hanwen/go-fuse, nfs, readdir EINVAL error reproduce

test.c

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/syscall.h>
#include <stdint.h>


void checkerror(int retval) {
  int _errno = errno;
  if (retval < 0) {
    fprintf(stderr, "retno=%d, errno=%d, error=%s\n", retval, _errno, strerror(_errno));
    exit(1);
  }
}

char testdir[] = "testdir";
int maxindex = 1000;

void cleanup() {
  if (chdir(testdir) >= 0) {
    for(int i = 0; i<= maxindex; i++) {
      char buffer[100];
      sprintf(buffer, "%04d", i);
      rmdir(buffer);
    }
    chdir("..");
    checkerror(rmdir(testdir));
  }
}

void deletedirs(int start, int stop) {
  char buffer[100];
  for(int i = start; i < stop; i++) {
    sprintf(buffer, "%s/%04d", testdir, i);
    rmdir(buffer);
  }
}

void createdirs() {
  checkerror(mkdir(testdir, 0777));
  checkerror(chdir(testdir));
  for(int i = 0; i< maxindex; i++) {
    char buffer[100];
    sprintf(buffer, "%04d", i);
    checkerror(mkdir(buffer, 0777));
  }
  checkerror(chdir(".."));
}

#define BUF_SIZE 256

struct linux_dirent {
  long           d_ino;
  off_t          d_off;
  unsigned short d_reclen;
  char           d_name[];
};

void listdir() {
  int fd, nread;
  char buf[BUF_SIZE];
  int dirfrom = 100;

  fd = open(testdir, O_RDONLY | O_DIRECTORY);
  checkerror(fd);


  for (;;) {
    nread = syscall(SYS_getdents, fd, buf, BUF_SIZE);
    checkerror(nread);
    if (nread == 0) {
      break;
    }

    for (int bpos = 0; bpos < nread; ) {
      struct linux_dirent* d = (struct linux_dirent *) (buf + bpos);
      // uint64_t ino = d->d_ino;
      // char d_type = d_type = *(buf + bpos + d->d_reclen - 1);
			// printf("%s\t%8ld\t%d\n", d->d_name, ino, (int)d_type);
			bpos += d->d_reclen;
    }

    deletedirs(dirfrom, dirfrom+1);
    dirfrom += 1;
  }

  close(fd);
}

int main(void) {
  printf("start\n");

  cleanup();

  createdirs();

  listdir();
}