mount: set nsid for each mount point

We want to look up mntns by mnt_id.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/proc_parse.h

@@ -121,6 +121,7 @@ struct mount_info {
 	int		is_file;
 	bool		is_ns_root;
 	struct mount_info *next;
+	struct ns_id	*nsid;
 
 	/* tree linkage */
 	struct mount_info *parent;
@@ -144,7 +145,7 @@ extern void mnt_entry_free(struct mount_info *mi);
 
 struct vm_area_list;
 
-extern struct mount_info *parse_mountinfo(pid_t pid);
+extern struct mount_info *parse_mountinfo(pid_t pid, struct ns_id *nsid);
 extern int parse_pid_stat(pid_t pid, struct proc_pid_stat *s);
 extern int parse_pid_stat_small(pid_t pid, struct proc_pid_stat_small *s);
 extern int parse_smaps(pid_t pid, struct vm_area_list *vma_area_list, bool use_map_files);

mount.c

@@ -87,7 +87,7 @@ int collect_mount_info(pid_t pid)
 {
 	pr_info("Collecting mountinfo\n");
 
-	mntinfo = parse_mountinfo(pid);
+	mntinfo = parse_mountinfo(pid, NULL);
 	if (!mntinfo) {
 		pr_err("Parsing mountinfo %d failed\n", getpid());
 		return -1;
@@ -834,7 +834,7 @@ struct mount_info *collect_mntinfo(struct ns_id *ns)
 	if (mntns_collect_root(ns->pid) < 0)
 		return NULL;
 
-	pm = parse_mountinfo(ns->pid);
+	pm = parse_mountinfo(ns->pid, ns);
 	if (!pm) {
 		pr_err("Can't parse %d's mountinfo\n", ns->pid);
 		return NULL;
@@ -845,7 +845,6 @@ struct mount_info *collect_mntinfo(struct ns_id *ns)
 		goto err;
 
 	return pm;
-
 err:
 	while (pm) {
 		p = pm;
@@ -1481,6 +1480,7 @@ static int collect_mnt_from_image(struct mount_info **pms, struct ns_id *nsid)
 		if (!pm)
 			goto err;
 
+		pm->nsid = nsid;
 		pm->next = *pms;
 		*pms = pm;
 

proc_parse.c

@@ -906,7 +906,7 @@ err:
 	return ret;
 }
 
-struct mount_info *parse_mountinfo(pid_t pid)
+struct mount_info *parse_mountinfo(pid_t pid, struct ns_id *nsid)
 {
 	struct mount_info *list = NULL;
 	FILE *f;
@@ -927,6 +927,8 @@ struct mount_info *parse_mountinfo(pid_t pid)
 		if (!new)
 			goto err;
 
+		new->nsid = nsid;
+
 		new->next = list;
 		list = new;