block: Don't revalidate bdev of hidden gendisk
When hidden gendisk is revalidated, there's no point in revalidating associated block device as there's none. We would thus just create new bdev inode, report "detected capacity change from 0 to XXX" message and evict the bdev inode again. Avoid this pointless dance and confusing message in the kernel log. Reviewed-by: NHannes Reinecke <hare@suse.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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