From patchwork Thu Mar 15 15:52:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 10285017 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AF140602C2 for ; Thu, 15 Mar 2018 16:04:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 98B2028B38 for ; Thu, 15 Mar 2018 16:04:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8BBBC28B45; Thu, 15 Mar 2018 16:04:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 36F2A28AFB for ; Thu, 15 Mar 2018 16:04:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932443AbeCOQBl (ORCPT ); Thu, 15 Mar 2018 12:01:41 -0400 Received: from mga05.intel.com ([192.55.52.43]:22979 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932475AbeCOQBk (ORCPT ); Thu, 15 Mar 2018 12:01:40 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Mar 2018 09:01:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,311,1517904000"; d="scan'208";a="24968992" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by orsmga007.jf.intel.com with ESMTP; 15 Mar 2018 09:01:39 -0700 Subject: [PATCH v6 12/15] xfs: require mmap lock for xfs_break_layouts() From: Dan Williams To: linux-nvdimm@lists.01.org Cc: "Darrick J. Wong" , Ross Zwisler , Dave Chinner , Christoph Hellwig , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, jack@suse.cz, ross.zwisler@linux.intel.com, hch@lst.de, linux-kernel@vger.kernel.org Date: Thu, 15 Mar 2018 08:52:29 -0700 Message-ID: <152112914933.24669.5543317105428477772.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <152112908134.24669.10222746224538377035.stgit@dwillia2-desk3.amr.corp.intel.com> References: <152112908134.24669.10222746224538377035.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In preparation for adding coordination between truncate operations and busy dax-pages, extend xfs_break_layouts() to assume it must be called with the mmap lock held. This locking scheme will be required for coordinating the break of 'dax layouts' (non-idle dax (ZONE_DEVICE) pages mapped into the file's address space). Cc: "Darrick J. Wong" Cc: Ross Zwisler Cc: Dave Chinner Suggested-by: Christoph Hellwig Signed-off-by: Dan Williams --- fs/xfs/xfs_file.c | 14 +++++++++----- fs/xfs/xfs_ioctl.c | 5 +---- fs/xfs/xfs_iops.c | 10 +++++++--- fs/xfs/xfs_pnfs.c | 6 ++++-- 4 files changed, 21 insertions(+), 14 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 9ea08326f876..ba969019bf26 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -350,9 +350,16 @@ xfs_file_aio_write_checks( if (error <= 0) return error; + xfs_ilock(ip, XFS_MMAPLOCK_EXCL); + *iolock |= XFS_MMAPLOCK_EXCL; error = xfs_break_layouts(inode, iolock); - if (error) + if (error) { + *iolock &= ~XFS_MMAPLOCK_EXCL; + xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); return error; + } + xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); + *iolock &= ~XFS_MMAPLOCK_EXCL; /* * For changing security info in file_remove_privs() we need i_rwsem @@ -768,7 +775,7 @@ xfs_file_fallocate( struct xfs_inode *ip = XFS_I(inode); long error; enum xfs_prealloc_flags flags = 0; - uint iolock = XFS_IOLOCK_EXCL; + uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; loff_t new_size = 0; bool do_file_insert = false; @@ -782,9 +789,6 @@ xfs_file_fallocate( if (error) goto out_unlock; - xfs_ilock(ip, XFS_MMAPLOCK_EXCL); - iolock |= XFS_MMAPLOCK_EXCL; - if (mode & FALLOC_FL_PUNCH_HOLE) { error = xfs_free_file_space(ip, offset, len); if (error) diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 89fb1eb80aae..4151fade4bb1 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -614,7 +614,7 @@ xfs_ioc_space( struct xfs_inode *ip = XFS_I(inode); struct iattr iattr; enum xfs_prealloc_flags flags = 0; - uint iolock = XFS_IOLOCK_EXCL; + uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; int error; /* @@ -648,9 +648,6 @@ xfs_ioc_space( if (error) goto out_unlock; - xfs_ilock(ip, XFS_MMAPLOCK_EXCL); - iolock |= XFS_MMAPLOCK_EXCL; - switch (bf->l_whence) { case 0: /*SEEK_SET*/ break; diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 951e84df5576..d23aa08426f9 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1028,13 +1028,17 @@ xfs_vn_setattr( if (iattr->ia_valid & ATTR_SIZE) { struct xfs_inode *ip = XFS_I(d_inode(dentry)); - uint iolock = XFS_IOLOCK_EXCL; + uint iolock; + + xfs_ilock(ip, XFS_MMAPLOCK_EXCL); + iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; error = xfs_break_layouts(d_inode(dentry), &iolock); - if (error) + if (error) { + xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); return error; + } - xfs_ilock(ip, XFS_MMAPLOCK_EXCL); error = xfs_vn_setattr_size(dentry, iattr); xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); } else { diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c index aa6c5c193f45..9fe661c2d59c 100644 --- a/fs/xfs/xfs_pnfs.c +++ b/fs/xfs/xfs_pnfs.c @@ -38,12 +38,14 @@ xfs_break_layouts( struct xfs_inode *ip = XFS_I(inode); int error; - ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)); + ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL + | XFS_MMAPLOCK_EXCL)); while ((error = break_layout(inode, false) == -EWOULDBLOCK)) { xfs_iunlock(ip, *iolock); error = break_layout(inode, true); - *iolock = XFS_IOLOCK_EXCL; + *iolock &= ~XFS_IOLOCK_SHARED; + *iolock |= XFS_IOLOCK_EXCL; xfs_ilock(ip, *iolock); }