From patchwork Mon Jun 17 15:13:48 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 2734291 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 52834C0AB1 for ; Mon, 17 Jun 2013 15:19:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 188A120395 for ; Mon, 17 Jun 2013 15:19:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6018E20388 for ; Mon, 17 Jun 2013 15:19:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751518Ab3FQPTC (ORCPT ); Mon, 17 Jun 2013 11:19:02 -0400 Received: from mx1.redhat.com ([209.132.183.28]:11928 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751982Ab3FQPOc (ORCPT ); Mon, 17 Jun 2013 11:14:32 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r5HFE4RP022754 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 17 Jun 2013 11:14:04 -0400 Received: from sikun.lab.eng.rdu2.redhat.com (sikun.lab.eng.rdu2.redhat.com [10.8.0.43]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r5HFDuWW009391; Mon, 17 Jun 2013 11:14:02 -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 v3 05/13] locks: encapsulate the fl_link list handling Date: Mon, 17 Jun 2013 11:13:48 -0400 Message-Id: <1371482036-15958-6-git-send-email-jlayton@redhat.com> In-Reply-To: <1371482036-15958-1-git-send-email-jlayton@redhat.com> References: <1371482036-15958-1-git-send-email-jlayton@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-8.0 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 c186649..c0e613f 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 *waiter) +{ + list_add_tail(&waiter->fl_link, &file_lock_list); +} + +static inline void +locks_delete_global_locks(struct file_lock *waiter) +{ + list_del_init(&waiter->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);