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sfex_init.c
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/*-------------------------------------------------------------------------
*
* Shared Disk File EXclusiveness Control Program(SF-EX)
*
* sfex_init.c --- Initialize SF-EX meta-data.
*
* 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
*
* $Id$
*
*-------------------------------------------------------------------------
*
* sfex_init [-b <blocksize>] [-n <numlocks>] <device>
*
* -b <blocksize> --- The size of the block is specified by the number of
* bytes. In general, to prevent a partial writing to the disk, the size
* of block is set to 512 bytes etc.
* Note a set value because this value is used also for the alignment
* adjustment in the input-output buffer in the program when direct I/O
* is used(When you specify --enable-directio option for configure script).
* (In Linux kernel 2.6, "direct I/O " does not work if this value is not
* a multiple of 512.) Default is 512 bytes.
*
* -n <numlocks> --- The number of storing lock data is specified by integer
* of one or more. When you want to control two or more resources by one
* meta-data, you set the value of two or more to numlocks. A necessary disk
* area for meta data are (blocksize*(1+numlocks))bytes. Default is 1.
*
* <device> --- This is file path which stored meta-data. It is usually
* expressed in "/dev/...", because it is partition on the shared disk.
*
* exit code --- 0 - Normal end. 3 - Error occurs while processing it.
* The content of the error is displayed into stderr. 4 - The mistake is
* found in the command line parameter.
*
*-------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include "sfex.h"
#include "sfex_lib.h"
const char *progname;
char *nodename;
/*
* usage --- display command line syntax
*
* display command line syntax. By the purpose, it can specify destination
* stream. stdout or stderr is set usually.
*
* dist --- destination stream of the command line syntax, such as stderr.
*
* return value --- void
*/
static void usage(FILE *dist) {
fprintf(dist, "usage: %s [-n <numlocks>] <device>\n", progname);
}
/*
* main --- main function
*
* entry point of sfex_init command.
*
* exit code --- 0 - Normal end. 3 - Error occurs while processing it.
* The content of the error is displayed into stderr. 4 - The mistake is
* found in the command line parameter.
*/
int
main(int argc, char *argv[]) {
sfex_controldata cdata;
sfex_lockdata ldata;
/* command line parameter */
int numlocks = 1; /* default 1 locks */
const char *device;
/*
* startup process
*/
/* get a program name */
progname = get_progname(argv[0]);
/* enable the cl_log output from the sfex library */
cl_log_set_entity(progname);
/* The cl_log is output only to the standard error output */
cl_log_enable_stderr(TRUE);
/* read command line option */
opterr = 0;
while (1) {
int c = getopt(argc, argv, "hn:");
if (c == -1)
break;
switch (c) {
case 'h': /* help */
usage(stdout);
exit(0);
case 'n': /* -n <numlocks> */
{
unsigned long l = strtoul(optarg, NULL, 10);
if (l < SFEX_MIN_NUMLOCKS || l > SFEX_MAX_NUMLOCKS) {
fprintf(stderr,
"%s: ERROR: numlocks %s is out of range or invalid. it must be integer value between %lu and %lu.\n",
progname, optarg,
(unsigned long)SFEX_MIN_NUMLOCKS,
(unsigned long)SFEX_MAX_NUMLOCKS);
exit(4);
}
numlocks = l;
}
break;
case '?': /* error */
usage(stderr);
exit(4);
}
}
/* check parameter except the option */
if (optind >= argc) {
fprintf(stderr, "%s: ERROR: no device specified.\n", progname);
usage(stderr);
exit(4);
} else if (optind + 1 < argc) {
fprintf(stderr, "%s: ERROR: too many arguments.\n", progname);
usage(stderr);
exit(4);
}
device = argv[optind];
prepare_lock(device);
/* main processes start */
/* get a node name */
nodename = get_nodename();
/* create and control data and lock data */
init_controldata(&cdata, sector_size, numlocks);
init_lockdata(&ldata);
/* write out control data and lock data */
write_controldata(&cdata);
{
int index;
for (index = 1; index <= numlocks; index++)
if (write_lockdata(&cdata, &ldata, index) == -1) {
fprintf(stderr, "%s: ERROR: cannot write lock data (index=%d).\n",
progname, index);
exit(3);
}
}
exit(0);
}

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