dcache: extrace and use d_unlinked()
d_unlinked() will be used in middle-term to ban checkpointing when opened but unlinked file is detected, and in long term, to detect such situation and special case on it. Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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