sysctl.c

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/*
 * linux/fs/nfs/sysctl.c
 *
 * Sysctl interface to NFS parameters
 */
#include <linux/types.h>
#include <linux/linkage.h>
#include <linux/ctype.h>
#include <linux/fs.h>
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/nfs_fs.h>

static struct ctl_table_header *nfs_callback_sysctl_table;

static ctl_table nfs_cb_sysctls[] = {
    {
        .procname   = "nfs_mountpoint_timeout",
        .data       = &nfs_mountpoint_expiry_timeout,
        .maxlen     = sizeof(nfs_mountpoint_expiry_timeout),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_jiffies,
    },
    {
        .procname   = "nfs_congestion_kb",
        .data       = &nfs_congestion_kb,
        .maxlen     = sizeof(nfs_congestion_kb),
        .mode       = 0644,
        .proc_handler   = proc_dointvec,
    },
    { }
};

static ctl_table nfs_cb_sysctl_dir[] = {
    {
        .procname = "nfs",
        .mode = 0555,
        .child = nfs_cb_sysctls,
    },
    { }
};

static ctl_table nfs_cb_sysctl_root[] = {
    {
        .procname = "fs",
        .mode = 0555,
        .child = nfs_cb_sysctl_dir,
    },
    { }
};

int nfs_register_sysctl(void)
{
    nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
    if (nfs_callback_sysctl_table == NULL)
        return -ENOMEM;
    return 0;
}

void nfs_unregister_sysctl(void)
{
    unregister_sysctl_table(nfs_callback_sysctl_table);
    nfs_callback_sysctl_table = NULL;
}