int init_cluster_locking(struct locking_type *locking, struct cmd_context *cmd,
			 int suppress_messages)
{
	locking->lock_resource = _lock_resource;
	locking->query_resource = _query_resource;
	locking->fin_locking = _locking_end;
	locking->reset_locking = _reset_locking;
	locking->flags = LCK_PRE_MEMLOCK | LCK_CLUSTERED;

	_clvmd_sock = _open_local_sock(suppress_messages);
	if (_clvmd_sock == -1)
		return 0;

	return 1;
}
Example #2
0
/*
 * Send a message to a(or all) node(s) in the cluster and wait for replies
 */
static int _cluster_request(char cmd, const char *node, void *data, int len,
			   lvm_response_t ** response, int *num)
{
	char outbuf[sizeof(struct clvm_header) + len + strlen(node) + 1];
	char *inptr;
	char *retbuf = NULL;
	int status;
	int i;
	int num_responses = 0;
	struct clvm_header *head = (struct clvm_header *) outbuf;
	lvm_response_t *rarray;

	*num = 0;

	if (_clvmd_sock == -1)
		_clvmd_sock = _open_local_sock();

	if (_clvmd_sock == -1)
		return 0;

	_build_header(head, cmd, node, len);
	memcpy(head->node + strlen(head->node) + 1, data, len);

	status = _send_request(outbuf, sizeof(struct clvm_header) +
			      strlen(head->node) + len, &retbuf);
	if (!status)
		goto out;

	/* Count the number of responses we got */
	head = (struct clvm_header *) retbuf;
	inptr = head->args;
	while (inptr[0]) {
		num_responses++;
		inptr += strlen(inptr) + 1;
		inptr += sizeof(int);
		inptr += strlen(inptr) + 1;
	}

	/*
	 * Allocate response array.
	 * With an extra pair of INTs on the front to sanity
	 * check the pointer when we are given it back to free
	 */
	*response = dm_malloc(sizeof(lvm_response_t) * num_responses +
			    sizeof(int) * 2);
	if (!*response) {
		errno = ENOMEM;
		status = 0;
		goto out;
	}

	rarray = *response;

	/* Unpack the response into an lvm_response_t array */
	inptr = head->args;
	i = 0;
	while (inptr[0]) {
		strcpy(rarray[i].node, inptr);
		inptr += strlen(inptr) + 1;

		memcpy(&rarray[i].status, inptr, sizeof(int));
		inptr += sizeof(int);

		rarray[i].response = dm_malloc(strlen(inptr) + 1);
		if (rarray[i].response == NULL) {
			/* Free up everything else and return error */
			int j;
			for (j = 0; j < i; j++)
				dm_free(rarray[i].response);
			free(*response);
			errno = ENOMEM;
			status = -1;
			goto out;
		}

		strcpy(rarray[i].response, inptr);
		rarray[i].len = strlen(inptr);
		inptr += strlen(inptr) + 1;
		i++;
	}
	*num = num_responses;
	*response = rarray;

      out:
	if (retbuf)
		dm_free(retbuf);

	return status;
}