diff --git a/tools/sfex_lib.c b/tools/sfex_lib.c
index 59d05486a..2d01602fb 100644
--- a/tools/sfex_lib.c
+++ b/tools/sfex_lib.c
@@ -1,474 +1,474 @@
 /*-------------------------------------------------------------------------
  * 
  * Shared Disk File EXclusiveness Control Program(SF-EX)
  *
  * sfex_lib.c --- Libraries for other SF-EX modules.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  * 
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  * 
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  
  * 02110-1301, USA.
  *
  * Copyright (c) 2007 NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * $Id$
  *
  *-------------------------------------------------------------------------*/
 
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/utsname.h>
 #include <sys/ioctl.h>
 #include <syslog.h>
 #include <linux/fs.h>
 
 #include "sfex.h"
 #include "sfex_lib.h"
 
 static void *locked_mem;
 static int dev_fd;
 unsigned long sector_size = 0;
 
 int
 prepare_lock (const char *device)
 {
   int sec_tmp = 0;
 
   do {
     dev_fd = open (device, O_RDWR | O_DIRECT | O_SYNC);
     if (dev_fd == -1) {
       if (errno == EINTR || errno == EAGAIN)
 	continue;
       cl_log(LOG_ERR, "can't open device %s: %s\n",
 		    device, strerror (errno));
       exit (3);
     }
     break;
   }
   while (1);
 
   ioctl(dev_fd, BLKSSZGET, &sec_tmp);
   sector_size = (unsigned long)sec_tmp;
   if (sector_size == 0) {
 	  cl_log(LOG_ERR, "Get sector size failed: %s\n", strerror(errno));
 	  exit(EXIT_FAILURE);
   }
 
   if (posix_memalign
       ((void **) (&locked_mem), SFEX_ODIRECT_ALIGNMENT,
        sector_size) != 0) {
     cl_log(LOG_ERR, "Failed to allocate aligned memory\n");
     exit (3);
   }
   memset (locked_mem, 0, sector_size);
 
   return 0;
 }
 
 /*
  * get_progname --- a program name
  *
  * We get program name from directory path. It does not include delimiter 
  * characters. Return value is pointer that point string of program name. 
  * We assume delimiter is '/'.
  */
 const char *
 get_progname (const char *argv0)
 {
   char *p;
 
   p = strrchr (argv0, '/');
   if (p)
     return p + 1;
   else
     return argv0;
 }
 
 /*
  * get_nodename --- get a node name(hostname)
  *
  * We get a node name by using uname(2) and return pointer of it.
  * The error checks are done in this function. The caller does not have 
  * to check return value.
  */
 char *
 get_nodename (void)
 {
   struct utsname u;
   char *n;
 
   if (uname (&u)) {
     cl_log(LOG_ERR, "%s\n", strerror (errno));
     exit (3);
   }
   if (strlen (u.nodename) > SFEX_MAX_NODENAME) {
     cl_log(LOG_ERR,
       "nodename %s is too long. must be less than %lu byte.\n",
        u.nodename, (unsigned long)SFEX_MAX_NODENAME);
     exit (3);
   }
   n = strdup (&u.nodename[0]);
   if (!n) {
     cl_log(LOG_ERR, "%s\n", strerror (errno));
     exit (3);
   }
   return n;
 }
 
 /*
  * init_controldata --- initialize control data
  *
  * We initialize each member of sfex_controldata structure.
  */
 void
 init_controldata (sfex_controldata * cdata, size_t blocksize, int numlocks)
 {
   memcpy (cdata->magic, SFEX_MAGIC, sizeof (cdata->magic));
   cdata->version = SFEX_VERSION;
   cdata->revision = SFEX_REVISION;
   cdata->blocksize = blocksize;
   cdata->numlocks = numlocks;
 }
 
 /*
  * init_lockdata --- initialize lock data
  *
  * We initialize each member of sfex_lockdata structure.
  */
 void
 init_lockdata (sfex_lockdata * ldata)
 {
   ldata->status = SFEX_STATUS_UNLOCK;
   ldata->count = 0;
   ldata->nodename[0] = 0;
 }
 
 /*
  * write_controldata --- write control data into file
  *
  * We write sfex_controldata struct into file. We open a file with 
  * synchronization mode and write out control data.
  *
  * cdata --- pointer of control data
  *
  * device --- name of target file
  */
 void
 write_controldata (const sfex_controldata * cdata)
 {
   sfex_controldata_ondisk *block;
   int fd;
 
   block = (sfex_controldata_ondisk *) (locked_mem);
 
