glusterd: support for volume version and cksumv3.1.0qa8

Signed-off-by: Vijay Bellur <vijay@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 1310 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1310

15 files changed, 847 insertions, 223 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index eef865ec500..f3386fe2b62 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -72,10 +72,10 @@ log_base2 (unsigned long x)
 
 
 int32_t
-gf_resolve_ip6 (const char *hostname, 
-		uint16_t port, 
-		int family, 
-		void **dnscache, 
+gf_resolve_ip6 (const char *hostname,
+		uint16_t port,
+		int family,
+		void **dnscache,
 		struct addrinfo **addr_info)
 {
 	int32_t ret = 0;
@@ -189,18 +189,18 @@ gf_log_volume_file (FILE *specfp)
 	extern FILE *gf_log_logfile;
 	int          lcount = 0;
 	char         data[GF_UNIT_KB];
-	
+
 	fseek (specfp, 0L, SEEK_SET);
-	
+
 	fprintf (gf_log_logfile, "Given volfile:\n");
-	fprintf (gf_log_logfile, 
+	fprintf (gf_log_logfile,
 		 "+---------------------------------------"
 		 "---------------------------------------+\n");
 	while (fgets (data, GF_UNIT_KB, specfp) != NULL){
 		lcount++;
 		fprintf (gf_log_logfile, "%3d: %s", lcount, data);
 	}
-	fprintf (gf_log_logfile, 
+	fprintf (gf_log_logfile,
 		 "\n+---------------------------------------"
 		 "---------------------------------------+\n");
 	fflush (gf_log_logfile);
@@ -419,28 +419,28 @@ char *
 gf_trim (char *string)
 {
 	register char *s, *t;
-  
+
 	if (string == NULL)
 	{
 		return NULL;
 	}
-  
+
 	for (s = string; isspace (*s); s++)
 		;
-  
+
 	if (*s == 0)
 		return s;
-  
+
 	t = s + strlen (s) - 1;
 	while (t > s && isspace (*t))
 		t--;
 	*++t = '\0';
-  
+
 	return s;
 }
 
-int 
-gf_strsplit (const char *str, const char *delim, 
+int
+gf_strsplit (const char *str, const char *delim,
 	     char ***tokens, int *token_count)
 {
 	char *_running = NULL;
@@ -450,57 +450,57 @@ gf_strsplit (const char *str, const char *delim,
 	int count = 0;
 	int i = 0;
 	int j = 0;
-  
+
 	if (str == NULL || delim == NULL || tokens == NULL || token_count == NULL)
 	{
 		return -1;
 	}
-  
+
         _running = gf_strdup (str);
 	if (_running == NULL)
 	{
 		return -1;
 	}
 	running = _running;
-  
+
 	while ((token = strsep (&running, delim)) != NULL)
 	{
 		if (token[0] != '\0')
 			count++;
 	}
 	GF_FREE (_running);
-  
+
         _running = gf_strdup (str);
 	if (_running == NULL)
 	{
 		return -1;
 	}
 	running = _running;
-  
+
 	if ((token_list = GF_CALLOC (count, sizeof (char *),
                                         gf_common_mt_char)) == NULL)
 	{
 		GF_FREE (_running);
 		return -1;
 	}
-  
+
 	while ((token = strsep (&running, delim)) != NULL)
 	{
 		if (token[0] == '\0')
 			continue;
-      
+
                 token_list[i] = gf_strdup (token);
 		if (token_list[i] == NULL)
 			goto free_exit;
                 i++;
 	}
-  
+
 	GF_FREE (_running);
-  
+
 	*tokens = token_list;
 	*token_count = count;
 	return 0;
-  
+
 free_exit:
 	GF_FREE (_running);
 	for (j = 0; j < i; j++)
@@ -511,7 +511,7 @@ free_exit:
 	return -1;
 }
 
-int 
+int
 gf_strstr (const char *str, const char *delim, const char *match)
 {
         char *tmp      = NULL;
@@ -551,41 +551,41 @@ int
 gf_volume_name_validate (const char *volume_name)
 {
 	const char *vname = NULL;
-  
+
 	if (volume_name == NULL)
 	{
 		return -1;
 	}
-  
+
 	if (!isalpha (volume_name[0]))
 	{
 		return 1;
 	}
-  
+
 	for (vname = &volume_name[1]; *vname != '\0'; vname++)
 	{
 		if (!(isalnum (*vname) || *vname == '_'))
 			return 1;
 	}
-  
+
 	return 0;
 }
 
 
-int 
+int
 gf_string2time (const char *str, uint32_t *n)
 {
 	unsigned long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
 	const char *s = NULL;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	for (s = str; *s != '\0'; s++)
 	{
 		if (isspace (*s))
@@ -598,48 +598,48 @@ gf_string2time (const char *str, uint32_t *n)
 		}
 		break;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtol (str, &tail, 0);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
-	if (!((tail[0] == '\0') || 
+
+	if (!((tail[0] == '\0') ||
 	      ((tail[0] == 's') && (tail[1] == '\0')) ||
 	      ((tail[0] == 's') && (tail[1] == 'e') && (tail[2] == 'c') && (tail[3] == '\0'))))
 	{
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
 
-int 
+int
 gf_string2percent (const char *str, uint32_t *n)
 {
 	unsigned long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
 	const char *s = NULL;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	for (s = str; *s != '\0'; s++)
 	{
 		if (isspace (*s))
@@ -652,55 +652,55 @@ gf_string2percent (const char *str, uint32_t *n)
 		}
 		break;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtol (str, &tail, 0);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
-	if (!((tail[0] == '\0') || 
+
+	if (!((tail[0] == '\0') ||
 	      ((tail[0] == '%') && (tail[1] == '\0'))))
 	{
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
 
-static int 
+static int
 _gf_string2long (const char *str, long *n, int base)
 {
 	long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtol (str, &tail, base);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
@@ -711,26 +711,26 @@ _gf_string2long (const char *str, long *n, int base)
 		/* bala: invalid integer format */
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
-static int 
+static int
 _gf_string2ulong (const char *str, unsigned long *n, int base)
 {
 	unsigned long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
 	const char *s = NULL;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	for (s = str; *s != '\0'; s++)
 	{
 		if (isspace (*s))
@@ -739,52 +739,52 @@ _gf_string2ulong (const char *str, unsigned long *n, int base)
 		}
 		if (*s == '-')
 		{
-			/* bala: we do not support suffixed (-) sign and 
+			/* bala: we do not support suffixed (-) sign and
 			   invalid integer format */
 			return -1;
 		}
 		break;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtoul (str, &tail, base);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
+
 	if (tail[0] != '\0')
 	{
 		/* bala: invalid integer format */
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
-static int 
+static int
 _gf_string2uint (const char *str, unsigned int *n, int base)
 {
 	unsigned long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
 	const char *s = NULL;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	for (s = str; *s != '\0'; s++)
 	{
 		if (isspace (*s))
@@ -793,123 +793,123 @@ _gf_string2uint (const char *str, unsigned int *n, int base)
 		}
 		if (*s == '-')
 		{
-			/* bala: we do not support suffixed (-) sign and 
+			/* bala: we do not support suffixed (-) sign and
 			   invalid integer format */
 			return -1;
 		}
 		break;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtoul (str, &tail, base);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
+
 	if (tail[0] != '\0')
 	{
 		/* bala: invalid integer format */
 		return -1;
 	}
-  
+
 	*n = (unsigned int)value;
-  
+
 	return 0;
 }
 
