cgroup: stash cgroup_root reference into cgroup_fs_context
Note that this reference is *NOT* contributing to refcount of
cgroup_root in question and is valid only until cgroup_do_mount()
returns.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 725e9f6..45a198c 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -1208,6 +1208,7 @@ int cgroup1_get_tree(struct fs_context *fc)
if (root->flags ^ ctx->flags)
pr_warn("new mount options do not match the existing superblock, will be ignored\n");
+ ctx->root = root;
ret = 0;
goto out_unlock;
}
@@ -1234,7 +1235,8 @@ int cgroup1_get_tree(struct fs_context *fc)
goto out_unlock;
}
- init_cgroup_root(root, ctx);
+ ctx->root = root;
+ init_cgroup_root(ctx);
ret = cgroup_setup_root(root, ctx->subsys_mask);
if (ret)