Re: [PATCH v2 4/7] block: refactor bio_get_user_pages() from __bio_map_user_iov()

[Christoph Hellwig]

This switches to opencoding bio_add_pc_page, and thus losing the
max_hw_sectors check.  Additionally it exports a function that's
not used outside the file without a user showing up in the
series.

For now I'd suggest defeing this to the series that uses it, but
I suspect we can't really use common code between SG_IO and direct I/O
in the end due to the different nature of filesystem vs BLOCK_PC I/O.
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