Created
July 7, 2016 10:57
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#define _GNU_SOURCE | |
#define _FILE_OFFSET_BITS 64 | |
#include <unistd.h> | |
#include <linux/falloc.h> | |
#include <fcntl.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <sys/stat.h> | |
#include <errno.h> | |
static void usage(int argc, char **argv) | |
{ | |
(void)argc; | |
printf("Usage: %s <Path>\n", argv[0]); | |
exit(EXIT_FAILURE); | |
} | |
int main(int argc, char **argv) | |
{ | |
int fd, ret; | |
off_t i, blk; | |
const int blk_size = 4096; | |
struct stat file_stat; | |
if (argc != 2) | |
usage(argc, argv); | |
fd = open(argv[1], O_RDWR); | |
if (fd < 0) { | |
perror("open"); | |
return EXIT_FAILURE; | |
} | |
ret = fstat(fd, &file_stat); | |
if (ret < 0) { | |
perror("stat"); | |
close(fd); | |
return EXIT_FAILURE; | |
} | |
blk = (file_stat.st_size + blk_size - 1) / blk_size; | |
for (i = 0; i < blk; i += 10) { | |
printf("i: %llu\n", i); | |
ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, i * blk_size, blk_size * 6); | |
if (ret < 0) { | |
perror("fallcate"); | |
close(fd); | |
return EXIT_FAILURE; | |
} | |
} | |
fsync(fd); | |
close(fd); | |
return EXIT_SUCCESS; | |
} |
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