[PATCH 04/15] mm/readahead: add readahead_control->uncached member

[Jens Axboe <axboe@xxxxxxxxx>]

If ractl->uncached is set to true, then folios created are marked as
uncached as well.

Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
 include/linux/pagemap.h | 1 +
 mm/readahead.c          | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 68a5f1ff3301..8afacb7520d4 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1350,6 +1350,7 @@ struct readahead_control {
 	pgoff_t _index;
 	unsigned int _nr_pages;
 	unsigned int _batch_count;
+	bool uncached;
 	bool _workingset;
 	unsigned long _pflags;
 };
diff --git a/mm/readahead.c b/mm/readahead.c
index 003cfe79880d..8dbeab9bc1f0 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -191,7 +191,13 @@ static void read_pages(struct readahead_control *rac)
 static struct folio *ractl_alloc_folio(struct readahead_control *ractl,
 				       gfp_t gfp_mask, unsigned int order)
 {
-	return filemap_alloc_folio(gfp_mask, order);
+	struct folio *folio;
+
+	folio = filemap_alloc_folio(gfp_mask, order);
+	if (folio && ractl->uncached)
+		__folio_set_uncached(folio);
+
+	return folio;
 }
 
 /**
-- 
2.45.2