bwrite
bwrite(IO *io, const void *buf, size_t len)
bwrite(int fd, const void *loc, size_t num)
bwrite(int fd, char *buf, daddr_t blk, long size)
bwrite(int fd, char *buf, daddr_t blk, long size)
bwrite(struct ubuf * bp)
bwrite(daddr_t blk, char *buffer, int size, const char *file)
bwrite(buf_t *bp)
bwrite(struct buf *bp)