[PATCH 04/12] mm/readahead: add readahead_control->uncached member

Jens Axboe
2024-12-03T15:32:51Z

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

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
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 bcf0865a38ae..72b03b37c265 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1353,6 +1353,7 @@ 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 8424bf1b67e2..33a2d0feae14 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