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Subject[PATCH 2/2] fs: block_page_mkwrite should wait for writeback to finish
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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@us.ibm.com>
---
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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