fs: Propagate write hints to the struct block_device inode

Write hints applied with F_SET_RW_HINT on a block device affect the
block device inode only. Propagate these hints to the inode associated
with struct block_device because that is the inode used when writing
back dirty pages.

Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Kanchan Joshi <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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