fs/dlm/dir.c - linux/kernel/git/mellanox/linux - Git at Google

 /******************************************************************************
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
 **  Copyright (C) 2004-2005 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 "lowcomms.h"
 #include "rcom.h"
 #include "config.h"
 #include "memory.h"
 #include "recover.h"
 #include "util.h"
 #include "lock.h"
 #include "dir.h"


 static void put_free_de(struct dlm_ls *ls, struct dlm_direntry *de)
 {
 	spin_lock(&ls->ls_recover_list_lock);
 	list_add(&de->list, &ls->ls_recover_list);
 	spin_unlock(&ls->ls_recover_list_lock);
 }

 static struct dlm_direntry *get_free_de(struct dlm_ls *ls, int len)
 {
 	int found = 0;
 	struct dlm_direntry *de;

 	spin_lock(&ls->ls_recover_list_lock);
 	list_for_each_entry(de, &ls->ls_recover_list, list) {
 		if (de->length == len) {
 			list_del(&de->list);
 			de->master_nodeid = 0;
 			memset(de->name, 0, len);
 			found = 1;
 			break;
 		}
 	}
 	spin_unlock(&ls->ls_recover_list_lock);

 	if (!found)
 		de = allocate_direntry(ls, len);
 	return de;
 }

 void dlm_clear_free_entries(struct dlm_ls *ls)
 {
 	struct dlm_direntry *de;

 	spin_lock(&ls->ls_recover_list_lock);
 	while (!list_empty(&ls->ls_recover_list)) {
 		de = list_entry(ls->ls_recover_list.next, struct dlm_direntry,
 				list);
 		list_del(&de->list);
 		free_direntry(de);
 	}
 	spin_unlock(&ls->ls_recover_list_lock);
 }

 /*
  * We use the upper 16 bits of the hash value to select the directory node.
  * Low bits are used for distribution of rsb's among hash buckets on each node.
  *
  * To give the exact range wanted (0 to num_nodes-1), we apply a modulus of
  * num_nodes to the hash value.  This value in the desired range is used as an
  * offset into the sorted list of nodeid's to give the particular nodeid.
  */

 int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash)
 {
 	struct list_head *tmp;
 	struct dlm_member *memb = NULL;
 	uint32_t node, n = 0;
 	int nodeid;

 	if (ls->ls_num_nodes == 1) {
 		nodeid = dlm_our_nodeid();
 		goto out;
 	}

 	if (ls->ls_node_array) {
 		node = (hash >> 16) % ls->ls_total_weight;
 		nodeid = ls->ls_node_array[node];
 		goto out;
 	}

 	/* make_member_array() failed to kmalloc ls_node_array... */

 	node = (hash >> 16) % ls->ls_num_nodes;

 	list_for_each(tmp, &ls->ls_nodes) {
 		if (n++ != node)
 			continue;
 		memb = list_entry(tmp, struct dlm_member, list);
 		break;
 	}

 	DLM_ASSERT(memb , printk("num_nodes=%u n=%u node=%u\n",
 				 ls->ls_num_nodes, n, node););
 	nodeid = memb->nodeid;
  out:
 	return nodeid;
 }

 int dlm_dir_nodeid(struct dlm_rsb *r)
 {
 	return dlm_hash2nodeid(r->res_ls, r->res_hash);
 }

 static inline uint32_t dir_hash(struct dlm_ls *ls, char *name, int len)
 {
 	uint32_t val;

 	val = jhash(name, len, 0);
 	val &= (ls->ls_dirtbl_size - 1);

 	return val;
 }

 static void add_entry_to_hash(struct dlm_ls *ls, struct dlm_direntry *de)
 {
 	uint32_t bucket;

 	bucket = dir_hash(ls, de->name, de->length);
 	list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
 }

 static struct dlm_direntry *search_bucket(struct dlm_ls *ls, char *name,
 					  int namelen, uint32_t bucket)
 {
 	struct dlm_direntry *de;

