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fs: block_page_mkwrite should wait for writeback to finish
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 <[email protected]> Signed-off-by: Al Viro <[email protected]>
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