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[12/14] iomap: Inline data shouldn't see THPs

Message ID 20201014030357.21898-13-willy@infradead.org (mailing list archive)
State New
Headers show
Series Transparent Huge Page support for XFS | expand

Commit Message

Matthew Wilcox (Oracle) Oct. 14, 2020, 3:03 a.m. UTC
Assert that we're not seeing THPs 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(+)
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Patch

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 38fd69ebd4cc..38b6b75e7639 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -247,6 +247,7 @@  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);
@@ -782,6 +783,7 @@  static size_t 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));
 
 	flush_dcache_page(page);