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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
* sysctl . c - Code for sysctl handling in NTFS Linux kernel driver . Part of
* the Linux - NTFS project . Adapted from the old NTFS driver ,
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* Copyright ( C ) 1997 Martin von Löwis , Régis Duchesne
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*
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* Copyright ( c ) 2002 - 2005 Anton Altaparmakov
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*/
# 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. */
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static struct ctl_table ntfs_sysctls [ ] = {
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{
. procname = " ntfs-debug " ,
. data = & debug_msgs , /* Data pointer and size. */
. maxlen = sizeof ( debug_msgs ) ,
. mode = 0644 , /* Mode, proc handler. */
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. proc_handler = proc_dointvec
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} ,
{ }
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} ;
/* Define the parent directory /proc/sys/fs. */
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static struct ctl_table sysctls_root [ ] = {
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{
. procname = " fs " ,
. mode = 0555 ,
. child = ntfs_sysctls
} ,
{ }
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} ;
/* Storage for the sysctls header. */
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static struct ctl_table_header * sysctls_root_table ;
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/**
* 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 ) ;
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sysctls_root_table = register_sysctl_table ( sysctls_root ) ;
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if ( ! sysctls_root_table )
return - ENOMEM ;
} else {
BUG_ON ( ! sysctls_root_table ) ;
unregister_sysctl_table ( sysctls_root_table ) ;
sysctls_root_table = NULL ;
}
return 0 ;
}
# endif /* CONFIG_SYSCTL */
# endif /* DEBUG */