0b4d414714
The semantic effect of insert_at_head is that it would allow new registered sysctl entries to override existing sysctl entries of the same name. Which is pain for caching and the proc interface never implemented. I have done an audit and discovered that none of the current users of register_sysctl care as (excpet for directories) they do not register duplicate sysctl entries. So this patch simply removes the support for overriding existing entries in the sys_sysctl interface since no one uses it or cares and it makes future enhancments harder. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Andi Kleen <ak@muc.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Corey Minyard <minyard@acm.org> Cc: Neil Brown <neilb@suse.de> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jan Kara <jack@ucw.cz> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Mark Fasheh <mark.fasheh@oracle.com> Cc: David Chinner <dgc@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
|
|
* sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
|
|
* the Linux-NTFS project. Adapted from the old NTFS driver,
|
|
* Copyright (C) 1997 Martin von Löwis, Régis Duchesne
|
|
*
|
|
* Copyright (c) 2002-2005 Anton Altaparmakov
|
|
*
|
|
* This program/include file is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program/include file is distributed in the hope that it will be
|
|
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (in the main directory of the Linux-NTFS
|
|
* distribution in the file COPYING); if not, write to the Free Software
|
|
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifdef DEBUG
|
|
|
|
#include <linux/module.h>
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/sysctl.h>
|
|
|
|
#include "sysctl.h"
|
|
#include "debug.h"
|
|
|
|
/* Definition of the ntfs sysctl. */
|
|
static ctl_table ntfs_sysctls[] = {
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED, /* Binary and text IDs. */
|
|
.procname = "ntfs-debug",
|
|
.data = &debug_msgs, /* Data pointer and size. */
|
|
.maxlen = sizeof(debug_msgs),
|
|
.mode = 0644, /* Mode, proc handler. */
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{}
|
|
};
|
|
|
|
/* Define the parent directory /proc/sys/fs. */
|
|
static ctl_table sysctls_root[] = {
|
|
{
|
|
.ctl_name = CTL_FS,
|
|
.procname = "fs",
|
|
.mode = 0555,
|
|
.child = ntfs_sysctls
|
|
},
|
|
{}
|
|
};
|
|
|
|
/* Storage for the sysctls header. */
|
|
static struct ctl_table_header *sysctls_root_table = NULL;
|
|
|
|
/**
|
|
* ntfs_sysctl - add or remove the debug sysctl
|
|
* @add: add (1) or remove (0) the sysctl
|
|
*
|
|
* Add or remove the debug sysctl. Return 0 on success or -errno on error.
|
|
*/
|
|
int ntfs_sysctl(int add)
|
|
{
|
|
if (add) {
|
|
BUG_ON(sysctls_root_table);
|
|
sysctls_root_table = register_sysctl_table(sysctls_root);
|
|
if (!sysctls_root_table)
|
|
return -ENOMEM;
|
|
#ifdef CONFIG_PROC_FS
|
|
/*
|
|
* If the proc filesystem is in use and we are a module, need
|
|
* to set the owner of our proc entry to our module. In the
|
|
* non-modular case, THIS_MODULE is NULL, so this is ok.
|
|
*/
|
|
ntfs_sysctls[0].de->owner = THIS_MODULE;
|
|
#endif
|
|
} else {
|
|
BUG_ON(!sysctls_root_table);
|
|
unregister_sysctl_table(sysctls_root_table);
|
|
sysctls_root_table = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SYSCTL */
|
|
#endif /* DEBUG */
|