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace)
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{
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	struct dlm_ls *ls;
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	spin_lock(&lslist_lock);
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	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:
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	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) {
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			WARN_ON(ls->ls_create_count != 0);
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			list_del(&ls->ls_list);
			spin_unlock(&lslist_lock);
			return;
		}
		spin_unlock(&lslist_lock);
		ssleep(1);
	}
}

static int threads_start(void)
{
	int error;

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

	/* 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();
 fail:
	return error;
}

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

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static int new_lockspace(const char *name, const char *cluster,
			 uint32_t flags, int lvblen,
			 const struct dlm_lockspace_ops *ops, void *ops_arg,
			 int *ops_result, dlm_lockspace_t **lockspace)
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{
	struct dlm_ls *ls;
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	int i, size, error;
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	int do_unreg = 0;
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	int namelen = strlen(name);
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	if (namelen > DLM_LOCKSPACE_LEN)
		return -EINVAL;

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

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

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	if (!dlm_user_daemon_available()) {
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		log_print("dlm user daemon not available");
		error = -EUNATCH;
		goto out;
	}

	if (ops && ops_result) {
	       	if (!dlm_config.ci_recover_callbacks)
			*ops_result = -EOPNOTSUPP;
		else
			*ops_result = 0;
	}

	if (dlm_config.ci_recover_callbacks && cluster &&
	    strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) {
		log_print("dlm cluster name %s mismatch %s",
			  dlm_config.ci_cluster_name, cluster);
		error = -EBADR;
		goto out;
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	}

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	error = 0;

	spin_lock(&lslist_lock);
	list_for_each_entry(ls, &lslist, ls_list) {
		WARN_ON(ls->ls_create_count <= 0);
		if (ls->ls_namelen != namelen)
			continue;
		if (memcmp(ls->ls_name, name, namelen))
			continue;
		if (flags & DLM_LSFL_NEWEXCL) {
			error = -EEXIST;
			break;
		}
		ls->ls_create_count++;
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		*lockspace = ls;
		error = 1;
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		break;
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	}
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	spin_unlock(&lslist_lock);

	if (error)
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		goto out;
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	error = -ENOMEM;
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	ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_NOFS);
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	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;
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	ls->ls_scan_time = jiffies;
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	if (ops && dlm_config.ci_recover_callbacks) {
		ls->ls_ops = ops;
		ls->ls_ops_arg = ops_arg;
	}

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

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	/* ls_exflags are forced to match among nodes, and we don't
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	   need to require all nodes to have some flags set */
	ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
				    DLM_LSFL_NEWEXCL));
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	size = dlm_config.ci_rsbtbl_size;
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	ls->ls_rsbtbl_size = size;

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	ls->ls_rsbtbl = vmalloc(sizeof(struct dlm_rsbtable) * size);
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	if (!ls->ls_rsbtbl)
		goto out_lsfree;
	for (i = 0; i < size; i++) {
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		ls->ls_rsbtbl[i].keep.rb_node = NULL;
		ls->ls_rsbtbl[i].toss.rb_node = NULL;
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		spin_lock_init(&ls->ls_rsbtbl[i].lock);
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	}

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	idr_init(&ls->ls_lkbidr);
	spin_lock_init(&ls->ls_lkbidr_spin);
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512
	size = dlm_config.ci_dirtbl_size;
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	ls->ls_dirtbl_size = size;

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

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

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	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;

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	ls->ls_debug_rsb_dentry = NULL;
	ls->ls_debug_waiters_dentry = NULL;
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	init_waitqueue_head(&ls->ls_uevent_wait);
	ls->ls_uevent_result = 0;
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	init_completion(&ls->ls_members_done);
	ls->ls_members_result = -1;
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	mutex_init(&ls->ls_cb_mutex);
	INIT_LIST_HEAD(&ls->ls_cb_delay);

554
	ls->ls_recoverd_task = NULL;
555
	mutex_init(&ls->ls_recoverd_active);
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	spin_lock_init(&ls->ls_recover_lock);
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	spin_lock_init(&ls->ls_rcom_spin);
	get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t));
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	ls->ls_recover_status = 0;
	ls->ls_recover_seq = 0;
	ls->ls_recover_args = NULL;
	init_rwsem(&ls->ls_in_recovery);
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	init_rwsem(&ls->ls_recv_active);
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	INIT_LIST_HEAD(&ls->ls_requestqueue);
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	mutex_init(&ls->ls_requestqueue_mutex);
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	mutex_init(&ls->ls_clear_proc_locks);
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	ls->ls_recover_buf = kmalloc(dlm_config.ci_buffer_size, GFP_NOFS);
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	if (!ls->ls_recover_buf)
		goto out_dirfree;

