/*
 * 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>
#include "xfs_error.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,
        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, buffer, lenp, ppos);

        if (!ret && write && *valp) {
                xfs_notice(NULL, "Clearing xfsstats");
                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;
}

STATIC int
xfs_panic_mask_proc_handler(
        ctl_table       *ctl,
        int             write,
        void            __user *buffer,
        size_t          *lenp,
        loff_t          *ppos)
{
        int             ret, *valp = ctl->data;

        ret = proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
        if (!ret && write) {
                xfs_panic_mask = *valp;
#ifdef DEBUG
                xfs_panic_mask |= (XFS_PTAG_SHUTDOWN_CORRUPT | XFS_PTAG_LOGRES);
#endif
        }
        return ret;
}
#endif /* CONFIG_PROC_FS */

static ctl_table xfs_table[] = {
        {
                .procname       = "irix_sgid_inherit",
                .data           = &xfs_params.sgid_inherit.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.sgid_inherit.min,
                .extra2         = &xfs_params.sgid_inherit.max
        },
        {
                .procname       = "irix_symlink_mode",
                .data           = &xfs_params.symlink_mode.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.symlink_mode.min,
                .extra2         = &xfs_params.symlink_mode.max
        },
        {
                .procname       = "panic_mask",
                .data           = &xfs_params.panic_mask.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = xfs_panic_mask_proc_handler,
                .extra1         = &xfs_params.panic_mask.min,
                .extra2         = &xfs_params.panic_mask.max
        },

        {
                .procname       = "error_level",
                .data           = &xfs_params.error_level.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.error_level.min,
                .extra2         = &xfs_params.error_level.max
        },
        {
                .procname       = "xfssyncd_centisecs",
                .data           = &xfs_params.syncd_timer.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.syncd_timer.min,
                .extra2         = &xfs_params.syncd_timer.max
        },
        {
                .procname       = "inherit_sync",
                .data           = &xfs_params.inherit_sync.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.inherit_sync.min,
                .extra2         = &xfs_params.inherit_sync.max
        },
        {
                .procname       = "inherit_nodump",
                .data           = &xfs_params.inherit_nodump.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.inherit_nodump.min,
                .extra2         = &xfs_params.inherit_nodump.max
        },
        {
                .procname       = "inherit_noatime",
                .data           = &xfs_params.inherit_noatim.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.inherit_noatim.min,
                .extra2         = &xfs_params.inherit_noatim.max
        },
        {
                .procname       = "xfsbufd_centisecs",
                .data           = &xfs_params.xfs_buf_timer.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.xfs_buf_timer.min,
                .extra2         = &xfs_params.xfs_buf_timer.max
        },
        {
                .procname       = "age_buffer_centisecs",
                .data           = &xfs_params.xfs_buf_age.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.xfs_buf_age.min,
                .extra2         = &xfs_params.xfs_buf_age.max
        },
        {
                .procname       = "inherit_nosymlinks",
                .data           = &xfs_params.inherit_nosym.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.inherit_nosym.min,
                .extra2         = &xfs_params.inherit_nosym.max
        },
        {
                .procname       = "rotorstep",
                .data           = &xfs_params.rotorstep.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.rotorstep.min,
                .extra2         = &xfs_params.rotorstep.max
        },
        {
                .procname       = "inherit_nodefrag",
                .data           = &xfs_params.inherit_nodfrg.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.inherit_nodfrg.min,
                .extra2         = &xfs_params.inherit_nodfrg.max
        },
        {
                .procname       = "filestream_centisecs",
                .data           = &xfs_params.fstrm_timer.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.fstrm_timer.min,
                .extra2         = &xfs_params.fstrm_timer.max,
        },
        /* please keep this the last entry */
#ifdef CONFIG_PROC_FS
        {
                .procname       = "stats_clear",
                .data           = &xfs_params.stats_clear.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = xfs_stats_clear_proc_handler,
                .extra1         = &xfs_params.stats_clear.min,
                .extra2         = &xfs_params.stats_clear.max
        },
#endif /* CONFIG_PROC_FS */

        {}
};

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

static ctl_table xfs_root_table[] = {
        {
                .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);
}