block: document the holder argument to blkdev_get_by_path
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20230620043536.707249-1-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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