ceph: vet the target and parent inodes before updating dentry lease
In a later patch, we're going to need to allow ceph_fill_trace to update the dentry's lease when the parent is not locked. This is potentially racy though -- by the time we get around to processing the trace, the parent may have already changed. Change update_dentry_lease to take a ceph_vino pointer and use that to ensure that the dentry's parent still matches it before updating the lease. Signed-off-by: NJeff Layton <jlayton@redhat.com> Reviewed-by: NYan, Zheng <zyan@redhat.com> Signed-off-by: NIlya Dryomov <idryomov@gmail.com>
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