From patchwork Fri Jun 21 12:58:14 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 2762671 Return-Path: X-Original-To: patchwork-cifs-client@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 148799F756 for ; Fri, 21 Jun 2013 13:03:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 674E820242 for ; Fri, 21 Jun 2013 13:03:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 799E120250 for ; Fri, 21 Jun 2013 13:03:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965920Ab3FUM66 (ORCPT ); Fri, 21 Jun 2013 08:58:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:17223 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965835Ab3FUM6z (ORCPT ); Fri, 21 Jun 2013 08:58:55 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r5LCwUT3016690 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 21 Jun 2013 08:58:30 -0400 Received: from sikun.lab.eng.rdu2.redhat.com (sikun.lab.eng.rdu2.redhat.com [10.8.0.43]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r5LCwMig014591; Fri, 21 Jun 2013 08:58:29 -0400 From: Jeff Layton To: viro@zeniv.linux.org.uk, matthew@wil.cx, bfields@fieldses.org Cc: dhowells@redhat.com, sage@inktank.com, smfrench@gmail.com, swhiteho@redhat.com, Trond.Myklebust@netapp.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, piastryyy@gmail.com Subject: [PATCH v4 06/14] locks: encapsulate the fl_link list handling Date: Fri, 21 Jun 2013 08:58:14 -0400 Message-Id: <1371819502-26363-7-git-send-email-jlayton@redhat.com> In-Reply-To: <1371819502-26363-1-git-send-email-jlayton@redhat.com> References: <1371819502-26363-1-git-send-email-jlayton@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Spam-Status: No, score=-8.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Move the fl_link list handling routines into a separate set of helpers. Also ensure that locks and requests are always put on global lists last (after fully initializing them) and are taken off before unintializing them. Signed-off-by: Jeff Layton --- fs/locks.c | 45 ++++++++++++++++++++++++++++++++++++--------- 1 files changed, 36 insertions(+), 9 deletions(-) diff --git a/fs/locks.c b/fs/locks.c index 1d6cb28..89d898b 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -153,13 +153,15 @@ int lease_break_time = 45; #define for_each_lock(inode, lockp) \ for (lockp = &inode->i_flock; *lockp != NULL; lockp = &(*lockp)->fl_next) +/* The global file_lock_list is only used for displaying /proc/locks. */ static LIST_HEAD(file_lock_list); + +/* The blocked_list is used to find POSIX lock loops for deadlock detection. */ static LIST_HEAD(blocked_list); + +/* Protects the two list heads above, plus the inode->i_flock list */ static DEFINE_SPINLOCK(file_lock_lock); -/* - * Protects the two list heads above, plus the inode->i_flock list - */ void lock_flocks(void) { spin_lock(&file_lock_lock); @@ -484,13 +486,37 @@ static int posix_same_owner(struct file_lock *fl1, struct file_lock *fl2) return fl1->fl_owner == fl2->fl_owner; } +static inline void +locks_insert_global_locks(struct file_lock *fl) +{ + list_add_tail(&fl->fl_link, &file_lock_list); +} + +static inline void +locks_delete_global_locks(struct file_lock *fl) +{ + list_del_init(&fl->fl_link); +} + +static inline void +locks_insert_global_blocked(struct file_lock *waiter) +{ + list_add(&waiter->fl_link, &blocked_list); +} + +static inline void +locks_delete_global_blocked(struct file_lock *waiter) +{ + list_del_init(&waiter->fl_link); +} + /* Remove waiter from blocker's block list. * When blocker ends up pointing to itself then the list is empty. */ static void __locks_delete_block(struct file_lock *waiter) { + locks_delete_global_blocked(waiter); list_del_init(&waiter->fl_block); - list_del_init(&waiter->fl_link); waiter->fl_next = NULL; } @@ -512,10 +538,10 @@ static void locks_insert_block(struct file_lock *blocker, struct file_lock *waiter) { BUG_ON(!list_empty(&waiter->fl_block)); - list_add_tail(&waiter->fl_block, &blocker->fl_block); waiter->fl_next = blocker; + list_add_tail(&waiter->fl_block, &blocker->fl_block); if (IS_POSIX(blocker)) - list_add(&waiter->fl_link, &blocked_list); + locks_insert_global_blocked(request); } /* @@ -543,13 +569,13 @@ static void locks_wake_up_blocks(struct file_lock *blocker) */ static void locks_insert_lock(struct file_lock **pos, struct file_lock *fl) { - list_add(&fl->fl_link, &file_lock_list); - fl->fl_nspid = get_pid(task_tgid(current)); /* insert into file's list */ fl->fl_next = *pos; *pos = fl; + + locks_insert_global_locks(fl); } /* @@ -562,9 +588,10 @@ static void locks_delete_lock(struct file_lock **thisfl_p) { struct file_lock *fl = *thisfl_p; + locks_delete_global_locks(fl); + *thisfl_p = fl->fl_next; fl->fl_next = NULL; - list_del_init(&fl->fl_link); if (fl->fl_nspid) { put_pid(fl->fl_nspid);