[v5,18/39] iomap: Inline data shouldn't see large pages
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Message ID 20200529025824.32296-19-willy@infradead.org
State New
Headers show
Series
  • Large pages in the page cache
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Commit Message

Matthew Wilcox May 29, 2020, 2:58 a.m. UTC
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

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@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/iomap/buffered-io.c | 2 ++
 1 file changed, 2 insertions(+)

Patch
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diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 8767241ae535..5b37844b7d97 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);
@@ -736,6 +737,7 @@  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);