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dd if=/dev/zero of=1T.img bs=1G seek=1024 count=0
bs=1G±íʾÿһ´Î¶Áд1GÊý¾Ý£¬count=0±íʾ¶Áд0´Î£¬seek=1024±íʾÂÔ¹ý1024¸öBlock²»Ð´£¬Ç°Ãæblock sizeÊÇ1G£¬ËùÒÔ¹²ÂÔ¹ý1T£¡
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¶þ.ftruncate64/ftruncate
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Îļþsparse.c:
//OPTION 1:ÊÇ·ñ¶¨ÒåÓë´óÎļþÏà¹ØµÄºê
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#define FILENAME "bigfile"
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
int main(int argc, char **argv)
{
int fd, ret;
off_t offset;
int total = 0;
if ( argc >= 2 )
{
total = atol(argv[1]);
printf("total=%d\n", total);
}
//OPTION 2:ÊÇ·ñÓÐO_LARGEFILEÑ¡Ïî
//fd = open(FILENAME, O_RDWR|O_CREAT|O_LARGEFILE, 0644);
fd = open(FILENAME, O_RDWR|O_CREAT, 0644);
if (fd < 0) {
perror(FILENAME);
return -1;
}
offset = (off_t)total *1024ll*1024ll*1024ll;
printf("offset=%ld\n", offset);
//OPTION 3£ºÊÇ·ñµ÷ÓÃ64λϵͳº¯Êý
//if (ftruncate64(fd, offset) < 0)
if (ftruncate(fd, offset) < 0)
{
printf("[%d]-ftruncate64 error: %s\n", errno, strerror(errno));
close(fd);
return 0;
}
close(fd);
printf("OK\n");
return 0;
}
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linux:/disk/test/big # gcc --version
gcc (GCC) 3.3.5 20050117 (prerelease) (SUSE Linux)
linux:/disk/test/big # uname -a
Linux linux 2.6.11.4-20a-default #1 Wed Mar 23 21:52:37 UTC 2005 i686 i686 i386 GNU/Linux
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pid_t pid=fork()
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