bcache: remove the cache_dev_name field from struct cache
Just use the %pg format specifier to print the name directly. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NColy Li <colyli@suse.de> Link: https://lore.kernel.org/r/20211020143812.6403-6-colyli@suse.deSigned-off-by: NJens Axboe <axboe@kernel.dk>
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