   /* We write control data into the buffer with given format. */
   /* We write the offset value of each field of the control data directly.
    * Because a point using this value is limited to two places, we do not 
    * use macro. If you change the following offset values, you must change 
    * values in the read_controldata() function.
    */
   memset (block, 0, cdata->blocksize);
   memcpy (block->magic, cdata->magic, sizeof (block->magic));
   snprintf ((char *) (block->version), sizeof (block->version), "%d",
 	    cdata->version);
   snprintf ((char *) (block->revision), sizeof (block->revision), "%d",
 	    cdata->revision);
   snprintf ((char *) (block->blocksize), sizeof (block->blocksize), "%u",
 	    (unsigned)cdata->blocksize);
   snprintf ((char *) (block->numlocks), sizeof (block->numlocks), "%d",
 	    cdata->numlocks);
 
   fd = dev_fd;
   if (lseek (fd, 0, SEEK_SET) == -1) {
     cl_log(LOG_ERR, "can't seek file pointer: %s\n",
 		  strerror (errno));
     exit (3);
   }
 
   /* write buffer into a file  */
   do {
 	  ssize_t s = write (fd, block, cdata->blocksize);
 	  if (s == -1) {
 		  if (errno == EINTR || errno == EAGAIN)
 			  continue;
 		  cl_log(LOG_ERR, "can't write meta-data: %s\n",
 				strerror (errno));
 		  exit (3);
 	  }
 	  else
 		  break;
   }
   while (1);
 }
 
 /*
  * write_lockdata --- write lock data into file
  *
  * We write sfex_lockdata into file and seek file pointer to the given
  * position of lock data.
  *
  * cdata --- pointer for control data
  *
  * ldata --- pointer for lock data
  *
  * device --- file name for write
  *
  * index --- index number for lock data. 1 origine.
  */
 int
 write_lockdata (const sfex_controldata * cdata, const sfex_lockdata * ldata,
 		int index)
 {
   sfex_lockdata_ondisk *block;
   int fd;
 
   block = (sfex_lockdata_ondisk *) locked_mem;
   /* We write lock data into buffer with given format */
   /* We write the offset value of each field of the control data directly.
    * Because a point using this value is limited to two places, we do not 
    * use macro. If you chage the following offset values, you must change 
    * values in the read_lockdata() function.
    */
   memset (block, 0, cdata->blocksize);
   block->status = ldata->status;
   snprintf ((char *) (block->count), sizeof (block->count), "%d",
 	    ldata->count);
   snprintf ((char *) (block->nodename), sizeof (block->nodename), "%s",
 	    ldata->nodename);
 
   fd = dev_fd;
 
   /* seek a file pointer to given position */
   if (lseek (fd, cdata->blocksize * index, SEEK_SET) == -1) {
     cl_log(LOG_ERR, "can't seek file pointer: %s\n",
 		  strerror (errno));
     return -1;
   }
 
   /* write buffer into file */
   do {
     ssize_t s = write (fd, block, cdata->blocksize);
     if (s == -1) {
       if (errno == EINTR || errno == EAGAIN)
 	continue;
       cl_log(LOG_ERR, "can't write meta-data: %s\n",
 		    strerror (errno));
       return -1;
     }
     else if (s != cdata->blocksize) {
       /* if writing atomically failed, this process is error */
       cl_log(LOG_ERR, "can't write meta-data atomically.\n");
       return -1;
     }
     break;
   }
   while (1);
   return 0;
 }
 
 /*
  * read_controldata --- read control data from file
  *
  * read sfex_controldata structure from file.
  *
  * cdata --- pointer for control data
  *
  * device --- file name for reading
  */
 int
 read_controldata (sfex_controldata * cdata)
 {
   sfex_controldata_ondisk *block;
 
   block = (sfex_controldata_ondisk *) (locked_mem);
 
   if (lseek (dev_fd, 0, SEEK_SET) == -1) {
     cl_log(LOG_ERR, "can't seek file pointer: %s\n",
 		  strerror (errno));
     return -1;
   }
 
   /* read data from file */
   do {
 	  ssize_t s = read (dev_fd, block, sector_size);
 	  if (s == -1) {
 		  if (errno == EINTR || errno == EAGAIN)
 			  continue;
 		  cl_log(LOG_ERR,
 			  "can't read controldata meta-data: %s\n",
 			   strerror (errno));
 		  return -1;
 	  }
 	  else
 		  break;
   } while (1);
 