 	list_for_each_entry(de, &ls->ls_dirtbl[bucket].list, list) {
 		if (de->length == namelen && !memcmp(name, de->name, namelen))
 			goto out;
 	}
 	de = NULL;
  out:
 	return de;
 }

 void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int namelen)
 {
 	struct dlm_direntry *de;
 	uint32_t bucket;

 	bucket = dir_hash(ls, name, namelen);

 	write_lock(&ls->ls_dirtbl[bucket].lock);

 	de = search_bucket(ls, name, namelen, bucket);

 	if (!de) {
 		log_error(ls, "remove fr %u none", nodeid);
 		goto out;
 	}

 	if (de->master_nodeid != nodeid) {
 		log_error(ls, "remove fr %u ID %u", nodeid, de->master_nodeid);
 		goto out;
 	}

 	list_del(&de->list);
 	free_direntry(de);
  out:
 	write_unlock(&ls->ls_dirtbl[bucket].lock);
 }

 void dlm_dir_clear(struct dlm_ls *ls)
 {
 	struct list_head *head;
 	struct dlm_direntry *de;
 	int i;

 	DLM_ASSERT(list_empty(&ls->ls_recover_list), );

 	for (i = 0; i < ls->ls_dirtbl_size; i++) {
 		write_lock(&ls->ls_dirtbl[i].lock);
 		head = &ls->ls_dirtbl[i].list;
 		while (!list_empty(head)) {
 			de = list_entry(head->next, struct dlm_direntry, list);
 			list_del(&de->list);
 			put_free_de(ls, de);
 		}
 		write_unlock(&ls->ls_dirtbl[i].lock);
 	}
 }

 int dlm_recover_directory(struct dlm_ls *ls)
 {
 	struct dlm_member *memb;
 	struct dlm_direntry *de;
 	char *b, *last_name = NULL;
 	int error = -ENOMEM, last_len, count = 0;
 	uint16_t namelen;

 	log_debug(ls, "dlm_recover_directory");

 	if (dlm_no_directory(ls))
 		goto out_status;

 	dlm_dir_clear(ls);

 	last_name = kmalloc(DLM_RESNAME_MAXLEN, GFP_KERNEL);
 	if (!last_name)
 		goto out;

 	list_for_each_entry(memb, &ls->ls_nodes, list) {
 		memset(last_name, 0, DLM_RESNAME_MAXLEN);
 		last_len = 0;

 		for (;;) {
 			error = dlm_recovery_stopped(ls);
 			if (error)
 				goto out_free;

 			error = dlm_rcom_names(ls, memb->nodeid,
 					       last_name, last_len);
 			if (error)
 				goto out_free;

 			schedule();

 			/*
 			 * pick namelen/name pairs out of received buffer
 			 */

 			b = ls->ls_recover_buf + sizeof(struct dlm_rcom);

 			for (;;) {
 				memcpy(&namelen, b, sizeof(uint16_t));
 				namelen = be16_to_cpu(namelen);
 				b += sizeof(uint16_t);

 				/* namelen of 0xFFFFF marks end of names for
 				   this node; namelen of 0 marks end of the
 				   buffer */

 				if (namelen == 0xFFFF)
 					goto done;
 				if (!namelen)
 					break;

 				error = -ENOMEM;
 				de = get_free_de(ls, namelen);
 				if (!de)
 					goto out_free;

 				de->master_nodeid = memb->nodeid;
 				de->length = namelen;
 				last_len = namelen;
 				memcpy(de->name, b, namelen);
 				memcpy(last_name, b, namelen);
 				b += namelen;

 				add_entry_to_hash(ls, de);
 				count++;
 			}
 		}
          done:
 		;
 	}

  out_status:
 	error = 0;
 	dlm_set_recover_status(ls, DLM_RS_DIR);
 	log_debug(ls, "dlm_recover_directory %d entries", count);
  out_free:
 	kfree(last_name);
  out:
 	dlm_clear_free_entries(ls);
 	return error;
 }

