fscrypt_set_bio_crypt_ctx_bh is only used by submit_bh_wbc now. Move it
there and merge bh_get_inode_and_lblk_num into it.
Note that this does not add ifdefs for fscrypt as the compiler will
optimize away the dead code if it is not built in.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20260302141922.370070-6-hch@lst.de
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
a18b1ab816