// SPDX-License-Identifier: GPL-2.0-only/* * linux/net/sunrpc/sysctl.c * * Sysctl interface to sunrpc module. * * I would prefer to register the sunrpc table below sys/net, but that's * impossible at the moment. */ #include <linux/types.h>#include <linux/linkage.h>#include <linux/ctype.h>#include <linux/fs.h>#include <linux/sysctl.h>#include <linux/module.h> #include <linux/uaccess.h>#include <linux/sunrpc/types.h>#include <linux/sunrpc/sched.h>#include <linux/sunrpc/stats.h>#include <linux/sunrpc/svc_xprt.h> #include "netns.h" /* * Declare the debug flags here */unsigned int	rpc_debug;EXPORT_SYMBOL_GPL(rpc_debug); unsigned int	nfs_debug;EXPORT_SYMBOL_GPL(nfs_debug); unsigned int	nfsd_debug;EXPORT_SYMBOL_GPL(nfsd_debug); unsigned int	nlm_debug;EXPORT_SYMBOL_GPL(nlm_debug); #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) static int proc_do_xprt(const struct ctl_table *table, int write,			void *buffer, size_t *lenp, loff_t *ppos){	char tmpbuf[256];	ssize_t len; 	if (write || *ppos) {		*lenp = 0;		return 0;	}	len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));	len = memory_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); 	if (len < 0) {		*lenp = 0;		return -EINVAL;	}	*lenp = len;	return 0;} static intproc_dodebug(const struct ctl_table *table, int write, void *buffer, size_t *lenp,	     loff_t *ppos){	char		tmpbuf[20], *s = NULL;	char *p;	unsigned int	value;	size_t		left, len; 	if ((*ppos && !write) || !*lenp) {		*lenp = 0;		return 0;	} 	left = *lenp; 	if (write) {		p = buffer;		while (left && isspace(*p)) {			left--;			p++;		}		if (!left)			goto done; 		if (left > sizeof(tmpbuf) - 1)			return -EINVAL;		memcpy(tmpbuf, p, left);		tmpbuf[left] = '\0'; 		value = simple_strtol(tmpbuf, &s, 0);		if (s) {			left -= (s - tmpbuf);			if (left && !isspace(*s))				return -EINVAL;			while (left && isspace(*s)) {				left--;				s++;			}		} else			left = 0;		*(unsigned int *) table->data = value;		/* Display the RPC tasks on writing to rpc_debug */		if (strcmp(table->procname, "rpc_debug") == 0)			rpc_show_tasks(&init_net);	} else {		len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);		if (len > left)			len = left;		memcpy(buffer, tmpbuf, len);		if ((left -= len) > 0) {			*((char *)buffer + len) = '\n';			left--;		}	} done:	*lenp -= left;	*ppos += *lenp;	return 0;} static struct ctl_table_header *sunrpc_table_header; static struct ctl_table debug_table[] = {	{		.procname	= "rpc_debug",		.data		= &rpc_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= proc_dodebug	},	{		.procname	= "nfs_debug",		.data		= &nfs_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= proc_dodebug	},	{		.procname	= "nfsd_debug",		.data		= &nfsd_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= proc_dodebug	},	{		.procname	= "nlm_debug",		.data		= &nlm_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= proc_dodebug	},	{		.procname	= "transports",		.maxlen		= 256,		.mode		= 0444,		.proc_handler	= proc_do_xprt,	},}; voidrpc_register_sysctl(void){	if (!sunrpc_table_header)		sunrpc_table_header = register_sysctl("sunrpc", debug_table);} voidrpc_unregister_sysctl(void){	if (sunrpc_table_header) {		unregister_sysctl_table(sunrpc_table_header);		sunrpc_table_header = NULL;	}}#endif