• Tejun Heo's avatar
    block: introduce partition 0 · b5d0b9df
    Tejun Heo authored
    genhd and partition code handled disk and partitions separately.  All
    information about the whole disk was in struct genhd and partitions in
    struct hd_struct.  However, the whole disk (part0) and other
    partitions have a lot in common and the data structures end up having
    good number of common fields and thus separate code paths doing the
    same thing.  Also, the partition array was indexed by partno - 1 which
    gets pretty confusing at times.
    
    This patch introduces partition 0 and makes the partition array
    indexed by partno.  Following patches will unify the handling of disk
    and parts piece-by-piece.
    
    This patch also implements disk_partitionable() which tests whether a
    disk is partitionable.  With coming dynamic partition array change,
    the most common usage of disk_max_parts() will be testing whether a
    disk is partitionable and the number of max partitions will become
    much less important.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
    b5d0b9df
block_dev.c 30.7 KB