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	ls->ls_slot = 0;
	ls->ls_num_slots = 0;
	ls->ls_slots_size = 0;
	ls->ls_slots = NULL;

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	INIT_LIST_HEAD(&ls->ls_recover_list);
	spin_lock_init(&ls->ls_recover_list_lock);
	ls->ls_recover_list_count = 0;
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	ls->ls_local_handle = ls;
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	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);

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	spin_lock(&lslist_lock);
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	ls->ls_create_count = 1;
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	list_add(&ls->ls_list, &lslist);
	spin_unlock(&lslist_lock);

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	if (flags & DLM_LSFL_FS) {
		error = dlm_callback_start(ls);
		if (error) {
			log_error(ls, "can't start dlm_callback %d", error);
			goto out_delist;
		}
	}

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

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	ls->ls_kobj.kset = dlm_kset;
	error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL,
				     "%s", ls->ls_name);
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	if (error)
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		goto out_recoverd;
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	kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
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	/* let kobject handle freeing of ls if there's an error */
	do_unreg = 1;
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	/* 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(). */

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	error = do_uevent(ls, 1);
	if (error)
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		goto out_recoverd;
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	wait_for_completion(&ls->ls_members_done);
	error = ls->ls_members_result;
	if (error)
		goto out_members;

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	dlm_create_debug_file(ls);

	log_debug(ls, "join complete");
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	*lockspace = ls;
	return 0;

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 out_members:
	do_uevent(ls, 0);
	dlm_clear_members(ls);
	kfree(ls->ls_node_array);
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 out_recoverd:
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	dlm_recoverd_stop(ls);
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 out_callback:
	dlm_callback_stop(ls);
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 out_delist:
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	spin_lock(&lslist_lock);
	list_del(&ls->ls_list);
	spin_unlock(&lslist_lock);
	kfree(ls->ls_recover_buf);
 out_dirfree:
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	vfree(ls->ls_dirtbl);
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 out_lkbfree:
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	idr_destroy(&ls->ls_lkbidr);
655
	vfree(ls->ls_rsbtbl);
656
 out_lsfree:
657
	if (do_unreg)
658
		kobject_put(&ls->ls_kobj);
659 660
	else
		kfree(ls);
661 662 663 664 665
 out:
	module_put(THIS_MODULE);
	return error;
}

666 667 668 669
int dlm_new_lockspace(const char *name, const char *cluster,
		      uint32_t flags, int lvblen,
		      const struct dlm_lockspace_ops *ops, void *ops_arg,
		      int *ops_result, dlm_lockspace_t **lockspace)
670 671 672
{
	int error = 0;

673
	mutex_lock(&ls_lock);
674 675 676 677 678
	if (!ls_count)
		error = threads_start();
	if (error)
		goto out;

679 680
	error = new_lockspace(name, cluster, flags, lvblen, ops, ops_arg,
			      ops_result, lockspace);
681 682
	if (!error)
		ls_count++;
683 684 685
	if (error > 0)
		error = 0;
	if (!ls_count)
686
		threads_stop();
687
 out:
688
	mutex_unlock(&ls_lock);
689 690 691
	return error;
}

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David Teigland 已提交
692
static int lkb_idr_is_local(int id, void *p, void *data)
693
{
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David Teigland 已提交
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
	struct dlm_lkb *lkb = p;

	if (!lkb->lkb_nodeid)
		return 1;
	return 0;
}

static int lkb_idr_is_any(int id, void *p, void *data)
{
	return 1;
}

static int lkb_idr_free(int id, void *p, void *data)
{
	struct dlm_lkb *lkb = p;

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

	dlm_free_lkb(lkb);
	return 0;
}

/* NOTE: We check the lkbidr 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 */

static int lockspace_busy(struct dlm_ls *ls, int force)
{
	int rv;

	spin_lock(&ls->ls_lkbidr_spin);
	if (force == 0) {
		rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_any, ls);
	} else if (force == 1) {
		rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_local, ls);
	} else {
		rv = 0;
732
	}
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David Teigland 已提交
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	spin_unlock(&ls->ls_lkbidr_spin);
	return rv;
735 736 737 738 739
}

static int release_lockspace(struct dlm_ls *ls, int force)
{
	struct dlm_rsb *rsb;
740
	struct rb_node *n;
741 742
	int i, busy, rv;

