mm/filemap: unify read/write dropbehind naming

The read side is filemap_end_dropbehind_read(), while the write side
used folio_ as the prefix rather than filemap_. The read side makes more
sense, unify the naming such that the write side follows that.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/20250527133255.452431-5-axboe@kernel.dk
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: axboe

mm/filemap.c

@@ -1604,7 +1604,7 @@ static void filemap_end_dropbehind(struct folio *folio)
  * completes. Do that now. If we fail, it's likely because of a big folio -
  * just reset dropbehind for that case and latter completions should invalidate.
  */
-static void folio_end_dropbehind_write(struct folio *folio)
+static void filemap_end_dropbehind_write(struct folio *folio)
 {
 	/*
 	 * Hitting !in_task() should not happen off RWF_DONTCACHE writeback,
@@ -1659,7 +1659,7 @@ void folio_end_writeback(struct folio *folio)
 	acct_reclaim_writeback(folio);
 
 	if (folio_dropbehind)
-		folio_end_dropbehind_write(folio);
+		filemap_end_dropbehind_write(folio);
 	folio_put(folio);
 }
 EXPORT_SYMBOL(folio_end_writeback);