xfs: unlock the inode before log force in xfs_fs_nfs_commit_metadata
Only read the LSN we need to push to with the ilock held, and then release it before we do the log force to improve concurrency. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NAlex Elder <aelder@sgi.com>
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