On Tue, May 11, 2021 at 10:47:34PM +0100, Matthew Wilcox (Oracle) wrote:

Match the page writeback functions by adding
folio_start_fscache(), folio_end_fscache(), folio_wait_fscache() and
folio_wait_fscache_killable().  Also rewrite the kernel-doc to describe
when to use the function rather than what the function does, and include
the kernel-doc in the appropriate rst file.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

Looks fine, but doesn't actually seem to be needed for this series.
I'd move it closer to actual users of the new helpers.

Otherwise:

Reviewed-by: Christoph Hellwig <hch@lst.de>