BPF_FS_MAGIC
sb->s_magic = BPF_FS_MAGIC;
#ifndef BPF_FS_MAGIC
return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
#ifndef BPF_FS_MAGIC
#ifndef BPF_FS_MAGIC
if (!err && st_fs.f_type != BPF_FS_MAGIC) {