-static int 
+static int
 _gf_string2double (const char *str, double *n)
 {
 	double value     = 0.0;
 	char   *tail     = NULL;
 	int    old_errno = 0;
-  
+
 	if (str == NULL || n == NULL) {
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtod (str, &tail);
-  
+
 	if (errno == ERANGE || errno == EINVAL)	{
 		return -1;
 	}
-  
+
 	if (errno == 0)	{
 		errno = old_errno;
 	}
-  
+
 	if (tail[0] != '\0') {
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
-static int 
+static int
 _gf_string2longlong (const char *str, long long *n, int base)
 {
 	long long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtoll (str, &tail, base);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
+
 	if (tail[0] != '\0')
 	{
 		/* bala: invalid integer format */
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
-static int 
+static int
 _gf_string2ulonglong (const char *str, unsigned long long *n, int base)
 {
 	unsigned long long value = 0;
 	char *tail = NULL;
 	int old_errno = 0;
 	const char *s = NULL;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	for (s = str; *s != '\0'; s++)
 	{
 		if (isspace (*s))
@@ -918,57 +918,57 @@ _gf_string2ulonglong (const char *str, unsigned long long *n, int base)
 		}
 		if (*s == '-')
 		{
-			/* bala: we do not support suffixed (-) sign and 
+			/* bala: we do not support suffixed (-) sign and
 			   invalid integer format */
 			return -1;
 		}
 		break;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtoull (str, &tail, base);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
+
 	if (tail[0] != '\0')
 	{
 		/* bala: invalid integer format */
 		return -1;
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
-int 
+int
 gf_string2long (const char *str, long *n)
 {
 	return _gf_string2long (str, n, 0);
 }
 
-int 
+int
 gf_string2ulong (const char *str, unsigned long *n)
 {
 	return _gf_string2ulong (str, n, 0);
 }
 
-int 
+int
 gf_string2int (const char *str, int *n)
 {
 	return _gf_string2long (str, (long *) n, 0);
 }
 
-int 
+int
 gf_string2uint (const char *str, unsigned int *n)
 {
 	return _gf_string2uint (str, n, 0);
@@ -980,284 +980,284 @@ gf_string2double (const char *str, double *n)
 	return _gf_string2double (str, n);
 }
 
-int 
+int
 gf_string2longlong (const char *str, long long *n)
 {
 	return _gf_string2longlong (str, n, 0);
 }
 
-int 
+int
 gf_string2ulonglong (const char *str, unsigned long long *n)
 {
 	return _gf_string2ulonglong (str, n, 0);
 }
 
-int 
+int
 gf_string2int8 (const char *str, int8_t *n)
 {
 	long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2long (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= INT8_MIN && l <= INT8_MAX)
 	{
 		*n = (int8_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2int16 (const char *str, int16_t *n)
 {
 	long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2long (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= INT16_MIN && l <= INT16_MAX)
 	{
 		*n = (int16_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2int32 (const char *str, int32_t *n)
 {
 	long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2long (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= INT32_MIN && l <= INT32_MAX)
 	{
 		*n = (int32_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2int64 (const char *str, int64_t *n)
 {
 	long long l = 0LL;
 	int rv = 0;
-  
+
 	rv = _gf_string2longlong (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= INT64_MIN && l <= INT64_MAX)
 	{
 		*n = (int64_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint8 (const char *str, uint8_t *n)
 {
 	unsigned long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulong (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT8_MAX)
 	{
 		*n = (uint8_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint16 (const char *str, uint16_t *n)
 {
 	unsigned long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulong (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT16_MAX)
 	{
 		*n = (uint16_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint32 (const char *str, uint32_t *n)
 {
 	unsigned long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulong (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT32_MAX)
 	{
 		*n = (uint32_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint64 (const char *str, uint64_t *n)
 {
 	unsigned long long l = 0ULL;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulonglong (str, &l, 0);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT64_MAX)
 	{
 		*n = (uint64_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2ulong_base10 (const char *str, unsigned long *n)
 {
 	return _gf_string2ulong (str, n, 10);
 }
 
-int 
+int
 gf_string2uint_base10 (const char *str, unsigned int *n)
 {
 	return _gf_string2uint (str,  n, 10);
 }
 
-int 
+int
 gf_string2uint8_base10 (const char *str, uint8_t *n)
 {
 	unsigned long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulong (str, &l, 10);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT8_MAX)
 	{
 		*n = (uint8_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint16_base10 (const char *str, uint16_t *n)
 {
 	unsigned long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulong (str, &l, 10);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT16_MAX)
 	{
 		*n = (uint16_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint32_base10 (const char *str, uint32_t *n)
 {
 	unsigned long l = 0L;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulong (str, &l, 10);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT32_MAX)
 	{
 		*n = (uint32_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2uint64_base10 (const char *str, uint64_t *n)
 {
 	unsigned long long l = 0ULL;
 	int rv = 0;
-  
+
 	rv = _gf_string2ulonglong (str, &l, 10);
 	if (rv != 0)
 		return rv;
-  
+
 	if (l >= 0 && l <= UINT64_MAX)
 	{
 		*n = (uint64_t) l;
 		return 0;
 	}
-  
+
 	errno = ERANGE;
 	return -1;
 }
 
-int 
+int
 gf_string2bytesize (const char *str, uint64_t *n)
 {
 	uint64_t value = 0ULL;
 	char *tail = NULL;
 	int old_errno = 0;
 	const char *s = NULL;
-  
+
 	if (str == NULL || n == NULL)
 	{
 		errno = EINVAL;
 		return -1;
 	}
-  
+
 	for (s = str; *s != '\0'; s++)
 	{
 		if (isspace (*s))
@@ -1266,27 +1266,27 @@ gf_string2bytesize (const char *str, uint64_t *n)
 		}
 		if (*s == '-')
 		{
-			/* bala: we do not support suffixed (-) sign and 
+			/* bala: we do not support suffixed (-) sign and
 			   invalid integer format */
 			return -1;
 		}
 		break;
 	}
-  
+
 	old_errno = errno;
 	errno = 0;
 	value = strtoull (str, &tail, 10);
-  
+
 	if (errno == ERANGE || errno == EINVAL)
 	{
 		return -1;
 	}
-  
+
 	if (errno == 0)
 	{
 		errno = old_errno;
 	}
-  
+
 	if (tail[0] != '\0')
 	{
 		if (strcasecmp (tail, GF_UNIT_KB_STRING) == 0)
@@ -1309,19 +1309,19 @@ gf_string2bytesize (const char *str, uint64_t *n)
 		{
 			value *= GF_UNIT_PB;
 		}
-		else 
+		else
 		{
 			/* bala: invalid integer format */
 			return -1;
 		}
 	}
-  
+
 	*n = value;
-  
+
 	return 0;
 }
 
