linux-kernel - [RFC 08/23] filemap: align the index to mapping_min_order in filemap_get_folios

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Date:   Fri, 15 Sep 2023 20:38:33 +0200
From:   Pankaj Raghav <kernel@...kajraghav.com>
To:     linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     p.raghav@...sung.com, david@...morbit.com, da.gomez@...sung.com,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        willy@...radead.org, djwong@...nel.org, linux-mm@...ck.org,
        chandan.babu@...cle.com, mcgrof@...nel.org, gost.dev@...sung.com
Subject: [RFC 08/23] filemap: align the index to mapping_min_order in filemap_get_folios_tag()

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

Align the index to the mapping_min_order number of pages while setting
the XA_STATE in filemap_get_folios_tag().

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 mm/filemap.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 15bc810bfc89..21e1341526ab 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2280,7 +2280,9 @@ EXPORT_SYMBOL(filemap_get_folios_contig);
 unsigned filemap_get_folios_tag(struct address_space *mapping, pgoff_t *start,
 			pgoff_t end, xa_mark_t tag, struct folio_batch *fbatch)
 {
-	XA_STATE(xas, &mapping->i_pages, *start);
+	unsigned int min_order = mapping_min_folio_order(mapping);
+	unsigned int nrpages = 1UL << min_order;
+	XA_STATE(xas, &mapping->i_pages, round_down(*start, nrpages));
 	struct folio *folio;
 
 	rcu_read_lock();
-- 
2.40.1