linux-kernel - [PATCH 1/2] proc: add a helper for marking files as permanent by external consumers

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Message-ID: <20250329192821.822253-2-mjguzik@gmail.com>
Date: Sat, 29 Mar 2025 20:28:20 +0100
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org
Cc: viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH 1/2] proc: add a helper for marking files as permanent by external consumers

This avoids refing trips on use, added with VFS in mind but should be
helpful elsewhere as well.

Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
---
 fs/proc/generic.c       | 6 ++++++
 include/linux/proc_fs.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index a3e22803cddf..ae86554bb271 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -668,6 +668,12 @@ struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
 }
 EXPORT_SYMBOL(proc_create_single_data);
 
+void proc_make_permanent(struct proc_dir_entry *de)
+{
+	pde_make_permanent(de);
+}
+EXPORT_SYMBOL(proc_make_permanent);
+
 void proc_set_size(struct proc_dir_entry *de, loff_t size)
 {
 	de->size = size;
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index ea62201c74c4..0b6fcef4099a 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -105,6 +105,7 @@ struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
 		int (*show)(struct seq_file *, void *), void *data);
 #define proc_create_single(name, mode, parent, show) \
 	proc_create_single_data(name, mode, parent, show, NULL)
+void proc_make_permanent(struct proc_dir_entry *);
  
 extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
 					       struct proc_dir_entry *,
-- 
2.43.0