NFS: Use raw_write_seqcount_begin/end int nfs4_reclaim_open_state

NFS: Use raw_write_seqcount_begin/end int nfs4_reclaim_open_state

commit abbec2da13f0e4c5d9b78b7e2c025a3e617228ba upstream.

The addition of lockdep code to write_seqcount_begin/end has lead to
a bunch of false positive claims of ABBA deadlocks with the so_lock
spinlock. Audits show that this simply cannot happen because the
read side code does not spin while holding so_lock.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>