flexfiles: use per-mirror specified stateid for IO
[ Upstream commit bb21ce0a ] rfc8435 says: For tight coupling, ffds_stateid provides the stateid to be used by the client to access the file. However current implementation replaces per-mirror provided stateid with by open or lock stateid. Ensure that per-mirror stateid is used by ff_layout_write_prepare_v4 and nfs4_ff_layout_prepare_ds. Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de> Signed-off-by: Rick Macklem <rmacklem@uoguelph.ca> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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