linux-kernel - [PATCH v2 4/5] fs: use nth_page() in place of direct struct page manipulation.

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Date:   Wed,  6 Sep 2023 11:03:08 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Cc:     Zi Yan <ziy@...dia.com>, Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>, stable@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v2 4/5] fs: use nth_page() in place of direct struct page manipulation.

From: Zi Yan <ziy@...dia.com>

When dealing with hugetlb pages, struct page is not guaranteed to be
contiguous on SPARSEMEM without VMEMMAP. Use nth_page() to handle it
properly.

Fixes: 38c1ddbde6c6 ("hugetlbfs: improve read HWPOISON hugepage")
Cc: <stable@...r.kernel.org>
Signed-off-by: Zi Yan <ziy@...dia.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
---
 fs/hugetlbfs/inode.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 316c4cebd3f3..60fce26ff937 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -295,7 +295,7 @@ static size_t adjust_range_hwpoison(struct page *page, size_t offset, size_t byt
 	size_t res = 0;
 
 	/* First subpage to start the loop. */
-	page += offset / PAGE_SIZE;
+	page = nth_page(page, offset / PAGE_SIZE);
 	offset %= PAGE_SIZE;
 	while (1) {
 		if (is_raw_hwpoison_page_in_hugepage(page))
@@ -309,7 +309,7 @@ static size_t adjust_range_hwpoison(struct page *page, size_t offset, size_t byt
 			break;
 		offset += n;
 		if (offset == PAGE_SIZE) {
-			page++;
+			page = nth_page(page, 1);
 			offset = 0;
 		}
 	}
-- 
2.40.1