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NFSv4.1: Add a helper pnfs_commit_and_return_layout
authorTrond Myklebust <Trond.Myklebust@netapp.com>
Wed, 20 Mar 2013 17:23:33 +0000 (13:23 -0400)
committerTrond Myklebust <Trond.Myklebust@netapp.com>
Thu, 21 Mar 2013 14:31:21 +0000 (10:31 -0400)
In order to be able to safely return the layout in nfs4_proc_setattr,
we need to block new uses of the layout, wait for all outstanding
users of the layout to complete, commit the layout and then return it.

This patch adds a helper in order to do all this safely.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>

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