-int64_t 
+int64_t
 gf_str_to_long_long (const char *number)
 {
 	int64_t unit = 1;
@@ -1360,62 +1360,62 @@ gf_str_to_long_long (const char *number)
 	return ret * unit;
 }
 
-int 
+int
 gf_string2boolean (const char *str, gf_boolean_t *b)
 {
 	if (str == NULL) {
 		return -1;
 	}
-	
-	if ((strcasecmp (str, "1") == 0) || 
-	    (strcasecmp (str, "on") == 0) || 
-	    (strcasecmp (str, "yes") == 0) || 
-	    (strcasecmp (str, "true") == 0) || 
+
+	if ((strcasecmp (str, "1") == 0) ||
+	    (strcasecmp (str, "on") == 0) ||
+	    (strcasecmp (str, "yes") == 0) ||
+	    (strcasecmp (str, "true") == 0) ||
 	    (strcasecmp (str, "enable") == 0)) {
 		*b = _gf_true;
 		return 0;
 	}
-	
-	if ((strcasecmp (str, "0") == 0) || 
-	    (strcasecmp (str, "off") == 0) || 
-	    (strcasecmp (str, "no") == 0) || 
-	    (strcasecmp (str, "false") == 0) || 
+
+	if ((strcasecmp (str, "0") == 0) ||
+	    (strcasecmp (str, "off") == 0) ||
+	    (strcasecmp (str, "no") == 0) ||
+	    (strcasecmp (str, "false") == 0) ||
 	    (strcasecmp (str, "disable") == 0)) {
 		*b = _gf_false;
 		return 0;
 	}
-	
+
 	return -1;
 }
 
 
-int 
+int
 gf_lockfd (int fd)
 {
 	struct flock fl;
-	
+
 	fl.l_type = F_WRLCK;
 	fl.l_whence = SEEK_SET;
 	fl.l_start = 0;
 	fl.l_len = 0;
-	
+
 	return fcntl (fd, F_SETLK, &fl);
 }
 
 
-int 
+int
 gf_unlockfd (int fd)
 {
 	struct flock fl;
-	
+
 	fl.l_type = F_UNLCK;
 	fl.l_whence = SEEK_SET;
 	fl.l_start = 0;
 	fl.l_len = 0;
-	
+
 	return fcntl (fd, F_SETLK, &fl);
 }
-  
+
 static void
 compute_checksum (char *buf, size_t size, uint32_t *checksum)
 {
@@ -1428,7 +1428,7 @@ compute_checksum (char *buf, size_t size, uint32_t *checksum)
                 checksum_buf [0] = 0xba;
                 checksum_buf [1] = 0xbe;
                 checksum_buf [2] = 0xb0;
-                checksum_buf [3] = 0x0b;                
+                checksum_buf [3] = 0x0b;
         }
 
         for (ret = 0; ret < (size - 4); ret += 4) {
@@ -1441,14 +1441,14 @@ compute_checksum (char *buf, size_t size, uint32_t *checksum)
         for (ret = 0; ret <= (size % 4); ret++) {
                 checksum_buf[ret] ^= (buf[(size - 4) + ret] << ret);
         }
-        
+
         return;
 }
 
 #define GF_CHECKSUM_BUF_SIZE 1024
 
 int
-get_checksum_for_file (int fd, uint32_t *checksum) 
+get_checksum_for_file (int fd, uint32_t *checksum)
 {
         int ret = -1;
         char buf[GF_CHECKSUM_BUF_SIZE] = {0,};
@@ -1458,7 +1458,7 @@ get_checksum_for_file (int fd, uint32_t *checksum)
         do {
                 ret = read (fd, &buf, GF_CHECKSUM_BUF_SIZE);
                 if (ret > 0)
-                        compute_checksum (buf, GF_CHECKSUM_BUF_SIZE, 
+                        compute_checksum (buf, GF_CHECKSUM_BUF_SIZE,
                                           checksum);
         } while (ret > 0);
 
@@ -1522,3 +1522,29 @@ out:
 
         return ret;
 }
+
+int
+get_checksum_for_path (char *path, uint32_t *checksum)
+{
+        int     ret = -1;
+        int     fd = -1;
+
+        GF_ASSERT (path);
+        GF_ASSERT (checksum);
+
+        fd = open (path, O_RDWR);
+
+        if (fd == -1) {
+                gf_log ("", GF_LOG_ERROR, "Unable to open %s, errno: %d",
+                        path, errno);
+                goto out;
+        }
+
+        ret = get_checksum_for_file (fd, checksum);
+
+out:
+        if (fd != -1)
+                close (fd);
+
+        return ret;
+}
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 93d62f6cbc3..54f52a5a0b1 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -329,6 +329,7 @@ int get_checksum_for_file (int fd, uint32_t *checksum);
 int log_base2 (unsigned long x);
 
 int gf_system (const char *command);
+int get_checksum_for_path (char *path, uint32_t *checksum);
 
 #endif /* _COMMON_UTILS_H */
 
diff --git a/rpc/xdr/src/glusterd1-xdr.c b/rpc/xdr/src/glusterd1-xdr.c
index c7b83b9d575..82d9830c97f 100644
--- a/rpc/xdr/src/glusterd1-xdr.c
+++ b/rpc/xdr/src/glusterd1-xdr.c
@@ -73,6 +73,8 @@ xdr_gd1_mgmt_friend_req (XDR *xdrs, gd1_mgmt_friend_req *objp)
 		 return FALSE;
 	 if (!xdr_int (xdrs, &objp->port))
 		 return FALSE;
+	 if (!xdr_bytes (xdrs, (char **)&objp->vols.vols_val, (u_int *) &objp->vols.vols_len, ~0))
+		 return FALSE;
 	return TRUE;
 }
 
@@ -85,12 +87,12 @@ xdr_gd1_mgmt_friend_rsp (XDR *xdrs, gd1_mgmt_friend_rsp *objp)
 		 return FALSE;
 	 if (!xdr_string (xdrs, &objp->hostname, ~0))
 		 return FALSE;
-	 if (!xdr_int (xdrs, &objp->port))
-		 return FALSE;
 	 if (!xdr_int (xdrs, &objp->op_ret))
 		 return FALSE;
 	 if (!xdr_int (xdrs, &objp->op_errno))
 		 return FALSE;
+	 if (!xdr_int (xdrs, &objp->port))
+		 return FALSE;
 	return TRUE;
 }
 
