[Devel] [VZ10 04/21] ve: Fix ve.h when !CONFIG_VE

[Vladimir Riabchun]

1. init_task.h contains init_cred and init_user_ns declarations and it
also includes ve_namespace.h. Because of this init_task.h include in
ve.h has no effect, leading to compilation error:
In file included from ./include/linux/ve_namespace.h:9,
                 from ./include/linux/init_task.h:13,
                 from kernel/nsproxy.c:15:
./include/linux/ve.h: In function 'current_user_ns_initial':
./include/linux/ve.h:308:37: error: 'init_cred' undeclared
  308 |         return current_user_ns() == init_cred.user_ns;
      |                                     ^~~~~~~~~
      |                                     put_cred

2. Function neq_eq requires net_namespace.h include.
3. Bunch of functions lack of non-VE variants.
4. Some places use get_ve result, don't void it.
5. Make ve_feature_set is a simple bool value

https://virtuozzo.atlassian.net/browse/VSTOR-130116

Feature: !CONFIG_VE build
Signed-off-by: Vladimir Riabchun <vladimir.riabchun at virtuozzo.com>
---
 include/linux/ve.h | 57 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/include/linux/ve.h b/include/linux/ve.h
index c64860664b62..73d334de22c9 100644
--- a/include/linux/ve.h
+++ b/include/linux/ve.h
@@ -291,7 +291,27 @@ static inline struct vdso_image *ve_get_vdso_64(struct ve_struct *ve)
 
 #else	/* CONFIG_VE */
 #include <linux/init_task.h>
-#define get_ve(ve)	((void)(ve), NULL)
+#include <net/net_namespace.h>
+
+extern struct cred init_cred;
+extern struct user_namespace init_user_ns;
+extern struct net init_net;
+
+static inline void ve_add_to_release_list(struct cgroup *cgrp) {}
+static inline void ve_rm_from_release_list(struct cgroup *cgrp) {}
+static inline const char *ve_ra_data_get_path_locked(struct ve_struct *ve,
+					struct cgroup_root *cgroot)
+{
+	return NULL;
+}
+static inline int ve_ra_data_set(struct ve_struct *ve, struct cgroup_root *cgroot,
+				 const char *release_agent)
+{
+	return 0;
+}
+static inline void cgroot_ve_cleanup_ra_data(struct cgroup_root *cgroot) {}
+
+#define get_ve(ve)	(ve)
 #define put_ve(ve)	do { (void)(ve); } while (0)
 
 DEFINE_FREE(put_ve, struct ve_struct *, if (_T) put_ve(_T))
@@ -306,12 +326,40 @@ static inline struct ve_struct *get_task_ve(struct task_struct *task)
 	return NULL;
 }
 
+static inline struct cgroup_subsys_state *ve_get_init_css(struct ve_struct *ve, int subsys_id)
+{
+	/* ve_get_init_css must be unreachable,
+	 *seems like it is called only when !ve_is_super(ve). Report violation here.
+	 */
+	BUG_ON(1);
+	return NULL;
+}
+
+
+static inline pid_t task_pid_ve_nr(struct task_struct *tsk)
+{
+	return task_pid_nr(tsk);
+}
+
+static inline struct time_namespace *ve_get_time_ns(struct ve_struct *ve)
+{
+	return NULL;
+}
+
 static inline void ve_stop_ns(struct pid_namespace *ns) { }
 static inline void ve_exit_ns(struct pid_namespace *ns) { }
+static inline bool ve_check_trusted_exec(struct file *file, struct filename *name)
+{
+	return true;
+}
+static inline bool ve_check_trusted_mmap(struct file *file)
+{
+	return true;
+}
 
 static inline void ve_set_state(struct ve_struct *ve, int new_state) {}
 
-#define ve_feature_set(ve, f)		{ true; }
+#define ve_feature_set(ve, f)		(true)
 
 static inline bool current_user_ns_initial(void)
 {
@@ -323,6 +371,11 @@ static inline struct user_namespace *ve_init_user_ns(void)
 	return &init_user_ns;
 }
 
+static inline int ve_net_hide_sysctl(struct net *net)
+{
+	return 0;
+}
+
 static inline bool is_ve_init_net(const struct net *net)
 {
 	return net_eq(net, &init_net);
-- 
2.43.0