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    Subject[PATCH] block: add GENHD_FL_UNPARTITIONABLE
    There are cases where suppressing partition scan is useful - e.g. for
    lo devices and pseudo SATA devices which advertise to be a disk but
    get upset on partition scan (some port multiplier control devices show
    such behavior).

    This patch adds GENHD_FL_UNPARTITIONABLE which suppresses partition
    scan regardless of the number of possible partitions.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Cc: Kay Sievers <kay.sievers@vrfy.org>
    ---
    include/linux/genhd.h | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    diff --git a/include/linux/genhd.h b/include/linux/genhd.h
    index 02fa469..a6f9329 100644
    --- a/include/linux/genhd.h
    +++ b/include/linux/genhd.h
    @@ -128,6 +128,7 @@ struct hd_struct {
    #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
    #define GENHD_FL_NATIVE_CAPACITY 128
    #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
    +#define GENHD_FL_UNPARTITIONABLE 512

    enum {
    DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
    @@ -236,7 +237,8 @@ static inline int disk_max_parts(struct gendisk *disk)

    static inline bool disk_partitionable(struct gendisk *disk)
    {
    - return disk_max_parts(disk) > 1;
    + return disk_max_parts(disk) > 1 &&
    + !(disk->flags & GENHD_FL_UNPARTITIONABLE);
    }

    static inline dev_t disk_devt(struct gendisk *disk)

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