@@ -117,12 +119,12 @@ xdr_gd1_mgmt_unfriend_rsp (XDR *xdrs, gd1_mgmt_unfriend_rsp *objp)
 		 return FALSE;
 	 if (!xdr_string (xdrs, &objp->hostname, ~0))
 		 return FALSE;
-	 if (!xdr_int (xdrs, &objp->port))
-		 return FALSE;
 	 if (!xdr_int (xdrs, &objp->op_ret))
 		 return FALSE;
 	 if (!xdr_int (xdrs, &objp->op_errno))
 		 return FALSE;
+	 if (!xdr_int (xdrs, &objp->port))
+		 return FALSE;
 	return TRUE;
 }
 
diff --git a/rpc/xdr/src/glusterd1-xdr.h b/rpc/xdr/src/glusterd1-xdr.h
index 4125d7b1259..7b208ee5f11 100644
--- a/rpc/xdr/src/glusterd1-xdr.h
+++ b/rpc/xdr/src/glusterd1-xdr.h
@@ -26,7 +26,7 @@
 #ifndef _GLUSTERD1_H_RPCGEN
 #define _GLUSTERD1_H_RPCGEN
 
-//#include <rpc/rpc.h>
+#include <rpc/rpc.h>
 
 
 #ifdef __cplusplus
@@ -44,46 +44,50 @@ typedef enum glusterd_volume_status glusterd_volume_status;
 struct gd1_mgmt_probe_req {
 	u_char uuid[16];
 	char *hostname;
-        int port;
+	int port;
 };
 typedef struct gd1_mgmt_probe_req gd1_mgmt_probe_req;
 
 struct gd1_mgmt_probe_rsp {
 	u_char uuid[16];
 	char *hostname;
-        int port;
+	int port;
 };
 typedef struct gd1_mgmt_probe_rsp gd1_mgmt_probe_rsp;
 
 struct gd1_mgmt_friend_req {
 	u_char uuid[16];
 	char *hostname;
-        int port;
+	int port;
+	struct {
+		u_int vols_len;
+		char *vols_val;
+	} vols;
 };
 typedef struct gd1_mgmt_friend_req gd1_mgmt_friend_req;
 
 struct gd1_mgmt_friend_rsp {
 	u_char uuid[16];
 	char *hostname;
-        int port;
 	int op_ret;
 	int op_errno;
+	int port;
 };
 typedef struct gd1_mgmt_friend_rsp gd1_mgmt_friend_rsp;
 
 struct gd1_mgmt_unfriend_req {
 	u_char uuid[16];
 	char *hostname;
-        int port;
+	int port;
 };
 typedef struct gd1_mgmt_unfriend_req gd1_mgmt_unfriend_req;
 
 struct gd1_mgmt_unfriend_rsp {
 	u_char uuid[16];
 	char *hostname;
-        int port;
 	int op_ret;
 	int op_errno;
+	int port;
 };
 typedef struct gd1_mgmt_unfriend_rsp gd1_mgmt_unfriend_rsp;
 
@@ -153,7 +157,7 @@ struct gd1_mgmt_friend_update {
 		u_int friends_len;
 		char *friends_val;
 	} friends;
-        int port;
+	int port;
 };
 typedef struct gd1_mgmt_friend_update gd1_mgmt_friend_update;
 
diff --git a/rpc/xdr/src/glusterd1.x b/rpc/xdr/src/glusterd1.x
index 28e6de01f82..19fa7af688b 100644
--- a/rpc/xdr/src/glusterd1.x
+++ b/rpc/xdr/src/glusterd1.x
@@ -7,16 +7,20 @@
  struct gd1_mgmt_probe_req {
         unsigned char  uuid[16];
         string  hostname<>;
+        int     port;
 }  ;
 
  struct gd1_mgmt_probe_rsp {
         unsigned char  uuid[16];
         string  hostname<>;
+        int     port;
 }  ;
 
 struct gd1_mgmt_friend_req {
         unsigned char  uuid[16];
         string  hostname<>;
+        int     port;
+        opaque  vols<>;
 }  ;
 
 struct gd1_mgmt_friend_rsp {
@@ -24,11 +28,13 @@ struct gd1_mgmt_friend_rsp {
         string  hostname<>;
         int     op_ret;
         int     op_errno;
+        int     port;
 }  ;
 
 struct gd1_mgmt_unfriend_req {
         unsigned char  uuid[16];
         string  hostname<>;
+        int     port;
 }  ;
 
 struct gd1_mgmt_unfriend_rsp {
@@ -36,6 +42,7 @@ struct gd1_mgmt_unfriend_rsp {
         string  hostname<>;
         int     op_ret;
         int     op_errno;
+        int     port;
 }  ;
 
 struct gd1_mgmt_cluster_lock_req {
@@ -89,6 +96,7 @@ struct gd1_mgmt_commit_op_rsp {
 struct gd1_mgmt_friend_update {
         unsigned char uuid[16];
         opaque  friends<>;
+        int     port;
 } ;
 
 struct gd1_mgmt_friend_update_rsp {
diff --git a/xlators/mgmt/glusterd/src/glusterd-handler.c b/xlators/mgmt/glusterd/src/glusterd-handler.c
index 7e9a82e306a..00162e913ea 100644
--- a/xlators/mgmt/glusterd/src/glusterd-handler.c
+++ b/xlators/mgmt/glusterd/src/glusterd-handler.c
@@ -119,7 +119,8 @@ glusterd_friend_find_by_uuid (uuid_t uuid,
 }
 
 static int
-glusterd_handle_friend_req (rpcsvc_request_t *req, uuid_t  uuid, char *hostname, int port)
+glusterd_handle_friend_req (rpcsvc_request_t *req, uuid_t  uuid,
+                            char *hostname, int port, dict_t *dict)
 {
         int                             ret = -1;
         glusterd_peerinfo_t             *peerinfo = NULL;
@@ -159,6 +160,7 @@ glusterd_handle_friend_req (rpcsvc_request_t *req, uuid_t  uuid, char *hostname,
         if (hostname)
                 ctx->hostname = gf_strdup (hostname);
         ctx->req = req;
+        ctx->vols = dict;
 
         event->ctx = ctx;
 
