[PATCH 1/6] dm: use bdev_read_only to check if a device is read-only

[Martin K. Petersen]

Christoph,

> dm-thin and dm-cache also work on partitions, so use the proper
> interface to check if the device is read-only.

Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>

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Martin K. Petersen	Oracle Linux Engineering