Commit | Line | Data |
---|---|---|
d68e3c4a JL |
1 | /* |
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 | */ | |
19 | static ssize_t | |
20 | nlm_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 | ||
47 | static ssize_t | |
48 | nlm_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 | ||
62 | static 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 | ||
70 | int __init | |
71 | lockd_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 | ||
87 | void __exit | |
88 | lockd_remove_procfs(void) | |
89 | { | |
90 | remove_proc_entry("fs/lockd/nlm_end_grace", NULL); | |
91 | remove_proc_entry("fs/lockd", NULL); | |
92 | } |