sysctl.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * linux/fs/fuse/fuse_sysctl.c
 4 *
 5 * Sysctl interface to fuse parameters
 6 */
 7#include <linux/sysctl.h>
 8
 9#include "fuse_i.h"
10
11static struct ctl_table_header *fuse_table_header;
12
13/* Bound by fuse_init_out max_pages, which is a u16 */
14static unsigned int sysctl_fuse_max_pages_limit = 65535;
15
16/*
17 * fuse_init_out request timeouts are u16.
18 * This goes up to ~18 hours, which is plenty for a timeout.
19 */
20static unsigned int sysctl_fuse_req_timeout_limit = 65535;
21
22static const struct ctl_table fuse_sysctl_table[] = {
23	{
24		.procname	= "max_pages_limit",
25		.data		= &fuse_max_pages_limit,
26		.maxlen		= sizeof(fuse_max_pages_limit),
27		.mode		= 0644,
28		.proc_handler	= proc_douintvec_minmax,
29		.extra1		= SYSCTL_ONE,
30		.extra2		= &sysctl_fuse_max_pages_limit,
31	},
32	{
33		.procname	= "default_request_timeout",
34		.data		= &fuse_default_req_timeout,
35		.maxlen		= sizeof(fuse_default_req_timeout),
36		.mode		= 0644,
37		.proc_handler	= proc_douintvec_minmax,
38		.extra1		= SYSCTL_ZERO,
39		.extra2		= &sysctl_fuse_req_timeout_limit,
40	},
41	{
42		.procname	= "max_request_timeout",
43		.data		= &fuse_max_req_timeout,
44		.maxlen		= sizeof(fuse_max_req_timeout),
45		.mode		= 0644,
46		.proc_handler	= proc_douintvec_minmax,
47		.extra1		= SYSCTL_ZERO,
48		.extra2		= &sysctl_fuse_req_timeout_limit,
49	},
50};
51
52int fuse_sysctl_register(void)
53{
54	fuse_table_header = register_sysctl("fs/fuse", fuse_sysctl_table);
55	if (!fuse_table_header)
56		return -ENOMEM;
57	return 0;
58}
59
60void fuse_sysctl_unregister(void)
61{
62	unregister_sysctl_table(fuse_table_header);
63	fuse_table_header = NULL;
64}