example

c

#include <sys/syscall.h>
#include <linux/mount.h>
#include <sys/types.h>
#include <linux/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

typedef unsigned long long u64;

u64 buf[100005];

long statmount(const struct mnt_id_req *req,struct statmount *buf, size_t bufsize,unsigned int flags){
  return syscall(__NR_statmount,req,buf,bufsize,flags);
}
long listmount(const struct mnt_id_req *req,u64 *mnt_ids, size_t nr_mnt_ids,unsigned int flags){
  return syscall(__NR_listmount,req,mnt_ids,nr_mnt_ids,flags);
}

unsigned char buf3[100005];


int main(){
  struct statx statxbuf={0};
  unsigned long long rootmntid=statxbuf.stx_mnt_id;
  struct mnt_id_req req={0};
  req.size=sizeof(struct mnt_id_req);
  int ret=statx(0,"/",0,STATX_MNT_ID_UNIQUE,&statxbuf);
  if(ret<0){
    printf("statx error:%d",ret);
    return -1;
  }
  rootmntid=statxbuf.stx_mnt_id;
  req.param=0;
  req.mnt_id=rootmntid;
  ret=listmount(&req,buf,sizeof(buf)/sizeof(u64),0);
  if(ret<=0){
    printf("listmount error:%d",ret);
    return -2;
  }
  int n=ret;
  struct statmount *buf2=buf3;
  for(int i=0;i<n;i++){
    req.mnt_id=buf[i];
    req.param=STATMOUNT_MNT_ROOT|STATMOUNT_MNT_POINT|STATMOUNT_FS_TYPE|STATMOUNT_MNT_BASIC;
    ret=statmount(&req,buf2,sizeof(buf),0);
    if(ret<0){
      printf("statmount error :%d",ret);
      return -3;
    }
    printf("mnt_root:%s mnt_point:%s fs_type:%s mnt_parent_id:%lld\n",buf2->str+buf2->mnt_root,buf2->str+buf2->mnt_point,buf2->str+buf2->fs_type,buf2->mnt_parent_id);
  }
  return 0;
}