 static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
 		     int namelen, int *r_nodeid)
 {
 	struct dlm_direntry *de, *tmp;
 	uint32_t bucket;

 	bucket = dir_hash(ls, name, namelen);

 	write_lock(&ls->ls_dirtbl[bucket].lock);
 	de = search_bucket(ls, name, namelen, bucket);
 	if (de) {
 		*r_nodeid = de->master_nodeid;
 		write_unlock(&ls->ls_dirtbl[bucket].lock);
 		if (*r_nodeid == nodeid)
 			return -EEXIST;
 		return 0;
 	}

 	write_unlock(&ls->ls_dirtbl[bucket].lock);

 	de = allocate_direntry(ls, namelen);
 	if (!de)
 		return -ENOMEM;

 	de->master_nodeid = nodeid;
 	de->length = namelen;
 	memcpy(de->name, name, namelen);

 	write_lock(&ls->ls_dirtbl[bucket].lock);
 	tmp = search_bucket(ls, name, namelen, bucket);
 	if (tmp) {
 		free_direntry(de);
 		de = tmp;
 	} else {
 		list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
 	}
 	*r_nodeid = de->master_nodeid;
 	write_unlock(&ls->ls_dirtbl[bucket].lock);
 	return 0;
 }

 int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen,
 		   int *r_nodeid)
 {
 	return get_entry(ls, nodeid, name, namelen, r_nodeid);
 }

 /* Copy the names of master rsb's into the buffer provided.
    Only select names whose dir node is the given nodeid. */

 void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen,
  			   char *outbuf, int outlen, int nodeid)
 {
 	struct list_head *list;
 	struct dlm_rsb *start_r = NULL, *r = NULL;
 	int offset = 0, start_namelen, error, dir_nodeid;
 	char *start_name;
 	uint16_t be_namelen;

 	/*
 	 * Find the rsb where we left off (or start again)
 	 */

 	start_namelen = inlen;
 	start_name = inbuf;

 	if (start_namelen > 1) {
 		/*
 		 * We could also use a find_rsb_root() function here that
 		 * searched the ls_root_list.
 		 */
 		error = dlm_find_rsb(ls, start_name, start_namelen, R_MASTER,
 				     &start_r);
 		DLM_ASSERT(!error && start_r,
 			   printk("error %d\n", error););
 		DLM_ASSERT(!list_empty(&start_r->res_root_list),
 			   dlm_print_rsb(start_r););
 		dlm_put_rsb(start_r);
 	}

 	/*
 	 * Send rsb names for rsb's we're master of and whose directory node
 	 * matches the requesting node.
 	 */

 	down_read(&ls->ls_root_sem);
 	if (start_r)
 		list = start_r->res_root_list.next;
 	else
 		list = ls->ls_root_list.next;

 	for (offset = 0; list != &ls->ls_root_list; list = list->next) {
 		r = list_entry(list, struct dlm_rsb, res_root_list);
 		if (r->res_nodeid)
 			continue;

 		dir_nodeid = dlm_dir_nodeid(r);
 		if (dir_nodeid != nodeid)
 			continue;

 		/*
 		 * The block ends when we can't fit the following in the
 		 * remaining buffer space:
 		 * namelen (uint16_t) +
 		 * name (r->res_length) +
 		 * end-of-block record 0x0000 (uint16_t)
 		 */

 		if (offset + sizeof(uint16_t)*2 + r->res_length > outlen) {
 			/* Write end-of-block record */
 			be_namelen = 0;
 			memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
 			offset += sizeof(uint16_t);
 			goto out;
 		}

 		be_namelen = cpu_to_be16(r->res_length);
 		memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
 		offset += sizeof(uint16_t);
 		memcpy(outbuf + offset, r->res_name, r->res_length);
 		offset += r->res_length;
 	}

