new helper: __dentry_path()
builds path relative to fs root, called under dcache_lock,
doesn't append any nonsense to unlinked ones.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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builds path relative to fs root, called under dcache_lock,
doesn't append any nonsense to unlinked ones.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>