nfsd: use vfs_fsync for non-directories
Instead of opencoding the fsync calling sequence use vfs_fsync. This also gets rid of the useless i_mutex over the data writeout. Consolidate the remaining special code for syncing directories and document it's quirks. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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