ref: aa8af9c5a32b5f3afe0e612981fe4d9fada43d34
dir: /sys/src/cmd/cdfs/fns.h/
Buf* bopen(long (*)(Buf*, void*, long, ulong), int, int, int); long bread(Buf*, void*, long, vlong); void bterm(Buf*); long bufread(Otrack*, void*, long, vlong); long bufwrite(Otrack*, void*, long); long bwrite(Buf*, void*, long); char* disctype(Drive *drive); void *emalloc(ulong); char* geterrstr(void); Drive* mmcprobe(Scsi*);