[CRIU] [PATCH 07/27] mounts: share one root for all namespaces

[Andrey Vagin]

Currently we support nested mount namespaces, only if all of them have
the same root.

crtools doesn't mount root, so it should be bind-mounted for all
namespaces.

Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 mount.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mount.c b/mount.c
index bd2da62..8c91e05 100644
--- a/mount.c
+++ b/mount.c
@@ -242,6 +242,12 @@ static struct mount_info *mnt_build_ids_tree(struct mount_info *list)
 					m->mnt_id, m->parent_mnt_id, m->mountpoint,
 					root ? "found" : "not found");
 			if (root && m->is_ns_root) {
+				if (!mounts_equal(root, m, true) ||
+					(strcmp(root->root, m->root))) {
+					pr_err("Nested mount namespaces with different roots are not supported yet");
+					return NULL;
+				}
+
 				/*
 				 * A root of a sub mount namespace is
 				 * mounted in a temporary directory in the
-- 
1.8.5.3