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remove restricted chown parameter from xfs linux

On Linux all filesystems are supposed to be operating under
Posix' restricted chown. Restricted chown means it restricts
chown to the owner unless you have CAP_FOWNER.

NOTE: that 2 files outside of fs/xfs have been modified too
for this change.

Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Merge of xfs-linux-melb:xfs-kern:32413a by kenmcd.

  remove restricted chown parameter from xfs linux

/*
 * 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_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
	},
	{
		.ctl_name	= XFS_FILESTREAM_TIMER,
		.procname	= "filestream_centisecs",
		.data		= &xfs_params.fstrm_timer.val,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &xfs_params.fstrm_timer.min,
		.extra2		= &xfs_params.fstrm_timer.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
	},
	{}
};

int
xfs_sysctl_register(void)
{
	xfs_table_header = register_sysctl_table(xfs_root_table);
	if (!xfs_table_header)
		return -ENOMEM;
	return 0;
}

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