Commit e231c687 authored Jan 28, 2018 by Trond Myklebust

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: a5864c99 ("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+

parent 128159f2

fs/nfs/io.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -99,7 +99,7 @@ static void nfs_block_buffered(struct nfs_inode nfsi, struct inode inode)
		{
		if (!test_bit(NFS_INO_ODIRECT, &nfsi->flags)) {
		set_bit(NFS_INO_ODIRECT, &nfsi->flags);
		nfs_wb_all(inode);
		nfs_sync_mapping(inode->i_mapping);
		}
		}