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[RFC,3/5] fs: add put_mnt_ns() cleanup helper

Message ID 20240719-work-mount-namespace-v1-3-834113cab0d2@kernel.org (mailing list archive)
State New
Headers show
Series nsfs: iterate through mount namespaces | expand

Commit Message

Christian Brauner July 19, 2024, 11:41 a.m. UTC 
Add a simple helper to put a mount namespace reference.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 include/linux/mnt_namespace.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h
index 8f882f5881e8..70b366b64816 100644
--- a/include/linux/mnt_namespace.h
+++ b/include/linux/mnt_namespace.h
@@ -3,6 +3,9 @@ 
 #define _NAMESPACE_H_
 #ifdef __KERNEL__
 
+#include <linux/cleanup.h>
+#include <linux/err.h>
+
 struct mnt_namespace;
 struct fs_struct;
 struct user_namespace;
@@ -11,6 +14,7 @@  struct ns_common;
 extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
 		struct user_namespace *, struct fs_struct *);
 extern void put_mnt_ns(struct mnt_namespace *ns);
+DEFINE_FREE(put_mnt_ns, struct mnt_namespace *, if (!IS_ERR_OR_NULL(_T)) put_mnt_ns(_T))
 extern struct ns_common *from_mnt_ns(struct mnt_namespace *);
 
 extern const struct file_operations proc_mounts_operations;