@@ -176,6 +178,8 @@ out:
         if (0 != ret) {
                 if (ctx && ctx->hostname)
                         GF_FREE (ctx->hostname);
+                if (ctx && ctx->vols)
+                        dict_destroy (ctx->vols);
                 if (ctx)
                         GF_FREE (ctx);
         }
@@ -742,7 +746,7 @@ out:
                 defrag->mount);
 
         snprintf (cmd_str, 1024, "umount %s", defrag->mount);
-        system (cmd_str);
+        ret = system (cmd_str);
         volinfo->defrag = NULL;
         LOCK_DESTROY (&defrag->lock);
         GF_FREE (defrag);
@@ -1291,7 +1295,8 @@ glusterd_handle_incoming_friend_req (rpcsvc_request_t *req)
 {
         int32_t                 ret = -1;
         gd1_mgmt_friend_req     friend_req = {{0},};
-        char                    str[50];
+        char                    str[50] = {0,};
+        dict_t                  *dict = NULL;
 
         GF_ASSERT (req);
         if (!gd_xdr_to_mgmt_friend_req (req->msg[0], &friend_req)) {
@@ -1304,8 +1309,22 @@ glusterd_handle_incoming_friend_req (rpcsvc_request_t *req)
         gf_log ("glusterd", GF_LOG_NORMAL,
                 "Received probe from uuid: %s", str);
 
+        dict = dict_new ();
+        if (!dict) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_unserialize (friend_req.vols.vols_val,
+                                friend_req.vols.vols_len,
+                                &dict);
+
+        if (ret)
+                goto out;
+
         ret = glusterd_handle_friend_req (req, friend_req.uuid,
-                                          friend_req.hostname, friend_req.port);
+                                          friend_req.hostname, friend_req.port,
+                                          dict);
 
 out:
 
@@ -1728,7 +1747,8 @@ glusterd_xfer_friend_remove_resp (rpcsvc_request_t *req, char *hostname, int por
 }
 
 int
-glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname, int port)
+glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname, int port,
+                               int32_t op_ret)
 {
         gd1_mgmt_friend_rsp  rsp = {{0}, };
         int32_t              ret = -1;
@@ -1737,7 +1757,7 @@ glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname, int port)
 
         GF_ASSERT (hostname);
 
-        rsp.op_ret = 0;
+        rsp.op_ret = op_ret;
         this = THIS;
         GF_ASSERT (this);
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-op-sm.c b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
index b243e78951b..3b4b390d144 100644
--- a/xlators/mgmt/glusterd/src/glusterd-op-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
@@ -253,7 +253,7 @@ out:
         return ret;
 }
 
-static int
+int
 glusterd_volume_create_generate_volfiles (glusterd_volinfo_t *volinfo)
 {
         int32_t         ret = -1;
@@ -800,6 +800,7 @@ glusterd_op_create_volume (gd1_mgmt_stage_op_req *req)
                 i++;
         }
         list_add_tail (&volinfo->vol_list, &priv->volumes);
+        volinfo->version++;
 
         ret = glusterd_store_create_volume (volinfo);
 
@@ -811,6 +812,10 @@ glusterd_op_create_volume (gd1_mgmt_stage_op_req *req)
                 goto out;
 
 
+        ret = glusterd_volume_compute_cksum (volinfo);
+        if (ret)
+                goto out;
+
 out:
         return ret;
 }
@@ -942,6 +947,12 @@ glusterd_op_add_brick (gd1_mgmt_stage_op_req *req)
                         goto out;
         }
 
+        volinfo->version++;
+
+        ret = glusterd_volume_compute_cksum (volinfo);
+        if (ret)
+                goto out;
+
         ret = glusterd_store_update_volume (volinfo);
 
         if (ret)
@@ -1879,6 +1890,12 @@ glusterd_op_remove_brick (gd1_mgmt_stage_op_req *req)
                         goto out;
         }
 
+        volinfo->version++;
+
+        ret = glusterd_volume_compute_cksum (volinfo);
+        if (ret)
+                goto out;
+
         ret = glusterd_store_update_volume (volinfo);
 
         if (ret)
diff --git a/xlators/mgmt/glusterd/src/glusterd-sm.c b/xlators/mgmt/glusterd/src/glusterd-sm.c
index 18b0b1aa5eb..c12a11a8fb2 100644
--- a/xlators/mgmt/glusterd/src/glusterd-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-sm.c
@@ -306,6 +306,7 @@ glusterd_ac_handle_friend_add_req (glusterd_friend_sm_event_t *event, void *ctx)
         glusterd_friend_sm_event_t      *new_event = NULL;
         glusterd_friend_sm_event_type_t event_type = GD_FRIEND_EVENT_NONE;
         int                             status = 0;
+        int32_t                         op_ret = -1;
 
         GF_ASSERT (ctx);
         ev_ctx = ctx;
@@ -315,11 +316,18 @@ glusterd_ac_handle_friend_add_req (glusterd_friend_sm_event_t *event, void *ctx)
         uuid_copy (peerinfo->uuid, ev_ctx->uuid);
 
         //Build comparison logic here.
+        ret = glusterd_compare_friend_data (ev_ctx->vols, &status);
+        if (ret)
+                goto out;
 
-        if (!status)
+        if (GLUSTERD_VOL_COMP_RJT != status) {
                 event_type = GD_FRIEND_EVENT_LOCAL_ACC;
-        else
+                op_ret = 0;
+        }
+        else {
                 event_type = GD_FRIEND_EVENT_LOCAL_RJT;
+                op_ret = -1;
+        }
 
         ret = glusterd_friend_sm_new_event (event_type, &new_event);
 
@@ -344,7 +352,7 @@ glusterd_ac_handle_friend_add_req (glusterd_friend_sm_event_t *event, void *ctx)
         glusterd_friend_sm_inject_event (new_event);
 
         ret = glusterd_xfer_friend_add_resp (ev_ctx->req, ev_ctx->hostname,
-                                             ev_ctx->port);
+                                             ev_ctx->port, op_ret);
 
 out:
         gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
@@ -408,7 +416,7 @@ glusterd_sm_t  glusterd_state_req_rcvd [] = {
         {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCVD_ACC
         {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC
         {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCVD_RJT
-        {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT
+        {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT
         {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCV_FRIEND_REQ
         {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND,
         {GD_FRIEND_STATE_DEFAULT, glusterd_ac_handle_friend_remove_req}, //EVENT_RCVD_REMOVE_FRIEND
diff --git a/xlators/mgmt/glusterd/src/glusterd-sm.h b/xlators/mgmt/glusterd/src/glusterd-sm.h
index 65cf6dc8905..6490f3d526d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-sm.h
+++ b/xlators/mgmt/glusterd/src/glusterd-sm.h
@@ -124,6 +124,7 @@ typedef struct glusterd_friend_req_ctx_ {
         char                    *hostname;
         rpcsvc_request_t        *req;
         int                      port;
+        dict_t                  *vols;
 } glusterd_friend_req_ctx_t;
 
 typedef glusterd_friend_req_ctx_t glusterd_friend_update_ctx_t;
diff --git a/xlators/mgmt/glusterd/src/glusterd-store.c b/xlators/mgmt/glusterd/src/glusterd-store.c
index 2cee89516db..ee47696da96 100644
--- a/xlators/mgmt/glusterd/src/glusterd-store.c
+++ b/xlators/mgmt/glusterd/src/glusterd-store.c
@@ -134,9 +134,9 @@ glusterd_store_create_brick (glusterd_volinfo_t *volinfo,
 
 
         snprintf (buf, sizeof(buf), "hostname=%s\n", brickinfo->hostname);
-        write (fd, buf, strlen(buf));
+        ret = write (fd, buf, strlen(buf));
         snprintf (buf, sizeof(buf), "path=%s\n", brickinfo->path);
-        write (fd, buf, strlen(buf));
+        ret = write (fd, buf, strlen(buf));
 
         ret = 0;
 
