[PATCH v4 18/36] iomap: Handle tail pages in iomap_page_mkwrite

Matthew Wilcox
2020-05-15T13:18:38Z

iomap_page_mkwrite() can be called with a tail page. If we are,
operate on the head page, since we're treating the entire thing as a
single unit and the whole page is dirtied at the same time.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
fs/iomap/buffered-io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 782757258a28..c9636d55a4be 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1060,7 +1060,7 @@ iomap_page_mkwrite_actor(struct inode *inode, loff_t pos, loff_t length,

vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops)
{
- struct page *page = vmf->page;
+ struct page *page = compound_head(vmf->page);
struct inode *inode = file_inode(vmf->vma->vm_file);
unsigned long length;
loff_t offset;
--
2.26.2