staging/lustre/ptlrpc: reorganize ptlrpc_request
ptlrpc_request has some structure members are only for client side, and some others are only for server side, this patch moved these members to different structure then putting into an union. By doing this, size of ptlrpc_request is decreased about 300 bytes, besides saving memory, it also can reduce memory footprint while processing. Signed-off-by: NLiang Zhen <liang.zhen@intel.com> Reviewed-on: http://review.whamcloud.com/8806 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-181Reviewed-by: NAndreas Dilger <andreas.dilger@intel.com> Reviewed-by: NBobi Jam <bobijam@gmail.com> Signed-off-by: NOleg Drokin <green@linuxhacker.ru> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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