   /* read control data from buffer */
   /* 1. check the magic number.  2. check null terminator of each field 
      3. check the version number.  4. Unmuch of revision number is allowed  */
   /* We write the offset value of each field of the control data directly.
    * Because a point using this value is limited to two places, we do not 
    * use macro. If you chage the following offset values, you must change 
    * values in the write_controldata() function.
    */
   memcpy (cdata->magic, block->magic, 4);
   if (memcmp (cdata->magic, SFEX_MAGIC, sizeof (cdata->magic))) {
     cl_log(LOG_ERR, "magic number mismatched. %c%c%c%c <-> %s\n", block->magic[0], block->magic[1], block->magic[2], block->magic[3], SFEX_MAGIC);
     return -1;
   }
   if (block->version[sizeof (block->version)-1]
       || block->revision[sizeof (block->revision)-1]
       || block->blocksize[sizeof (block->blocksize)-1]
       || block->numlocks[sizeof (block->numlocks)-1]) {
     cl_log(LOG_ERR, "control data format error.\n");
     return -1;
   }
   cdata->version = atoi ((char *) (block->version));
   if (cdata->version != SFEX_VERSION) {
     cl_log(LOG_ERR,
       "version number mismatched. program is %d, data is %d.\n",
        SFEX_VERSION, cdata->version);
     return -1;
   }
   cdata->revision = atoi ((char *) (block->revision));
   cdata->blocksize = atoi ((char *) (block->blocksize));
   cdata->numlocks = atoi ((char *) (block->numlocks));
 
   return 0;
 }
 
 /*
  * read_lockdata --- read lock data from file
  *
  * read sfex_lockdata from file and seek file pointer to head position of the 
  * file.
  *
  * cdata --- pointer for control data
  *
  * ldata --- pointer for lock data. Read lock data are stored into this 
  * pointed area.
  *
  * device --- file name of source file
  *
  * index --- index number. 1 origin.
  */
 int
 read_lockdata (const sfex_controldata * cdata, sfex_lockdata * ldata,
 	       int index)
 {
   sfex_lockdata_ondisk *block;
   int fd;
 
   block = (sfex_lockdata_ondisk *) (locked_mem);
 
   fd = dev_fd;
 
   /* seek a file pointer to given position */
   if (lseek (fd, cdata->blocksize * index, SEEK_SET) == -1) {
     cl_log(LOG_ERR, "can't seek file pointer: %s\n",
 		  strerror (errno));
     return -1;
   }
 
   /* read from file */
   do {
     ssize_t s = read (fd, block, cdata->blocksize);
     if (s == -1) {
       if (errno == EINTR || errno == EAGAIN)
 	continue;
       cl_log(LOG_ERR, "can't read lockdata meta-data: %s\n",
 		    strerror (errno));
       return -1;
     }
     else if (s != cdata->blocksize) {
       cl_log(LOG_ERR, "can't read meta-data atomically.\n");
       return -1;
     }
     break;
   }
   while (1);
 
   /* read control data form buffer */
   /* 1. check null terminator of each field 2. check the status */
   /* We write the offset value of each field of the control data directly.
    * Because a point using this value is limited to two places, we do not 
    * use macro. If you chage the following offset values, you must change 
    * values in the write_lockdata() function.
    */
   if (block->count[sizeof(block->count)-1] || block->nodename[sizeof(block->nodename)-1]) {
     cl_log(LOG_ERR, "lock data format error.\n");
     return -1;
   }
   ldata->status = block->status;
   if (ldata->status != SFEX_STATUS_UNLOCK
       && ldata->status != SFEX_STATUS_LOCK) {
     cl_log(LOG_ERR, "lock data format error.\n");
     return -1;
   }
   ldata->count = atoi ((char *) (block->count));
-  strncpy ((char *) (ldata->nodename), (const char *) (block->nodename), sizeof(block->nodename) - 0);
+  strncpy ((char *) (ldata->nodename), (const char *) (block->nodename), sizeof(ldata->nodename));
 
 #ifdef SFEX_DEBUG
   cl_log(LOG_INFO, "status: %c\n", ldata->status);
   cl_log(LOG_INFO, "count: %d\n", ldata->count);
   cl_log(LOG_INFO, "nodename: %s\n", ldata->nodename);
 #endif
   return 0;
 }
 
 /*
  * lock_index_check --- check the value of index
  *
  * The lock_index_check function checks whether the value of index exceeds
  * the number of lock data on the shared disk.
  *
  * cdata --- pointer for control data
  *
  * index --- index number
  */
 int
 lock_index_check(sfex_controldata * cdata, int index)
 {
         if (read_controldata(cdata) == -1) {
                 cl_log(LOG_ERR, "%s\n", "read_controldata failed in lock_index_check");
                 return -1;
         }
 #ifdef SFEX_DEBUG
         cl_log(LOG_INFO, "version: %d\n", cdata->version);
         cl_log(LOG_INFO, "revision: %d\n", cdata->revision);
         cl_log(LOG_INFO, "blocksize: %d\n", cdata->blocksize);
         cl_log(LOG_INFO, "numlocks: %d\n", cdata->numlocks);
 #endif
 
         if (index > cdata->numlocks) {
                 cl_log(LOG_ERR, "index %d is too large. %d locks are stored.\n",
                                 index, cdata->numlocks);
                 return -1;
         }
 
         if (cdata->blocksize != sector_size) {
                 cl_log(LOG_ERR, "sector_size is not the same as the blocksize.\n");
                 return -1;
         }
         return 0;
 }