// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/fuse/fuse_sysctl.c
 *
 * Sysctl interface to fuse parameters
 */
#include <linux/sysctl.h>

#include "fuse_i.h"

static struct ctl_table_header *fuse_table_header;

/* Bound by fuse_init_out max_pages, which is a u16 */
static unsigned int sysctl_fuse_max_pages_limit = 65535;

/*
 * fuse_init_out request timeouts are u16.
 * This goes up to ~18 hours, which is plenty for a timeout.
 */
static unsigned int sysctl_fuse_req_timeout_limit = 65535;

static const struct ctl_table fuse_sysctl_table[] = {
        {
                .procname       = "max_pages_limit",
                .data           = &fuse_max_pages_limit,
                .maxlen         = sizeof(fuse_max_pages_limit),
                .mode           = 0644,
                .proc_handler   = proc_douintvec_minmax,
                .extra1         = SYSCTL_ONE,
                .extra2         = &sysctl_fuse_max_pages_limit,
        },
        {
                .procname       = "default_request_timeout",
                .data           = &fuse_default_req_timeout,
                .maxlen         = sizeof(fuse_default_req_timeout),
                .mode           = 0644,
                .proc_handler   = proc_douintvec_minmax,
                .extra1         = SYSCTL_ZERO,
                .extra2         = &sysctl_fuse_req_timeout_limit,
        },
        {
                .procname       = "max_request_timeout",
                .data           = &fuse_max_req_timeout,
                .maxlen         = sizeof(fuse_max_req_timeout),
                .mode           = 0644,
                .proc_handler   = proc_douintvec_minmax,
                .extra1         = SYSCTL_ZERO,
                .extra2         = &sysctl_fuse_req_timeout_limit,
        },
};

int fuse_sysctl_register(void)
{
        fuse_table_header = register_sysctl("fs/fuse", fuse_sysctl_table);
        if (!fuse_table_header)
                return -ENOMEM;
        return 0;
}

void fuse_sysctl_unregister(void)
{
        unregister_sysctl_table(fuse_table_header);
        fuse_table_header = NULL;
}