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block: add a bdev_is_partition helper

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Add a littler helper to make the somewhat arcane bd_contains checks a
little more obvious.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-09-03 07:40:57 +02:00
committed by Jens Axboe
parent 250eec9e39
commit fa01b1e973
10 changed files with 22 additions and 17 deletions
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2
drivers/mmc/core/block.c
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@@ -723,7 +723,7 @@ static int mmc_blk_check_blkdev(struct block_device *bdev)
* whole block device, not on a partition. This prevents overspray
* between sibling partitions.
*/
if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
return -EPERM;
return 0;
}