pnfs: save layoutcommit cred at layout header init
No need to save it for every lseg. No need to save it at every pnfs_set_layoutcommit. [Needed in v3.0] CC: Stable Tree <stable@kernel.org> Signed-off-by: NPeng Tao <peng_tao@emc.com> Signed-off-by: NBoaz Harrosh <bharrosh@panasas.com> Signed-off-by: NJim Rees <rees@umich.edu> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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