xfs_sysctl.c

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/*
 * 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);
}