mirror of https://gitee.com/openkylin/linux.git
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Procfs support for lockd
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*
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* Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
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*/
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/nsproxy.h>
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#include <net/net_namespace.h>
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#include "netns.h"
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#include "procfs.h"
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/*
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* We only allow strings that start with 'Y', 'y', or '1'.
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*/
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static ssize_t
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nlm_end_grace_write(struct file *file, const char __user *buf, size_t size,
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loff_t *pos)
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{
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char *data;
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struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
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lockd_net_id);
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if (size < 1)
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return -EINVAL;
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data = simple_transaction_get(file, buf, size);
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if (IS_ERR(data))
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return PTR_ERR(data);
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switch(data[0]) {
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case 'Y':
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case 'y':
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case '1':
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locks_end_grace(&ln->lockd_manager);
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break;
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default:
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return -EINVAL;
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}
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return size;
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}
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static ssize_t
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nlm_end_grace_read(struct file *file, char __user *buf, size_t size,
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loff_t *pos)
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{
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struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
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lockd_net_id);
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char resp[3];
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resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N';
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resp[1] = '\n';
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resp[2] = '\0';
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return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp));
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}
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static const struct proc_ops lockd_end_grace_proc_ops = {
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.proc_write = nlm_end_grace_write,
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.proc_read = nlm_end_grace_read,
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.proc_lseek = default_llseek,
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.proc_release = simple_transaction_release,
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};
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int __init
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lockd_create_procfs(void)
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{
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struct proc_dir_entry *entry;
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entry = proc_mkdir("fs/lockd", NULL);
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if (!entry)
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return -ENOMEM;
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entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry,
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&lockd_end_grace_proc_ops);
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if (!entry) {
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remove_proc_entry("fs/lockd", NULL);
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return -ENOMEM;
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}
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return 0;
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}
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void __exit
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lockd_remove_procfs(void)
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{
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remove_proc_entry("fs/lockd/nlm_end_grace", NULL);
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remove_proc_entry("fs/lockd", NULL);
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}
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