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Because of udevs complaining device mapper now creates /dev/dm-N as the real
device nodes, and just symlinks the /dev/mapper/ names to it. This would be
easy if everything used the /dev/mapper clear names, but most system utilities
translate them back to the /dev/mapper/ names and thus confuse various test
cases. Add support to _is_block_dev to read symlinks, and add documentation
on how to run xfstests on device mapper volumes.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
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