nfsd: remove unused listener-removal interfaces

You can use nfsd/portlist to give nfsd additional sockets to listen on.
In theory you can also remove listening sockets this way.  But nobody's
ever done that as far as I can tell.

Also this was partially broken in 2.6.25, by
a217813f "knfsd: Support adding
transports by writing portlist file".

(Note that we decide whether to take the "delfd" case by checking for a
digit--but what's actually expected in that case is something made by
svc_one_sock_name(), which won't begin with a digit.)

So, let's just rip out this stuff.
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfsctl.c

@@ -682,25 +682,6 @@ static ssize_t __write_ports_addfd(char *buf)
 	return err;
 }
 
-/*
- * A '-' followed by the 'name' of a socket means we close the socket.
- */
-static ssize_t __write_ports_delfd(char *buf)
-{
-	char *toclose;
-	int len = 0;
-
-	toclose = kstrdup(buf + 1, GFP_KERNEL);
-	if (toclose == NULL)
-		return -ENOMEM;
-
-	if (nfsd_serv != NULL)
-		len = svc_sock_names(nfsd_serv, buf,
-					SIMPLE_TRANSACTION_LIMIT, toclose);
-	kfree(toclose);
-	return len;
-}
-
 /*
  * A transport listener is added by writing it's transport name and
  * a port number.
@@ -746,31 +727,6 @@ static ssize_t __write_ports_addxprt(char *buf)
 	return err;
 }
 
-/*
- * A transport listener is removed by writing a "-", it's transport
- * name, and it's port number.
- */
-static ssize_t __write_ports_delxprt(char *buf)
-{
-	struct svc_xprt *xprt;
-	char transport[16];
-	int port;
-
-	if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
-		return -EINVAL;
-
-	if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
-		return -EINVAL;
-
-	xprt = svc_find_xprt(nfsd_serv, transport, &init_net, AF_UNSPEC, port);
-	if (xprt == NULL)
-		return -ENOTCONN;
-
-	svc_close_xprt(xprt);
-	svc_xprt_put(xprt);
-	return 0;
-}
-
 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 {
 	if (size == 0)
@@ -779,15 +735,9 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 	if (isdigit(buf[0]))
 		return __write_ports_addfd(buf);
 
-	if (buf[0] == '-' && isdigit(buf[1]))
-		return __write_ports_delfd(buf);
-
 	if (isalpha(buf[0]))
 		return __write_ports_addxprt(buf);
 
-	if (buf[0] == '-' && isalpha(buf[1]))
-		return __write_ports_delxprt(buf);
-
 	return -EINVAL;
 }
 
@@ -825,21 +775,6 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
  * OR
  *
  * Input:
- *			buf:		C string containing a "-" followed
- *					by an integer value representing a
- *					previously passed in socket file
- *					descriptor
- *			size:		non-zero length of C string in @buf
- * Output:
- *	On success:	NFS service no longer listens on that socket;
- *			passed-in buffer filled with a '\n'-terminated C
- *			string containing a unique name of the listener;
- *			return code is the size in bytes of the string
- *	On error:	return code is a negative errno value
- *
- * OR
- *
- * Input:
  *			buf:		C string containing a transport
  *					name and an unsigned integer value
  *					representing the port to listen on,
@@ -848,19 +783,6 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
  * Output:
  *	On success:	returns zero; NFS service is started
  *	On error:	return code is a negative errno value
- *
- * OR
- *
- * Input:
- *			buf:		C string containing a "-" followed
- *					by a transport name and an unsigned
- *					integer value representing the port
- *					to listen on, separated by whitespace
- *			size:		non-zero length of C string in @buf
- * Output:
- *	On success:	returns zero; NFS service no longer listens
- *			on that transport
- *	On error:	return code is a negative errno value
  */
 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 {

include/linux/sunrpc/svcsock.h

@@ -39,9 +39,6 @@ int		svc_recv(struct svc_rqst *, long);
 int		svc_send(struct svc_rqst *);
 void		svc_drop(struct svc_rqst *);
 void		svc_sock_update_bufs(struct svc_serv *serv);
-int		svc_sock_names(struct svc_serv *serv, char *buf,
-					const size_t buflen,
-					const char *toclose);
 int		svc_addsock(struct svc_serv *serv, const int fd,
 					char *name_return, const size_t len);
 void		svc_init_xprt_sock(void);

net/sunrpc/svcsock.c

@@ -305,57 +305,6 @@ static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
 	return len;
 }
 
-/**
- * svc_sock_names - construct a list of listener names in a string
- * @serv: pointer to RPC service
- * @buf: pointer to a buffer to fill in with socket names
- * @buflen: size of the buffer to be filled
- * @toclose: pointer to '\0'-terminated C string containing the name
- *		of a listener to be closed
- *
- * Fills in @buf with a '\n'-separated list of names of listener
- * sockets.  If @toclose is not NULL, the socket named by @toclose
- * is closed, and is not included in the output list.
- *
- * Returns positive length of the socket name string, or a negative
- * errno value on error.
- */
-int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
-		   const char *toclose)
-{
-	struct svc_sock *svsk, *closesk = NULL;
-	int len = 0;
-
-	if (!serv)
-		return 0;
-
-	spin_lock_bh(&serv->sv_lock);
-	list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
-		int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
-		if (onelen < 0) {
-			len = onelen;
-			break;
-		}
-		if (toclose && strcmp(toclose, buf + len) == 0) {
-			closesk = svsk;
-			svc_xprt_get(&closesk->sk_xprt);
-		} else
-			len += onelen;
-	}
-	spin_unlock_bh(&serv->sv_lock);
-
-	if (closesk) {
-		/* Should unregister with portmap, but you cannot
-		 * unregister just one protocol...
-		 */
-		svc_close_xprt(&closesk->sk_xprt);
-		svc_xprt_put(&closesk->sk_xprt);
-	} else if (toclose)
-		return -ENOENT;
-	return len;
-}
-EXPORT_SYMBOL_GPL(svc_sock_names);
-
 /*
  * Check input queue length
  */