NFSv4.1/pnfs: Ensure that writes respect the O_SYNC flag when doing O_DIRECT

If the caller does not specify the O_SYNC flag, then it is legitimate
to return from O_DIRECT without doing a pNFS layoutcommit operation.
However if the file is opened O_DIRECT|O_SYNC then we'd better get it
right.

Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/direct.c

···
 			if (i_size_read(inode) < iocb->ki_pos)
 				i_size_write(inode, iocb->ki_pos);
 			spin_unlock(&inode->i_lock);
+			generic_write_sync(file, pos, result);
 		}
 	}
 	nfs_direct_req_release(dreq);

fs/nfs/file.c

···
 
 	trace_nfs_fsync_enter(inode);
 
+	nfs_inode_dio_wait(inode);
 	do {
 		ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 		if (ret != 0)

fs/nfs/nfs4file.c

···
 
 	trace_nfs_fsync_enter(inode);
 
+	nfs_inode_dio_wait(inode);
 	do {
 		ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 		if (ret != 0)