 	/*
 	 * If we've reached the end of the list (and there's room) write a
 	 * terminating record.
 	 */

 	if ((list == &ls->ls_root_list) &&
 	    (offset + sizeof(uint16_t) <= outlen)) {
 		be_namelen = 0xFFFF;
 		memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
 		offset += sizeof(uint16_t);
 	}

  out:
 	up_read(&ls->ls_root_sem);
 }
	/******************************************************************************
	*******************************************************************************
	**
	** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	** Copyright (C) 2004-2005 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 "lowcomms.h"
	#include "rcom.h"
	#include "config.h"
	#include "memory.h"
	#include "recover.h"
	#include "util.h"
	#include "lock.h"
	#include "dir.h"


	static void put_free_de(struct dlm_ls ls, struct dlm_direntry de)
	{
	spin_lock(&ls->ls_recover_list_lock);
	list_add(&de->list, &ls->ls_recover_list);
	spin_unlock(&ls->ls_recover_list_lock);
	}

	static struct dlm_direntry get_free_de(struct dlm_ls ls, int len)
	{
	int found = 0;
	struct dlm_direntry *de;

	spin_lock(&ls->ls_recover_list_lock);
	list_for_each_entry(de, &ls->ls_recover_list, list) {
	if (de->length == len) {
	list_del(&de->list);
	de->master_nodeid = 0;
	memset(de->name, 0, len);
	found = 1;
	break;
	}
	}
	spin_unlock(&ls->ls_recover_list_lock);

	if (!found)
	de = allocate_direntry(ls, len);
	return de;
	}

	void dlm_clear_free_entries(struct dlm_ls *ls)
	{
	struct dlm_direntry *de;

	spin_lock(&ls->ls_recover_list_lock);
	while (!list_empty(&ls->ls_recover_list)) {
	de = list_entry(ls->ls_recover_list.next, struct dlm_direntry,
	list);
	list_del(&de->list);
	free_direntry(de);
	}
	spin_unlock(&ls->ls_recover_list_lock);
	}

	/*
	* We use the upper 16 bits of the hash value to select the directory node.
	* Low bits are used for distribution of rsb's among hash buckets on each node.
	*
	* To give the exact range wanted (0 to num_nodes-1), we apply a modulus of
	* num_nodes to the hash value. This value in the desired range is used as an
	* offset into the sorted list of nodeid's to give the particular nodeid.
	*/

	int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash)
	{
	struct list_head *tmp;
	struct dlm_member *memb = NULL;
	uint32_t node, n = 0;
	int nodeid;

	if (ls->ls_num_nodes == 1) {
	nodeid = dlm_our_nodeid();
	goto out;
	}

	if (ls->ls_node_array) {
	node = (hash >> 16) % ls->ls_total_weight;
	nodeid = ls->ls_node_array[node];
	goto out;
	}

	/* make_member_array() failed to kmalloc ls_node_array... */

	node = (hash >> 16) % ls->ls_num_nodes;

	list_for_each(tmp, &ls->ls_nodes) {
	if (n++ != node)
	continue;
	memb = list_entry(tmp, struct dlm_member, list);
	break;
	}

	DLM_ASSERT(memb , printk("num_nodes=%u n=%u node=%u\n",
	ls->ls_num_nodes, n, node););
	nodeid = memb->nodeid;
	out:
	return nodeid;
	}

	int dlm_dir_nodeid(struct dlm_rsb *r)
	{
	return dlm_hash2nodeid(r->res_ls, r->res_hash);
	}

	static inline uint32_t dir_hash(struct dlm_ls ls, char name, int len)
	{
	uint32_t val;

	val = jhash(name, len, 0);
	val &= (ls->ls_dirtbl_size - 1);

	return val;
	}

	static void add_entry_to_hash(struct dlm_ls ls, struct dlm_direntry de)
	{
	uint32_t bucket;

	bucket = dir_hash(ls, de->name, de->length);
	list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
	}

	static struct dlm_direntry search_bucket(struct dlm_ls ls, char *name,
	int namelen, uint32_t bucket)
	{
	struct dlm_direntry *de;

