[PATCH v4 17/36] iomap: Inline data shouldn't see large pages

[Matthew Wilcox]

From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>

Assert that we're not seeing large pages in functions that read/write
inline data, rather than zeroing out the tail.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/iomap/buffered-io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index b7504b8aa90c..782757258a28 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -221,6 +221,7 @@ iomap_read_inline_data(struct inode *inode, struct page *page,
 		return;
 
 	BUG_ON(page->index);
+	BUG_ON(PageCompound(page));
 	BUG_ON(size > PAGE_SIZE - offset_in_page(iomap->inline_data));
 
 	addr = kmap_atomic(page);
@@ -732,6 +733,7 @@ iomap_write_end_inline(struct inode *inode, struct page *page,
 	void *addr;
 
 	WARN_ON_ONCE(!PageUptodate(page));
+	BUG_ON(PageCompound(page));
 	BUG_ON(pos + copied > PAGE_SIZE - offset_in_page(iomap->inline_data));
 
 	addr = kmap_atomic(page);
-- 
2.26.2