#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <liblustre.h>#include <lustre_lib.h>#include <obd.h>int main(int argc, char **argv){    struct obd_ioctl_data data = { 0 };    char rawbuf[8192], parent[4096], *buf = rawbuf, *base, *t;    int max = sizeof(rawbuf), fd, offset, rc;    if (argc != 2) {        printf("usage: %s filename\n", argv[0]);        return 1;    }    base = argv[1];    t = strrchr(base, '/');    if (!t) {        strcpy(parent, ".");        offset = -1;    } else {        strncpy(parent, base, t - base);        offset = t - base - 1;    }    fd = open(parent, O_RDONLY);    if (fd < 0) {        printf("open(%s) error: %s\n", parent, strerror(errno));        exit(errno);    }    data.ioc_version = OBD_IOCTL_VERSION;    data.ioc_len = sizeof(data);    if (offset >= 0)        data.ioc_inlbuf1 = base + offset + 2;    else        data.ioc_inlbuf1 = base;    data.ioc_inllen1 = strlen(data.ioc_inlbuf1) + 1;        if (obd_ioctl_pack(&data, &buf, max)) {        printf("ioctl_pack failed.\n");        exit(1);    }        rc = ioctl(fd, IOC_MDC_LOOKUP, buf);    if (rc < 0) {        printf("ioctl(%s/%s) error: %s\n", parent,               data.ioc_inlbuf1, strerror(errno));        exit(errno);    }    return 0;}