On Fri, Aug 11, 2023 at 12:08:13PM +0200, Christoph Hellwig wrote:

btrfs_scan_one_device opens the block device only to read the super
block.  Instead of passing a blk_mode_t argument to sometimes open
it for writing, just hard code BLK_OPEN_READ as it will never write
to the device or hand the block_device out to someone else.

Signed-off-by: Christoph Hellwig <hch@lst.de>
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Looks good to me,
Reviewed-by: Christian Brauner <brauner@kernel.org>