// SPDX-License-Identifier: GPL-2.0/* * 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_tnlm_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_tnlm_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 proc_ops lockd_end_grace_proc_ops = {	.proc_write	= nlm_end_grace_write,	.proc_read	= nlm_end_grace_read,	.proc_lseek	= default_llseek,	.proc_release	= simple_transaction_release,}; int __initlockd_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_proc_ops);	if (!entry) {		remove_proc_entry("fs/lockd", NULL);		return -ENOMEM;	}	return 0;} void __exitlockd_remove_procfs(void){	remove_proc_entry("fs/lockd/nlm_end_grace", NULL);	remove_proc_entry("fs/lockd", NULL);}