1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Procfs support for lockd
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/fs.h>
9*4882a593Smuzhiyun #include <linux/proc_fs.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/nsproxy.h>
12*4882a593Smuzhiyun #include <net/net_namespace.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "netns.h"
15*4882a593Smuzhiyun #include "procfs.h"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /*
18*4882a593Smuzhiyun * We only allow strings that start with 'Y', 'y', or '1'.
19*4882a593Smuzhiyun */
20*4882a593Smuzhiyun static ssize_t
nlm_end_grace_write(struct file * file,const char __user * buf,size_t size,loff_t * pos)21*4882a593Smuzhiyun nlm_end_grace_write(struct file *file, const char __user *buf, size_t size,
22*4882a593Smuzhiyun loff_t *pos)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun char *data;
25*4882a593Smuzhiyun struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
26*4882a593Smuzhiyun lockd_net_id);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun if (size < 1)
29*4882a593Smuzhiyun return -EINVAL;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun data = simple_transaction_get(file, buf, size);
32*4882a593Smuzhiyun if (IS_ERR(data))
33*4882a593Smuzhiyun return PTR_ERR(data);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun switch(data[0]) {
36*4882a593Smuzhiyun case 'Y':
37*4882a593Smuzhiyun case 'y':
38*4882a593Smuzhiyun case '1':
39*4882a593Smuzhiyun locks_end_grace(&ln->lockd_manager);
40*4882a593Smuzhiyun break;
41*4882a593Smuzhiyun default:
42*4882a593Smuzhiyun return -EINVAL;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun return size;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun static ssize_t
nlm_end_grace_read(struct file * file,char __user * buf,size_t size,loff_t * pos)49*4882a593Smuzhiyun nlm_end_grace_read(struct file *file, char __user *buf, size_t size,
50*4882a593Smuzhiyun loff_t *pos)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
53*4882a593Smuzhiyun lockd_net_id);
54*4882a593Smuzhiyun char resp[3];
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N';
57*4882a593Smuzhiyun resp[1] = '\n';
58*4882a593Smuzhiyun resp[2] = '\0';
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp));
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun static const struct proc_ops lockd_end_grace_proc_ops = {
64*4882a593Smuzhiyun .proc_write = nlm_end_grace_write,
65*4882a593Smuzhiyun .proc_read = nlm_end_grace_read,
66*4882a593Smuzhiyun .proc_lseek = default_llseek,
67*4882a593Smuzhiyun .proc_release = simple_transaction_release,
68*4882a593Smuzhiyun };
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun int __init
lockd_create_procfs(void)71*4882a593Smuzhiyun lockd_create_procfs(void)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun struct proc_dir_entry *entry;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun entry = proc_mkdir("fs/lockd", NULL);
76*4882a593Smuzhiyun if (!entry)
77*4882a593Smuzhiyun return -ENOMEM;
78*4882a593Smuzhiyun entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry,
79*4882a593Smuzhiyun &lockd_end_grace_proc_ops);
80*4882a593Smuzhiyun if (!entry) {
81*4882a593Smuzhiyun remove_proc_entry("fs/lockd", NULL);
82*4882a593Smuzhiyun return -ENOMEM;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun return 0;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun void __exit
lockd_remove_procfs(void)88*4882a593Smuzhiyun lockd_remove_procfs(void)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun remove_proc_entry("fs/lockd/nlm_end_grace", NULL);
91*4882a593Smuzhiyun remove_proc_entry("fs/lockd", NULL);
92*4882a593Smuzhiyun }
93