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NFS: Fix a race between mmap() and O_DIRECT

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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+
This commit is contained in:
Trond Myklebust 2018-01-28 09:29:41 -05:00
parent 128159f292
commit e231c6879c
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/io.c
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@ -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);
}
}