used for testing the performance of replacing xattr in ext4

mount.sh

img=/dev/sdb1
dir=/mnt/ext4
file=$dir/file1

mkdir -p $dir
umount $dir

mke2fs -Fq -t ext4 -I 256 -O ea_inode $img
mount $img $dir

test.c

#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <attr/xattr.h>
#include <stdio.h>

#define DEFAULT_TIMES 1000000
#define SIZE 4096  // assume block size is 4096

int main (int argc, char **argv)
{
    const char* file = "/mnt/ext4/file1";
    const char* key = "user.test";
    char* value1 = malloc(SIZE);
    char* value2 = malloc(SIZE);
    int i = 0;
    int times = DEFAULT_TIMES;

    if (argc > 1) {
        times = atoi(argv[1]);
    }

    memset(value1, 'a', SIZE);
    memset(value2, 'b', SIZE);

    for (int  i = 0; i < times; ++i) {
        if (lsetxattr(file, key, value1, SIZE, 0)) {
            perror("lsetxattr");
            exit(EXIT_FAILURE);
        }
        if (lsetxattr(file, key, value2, SIZE, 0)) {
            perror("lsetxattr");
            exit(EXIT_FAILURE);
        }
    }
}