[PATCH v5 1/4] iomap: make sure iomap_adjust_read_range() are aligned with block_size

[alexjlzheng]

From: Jinliang Zheng <alexjlzheng@xxxxxxxxxxx>

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@xxxxxxxxxxx>
---
 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..ee1b2cd8a4b4 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;
 
+	WARN_ON_ONCE(*pos & (block_size - 1));
+	WARN_ON_ONCE(length & (block_size - 1));
+
 	/*
 	 * 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