ext4: convert move_extent_per_page() to use folios

ext4: convert move_extent_per_page() to use folios

Patch series "Removing the try_to_release_page() wrapper", v3.

This patchset replaces the remaining calls of try_to_release_page() with
the folio equivalent: filemap_release_folio().  This allows us to remove
the wrapper.

This patch (of 4):

Convert move_extent_per_page() to use folios.  This change removes 5 calls
to compound_head() and is in preparation for the removal of the
try_to_release_page() wrapper.

Link: https://lkml.kernel.org/r/20221118073055.55694-1-vishal.moola@gmail.com
Link: https://lkml.kernel.org/r/20221118073055.55694-2-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>