/* * 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 <asm/uaccess.h>#include <linux/sunrpc/types.h>#include <linux/sunrpc/sched.h>#include <linux/sunrpc/stats.h> /* * Declare the debug flags here */unsigned int	rpc_debug;unsigned int	nfs_debug;unsigned int	nfsd_debug;unsigned int	nlm_debug; #ifdef RPC_DEBUG static struct ctl_table_header *sunrpc_table_header;static ctl_table		sunrpc_table[]; voidrpc_register_sysctl(void){	if (!sunrpc_table_header)		sunrpc_table_header = register_sysctl_table(sunrpc_table);} voidrpc_unregister_sysctl(void){	if (sunrpc_table_header) {		unregister_sysctl_table(sunrpc_table_header);		sunrpc_table_header = NULL;	}} static intproc_dodebug(ctl_table *table, int write, struct file *file,				void __user *buffer, size_t *lenp, loff_t *ppos){	char		tmpbuf[20], c, *s;	char __user *p;	unsigned int	value;	size_t		left, len; 	if ((*ppos && !write) || !*lenp) {		*lenp = 0;		return 0;	} 	left = *lenp; 	if (write) {		if (!access_ok(VERIFY_READ, buffer, left))			return -EFAULT;		p = buffer;		while (left && __get_user(c, p) >= 0 && isspace(c))			left--, p++;		if (!left)			goto done; 		if (left > sizeof(tmpbuf) - 1)			return -EINVAL;		if (copy_from_user(tmpbuf, p, left))			return -EFAULT;		tmpbuf[left] = '\0'; 		for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)			value = 10 * value + (*s - '0');		if (*s && !isspace(*s))			return -EINVAL;		while (left && isspace(*s))			left--, s++;		*(unsigned int *) table->data = value;		/* Display the RPC tasks on writing to rpc_debug */		if (table->ctl_name == CTL_RPCDEBUG) {			rpc_show_tasks();		}	} else {		if (!access_ok(VERIFY_WRITE, buffer, left))			return -EFAULT;		len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);		if (len > left)			len = left;		if (__copy_to_user(buffer, tmpbuf, len))			return -EFAULT;		if ((left -= len) > 0) {			if (put_user('\n', (char __user *)buffer + len))				return -EFAULT;			left--;		}	} done:	*lenp -= left;	*ppos += *lenp;	return 0;}  static ctl_table debug_table[] = {	{		.ctl_name	= CTL_RPCDEBUG,		.procname	= "rpc_debug",		.data		= &rpc_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= &proc_dodebug	},	{		.ctl_name	= CTL_NFSDEBUG,		.procname	= "nfs_debug",		.data		= &nfs_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= &proc_dodebug	},	{		.ctl_name	= CTL_NFSDDEBUG,		.procname	= "nfsd_debug",		.data		= &nfsd_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= &proc_dodebug	},	{		.ctl_name	= CTL_NLMDEBUG,		.procname	= "nlm_debug",		.data		= &nlm_debug,		.maxlen		= sizeof(int),		.mode		= 0644,		.proc_handler	= &proc_dodebug	},	{ .ctl_name = 0 }}; static ctl_table sunrpc_table[] = {	{		.ctl_name	= CTL_SUNRPC,		.procname	= "sunrpc",		.mode		= 0555,		.child		= debug_table	},	{ .ctl_name = 0 }}; #endif