Add register_sysctl_table_path function

From: Olaf Kirch <[email protected]>
Subject: Add register_sysctl_table_path function

There are a number of modules that register a sysctl table somewhere deeply nested in the sysctl hierarchy, such as fs/nfs, fs/xfs, dev/cdrom, etc.

They all specify several dummy ctl_tables for the path name. This patch implements register_sysctl_table_path that takes an additional path name, and makes up dummy sysctl nodes for each component.

 include/linux/sysctl.h |   10 ++++++
 kernel/sysctl.c        |   79 +++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 87 insertions(+), 2 deletions(-)

Index: linux-2.6.18/include/linux/sysctl.h
===================================================================
@@ -1006,8 +1006,18 @@ struct ctl_table_header
 	struct completion *unregistering;
 };
 
+/* struct ctl_path describes where in the hierarchy a table is added */
+struct ctl_path
+{
+	int ctl_name;
+	const char *procname;
+	mode_t mode;
+};
+
 struct ctl_table_header * register_sysctl_table(ctl_table * table, 
 						int insert_at_head);
+struct ctl_table_header * register_sysctl_table_path(ctl_table *table,
+						struct ctl_path *path);
 void unregister_sysctl_table(struct ctl_table_header * table);
 
 #else /* __KERNEL__ */

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