ceph: fetch cap_gen under spinlock in ceph_add_cap
It's protected by the s_gen_ttl_lock, so we should fetch under it and ensure that we're using the same generation in both places. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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