[PATCH 2/7] 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 a08bb8e..cf9a795 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2361,6 +2361,7 @@ block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 	if (!ret)
 		ret = block_commit_write(page, 0, end);
 
+	wait_on_page_writeback(page);
 	if (unlikely(ret)) {
 		unlock_page(page);
 		if (ret == -ENOMEM)

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