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