NFSv4.1: Ensure that the layout sequence id stays 'close' to the current
authorTrond Myklebust <Trond.Myklebust@netapp.com>
Thu, 4 Oct 2012 23:32:22 +0000 (16:32 -0700)
committerTrond Myklebust <Trond.Myklebust@netapp.com>
Thu, 4 Oct 2012 23:57:48 +0000 (16:57 -0700)
Clamp the layout barrier sequence id to the current sequence id
minus the maximum number of outstanding layoutget requests.

Also ensure that we correctly initialise lo->plh_barrier if there are
no layout segments associated to this layout header.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

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