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linux/fs/nfs/io.c
Trond Myklebust f1e31607e7 NFS: Fix a race between mmap() and O_DIRECT 
commit e231c6879c upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-16 20:22:59 +01:00

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