linux-kernel - [RFC v2 04/14] readahead: set file_ra_state->ra_pages to be at least mapping_min

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Date: Tue, 13 Feb 2024 10:37:03 +0100
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Cc: mcgrof@...nel.org,
	gost.dev@...sung.com,
	akpm@...ux-foundation.org,
	kbusch@...nel.org,
	djwong@...nel.org,
	chandan.babu@...cle.com,
	p.raghav@...sung.com,
	linux-kernel@...r.kernel.org,
	hare@...e.de,
	willy@...radead.org,
	linux-mm@...ck.org,
	david@...morbit.com
Subject: [RFC v2 04/14] readahead: set file_ra_state->ra_pages to be at least mapping_min_order

From: Luis Chamberlain <mcgrof@...nel.org>

Set the file_ra_state->ra_pages in file_ra_state_init() to be at least
mapping_min_order of pages if the bdi->ra_pages is less than that.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 mm/readahead.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/readahead.c b/mm/readahead.c
index 2648ec4f0494..4fa7d0e65706 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -138,7 +138,12 @@
 void
 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)
 {
+	unsigned int min_nrpages = mapping_min_folio_nrpages(mapping);
+	unsigned int max_pages = inode_to_bdi(mapping->host)->io_pages;
+
 	ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages;
+	if (ra->ra_pages < min_nrpages && min_nrpages < max_pages)
+		ra->ra_pages = min_nrpages;
 	ra->prev_pos = -1;
 }
 EXPORT_SYMBOL_GPL(file_ra_state_init);
-- 
2.43.0