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Merge branch 'layoutfixes'
* layoutfixes:
NFSv4.1/pnfs: Remove redundant wakeup in pnfs_send_layoutreturn()
NFSv4.1/pnfs: Remove redundant check in pnfs_layoutgets_blocked()
NFSv4.1/pnfs: Remove redundant lo->plh_block_lgets in layoutreturn
NFSv4.1/pnfs: Don't prevent layoutgets when doing return-on-close
NFSv4.1/pnfs: Fix serialisation of layout return and layoutget
NFSv4.1/pnfs: Remove redundant checks in pnfs_layoutgets_blocked()
pNFS: Tighten up locking around DS commit buckets