Utility to fill up XFS file system without writing data to disk

xfs-bloat.c

/*
 * xfs-bloat.c
 * 
 * Create a file that allocates a large amount of space on an XFS file system.
 *
 * Compilation:
 * gcc -Wall xfs-bloat.c -o xfs-bloat
 */

#include <xfs/xfs.h>
#include <xfs/xfs_fs.h>
#include <stdio.h>

#define TEBIBYTE 1024*1024*1024*1024LL

int main(int argc, char **argv)
{
    int fd;
    int ret;
    if (argc != 2) {
        printf("Usage: xfs-bloat <filename>\n");
        printf("\n");
        printf("Preallocate a 1TiB file without actually writing data to "
                "disk\n");
        return 1;
    }

    fd = open(argv[1], O_CREAT|O_RDWR|O_EXCL, S_IRUSR|S_IWUSR);
    if (fd == -1) {
        printf("Creating file failed\n");
        return 1;
    }

    ret = platform_test_xfs_fd(fd);
    if (ret != 1) {
        printf("Opened file does not reside on XFS: %i\n", ret);
        return 1;
    }
    ret = platform_test_xfs_path(argv[1]);
    if (ret != 1) {
        printf("File does not reside on XFS: %i\n", ret);
        return 1;
    }

    xfs_flock64_t flag = {0};
    flag.l_whence = SEEK_SET;
    flag.l_start = 0;
    flag.l_len = TEBIBYTE;
    ret = xfsctl(argv[1], fd, XFS_IOC_RESVSP64, &flag);
    if (ret != 0) {
        printf("Call to xfsctl failed: %i\n", ret);
        return 1;
    }

    if (close(fd) == -1) {
        printf("Closing the file failed\n");
        return 1;
    }

    printf("%s file created\n", argv[1]);

    return 0;
}