@@ -293,18 +293,24 @@ glusterd_store_create_volume (glusterd_volinfo_t *volinfo)
         if (ret)
                 goto out;
 
-        snprintf (buf, sizeof (buf), "%d", volinfo->status);
+/*        snprintf (buf, sizeof (buf), "%d", volinfo->port);
         ret = glusterd_store_save_value (volinfo->shandle,
                                         GLUSTERD_STORE_KEY_VOL_PORT, buf);
         if (ret)
                 goto out;
-
+*/
         snprintf (buf, sizeof (buf), "%d", volinfo->sub_count);
         ret = glusterd_store_save_value (volinfo->shandle,
                                         GLUSTERD_STORE_KEY_VOL_SUB_COUNT, buf);
         if (ret)
                 goto out;
 
+        snprintf (buf, sizeof (buf), "%d", volinfo->version);
+        ret = glusterd_store_save_value (volinfo->shandle,
+                                        GLUSTERD_STORE_KEY_VOL_VERSION, buf);
+        if (ret)
+                goto out;
+
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 ret = glusterd_store_create_brick (volinfo, brickinfo);
                 if (ret)
@@ -328,7 +334,7 @@ int32_t
 glusterd_store_delete_volume (glusterd_volinfo_t *volinfo)
 {
         char    pathname[PATH_MAX] = {0,};
-        int32_t ret = -1;
+        int32_t ret = 0;
         glusterd_conf_t *priv = NULL;
         DIR     *dir = NULL;
         struct dirent *entry = NULL;
diff --git a/xlators/mgmt/glusterd/src/glusterd-store.h b/xlators/mgmt/glusterd/src/glusterd-store.h
index 1889e5f58bd..10fb4a3af01 100644
--- a/xlators/mgmt/glusterd/src/glusterd-store.h
+++ b/xlators/mgmt/glusterd/src/glusterd-store.h
@@ -46,6 +46,7 @@
 #define GLUSTERD_STORE_KEY_VOL_PORT   "port"
 #define GLUSTERD_STORE_KEY_VOL_SUB_COUNT   "sub_count"
 #define GLUSTERD_STORE_KEY_VOL_BRICK  "brick"
+#define GLUSTERD_STORE_KEY_VOL_VERSION  "version"
 
 #define GLUSTERD_STORE_KEY_BRICK_HOSTNAME "hostname"
 #define GLUSTERD_STORE_KEY_BRICK_PATH "path"
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 35dfa3dfba3..f0115c05b19 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -927,3 +927,491 @@ glusterd_is_cli_op_req (int32_t op)
 