D
David Teigland 已提交
743
	busy = lockspace_busy(ls, force);
744 745 746

	spin_lock(&lslist_lock);
	if (ls->ls_create_count == 1) {
D
David Teigland 已提交
747
		if (busy) {
748
			rv = -EBUSY;
D
David Teigland 已提交
749
		} else {
750 751 752 753 754 755 756 757 758 759 760 761 762 763 764
			/* remove_lockspace takes ls off lslist */
			ls->ls_create_count = 0;
			rv = 0;
		}
	} else if (ls->ls_create_count > 1) {
		rv = --ls->ls_create_count;
	} else {
		rv = -EINVAL;
	}
	spin_unlock(&lslist_lock);

	if (rv) {
		log_debug(ls, "release_lockspace no remove %d", rv);
		return rv;
	}
765

766
	dlm_device_deregister(ls);
767

768
	if (force < 3 && dlm_user_daemon_available())
769 770 771 772
		do_uevent(ls, 0);

	dlm_recoverd_stop(ls);

773 774
	dlm_callback_stop(ls);

775 776 777 778 779 780 781 782 783 784 785
	remove_lockspace(ls);

	dlm_delete_debug_file(ls);

	kfree(ls->ls_recover_buf);

	/*
	 * Free direntry structs.
	 */

	dlm_dir_clear(ls);
786
	vfree(ls->ls_dirtbl);
787 788

	/*
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David Teigland 已提交
789
	 * Free all lkb's in idr
790 791
	 */

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792 793 794
	idr_for_each(&ls->ls_lkbidr, lkb_idr_free, ls);
	idr_remove_all(&ls->ls_lkbidr);
	idr_destroy(&ls->ls_lkbidr);
795 796 797 798 799 800

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

	for (i = 0; i < ls->ls_rsbtbl_size; i++) {
801 802 803
		while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) {
			rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
			rb_erase(n, &ls->ls_rsbtbl[i].keep);
804
			dlm_free_rsb(rsb);
805 806
		}

807 808 809
		while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) {
			rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
			rb_erase(n, &ls->ls_rsbtbl[i].toss);
810
			dlm_free_rsb(rsb);
811 812 813
		}
	}

814
	vfree(ls->ls_rsbtbl);
815

816 817 818 819 820 821 822
	while (!list_empty(&ls->ls_new_rsb)) {
		rsb = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb,
				       res_hashchain);
		list_del(&rsb->res_hashchain);
		dlm_free_rsb(rsb);
	}

823 824 825 826
	/*
	 * Free structures on any other lists
	 */

827
	dlm_purge_requestqueue(ls);
828 829 830 831 832
	kfree(ls->ls_recover_args);
	dlm_clear_free_entries(ls);
	dlm_clear_members(ls);
	dlm_clear_members_gone(ls);
	kfree(ls->ls_node_array);
833
	log_debug(ls, "release_lockspace final free");
834
	kobject_put(&ls->ls_kobj);
835
	/* The ls structure will be freed when the kobject is done with */
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857

	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;
858
	int error;
859 860 861 862 863

	ls = dlm_find_lockspace_local(lockspace);
	if (!ls)
		return -EINVAL;
	dlm_put_lockspace(ls);
864 865 866 867 868

	mutex_lock(&ls_lock);
	error = release_lockspace(ls, force);
	if (!error)
		ls_count--;
869
	if (!ls_count)
870 871 872 873
		threads_stop();
	mutex_unlock(&ls_lock);

	return error;
874 875
}

876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
void dlm_stop_lockspaces(void)
{
	struct dlm_ls *ls;

 restart:
	spin_lock(&lslist_lock);
	list_for_each_entry(ls, &lslist, ls_list) {
		if (!test_bit(LSFL_RUNNING, &ls->ls_flags))
			continue;
		spin_unlock(&lslist_lock);
		log_error(ls, "no userland control daemon, stopping lockspace");
		dlm_ls_stop(ls);
		goto restart;
	}
	spin_unlock(&lslist_lock);
}
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