// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2001-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs_platform.h"
#include "xfs_error.h"

static struct ctl_table_header *xfs_table_header;

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

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

        if (!ret && write && *valp) {
                xfs_stats_clearall(xfsstats.xs_stats);
                xfs_stats_clear = 0;
        }

        return ret;
}

STATIC int
xfs_panic_mask_proc_handler(
        const struct ctl_table  *ctl,
        int                     write,
        void                    *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 inline int
xfs_deprecated_dointvec_minmax(
        const struct ctl_table  *ctl,
        int                     write,
        void                    *buffer,
        size_t                  *lenp,
        loff_t                  *ppos)
{
        if (write) {
                printk_ratelimited(KERN_WARNING
                                "XFS: %s sysctl option is deprecated.\n",
                                ctl->procname);
        }
        return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
}

static const struct ctl_table xfs_table[] = {
        {
                .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       = "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,
        },
        {
                .procname       = "speculative_prealloc_lifetime",
                .data           = &xfs_params.blockgc_timer.val,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_minmax,
                .extra1         = &xfs_params.blockgc_timer.min,
                .extra2         = &xfs_params.blockgc_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 */
};

int
xfs_sysctl_register(void)
{
        xfs_table_header = register_sysctl("fs/xfs", xfs_table);
        if (!xfs_table_header)
                return -ENOMEM;
        return 0;
}

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