root/fs/nfs/sysctl.c

DEFINITIONS

1. nfs_register_sysctl
2. nfs_unregister_sysctl

/*
 * 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/nfs4.h>
#include <linux/nfs_idmap.h>
#include <linux/nfs_fs.h>

#include "callback.h"

static const int nfs_set_port_min = 0;
static const int nfs_set_port_max = 65535;
static struct ctl_table_header *nfs_callback_sysctl_table;

static ctl_table nfs_cb_sysctls[] = {
#ifdef CONFIG_NFS_V4
        {
                .ctl_name = CTL_UNNUMBERED,
                .procname = "nfs_callback_tcpport",
                .data = &nfs_callback_set_tcpport,
                .maxlen = sizeof(int),
                .mode = 0644,
                .proc_handler = &proc_dointvec_minmax,
                .extra1 = (int *)&nfs_set_port_min,
                .extra2 = (int *)&nfs_set_port_max,
        },
        {
                .ctl_name = CTL_UNNUMBERED,
                .procname = "idmap_cache_timeout",
                .data = &nfs_idmap_cache_timeout,
                .maxlen = sizeof(int),
                .mode = 0644,
                .proc_handler = &proc_dointvec_jiffies,
                .strategy = &sysctl_jiffies,
        },
#endif
        {
                .ctl_name       = CTL_UNNUMBERED,
                .procname       = "nfs_mountpoint_timeout",
                .data           = &nfs_mountpoint_expiry_timeout,
                .maxlen         = sizeof(nfs_mountpoint_expiry_timeout),
                .mode           = 0644,
                .proc_handler   = &proc_dointvec_jiffies,
                .strategy       = &sysctl_jiffies,
        },
        {
                .ctl_name       = CTL_UNNUMBERED,
                .procname       = "nfs_congestion_kb",
                .data           = &nfs_congestion_kb,
                .maxlen         = sizeof(nfs_congestion_kb),
                .mode           = 0644,
                .proc_handler   = &proc_dointvec,
        },
        { .ctl_name = 0 }
};

static ctl_table nfs_cb_sysctl_dir[] = {
        {
                .ctl_name = CTL_UNNUMBERED,
                .procname = "nfs",
                .mode = 0555,
                .child = nfs_cb_sysctls,
        },
        { .ctl_name = 0 }
};

static ctl_table nfs_cb_sysctl_root[] = {
        {
                .ctl_name = CTL_FS,
                .procname = "fs",
                .mode = 0555,
                .child = nfs_cb_sysctl_dir,
        },
        { .ctl_name = 0 }
};

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;
}