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    Subject[PATCH 2/2] Add BLKPG_GET_PARTITION operation
    Date
    Add a new operation to the BLKPG ioctl to read the partition.
    This allows user space to find the current start and length
    of a partition without having to open the partition and use
    the long depreciated HDIO_GETGEO ioctl.

    Signed-off-by: Phillip Susi <psusi@cfl.rr.com>
    ---
    block/ioctl.c | 15 +++++++++++++++
    include/linux/blkpg.h | 1 +
    2 files changed, 16 insertions(+), 0 deletions(-)

    diff --git a/block/ioctl.c b/block/ioctl.c
    index e4e9198..c84a949 100644
    --- a/block/ioctl.c
    +++ b/block/ioctl.c
    @@ -139,6 +139,21 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
    disk_put_part(part);
    mutex_unlock(&bdev->bd_mutex);
    return 0;
    + case BLKPG_GET_PARTITION:
    + mutex_lock(&bdev->bd_mutex);
    + part = disk_get_part(disk, partno);
    + if (!part)
    + {
    + mutex_unlock(&bdev->bd_mutex);
    + return -ENXIO;
    + }
    + p.start = part->start_sect << 9;
    + p.length = part->nr_sects << 9;
    + disk_put_part(part);
    + mutex_unlock(&bdev->bd_mutex);
    + if (copy_to_user(a.data, &p, sizeof(struct blkpg_partition)))
    + return -EFAULT;
    + return 0;
    default:
    return -EINVAL;
    }
    diff --git a/include/linux/blkpg.h b/include/linux/blkpg.h
    index a851944..72bf5e2 100644
    --- a/include/linux/blkpg.h
    +++ b/include/linux/blkpg.h
    @@ -41,6 +41,7 @@ struct blkpg_ioctl_arg {
    #define BLKPG_ADD_PARTITION 1
    #define BLKPG_DEL_PARTITION 2
    #define BLKPG_RESIZE_PARTITION 3
    +#define BLKPG_GET_PARTITION 4

    /* Sizes of name fields. Unused at present. */
    #define BLKPG_DEVNAMELTH 64
    --
    1.7.5.4


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