linux-kernel - [PATCH 2/5] sysctl: remove useless ctl

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Date:	Fri,  4 Feb 2011 06:37:05 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Octavian Purdila <opurdila@...acom.com>
Cc:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Subject: [PATCH 2/5] sysctl: remove useless ctl_table->parent field

The 'parent' field was added for selinux in:
    commit d912b0cc1a617d7c590d57b7ea971d50c7f02503
    [PATCH] sysctl: add a parent entry to ctl_table and set the parent entry

and then was used for sysctl_check_table.

Both of the users have found other implementations.

CC: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
---
 include/linux/sysctl.h |    1 -
 kernel/sysctl.c        |   11 -----------
 kernel/sysctl_check.c  |    4 ++--
 3 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 7bb5cb6..1f1da4b 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1018,7 +1018,6 @@ struct ctl_table
 	int maxlen;
 	mode_t mode;
 	struct ctl_table *child;
-	struct ctl_table *parent;	/* Automatically set */
 	proc_handler *proc_handler;	/* Callback for text formatting */
 	void *extra1;
 	void *extra2;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 56f6fc1..42025ec 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1695,18 +1695,8 @@ int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
 	return test_perm(mode, op);
 }
 
-static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
-{
-	for (; table->procname; table++) {
-		table->parent = parent;
-		if (table->child)
-			sysctl_set_parent(table, table->child);
-	}
-}
-
 static __init int sysctl_init(void)
 {
-	sysctl_set_parent(NULL, root_table);
 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
 	sysctl_check_table(current->nsproxy, root_table);
 #endif
@@ -1864,7 +1854,6 @@ struct ctl_table_header *__register_sysctl_paths(
 	header->used = 0;
 	header->unregistering = NULL;
 	header->root = root;
-	sysctl_set_parent(NULL, header->ctl_table);
 	header->count = 1;
 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
 	if (sysctl_check_table(namespaces, header->ctl_table)) {
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index 9b4fecd..b7d9c66 100644
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -95,8 +95,8 @@ static int __sysctl_check_table(struct nsproxy *namespaces,
 	for (; table->procname; table++) {
 		const char *fail = NULL;
 
-		if (table->parent) {
-			if (table->procname && !table->parent->procname)
+		if (depth != 0) { /* has parent */
+			if (table->procname && !parents[depth - 1]->procname)
 				SET_FAIL("Parent without procname");
 		}
 		if (!table->procname)
-- 
1.7.4.rc1.7.g2cf08.dirty

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