From 91bb95f2689e84856ecdf6fac365489d36709cf9 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 1 May 2012 15:24:39 -0400 Subject: [PATCH] 4set_root: force "fsid=0" for all exports of '/' When "fsid=0" is not explicitly given in /etc/exports, v4set_root creates a pseudo (NFSEXP_V4ROOT) export for '/' with fsid 0 so that an NFSv4 client can find the root. However if '/' is explicitly exported to the client, then that explicit export must be used, and it will not have fsid=0. So we must impose fsid=0 on all exports of '/'. Without this, if '/' is exported to a client, that client will not be able to mount '/' with NFSv4. Signed-off-by: NeilBrown Signed-off-by: Steve Dickson --- utils/mountd/v4root.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/utils/mountd/v4root.c b/utils/mountd/v4root.c index 81f813b..b4fdcce 100644 --- a/utils/mountd/v4root.c +++ b/utils/mountd/v4root.c @@ -192,6 +192,13 @@ v4root_set() */ continue; + if (strcmp(exp->m_export.e_path, "/") == 0 && + !(exp->m_export.e_flags & NFSEXP_FSID)) { + /* Force '/' to be exported as fsid == 0*/ + exp->m_export.e_flags |= NFSEXP_FSID; + exp->m_export.e_fsid = 0; + } + v4root_add_parents(exp); /* XXX: error handling! */ } -- 2.39.5