linux-kernel - [PATCH 1/2] ns: Allow ns_entries to have custom symlink content

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Date:   Sat, 14 Jan 2017 17:14:48 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     <avagin@...nvz.org>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <ktkhai@...tuozzo.com>,
        <ebiederm@...ssion.com>, <gorcunov@...nvz.org>,
        <viro@...iv.linux.org.uk>
Subject: [PATCH 1/2] ns: Allow ns_entries to have custom symlink content

Make possible to have link content prefix yyy
different from the link name xxx:

$ readlink /proc/[pid]/ns/xxx
yyy:[4026531838]

This will be used in next patch.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 fs/nsfs.c               |    4 +++-
 include/linux/proc_ns.h |    1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/nsfs.c b/fs/nsfs.c
index 8c9fb29c6673..c2499c59bf51 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -182,9 +182,11 @@ int ns_get_name(char *buf, size_t size, struct task_struct *task,
 {
 	struct ns_common *ns;
 	int res = -ENOENT;
+	const char *name;
 	ns = ns_ops->get(task);
 	if (ns) {
-		res = snprintf(buf, size, "%s:[%u]", ns_ops->name, ns->inum);
+		name = ns_ops->real_ns_name ? : ns_ops->name;
+		res = snprintf(buf, size, "%s:[%u]", name, ns->inum);
 		ns_ops->put(ns);
 	}
 	return res;
diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
index 12cb8bd81d2d..88dba3b53375 100644
--- a/include/linux/proc_ns.h
+++ b/include/linux/proc_ns.h
@@ -14,6 +14,7 @@ struct inode;
 
 struct proc_ns_operations {
 	const char *name;
+	const char *real_ns_name;
 	int type;
 	struct ns_common *(*get)(struct task_struct *task);
 	void (*put)(struct ns_common *ns);