NFSv4: Clear the NFS_CAP_XATTR flag if not supported by the server

[ Upstream commit 4fb2b67 ]

nfs_server_set_fsinfo() shouldn't assume that NFS_CAP_XATTR is unset
on entry to the function.

Fixes: b78ef84 ("NFSv4.2: query the server for extended attribute support")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Trond Myklebust

fs/nfs/client.c

@@ -881,6 +881,8 @@ static void nfs_server_set_fsinfo(struct nfs_server *server,
 
 	if (fsinfo->xattr_support)
 		server->caps |= NFS_CAP_XATTR;
+	else
+		server->caps &= ~NFS_CAP_XATTR;
 #endif
 }