f2fs: avoid to truncate non-updated page partially
After we call find_data_page in truncate_partial_data_page, we could not guarantee this page is updated or not as error may occurred in lower layer. We'd better check status of the page to avoid this no updated page be writebacked to device. Signed-off-by: NChao Yu <chao2.yu@samsung.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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