93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
/*
|
|
* Procfs support for lockd
|
|
*
|
|
* Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/module.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <net/net_namespace.h>
|
|
|
|
#include "netns.h"
|
|
#include "procfs.h"
|
|
|
|
/*
|
|
* We only allow strings that start with 'Y', 'y', or '1'.
|
|
*/
|
|
static ssize_t
|
|
nlm_end_grace_write(struct file *file, const char __user *buf, size_t size,
|
|
loff_t *pos)
|
|
{
|
|
char *data;
|
|
struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
|
|
lockd_net_id);
|
|
|
|
if (size < 1)
|
|
return -EINVAL;
|
|
|
|
data = simple_transaction_get(file, buf, size);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
switch(data[0]) {
|
|
case 'Y':
|
|
case 'y':
|
|
case '1':
|
|
locks_end_grace(&ln->lockd_manager);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static ssize_t
|
|
nlm_end_grace_read(struct file *file, char __user *buf, size_t size,
|
|
loff_t *pos)
|
|
{
|
|
struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
|
|
lockd_net_id);
|
|
char resp[3];
|
|
|
|
resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N';
|
|
resp[1] = '\n';
|
|
resp[2] = '\0';
|
|
|
|
return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp));
|
|
}
|
|
|
|
static const struct file_operations lockd_end_grace_operations = {
|
|
.write = nlm_end_grace_write,
|
|
.read = nlm_end_grace_read,
|
|
.llseek = default_llseek,
|
|
.release = simple_transaction_release,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int __init
|
|
lockd_create_procfs(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
entry = proc_mkdir("fs/lockd", NULL);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry,
|
|
&lockd_end_grace_operations);
|
|
if (!entry) {
|
|
remove_proc_entry("fs/lockd", NULL);
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void __exit
|
|
lockd_remove_procfs(void)
|
|
{
|
|
remove_proc_entry("fs/lockd/nlm_end_grace", NULL);
|
|
remove_proc_entry("fs/lockd", NULL);
|
|
}
|