blob: 2a0a98480e39d0d0002f19e373fa4b4b64271d56 [file] [log] [blame]
Jeff Laytond68e3c42014-09-12 16:40:20 -04001/*
2 * Procfs support for lockd
3 *
4 * Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
5 */
6
7#include <linux/fs.h>
8#include <linux/proc_fs.h>
9#include <linux/module.h>
10#include <linux/nsproxy.h>
11#include <net/net_namespace.h>
12
13#include "netns.h"
14#include "procfs.h"
15
16/*
17 * We only allow strings that start with 'Y', 'y', or '1'.
18 */
19static ssize_t
20nlm_end_grace_write(struct file *file, const char __user *buf, size_t size,
21 loff_t *pos)
22{
23 char *data;
24 struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
25 lockd_net_id);
26
27 if (size < 1)
28 return -EINVAL;
29
30 data = simple_transaction_get(file, buf, size);
31 if (IS_ERR(data))
32 return PTR_ERR(data);
33
34 switch(data[0]) {
35 case 'Y':
36 case 'y':
37 case '1':
38 locks_end_grace(&ln->lockd_manager);
39 break;
40 default:
41 return -EINVAL;
42 }
43
44 return size;
45}
46
47static ssize_t
48nlm_end_grace_read(struct file *file, char __user *buf, size_t size,
49 loff_t *pos)
50{
51 struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
52 lockd_net_id);
53 char resp[3];
54
55 resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N';
56 resp[1] = '\n';
57 resp[2] = '\0';
58
59 return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp));
60}
61
62static const struct file_operations lockd_end_grace_operations = {
63 .write = nlm_end_grace_write,
64 .read = nlm_end_grace_read,
65 .llseek = default_llseek,
66 .release = simple_transaction_release,
67 .owner = THIS_MODULE,
68};
69
70int __init
71lockd_create_procfs(void)
72{
73 struct proc_dir_entry *entry;
74
75 entry = proc_mkdir("fs/lockd", NULL);
76 if (!entry)
77 return -ENOMEM;
78 entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry,
79 &lockd_end_grace_operations);
80 if (!entry) {
81 remove_proc_entry("fs/lockd", NULL);
82 return -ENOMEM;
83 }
84 return 0;
85}
86
87void __exit
88lockd_remove_procfs(void)
89{
90 remove_proc_entry("fs/lockd/nlm_end_grace", NULL);
91 remove_proc_entry("fs/lockd", NULL);
92}