         return _gf_false;
 }
+
+
+int
+glusterd_volume_compute_cksum (glusterd_volinfo_t  *volinfo)
+{
+        int32_t                 ret = -1;
+        glusterd_conf_t         *priv = NULL;
+        char                    path[PATH_MAX] = {0,};
+        char                    cksum_path[PATH_MAX] = {0,};
+        char                    filepath[PATH_MAX] = {0,};
+        DIR                     *dir = NULL;
+        struct dirent           *entry = NULL;
+        int                     fd = -1;
+        uint32_t                cksum = 0;
+        char                    buf[4096] = {0,};
+
+        GF_ASSERT (volinfo);
+
+        priv = THIS->private;
+        GF_ASSERT (priv);
+
+        GLUSTERD_GET_VOLUME_DIR (path, volinfo, priv);
+
+        snprintf (cksum_path, sizeof (cksum_path), "%s/%s",
+                  path, GLUSTERD_CKSUM_FILE);
+
+        fd = open (cksum_path, O_RDWR | O_APPEND | O_CREAT, 0644);
+
+        if (-1 == fd) {
+                gf_log ("", GF_LOG_ERROR, "Unable to open %s, errno: %d",
+                        cksum_path, errno);
+                ret = -1;
+                goto out;
+        }
+
+
+        dir = opendir (path);
+
+        glusterd_for_each_entry (entry, dir);
+
+/*        while (entry) {
+
+                snprintf (filepath, sizeof (filepath), "%s/%s", path,
+                          entry->d_name);
+
+                if (!strcmp (entry->d_name, "bricks") ||
+                     !strcmp (entry->d_name, "run")) {
+                        glusterd_for_each_entry (entry, dir);
+                        continue;
+                }
+
+                ret = get_checksum_for_path (filepath, &cksum);
+
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to get checksum"
+                                " for path: %s", filepath);
+                        goto out;
+                }
+
+                snprintf (buf, sizeof (buf), "%s=%u\n", entry->d_name, cksum);
+                ret = write (fd, buf, strlen (buf));
+
+                if (ret <= 0) {
+                        ret = -1;
+                        goto out;
+                }
+
+                glusterd_for_each_entry (entry, dir);
+        }
+*/
+
+        snprintf (filepath, sizeof (filepath), "%s/%s", path,
+                  GLUSTERD_VOLUME_INFO_FILE);
+
+        ret = get_checksum_for_path (filepath, &cksum);
+
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get checksum"
+                        " for path: %s", filepath);
+                goto out;
+        }
+
+        snprintf (buf, sizeof (buf), "%s=%u\n", "info", cksum);
+        ret = write (fd, buf, strlen (buf));
+
+        if (ret <= 0) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = get_checksum_for_file (fd, &cksum);
+
+        if (ret)
+                goto out;
+
+       volinfo->cksum = cksum;
+
+out:
+       if (fd > 0)
+               close (fd);
+
+       if (dir)
+               closedir (dir);
+
+       gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+
+       return ret;
+}
+
+int32_t
+glusterd_add_volume_to_dict (glusterd_volinfo_t *volinfo,
+                             dict_t  *dict, int32_t count)
+{
+        int32_t                 ret = -1;
+        char                    key[512] = {0,};
+        glusterd_brickinfo_t    *brickinfo = NULL;
+        int32_t                 i = 1;
+
+        GF_ASSERT (dict);
+        GF_ASSERT (volinfo);
+
+        snprintf (key, sizeof (key), "volume%d.name", count);
+        ret = dict_set_str (dict, key, volinfo->volname);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.type", count);
+        ret = dict_set_int32 (dict, key, volinfo->type);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.brick_count", count);
+        ret = dict_set_int32 (dict, key, volinfo->brick_count);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.version", count);
+        ret = dict_set_int32 (dict, key, volinfo->version);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.status", count);
+        ret = dict_set_int32 (dict, key, volinfo->status);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.sub_count", count);
+        ret = dict_set_int32 (dict, key, volinfo->sub_count);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.ckusm", count);
+        ret = dict_set_int64 (dict, key, volinfo->cksum);
+        if (ret)
+                goto out;
+
+        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                memset (&key, 0, sizeof (key));
+                snprintf (key, sizeof (key), "volume%d.brick%d.hostname",
+                          count, i);
+                ret = dict_set_str (dict, key, brickinfo->hostname);
+                if (ret)
+                        goto out;
+
+                memset (&key, 0, sizeof (key));
+                snprintf (key, sizeof (key), "volume%d.brick%d.path",
+                          count, i);
+                ret = dict_set_str (dict, key, brickinfo->path);
+                if (ret)
+                        goto out;
+
+                i++;
+        }
+
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+
+        return ret;
+}
+
+int32_t
+glusterd_build_volume_dict (dict_t **vols)
+{
+        int32_t                 ret = -1;
+        dict_t                  *dict = NULL;
+        glusterd_conf_t         *priv = NULL;
+        glusterd_volinfo_t      *volinfo = NULL;
+        int32_t                 count = 0;
+
+        priv = THIS->private;
+
+        dict = dict_new ();
+
+        if (!dict)
+                goto out;
+
+        list_for_each_entry (volinfo, &priv->volumes, vol_list) {
+                count++;
+                ret = glusterd_add_volume_to_dict (volinfo, dict, count);
+                if (ret)
+                        goto out;
+        }
+
+
+        ret = dict_set_int32 (dict, "count", count);
+        if (ret)
+                goto out;
+
+        *vols = dict;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+        if (ret)
+                dict_destroy (dict);
+
+        return ret;
+}
+
+int32_t
+glusterd_compare_friend_volume (dict_t *vols, int32_t count, int32_t *status)
+{
+
+        int32_t                 ret = -1;
+        char                    key[512] = {0,};
+        glusterd_volinfo_t      *volinfo = NULL;
+        char                    *volname = NULL;
+        uint32_t                cksum = 0;
+        int32_t                 version = 0;
+
+        GF_ASSERT (vols);
+        GF_ASSERT (status);
+
+        snprintf (key, sizeof (key), "volume%d.name", count);
+        ret = dict_get_str (vols, key, &volname);
+        if (ret)
+                goto out;
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+
+        if (ret) {
+                *status = GLUSTERD_VOL_COMP_UPDATE_REQ;
+                ret = 0;
+                goto out;
+        }
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.version", count);
+        ret = dict_get_int32 (vols, key, &version);
+        if (ret)
+                goto out;
+
+        if (version != volinfo->version) {
+                //Mismatch detected
+                ret = 0;
+                gf_log ("", GF_LOG_ERROR, "Version of volume %s differ."
+                        "local version = %d, remote version = %d",
+                        volinfo->volname, volinfo->version, version);
+                *status = GLUSTERD_VOL_COMP_UPDATE_REQ;
+                goto out;
+        }
+
+        //Now, versions are same, compare cksums.
+        //
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.ckusm", count);
+        ret = dict_get_uint32 (vols, key, &cksum);
+        if (ret)
+                goto out;
+
+        if (cksum != volinfo->cksum) {
+                ret = 0;
+                gf_log ("", GF_LOG_ERROR, "Cksums of volume %s differ."
+                        " local cksum = %d, remote cksum = %d",
+                        volinfo->volname, volinfo->cksum, cksum);
+                *status = GLUSTERD_VOL_COMP_RJT;
+                goto out;
+        }
+
+        *status = GLUSTERD_VOL_COMP_SCS;
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning with ret: %d, status: %d",
+                ret, *status);
+        return ret;
+}
+
+int32_t
+glusterd_import_friend_volume (dict_t *vols, int count)
+{
+
+        int32_t                 ret = -1;
+        glusterd_conf_t         *priv = NULL;
+        char                    key[512] = {0,};
+        glusterd_volinfo_t      *volinfo = NULL;
+        char                    *volname = NULL;
+        char                    *hostname = NULL;
+        char                    *path = NULL;
+        glusterd_brickinfo_t    *brickinfo = NULL;
+        glusterd_brickinfo_t    *tmp = NULL;
+        int                     new_volinfo = 0;
+        int                     i = 1;
+
+        GF_ASSERT (vols);
+
+        snprintf (key, sizeof (key), "volume%d.name", count);
+        ret = dict_get_str (vols, key, &volname);
+        if (ret)
+                goto out;
+
+        priv = THIS->private;
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+
+        if (ret) {
+                ret = glusterd_volinfo_new (&volinfo);
+                if (ret)
+                        goto out;
+                strncpy (volinfo->volname, volname, sizeof (volinfo->volname));
+                new_volinfo = 1;
+        }
+
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.type", count);
+        ret = dict_get_int32 (vols, key, &volinfo->type);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.brick_count", count);
+        ret = dict_get_int32 (vols, key, &volinfo->brick_count);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.version", count);
+        ret = dict_get_int32 (vols, key, &volinfo->version);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.status", count);
+        ret = dict_get_int32 (vols, key, (int32_t *)&volinfo->status);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.sub_count", count);
+        ret = dict_get_int32 (vols, key, &volinfo->sub_count);
+        if (ret)
+                goto out;
+
+        memset (&key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.ckusm", count);
+        ret = dict_get_uint32 (vols, key, &volinfo->cksum);
+        if (ret)
+                goto out;
+
+        list_for_each_entry_safe (brickinfo, tmp, &volinfo->bricks,
+                                   brick_list) {
+                ret = glusterd_brickinfo_delete (brickinfo);
+                if (ret)
+                        goto out;
+        }
+
+        while (i <= volinfo->brick_count) {
+
+                memset (&key, 0, sizeof (key));
+                snprintf (key, sizeof (key), "volume%d.brick%d.hostname",
+                          count, i);
+                ret = dict_get_str (vols, key, &hostname);
+                if (ret)
+                        goto out;
+
+                memset (&key, 0, sizeof (key));
+                snprintf (key, sizeof (key), "volume%d.brick%d.path",
+                          count, i);
+                ret = dict_get_str (vols, key, &path);
+                if (ret)
+                        goto out;
+
+                ret = glusterd_brickinfo_new (&brickinfo);
+                if (ret)
+                        goto out;
+
+                strcpy (brickinfo->path, path);
+                strcpy (brickinfo->hostname, hostname);
+
+                list_add_tail (&brickinfo->brick_list, &volinfo->bricks);
+
+                i++;
+        }
+
+        if (new_volinfo) {
+                list_add_tail (&volinfo->vol_list, &priv->volumes);
+                ret = glusterd_store_create_volume (volinfo);
+        } else {
+                ret = glusterd_store_update_volume (volinfo);
+        }
+
+        ret = glusterd_volume_create_generate_volfiles (volinfo);
+        if (ret)
+                goto out;
+
+        //volinfo->version++;
+
+        ret = glusterd_volume_compute_cksum (volinfo);
+        if (ret)
+                goto out;
+
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning with ret: %d", ret);
+        return ret;
+}
+
+
+int32_t
+glusterd_import_friend_volumes (dict_t  *vols)
+{
+        int32_t                 ret = -1;
+        int32_t                 count = 0;
+        int                     i = 1;
+
+        GF_ASSERT (vols);
+
+        ret = dict_get_int32 (vols, "count", &count);
+        if (ret)
+                goto out;
+
+        while (i <= count) {
+                ret = glusterd_import_friend_volume (vols, i);
+                if (ret)
+                        goto out;
+
+                i++;
+        }
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_compare_friend_data (dict_t  *vols, int32_t *status)
+{
+        int32_t                 ret = -1;
+        int32_t                 count = 0;
+        int                     i = 1;
+
+        GF_ASSERT (vols);
+        GF_ASSERT (status);
+
+        ret = dict_get_int32 (vols, "count", &count);
+        if (ret)
+                goto out;
+
+        while (i <= count) {
+                ret = glusterd_compare_friend_volume (vols, i, status);
+                if (ret)
+                        goto out;
+
+                if (GLUSTERD_VOL_COMP_RJT == *status) {
+                        ret = 0;
+                        goto out;
+                }
+
+                i++;
+        }
+
+        if (GLUSTERD_VOL_COMP_UPDATE_REQ == *status) {
+                ret = glusterd_import_friend_volumes (vols);
+                if (ret)
+                        goto out;
+        }
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning with ret: %d, status: %d",
+                ret, *status);
+
+        return ret;
+}
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 892533c40a6..1e9469ce0fd 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -117,4 +117,16 @@ glusterd_brickinfo_get (char *brick, glusterd_volinfo_t *volinfo,
                         glusterd_brickinfo_t **brickinfo);
 int32_t
 glusterd_is_local_addr (char *hostname);
+
+int32_t
+glusterd_build_volume_dict (dict_t **vols);
+
+int32_t
+glusterd_compare_friend_data (dict_t  *vols, int32_t *status);
+
+int
+glusterd_volume_compute_cksum (glusterd_volinfo_t  *volinfo);
+
+int
+glusterd_volume_create_generate_volfiles (glusterd_volinfo_t *volinfo);
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd.h b/xlators/mgmt/glusterd/src/glusterd.h
index cc1fb7786bd..4465ee316dd 100644
--- a/xlators/mgmt/glusterd/src/glusterd.h
+++ b/xlators/mgmt/glusterd/src/glusterd.h
@@ -127,6 +127,9 @@ struct glusterd_volinfo_ {
         uint64_t                rebalance_data;
         uint64_t                lookedup_files;
         glusterd_defrag_info_t  *defrag;
+
+        int                     version;
+        uint32_t                cksum;
 };
 
