From patchwork Wed Aug 15 23:43:00 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "J. Bruce Fields" X-Patchwork-Id: 1328941 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 770ABDFFED for ; Wed, 15 Aug 2012 23:43:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753642Ab2HOXnD (ORCPT ); Wed, 15 Aug 2012 19:43:03 -0400 Received: from fieldses.org ([174.143.236.118]:50047 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753008Ab2HOXnC (ORCPT ); Wed, 15 Aug 2012 19:43:02 -0400 Received: from bfields by fieldses.org with local (Exim 4.72) (envelope-from ) id 1T1nEq-0007kK-IX for linux-nfs@vger.kernel.org; Wed, 15 Aug 2012 19:43:00 -0400 Date: Wed, 15 Aug 2012 19:43:00 -0400 To: linux-nfs@vger.kernel.org Subject: [PATCH] nfsd: remove unused listener-removal interfaces Message-ID: <20120815234259.GB28054@fieldses.org> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.20 (2009-06-14) From: "J. Bruce Fields" Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: "J. Bruce Fields" 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 a217813f9067b785241cb7f31956e51d2071703a "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. Signed-off-by: J. Bruce Fields Acked-by: NeilBrown --- fs/nfsd/nfsctl.c | 78 ---------------------------------------- include/linux/sunrpc/svcsock.h | 3 -- net/sunrpc/svcsock.c | 51 -------------------------- 3 files changed, 132 deletions(-) OK, maybe this is somewhat of a troll patch--but I don't actually know how to fix this interface, so: do we really have a use for it? --b. diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index e41a08ff..dab350d 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -683,25 +683,6 @@ static ssize_t __write_ports_addfd(char *buf) } /* - * 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 @@ out_err: 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) { diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h index cb4ac69..92ad02f 100644 --- a/include/linux/sunrpc/svcsock.h +++ b/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); diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index c7a7b14..42fedbd 100644 --- a/net/sunrpc/svcsock.c +++ b/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 */