Learning about max filename sizes in Ubuntu with encryptedfs home

console

pablo@eulogia:/tmp$ cat main.c 
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#ifdef __APPLE__
  #include <sys/param.h>
  #include <sys/mount.h>
#else
  #include <sys/statfs.h>
#endif

long get_max_namelen(struct statfs* buf) {
#ifdef __APPLE__
  return MNAMELEN;
#else
  return buf->f_namelen;
#endif
}

int main(int argc, const char** argv) {
  char path_buf[1024];
  const char *path = (argc == 2) ? strcpy(path_buf, argv[1]) : getcwd(path_buf, 1024);
  struct statfs *buf;

  statfs(path, buf);
  printf("statsfs for %s\n", path);
  printf("--------\n");
  printf("max namelen: %ld\n", get_max_namelen(buf));
  return 0;
}
pablo@eulogia:/tmp$ 
pablo@eulogia:/tmp$ gcc main.c -o main
pablo@eulogia:/tmp$ ./main 
statsfs for /tmp
--------
max namelen: 255
pablo@eulogia:/tmp$ ./main /home/pablo/
statsfs for /home/pablo/
--------
max namelen: 143
pablo@eulogia:/tmp$