 typedef struct glusterd_volinfo_ glusterd_volinfo_t;
@@ -135,6 +138,13 @@ enum glusterd_op_ret {
         GLUSTERD_CONNECTION_AWAITED = 100,
 };
 
+enum glusterd_vol_comp_status_ {
+        GLUSTERD_VOL_COMP_NONE = 0,
+        GLUSTERD_VOL_COMP_SCS = 1,
+        GLUSTERD_VOL_COMP_UPDATE_REQ,
+        GLUSTERD_VOL_COMP_RJT,
+};
+
 #define GLUSTERD_DEFAULT_WORKDIR "/etc/glusterd"
 #define GLUSTERD_DEFAULT_PORT   6969
 #define GLUSTERD_INFO_FILE      "glusterd.info"
@@ -142,6 +152,7 @@ enum glusterd_op_ret {
 #define GLUSTERD_PEER_DIR_PREFIX "peers"
 #define GLUSTERD_VOLUME_INFO_FILE "info"
 #define GLUSTERD_BRICK_INFO_DIR "bricks"
+#define GLUSTERD_CKSUM_FILE "cksum"
 
 /*All definitions related to replace brick */
 #define RB_PUMP_START_CMD       "trusted.glusterfs.pump.start"
@@ -173,7 +184,8 @@ int
 glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port);
 
 int
-glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname, int port);
+glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname,
+                               int port, int32_t op_ret);
 
 int
 glusterd_friend_find (uuid_t uuid, char *hostname,
diff --git a/xlators/mgmt/glusterd/src/glusterd3_1-mops.c b/xlators/mgmt/glusterd/src/glusterd3_1-mops.c
index 2c5cb8f33ab..5196055b3e1 100644
--- a/xlators/mgmt/glusterd/src/glusterd3_1-mops.c
+++ b/xlators/mgmt/glusterd/src/glusterd3_1-mops.c
@@ -639,6 +639,7 @@ glusterd3_1_friend_add (call_frame_t *frame, xlator_t *this,
         glusterd_conf_t         *priv = NULL;
         glusterd_friend_sm_event_t     *event = NULL;
         glusterd_friend_req_ctx_t *ctx = NULL;
+        dict_t                  *vols = NULL;
 
 
         if (!frame || !this || !data) {
@@ -655,15 +656,32 @@ glusterd3_1_friend_add (call_frame_t *frame, xlator_t *this,
 
         peerinfo = event->peerinfo;
 
+        ret = glusterd_build_volume_dict (&vols);
+        if (ret)
+                goto out;
+
         uuid_copy (req.uuid, priv->uuid);
         req.hostname = gf_strdup (peerinfo->hostname);
         req.port = peerinfo->port;
+
+        ret = dict_allocate_and_serialize (vols, &req.vols.vols_val,
+                                           (size_t *)&req.vols.vols_len);
+        if (ret)
+                goto out;
+
         ret = glusterd_submit_request (peerinfo, &req, frame, priv->mgmt,
                                        GD_MGMT_FRIEND_ADD,
                                        NULL, gd_xdr_from_mgmt_friend_req,
                                        this, glusterd3_1_friend_add_cbk);
 
+
 out:
+        if (req.vols.vols_val)
+                GF_FREE (req.vols.vols_val);
+
+        if (vols)
+                dict_destroy (vols);
+
         gf_log ("glusterd", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }