alistair23-linux/fs/xfs/linux-2.6/xfs_sysctl.c

/*
 * Copyright (c) 2001-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program 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.
 *
 * This program is distributed in the hope that it would 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; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include <linux/sysctl.h>
#include <linux/proc_fs.h>

static struct ctl_table_header *xfs_table_header;

#ifdef CONFIG_PROC_FS
STATIC int
xfs_stats_clear_proc_handler(
	ctl_table	*ctl,
	int		write,
	struct file	*filp,
	void		__user *buffer,
	size_t		*lenp,
	loff_t		*ppos)
{
	int		c, ret, *valp = ctl->data;
	__uint32_t	vn_active;

	ret = proc_dointvec_minmax(ctl, write, filp, buffer, lenp, ppos);

	if (!ret && write && *valp) {
		printk("XFS Clearing xfsstats\n");
		for_each_possible_cpu(c) {
			preempt_disable();
			/* save vn_active, it's a universal truth! */
			vn_active = per_cpu(xfsstats, c).vn_active;
			memset(&per_cpu(xfsstats, c), 0,
			       sizeof(struct xfsstats));
			per_cpu(xfsstats, c).vn_active = vn_active;
			preempt_enable();
		}
		xfs_stats_clear = 0;
	}

	return ret;
}
#endif /* CONFIG_PROC_FS */

static ctl_table xfs_table[] = {
	{
		.ctl_name	= XFS_RESTRICT_CHOWN,
		.procname	= "restrict_chown",
		.data		= &xfs_params.restrict_chown.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.restrict_chown.min,
		.extra2		= &xfs_params.restrict_chown.max
	},
	{
		.ctl_name	= XFS_SGID_INHERIT,
		.procname	= "irix_sgid_inherit",
		.data		= &xfs_params.sgid_inherit.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.sgid_inherit.min,
		.extra2		= &xfs_params.sgid_inherit.max
	},
	{
		.ctl_name	= XFS_SYMLINK_MODE,
		.procname	= "irix_symlink_mode",
		.data		= &xfs_params.symlink_mode.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.symlink_mode.min,
		.extra2		= &xfs_params.symlink_mode.max
	},
	{
		.ctl_name	= XFS_PANIC_MASK,
		.procname	= "panic_mask",
		.data		= &xfs_params.panic_mask.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.panic_mask.min,
		.extra2		= &xfs_params.panic_mask.max
	},

	{
		.ctl_name	= XFS_ERRLEVEL,
		.procname	= "error_level",
		.data		= &xfs_params.error_level.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.error_level.min,
		.extra2		= &xfs_params.error_level.max
	},
	{
		.ctl_name	= XFS_SYNCD_TIMER,
		.procname	= "xfssyncd_centisecs",
		.data		= &xfs_params.syncd_timer.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.syncd_timer.min,
		.extra2		= &xfs_params.syncd_timer.max
	},
	{
		.ctl_name	= XFS_INHERIT_SYNC,
		.procname	= "inherit_sync",
		.data		= &xfs_params.inherit_sync.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.inherit_sync.min,
		.extra2		= &xfs_params.inherit_sync.max
	},
	{
		.ctl_name	= XFS_INHERIT_NODUMP,
		.procname	= "inherit_nodump",
		.data		= &xfs_params.inherit_nodump.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.inherit_nodump.min,
		.extra2		= &xfs_params.inherit_nodump.max
	},
	{
		.ctl_name	= XFS_INHERIT_NOATIME,
		.procname	= "inherit_noatime",
		.data		= &xfs_params.inherit_noatim.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.inherit_noatim.min,
		.extra2		= &xfs_params.inherit_noatim.max
	},
	{
		.ctl_name	= XFS_BUF_TIMER,
		.procname	= "xfsbufd_centisecs",
		.data		= &xfs_params.xfs_buf_timer.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.xfs_buf_timer.min,
		.extra2		= &xfs_params.xfs_buf_timer.max
	},
	{
		.ctl_name	= XFS_BUF_AGE,
		.procname	= "age_buffer_centisecs",
		.data		= &xfs_params.xfs_buf_age.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.xfs_buf_age.min,
		.extra2		= &xfs_params.xfs_buf_age.max
	},
	{
		.ctl_name	= XFS_INHERIT_NOSYM,
		.procname	= "inherit_nosymlinks",
		.data		= &xfs_params.inherit_nosym.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.inherit_nosym.min,
		.extra2		= &xfs_params.inherit_nosym.max
	},
	{
		.ctl_name	= XFS_ROTORSTEP,
		.procname	= "rotorstep",
		.data		= &xfs_params.rotorstep.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.rotorstep.min,
		.extra2		= &xfs_params.rotorstep.max
	},
	{
		.ctl_name	= XFS_INHERIT_NODFRG,
		.procname	= "inherit_nodefrag",
		.data		= &xfs_params.inherit_nodfrg.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.inherit_nodfrg.min,
		.extra2		= &xfs_params.inherit_nodfrg.max
	},
	/* please keep this the last entry */
#ifdef CONFIG_PROC_FS
	{
		.ctl_name	= XFS_STATS_CLEAR,
		.procname	= "stats_clear",
		.data		= &xfs_params.stats_clear.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &xfs_stats_clear_proc_handler,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.stats_clear.min,
		.extra2		= &xfs_params.stats_clear.max
	},
#endif /* CONFIG_PROC_FS */

	{}
};

static ctl_table xfs_dir_table[] = {
	{
		.ctl_name	= FS_XFS,
		.procname	= "xfs",
		.mode		= 0555,
		.child		= xfs_table
	},
	{}
};

static ctl_table xfs_root_table[] = {
	{
		.ctl_name	= CTL_FS,
		.procname	= "fs",
		.mode		= 0555,
		.child		= xfs_dir_table
	},
	{}
};

void
xfs_sysctl_register(void)
{
	xfs_table_header = register_sysctl_table(xfs_root_table);
}

void
xfs_sysctl_unregister(void)
{
	if (xfs_table_header)
		unregister_sysctl_table(xfs_table_header);
}