• Eric Farman's avatar
    block: Fix target variable of BLKSECTGET ioctl · 48265250
    Eric Farman authored
    Commit 6f607174 ("raw-posix: Fetch max sectors for host block device")
    introduced a routine to call the kernel BLKSECTGET ioctl, which stores the
    result back to user space.  However, the size of the data returned depends
    on the routine handling the ioctl.  The (compat_)blkdev_ioctl returns a
    short, while sg_ioctl returns an int.  Thus, on big-endian systems, we can
    find ourselves accidentally shifting the result to a much larger value.
    (On s390x, a short is 16 bits while an int is 32 bits.)
    
    Also, the two ioctl handlers return values in different scales (block
    returns sectors, while sg returns bytes), so some tweaking of the outputs
    is required such that hdev_get_max_transfer_length returns a value in a
    consistent set of units.
    Signed-off-by: 's avatarEric Farman <farman@linux.vnet.ibm.com>
    Message-Id: <20170120162527.66075-3-farman@linux.vnet.ibm.com>
    Reviewed-by: 's avatarFam Zheng <famz@redhat.com>
    Signed-off-by: 's avatarPaolo Bonzini <pbonzini@redhat.com>
    48265250
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