	list_for_each_entry(de, &ls->ls_dirtbl[bucket].list, list) {
	if (de->length == namelen && !memcmp(name, de->name, namelen))
	goto out;
	}
	de = NULL;
	out:
	return de;
	}

	void dlm_dir_remove_entry(struct dlm_ls ls, int nodeid, char name, int namelen)
	{
	struct dlm_direntry *de;
	uint32_t bucket;

	bucket = dir_hash(ls, name, namelen);

	write_lock(&ls->ls_dirtbl[bucket].lock);

	de = search_bucket(ls, name, namelen, bucket);

	if (!de) {
	log_error(ls, "remove fr %u none", nodeid);
	goto out;
	}

	if (de->master_nodeid != nodeid) {
	log_error(ls, "remove fr %u ID %u", nodeid, de->master_nodeid);
	goto out;
	}

	list_del(&de->list);
	free_direntry(de);
	out:
	write_unlock(&ls->ls_dirtbl[bucket].lock);
	}

	void dlm_dir_clear(struct dlm_ls *ls)
	{
	struct list_head *head;
	struct dlm_direntry *de;
	int i;

	DLM_ASSERT(list_empty(&ls->ls_recover_list), );

	for (i = 0; i < ls->ls_dirtbl_size; i++) {
	write_lock(&ls->ls_dirtbl[i].lock);
	head = &ls->ls_dirtbl[i].list;
	while (!list_empty(head)) {
	de = list_entry(head->next, struct dlm_direntry, list);
	list_del(&de->list);
	put_free_de(ls, de);
	}
	write_unlock(&ls->ls_dirtbl[i].lock);
	}
	}

	int dlm_recover_directory(struct dlm_ls *ls)
	{
	struct dlm_member *memb;
	struct dlm_direntry *de;
	char b, last_name = NULL;
	int error = -ENOMEM, last_len, count = 0;
	uint16_t namelen;

	log_debug(ls, "dlm_recover_directory");

	if (dlm_no_directory(ls))
	goto out_status;

	dlm_dir_clear(ls);

	last_name = kmalloc(DLM_RESNAME_MAXLEN, GFP_KERNEL);
	if (!last_name)
	goto out;

	list_for_each_entry(memb, &ls->ls_nodes, list) {
	memset(last_name, 0, DLM_RESNAME_MAXLEN);
	last_len = 0;

	for (;;) {
	error = dlm_recovery_stopped(ls);
	if (error)
	goto out_free;

	error = dlm_rcom_names(ls, memb->nodeid,
	last_name, last_len);
	if (error)
	goto out_free;

	schedule();

	/*
	* pick namelen/name pairs out of received buffer
	*/

	b = ls->ls_recover_buf + sizeof(struct dlm_rcom);

	for (;;) {
	memcpy(&namelen, b, sizeof(uint16_t));
	namelen = be16_to_cpu(namelen);
	b += sizeof(uint16_t);

	/* namelen of 0xFFFFF marks end of names for
	this node; namelen of 0 marks end of the
	buffer */

	if (namelen == 0xFFFF)
	goto done;
	if (!namelen)
	break;

	error = -ENOMEM;
	de = get_free_de(ls, namelen);
	if (!de)
	goto out_free;

	de->master_nodeid = memb->nodeid;
	de->length = namelen;
	last_len = namelen;
	memcpy(de->name, b, namelen);
	memcpy(last_name, b, namelen);
	b += namelen;

	add_entry_to_hash(ls, de);
	count++;
	}
	}
	done:
	;
	}

	out_status:
	error = 0;
	dlm_set_recover_status(ls, DLM_RS_DIR);
	log_debug(ls, "dlm_recover_directory %d entries", count);
	out_free:
	kfree(last_name);
	out:
	dlm_clear_free_entries(ls);
	return error;
	}

	static int get_entry(struct dlm_ls ls, int nodeid, char name,
	int namelen, int *r_nodeid)
	{
	struct dlm_direntry de, tmp;
	uint32_t bucket;

