pnfs/blocklayout: set PNFS_LAYOUTRETURN_ON_ERROR
If there's an error doing I/O to block device, and the client resends the I/O to the MDS, the MDS must recall the layout from the client before processing the I/O. Let's preempt that exchange by returning the layout before falling back to the MDS when there's an error. Signed-off-by: NBenjamin Coddington <bcodding@redhat.com> Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
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