[PATCH 2/2] fs: block_page_mkwrite should wait for writeback to finish

[Darrick J. Wong]

For filesystems such as nilfs2 and xfs that use block_page_mkwrite, modify that
function to wait for pending writeback before allowing the page to become
writable.  This is needed to stabilize pages during writeback for those two
filesystems.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/buffer.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)


diff --git a/fs/buffer.c b/fs/buffer.c
index 698c6b2..49c9aad 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2382,6 +2382,7 @@ int __block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 		ret = -EAGAIN;
 		goto out_unlock;
 	}
+	wait_on_page_writeback(page);
 	return 0;
 out_unlock:
 	unlock_page(page);

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