	bucket = dir_hash(ls, name, namelen);

	write_lock(&ls->ls_dirtbl[bucket].lock);
	de = search_bucket(ls, name, namelen, bucket);
	if (de) {
	*r_nodeid = de->master_nodeid;
	write_unlock(&ls->ls_dirtbl[bucket].lock);
	if (*r_nodeid == nodeid)
	return -EEXIST;
	return 0;
	}

	write_unlock(&ls->ls_dirtbl[bucket].lock);

	de = allocate_direntry(ls, namelen);
	if (!de)
	return -ENOMEM;

	de->master_nodeid = nodeid;
	de->length = namelen;
	memcpy(de->name, name, namelen);

	write_lock(&ls->ls_dirtbl[bucket].lock);
	tmp = search_bucket(ls, name, namelen, bucket);
	if (tmp) {
	free_direntry(de);
	de = tmp;
	} else {
	list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
	}
	*r_nodeid = de->master_nodeid;
	write_unlock(&ls->ls_dirtbl[bucket].lock);
	return 0;
	}

	int dlm_dir_lookup(struct dlm_ls ls, int nodeid, char name, int namelen,
	int *r_nodeid)
	{
	return get_entry(ls, nodeid, name, namelen, r_nodeid);
	}

	/* Copy the names of master rsb's into the buffer provided.
	Only select names whose dir node is the given nodeid. */

	void dlm_copy_master_names(struct dlm_ls ls, char inbuf, int inlen,
	char *outbuf, int outlen, int nodeid)
	{
	struct list_head *list;
	struct dlm_rsb start_r = NULL, r = NULL;
	int offset = 0, start_namelen, error, dir_nodeid;
	char *start_name;
	uint16_t be_namelen;

	/*
	* Find the rsb where we left off (or start again)
	*/

	start_namelen = inlen;
	start_name = inbuf;

	if (start_namelen > 1) {
	/*
	* We could also use a find_rsb_root() function here that
	* searched the ls_root_list.
	*/
	error = dlm_find_rsb(ls, start_name, start_namelen, R_MASTER,
	&start_r);
	DLM_ASSERT(!error && start_r,
	printk("error %d\n", error););
	DLM_ASSERT(!list_empty(&start_r->res_root_list),
	dlm_print_rsb(start_r););
	dlm_put_rsb(start_r);
	}

	/*
	* Send rsb names for rsb's we're master of and whose directory node
	* matches the requesting node.
	*/

	down_read(&ls->ls_root_sem);
	if (start_r)
	list = start_r->res_root_list.next;
	else
	list = ls->ls_root_list.next;

	for (offset = 0; list != &ls->ls_root_list; list = list->next) {
	r = list_entry(list, struct dlm_rsb, res_root_list);
	if (r->res_nodeid)
	continue;

	dir_nodeid = dlm_dir_nodeid(r);
	if (dir_nodeid != nodeid)
	continue;

	/*
	* The block ends when we can't fit the following in the
	* remaining buffer space:
	* namelen (uint16_t) +
	* name (r->res_length) +
	* end-of-block record 0x0000 (uint16_t)
	*/

	if (offset + sizeof(uint16_t)*2 + r->res_length > outlen) {
	/* Write end-of-block record */
	be_namelen = 0;
	memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
	offset += sizeof(uint16_t);
	goto out;
	}

	be_namelen = cpu_to_be16(r->res_length);
	memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
	offset += sizeof(uint16_t);
	memcpy(outbuf + offset, r->res_name, r->res_length);
	offset += r->res_length;
	}

	/*
	* If we've reached the end of the list (and there's room) write a
	* terminating record.
	*/

	if ((list == &ls->ls_root_list) &&
	(offset + sizeof(uint16_t) <= outlen)) {
	be_namelen = 0xFFFF;
	memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
	offset += sizeof(uint16_t);
	}

	out:
	up_read(&ls->ls_root_sem);
	}