ceph: explicitly reference rename old_dentry parent dir in request
We carry a pin on the parent directory for the rename source and dest dentries. For the source it's r_locked_dir; we need to explicitly reference the old_dentry parent as well, since the dentry's d_parent may change between when the request was created and pinned and when it is freed. Reviewed-by: NYehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: NSage Weil <sage@newdream.net>
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