[RFC 14/23] readahead: allocate folios with mapping_min_order in ra_unbounded()

[Pankaj Raghav]

From: Pankaj Raghav <p.raghav@xxxxxxxxxxx>

Allocate folios with mapping_min_order order in
page_cache_ra_unbounded(). Also adjust the accounting to take the
folio_nr_pages in the loop.

Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
---
 mm/readahead.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/readahead.c b/mm/readahead.c
index 5c4e7ee64dc1..2a9e9020b7cf 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -250,7 +250,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
 			continue;
 		}
 
-		folio = filemap_alloc_folio(gfp_mask, 0);
+		folio = filemap_alloc_folio(gfp_mask,
+					    mapping_min_folio_order(mapping));
 		if (!folio)
 			break;
 		if (filemap_add_folio(mapping, folio, index + i,
@@ -264,7 +265,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
 		if (i == nr_to_read - lookahead_size)
 			folio_set_readahead(folio);
 		ractl->_workingset |= folio_test_workingset(folio);
-		ractl->_nr_pages++;
+		ractl->_nr_pages += folio_nr_pages(folio);
+		i += folio_nr_pages(folio) - 1;
 	}
 
 	/*
-- 
2.40.1