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  • Tejun Heo's avatar
    block, bdi: an active gendisk always has a request_queue associated with it · ff9ea323
    Tejun Heo authored
    bdev_get_queue() returns the request_queue associated with the
    specified block_device.  blk_get_backing_dev_info() makes use of
    bdev_get_queue() to determine the associated bdi given a block_device.
    
    All the callers of bdev_get_queue() including
    blk_get_backing_dev_info() assume that bdev_get_queue() may return
    NULL and implement NULL handling; however, bdev_get_queue() requires
    the passed in block_device is opened and attached to its gendisk.
    Because an active gendisk always has a valid request_queue associated
    with it, bdev_get_queue() can never return NULL and neither can
    blk_get_backing_dev_info().
    
    Make it clear that neither of the two functions can return NULL and
    remove NULL handling from all the callers.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Cc: Chris Mason <clm@fb.com>
    Cc: Dave Chinner <david@fromorbit.com>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    ff9ea323
compat_ioctl.c 20.8 KB