linux-kernel - [PATCH 1/4] iomap: make sure iomap_adjust_read_range() are aligned with block

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Message-ID: <20250810044806.3433783-2-alexjlzheng@tencent.com>
Date: Sun, 10 Aug 2025 12:48:03 +0800
From: alexjlzheng@...il.com
To: brauner@...nel.org,
	djwong@...nel.org
Cc: linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jinliang Zheng <alexjlzheng@...cent.com>
Subject: [PATCH 1/4] iomap: make sure iomap_adjust_read_range() are aligned with block_size

From: Jinliang Zheng <alexjlzheng@...cent.com>

iomap_folio_state marks the uptodate state in units of block_size, so
it is better to check that pos and length are aligned with block_size.

Signed-off-by: Jinliang Zheng <alexjlzheng@...cent.com>
---
 fs/iomap/buffered-io.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index fd827398afd2..27fa93ca8675 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -234,6 +234,9 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio,
 	unsigned first = poff >> block_bits;
 	unsigned last = (poff + plen - 1) >> block_bits;
 
+	BUG_ON(*pos % block_size);
+	BUG_ON(length % block_size);
+
 	/*
 	 * If the block size is smaller than the page size, we need to check the
 	 * per-block uptodate status and adjust the offset and length if needed
-- 
2.49.0