nfsd: make sure data is on disk before calling ->fsync
nfsd is not using vfs_fsync, so I missed it when changing the calling convention during the 2.6.32 window. This patch fixes it to not only start the data writeout, but also wait for it to complete before calling into ->fsync. Signed-off-by: NChristoph Hellwig <hch@lst.de> Cc: stable@kernel.org Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
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