From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EED9C4363D for ; Tue, 6 Oct 2020 04:16:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F4CC208B6 for ; Tue, 6 Oct 2020 04:16:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="t0ovOeEz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725882AbgJFEQU (ORCPT ); Tue, 6 Oct 2020 00:16:20 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:46074 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725874AbgJFEQU (ORCPT ); Tue, 6 Oct 2020 00:16:20 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0964EL1F133171; Tue, 6 Oct 2020 04:16:18 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2020-01-29; bh=MW9u6zpkS/t1MgLpe9daXqW0LRjIGJuteYukMbd+oOc=; b=t0ovOeEz/+cYuqXdiRbFFFECd0K1N/h1xhqWr2UkF3K7Hd4wJQlL3rwMpt+ckT2gj8bb xA+RxqvV4mre7oZGXEmpn7C2ogFR9uB/8/nRcoO15VLN3vWi23uR/gtXEoI661KZV3lD ryl2af1dfmqREPp2gcRCKblSYO9Hgv9KKvxfgflrne51kBnfY/udFqkQ7dW1vE338VAd q9/uaC5pJfJwUYgPIcxS6xla6nnqrSDJ2bkf7G+u66lJRD2zCRW3bQDuRNZI3AFRKnAI DmaDrW0nXMUkIaSGe+DcjyIrpF3z0SRRqhp8jqYuN+yCnQGXCl9CuUYch5zy0xxvf1Bt lA== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2120.oracle.com with ESMTP id 33ym34eup9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 06 Oct 2020 04:16:18 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0964B7if163215; Tue, 6 Oct 2020 04:16:17 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 33yyjewxty-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 06 Oct 2020 04:16:17 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0964GGXJ014555; Tue, 6 Oct 2020 04:16:16 GMT Received: from localhost (/67.169.218.210) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 05 Oct 2020 21:16:16 -0700 Date: Mon, 5 Oct 2020 21:16:14 -0700 From: "Darrick J. Wong" To: Pavel Reichl Cc: linux-xfs@vger.kernel.org Subject: Re: [PATCH v8 1/4] xfs: Refactor xfs_isilocked() Message-ID: <20201006041614.GI49547@magnolia> References: <20201005213852.233004-1-preichl@redhat.com> <20201005213852.233004-2-preichl@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201005213852.233004-2-preichl@redhat.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9765 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 adultscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010060023 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9765 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 impostorscore=0 priorityscore=1501 mlxscore=0 mlxlogscore=999 clxscore=1015 bulkscore=0 spamscore=0 malwarescore=0 phishscore=0 suspectscore=1 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010060023 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Mon, Oct 05, 2020 at 11:38:49PM +0200, Pavel Reichl wrote: > Refactor xfs_isilocked() to use newly introduced __xfs_rwsem_islocked(). > __xfs_rwsem_islocked() is a helper function which encapsulates checking > state of rw_semaphores hold by inode. > > Signed-off-by: Pavel Reichl > Suggested-by: Dave Chinner > Suggested-by: Eric Sandeen > Suggested-by: Darrick J. Wong > --- > fs/xfs/xfs_inode.c | 62 ++++++++++++++++++++++++++++++++++------------ > fs/xfs/xfs_inode.h | 21 ++++++++++------ > 2 files changed, 60 insertions(+), 23 deletions(-) > > diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c > index c06129cffba9..1f39bce96656 100644 > --- a/fs/xfs/xfs_inode.c > +++ b/fs/xfs/xfs_inode.c > @@ -345,32 +345,62 @@ xfs_ilock_demote( > } > > #if defined(DEBUG) || defined(XFS_WARN) > -int > +static inline bool > +__xfs_rwsem_islocked( > + struct rw_semaphore *rwsem, > + int lock_flags) > +{ > + int arg; This ought ^^^^ to be indented ^^ to there. Otherwise this patch looks ok to me from what I vaguely remember from the last revision. > + > + if (!debug_locks) > + return rwsem_is_locked(rwsem); > + > + if (lock_flags & (1 << XFS_SHARED_LOCK_SHIFT)) { > + /* > + * The caller could be asking if we have (shared | excl) > + * access to the lock. Ask lockdep if the rwsem is > + * locked either for read or write access. > + * > + * The caller could also be asking if we have only > + * shared access to the lock. Holding a rwsem > + * write-locked implies read access as well, so the > + * request to lockdep is the same for this case. > + */ > + arg = -1; > + } else { > + /* > + * The caller is asking if we have only exclusive access > + * to the lock. Ask lockdep if the rwsem is locked for > + * write access. Oh, also I appreciate the comment that documents why we're picking these seemingly magic numbers. --D > + */ > + arg = 0; > + } > + > + return lockdep_is_held_type(rwsem, arg); > +} > + > +bool > xfs_isilocked( > - xfs_inode_t *ip, > + struct xfs_inode *ip, > uint lock_flags) > { > - if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { > - if (!(lock_flags & XFS_ILOCK_SHARED)) > - return !!ip->i_lock.mr_writer; > - return rwsem_is_locked(&ip->i_lock.mr_lock); > + if (lock_flags & (XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)) { > + return __xfs_rwsem_islocked(&ip->i_lock, > + (lock_flags >> XFS_ILOCK_FLAG_SHIFT)); > } > > - if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) { > - if (!(lock_flags & XFS_MMAPLOCK_SHARED)) > - return !!ip->i_mmaplock.mr_writer; > - return rwsem_is_locked(&ip->i_mmaplock.mr_lock); > + if (lock_flags & (XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)) { > + return __xfs_rwsem_islocked(&ip->i_mmaplock, > + (lock_flags >> XFS_MMAPLOCK_FLAG_SHIFT)); > } > > - if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { > - if (!(lock_flags & XFS_IOLOCK_SHARED)) > - return !debug_locks || > - lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0); > - return rwsem_is_locked(&VFS_I(ip)->i_rwsem); > + if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) { > + return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem, > + (lock_flags >> XFS_IOLOCK_FLAG_SHIFT)); > } > > ASSERT(0); > - return 0; > + return false; > } > #endif > > diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h > index e9a8bb184d1f..77d5655191ab 100644 > --- a/fs/xfs/xfs_inode.h > +++ b/fs/xfs/xfs_inode.h > @@ -268,12 +268,19 @@ static inline void xfs_ifunlock(struct xfs_inode *ip) > * Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield) > * 1<<16 - 1<<32-1 -- lockdep annotation (integers) > */ > -#define XFS_IOLOCK_EXCL (1<<0) > -#define XFS_IOLOCK_SHARED (1<<1) > -#define XFS_ILOCK_EXCL (1<<2) > -#define XFS_ILOCK_SHARED (1<<3) > -#define XFS_MMAPLOCK_EXCL (1<<4) > -#define XFS_MMAPLOCK_SHARED (1<<5) > + > +#define XFS_IOLOCK_FLAG_SHIFT 0 > +#define XFS_ILOCK_FLAG_SHIFT 2 > +#define XFS_MMAPLOCK_FLAG_SHIFT 4 > + > +#define XFS_SHARED_LOCK_SHIFT 1 > + > +#define XFS_IOLOCK_EXCL (1 << (XFS_IOLOCK_FLAG_SHIFT)) > +#define XFS_IOLOCK_SHARED (XFS_IOLOCK_EXCL << (XFS_SHARED_LOCK_SHIFT)) > +#define XFS_ILOCK_EXCL (1 << (XFS_ILOCK_FLAG_SHIFT)) > +#define XFS_ILOCK_SHARED (XFS_ILOCK_EXCL << (XFS_SHARED_LOCK_SHIFT)) > +#define XFS_MMAPLOCK_EXCL (1 << (XFS_MMAPLOCK_FLAG_SHIFT)) > +#define XFS_MMAPLOCK_SHARED (XFS_MMAPLOCK_EXCL << (XFS_SHARED_LOCK_SHIFT)) > > #define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \ > | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \ > @@ -412,7 +419,7 @@ void xfs_ilock(xfs_inode_t *, uint); > int xfs_ilock_nowait(xfs_inode_t *, uint); > void xfs_iunlock(xfs_inode_t *, uint); > void xfs_ilock_demote(xfs_inode_t *, uint); > -int xfs_isilocked(xfs_inode_t *, uint); > +bool xfs_isilocked(xfs_inode_t *, uint); > uint xfs_ilock_data_map_shared(struct xfs_inode *); > uint xfs_ilock_attr_map_shared(struct xfs_inode *); > > -- > 2.26.2 >