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linux/fs/nfs/io.c
Trond Myklebust e231c6879c NFS: Fix a race between mmap() and O_DIRECT 
When locking the file in order to do O_DIRECT on it, we must unmap
any mmapped ranges on the pagecache so that we can flush out the
dirty data.

Fixes: a5864c999d ("NFS: Do not serialise O_DIRECT reads and writes")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org # v4.8+
2018-01-28 22:00:15 -05:00

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