[PATCH 5.10.y 2/4] ns: uniformly initialize ns_common

[Sasha Levin <sashal@kernel.org>]

From: Christian Brauner <brauner@kernel.org>

[ Upstream commit 660def10b01b248fd97255afacb7b0e305ac833a ]

No point in cargo-culting the same code across all the different types.
Use one common initializer.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: 7812d6dab069 ("bootconfig: Fix integer overflow in initrd size check")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/linux/proc_ns.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
index 75807ecef880f..5ea4835550823 100644
--- a/include/linux/proc_ns.h
+++ b/include/linux/proc_ns.h
@@ -70,6 +70,22 @@ static inline int ns_alloc_inum(struct ns_common *ns)
 	return proc_alloc_inum(&ns->inum);
 }
 
+static inline int ns_common_init(struct ns_common *ns,
+				 const struct proc_ns_operations *ops,
+				 bool alloc_inum)
+{
+	if (alloc_inum) {
+		int ret;
+		ret = proc_alloc_inum(&ns->inum);
+		if (ret)
+			return ret;
+	}
+	refcount_set(&ns->count, 1);
+	ns->stashed = NULL;
+	ns->ops = ops;
+	return 0;
+}
+
 #define ns_free_inum(ns) proc_free_inum((ns)->inum)
 
 extern struct file *proc_ns_fget(int fd);
-- 
2.53.0